/*
** 2001-09-15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
*/
static const char zHelp[] =
"Althttpd is a small, simple, stand-alone HTTP server.\n"
"\n"
"Features:\n"
"\n"
" * Launched from inetd/xinetd/systemd, or as a stand-alone server\n"
" * One process per TCP/IP connection\n"
" * Deliver static content or run CGI or SCGI\n"
" * Virtual sites based on the 'Host:' property of the HTTP header\n"
" * Runs in a chroot jail\n"
" * Unified log file in a CSV format\n"
" * Small code base (this 1 file) to facilitate security auditing\n"
" * Simple setup - no configuration files to misconfigure\n"
"\n"
"This file implements a small and simple but secure and effective web\n"
"server. There are no frills. Anything that could be reasonably\n"
"omitted has been.\n"
"\n"
"Setup rules:\n"
"\n"
" (1) Launch as root from inetd/systemd like this:\n"
"\n"
" althttpd -logfile logfile -root /home/www -user nobody\n"
"\n"
" It will automatically chroot to /home/www and become user\n"
" \"nobody\". The logfile name should be relative to the chroot jail.\n"
"\n"
" (2) Directories of the form '*.website' (ex: www_sqlite_org.website)\n"
" contain content. The directory is chosen based on the HTTP_HOST\n"
" request header. If there is no HTTP_HOST header or if the\n"
" corresponding host directory does not exist, then the\n"
" 'default.website' is used.\n"
"\n"
" In stand-alone mode (when the --port, --page, or --popup options are\n"
" used) if neither the HTTP_HOST.website nor 'default.website'\n"
" directories exist, then files are served directly from the \n"
" directory from which althttpd was launched. This makes it easy\n"
" to run a quick web-server for testing purposes using commands like:\n"
"\n"
" althttpd --page fiddle.html\n"
" althttpd --popup\n"
" althttpd --port 8080..8090\n"
"\n"
" In one-connection mode (when launched from xinetd or similar)\n"
" an error is raised if 'default.website' does not exist.\n"
"\n"
" If the HTTP_HOST header contains any charaters other than\n"
" [a-zA-Z0-9_.,*~/] then a 403 error is generated.\n"
"\n"
" (3) Any file or directory whose name begins with '.' or '-' is ignored,\n"
" except if the URL begins with '/.well-known/' then initial '.' and\n"
" '-' characters are allowed, but not initial '..'. The exception is\n"
" for RFC-5785 to allow letsencrypt or certbot to generate a TLS cert\n"
" using webroot.\n"
"\n"
" (4) Characters other than [0-9a-zA-Z,-./:_~] and any %HH characters\n"
" escapes in the filename are all translated into '_'. This is\n"
" a defense against cross-site scripting attacks and other mischief.\n"
"\n"
" (5) Executable files are run as CGI. Files whose name ends with '.scgi'\n"
" trigger an SCGI request (see item 9 below). All other files\n"
" are delivered as is.\n"
"\n"
" (6) If a file named '-auth' exists in the same directory as the file to\n"
" be run as CGI/SCGI or to be delivered, then it contains information\n"
" for HTTP Basic authorization. See file format details below.\n"
"\n"
" (7) To run as a stand-alone server, simply add the '-port N' command-line\n"
" option to define which TCP port to listen on. If the argument is\n"
" '--port N1..N2' then TCP ports between N1 and N2 are scanned looking\n"
" for one that is open and the first open port is used.\n"
"\n"
" (8) For static content, the mimetype is determined by the file suffix\n"
" using a table built into the source code below. If you have\n"
" unusual content files, you might need to extend this table.\n"
"\n"
" (9) Content files that end with '.scgi' and that contain text of the\n"
" form 'SCGI hostname port' will format an SCGI request and send it\n"
" to hostname:port, then relay back the reply. Error behavior is\n"
" determined by subsequent lines of the .scgi file. See SCGI below\n"
" for details.\n"
"\n"
" (10) If compiled with -DENABLE_TLS and linked against OpenSSL and\n"
" launched with a --cert option to identify a certificate file, then\n"
" TLS is used to encrypt the connection.\n"
"\n"
" (11) When requesting static file NAME and if the HTTP request includes\n"
" 'Accept-Encoding: gzip' and if file 'NAME.gz' exists on disk, then\n"
" return NAME.gz with an 'Content-encoding: gzip' header\n"
"\n"
"Command-line Options:\n"
"\n"
" --root DIR Defines the directory that contains the various\n"
" $HOST.website subdirectories, each containing web content\n"
" for a single virtual host. If launched as root and if\n"
" '--user USER' also appears on the command-line and if\n"
" '--jail 0' is omitted, then the process runs in a chroot\n"
" jail rooted at this directory and under the userid USER.\n"
" This option is required for xinetd launch but defaults\n"
" to '.' for a stand-alone web server. DIR should always\n"
" be an absolute path, else child processes might misbehave.\n"
"\n"
" --port N Run in standalone mode listening on TCP port N, or from\n"
" --port N1..N2 the first available TCP port in the range from N1 to N2.\n"
"\n"
#ifdef ENABLE_TLS
" --tls-port M If used in combination with --port N, the althttpd listens\n"
" for incoming TLS connections on TCP port M (usually 443)\n"
" and for ordinary unencrypted HTTP requests or port N\n"
" (usually 80). If both --port and --tls-port are specified\n"
" but the --cert does not exist, then the --tls-port is\n"
" silently ignored and the server operates non-TLS only.\n"
"\n"
#endif /* ENABLE_TLS */
" --user USER Define the user under which the process should run if\n"
" originally launched as root. If this option is omitted,\n"
" then the user and group of the owner of the --root\n"
" directory is used. The althttpd process will always drop\n"
" root privileges or else abort with an error, before\n"
" reading a single byte of HTTP request content.\n"
"\n"
" --logfile FILE Append a single-line, CSV-format, log file entry to FILE\n"
" for each HTTP request. FILE should be a full pathname.\n"
" The FILE name is interpreted inside the chroot jail. The\n"
" FILE name is expanded using strftime() if it contains\n"
" at least one '%' and is not too long.\n"
"\n"
#ifdef ENABLE_TLS
" --cert FILE The TLS certificate, the 'fullchain.pem' file.\n"
"\n"
" --pkey FILE The TLS private key, the 'privkey.pem' file. May be\n"
" omitted if the --cert file is the concatenation of\n"
" the fullchain.pem and the privkey.pem.\n"
"\n"
" --certdir DIR This is shorthand for the common case of a Let's Encrypt\n"
" cert held in DIR. It means the same as:\n"
" \"--cert DIR/fullchain.pem --pkey DIR/privkey.pem\"\n"
"\n"
#endif /* ENABLE_TLS */
" --ipshun DIR If the remote IP address is also the name of a file\n"
" in DIR that has size N bytes and where either N is zero\n"
" or the m-time of the file is less than N time-units ago\n"
" then that IP address is being shunned and no requests\n"
" are processed. The time-unit is a compile-time option\n"
" (BANISH_TIME) that defaults to 300 seconds. If this\n"
" happens, the client gets a 503 Service Unavailable\n"
" reply. Furthermore, althttpd will create ip-shunning\n"
" files following a 404 Not Found error if the request\n"
" URI is an obvious hack attempt. The ip-shunning file\n"
" will also be created if a CGI returns status code 418.\n"
"\n"
" --https BOOLEAN Indicates that input is coming over SSL and is being\n"
" decoded upstream, perhaps by stunnel. This option\n"
" does *not* activate built-in TLS support. Use --cert\n"
" for that.\n"
"\n"
" --page NAME Come up in stand-alone mode, and then try to launch a\n"
" web-browser pointing to the NAME document after the\n"
" listening socket has been created. This option\n"
" implies --loopback and '--port 8080..8100'.\n"
"\n"
" --popup Launch a stand-alone web server to use for testing.\n"
" This option implies '--port 8080..8100'. This option\n"
" is similar to '--page NAME' except that it does not\n"
" try to launch a web-browser and does not force the\n"
" connection into --loopback mode. Use this when\n"
" running a test web-server on a remote host via ssh.\n"
"\n"
" --loopback Only accept loop-back TCP connections (connections\n"
" originating from the same host). This is the\n"
" default if --root is omitted.\n"
"\n"
" --jail BOOLEAN Indicates whether or not to form a chroot jail if\n"
" initially run as root. The default is true, so the only\n"
" useful variant of this option is '--jail 0' which prevents\n"
" the formation of the chroot jail.\n"
"\n"
" --max-child N Do not run more than N child processes at once in\n"
" standalone-mode (when althttpd is itself listening for\n"
" incoming connections and starting a new child process to\n"
" deal with each connection).\n"
"\n"
" --max-age SEC The value for 'Cache-Control: max-age=%d'. Defaults to\n"
" 120 seconds.\n"
"\n"
" --max-cpu SEC Maximum number of seconds of CPU time allowed per\n"
" HTTP connection. Default 30 (build option:\n"
" -DMAX_CPU=integer). 0 means no limit.\n"
"\n"
" --debug BOOLEAN Disables input timeouts. This is useful for debugging\n"
" when inputs are being typed in manually.\n"
"\n"
" --enable-sab Add new lines to the HTTP reply header that are\n"
" prerequisites for SharedArrayBuffer. These are the lines:\n"
" Cross-Origin-Embedder-Policy: require-corp\n"
" Cross-Origin-Opener-Policy: same-origin\n"
"\n"
"\n"
"Command-line options can take either one or two initial '-' characters.\n"
"So '--debug' and '-debug' mean the same thing, for example.\n"
"\n"
"\n"
"Security Features:\n"
"\n"
"(1) This program automatically puts itself inside a chroot jail if\n"
" it can and if not specifically prohibited by the '--jail 0'\n"
" command-line option. The root of the jail is the directory that\n"
" contains the various $HOST.website content subdirectories.\n"
"\n"
"(2) No input is read while this process has root privileges. Root\n"
" privileges are dropped prior to reading any input (but after entering\n"
" the chroot jail, of course). If root privileges cannot be dropped\n"
" (for example because the --user command-line option was omitted or\n"
" because the user specified by the --user option does not exist),\n"
" then the process aborts with an error prior to reading any input.\n"
"\n"
"(3) The length of an HTTP request is limited to MAX_CONTENT_LENGTH bytes\n"
" (default: 250 million). Any HTTP request longer than this fails\n"
" with an error. (Build option: -DMAX_CONTENT_LENGTH=integer)\n"
"\n"
"(4) There are hard-coded time-outs on each HTTP request. If this process\n"
" waits longer than the timeout for the complete request, or for CGI\n"
" to finish running, then this process aborts. (The timeout feature\n"
" can be disabled using the --debug command-line option.)\n"
"\n"
"(5) If the HTTP_HOST request header contains characters other than\n"
" [0-9a-zA-Z,-./:_~] then the entire request is rejected.\n"
"\n"
"(6) Any characters in the URI pathname other than [0-9a-zA-Z,-./:_~]\n"
" are converted into '_'. This applies to the pathname only, not\n"
" to the query parameters or fragment.\n"
"\n"
"(7) If the first character of any URI pathname component is '.' or '-'\n"
" then a 404 Not Found reply is generated. This prevents attacks\n"
" such as including '..' or '.' directory elements in the pathname\n"
" and allows placing files and directories in the content subdirectory\n"
" that are invisible to all HTTP requests, by making the first\n"
" character of the file or subdirectory name '-' or '.'.\n"
"\n"
"(8) The request URI must begin with '/' or else a 404 error is generated.\n"
"\n"
"(9) This program never sets the value of an environment variable to a\n"
" string that begins with '() {'.\n"
"\n"
"(10) If the --ipshun option is used, specific IP addresses can be\n"
" temporarily block for abusive behavior.\n"
"\n"
"(11) If a CGI reports status code 418 (\"I'm a teapot\", rfc2324) and if\n"
" the --ipshun option is used, then the IP address is temporarily\n"
" blocked.\n"
"\n"
"Security Auditing:\n"
"\n"
"This webserver mostly only serves static content. Any security risk will\n"
"come from CGI and SCGI. To check an installation for security, then, it\n"
"makes sense to focus on the CGI and SCGI scripts.\n"
"\n"
"To locate all CGI files:\n"
"\n"
" find *.website -executable -type f -print\n"
" OR: find *.website -perm +0111 -type f -print\n"
"\n"
"The first form of the 'find' command is preferred, but is only supported\n"
"by GNU find. On a Mac, you'll have to use the second form.\n"
"\n"
"To find all SCGI files:\n"
"\n"
" find *.website -name '*.scgi' -type f -print\n"
"\n"
"If any file is a security concern, it can be disabled on a live\n"
"installation by turning off read permissions:\n"
"\n"
" chmod 0000 file-of-concern\n"
"\n"
"SCGI Specification Files:\n"
"\n"
"Content files (files without the execute bit set) that end with '.scgi'\n"
"specify a connection to an SCGI server. The format of the .scgi file\n"
"follows this template:\n"
"\n"
" SCGI hostname port\n"
" fallback: fallback-filename\n"
" relight: relight-command\n"
"\n"
"The first line specifies the location and TCP/IP port of the SCGI\n"
"server that will handle the request. Subsequent lines determine\n"
"what to do if the SCGI server cannot be contacted. If the\n"
"'relight:' line is present, then the relight-command is run using\n"
"system() and the connection is retried after a 1-second delay. Use\n"
"'&' at the end of the relight-command to run it in the background.\n"
"Make sure the relight-command does not generate output, or that\n"
"output will become part of the SCGI reply. Add a '>/dev/null'\n"
"suffix (before the '&') to the relight-command if necessary to\n"
"suppress output. If there is no relight-command, or if the relight\n"
"is attempted but the SCGI server still cannot be contacted, then\n"
"the content of the fallback-filename file is returned as a\n"
"substitute for the SCGI request. The mimetype is determined by the\n"
"suffix on the fallback-filename. The fallback-filename would\n"
"typically be an error message indicating that the service is\n"
"temporarily unavailable.\n"
"\n"
"Basic Authorization:\n"
"\n"
"If the file '-auth' exists in the same directory as the content file\n"
"(for both static content and CGI) then it contains the information used\n"
"for basic authorization. The file format is as follows:\n"
"\n"
" * Blank lines and lines that begin with '#' are ignored\n"
" * 'http-redirect' forces a redirect to HTTPS if not there already\n"
" * 'https-only' disallows operation in HTTP\n"
" * 'user NAME LOGIN:PASSWORD' checks to see if LOGIN:PASSWORD\n"
" authorization credentials are provided, and if so sets the\n"
" REMOTE_USER to NAME.\n"
" * 'realm TEXT' sets the realm to TEXT.\n"
"\n"
"There can be multiple 'user' lines. If no 'user' line matches, the\n"
"request fails with a 401 error.\n"
"\n"
"Because of security rule (7), there is no way for the content of the '-auth'\n"
"file to leak out via HTTP request.\n"
; /* End of help */
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <pwd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdarg.h>
#include <time.h>
#include <sys/times.h>
#include <netdb.h>
#include <errno.h>
#include <sys/resource.h>
#include <signal.h>
#include <dirent.h>
#ifdef linux
#include <sys/sendfile.h>
#endif
#include <assert.h>
#include "VERSION.h"
/*
** Configure the server by setting the following macros and recompiling.
*/
#ifndef DEFAULT_PORT
#define DEFAULT_PORT "80" /* Default TCP port for HTTP */
#endif
#ifndef MAX_CONTENT_LENGTH
#define MAX_CONTENT_LENGTH 250000000 /* Max length of HTTP request content */
#endif
#ifndef MAX_CPU
#define MAX_CPU 30 /* Max CPU cycles in seconds */
#endif
#ifndef BANISH_TIME
#define BANISH_TIME 300 /* How long to banish for abuse (sec) */
#endif
#ifndef SERVER_SOFTWARE
# define SERVER_SOFTWARE "althttpd " RELEASE_VERSION " " MANIFEST_ISODATE
#endif
#ifndef SERVER_SOFTWARE_TLS
# ifdef ENABLE_TLS
# define SERVER_SOFTWARE_TLS SERVER_SOFTWARE ", " OPENSSL_VERSION_TEXT
# else
# define SERVER_SOFTWARE_TLS SERVER_SOFTWARE
# endif
#endif
/*
** Clock ID to use for clock_gettime(), for use in collecting the
** wall-clock processing time using clock_gettime() (which is
** signal-safe). We use clock_gettime(), rather than gmtime(), for
** measuring request wall-clock time because it's signal-safe.
** See discussion at:
** https://sqlite.org/althttpd/forumpost/4dc31619341ce947
*/
#ifdef _POSIX_MONOTONIC_CLOCK
# define ALTHTTPD_CLOCK_ID CLOCK_MONOTONIC
#else
# define ALTHTTPD_CLOCK_ID CLOCK_REALTIME
/* noting that this can jump if the system time changes */
#endif
/*
** Althttpd normally only sends a \n, not a full \r\n, for line endings
** even on protocols that specifically require \r\n (HTTP, SMTP, etc.)
** This is in rebellion to the silliness that is \r\n. Everybody
** understands a bare \n. Fossil deliberately violates the spec in an
** attempt to promote change.
**
** If you prefer to follow the protocol exactly, compile with -DSEND_CR=1
**
** UPDATE: Feedback from the internet suggests that the world is not yet
** ready for a CRLF-less web server. Alas. I'll make it so that CRLF
** is on by default, but you can still generate a CRLF-less webserver by
** recompiling with -DSEND_CR=0.
*/
#if !defined(SEND_CR) || SEND_CR+0>=1
/* This case for strict compliance */
# define CRLF "\r\n"
#else
/* Default: Send only \n */
# define CRLF "\n"
#endif
/*
** We record most of the state information as global variables. This
** saves having to pass information to subroutines as parameters, and
** makes the executable smaller...
*/
static const char *zRoot = 0; /* Root directory of the website */
static char *zPostData= 0; /* POST data */
static int nPostData = 0; /* Number of bytes of POST data */
static char *zProtocol = 0; /* The protocol being using by the browser */
static char *zMethod = 0; /* The method. Must be GET */
static char *zScript = 0; /* The object to retrieve */
static char *zRealScript = 0; /* The object to retrieve. Same as zScript
** except might have "/index.html" appended */
static char *zRequestUri = 0; /* Sanitized request uri */
static char *zHome = 0; /* The directory containing content */
static char *zQueryString = 0; /* The query string on the end of the name */
static char *zFile = 0; /* The filename of the object to retrieve */
static int lenFile = 0; /* Length of the zFile name */
static char *zDir = 0; /* Name of the directory holding zFile */
static char *zPathInfo = 0; /* Part of the pathname past the file */
static char *zAgent = 0; /* What type if browser is making this query */
static char *zServerName = 0; /* The name after the http:// */
static char *zServerPort = 0; /* The port number */
static char *zServerSoftware = 0;/* Software name and version info */
static char *zCookie = 0; /* Cookies reported with the request */
static char *zHttpHost = 0; /* Name according to the web browser */
static char *zRealPort = 0; /* The real TCP port when running as daemon */
static char *zRealTlsPort = 0; /* The real TLS TCP port for a daemon */
static char *zRemoteAddr = 0; /* IP address of the request */
static char *zReferer = 0; /* Name of the page that refered to us */
static char *zAccept = 0; /* What formats will be accepted */
static char *zAcceptEncoding =0; /* gzip or default */
static char *zContentLength = 0; /* Content length reported in the header */
static char *zContentType = 0; /* Content type reported in the header */
static char *zQuerySuffix = 0; /* The part of the URL after the first ? */
static char *zAuthType = 0; /* Authorization type (basic or digest) */
static char *zAuthArg = 0; /* Authorization values */
static char *zRemoteUser = 0; /* REMOTE_USER set by authorization module */
static char *zIfNoneMatch= 0; /* The If-None-Match header value */
static char *zIfModifiedSince=0; /* The If-Modified-Since header value */
static char *zHttpScheme = "http";/* HTTP_SCHEME CGI variable */
static char *zHttps = 0; /* HTTPS CGI variable */
static int nIn = 0; /* Number of bytes of input */
static int nOut = 0; /* Number of bytes of output */
static char zReplyStatus[4]; /* Reply status code */
static int statusSent = 0; /* True after status line is sent */
static const char *zLogFile = 0; /* Log to this file */
static char zExpLogFile[500] = {0}; /* %-expanded log file name */
static const char *zIPShunDir=0; /* Directory containing hostile IP addresses */
static int debugFlag = 0; /* True if being debugged */
static struct timeval beginTime; /* Time when this process starts */
static struct timespec tsBeginTime; /* clock_gettime() when request processing starts */
static int closeConnection = 0; /* True to send Connection: close in reply */
static int nRequest = 0; /* Number of requests processed */
static int omitLog = 0; /* Do not make logfile entries if true */
static int useHttps = 0; /* 0=HTTP, 1=external HTTPS (stunnel),
** 2=builtin TLS support */
static int useTimeout = 1; /* True to use times */
static int nTimeoutLine = 0; /* Line number where timeout was set */
static int standalone = 0; /* Run as a standalone server (no inetd) */
static struct rusage priorSelf; /* Previously report SELF time */
static struct rusage priorChild; /* Previously report CHILD time */
/*static struct timespec tsSelf;*/
static int mxAge = 120; /* Cache-control max-age */
static char *default_path = "/bin:/usr/bin"; /* Default PATH variable */
static char *zScgi = 0; /* Value of the SCGI env variable */
static int rangeStart = 0; /* Start of a Range: request */
static int rangeEnd = 0; /* End of a Range: request */
static int maxCpu = MAX_CPU; /* Maximum CPU time per process */
static int enableSAB = 0; /* Add reply header to enable
** SharedArrayBuffer */
static int inSignalHandler = 0; /* True if running a signal handler */
static int isExiting = 0; /* True when althttpd_exit() has been called */
static int isRobot = 0; /* 2: is a robot. 1: not a robot. 0: unknown */
static int isCGI = 0; /* True if CGI was run */
static int mxChild = 1000; /* Maximum number of child processes */
/* Forward reference */
static void Malfunction(int errNo, const char *zFormat, ...);
#ifdef ENABLE_TLS
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/x509.h>
typedef struct TlsServerConn {
SSL *ssl; /* The SSL codec */
BIO *bio; /* SSL BIO object */
int iSocket; /* The socket */
} TlsServerConn;
/*
** There can only be a single OpenSSL IO connection open at a time.
** State information about that IO is stored in the following
** global singleton:
*/
static struct TlsState {
int isInit; /* 0: uninit 1: init as client 2: init as server */
SSL_CTX *ctx;
const char *zCertFile; /* --cert CLI arg */
const char *zKeyFile; /* --pkey CLI arg */
TlsServerConn * sslCon;
} tlsState = {
0, /* isInit */
NULL, /* SSL_CTX *ctx */
NULL, /* zCertFile */
NULL, /* zKeyFile */
NULL /* sslCon */
};
/*
** Read a single line of text from the client and stores it in zBuf
** (which must be at least nBuf bytes long). On error it
** calls Malfunction().
**
** If it reads anything, it returns zBuf.
*/
static char *tls_gets(void *pServerArg, char *zBuf, int nBuf){
int n = 0, err = 0;
int i;
TlsServerConn * const pServer = (TlsServerConn*)pServerArg;
if( BIO_eof(pServer->bio) ) return 0;
for(i=0; i<nBuf-1; i++){
n = SSL_read(pServer->ssl, &zBuf[i], 1);
err = SSL_get_error(pServer->ssl, n);
if( err!=0 ){
Malfunction(525,"SSL read error.");
}else if( 0==n || zBuf[i]=='\n' ){
break;
}
}
zBuf[i+1] = 0;
return zBuf;
}
/*
** Reads up tp nBuf bytes of TLS-decoded bytes from the client and
** stores them in zBuf, which must be least nBuf bytes long. Returns
** the number of bytes read. Fails fatally if nBuf is "too big" or if
** SSL_read() fails. Once pServerArg reaches EOF, this function simply
** returns 0 with no side effects.
*/
static size_t tls_read_server(void *pServerArg, void *zBuf, size_t nBuf){
int err = 0;
size_t rc = 0;
TlsServerConn * const pServer = (TlsServerConn*)pServerArg;
if( nBuf>0x7fffffff ){
Malfunction(526,"SSL read too big"); /* LOG: SSL read too big */
}
while( 0==err && nBuf!=rc && 0==BIO_eof(pServer->bio) ){
const int n = SSL_read(pServer->ssl, zBuf + rc, (int)(nBuf - rc));
if( n==0 ){
break;
}
err = SSL_get_error(pServer->ssl, n);
if(0==err){
rc += n;
}else{
Malfunction(527,"SSL read error."); /* LOG: SSL read error */
}
}
return rc;
}
/*
** Write cleartext bytes into the SSL server codec so that they can
** be encrypted and sent back to the client. On success, returns
** the number of bytes written, else returns a negative value.
*/
static int tls_write_server(void *pServerArg, void const *zBuf, size_t nBuf){
int n;
TlsServerConn * const pServer = (TlsServerConn*)pServerArg;
if( nBuf<=0 ) return 0;
if( nBuf>0x7fffffff ){
Malfunction(528,"SSL write too big"); /* LOG: SSL write too big */
}
n = SSL_write(pServer->ssl, zBuf, (int)nBuf);
if( n<=0 ){
/* Do NOT call Malfunction() from here, as Malfunction()
** may output via this function. The current error handling
** is somewhat unsatisfactory, as it can lead to negative
** response length sizes in the althttpd log. */
return -SSL_get_error(pServer->ssl, n);
}else{
return n;
}
}
#endif /* ENABLE_TLS */
/*
** A printf() proxy which outputs either to stdout or the outbound TLS
** connection, depending on connection state. It uses a
** statically-sized buffer for TLS output and will fail (via
** Malfunction()) if it's passed too much data. In non-TLS mode it has
** no such limitation. The buffer is generously sized, in any case, to
** be able to handle all of the headers output by althttpd as of the
** time of this writing.
*/
#ifdef ENABLE_TLS
static int althttpd_vprintf(char const * fmt, va_list va){
if( useHttps!=2 || NULL==tlsState.sslCon ){
return vprintf(fmt, va);
}else{
char pfBuffer[10000];
const int sz = vsnprintf(pfBuffer, sizeof(pfBuffer), fmt, va);
if( sz<(int)sizeof(pfBuffer) ){
return (int)tls_write_server(tlsState.sslCon, pfBuffer, sz);
}else{
Malfunction(529, /* LOG: Output buffer too small */
"Output buffer is too small. Wanted %d bytes.", sz);
return 0;
}
}
}
#else
#define althttpd_vprintf vprintf
#endif
#ifdef ENABLE_TLS
static int althttpd_printf(char const * fmt, ...){
int rc;
va_list va;
va_start(va,fmt);
rc = althttpd_vprintf(fmt, va);
va_end(va);
return rc;
}
static void *tls_new_server(int iSocket);
static void tls_close_server(void *pServerArg);
static void tls_atexit(void);
#else
#define althttpd_printf printf
#endif
/* forward references */
static int tls_init_conn(int iSocket);
static void tls_close_conn(void);
static void althttpd_fflush(FILE *f);
/*
** Flush stdout then exit() with the given result code. This must
** always be used instead of exit() so that a corner case involving
** post-exit() signal handling via Timeout() can be accounted for.
*/
static void althttpd_exit(int iErrCode){
assert( isExiting == 0 );
isExiting = iErrCode ? iErrCode : 1;
althttpd_fflush(stdout);
tls_close_conn();
exit(iErrCode);
}
/*
** Mapping between CGI variable names and values stored in
** global variables.
*/
static struct {
char *zEnvName;
char **pzEnvValue;
} cgienv[] = {
{ "CONTENT_LENGTH", &zContentLength }, /* Must be first for SCGI */
{ "AUTH_TYPE", &zAuthType },
{ "AUTH_CONTENT", &zAuthArg },
{ "CONTENT_TYPE", &zContentType },
{ "DOCUMENT_ROOT", &zHome },
{ "HTTP_ACCEPT", &zAccept },
{ "HTTP_ACCEPT_ENCODING", &zAcceptEncoding },
{ "HTTP_COOKIE", &zCookie },
{ "HTTP_HOST", &zHttpHost },
{ "HTTP_IF_MODIFIED_SINCE", &zIfModifiedSince },
{ "HTTP_IF_NONE_MATCH", &zIfNoneMatch },
{ "HTTP_REFERER", &zReferer },
{ "HTTP_SCHEME", &zHttpScheme },
{ "HTTP_USER_AGENT", &zAgent },
{ "HTTPS", &zHttps },
{ "PATH", &default_path },
{ "PATH_INFO", &zPathInfo },
{ "QUERY_STRING", &zQueryString },
{ "REMOTE_ADDR", &zRemoteAddr },
{ "REQUEST_METHOD", &zMethod },
{ "REQUEST_URI", &zRequestUri },
{ "REMOTE_USER", &zRemoteUser },
{ "SCGI", &zScgi },
{ "SCRIPT_DIRECTORY", &zDir },
{ "SCRIPT_FILENAME", &zFile },
{ "SCRIPT_NAME", &zRealScript },
{ "SERVER_NAME", &zServerName },
{ "SERVER_PORT", &zServerPort },
{ "SERVER_PROTOCOL", &zProtocol },
{ "SERVER_SOFTWARE", &zServerSoftware },
};
/*
** A structure for holding a single date and time.
*/
typedef struct DateTime DateTime;
struct DateTime {
long long int iJD; /* The julian day number times 86400000 */
int Y, M, D; /* Year, month, and day */
int h, m; /* Hour and minutes */
double s; /* Seconds */
};
/*
** Populates p based on the unix timestamp (seconds since 1970-01-01 00:00:00)
** stored in t.
*/
static void unixToDateTime(time_t t, DateTime *p){
int Z, A, B, C, D, E, X1;
int day_s;
p->iJD = (long long)((t/86400.0 + 2440587.5) * 86400000);
Z = (int)((p->iJD + 43200000)/86400000);
A = (int)((Z - 1867216.25)/36524.25);
A = Z + 1 + A - (A/4);
B = A + 1524;
C = (int)((B - 122.1)/365.25);
D = (36525*(C&32767))/100;
E = (int)((B-D)/30.6001);
X1 = (int)(30.6001*E);
p->D = B - D - X1;
p->M = E<14 ? E-1 : E-13;
p->Y = p->M>2 ? C - 4716 : C - 4715;
day_s = t % 86400;
p->h = day_s / 3600;
p->m = day_s % 3600 / 60;
p->s = day_s % 60;
#if 0
fprintf(stderr,"day_s = %d, DateTime Y=%d M=%d D=%d h=%d m=%d s=%d\n",
(int)day_s,
p->Y, p->M, p->D,
p->h, p->m, (int)p->s);
#endif
}
#ifdef COMBINED_LOG_FORMAT
/*
** Copies and converts _relevant_ fields of pD into pTm. Only those
** fields relevant for althttpd's own logging are handled and the rest
** are zeroed out, thus pTm is not necessarily suitable for all
** strftime() formats or libc time functions after calling this.
*/
static void DateTime_toTm(const DateTime *pD, struct tm *pTm){
memset(pTm, 0, sizeof(*pTm));
pTm->tm_isdst = -1;
pTm->tm_sec = (int)pD->s;
pTm->tm_min = pD->m;
pTm->tm_hour = pD->h;
pTm->tm_mday = pD->D;
pTm->tm_mon = pD->M - 1;
pTm->tm_year = pD->Y - 1900;
}
#endif
/*
** Convert a struct timeval into an integer number of microseconds
*/
static long long int tvms(struct timeval *p){
return ((long long int)p->tv_sec)*1000000 + (long long int)p->tv_usec;
}
/*
** Convert a struct timespec into an integer number of microseconds
*/
static long long int tsms(struct timespec *p){
return ((long long int)p->tv_sec)*1000000 + (long long int)(p->tv_nsec/1000);
}
/*
**************************************************************************
** NOTE: The following log_xxx() routines are doing work that fprintf()
** would normally do for us. But we cannot use fprintf() because these
** routines are called from within an interrupt handler.
*/
/*
** Append text to z[] if there is space available in z[] to do so safely.
** zIn is zero-terminated text to be appended.
**
** If sufficient space exists in z[] to hold zIn[], then do the append
** and set *pzTail to point to the zero-terminator on z[] after zIn[] has
** been appended. In other words, *pzTail is left pointing to the spot
** where the next append should begin. A pointer to z[] is returned.
**
** If z[] is not large enough to hold all of zIn[] or if z is NULL, then
** leave z[] unchanged, return NULL, and set *pzTail to NULL.
**
** If zIn is NULL, then *pzTail is set to zEnd and z[] is returned
** unchanged. This routine is essentially a no-op in that case.
*/
static char *log_str(
char *z, /* Append text from zIn[] into this buffer */
const char *zEnd, /* Last byte of available space for z[] */
const char *zIn, /* Text that should be appended to z[]. NOT NULL */
char **pzTail /* Write pointer to new zero-terminator in z[] */
){
const size_t n = z ? strlen(zIn) : 0;
if( !z || zEnd<=z+n ){
*pzTail = 0;
return 0;
}
memcpy( z, zIn, n );
*pzTail = z+n;
return z;
}
/*
** Works like log_str() but doubles all double-quote characters in the
** input. If z is NULL or zIn is too long for the input buffer,
** *zTail is set to 0 and 0 is returned.
**
** This is used to quote strings for output into the CSV log file.
*/
static char *log_escstr(
char *z, /* Append escaped text to this buffer */
const char *zEnd, /* Last available byte of z[] */
const char *zIn, /* Text to be appended. NOT NULL. */
char **pzTail /* Write new zero-terminator of z[] here */
){
char *zOrig = z;
char c = *zIn;
if( !z || z>=zEnd ){
goto too_short;
}
for( ; c && z<zEnd; c=*++zIn ){
if( '"'==c ){
if( z>=zEnd-1 ){
goto too_short;
}
*z++ = c;
}
*z++ = c;
}
*pzTail = z;
return zOrig;
too_short:
*pzTail = 0;
return 0;
}
/*
** Convert 64-bit signed integer "d" into text and append that text
** onto the end of buffer z[] if there is sufficient space in z[].
**
** Appends d to z, sets *zpTail to the byte after the new end of z, and
** returns z. If appending d would extend past zEnd then *zTail is set
** to 0 and 0 is returned, but z is not modified. If z is NULL, *zTail
** is set to 0 but this is otherwise a no-op.
**
** minDigits must be at least 1 and d will be left-padded with 0's to
** a minimum of that length.
*/
static char *log_int(
char *z, /* Append text representation of d here */
const char *zEnd, /* Last available byte of space in z[] */
long long int d, /* 64-bit signed integer value to be converted */
int minDigits, /* Minimum number of digits to display */
char **pzTail /* OUT: The next zero-terminator in z[] */
){
char buf[128];
int i = (int)sizeof(buf), n = 0;
int neg = 0;
assert( minDigits>0 && minDigits<=4 );
if( !z ){
*pzTail = 0;
return 0;
}else if( d<0 ){
neg = 1;
d = -d;
}
for( ; (minDigits-- > 0) || d>0; d/=10 ){
buf[--i] = '0' + (d%10);
++n;
}
if( neg ){
buf[--i] = '-';
++n;
}
if( zEnd <= z+n ){
return 0;
}
memcpy(z, &buf[i], n);
*pzTail = z+n;
return z;
}
#ifndef COMBINED_LOG_FORMAT
/*
** Append date/time pD (rendered as "YYYY-MM-DD hh:mm:ss") to z[] if
** space is available in z[]. Leave *pzTail pointing to the NULL
** terminator and return a pointer to z[].
**
** If insufficient space is available in z[] to hold the new decoded
** date/time, then set *pzTail to NULL and return a NULL pointer.
*/
static char *log_DateTime(
char * z, /* Append YYYY-MM-DD hh:mm:ss to this buffer */
const char *zEnd, /* Last available byte in buffer z[] */
const struct DateTime *pD, /* The date/time to be appended */
char **pzTail /* OUT: zero terminator after appending */
){
char *zOut = z;
if( z+19 >= zEnd ){
*pzTail = 0;
return 0;
}
#define aint(N,DIGITS,SUFFIX) log_int(zOut,zEnd,(int)(N),(DIGITS),&zOut); \
if( SUFFIX ) log_str( zOut, zEnd, SUFFIX, &zOut )
aint(pD->Y, 4, "-");
aint(pD->M, 2, "-");
aint(pD->D, 2, " ");
aint(pD->h, 2, ":");
aint(pD->m, 2, ":");
aint(pD->s, 2, 0);
#undef aint
*pzTail = zOut;
return z;
}
#endif
/*
** Make an entry in the log file. If the HTTP connection should be
** closed, then terminate this process. Otherwise return.
**
** This routine might be called from a signal handler. Make sure
** this routine does not invoke any subroutines that are not signal-safe
** if the global variable inSignalHandler is set. Note that fprintf()
** is not signal-safe on all systems.
*/
static void MakeLogEntry(int exitCode, int lineNum){
int logfd;
if( zPostData ){
if( inSignalHandler==0 ){
free(zPostData);
}
zPostData = 0;
}
if( zLogFile && !omitLog ){
struct rusage self, children;
int waitStatus;
const char *zRM = zRemoteUser ? zRemoteUser : "";
const char *zFilename;
if( zScript==0 ) zScript = "";
if( zRealScript==0 ) zRealScript = "";
if( zRemoteAddr==0 ) zRemoteAddr = "";
if( zHttpHost==0 ) zHttpHost = "";
if( zReferer==0 ) zReferer = "";
if( zAgent==0 ) zAgent = "";
if( zQuerySuffix==0 ) zQuerySuffix = "";
if( zExpLogFile[0]!=0 ){
zFilename = zExpLogFile;
}else{
zFilename = zLogFile;
}
waitpid(-1, &waitStatus, WNOHANG);
if( inSignalHandler!=0 ){
/* getrusage() is not signal-safe, so fall back to 0. */
self = priorSelf;
children = priorChild;
}else{
getrusage(RUSAGE_SELF, &self);
getrusage(RUSAGE_CHILDREN, &children);
}
if( (logfd = open(zFilename,O_WRONLY | O_CREAT | O_APPEND, 0640)) > 0 ){
time_t tNow; /* current time */
struct timespec tsNow; /* current time (again!) */
struct DateTime dt; /* high-level tNow */
char msgbuf[5000]; /* message buffer */
const char * const zEnd = &msgbuf[0] + sizeof(msgbuf);
char * zPos = &msgbuf[0]; /* current write pos */
long long int t; /* Elapse CGI time */
#define astr( STR ) log_str( zPos, zEnd, (STR), &zPos )
#define acomma astr(",")
#define astr2( STR ) astr( STR ); acomma
#define aint( N ) log_int( zPos, zEnd, (N), 1, &zPos ); acomma
clock_gettime(ALTHTTPD_CLOCK_ID, &tsNow);
time(&tNow);
unixToDateTime(tNow, &dt);
#ifdef COMBINED_LOG_FORMAT
/* COMBINED_LOG_FORMAT is a log-file format used by some other
** web servers. Support for COMBINED_LOG_FORMAT was added at some
** point in althttpd's history. But there are no known current
** users. COMBINED_LOG_FORMAT is deprecated
*/
/* Potential TODO: eliminate use of strftime(). Default builds
** of althttpd do not use COMBINED_LOG_FORMAT, so this is a
** low-priority issue. */
{
struct tm vTm/* to remove once we have a strftime() substitute */;
char zDate[200];
#if 0
/* Older impl, for reference: */
fprintf(log, "%s - - [%s] \"%s %s %s\" %s %d \"%s\" \"%s\"\n",
zRemoteAddr, zDate, zMethod, zScript, zProtocol,
zReplyStatus, nOut, zReferer, zAgent);
#endif
DateTime_toTm(&dt, &vTm);
strftime(zDate, sizeof(zDate), "%d/%b/%Y:%H:%M:%S %Z", &vTm);
astr( zRemoteAddr );
astr( " - - [" );
astr( zDate );
astr( "] \"" );
astr( zMethod );
astr( " " );
astr( zScript );
astr( " " );
astr( zProtocol );
astr( "\" " );
astr( zReplyStatus );
astr( " " );
aint( nOut );
astr( " \"" );
astr( zReferer );
astr( "\" \"" );
astr( zAgent );
astr( "\"\n" );
}
#else
/* Log record files:
** (1) Date and time
** (2) IP address
** (3) URL being accessed
** (4) Referer
** (5) Reply status
** (6) Bytes received
** (7) Bytes sent
** (8) Self user time
** (9) Self system time
** (10) Children user time
** (11) Children system time
** (12) Total wall-clock time
** (13) Request number for same TCP/IP connection
** (14) User agent
** (15) Remote user
** (16) Bytes of URL that correspond to the SCRIPT_NAME
** (17) Line number in source file
*/
#define escstr(X) log_escstr( zPos, zEnd, X, &zPos )
/* (1) */ log_DateTime( zPos, zEnd, &dt, &zPos );
astr(",");
/* (2) */ astr2( zRemoteAddr );
/* (3) */ astr( "\"" );
astr( zHttpScheme );
astr( "://" );
escstr(zHttpHost);
escstr(zScript);
escstr(zQuerySuffix);
astr2( "\"" );
/* (4) */ astr( "\"" ); escstr(zReferer); astr2("\"");
/* (5) */ astr2( zReplyStatus );
/* (6) */ aint( nIn );
/* (7) */ aint( nOut );
/* (8) */ aint( tvms(&self.ru_utime) - tvms(&priorSelf.ru_utime) );
/* (9) */ aint( tvms(&self.ru_stime) - tvms(&priorSelf.ru_stime) );
t = tvms(&children.ru_utime) - tvms(&priorChild.ru_utime);
if( isCGI ){
if( t==0 ) t = 1;
isCGI = 0;
}
/* (10) */ aint( t );
/* (11) */ aint( tvms(&children.ru_stime) - tvms(&priorChild.ru_stime) );
/* (12) */ aint( tsms(&tsNow) - tsms(&tsBeginTime) );
/* (13) */ aint( nRequest );
/* (14) */ astr( "\"" ); escstr(zAgent); astr2("\"");
/* (15) */ astr( "\"" ); escstr(zRM); astr2("\"");
/* (16) */ aint( strlen(zHttpScheme) +
strlen(zHttpHost) +
strlen(zRealScript)+3 );
if( lineNum==0 ) lineNum = isRobot;
isRobot = 0;
/* (17) */ log_int( zPos, zEnd, lineNum, 1, &zPos );
#undef escstr
#ifdef ALTHTTPD_LOG_PID
/* Appending of PID to the log is used only to assist in
** debugging of hanging althttpd processes:
** https://sqlite.org/althttpd/forumpost/4dc31619341ce947 */
acomma;
/* (18) */ log_int( zPos, zEnd, getpid(), 1, &zPos );
#endif /* ALTHTTPD_LOG_PID */
astr( "\n" );
priorSelf = self;
priorChild = children;
#endif
if( zPos!=0 ){
size_t iStart = 0;
size_t toSend;
size_t nSent;
assert( zPos<zEnd-1 );
assert( zPos>&msgbuf[0] );
*zPos = 0;
toSend = zPos - &msgbuf[0];
while( 1 /*exit-by-break*/ ){
nSent = write( logfd, msgbuf+iStart, toSend);
if( nSent<=0 ) break;
if( nSent>=toSend ) break;
iStart += nSent;
toSend -= nSent;
}
}
close(logfd);
nIn = nOut = 0;
#undef astr
#undef astr2
#undef aint
#undef acomma
}
}
if( closeConnection || inSignalHandler ){
althttpd_exit(exitCode);
}
statusSent = 0;
}
/*
** Allocate memory safely
*/
static char *SafeMalloc( size_t size ){
char *p;
p = (char*)malloc(size);
if( p==0 ){
strcpy(zReplyStatus, "998");
MakeLogEntry(1,100); /* LOG: Malloc() failed */
althttpd_exit(1);
}
return p;
}
/* Forward reference */
static void BlockIPAddress(void);
static void ServiceUnavailable(int lineno);
/*
** Set the value of environment variable zVar to zValue.
*/
static void SetEnv(const char *zVar, const char *zValue){
char *z;
size_t len;
if( zValue==0 ) zValue="";
/* Disable an attempted bashdoor attack */
if( strncmp(zValue,"() {",4)==0 ){
BlockIPAddress();
ServiceUnavailable(902); /* LOG: 902 bashdoor attack */
zValue = "";
}
len = strlen(zVar) + strlen(zValue) + 2;
z = SafeMalloc(len);
sprintf(z,"%s=%s",zVar,zValue);
putenv(z);
}
/*
** Remove the first space-delimited token from a string and return
** a pointer to it. Add a NULL to the string to terminate the token.
** Make *zLeftOver point to the start of the next token.
*/
static char *GetFirstElement(char *zInput, char **zLeftOver){
char *zResult = 0;
if( zInput==0 ){
if( zLeftOver ) *zLeftOver = 0;
return 0;
}
while( isspace(*(unsigned char*)zInput) ){ zInput++; }
zResult = zInput;
while( *zInput && !isspace(*(unsigned char*)zInput) ){ zInput++; }
if( *zInput ){
*zInput = 0;
zInput++;
while( isspace(*(unsigned char*)zInput) ){ zInput++; }
}
if( zLeftOver ){ *zLeftOver = zInput; }
return zResult;
}
/*
** Make a copy of a string into memory obtained from malloc.
*/
static char *StrDup(const char *zSrc){
char *zDest;
size_t size;
if( zSrc==0 ) return 0;
size = strlen(zSrc) + 1;
zDest = (char*)SafeMalloc( size );
strcpy(zDest,zSrc);
return zDest;
}
static char *StrAppend(char *zPrior, const char *zSep, const char *zSrc){
char *zDest;
size_t size;
size_t n0, n1, n2;
if( zSrc==0 ) return 0;
if( zPrior==0 ) return StrDup(zSrc);
n0 = strlen(zPrior);
n1 = strlen(zSep);
n2 = strlen(zSrc);
size = n0+n1+n2+1;
zDest = (char*)SafeMalloc( size );
memcpy(zDest, zPrior, n0);
free(zPrior);
memcpy(&zDest[n0],zSep,n1);
memcpy(&zDest[n0+n1],zSrc,n2+1);
return zDest;
}
/*
** Construct the REQUEST_URI value from zString and zQueryString.
**
** REQUEST_URI is nominally the second field of the first line of the
** HTTP request. But we might have done some sanitization on the
** SCRIPT_NAME and/or PATH_INFO and we want to capture that in the
** REQUEST_URI. Hence, the REQUEST_URI is recomputed before being
** sent to CGI or SCGI.
*/
static void ComputeRequestUri(void){
if( zQueryString==0 || zQueryString[0]==0 ){
zRequestUri = zScript;
}else{
zRequestUri = StrAppend(zScript, "?", zQueryString);
}
}
/*
** Compare two ETag values. Return 0 if they match and non-zero if they differ.
**
** The one on the left might be a NULL pointer and it might be quoted.
*/
static int CompareEtags(const char *zA, const char *zB){
if( zA==0 ) return 1;
if( zA[0]=='"' ){
int lenB = (int)strlen(zB);
if( strncmp(zA+1, zB, lenB)==0 && zA[lenB+1]=='"' ) return 0;
}
return strcmp(zA, zB);
}
/*
** Break a line at the first \n or \r character seen.
*/
static void RemoveNewline(char *z){
if( z==0 ) return;
while( *z && *z!='\n' && *z!='\r' ){ z++; }
*z = 0;
}
/* Render seconds since 1970 as an RFC822 date string. Return
** a pointer to that string in a static buffer.
*/
static char *Rfc822Date(time_t t){
struct tm *tm;
static char zDate[100];
tm = gmtime(&t);
strftime(zDate, sizeof(zDate), "%a, %d %b %Y %H:%M:%S GMT", tm);
return zDate;
}
/*
** Print a date tag in the header. The name of the tag is zTag.
** The date is determined from the unix timestamp given.
*/
static int DateTag(const char *zTag, time_t t){
return althttpd_printf("%s: %s" CRLF, zTag, Rfc822Date(t));
}
/*
** Parse an RFC822-formatted timestamp as we'd expect from HTTP and return
** a Unix epoch time. <= zero is returned on failure.
*/
time_t ParseRfc822Date(const char *zDate){
int mday, mon, year, yday, hour, min, sec;
char zIgnore[4];
char zMonth[4];
static const char *const azMonths[] =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
if( 7==sscanf(zDate, "%3[A-Za-z], %d %3[A-Za-z] %d %d:%d:%d", zIgnore,
&mday, zMonth, &year, &hour, &min, &sec)){
if( year > 1900 ) year -= 1900;
for(mon=0; mon<12; mon++){
if( !strncmp( azMonths[mon], zMonth, 3 )){
int nDay;
int isLeapYr;
static int priorDays[] =
{ 0, 31, 59, 90,120,151,181,212,243,273,304,334 };
isLeapYr = year%4==0 && (year%100!=0 || (year+300)%400==0);
yday = priorDays[mon] + mday - 1;
if( isLeapYr && mon>1 ) yday++;
nDay = (year-70)*365 + (year-69)/4 - year/100 + (year+300)/400 + yday;
return ((time_t)(nDay*24 + hour)*60 + min)*60 + sec;
}
}
}
return 0;
}
/*
** Test procedure for ParseRfc822Date
*/
void TestParseRfc822Date(void){
time_t t1, t2;
for(t1=0; t1<0x7fffffff; t1 += 127){
t2 = ParseRfc822Date(Rfc822Date(t1));
assert( t1==t2 );
}
}
/*
** Print the first line of a response followed by the server type.
*/
static void StartResponse(const char *zResultCode){
time_t now;
time(&now);
if( statusSent ) return;
nOut += althttpd_printf("%s %s" CRLF,
zProtocol ? zProtocol : "HTTP/1.1",
zResultCode);
strncpy(zReplyStatus, zResultCode, 3);
zReplyStatus[3] = 0;
if( zReplyStatus[0]>='4' ){
closeConnection = 1;
}
if( closeConnection ){
nOut += althttpd_printf("Connection: close" CRLF);
}else{
nOut += althttpd_printf("Connection: keep-alive" CRLF);
}
nOut += DateTag("Date", now);
statusSent = 1;
}
/*
** Check all of the files in the zIPShunDir directory. Unlink any
** files in that directory that have expired.
**
** This routine might be slow if there are a lot of blocker files.
** So it only runs when we are not in a hurry, such as prior to sending
** a 404 Not Found reply.
*/
static void UnlinkExpiredIPBlockers(void){
DIR *pDir;
struct dirent *pFile;
size_t nIPShunDir;
time_t now;
char zFilename[2000];
if( zIPShunDir==0 ) return;
if( zIPShunDir[0]!='/' ) return;
nIPShunDir = strlen(zIPShunDir);
while( nIPShunDir>0 && zIPShunDir[nIPShunDir-1]=='/' ) nIPShunDir--;
if( nIPShunDir > sizeof(zFilename)-100 ) return;
memcpy(zFilename, zIPShunDir, nIPShunDir);
zFilename[nIPShunDir] = 0;
pDir = opendir(zFilename);
if( pDir==0 ) return;
zFilename[nIPShunDir] = '/';
time(&now);
while( (pFile = readdir(pDir))!=0 ){
size_t nFile = strlen(pFile->d_name);
int rc;
struct stat statbuf;
if( nIPShunDir+nFile >= sizeof(zFilename)-2 ) continue;
if( strstr(pFile->d_name, "..") ) continue;
memcpy(zFilename+nIPShunDir+1, pFile->d_name, nFile+1);
memset(&statbuf, 0, sizeof(statbuf));
rc = stat(zFilename, &statbuf);
if( rc ) continue;
if( !S_ISREG(statbuf.st_mode) ) continue;
if( statbuf.st_size==0 ) continue;
if( statbuf.st_size*5*BANISH_TIME + statbuf.st_mtime > now ) continue;
unlink(zFilename);
}
closedir(pDir);
}
/* Return true if the request URI contained in zScript[] seems like a
** hack attempt.
*/
static int LikelyHackAttempt(void){
static const char *azHackUris[] = {
"/../",
"/./",
"_SELECT_",
"_select_",
"_sleep_",
"_OR_",
"_AND_",
"/etc/passwd",
"/bin/sh",
"/.git/",
"/swagger.yaml",
"/phpThumb.php",
"/.htpasswd",
"/.passwd",
"/tomcat/manager/status/",
"/WEB-INF/jboss-web.xml",
"/phpMyAdmin/setup/index.php",
"/examples/feed-viewer/feed-proxy.php",
};
unsigned int i;
if( zScript==0 ) return 0;
if( zScript[0]==0 ) return 0;
if( zScript[0]!='/' ) return 1;
for(i=0; i<sizeof(azHackUris)/sizeof(azHackUris[0]); i++){
if( strstr(zScript, azHackUris[i])!=0 ) return 1;
}
return 0;
}
/*
** An abusive HTTP request has been submitted by the IP address zRemoteAddr.
** Block future requests coming from this IP address.
**
** This only happens if the zIPShunDir variable is set, which is only set
** by the --ipshun command-line option. Without that setting, this routine
** is a no-op.
**
** If zIPShunDir is a valid directory, then this routine uses zRemoteAddr
** as the name of a file within that directory. Cases:
**
** + The file already exists and is not an empty file. This will be the
** case if the same IP was recently blocked, but the block has expired,
** and yet the expiration was not so long ago that the blocking file has
** been unlinked. In this case, add one character to the file, which
** will update its mtime (causing it to be active again) and increase
** its expiration timeout.
**
** + The file exists and is empty. This happens if the administrator
** uses "touch" to create the file. An empty blocking file indicates
** a permanent block. Do nothing.
**
** + The file does not exist. Create it anew and make it one byte in size.
**
** The UnlinkExpiredIPBlockers() routine will run from time to time to
** unlink expired blocker files. If the DisallowedRemoteAddr() routine finds
** an expired blocker file corresponding to zRemoteAddr, it might unlink
** that one blocker file if the file has been expired for long enough.
*/
static void BlockIPAddress(void){
size_t nIPShunDir;
size_t nRemoteAddr;
int rc;
struct stat statbuf;
char zFullname[1000];
if( zIPShunDir==0 ) return;
if( zRemoteAddr==0 ) return;
if( zRemoteAddr[0]==0 ) return;
/* If we reach this point, it means that a suspicious request was
** received and we want to activate IP blocking on the remote
** address.
*/
nIPShunDir = strlen(zIPShunDir);
while( nIPShunDir>0 && zIPShunDir[nIPShunDir-1]=='/' ) nIPShunDir--;
nRemoteAddr = strlen(zRemoteAddr);
if( nIPShunDir + nRemoteAddr + 2 >= sizeof(zFullname) ){
Malfunction(914, /* LOG: buffer overflow */
"buffer overflow");
}
memcpy(zFullname, zIPShunDir, nIPShunDir);
zFullname[nIPShunDir] = '/';
memcpy(zFullname+nIPShunDir+1, zRemoteAddr, nRemoteAddr+1);
rc = stat(zFullname, &statbuf);
if( rc!=0 || statbuf.st_size>0 ){
FILE *lock = fopen(zFullname, "a");
if( lock ){
fputc('X', lock);
fclose(lock);
}
}
}
/*
** Send a service-unavailable reply.
*/
static void ServiceUnavailable(int lineno){
StartResponse("503 Service Unavailable");
nOut += althttpd_printf(
"Content-type: text/plain; charset=utf-8" CRLF
CRLF
"Service to IP address %s temporarily blocked due to abuse\n",
zRemoteAddr
);
closeConnection = 1;
MakeLogEntry(0, lineno);
althttpd_exit(0);
}
/*
** Tell the client that there is no such document
*/
static void NotFound(int lineno){
if( LikelyHackAttempt() ){
BlockIPAddress();
ServiceUnavailable(lineno);
}
UnlinkExpiredIPBlockers();
StartResponse("404 Not Found");
nOut += althttpd_printf(
"Content-type: text/html; charset=utf-8" CRLF
CRLF
"<html><head><title lineno=\"%d\">Not Found</title></head>\n"
"<body><h1>Document Not Found</h1>\n"
"The document %s is not available on this server\n"
"</body></html>\n", lineno, zScript);
MakeLogEntry(0, lineno);
althttpd_exit(0);
}
/*
** Tell the client that they are not welcomed here.
*/
static void Forbidden(int lineno){
StartResponse("403 Forbidden");
nOut += althttpd_printf(
"Content-type: text/plain; charset=utf-8" CRLF
CRLF
"Access denied\n"
);
closeConnection = 1;
MakeLogEntry(0, lineno);
althttpd_exit(0);
}
/*
** Tell the client that authorization is required to access the
** document.
*/
static void NotAuthorized(const char *zRealm){
StartResponse("401 Authorization Required");
nOut += althttpd_printf(
"WWW-Authenticate: Basic realm=\"%s\"" CRLF
"Content-type: text/html; charset=utf-8" CRLF
CRLF
"<head><title>Not Authorized</title></head>\n"
"<body><h1>401 Not Authorized</h1>\n"
"A login and password are required for this document\n"
"</body>\n", zRealm);
MakeLogEntry(0, 110); /* LOG: Not authorized */
}
/*
** Tell the client that there is an error in the script.
*/
static void CgiError(void){
StartResponse("500 Error");
nOut += althttpd_printf(
"Content-type: text/html; charset=utf-8" CRLF
CRLF
"<head><title>CGI Program Error</title></head>\n"
"<body><h1>CGI Program Error</h1>\n"
"The CGI program %s generated an error\n"
"</body>\n", zScript);
MakeLogEntry(0, 120); /* LOG: CGI Error */
althttpd_exit(0);
}
/*
** Set the timeout in seconds. 0 means no-timeout.
*/
static void SetTimeout(int nSec, int lineNum){
if( useTimeout ){
nTimeoutLine = lineNum;
alarm(nSec);
}
}
/*
** This is called if we timeout or catch some other kind of signal.
** Log an error code which is 900+iSig and then quit.
**
** If called after althttpd_exit(), this is a no-op.
*/
static void Timeout(int iSig){
if( debugFlag==0 && isExiting==0 ){
if( zScript && zScript[0] ){
char zBuf[10];
zBuf[0] = '9';
zBuf[1] = '0' + (iSig/10)%10;
zBuf[2] = '0' + iSig%10;
zBuf[3] = 0;
strcpy(zReplyStatus, zBuf);
++inSignalHandler;
switch( iSig ){
case SIGALRM:
MakeLogEntry(0, nTimeoutLine);
break;
case SIGSEGV:
MakeLogEntry(0, 131); /* LOG: SIGSEGV */
break;
case SIGPIPE:
MakeLogEntry(0, 132); /* LOG: SIGPIPE */
break;
case SIGXCPU:
MakeLogEntry(0, 133); /* LOG: SIGXCPU */
break;
default:
MakeLogEntry(0, 139); /* LOG: Unknown signal */
break;
}
--inSignalHandler;
}
althttpd_exit(0);
}
}
/*
** Tell the client that there is an error in the script.
*/
static void CgiScriptWritable(void){
StartResponse("500 CGI Configuration Error");
nOut += althttpd_printf(
"Content-type: text/plain; charset=utf-8" CRLF
CRLF
"The CGI program %s is writable by users other than its owner.\n",
zRealScript);
MakeLogEntry(0, 140); /* LOG: CGI script is writable */
althttpd_exit(0);
}
/*
** Tell the client that the server malfunctioned.
*/
void Malfunction(int linenum, const char *zFormat, ...){
va_list ap;
va_start(ap, zFormat);
StartResponse("500 Server Malfunction");
nOut += althttpd_printf(
"Content-type: text/plain; charset=utf-8" CRLF
CRLF
"Web server malfunctioned; error number %d\n\n", linenum);
if( zFormat ){
nOut += althttpd_vprintf(zFormat, ap);
althttpd_printf("\n");
nOut++;
}
va_end(ap);
MakeLogEntry(0, linenum);
althttpd_exit(0);
}
/*
** Do a server redirect to the document specified. The document
** name not contain scheme or network location or the query string.
** It will be just the path.
*/
static void Redirect(const char *zPath, int iStatus, int finish, int lineno){
switch( iStatus ){
case 301:
StartResponse("301 Permanent Redirect");
break;
case 308:
StartResponse("308 Permanent Redirect");
break;
default:
StartResponse("302 Temporary Redirect");
break;
}
if( zServerPort==0 || zServerPort[0]==0 || strcmp(zServerPort,"80")==0 ){
nOut += althttpd_printf("Location: %s://%s%s%s" CRLF,
zHttpScheme, zServerName, zPath, zQuerySuffix);
}else{
nOut += althttpd_printf("Location: %s://%s:%s%s%s" CRLF,
zHttpScheme, zServerName, zServerPort, zPath, zQuerySuffix);
}
if( finish ){
nOut += althttpd_printf("Content-length: 0" CRLF CRLF);
MakeLogEntry(0, lineno);
}
fflush(stdout);
}
/*
** This function treats its input as a base-64 string and returns the
** decoded value of that string. Characters of input that are not
** valid base-64 characters (such as spaces and newlines) are ignored.
*/
static void Decode64(char *z64){
char *zData;
int n64;
int i, j;
int a, b, c, d;
static int isInit = 0;
static int trans[128];
static unsigned char zBase[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
if( !isInit ){
for(i=0; i<128; i++){ trans[i] = 0; }
for(i=0; zBase[i]; i++){ trans[zBase[i] & 0x7f] = i; }
isInit = 1;
}
n64 = strlen(z64);
while( n64>0 && z64[n64-1]=='=' ) n64--;
zData = z64;
for(i=j=0; i+3<n64; i+=4){
a = trans[z64[i] & 0x7f];
b = trans[z64[i+1] & 0x7f];
c = trans[z64[i+2] & 0x7f];
d = trans[z64[i+3] & 0x7f];
zData[j++] = ((a<<2) & 0xfc) | ((b>>4) & 0x03);
zData[j++] = ((b<<4) & 0xf0) | ((c>>2) & 0x0f);
zData[j++] = ((c<<6) & 0xc0) | (d & 0x3f);
}
if( i+2<n64 ){
a = trans[z64[i] & 0x7f];
b = trans[z64[i+1] & 0x7f];
c = trans[z64[i+2] & 0x7f];
zData[j++] = ((a<<2) & 0xfc) | ((b>>4) & 0x03);
zData[j++] = ((b<<4) & 0xf0) | ((c>>2) & 0x0f);
}else if( i+1<n64 ){
a = trans[z64[i] & 0x7f];
b = trans[z64[i+1] & 0x7f];
zData[j++] = ((a<<2) & 0xfc) | ((b>>4) & 0x03);
}
zData[j] = 0;
}
#ifdef ENABLE_TLS
/* This is a self-signed cert in the PEM format that can be used when
** no other certs are available.
**
** NB: Use of this self-signed cert is wildly insecure. Use for testing
** purposes only.
*/
static const char sslSelfCert[] =
"-----BEGIN CERTIFICATE-----\n"
"MIIDMTCCAhkCFGrDmuJkkzWERP/ITBvzwwI2lv0TMA0GCSqGSIb3DQEBCwUAMFQx\n"
"CzAJBgNVBAYTAlVTMQswCQYDVQQIDAJOQzESMBAGA1UEBwwJQ2hhcmxvdHRlMRMw\n"
"EQYDVQQKDApGb3NzaWwtU0NNMQ8wDQYDVQQDDAZGb3NzaWwwIBcNMjExMjI3MTEz\n"
"MTU2WhgPMjEyMTEyMjcxMTMxNTZaMFQxCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJO\n"
"QzESMBAGA1UEBwwJQ2hhcmxvdHRlMRMwEQYDVQQKDApGb3NzaWwtU0NNMQ8wDQYD\n"
"VQQDDAZGb3NzaWwwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCCbTU2\n"
"6GRQHQqLq7vyZ0OxpAxmgfAKCxt6eIz+jBi2ZM/CB5vVXWVh2+SkSiWEA3UZiUqX\n"
"xZlzmS/CglZdiwLLDJML8B4OiV72oivFH/vJ7+cbvh1dTxnYiHuww7GfQngPrLfe\n"
"fiIYPDk1GTUJHBQ7Ue477F7F8vKuHdVgwktF/JDM6M60aSqlo2D/oysirrb+dlur\n"
"Tlv0rjsYOfq6bLAajoL3qi/vek6DNssoywbge4PfbTgS9g7Gcgncbcet5pvaS12J\n"
"avhFcd4JU4Ity49Hl9S/C2MfZ1tE53xVggRwKz4FPj65M5uymTdcxtjKXtCxIE1k\n"
"KxJxXQh7rIYjm+RTAgMBAAEwDQYJKoZIhvcNAQELBQADggEBAFkdtpqcybAzJN8G\n"
"+ONuUm5sXNbWta7JGvm8l0BTSBcCUtJA3hn16iJqXA9KmLnaF2denC4EYk+KlVU1\n"
"QXxskPJ4jB8A5B05jMijYv0nzCxKhviI8CR7GLEEGKzeg9pbW0+O3vaVehoZtdFX\n"
"z3SsCssr9QjCLiApQxMzW1Iv3od2JXeHBwfVMFrWA1VCEUCRs8OSW/VOqDPJLVEi\n"
"G6wxc4kN9dLK+5S29q3nzl24/qzXoF8P9Re5KBCbrwaHgy+OEEceq5jkmfGFxXjw\n"
"pvVCNry5uAhH5NqbXZampUWqiWtM4eTaIPo7Y2mDA1uWhuWtO6F9PsnFJlQHCnwy\n"
"s/TsrXk=\n"
"-----END CERTIFICATE-----\n";
/* This is the private-key corresponding to the cert above
*/
static const char sslSelfPKey[] =
"-----BEGIN PRIVATE KEY-----\n"
"MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCCbTU26GRQHQqL\n"
"q7vyZ0OxpAxmgfAKCxt6eIz+jBi2ZM/CB5vVXWVh2+SkSiWEA3UZiUqXxZlzmS/C\n"
"glZdiwLLDJML8B4OiV72oivFH/vJ7+cbvh1dTxnYiHuww7GfQngPrLfefiIYPDk1\n"
"GTUJHBQ7Ue477F7F8vKuHdVgwktF/JDM6M60aSqlo2D/oysirrb+dlurTlv0rjsY\n"
"Ofq6bLAajoL3qi/vek6DNssoywbge4PfbTgS9g7Gcgncbcet5pvaS12JavhFcd4J\n"
"U4Ity49Hl9S/C2MfZ1tE53xVggRwKz4FPj65M5uymTdcxtjKXtCxIE1kKxJxXQh7\n"
"rIYjm+RTAgMBAAECggEANfTH1vc8yIe7HRzmm9lsf8jF+II4s2705y2H5qY+cvYx\n"
"nKtZJGOG1X0KkYy7CGoFv5K0cSUl3lS5FVamM/yWIzoIex/Sz2C1EIL2aI5as6ez\n"
"jB6SN0/J+XI8+Vt7186/rHxfdIPpxuzjHbxX3HTpScETNWcLrghbrPxakbTPPxwt\n"
"+x7QlPmmkFNuMfvkzToFf9NdwL++44TeBPOpvD/Lrw+eyqdth9RJPq9cM96plh9V\n"
"HuRqeD8+QNafaXBdSQs3FJK/cDK/vWGKZWIfFVSDbDhwYljkXGijreFjtXQfkkpF\n"
"rl1J87/H9Ee7z8fTD2YXQHl+0/rghAVtac3u54dpQQKBgQC2XG3OEeMrOp9dNkUd\n"
"F8VffUg0ecwG+9L3LCe7U71K0kPmXjV6xNnuYcNQu84kptc5vI8wD23p29LaxdNc\n"
"9m0lcw06/YYBOPkNphcHkINYZTvVJF10mL3isymzMaTtwDkZUkOjL1B+MTiFT/qp\n"
"ARKrTYGJ4HxY7+tUkI5pUmg4PQKBgQC3GA4d1Rz3Pb/RRpcsZgWknKsKhoN36mSn\n"
"xFJ3wPBvVv2B1ltTMzh/+the0ty6clzMrvoLERzRcheDsNrc/j/TUVG8sVdBYJwX\n"
"tMZyFW4NVMOErT/1ukh6jBqIMBo6NJL3EV/AKj0yniksgKOr0/AAduAccnGST8Jd\n"
"SHOdjwvHzwKBgGZBq/zqgNTDuYseHGE07CMgcDWkumiMGv8ozlq3mSR0hUiPOTPP\n"
"YFjQjyIdPXnF6FfiyPPtIvgIoNK2LVAqiod+XUPf152l4dnqcW13dn9BvOxGyPTR\n"
"lWCikFaAFviOWjY9r9m4dU1dslDmySqthFd0TZgPvgps9ivkJ0cdw30NAoGAMC/E\n"
"h1VvKiK2OP27C5ROJ+STn1GHiCfIFd81VQ8SODtMvL8NifgRBp2eFFaqgOdYRQZI\n"
"CGGYlAbS6XXCJCdF5Peh62dA75PdgN+y2pOJQzjrvB9cle9Q4++7i9wdCvSLOTr5\n"
"WDnFoWy+qVexu6crovOmR9ZWzYrwPFy1EOJ010ECgYBl7Q+jmjOSqsVwhFZ0U7LG\n"
"diN+vXhWfn1wfOWd8u79oaqU/Oy7xyKW2p3H5z2KFrBM/vib53Lh4EwFZjcX+jVG\n"
"krAmbL+M/hP7z3TD2UbESAzR/c6l7FU45xN84Lsz5npkR8H/uAHuqLgb9e430Mjx\n"
"YNMwdb8rChHHChNZu6zuxw==\n"
"-----END PRIVATE KEY-----\n";
/*
** Read a PEM certificate from memory and push it into an SSL_CTX.
** Return the number of errors.
*/
static int sslctx_use_cert_from_mem(
SSL_CTX *ctx,
const char *pData,
int nData
){
BIO *in;
int rc = 1;
X509 *x = 0;
X509 *cert = 0;
in = BIO_new_mem_buf(pData, nData);
if( in==0 ) goto end_of_ucfm;
x = X509_new();
if( x==0 ) goto end_of_ucfm;
cert = PEM_read_bio_X509(in, &x, 0, 0);
if( cert==0 ) goto end_of_ucfm;
rc = SSL_CTX_use_certificate(ctx, x)<=0;
end_of_ucfm:
X509_free(x);
BIO_free(in);
return rc;
}
/*
** Read a PEM private key from memory and add it to an SSL_CTX.
** Return the number of errors.
*/
static int sslctx_use_pkey_from_mem(
SSL_CTX *ctx,
const char *pData,
int nData
){
int rc = 1;
BIO *in;
EVP_PKEY *pkey = 0;
in = BIO_new_mem_buf(pData, nData);
if( in==0 ) goto end_of_upkfm;
pkey = PEM_read_bio_PrivateKey(in, 0, 0, 0);
if( pkey==0 ) goto end_of_upkfm;
rc = SSL_CTX_use_PrivateKey(ctx, pkey)<=0;
EVP_PKEY_free(pkey);
end_of_upkfm:
BIO_free(in);
return rc;
}
/*
** Initialize the SSL library so that it is able to handle
** server-side connections. Invokes Malfunction() if there are
** any problems (so does not return on error).
**
** If zKeyFile and zCertFile are not NULL, then they are the names
** of disk files that hold the certificate and private-key for the
** server. If zCertFile is not NULL but zKeyFile is NULL, then
** zCertFile is assumed to be a concatenation of the certificate and
** the private-key in the PEM format.
**
** If zCertFile is "unsafe-builtin" then a built-in self-signed cert
** is used and zKeyFile is ignored.
**
** Error messages may contain the paths to the given files, but this
** function is called before the server starts listening for requests,
** so those will never be sent to clients.
*/
static void ssl_init_server(const char *zCertFile,
const char *zKeyFile){
if( tlsState.isInit==0 ){
const int useSelfSigned = zCertFile
&& 0==strcmp("unsafe-builtin", zCertFile);
SSL_library_init();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
tlsState.ctx = SSL_CTX_new(SSLv23_server_method());
if( tlsState.ctx==0 ){
ERR_print_errors_fp(stderr);
Malfunction(501, /* LOG: Error initializing the SSL Server */
"Error initializing the SSL server");
}
#if 0 /* Don't be overly restrictive. Some people still use older browsers */
SSL_CTX_set_min_proto_version(tlsState.ctx, TLS1_2_VERSION);
SSL_CTX_set_max_proto_version(tlsState.ctx, TLS1_3_VERSION);
SSL_CTX_set_cipher_list(tlsState.ctx,
"ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384");
SSL_CTX_set_options(tlsState.ctx,
SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_NO_COMPRESSION);
#endif
if( !useSelfSigned && zCertFile && zCertFile[0] ){
if( SSL_CTX_use_certificate_chain_file(tlsState.ctx,
zCertFile)!=1 ){
ERR_print_errors_fp(stderr);
Malfunction(502, /* LOG: Error loading CERT file */
"Error loading CERT file \"%s\"", zCertFile);
}
if( zKeyFile==0 ) zKeyFile = zCertFile;
if( SSL_CTX_use_PrivateKey_file(tlsState.ctx, zKeyFile,
SSL_FILETYPE_PEM)<=0 ){
ERR_print_errors_fp(stderr);
Malfunction(503, /* LOG: Error loading private key file */
"Error loading PRIVATE KEY from file \"%s\"",
zKeyFile);
}
}else if( useSelfSigned ){
if(sslctx_use_cert_from_mem(tlsState.ctx, sslSelfCert, -1)
|| sslctx_use_pkey_from_mem(tlsState.ctx, sslSelfPKey, -1) ){
Malfunction(504, /* LOG: Error loading self-signed cert */
"Error loading self-signed CERT");
}
}else{
Malfunction(505,"No certificate TLS specified"); /* LOG: No cert */
}
if( !SSL_CTX_check_private_key(tlsState.ctx) ){
Malfunction(506, /* LOG: private key does not match cert */
"PRIVATE KEY \"%s\" does not match CERT \"%s\"",
zKeyFile, zCertFile);
}
SSL_CTX_set_mode(tlsState.ctx, SSL_MODE_AUTO_RETRY);
tlsState.isInit = 2;
}else{
assert( tlsState.isInit==2 );
}
}
#endif /*ENABLE_TLS*/
/*
** Check to see if basic authorization credentials are provided for
** the user according to the information in zAuthFile. Return true
** if authorized. Return false if not authorized.
**
** File format:
**
** * Blank lines and lines that begin with '#' are ignored
** * "http-redirect" forces a redirect to HTTPS if not there already
** * "https-only" disallows operation in HTTP
** * "user NAME LOGIN:PASSWORD" checks to see if LOGIN:PASSWORD
** authorization credentials are provided, and if so sets the
** REMOTE_USER to NAME.
** * "realm TEXT" sets the realm to TEXT.
** * "anyone" bypasses authentication and allows anyone to see the
** files. Useful in combination with "http-redirect"
*/
static int CheckBasicAuthorization(const char *zAuthFile){
FILE *in;
char *zRealm = "unknown realm";
char *zLoginPswd;
char *zName;
char zLine[2000];
in = fopen(zAuthFile, "rb");
if( in==0 ){
NotFound(150); /* LOG: Cannot open -auth file */
return 0;
}
if( zAuthArg ) Decode64(zAuthArg);
while( fgets(zLine, sizeof(zLine), in) ){
char *zFieldName;
char *zVal;
zFieldName = GetFirstElement(zLine,&zVal);
if( zFieldName==0 || *zFieldName==0 ) continue;
if( zFieldName[0]=='#' ) continue;
RemoveNewline(zVal);
if( strcmp(zFieldName, "realm")==0 ){
zRealm = StrDup(zVal);
}else if( strcmp(zFieldName,"user")==0 ){
if( zAuthArg==0 ) continue;
zName = GetFirstElement(zVal, &zVal);
zLoginPswd = GetFirstElement(zVal, &zVal);
if( zLoginPswd==0 ) continue;
if( zAuthArg && strcmp(zAuthArg,zLoginPswd)==0 ){
zRemoteUser = StrDup(zName);
fclose(in);
return 1;
}
}else if( strcmp(zFieldName,"https-only")==0 ){
if( !useHttps ){
NotFound(160); /* LOG: http request on https-only page */
fclose(in);
return 0;
}
}else if( strcmp(zFieldName,"http-redirect")==0 ){
if( !useHttps ){
zHttpScheme = "https";
Redirect(zScript, 301, 1, 170); /* LOG: -auth redirect */
fclose(in);
return 0;
}
}else if( strcmp(zFieldName,"anyone")==0 ){
fclose(in);
return 1;
}else{
NotFound(180); /* LOG: malformed entry in -auth file */
fclose(in);
return 0;
}
}
fclose(in);
NotAuthorized(zRealm);
return 0;
}
/*
** Type for mapping file extensions to mimetypes and type-specific
** internal flags.
*/
typedef struct MimeTypeDef {
const char *zSuffix; /* The file suffix */
unsigned char size; /* Length of the suffix */
unsigned char flags; /* See the MTF_xxx flags macros */
const char *zMimetype; /* The corresponding mimetype */
} MimeTypeDef;
/* Flags for mimetype flags. These MUST match the values hard-coded in
** GetMimeType(). That function avoids the macros for space reasons. */
#define MTF_NOCGI 0x1 /* Never treat as CGI */
#define MTF_NOCHARSET 0x2 /* Elide charset=... from Content-Type */
/*
** Guess the mime-type of a document based on its name.
*/
const MimeTypeDef *GetMimeType(const char *zName, int nName){
const char *z;
int i;
int first, last;
int len;
char zSuffix[20];
/* A table of mimetypes based on file suffixes.
** Suffixes must be in sorted order so that we can do a binary
** search to find the mime-type
*/
static const MimeTypeDef aMime[] = {
{ "ai", 2, 0x00, "application/postscript" },
{ "aif", 3, 0x00, "audio/x-aiff" },
{ "aifc", 4, 0x00, "audio/x-aiff" },
{ "aiff", 4, 0x00, "audio/x-aiff" },
{ "arj", 3, 0x00, "application/x-arj-compressed" },
{ "asc", 3, 0x00, "text/plain" },
{ "asf", 3, 0x00, "video/x-ms-asf" },
{ "asx", 3, 0x00, "video/x-ms-asx" },
{ "au", 2, 0x00, "audio/ulaw" },
{ "avi", 3, 0x00, "video/x-msvideo" },
{ "bat", 3, 0x00, "application/x-msdos-program" },
{ "bcpio", 5, 0x00, "application/x-bcpio" },
{ "bin", 3, 0x00, "application/octet-stream" },
{ "br", 2, 0x00, "application/x-brotli" },
{ "c", 1, 0x00, "text/plain" },
{ "cc", 2, 0x00, "text/plain" },
{ "ccad", 4, 0x00, "application/clariscad" },
{ "cdf", 3, 0x00, "application/x-netcdf" },
{ "class", 5, 0x00, "application/octet-stream" },
{ "cod", 3, 0x00, "application/vnd.rim.cod" },
{ "com", 3, 0x00, "application/x-msdos-program" },
{ "cpio", 4, 0x00, "application/x-cpio" },
{ "cpt", 3, 0x00, "application/mac-compactpro" },
{ "csh", 3, 0x00, "application/x-csh" },
{ "css", 3, 0x00, "text/css" },
{ "dcr", 3, 0x00, "application/x-director" },
{ "deb", 3, 0x00, "application/x-debian-package" },
{ "dir", 3, 0x00, "application/x-director" },
{ "dl", 2, 0x00, "video/dl" },
{ "dms", 3, 0x00, "application/octet-stream" },
{ "doc", 3, 0x00, "application/msword" },
{ "drw", 3, 0x00, "application/drafting" },
{ "dvi", 3, 0x00, "application/x-dvi" },
{ "dwg", 3, 0x00, "application/acad" },
{ "dxf", 3, 0x00, "application/dxf" },
{ "dxr", 3, 0x00, "application/x-director" },
{ "eps", 3, 0x00, "application/postscript" },
{ "etx", 3, 0x00, "text/x-setext" },
{ "exe", 3, 0x00, "application/octet-stream" },
{ "ez", 2, 0x00, "application/andrew-inset" },
{ "f", 1, 0x00, "text/plain" },
{ "f90", 3, 0x00, "text/plain" },
{ "fli", 3, 0x00, "video/fli" },
{ "flv", 3, 0x00, "video/flv" },
{ "gif", 3, 0x02, "image/gif" },
{ "gl", 2, 0x00, "video/gl" },
{ "gtar", 4, 0x00, "application/x-gtar" },
{ "gz", 2, 0x00, "application/x-gzip" },
{ "hdf", 3, 0x00, "application/x-hdf" },
{ "hh", 2, 0x00, "text/plain" },
{ "hqx", 3, 0x00, "application/mac-binhex40" },
{ "h", 1, 0x00, "text/plain" },
{ "htm", 3, 0x00, "text/html" },
{ "html", 4, 0x00, "text/html" },
{ "ice", 3, 0x00, "x-conference/x-cooltalk" },
{ "ief", 3, 0x00, "image/ief" },
{ "iges", 4, 0x00, "model/iges" },
{ "igs", 3, 0x00, "model/iges" },
{ "ips", 3, 0x00, "application/x-ipscript" },
{ "ipx", 3, 0x00, "application/x-ipix" },
{ "jad", 3, 0x00, "text/vnd.sun.j2me.app-descriptor" },
{ "jar", 3, 0x00, "application/java-archive" },
{ "jp2" , 3, 0x02, "image/jp2" },
{ "jpe", 3, 0x02, "image/jpeg" },
{ "jpeg", 4, 0x02, "image/jpeg" },
{ "jpg", 3, 0x02, "image/jpeg" },
{ "js", 2, 0x00, "text/javascript" },
/* application/javascript is commonly used for JS, but the
** HTML spec says text/javascript is correct:
** https://html.spec.whatwg.org/multipage/scripting.html
** #scriptingLanguages:javascript-mime-type */
{ "json", 4, 0x00, "application/json" },
{ "kar", 3, 0x00, "audio/midi" },
{ "latex", 5, 0x00, "application/x-latex" },
{ "lha", 3, 0x00, "application/octet-stream" },
{ "lsp", 3, 0x00, "application/x-lisp" },
{ "lzh", 3, 0x02, "application/octet-stream" },
{ "m", 1, 0x00, "text/plain" },
{ "m3u", 3, 0x00, "audio/x-mpegurl" },
{ "man", 3, 0x00, "application/x-troff-man" },
{ "md", 2, 0x00, "text/plain" },
{ "me", 2, 0x00, "application/x-troff-me" },
{ "mesh", 4, 0x00, "model/mesh" },
{ "mid", 3, 0x00, "audio/midi" },
{ "midi", 4, 0x02, "audio/midi" },
{ "mif", 3, 0x00, "application/x-mif" },
{ "mime", 4, 0x00, "www/mime" },
{ "mjs", 3, 0x00, "text/javascript" /*ES6 module*/ },
{ "movie", 5, 0x00, "video/x-sgi-movie" },
{ "mov", 3, 0x02, "video/quicktime" },
{ "mp2", 3, 0x02, "audio/mpeg" },
{ "mp3", 3, 0x02, "audio/mpeg" },
{ "mpeg", 4, 0x02, "video/mpeg" },
{ "mpe", 3, 0x00, "video/mpeg" },
{ "mpga", 4, 0x00, "audio/mpeg" },
{ "mpg", 3, 0x02, "video/mpeg" },
{ "ms", 2, 0x00, "application/x-troff-ms" },
{ "msh", 3, 0x00, "model/mesh" },
{ "nc", 2, 0x00, "application/x-netcdf" },
{ "oda", 3, 0x00, "application/oda" },
{ "ogg", 3, 0x00, "application/ogg" },
{ "ogm", 3, 0x00, "application/ogg" },
{ "pbm", 3, 0x00, "image/x-portable-bitmap" },
{ "pdb", 3, 0x00, "chemical/x-pdb" },
{ "pdf", 3, 0x00, "application/pdf" },
{ "pgm", 3, 0x00, "image/x-portable-graymap" },
{ "pgn", 3, 0x00, "application/x-chess-pgn" },
{ "pgp", 3, 0x00, "application/pgp" },
{ "pl", 2, 0x00, "application/x-perl" },
{ "pm", 2, 0x00, "application/x-perl" },
{ "png", 3, 0x02, "image/png" },
{ "pnm", 3, 0x00, "image/x-portable-anymap" },
{ "pot", 3, 0x00, "application/mspowerpoint" },
{ "ppm", 3, 0x00, "image/x-portable-pixmap" },
{ "pps", 3, 0x00, "application/mspowerpoint" },
{ "ppt", 3, 0x00, "application/mspowerpoint" },
{ "ppz", 3, 0x00, "application/mspowerpoint" },
{ "pre", 3, 0x00, "application/x-freelance" },
{ "prt", 3, 0x00, "application/pro_eng" },
{ "ps", 2, 0x00, "application/postscript" },
{ "qt", 2, 0x00, "video/quicktime" },
{ "ra", 2, 0x00, "audio/x-realaudio" },
{ "ram", 3, 0x00, "audio/x-pn-realaudio" },
{ "rar", 3, 0x00, "application/x-rar-compressed" },
{ "ras", 3, 0x00, "image/cmu-raster" },
{ "rgb", 3, 0x00, "image/x-rgb" },
{ "rm", 2, 0x00, "audio/x-pn-realaudio" },
{ "roff", 4, 0x00, "application/x-troff" },
{ "rpm", 3, 0x00, "audio/x-pn-realaudio-plugin" },
{ "rtf", 3, 0x00, "text/rtf" },
{ "rtx", 3, 0x00, "text/richtext" },
{ "scm", 3, 0x00, "application/x-lotusscreencam" },
{ "set", 3, 0x00, "application/set" },
{ "sgml", 4, 0x00, "text/sgml" },
{ "sgm", 3, 0x00, "text/sgml" },
{ "sh", 2, 0x00, "application/x-sh" },
{ "shar", 4, 0x00, "application/x-shar" },
{ "silo", 4, 0x00, "model/mesh" },
{ "sit", 3, 0x00, "application/x-stuffit" },
{ "skd", 3, 0x00, "application/x-koan" },
{ "skm", 3, 0x00, "application/x-koan" },
{ "skp", 3, 0x00, "application/x-koan" },
{ "skt", 3, 0x00, "application/x-koan" },
{ "smi", 3, 0x00, "application/smil" },
{ "smil", 4, 0x00, "application/smil" },
{ "snd", 3, 0x00, "audio/basic" },
{ "sol", 3, 0x00, "application/solids" },
{ "spl", 3, 0x00, "application/x-futuresplash" },
{ "sql", 3, 0x00, "application/sql" },
{ "src", 3, 0x00, "application/x-wais-source" },
{ "step", 4, 0x00, "application/STEP" },
{ "stl", 3, 0x00, "application/SLA" },
{ "stp", 3, 0x00, "application/STEP" },
{ "sv4cpio", 7, 0x00, "application/x-sv4cpio" },
{ "sv4crc", 6, 0x00, "application/x-sv4crc" },
{ "svg", 3, 0x00, "image/svg+xml" },
{ "swf", 3, 0x00, "application/x-shockwave-flash" },
{ "t", 1, 0x00, "application/x-troff" },
{ "tar", 3, 0x00, "application/x-tar" },
{ "tcl", 3, 0x00, "application/x-tcl" },
{ "tex", 3, 0x00, "application/x-tex" },
{ "texi", 4, 0x00, "application/x-texinfo" },
{ "texinfo", 7, 0x00, "application/x-texinfo" },
{ "tgz", 3, 0x00, "application/x-tar-gz" },
{ "tiff", 4, 0x00, "image/tiff" },
{ "tif", 3, 0x00, "image/tiff" },
{ "tr", 2, 0x00, "application/x-troff" },
{ "tsi", 3, 0x00, "audio/TSP-audio" },
{ "tsp", 3, 0x00, "application/dsptype" },
{ "tsv", 3, 0x00, "text/tab-separated-values" },
{ "txt", 3, 0x00, "text/plain" },
{ "unv", 3, 0x00, "application/i-deas" },
{ "ustar", 5, 0x00, "application/x-ustar" },
{ "vcd", 3, 0x00, "application/x-cdlink" },
{ "vda", 3, 0x00, "application/vda" },
{ "viv", 3, 0x00, "video/vnd.vivo" },
{ "vivo", 4, 0x00, "video/vnd.vivo" },
{ "vrml", 4, 0x00, "model/vrml" },
{ "vsix", 4, 0x00, "application/vsix" },
{ "wasm", 4, 0x03, "application/wasm" },
{ "wav", 3, 0x00, "audio/x-wav" },
{ "wax", 3, 0x00, "audio/x-ms-wax" },
{ "wiki", 4, 0x00, "application/x-fossil-wiki" },
{ "wma", 3, 0x00, "audio/x-ms-wma" },
{ "wmv", 3, 0x00, "video/x-ms-wmv" },
{ "wmx", 3, 0x00, "video/x-ms-wmx" },
{ "wrl", 3, 0x00, "model/vrml" },
{ "wvx", 3, 0x00, "video/x-ms-wvx" },
{ "xbm", 3, 0x00, "image/x-xbitmap" },
{ "xhtml", 5, 0x00, "application/xhtml+xml" },
{ "xlc", 3, 0x00, "application/vnd.ms-excel" },
{ "xll", 3, 0x00, "application/vnd.ms-excel" },
{ "xlm", 3, 0x00, "application/vnd.ms-excel" },
{ "xls", 3, 0x00, "application/vnd.ms-excel" },
{ "xlw", 3, 0x00, "application/vnd.ms-excel" },
{ "xml", 3, 0x00, "text/xml" },
{ "xpm", 3, 0x00, "image/x-xpixmap" },
{ "xsl", 3, 0x00, "text/xml" },
{ "xslt", 4, 0x00, "text/xml" },
{ "xwd", 3, 0x00, "image/x-xwindowdump" },
{ "xyz", 3, 0x00, "chemical/x-pdb" },
{ "zip", 3, 0x00, "application/zip" },
};
for(i=nName-1; i>0 && zName[i]!='.'; i--){}
z = &zName[i+1];
len = nName - i;
if( len<(int)sizeof(zSuffix)-1 ){
strcpy(zSuffix, z);
for(i=0; zSuffix[i]; i++) zSuffix[i] = tolower(zSuffix[i]);
first = 0;
last = sizeof(aMime)/sizeof(aMime[0]);
while( first<=last ){
int c;
i = (first+last)/2;
c = strcmp(zSuffix, aMime[i].zSuffix);
if( c==0 ) return &aMime[i];
if( c<0 ){
last = i-1;
}else{
first = i+1;
}
}
}
return 0;
}
/*
** The following table contains 1 for all characters that are permitted in
** the part of the URL before the query parameters and fragment.
**
** Allowed characters: 0-9a-zA-Z,-./:_~
**
** Disallowed characters include: !"#$%&'()*+;<=>?@[\]^`{|}
*/
static const char allowedInName[] = {
/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xa xb xc xd xe xf */
/* 0x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 1x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 2x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
/* 3x */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
/* 4x */ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* 5x */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
/* 6x */ 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* 7x */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,
/* 8x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 9x */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* Ax */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* Bx */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* Cx */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* Dx */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* Ex */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* Fx */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
/*
** Remove all disallowed characters in the input string z[]. Convert any
** disallowed characters into "_".
**
** Note that the three character sequence "%XX" where X is any byte is
** converted into a single "_" character.
**
** Return the number of characters converted. An "%XX" -> "_" conversion
** counts as a single character.
*/
static int sanitizeString(char *z){
int nChange = 0;
while( *z ){
if( !allowedInName[*(unsigned char*)z] ){
char cNew = '_';
if( *z=='%' && z[1]!=0 && z[2]!=0 ){
int i;
if( z[1]=='2' ){
if( z[2]=='e' || z[2]=='E' ) cNew = '.';
if( z[2]=='f' || z[2]=='F' ) cNew = '/';
}
for(i=3; (z[i-2] = z[i])!=0; i++){}
}
*z = cNew;
nChange++;
}
z++;
}
return nChange;
}
/*
** Count the number of "/" characters in a string.
*/
static int countSlashes(const char *z){
int n = 0;
while( *z ) if( *(z++)=='/' ) n++;
return n;
}
#ifdef ENABLE_TLS
/*
** Create a new server-side codec. The argument is the socket's file
** descriptor from which the codec reads and writes. The returned
** memory must eventually be passed to tls_close_server().
*/
static void *tls_new_server(int iSocket){
TlsServerConn *pServer = malloc(sizeof(*pServer));
BIO *b = pServer ? BIO_new_socket(iSocket, 0) : NULL;
if( NULL==b ){
Malfunction(507,"Cannot allocate TlsServerConn."); /* LOG: TlsServerConn */
}
assert(NULL!=tlsState.ctx);
pServer->ssl = SSL_new(tlsState.ctx);
pServer->bio = b;
pServer->iSocket = iSocket;
SSL_set_bio(pServer->ssl, b, b);
SSL_accept(pServer->ssl);
return (void*)pServer;
}
/*
** Close a server-side code previously returned from tls_new_server().
*/
static void tls_close_server(void *pServerArg){
TlsServerConn *pServer = (TlsServerConn*)pServerArg;
SSL_free(pServer->ssl);
memset(pServer, 0, sizeof(TlsServerConn));
free(pServer);
}
static void tls_atexit(void){
/*
** Shutting down TLS can lead to spurious hung processes on some
** platforms/builds. See the long discussion on this at:
** https://sqlite.org/althttpd/forumpost/4dc31619341ce947
*/
if( inSignalHandler==0 && tlsState.sslCon!=0 ){
tls_close_server(tlsState.sslCon);
tlsState.sslCon = NULL;
}
}
#endif /* ENABLE_TLS */
/*
** Works like fgets():
**
** Read a single line of input into s[]. Ensure that s[] is zero-terminated.
** The s[] buffer is size bytes and so at most size-1 bytes will be read.
**
** Return a pointer to s[] on success, or NULL at end-of-input.
**
** If in TLS mode, the final argument is ignored and the TLS
** connection is read instead.
*/
static char *althttpd_fgets(char *s, int size, FILE *in){
if( useHttps!=2 ){
return fgets(s, size, in);
}
#ifdef ENABLE_TLS
assert(NULL!=tlsState.sslCon);
return tls_gets(tlsState.sslCon, s, size);
#else
Malfunction(508,"SSL not available"); /* LOG: SSL not available */
return NULL;
#endif
}
/*
** Works like fread() but may, depending on connection state, use
** libssl to read the data (in which case the final argument is
** ignored). The target buffer must be at least (sz*nmemb) bytes.
*/
static size_t althttpd_fread(void *tgt, size_t sz, size_t nmemb, FILE *in){
if( useHttps!=2 ){
return fread(tgt, sz, nmemb, in);
}
#ifdef ENABLE_TLS
assert(NULL!=tlsState.sslCon);
return tls_read_server(tlsState.sslCon, tgt, sz*nmemb);
#else
Malfunction(509,"SSL not available"); /* LOG: SSL not available */
return 0;
#endif
}
/*
** Works like fwrite() but may, depending on connection state, write to
** the active TLS connection (in which case the final argument is
** ignored).
**
*/
static size_t althttpd_fwrite(
void const *src, /* Buffer containing content to write */
size_t sz, /* Size of each element in the buffer */
size_t nmemb, /* Number of elements to write */
FILE *out /* Write on this stream */
){
if( useHttps!=2 ){
return fwrite(src, sz, nmemb, out);
}
#ifdef ENABLE_TLS
assert(NULL!=tlsState.sslCon);
return tls_write_server(tlsState.sslCon, src, sz*nmemb);
#else
Malfunction(510,"SSL not available"); /* LOG: SSL not available */
return 0;
#endif
}
/*
** In non-builtin-TLS mode, fflush()es the given FILE handle, else
** this is a no-op.
*/
static void althttpd_fflush(FILE *f){
if( useHttps!=2 ){
fflush(f);
}
}
/*
** Transfer nXfer bytes from in to out, after first discarding
** nSkip bytes from in. Increment the nOut global variable
** according to the number of bytes transferred.
**
** When running in built-in TLS mode the 2nd argument is ignored and
** output is instead sent via the TLS connection.
*/
static void xferBytes(FILE *in, FILE *out, int nXfer, int nSkip){
size_t n;
size_t got;
char zBuf[16384];
while( nSkip>0 ){
n = nSkip;
if( n>sizeof(zBuf) ) n = sizeof(zBuf);
got = fread(zBuf, 1, n, in);
if( got==0 ) break;
nSkip -= got;
}
while( nXfer>0 ){
n = nXfer;
if( n>sizeof(zBuf) ) n = sizeof(zBuf);
got = fread(zBuf, 1, n, in);
if( got==0 ) break;
althttpd_fwrite(zBuf, got, 1, out);
nOut += got;
nXfer -= got;
}
}
/*
** Send the text of the file named by zFile as the reply. Use the
** suffix on the end of the zFile name to determine the mimetype.
**
** Return 1 to omit making a log entry for the reply.
*/
static int SendFile(
const char *zFile, /* Name of the file to send */
int lenFile, /* Length of the zFile name in bytes */
struct stat *pStat /* Result of a stat() against zFile */
){
const char *zContentType;
time_t t;
FILE *in;
size_t szFilename;
char zETag[100];
const MimeTypeDef *pMimeType;
int bAddCharset = 1;
const char *zEncoding = 0;
struct stat statbuf;
char zGzFilename[2000];
pMimeType = GetMimeType(zFile, lenFile);
zContentType = pMimeType
? pMimeType->zMimetype : "application/octet-stream";
if( pMimeType && (MTF_NOCHARSET & pMimeType->flags) ){
bAddCharset = 0;
}
if( zPostData ){ free(zPostData); zPostData = 0; }
sprintf(zETag, "m%xs%x", (int)pStat->st_mtime, (int)pStat->st_size);
if( CompareEtags(zIfNoneMatch,zETag)==0
|| (zIfModifiedSince!=0
&& (t = ParseRfc822Date(zIfModifiedSince))>0
&& t>=pStat->st_mtime)
){
StartResponse("304 Not Modified");
nOut += DateTag("Last-Modified", pStat->st_mtime);
nOut += althttpd_printf("Cache-Control: max-age=%d" CRLF, mxAge);
nOut += althttpd_printf("ETag: \"%s\"" CRLF CRLF, zETag);
fflush(stdout);
MakeLogEntry(0, 470); /* LOG: ETag Cache Hit */
return 1;
}
if( rangeEnd<=0
&& zAcceptEncoding ){
szFilename = strlen(zFile);
if( szFilename < sizeof(zGzFilename)-10 ){
memcpy(zGzFilename, zFile, szFilename);
if( strstr(zAcceptEncoding,"br")!=0 ){
memcpy(zGzFilename + szFilename, ".br", 4);
if( access(zGzFilename, R_OK)==0 ){
memset(&statbuf, 0, sizeof(statbuf));
if( stat(zGzFilename, &statbuf)==0 ){
zEncoding = "br";
zFile = zGzFilename;
pStat = &statbuf;
}
}
}
if( !zEncoding && strstr(zAcceptEncoding,"gzip")!=0 ){
memcpy(zGzFilename + szFilename, ".gz", 4);
if( access(zGzFilename, R_OK)==0 ){
memset(&statbuf, 0, sizeof(statbuf));
if( stat(zGzFilename, &statbuf)==0 ){
zEncoding = "gzip";
zFile = zGzFilename;
pStat = &statbuf;
}
}
}
}
}
in = fopen(zFile,"rb");
if( in==0 ) NotFound(480); /* LOG: fopen() failed for static content */
if( rangeEnd>0 && rangeStart<pStat->st_size ){
StartResponse("206 Partial Content");
if( rangeEnd>=pStat->st_size ){
rangeEnd = pStat->st_size-1;
}
nOut += althttpd_printf("Content-Range: bytes %d-%d/%d" CRLF,
rangeStart, rangeEnd, (int)pStat->st_size);
pStat->st_size = rangeEnd + 1 - rangeStart;
}else{
StartResponse("200 OK");
rangeStart = 0;
}
nOut += DateTag("Last-Modified", pStat->st_mtime);
if( enableSAB ){
/* The following two HTTP reply headers are required if javascript
** is to make use of SharedArrayBuffer */
nOut += althttpd_printf("Cross-Origin-Opener-Policy: same-origin" CRLF);
nOut += althttpd_printf("Cross-Origin-Embedder-Policy: require-corp" CRLF);
}
nOut += althttpd_printf("Cache-Control: max-age=%d" CRLF, mxAge);
nOut += althttpd_printf("ETag: \"%s\"" CRLF, zETag);
nOut += althttpd_printf("Content-type: %s%s" CRLF,zContentType,
bAddCharset ? "; charset=utf-8" : "");
if( zEncoding ){
nOut += althttpd_printf("Content-encoding: %s" CRLF, zEncoding);
}
nOut += althttpd_printf("Content-length: %d" CRLF CRLF,(int)pStat->st_size);
fflush(stdout);
if( strcmp(zMethod,"HEAD")==0 ){
MakeLogEntry(0, 2); /* LOG: Normal HEAD reply */
fclose(in);
fflush(stdout);
return 1;
}
#ifdef linux
if( 2!=useHttps ){
off_t offset = rangeStart;
nOut += sendfile(fileno(stdout), fileno(in), &offset, pStat->st_size);
}else
#endif
{
xferBytes(in, stdout, (int)pStat->st_size, rangeStart);
}
fclose(in);
return 0;
}
/*
** Streams all contents from in to out. If in TLS mode, the
** output stream is ignored and the output instead goes
** to the TLS channel.
*/
static void stream_file(FILE * const in, FILE * const out){
enum { STREAMBUF_SIZE = 1024 * 4 };
char streamBuf[STREAMBUF_SIZE];
size_t n;
while( (n = fread(streamBuf, 1,sizeof(STREAMBUF_SIZE),in)) ){
althttpd_fwrite(streamBuf, 1, n, out);
}
}
/*
** A CGI or SCGI script has run and is sending its reply back across
** the channel "in". Process this reply into an appropriate HTTP reply.
** Close the "in" channel when done.
**
** If isNPH is true, the input is assumed to be from a
** non-parsed-header CGI and is passed on as-is to stdout or the TLS
** layer, depending on the connection state.
*/
static void CgiHandleReply(FILE *in, int isNPH){
int seenContentLength = 0; /* True if Content-length: header seen */
int contentLength = 0; /* The content length */
size_t nRes = 0; /* Bytes of payload */
size_t nMalloc = 0; /* Bytes of space allocated to aRes */
char *aRes = 0; /* Payload */
int c; /* Next character from in */
char *z; /* Pointer to something inside of zLine */
int iStatus = 0; /* Reply status code */
char zLine[1000]; /* One line of reply from the CGI script */
/* Set a 1-hour timeout, so that we can implement Hanging-GET or
** long-poll style CGIs. The RLIMIT_CPU will serve as a safety
** to help prevent a run-away CGI */
SetTimeout(60*60, 800); /* LOG: CGI Handler timeout */
if( isNPH ){
/*
** Non-parsed-header output: simply pipe it out as-is. We
** need to go through this routine, instead of simply exec()'ing,
** in order to go through the TLS output channel.
*/
stream_file(in, stdout);
fclose(in);
return;
}
while( fgets(zLine,sizeof(zLine),in) && !isspace((unsigned char)zLine[0]) ){
if( strncasecmp(zLine,"Location:",9)==0 ){
StartResponse("302 Redirect");
RemoveNewline(zLine);
z = &zLine[10];
while( isspace(*(unsigned char*)z) ){ z++; }
nOut += althttpd_printf("Location: %s" CRLF,z);
rangeEnd = 0;
}else if( strncasecmp(zLine,"Status:",7)==0 ){
int i;
for(i=7; isspace((unsigned char)zLine[i]); i++){}
strncpy(zReplyStatus, &zLine[i], 3);
zReplyStatus[3] = 0;
iStatus = atoi(zReplyStatus);
if( rangeEnd==0 || (iStatus!=200 && iStatus!=206) ){
if( iStatus==418 ){
/* If a CGI returns a status code of 418 ("I'm a teapot", rfc2324)
** that is a signal from the CGI to althttpd that the request was
** abuse - for example an attempted SQL injection attack or
** similar. */
BlockIPAddress();
ServiceUnavailable(903); /* LOG: CGI reports abuse */
}
nOut += althttpd_printf("%s %s", zProtocol, &zLine[i]);
rangeEnd = 0;
statusSent = 1;
}
}else if( strncasecmp(zLine, "Content-length:", 15)==0 ){
seenContentLength = 1;
contentLength = atoi(zLine+15);
}else if( strncasecmp(zLine, "X-Robot:", 8)==0 ){
isRobot = (atoi(&zLine[8])!=0)+1;
}else{
size_t nLine = strlen(zLine);
if( nRes+nLine >= nMalloc ){
nMalloc += nMalloc + nLine*2;
aRes = realloc(aRes, nMalloc+1);
if( aRes==0 ){
Malfunction(600, /* LOG: OOM */
"Out of memory: %llu bytes",
(long long unsigned int)nMalloc);
}
}
memcpy(aRes+nRes, zLine, nLine);
nRes += nLine;
}
}
/* Copy everything else thru without change or analysis.
*/
if( rangeEnd>0 && seenContentLength && rangeStart<contentLength ){
StartResponse("206 Partial Content");
if( rangeEnd>=contentLength ){
rangeEnd = contentLength-1;
}
nOut += althttpd_printf("Content-Range: bytes %d-%d/%d" CRLF,
rangeStart, rangeEnd, contentLength);
contentLength = rangeEnd + 1 - rangeStart;
}else{
StartResponse("200 OK");
}
if( nRes>0 ){
aRes[nRes] = 0;
althttpd_fwrite(aRes, nRes, 1, stdout);
nOut += nRes;
nRes = 0;
}
if( iStatus==304 ){
nOut += althttpd_printf(CRLF CRLF);
}else if( seenContentLength ){
nOut += althttpd_printf("Content-length: %d" CRLF CRLF, contentLength);
xferBytes(in, stdout, contentLength, rangeStart);
}else{
while( (c = getc(in))!=EOF ){
if( nRes>=nMalloc ){
nMalloc = nMalloc*2 + 1000;
aRes = realloc(aRes, nMalloc+1);
if( aRes==0 ){
Malfunction(610, /* LOG: OOM */
"Out of memory: %llu bytes",
(long long unsigned int)nMalloc);
}
}
aRes[nRes++] = c;
}
if( nRes ){
aRes[nRes] = 0;
nOut += althttpd_printf("Content-length: %d" CRLF CRLF, (int)nRes);
nOut += althttpd_fwrite(aRes, nRes, 1, stdout);
}else{
nOut += althttpd_printf("Content-length: 0" CRLF CRLF);
}
}
free(aRes);
fclose(in);
}
/*
** Send an SCGI request to a host identified by zFile and process the
** reply.
*/
static void SendScgiRequest(const char *zFile, const char *zScript){
FILE *in;
FILE *s;
char *z;
char *zHost;
char *zPort = 0;
char *zRelight = 0;
char *zFallback = 0;
int rc;
int iSocket = -1;
struct addrinfo hints;
struct addrinfo *ai = 0;
struct addrinfo *p;
char *zHdr;
size_t nHdr = 0;
size_t nHdrAlloc;
int i;
char zLine[1000];
char zExtra[1000];
in = fopen(zFile, "rb");
if( in==0 ){
Malfunction(700, "cannot open \"%s\"\n", zFile); /* LOG: cannot open file */
}
if( fgets(zLine, sizeof(zLine)-1, in)==0 ){
Malfunction(701, "cannot read \"%s\"\n", zFile); /* LOG: cannot read file */
}
if( strncmp(zLine,"SCGI ",5)!=0 ){
Malfunction(702, /* LOG: bad SCGI spec */
"misformatted SCGI spec \"%s\"\n", zFile);
}
z = zLine+5;
zHost = GetFirstElement(z,&z);
zPort = GetFirstElement(z,0);
if( zHost==0 || zHost[0]==0 || zPort==0 || zPort[0]==0 ){
Malfunction(703, /* LOG: bad SCGI spec (2) */
"misformatted SCGI spec \"%s\"\n", zFile);
}
while( fgets(zExtra, sizeof(zExtra)-1, in) ){
char *zCmd = GetFirstElement(zExtra,&z);
if( zCmd==0 ) continue;
if( zCmd[0]=='#' ) continue;
RemoveNewline(z);
if( strcmp(zCmd, "relight:")==0 ){
free(zRelight);
zRelight = StrDup(z);
continue;
}
if( strcmp(zCmd, "fallback:")==0 ){
free(zFallback);
zFallback = StrDup(z);
continue;
}
Malfunction(704, /* LOG: Unrecognized line in SCGI spec */
"unrecognized line in SCGI spec: \"%s %s\"\n",
zCmd, z ? z : "");
}
fclose(in);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
rc = getaddrinfo(zHost,zPort,&hints,&ai);
if( rc ){
Malfunction(705, /* LOG: Cannot resolve SCGI server name */
"cannot resolve SCGI server name %s:%s\n%s\n",
zHost, zPort, gai_strerror(rc));
}
while(1){ /* Exit via break */
for(p=ai; p; p=p->ai_next){
iSocket = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if( iSocket<0 ) continue;
if( connect(iSocket,p->ai_addr,p->ai_addrlen)>=0 ) break;
close(iSocket);
}
if( iSocket<0 || (s = fdopen(iSocket,"r+"))==0 ){
if( iSocket>=0 ) close(iSocket);
if( zRelight ){
rc = system(zRelight);
if( rc ){
Malfunction(721, /* LOG: SCGI relight failed */
"Relight failed with %d: \"%s\"\n",
rc, zRelight);
}
free(zRelight);
zRelight = 0;
sleep(1);
continue;
}
if( zFallback ){
struct stat statbuf;
int rc;
memset(&statbuf, 0, sizeof(statbuf));
if( chdir(zDir) ){
char zBuf[1000];
Malfunction(720, /* LOG: chdir() failed */
"cannot chdir to [%s] from [%s]",
zDir, getcwd(zBuf,999));
}
rc = stat(zFallback, &statbuf);
if( rc==0 && S_ISREG(statbuf.st_mode) && access(zFallback,R_OK)==0 ){
closeConnection = 1;
rc = SendFile(zFallback, (int)strlen(zFallback), &statbuf);
free(zFallback);
althttpd_exit(0);
}else{
Malfunction(706, /* LOG: bad SCGI fallback */
"bad fallback file: \"%s\"\n", zFallback);
}
}
Malfunction(707, /* LOG: Cannot open socket to SCGI */
"cannot open socket to SCGI server %s\n",
zScript);
}
break;
}
nHdrAlloc = 0;
zHdr = 0;
if( zContentLength==0 ) zContentLength = "0";
ComputeRequestUri();
zScgi = "1";
for(i=0; i<(int)(sizeof(cgienv)/sizeof(cgienv[0])); i++){
int n1, n2;
if( cgienv[i].pzEnvValue[0]==0 ) continue;
n1 = (int)strlen(cgienv[i].zEnvName);
n2 = (int)strlen(*cgienv[i].pzEnvValue);
if( n1+n2+2+nHdr >= nHdrAlloc ){
nHdrAlloc = nHdr + n1 + n2 + 1000;
zHdr = realloc(zHdr, nHdrAlloc);
if( zHdr==0 ){
Malfunction(708, "out of memory"); /* LOG: OOM */
}
}
memcpy(zHdr+nHdr, cgienv[i].zEnvName, n1);
nHdr += n1;
zHdr[nHdr++] = 0;
memcpy(zHdr+nHdr, *cgienv[i].pzEnvValue, n2);
nHdr += n2;
zHdr[nHdr++] = 0;
}
zScgi = 0;
fprintf(s,"%d:",(int)nHdr);
fwrite(zHdr, 1, nHdr, s);
fprintf(s,",");
free(zHdr);
if( nPostData>0 ){
size_t wrote = 0;
while( wrote<(size_t)nPostData ){
size_t n = fwrite(zPostData+wrote, 1, nPostData-wrote, s);
if( n<=0 ) break;
wrote += n;
}
free(zPostData);
zPostData = 0;
nPostData = 0;
}
fflush(s);
CgiHandleReply(s, 0);
}
/*
** If running in builtin TLS mode, initializes the SSL I/O
** state and returns 1, else does nothing and returns 0.
*/
static int tls_init_conn(int iSocket){
#ifdef ENABLE_TLS
if( 2==useHttps ){
/*assert(NULL==tlsState.sslCon);*/
if( NULL==tlsState.sslCon ){
tlsState.sslCon = (TlsServerConn *)tls_new_server(iSocket);
if( NULL==tlsState.sslCon ){
Malfunction(512, /* LOG: TLS context */
"Could not instantiate TLS context.");
}
atexit(tls_atexit);
}
return 1;
}
#else
if( 0==iSocket ){/*unused arg*/}
#endif
return 0;
}
static void tls_close_conn(void){
#ifdef ENABLE_TLS
if( tlsState.sslCon ){
tls_close_server(tlsState.sslCon);
tlsState.sslCon = NULL;
}
#endif
}
/*
** Check to see if zRemoteAddr is disallowed. Return true if it is
** disallowed and false if not.
**
** zRemoteAddr is disallowed if:
**
** * The zIPShunDir variable is not NULL
**
** * zIPShunDir is the name of a directory
**
** * There is a file in zIPShunDir whose name is exactly zRemoteAddr
** and that is N bytes in size.
**
** * N==0 or the mtime of the file is less than N*BANISH_TIME seconds
** ago.
**
** If N>0 and the mtime is greater than N*5*BANISH_TIME seconds
** (25 minutes per byte, by default) old, then the file is deleted.
**
** The size of the file determines how long the embargo is suppose to
** last. A zero-byte file embargos forever. Otherwise, the embargo
** is for BANISH_TIME bytes for each byte in the file.
*/
static int DisallowedRemoteAddr(void){
char zFullname[1000];
size_t nIPShunDir;
size_t nRemoteAddr;
int rc;
struct stat statbuf;
time_t now;
if( zIPShunDir==0 ) return 0;
if( zRemoteAddr==0 ) return 0;
if( zIPShunDir[0]!='/' ){
Malfunction(910, /* LOG: argument to --ipshun should be absolute path */
"The --ipshun directory should have an absolute path");
}
nIPShunDir = strlen(zIPShunDir);
while( nIPShunDir>0 && zIPShunDir[nIPShunDir-1]=='/' ) nIPShunDir--;
nRemoteAddr = strlen(zRemoteAddr);
if( nIPShunDir + nRemoteAddr + 2 >= sizeof(zFullname) ){
Malfunction(912, /* LOG: RemoteAddr filename too big */
"RemoteAddr filename too big");
}
if( zRemoteAddr[0]==0
|| zRemoteAddr[0]=='.'
|| strchr(zRemoteAddr,'/')!=0
){
Malfunction(913, /* LOG: RemoteAddr contains suspicious characters */
"RemoteAddr contains suspicious characters");
}
memcpy(zFullname, zIPShunDir, nIPShunDir);
zFullname[nIPShunDir] = '/';
memcpy(zFullname+nIPShunDir+1, zRemoteAddr, nRemoteAddr+1);
memset(&statbuf, 0, sizeof(statbuf));
rc = stat(zFullname, &statbuf);
if( rc ) return 0; /* No such file, hence no restrictions */
if( statbuf.st_size==0 ) return 1; /* Permanently banned */
time(&now);
if( statbuf.st_size*BANISH_TIME + statbuf.st_mtime >= now ){
return 1; /* Currently under a ban */
}
if( statbuf.st_size*5*BANISH_TIME + statbuf.st_mtime < now ){
unlink(zFullname);
}
return 0;
}
/*
** This routine processes a single HTTP request on standard input and
** sends the reply to standard output. If the argument is 1 it means
** that we are should close the socket without processing additional
** HTTP requests after the current request finishes. 0 means we are
** allowed to keep the connection open and to process additional requests.
** This routine may choose to close the connection even if the argument
** is 0.
**
** If the connection should be closed, this routine calls exit() and
** thus never returns. If this routine does return it means that another
** HTTP request may appear on the wire.
**
** socketId must be 0 (if running via xinetd/etc) or the socket ID
** accept()ed by http_server(). It is only used for built-in TLS
** mode.
*/
void ProcessOneRequest(int forceClose, int socketId){
int i, j, j0;
char *z; /* Used to parse up a string */
struct stat statbuf; /* Information about the file to be retrieved */
FILE *in; /* For reading from CGI scripts */
#ifdef LOG_HEADER
FILE *hdrLog = 0; /* Log file for complete header content */
#endif
char zLine[10000]; /* A buffer for input lines or forming names */
const MimeTypeDef *pMimeType = 0; /* URI's mimetype */
size_t sz = 0;
struct tm vTm; /* Timestamp for zExpLogFile */
clock_gettime(ALTHTTPD_CLOCK_ID, &tsBeginTime);
gettimeofday(&beginTime, 0);
if( zLogFile ){
assert(beginTime.tv_sec > 0);
gmtime_r(&beginTime.tv_sec, &vTm);
sz = strftime(zExpLogFile, sizeof(zExpLogFile), zLogFile, &vTm);
}
if( sz==0 || sz>=sizeof(zExpLogFile)-2 ){
/* Invalid zExpLogFile name */
zExpLogFile[0] = 0;
}
/* Must see the initial header within 10 seconds for the first request.
** Allow no more than 5 seconds for subsequent headers. Keep the second
** timeout short to avoid lingering children.
*/
if( useTimeout ){
if( nRequest>0 ){
SetTimeout(5, 801); /* LOG: Timeout request header (1+) */
}else{
SetTimeout(10, 802); /* LOG: Timeout request header (0) */
}
}
/* Change directories to the root of the HTTP filesystem
*/
if( chdir(zRoot[0] ? zRoot : "/")!=0 ){
char zBuf[1000];
Malfunction(190, /* LOG: chdir() failed */
"cannot chdir to [%s] from [%s]",
zRoot, getcwd(zBuf,sizeof(zBuf)-1));
}
nRequest++;
tls_init_conn(socketId);
/* Get the first line of the request and parse out the
** method, the script and the protocol.
*/
omitLog = 1;
if( althttpd_fgets(zLine,sizeof(zLine),stdin)==0 ){
althttpd_exit(0);
}
omitLog = 0;
nIn += (i = (int)strlen(zLine));
/* Parse the first line of the HTTP request */
zMethod = StrDup(GetFirstElement(zLine,&z));
zRealScript = zScript = StrDup(GetFirstElement(z,&z));
zProtocol = StrDup(GetFirstElement(z,&z));
if( zProtocol==0
|| strncmp(zProtocol,"HTTP/",5)!=0
|| strlen(zProtocol)!=8
|| i>9990
){
zProtocol = 0;
if( i<=9990 ){
StartResponse("400 Bad Request");
nOut += althttpd_printf(
"Content-type: text/plain; charset=utf-8" CRLF
CRLF
"This server does not understand the requested protocol\n"
);
MakeLogEntry(0, 200); /* LOG: bad protocol in HTTP header */
}else{
StartResponse("414 URI Too Long");
nOut += althttpd_printf(
"Content-type: text/plain; charset=utf-8" CRLF
CRLF
"URI too long\n"
);
MakeLogEntry(0, 201); /* LOG: bad protocol in HTTP header */
}
althttpd_exit(0);
}
if( zScript[0]!='/' ) NotFound(210); /* LOG: Empty request URI */
while( zScript[1]=='/' ){
zScript++;
zRealScript++;
}
if( forceClose ){
closeConnection = 1;
}else if( zProtocol[5]<'1' || zProtocol[7]<'1' ){
closeConnection = 1;
}
/* This very simple server only understands the GET, POST
** and HEAD methods
*/
if( strcmp(zMethod,"GET")!=0 && strcmp(zMethod,"POST")!=0
&& strcmp(zMethod,"HEAD")!=0 ){
StartResponse("501 Not Implemented");
nOut += althttpd_printf(
"Content-type: text/plain; charset=utf-8" CRLF
CRLF
"The %s method is not implemented on this server.\n",
zMethod);
MakeLogEntry(0, 220); /* LOG: Unknown request method */
althttpd_exit(0);
}
/* If there is a log file (if zLogFile!=0) and if the pathname in
** the first line of the http request contains the magic string
** "FullHeaderLog" then write the complete header text into the
** file %s(zLogFile)-hdr. Overwrite the file. This is for protocol
** debugging only and is only enabled if althttpd is compiled with
** the -DLOG_HEADER=1 option.
*/
#ifdef LOG_HEADER
if( zLogFile
&& strstr(zScript,"FullHeaderLog")!=0
&& strlen(zLogFile)<sizeof(zLine)-50
){
sprintf(zLine, "%s-hdr", zLogFile);
hdrLog = fopen(zLine, "wb");
}
#endif
/* Get all the optional fields that follow the first line.
*/
zCookie = 0;
zAuthType = 0;
zRemoteUser = 0;
zReferer = 0;
zIfNoneMatch = 0;
zIfModifiedSince = 0;
zContentLength = 0;
rangeEnd = 0;
while( althttpd_fgets(zLine,sizeof(zLine),stdin) ){
char *zFieldName;
char *zVal;
#ifdef LOG_HEADER
if( hdrLog ) fprintf(hdrLog, "%s", zLine);
#endif
nIn += strlen(zLine);
zFieldName = GetFirstElement(zLine,&zVal);
if( zFieldName==0 || *zFieldName==0 ) break;
RemoveNewline(zVal);
if( strcasecmp(zFieldName,"User-Agent:")==0 ){
zAgent = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Accept:")==0 ){
zAccept = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Accept-Encoding:")==0 ){
zAcceptEncoding = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Content-length:")==0 ){
zContentLength = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Content-type:")==0 ){
zContentType = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Referer:")==0 ){
zReferer = StrDup(zVal);
if( strstr(zVal, "devids.net/")!=0 ){ zReferer = "devids.net.smut";
Forbidden(230); /* LOG: Referrer is devids.net */
}
}else if( strcasecmp(zFieldName,"Cookie:")==0 ){
zCookie = StrAppend(zCookie,"; ",zVal);
}else if( strcasecmp(zFieldName,"Connection:")==0 ){
if( strcasecmp(zVal,"close")==0 ){
closeConnection = 1;
}else if( !forceClose && strcasecmp(zVal, "keep-alive")==0 ){
closeConnection = 0;
}
}else if( strcasecmp(zFieldName,"Host:")==0 ){
int inSquare = 0;
char c;
if( sanitizeString(zVal) ){
Forbidden(240); /* LOG: Illegal content in HOST: parameter */
}
zHttpHost = StrDup(zVal);
zServerPort = zServerName = StrDup(zHttpHost);
while( zServerPort && (c = *zServerPort)!=0
&& (c!=':' || inSquare) ){
if( c=='[' ) inSquare = 1;
if( c==']' ) inSquare = 0;
zServerPort++;
}
if( zServerPort && *zServerPort ){
*zServerPort = 0;
zServerPort++;
}
if( zRealPort ){
zServerPort = StrDup(zRealPort);
}
}else if( strcasecmp(zFieldName,"Authorization:")==0 ){
zAuthType = GetFirstElement(StrDup(zVal), &zAuthArg);
}else if( strcasecmp(zFieldName,"If-None-Match:")==0 ){
zIfNoneMatch = StrDup(zVal);
}else if( strcasecmp(zFieldName,"If-Modified-Since:")==0 ){
zIfModifiedSince = StrDup(zVal);
}else if( strcasecmp(zFieldName,"Range:")==0
&& strcmp(zMethod,"GET")==0 ){
int x1 = 0, x2 = 0;
int n = sscanf(zVal, "bytes=%d-%d", &x1, &x2);
if( n==2 && x1>=0 && x2>=x1 ){
rangeStart = x1;
rangeEnd = x2;
}else if( n==1 && x1>0 ){
rangeStart = x1;
rangeEnd = 0x7fffffff;
}
}
}
#ifdef LOG_HEADER
if( hdrLog ) fclose(hdrLog);
#endif
/* Disallow requests from certain clients */
if( zAgent ){
const char *azDisallow[] = {
"Amazonbot",
"Windows 9",
"Download Master",
"Ezooms/",
"DotBot",
"HTTrace",
"AhrefsBot",
"MicroMessenger",
"OPPO A33 Build",
"SemrushBot",
"MegaIndex.ru",
"MJ12bot",
"Chrome/0.A.B.C",
"Neevabot/",
"BLEXBot/",
"Synapse",
};
size_t ii;
for(ii=0; ii<sizeof(azDisallow)/sizeof(azDisallow[0]); ii++){
if( strstr(zAgent,azDisallow[ii])!=0 ){
Forbidden(250); /* LOG: Disallowed user agent */
}
}
#if 0
/* Spider attack from 2019-04-24 */
if( strcmp(zAgent,
"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 "
"(KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36")==0 ){
Forbidden(251); /* LOG: Disallowed user agent (20190424) */
}
#endif
}
#if 0
if( zReferer ){
static const char *azDisallow[] = {
"skidrowcrack.com",
"hoshiyuugi.tistory.com",
"skidrowgames.net",
};
int i;
for(i=0; i<sizeof(azDisallow)/sizeof(azDisallow[0]); i++){
if( strstr(zReferer, azDisallow[i])!=0 ){
NotFound(260); /* LOG: Disallowed referrer */
}
}
}
#endif
/* Make an extra effort to get a valid server name and port number.
** Only Netscape provides this information. If the browser is
** Internet Explorer, then we have to find out the information for
** ourselves.
*/
if( zServerName==0 ){
zServerName = SafeMalloc( 100 );
gethostname(zServerName,100);
}
if( zServerPort==0 || *zServerPort==0 ){
zServerPort = zRealPort ? zRealPort : DEFAULT_PORT;
}
/* Remove the query string from the end of the requested file.
*/
for(z=zScript; *z && *z!='?'; z++){}
if( *z=='?' ){
zQuerySuffix = StrDup(z);
*z = 0;
#if 0
if( (zReferer==0 || zReferer[0]==0)
&& strncmp(zQuerySuffix+1, "w=%2", 4)==0
){
NotFound(261); /* LOG: Spider attack */
}
#endif
#if 0
/* Chinese spider attack against the SQLite Forum. 2024-07-25 */
if( (zReferer==0 || zReferer[0]==0)
&& strstr(zScript,"forum/timeline")!=0
&& strstr(&zQuerySuffix[1],"y=a")!=0
&& ( strstr(&zQuerySuffix[1],"a=20")!=0
|| strstr(&zQuerySuffix[1],"b=20")!=0
|| strstr(&zQuerySuffix[1],"&c=")!=0
|| (zQuerySuffix[1]=='c' && zQuerySuffix[2]=='=') )
){
Forbidden(262); /* LOG: Chinese forum timeline spider */
}
#endif
}else{
zQuerySuffix = "";
}
zQueryString = *zQuerySuffix ? &zQuerySuffix[1] : zQuerySuffix;
/* Create either a memory buffer to hold the POST query data */
if( zMethod[0]=='P' && zContentLength!=0 ){
size_t len = atoi(zContentLength);
if( len>MAX_CONTENT_LENGTH ){
StartResponse("500 Request too large");
nOut += althttpd_printf(
"Content-type: text/plain; charset=utf-8" CRLF
CRLF
"Too much POST data\n"
);
MakeLogEntry(0, 270); /* LOG: Request too large */
althttpd_exit(0);
}
rangeEnd = 0;
zPostData = SafeMalloc( len+1 );
SetTimeout(15 + len/2000, 803); /* LOG: Timeout POST data */
nPostData = althttpd_fread(zPostData,1,len,stdin);
nIn += nPostData;
}
/* Make sure the running time is not too great */
SetTimeout(30, 804); /* LOG: Timeout decode HTTP request */
/* Convert all unusual characters in the script name into "_".
**
** This is a defense against various attacks, XSS attacks in particular.
*/
sanitizeString(zScript);
/* Refuse to process the request if the IP address has been banished */
if( zIPShunDir && DisallowedRemoteAddr() ){
ServiceUnavailable(901); /* LOG: Prohibited remote IP address */
}
/* Do not allow "/." or "/-" to to occur anywhere in the entity name.
** This prevents attacks involving ".." and also allows us to create
** files and directories whose names begin with "-" or "." which are
** invisible to the webserver.
**
** Exception: Allow the "/.well-known/" prefix in accordance with
** RFC-5785.
*/
for(z=zScript; *z; z++){
if( *z=='/' && (z[1]=='.' || z[1]=='-') ){
if( strncmp(zScript,"/.well-known/",13)==0 && (z[1]!='.' || z[2]!='.') ){
/* Exception: Allow "/." and "/-" for URLs that being with
** "/.well-known/". But do not allow "/..". */
continue;
}
NotFound(300); /* LOG: Path element begins with "." or "-" */
}
}
/* Figure out what the root of the filesystem should be. If the
** HTTP_HOST parameter exists (stored in zHttpHost) then remove the
** port number from the end (if any), convert all characters to lower
** case, and convert non-alphanumber characters (including ".") to "_".
** Then try to find a directory with that name and the extension .website.
** If not found, look for "default.website".
*/
if( zScript[0]!='/' ){
NotFound(310); /* LOG: URI does not start with "/" */
}
if( strlen(zRoot)+40 >= sizeof(zLine) ){
NotFound(320); /* LOG: URI too long */
}
if( zHttpHost==0 || zHttpHost[0]==0 ){
NotFound(330); /* LOG: Missing HOST: parameter */
}else if( strlen(zHttpHost)+strlen(zRoot)+10 >= sizeof(zLine) ){
NotFound(340); /* LOG: HOST parameter too long */
}else{
sprintf(zLine, "%s/%s", zRoot, zHttpHost);
for(i=strlen(zRoot)+1; zLine[i] && zLine[i]!=':'; i++){
unsigned char c = (unsigned char)zLine[i];
if( !isalnum(c) ){
if( c=='.' && (zLine[i+1]==0 || zLine[i+1]==':') ){
/* If the client sent a FQDN with a "." at the end
** (example: "sqlite.org." instead of just "sqlite.org") then
** omit the final "." from the document root directory name */
break;
}
zLine[i] = '_';
}else if( isupper(c) ){
zLine[i] = tolower(c);
}
}
strcpy(&zLine[i], ".website");
}
if( stat(zLine,&statbuf) || !S_ISDIR(statbuf.st_mode) ){
sprintf(zLine, "%s/default.website", zRoot);
if( stat(zLine,&statbuf) || !S_ISDIR(statbuf.st_mode) ){
if( standalone ){
sprintf(zLine, "%s", zRoot);
}else{
NotFound(350); /* LOG: *.website permissions */
}
}
}
zHome = StrDup(zLine);
/* Change directories to the root of the HTTP filesystem
*/
if( chdir(zHome)!=0 ){
char zBuf[1000];
Malfunction(360, /* LOG: chdir() failed */
"cannot chdir to [%s] from [%s]",
zHome, getcwd(zBuf,999));
}
/* Locate the file in the filesystem. We might have to append
** a name like "/home" or "/index.html" or "/index.cgi" in order
** to find it. Any excess path information is put into the
** zPathInfo variable.
*/
j = j0 = (int)strlen(zLine);
i = 0;
while( zScript[i] ){
while( zScript[i] && (i==0 || zScript[i]!='/') ){
zLine[j] = zScript[i];
i++; j++;
}
zLine[j] = 0;
/* fprintf(stderr, "searching [%s]...\n", zLine); */
if( stat(zLine,&statbuf)!=0 ){
int stillSearching = 1;
while( stillSearching && i>0 && j>j0 ){
while( j>j0 && zLine[j-1]!='/' ){ j--; }
strcpy(&zLine[j-1], "/not-found.html");
if( stat(zLine,&statbuf)==0
&& S_ISREG(statbuf.st_mode)
&& access(zLine,R_OK)==0
){
zRealScript = StrDup(&zLine[j0]);
if( access(zLine,X_OK)!=0 ){
Redirect(zRealScript, 302, 1, 370); /* LOG: redirect to not-found */
return;
}
stillSearching = 0;
break;
}else{
j--;
}
}
if( stillSearching ) NotFound(380); /* LOG: URI not found */
break;
}
if( S_ISREG(statbuf.st_mode) ){
if( access(zLine,R_OK) ){
NotFound(390); /* LOG: File not readable */
}
zRealScript = StrDup(&zLine[j0]);
break;
}
if( zScript[i]==0 || zScript[i+1]==0 ){
static const char *azIndex[] = {
"/home", "/index", "/index.html", "/index.cgi", "/not-found.html"
};
int k = j>0 && zLine[j-1]=='/' ? j-1 : j;
unsigned int jj;
for(jj=0; jj<sizeof(azIndex)/sizeof(azIndex[0]); jj++){
strcpy(&zLine[k],azIndex[jj]);
if( stat(zLine,&statbuf)!=0 ) continue;
if( !S_ISREG(statbuf.st_mode) ) continue;
if( access(zLine,R_OK) ) continue;
break;
}
if( jj>=sizeof(azIndex)/sizeof(azIndex[0]) ){
NotFound(400); /* LOG: URI is a directory w/o index.html */
}
zRealScript = StrDup(&zLine[j0]);
if( zScript[i]==0 && strcmp(zScript,"/")!=0 ){
/* If the requested URL does not end with "/" but we had to
** append "index.html", then a redirect is necessary. Otherwise
** none of the relative URLs in the delivered document will be
** correct. Except, we don't need to redirect if the URL
** consists of just a domain name and nothing else, for
** example "http://sqlite.org" without a trailing / does not
** need to redirect. */
Redirect(zRealScript,301,1,410); /* LOG: redirect to add trailing / */
return;
}
break;
}
zLine[j] = zScript[i];
i++; j++;
}
zFile = StrDup(zLine);
zPathInfo = StrDup(&zScript[i]);
lenFile = strlen(zFile);
zDir = StrDup(zFile);
for(i=strlen(zDir)-1; i>0 && zDir[i]!='/'; i--){};
if( i==0 ){
strcpy(zDir,"/");
}else{
zDir[i] = 0;
}
/* Check to see if there is an authorization file. If there is,
** process it.
*/
sprintf(zLine, "%s/-auth", zDir);
if( access(zLine,R_OK)==0 && !CheckBasicAuthorization(zLine) ){
tls_close_conn();
return;
}
/* Take appropriate action
*/
if( (statbuf.st_mode & 0100)==0100 && access(zFile,X_OK)==0
&& (!(pMimeType = GetMimeType(zFile, lenFile))
|| 0==(pMimeType->flags & MTF_NOCGI)) ){ /* CGI */
char *zBaseFilename; /* Filename without directory prefix */
int px[2]; /* CGI-1 to althttpd pipe */
int py[2]; /* zPostData to CGI-0 pipe */
/*
** Abort with an error if the CGI script is writable by anyone other
** than its owner.
*/
if( statbuf.st_mode & 0022 ){
CgiScriptWritable();
}
/* Compute the base filename of the CGI script */
for(i=strlen(zFile)-1; i>=0 && zFile[i]!='/'; i--){}
zBaseFilename = &zFile[i+1];
/* Create pipes used to communicate with the child CGI process */
if( pipe(px) ){
Malfunction(440, /* LOG: pipe() failed */
"Unable to create a pipe for the CGI program");
}
if( pipe(py) ){
Malfunction(441, /* LOG: pipe() failed */
"Unable to create a pipe for the CGI program");
}
/* Create the child process that will run the CGI. */
if( fork()==0 ){
/* This code is run by the child CGI process only
** Begin by setting up the CGI-to-althttpd pipe */
close(1);
if( dup(px[1])<0 ){
Malfunction(442, /* LOG: dup() failed */
"CGI cannot dup() to file descriptor 1");
}
/* Set up the althttpd-to-CGI link */
close(0);
if( dup(py[0])<0 ){
Malfunction(444, /* LOG: dup() failed */
"CGI cannot dup() to file descriptor 0");
}
/* Close all surplus file descriptors */
for(i=3; close(i)==0; i++){}
/* Move into the directory holding the CGI program */
if( chdir(zDir) ){
char zBuf[1000];
Malfunction(445, /* LOG: chdir() failed */
"CGI cannot chdir to [%s] from [%s]",
zDir, getcwd(zBuf,999));
}
/* Setup the CGI environment appropriately. */
ComputeRequestUri();
putenv("GATEWAY_INTERFACE=CGI/1.0");
for(i=0; i<(int)(sizeof(cgienv)/sizeof(cgienv[0])); i++){
if( *cgienv[i].pzEnvValue ){
SetEnv(cgienv[i].zEnvName,*cgienv[i].pzEnvValue);
}
}
/* Run the CGI program */
execl(zBaseFilename, zBaseFilename, (char*)0);
althttpd_exit(0); /* Not reached */
}else{
isCGI = 1;
}
/* This parent process. The child has been started.
** Set up the CGI-to-althttp pipe on which to receive the reply
*/
close(px[1]);
in = fdopen(px[0], "rb");
/* Set up the althttp-to-CGI pipe used to send POST data (if any) */
close(py[0]);
if( nPostData>0 ){
ssize_t wrote = 0, n;
while( nPostData>wrote ){
n = write(py[1], zPostData+wrote, nPostData-wrote);
if( n<=0 ) break;
wrote += n;
}
}
if( zPostData ){
free(zPostData);
zPostData = 0;
nPostData = 0;
}
close(py[1]);
/* Wait for the CGI program to reply and process that reply */
if( in==0 ){
CgiError();
}else{
CgiHandleReply(in, strncmp(zBaseFilename,"nph-",4)==0);
}
}else if( lenFile>5 && strcmp(&zFile[lenFile-5],".scgi")==0 ){
/* Any file that ends with ".scgi" is assumed to be text of the
** form:
** SCGI hostname port
** Open a TCP/IP connection to that host and send it an SCGI request
*/
SendScgiRequest(zFile, zScript);
}else if( countSlashes(zRealScript)!=countSlashes(zScript) ){
/* If the request URI for static content contains material past the
** actual content file name, report that as a 404 error. */
NotFound(460); /* LOG: Excess URI content past static file name */
}else{
/* If it isn't executable then it must be a simple file that needs
** to be copied to output.
*/
SetTimeout(30 + statbuf.st_size/2000,
805); /* LOG: Timeout send static file */
if( SendFile(zFile, lenFile, &statbuf) ){
return;
}
}
althttpd_fflush(stdout);
MakeLogEntry(0, 0); /* LOG: Normal reply */
omitLog = 1;
}
/*
** Launch a web-browser pointing to zPage
*/
static void launch_web_browser(const char *zPath, int iPort){
char zUrl[2000];
static const char *const azBrowserProg[] = {
#if defined(__DARWIN__) || defined(__APPLE__) || defined(__HAIKU__)
"open"
#else
"xdg-open", "gnome-open", "firefox", "google-chrome"
#endif
};
size_t i;
if( strlen(zPath)<=sizeof(zUrl)-1000 ){
while( zPath[0]=='/' ) zPath++;
sprintf(zUrl, "http://localhost:%d/%s", iPort, zPath);
for(i=0; i<sizeof(azBrowserProg)/sizeof(azBrowserProg[0]); i++){
execlp(azBrowserProg[i], azBrowserProg[i], zUrl, (char*)0);
}
}
althttpd_exit(1);
}
/*
** All possible forms of an IP address. Needed to work around GCC strict
** aliasing rules.
*/
typedef union {
struct sockaddr sa; /* Abstract superclass */
struct sockaddr_in sa4; /* IPv4 */
struct sockaddr_in6 sa6; /* IPv6 */
struct sockaddr_storage sas; /* Should be the maximum of the above 3 */
} address;
/*
** Implement an HTTP server daemon listening on port zPort.
**
** As new connections arrive, fork a child and let the child return
** out of this procedure call. The child will handle the request.
** The parent never returns from this procedure.
**
** Return 0 to each child as it runs. If unable to establish a
** listening socket, return non-zero.
**
** When it accept()s a connection, the socket ID is written to the
** final argument.
*/
int http_server(
int mnPort, int mxPort, /* Range of TCP ports to try */
int tlsPort, /* Additional TCP port for TLS connections */
int bLocalhost, /* Listen on loopback sockets only */
const char *zPage, /* Launch web browser on this document */
int *httpConnection /* Socket over which HTTP request arrives */
){
int listener = -1; /* The server socket */
int listenTLS = -1; /* Server socket for separate TLS */
int mxListener; /* Maximum of listener and listenTLS */
int connection; /* A socket for each individual connection */
fd_set readfds; /* Set of file descriptors for select() */
socklen_t lenaddr; /* Length of the inaddr structure */
int child; /* PID of the child process */
int nchildren = 0; /* Number of child processes */
struct timeval delay; /* How long to wait inside select() */
struct sockaddr_in6 inaddr; /* The socket address */
int opt = 1; /* setsockopt flag */
int iPort = mnPort;
while( iPort<=mxPort ){
memset(&inaddr, 0, sizeof(inaddr));
inaddr.sin6_family = AF_INET6;
if( bLocalhost ){
inaddr.sin6_addr = in6addr_loopback;
}else{
inaddr.sin6_addr = in6addr_any;
}
inaddr.sin6_port = htons(iPort);
listener = socket(AF_INET6, SOCK_STREAM, 0);
if( listener<0 ){
iPort++;
continue;
}
/* if we can't terminate nicely, at least allow the socket to be reused */
setsockopt(listener,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));
if( bind(listener, (struct sockaddr*)&inaddr, sizeof(inaddr))<0 ){
close(listener);
iPort++;
continue;
}
break;
}
if( iPort>mxPort ){
if( mnPort==mxPort ){
fprintf(stderr,"unable to open listening socket on port %d\n", mnPort);
}else{
fprintf(stderr,"unable to open listening socket on any"
" port in the range %d..%d\n", mnPort, mxPort);
}
althttpd_exit(1);
}
if( iPort>mxPort ) return 1;
zRealPort = StrDup(" ");
snprintf(zRealPort, 10, "%d", iPort);
listen(listener,100);
mxListener = listener;
#ifdef ENABLE_TLS
if( tlsPort && useHttps>=2 ){
memset(&inaddr, 0, sizeof(inaddr));
inaddr.sin6_family = AF_INET6;
if( bLocalhost ){
inaddr.sin6_addr = in6addr_loopback;
}else{
inaddr.sin6_addr = in6addr_any;
}
inaddr.sin6_port = htons(tlsPort);
listenTLS = socket(AF_INET6, SOCK_STREAM, 0);
if( listenTLS<0 ){
fprintf(stderr,"unable to open listening socket on port %d\n", tlsPort);
althttpd_exit(1);
}
/* if we can't terminate nicely, at least allow the socket to be reused */
setsockopt(listenTLS,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));
if( bind(listenTLS, (struct sockaddr*)&inaddr, sizeof(inaddr))<0 ){
fprintf(stderr,"unable to open listening socket on port %d\n", tlsPort);
althttpd_exit(1);
}
zRealTlsPort = StrDup(" ");
snprintf(zRealTlsPort, 10, "%d", tlsPort);
listen(listenTLS,100);
printf("Listening for TLS-encrypted HTTPS requests on TCP port %d\n",
tlsPort);
if( tlsPort>mxListener ) mxListener = tlsPort;
}
#endif
printf("Listening for %s requests on TCP port %d\n",
(useHttps&&tlsPort==0)?"TLS-encrypted HTTPS":"HTTP", iPort);
fflush(stdout);
if( zPage ){
child = fork();
if( child!=0 ){
if( child>0 ) nchildren++;
}else{
launch_web_browser(zPage, iPort);
/* NOT REACHED */
althttpd_exit(1);
}
}
while( 1 ){
int onTLSSocket; /* True if inbound connection on --tls-port */
delay.tv_sec = 0;
delay.tv_usec = 100000;
FD_ZERO(&readfds);
assert( listener>=0 );
FD_SET( listener, &readfds);
if( listenTLS>0 ){
FD_SET( listenTLS, &readfds);
}
select( mxListener+1, &readfds, 0, 0, &delay);
onTLSSocket = listenTLS>0 && FD_ISSET(listenTLS, &readfds);
if( onTLSSocket || FD_ISSET(listener, &readfds) ){
lenaddr = sizeof(inaddr);
if( onTLSSocket ){
connection = accept(listenTLS, (struct sockaddr*)&inaddr, &lenaddr);
}else{
connection = accept(listener, (struct sockaddr*)&inaddr, &lenaddr);
}
if( connection>=0 ){
int status; /* Required argument to wait() */
/* If we are already at the maximum number of allowed child processes,
** wait for an older process to die off before creating a new one */
while( nchildren>=mxChild && (child = wait(&status))>=0 ){
nchildren--;
/* printf("process %d ends; %d/%d\n",child,nchildren,mxChild);
** fflush(stdout); */
}
child = fork();
if( child!=0 ){
if( child>0 ) nchildren++;
close(connection);
/* printf("subprocess %d starts; %d/%d\n",child,nchildren,mxChild);
** fflush(stdout); */
}else{
int nErr = 0, fd;
close(0);
fd = dup(connection);
if( fd!=0 ) nErr++;
close(1);
fd = dup(connection);
if( fd!=1 ) nErr++;
close(connection);
*httpConnection = fd;
if( onTLSSocket ){
zRealPort = zRealTlsPort;
}else if( listenTLS>0 ){
useHttps = 0;
zHttps = 0;
zHttpScheme = "http";
}
close(listener);
if( listenTLS>0 ) close(listenTLS);
return nErr;
}
}
}
/* Bury dead children */
while( (child = waitpid(0, 0, WNOHANG))>0 ){
nchildren--;
/* printf("process %d ends; %d/%d\n",child,nchildren,mxChild);
** fflush(stdout); */
}
}
/* NOT REACHED */
althttpd_exit(1);
}
int main(int argc, const char **argv){
int i; /* Loop counter */
int mnPort = 0; /* Range of TCP ports for server mode */
int mxPort = 0;
int tlsPort = 0; /* The --tls-port value */
int useChrootJail = 1; /* True to use a change-root jail */
uid_t runUid = 0; /* User id to run as */
gid_t runGid = 0; /* Group id to run as */
int runUserSet = 0; /* 0: unset 1: set by -user 2: set by -root */
int httpConnection = 0; /* Socket ID of inbound http connection */
int bLocalhost = 0; /* Bind to loop-back TCP ports only */
const char *zPage = 0; /* Starting page */
/* Record the time when processing begins.
*/
gettimeofday(&beginTime, 0);
/* Parse command-line arguments
*/
while( argc>1 && argv[1][0]=='-' ){
int nTerm = 2;
const char *z = argv[1];
const char *zArg = argc>=3 ? argv[2] : "0";
if( z[0]=='-' && z[1]=='-' ) z++;
if( strcmp(z,"-root")==0 ){
zRoot = zArg;
}else
if( strcmp(z,"-logfile")==0 ){
zLogFile = zArg;
}else
#ifdef ENABLE_TLS
if( strcmp(z, "-cert")==0 ){
tlsState.zCertFile = zArg;
if( tlsState.zKeyFile==0 ) tlsState.zKeyFile = zArg;
useHttps = 2;
zHttpScheme = "https";
zHttps = "on";
if( standalone ){
standalone = 2;
}
}else
if( strcmp(z, "-pkey")==0 ){
tlsState.zKeyFile = zArg;
}else
if( strcmp(z, "-certdir")==0 && zArg!=0 ){
size_t szDir = strlen(zArg);
char *z = malloc( szDir+15 );
if( z ){
memcpy(z, zArg, szDir);
memcpy(z+szDir, "/fullchain.pem", 15);
tlsState.zCertFile = z;
}
z = malloc( szDir+13 );
if( z ){
memcpy(z, zArg, szDir);
memcpy(z+szDir, "/privkey.pem", 13);
tlsState.zKeyFile = z;
}
useHttps = 2;
zHttpScheme = "https";
zHttps = "on";
if( standalone ){
standalone = 2;
}
}else
#endif
if( strcmp(z,"-user")==0 ){
struct passwd *pwd = 0; /* Information about the user */
pwd = getpwnam(zArg);
if( pwd==0 ){
Malfunction(511, "no such user: %s", zArg);
}else{
runUid = pwd->pw_uid;
runGid = pwd->pw_gid;
runUserSet = 1;
}
}else
if( strcmp(z,"-ipshun")==0 ){
zIPShunDir = zArg;
}else
if( strcmp(z,"-max-age")==0 ){
mxAge = atoi(zArg);
}else
if( strcmp(z,"-max-cpu")==0 ){
maxCpu = atoi(zArg);
}else
if( strcmp(z,"-loopback")==0 ){
bLocalhost = 1;
nTerm = 1;
}else
if( strcmp(z,"-enable-sab")==0 ){
enableSAB = 1;
nTerm = 1;
}else
if( strcmp(z,"-page")==0 ){
zPage = zArg;
bLocalhost = 1;
if( mnPort==0 ){
mnPort = 8080;
mxPort = 8100;
}
standalone = 1 + (useHttps==2);
}else
if( strcmp(z,"-popup")==0 ){
nTerm = 1;
zRoot = ".";
if( mnPort==0 ){
mnPort = 8080;
mxPort = 8100;
}
standalone = 1 + (useHttps==2);
}else
if( strcmp(z,"-https")==0 ){
int const x = atoi(zArg);
if( x<=0 ){
useHttps = 0;
zHttpScheme = "http";
zHttps = 0;
tlsPort = 0;
}else{
zHttpScheme = "https";
zHttps = "on";
zRemoteAddr = getenv("REMOTE_HOST");
if( zRealPort==0 ) zRealPort = "443";
useHttps = 1;
}
}else
if( strcmp(z, "-port")==0 ){
int ii;
mnPort = mxPort = 0;
for(ii=0; zArg[ii]>='0' && zArg[ii]<='9'; ii++){
mnPort = mnPort*10 + zArg[ii] - '0';
}
if( zArg[ii]==0 ){
mxPort = mnPort;
}else if( zArg[ii]=='.' && zArg[ii+1]=='.' ){
for(ii+=2; zArg[ii]>='0' && zArg[ii]<='9'; ii++){
mxPort = mxPort*10 + zArg[ii] - '0';
}
}
standalone = 1 + (useHttps==2);
}else
#ifdef ENABLE_TLS
if( strcmp(z, "-tls-port")==0 ){
int ii;
tlsPort = 0;
for(ii=0; zArg[ii]>='0' && zArg[ii]<='9'; ii++){
tlsPort = tlsPort*10 + zArg[ii] - '0';
}
standalone = 2;
}else
#endif
if( strcmp(z, "-max-child")==0 ){
mxChild = atoi(zArg);
}else
if( strcmp(z, "-jail")==0 ){
if( atoi(zArg)==0 ){
useChrootJail = 0;
}
}else
if( strcmp(z, "-debug")==0 ){
if( atoi(zArg) ){
useTimeout = 0;
}
}else
if( strcmp(z, "-input")==0 ){
if( freopen(zArg, "rb", stdin)==0 || stdin==0 ){
Malfunction(514, /* LOG: cannot open --input file */
"cannot open --input file \"%s\"\n", zArg);
}
}else
if( strcmp(z, "-version")==0 ){
puts(SERVER_SOFTWARE_TLS);
printf("%s %.20s\n", MANIFEST_DATE, MANIFEST_UUID);
printf("Compiled on " __DATE__ " using " COMPILER "\n");
return 0;
}else
if( strcmp(z, "-datetest")==0 ){
TestParseRfc822Date();
printf("Ok\n");
althttpd_exit(0);
}else
if( strcmp(z,"-remote-addr")==0 ){
/* Used for testing purposes only - to simulate a remote IP address when
** input is really coming from a disk file. */
zRemoteAddr = StrDup(zArg);
}else
if( strcmp(z,"-help")==0 ){
printf("%s", zHelp);
return 0;
}else
if( strcmp(z,"-options")==0 ){
const char *zTxt, *zEOL, *zTwoSp;
zTxt = zHelp;
while( zTxt[0] ){
int n;
zEOL = strchr(zTxt,'\n');
n = (int)(zEOL - zTxt);
if( n>10
&& memcmp(zTxt," --",3)==0
&& (zTwoSp = strstr(zTxt," "))!=0
){
int m = (int)(zTwoSp - zTxt);
printf("%.*s\n", m, zTxt);
}
zTxt = zEOL+1;
}
return 0;
}else
{
Malfunction(515, /* LOG: unknown command-line argument on launch */
"unknown argument \"%s\". "
"Maybe use '--help' or '--version' or '--options'\n", z);
}
argv += nTerm;
argc -= nTerm;
}
if( zRoot==0 ){
if( !standalone ){
mnPort = 8080;
mxPort = 8100;
}
standalone = 1;
bLocalhost = 1;
zRoot = ".";
}
/*
** 10 seconds to get started
*/
if( useTimeout ){
signal(SIGALRM, Timeout);
signal(SIGSEGV, Timeout);
signal(SIGPIPE, Timeout);
signal(SIGXCPU, Timeout);
if( !standalone ) SetTimeout(10, 806); /* LOG: Timeout startup */
}
#if ENABLE_TLS
if( mnPort<=0 && tlsPort>0 ){
/* If the users says --tls-port only, and omits --port, that means they
** want only TLS. So adjust the arguments accordingly. */
mnPort = mxPort = tlsPort;
tlsPort = 0;
if( tlsState.zCertFile==0 ){
Malfunction(516, /* LOG: No cert specified */
"No -cert specified; cannot use TLS");
}
}
/* We "need" to read the cert before chroot'ing to allow that the
** cert is stored in space outside of the --root and not readable by
** the --user.
*/
if( useHttps>=2 && tlsPort ){
/* If separate --port and --tls-port options are provided but the
** --cert file does not exist, then fall back to ordinary non-TLS
** operation on --port. No complaints. This enables the same althttpd
** command to bring up a non-TLS-only server before a cert is obtained,
** and a dual non-TLS/TLS server after the cert is present.
*/
const char *zFN = tlsState.zCertFile;
if( zFN==0 || (strcmp(zFN,"unsafe-builtin") && access(zFN,R_OK)) ){
useHttps = 0;
}
}
if( useHttps>=2 ){
ssl_init_server(tlsState.zCertFile, tlsState.zKeyFile);
}else if( tlsPort ){
tlsPort = 0;
}
#endif
/* Change directories to the root of the HTTP filesystem. Then
** create a chroot jail there.
*/
if( chdir(zRoot)!=0 ){
Malfunction(517, /* LOG: chdir() failed */
"cannot change to directory [%s]", zRoot);
}
/* Get information about the user if available */
if( runUserSet==0 && getuid()==0 ){
struct stat statbuf;
if( stat(".", &statbuf)==0 ){
runUid = statbuf.st_uid;
runGid = statbuf.st_gid;
runUserSet = 2;
}
}
if( getuid()==0 && (runUid==0 || runGid==0) ){
static const char *zErrMsg[] = {
/*0*/ ". Fix by adding \"-user NAME\" or chown the -root directory?",
/*1*/ " obtained from -user. Maybe pick a different user?",
/*2*/ " based on the owner of the -root directory. Fix by running"
" chown on that directory so that neither value is 0"
};
Malfunction(518, "Cannot run as root, but I have uid=%d, gid=%d%s",
(int)runUid, (int)runGid, zErrMsg[runUserSet]);
return 1;
}
/* Enter the chroot jail if requested */
if( useChrootJail && getuid()==0 ){
if( chroot(".")<0 ){
Malfunction(519, /* LOG: chroot() failed */
"unable to create chroot jail");
}else{
zRoot = "";
}
}
/* Activate the server, if requested */
if( mnPort>0 && mnPort<=mxPort
&& http_server(mnPort, mxPort, tlsPort, bLocalhost, zPage, &httpConnection)
){
Malfunction(520, /* LOG: server startup failed */
"failed to start server");
}
#ifdef RLIMIT_CPU
if( maxCpu>0 ){
struct rlimit rlim;
rlim.rlim_cur = maxCpu;
rlim.rlim_max = maxCpu;
setrlimit(RLIMIT_CPU, &rlim);
}
#endif
/* Drop root privileges.
*/
if( runUserSet ){
if( setgid(runGid) ){
Malfunction(521, /* LOG: setgid() failed */
"cannot set group-id to %d", (int)runGid);
}
if( setuid(runUid) ){
Malfunction(522, /* LOG: setuid() failed */
"cannot set user-id to %d", (int)runUid);
}
}
if( getuid()==0 ){
Malfunction(524, /* LOG: cannot run as root */
"cannot run as root");
}
/* Get the IP address from whence the request originates
*/
if( zRemoteAddr==0 ){
address remoteAddr;
socklen_t size = sizeof(remoteAddr);
char zHost[NI_MAXHOST];
if( getpeername(0, &remoteAddr.sa, &size)>=0 ){
getnameinfo(&remoteAddr.sa, size, zHost, sizeof(zHost), 0, 0,
NI_NUMERICHOST);
zRemoteAddr = StrDup(zHost);
}
}
if( zRemoteAddr!=0
&& strncmp(zRemoteAddr, "::ffff:", 7)==0
&& strchr(zRemoteAddr+7, ':')==0
&& strchr(zRemoteAddr+7, '.')!=0
){
zRemoteAddr += 7;
}
zServerSoftware = useHttps==2 ? SERVER_SOFTWARE_TLS : SERVER_SOFTWARE;
/* Process the input stream */
for(i=0; i<100; i++){
ProcessOneRequest(0, httpConnection);
}
ProcessOneRequest(1, httpConnection);
tls_close_conn();
althttpd_exit(0);
}
#if 0
/* Copy/paste the following text into SQLite to generate the xref
** table that describes all error codes.
*/
BEGIN;
CREATE TABLE IF NOT EXISTS xref(lineno INTEGER PRIMARY KEY, desc TEXT);
DELETE FROM xref;
INSERT INTO xref VALUES(0,'Normal reply');
INSERT INTO xref VALUES(2,'Normal HEAD reply');
INSERT INTO xref VALUES(100,'Malloc() failed');
INSERT INTO xref VALUES(110,'Not authorized');
INSERT INTO xref VALUES(120,'CGI Error');
INSERT INTO xref VALUES(131,'SIGSEGV');
INSERT INTO xref VALUES(132,'SIGPIPE');
INSERT INTO xref VALUES(133,'SIGXCPU');
INSERT INTO xref VALUES(139,'Unknown signal');
INSERT INTO xref VALUES(140,'CGI script is writable');
INSERT INTO xref VALUES(150,'Cannot open -auth file');
INSERT INTO xref VALUES(160,' http request on https-only page');
INSERT INTO xref VALUES(170,'-auth redirect');
INSERT INTO xref VALUES(180,' malformed entry in -auth file');
INSERT INTO xref VALUES(190,'chdir() failed');
INSERT INTO xref VALUES(200,'bad protocol in HTTP header');
INSERT INTO xref VALUES(201,'URI too long');
INSERT INTO xref VALUES(210,'Empty request URI');
INSERT INTO xref VALUES(220,'Unknown request method');
INSERT INTO xref VALUES(230,'Referrer is devids.net');
INSERT INTO xref VALUES(240,'Illegal content in HOST: parameter');
INSERT INTO xref VALUES(250,'Disallowed user agent');
INSERT INTO xref VALUES(251,'Disallowed user agent (20190424)');
INSERT INTO xref VALUES(260,'Disallowed referrer');
INSERT INTO xref VALUES(270,'Request too large');
INSERT INTO xref VALUES(300,'Path element begins with "." or "-"');
INSERT INTO xref VALUES(310,'URI does not start with "/"');
INSERT INTO xref VALUES(320,'URI too long');
INSERT INTO xref VALUES(330,'Missing HOST: parameter');
INSERT INTO xref VALUES(340,'HOST parameter too long');
INSERT INTO xref VALUES(350,'*.website permissions');
INSERT INTO xref VALUES(360,'chdir() failed');
INSERT INTO xref VALUES(370,'redirect to not-found');
INSERT INTO xref VALUES(380,'URI not found');
INSERT INTO xref VALUES(390,'File not readable');
INSERT INTO xref VALUES(400,'URI is a directory w/o index.html');
INSERT INTO xref VALUES(410,'redirect to add trailing /');
INSERT INTO xref VALUES(440,'pipe() failed');
INSERT INTO xref VALUES(441,'pipe() failed');
INSERT INTO xref VALUES(442,'dup() failed');
INSERT INTO xref VALUES(444,'dup() failed');
INSERT INTO xref VALUES(445,'chdir() failed');
INSERT INTO xref VALUES(460,'Excess URI content past static file name');
INSERT INTO xref VALUES(470,'ETag Cache Hit');
INSERT INTO xref VALUES(480,'fopen() failed for static content');
INSERT INTO xref VALUES(501,'Error initializing the SSL Server');
INSERT INTO xref VALUES(502,'Error loading CERT file');
INSERT INTO xref VALUES(503,'Error loading private key file');
INSERT INTO xref VALUES(504,'Error loading self-signed cert');
INSERT INTO xref VALUES(505,'No cert');
INSERT INTO xref VALUES(506,'private key does not match cert');
INSERT INTO xref VALUES(507,'TlsServerConn');
INSERT INTO xref VALUES(508,'SSL not available');
INSERT INTO xref VALUES(509,'SSL not available');
INSERT INTO xref VALUES(510,'SSL not available');
INSERT INTO xref VALUES(512,'TLS context');
INSERT INTO xref VALUES(513,'unknown IP protocol');
INSERT INTO xref VALUES(514,'cannot open --input file');
INSERT INTO xref VALUES(515,'unknown command-line argument on launch');
INSERT INTO xref VALUES(516,'--root argument missing');
INSERT INTO xref VALUES(517,'chdir() failed');
INSERT INTO xref VALUES(519,'chroot() failed');
INSERT INTO xref VALUES(520,'server startup failed');
INSERT INTO xref VALUES(521,'setgid() failed');
INSERT INTO xref VALUES(522,'setuid() failed');
INSERT INTO xref VALUES(523,'unknown user');
INSERT INTO xref VALUES(524,'cannot run as root');
INSERT INTO xref VALUES(526,'SSL read too big');
INSERT INTO xref VALUES(527,'SSL read error');
INSERT INTO xref VALUES(528,'SSL write too big');
INSERT INTO xref VALUES(529,'Output buffer too small');
INSERT INTO xref VALUES(600,'OOM');
INSERT INTO xref VALUES(610,'OOM');
INSERT INTO xref VALUES(700,'cannot open file');
INSERT INTO xref VALUES(701,'cannot read file');
INSERT INTO xref VALUES(702,'bad SCGI spec');
INSERT INTO xref VALUES(703,'bad SCGI spec (2)');
INSERT INTO xref VALUES(704,'Unrecognized line in SCGI spec');
INSERT INTO xref VALUES(705,'Cannot resolve SCGI server name');
INSERT INTO xref VALUES(706,'bad SCGI fallback');
INSERT INTO xref VALUES(707,'Cannot open socket to SCGI');
INSERT INTO xref VALUES(708,'OOM');
INSERT INTO xref VALUES(720,'chdir() failed');
INSERT INTO xref VALUES(721,'SCGI relight failed');
INSERT INTO xref VALUES(800,'CGI Handler timeout');
INSERT INTO xref VALUES(801,'Timeout request header (1+)');
INSERT INTO xref VALUES(802,'Timeout request header (0)');
INSERT INTO xref VALUES(803,'Timeout POST data');
INSERT INTO xref VALUES(804,'Timeout decode HTTP request');
INSERT INTO xref VALUES(805,'Timeout send static file');
INSERT INTO xref VALUES(806,'Timeout startup');
INSERT INTO xref VALUES(901,'Prohibited remote IP address');
INSERT INTO xref VALUES(902,'Bashdoor attack');
INSERT INTO xref VALUES(903,'CGI reports abusive request');
#endif /* SQL */