/*
** 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.
**
*************************************************************************
**
** This source code file implements a small, simple, stand-alone HTTP
** server.
**
** Features:
**
** * Launched from inetd/xinetd/systemd, or as a stand-alone server
** * One process per TCP/IP connection
** * Deliver static content or run CGI or SCGI
** * Virtual sites based on the "Host:" property of the HTTP header
** * Runs in a chroot jail
** * Unified log file in a CSV format
** * Small code base (this 1 file) to facilitate security auditing
** * Simple setup - no configuration files to misconfigure
**
** This file implements a small and simple but secure and effective web
** server. There are no frills. Anything that could be reasonably
** omitted has been.
**
** Setup rules:
**
** (1) Launch as root from inetd/systemd like this:
**
** althttpd -logfile logfile -root /home/www -user nobody
**
** It will automatically chroot to /home/www and become user "nobody".
** The logfile name should be relative to the chroot jail.
**
** (2) Directories of the form "*.website" (ex: www_sqlite_org.website)
** contain content. The directory is chosen based on the HTTP_HOST
** request header. If there is no HTTP_HOST header or if the
** corresponding host directory does not exist, then the
** "default.website" is used.
**
** In stand-alone mode (when the --port, --page, or --popup options are
** used) if neither the HTTP_HOST.website nor "default.website"
** directories exist, then files are served directly from the
** directory from which althttpd was launched. This makes it easy
** to run a quick web-server for testing purposes using commands like:
**
** althttpd --page fiddle.html
** althttpd --popup
** althttpd --port 8080..8090
**
** In one-connection mode (when launched from xinetd or similar)
** an error is raised if "default.website" does not exist.
**
** If the HTTP_HOST header contains any charaters other than
** [a-zA-Z0-9_.,*~/] then a 403 error is generated.
**
** (3) Any file or directory whose name begins with "." or "-" is ignored,
** except if the URL begins with "/.well-known/" then initial "." and
** "-" characters are allowed, but not initial "..". The exception is
** for RFC-5785 to allow letsencrypt or certbot to generate a TLS cert
** using webroot.
**
** (4) Characters other than [0-9a-zA-Z,-./:_~] and any %HH characters
** escapes in the filename are all translated into "_". This is
** a defense against cross-site scripting attacks and other mischief.
**
** (5) Executable files are run as CGI. Files whose name ends with ".scgi"
** trigger an SCGI request (see item 9 below). All other files
** are delivered as is.
**
** (6) If a file named "-auth" exists in the same directory as the file to
** be run as CGI/SCGI or to be delivered, then it contains information
** for HTTP Basic authorization. See file format details below.
**
** (7) To run as a stand-alone server, simply add the "-port N" command-line
** option to define which TCP port to listen on. If the argument is
** "--port N1..N2" then TCP ports between N1 and N2 are scanned looking
** for one that is open and the first open port is used.
**
** (8) For static content, the mimetype is determined by the file suffix
** using a table built into the source code below. If you have
** unusual content files, you might need to extend this table.
**
** (9) Content files that end with ".scgi" and that contain text of the
** form "SCGI hostname port" will format an SCGI request and send it
** to hostname:port, then relay back the reply. Error behavior is
** determined by subsequent lines of the .scgi file. See SCGI below
** for details.
**
** (10) If compiled with -DENABLE_TLS and linked against OpenSSL and
** launched with a --cert option to identify a certificate file, then
** TLS is used to encrypt the connection.
**
** (11) When requesting static file NAME and if the HTTP request includes
** "Accept-Encoding: gzip" and if file "NAME.gz" exists on disk, then
** return NAME.gz with an "Content-encoding: gzip" header
**
** Command-line Options:
**
** --root DIR Defines the directory that contains the various
** $HOST.website subdirectories, each containing web content
** for a single virtual host. If launched as root and if
** "--user USER" also appears on the command-line and if
** "--jail 0" is omitted, then the process runs in a chroot
** jail rooted at this directory and under the userid USER.
** This option is required for xinetd launch but defaults
** to "." for a stand-alone web server. DIR should always
** be an absolute path, else child processes might misbehave.
**
** --port N Run in standalone mode listening on TCP port N, or from
** --port N1..N2 the first available TCP port in the range from N1 to N2.
**
** --user USER Define the user under which the process should run if
** originally launched as root. This process will refuse to
** run as root (for security). If this option is omitted and
** the process is launched as root, it will abort without
** processing any HTTP requests.
**
** --logfile FILE Append a single-line, CSV-format, log file entry to FILE
** for each HTTP request. FILE should be a full pathname.
** The FILE name is interpreted inside the chroot jail. The
** FILE name is expanded using strftime() if it contains
** at least one '%' and is not too long.
**
** --ipshun DIR If the remote IP address is also the name of a file
** in DIR that has size N bytes and where either N is zero
** or the m-time of the file is less than N time-units ago
** then that IP address is being shunned and no requests
** are processed. The time-unit is a compile-time option
** (BANISH_TIME) that defaults to 300 seconds. If this
** happens, the client gets a 503 Service Unavailable
** reply. Furthermore, althttpd will create ip-shunning
** files following a 404 Not Found error if the request
** URI is an obvious hack attempt. The ip-shunning file
** will also be created if a CGI returns status code 418.
**
** --https BOOLEAN Indicates that input is coming over SSL and is being
** decoded upstream, perhaps by stunnel. This option
** does *not* activate built-in TLS support. Use --cert
** for that.
**
** --page NAME Come up in stand-alone mode, and then try to launch a
** web-browser pointing to the NAME document after the
** listening socket has been created. This option
** implies --loopback and "--port 8080..8100".
**
** --popup Launch a stand-alone web server to use for testing.
** This option implies "--port 8080..8100". This option
** is similar to "--page NAME" except that it does not
** try to launch a web-browser and does not force the
** connection into --loopback mode. Use this when
** running a test web-server on a remote host via ssh.
**
** --loopback Only accept loop-back TCP connections (connections
** originating from the same host). This is the
** default if --root is omitted.
**
** --family ipv4 Only accept input from IPV4 or IPV6, respectively.
** --family ipv6 These options are only meaningful if althttpd is run
** as a stand-alone server.
**
** --jail BOOLEAN Indicates whether or not to form a chroot jail if
** initially run as root. The default is true, so the only
** useful variant of this option is "--jail 0" which prevents
** the formation of the chroot jail.
**
** --max-age SEC The value for "Cache-Control: max-age=%d". Defaults to
** 120 seconds.
**
** --max-cpu SEC Maximum number of seconds of CPU time allowed per
** HTTP connection. Default 30 (build option:
** -DMAX_CPU=integer). 0 means no limit.
**
** --debug BOOLEAN Disables input timeouts. This is useful for debugging
** when inputs are being typed in manually.
**
** --enable-sab Add new lines to the HTTP reply header that are
** prerequisites for SharedArrayBuffer. These are the lines:
** Cross-Origin-Embedder-Policy: require-corp
** Cross-Origin-Opener-Policy: same-origin
**
**
** Additional command-line options available when compiling with ENABLE_TLS:
**
** --cert FILE The TLS certificate, the "fullchain.pem" file
**
** --pkey FILE The TLS private key, the "privkey.pem" file. May be
** omitted if the --cert file is the concatenation of
** the fullchain.pem and the privkey.pem.
**
**
** Command-line options can take either one or two initial "-" characters.
** So "--debug" and "-debug" mean the same thing, for example.
**
**
** Security Features:
**
** (1) This program automatically puts itself inside a chroot jail if
** it can and if not specifically prohibited by the "--jail 0"
** command-line option. The root of the jail is the directory that
** contains the various $HOST.website content subdirectories.
**
** (2) No input is read while this process has root privileges. Root
** privileges are dropped prior to reading any input (but after entering
** the chroot jail, of course). If root privileges cannot be dropped
** (for example because the --user command-line option was omitted or
** because the user specified by the --user option does not exist),
** then the process aborts with an error prior to reading any input.
**
** (3) The length of an HTTP request is limited to MAX_CONTENT_LENGTH bytes
** (default: 250 million). Any HTTP request longer than this fails
** with an error. (Build option: -DMAX_CONTENT_LENGTH=integer)
**
** (4) There are hard-coded time-outs on each HTTP request. If this process
** waits longer than the timeout for the complete request, or for CGI
** to finish running, then this process aborts. (The timeout feature
** can be disabled using the --debug command-line option.)
**
** (5) If the HTTP_HOST request header contains characters other than
** [0-9a-zA-Z,-./:_~] then the entire request is rejected.
**
** (6) Any characters in the URI pathname other than [0-9a-zA-Z,-./:_~]
** are converted into "_". This applies to the pathname only, not
** to the query parameters or fragment.
**
** (7) If the first character of any URI pathname component is "." or "-"
** then a 404 Not Found reply is generated. This prevents attacks
** such as including ".." or "." directory elements in the pathname
** and allows placing files and directories in the content subdirectory
** that are invisible to all HTTP requests, by making the first
** character of the file or subdirectory name "-" or ".".
**
** (8) The request URI must begin with "/" or else a 404 error is generated.
**
** (9) This program never sets the value of an environment variable to a
** string that begins with "() {".
**
** (10) If the --ipshun option is used, specific IP addresses can be
** temporarily block for abusive behavior.
**
** (11) If a CGI reports status code 418 ("I'm a teapot", rfc2324) and if
** the --ipshun option is used, then the IP address is temporarily
** blocked.
**
** Security Auditing:
**
** This webserver mostly only serves static content. Any security risk will
** come from CGI and SCGI. To check an installation for security, then, it
** makes sense to focus on the CGI and SCGI scripts.
**
** To locate all CGI files:
**
** find *.website -executable -type f -print
** OR: find *.website -perm +0111 -type f -print
**
** The first form of the "find" command is preferred, but is only supported
** by GNU find. On a Mac, you'll have to use the second form.
**
** To find all SCGI files:
**
** find *.website -name '*.scgi' -type f -print
**
** If any file is a security concern, it can be disabled on a live
** installation by turning off read permissions:
**
** chmod 0000 file-of-concern
**
** SCGI Specification Files:
**
** Content files (files without the execute bit set) that end with ".scgi"
** specify a connection to an SCGI server. The format of the .scgi file
** follows this template:
**
** SCGI hostname port
** fallback: fallback-filename
** relight: relight-command
**
** The first line specifies the location and TCP/IP port of the SCGI
** server that will handle the request. Subsequent lines determine
** what to do if the SCGI server cannot be contacted. If the
** "relight:" line is present, then the relight-command is run using
** system() and the connection is retried after a 1-second delay. Use
** "&" at the end of the relight-command to run it in the background.
** Make sure the relight-command does not generate output, or that
** output will become part of the SCGI reply. Add a ">/dev/null"
** suffix (before the "&") to the relight-command if necessary to
** suppress output. If there is no relight-command, or if the relight
** is attempted but the SCGI server still cannot be contacted, then
** the content of the fallback-filename file is returned as a
** substitute for the SCGI request. The mimetype is determined by the
** suffix on the fallback-filename. The fallback-filename would
** typically be an error message indicating that the service is
** temporarily unavailable.
**
** Basic Authorization:
**
** If the file "-auth" exists in the same directory as the content file
** (for both static content and CGI) then it contains the information used
** for basic authorization. The file format is as follows:
**
** * 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.
**
** There can be multiple "user" lines. If no "user" line matches, the
** request fails with a 401 error.
**
** Because of security rule (7), there is no way for the content of the "-auth"
** file to leak out via HTTP request.
*/
#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
#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 *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 int ipv6Only = 0; /* Use IPv6 only */
static int ipv4Only = 0; /* Use IPv4 only */
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 */
/* 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( !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" },
{ "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
&& strstr(zAcceptEncoding,"gzip")!=0
){
szFilename = strlen(zFile);
if( szFilename < sizeof(zGzFilename)-10 ){
memcpy(zGzFilename, zFile, szFilename);
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, "Out of memory: %d bytes", nMalloc); /* LOG: OOM */
}
}
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, "Out of memory: %d bytes", nMalloc); /* LOG: OOM */
}
}
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 */
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 a header within 10 seconds for the first request.
** Allow up to 5 more minutes for the follow-on requests
*/
if( useTimeout ){
if( nRequest>0 ){
SetTimeout(60*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);
}
clock_gettime(ALTHTTPD_CLOCK_ID, &tsBeginTime);
gettimeofday(&beginTime, 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 = 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]);
Redirect(zRealScript, 302, 1, 370); /* LOG: redirect to not-found */
return;
}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"
};
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);
}
#define MAX_PARALLEL 50 /* Number of simultaneous children */
/*
** 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 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 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_in inaddr; /* The socket address */
int opt = 1; /* setsockopt flag */
int iPort = mnPort;
while( iPort<=mxPort ){
memset(&inaddr, 0, sizeof(inaddr));
inaddr.sin_family = AF_INET;
if( bLocalhost ){
inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
}else{
inaddr.sin_addr.s_addr = htonl(INADDR_ANY);
}
inaddr.sin_port = htons(iPort);
listener = socket(AF_INET, 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;
listen(listener,10);
printf("Listening for %s requests on TCP port %d\n",
useHttps?"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 ){
if( nchildren>MAX_PARALLEL ){
/* Slow down if connections are arriving too fast */
sleep( nchildren-MAX_PARALLEL );
}
delay.tv_sec = 0;
delay.tv_usec = 100000;
FD_ZERO(&readfds);
assert( listener>=0 );
FD_SET( listener, &readfds);
select( listener+1, &readfds, 0, 0, &delay);
if( FD_ISSET(listener, &readfds) ){
lenaddr = sizeof(inaddr);
connection = accept(listener, (struct sockaddr*)&inaddr, &lenaddr);
if( connection>=0 ){
child = fork();
if( child!=0 ){
if( child>0 ) nchildren++;
close(connection);
/* printf("subprocess %d started...\n", child); 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;
return nErr;
}
}
}
/* Bury dead children */
while( (child = waitpid(0, 0, WNOHANG))>0 ){
/* printf("process %d ends\n", child); fflush(stdout); */
nchildren--;
}
}
/* NOT REACHED */
althttpd_exit(1);
}
int main(int argc, const char **argv){
int i; /* Loop counter */
const char *zPermUser = 0; /* Run daemon with this user's permissions */
int mnPort = 0; /* Range of TCP ports for server mode */
int mxPort = 0;
int useChrootJail = 1; /* True to use a change-root jail */
struct passwd *pwd = 0; /* Information about the user */
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 ){
useHttps = 2;
zHttpScheme = "https";
zHttps = "on";
tlsState.zCertFile = zArg;
if( tlsState.zKeyFile==0 ) tlsState.zKeyFile = zArg;
if( standalone ){
standalone = 2;
}
}else
if( strcmp(z, "-pkey")==0 ){
tlsState.zKeyFile = zArg;
}else
#endif
if( strcmp(z,"-user")==0 ){
zPermUser = zArg;
}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;
}else{
zHttpScheme = "https";
zHttps = "on";
zRemoteAddr = getenv("REMOTE_HOST");
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
if( strcmp(z, "-family")==0 ){
if( strcmp(zArg, "ipv4")==0 ){
ipv4Only = 1;
}else if( strcmp(zArg, "ipv6")==0 ){
ipv6Only = 1;
}else{
Malfunction(513, /* LOG: unknown IP protocol */
"unknown IP protocol: [%s]\n", 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
{
Malfunction(515, /* LOG: unknown command-line argument on launch */
"unknown argument: [%s]\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
/* 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 ){
ssl_init_server(tlsState.zCertFile, tlsState.zKeyFile);
}
#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( zPermUser ) pwd = getpwnam(zPermUser);
else if( getuid()==0 ){
Malfunction(518, "Cannot run as root. Use the -user USER flag.");
return 1;
}
/* Enter the chroot jail if requested */
if( zPermUser && 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, 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( zPermUser ){
if( pwd ){
if( setgid(pwd->pw_gid) ){
Malfunction(521, /* LOG: setgid() failed */
"cannot set group-id to %d", pwd->pw_gid);
}
if( setuid(pwd->pw_uid) ){
Malfunction(522, /* LOG: setuid() failed */
"cannot set user-id to %d", pwd->pw_uid);
}
}else{
Malfunction(523, /* LOG: unknown user */
"no such user [%s]", zPermUser);
}
}
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 */