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/* ====================================================================
* Copyright (c) 1995-1997 The Apache Group. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 5. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
#define CORE_PRIVATE
#include "httpd.h"
#include "http_config.h"
#include "http_conf_globals.h"
#include "http_main.h"
#include "http_log.h"
#include "http_protocol.h"
#include "http_core.h" /* For document_root. Sigh... */
#include "http_request.h" /* for sub_req_lookup_uri() */
#include "util_script.h"
/*
* Various utility functions which are common to a whole lot of
* script-type extensions mechanisms, and might as well be gathered
* in one place (if only to avoid creating inter-module dependancies
* where there don't have to be).
*/
#define MALFORMED_MESSAGE "malformed header from script. Bad header="
#define MALFORMED_HEADER_LENGTH_TO_SHOW 30
/* If a request includes query info in the URL (stuff after "?"), and
* the query info does not contain "=" (indicative of a FORM submission),
* then this routine is called to create the argument list to be passed
* to the CGI script. When suexec is enabled, the suexec path, user, and
* group are the first three arguments to be passed; if not, all three
* must be NULL. The query info is split into separate arguments, where
* "+" is the separator between keyword arguments.
*/
static char **create_argv(pool *p, char *path, char *user, char *group,
char *av0, const char *args)
{
int x, numwords;
char **av;
char *w;
int idx = 0;
/* count the number of keywords */
for (x = 0, numwords = 1; args[x]; x++)
if (args[x] == '+') ++numwords;
if (numwords > APACHE_ARG_MAX - 5) {
numwords = APACHE_ARG_MAX - 5; /* Truncate args to prevent overrun */
}
av = (char **)palloc(p, (numwords + 5) * sizeof(char *));
if (path)
av[idx++] = path;
if (user)
av[idx++] = user;
if (group)
av[idx++] = group;
av[idx++] = av0;
for (x = 1; x <= numwords; x++) {
w = getword_nulls(p, &args, '+');
unescape_url(w);
av[idx++] = escape_shell_cmd(p, w);
}
av[idx] = NULL;
return av;
}
static char *http2env(pool *a, char *w)
{
char *res = pstrcat (a, "HTTP_", w, NULL);
char *cp = res;
while (*++cp)
if (*cp == '-') *cp = '_';
else *cp = toupper(*cp);
return res;
}
API_EXPORT(char **) create_environment(pool *p, table *t)
{
array_header *env_arr = table_elts (t);
table_entry *elts = (table_entry *)env_arr->elts;
char **env = (char **)palloc (p, (env_arr->nelts + 2) *sizeof (char *));
int i, j;
char *tz;
j = 0;
tz = getenv("TZ");
if (tz!= NULL) env[j++] = pstrcat(p, "TZ=", tz, NULL);
for (i = 0; i < env_arr->nelts; ++i) {
if (!elts[i].key) continue;
env[j++] = pstrcat (p, elts[i].key, "=", elts[i].val, NULL);
}
env[j] = NULL;
return env;
}
API_EXPORT(void) add_common_vars(request_rec *r)
{
table *e = r->subprocess_env;
server_rec *s = r->server;
conn_rec *c = r->connection;
const char *rem_logname;
char port[40],*env_path;
array_header *hdrs_arr = table_elts (r->headers_in);
table_entry *hdrs = (table_entry *)hdrs_arr->elts;
int i;
/* First, add environment vars from headers... this is as per
* CGI specs, though other sorts of scripting interfaces see
* the same vars...
*/
for (i = 0; i < hdrs_arr->nelts; ++i) {
if (!hdrs[i].key) continue;
/* A few headers are special cased --- Authorization to prevent
* rogue scripts from capturing passwords; content-type and -length
* for no particular reason.
*/
if (!strcasecmp (hdrs[i].key, "Content-type"))
table_set (e, "CONTENT_TYPE", hdrs[i].val);
else if (!strcasecmp (hdrs[i].key, "Content-length"))
table_set (e, "CONTENT_LENGTH", hdrs[i].val);
else if (!strcasecmp (hdrs[i].key, "Authorization"))
continue;
else
table_set (e, http2env (r->pool, hdrs[i].key), hdrs[i].val);
}
ap_snprintf(port, sizeof(port), "%u", s->port);
if(!(env_path = getenv("PATH")))
env_path=DEFAULT_PATH;
table_set (e, "PATH", env_path);
table_set (e, "SERVER_SOFTWARE", SERVER_VERSION);
table_set (e, "SERVER_NAME", s->server_hostname);
table_set (e, "SERVER_PORT", port);
table_set (e, "REMOTE_HOST",
get_remote_host(c, r->per_dir_config, REMOTE_NAME));
table_set (e, "REMOTE_ADDR", c->remote_ip);
table_set (e, "DOCUMENT_ROOT", document_root(r)); /* Apache */
table_set (e, "SERVER_ADMIN", s->server_admin); /* Apache */
table_set (e, "SCRIPT_FILENAME", r->filename); /* Apache */
ap_snprintf(port, sizeof(port), "%d", ntohs(c->remote_addr.sin_port));
table_set (e, "REMOTE_PORT", port); /* Apache */
if (c->user) table_set(e, "REMOTE_USER", c->user);
if (c->auth_type) table_set(e, "AUTH_TYPE", c->auth_type);
rem_logname = get_remote_logname(r);
if (rem_logname) table_set(e, "REMOTE_IDENT", rem_logname);
/* Apache custom error responses. If we have redirected set two new vars */
if (r->prev) {
if (r->prev->args) table_set(e,"REDIRECT_QUERY_STRING", r->prev->args);
if (r->prev->uri) table_set (e, "REDIRECT_URL", r->prev->uri);
}
}
/* This "cute" little function comes about because the path info on
* filenames and URLs aren't always the same. So we take the two,
* and find as much of the two that match as possible.
*/
API_EXPORT(int) find_path_info (char *uri, char *path_info)
{
int lu = strlen(uri);
int lp = strlen(path_info);
while (lu-- && lp-- && uri[lu] == path_info[lp]);
if (lu == -1)
lu=0;
while (uri[lu] != '\0' && uri[lu] != '/')
lu++;
return lu;
}
/* Obtain the Request-URI from the original request-line, returning
* a new string from the request pool containing the URI or "".
*/
static char *original_uri(request_rec *r)
{
char *first, *last;
if (r->the_request == NULL)
return (char *)pcalloc(r->pool, 1);
first = r->the_request; /* use the request-line */
while (*first && !isspace(*first)) ++first; /* skip over the method */
while (isspace(*first)) ++first; /* and the space(s) */
last = first;
while (*last && !isspace(*last)) ++last; /* end at next whitespace */
return pstrndup(r->pool, first, last - first);
}
API_EXPORT(void) add_cgi_vars(request_rec *r)
{
table *e = r->subprocess_env;
table_set (e, "GATEWAY_INTERFACE","CGI/1.1");
table_set (e, "SERVER_PROTOCOL", r->protocol);
table_set (e, "REQUEST_METHOD", r->method);
table_set (e, "QUERY_STRING", r->args ? r->args : "");
table_set (e, "REQUEST_URI", original_uri(r));
/* Note that the code below special-cases scripts run from includes,
* because it "knows" that the sub_request has been hacked to have the
* args and path_info of the original request, and not any that may have
* come with the script URI in the include command. Ugh.
*/
if (!strcmp (r->protocol, "INCLUDED")) {
table_set (e, "SCRIPT_NAME", r->uri);
if (r->path_info && *r->path_info)
table_set (e, "PATH_INFO", r->path_info);
} else if (!r->path_info || !*r->path_info) {
table_set (e, "SCRIPT_NAME", r->uri);
} else {
int path_info_start = find_path_info (r->uri, r->path_info);
table_set (e, "SCRIPT_NAME", pstrndup(r->pool, r->uri,
path_info_start));
table_set (e, "PATH_INFO", r->path_info);
}
if (r->path_info && r->path_info[0]) {
/*
* To get PATH_TRANSLATED, treat PATH_INFO as a URI path.
* Need to re-escape it for this, since the entire URI was
* un-escaped before we determined where the PATH_INFO began.
*/
request_rec *pa_req = sub_req_lookup_uri(
escape_uri(r->pool, r->path_info), r);
/* Don't bother destroying pa_req --- it's only created in
* child processes which are about to jettison their address
* space anyway. BTW, we concatenate filename and path_info
* from the sub_request to be compatible in case the PATH_INFO
* is pointing to an object which doesn't exist.
*/
if (pa_req->filename)
table_set (e, "PATH_TRANSLATED",
pstrcat (r->pool, pa_req->filename, pa_req->path_info,
NULL));
}
}
API_EXPORT(int) scan_script_header_err(request_rec *r, FILE *f, char *buffer)
{
char x[MAX_STRING_LEN];
char *w, *l;
int p;
if (buffer) *buffer = '\0';
w = buffer ? buffer : x;
hard_timeout ("read script header", r);
while(1) {
if (fgets(w, MAX_STRING_LEN-1, f) == NULL) {
kill_timeout (r);
log_reason ("Premature end of script headers", r->filename, r);
return SERVER_ERROR;
}
/* Delete terminal (CR?)LF */
p = strlen(w);
if (p > 0 && w[p-1] == '\n')
{
if (p > 1 && w[p-2] == '\015') w[p-2] = '\0';
else w[p-1] = '\0';
}
if(w[0] == '\0') {
kill_timeout (r);
return OK;
}
/* if we see a bogus header don't ignore it. Shout and scream */
if(!(l = strchr(w,':'))) {
char malformed[(sizeof MALFORMED_MESSAGE)+1+MALFORMED_HEADER_LENGTH_TO_SHOW];
strcpy(malformed, MALFORMED_MESSAGE);
strncat(malformed, w, MALFORMED_HEADER_LENGTH_TO_SHOW);
if (!buffer)
/* Soak up all the script output --- may save an outright kill */
while (fgets(w, MAX_STRING_LEN-1, f) != NULL)
continue;
kill_timeout (r);
log_reason (malformed, r->filename, r);
return SERVER_ERROR;
}
*l++ = '\0';
while (*l && isspace (*l)) ++l;
if(!strcasecmp(w,"Content-type")) {
/* Nuke trailing whitespace */
char *endp = l + strlen(l) - 1;
while (endp > l && isspace(*endp)) *endp-- = '\0';
r->content_type = pstrdup (r->pool, l);
}
else if(!strcasecmp(w,"Status")) {
sscanf(l, "%d", &r->status);
r->status_line = pstrdup(r->pool, l);
}
else if(!strcasecmp(w,"Location")) {
table_set (r->headers_out, w, l);
}
else if(!strcasecmp(w,"Content-Length")) {
table_set (r->headers_out, w, l);
}
else if(!strcasecmp(w,"Transfer-Encoding")) {
table_set (r->headers_out, w, l);
}
/* The HTTP specification says that it is legal to merge duplicate
* headers into one. Some browsers that support Cookies don't like
* merged headers and prefer that each Set-Cookie header is sent
* separately. Lets humour those browsers.
*/
else if(!strcasecmp(w, "Set-Cookie")) {
table_add(r->err_headers_out, w, l);
}
else {
table_merge (r->err_headers_out, w, l);
}
}
}
API_EXPORT(void) send_size(size_t size, request_rec *r) {
char ss[20];
if(size == -1)
strcpy(ss, " -");
else if(!size)
strcpy(ss, " 0k");
else if(size < 1024)
strcpy(ss, " 1k");
else if(size < 1048576)
ap_snprintf(ss, sizeof(ss), "%4dk", (size + 512) / 1024);
else if(size < 103809024)
ap_snprintf(ss, sizeof(ss), "%4.1fM", size / 1048576.0);
else
ap_snprintf(ss, sizeof(ss), "%4dM", (size + 524288) / 1048576);
rputs(ss, r);
}
#if defined(__EMX__) || defined(WIN32)
static char **create_argv_cmd(pool *p, char *av0, const char *args, char *path)
{
register int x,n;
char **av;
char *w;
for(x=0,n=2;args[x];x++)
if(args[x] == '+') ++n;
/* Add extra strings to array. */
n = n + 2;
av = (char **)palloc(p, (n+1)*sizeof(char *));
av[0] = av0;
/* Now insert the extra strings we made room for above. */
av[1] = strdup("/C");
av[2] = strdup(path);
for(x=(1+2);x<n;x++) {
w = getword(p, &args, '+');
unescape_url(w);
av[x] = escape_shell_cmd(p, w);
}
av[n] = NULL;
return av;
}
#endif
API_EXPORT(int) call_exec (request_rec *r, char *argv0, char **env, int shellcmd)
{
int pid = 0;
#if defined(RLIMIT_CPU) || defined(RLIMIT_NPROC) || \
defined(RLIMIT_DATA) || defined(RLIMIT_VMEM)
core_dir_config *conf =
(core_dir_config *)get_module_config(r->per_dir_config, &core_module);
#endif
/* the fd on r->server->error_log is closed, but we need somewhere to
* put the error messages from the log_* functions. So, we use stderr,
* since that is better than allowing errors to go unnoticed.
*/
r->server->error_log = stderr;
#ifdef RLIMIT_CPU
if (conf->limit_cpu != NULL)
if ((setrlimit (RLIMIT_CPU, conf->limit_cpu)) != 0)
log_unixerr("setrlimit", NULL, "failed to set CPU usage limit",
r->server);
#endif
#ifdef RLIMIT_NPROC
if (conf->limit_nproc != NULL)
if ((setrlimit (RLIMIT_NPROC, conf->limit_nproc)) != 0)
log_unixerr("setrlimit", NULL, "failed to set process limit",
r->server);
#endif
#ifdef RLIMIT_DATA
if (conf->limit_mem != NULL)
if ((setrlimit (RLIMIT_DATA, conf->limit_mem)) != 0)
log_unixerr("setrlimit", NULL, "failed to set memory usage limit",
r->server);
#endif
#ifdef RLIMIT_VMEM
if (conf->limit_mem != NULL)
if ((setrlimit (RLIMIT_VMEM, conf->limit_mem)) != 0)
log_unixerr("setrlimit", NULL, "failed to set memory usage limit",
r->server);
#endif
#ifdef __EMX__
{
/* Additions by Alec Kloss, to allow exec'ing of scripts under OS/2 */
int is_script;
char interpreter[2048]; /* hope this is large enough for the interpreter path */
FILE * program;
program = fopen (r->filename, "r");
if (!program) {
char err_string[HUGE_STRING_LEN];
ap_snprintf(err_string, sizeof(err_string),
"open of %s failed, reason: fopen: %s (errno = %d)\n",
r->filename, strerror(errno), errno);
/* write(2, err_string, strlen(err_string)); */
/* exit(0); */
log_unixerr("fopen", NULL, err_string, r->server);
return(pid);
}
fgets (interpreter, sizeof(interpreter), program);
fclose (program);
if (!strncmp (interpreter, "#!", 2)) {
is_script = 1;
interpreter[strlen(interpreter)-1] = '\0';
} else {
is_script = 0;
}
if ((!r->args) || (!r->args[0]) || (ind(r->args,'=') >= 0)) {
int emxloop;
char *emxtemp;
/* For OS/2 place the variables in the current
enviornment then it will be inherited. This way
the program will also get all of OS/2's other SETs. */
for (emxloop=0; ((emxtemp = env[emxloop]) != NULL); emxloop++)
putenv(emxtemp);
/* Additions by Alec Kloss, to allow exec'ing of scripts under OS/2 */
if (is_script) {
/* here's the stuff to run the interpreter */
execl (interpreter+2, interpreter+2, r->filename, NULL);
} else
if (strstr(strupr(r->filename), ".CMD") > 0) {
/* Special case to allow use of REXX commands as scripts. */
os2pathname(r->filename);
execl("CMD.EXE", "CMD.EXE", "/C", r->filename, NULL);
}
else {
execl(r->filename, argv0, NULL);
}
}
else {
int emxloop;
char *emxtemp;
/* For OS/2 place the variables in the current
environment so that they will be inherited. This way
the program will also get all of OS/2's other SETs. */
for (emxloop=0; ((emxtemp = env[emxloop]) != NULL); emxloop++)
putenv(emxtemp);
if (strstr(strupr(r->filename), ".CMD") > 0) {
/* Special case to allow use of REXX commands as scripts. */
os2pathname(r->filename);
execv("CMD.EXE", create_argv_cmd(r->pool, argv0, r->args, r->filename));
}
else
execv(r->filename,
create_argv(r->pool, NULL, NULL, NULL, argv0, r->args));
}
return(pid);
}
#elif defined(WIN32)
{
/* Adapted from work by Alec Kloss, to allow exec'ing of scripts under OS/2 */
int is_script = 0;
int is_binary = 0;
char interpreter[2048]; /* hope this is large enough for the interpreter path */
FILE * program;
int i, sz;
char *dot;
char *exename;
int is_exe = 0;
interpreter[0] = 0;
exename = strrchr(r->filename, '/');
if(!exename)
exename = strrchr(r->filename, '\\');
if(!exename)
exename = r->filename;
else
exename++;
dot = strrchr(exename, '.');
if(dot)
{
if(!strcasecmp(dot, ".BAT") ||
!strcasecmp(dot, ".EXE") ||
!strcasecmp(dot, ".COM"))
is_exe = 1;
}
if(!is_exe)
{
program = fopen (r->filename, "rb");
if (!program) {
char err_string[HUGE_STRING_LEN];
ap_snprintf(err_string, sizeof(err_string), "open of %s failed, errno is %d\n", r->filename, errno);
/* write(2, err_string, strlen(err_string)); */
/* exit(0); */
log_unixerr("fopen", NULL, err_string, r->server);
return(pid);
}
sz = fread (interpreter, 1, sizeof(interpreter)-1, program);
if(sz < 0) {
char err_string[HUGE_STRING_LEN];
ap_snprintf(err_string, sizeof(err_string), "open of %s failed, errno is %d\n", r->filename, errno);
log_unixerr("fread", NULL, err_string, r->server);
fclose(program);
return(pid);
}
interpreter[sz] = 0;
fclose (program);
if (!strncmp (interpreter, "#!", 2)) {
is_script = 1;
for(i=2; i<sizeof(interpreter); i++)
{
if((interpreter[i] == '\r') ||
(interpreter[i] == '\n'))
break;
}
interpreter[i] = 0;
} else {
/*
* check and see how many control chars. On
* that basis, I will classify it as a text
* or binary file
*/
int ctrl = 0;
for(i=0; i<sz; i++)
{
static char *spec = "\r\n\t";
if(iscntrl(interpreter[i]) && !strchr(spec, interpreter[i]))
ctrl++;
}
if(ctrl > sz/10)
is_binary = 1;
else
is_binary = 0;
}
}
if ((!r->args) || (!r->args[0]) || (ind(r->args,'=') >= 0)) {
if (is_exe || is_binary) {
pid = spawnle(_P_NOWAIT, r->filename, r->filename, NULL, env);
} else if(is_script) {
pid = spawnle(_P_NOWAIT, interpreter+2, interpreter+2, r->filename, NULL, env);
} else {
pid = spawnle(_P_NOWAIT, "CMD.EXE", "CMD.EXE", "/C", r->filename, NULL, env);
}
}
else {
if (is_exe || is_binary) {
pid = spawnve(_P_NOWAIT, r->filename, create_argv(r->pool, argv0, NULL, NULL, r->args, (void *)NULL), env);
} else if(is_script) {
ap_assert(0);
pid = spawnve(_P_NOWAIT, interpreter+2, create_argv(r->pool, interpreter+2, NULL, NULL, r->filename, r->args), env);
} else {
pid = spawnve(_P_NOWAIT, "CMD.EXE", create_argv_cmd(r->pool, argv0, r->args, r->filename), env);
}
}
return(pid);
}
#else
if ( suexec_enabled &&
((r->server->server_uid != user_id) ||
(r->server->server_gid != group_id) ||
(!strncmp("/~",r->uri,2))) ) {
char *execuser, *grpname;
struct passwd *pw;
struct group *gr;
if (!strncmp("/~",r->uri,2)) {
gid_t user_gid;
char *username = pstrdup(r->pool, r->uri + 2);
int pos = ind(username, '/');
if (pos >= 0) username[pos] = '\0';
if ((pw = getpwnam(username)) == NULL) {
log_unixerr("getpwnam",username,"invalid username",r->server);
return(pid);
}
execuser = pstrcat(r->pool, "~", pw->pw_name, NULL);
user_gid = pw->pw_gid;
if ((gr = getgrgid(user_gid)) == NULL) {
if ((grpname = palloc (r->pool, 16)) == NULL)
return(pid);
else
ap_snprintf(grpname, 16, "%d", user_gid);
}
else
grpname = gr->gr_name;
}
else {
if ((pw = getpwuid (r->server->server_uid)) == NULL) {
log_unixerr("getpwuid", NULL, "invalid userid", r->server);
return(pid);
}
execuser = pstrdup(r->pool, pw->pw_name);
if ((gr = getgrgid (r->server->server_gid)) == NULL) {
log_unixerr("getgrgid", NULL, "invalid groupid", r->server);
return(pid);
}
grpname = gr->gr_name;
}
if (shellcmd)
execle(SUEXEC_BIN, SUEXEC_BIN, execuser, grpname, argv0, NULL, env);
else if((!r->args) || (!r->args[0]) || (ind(r->args,'=') >= 0))
execle(SUEXEC_BIN, SUEXEC_BIN, execuser, grpname, argv0, NULL, env);
else {
execve(SUEXEC_BIN,
create_argv(r->pool, SUEXEC_BIN, execuser, grpname,
argv0, r->args),
env);
}
}
else {
if (shellcmd)
execle(SHELL_PATH, SHELL_PATH, "-c", argv0, NULL, env);
else if((!r->args) || (!r->args[0]) || (ind(r->args,'=') >= 0))
execle(r->filename, argv0, NULL, env);
else
execve(r->filename,
create_argv(r->pool, NULL, NULL, NULL, argv0, r->args),
env);
}
return(pid);
#endif
}
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