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apache / httpd / 2750722c2140a273c113561fb20b940a44c85727 / . / modules / generators / mod_cgid.c
blob: 26946a9657388e2fc1cd20509d26b76f9a01874c [file] [log] [blame]
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 The Apache Software Foundation. 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. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``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 SOFTWARE FOUNDATION 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 Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/*
* http_script: keeps all script-related ramblings together.
*
* Compliant to cgi/1.1 spec
*
* Adapted by rst from original NCSA code by Rob McCool
*
* Apache adds some new env vars; REDIRECT_URL and REDIRECT_QUERY_STRING for
* custom error responses, and DOCUMENT_ROOT because we found it useful.
* It also adds SERVER_ADMIN - useful for scripts to know who to mail when
* they fail.
*/
#include "apr_lib.h"
#include "apr_strings.h"
#include "apr_general.h"
#include "apr_file_io.h"
#include "apr_portable.h"
#include "apr_buckets.h"
#include "apr_optional.h"
#include "apr_signal.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#if APR_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#define CORE_PRIVATE
#include "util_filter.h"
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_protocol.h"
#include "http_main.h"
#include "http_log.h"
#include "util_script.h"
#include "ap_mpm.h"
#include "unixd.h"
#include "mod_suexec.h"
#include "../filters/mod_include.h"
#include "mod_core.h"
/* ### should be tossed in favor of APR */
#include <sys/stat.h>
#include <sys/un.h> /* for sockaddr_un */
module AP_MODULE_DECLARE_DATA cgid_module;
static void cgid_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *main_server);
static int handle_exec(include_ctx_t *ctx, apr_bucket_brigade **bb, request_rec *r,
ap_filter_t *f, apr_bucket *head_ptr, apr_bucket **inserted_head);
static APR_OPTIONAL_FN_TYPE(ap_register_include_handler) *cgid_pfn_reg_with_ssi;
static APR_OPTIONAL_FN_TYPE(ap_ssi_get_tag_and_value) *cgid_pfn_gtv;
static APR_OPTIONAL_FN_TYPE(ap_ssi_parse_string) *cgid_pfn_ps;
static apr_pool_t *pcgi;
static int total_modules = 0;
/* KLUDGE --- for back-combatibility, we don't have to check Execcgid
* in ScriptAliased directories, which means we need to know if this
* request came through ScriptAlias or not... so the Alias module
* leaves a note for us.
*/
static int is_scriptaliased(request_rec *r)
{
const char *t = apr_table_get(r->notes, "alias-forced-type");
return t && (!strcasecmp(t, "cgi-script"));
}
/* Configuration stuff */
#define DEFAULT_LOGBYTES 10385760
#define DEFAULT_BUFBYTES 1024
#define DEFAULT_SOCKET "logs/cgisock"
#define SHELL_PATH "/bin/sh"
#define CGI_REQ 1
#define SSI_REQ 2
/* DEFAULT_CGID_LISTENBACKLOG controls the max depth on the unix socket's
* pending connection queue. If a bunch of cgi requests arrive at about
* the same time, connections from httpd threads/processes will back up
* in the queue while the cgid process slowly forks off a child to process
* each connection on the unix socket. If the queue is too short, the
* httpd process will get ECONNREFUSED when trying to connect.
*/
#ifndef DEFAULT_CGID_LISTENBACKLOG
#define DEFAULT_CGID_LISTENBACKLOG 100
#endif
typedef struct {
const char *sockname;
const char *logname;
long logbytes;
int bufbytes;
} cgid_server_conf;
/* 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.
*
* XXXX: note that the WIN32 code uses one of the suexec strings
* to pass an interpreter name. Remember this if changing the way they
* are handled in create_argv.
*
*/
static char **create_argv(apr_pool_t *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 **) apr_pcalloc(p, (numwords + 5) * sizeof(char *));
if (path) {
av[idx++] = path;
}
if (user) {
av[idx++] = user;
}
if (group) {
av[idx++] = group;
}
av[idx++] = apr_pstrdup(p, av0);
for (x = 1; x <= numwords; x++) {
w = ap_getword_nulls(p, &args, '+');
if (strcmp(w, "")) {
ap_unescape_url(w);
av[idx++] = ap_escape_shell_cmd(p, w);
}
}
av[idx] = NULL;
return av;
}
#if APR_HAS_OTHER_CHILD
static void cgid_maint(int reason, void *data, apr_wait_t status)
{
pid_t *sd = data;
switch (reason) {
case APR_OC_REASON_DEATH:
/* don't do anything; server is stopping or restarting */
break;
case APR_OC_REASON_LOST:
/* it would be better to restart just the cgid child
* process but for now we'll gracefully restart the entire
* server by sending SIGWINCH to ourself, the httpd parent
* process
*/
kill(getpid(), SIGWINCH);
break;
case APR_OC_REASON_RESTART:
apr_proc_other_child_unregister(data);
break;
case APR_OC_REASON_UNREGISTER:
/* we get here when pcgi is cleaned up; pcgi gets cleaned
* up when pconf gets cleaned up
*/
kill(*sd, SIGHUP);
break;
}
}
#endif
static void get_req(int fd, request_rec *r, char **argv0, char ***env, int *req_type)
{
int i, len, j;
unsigned char *data;
char **environ;
core_dir_config *temp_core;
void **dconf;
module *suexec_mod = ap_find_linked_module("mod_suexec.c");
r->server = apr_pcalloc(r->pool, sizeof(server_rec));
read(fd, req_type, sizeof(int));
read(fd, &j, sizeof(int));
read(fd, &len, sizeof(int));
data = apr_pcalloc(r->pool, len + 1); /* get a cleared byte for final '\0' */
i = read(fd, data, len);
r->filename = ap_getword(r->pool, (const char **)&data, '\n');
*argv0 = ap_getword(r->pool, (const char **)&data, '\n');
r->uri = ap_getword(r->pool, (const char **)&data, '\n');
environ = apr_pcalloc(r->pool, (j + 2) *sizeof(char *));
i = 0;
for (i = 0; i < j; i++) {
environ[i] = ap_getword(r->pool, (const char **)&data, '\n');
}
*env = environ;
r->args = ap_getword(r->pool, (const char **)&data, '\n');
read(fd, &i, sizeof(int));
/* add 1, so that if i == 0, we still malloc something. */
dconf = (void **) apr_pcalloc(r->pool, sizeof(void *) * (total_modules + DYNAMIC_MODULE_LIMIT));
temp_core = (core_dir_config *)apr_palloc(r->pool, sizeof(core_module));
dconf[i] = (void *)temp_core;
if (suexec_mod) {
suexec_config_t *suexec_cfg = apr_pcalloc(r->pool, sizeof(*suexec_cfg));
read(fd, &i, sizeof(int));
read(fd, &suexec_cfg->ugid.uid, sizeof(uid_t));
read(fd, &suexec_cfg->ugid.gid, sizeof(gid_t));
read(fd, &suexec_cfg->active, sizeof(int));
dconf[i] = (void *)suexec_cfg;
}
r->per_dir_config = (ap_conf_vector_t *)dconf;
#if 0
#ifdef RLIMIT_CPU
read(fd, &j, sizeof(int));
if (j) {
temp_core->limit_cpu = (struct rlimit *)apr_palloc (sizeof(struct rlimit));
read(fd, temp_core->limit_cpu, sizeof(struct rlimit));
}
else {
temp_core->limit_cpu = NULL;
}
#endif
#if defined (RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)
read(fd, &j, sizeof(int));
if (j) {
temp_core->limit_mem = (struct rlimit *)apr_palloc(r->pool, sizeof(struct rlimit));
read(fd, temp_core->limit_mem, sizeof(struct rlimit));
}
else {
temp_core->limit_mem = NULL;
}
#endif
#ifdef RLIMIT_NPROC
read(fd, &j, sizeof(int));
if (j) {
temp_core->limit_nproc = (struct rlimit *)apr_palloc(r->pool, sizeof(struct rlimit));
read(fd, temp_core->limit_nproc, sizeof(struct rlimit));
}
else {
temp_core->limit_nproc = NULL;
}
#endif
#endif
/* For right now, just make the notes table. At some point we will need
* to actually fill this out, but for now we just don't want suexec to
* seg fault.
*/
r->notes = apr_table_make(r->pool, 1);
}
static void send_req(int fd, request_rec *r, char *argv0, char **env, int req_type)
{
int len, r_type = req_type;
int i = 0;
char *data;
module *suexec_mod = ap_find_linked_module("mod_suexec.c");
data = apr_pstrcat(r->pool, r->filename, "\n", argv0, "\n", r->uri, "\n",
NULL);
for (i =0; env[i]; i++) {
continue;
}
/* Write the request type (SSI "exec cmd" or cgi). */
if (write(fd, &r_type, sizeof(int)) < 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,
"write to cgi daemon process");
}
/* Write the number of entries in the environment. */
if (write(fd, &i, sizeof(int)) < 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,
"write to cgi daemon process");
}
for (i = 0; env[i]; i++) {
data = apr_pstrcat(r->pool, data, env[i], "\n", NULL);
}
data = apr_pstrcat(r->pool, data, r->args, NULL);
len = strlen(data);
/* Write the length of the concatenated env string. */
if (write(fd, &len, sizeof(int)) < 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,
"write to cgi daemon process");
}
/* Write the concatted env string. */
if (write(fd, data, len) < 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,
"write to cgi daemon process");
}
/* Write module_index id value. */
if (write(fd, &core_module.module_index, sizeof(int)) < 0) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,
"write to cgi daemon process");
}
if (suexec_mod) {
suexec_config_t *suexec_cfg = ap_get_module_config(r->per_dir_config,
suexec_mod);
write(fd, &suexec_mod->module_index, sizeof(int));
write(fd, &suexec_cfg->ugid.uid, sizeof(uid_t));
write(fd, &suexec_cfg->ugid.gid, sizeof(gid_t));
write(fd, &suexec_cfg->active, sizeof(int));
}
#if 0
#ifdef RLIMIT_CPU
if (conf->limit_cpu) {
len = 1;
write(fd, &len, sizeof(int));
write(fd, conf->limit_cpu, sizeof(struct rlimit));
}
else {
len = 0;
write(fd, &len, sizeof(int));
}
#endif
#if defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)
if (conf->limit_mem) {
len = 1;
write(fd, &len, sizeof(int));
write(fd, conf->limit_mem, sizeof(struct rlimit));
}
else {
len = 0;
write(fd, &len, sizeof(int));
}
#endif
#ifdef RLIMIT_NPROC
if (conf->limit_nproc) {
len = 1;
write(fd, &len, sizeof(int));
write(fd, conf->limit_nproc, sizeof(struct rlimit));
}
else {
len = 0;
write(fd, &len, sizeof(int));
}
#endif
#endif
}
static int cgid_server(void *data)
{
struct sockaddr_un unix_addr;
int sd, sd2, rc, req_type;
mode_t omask;
apr_socklen_t len;
apr_pool_t *ptrans;
server_rec *main_server = data;
cgid_server_conf *sconf = ap_get_module_config(main_server->module_config,
&cgid_module);
apr_pool_create(&ptrans, pcgi);
apr_signal(SIGCHLD, SIG_IGN);
if (unlink(sconf->sockname) < 0 && errno != ENOENT) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server,
"Couldn't unlink unix domain socket %s",
sconf->sockname);
/* just a warning; don't bail out */
}
if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server,
"Couldn't create unix domain socket");
return errno;
}
memset(&unix_addr, 0, sizeof(unix_addr));
unix_addr.sun_family = AF_UNIX;
strcpy(unix_addr.sun_path, sconf->sockname);
omask = umask(0077); /* so that only Apache can use socket */
rc = bind(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr));
umask(omask); /* can't fail, so can't clobber errno */
if (rc < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server,
"Couldn't bind unix domain socket %s",
sconf->sockname);
return errno;
}
if (listen(sd, DEFAULT_CGID_LISTENBACKLOG) < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server,
"Couldn't listen on unix domain socket");
return errno;
}
if (!geteuid()) {
if (chown(sconf->sockname, unixd_config.user_id, -1) < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server,
"Couldn't change owner of unix domain socket %s",
sconf->sockname);
return errno;
}
}
unixd_setup_child(); /* if running as root, switch to configured user/group */
while (1) {
int errfileno = STDERR_FILENO;
char *argv0;
char **env;
const char * const *argv;
apr_int32_t in_pipe = APR_CHILD_BLOCK;
apr_int32_t out_pipe = APR_CHILD_BLOCK;
apr_int32_t err_pipe = APR_CHILD_BLOCK;
apr_cmdtype_e cmd_type = APR_PROGRAM;
request_rec *r;
apr_procattr_t *procattr = NULL;
apr_proc_t *procnew = NULL;
apr_file_t *inout;
apr_pool_clear(ptrans);
len = sizeof(unix_addr);
sd2 = accept(sd, (struct sockaddr *)&unix_addr, &len);
if (sd2 < 0) {
if (errno != EINTR) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno,
(server_rec *)data,
"Error accepting on cgid socket.");
}
continue;
}
r = apr_pcalloc(ptrans, sizeof(request_rec));
procnew = apr_pcalloc(ptrans, sizeof(*procnew));
r->pool = ptrans;
get_req(sd2, r, &argv0, &env, &req_type);
apr_os_file_put(&r->server->error_log, &errfileno, r->pool);
apr_os_file_put(&inout, &sd2, r->pool);
if (req_type == SSI_REQ) {
in_pipe = APR_NO_PIPE;
out_pipe = APR_FULL_BLOCK;
err_pipe = APR_NO_PIPE;
cmd_type = APR_SHELLCMD;
}
if (((rc = apr_procattr_create(&procattr, ptrans)) != APR_SUCCESS) ||
((req_type == CGI_REQ) &&
(((rc = apr_procattr_io_set(procattr,
in_pipe,
out_pipe,
err_pipe)) != APR_SUCCESS) ||
/* XXX apr_procattr_child_*_set() is creating an unnecessary
* pipe between this process and the child being created...
* It is cleaned up with the temporary pool for this request.
*/
((rc = apr_procattr_child_err_set(procattr, r->server->error_log, NULL)) != APR_SUCCESS) ||
((rc = apr_procattr_child_in_set(procattr, inout, NULL)) != APR_SUCCESS))) ||
((rc = apr_procattr_child_out_set(procattr, inout, NULL)) != APR_SUCCESS) ||
((rc = apr_procattr_dir_set(procattr,
ap_make_dirstr_parent(r->pool, r->filename))) != APR_SUCCESS) ||
((rc = apr_procattr_cmdtype_set(procattr, cmd_type)) != APR_SUCCESS)) {
/* Something bad happened, tell the world. */
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r,
"couldn't set child process attributes: %s", r->filename);
}
else {
argv = (const char * const *)create_argv(r->pool, NULL, NULL, NULL, argv0, r->args);
/* We want to sd2 close for new CGI process too.
* If it's remained open it'll make ap_pass_brigade() block
* waiting for EOF if CGI forked something running long.
* close(sd2) here should be okay, as CGI channel
* is already dup()ed by apr_procattr_child_{in,out}_set()
* above.
*/
close(sd2);
rc = ap_os_create_privileged_process(r, procnew, argv0, argv,
(const char * const *)env,
procattr, ptrans);
if (rc != APR_SUCCESS) {
/* Bad things happened. Everyone should have cleaned up. */
ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r,
"couldn't create child process: %d: %s", rc, r->filename);
}
}
}
return -1;
}
static void cgid_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp,
server_rec *main_server)
{
pid_t pid;
apr_proc_t *procnew;
void *data;
int first_time = 0;
const char *userdata_key = "cgid_init";
module **m;
apr_pool_userdata_get(&data, userdata_key, main_server->process->pool);
if (!data) {
first_time = 1;
apr_pool_userdata_set((const void *)1, userdata_key,
apr_pool_cleanup_null, main_server->process->pool);
}
if (!first_time) {
total_modules = 0;
for (m = ap_preloaded_modules; *m != NULL; m++)
total_modules++;
if ((pid = fork()) < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server,
"Couldn't spawn cgid daemon process");
}
else if (pid == 0) {
apr_pool_create(&pcgi, p);
cgid_server(main_server);
exit(-1);
}
procnew = apr_pcalloc(p, sizeof(*procnew));
procnew->pid = pid;
procnew->err = procnew->in = procnew->out = NULL;
apr_pool_note_subprocess(p, procnew, kill_after_timeout);
#if APR_HAS_OTHER_CHILD
apr_proc_other_child_register(procnew, cgid_maint, &procnew->pid, NULL, p);
#endif
cgid_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler);
cgid_pfn_gtv = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_get_tag_and_value);
cgid_pfn_ps = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_parse_string);
if ((cgid_pfn_reg_with_ssi) && (cgid_pfn_gtv) && (cgid_pfn_ps)) {
/* Required by mod_include filter. This is how mod_cgid registers
* with mod_include to provide processing of the exec directive.
*/
cgid_pfn_reg_with_ssi("exec", handle_exec);
}
}
}
static void *create_cgid_config(apr_pool_t *p, server_rec *s)
{
cgid_server_conf *c =
(cgid_server_conf *) apr_pcalloc(p, sizeof(cgid_server_conf));
c->logname = NULL;
c->logbytes = DEFAULT_LOGBYTES;
c->bufbytes = DEFAULT_BUFBYTES;
c->sockname = ap_server_root_relative(p, DEFAULT_SOCKET);
return c;
}
static void *merge_cgid_config(apr_pool_t *p, void *basev, void *overridesv)
{
cgid_server_conf *base = (cgid_server_conf *) basev, *overrides = (cgid_server_conf *) overridesv;
return overrides->logname ? overrides : base;
}
static const char *set_scriptlog(cmd_parms *cmd, void *dummy, const char *arg)
{
server_rec *s = cmd->server;
cgid_server_conf *conf = ap_get_module_config(s->module_config,
&cgid_module);
conf->logname = arg;
return NULL;
}
static const char *set_scriptlog_length(cmd_parms *cmd, void *dummy, const char *arg)
{
server_rec *s = cmd->server;
cgid_server_conf *conf = ap_get_module_config(s->module_config,
&cgid_module);
conf->logbytes = atol(arg);
return NULL;
}
static const char *set_scriptlog_buffer(cmd_parms *cmd, void *dummy, const char *arg)
{
server_rec *s = cmd->server;
cgid_server_conf *conf = ap_get_module_config(s->module_config,
&cgid_module);
conf->bufbytes = atoi(arg);
return NULL;
}
static const char *set_script_socket(cmd_parms *cmd, void *dummy, const char *arg)
{
server_rec *s = cmd->server;
cgid_server_conf *conf = ap_get_module_config(s->module_config,
&cgid_module);
conf->sockname = ap_server_root_relative(cmd->pool, arg);
return NULL;
}
static const command_rec cgid_cmds[] =
{
AP_INIT_TAKE1("ScriptLog", set_scriptlog, NULL, RSRC_CONF,
"the name of a log for script debugging info"),
AP_INIT_TAKE1("ScriptLogLength", set_scriptlog_length, NULL, RSRC_CONF,
"the maximum length (in bytes) of the script debug log"),
AP_INIT_TAKE1("ScriptLogBuffer", set_scriptlog_buffer, NULL, RSRC_CONF,
"the maximum size (in bytes) to record of a POST request"),
AP_INIT_TAKE1("Scriptsock", set_script_socket, NULL, RSRC_CONF,
"the name of the socket to use for communication with "
"the cgi daemon."),
{NULL}
};
static int log_scripterror(request_rec *r, cgid_server_conf * conf, int ret,
apr_status_t rv, char *error)
{
apr_file_t *f = NULL;
struct stat finfo;
char time_str[APR_CTIME_LEN];
int log_flags = rv ? APLOG_ERR : APLOG_NOERRNO | APLOG_ERR;
ap_log_rerror(APLOG_MARK, log_flags, rv, r,
"%s: %s", error, r->filename);
if (!conf->logname ||
((stat(ap_server_root_relative(r->pool, conf->logname), &finfo) == 0)
&& (finfo.st_size > conf->logbytes)) ||
(apr_file_open(&f, ap_server_root_relative(r->pool, conf->logname),
APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT, r->pool) != APR_SUCCESS)) {
return ret;
}
/* "%% [Wed Jun 19 10:53:21 1996] GET /cgid-bin/printenv HTTP/1.0" */
apr_ctime(time_str, apr_time_now());
apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri,
r->args ? "?" : "", r->args ? r->args : "", r->protocol);
/* "%% 500 /usr/local/apache/cgid-bin */
apr_file_printf(f, "%%%% %d %s\n", ret, r->filename);
apr_file_printf(f, "%%error\n%s\n", error);
apr_file_close(f);
return ret;
}
static int log_script(request_rec *r, cgid_server_conf * conf, int ret,
char *dbuf, const char *sbuf, apr_file_t *script_in, apr_file_t *script_err)
{
apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);
apr_table_entry_t *hdrs = (apr_table_entry_t *) hdrs_arr->elts;
char argsbuffer[HUGE_STRING_LEN];
apr_file_t *f = NULL;
int i;
struct stat finfo;
char time_str[APR_CTIME_LEN];
if (!conf->logname ||
((stat(ap_server_root_relative(r->pool, conf->logname), &finfo) == 0)
&& (finfo.st_size > conf->logbytes)) ||
(apr_file_open(&f, ap_server_root_relative(r->pool, conf->logname),
APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT, r->pool) != APR_SUCCESS)) {
/* Soak up script output */
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_in) == 0)
continue;
if (script_err) {
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == 0)
continue;
}
return ret;
}
/* "%% [Wed Jun 19 10:53:21 1996] GET /cgid-bin/printenv HTTP/1.0" */
apr_ctime(time_str, apr_time_now());
apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri,
r->args ? "?" : "", r->args ? r->args : "", r->protocol);
/* "%% 500 /usr/local/apache/cgid-bin" */
apr_file_printf(f, "%%%% %d %s\n", ret, r->filename);
apr_file_puts("%request\n", f);
for (i = 0; i < hdrs_arr->nelts; ++i) {
if (!hdrs[i].key)
continue;
apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);
}
if ((r->method_number == M_POST || r->method_number == M_PUT)
&& *dbuf) {
apr_file_printf(f, "\n%s\n", dbuf);
}
apr_file_puts("%response\n", f);
hdrs_arr = apr_table_elts(r->err_headers_out);
hdrs = (apr_table_entry_t *) hdrs_arr->elts;
for (i = 0; i < hdrs_arr->nelts; ++i) {
if (!hdrs[i].key)
continue;
apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);
}
if (sbuf && *sbuf)
apr_file_printf(f, "%s\n", sbuf);
if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_in) == 0) {
apr_file_puts("%stdout\n", f);
apr_file_puts(argsbuffer, f);
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_in) == 0)
apr_file_puts(argsbuffer, f);
apr_file_puts("\n", f);
}
if (script_err) {
if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == 0) {
apr_file_puts("%stderr\n", f);
apr_file_puts(argsbuffer, f);
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == 0)
apr_file_puts(argsbuffer, f);
apr_file_puts("\n", f);
}
}
apr_file_close(script_in);
if (script_err) {
apr_file_close(script_err);
}
apr_file_close(f);
return ret;
}
/****************************************************************
*
* Actual cgid handling...
*/
static int cgid_handler(request_rec *r)
{
int retval, nph, dbpos = 0;
char *argv0, *dbuf = NULL;
apr_bucket_brigade *bb;
apr_bucket *b;
char argsbuffer[HUGE_STRING_LEN];
cgid_server_conf *conf;
int is_included;
int sd;
char **env;
struct sockaddr_un unix_addr;
apr_file_t *tempsock;
apr_size_t nbytes;
if(strcmp(r->handler,CGI_MAGIC_TYPE) && strcmp(r->handler,"cgi-script"))
return DECLINED;
if (r->method_number == M_OPTIONS) {
/* 99 out of 100 cgid scripts, this is all they support */
r->allowed |= (1 << M_GET);
r->allowed |= (1 << M_POST);
return DECLINED;
}
conf = ap_get_module_config(r->server->module_config, &cgid_module);
is_included = !strcmp(r->protocol, "INCLUDED");
if ((argv0 = strrchr(r->filename, '/')) != NULL)
argv0++;
else
argv0 = r->filename;
nph = !(strncmp(argv0, "nph-", 4));
if ((argv0 = strrchr(r->filename, '/')) != NULL)
argv0++;
else
argv0 = r->filename;
if (!(ap_allow_options(r) & OPT_EXECCGI) && !is_scriptaliased(r))
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"Options ExecCGI is off in this directory");
if (nph && is_included)
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"attempt to include NPH CGI script");
#if defined(OS2) || defined(WIN32)
#error mod_cgid does not work on this platform. If you teach it to, look
#error at mod_cgi.c for required code in this path.
#else
if (r->finfo.filetype == 0)
return log_scripterror(r, conf, HTTP_NOT_FOUND, 0,
"script not found or unable to stat");
#endif
if (r->finfo.filetype == APR_DIR)
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"attempt to invoke directory as script");
/*
if (!ap_suexec_enabled) {
if (!ap_can_exec(&r->finfo))
return log_scripterror(r, conf, HTTP_FORBIDDEN, 0,
"file permissions deny server execution");
}
*/
ap_add_common_vars(r);
ap_add_cgi_vars(r);
env = ap_create_environment(r->pool, r->subprocess_env);
if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, errno,
"unable to create socket to cgi daemon");
}
memset(&unix_addr, 0, sizeof(unix_addr));
unix_addr.sun_family = AF_UNIX;
strcpy(unix_addr.sun_path, conf->sockname);
if (connect(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) < 0) {
return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, errno,
"unable to connect to cgi daemon");
}
send_req(sd, r, argv0, env, CGI_REQ);
/* We are putting the tempsock variable into a file so that we can use
* a pipe bucket to send the data to the client.
*/
apr_os_file_put(&tempsock, &sd, r->pool);
if ((retval = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR)))
return retval;
if ((argv0 = strrchr(r->filename, '/')) != NULL)
argv0++;
else
argv0 = r->filename;
/* Transfer any put/post args, CERN style...
* Note that we already ignore SIGPIPE in the core server.
*/
if (ap_should_client_block(r)) {
int dbsize, len_read;
if (conf->logname) {
dbuf = apr_pcalloc(r->pool, conf->bufbytes + 1);
dbpos = 0;
}
while ((len_read =
ap_get_client_block(r, argsbuffer, HUGE_STRING_LEN)) > 0) {
if (conf->logname) {
if ((dbpos + len_read) > conf->bufbytes) {
dbsize = conf->bufbytes - dbpos;
}
else {
dbsize = len_read;
}
memcpy(dbuf + dbpos, argsbuffer, dbsize);
dbpos += dbsize;
}
nbytes = len_read;
apr_file_write(tempsock, argsbuffer, &nbytes);
if (nbytes < len_read) {
/* silly script stopped reading, soak up remaining message */
while (ap_get_client_block(r, argsbuffer, HUGE_STRING_LEN) > 0) {
/* dump it */
}
break;
}
}
}
/* we're done writing, or maybe we didn't write at all;
* force EOF on child's stdin so that the cgi detects end (or
* absence) of data
*/
shutdown(sd, 1);
/* Handle script return... */
if (!nph) {
const char *location;
char sbuf[MAX_STRING_LEN];
int ret;
if ((ret = ap_scan_script_header_err(r, tempsock, sbuf))) {
return log_script(r, conf, ret, dbuf, sbuf, tempsock, NULL);
}
location = apr_table_get(r->headers_out, "Location");
if (location && location[0] == '/' && r->status == 200) {
/* Soak up all the script output */
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, tempsock) > 0) {
continue;
}
/* This redirect needs to be a GET no matter what the original
* method was.
*/
r->method = apr_pstrdup(r->pool, "GET");
r->method_number = M_GET;
/* We already read the message body (if any), so don't allow
* the redirected request to think it has one. We can ignore
* Transfer-Encoding, since we used REQUEST_CHUNKED_ERROR.
*/
apr_table_unset(r->headers_in, "Content-Length");
ap_internal_redirect_handler(location, r);
return OK;
}
else if (location && r->status == 200) {
/* XX Note that if a script wants to produce its own Redirect
* body, it now has to explicitly *say* "Status: 302"
*/
return HTTP_MOVED_TEMPORARILY;
}
if (!r->header_only) {
bb = apr_brigade_create(r->pool);
b = apr_bucket_pipe_create(tempsock);
APR_BRIGADE_INSERT_TAIL(bb, b);
b = apr_bucket_eos_create();
APR_BRIGADE_INSERT_TAIL(bb, b);
ap_pass_brigade(r->output_filters, bb);
}
}
if (nph) {
bb = apr_brigade_create(r->pool);
b = apr_bucket_pipe_create(tempsock);
APR_BRIGADE_INSERT_TAIL(bb, b);
b = apr_bucket_eos_create();
APR_BRIGADE_INSERT_TAIL(bb, b);
ap_pass_brigade(r->output_filters, bb);
}
apr_file_close(tempsock);
return OK; /* NOT r->status, even if it has changed. */
}
/*============================================================================
*============================================================================
* This is the beginning of the cgi filter code moved from mod_include. This
* is the code required to handle the "exec" SSI directive.
*============================================================================
*============================================================================*/
static int include_cgi(char *s, request_rec *r, ap_filter_t *next,
apr_bucket *head_ptr, apr_bucket **inserted_head)
{
request_rec *rr = ap_sub_req_lookup_uri(s, r, next);
int rr_status;
apr_bucket *tmp_buck, *tmp2_buck;
if (rr->status != HTTP_OK) {
ap_destroy_sub_req(rr);
return -1;
}
/* No hardwired path info or query allowed */
if ((rr->path_info && rr->path_info[0]) || rr->args) {
ap_destroy_sub_req(rr);
return -1;
}
if (rr->finfo.filetype != APR_REG) {
ap_destroy_sub_req(rr);
return -1;
}
/* Script gets parameters of the *document*, for back compatibility */
rr->path_info = r->path_info; /* hard to get right; see mod_cgi.c */
rr->args = r->args;
/* Force sub_req to be treated as a CGI request, even if ordinary
* typing rules would have called it something else.
*/
rr->content_type = CGI_MAGIC_TYPE;
/* Run it. */
rr_status = ap_run_sub_req(rr);
if (ap_is_HTTP_REDIRECT(rr_status)) {
apr_size_t len_loc, h_wrt;
const char *location = apr_table_get(rr->headers_out, "Location");
location = ap_escape_html(rr->pool, location);
len_loc = strlen(location);
tmp_buck = apr_bucket_immortal_create("<A HREF=\"", sizeof("<A HREF=\""));
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp_buck);
tmp2_buck = apr_bucket_heap_create(location, len_loc, 1, &h_wrt);
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);
tmp2_buck = apr_bucket_immortal_create("\">", sizeof("\">"));
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);
tmp2_buck = apr_bucket_heap_create(location, len_loc, 1, &h_wrt);
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);
tmp2_buck = apr_bucket_immortal_create("</A>", sizeof("</A>"));
APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);
if (*inserted_head == NULL) {
*inserted_head = tmp_buck;
}
}
ap_destroy_sub_req(rr);
return 0;
}
/* This is the special environment used for running the "exec cmd="
* variety of SSI directives.
*/
static void add_ssi_vars(request_rec *r, ap_filter_t *next)
{
apr_table_t *e = r->subprocess_env;
if (r->path_info && r->path_info[0] != '\0') {
request_rec *pa_req;
apr_table_setn(e, "PATH_INFO", ap_escape_shell_cmd(r->pool, r->path_info));
pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info), r, next);
if (pa_req->filename) {
apr_table_setn(e, "PATH_TRANSLATED",
apr_pstrcat(r->pool, pa_req->filename, pa_req->path_info, NULL));
}
ap_destroy_sub_req(pa_req);
}
if (r->args) {
char *arg_copy = apr_pstrdup(r->pool, r->args);
apr_table_setn(e, "QUERY_STRING", r->args);
ap_unescape_url(arg_copy);
apr_table_setn(e, "QUERY_STRING_UNESCAPED", ap_escape_shell_cmd(r->pool, arg_copy));
}
}
static int include_cmd(include_ctx_t *ctx, apr_bucket_brigade **bb, char *command,
request_rec *r, ap_filter_t *f)
{
char **env;
const char *location;
int sd;
int retval;
apr_bucket_brigade *bcgi;
apr_bucket *b;
struct sockaddr_un unix_addr;
apr_file_t *tempsock = NULL;
cgid_server_conf *conf = ap_get_module_config(r->server->module_config,
&cgid_module);
add_ssi_vars(r, f->next);
env = ap_create_environment(r->pool, r->subprocess_env);
if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, 0,
"unable to create socket to cgi daemon");
}
memset(&unix_addr, 0, sizeof(unix_addr));
unix_addr.sun_family = AF_UNIX;
strcpy(unix_addr.sun_path, conf->sockname);
if (connect(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) < 0) {
return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, 0,
"unable to connect to cgi daemon");
}
SPLIT_AND_PASS_PRETAG_BUCKETS(*bb, ctx, f->next);
send_req(sd, r, command, env, SSI_REQ);
/* We are putting the tempsock variable into a file so that we can use
* a pipe bucket to send the data to the client.
*/
apr_os_file_put(&tempsock, &sd, r->pool);
if ((retval = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR)))
return retval;
location = apr_table_get(r->headers_out, "Location");
if (location && location[0] == '/' && r->status == 200) {
char argsbuffer[HUGE_STRING_LEN];
/* Soak up all the script output */
while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, tempsock) > 0) {
continue;
}
/* This redirect needs to be a GET no matter what the original
* method was.
*/
r->method = apr_pstrdup(r->pool, "GET");
r->method_number = M_GET;
/* We already read the message body (if any), so don't allow
* the redirected request to think it has one. We can ignore
* Transfer-Encoding, since we used REQUEST_CHUNKED_ERROR.
*/
apr_table_unset(r->headers_in, "Content-Length");
ap_internal_redirect_handler(location, r);
return OK;
}
else if (location && r->status == 200) {
/* XX Note that if a script wants to produce its own Redirect
* body, it now has to explicitly *say* "Status: 302"
*/
return HTTP_MOVED_TEMPORARILY;
}
if (!r->header_only) {
bcgi = apr_brigade_create(r->pool);
b = apr_bucket_pipe_create(tempsock);
APR_BRIGADE_INSERT_TAIL(bcgi, b);
ap_pass_brigade(f->next, bcgi);
}
return 0;
}
static int handle_exec(include_ctx_t *ctx, apr_bucket_brigade **bb, request_rec *r,
ap_filter_t *f, apr_bucket *head_ptr, apr_bucket **inserted_head)
{
char *tag = NULL;
char *tag_val = NULL;
char *file = r->filename;
apr_bucket *tmp_buck;
char parsed_string[MAX_STRING_LEN];
*inserted_head = NULL;
if (ctx->flags & FLAG_PRINTING) {
if (ctx->flags & FLAG_NO_EXEC) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"exec used but not allowed in %s", r->filename);
CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);
}
else {
while (1) {
cgid_pfn_gtv(ctx, &tag, &tag_val, 1);
if (tag_val == NULL) {
if (tag == NULL) {
return (0);
}
else {
return 1;
}
}
if (!strcmp(tag, "cmd")) {
cgid_pfn_ps(r, tag_val, parsed_string, sizeof(parsed_string), 1);
if (include_cmd(ctx, bb, parsed_string, r, f) == -1) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"execution failure for parameter \"%s\" "
"to tag exec in file %s", tag, r->filename);
CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);
}
/* just in case some stooge changed directories */
}
else if (!strcmp(tag, "cgi")) {
cgid_pfn_ps(r, tag_val, parsed_string, sizeof(parsed_string), 0);
SPLIT_AND_PASS_PRETAG_BUCKETS(*bb, ctx, f->next);
if (include_cgi(parsed_string, r, f->next, head_ptr, inserted_head) == -1) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"invalid CGI ref \"%s\" in %s", tag_val, file);
CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);
}
}
else {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"unknown parameter \"%s\" to tag exec in %s", tag, file);
CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);
}
}
}
}
return 0;
}
/*============================================================================
*============================================================================
* This is the end of the cgi filter code moved from mod_include.
*============================================================================
*============================================================================*/
static void register_hook(apr_pool_t *p)
{
static const char * const aszPre[] = { "mod_include.c", NULL };
ap_hook_post_config(cgid_init, aszPre, NULL, APR_HOOK_MIDDLE);
ap_hook_handler(cgid_handler, NULL, NULL, APR_HOOK_MIDDLE);
}
module AP_MODULE_DECLARE_DATA cgid_module = {
STANDARD20_MODULE_STUFF,
NULL, /* dir config creater */
NULL, /* dir merger --- default is to override */
create_cgid_config, /* server config */
merge_cgid_config, /* merge server config */
cgid_cmds, /* command table */
register_hook /* register_handlers */
};