/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * http_script: keeps all script-related ramblings together. * * Compliant to cgi/1.1 spec * * Adapted by rst from original NCSA code by Rob McCool * * This modules uses a httpd core function (ap_add_common_vars) to add some new env vars, * like REDIRECT_URL and REDIRECT_QUERY_STRING for custom error responses and DOCUMENT_ROOT. * 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 #endif #if APR_HAVE_UNISTD_H #include #endif #if APR_HAVE_SYS_TYPES_H #include #endif #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 "mpm_common.h" #include "mod_suexec.h" #include "../filters/mod_include.h" #include "mod_core.h" /* ### should be tossed in favor of APR */ #include #include /* for sockaddr_un */ #if APR_HAVE_STRUCT_RLIMIT #if defined (RLIMIT_CPU) || defined (RLIMIT_NPROC) || defined (RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS) #define AP_CGID_USE_RLIMIT #endif #endif module AP_MODULE_DECLARE_DATA cgid_module; static int cgid_start(apr_pool_t *p, server_rec *main_server, apr_proc_t *procnew); static int 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, ap_filter_t *f, apr_bucket_brigade *bb); 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 = NULL; static pid_t daemon_pid; static int daemon_should_exit = 0; static server_rec *root_server = NULL; static apr_pool_t *root_pool = NULL; static const char *sockname; static struct sockaddr_un *server_addr; static apr_socklen_t server_addr_len; static pid_t parent_pid; static ap_unix_identity_t empty_ugid = { (uid_t)-1, (gid_t)-1, -1 }; typedef struct { apr_interval_time_t timeout; } cgid_dirconf; /* The APR other-child API doesn't tell us how the daemon exited * (SIGSEGV vs. exit(1)). The other-child maintenance function * needs to decide whether to restart the daemon after a failure * based on whether or not it exited due to a fatal startup error * or something that happened at steady-state. This exit status * is unlikely to collide with exit signals. */ #define DAEMON_STARTUP_ERROR 254 /* Read and discard the data in the brigade produced by a CGI script */ static void discard_script_output(apr_bucket_brigade *bb); /* This doer will only ever be called when we are sure that we have * a valid ugid. */ static ap_unix_identity_t *cgid_suexec_id_doer(const request_rec *r) { return (ap_unix_identity_t *) ap_get_module_config(r->request_config, &cgid_module); } /* KLUDGE --- for back-combatibility, we don't have to check ExecCGI * 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 "cgisock" #define CGI_REQ 1 #define SSI_REQ 2 #define GETPID_REQ 3 /* get the pid of script created for prior request */ #define ERRFN_USERDATA_KEY "CGIDCHILDERRFN" /* 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 /* DEFAULT_CONNECT_ATTEMPTS controls how many times we'll try to connect * to the cgi daemon from the thread/process handling the cgi request. * Generally we want to retry when we get ECONNREFUSED since it is * probably because the listen queue is full. We need to try harder so * the client doesn't see it as a 503 error. * * Set this to 0 to continually retry until the connect works or Apache * terminates. */ #ifndef DEFAULT_CONNECT_ATTEMPTS #define DEFAULT_CONNECT_ATTEMPTS 15 #endif #ifndef DEFAULT_CONNECT_STARTUP_DELAY #define DEFAULT_CONNECT_STARTUP_DELAY 60 #endif typedef struct { const char *logname; long logbytes; int bufbytes; } cgid_server_conf; #ifdef AP_CGID_USE_RLIMIT typedef struct { #ifdef RLIMIT_CPU int limit_cpu_set; struct rlimit limit_cpu; #endif #if defined (RLIMIT_DATA) || defined (RLIMIT_VMEM) || defined(RLIMIT_AS) int limit_mem_set; struct rlimit limit_mem; #endif #ifdef RLIMIT_NPROC int limit_nproc_set; struct rlimit limit_nproc; #endif } cgid_rlimit_t; #endif typedef struct { int req_type; /* request type (CGI_REQ, SSI_REQ, etc.) */ unsigned long conn_id; /* connection id; daemon uses this as a hash value * to find the script pid when it is time for that * process to be cleaned up */ pid_t ppid; /* sanity check for config problems leading to * wrong cgid socket use */ int env_count; ap_unix_identity_t ugid; apr_size_t filename_len; apr_size_t argv0_len; apr_size_t uri_len; apr_size_t args_len; int loglevel; /* to stuff in server_rec */ #ifdef AP_CGID_USE_RLIMIT cgid_rlimit_t limits; #endif } cgid_req_t; /* 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. * * Do not process the args if they containing an '=' assignment. */ 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; if (!(*args) || ap_strchr_c(args, '=')) { numwords = 0; } else { /* 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, '+'); 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) { apr_proc_t *proc = data; int mpm_state; int stopping; switch (reason) { case APR_OC_REASON_DEATH: apr_proc_other_child_unregister(data); /* If apache is not terminating or restarting, * restart the cgid daemon */ stopping = 1; /* if MPM doesn't support query, * assume we shouldn't restart daemon */ if (ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state) == APR_SUCCESS && mpm_state != AP_MPMQ_STOPPING) { stopping = 0; } if (!stopping) { if (status == DAEMON_STARTUP_ERROR) { ap_log_error(APLOG_MARK, APLOG_CRIT, 0, ap_server_conf, APLOGNO(01238) "cgid daemon failed to initialize"); } else { ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(01239) "cgid daemon process died, restarting"); cgid_start(root_pool, root_server, proc); } } break; case APR_OC_REASON_RESTART: /* don't do anything; server is stopping or restarting */ apr_proc_other_child_unregister(data); break; case APR_OC_REASON_LOST: /* Restart the child cgid daemon process */ apr_proc_other_child_unregister(data); cgid_start(root_pool, root_server, proc); break; case APR_OC_REASON_UNREGISTER: /* we get here when pcgi is cleaned up; pcgi gets cleaned * up when pconf gets cleaned up */ kill(proc->pid, SIGHUP); /* send signal to daemon telling it to die */ /* Remove the cgi socket, we must do it here in order to try and * guarantee the same permissions as when the socket was created. */ if (unlink(sockname) < 0 && errno != ENOENT) { ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf, APLOGNO(01240) "Couldn't unlink unix domain socket %s", sockname); } break; } } #endif static apr_status_t close_unix_socket(void *thefd) { int fd = (int)((long)thefd); return close(fd); } /* deal with incomplete reads and signals * assume you really have to read buf_size bytes */ static apr_status_t sock_read(int fd, void *vbuf, size_t buf_size) { char *buf = vbuf; int rc; size_t bytes_read = 0; do { do { rc = read(fd, buf + bytes_read, buf_size - bytes_read); } while (rc < 0 && errno == EINTR); switch(rc) { case -1: return errno; case 0: /* unexpected */ return ECONNRESET; default: bytes_read += rc; } } while (bytes_read < buf_size); return APR_SUCCESS; } /* deal with signals */ static apr_status_t sock_write(int fd, const void *buf, size_t buf_size) { int rc; do { rc = write(fd, buf, buf_size); } while (rc < 0 && errno == EINTR); if (rc < 0) { return errno; } return APR_SUCCESS; } static apr_status_t sock_writev(int fd, request_rec *r, int count, ...) { va_list ap; int rc; struct iovec *vec; int i; vec = (struct iovec *)apr_palloc(r->pool, count * sizeof(struct iovec)); va_start(ap, count); for (i = 0; i < count; i++) { vec[i].iov_base = va_arg(ap, caddr_t); vec[i].iov_len = va_arg(ap, apr_size_t); } va_end(ap); do { rc = writev(fd, vec, count); } while (rc < 0 && errno == EINTR); if (rc < 0) { return errno; } return APR_SUCCESS; } static apr_status_t get_req(int fd, request_rec *r, char **argv0, char ***env, cgid_req_t *req) { int i; char **environ; core_request_config *temp_core; void **rconf; apr_status_t stat; r->server = apr_pcalloc(r->pool, sizeof(server_rec)); /* read the request header */ stat = sock_read(fd, req, sizeof(*req)); if (stat != APR_SUCCESS) { return stat; } r->server->log.level = req->loglevel; if (req->req_type == GETPID_REQ) { /* no more data sent for this request */ return APR_SUCCESS; } /* handle module indexes and such */ rconf = (void **)ap_create_request_config(r->pool); temp_core = (core_request_config *)apr_palloc(r->pool, sizeof(core_module)); rconf[AP_CORE_MODULE_INDEX] = (void *)temp_core; r->request_config = (ap_conf_vector_t *)rconf; ap_set_module_config(r->request_config, &cgid_module, (void *)&req->ugid); /* Read the filename, argv0, uri, and args */ r->filename = apr_pcalloc(r->pool, req->filename_len + 1); *argv0 = apr_pcalloc(r->pool, req->argv0_len + 1); r->uri = apr_pcalloc(r->pool, req->uri_len + 1); if ((stat = sock_read(fd, r->filename, req->filename_len)) != APR_SUCCESS || (stat = sock_read(fd, *argv0, req->argv0_len)) != APR_SUCCESS || (stat = sock_read(fd, r->uri, req->uri_len)) != APR_SUCCESS) { return stat; } r->args = apr_pcalloc(r->pool, req->args_len + 1); /* empty string if no args */ if (req->args_len) { if ((stat = sock_read(fd, r->args, req->args_len)) != APR_SUCCESS) { return stat; } } /* read the environment variables */ environ = apr_pcalloc(r->pool, (req->env_count + 2) *sizeof(char *)); for (i = 0; i < req->env_count; i++) { apr_size_t curlen; if ((stat = sock_read(fd, &curlen, sizeof(curlen))) != APR_SUCCESS) { return stat; } environ[i] = apr_pcalloc(r->pool, curlen + 1); if ((stat = sock_read(fd, environ[i], curlen)) != APR_SUCCESS) { return stat; } } *env = environ; #ifdef AP_CGID_USE_RLIMIT if ((stat = sock_read(fd, &(req->limits), sizeof(cgid_rlimit_t))) != APR_SUCCESS) return stat; #endif return APR_SUCCESS; } static apr_status_t send_req(int fd, request_rec *r, char *argv0, char **env, int req_type) { int i; cgid_req_t req = {0}; apr_status_t stat; ap_unix_identity_t * ugid = ap_run_get_suexec_identity(r); core_dir_config *core_conf = ap_get_core_module_config(r->per_dir_config); if (ugid == NULL) { req.ugid = empty_ugid; } else { memcpy(&req.ugid, ugid, sizeof(ap_unix_identity_t)); } req.req_type = req_type; req.ppid = parent_pid; req.conn_id = r->connection->id; for (req.env_count = 0; env[req.env_count]; req.env_count++) { continue; } req.filename_len = strlen(r->filename); req.argv0_len = strlen(argv0); req.uri_len = strlen(r->uri); req.args_len = r->args ? strlen(r->args) : 0; req.loglevel = r->server->log.level; /* Write the request header */ if (req.args_len) { stat = sock_writev(fd, r, 5, &req, sizeof(req), r->filename, req.filename_len, argv0, req.argv0_len, r->uri, req.uri_len, r->args, req.args_len); } else { stat = sock_writev(fd, r, 4, &req, sizeof(req), r->filename, req.filename_len, argv0, req.argv0_len, r->uri, req.uri_len); } if (stat != APR_SUCCESS) { return stat; } /* write the environment variables */ for (i = 0; i < req.env_count; i++) { apr_size_t curlen = strlen(env[i]); if ((stat = sock_writev(fd, r, 2, &curlen, sizeof(curlen), env[i], curlen)) != APR_SUCCESS) { return stat; } } #if defined(RLIMIT_CPU) && defined(AP_CGID_USE_RLIMIT) if (core_conf->limit_cpu) { req.limits.limit_cpu = *(core_conf->limit_cpu); req.limits.limit_cpu_set = 1; } else { req.limits.limit_cpu_set = 0; } #endif #if defined(AP_CGID_USE_RLIMIT) && (defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)) if (core_conf->limit_mem) { req.limits.limit_mem = *(core_conf->limit_mem); req.limits.limit_mem_set = 1; } else { req.limits.limit_mem_set = 0; } #endif #if defined(RLIMIT_NPROC) && defined(AP_CGID_USE_RLIMIT) if (core_conf->limit_nproc) { req.limits.limit_nproc = *(core_conf->limit_nproc); req.limits.limit_nproc_set = 1; } else { req.limits.limit_nproc_set = 0; } #endif #ifdef AP_CGID_USE_RLIMIT if ( (stat = sock_write(fd, &(req.limits), sizeof(cgid_rlimit_t))) != APR_SUCCESS) return stat; #endif return APR_SUCCESS; } static void daemon_signal_handler(int sig) { if (sig == SIGHUP) { ++daemon_should_exit; } } static void cgid_child_errfn(apr_pool_t *pool, apr_status_t err, const char *description) { request_rec *r; void *vr; apr_pool_userdata_get(&vr, ERRFN_USERDATA_KEY, pool); r = vr; /* sure we got r, but don't call ap_log_rerror() because we don't * have r->headers_in and possibly other storage referenced by * ap_log_rerror() */ ap_log_error(APLOG_MARK, APLOG_ERR, err, r->server, APLOGNO(01241) "%s", description); } static int cgid_server(void *data) { int sd, sd2, rc; mode_t omask; apr_pool_t *ptrans; server_rec *main_server = data; apr_hash_t *script_hash = apr_hash_make(pcgi); apr_status_t rv; apr_pool_create(&ptrans, pcgi); apr_signal(SIGCHLD, SIG_IGN); apr_signal(SIGHUP, daemon_signal_handler); /* Close our copy of the listening sockets */ ap_close_listeners(); /* cgid should use its own suexec doer */ ap_hook_get_suexec_identity(cgid_suexec_id_doer, NULL, NULL, APR_HOOK_REALLY_FIRST); apr_hook_sort_all(); if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, APLOGNO(01242) "Couldn't create unix domain socket"); return errno; } omask = umask(0077); /* so that only Apache can use socket */ rc = bind(sd, (struct sockaddr *)server_addr, server_addr_len); umask(omask); /* can't fail, so can't clobber errno */ if (rc < 0) { ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, APLOGNO(01243) "Couldn't bind unix domain socket %s", sockname); return errno; } /* Not all flavors of unix use the current umask for AF_UNIX perms */ rv = apr_file_perms_set(sockname, APR_FPROT_UREAD|APR_FPROT_UWRITE|APR_FPROT_UEXECUTE); if (rv != APR_SUCCESS) { ap_log_error(APLOG_MARK, APLOG_CRIT, rv, main_server, APLOGNO(01244) "Couldn't set permissions on unix domain socket %s", sockname); return rv; } if (listen(sd, DEFAULT_CGID_LISTENBACKLOG) < 0) { ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, APLOGNO(01245) "Couldn't listen on unix domain socket"); return errno; } if (!geteuid()) { if (chown(sockname, ap_unixd_config.user_id, -1) < 0) { ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, APLOGNO(01246) "Couldn't change owner of unix domain socket %s", sockname); return errno; } } apr_pool_cleanup_register(pcgi, (void *)((long)sd), close_unix_socket, close_unix_socket); /* if running as root, switch to configured user/group */ if ((rc = ap_run_drop_privileges(pcgi, ap_server_conf)) != 0) { return rc; } while (!daemon_should_exit) { int errfileno = STDERR_FILENO; char *argv0 = NULL; char **env = NULL; const char * const *argv; apr_int32_t in_pipe; apr_int32_t out_pipe; apr_int32_t err_pipe; apr_cmdtype_e cmd_type; request_rec *r; apr_procattr_t *procattr = NULL; apr_proc_t *procnew = NULL; apr_file_t *inout; cgid_req_t cgid_req; apr_status_t stat; void *key; apr_socklen_t len; struct sockaddr_un unix_addr; apr_pool_clear(ptrans); len = sizeof(unix_addr); sd2 = accept(sd, (struct sockaddr *)&unix_addr, &len); if (sd2 < 0) { #if defined(ENETDOWN) if (errno == ENETDOWN) { /* The network has been shut down, no need to continue. Die gracefully */ ++daemon_should_exit; } #endif if (errno != EINTR) { ap_log_error(APLOG_MARK, APLOG_ERR, errno, (server_rec *)data, APLOGNO(01247) "Error accepting on cgid socket"); } continue; } r = apr_pcalloc(ptrans, sizeof(request_rec)); procnew = apr_pcalloc(ptrans, sizeof(*procnew)); r->pool = ptrans; stat = get_req(sd2, r, &argv0, &env, &cgid_req); if (stat != APR_SUCCESS) { ap_log_error(APLOG_MARK, APLOG_ERR, stat, main_server, APLOGNO(01248) "Error reading request on cgid socket"); close(sd2); continue; } if (cgid_req.ppid != parent_pid) { ap_log_error(APLOG_MARK, APLOG_CRIT, 0, main_server, APLOGNO(01249) "CGI request received from wrong server instance; " "see ScriptSock directive"); close(sd2); continue; } if (cgid_req.req_type == GETPID_REQ) { pid_t pid; apr_status_t rv; pid = (pid_t)((long)apr_hash_get(script_hash, &cgid_req.conn_id, sizeof(cgid_req.conn_id))); rv = sock_write(sd2, &pid, sizeof(pid)); if (rv != APR_SUCCESS) { ap_log_error(APLOG_MARK, APLOG_ERR, rv, main_server, APLOGNO(01250) "Error writing pid %" APR_PID_T_FMT " to handler", pid); } close(sd2); continue; } apr_os_file_put(&r->server->error_log, &errfileno, 0, r->pool); apr_os_file_put(&inout, &sd2, 0, r->pool); if (cgid_req.req_type == SSI_REQ) { in_pipe = APR_NO_PIPE; out_pipe = APR_FULL_BLOCK; err_pipe = APR_NO_PIPE; cmd_type = APR_SHELLCMD; } else { in_pipe = APR_CHILD_BLOCK; out_pipe = APR_CHILD_BLOCK; err_pipe = APR_CHILD_BLOCK; cmd_type = APR_PROGRAM; } if (((rc = apr_procattr_create(&procattr, ptrans)) != APR_SUCCESS) || ((cgid_req.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) || #ifdef AP_CGID_USE_RLIMIT #ifdef RLIMIT_CPU ( (cgid_req.limits.limit_cpu_set) && ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_CPU, &cgid_req.limits.limit_cpu)) != APR_SUCCESS)) || #endif #if defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS) ( (cgid_req.limits.limit_mem_set) && ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_MEM, &cgid_req.limits.limit_mem)) != APR_SUCCESS)) || #endif #ifdef RLIMIT_NPROC ( (cgid_req.limits.limit_nproc_set) && ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_NPROC, &cgid_req.limits.limit_nproc)) != APR_SUCCESS)) || #endif #endif ((rc = apr_procattr_child_errfn_set(procattr, cgid_child_errfn)) != APR_SUCCESS)) { /* Something bad happened, tell the world. * ap_log_rerror() won't work because the header table used by * ap_log_rerror() hasn't been replicated in the phony r */ ap_log_error(APLOG_MARK, APLOG_ERR, rc, r->server, APLOGNO(01251) "couldn't set child process attributes: %s", r->filename); procnew->pid = 0; /* no process to clean up */ close(sd2); } else { apr_pool_userdata_set(r, ERRFN_USERDATA_KEY, apr_pool_cleanup_null, ptrans); argv = (const char * const *)create_argv(r->pool, NULL, NULL, NULL, argv0, r->args); /* We want to close sd2 for the new CGI process too. * If it is left 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); if (memcmp(&empty_ugid, &cgid_req.ugid, sizeof(empty_ugid))) { /* We have a valid identity, and can be sure that * cgid_suexec_id_doer will return a valid ugid */ rc = ap_os_create_privileged_process(r, procnew, argv0, argv, (const char * const *)env, procattr, ptrans); } else { rc = apr_proc_create(procnew, argv0, argv, (const char * const *)env, procattr, ptrans); } if (rc != APR_SUCCESS) { /* Bad things happened. Everyone should have cleaned up. * ap_log_rerror() won't work because the header table used by * ap_log_rerror() hasn't been replicated in the phony r */ ap_log_error(APLOG_MARK, APLOG_ERR, rc, r->server, APLOGNO(01252) "couldn't create child process: %d: %s", rc, apr_filepath_name_get(r->filename)); procnew->pid = 0; /* no process to clean up */ } } /* If the script process was created, remember the pid for * later cleanup. If the script process wasn't created, clear * out any prior pid with the same key. * * We don't want to leak storage for the key, so only allocate * a key if the key doesn't exist yet in the hash; there are * only a limited number of possible keys (one for each * possible thread in the server), so we can allocate a copy * of the key the first time a thread has a cgid request. * Note that apr_hash_set() only uses the storage passed in * for the key if it is adding the key to the hash for the * first time; new key storage isn't needed for replacing the * existing value of a key. */ if (apr_hash_get(script_hash, &cgid_req.conn_id, sizeof(cgid_req.conn_id))) { key = &cgid_req.conn_id; } else { key = apr_pmemdup(pcgi, &cgid_req.conn_id, sizeof(cgid_req.conn_id)); } apr_hash_set(script_hash, key, sizeof(cgid_req.conn_id), (void *)((long)procnew->pid)); } return -1; /* should be <= 0 to distinguish from startup errors */ } static int cgid_start(apr_pool_t *p, server_rec *main_server, apr_proc_t *procnew) { daemon_should_exit = 0; /* clear setting from previous generation */ if ((daemon_pid = fork()) < 0) { ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, APLOGNO(01253) "mod_cgid: Couldn't spawn cgid daemon process"); return DECLINED; } else if (daemon_pid == 0) { if (pcgi == NULL) { apr_pool_create(&pcgi, p); } exit(cgid_server(main_server) > 0 ? DAEMON_STARTUP_ERROR : -1); } procnew->pid = daemon_pid; procnew->err = procnew->in = procnew->out = NULL; apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT); #if APR_HAS_OTHER_CHILD apr_proc_other_child_register(procnew, cgid_maint, procnew, NULL, p); #endif return OK; } static int cgid_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp) { sockname = ap_append_pid(pconf, DEFAULT_SOCKET, "."); return OK; } static int cgid_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *main_server) { apr_proc_t *procnew = NULL; const char *userdata_key = "cgid_init"; int ret = OK; void *data; root_server = main_server; root_pool = p; apr_pool_userdata_get(&data, userdata_key, main_server->process->pool); if (!data) { procnew = apr_pcalloc(main_server->process->pool, sizeof(*procnew)); procnew->pid = -1; procnew->err = procnew->in = procnew->out = NULL; apr_pool_userdata_set((const void *)procnew, userdata_key, apr_pool_cleanup_null, main_server->process->pool); return ret; } else { procnew = data; } if (ap_state_query(AP_SQ_MAIN_STATE) != AP_SQ_MS_CREATE_PRE_CONFIG) { char *tmp_sockname; parent_pid = getpid(); tmp_sockname = ap_runtime_dir_relative(p, sockname); if (strlen(tmp_sockname) > sizeof(server_addr->sun_path) - 1) { tmp_sockname[sizeof(server_addr->sun_path)] = '\0'; ap_log_error(APLOG_MARK, APLOG_ERR, 0, main_server, APLOGNO(01254) "The length of the ScriptSock path exceeds maximum, " "truncating to %s", tmp_sockname); } sockname = tmp_sockname; server_addr_len = APR_OFFSETOF(struct sockaddr_un, sun_path) + strlen(sockname); server_addr = (struct sockaddr_un *)apr_palloc(p, server_addr_len + 1); server_addr->sun_family = AF_UNIX; strcpy(server_addr->sun_path, sockname); ret = cgid_start(p, main_server, procnew); if (ret != OK ) { return ret; } 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); } } return ret; } 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; 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 void *create_cgid_dirconf(apr_pool_t *p, char *dummy) { cgid_dirconf *c = (cgid_dirconf *) apr_pcalloc(p, sizeof(cgid_dirconf)); return c; } 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 = ap_server_root_relative(cmd->pool, arg); if (!conf->logname) { return apr_pstrcat(cmd->pool, "Invalid ScriptLog path ", arg, NULL); } 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) { const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); if (err != NULL) { return err; } /* Make sure the pid is appended to the sockname */ sockname = ap_append_pid(cmd->pool, arg, "."); sockname = ap_runtime_dir_relative(cmd->pool, sockname); if (!sockname) { return apr_pstrcat(cmd->pool, "Invalid ScriptSock path", arg, NULL); } return NULL; } static const char *set_script_timeout(cmd_parms *cmd, void *dummy, const char *arg) { cgid_dirconf *dc = dummy; if (ap_timeout_parameter_parse(arg, &dc->timeout, "s") != APR_SUCCESS) { return "CGIDScriptTimeout has wrong format"; } 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."), AP_INIT_TAKE1("CGIDScriptTimeout", set_script_timeout, NULL, RSRC_CONF | ACCESS_CONF, "The amount of time to wait between successful reads from " "the CGI script, in seconds."), {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_ERR; /* Intentional no APLOGNO */ /* Callee provides APLOGNO in error text */ ap_log_rerror(APLOG_MARK, log_flags, rv, r, "%s: %s", error, r->filename); /* XXX Very expensive mainline case! Open, then getfileinfo! */ if (!conf->logname || ((stat(conf->logname, &finfo) == 0) && (finfo.st_size > conf->logbytes)) || (apr_file_open(&f, 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_bucket_brigade *bb, apr_file_t *script_err) { const apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in); const apr_table_entry_t *hdrs = (apr_table_entry_t *) hdrs_arr->elts; char argsbuffer[HUGE_STRING_LEN]; apr_file_t *f = NULL; apr_bucket *e; const char *buf; apr_size_t len; apr_status_t rv; int first; int i; struct stat finfo; char time_str[APR_CTIME_LEN]; /* XXX Very expensive mainline case! Open, then getfileinfo! */ if (!conf->logname || ((stat(conf->logname, &finfo) == 0) && (finfo.st_size > conf->logbytes)) || (apr_file_open(&f, conf->logname, APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT, r->pool) != APR_SUCCESS)) { /* Soak up script output */ discard_script_output(bb); if (script_err) { while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == APR_SUCCESS) 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 = (const 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); first = 1; for (e = APR_BRIGADE_FIRST(bb); e != APR_BRIGADE_SENTINEL(bb); e = APR_BUCKET_NEXT(e)) { if (APR_BUCKET_IS_EOS(e)) { break; } rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ); if (rv != APR_SUCCESS || (len == 0)) { break; } if (first) { apr_file_puts("%stdout\n", f); first = 0; } apr_file_write_full(f, buf, len, NULL); apr_file_puts("\n", f); } if (script_err) { if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == APR_SUCCESS) { apr_file_puts("%stderr\n", f); apr_file_puts(argsbuffer, f); while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_err) == APR_SUCCESS) apr_file_puts(argsbuffer, f); apr_file_puts("\n", f); } } if (script_err) { apr_file_close(script_err); } apr_file_close(f); return ret; } static int connect_to_daemon(int *sdptr, request_rec *r, cgid_server_conf *conf) { int sd; int connect_tries; int connect_errno; apr_interval_time_t sliding_timer; connect_tries = 0; sliding_timer = 100000; /* 100 milliseconds */ while (1) { connect_errno = 0; ++connect_tries; if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, errno, APLOGNO(01255) "unable to create socket to cgi daemon"); } if (connect(sd, (struct sockaddr *)server_addr, server_addr_len) < 0) { /* Save errno for later */ connect_errno = errno; /* ECONNREFUSED means the listen queue is full; ENOENT means that * the cgid server either hasn't started up yet, or we're pointing * at the wrong socket file */ if ((errno == ECONNREFUSED || errno == ENOENT) && connect_tries < DEFAULT_CONNECT_ATTEMPTS) { ap_log_rerror(APLOG_MARK, APLOG_DEBUG, errno, r, APLOGNO(01256) "connect #%d to cgi daemon failed, sleeping before retry", connect_tries); close(sd); apr_sleep(sliding_timer); if (sliding_timer < apr_time_from_sec(2)) { sliding_timer *= 2; } } else { close(sd); return log_scripterror(r, conf, HTTP_SERVICE_UNAVAILABLE, errno, APLOGNO(01257) "unable to connect to cgi daemon after multiple tries"); } } else { apr_pool_cleanup_register(r->pool, (void *)((long)sd), close_unix_socket, apr_pool_cleanup_null); break; /* we got connected! */ } /* If we didn't find the socket but the server was not recently restarted, * chances are there's something wrong with the cgid daemon */ if (connect_errno == ENOENT && apr_time_sec(apr_time_now() - ap_scoreboard_image->global->restart_time) > DEFAULT_CONNECT_STARTUP_DELAY) { return log_scripterror(r, conf, HTTP_SERVICE_UNAVAILABLE, connect_errno, apr_pstrcat(r->pool, APLOGNO(02833) "ScriptSock ", sockname, " does not exist", NULL)); } /* gotta try again, but make sure the cgid daemon is still around */ if (connect_errno != ENOENT && kill(daemon_pid, 0) != 0) { return log_scripterror(r, conf, HTTP_SERVICE_UNAVAILABLE, connect_errno, APLOGNO(01258) "cgid daemon is gone; is Apache terminating?"); } } *sdptr = sd; return OK; } static void discard_script_output(apr_bucket_brigade *bb) { apr_bucket *e; const char *buf; apr_size_t len; apr_status_t rv; for (e = APR_BRIGADE_FIRST(bb); e != APR_BRIGADE_SENTINEL(bb); e = APR_BUCKET_NEXT(e)) { if (APR_BUCKET_IS_EOS(e)) { break; } rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ); if (rv != APR_SUCCESS) { break; } } } /**************************************************************** * * Actual cgid handling... */ struct cleanup_script_info { request_rec *r; cgid_server_conf *conf; pid_t pid; }; static apr_status_t dead_yet(pid_t pid, apr_interval_time_t max_wait) { apr_interval_time_t interval = 10000; /* 10 ms */ apr_interval_time_t total = 0; do { #ifdef _AIX /* On AIX, for processes like mod_cgid's script children where * SIGCHLD is ignored, kill(pid,0) returns success for up to * one second after the script child exits, based on when a * daemon runs to clean up unnecessary process table entries. * getpgid() can report the proper info (-1/ESRCH) immediately. */ if (getpgid(pid) < 0) { #else if (kill(pid, 0) < 0) { #endif return APR_SUCCESS; } apr_sleep(interval); total = total + interval; if (interval < 500000) { interval *= 2; } } while (total < max_wait); return APR_EGENERAL; } static apr_status_t cleanup_nonchild_process(request_rec *r, pid_t pid) { kill(pid, SIGTERM); /* in case it isn't dead yet */ if (dead_yet(pid, apr_time_from_sec(3)) == APR_SUCCESS) { return APR_SUCCESS; } ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01259) "CGI process %" APR_PID_T_FMT " didn't exit, sending SIGKILL", pid); kill(pid, SIGKILL); if (dead_yet(pid, apr_time_from_sec(3)) == APR_SUCCESS) { return APR_SUCCESS; } ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01260) "CGI process %" APR_PID_T_FMT " didn't exit, sending SIGKILL again", pid); kill(pid, SIGKILL); return APR_EGENERAL; } static apr_status_t get_cgi_pid(request_rec *r, cgid_server_conf *conf, pid_t *pid) { cgid_req_t req = {0}; apr_status_t stat; int rc, sd; rc = connect_to_daemon(&sd, r, conf); if (rc != OK) { return APR_EGENERAL; } req.req_type = GETPID_REQ; req.ppid = parent_pid; req.conn_id = r->connection->id; stat = sock_write(sd, &req, sizeof(req)); if (stat != APR_SUCCESS) { return stat; } /* wait for pid of script */ stat = sock_read(sd, pid, sizeof(*pid)); if (stat != APR_SUCCESS) { return stat; } if (pid == 0) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01261) "daemon couldn't find CGI process for connection %lu", r->connection->id); return APR_EGENERAL; } return APR_SUCCESS; } static apr_status_t cleanup_script(void *vptr) { struct cleanup_script_info *info = vptr; return cleanup_nonchild_process(info->r, info->pid); } static int cgid_handler(request_rec *r) { int retval, nph, dbpos; char *argv0, *dbuf; apr_bucket_brigade *bb; apr_bucket *b; cgid_server_conf *conf; int is_included; int seen_eos, child_stopped_reading; int sd; char **env; apr_file_t *tempsock; struct cleanup_script_info *info; apr_status_t rv; cgid_dirconf *dc; if (strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script")) { return DECLINED; } conf = ap_get_module_config(r->server->module_config, &cgid_module); dc = ap_get_module_config(r->per_dir_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)); argv0 = r->filename; if (!(ap_allow_options(r) & OPT_EXECCGI) && !is_scriptaliased(r)) { return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(01262) "Options ExecCGI is off in this directory"); } if (nph && is_included) { return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(01263) "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 == APR_NOFILE) { return log_scripterror(r, conf, HTTP_NOT_FOUND, 0, APLOGNO(01264) "script not found or unable to stat"); } #endif if (r->finfo.filetype == APR_DIR) { return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(01265) "attempt to invoke directory as script"); } if ((r->used_path_info == AP_REQ_REJECT_PATH_INFO) && r->path_info && *r->path_info) { /* default to accept */ return log_scripterror(r, conf, HTTP_NOT_FOUND, 0, APLOGNO(01266) "AcceptPathInfo off disallows user's path"); } /* if (!ap_suexec_enabled) { if (!ap_can_exec(&r->finfo)) return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(01267) "file permissions deny server execution"); } */ /* * httpd core function used to add common environment variables like * DOCUMENT_ROOT. */ ap_add_common_vars(r); ap_add_cgi_vars(r); env = ap_create_environment(r->pool, r->subprocess_env); if ((retval = connect_to_daemon(&sd, r, conf)) != OK) { return retval; } rv = send_req(sd, r, argv0, env, CGI_REQ); if (rv != APR_SUCCESS) { ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01268) "write to cgi daemon process"); } info = apr_palloc(r->pool, sizeof(struct cleanup_script_info)); info->conf = conf; info->r = r; rv = get_cgi_pid(r, conf, &(info->pid)); if (APR_SUCCESS == rv){ apr_pool_cleanup_register(r->pool, info, cleanup_script, apr_pool_cleanup_null); } else { ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, "error determining cgi PID"); } /* We are putting the socket discriptor into an apr_file_t so that we can * use a pipe bucket to send the data to the client. APR will create * a cleanup for the apr_file_t which will close the socket, so we'll * get rid of the cleanup we registered when we created the socket. */ apr_os_pipe_put_ex(&tempsock, &sd, 1, r->pool); if (dc->timeout > 0) { apr_file_pipe_timeout_set(tempsock, dc->timeout); } else { apr_file_pipe_timeout_set(tempsock, r->server->timeout); } apr_pool_cleanup_kill(r->pool, (void *)((long)sd), close_unix_socket); /* Transfer any put/post args, CERN style... * Note that we already ignore SIGPIPE in the core server. */ bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); seen_eos = 0; child_stopped_reading = 0; dbuf = NULL; dbpos = 0; if (conf->logname) { dbuf = apr_palloc(r->pool, conf->bufbytes + 1); } do { apr_bucket *bucket; rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES, APR_BLOCK_READ, HUGE_STRING_LEN); if (rv != APR_SUCCESS) { ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01270) "Error reading request entity data"); return ap_map_http_request_error(rv, HTTP_BAD_REQUEST); } for (bucket = APR_BRIGADE_FIRST(bb); bucket != APR_BRIGADE_SENTINEL(bb); bucket = APR_BUCKET_NEXT(bucket)) { const char *data; apr_size_t len; if (APR_BUCKET_IS_EOS(bucket)) { seen_eos = 1; break; } /* We can't do much with this. */ if (APR_BUCKET_IS_FLUSH(bucket)) { continue; } /* If the child stopped, we still must read to EOS. */ if (child_stopped_reading) { continue; } /* read */ apr_bucket_read(bucket, &data, &len, APR_BLOCK_READ); if (conf->logname && dbpos < conf->bufbytes) { int cursize; if ((dbpos + len) > conf->bufbytes) { cursize = conf->bufbytes - dbpos; } else { cursize = len; } memcpy(dbuf + dbpos, data, cursize); dbpos += cursize; } /* Keep writing data to the child until done or too much time * elapses with no progress or an error occurs. */ rv = apr_file_write_full(tempsock, data, len, NULL); if (rv != APR_SUCCESS) { /* silly script stopped reading, soak up remaining message */ child_stopped_reading = 1; ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(02651) "Error writing request body to script %s", r->filename); } } apr_brigade_cleanup(bb); } while (!seen_eos); if (conf->logname) { dbuf[dbpos] = '\0'; } /* 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) { conn_rec *c = r->connection; const char *location; char sbuf[MAX_STRING_LEN]; int ret; bb = apr_brigade_create(r->pool, c->bucket_alloc); b = apr_bucket_pipe_create(tempsock, c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); b = apr_bucket_eos_create(c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); if ((ret = ap_scan_script_header_err_brigade_ex(r, bb, sbuf, APLOG_MODULE_INDEX))) { ret = log_script(r, conf, ret, dbuf, sbuf, bb, NULL); /* * ret could be HTTP_NOT_MODIFIED in the case that the CGI script * does not set an explicit status and ap_meets_conditions, which * is called by ap_scan_script_header_err_brigade, detects that * the conditions of the requests are met and the response is * not modified. * In this case set r->status and return OK in order to prevent * running through the error processing stack as this would * break with mod_cache, if the conditions had been set by * mod_cache itself to validate a stale entity. * BTW: We circumvent the error processing stack anyway if the * CGI script set an explicit status code (whatever it is) and * the only possible values for ret here are: * * HTTP_NOT_MODIFIED (set by ap_meets_conditions) * HTTP_PRECONDITION_FAILED (set by ap_meets_conditions) * HTTP_INTERNAL_SERVER_ERROR (if something went wrong during the * processing of the response of the CGI script, e.g broken headers * or a crashed CGI process). */ if (ret == HTTP_NOT_MODIFIED) { r->status = ret; return OK; } return ret; } location = apr_table_get(r->headers_out, "Location"); if (location && location[0] == '/' && r->status == 200) { /* Soak up all the script output */ discard_script_output(bb); apr_brigade_destroy(bb); /* This redirect needs to be a GET no matter what the original * method was. */ r->method = "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) { /* XXX: Note that if a script wants to produce its own Redirect * body, it now has to explicitly *say* "Status: 302" */ discard_script_output(bb); apr_brigade_destroy(bb); return HTTP_MOVED_TEMPORARILY; } rv = ap_pass_brigade(r->output_filters, bb); if (rv != APR_SUCCESS) { ap_log_rerror(APLOG_MARK, APLOG_TRACE1, rv, r, "Failed to flush CGI output to client"); } } if (nph) { conn_rec *c = r->connection; struct ap_filter_t *cur; /* get rid of all filters up through protocol... since we * haven't parsed off the headers, there is no way they can * work */ cur = r->proto_output_filters; while (cur && cur->frec->ftype < AP_FTYPE_CONNECTION) { cur = cur->next; } r->output_filters = r->proto_output_filters = cur; bb = apr_brigade_create(r->pool, c->bucket_alloc); b = apr_bucket_pipe_create(tempsock, c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); b = apr_bucket_eos_create(c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(bb, b); ap_pass_brigade(r->output_filters, bb); } 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 apr_status_t include_cgi(include_ctx_t *ctx, ap_filter_t *f, apr_bucket_brigade *bb, char *s) { request_rec *r = f->r; request_rec *rr = ap_sub_req_lookup_uri(s, r, f->next); int rr_status; if (rr->status != HTTP_OK) { ap_destroy_sub_req(rr); return APR_EGENERAL; } /* No hardwired path info or query allowed */ if ((rr->path_info && rr->path_info[0]) || rr->args) { ap_destroy_sub_req(rr); return APR_EGENERAL; } if (rr->finfo.filetype != APR_REG) { ap_destroy_sub_req(rr); return APR_EGENERAL; } /* 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. */ ap_set_content_type(rr, CGI_MAGIC_TYPE); /* Run it. */ rr_status = ap_run_sub_req(rr); if (ap_is_HTTP_REDIRECT(rr_status)) { const char *location = apr_table_get(rr->headers_out, "Location"); if (location) { char *buffer; location = ap_escape_html(rr->pool, location); buffer = apr_pstrcat(ctx->pool, "", location, "", NULL); APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pool_create(buffer, strlen(buffer), ctx->pool, f->c->bucket_alloc)); } } ap_destroy_sub_req(rr); return APR_SUCCESS; } /* This is the special environment used for running the "exec cmd=" * variety of SSI directives. */ static void add_ssi_vars(request_rec *r) { 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, NULL); 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, ap_filter_t *f, apr_bucket_brigade *bb, char *command) { char **env; int sd; int retval; apr_file_t *tempsock = NULL; request_rec *r = f->r; cgid_server_conf *conf = ap_get_module_config(r->server->module_config, &cgid_module); cgid_dirconf *dc = ap_get_module_config(r->per_dir_config, &cgid_module); struct cleanup_script_info *info; apr_status_t rv; add_ssi_vars(r); env = ap_create_environment(r->pool, r->subprocess_env); if ((retval = connect_to_daemon(&sd, r, conf)) != OK) { return retval; } send_req(sd, r, command, env, SSI_REQ); info = apr_palloc(r->pool, sizeof(struct cleanup_script_info)); info->conf = conf; info->r = r; rv = get_cgi_pid(r, conf, &(info->pid)); if (APR_SUCCESS == rv) { /* for this type of request, the script is invoked through an * intermediate shell process... cleanup_script is only able * to knock out the shell process, not the actual script */ apr_pool_cleanup_register(r->pool, info, cleanup_script, apr_pool_cleanup_null); } else { ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, "error determining cgi PID (for SSI)"); } apr_pool_cleanup_register(r->pool, info, cleanup_script, apr_pool_cleanup_null); /* We are putting the socket discriptor into an apr_file_t so that we can * use a pipe bucket to send the data to the client. APR will create * a cleanup for the apr_file_t which will close the socket, so we'll * get rid of the cleanup we registered when we created the socket. */ apr_os_pipe_put_ex(&tempsock, &sd, 1, r->pool); if (dc->timeout > 0) { apr_file_pipe_timeout_set(tempsock, dc->timeout); } else { apr_file_pipe_timeout_set(tempsock, r->server->timeout); } apr_pool_cleanup_kill(r->pool, (void *)((long)sd), close_unix_socket); APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pipe_create(tempsock, f->c->bucket_alloc)); ctx->flush_now = 1; return APR_SUCCESS; } static apr_status_t handle_exec(include_ctx_t *ctx, ap_filter_t *f, apr_bucket_brigade *bb) { char *tag = NULL; char *tag_val = NULL; request_rec *r = f->r; char *file = r->filename; char parsed_string[MAX_STRING_LEN]; if (!ctx->argc) { ap_log_rerror(APLOG_MARK, (ctx->flags & SSI_FLAG_PRINTING) ? APLOG_ERR : APLOG_WARNING, 0, r, APLOGNO(03196) "missing argument for exec element in %s", r->filename); } if (!(ctx->flags & SSI_FLAG_PRINTING)) { return APR_SUCCESS; } if (!ctx->argc) { SSI_CREATE_ERROR_BUCKET(ctx, f, bb); return APR_SUCCESS; } if (ctx->flags & SSI_FLAG_NO_EXEC) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01271) "exec used but not allowed " "in %s", r->filename); SSI_CREATE_ERROR_BUCKET(ctx, f, bb); return APR_SUCCESS; } while (1) { cgid_pfn_gtv(ctx, &tag, &tag_val, SSI_VALUE_DECODED); if (!tag || !tag_val) { break; } if (!strcmp(tag, "cmd")) { apr_status_t rv; cgid_pfn_ps(ctx, tag_val, parsed_string, sizeof(parsed_string), SSI_EXPAND_LEAVE_NAME); rv = include_cmd(ctx, f, bb, parsed_string); if (rv != APR_SUCCESS) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01272) "execution failure for parameter \"%s\" " "to tag exec in file %s", tag, r->filename); SSI_CREATE_ERROR_BUCKET(ctx, f, bb); break; } } else if (!strcmp(tag, "cgi")) { apr_status_t rv; cgid_pfn_ps(ctx, tag_val, parsed_string, sizeof(parsed_string), SSI_EXPAND_DROP_NAME); rv = include_cgi(ctx, f, bb, parsed_string); if (rv != APR_SUCCESS) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01273) "invalid CGI ref " "\"%s\" in %s", tag_val, file); SSI_CREATE_ERROR_BUCKET(ctx, f, bb); break; } } else { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01274) "unknown parameter " "\"%s\" to tag exec in %s", tag, file); SSI_CREATE_ERROR_BUCKET(ctx, f, bb); break; } } return APR_SUCCESS; } /*============================================================================ *============================================================================ * 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_pre_config(cgid_pre_config, NULL, NULL, APR_HOOK_MIDDLE); ap_hook_post_config(cgid_init, aszPre, NULL, APR_HOOK_MIDDLE); ap_hook_handler(cgid_handler, NULL, NULL, APR_HOOK_MIDDLE); } AP_DECLARE_MODULE(cgid) = { STANDARD20_MODULE_STUFF, create_cgid_dirconf, /* 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 */ };