| /* 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.h" |
| #include "apr_strings.h" |
| #include "apr_thread_proc.h" /* for RLIMIT stuff */ |
| #include "apr_optional.h" |
| #include "apr_buckets.h" |
| #include "apr_lib.h" |
| #include "apr_poll.h" |
| |
| #define APR_WANT_STRFUNC |
| #define APR_WANT_MEMFUNC |
| #include "apr_want.h" |
| |
| #include "util_filter.h" |
| #include "ap_config.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 "mod_core.h" |
| #include "mod_cgi.h" |
| |
| #if APR_HAVE_STRUCT_RLIMIT |
| #if defined (RLIMIT_CPU) || defined (RLIMIT_NPROC) || defined (RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS) |
| #define AP_CGI_USE_RLIMIT |
| #endif |
| #endif |
| |
| module AP_MODULE_DECLARE_DATA cgi_module; |
| |
| static APR_OPTIONAL_FN_TYPE(ap_register_include_handler) *cgi_pfn_reg_with_ssi; |
| static APR_OPTIONAL_FN_TYPE(ap_ssi_get_tag_and_value) *cgi_pfn_gtv; |
| static APR_OPTIONAL_FN_TYPE(ap_ssi_parse_string) *cgi_pfn_ps; |
| static APR_OPTIONAL_FN_TYPE(ap_cgi_build_command) *cgi_build_command; |
| |
| /* Read and discard the data in the brigade produced by a CGI script */ |
| static void discard_script_output(apr_bucket_brigade *bb); |
| |
| /* 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 |
| |
| typedef struct { |
| const char *logname; |
| long logbytes; |
| apr_size_t bufbytes; |
| } cgi_server_conf; |
| |
| static void *create_cgi_config(apr_pool_t *p, server_rec *s) |
| { |
| cgi_server_conf *c = |
| (cgi_server_conf *) apr_pcalloc(p, sizeof(cgi_server_conf)); |
| |
| c->logname = NULL; |
| c->logbytes = DEFAULT_LOGBYTES; |
| c->bufbytes = DEFAULT_BUFBYTES; |
| |
| return c; |
| } |
| |
| static void *merge_cgi_config(apr_pool_t *p, void *basev, void *overridesv) |
| { |
| cgi_server_conf *base = (cgi_server_conf *) basev, |
| *overrides = (cgi_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; |
| cgi_server_conf *conf = ap_get_module_config(s->module_config, |
| &cgi_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; |
| cgi_server_conf *conf = ap_get_module_config(s->module_config, |
| &cgi_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; |
| cgi_server_conf *conf = ap_get_module_config(s->module_config, |
| &cgi_module); |
| |
| conf->bufbytes = atoi(arg); |
| return NULL; |
| } |
| |
| static const command_rec cgi_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"), |
| {NULL} |
| }; |
| |
| static int log_scripterror(request_rec *r, cgi_server_conf * conf, int ret, |
| apr_status_t rv, char *logno, char *error) |
| { |
| apr_file_t *f = NULL; |
| apr_finfo_t 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: %s", logno ? logno : "", error, r->filename); |
| |
| /* XXX Very expensive mainline case! Open, then getfileinfo! */ |
| if (!conf->logname || |
| ((apr_stat(&finfo, conf->logname, |
| APR_FINFO_SIZE, r->pool) == APR_SUCCESS) && |
| (finfo.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 /cgi-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/cgi-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; |
| } |
| |
| /* Soak up stderr from a script and redirect it to the error log. |
| */ |
| static apr_status_t log_script_err(request_rec *r, apr_file_t *script_err) |
| { |
| char argsbuffer[HUGE_STRING_LEN]; |
| char *newline; |
| apr_status_t rv; |
| cgi_server_conf *conf = ap_get_module_config(r->server->module_config, &cgi_module); |
| |
| while ((rv = apr_file_gets(argsbuffer, HUGE_STRING_LEN, |
| script_err)) == APR_SUCCESS) { |
| newline = strchr(argsbuffer, '\n'); |
| if (newline) { |
| *newline = '\0'; |
| } |
| log_scripterror(r, conf, r->status, 0, APLOGNO(01215), argsbuffer); |
| } |
| |
| return rv; |
| } |
| |
| static int log_script(request_rec *r, cgi_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 = (const 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; |
| apr_finfo_t finfo; |
| char time_str[APR_CTIME_LEN]; |
| |
| /* XXX Very expensive mainline case! Open, then getfileinfo! */ |
| if (!conf->logname || |
| ((apr_stat(&finfo, conf->logname, |
| APR_FINFO_SIZE, r->pool) == APR_SUCCESS) && |
| (finfo.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); |
| log_script_err(r, script_err); |
| return ret; |
| } |
| |
| /* "%% [Wed Jun 19 10:53:21 1996] GET /cgi-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/cgi-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(f, buf, &len); |
| apr_file_puts("\n", f); |
| } |
| |
| 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); |
| } |
| |
| apr_brigade_destroy(bb); |
| apr_file_close(script_err); |
| |
| apr_file_close(f); |
| return ret; |
| } |
| |
| |
| /* 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 void cgi_child_errfn(apr_pool_t *pool, apr_status_t err, |
| const char *description) |
| { |
| apr_file_t *stderr_log; |
| |
| apr_file_open_stderr(&stderr_log, pool); |
| /* Escape the logged string because it may be something that |
| * came in over the network. |
| */ |
| apr_file_printf(stderr_log, |
| "(%d)%pm: %s\n", |
| err, |
| &err, |
| #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED |
| ap_escape_logitem(pool, |
| #endif |
| description |
| #ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED |
| ) |
| #endif |
| ); |
| } |
| |
| static apr_status_t run_cgi_child(apr_file_t **script_out, |
| apr_file_t **script_in, |
| apr_file_t **script_err, |
| const char *command, |
| const char * const argv[], |
| request_rec *r, |
| apr_pool_t *p, |
| cgi_exec_info_t *e_info) |
| { |
| const char * const *env; |
| apr_procattr_t *procattr; |
| apr_proc_t *procnew; |
| apr_status_t rc = APR_SUCCESS; |
| |
| #ifdef AP_CGI_USE_RLIMIT |
| core_dir_config *conf = ap_get_core_module_config(r->per_dir_config); |
| #endif |
| |
| #ifdef DEBUG_CGI |
| #ifdef OS2 |
| /* Under OS/2 need to use device con. */ |
| FILE *dbg = fopen("con", "w"); |
| #else |
| FILE *dbg = fopen("/dev/tty", "w"); |
| #endif |
| int i; |
| #endif |
| |
| RAISE_SIGSTOP(CGI_CHILD); |
| #ifdef DEBUG_CGI |
| fprintf(dbg, "Attempting to exec %s as CGI child (argv0 = %s)\n", |
| r->filename, argv[0]); |
| #endif |
| |
| env = (const char * const *)ap_create_environment(p, r->subprocess_env); |
| |
| #ifdef DEBUG_CGI |
| fprintf(dbg, "Environment: \n"); |
| for (i = 0; env[i]; ++i) |
| fprintf(dbg, "'%s'\n", env[i]); |
| fclose(dbg); |
| #endif |
| |
| /* Transmute ourselves into the script. |
| * NB only ISINDEX scripts get decoded arguments. |
| */ |
| if (((rc = apr_procattr_create(&procattr, p)) != APR_SUCCESS) || |
| ((rc = apr_procattr_io_set(procattr, |
| e_info->in_pipe, |
| e_info->out_pipe, |
| e_info->err_pipe)) != APR_SUCCESS) || |
| ((rc = apr_procattr_dir_set(procattr, |
| ap_make_dirstr_parent(r->pool, |
| r->filename))) != APR_SUCCESS) || |
| #if defined(RLIMIT_CPU) && defined(AP_CGI_USE_RLIMIT) |
| ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_CPU, |
| conf->limit_cpu)) != APR_SUCCESS) || |
| #endif |
| #if defined(AP_CGI_USE_RLIMIT) && (defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)) |
| ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_MEM, |
| conf->limit_mem)) != APR_SUCCESS) || |
| #endif |
| #if defined(RLIMIT_NPROC) && defined(AP_CGI_USE_RLIMIT) |
| ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_NPROC, |
| conf->limit_nproc)) != APR_SUCCESS) || |
| #endif |
| ((rc = apr_procattr_cmdtype_set(procattr, |
| e_info->cmd_type)) != APR_SUCCESS) || |
| |
| ((rc = apr_procattr_detach_set(procattr, |
| e_info->detached)) != APR_SUCCESS) || |
| ((rc = apr_procattr_addrspace_set(procattr, |
| e_info->addrspace)) != APR_SUCCESS) || |
| ((rc = apr_procattr_child_errfn_set(procattr, cgi_child_errfn)) != APR_SUCCESS)) { |
| /* Something bad happened, tell the world. */ |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, APLOGNO(01216) |
| "couldn't set child process attributes: %s", r->filename); |
| } |
| else { |
| procnew = apr_pcalloc(p, sizeof(*procnew)); |
| rc = ap_os_create_privileged_process(r, procnew, command, argv, env, |
| procattr, p); |
| |
| if (rc != APR_SUCCESS) { |
| /* Bad things happened. Everyone should have cleaned up. */ |
| /* Intentional no APLOGNO */ |
| ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, rc, r, |
| "couldn't create child process: %d: %s", rc, |
| apr_filepath_name_get(r->filename)); |
| } |
| else { |
| apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT); |
| |
| *script_in = procnew->out; |
| if (!*script_in) |
| return APR_EBADF; |
| apr_file_pipe_timeout_set(*script_in, r->server->timeout); |
| |
| if (e_info->prog_type == RUN_AS_CGI) { |
| *script_out = procnew->in; |
| if (!*script_out) |
| return APR_EBADF; |
| apr_file_pipe_timeout_set(*script_out, r->server->timeout); |
| |
| *script_err = procnew->err; |
| if (!*script_err) |
| return APR_EBADF; |
| apr_file_pipe_timeout_set(*script_err, r->server->timeout); |
| } |
| } |
| } |
| return (rc); |
| } |
| |
| |
| static apr_status_t default_build_command(const char **cmd, const char ***argv, |
| request_rec *r, apr_pool_t *p, |
| cgi_exec_info_t *e_info) |
| { |
| int numwords, x, idx; |
| char *w; |
| const char *args = NULL; |
| |
| if (e_info->process_cgi) { |
| *cmd = r->filename; |
| /* Do not process r->args if they contain an '=' assignment |
| */ |
| if (r->args && r->args[0] && !ap_strchr_c(r->args, '=')) { |
| args = r->args; |
| } |
| } |
| |
| if (!args) { |
| numwords = 1; |
| } |
| else { |
| /* count the number of keywords */ |
| for (x = 0, numwords = 2; args[x]; x++) { |
| if (args[x] == '+') { |
| ++numwords; |
| } |
| } |
| } |
| /* Everything is - 1 to account for the first parameter |
| * which is the program name. |
| */ |
| if (numwords > APACHE_ARG_MAX - 1) { |
| numwords = APACHE_ARG_MAX - 1; /* Truncate args to prevent overrun */ |
| } |
| *argv = apr_palloc(p, (numwords + 2) * sizeof(char *)); |
| (*argv)[0] = *cmd; |
| for (x = 1, idx = 1; x < numwords; x++) { |
| w = ap_getword_nulls(p, &args, '+'); |
| ap_unescape_url(w); |
| (*argv)[idx++] = ap_escape_shell_cmd(p, w); |
| } |
| (*argv)[idx] = NULL; |
| |
| return APR_SUCCESS; |
| } |
| |
| static void discard_script_output(apr_bucket_brigade *bb) |
| { |
| apr_bucket *e; |
| const char *buf; |
| apr_size_t len; |
| |
| for (e = APR_BRIGADE_FIRST(bb); |
| e != APR_BRIGADE_SENTINEL(bb) && !APR_BUCKET_IS_EOS(e); |
| e = APR_BRIGADE_FIRST(bb)) |
| { |
| if (apr_bucket_read(e, &buf, &len, APR_BLOCK_READ)) { |
| break; |
| } |
| apr_bucket_delete(e); |
| } |
| } |
| |
| #if APR_FILES_AS_SOCKETS |
| |
| /* A CGI bucket type is needed to catch any output to stderr from the |
| * script; see PR 22030. */ |
| static const apr_bucket_type_t bucket_type_cgi; |
| |
| struct cgi_bucket_data { |
| apr_pollset_t *pollset; |
| request_rec *r; |
| }; |
| |
| /* Create a CGI bucket using pipes from script stdout 'out' |
| * and stderr 'err', for request 'r'. */ |
| static apr_bucket *cgi_bucket_create(request_rec *r, |
| apr_file_t *out, apr_file_t *err, |
| apr_bucket_alloc_t *list) |
| { |
| apr_bucket *b = apr_bucket_alloc(sizeof(*b), list); |
| apr_status_t rv; |
| apr_pollfd_t fd; |
| struct cgi_bucket_data *data = apr_palloc(r->pool, sizeof *data); |
| |
| APR_BUCKET_INIT(b); |
| b->free = apr_bucket_free; |
| b->list = list; |
| b->type = &bucket_type_cgi; |
| b->length = (apr_size_t)(-1); |
| b->start = -1; |
| |
| /* Create the pollset */ |
| rv = apr_pollset_create(&data->pollset, 2, r->pool, 0); |
| if (rv != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01217) |
| "apr_pollset_create(); check system or user limits"); |
| return NULL; |
| } |
| |
| fd.desc_type = APR_POLL_FILE; |
| fd.reqevents = APR_POLLIN; |
| fd.p = r->pool; |
| fd.desc.f = out; /* script's stdout */ |
| fd.client_data = (void *)1; |
| rv = apr_pollset_add(data->pollset, &fd); |
| if (rv != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01218) |
| "apr_pollset_add(); check system or user limits"); |
| return NULL; |
| } |
| |
| fd.desc.f = err; /* script's stderr */ |
| fd.client_data = (void *)2; |
| rv = apr_pollset_add(data->pollset, &fd); |
| if (rv != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01219) |
| "apr_pollset_add(); check system or user limits"); |
| return NULL; |
| } |
| |
| data->r = r; |
| b->data = data; |
| return b; |
| } |
| |
| /* Create a duplicate CGI bucket using given bucket data */ |
| static apr_bucket *cgi_bucket_dup(struct cgi_bucket_data *data, |
| apr_bucket_alloc_t *list) |
| { |
| apr_bucket *b = apr_bucket_alloc(sizeof(*b), list); |
| APR_BUCKET_INIT(b); |
| b->free = apr_bucket_free; |
| b->list = list; |
| b->type = &bucket_type_cgi; |
| b->length = (apr_size_t)(-1); |
| b->start = -1; |
| b->data = data; |
| return b; |
| } |
| |
| /* Handle stdout from CGI child. Duplicate of logic from the _read |
| * method of the real APR pipe bucket implementation. */ |
| static apr_status_t cgi_read_stdout(apr_bucket *a, apr_file_t *out, |
| const char **str, apr_size_t *len) |
| { |
| char *buf; |
| apr_status_t rv; |
| |
| *str = NULL; |
| *len = APR_BUCKET_BUFF_SIZE; |
| buf = apr_bucket_alloc(*len, a->list); /* XXX: check for failure? */ |
| |
| rv = apr_file_read(out, buf, len); |
| |
| if (rv != APR_SUCCESS && rv != APR_EOF) { |
| apr_bucket_free(buf); |
| return rv; |
| } |
| |
| if (*len > 0) { |
| struct cgi_bucket_data *data = a->data; |
| apr_bucket_heap *h; |
| |
| /* Change the current bucket to refer to what we read */ |
| a = apr_bucket_heap_make(a, buf, *len, apr_bucket_free); |
| h = a->data; |
| h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */ |
| *str = buf; |
| APR_BUCKET_INSERT_AFTER(a, cgi_bucket_dup(data, a->list)); |
| } |
| else { |
| apr_bucket_free(buf); |
| a = apr_bucket_immortal_make(a, "", 0); |
| *str = a->data; |
| } |
| return rv; |
| } |
| |
| /* Read method of CGI bucket: polls on stderr and stdout of the child, |
| * sending any stderr output immediately away to the error log. */ |
| static apr_status_t cgi_bucket_read(apr_bucket *b, const char **str, |
| apr_size_t *len, apr_read_type_e block) |
| { |
| struct cgi_bucket_data *data = b->data; |
| apr_interval_time_t timeout; |
| apr_status_t rv; |
| int gotdata = 0; |
| |
| timeout = block == APR_NONBLOCK_READ ? 0 : data->r->server->timeout; |
| |
| do { |
| const apr_pollfd_t *results; |
| apr_int32_t num; |
| |
| rv = apr_pollset_poll(data->pollset, timeout, &num, &results); |
| if (APR_STATUS_IS_TIMEUP(rv)) { |
| if (timeout) { |
| ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, data->r, APLOGNO(01220) |
| "Timeout waiting for output from CGI script %s", |
| data->r->filename); |
| return rv; |
| } |
| else { |
| return APR_EAGAIN; |
| } |
| } |
| else if (APR_STATUS_IS_EINTR(rv)) { |
| continue; |
| } |
| else if (rv != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, data->r, APLOGNO(01221) |
| "poll failed waiting for CGI child"); |
| return rv; |
| } |
| |
| for (; num; num--, results++) { |
| if (results[0].client_data == (void *)1) { |
| /* stdout */ |
| rv = cgi_read_stdout(b, results[0].desc.f, str, len); |
| if (APR_STATUS_IS_EOF(rv)) { |
| rv = APR_SUCCESS; |
| } |
| gotdata = 1; |
| } else { |
| /* stderr */ |
| apr_status_t rv2 = log_script_err(data->r, results[0].desc.f); |
| if (APR_STATUS_IS_EOF(rv2)) { |
| apr_pollset_remove(data->pollset, &results[0]); |
| } |
| } |
| } |
| |
| } while (!gotdata); |
| |
| return rv; |
| } |
| |
| static const apr_bucket_type_t bucket_type_cgi = { |
| "CGI", 5, APR_BUCKET_DATA, |
| apr_bucket_destroy_noop, |
| cgi_bucket_read, |
| apr_bucket_setaside_notimpl, |
| apr_bucket_split_notimpl, |
| apr_bucket_copy_notimpl |
| }; |
| |
| #endif |
| |
| static int cgi_handler(request_rec *r) |
| { |
| int nph; |
| apr_size_t dbpos = 0; |
| const char *argv0; |
| const char *command; |
| const char **argv; |
| char *dbuf = NULL; |
| apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL; |
| apr_bucket_brigade *bb; |
| apr_bucket *b; |
| int is_included; |
| int seen_eos, child_stopped_reading; |
| apr_pool_t *p; |
| cgi_server_conf *conf; |
| apr_status_t rv; |
| cgi_exec_info_t e_info; |
| conn_rec *c; |
| |
| if (strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script")) { |
| return DECLINED; |
| } |
| |
| c = r->connection; |
| |
| is_included = !strcmp(r->protocol, "INCLUDED"); |
| |
| p = r->main ? r->main->pool : r->pool; |
| |
| argv0 = apr_filepath_name_get(r->filename); |
| nph = !(strncmp(argv0, "nph-", 4)); |
| conf = ap_get_module_config(r->server->module_config, &cgi_module); |
| |
| if (!(ap_allow_options(r) & OPT_EXECCGI) && !is_scriptaliased(r)) |
| return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(02809), |
| "Options ExecCGI is off in this directory"); |
| if (nph && is_included) |
| return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(02810), |
| "attempt to include NPH CGI script"); |
| |
| if (r->finfo.filetype == APR_NOFILE) |
| return log_scripterror(r, conf, HTTP_NOT_FOUND, 0, APLOGNO(02811), |
| "script not found or unable to stat"); |
| if (r->finfo.filetype == APR_DIR) |
| return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, APLOGNO(02812), |
| "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(02813), |
| "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(03194) |
| "file permissions deny server execution"); |
| } |
| |
| */ |
| ap_add_common_vars(r); |
| ap_add_cgi_vars(r); |
| |
| e_info.process_cgi = 1; |
| e_info.cmd_type = APR_PROGRAM; |
| e_info.detached = 0; |
| e_info.in_pipe = APR_CHILD_BLOCK; |
| e_info.out_pipe = APR_CHILD_BLOCK; |
| e_info.err_pipe = APR_CHILD_BLOCK; |
| e_info.prog_type = RUN_AS_CGI; |
| e_info.bb = NULL; |
| e_info.ctx = NULL; |
| e_info.next = NULL; |
| e_info.addrspace = 0; |
| |
| /* build the command line */ |
| if ((rv = cgi_build_command(&command, &argv, r, p, &e_info)) != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01222) |
| "don't know how to spawn child process: %s", |
| r->filename); |
| return HTTP_INTERNAL_SERVER_ERROR; |
| } |
| |
| /* run the script in its own process */ |
| if ((rv = run_cgi_child(&script_out, &script_in, &script_err, |
| command, argv, r, p, &e_info)) != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01223) |
| "couldn't spawn child process: %s", r->filename); |
| return HTTP_INTERNAL_SERVER_ERROR; |
| } |
| |
| /* Transfer any put/post args, CERN style... |
| * Note that we already ignore SIGPIPE in the core server. |
| */ |
| bb = apr_brigade_create(r->pool, c->bucket_alloc); |
| seen_eos = 0; |
| child_stopped_reading = 0; |
| if (conf->logname) { |
| dbuf = apr_palloc(r->pool, conf->bufbytes + 1); |
| dbpos = 0; |
| } |
| 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(01225) |
| "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(script_out, data, len, NULL); |
| |
| if (rv != APR_SUCCESS) { |
| /* silly script stopped reading, soak up remaining message */ |
| child_stopped_reading = 1; |
| } |
| } |
| apr_brigade_cleanup(bb); |
| } |
| while (!seen_eos); |
| |
| if (conf->logname) { |
| dbuf[dbpos] = '\0'; |
| } |
| /* Is this flush really needed? */ |
| apr_file_flush(script_out); |
| apr_file_close(script_out); |
| |
| AP_DEBUG_ASSERT(script_in != NULL); |
| |
| #if APR_FILES_AS_SOCKETS |
| apr_file_pipe_timeout_set(script_in, 0); |
| apr_file_pipe_timeout_set(script_err, 0); |
| |
| b = cgi_bucket_create(r, script_in, script_err, c->bucket_alloc); |
| if (b == NULL) |
| return HTTP_INTERNAL_SERVER_ERROR; |
| #else |
| b = apr_bucket_pipe_create(script_in, c->bucket_alloc); |
| #endif |
| APR_BRIGADE_INSERT_TAIL(bb, b); |
| b = apr_bucket_eos_create(c->bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(bb, b); |
| |
| /* Handle script return... */ |
| if (!nph) { |
| const char *location; |
| char sbuf[MAX_STRING_LEN]; |
| int ret; |
| |
| if ((ret = ap_scan_script_header_err_brigade_ex(r, bb, sbuf, |
| APLOG_MODULE_INDEX))) |
| { |
| ret = log_script(r, conf, ret, dbuf, sbuf, bb, script_err); |
| |
| /* |
| * 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 && r->status == 200) { |
| /* For a redirect whether internal or not, discard any |
| * remaining stdout from the script, and log any remaining |
| * stderr output, as normal. */ |
| discard_script_output(bb); |
| apr_brigade_destroy(bb); |
| apr_file_pipe_timeout_set(script_err, r->server->timeout); |
| log_script_err(r, script_err); |
| } |
| |
| if (location && location[0] == '/' && r->status == 200) { |
| /* 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" |
| */ |
| return HTTP_MOVED_TEMPORARILY; |
| } |
| |
| rv = ap_pass_brigade(r->output_filters, bb); |
| } |
| else /* nph */ { |
| 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; |
| |
| rv = ap_pass_brigade(r->output_filters, bb); |
| } |
| |
| /* don't soak up script output if errors occurred writing it |
| * out... otherwise, we prolong the life of the script when the |
| * connection drops or we stopped sending output for some other |
| * reason */ |
| if (rv == APR_SUCCESS && !r->connection->aborted) { |
| apr_file_pipe_timeout_set(script_err, r->server->timeout); |
| log_script_err(r, script_err); |
| } |
| |
| apr_file_close(script_err); |
| |
| 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, "<a href=\"", location, "\">", |
| location, "</a>", 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; |
| } |
| |
| static apr_status_t include_cmd(include_ctx_t *ctx, ap_filter_t *f, |
| apr_bucket_brigade *bb, const char *command) |
| { |
| cgi_exec_info_t e_info; |
| const char **argv; |
| apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL; |
| apr_status_t rv; |
| request_rec *r = f->r; |
| |
| add_ssi_vars(r); |
| |
| e_info.process_cgi = 0; |
| e_info.cmd_type = APR_SHELLCMD; |
| e_info.detached = 0; |
| e_info.in_pipe = APR_NO_PIPE; |
| e_info.out_pipe = APR_FULL_BLOCK; |
| e_info.err_pipe = APR_NO_PIPE; |
| e_info.prog_type = RUN_AS_SSI; |
| e_info.bb = &bb; |
| e_info.ctx = ctx; |
| e_info.next = f->next; |
| e_info.addrspace = 0; |
| |
| if ((rv = cgi_build_command(&command, &argv, r, r->pool, |
| &e_info)) != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01226) |
| "don't know how to spawn cmd child process: %s", |
| r->filename); |
| return rv; |
| } |
| |
| /* run the script in its own process */ |
| if ((rv = run_cgi_child(&script_out, &script_in, &script_err, |
| command, argv, r, r->pool, |
| &e_info)) != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01227) |
| "couldn't spawn child process: %s", r->filename); |
| return rv; |
| } |
| |
| APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pipe_create(script_in, |
| f->c->bucket_alloc)); |
| ctx->flush_now = 1; |
| |
| /* We can't close the pipe here, because we may return before the |
| * full CGI has been sent to the network. That's okay though, |
| * because we can rely on the pool to close the pipe for us. |
| */ |
| 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(03195) |
| "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(01228) "exec used but not allowed " |
| "in %s", r->filename); |
| SSI_CREATE_ERROR_BUCKET(ctx, f, bb); |
| return APR_SUCCESS; |
| } |
| |
| while (1) { |
| cgi_pfn_gtv(ctx, &tag, &tag_val, SSI_VALUE_DECODED); |
| if (!tag || !tag_val) { |
| break; |
| } |
| |
| if (!strcmp(tag, "cmd")) { |
| apr_status_t rv; |
| |
| cgi_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(01229) "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; |
| |
| cgi_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(01230) "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(01231) "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 int cgi_post_config(apr_pool_t *p, apr_pool_t *plog, |
| apr_pool_t *ptemp, server_rec *s) |
| { |
| cgi_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler); |
| cgi_pfn_gtv = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_get_tag_and_value); |
| cgi_pfn_ps = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_parse_string); |
| |
| if ((cgi_pfn_reg_with_ssi) && (cgi_pfn_gtv) && (cgi_pfn_ps)) { |
| /* Required by mod_include filter. This is how mod_cgi registers |
| * with mod_include to provide processing of the exec directive. |
| */ |
| cgi_pfn_reg_with_ssi("exec", handle_exec); |
| } |
| |
| /* This is the means by which unusual (non-unix) os's may find alternate |
| * means to run a given command (e.g. shebang/registry parsing on Win32) |
| */ |
| cgi_build_command = APR_RETRIEVE_OPTIONAL_FN(ap_cgi_build_command); |
| if (!cgi_build_command) { |
| cgi_build_command = default_build_command; |
| } |
| return OK; |
| } |
| |
| static void register_hooks(apr_pool_t *p) |
| { |
| static const char * const aszPre[] = { "mod_include.c", NULL }; |
| ap_hook_handler(cgi_handler, NULL, NULL, APR_HOOK_MIDDLE); |
| ap_hook_post_config(cgi_post_config, aszPre, NULL, APR_HOOK_REALLY_FIRST); |
| } |
| |
| AP_DECLARE_MODULE(cgi) = |
| { |
| STANDARD20_MODULE_STUFF, |
| NULL, /* dir config creater */ |
| NULL, /* dir merger --- default is to override */ |
| create_cgi_config, /* server config */ |
| merge_cgi_config, /* merge server config */ |
| cgi_cmds, /* command apr_table_t */ |
| register_hooks /* register hooks */ |
| }; |
