1/* Licensed to the Apache Software Foundation (ASF) under one or more 2 * contributor license agreements. See the NOTICE file distributed with 3 * this work for additional information regarding copyright ownership. 4 * The ASF licenses this file to You under the Apache License, Version 2.0 5 * (the "License"); you may not use this file except in compliance with 6 * the License. You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "httpd.h" 18#include "http_config.h" 19#include "http_core.h" 20#include "http_log.h" 21#include "http_request.h" 22#include "apr_strings.h" 23#include "unixd.h" 24#include "mpm_common.h" 25#include "mod_suexec.h" 26 27module AP_MODULE_DECLARE_DATA suexec_module; 28 29/* 30 * Create a configuration specific to this module for a server or directory 31 * location, and fill it with the default settings. 32 */ 33static void *mkconfig(apr_pool_t *p) 34{ 35 suexec_config_t *cfg = apr_palloc(p, sizeof(suexec_config_t)); 36 37 cfg->active = 0; 38 return cfg; 39} 40 41/* 42 * Respond to a callback to create configuration record for a server or 43 * vhost environment. 44 */ 45static void *create_mconfig_for_server(apr_pool_t *p, server_rec *s) 46{ 47 return mkconfig(p); 48} 49 50/* 51 * Respond to a callback to create a config record for a specific directory. 52 */ 53static void *create_mconfig_for_directory(apr_pool_t *p, char *dir) 54{ 55 return mkconfig(p); 56} 57 58static const char *set_suexec_ugid(cmd_parms *cmd, void *mconfig, 59 const char *uid, const char *gid) 60{ 61 suexec_config_t *cfg = (suexec_config_t *) mconfig; 62 const char *err = ap_check_cmd_context(cmd, NOT_IN_DIR_LOC_FILE); 63 64 if (err != NULL) { 65 return err; 66 } 67 68 if (!ap_unixd_config.suexec_enabled) { 69 return apr_pstrcat(cmd->pool, "SuexecUserGroup configured, but " 70 "suEXEC is disabled: ", 71 ap_unixd_config.suexec_disabled_reason, NULL); 72 } 73 74 cfg->ugid.uid = ap_uname2id(uid); 75 cfg->ugid.gid = ap_gname2id(gid); 76 cfg->ugid.userdir = 0; 77 cfg->active = 1; 78 79 return NULL; 80} 81 82static ap_unix_identity_t *get_suexec_id_doer(const request_rec *r) 83{ 84 suexec_config_t *cfg = 85 (suexec_config_t *) ap_get_module_config(r->per_dir_config, &suexec_module); 86 87 return cfg->active ? &cfg->ugid : NULL; 88} 89 90#define SUEXEC_POST_CONFIG_USERDATA "suexec_post_config_userdata" 91static int suexec_post_config(apr_pool_t *p, apr_pool_t *plog, 92 apr_pool_t *ptemp, server_rec *s) 93{ 94 void *reported; 95 96 apr_pool_userdata_get(&reported, SUEXEC_POST_CONFIG_USERDATA, 97 s->process->pool); 98 99 if ((reported == NULL) && ap_unixd_config.suexec_enabled) { 100 ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(01232) 101 "suEXEC mechanism enabled (wrapper: %s)", SUEXEC_BIN); 102 103 apr_pool_userdata_set((void *)1, SUEXEC_POST_CONFIG_USERDATA, 104 apr_pool_cleanup_null, s->process->pool); 105 } 106 107 return OK; 108} 109#undef SUEXEC_POST_CONFIG_USERDATA 110 111/* 112 * Define the directives specific to this module. This structure is referenced 113 * later by the 'module' structure. 114 */ 115static const command_rec suexec_cmds[] = 116{ 117 /* XXX - Another important reason not to allow this in .htaccess is that 118 * the ap_[ug]name2id() is not thread-safe */ 119 AP_INIT_TAKE2("SuexecUserGroup", set_suexec_ugid, NULL, RSRC_CONF, 120 "User and group for spawned processes"), 121 { NULL } 122}; 123 124static void suexec_hooks(apr_pool_t *p) 125{ 126 ap_hook_get_suexec_identity(get_suexec_id_doer,NULL,NULL,APR_HOOK_MIDDLE); 127 ap_hook_post_config(suexec_post_config,NULL,NULL,APR_HOOK_MIDDLE); 128} 129 130AP_DECLARE_MODULE(suexec) = 131{ 132 STANDARD20_MODULE_STUFF, 133 create_mconfig_for_directory, /* create per-dir config */ 134 NULL, /* merge per-dir config */ 135 create_mconfig_for_server, /* server config */ 136 NULL, /* merge server config */ 137 suexec_cmds, /* command table */ 138 suexec_hooks /* register hooks */ 139}; 140