| /* Copyright 2002-2004 The Apache Software Foundation |
| * |
| * Licensed 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. |
| */ |
| |
| #define APR_WANT_STRFUNC |
| #include "apr_want.h" |
| #include "apr_strings.h" |
| #include "apr_dbm.h" |
| #include "apr_md5.h" |
| |
| #include "httpd.h" |
| #include "http_config.h" |
| #include "http_core.h" |
| #include "http_log.h" |
| #include "http_protocol.h" |
| #include "http_request.h" /* for ap_hook_(check_user_id | auth_checker)*/ |
| |
| #include "mod_auth.h" |
| |
| typedef struct { |
| char *grpfile; |
| char *dbmtype; |
| int authoritative; |
| } authz_dbm_config_rec; |
| |
| /* This should go into APR; perhaps with some nice |
| * caching/locking/flocking of the open dbm file. |
| */ |
| static char *get_dbm_entry_as_str(apr_pool_t *pool, apr_dbm_t *f, char *key) |
| { |
| apr_datum_t d, q; |
| q.dptr = key; |
| |
| #ifndef NETSCAPE_DBM_COMPAT |
| q.dsize = strlen(q.dptr); |
| #else |
| q.dsize = strlen(q.dptr) + 1; |
| #endif |
| |
| if (apr_dbm_fetch(f, q, &d) == APR_SUCCESS && d.dptr) { |
| return apr_pstrmemdup(pool, d.dptr, d.dsize); |
| } |
| |
| return NULL; |
| } |
| |
| static void *create_authz_dbm_dir_config(apr_pool_t *p, char *d) |
| { |
| authz_dbm_config_rec *conf = apr_palloc(p, sizeof(*conf)); |
| |
| conf->grpfile = NULL; |
| conf->dbmtype = "default"; |
| conf->authoritative = 1; /* fortress is secure by default */ |
| |
| return conf; |
| } |
| |
| static const command_rec authz_dbm_cmds[] = |
| { |
| AP_INIT_TAKE1("AuthDBMGroupFile", ap_set_file_slot, |
| (void *)APR_OFFSETOF(authz_dbm_config_rec, grpfile), |
| OR_AUTHCFG, "database file containing group names and member user IDs"), |
| AP_INIT_TAKE1("AuthzDBMType", ap_set_string_slot, |
| (void *)APR_OFFSETOF(authz_dbm_config_rec, dbmtype), |
| OR_AUTHCFG, "what type of DBM file the group file is"), |
| AP_INIT_FLAG("AuthzDBMAuthoritative", ap_set_flag_slot, |
| (void *)APR_OFFSETOF(authz_dbm_config_rec, authoritative), |
| OR_AUTHCFG, "Set to 'Off' to allow access control to be passed along to " |
| "lower modules, if the group required is not found or empty, or the user " |
| " is not in the required groups. (default is On.)"), |
| {NULL} |
| }; |
| |
| module AP_MODULE_DECLARE_DATA authz_dbm_module; |
| |
| /* We do something strange with the group file. If the group file |
| * contains any : we assume the format is |
| * key=username value=":"groupname [":"anything here is ignored] |
| * otherwise we now (0.8.14+) assume that the format is |
| * key=username value=groupname |
| * The first allows the password and group files to be the same |
| * physical DBM file; key=username value=password":"groupname[":"anything] |
| * |
| * mark@telescope.org, 22Sep95 |
| */ |
| |
| static apr_status_t get_dbm_grp(request_rec *r, char *key1, char *key2, |
| char *dbmgrpfile, char *dbtype, |
| const char ** out) |
| { |
| char *grp_colon, *val; |
| apr_status_t retval; |
| apr_dbm_t *f; |
| |
| retval = apr_dbm_open_ex(&f, dbtype, dbmgrpfile, APR_DBM_READONLY, |
| APR_OS_DEFAULT, r->pool); |
| |
| if (retval != APR_SUCCESS) { |
| return retval; |
| } |
| |
| /* Try key2 only if key1 failed */ |
| if (!(val = get_dbm_entry_as_str(r->pool, f, key1))) { |
| val = get_dbm_entry_as_str(r->pool, f, key2); |
| } |
| |
| apr_dbm_close(f); |
| |
| if (val && (grp_colon = ap_strchr(val, ':')) != NULL) { |
| char *grp_colon2 = ap_strchr(++grp_colon, ':'); |
| |
| if (grp_colon2) { |
| *grp_colon2 = '\0'; |
| } |
| *out = grp_colon; |
| } |
| else { |
| *out = val; |
| } |
| |
| return retval; |
| } |
| |
| /* Checking ID */ |
| static int dbm_check_auth(request_rec *r) |
| { |
| authz_dbm_config_rec *conf = ap_get_module_config(r->per_dir_config, |
| &authz_dbm_module); |
| char *user = r->user; |
| int m = r->method_number; |
| const apr_array_header_t *reqs_arr = ap_requires(r); |
| require_line *reqs = reqs_arr ? (require_line *) reqs_arr->elts : NULL; |
| register int x; |
| const char *t; |
| char *w; |
| int required_group = 0; |
| const char *filegroup = NULL; |
| const char *orig_groups = NULL; |
| char *reason = NULL; |
| |
| if (!conf->grpfile) { |
| return DECLINED; |
| } |
| |
| if (!reqs_arr) { |
| return DECLINED; |
| } |
| |
| for (x = 0; x < reqs_arr->nelts; x++) { |
| |
| if (!(reqs[x].method_mask & (AP_METHOD_BIT << m))) { |
| continue; |
| } |
| |
| t = reqs[x].requirement; |
| w = ap_getword_white(r->pool, &t); |
| |
| if (!strcmp(w, "file-group")) { |
| filegroup = apr_table_get(r->notes, AUTHZ_GROUP_NOTE); |
| |
| if (!filegroup) { |
| /* mod_authz_owner is not present or not |
| * authoritative. We are just a helper module for testing |
| * group membership, so we don't care and decline. |
| */ |
| continue; |
| } |
| } |
| |
| if (!strcmp(w, "group") || filegroup) { |
| const char *realm = ap_auth_name(r); |
| const char *groups; |
| char *v; |
| |
| /* remember that actually a group is required */ |
| required_group = 1; |
| |
| /* fetch group data from dbm file only once. */ |
| if (!orig_groups) { |
| apr_status_t status; |
| |
| status = get_dbm_grp(r, apr_pstrcat(r->pool, user, ":", realm, |
| NULL), |
| user, |
| conf->grpfile, conf->dbmtype, &groups); |
| |
| if (status != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, |
| "could not open dbm (type %s) group access " |
| "file: %s", conf->dbmtype, conf->grpfile); |
| return HTTP_INTERNAL_SERVER_ERROR; |
| } |
| |
| if (groups == NULL) { |
| /* no groups available, so exit immediately */ |
| reason = apr_psprintf(r->pool, |
| "user doesn't appear in DBM group " |
| "file (%s).", conf->grpfile); |
| break; |
| } |
| |
| orig_groups = groups; |
| } |
| |
| if (filegroup) { |
| groups = orig_groups; |
| while (groups[0]) { |
| v = ap_getword(r->pool, &groups, ','); |
| if (!strcmp(v, filegroup)) { |
| return OK; |
| } |
| } |
| |
| if (conf->authoritative) { |
| reason = apr_psprintf(r->pool, |
| "file group '%s' does not match.", |
| filegroup); |
| break; |
| } |
| |
| /* now forget the filegroup, thus alternatively require'd |
| groups get a real chance */ |
| filegroup = NULL; |
| } |
| else { |
| while (t[0]) { |
| w = ap_getword_white(r->pool, &t); |
| groups = orig_groups; |
| while (groups[0]) { |
| v = ap_getword(r->pool, &groups, ','); |
| if (!strcmp(v, w)) { |
| return OK; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| /* No applicable "require group" for this method seen */ |
| if (!required_group || !conf->authoritative) { |
| return DECLINED; |
| } |
| |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, |
| "Authorization of user %s to access %s failed, reason: %s", |
| r->user, r->uri, |
| reason ? reason : "user is not part of the " |
| "'require'ed group(s)."); |
| |
| ap_note_auth_failure(r); |
| return HTTP_UNAUTHORIZED; |
| } |
| |
| static void register_hooks(apr_pool_t *p) |
| { |
| static const char * const aszPre[]={ "mod_authz_owner.c", NULL }; |
| |
| ap_hook_auth_checker(dbm_check_auth, aszPre, NULL, APR_HOOK_MIDDLE); |
| } |
| |
| module AP_MODULE_DECLARE_DATA authz_dbm_module = |
| { |
| STANDARD20_MODULE_STUFF, |
| create_authz_dbm_dir_config, /* dir config creater */ |
| NULL, /* dir merger --- default is to override */ |
| NULL, /* server config */ |
| NULL, /* merge server config */ |
| authz_dbm_cmds, /* command apr_table_t */ |
| register_hooks /* register hooks */ |
| }; |
