| /* 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. |
| */ |
| |
| /* This module is triggered by an |
| * |
| * AuthGroupFile standard /path/to/file |
| * |
| * and the presense of a |
| * |
| * require group <list-of-groups> |
| * |
| * In an applicable limit/directory block for that method. |
| * |
| * If there are no AuthGroupFile directives valid for |
| * the request; we DECLINED. |
| * |
| * If the AuthGroupFile is defined; but somehow not |
| * accessible: we SERVER_ERROR (was DECLINED). |
| * |
| * If there are no 'require ' directives defined for |
| * this request then we DECLINED (was OK). |
| * |
| * If there are no 'require ' directives valid for |
| * this request method then we DECLINED. (was OK) |
| * |
| * If there are any 'require group' blocks and we |
| * are not in any group - we HTTP_UNAUTHORIZE |
| * unless we are non-authoritative; in which |
| * case we DECLINED. |
| * |
| */ |
| |
| #include "apr_strings.h" |
| #include "apr_lib.h" /* apr_isspace */ |
| |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "http_config.h" |
| #include "http_core.h" |
| #include "http_log.h" |
| #include "http_protocol.h" |
| #include "http_request.h" |
| |
| #include "mod_auth.h" |
| |
| typedef struct { |
| char *groupfile; |
| int authoritative; |
| } authz_groupfile_config_rec; |
| |
| static void *create_authz_groupfile_dir_config(apr_pool_t *p, char *d) |
| { |
| authz_groupfile_config_rec *conf = apr_palloc(p, sizeof(*conf)); |
| |
| conf->groupfile = NULL; |
| conf->authoritative = 1; /* keep the fortress secure by default */ |
| return conf; |
| } |
| |
| static const char *set_authz_groupfile_slot(cmd_parms *cmd, void *offset, const char *f, |
| const char *t) |
| { |
| if (t && strcmp(t, "standard")) { |
| return apr_pstrcat(cmd->pool, "Invalid auth file type: ", t, NULL); |
| } |
| |
| return ap_set_file_slot(cmd, offset, f); |
| } |
| |
| static const command_rec authz_groupfile_cmds[] = |
| { |
| AP_INIT_TAKE12("AuthGroupFile", set_authz_groupfile_slot, |
| (void *)APR_OFFSETOF(authz_groupfile_config_rec, groupfile), |
| OR_AUTHCFG, |
| "text file containing group names and member user IDs"), |
| AP_INIT_FLAG("AuthzGroupFileAuthoritative", ap_set_flag_slot, |
| (void *)APR_OFFSETOF(authz_groupfile_config_rec, |
| authoritative), |
| OR_AUTHCFG, |
| "Set to 'Off' to allow access control to be passed along to " |
| "lower modules if the 'require group' fails. (default is " |
| "On)."), |
| {NULL} |
| }; |
| |
| module AP_MODULE_DECLARE_DATA authz_groupfile_module; |
| |
| static apr_status_t groups_for_user(apr_pool_t *p, char *user, char *grpfile, |
| apr_table_t ** out) |
| { |
| ap_configfile_t *f; |
| apr_table_t *grps = apr_table_make(p, 15); |
| apr_pool_t *sp; |
| char l[MAX_STRING_LEN]; |
| const char *group_name, *ll, *w; |
| apr_status_t status; |
| apr_size_t group_len; |
| |
| if ((status = ap_pcfg_openfile(&f, p, grpfile)) != APR_SUCCESS) { |
| return status ; |
| } |
| |
| apr_pool_create(&sp, p); |
| |
| while (!(ap_cfg_getline(l, MAX_STRING_LEN, f))) { |
| if ((l[0] == '#') || (!l[0])) { |
| continue; |
| } |
| ll = l; |
| apr_pool_clear(sp); |
| |
| group_name = ap_getword(sp, &ll, ':'); |
| group_len = strlen(group_name); |
| |
| while (group_len && apr_isspace(*(group_name + group_len - 1))) { |
| --group_len; |
| } |
| |
| while (ll[0]) { |
| w = ap_getword_conf(sp, &ll); |
| if (!strcmp(w, user)) { |
| apr_table_setn(grps, apr_pstrmemdup(p, group_name, group_len), |
| "in"); |
| break; |
| } |
| } |
| } |
| ap_cfg_closefile(f); |
| apr_pool_destroy(sp); |
| |
| *out = grps; |
| return APR_SUCCESS; |
| } |
| |
| /* Checking ID */ |
| |
| static int check_user_access(request_rec *r) |
| { |
| authz_groupfile_config_rec *conf = ap_get_module_config(r->per_dir_config, |
| &authz_groupfile_module); |
| char *user = r->user; |
| int m = r->method_number; |
| int required_group = 0; |
| register int x; |
| const char *t, *w; |
| apr_table_t *grpstatus = NULL; |
| const apr_array_header_t *reqs_arr = ap_requires(r); |
| require_line *reqs; |
| const char *filegroup = NULL; |
| char *reason = NULL; |
| |
| /* If there is no group file - then we are not |
| * configured. So decline. |
| */ |
| if (!(conf->groupfile)) { |
| return DECLINED; |
| } |
| |
| if (!reqs_arr) { |
| return DECLINED; /* XXX change from legacy */ |
| } |
| |
| reqs = (require_line *)reqs_arr->elts; |
| |
| 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); |
| |
| /* needs mod_authz_owner to be present */ |
| 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) { |
| required_group = 1; /* remember the requirement */ |
| |
| /* create group table only if actually needed. */ |
| if (!grpstatus) { |
| apr_status_t status; |
| |
| status = groups_for_user(r->pool, user, conf->groupfile, |
| &grpstatus); |
| |
| if (status != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, |
| "Could not open group file: %s", |
| conf->groupfile); |
| return HTTP_INTERNAL_SERVER_ERROR; |
| } |
| |
| if (apr_table_elts(grpstatus)->nelts == 0) { |
| /* no groups available, so exit immediately */ |
| reason = apr_psprintf(r->pool, |
| "user doesn't appear in group file " |
| "(%s).", conf->groupfile); |
| break; |
| } |
| } |
| |
| if (filegroup) { |
| if (apr_table_get(grpstatus, 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_conf(r->pool, &t); |
| if (apr_table_get(grpstatus, 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(check_user_access, aszPre, NULL, APR_HOOK_MIDDLE); |
| } |
| |
| module AP_MODULE_DECLARE_DATA authz_groupfile_module = |
| { |
| STANDARD20_MODULE_STUFF, |
| create_authz_groupfile_dir_config,/* dir config creater */ |
| NULL, /* dir merger -- default is to override */ |
| NULL, /* server config */ |
| NULL, /* merge server config */ |
| authz_groupfile_cmds, /* command apr_table_t */ |
| register_hooks /* register hooks */ |
| }; |
