| /* 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. |
| */ |
| |
| /* This module is triggered by an |
| * |
| * AuthGroupFile standard /path/to/file |
| * |
| * and the presence 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 |
| * |
| */ |
| |
| #include "apr_strings.h" |
| #include "apr_lib.h" /* apr_isspace */ |
| |
| #include "ap_config.h" |
| #include "ap_provider.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 "util_varbuf.h" |
| |
| #include "mod_auth.h" |
| #include "mod_authz_owner.h" |
| |
| typedef struct { |
| char *groupfile; |
| } 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; |
| return conf; |
| } |
| |
| static const command_rec authz_groupfile_cmds[] = |
| { |
| AP_INIT_TAKE1("AuthGroupFile", ap_set_file_slot, |
| (void *)APR_OFFSETOF(authz_groupfile_config_rec, groupfile), |
| OR_AUTHCFG, |
| "text file containing group names and member user IDs"), |
| {NULL} |
| }; |
| |
| module AP_MODULE_DECLARE_DATA authz_groupfile_module; |
| |
| #define VARBUF_INIT_LEN 512 |
| #define VARBUF_MAX_LEN (16*1024*1024) |
| 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; |
| struct ap_varbuf vb; |
| 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); |
| apr_pool_tag(sp, "authz_groupfile (groups_for_user)"); |
| |
| ap_varbuf_init(p, &vb, VARBUF_INIT_LEN); |
| |
| while (!(ap_varbuf_cfg_getline(&vb, f, VARBUF_MAX_LEN))) { |
| if ((vb.buf[0] == '#') || (!vb.buf[0])) { |
| continue; |
| } |
| ll = vb.buf; |
| 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); |
| ap_varbuf_free(&vb); |
| |
| *out = grps; |
| return APR_SUCCESS; |
| } |
| |
| static authz_status group_check_authorization(request_rec *r, |
| const char *require_args, |
| const void *parsed_require_args) |
| { |
| authz_groupfile_config_rec *conf = ap_get_module_config(r->per_dir_config, |
| &authz_groupfile_module); |
| char *user = r->user; |
| |
| const char *err = NULL; |
| const ap_expr_info_t *expr = parsed_require_args; |
| const char *require; |
| |
| const char *t, *w; |
| apr_table_t *grpstatus = NULL; |
| apr_status_t status; |
| |
| if (!user) { |
| return AUTHZ_DENIED_NO_USER; |
| } |
| |
| /* If there is no group file - then we are not |
| * configured. So decline. |
| */ |
| if (!(conf->groupfile)) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01664) |
| "No group file was specified in the configuration"); |
| return AUTHZ_DENIED; |
| } |
| |
| status = groups_for_user(r->pool, user, conf->groupfile, |
| &grpstatus); |
| |
| if (status != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01665) |
| "Could not open group file: %s", |
| conf->groupfile); |
| return AUTHZ_DENIED; |
| } |
| |
| if (apr_is_empty_table(grpstatus)) { |
| /* no groups available, so exit immediately */ |
| ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(01666) |
| "Authorization of user %s to access %s failed, reason: " |
| "user doesn't appear in group file (%s).", |
| r->user, r->uri, conf->groupfile); |
| return AUTHZ_DENIED; |
| } |
| |
| require = ap_expr_str_exec(r, expr, &err); |
| if (err) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02592) |
| "authz_groupfile authorize: require group: Can't " |
| "evaluate require expression: %s", err); |
| return AUTHZ_DENIED; |
| } |
| |
| t = require; |
| while ((w = ap_getword_conf(r->pool, &t)) && w[0]) { |
| if (apr_table_get(grpstatus, w)) { |
| return AUTHZ_GRANTED; |
| } |
| } |
| |
| ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01667) |
| "Authorization of user %s to access %s failed, reason: " |
| "user is not part of the 'require'ed group(s).", |
| r->user, r->uri); |
| |
| return AUTHZ_DENIED; |
| } |
| |
| static APR_OPTIONAL_FN_TYPE(authz_owner_get_file_group) *authz_owner_get_file_group; |
| |
| static authz_status filegroup_check_authorization(request_rec *r, |
| const char *require_args, |
| const void *parsed_require_args) |
| { |
| authz_groupfile_config_rec *conf = ap_get_module_config(r->per_dir_config, |
| &authz_groupfile_module); |
| char *user = r->user; |
| apr_table_t *grpstatus = NULL; |
| apr_status_t status; |
| const char *filegroup = NULL; |
| |
| if (!user) { |
| return AUTHZ_DENIED_NO_USER; |
| } |
| |
| /* If there is no group file - then we are not |
| * configured. So decline. |
| */ |
| if (!(conf->groupfile)) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01668) |
| "No group file was specified in the configuration"); |
| return AUTHZ_DENIED; |
| } |
| |
| status = groups_for_user(r->pool, user, conf->groupfile, |
| &grpstatus); |
| if (status != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01669) |
| "Could not open group file: %s", |
| conf->groupfile); |
| return AUTHZ_DENIED; |
| } |
| |
| if (apr_is_empty_table(grpstatus)) { |
| /* no groups available, so exit immediately */ |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01670) |
| "Authorization of user %s to access %s failed, reason: " |
| "user doesn't appear in group file (%s).", |
| r->user, r->uri, conf->groupfile); |
| return AUTHZ_DENIED; |
| } |
| |
| filegroup = authz_owner_get_file_group(r); |
| |
| if (filegroup) { |
| if (apr_table_get(grpstatus, filegroup)) { |
| return AUTHZ_GRANTED; |
| } |
| } |
| else { |
| /* No need to emit a error log entry because the call |
| to authz_owner_get_file_group already did it |
| for us. |
| */ |
| return AUTHZ_DENIED; |
| } |
| |
| ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01671) |
| "Authorization of user %s to access %s failed, reason: " |
| "user is not part of the 'require'ed file group.", |
| r->user, r->uri); |
| |
| return AUTHZ_DENIED; |
| } |
| |
| static const char *groupfile_parse_config(cmd_parms *cmd, const char *require_line, |
| const void **parsed_require_line) |
| { |
| const char *expr_err = NULL; |
| ap_expr_info_t *expr; |
| |
| expr = ap_expr_parse_cmd(cmd, require_line, AP_EXPR_FLAG_STRING_RESULT, |
| &expr_err, NULL); |
| |
| if (expr_err) |
| return apr_pstrcat(cmd->temp_pool, |
| "Cannot parse expression in require line: ", |
| expr_err, NULL); |
| |
| *parsed_require_line = expr; |
| |
| return NULL; |
| } |
| |
| static const authz_provider authz_group_provider = |
| { |
| &group_check_authorization, |
| &groupfile_parse_config, |
| }; |
| |
| static const authz_provider authz_filegroup_provider = |
| { |
| &filegroup_check_authorization, |
| NULL, |
| }; |
| |
| |
| static void authz_groupfile_getfns(void) |
| { |
| authz_owner_get_file_group = APR_RETRIEVE_OPTIONAL_FN(authz_owner_get_file_group); |
| } |
| |
| static void register_hooks(apr_pool_t *p) |
| { |
| ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "group", |
| AUTHZ_PROVIDER_VERSION, |
| &authz_group_provider, |
| AP_AUTH_INTERNAL_PER_CONF); |
| ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "file-group", |
| AUTHZ_PROVIDER_VERSION, |
| &authz_filegroup_provider, |
| AP_AUTH_INTERNAL_PER_CONF); |
| ap_hook_optional_fn_retrieve(authz_groupfile_getfns, NULL, NULL, APR_HOOK_MIDDLE); |
| } |
| |
| AP_DECLARE_MODULE(authz_groupfile) = |
| { |
| 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 */ |
| }; |
