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Diffstat (limited to 'modules/aaa/mod_authz_dbm.c')
| -rw-r--r-- | modules/aaa/mod_authz_dbm.c | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/modules/aaa/mod_authz_dbm.c b/modules/aaa/mod_authz_dbm.c new file mode 100644 index 0000000..843d9a8 --- /dev/null +++ b/modules/aaa/mod_authz_dbm.c @@ -0,0 +1,336 @@ +/* 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. + */ + +#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 "ap_provider.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" +#include "mod_authz_owner.h" + +typedef struct { + const char *grpfile; + const char *dbmtype; +} 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"; + + 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"), + {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, + const char *dbmgrpfile, const 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; +} + +static authz_status dbmgroup_check_authorization(request_rec *r, + const char *require_args, + const void *parsed_require_args) +{ + authz_dbm_config_rec *conf = ap_get_module_config(r->per_dir_config, + &authz_dbm_module); + char *user = r->user; + + const char *err = NULL; + const ap_expr_info_t *expr = parsed_require_args; + const char *require; + + const char *t; + char *w; + const char *orig_groups = NULL; + const char *realm = ap_auth_name(r); + const char *groups; + char *v; + + if (!user) { + return AUTHZ_DENIED_NO_USER; + } + + if (!conf->grpfile) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01798) + "No group file was specified in the configuration"); + return AUTHZ_DENIED; + } + + /* 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, APLOGNO(01799) + "could not open dbm (type %s) group access " + "file: %s", conf->dbmtype, conf->grpfile); + return AUTHZ_GENERAL_ERROR; + } + + if (groups == NULL) { + /* no groups available, so exit immediately */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01800) + "Authorization of user %s to access %s failed, reason: " + "user doesn't appear in DBM group file (%s).", + r->user, r->uri, conf->grpfile); + return AUTHZ_DENIED; + } + + orig_groups = groups; + } + + require = ap_expr_str_exec(r, expr, &err); + if (err) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(02591) + "authz_dbm authorize: require dbm-group: Can't " + "evaluate require expression: %s", err); + return AUTHZ_DENIED; + } + + t = require; + while ((w = ap_getword_white(r->pool, &t)) && w[0]) { + groups = orig_groups; + while (groups[0]) { + v = ap_getword(r->pool, &groups, ','); + if (!strcmp(v, w)) { + return AUTHZ_GRANTED; + } + } + } + + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01801) + "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 dbmfilegroup_check_authorization(request_rec *r, + const char *require_args, + const void *parsed_require_args) +{ + authz_dbm_config_rec *conf = ap_get_module_config(r->per_dir_config, + &authz_dbm_module); + char *user = r->user; + const char *realm = ap_auth_name(r); + const char *filegroup = NULL; + apr_status_t status; + const char *groups; + char *v; + + if (!user) { + return AUTHZ_DENIED_NO_USER; + } + + if (!conf->grpfile) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01802) + "No group file was specified in the configuration"); + return AUTHZ_DENIED; + } + + /* fetch group data from dbm file. */ + 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, APLOGNO(01803) + "could not open dbm (type %s) group access " + "file: %s", conf->dbmtype, conf->grpfile); + return AUTHZ_DENIED; + } + + if (groups == NULL) { + /* no groups available, so exit immediately */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01804) + "Authorization of user %s to access %s failed, reason: " + "user doesn't appear in DBM group file (%s).", + r->user, r->uri, conf->grpfile); + return AUTHZ_DENIED; + } + + filegroup = authz_owner_get_file_group(r); + + if (filegroup) { + while (groups[0]) { + v = ap_getword(r->pool, &groups, ','); + if (!strcmp(v, filegroup)) { + return AUTHZ_GRANTED; + } + } + } + + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01805) + "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 const char *dbm_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_dbmgroup_provider = +{ + &dbmgroup_check_authorization, + &dbm_parse_config, +}; + +static const authz_provider authz_dbmfilegroup_provider = +{ + &dbmfilegroup_check_authorization, + NULL, +}; + +static void authz_dbm_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, "dbm-group", + AUTHZ_PROVIDER_VERSION, + &authz_dbmgroup_provider, + AP_AUTH_INTERNAL_PER_CONF); + ap_register_auth_provider(p, AUTHZ_PROVIDER_GROUP, "dbm-file-group", + AUTHZ_PROVIDER_VERSION, + &authz_dbmfilegroup_provider, + AP_AUTH_INTERNAL_PER_CONF); + ap_hook_optional_fn_retrieve(authz_dbm_getfns, NULL, NULL, APR_HOOK_MIDDLE); +} + +AP_DECLARE_MODULE(authz_dbm) = +{ + 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 */ +}; |