/* 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. */ #include "ap_provider.h" #include "httpd.h" #include "http_config.h" #include "http_log.h" #include "apr_lib.h" #include "apr_dbd.h" #include "mod_dbd.h" #include "apr_strings.h" #include "mod_auth.h" #include "apr_md5.h" #include "apu_version.h" module AP_MODULE_DECLARE_DATA authn_dbd_module; typedef struct { const char *user; const char *realm; } authn_dbd_conf; typedef struct { const char *label; const char *query; } authn_dbd_rec; /* optional function - look it up once in post_config */ static ap_dbd_t *(*authn_dbd_acquire_fn)(request_rec*) = NULL; static void (*authn_dbd_prepare_fn)(server_rec*, const char*, const char*) = NULL; static void *authn_dbd_cr_conf(apr_pool_t *pool, char *dummy) { authn_dbd_conf *ret = apr_pcalloc(pool, sizeof(authn_dbd_conf)); return ret; } static void *authn_dbd_merge_conf(apr_pool_t *pool, void *BASE, void *ADD) { authn_dbd_conf *add = ADD; authn_dbd_conf *base = BASE; authn_dbd_conf *ret = apr_palloc(pool, sizeof(authn_dbd_conf)); ret->user = (add->user == NULL) ? base->user : add->user; ret->realm = (add->realm == NULL) ? base->realm : add->realm; return ret; } static const char *authn_dbd_prepare(cmd_parms *cmd, void *cfg, const char *query) { static unsigned int label_num = 0; char *label; if (authn_dbd_prepare_fn == NULL) { authn_dbd_prepare_fn = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_prepare); if (authn_dbd_prepare_fn == NULL) { return "You must load mod_dbd to enable AuthDBD functions"; } authn_dbd_acquire_fn = APR_RETRIEVE_OPTIONAL_FN(ap_dbd_acquire); } label = apr_psprintf(cmd->pool, "authn_dbd_%d", ++label_num); authn_dbd_prepare_fn(cmd->server, query, label); /* save the label here for our own use */ return ap_set_string_slot(cmd, cfg, label); } static const command_rec authn_dbd_cmds[] = { AP_INIT_TAKE1("AuthDBDUserPWQuery", authn_dbd_prepare, (void *)APR_OFFSETOF(authn_dbd_conf, user), ACCESS_CONF, "Query used to fetch password for user"), AP_INIT_TAKE1("AuthDBDUserRealmQuery", authn_dbd_prepare, (void *)APR_OFFSETOF(authn_dbd_conf, realm), ACCESS_CONF, "Query used to fetch password for user+realm"), {NULL} }; static authn_status authn_dbd_password(request_rec *r, const char *user, const char *password) { apr_status_t rv; const char *dbd_password = NULL; apr_dbd_prepared_t *statement; apr_dbd_results_t *res = NULL; apr_dbd_row_t *row = NULL; authn_dbd_conf *conf = ap_get_module_config(r->per_dir_config, &authn_dbd_module); ap_dbd_t *dbd = authn_dbd_acquire_fn(r); if (dbd == NULL) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Failed to acquire database connection to look up " "user '%s'", user); return AUTH_GENERAL_ERROR; } if (conf->user == NULL) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No AuthDBDUserPWQuery has been specified"); return AUTH_GENERAL_ERROR; } statement = apr_hash_get(dbd->prepared, conf->user, APR_HASH_KEY_STRING); if (statement == NULL) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "A prepared statement could not be found for " "AuthDBDUserPWQuery with the key '%s'", conf->user); return AUTH_GENERAL_ERROR; } if (apr_dbd_pvselect(dbd->driver, r->pool, dbd->handle, &res, statement, 0, user, NULL) != 0) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Query execution error looking up '%s' " "in database", user); return AUTH_GENERAL_ERROR; } for (rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1); rv != -1; rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) { if (rv != 0) { ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, "Error retrieving results while looking up '%s' " "in database", user); return AUTH_GENERAL_ERROR; } if (dbd_password == NULL) { #if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 3) /* add the rest of the columns to the environment */ int i = 1; const char *name; for (name = apr_dbd_get_name(dbd->driver, res, i); name != NULL; name = apr_dbd_get_name(dbd->driver, res, i)) { char *str = apr_pstrcat(r->pool, AUTHN_PREFIX, name, NULL); int j = sizeof(AUTHN_PREFIX)-1; /* string length of "AUTHENTICATE_", excluding the trailing NIL */ while (str[j]) { if (!apr_isalnum(str[j])) { str[j] = '_'; } else { str[j] = apr_toupper(str[j]); } j++; } apr_table_set(r->subprocess_env, str, apr_dbd_get_entry(dbd->driver, row, i)); i++; } #endif dbd_password = apr_dbd_get_entry(dbd->driver, row, 0); } /* we can't break out here or row won't get cleaned up */ } if (!dbd_password) { return AUTH_USER_NOT_FOUND; } rv = apr_password_validate(password, dbd_password); if (rv != APR_SUCCESS) { return AUTH_DENIED; } return AUTH_GRANTED; } static authn_status authn_dbd_realm(request_rec *r, const char *user, const char *realm, char **rethash) { apr_status_t rv; const char *dbd_hash = NULL; apr_dbd_prepared_t *statement; apr_dbd_results_t *res = NULL; apr_dbd_row_t *row = NULL; authn_dbd_conf *conf = ap_get_module_config(r->per_dir_config, &authn_dbd_module); ap_dbd_t *dbd = authn_dbd_acquire_fn(r); if (dbd == NULL) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Failed to acquire database connection to look up " "user '%s:%s'", user, realm); return AUTH_GENERAL_ERROR; } if (conf->realm == NULL) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "No AuthDBDUserRealmQuery has been specified"); return AUTH_GENERAL_ERROR; } statement = apr_hash_get(dbd->prepared, conf->realm, APR_HASH_KEY_STRING); if (statement == NULL) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "A prepared statement could not be found for " "AuthDBDUserRealmQuery with the key '%s'", conf->realm); return AUTH_GENERAL_ERROR; } if (apr_dbd_pvselect(dbd->driver, r->pool, dbd->handle, &res, statement, 0, user, realm, NULL) != 0) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Query execution error looking up '%s:%s' " "in database", user, realm); return AUTH_GENERAL_ERROR; } for (rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1); rv != -1; rv = apr_dbd_get_row(dbd->driver, r->pool, res, &row, -1)) { if (rv != 0) { ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, "Error retrieving results while looking up '%s:%s' " "in database", user, realm); return AUTH_GENERAL_ERROR; } if (dbd_hash == NULL) { #if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 3) /* add the rest of the columns to the environment */ int i = 1; const char *name; for (name = apr_dbd_get_name(dbd->driver, res, i); name != NULL; name = apr_dbd_get_name(dbd->driver, res, i)) { char *str = apr_pstrcat(r->pool, AUTHN_PREFIX, name, NULL); int j = sizeof(AUTHN_PREFIX)-1; /* string length of "AUTHENTICATE_", excluding the trailing NIL */ while (str[j]) { if (!apr_isalnum(str[j])) { str[j] = '_'; } else { str[j] = apr_toupper(str[j]); } j++; } apr_table_set(r->subprocess_env, str, apr_dbd_get_entry(dbd->driver, row, i)); i++; } #endif dbd_hash = apr_dbd_get_entry(dbd->driver, row, 0); } /* we can't break out here or row won't get cleaned up */ } if (!dbd_hash) { return AUTH_USER_NOT_FOUND; } *rethash = apr_pstrdup(r->pool, dbd_hash); return AUTH_USER_FOUND; } static void authn_dbd_hooks(apr_pool_t *p) { static const authn_provider authn_dbd_provider = { &authn_dbd_password, &authn_dbd_realm }; ap_register_provider(p, AUTHN_PROVIDER_GROUP, "dbd", "0", &authn_dbd_provider); } module AP_MODULE_DECLARE_DATA authn_dbd_module = { STANDARD20_MODULE_STUFF, authn_dbd_cr_conf, authn_dbd_merge_conf, NULL, NULL, authn_dbd_cmds, authn_dbd_hooks };
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