modules/aaa/mod_authz_dbm.c - httpd - Git at Google

 /* 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 */
 };
	/* 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 */
	};