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dbus/dbus/dbus-userdb.c
Havoc Pennington f14f2196cc 2004-08-28 Havoc Pennington <hp@redhat.com> 
* dbus/dbus-userdb.c (_dbus_is_console_user): remove unused variable

        More fixes from Steve Grubb

	* dbus/dbus-sysdeps.c (_dbus_connect_tcp_socket): fix fd leak
	(_dbus_listen_tcp_socket): fix fd leak

	* dbus/dbus-spawn.c (read_pid, read_ints): move the "again:" for
	EINTR to a bit lower in the code
2004-08-29 02:14:52 +00:00

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/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-userdb.c User database abstraction
*
* Copyright (C) 2003, 2004 Red Hat, Inc.
*
* Licensed under the Academic Free License version 2.1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "dbus-userdb.h"
#include "dbus-hash.h"
#include "dbus-test.h"
#include "dbus-internals.h"
#include "dbus-protocol.h"
#include <string.h>
/**
* Internals of DBusUserDatabase
*/
struct DBusUserDatabase
{
int refcount; /**< Reference count */
DBusHashTable *users; /**< Users in the database by UID */
DBusHashTable *groups; /**< Groups in the database by GID */
DBusHashTable *users_by_name; /**< Users in the database by name */
DBusHashTable *groups_by_name; /**< Groups in the database by name */
};
static void
free_user_info (void *data)
{
DBusUserInfo *info = data;
if (info == NULL) /* hash table will pass NULL */
return;
_dbus_user_info_free (info);
dbus_free (info);
}
static void
free_group_info (void *data)
{
DBusGroupInfo *info = data;
if (info == NULL) /* hash table will pass NULL */
return;
_dbus_group_info_free (info);
dbus_free (info);
}
static DBusUserInfo*
_dbus_user_database_lookup (DBusUserDatabase *db,
dbus_uid_t uid,
const DBusString *username,
DBusError *error)
{
DBusUserInfo *info;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
_dbus_assert (uid != DBUS_UID_UNSET || username != NULL);
if (uid != DBUS_UID_UNSET)
info = _dbus_hash_table_lookup_ulong (db->users, uid);
else
info = _dbus_hash_table_lookup_string (db->users_by_name, _dbus_string_get_const_data (username));
if (info)
{
_dbus_verbose ("Using cache for UID "DBUS_UID_FORMAT" information\n",
uid);
return info;
}
else
{
_dbus_verbose ("No cache for UID "DBUS_UID_FORMAT"\n",
uid);
info = dbus_new0 (DBusUserInfo, 1);
if (info == NULL)
{
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
return NULL;
}
if (uid != DBUS_UID_UNSET)
{
if (!_dbus_user_info_fill_uid (info, uid, error))
{
_DBUS_ASSERT_ERROR_IS_SET (error);
free_user_info (info);
return NULL;
}
}
else
{
if (!_dbus_user_info_fill (info, username, error))
{
_DBUS_ASSERT_ERROR_IS_SET (error);
free_user_info (info);
return NULL;
}
}
/* be sure we don't use these after here */
uid = DBUS_UID_UNSET;
username = NULL;
/* insert into hash */
if (!_dbus_hash_table_insert_ulong (db->users, info->uid, info))
{
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
free_user_info (info);
return NULL;
}
if (!_dbus_hash_table_insert_string (db->users_by_name,
info->username,
info))
{
_dbus_hash_table_remove_ulong (db->users, info->uid);
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
return NULL;
}
return info;
}
}
static DBusGroupInfo*
_dbus_user_database_lookup_group (DBusUserDatabase *db,
dbus_gid_t gid,
const DBusString *groupname,
DBusError *error)
{
DBusGroupInfo *info;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
if (gid != DBUS_GID_UNSET)
info = _dbus_hash_table_lookup_ulong (db->groups, gid);
else
info = _dbus_hash_table_lookup_string (db->groups_by_name,
_dbus_string_get_const_data (groupname));
if (info)
{
_dbus_verbose ("Using cache for GID "DBUS_GID_FORMAT" information\n",
gid);
return info;
}
else
{
_dbus_verbose ("No cache for GID "DBUS_GID_FORMAT"\n",
gid);
info = dbus_new0 (DBusGroupInfo, 1);
if (info == NULL)
{
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
return NULL;
}
if (!_dbus_group_info_fill_gid (info, gid, error))
{
_DBUS_ASSERT_ERROR_IS_SET (error);
free_group_info (info);
return NULL;
}
if (!_dbus_hash_table_insert_ulong (db->groups, info->gid, info))
{
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
free_group_info (info);
return NULL;
}
if (!_dbus_hash_table_insert_string (db->groups_by_name,
info->groupname,
info))
{
_dbus_hash_table_remove_ulong (db->groups, info->gid);
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
return NULL;
}
return info;
}
}
_DBUS_DEFINE_GLOBAL_LOCK(system_users);
static dbus_bool_t database_locked = FALSE;
static DBusUserDatabase *system_db = NULL;
static DBusString process_username;
static DBusString process_homedir;
static void
shutdown_system_db (void *data)
{
_dbus_user_database_unref (system_db);
system_db = NULL;
_dbus_string_free (&process_username);
_dbus_string_free (&process_homedir);
}
static dbus_bool_t
init_system_db (void)
{
_dbus_assert (database_locked);
if (system_db == NULL)
{
DBusError error;
const DBusUserInfo *info;
system_db = _dbus_user_database_new ();
if (system_db == NULL)
return FALSE;
dbus_error_init (&error);
if (!_dbus_user_database_get_uid (system_db,
_dbus_getuid (),
&info,
&error))
{
_dbus_user_database_unref (system_db);
system_db = NULL;
if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
{
dbus_error_free (&error);
return FALSE;
}
else
{
/* This really should not happen. */
_dbus_warn ("Could not get password database information for UID of current process: %s\n",
error.message);
dbus_error_free (&error);
return FALSE;
}
}
if (!_dbus_string_init (&process_username))
{
_dbus_user_database_unref (system_db);
system_db = NULL;
return FALSE;
}
if (!_dbus_string_init (&process_homedir))
{
_dbus_string_free (&process_username);
_dbus_user_database_unref (system_db);
system_db = NULL;
return FALSE;
}
if (!_dbus_string_append (&process_username,
info->username) ||
!_dbus_string_append (&process_homedir,
info->homedir) ||
!_dbus_register_shutdown_func (shutdown_system_db, NULL))
{
_dbus_string_free (&process_username);
_dbus_string_free (&process_homedir);
_dbus_user_database_unref (system_db);
system_db = NULL;
return FALSE;
}
}
return TRUE;
}
/**
* @addtogroup DBusInternalsUtils
* @{
*/
/**
* Locks global system user database.
*/
void
_dbus_user_database_lock_system (void)
{
_DBUS_LOCK (system_users);
database_locked = TRUE;
}
/**
* Unlocks global system user database.
*/
void
_dbus_user_database_unlock_system (void)
{
database_locked = FALSE;
_DBUS_UNLOCK (system_users);
}
/**
* Gets the system global user database;
* must be called with lock held (_dbus_user_database_lock_system()).
*
* @returns the database or #NULL if no memory
*/
DBusUserDatabase*
_dbus_user_database_get_system (void)
{
_dbus_assert (database_locked);
init_system_db ();
return system_db;
}
/**
* Gets username of user owning current process. The returned string
* is valid until dbus_shutdown() is called.
*
* @param username place to store pointer to username
* @returns #FALSE if no memory
*/
dbus_bool_t
_dbus_username_from_current_process (const DBusString **username)
{
_dbus_user_database_lock_system ();
if (!init_system_db ())
{
_dbus_user_database_unlock_system ();
return FALSE;
}
*username = &process_username;
_dbus_user_database_unlock_system ();
return TRUE;
}
/**
* Gets homedir of user owning current process. The returned string
* is valid until dbus_shutdown() is called.
*
* @param homedir place to store pointer to homedir
* @returns #FALSE if no memory
*/
dbus_bool_t
_dbus_homedir_from_current_process (const DBusString **homedir)
{
_dbus_user_database_lock_system ();
if (!init_system_db ())
{
_dbus_user_database_unlock_system ();
return FALSE;
}
*homedir = &process_homedir;
_dbus_user_database_unlock_system ();
return TRUE;
}
/**
* Gets user ID given username
*
* @param username the username
* @param uid return location for UID
* @returns #TRUE if username existed and we got the UID
*/
dbus_bool_t
_dbus_get_user_id (const DBusString *username,
dbus_uid_t *uid)
{
DBusCredentials creds;
if (!_dbus_credentials_from_username (username, &creds))
return FALSE;
if (creds.uid == DBUS_UID_UNSET)
return FALSE;
*uid = creds.uid;
return TRUE;
}
/**
* Checks to see if the UID sent in is the console user
*
* @param uid UID of person to check
* @param error return location for errors
* @returns #TRUE if the UID is the same as the console user and there are no errors
*/
dbus_bool_t
_dbus_is_console_user (dbus_uid_t uid,
DBusError *error)
{
DBusUserDatabase *db;
const DBusUserInfo *info;
dbus_bool_t result = FALSE;
_dbus_user_database_lock_system ();
db = _dbus_user_database_get_system ();
if (db == NULL)
{
dbus_set_error (error, DBUS_ERROR_FAILED, "Could not get system database.");
_dbus_user_database_unlock_system ();
return FALSE;
}
info = _dbus_user_database_lookup (db, uid, NULL, error);
if (info == NULL)
{
_dbus_user_database_unlock_system ();
return FALSE;
}
result = _dbus_user_at_console (info->username, error);
_dbus_user_database_unlock_system ();
return result;
}
/**
* Gets group ID given groupname
*
* @param groupname the groupname
* @param gid return location for GID
* @returns #TRUE if group name existed and we got the GID
*/
dbus_bool_t
_dbus_get_group_id (const DBusString *groupname,
dbus_gid_t *gid)
{
DBusUserDatabase *db;
const DBusGroupInfo *info;
_dbus_user_database_lock_system ();
db = _dbus_user_database_get_system ();
if (db == NULL)
{
_dbus_user_database_unlock_system ();
return FALSE;
}
if (!_dbus_user_database_get_groupname (db, groupname,
&info, NULL))
{
_dbus_user_database_unlock_system ();
return FALSE;
}
*gid = info->gid;
_dbus_user_database_unlock_system ();
return TRUE;
}
/**
* Gets the home directory for the given user.
*
* @param username the username
* @param homedir string to append home directory to
* @returns #TRUE if user existed and we appended their homedir
*/
dbus_bool_t
_dbus_homedir_from_username (const DBusString *username,
DBusString *homedir)
{
DBusUserDatabase *db;
const DBusUserInfo *info;
_dbus_user_database_lock_system ();
db = _dbus_user_database_get_system ();
if (db == NULL)
{
_dbus_user_database_unlock_system ();
return FALSE;
}
if (!_dbus_user_database_get_username (db, username,
&info, NULL))
{
_dbus_user_database_unlock_system ();
return FALSE;
}
if (!_dbus_string_append (homedir, info->homedir))
{
_dbus_user_database_unlock_system ();
return FALSE;
}
_dbus_user_database_unlock_system ();
return TRUE;
}
/**
* Gets a UID from a UID string.
*
* @param uid_str the UID in string form
* @param uid UID to fill in
* @returns #TRUE if successfully filled in UID
*/
dbus_bool_t
_dbus_uid_from_string (const DBusString *uid_str,
dbus_uid_t *uid)
{
int end;
long val;
if (_dbus_string_get_length (uid_str) == 0)
{
_dbus_verbose ("UID string was zero length\n");
return FALSE;
}
val = -1;
end = 0;
if (!_dbus_string_parse_int (uid_str, 0, &val,
&end))
{
_dbus_verbose ("could not parse string as a UID\n");
return FALSE;
}
if (end != _dbus_string_get_length (uid_str))
{
_dbus_verbose ("string contained trailing stuff after UID\n");
return FALSE;
}
*uid = val;
return TRUE;
}
/**
* Gets the credentials corresponding to the given username.
*
* @param username the username
* @param credentials credentials to fill in
* @returns #TRUE if the username existed and we got some credentials
*/
dbus_bool_t
_dbus_credentials_from_username (const DBusString *username,
DBusCredentials *credentials)
{
DBusUserDatabase *db;
const DBusUserInfo *info;
_dbus_user_database_lock_system ();
db = _dbus_user_database_get_system ();
if (db == NULL)
{
_dbus_user_database_unlock_system ();
return FALSE;
}
if (!_dbus_user_database_get_username (db, username,
&info, NULL))
{
_dbus_user_database_unlock_system ();
return FALSE;
}
credentials->pid = DBUS_PID_UNSET;
credentials->uid = info->uid;
credentials->gid = info->primary_gid;
_dbus_user_database_unlock_system ();
return TRUE;
}
/**
* Gets the credentials corresponding to the given UID.
*
* @param uid the UID
* @param credentials credentials to fill in
* @returns #TRUE if the UID existed and we got some credentials
*/
dbus_bool_t
_dbus_credentials_from_uid (dbus_uid_t uid,
DBusCredentials *credentials)
{
DBusUserDatabase *db;
const DBusUserInfo *info;
_dbus_user_database_lock_system ();
db = _dbus_user_database_get_system ();
if (db == NULL)
{
_dbus_user_database_unlock_system ();
return FALSE;
}
if (!_dbus_user_database_get_uid (db, uid,
&info, NULL))
{
_dbus_user_database_unlock_system ();
return FALSE;
}
_dbus_assert (info->uid == uid);
credentials->pid = DBUS_PID_UNSET;
credentials->uid = info->uid;
credentials->gid = info->primary_gid;
_dbus_user_database_unlock_system ();
return TRUE;
}
/**
* Creates a new user database object used to look up and
* cache user information.
* @returns new database, or #NULL on out of memory
*/
DBusUserDatabase*
_dbus_user_database_new (void)
{
DBusUserDatabase *db;
db = dbus_new0 (DBusUserDatabase, 1);
if (db == NULL)
return NULL;
db->refcount = 1;
db->users = _dbus_hash_table_new (DBUS_HASH_ULONG,
NULL, free_user_info);
if (db->users == NULL)
goto failed;
db->groups = _dbus_hash_table_new (DBUS_HASH_ULONG,
NULL, free_group_info);
if (db->groups == NULL)
goto failed;
db->users_by_name = _dbus_hash_table_new (DBUS_HASH_STRING,
NULL, NULL);
if (db->users_by_name == NULL)
goto failed;
db->groups_by_name = _dbus_hash_table_new (DBUS_HASH_STRING,
NULL, NULL);
if (db->groups_by_name == NULL)
goto failed;
return db;
failed:
_dbus_user_database_unref (db);
return NULL;
}
/**
* Increments refcount of user database.
* @param db the database
* @returns the database
*/
DBusUserDatabase *
_dbus_user_database_ref (DBusUserDatabase *db)
{
_dbus_assert (db->refcount > 0);
db->refcount += 1;
return db;
}
/**
* Decrements refcount of user database.
* @param db the database
*/
void
_dbus_user_database_unref (DBusUserDatabase *db)
{
_dbus_assert (db->refcount > 0);
db->refcount -= 1;
if (db->refcount == 0)
{
if (db->users)
_dbus_hash_table_unref (db->users);
if (db->groups)
_dbus_hash_table_unref (db->groups);
if (db->users_by_name)
_dbus_hash_table_unref (db->users_by_name);
if (db->groups_by_name)
_dbus_hash_table_unref (db->groups_by_name);
dbus_free (db);
}
}
/**
* Gets all groups for a particular user. Returns #FALSE
* if no memory, or user isn't known, but always initializes
* group_ids to a NULL array. Sets error to the reason
* for returning #FALSE.
*
* @param db the user database object
* @param uid the user ID
* @param group_ids return location for array of group IDs
* @param n_group_ids return location for length of returned array
* @param error return location for error
* @returns #TRUE on success
*/
dbus_bool_t
_dbus_user_database_get_groups (DBusUserDatabase *db,
dbus_uid_t uid,
dbus_gid_t **group_ids,
int *n_group_ids,
DBusError *error)
{
DBusUserInfo *info;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
*group_ids = NULL;
*n_group_ids = 0;
info = _dbus_user_database_lookup (db, uid, NULL, error);
if (info == NULL)
{
_DBUS_ASSERT_ERROR_IS_SET (error);
return FALSE;
}
if (info->n_group_ids > 0)
{
*group_ids = dbus_new (dbus_gid_t, info->n_group_ids);
if (*group_ids == NULL)
{
dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
return FALSE;
}
*n_group_ids = info->n_group_ids;
memcpy (*group_ids, info->group_ids, info->n_group_ids * sizeof (dbus_gid_t));
}
return TRUE;
}
/**
* Gets the user information for the given UID,
* returned user info should not be freed.
*
* @param db user database
* @param uid the user ID
* @param info return location for const ref to user info
* @param error error location
* @returns #FALSE if error is set
*/
dbus_bool_t
_dbus_user_database_get_uid (DBusUserDatabase *db,
dbus_uid_t uid,
const DBusUserInfo **info,
DBusError *error)
{
*info = _dbus_user_database_lookup (db, uid, NULL, error);
return *info != NULL;
}
/**
* Gets the user information for the given GID,
* returned group info should not be freed.
*
* @param db user database
* @param gid the group ID
* @param info return location for const ref to group info
* @param error error location
* @returns #FALSE if error is set
*/
dbus_bool_t
_dbus_user_database_get_gid (DBusUserDatabase *db,
dbus_gid_t gid,
const DBusGroupInfo **info,
DBusError *error)
{
*info = _dbus_user_database_lookup_group (db, gid, NULL, error);
return *info != NULL;
}
/**
* Gets the user information for the given username.
*
* @param db user database
* @param username the user name
* @param info return location for const ref to user info
* @param error error location
* @returns #FALSE if error is set
*/
dbus_bool_t
_dbus_user_database_get_username (DBusUserDatabase *db,
const DBusString *username,
const DBusUserInfo **info,
DBusError *error)
{
*info = _dbus_user_database_lookup (db, DBUS_UID_UNSET, username, error);
return *info != NULL;
}
/**
* Gets the user information for the given group name,
* returned group info should not be freed.
*
* @param db user database
* @param groupname the group name
* @param info return location for const ref to group info
* @param error error location
* @returns #FALSE if error is set
*/
dbus_bool_t
_dbus_user_database_get_groupname (DBusUserDatabase *db,
const DBusString *groupname,
const DBusGroupInfo **info,
DBusError *error)
{
*info = _dbus_user_database_lookup_group (db, DBUS_GID_UNSET, groupname, error);
return *info != NULL;
}
/** @} */
#ifdef DBUS_BUILD_TESTS
#include <stdio.h>
/**
* Unit test for dbus-userdb.c.
*
* @returns #TRUE on success.
*/
dbus_bool_t
_dbus_userdb_test (const char *test_data_dir)
{
const DBusString *username;
const DBusString *homedir;
if (!_dbus_username_from_current_process (&username))
_dbus_assert_not_reached ("didn't get username");
if (!_dbus_homedir_from_current_process (&homedir))
_dbus_assert_not_reached ("didn't get homedir");
printf (" Current user: %s homedir: %s\n",
_dbus_string_get_const_data (username),
_dbus_string_get_const_data (homedir));
return TRUE;
}
#endif /* DBUS_BUILD_TESTS */
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