26 #include "dbus-sysdeps.h" 
   27 #include "dbus-sysdeps-unix.h" 
   28 #include "dbus-internals.h" 
   29 #include "dbus-list.h" 
   30 #include "dbus-pipe.h" 
   31 #include "dbus-protocol.h" 
   32 #include "dbus-string.h" 
   33 #define DBUS_USERDB_INCLUDES_PRIVATE 1 
   34 #include "dbus-userdb.h" 
   35 #include "dbus-test.h" 
   37 #include <sys/types.h> 
   46 #ifdef HAVE_SYS_RESOURCE_H 
   47 #include <sys/resource.h> 
   50 #include <sys/socket.h> 
   54 #ifdef HAVE_SYS_SYSLIMITS_H 
   55 #include <sys/syslimits.h> 
   59 #include <systemd/sd-daemon.h> 
   89   DBusEnsureStandardFdsFlags flags;
 
   91   _dbus_verbose (
"Becoming a daemon...\n");
 
   93   _dbus_verbose (
"chdir to /\n");
 
   97                       "Could not chdir() to root directory");
 
  101   _dbus_verbose (
"forking...\n");
 
  102   switch ((child_pid = fork ()))
 
  105       _dbus_verbose (
"fork failed\n");
 
  107                       "Failed to fork daemon: %s", _dbus_strerror (errno));
 
  112       _dbus_verbose (
"in child, closing std file descriptors\n");
 
  114       flags = DBUS_FORCE_STDIN_NULL | DBUS_FORCE_STDOUT_NULL;
 
  117       if (s == 
NULL || *s == 
'\0')
 
  118         flags |= DBUS_FORCE_STDERR_NULL;
 
  120         _dbus_verbose (
"keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
 
  124           _dbus_warn (
"%s: %s", s, _dbus_strerror (errno));
 
  131           _dbus_verbose (
"setting umask\n");
 
  135       _dbus_verbose (
"calling setsid()\n");
 
  145           _dbus_verbose (
"pid file or pipe write failed: %s\n",
 
  147           kill (child_pid, SIGTERM);
 
  151       _dbus_verbose (
"parent exiting\n");
 
  169 _dbus_write_pid_file (
const DBusString *filename,
 
  173   const char *cfilename;
 
  177   cfilename = _dbus_string_get_const_data (filename);
 
  179   fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
 
  184                       "Failed to open \"%s\": %s", cfilename,
 
  185                       _dbus_strerror (errno));
 
  189   if ((f = fdopen (fd, 
"w")) == 
NULL)
 
  192                       "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
 
  197   if (fprintf (f, 
"%lu\n", pid) < 0)
 
  200                       "Failed to write to \"%s\": %s", cfilename,
 
  201                       _dbus_strerror (errno));
 
  207   if (fclose (f) == EOF)
 
  210                       "Failed to close \"%s\": %s", cfilename,
 
  211                       _dbus_strerror (errno));
 
  237       _dbus_verbose (
"writing pid file %s\n", _dbus_string_get_const_data (pidfile));
 
  238       if (!_dbus_write_pid_file (pidfile,
 
  242           _dbus_verbose (
"pid file write failed\n");
 
  243           _DBUS_ASSERT_ERROR_IS_SET(error);
 
  249       _dbus_verbose (
"No pid file requested\n");
 
  252   if (print_pid_pipe != 
NULL && _dbus_pipe_is_valid (print_pid_pipe))
 
  257       _dbus_verbose (
"writing our pid to pipe %d\n",
 
  262           _DBUS_SET_OOM (error);
 
  270           _DBUS_SET_OOM (error);
 
  274       bytes = _dbus_string_get_length (&pid);
 
  275       if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
 
  281                               "Printing message bus PID: did not write enough bytes\n");
 
  291       _dbus_verbose (
"No pid pipe to write to\n");
 
  315 #ifndef HAVE_LIBAUDIT 
  336                       "User '%s' does not appear to exist?",
 
  348   if (setgroups (0, 
NULL) < 0)
 
  349     _dbus_warn (
"Failed to drop supplementary groups: %s",
 
  350                 _dbus_strerror (errno));
 
  355   if (setgid (gid) < 0)
 
  358                       "Failed to set GID to %lu: %s", gid,
 
  359                       _dbus_strerror (errno));
 
  363   if (setuid (uid) < 0)
 
  366                       "Failed to set UID to %lu: %s", uid,
 
  367                       _dbus_strerror (errno));
 
  375 #ifdef HAVE_SETRLIMIT 
  386 _dbus_rlimit_save_fd_limit (
DBusError *error)
 
  394       _DBUS_SET_OOM (error);
 
  398   if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
 
  401                       "Failed to get fd limit: %s", _dbus_strerror (errno));
 
  412 #define ENOUGH_FDS 65536 
  415 _dbus_rlimit_raise_fd_limit (
DBusError *error)
 
  417   struct rlimit old, lim;
 
  419   if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
 
  422                       "Failed to get fd limit: %s", _dbus_strerror (errno));
 
  434       if (lim.rlim_cur != RLIM_INFINITY &&
 
  435           lim.rlim_cur < ENOUGH_FDS)
 
  436         lim.rlim_cur = ENOUGH_FDS;
 
  438       if (lim.rlim_max != RLIM_INFINITY &&
 
  439           lim.rlim_max < lim.rlim_cur)
 
  440         lim.rlim_max = lim.rlim_cur;
 
  449   if (lim.rlim_max == RLIM_INFINITY || lim.rlim_cur < lim.rlim_max)
 
  450     lim.rlim_cur = lim.rlim_max;
 
  453   if (lim.rlim_max == old.rlim_max &&
 
  454       lim.rlim_cur == old.rlim_cur)
 
  457   if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
 
  460                       "Failed to set fd limit to %lu: %s",
 
  461                       (
unsigned long) lim.rlim_cur,
 
  462                       _dbus_strerror (errno));
 
  470 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
 
  473   if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
 
  476                       "Failed to restore old fd limit: %s",
 
  477                       _dbus_strerror (errno));
 
  487 fd_limit_not_supported (
DBusError *error)
 
  490                   "cannot change fd limit on this platform");
 
  494 _dbus_rlimit_save_fd_limit (
DBusError *error)
 
  496   fd_limit_not_supported (error);
 
  501 _dbus_rlimit_raise_fd_limit (
DBusError *error)
 
  503   fd_limit_not_supported (error);
 
  508 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
 
  511   fd_limit_not_supported (error);
 
  518 _dbus_rlimit_free (DBusRLimit *lim)
 
  532   struct sigaction act;
 
  535   sigemptyset (&empty_mask);
 
  536   act.sa_handler = handler;
 
  537   act.sa_mask    = empty_mask;
 
  539   sigaction (sig,  &act, 
NULL);
 
  550   return (access (file, F_OK) == 0);
 
  563 #ifdef DBUS_CONSOLE_AUTH_DIR 
  570       _DBUS_SET_OOM (error);
 
  576       _DBUS_SET_OOM (error);
 
  584       _DBUS_SET_OOM (error);
 
  609   if (_dbus_string_get_length (filename) > 0)
 
  610     return _dbus_string_get_byte (filename, 0) == 
'/';
 
  628   const char *filename_c;
 
  631   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
 
  633   filename_c = _dbus_string_get_const_data (filename);
 
  635   if (stat (filename_c, &sb) < 0)
 
  638                       "%s", _dbus_strerror (errno));
 
  642   statbuf->
mode = sb.st_mode;
 
  643   statbuf->
nlink = sb.st_nlink;
 
  644   statbuf->
uid = sb.st_uid;
 
  645   statbuf->
gid = sb.st_gid;
 
  646   statbuf->
size = sb.st_size;
 
  647   statbuf->
atime = sb.st_atime;
 
  648   statbuf->
mtime = sb.st_mtime;
 
  649   statbuf->
ctime = sb.st_ctime;
 
  677   const char *filename_c;
 
  679   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
 
  681   filename_c = _dbus_string_get_const_data (filename);
 
  683   d = opendir (filename_c);
 
  687                       "Failed to read directory \"%s\": %s",
 
  689                       _dbus_strerror (errno));
 
  697                       "Could not allocate memory for directory iterator");
 
  727   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
 
  731   ent = readdir (iter->
d);
 
  740                         "%s", _dbus_strerror (err));
 
  744   else if (ent->d_name[0] == 
'.' &&
 
  745            (ent->d_name[1] == 
'\0' ||
 
  746             (ent->d_name[1] == 
'.' && ent->d_name[2] == 
'\0')))
 
  754                           "No memory to read directory entry");
 
  775 fill_user_info_from_group (
struct group  *g,
 
  781   info->
gid = g->gr_gid;
 
  801   const char *group_c_str;
 
  807     group_c_str = _dbus_string_get_const_data (groupname);
 
  816 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R) 
  826     buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
 
  832     if ((
long) buflen <= 0)
 
  846 #ifdef HAVE_POSIX_GETPWNAM_R 
  848           result = getgrnam_r (group_c_str, &g_str, buf, buflen,
 
  851           result = getgrgid_r (gid, &g_str, buf, buflen,
 
  854         g = getgrnam_r (group_c_str, &g_str, buf, buflen);
 
  860         if (result == ERANGE && buflen < 512 * 1024)
 
  871     if (result == 0 && g == &g_str)
 
  873         b = fill_user_info_from_group (g, info, error);
 
  880                         "Group %s unknown or failed to look it up\n",
 
  881                         group_c_str ? group_c_str : 
"???");
 
  891     g = getgrnam (group_c_str);
 
  895         return fill_user_info_from_group (g, info, error);
 
  900                         "Group %s unknown or failed to look it up\n",
 
  901                         group_c_str ? group_c_str : 
"???");
 
  941   return fill_group_info (info, gid, 
NULL, error);
 
 1060   sep = _dbus_string_get_length (filename);
 
 1064   while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == 
'/')
 
 1078   while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == 
'/')
 
 1084       _dbus_string_get_byte (filename, 0) == 
'/')
 
 1088                                   dirname, _dbus_string_get_length (dirname));
 
 1098   buf = _dbus_string_get_udata (str);
 
 1099   len = _dbus_string_get_length (str);
 
 1101   for (i = 0; i < len; i++)
 
 1103       unsigned char c = (
unsigned char) buf[i];
 
 1106       else if (c < 0x20 || c > 127)
 
 1138       _DBUS_SET_OOM (error);
 
 1144       _DBUS_SET_OOM (error);
 
 1152   fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
 
 1157                       "Failed to open \"%s\": %s",
 
 1158                       _dbus_string_get_const_data (&path),
 
 1159                       _dbus_strerror (errno));
 
 1167                       "Failed to read from \"%s\": %s",
 
 1168                       _dbus_string_get_const_data (&path),
 
 1169                       _dbus_strerror (errno));      
 
 1177   string_squash_nonprintable (&cmdline);  
 
 1186   _DBUS_SET_OOM (error);
 
 1208 ensure_owned_directory (
const char *label,
 
 1213   const char *dir = _dbus_string_get_const_data (
string);
 
 1235   if (stat (dir, &buf) != 0)
 
 1237       int saved_errno = errno;
 
 1240                       "%s \"%s\" not available: %s", label, dir,
 
 1241                       _dbus_strerror (saved_errno));
 
 1245   if (!S_ISDIR (buf.st_mode))
 
 1252   if (buf.st_uid != geteuid ())
 
 1255                       "%s \"%s\" is owned by uid %ld, not our uid %ld",
 
 1256                       label, dir, (
long) buf.st_uid, (
long) geteuid ());
 
 1262   if ((S_IWOTH | S_IWGRP) & buf.st_mode)
 
 1265                       "%s \"%s\" can be written by others (mode 0%o)",
 
 1266                       label, dir, buf.st_mode);
 
 1273 #define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services" 
 1274 #define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services" 
 1287   const char *xdg_runtime_dir;
 
 1296       _DBUS_SET_OOM (error);
 
 1303       _DBUS_SET_OOM (error);
 
 1311       _DBUS_SET_OOM (error);
 
 1318   if (xdg_runtime_dir == 
NULL)
 
 1320       _dbus_verbose (
"XDG_RUNTIME_DIR is unset: transient session services " 
 1321                      "not available here\n");
 
 1332       _DBUS_SET_OOM (error);
 
 1336   if (!ensure_owned_directory (
"XDG_RUNTIME_DIR", &xrd, 
FALSE, error) ||
 
 1337       !ensure_owned_directory (
"XDG_RUNTIME_DIR subdirectory", &dbus1, 
TRUE,
 
 1339       !ensure_owned_directory (
"XDG_RUNTIME_DIR subdirectory", &services,
 
 1346       _DBUS_SET_OOM (error);
 
 1350   _dbus_verbose (
"Transient service directory is %s\n", data);
 
 1383   const char *xdg_data_home;
 
 1384   const char *xdg_data_dirs;
 
 1393   if (xdg_data_home != 
NULL)
 
 1417   if (xdg_data_dirs != 
NULL)
 
 1441                                      DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
 
 1484   static const char standard_search_path[] =
 
 1494                                        DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
 
 1528 #ifdef DBUS_ENABLE_EMBEDDED_TESTS 
 1540 _dbus_test_append_different_uid (
DBusString *uid)
 
 1542   if (geteuid () == 0)
 
 1558 _dbus_test_append_different_username (
DBusString *username)
 
 1560   if (geteuid () == 0)
 
  
dbus_bool_t _dbus_get_session_config_file(DBusString *str)
Get the absolute path of the session.conf file.
dbus_bool_t _dbus_ensure_standard_fds(DBusEnsureStandardFdsFlags flags, const char **error_str_p)
Ensure that the standard file descriptors stdin, stdout and stderr are open, by opening /dev/null if ...
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory.
dbus_bool_t _dbus_set_up_transient_session_servicedirs(DBusList **dirs, DBusError *error)
Returns the standard directories for a session bus to look for transient service activation files.
dbus_bool_t _dbus_get_system_config_file(DBusString *str)
Get the absolute path of the system.conf file (there is no system bus on Windows so this can just ret...
dbus_bool_t _dbus_group_info_fill_gid(DBusGroupInfo *info, dbus_gid_t gid, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group ID.
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init().
dbus_uid_t uid
User owning file.
dbus_bool_t _dbus_get_standard_system_servicedirs(DBusList **dirs)
Returns the standard directories for a system bus to look for service activation files.
dbus_bool_t _dbus_stat(const DBusString *filename, DBusStat *statbuf, DBusError *error)
stat() wrapper.
DBUS_PRIVATE_EXPORT dbus_bool_t _dbus_string_append_int(DBusString *str, long value)
Appends an integer to a DBusString.
const char * _dbus_error_from_errno(int error_number)
Converts a UNIX errno, or Windows errno or WinSock error value into a DBusError name.
dbus_bool_t _dbus_replace_install_prefix(DBusString *path)
Replace the DBUS_PREFIX in the given path, in-place, by the current D-Bus installation directory.
void _dbus_directory_close(DBusDirIter *iter)
Closes a directory iteration.
dbus_bool_t _dbus_string_find_byte_backward(const DBusString *str, int start, unsigned char byte, int *found)
Find the given byte scanning backward from the given start.
Portable struct with stat() results.
dbus_bool_t _dbus_get_user_id_and_primary_group(const DBusString *username, dbus_uid_t *uid_p, dbus_gid_t *gid_p)
Gets user ID and primary group given username.
dbus_bool_t _dbus_string_copy(const DBusString *source, int start, DBusString *dest, int insert_at)
Like _dbus_string_move(), but does not delete the section of the source string that's copied to the d...
dbus_bool_t _dbus_group_info_fill(DBusGroupInfo *info, const DBusString *groupname, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group name.
unsigned long ctime
Creation time.
Information about a UNIX group.
dbus_bool_t _dbus_path_is_absolute(const DBusString *filename)
Checks whether the filename is an absolute path.
unsigned long dbus_gid_t
A group ID.
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
dbus_bool_t _dbus_groups_from_uid(dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids)
Gets all groups corresponding to the given UID.
dbus_bool_t _dbus_unix_user_is_process_owner(dbus_uid_t uid)
Checks to see if the UNIX user ID matches the UID of the process.
dbus_bool_t _dbus_string_get_dirname(const DBusString *filename, DBusString *dirname)
Get the directory name from a complete filename.
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
dbus_bool_t _dbus_user_at_console(const char *username, DBusError *error)
Checks if user is at the console.
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more.
dbus_bool_t _dbus_change_to_daemon_user(const char *user, DBusError *error)
Changes the user and group the bus is running as.
unsigned long atime
Access time.
int _dbus_read(int fd, DBusString *buffer, int count)
Thin wrapper around the read() system call that appends the data it reads to the DBusString buffer.
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
dbus_bool_t _dbus_verify_daemon_user(const char *user)
Verify that after the fork we can successfully change to this user.
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
DIR * d
The DIR* from opendir()
unsigned long mode
File mode.
dbus_bool_t _dbus_string_append_printf(DBusString *str, const char *format,...)
Appends a printf-style formatted string to the DBusString.
dbus_bool_t _dbus_get_group_id(const DBusString *groupname, dbus_gid_t *gid)
Gets group ID given groupname.
dbus_bool_t _dbus_unix_user_is_at_console(dbus_uid_t uid, DBusError *error)
Checks to see if the UNIX user ID is at the console.
unsigned long dbus_pid_t
A process ID.
dbus_bool_t _dbus_split_paths_and_append(DBusString *dirs, const char *suffix, DBusList **dir_list)
Split paths into a list of char strings.
unsigned long dbus_uid_t
A user ID.
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
unsigned long nlink
Number of hard links.
dbus_bool_t _dbus_parse_unix_group_from_config(const DBusString *groupname, dbus_gid_t *gid_p)
Parse a UNIX group from the bus config file.
dbus_bool_t _dbus_is_console_user(dbus_uid_t uid, DBusError *error)
Checks to see if the UID sent in is the console user.
dbus_bool_t _dbus_directory_get_next_file(DBusDirIter *iter, DBusString *filename, DBusError *error)
Get next file in the directory.
dbus_bool_t _dbus_file_exists(const char *file)
Checks if a file exists.
dbus_bool_t dbus_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).
#define _dbus_assert_not_reached(explanation)
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
unsigned long mtime
Modify time.
dbus_gid_t gid
Group owning file.
dbus_bool_t _dbus_command_for_pid(unsigned long pid, DBusString *str, int max_len, DBusError *error)
Get a printable string describing the command used to execute the process with pid.
#define _dbus_assert(condition)
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor.
dbus_bool_t _dbus_get_standard_session_servicedirs(DBusList **dirs)
Returns the standard directories for a session bus to look for service activation files.
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID.
char * _dbus_strdup(const char *str)
Duplicates a string.
void _dbus_set_signal_handler(int sig, DBusSignalHandler handler)
Installs a UNIX signal handler.
dbus_bool_t _dbus_unix_groups_from_uid(dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids)
Gets all groups corresponding to the given UNIX user ID.
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
void(* DBusSignalHandler)(int sig)
A UNIX signal handler.
Object representing an exception.
DBusDirIter * _dbus_directory_open(const DBusString *filename, DBusError *error)
Open a directory to iterate over.
dbus_bool_t _dbus_ensure_directory(const DBusString *filename, DBusError *error)
Creates a directory; succeeds if the directory is created or already existed.
dbus_bool_t _dbus_become_daemon(const DBusString *pidfile, DBusPipe *print_pid_pipe, DBusError *error, dbus_bool_t keep_umask)
Does the chdir, fork, setsid, etc.
void dbus_set_error(DBusError *error, const char *name, const char *format,...)
Assigns an error name and message to a DBusError.
dbus_bool_t _dbus_string_steal_data(DBusString *str, char **data_return)
Like _dbus_string_get_data(), but removes the gotten data from the original string.
dbus_bool_t _dbus_parse_unix_user_from_config(const DBusString *username, dbus_uid_t *uid_p)
Parse a UNIX user from the bus config file.
const char * message
public error message field
Internals of directory iterator.
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field
dbus_bool_t _dbus_get_user_id(const DBusString *username, dbus_uid_t *uid)
Gets user ID given username.
dbus_bool_t _dbus_write_pid_to_file_and_pipe(const DBusString *pidfile, DBusPipe *print_pid_pipe, dbus_pid_t pid_to_write, DBusError *error)
Writes the given pid_to_write to a pidfile (if non-NULL) and/or to a pipe (if non-NULL).
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string.
dbus_bool_t _dbus_string_copy_len(const DBusString *source, int start, int len, DBusString *dest, int insert_at)
Like _dbus_string_copy(), but can copy a segment from the middle of the source string.
#define dbus_new0(type, count)
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX).
dbus_bool_t _dbus_homedir_from_current_process(const DBusString **homedir)
Gets homedir of user owning current process.
dbus_bool_t _dbus_string_append(DBusString *str, const char *buffer)
Appends a nul-terminated C-style string to a DBusString.
char * groupname
Group name.
dbus_bool_t _dbus_windows_user_is_process_owner(const char *windows_sid)
Checks to see if the Windows user SID matches the owner of the process.
unsigned long size
Size of file.
dbus_uint32_t dbus_bool_t