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));
   410 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int  desired,
   427   if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
   430                       "Failed to get fd limit: %s", _dbus_strerror (errno));
   434   if (lim.rlim_cur == RLIM_INFINITY || lim.rlim_cur >= desired)
   443   lim.rlim_cur = lim.rlim_max = desired;
   445   if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
   448                       "Failed to set fd limit to %u: %s",
   449                       desired, _dbus_strerror (errno));
   457 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
   460   if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
   463                       "Failed to restore old fd limit: %s",
   464                       _dbus_strerror (errno));
   474 fd_limit_not_supported (
DBusError *error)
   477                   "cannot change fd limit on this platform");
   481 _dbus_rlimit_save_fd_limit (
DBusError *error)
   483   fd_limit_not_supported (error);
   488 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int  desired,
   491   fd_limit_not_supported (error);
   496 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
   499   fd_limit_not_supported (error);
   506 _dbus_rlimit_free (DBusRLimit *lim)
   520   struct sigaction act;
   523   sigemptyset (&empty_mask);
   524   act.sa_handler = handler;
   525   act.sa_mask    = empty_mask;
   527   sigaction (sig,  &act, 
NULL);
   538   return (access (file, F_OK) == 0);
   551 #ifdef DBUS_CONSOLE_AUTH_DIR   558       _DBUS_SET_OOM (error);
   564       _DBUS_SET_OOM (error);
   572       _DBUS_SET_OOM (error);
   597   if (_dbus_string_get_length (filename) > 0)
   598     return _dbus_string_get_byte (filename, 0) == 
'/';
   616   const char *filename_c;
   619   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
   621   filename_c = _dbus_string_get_const_data (filename);
   623   if (stat (filename_c, &sb) < 0)
   626                       "%s", _dbus_strerror (errno));
   630   statbuf->
mode = sb.st_mode;
   631   statbuf->
nlink = sb.st_nlink;
   632   statbuf->
uid = sb.st_uid;
   633   statbuf->
gid = sb.st_gid;
   634   statbuf->
size = sb.st_size;
   635   statbuf->
atime = sb.st_atime;
   636   statbuf->
mtime = sb.st_mtime;
   637   statbuf->
ctime = sb.st_ctime;
   665   const char *filename_c;
   667   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
   669   filename_c = _dbus_string_get_const_data (filename);
   671   d = opendir (filename_c);
   675                       "Failed to read directory \"%s\": %s",
   677                       _dbus_strerror (errno));
   685                       "Could not allocate memory for directory iterator");
   715   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
   719   ent = readdir (iter->
d);
   728                         "%s", _dbus_strerror (err));
   732   else if (ent->d_name[0] == 
'.' &&
   733            (ent->d_name[1] == 
'\0' ||
   734             (ent->d_name[1] == 
'.' && ent->d_name[2] == 
'\0')))
   742                           "No memory to read directory entry");
   763 fill_user_info_from_group (
struct group  *g,
   769   info->
gid = g->gr_gid;
   789   const char *group_c_str;
   795     group_c_str = _dbus_string_get_const_data (groupname);
   804 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)   814     buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
   820     if ((
long) buflen <= 0)
   834 #ifdef HAVE_POSIX_GETPWNAM_R   836           result = getgrnam_r (group_c_str, &g_str, buf, buflen,
   839           result = getgrgid_r (gid, &g_str, buf, buflen,
   842         g = getgrnam_r (group_c_str, &g_str, buf, buflen);
   848         if (result == ERANGE && buflen < 512 * 1024)
   859     if (result == 0 && g == &g_str)
   861         b = fill_user_info_from_group (g, info, error);
   868                         "Group %s unknown or failed to look it up\n",
   869                         group_c_str ? group_c_str : 
"???");
   879     g = getgrnam (group_c_str);
   883         return fill_user_info_from_group (g, info, error);
   888                         "Group %s unknown or failed to look it up\n",
   889                         group_c_str ? group_c_str : 
"???");
   929   return fill_group_info (info, gid, 
NULL, error);
  1048   sep = _dbus_string_get_length (filename);
  1052   while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == 
'/')
  1066   while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == 
'/')
  1072       _dbus_string_get_byte (filename, 0) == 
'/')
  1076                                   dirname, _dbus_string_get_length (dirname));
  1086   buf = _dbus_string_get_udata (str);
  1087   len = _dbus_string_get_length (str);
  1089   for (i = 0; i < len; i++)
  1091       unsigned char c = (
unsigned char) buf[i];
  1094       else if (c < 0x20 || c > 127)
  1126       _DBUS_SET_OOM (error);
  1132       _DBUS_SET_OOM (error);
  1140   fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
  1145                       "Failed to open \"%s\": %s",
  1146                       _dbus_string_get_const_data (&path),
  1147                       _dbus_strerror (errno));
  1155                       "Failed to read from \"%s\": %s",
  1156                       _dbus_string_get_const_data (&path),
  1157                       _dbus_strerror (errno));      
  1165   string_squash_nonprintable (&cmdline);  
  1174   _DBUS_SET_OOM (error);
  1196 ensure_owned_directory (
const char *label,
  1201   const char *dir = _dbus_string_get_const_data (
string);
  1223   if (stat (dir, &buf) != 0)
  1225       int saved_errno = errno;
  1228                       "%s \"%s\" not available: %s", label, dir,
  1229                       _dbus_strerror (saved_errno));
  1233   if (!S_ISDIR (buf.st_mode))
  1240   if (buf.st_uid != geteuid ())
  1243                       "%s \"%s\" is owned by uid %ld, not our uid %ld",
  1244                       label, dir, (
long) buf.st_uid, (
long) geteuid ());
  1250   if ((S_IWOTH | S_IWGRP) & buf.st_mode)
  1253                       "%s \"%s\" can be written by others (mode 0%o)",
  1254                       label, dir, buf.st_mode);
  1261 #define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services"  1262 #define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services"  1275   const char *xdg_runtime_dir;
  1284       _DBUS_SET_OOM (error);
  1291       _DBUS_SET_OOM (error);
  1299       _DBUS_SET_OOM (error);
  1306   if (xdg_runtime_dir == 
NULL)
  1308       _dbus_verbose (
"XDG_RUNTIME_DIR is unset: transient session services "  1309                      "not available here\n");
  1320       _DBUS_SET_OOM (error);
  1324   if (!ensure_owned_directory (
"XDG_RUNTIME_DIR", &xrd, 
FALSE, error) ||
  1325       !ensure_owned_directory (
"XDG_RUNTIME_DIR subdirectory", &dbus1, 
TRUE,
  1327       !ensure_owned_directory (
"XDG_RUNTIME_DIR subdirectory", &services,
  1334       _DBUS_SET_OOM (error);
  1338   _dbus_verbose (
"Transient service directory is %s\n", data);
  1371   const char *xdg_data_home;
  1372   const char *xdg_data_dirs;
  1381   if (xdg_data_home != 
NULL)
  1405   if (xdg_data_dirs != 
NULL)
  1429                                      DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
  1472   static const char standard_search_path[] =
  1482                                        DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
 dbus_bool_t _dbus_string_append(DBusString *str, const char *buffer)
Appends a nul-terminated C-style string to a DBusString. 
dbus_bool_t _dbus_split_paths_and_append(DBusString *dirs, const char *suffix, DBusList **dir_list)
Split paths into a list of char strings. 
const char * message
public error message field 
#define NULL
A null pointer, defined appropriately for C or C++. 
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. 
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. 
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...
dbus_bool_t _dbus_string_get_dirname(const DBusString *filename, DBusString *dirname)
Get the directory name from a complete filename. 
dbus_bool_t _dbus_ensure_directory(const DBusString *filename, DBusError *error)
Creates a directory; succeeds if the directory is created or already existed. 
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0(). 
dbus_bool_t _dbus_path_is_absolute(const DBusString *filename)
Checks whether the filename is an absolute path. 
Portable struct with stat() results. 
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 ...
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX). 
DBUS_PRIVATE_EXPORT dbus_bool_t _dbus_string_append_int(DBusString *str, long value)
Appends an integer to a DBusString. 
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_parse_unix_group_from_config(const DBusString *groupname, dbus_gid_t *gid_p)
Parse a UNIX group from the bus config file. 
void _dbus_directory_close(DBusDirIter *iter)
Closes a directory iteration. 
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. 
#define _dbus_assert(condition)
Aborts with an error message if the condition is false. 
dbus_bool_t _dbus_directory_get_next_file(DBusDirIter *iter, DBusString *filename, DBusError *error)
Get next file in the directory. 
unsigned long atime
Access time. 
dbus_bool_t _dbus_get_standard_session_servicedirs(DBusList **dirs)
Returns the standard directories for a session bus to look for service activation files...
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory. 
DBusDirIter * _dbus_directory_open(const DBusString *filename, DBusError *error)
Open a directory to iterate over. 
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string. 
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. 
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_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...
char * groupname
Group name. 
const char * _dbus_error_from_errno(int error_number)
Converts a UNIX errno, or Windows errno or WinSock error value into a DBusError name. 
Internals of directory iterator. 
unsigned long mode
File mode. 
unsigned long dbus_pid_t
A process ID. 
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_change_to_daemon_user(const char *user, DBusError *error)
Changes the user and group the bus is running as. 
DIR * d
The DIR* from opendir() 
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc(). 
dbus_gid_t gid
Group owning file. 
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0(). 
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE. 
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string. 
dbus_bool_t _dbus_get_session_config_file(DBusString *str)
Get the absolute path of the session.conf file. 
void _dbus_warn(const char *format,...)
Prints a warning message to stderr. 
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list. 
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...
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_group_info_fill(DBusGroupInfo *info, const DBusString *groupname, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group name...
dbus_bool_t _dbus_get_group_id(const DBusString *groupname, dbus_gid_t *gid)
Gets group ID given groupname. 
Object representing an exception. 
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_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. 
unsigned long ctime
Creation time. 
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init(). 
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field 
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID. 
dbus_bool_t _dbus_file_exists(const char *file)
Checks if a file exists. 
#define TRUE
Expands to "1". 
unsigned long nlink
Number of hard links. 
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called. 
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). 
dbus_uid_t uid
User owning file. 
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more. 
dbus_bool_t _dbus_verify_daemon_user(const char *user)
Verify that after the fork we can successfully change to this user. 
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. 
dbus_bool_t _dbus_homedir_from_current_process(const DBusString **homedir)
Gets homedir of user owning current process. 
Information about a UNIX group. 
dbus_bool_t _dbus_stat(const DBusString *filename, DBusStat *statbuf, DBusError *error)
stat() wrapper. 
dbus_bool_t _dbus_get_user_id(const DBusString *username, dbus_uid_t *uid)
Gets user ID given username. 
void _dbus_set_signal_handler(int sig, DBusSignalHandler handler)
Installs a UNIX signal handler. 
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_replace_install_prefix(DBusString *path)
Replace the DBUS_PREFIX in the given path, in-place, by the current D-Bus installation directory...
dbus_bool_t _dbus_user_at_console(const char *username, DBusError *error)
Checks if user is at the console. 
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. 
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...
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation. 
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor. 
#define FALSE
Expands to "0". 
unsigned long mtime
Modify time. 
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a 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. 
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. 
void(* DBusSignalHandler)(int sig)
A UNIX signal handler. 
unsigned long dbus_gid_t
A group ID. 
unsigned long size
Size of file. 
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. 
char * _dbus_strdup(const char *str)
Duplicates a string. 
const char * _dbus_getenv(const char *varname)
Wrapper for getenv(). 
unsigned long dbus_uid_t
A user ID. 
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_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).