26 #include "dbus-sysdeps.h" 27 #include "dbus-sysdeps-unix.h" 28 #include "dbus-internals.h" 29 #include "dbus-pipe.h" 30 #include "dbus-protocol.h" 31 #include "dbus-string.h" 32 #define DBUS_USERDB_INCLUDES_PRIVATE 1 33 #include "dbus-userdb.h" 34 #include "dbus-test.h" 36 #include <sys/types.h> 45 #ifdef HAVE_SYS_RESOURCE_H 46 #include <sys/resource.h> 49 #include <sys/socket.h> 53 #ifdef HAVE_SYS_SYSLIMITS_H 54 #include <sys/syslimits.h> 58 #include <systemd/sd-daemon.h> 88 DBusEnsureStandardFdsFlags flags;
90 _dbus_verbose (
"Becoming a daemon...\n");
92 _dbus_verbose (
"chdir to /\n");
96 "Could not chdir() to root directory");
100 _dbus_verbose (
"forking...\n");
101 switch ((child_pid = fork ()))
104 _dbus_verbose (
"fork failed\n");
106 "Failed to fork daemon: %s", _dbus_strerror (errno));
111 _dbus_verbose (
"in child, closing std file descriptors\n");
113 flags = DBUS_FORCE_STDIN_NULL | DBUS_FORCE_STDOUT_NULL;
116 if (s ==
NULL || *s ==
'\0')
117 flags |= DBUS_FORCE_STDERR_NULL;
119 _dbus_verbose (
"keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
123 _dbus_warn (
"%s: %s", s, _dbus_strerror (errno));
130 _dbus_verbose (
"setting umask\n");
134 _dbus_verbose (
"calling setsid()\n");
144 _dbus_verbose (
"pid file or pipe write failed: %s\n",
146 kill (child_pid, SIGTERM);
150 _dbus_verbose (
"parent exiting\n");
168 _dbus_write_pid_file (
const DBusString *filename,
172 const char *cfilename;
176 cfilename = _dbus_string_get_const_data (filename);
178 fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
183 "Failed to open \"%s\": %s", cfilename,
184 _dbus_strerror (errno));
188 if ((f = fdopen (fd,
"w")) ==
NULL)
191 "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
196 if (fprintf (f,
"%lu\n", pid) < 0)
199 "Failed to write to \"%s\": %s", cfilename,
200 _dbus_strerror (errno));
206 if (fclose (f) == EOF)
209 "Failed to close \"%s\": %s", cfilename,
210 _dbus_strerror (errno));
236 _dbus_verbose (
"writing pid file %s\n", _dbus_string_get_const_data (pidfile));
237 if (!_dbus_write_pid_file (pidfile,
241 _dbus_verbose (
"pid file write failed\n");
242 _DBUS_ASSERT_ERROR_IS_SET(error);
248 _dbus_verbose (
"No pid file requested\n");
251 if (print_pid_pipe !=
NULL && _dbus_pipe_is_valid (print_pid_pipe))
256 _dbus_verbose (
"writing our pid to pipe %d\n",
261 _DBUS_SET_OOM (error);
269 _DBUS_SET_OOM (error);
273 bytes = _dbus_string_get_length (&pid);
274 if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
280 "Printing message bus PID: did not write enough bytes\n");
290 _dbus_verbose (
"No pid pipe to write to\n");
314 #ifndef HAVE_LIBAUDIT 335 "User '%s' does not appear to exist?",
347 if (setgroups (0,
NULL) < 0)
348 _dbus_warn (
"Failed to drop supplementary groups: %s",
349 _dbus_strerror (errno));
354 if (setgid (gid) < 0)
357 "Failed to set GID to %lu: %s", gid,
358 _dbus_strerror (errno));
362 if (setuid (uid) < 0)
365 "Failed to set UID to %lu: %s", uid,
366 _dbus_strerror (errno));
374 #ifdef HAVE_SETRLIMIT 385 _dbus_rlimit_save_fd_limit (
DBusError *error)
393 _DBUS_SET_OOM (error);
397 if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
400 "Failed to get fd limit: %s", _dbus_strerror (errno));
409 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int desired,
426 if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
429 "Failed to get fd limit: %s", _dbus_strerror (errno));
433 if (lim.rlim_cur == RLIM_INFINITY || lim.rlim_cur >= desired)
442 lim.rlim_cur = lim.rlim_max = desired;
444 if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
447 "Failed to set fd limit to %u: %s",
448 desired, _dbus_strerror (errno));
456 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
459 if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
462 "Failed to restore old fd limit: %s",
463 _dbus_strerror (errno));
473 fd_limit_not_supported (
DBusError *error)
476 "cannot change fd limit on this platform");
480 _dbus_rlimit_save_fd_limit (
DBusError *error)
482 fd_limit_not_supported (error);
487 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int desired,
490 fd_limit_not_supported (error);
495 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
498 fd_limit_not_supported (error);
505 _dbus_rlimit_free (DBusRLimit *lim)
519 struct sigaction act;
522 sigemptyset (&empty_mask);
523 act.sa_handler = handler;
524 act.sa_mask = empty_mask;
526 sigaction (sig, &act,
NULL);
537 return (access (file, F_OK) == 0);
557 _DBUS_SET_OOM (error);
563 _DBUS_SET_OOM (error);
571 _DBUS_SET_OOM (error);
593 if (_dbus_string_get_length (filename) > 0)
594 return _dbus_string_get_byte (filename, 0) ==
'/';
612 const char *filename_c;
615 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
617 filename_c = _dbus_string_get_const_data (filename);
619 if (stat (filename_c, &sb) < 0)
622 "%s", _dbus_strerror (errno));
626 statbuf->
mode = sb.st_mode;
627 statbuf->
nlink = sb.st_nlink;
628 statbuf->
uid = sb.st_uid;
629 statbuf->
gid = sb.st_gid;
630 statbuf->
size = sb.st_size;
631 statbuf->
atime = sb.st_atime;
632 statbuf->
mtime = sb.st_mtime;
633 statbuf->
ctime = sb.st_ctime;
661 const char *filename_c;
663 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
665 filename_c = _dbus_string_get_const_data (filename);
667 d = opendir (filename_c);
671 "Failed to read directory \"%s\": %s",
673 _dbus_strerror (errno));
681 "Could not allocate memory for directory iterator");
711 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
715 ent = readdir (iter->
d);
724 "%s", _dbus_strerror (err));
728 else if (ent->d_name[0] ==
'.' &&
729 (ent->d_name[1] ==
'\0' ||
730 (ent->d_name[1] ==
'.' && ent->d_name[2] ==
'\0')))
738 "No memory to read directory entry");
759 fill_user_info_from_group (
struct group *g,
765 info->
gid = g->gr_gid;
785 const char *group_c_str;
791 group_c_str = _dbus_string_get_const_data (groupname);
800 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R) 810 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
816 if ((
long) buflen <= 0)
830 #ifdef HAVE_POSIX_GETPWNAM_R 832 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
835 result = getgrgid_r (gid, &g_str, buf, buflen,
838 g = getgrnam_r (group_c_str, &g_str, buf, buflen);
844 if (result == ERANGE && buflen < 512 * 1024)
855 if (result == 0 && g == &g_str)
857 b = fill_user_info_from_group (g, info, error);
864 "Group %s unknown or failed to look it up\n",
865 group_c_str ? group_c_str :
"???");
875 g = getgrnam (group_c_str);
879 return fill_user_info_from_group (g, info, error);
884 "Group %s unknown or failed to look it up\n",
885 group_c_str ? group_c_str :
"???");
925 return fill_group_info (info, gid,
NULL, error);
1044 sep = _dbus_string_get_length (filename);
1048 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) ==
'/')
1062 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) ==
'/')
1068 _dbus_string_get_byte (filename, 0) ==
'/')
1072 dirname, _dbus_string_get_length (dirname));
1082 buf = _dbus_string_get_udata (str);
1083 len = _dbus_string_get_length (str);
1085 for (i = 0; i < len; i++)
1087 unsigned char c = (
unsigned char) buf[i];
1090 else if (c < 0x20 || c > 127)
1122 _DBUS_SET_OOM (error);
1128 _DBUS_SET_OOM (error);
1136 fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
1141 "Failed to open \"%s\": %s",
1142 _dbus_string_get_const_data (&path),
1143 _dbus_strerror (errno));
1151 "Failed to read from \"%s\": %s",
1152 _dbus_string_get_const_data (&path),
1153 _dbus_strerror (errno));
1161 string_squash_nonprintable (&cmdline);
1170 _DBUS_SET_OOM (error);
1191 #define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services" 1192 #define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services" 1214 const char *xdg_data_home;
1215 const char *xdg_data_dirs;
1224 if (xdg_data_home !=
NULL)
1248 if (xdg_data_dirs !=
NULL)
1272 DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
1315 static const char standard_search_path[] =
1325 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.
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.
void(* DBusSignalHandler)(int sig)
A UNIX signal handler.
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.
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.
#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.
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).