--- /dev/null
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* dbus-sysdeps-util-unix.c Would be in dbus-sysdeps-unix.c, but not used in libdbus
+ *
+ * Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
+ * Copyright (C) 2003 CodeFactory AB
+ *
+ * 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-sysdeps.h"
+#include "dbus-sysdeps-unix.h"
+#include "dbus-internals.h"
+#include "dbus-protocol.h"
+#include "dbus-string.h"
+#define DBUS_USERDB_INCLUDES_PRIVATE 1
+#include "dbus-userdb.h"
+#include "dbus-test.h"
+
+#include <sys/types.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <grp.h>
+#include <sys/socket.h>
+#include <dirent.h>
+#include <sys/un.h>
+#include <syslog.h>
+#ifdef HAVE_LIBAUDIT
+#include <sys/prctl.h>
+#include <sys/capability.h>
+#include <libaudit.h>
+#endif /* HAVE_LIBAUDIT */
+
+#ifdef HAVE_SYS_SYSLIMITS_H
+#include <sys/syslimits.h>
+#endif
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+/**
+ * @addtogroup DBusInternalsUtils
+ * @{
+ */
+
+
+/**
+ * Does the chdir, fork, setsid, etc. to become a daemon process.
+ *
+ * @param pidfile #NULL, or pidfile to create
+ * @param print_pid_pipe pipe to print daemon's pid to, or -1 for none
+ * @param error return location for errors
+ * @param keep_umask #TRUE to keep the original umask
+ * @returns #FALSE on failure
+ */
+dbus_bool_t
+_dbus_become_daemon (const DBusString *pidfile,
+ DBusPipe *print_pid_pipe,
+ DBusError *error,
+ dbus_bool_t keep_umask)
+{
+ const char *s;
+ pid_t child_pid;
+ int dev_null_fd;
+
+ _dbus_verbose ("Becoming a daemon...\n");
+
+ _dbus_verbose ("chdir to /\n");
+ if (chdir ("/") < 0)
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "Could not chdir() to root directory");
+ return FALSE;
+ }
+
+ _dbus_verbose ("forking...\n");
+ switch ((child_pid = fork ()))
+ {
+ case -1:
+ _dbus_verbose ("fork failed\n");
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to fork daemon: %s", _dbus_strerror (errno));
+ return FALSE;
+ break;
+
+ case 0:
+ _dbus_verbose ("in child, closing std file descriptors\n");
+
+ /* silently ignore failures here, if someone
+ * doesn't have /dev/null we may as well try
+ * to continue anyhow
+ */
+
+ dev_null_fd = open ("/dev/null", O_RDWR);
+ if (dev_null_fd >= 0)
+ {
+ dup2 (dev_null_fd, 0);
+ dup2 (dev_null_fd, 1);
+
+ s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
+ if (s == NULL || *s == '\0')
+ dup2 (dev_null_fd, 2);
+ else
+ _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
+ }
+
+ if (!keep_umask)
+ {
+ /* Get a predictable umask */
+ _dbus_verbose ("setting umask\n");
+ umask (022);
+ }
+
+ _dbus_verbose ("calling setsid()\n");
+ if (setsid () == -1)
+ _dbus_assert_not_reached ("setsid() failed");
+
+ break;
+
+ default:
+ if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
+ child_pid, error))
+ {
+ _dbus_verbose ("pid file or pipe write failed: %s\n",
+ error->message);
+ kill (child_pid, SIGTERM);
+ return FALSE;
+ }
+
+ _dbus_verbose ("parent exiting\n");
+ _exit (0);
+ break;
+ }
+
+ return TRUE;
+}
+
+
+/**
+ * Creates a file containing the process ID.
+ *
+ * @param filename the filename to write to
+ * @param pid our process ID
+ * @param error return location for errors
+ * @returns #FALSE on failure
+ */
+static dbus_bool_t
+_dbus_write_pid_file (const DBusString *filename,
+ unsigned long pid,
+ DBusError *error)
+{
+ const char *cfilename;
+ int fd;
+ FILE *f;
+
+ cfilename = _dbus_string_get_const_data (filename);
+
+ fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
+
+ if (fd < 0)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to open \"%s\": %s", cfilename,
+ _dbus_strerror (errno));
+ return FALSE;
+ }
+
+ if ((f = fdopen (fd, "w")) == NULL)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
+ _dbus_close (fd, NULL);
+ return FALSE;
+ }
+
+ if (fprintf (f, "%lu\n", pid) < 0)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to write to \"%s\": %s", cfilename,
+ _dbus_strerror (errno));
+
+ fclose (f);
+ return FALSE;
+ }
+
+ if (fclose (f) == EOF)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to close \"%s\": %s", cfilename,
+ _dbus_strerror (errno));
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/**
+ * Writes the given pid_to_write to a pidfile (if non-NULL) and/or to a
+ * pipe (if non-NULL). Does nothing if pidfile and print_pid_pipe are both
+ * NULL.
+ *
+ * @param pidfile the file to write to or #NULL
+ * @param print_pid_pipe the pipe to write to or #NULL
+ * @param pid_to_write the pid to write out
+ * @param error error on failure
+ * @returns FALSE if error is set
+ */
+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)
+{
+ if (pidfile)
+ {
+ _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
+ if (!_dbus_write_pid_file (pidfile,
+ pid_to_write,
+ error))
+ {
+ _dbus_verbose ("pid file write failed\n");
+ _DBUS_ASSERT_ERROR_IS_SET(error);
+ return FALSE;
+ }
+ }
+ else
+ {
+ _dbus_verbose ("No pid file requested\n");
+ }
+
+ if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
+ {
+ DBusString pid;
+ int bytes;
+
+ _dbus_verbose ("writing our pid to pipe %d\n", print_pid_pipe->fd_or_handle);
+
+ if (!_dbus_string_init (&pid))
+ {
+ _DBUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ if (!_dbus_string_append_int (&pid, pid_to_write) ||
+ !_dbus_string_append (&pid, "\n"))
+ {
+ _dbus_string_free (&pid);
+ _DBUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ bytes = _dbus_string_get_length (&pid);
+ if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
+ {
+ /* _dbus_pipe_write sets error only on failure, not short write */
+ if (error != NULL && !dbus_error_is_set(error))
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "Printing message bus PID: did not write enough bytes\n");
+ }
+ _dbus_string_free (&pid);
+ return FALSE;
+ }
+
+ _dbus_string_free (&pid);
+ }
+ else
+ {
+ _dbus_verbose ("No pid pipe to write to\n");
+ }
+
+ return TRUE;
+}
+
+/**
+ * Verify that after the fork we can successfully change to this user.
+ *
+ * @param user the username given in the daemon configuration
+ * @returns #TRUE if username is valid
+ */
+dbus_bool_t
+_dbus_verify_daemon_user (const char *user)
+{
+ DBusString u;
+
+ _dbus_string_init_const (&u, user);
+
+ return _dbus_get_user_id_and_primary_group (&u, NULL, NULL);
+}
+
+/**
+ * Changes the user and group the bus is running as.
+ *
+ * @param user the user to become
+ * @param error return location for errors
+ * @returns #FALSE on failure
+ */
+dbus_bool_t
+_dbus_change_to_daemon_user (const char *user,
+ DBusError *error)
+{
+ dbus_uid_t uid;
+ dbus_gid_t gid;
+ DBusString u;
+#ifdef HAVE_LIBAUDIT
+ dbus_bool_t we_were_root;
+ cap_t new_caps;
+#endif
+
+ _dbus_string_init_const (&u, user);
+
+ if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "User '%s' does not appear to exist?",
+ user);
+ return FALSE;
+ }
+
+#ifdef HAVE_LIBAUDIT
+ we_were_root = _dbus_geteuid () == 0;
+ new_caps = NULL;
+ /* have a tmp set of caps that we use to transition to the usr/grp dbus should
+ * run as ... doesn't really help. But keeps people happy.
+ */
+
+ if (we_were_root)
+ {
+ cap_value_t new_cap_list[] = { CAP_AUDIT_WRITE };
+ cap_value_t tmp_cap_list[] = { CAP_AUDIT_WRITE, CAP_SETUID, CAP_SETGID };
+ cap_t tmp_caps = cap_init();
+
+ if (!tmp_caps || !(new_caps = cap_init ()))
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "Failed to initialize drop of capabilities: %s\n",
+ _dbus_strerror (errno));
+
+ if (tmp_caps)
+ cap_free (tmp_caps);
+
+ return FALSE;
+ }
+
+ /* assume these work... */
+ cap_set_flag (new_caps, CAP_PERMITTED, 1, new_cap_list, CAP_SET);
+ cap_set_flag (new_caps, CAP_EFFECTIVE, 1, new_cap_list, CAP_SET);
+ cap_set_flag (tmp_caps, CAP_PERMITTED, 3, tmp_cap_list, CAP_SET);
+ cap_set_flag (tmp_caps, CAP_EFFECTIVE, 3, tmp_cap_list, CAP_SET);
+
+ if (prctl (PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to set keep-capabilities: %s\n",
+ _dbus_strerror (errno));
+ cap_free (tmp_caps);
+ goto fail;
+ }
+
+ if (cap_set_proc (tmp_caps) == -1)
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "Failed to drop capabilities: %s\n",
+ _dbus_strerror (errno));
+ cap_free (tmp_caps);
+ goto fail;
+ }
+ cap_free (tmp_caps);
+ }
+#endif /* HAVE_LIBAUDIT */
+
+ /* setgroups() only works if we are a privileged process,
+ * so we don't return error on failure; the only possible
+ * failure is that we don't have perms to do it.
+ *
+ * not sure this is right, maybe if setuid()
+ * is going to work then setgroups() should also work.
+ */
+ if (setgroups (0, NULL) < 0)
+ _dbus_warn ("Failed to drop supplementary groups: %s\n",
+ _dbus_strerror (errno));
+
+ /* Set GID first, or the setuid may remove our permission
+ * to change the GID
+ */
+ if (setgid (gid) < 0)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to set GID to %lu: %s", gid,
+ _dbus_strerror (errno));
+ goto fail;
+ }
+
+ if (setuid (uid) < 0)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to set UID to %lu: %s", uid,
+ _dbus_strerror (errno));
+ goto fail;
+ }
+
+#ifdef HAVE_LIBAUDIT
+ if (we_were_root)
+ {
+ if (cap_set_proc (new_caps))
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "Failed to drop capabilities: %s\n",
+ _dbus_strerror (errno));
+ goto fail;
+ }
+ cap_free (new_caps);
+
+ /* should always work, if it did above */
+ if (prctl (PR_SET_KEEPCAPS, 0, 0, 0, 0) == -1)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to unset keep-capabilities: %s\n",
+ _dbus_strerror (errno));
+ return FALSE;
+ }
+ }
+#endif
+
+ return TRUE;
+
+ fail:
+#ifdef HAVE_LIBAUDIT
+ if (!we_were_root)
+ {
+ /* should always work, if it did above */
+ prctl (PR_SET_KEEPCAPS, 0, 0, 0, 0);
+ cap_free (new_caps);
+ }
+#endif
+
+ return FALSE;
+}
+
+void
+_dbus_init_system_log (void)
+{
+ openlog ("dbus", LOG_PID, LOG_DAEMON);
+}
+
+/**
+ * Log an informative message. Intended for use primarily by
+ * the system bus.
+ *
+ * @param msg a printf-style format string
+ * @param args arguments for the format string
+ */
+void
+_dbus_log_info (const char *msg, va_list args)
+{
+ vsyslog (LOG_DAEMON|LOG_NOTICE, msg, args);
+}
+
+/**
+ * Log a security-related message. Intended for use primarily by
+ * the system bus.
+ *
+ * @param msg a printf-style format string
+ * @param args arguments for the format string
+ */
+void
+_dbus_log_security (const char *msg, va_list args)
+{
+ vsyslog (LOG_AUTH|LOG_NOTICE, msg, args);
+}
+
+/** Installs a UNIX signal handler
+ *
+ * @param sig the signal to handle
+ * @param handler the handler
+ */
+void
+_dbus_set_signal_handler (int sig,
+ DBusSignalHandler handler)
+{
+ struct sigaction act;
+ sigset_t empty_mask;
+
+ sigemptyset (&empty_mask);
+ act.sa_handler = handler;
+ act.sa_mask = empty_mask;
+ act.sa_flags = 0;
+ sigaction (sig, &act, NULL);
+}
+
+
+/**
+ * Removes a directory; Directory must be empty
+ *
+ * @param filename directory filename
+ * @param error initialized error object
+ * @returns #TRUE on success
+ */
+dbus_bool_t
+_dbus_delete_directory (const DBusString *filename,
+ DBusError *error)
+{
+ const char *filename_c;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ filename_c = _dbus_string_get_const_data (filename);
+
+ if (rmdir (filename_c) != 0)
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "Failed to remove directory %s: %s\n",
+ filename_c, _dbus_strerror (errno));
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/** Checks if a file exists
+*
+* @param file full path to the file
+* @returns #TRUE if file exists
+*/
+dbus_bool_t
+_dbus_file_exists (const char *file)
+{
+ return (access (file, F_OK) == 0);
+}
+
+/** Checks if user is at the console
+*
+* @param username user to check
+* @param error return location for errors
+* @returns #TRUE is the user is at the consolei and there are no errors
+*/
+dbus_bool_t
+_dbus_user_at_console (const char *username,
+ DBusError *error)
+{
+
+ DBusString f;
+ dbus_bool_t result;
+
+ result = FALSE;
+ if (!_dbus_string_init (&f))
+ {
+ _DBUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
+ {
+ _DBUS_SET_OOM (error);
+ goto out;
+ }
+
+
+ if (!_dbus_string_append (&f, username))
+ {
+ _DBUS_SET_OOM (error);
+ goto out;
+ }
+
+ result = _dbus_file_exists (_dbus_string_get_const_data (&f));
+
+ out:
+ _dbus_string_free (&f);
+
+ return result;
+}
+
+
+/**
+ * Checks whether the filename is an absolute path
+ *
+ * @param filename the filename
+ * @returns #TRUE if an absolute path
+ */
+dbus_bool_t
+_dbus_path_is_absolute (const DBusString *filename)
+{
+ if (_dbus_string_get_length (filename) > 0)
+ return _dbus_string_get_byte (filename, 0) == '/';
+ else
+ return FALSE;
+}
+
+/**
+ * stat() wrapper.
+ *
+ * @param filename the filename to stat
+ * @param statbuf the stat info to fill in
+ * @param error return location for error
+ * @returns #FALSE if error was set
+ */
+dbus_bool_t
+_dbus_stat (const DBusString *filename,
+ DBusStat *statbuf,
+ DBusError *error)
+{
+ const char *filename_c;
+ struct stat sb;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ filename_c = _dbus_string_get_const_data (filename);
+
+ if (stat (filename_c, &sb) < 0)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "%s", _dbus_strerror (errno));
+ return FALSE;
+ }
+
+ statbuf->mode = sb.st_mode;
+ statbuf->nlink = sb.st_nlink;
+ statbuf->uid = sb.st_uid;
+ statbuf->gid = sb.st_gid;
+ statbuf->size = sb.st_size;
+ statbuf->atime = sb.st_atime;
+ statbuf->mtime = sb.st_mtime;
+ statbuf->ctime = sb.st_ctime;
+
+ return TRUE;
+}
+
+
+/**
+ * Internals of directory iterator
+ */
+struct DBusDirIter
+{
+ DIR *d; /**< The DIR* from opendir() */
+
+};
+
+/**
+ * Open a directory to iterate over.
+ *
+ * @param filename the directory name
+ * @param error exception return object or #NULL
+ * @returns new iterator, or #NULL on error
+ */
+DBusDirIter*
+_dbus_directory_open (const DBusString *filename,
+ DBusError *error)
+{
+ DIR *d;
+ DBusDirIter *iter;
+ const char *filename_c;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ filename_c = _dbus_string_get_const_data (filename);
+
+ d = opendir (filename_c);
+ if (d == NULL)
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Failed to read directory \"%s\": %s",
+ filename_c,
+ _dbus_strerror (errno));
+ return NULL;
+ }
+ iter = dbus_new0 (DBusDirIter, 1);
+ if (iter == NULL)
+ {
+ closedir (d);
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
+ "Could not allocate memory for directory iterator");
+ return NULL;
+ }
+
+ iter->d = d;
+
+ return iter;
+}
+
+/* Calculate the required buffer size (in bytes) for directory
+ * entries read from the given directory handle. Return -1 if this
+ * this cannot be done.
+ *
+ * If you use autoconf, include fpathconf and dirfd in your
+ * AC_CHECK_FUNCS list. Otherwise use some other method to detect
+ * and use them where available.
+ */
+static dbus_bool_t
+dirent_buf_size(DIR * dirp, size_t *size)
+{
+ long name_max;
+# if defined(HAVE_FPATHCONF) && defined(_PC_NAME_MAX)
+# if defined(HAVE_DIRFD)
+ name_max = fpathconf(dirfd(dirp), _PC_NAME_MAX);
+# elif defined(HAVE_DDFD)
+ name_max = fpathconf(dirp->dd_fd, _PC_NAME_MAX);
+# else
+ name_max = fpathconf(dirp->__dd_fd, _PC_NAME_MAX);
+# endif /* HAVE_DIRFD */
+ if (name_max == -1)
+# if defined(NAME_MAX)
+ name_max = NAME_MAX;
+# else
+ return FALSE;
+# endif
+# elif defined(MAXNAMELEN)
+ name_max = MAXNAMELEN;
+# else
+# if defined(NAME_MAX)
+ name_max = NAME_MAX;
+# else
+# error "buffer size for readdir_r cannot be determined"
+# endif
+# endif
+ if (size)
+ *size = (size_t)offsetof(struct dirent, d_name) + name_max + 1;
+ else
+ return FALSE;
+
+ return TRUE;
+}
+
+/**
+ * Get next file in the directory. Will not return "." or ".." on
+ * UNIX. If an error occurs, the contents of "filename" are
+ * undefined. The error is never set if the function succeeds.
+ *
+ * @param iter the iterator
+ * @param filename string to be set to the next file in the dir
+ * @param error return location for error
+ * @returns #TRUE if filename was filled in with a new filename
+ */
+dbus_bool_t
+_dbus_directory_get_next_file (DBusDirIter *iter,
+ DBusString *filename,
+ DBusError *error)
+{
+ struct dirent *d, *ent;
+ size_t buf_size;
+ int err;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ if (!dirent_buf_size (iter->d, &buf_size))
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "Can't calculate buffer size when reading directory");
+ return FALSE;
+ }
+
+ d = (struct dirent *)dbus_malloc (buf_size);
+ if (!d)
+ {
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
+ "No memory to read directory entry");
+ return FALSE;
+ }
+
+ again:
+ err = readdir_r (iter->d, d, &ent);
+ if (err || !ent)
+ {
+ if (err != 0)
+ dbus_set_error (error,
+ _dbus_error_from_errno (err),
+ "%s", _dbus_strerror (err));
+
+ dbus_free (d);
+ return FALSE;
+ }
+ else if (ent->d_name[0] == '.' &&
+ (ent->d_name[1] == '\0' ||
+ (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
+ goto again;
+ else
+ {
+ _dbus_string_set_length (filename, 0);
+ if (!_dbus_string_append (filename, ent->d_name))
+ {
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
+ "No memory to read directory entry");
+ dbus_free (d);
+ return FALSE;
+ }
+ else
+ {
+ dbus_free (d);
+ return TRUE;
+ }
+ }
+}
+
+/**
+ * Closes a directory iteration.
+ */
+void
+_dbus_directory_close (DBusDirIter *iter)
+{
+ closedir (iter->d);
+ dbus_free (iter);
+}
+
+static dbus_bool_t
+fill_user_info_from_group (struct group *g,
+ DBusGroupInfo *info,
+ DBusError *error)
+{
+ _dbus_assert (g->gr_name != NULL);
+
+ info->gid = g->gr_gid;
+ info->groupname = _dbus_strdup (g->gr_name);
+
+ /* info->members = dbus_strdupv (g->gr_mem) */
+
+ if (info->groupname == NULL)
+ {
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static dbus_bool_t
+fill_group_info (DBusGroupInfo *info,
+ dbus_gid_t gid,
+ const DBusString *groupname,
+ DBusError *error)
+{
+ const char *group_c_str;
+
+ _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
+ _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
+
+ if (groupname)
+ group_c_str = _dbus_string_get_const_data (groupname);
+ else
+ group_c_str = NULL;
+
+ /* For now assuming that the getgrnam() and getgrgid() flavors
+ * always correspond to the pwnam flavors, if not we have
+ * to add more configure checks.
+ */
+
+#if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
+ {
+ struct group *g;
+ int result;
+ size_t buflen;
+ char *buf;
+ struct group g_str;
+ dbus_bool_t b;
+
+ /* retrieve maximum needed size for buf */
+ buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
+
+ /* sysconf actually returns a long, but everything else expects size_t,
+ * so just recast here.
+ * https://bugs.freedesktop.org/show_bug.cgi?id=17061
+ */
+ if ((long) buflen <= 0)
+ buflen = 1024;
+
+ result = -1;
+ while (1)
+ {
+ buf = dbus_malloc (buflen);
+ if (buf == NULL)
+ {
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ return FALSE;
+ }
+
+ g = NULL;
+#ifdef HAVE_POSIX_GETPWNAM_R
+ if (group_c_str)
+ result = getgrnam_r (group_c_str, &g_str, buf, buflen,
+ &g);
+ else
+ result = getgrgid_r (gid, &g_str, buf, buflen,
+ &g);
+#else
+ g = getgrnam_r (group_c_str, &g_str, buf, buflen);
+ result = 0;
+#endif /* !HAVE_POSIX_GETPWNAM_R */
+ /* Try a bigger buffer if ERANGE was returned:
+ https://bugs.freedesktop.org/show_bug.cgi?id=16727
+ */
+ if (result == ERANGE && buflen < 512 * 1024)
+ {
+ dbus_free (buf);
+ buflen *= 2;
+ }
+ else
+ {
+ break;
+ }
+ }
+
+ if (result == 0 && g == &g_str)
+ {
+ b = fill_user_info_from_group (g, info, error);
+ dbus_free (buf);
+ return b;
+ }
+ else
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Group %s unknown or failed to look it up\n",
+ group_c_str ? group_c_str : "???");
+ dbus_free (buf);
+ return FALSE;
+ }
+ }
+#else /* ! HAVE_GETPWNAM_R */
+ {
+ /* I guess we're screwed on thread safety here */
+ struct group *g;
+
+ g = getgrnam (group_c_str);
+
+ if (g != NULL)
+ {
+ return fill_user_info_from_group (g, info, error);
+ }
+ else
+ {
+ dbus_set_error (error, _dbus_error_from_errno (errno),
+ "Group %s unknown or failed to look it up\n",
+ group_c_str ? group_c_str : "???");
+ return FALSE;
+ }
+ }
+#endif /* ! HAVE_GETPWNAM_R */
+}
+
+/**
+ * Initializes the given DBusGroupInfo struct
+ * with information about the given group name.
+ *
+ * @param info the group info struct
+ * @param groupname name of group
+ * @param error the error return
+ * @returns #FALSE if error is set
+ */
+dbus_bool_t
+_dbus_group_info_fill (DBusGroupInfo *info,
+ const DBusString *groupname,
+ DBusError *error)
+{
+ return fill_group_info (info, DBUS_GID_UNSET,
+ groupname, error);
+
+}
+
+/**
+ * Initializes the given DBusGroupInfo struct
+ * with information about the given group ID.
+ *
+ * @param info the group info struct
+ * @param gid group ID
+ * @param error the error return
+ * @returns #FALSE if error is set
+ */
+dbus_bool_t
+_dbus_group_info_fill_gid (DBusGroupInfo *info,
+ dbus_gid_t gid,
+ DBusError *error)
+{
+ return fill_group_info (info, gid, NULL, error);
+}
+
+/**
+ * Parse a UNIX user from the bus config file. On Windows, this should
+ * simply always fail (just return #FALSE).
+ *
+ * @param username the username text
+ * @param uid_p place to return the uid
+ * @returns #TRUE on success
+ */
+dbus_bool_t
+_dbus_parse_unix_user_from_config (const DBusString *username,
+ dbus_uid_t *uid_p)
+{
+ return _dbus_get_user_id (username, uid_p);
+
+}
+
+/**
+ * Parse a UNIX group from the bus config file. On Windows, this should
+ * simply always fail (just return #FALSE).
+ *
+ * @param groupname the groupname text
+ * @param gid_p place to return the gid
+ * @returns #TRUE on success
+ */
+dbus_bool_t
+_dbus_parse_unix_group_from_config (const DBusString *groupname,
+ dbus_gid_t *gid_p)
+{
+ return _dbus_get_group_id (groupname, gid_p);
+}
+
+/**
+ * Gets all groups corresponding to the given UNIX user ID. On UNIX,
+ * just calls _dbus_groups_from_uid(). On Windows, should always
+ * fail since we don't know any UNIX groups.
+ *
+ * @param uid the UID
+ * @param group_ids return location for array of group IDs
+ * @param n_group_ids return location for length of returned array
+ * @returns #TRUE if the UID existed and we got some credentials
+ */
+dbus_bool_t
+_dbus_unix_groups_from_uid (dbus_uid_t uid,
+ dbus_gid_t **group_ids,
+ int *n_group_ids)
+{
+ return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
+}
+
+/**
+ * Checks to see if the UNIX user ID is at the console.
+ * Should always fail on Windows (set the error to
+ * #DBUS_ERROR_NOT_SUPPORTED).
+ *
+ * @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_unix_user_is_at_console (dbus_uid_t uid,
+ DBusError *error)
+{
+ return _dbus_is_console_user (uid, error);
+
+}
+
+/**
+ * Checks to see if the UNIX user ID matches the UID of
+ * the process. Should always return #FALSE on Windows.
+ *
+ * @param uid the UNIX user ID
+ * @returns #TRUE if this uid owns the process.
+ */
+dbus_bool_t
+_dbus_unix_user_is_process_owner (dbus_uid_t uid)
+{
+ return uid == _dbus_geteuid ();
+}
+
+/**
+ * Checks to see if the Windows user SID matches the owner of
+ * the process. Should always return #FALSE on UNIX.
+ *
+ * @param windows_sid the Windows user SID
+ * @returns #TRUE if this user owns the process.
+ */
+dbus_bool_t
+_dbus_windows_user_is_process_owner (const char *windows_sid)
+{
+ return FALSE;
+}
+
+/** @} */ /* End of DBusInternalsUtils functions */
+
+/**
+ * @addtogroup DBusString
+ *
+ * @{
+ */
+/**
+ * Get the directory name from a complete filename
+ * @param filename the filename
+ * @param dirname string to append directory name to
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_string_get_dirname (const DBusString *filename,
+ DBusString *dirname)
+{
+ int sep;
+
+ _dbus_assert (filename != dirname);
+ _dbus_assert (filename != NULL);
+ _dbus_assert (dirname != NULL);
+
+ /* Ignore any separators on the end */
+ sep = _dbus_string_get_length (filename);
+ if (sep == 0)
+ return _dbus_string_append (dirname, "."); /* empty string passed in */
+
+ while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
+ --sep;
+
+ _dbus_assert (sep >= 0);
+
+ if (sep == 0)
+ return _dbus_string_append (dirname, "/");
+
+ /* Now find the previous separator */
+ _dbus_string_find_byte_backward (filename, sep, '/', &sep);
+ if (sep < 0)
+ return _dbus_string_append (dirname, ".");
+
+ /* skip multiple separators */
+ while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
+ --sep;
+
+ _dbus_assert (sep >= 0);
+
+ if (sep == 0 &&
+ _dbus_string_get_byte (filename, 0) == '/')
+ return _dbus_string_append (dirname, "/");
+ else
+ return _dbus_string_copy_len (filename, 0, sep - 0,
+ dirname, _dbus_string_get_length (dirname));
+}
+/** @} */ /* DBusString stuff */
+
+static void
+string_squash_nonprintable (DBusString *str)
+{
+ char *buf;
+ int i, len;
+
+ buf = _dbus_string_get_data (str);
+ len = _dbus_string_get_length (str);
+
+ for (i = 0; i < len; i++)
+ if (buf[i] == '\0')
+ buf[i] = ' ';
+ else if (buf[i] < 0x20 || buf[i] > 127)
+ buf[i] = '?';
+}
+
+/**
+ * Get a printable string describing the command used to execute
+ * the process with pid. This string should only be used for
+ * informative purposes such as logging; it may not be trusted.
+ *
+ * The command is guaranteed to be printable ASCII and no longer
+ * than max_len.
+ *
+ * @param pid Process id
+ * @param str Append command to this string
+ * @param max_len Maximum length of returned command
+ * @param error return location for errors
+ * @returns #FALSE on error
+ */
+dbus_bool_t
+_dbus_command_for_pid (unsigned long pid,
+ DBusString *str,
+ int max_len,
+ DBusError *error)
+{
+ /* This is all Linux-specific for now */
+ DBusString path;
+ DBusString cmdline;
+ int fd;
+
+ if (!_dbus_string_init (&path))
+ {
+ _DBUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ if (!_dbus_string_init (&cmdline))
+ {
+ _DBUS_SET_OOM (error);
+ _dbus_string_free (&path);
+ return FALSE;
+ }
+
+ if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
+ goto oom;
+
+ fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
+ if (fd < 0)
+ {
+ dbus_set_error (error,
+ _dbus_error_from_errno (errno),
+ "Failed to open \"%s\": %s",
+ _dbus_string_get_const_data (&path),
+ _dbus_strerror (errno));
+ goto fail;
+ }
+
+ if (!_dbus_read (fd, &cmdline, max_len))
+ {
+ dbus_set_error (error,
+ _dbus_error_from_errno (errno),
+ "Failed to read from \"%s\": %s",
+ _dbus_string_get_const_data (&path),
+ _dbus_strerror (errno));
+ goto fail;
+ }
+
+ if (!_dbus_close (fd, error))
+ goto fail;
+
+ string_squash_nonprintable (&cmdline);
+
+ if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
+ goto oom;
+
+ _dbus_string_free (&cmdline);
+ _dbus_string_free (&path);
+ return TRUE;
+oom:
+ _DBUS_SET_OOM (error);
+fail:
+ _dbus_string_free (&cmdline);
+ _dbus_string_free (&path);
+ return FALSE;
+}
+
projects / monky / blobdiff