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768 lines
16 KiB
768 lines
16 KiB
/*
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* Copyright © 2012 Benjamin Franzke
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of the copyright holders not be used in
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* advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. The copyright holders make
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <poll.h>
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#include <errno.h>
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#include <error.h>
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#include <getopt.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <sys/signalfd.h>
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#include <signal.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <linux/vt.h>
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#include <linux/major.h>
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#include <linux/kd.h>
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#include <pwd.h>
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#include <grp.h>
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#include <security/pam_appl.h>
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#ifdef HAVE_SYSTEMD_LOGIN
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#include <systemd/sd-login.h>
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#endif
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#include "weston-launch.h"
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#define DRM_MAJOR 226
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#ifndef KDSKBMUTE
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#define KDSKBMUTE 0x4B51
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#endif
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#ifndef EVIOCREVOKE
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#define EVIOCREVOKE _IOW('E', 0x91, int)
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#endif
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#define MAX_ARGV_SIZE 256
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#ifdef HAVE_LIBDRM
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#include <xf86drm.h>
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#else
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static inline int
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drmDropMaster(int drm_fd)
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{
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return 0;
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}
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static inline int
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drmSetMaster(int drm_fd)
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{
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return 0;
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}
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#endif
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struct weston_launch {
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struct pam_conv pc;
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pam_handle_t *ph;
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int tty;
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int ttynr;
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int sock[2];
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int drm_fd;
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int last_input_fd;
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int kb_mode;
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struct passwd *pw;
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int signalfd;
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pid_t child;
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int verbose;
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char *new_user;
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};
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union cmsg_data { unsigned char b[4]; int fd; };
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static gid_t *
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read_groups(void)
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{
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int n;
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gid_t *groups;
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n = getgroups(0, NULL);
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if (n < 0) {
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fprintf(stderr, "Unable to retrieve groups: %m\n");
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return NULL;
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}
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groups = malloc(n * sizeof(gid_t));
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if (!groups)
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return NULL;
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if (getgroups(n, groups) < 0) {
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fprintf(stderr, "Unable to retrieve groups: %m\n");
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free(groups);
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return NULL;
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}
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return groups;
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}
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static int
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weston_launch_allowed(struct weston_launch *wl)
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{
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struct group *gr;
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gid_t *groups;
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int i;
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#ifdef HAVE_SYSTEMD_LOGIN
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char *session, *seat;
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int err;
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#endif
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if (getuid() == 0)
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return 1;
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gr = getgrnam("weston-launch");
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if (gr) {
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groups = read_groups();
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if (groups) {
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for (i = 0; groups[i]; ++i) {
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if (groups[i] == gr->gr_gid) {
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free(groups);
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return 1;
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}
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}
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free(groups);
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}
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}
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#ifdef HAVE_SYSTEMD_LOGIN
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err = sd_pid_get_session(getpid(), &session);
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if (err == 0 && session) {
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if (sd_session_is_active(session) &&
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sd_session_get_seat(session, &seat) == 0) {
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free(seat);
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free(session);
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return 1;
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}
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free(session);
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}
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#endif
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return 0;
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}
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static int
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pam_conversation_fn(int msg_count,
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const struct pam_message **messages,
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struct pam_response **responses,
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void *user_data)
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{
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return PAM_SUCCESS;
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}
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static int
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setup_pam(struct weston_launch *wl)
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{
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int err;
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wl->pc.conv = pam_conversation_fn;
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wl->pc.appdata_ptr = wl;
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err = pam_start("login", wl->pw->pw_name, &wl->pc, &wl->ph);
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if (err != PAM_SUCCESS) {
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fprintf(stderr, "failed to start pam transaction: %d: %s\n",
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err, pam_strerror(wl->ph, err));
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return -1;
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}
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err = pam_set_item(wl->ph, PAM_TTY, ttyname(wl->tty));
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if (err != PAM_SUCCESS) {
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fprintf(stderr, "failed to set PAM_TTY item: %d: %s\n",
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err, pam_strerror(wl->ph, err));
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return -1;
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}
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err = pam_open_session(wl->ph, 0);
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if (err != PAM_SUCCESS) {
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fprintf(stderr, "failed to open pam session: %d: %s\n",
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err, pam_strerror(wl->ph, err));
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return -1;
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}
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return 0;
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}
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static int
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setup_launcher_socket(struct weston_launch *wl)
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{
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if (socketpair(AF_LOCAL, SOCK_SEQPACKET, 0, wl->sock) < 0)
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error(1, errno, "socketpair failed");
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if (fcntl(wl->sock[0], F_SETFD, FD_CLOEXEC) < 0)
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error(1, errno, "fcntl failed");
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return 0;
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}
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static int
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setup_signals(struct weston_launch *wl)
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{
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int ret;
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sigset_t mask;
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struct sigaction sa;
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memset(&sa, 0, sizeof sa);
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sa.sa_handler = SIG_DFL;
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sa.sa_flags = SA_NOCLDSTOP | SA_RESTART;
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ret = sigaction(SIGCHLD, &sa, NULL);
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assert(ret == 0);
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sa.sa_handler = SIG_IGN;
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sa.sa_flags = 0;
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sigaction(SIGHUP, &sa, NULL);
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ret = sigemptyset(&mask);
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assert(ret == 0);
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sigaddset(&mask, SIGCHLD);
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sigaddset(&mask, SIGINT);
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sigaddset(&mask, SIGTERM);
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sigaddset(&mask, SIGUSR1);
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sigaddset(&mask, SIGUSR2);
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ret = sigprocmask(SIG_BLOCK, &mask, NULL);
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assert(ret == 0);
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wl->signalfd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC);
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if (wl->signalfd < 0)
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return -errno;
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return 0;
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}
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static void
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setenv_fd(const char *env, int fd)
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{
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char buf[32];
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snprintf(buf, sizeof buf, "%d", fd);
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setenv(env, buf, 1);
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}
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static int
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send_reply(struct weston_launch *wl, int reply)
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{
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int len;
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do {
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len = send(wl->sock[0], &reply, sizeof reply, 0);
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} while (len < 0 && errno == EINTR);
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return len;
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}
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static int
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handle_open(struct weston_launch *wl, struct msghdr *msg, ssize_t len)
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{
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int fd = -1, ret = -1;
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char control[CMSG_SPACE(sizeof(fd))];
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struct cmsghdr *cmsg;
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struct stat s;
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struct msghdr nmsg;
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struct iovec iov;
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struct weston_launcher_open *message;
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union cmsg_data *data;
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message = msg->msg_iov->iov_base;
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if ((size_t)len < sizeof(*message))
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goto err0;
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/* Ensure path is null-terminated */
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((char *) message)[len-1] = '\0';
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fd = open(message->path, message->flags);
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if (fd < 0) {
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fprintf(stderr, "Error opening device %s: %m\n",
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message->path);
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goto err0;
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}
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if (fstat(fd, &s) < 0) {
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close(fd);
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fd = -1;
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fprintf(stderr, "Failed to stat %s\n", message->path);
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goto err0;
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}
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if (major(s.st_rdev) != INPUT_MAJOR &&
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major(s.st_rdev) != DRM_MAJOR) {
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close(fd);
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fd = -1;
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fprintf(stderr, "Device %s is not an input or drm device\n",
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message->path);
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goto err0;
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}
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err0:
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memset(&nmsg, 0, sizeof nmsg);
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nmsg.msg_iov = &iov;
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nmsg.msg_iovlen = 1;
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if (fd != -1) {
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nmsg.msg_control = control;
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nmsg.msg_controllen = sizeof control;
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cmsg = CMSG_FIRSTHDR(&nmsg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
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data = (union cmsg_data *) CMSG_DATA(cmsg);
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data->fd = fd;
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nmsg.msg_controllen = cmsg->cmsg_len;
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ret = 0;
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}
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iov.iov_base = &ret;
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iov.iov_len = sizeof ret;
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if (wl->verbose)
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fprintf(stderr, "weston-launch: opened %s: ret: %d, fd: %d\n",
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message->path, ret, fd);
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do {
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len = sendmsg(wl->sock[0], &nmsg, 0);
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} while (len < 0 && errno == EINTR);
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if (len < 0)
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return -1;
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if (fd != -1 && major(s.st_rdev) == DRM_MAJOR)
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wl->drm_fd = fd;
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if (fd != -1 && major(s.st_rdev) == INPUT_MAJOR &&
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wl->last_input_fd < fd)
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wl->last_input_fd = fd;
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return 0;
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}
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static int
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handle_socket_msg(struct weston_launch *wl)
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{
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char control[CMSG_SPACE(sizeof(int))];
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char buf[BUFSIZ];
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struct msghdr msg;
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struct iovec iov;
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int ret = -1;
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ssize_t len;
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struct weston_launcher_message *message;
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memset(&msg, 0, sizeof(msg));
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iov.iov_base = buf;
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iov.iov_len = sizeof buf;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = control;
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msg.msg_controllen = sizeof control;
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do {
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len = recvmsg(wl->sock[0], &msg, 0);
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} while (len < 0 && errno == EINTR);
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if (len < 1)
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return -1;
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message = (void *) buf;
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switch (message->opcode) {
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case WESTON_LAUNCHER_OPEN:
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ret = handle_open(wl, &msg, len);
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break;
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}
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return ret;
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}
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static void
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quit(struct weston_launch *wl, int status)
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{
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struct vt_mode mode = { 0 };
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int err;
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close(wl->signalfd);
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close(wl->sock[0]);
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if (wl->new_user) {
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err = pam_close_session(wl->ph, 0);
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if (err)
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fprintf(stderr, "pam_close_session failed: %d: %s\n",
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err, pam_strerror(wl->ph, err));
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pam_end(wl->ph, err);
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}
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if (ioctl(wl->tty, KDSKBMUTE, 0) &&
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ioctl(wl->tty, KDSKBMODE, wl->kb_mode))
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fprintf(stderr, "failed to restore keyboard mode: %m\n");
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if (ioctl(wl->tty, KDSETMODE, KD_TEXT))
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fprintf(stderr, "failed to set KD_TEXT mode on tty: %m\n");
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/* We have to drop master before we switch the VT back in
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* VT_AUTO, so we don't risk switching to a VT with another
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* display server, that will then fail to set drm master. */
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drmDropMaster(wl->drm_fd);
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mode.mode = VT_AUTO;
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if (ioctl(wl->tty, VT_SETMODE, &mode) < 0)
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fprintf(stderr, "could not reset vt handling\n");
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exit(status);
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}
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static void
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close_input_fds(struct weston_launch *wl)
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{
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struct stat s;
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int fd;
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for (fd = 3; fd <= wl->last_input_fd; fd++) {
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if (fstat(fd, &s) == 0 && major(s.st_rdev) == INPUT_MAJOR) {
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/* EVIOCREVOKE may fail if the kernel doesn't
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* support it, but all we can do is ignore it. */
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ioctl(fd, EVIOCREVOKE, 0);
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close(fd);
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}
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}
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}
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static int
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handle_signal(struct weston_launch *wl)
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{
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struct signalfd_siginfo sig;
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int pid, status, ret;
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if (read(wl->signalfd, &sig, sizeof sig) != sizeof sig) {
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error(0, errno, "reading signalfd failed");
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return -1;
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}
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switch (sig.ssi_signo) {
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case SIGCHLD:
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pid = waitpid(-1, &status, 0);
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if (pid == wl->child) {
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wl->child = 0;
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if (WIFEXITED(status))
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ret = WEXITSTATUS(status);
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else if (WIFSIGNALED(status))
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/*
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* If weston dies because of signal N, we
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* return 10+N. This is distinct from
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* weston-launch dying because of a signal
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* (128+N).
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*/
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ret = 10 + WTERMSIG(status);
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else
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ret = 0;
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quit(wl, ret);
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}
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break;
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case SIGTERM:
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case SIGINT:
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if (wl->child)
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kill(wl->child, sig.ssi_signo);
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break;
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case SIGUSR1:
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send_reply(wl, WESTON_LAUNCHER_DEACTIVATE);
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close_input_fds(wl);
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drmDropMaster(wl->drm_fd);
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ioctl(wl->tty, VT_RELDISP, 1);
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break;
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case SIGUSR2:
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ioctl(wl->tty, VT_RELDISP, VT_ACKACQ);
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drmSetMaster(wl->drm_fd);
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send_reply(wl, WESTON_LAUNCHER_ACTIVATE);
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break;
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default:
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return -1;
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}
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return 0;
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}
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static int
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setup_tty(struct weston_launch *wl, const char *tty)
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{
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struct stat buf;
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struct vt_mode mode = { 0 };
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char *t;
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if (!wl->new_user) {
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wl->tty = STDIN_FILENO;
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} else if (tty) {
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t = ttyname(STDIN_FILENO);
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if (t && strcmp(t, tty) == 0)
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wl->tty = STDIN_FILENO;
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else
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wl->tty = open(tty, O_RDWR | O_NOCTTY);
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} else {
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int tty0 = open("/dev/tty0", O_WRONLY | O_CLOEXEC);
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char filename[16];
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if (tty0 < 0)
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error(1, errno, "could not open tty0");
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if (ioctl(tty0, VT_OPENQRY, &wl->ttynr) < 0 || wl->ttynr == -1)
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error(1, errno, "failed to find non-opened console");
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snprintf(filename, sizeof filename, "/dev/tty%d", wl->ttynr);
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wl->tty = open(filename, O_RDWR | O_NOCTTY);
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close(tty0);
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}
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if (wl->tty < 0)
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error(1, errno, "failed to open tty");
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if (fstat(wl->tty, &buf) == -1 ||
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major(buf.st_rdev) != TTY_MAJOR || minor(buf.st_rdev) == 0)
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error(1, 0, "weston-launch must be run from a virtual terminal");
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if (tty) {
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if (fstat(wl->tty, &buf) < 0)
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error(1, errno, "stat %s failed", tty);
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|
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if (major(buf.st_rdev) != TTY_MAJOR)
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error(1, 0, "invalid tty device: %s", tty);
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|
|
|
wl->ttynr = minor(buf.st_rdev);
|
|
}
|
|
|
|
if (ioctl(wl->tty, KDGKBMODE, &wl->kb_mode))
|
|
error(1, errno, "failed to get current keyboard mode: %m\n");
|
|
|
|
if (ioctl(wl->tty, KDSKBMUTE, 1) &&
|
|
ioctl(wl->tty, KDSKBMODE, K_OFF))
|
|
error(1, errno, "failed to set K_OFF keyboard mode: %m\n");
|
|
|
|
if (ioctl(wl->tty, KDSETMODE, KD_GRAPHICS))
|
|
error(1, errno, "failed to set KD_GRAPHICS mode on tty: %m\n");
|
|
|
|
mode.mode = VT_PROCESS;
|
|
mode.relsig = SIGUSR1;
|
|
mode.acqsig = SIGUSR2;
|
|
if (ioctl(wl->tty, VT_SETMODE, &mode) < 0)
|
|
error(1, errno, "failed to take control of vt handling\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
setup_session(struct weston_launch *wl)
|
|
{
|
|
char **env;
|
|
char *term;
|
|
int i;
|
|
|
|
if (wl->tty != STDIN_FILENO) {
|
|
if (setsid() < 0)
|
|
error(1, errno, "setsid failed");
|
|
if (ioctl(wl->tty, TIOCSCTTY, 0) < 0)
|
|
error(1, errno, "TIOCSCTTY failed - tty is in use");
|
|
}
|
|
|
|
term = getenv("TERM");
|
|
clearenv();
|
|
if (term)
|
|
setenv("TERM", term, 1);
|
|
setenv("USER", wl->pw->pw_name, 1);
|
|
setenv("LOGNAME", wl->pw->pw_name, 1);
|
|
setenv("HOME", wl->pw->pw_dir, 1);
|
|
setenv("SHELL", wl->pw->pw_shell, 1);
|
|
|
|
env = pam_getenvlist(wl->ph);
|
|
if (env) {
|
|
for (i = 0; env[i]; ++i) {
|
|
if (putenv(env[i]) < 0)
|
|
error(0, 0, "putenv %s failed", env[i]);
|
|
}
|
|
free(env);
|
|
}
|
|
}
|
|
|
|
static void
|
|
drop_privileges(struct weston_launch *wl)
|
|
{
|
|
if (setgid(wl->pw->pw_gid) < 0 ||
|
|
#ifdef HAVE_INITGROUPS
|
|
initgroups(wl->pw->pw_name, wl->pw->pw_gid) < 0 ||
|
|
#endif
|
|
setuid(wl->pw->pw_uid) < 0)
|
|
error(1, errno, "dropping privileges failed");
|
|
}
|
|
|
|
static void
|
|
launch_compositor(struct weston_launch *wl, int argc, char *argv[])
|
|
{
|
|
char *child_argv[MAX_ARGV_SIZE];
|
|
sigset_t mask;
|
|
int i;
|
|
|
|
if (wl->verbose)
|
|
printf("weston-launch: spawned weston with pid: %d\n", getpid());
|
|
if (wl->new_user)
|
|
setup_session(wl);
|
|
|
|
if (geteuid() == 0)
|
|
drop_privileges(wl);
|
|
|
|
setenv_fd("WESTON_TTY_FD", wl->tty);
|
|
setenv_fd("WESTON_LAUNCHER_SOCK", wl->sock[1]);
|
|
|
|
unsetenv("DISPLAY");
|
|
|
|
/* Do not give our signal mask to the new process. */
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, SIGTERM);
|
|
sigaddset(&mask, SIGCHLD);
|
|
sigaddset(&mask, SIGINT);
|
|
sigprocmask(SIG_UNBLOCK, &mask, NULL);
|
|
|
|
child_argv[0] = "/bin/sh";
|
|
child_argv[1] = "-l";
|
|
child_argv[2] = "-c";
|
|
child_argv[3] = BINDIR "/weston \"$@\"";
|
|
child_argv[4] = "weston";
|
|
for (i = 0; i < argc; ++i)
|
|
child_argv[5 + i] = argv[i];
|
|
child_argv[5 + i] = NULL;
|
|
|
|
execv(child_argv[0], child_argv);
|
|
error(1, errno, "exec failed");
|
|
}
|
|
|
|
static void
|
|
help(const char *name)
|
|
{
|
|
fprintf(stderr, "Usage: %s [args...] [-- [weston args..]]\n", name);
|
|
fprintf(stderr, " -u, --user Start session as specified username\n");
|
|
fprintf(stderr, " -t, --tty Start session on alternative tty\n");
|
|
fprintf(stderr, " -v, --verbose Be verbose\n");
|
|
fprintf(stderr, " -h, --help Display this help message\n");
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct weston_launch wl;
|
|
int i, c;
|
|
char *tty = NULL;
|
|
struct option opts[] = {
|
|
{ "user", required_argument, NULL, 'u' },
|
|
{ "tty", required_argument, NULL, 't' },
|
|
{ "verbose", no_argument, NULL, 'v' },
|
|
{ "help", no_argument, NULL, 'h' },
|
|
{ 0, 0, NULL, 0 }
|
|
};
|
|
|
|
memset(&wl, 0, sizeof wl);
|
|
|
|
while ((c = getopt_long(argc, argv, "u:t::vh", opts, &i)) != -1) {
|
|
switch (c) {
|
|
case 'u':
|
|
wl.new_user = optarg;
|
|
if (getuid() != 0)
|
|
error(1, 0, "Permission denied. -u allowed for root only");
|
|
break;
|
|
case 't':
|
|
tty = optarg;
|
|
break;
|
|
case 'v':
|
|
wl.verbose = 1;
|
|
break;
|
|
case 'h':
|
|
help("weston-launch");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
if ((argc - optind) > (MAX_ARGV_SIZE - 6))
|
|
error(1, E2BIG, "Too many arguments to pass to weston");
|
|
|
|
if (wl.new_user)
|
|
wl.pw = getpwnam(wl.new_user);
|
|
else
|
|
wl.pw = getpwuid(getuid());
|
|
if (wl.pw == NULL)
|
|
error(1, errno, "failed to get username");
|
|
|
|
if (!weston_launch_allowed(&wl))
|
|
error(1, 0, "Permission denied. You should either:\n"
|
|
#ifdef HAVE_SYSTEMD_LOGIN
|
|
" - run from an active and local (systemd) session.\n"
|
|
#else
|
|
" - enable systemd session support for weston-launch.\n"
|
|
#endif
|
|
" - or add yourself to the 'weston-launch' group.");
|
|
|
|
if (setup_tty(&wl, tty) < 0)
|
|
exit(EXIT_FAILURE);
|
|
|
|
if (wl.new_user && setup_pam(&wl) < 0)
|
|
exit(EXIT_FAILURE);
|
|
|
|
if (setup_launcher_socket(&wl) < 0)
|
|
exit(EXIT_FAILURE);
|
|
|
|
if (setup_signals(&wl) < 0)
|
|
exit(EXIT_FAILURE);
|
|
|
|
wl.child = fork();
|
|
if (wl.child == -1) {
|
|
error(1, errno, "fork failed");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (wl.child == 0)
|
|
launch_compositor(&wl, argc - optind, argv + optind);
|
|
|
|
close(wl.sock[1]);
|
|
if (wl.tty != STDIN_FILENO)
|
|
close(wl.tty);
|
|
|
|
while (1) {
|
|
struct pollfd fds[2];
|
|
int n;
|
|
|
|
fds[0].fd = wl.sock[0];
|
|
fds[0].events = POLLIN;
|
|
fds[1].fd = wl.signalfd;
|
|
fds[1].events = POLLIN;
|
|
|
|
n = poll(fds, 2, -1);
|
|
if (n < 0)
|
|
error(0, errno, "poll failed");
|
|
if (fds[0].revents & POLLIN)
|
|
handle_socket_msg(&wl);
|
|
if (fds[1].revents)
|
|
handle_signal(&wl);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|