From 7d2fea61a95e9498b5a19c8cffcb2ab5631d5685 Mon Sep 17 00:00:00 2001 From: Tom Hochstein Date: Wed, 22 Feb 2017 15:53:30 +0200 Subject: [PATCH] weston-launch: Provide a default version that doesn't require PAM weston-launch requires PAM for starting weston as a non-root user. Since starting weston as root is a valid use case by itself, if PAM is not available, provide a default version of weston-launch without non-root-user support. Upstream-Status: Pending Signed-off-by: Tom Hochstein Signed-off-by: Jussi Kukkonen Signed-off-by: Denys Dmytriyenko --- configure.ac | 9 +++++++-- libweston/weston-launch.c | 20 ++++++++++++++++++++ 2 files changed, 27 insertions(+), 2 deletions(-) diff --git a/configure.ac b/configure.ac index 6da6e04..681f7c8 100644 --- a/configure.ac +++ b/configure.ac @@ -515,13 +515,17 @@ AC_ARG_ENABLE(resize-optimization, AS_IF([test "x$enable_resize_optimization" = "xyes"], [AC_DEFINE([USE_RESIZE_POOL], [1], [Use resize memory pool as a performance optimization])]) +AC_ARG_WITH(pam, + AS_HELP_STRING([--with-pam], [Use PAM]), + [use_pam=$withval], [use_pam=yes]) AC_ARG_ENABLE(weston-launch, [ --enable-weston-launch],, enable_weston_launch=yes) AM_CONDITIONAL(BUILD_WESTON_LAUNCH, test x$enable_weston_launch = xyes) -if test x$enable_weston_launch = xyes; then +if test x$enable_weston_launch = xyes -a x$use_pam = xyes; then WESTON_SEARCH_LIBS([PAM], [pam], [pam_open_session], [have_pam=yes], [have_pam=no]) if test x$have_pam = xno; then - AC_ERROR([weston-launch requires pam]) + AC_ERROR([PAM support is explicitly requested, but libpam couldn't be found]) fi + AC_DEFINE([HAVE_PAM], [1], [Define if PAM is available]) fi AM_CONDITIONAL(HAVE_PANGO, test "x$have_pango" = "xyes") @@ -767,6 +771,7 @@ AC_MSG_RESULT([ Enable developer documentation ${enable_devdocs} weston-launch utility ${enable_weston_launch} + PAM support ${use_pam} systemd-login support ${have_systemd_login} systemd notify support ${enable_systemd_notify} diff --git a/libweston/weston-launch.c b/libweston/weston-launch.c index 9064439..c6abe92 100644 --- a/libweston/weston-launch.c +++ b/libweston/weston-launch.c @@ -51,7 +51,9 @@ #include #include +#ifdef HAVE_PAM #include +#endif #ifdef HAVE_SYSTEMD_LOGIN #include @@ -101,8 +103,10 @@ drmSetMaster(int drm_fd) #endif struct weston_launch { +#ifdef HAVE_PAM struct pam_conv pc; pam_handle_t *ph; +#endif int tty; int ttynr; int sock[2]; @@ -191,6 +195,7 @@ weston_launch_allowed(struct weston_launch *wl) return false; } +#ifdef HAVE_PAM static int pam_conversation_fn(int msg_count, const struct pam_message **messages, @@ -231,6 +236,7 @@ setup_pam(struct weston_launch *wl) return 0; } +#endif static int setup_launcher_socket(struct weston_launch *wl) @@ -424,6 +430,7 @@ quit(struct weston_launch *wl, int status) close(wl->signalfd); close(wl->sock[0]); +#ifdef HAVE_PAM if (wl->new_user) { err = pam_close_session(wl->ph, 0); if (err) @@ -431,6 +438,7 @@ quit(struct weston_launch *wl, int status) err, pam_strerror(wl->ph, err)); pam_end(wl->ph, err); } +#endif if (ioctl(wl->tty, KDSKBMUTE, 0) && ioctl(wl->tty, KDSKBMODE, wl->kb_mode)) @@ -610,6 +618,7 @@ setup_session(struct weston_launch *wl, char **child_argv) setenv("HOME", wl->pw->pw_dir, 1); setenv("SHELL", wl->pw->pw_shell, 1); +#ifdef HAVE_PAM env = pam_getenvlist(wl->ph); if (env) { for (i = 0; env[i]; ++i) { @@ -618,6 +627,7 @@ setup_session(struct weston_launch *wl, char **child_argv) } free(env); } +#endif /* * We open a new session, so it makes sense @@ -685,8 +695,10 @@ static void help(const char *name) { fprintf(stderr, "Usage: %s [args...] [-- [weston args..]]\n", name); +#ifdef HAVE_PAM fprintf(stderr, " -u, --user Start session as specified username,\n" " e.g. -u joe, requires root.\n"); +#endif fprintf(stderr, " -t, --tty Start session on alternative tty,\n" " e.g. -t /dev/tty4, requires -u option.\n"); fprintf(stderr, " -v, --verbose Be verbose\n"); @@ -700,7 +712,9 @@ main(int argc, char *argv[]) int i, c; char *tty = NULL; struct option opts[] = { +#ifdef HAVE_PAM { "user", required_argument, NULL, 'u' }, +#endif { "tty", required_argument, NULL, 't' }, { "verbose", no_argument, NULL, 'v' }, { "help", no_argument, NULL, 'h' }, @@ -712,9 +726,13 @@ main(int argc, char *argv[]) while ((c = getopt_long(argc, argv, "u:t:vh", opts, &i)) != -1) { switch (c) { case 'u': +#ifdef HAVE_PAM wl.new_user = optarg; if (getuid() != 0) error(1, 0, "Permission denied. -u allowed for root only"); +#else + error(1, 0, "-u is unsupported in this weston-launch build"); +#endif break; case 't': tty = optarg; @@ -755,8 +773,10 @@ main(int argc, char *argv[]) if (setup_tty(&wl, tty) < 0) exit(EXIT_FAILURE); +#ifdef HAVE_PAM if (wl.new_user && setup_pam(&wl) < 0) exit(EXIT_FAILURE); +#endif if (setup_launcher_socket(&wl) < 0) exit(EXIT_FAILURE);