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From d02226b3d5872b184c1d50c7f4706ac9467ffb81 Mon Sep 17 00:00:00 2001
From: Tom Hochstein <tom.hochstein@nxp.com>
Date: Fri, 15 Jul 2016 11:00:15 +0300
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 <tom.hochstein@nxp.com>
---
configure.ac | 9 +++++++--
src/weston-launch.c | 20 ++++++++++++++++++++
2 files changed, 27 insertions(+), 2 deletions(-)
diff --git a/configure.ac b/configure.ac
index 32fdde7..240966f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -416,13 +416,17 @@ 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")
@@ -673,6 +677,7 @@ 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/src/weston-launch.c b/src/weston-launch.c
index b8b2ba0..a865061 100644
--- a/src/weston-launch.c
+++ b/src/weston-launch.c
@@ -51,7 +51,9 @@
#include <pwd.h>
#include <grp.h>
+#ifdef HAVE_PAM
#include <security/pam_appl.h>
+#endif
#ifdef HAVE_SYSTEMD_LOGIN
#include <systemd/sd-login.h>
@@ -93,8 +95,10 @@ 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];
@@ -181,6 +185,7 @@ 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,
@@ -221,6 +226,7 @@ setup_pam(struct weston_launch *wl)
return 0;
}
+#endif
static int
setup_launcher_socket(struct weston_launch *wl)
@@ -414,6 +420,7 @@ 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)
@@ -421,6 +428,7 @@ 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))
@@ -600,6 +608,7 @@ setup_session(struct weston_launch *wl)
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) {
@@ -608,6 +617,7 @@ setup_session(struct weston_launch *wl)
}
free(env);
}
+#endif
}
static void
@@ -665,7 +675,9 @@ 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");
+#endif
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");
@@ -678,7 +690,9 @@ 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' },
@@ -690,9 +704,13 @@ 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;
@@ -730,8 +748,10 @@ 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);
--
2.1.4
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