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core-util: Fail if XDG_RUNTIME_DIR belongs to someone else

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Usually, PA will use the PULSE_SERVER X11 property instead of using XDG_RUNTIME_DIR,
so this environment variable does not matter.

If this property is not available, or if one is using the pacmd cli protocol,
the client will go ahead and call pa_make_secure_dir on XDG_RUNTIME_DIR/pulse.
This will either fail (if you're another regular user), or succeed (if you're root).
Both scenarios are bad - failing will cause the connection to fail, and succeeding
is even worse, as it can cause *other* connections to fail (as the directory
ownership has changed).

Instead fail and complain loudly.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=83007
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2013-11-12 07:52:48 +01:00
parent b8656afe4a
commit 076601ee28
1 changed files with 8 additions and 0 deletions
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8
src/pulsecore/core-util.c
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@ -1816,6 +1816,14 @@ char *pa_get_runtime_dir(void) {
/* Use the XDG standard for the runtime directory. */
d = getenv("XDG_RUNTIME_DIR");
if (d) {
struct stat st;
if (stat(d, &st) == 0 && st.st_uid != getuid()) {
pa_log(_("XDG_RUNTIME_DIR (%s) is not owned by us (uid %d), but by uid %d! "
"(This could e g happen if you try to connect to a non-root PulseAudio as a root user, over the native protocol. Don't do that.)"),
d, getuid(), st.st_uid);
goto fail;
}
k = pa_sprintf_malloc("%s" PA_PATH_SEP "pulse", d);
if (pa_make_secure_dir(k, m, (uid_t) -1, (gid_t) -1, true) < 0) {