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Wrap calls to plugin event callbacks to use the plugin's debug instance.

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Otherwise, the debug output in a plugin's event callback will go
to the sudo debug file, not sudoers.
This commit is contained in:
Todd C. Miller
2020-01-15 14:05:08 -07:00
parent 41242e121f
commit 405d26f5b8
2 changed files with 30 additions and 2 deletions
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27
src/sudo.c
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@@ -1357,6 +1357,21 @@ iolog_unlink(struct plugin_container *plugin)
debug_return;
}
static void
plugin_event_callback(int fd, int what, void *v)
{
struct sudo_plugin_event_int *ev_int = v;
int old_instance;
debug_decl(plugin_event_callback, SUDO_DEBUG_PCOMM);
/* Run the real callback using the plugin's debug instance. */
old_instance = sudo_debug_set_active_instance(ev_int->debug_instance);
ev_int->callback(fd, what, ev_int->closure);
sudo_debug_set_active_instance(old_instance);
debug_return;
}
/*
* Fill in a previously allocated struct sudo_plugin_event.
*/
@@ -1368,9 +1383,16 @@ plugin_event_set(struct sudo_plugin_event *pev, int fd, int events,
debug_decl(plugin_event_set, SUDO_DEBUG_PCOMM);
ev_int = __containerof(pev, struct sudo_plugin_event_int, public);
if (sudo_ev_set(&ev_int->private, fd, events, callback, closure) == -1)
if (sudo_ev_set(&ev_int->private, fd, events, plugin_event_callback, ev_int) == -1)
debug_return_int(-1);
/* Stash active instance so we can restore it when callback runs. */
ev_int->debug_instance = sudo_debug_get_active_instance();
/* Actual user-specified callback and closure. */
ev_int->callback = callback;
ev_int->closure = closure;
/* Plugin can only operate on the main event loop. */
ev_int->private.base = sudo_event_base;
@@ -1503,6 +1525,9 @@ sudo_plugin_event_alloc(void)
ev_int->public.loopbreak = plugin_event_loopbreak;
ev_int->public.free = plugin_event_free;
/* Debug instance to use with the callback. */
ev_int->debug_instance = SUDO_DEBUG_INSTANCE_INITIALIZER;
/* Clear private portion in case caller tries to use us uninitialized. */
memset(&ev_int->private, 0, sizeof(ev_int->private));