/* -------------------------------------------------------------------------
*
* sepgsql_avc_check_valid
*
* This function checks whether the cached entries are still valid. If
* the security policy has been reloaded (or any other events that requires
* resetting userspace caches has occurred) since the last reference to
* the access vector cache, we must flush the cache.
*
* Access control decisions must be atomic, but multiple system calls may
* be required to make a decision; thus, when referencing the access vector
* cache, we must loop until we complete without an intervening cache flush
* event. In practice, looping even once should be very rare. Callers should
* do something like this:
*
* sepgsql_avc_check_valid();
* do {
* :
* <reference to uavc>
* :
* } while (!sepgsql_avc_check_valid())
*
* -------------------------------------------------------------------------
*/
static bool
sepgsql_avc_check_valid(void)
{
if (selinux_status_updated() > 0)
{
sepgsql_avc_reset();
return false;
}
return true;
}
rpmRC rpmtsSELabelInit(rpmts ts, int open_status)
{
#if WITH_SELINUX
const char * path = selinux_file_context_path();
if (ts == NULL || path == NULL) {
return RPMRC_FAIL;
}
if (open_status) {
selinux_status_close();
if (selinux_status_open(0) < 0) {
return RPMRC_FAIL;
}
} else if (!selinux_status_updated() && ts->selabelHandle) {
return RPMRC_OK;
}
struct selinux_opt opts[] = {
{ .type = SELABEL_OPT_PATH, .value = path}
};
void
dpkg_selabel_load(void)
{
#ifdef WITH_LIBSELINUX
static int selinux_enabled = -1;
if (selinux_enabled < 0) {
int rc;
/* Set selinux_enabled if it is not already set (singleton). */
selinux_enabled = (in_force(FORCE_SECURITY_MAC) &&
is_selinux_enabled() > 0);
if (!selinux_enabled)
return;
/* Open the SELinux status notification channel, with fallback
* enabled for older kernels. */
rc = selinux_status_open(1);
if (rc < 0)
ohshit(_("cannot open security status notification channel"));
/* XXX: We could use selinux_set_callback() to redirect the
* errors from the other SELinux calls, but that does not seem
* worth it right now. */
} else if (selinux_enabled && selinux_status_updated()) {
/* The SELinux policy got updated in the kernel, usually after
* upgrading the package shipping it, we need to reload. */
selabel_close(sehandle);
} else {
/* SELinux is either disabled or it does not need a reload. */
return;
}
sehandle = selabel_open(SELABEL_CTX_FILE, NULL, 0);
if (sehandle == NULL && security_getenforce() == 1)
ohshite(_("cannot get security labeling handle"));
#endif
}
int svcmgr_handler(struct binder_state *bs,
struct binder_transaction_data *txn,
struct binder_io *msg,
struct binder_io *reply)
{
struct svcinfo *si;
uint16_t *s;
size_t len;
uint32_t handle;
uint32_t strict_policy;
int allow_isolated;
//ALOGI("target=%p code=%d pid=%d uid=%d\n",
// (void*) txn->target.ptr, txn->code, txn->sender_pid, txn->sender_euid);
if (txn->target.ptr != BINDER_SERVICE_MANAGER)
return -1;
if (txn->code == PING_TRANSACTION)
return 0;
// Equivalent to Parcel::enforceInterface(), reading the RPC
// header with the strict mode policy mask and the interface name.
// Note that we ignore the strict_policy and don't propagate it
// further (since we do no outbound RPCs anyway).
strict_policy = bio_get_uint32(msg);
s = bio_get_string16(msg, &len);
if (s == NULL) {
return -1;
}
if ((len != (sizeof(svcmgr_id) / 2)) ||
memcmp(svcmgr_id, s, sizeof(svcmgr_id))) {
fprintf(stderr,"invalid id %s\n", str8(s, len));
return -1;
}
if (sehandle && selinux_status_updated() > 0) {
struct selabel_handle *tmp_sehandle = selinux_android_service_context_handle();
if (tmp_sehandle) {
selabel_close(sehandle);
sehandle = tmp_sehandle;
}
}
switch(txn->code) {
case SVC_MGR_GET_SERVICE:
case SVC_MGR_CHECK_SERVICE:
s = bio_get_string16(msg, &len);
if (s == NULL) {
return -1;
}
handle = do_find_service(bs, s, len, txn->sender_euid, txn->sender_pid);
if (!handle)
break;
bio_put_ref(reply, handle);
return 0;
case SVC_MGR_ADD_SERVICE:
s = bio_get_string16(msg, &len);
if (s == NULL) {
return -1;
}
handle = bio_get_ref(msg);
allow_isolated = bio_get_uint32(msg) ? 1 : 0;
if (do_add_service(bs, s, len, handle, txn->sender_euid,
allow_isolated, txn->sender_pid))
return -1;
break;
case SVC_MGR_LIST_SERVICES: {
uint32_t n = bio_get_uint32(msg);
if (!svc_can_list(txn->sender_pid, txn->sender_euid)) {
ALOGE("list_service() uid=%d - PERMISSION DENIED\n",
txn->sender_euid);
return -1;
}
si = svclist;
while ((n-- > 0) && si)
si = si->next;
if (si) {
bio_put_string16(reply, si->name);
return 0;
}
return -1;
}
default:
ALOGE("unknown code %d\n", txn->code);
return -1;
}
bio_put_uint32(reply, 0);
return 0;
}
