s3-id_cache: Move id caches mgmt out of smbd

We must leave the MSG_IDMAP_KILL operation in SMBD as it uses smbd
specific internal globals and makes sense only in the context of a smbd
daemon.
The rest is moved under lib/ as we need to deal with id cache cleanups
in other daemons too (like lsasd).

Signed-off-by: Simo Sorce <idra@samba.org>

2 files changed, 222 insertions, 0 deletions

diff --git a/source3/lib/id_cache.c b/source3/lib/id_cache.c
new file mode 100644
index 0000000000..50649dd409
--- /dev/null
+++ b/source3/lib/id_cache.c
@@ -0,0 +1,190 @@
+/*
+ * Samba Unix/Linux SMB client library
+ *
+ * Copyright (C) Gregor Beck 2011
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @brief  Notify smbd about idmap changes
+ * @file   msg_idmap.c
+ * @author Gregor Beck <gb@sernet.de>
+ * @date   Feb 2011
+ *
+ */
+
+#include "includes.h"
+#include "messages.h"
+#include "lib/id_cache.h"
+#include "include/memcache.h"
+#include "idmap_cache.h"
+#include "../librpc/gen_ndr/ndr_security.h"
+#include "../libcli/security/dom_sid.h"
+
+bool id_cache_ref_parse(const char* str, struct id_cache_ref* id)
+{
+	struct dom_sid sid;
+	unsigned long ul;
+	char c, trash;
+
+	if (sscanf(str, "%cID %lu%c", &c, &ul, &trash) == 2) {
+		switch(c) {
+		case 'G':
+			id->id.gid = ul;
+			id->type = GID;
+			return true;
+		case 'U':
+			id->id.uid = ul;
+			id->type = UID;
+			return true;
+		default:
+			break;
+		}
+	} else if (string_to_sid(&sid, str)) {
+		id->id.sid = sid;
+		id->type = SID;
+		return true;
+	}
+	return false;
+}
+
+static bool delete_uid_cache(uid_t puid)
+{
+	DATA_BLOB uid = data_blob_const(&puid, sizeof(puid));
+	DATA_BLOB sid;
+
+	if (!memcache_lookup(NULL, UID_SID_CACHE, uid, &sid)) {
+		DEBUG(3, ("UID %d is not memcached!\n", (int)puid));
+		return false;
+	}
+	DEBUG(3, ("Delete mapping UID %d <-> %s from memcache\n", (int)puid,
+		  sid_string_dbg((struct dom_sid*)sid.data)));
+	memcache_delete(NULL, SID_UID_CACHE, sid);
+	memcache_delete(NULL, UID_SID_CACHE, uid);
+	return true;
+}
+
+static bool delete_gid_cache(gid_t pgid)
+{
+	DATA_BLOB gid = data_blob_const(&pgid, sizeof(pgid));
+	DATA_BLOB sid;
+	if (!memcache_lookup(NULL, GID_SID_CACHE, gid, &sid)) {
+		DEBUG(3, ("GID %d is not memcached!\n", (int)pgid));
+		return false;
+	}
+	DEBUG(3, ("Delete mapping GID %d <-> %s from memcache\n", (int)pgid,
+		  sid_string_dbg((struct dom_sid*)sid.data)));
+	memcache_delete(NULL, SID_GID_CACHE, sid);
+	memcache_delete(NULL, GID_SID_CACHE, gid);
+	return true;
+}
+
+static bool delete_sid_cache(const struct dom_sid* psid)
+{
+	DATA_BLOB sid = data_blob_const(psid, ndr_size_dom_sid(psid, 0));
+	DATA_BLOB id;
+	if (memcache_lookup(NULL, SID_GID_CACHE, sid, &id)) {
+		DEBUG(3, ("Delete mapping %s <-> GID %d from memcache\n",
+			  sid_string_dbg(psid), *(int*)id.data));
+		memcache_delete(NULL, SID_GID_CACHE, sid);
+		memcache_delete(NULL, GID_SID_CACHE, id);
+	} else if (memcache_lookup(NULL, SID_UID_CACHE, sid, &id)) {
+		DEBUG(3, ("Delete mapping %s <-> UID %d from memcache\n",
+			  sid_string_dbg(psid), *(int*)id.data));
+		memcache_delete(NULL, SID_UID_CACHE, sid);
+		memcache_delete(NULL, UID_SID_CACHE, id);
+	} else {
+		DEBUG(3, ("SID %s is not memcached!\n", sid_string_dbg(psid)));
+		return false;
+	}
+	return true;
+}
+
+static void flush_gid_cache(void)
+{
+	DEBUG(3, ("Flush GID <-> SID memcache\n"));
+	memcache_flush(NULL, SID_GID_CACHE);
+	memcache_flush(NULL, GID_SID_CACHE);
+}
+
+static void flush_uid_cache(void)
+{
+	DEBUG(3, ("Flush UID <-> SID memcache\n"));
+	memcache_flush(NULL, SID_UID_CACHE);
+	memcache_flush(NULL, UID_SID_CACHE);
+}
+static void delete_from_cache(const struct id_cache_ref* id)
+{
+	switch(id->type) {
+	case UID:
+		delete_uid_cache(id->id.uid);
+		idmap_cache_del_uid(id->id.uid);
+		break;
+	case GID:
+		delete_gid_cache(id->id.gid);
+		idmap_cache_del_gid(id->id.gid);
+		break;
+	case SID:
+		delete_sid_cache(&id->id.sid);
+		idmap_cache_del_sid(&id->id.sid);
+		break;
+	default:
+		break;
+	}
+}
+
+
+static void message_idmap_flush(struct messaging_context *msg_ctx,
+				void* private_data,
+				uint32_t msg_type,
+				struct server_id server_id,
+				DATA_BLOB* data)
+{
+	const char *msg = data ? (const char *)data->data : NULL;
+
+	if ((msg == NULL) || (msg[0] == '\0')) {
+		flush_gid_cache();
+		flush_uid_cache();
+	} else if (strncmp(msg, "GID", 3)) {
+		flush_gid_cache();
+	} else if (strncmp(msg, "UID", 3)) {
+		flush_uid_cache();
+	} else {
+		DEBUG(0, ("Invalid argument: %s\n", msg));
+	}
+}
+
+static void message_idmap_delete(struct messaging_context *msg_ctx,
+				 void *private_data,
+				 uint32_t msg_type,
+				 struct server_id server_id,
+				 DATA_BLOB* data)
+{
+	const char *msg = (data && data->data) ? (const char *)data->data : "<NULL>";
+	struct id_cache_ref id;
+
+	if (!id_cache_ref_parse(msg, &id)) {
+		DEBUG(0, ("Invalid ?ID: %s\n", msg));
+		return;
+	}
+
+	delete_from_cache(&id);
+}
+
+void msg_idmap_register_msgs(struct messaging_context *ctx)
+{
+	messaging_register(ctx, NULL, MSG_IDMAP_FLUSH,  message_idmap_flush);
+	messaging_register(ctx, NULL, MSG_IDMAP_DELETE, message_idmap_delete);
+}
diff --git a/source3/lib/id_cache.h b/source3/lib/id_cache.h
new file mode 100644
index 0000000000..fc78f75192
--- /dev/null
+++ b/source3/lib/id_cache.h
@@ -0,0 +1,32 @@
+/*
+ * Samba Unix/Linux SMB client library
+ *
+ * Copyright (C) Gregor Beck 2011
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+struct id_cache_ref {
+	union {
+		uid_t uid;
+		gid_t gid;
+		struct dom_sid sid;
+		const char *name;
+	} id;
+	enum {UID, GID, SID, NAME} type;
+};
+
+bool id_cache_ref_parse(const char* str, struct id_cache_ref* id);
+
+void msg_idmap_register_msgs(struct messaging_context *ctx);