s3: smbcontrol to notify smbd about idmap changes

Autobuild-User: Michael Adam <obnox@samba.org>
Autobuild-Date: Mon Feb 28 14:07:23 CET 2011 on sn-devel-104

1 files changed, 205 insertions, 0 deletions

diff --git a/source3/smbd/msg_idmap.c b/source3/smbd/msg_idmap.c
new file mode 100644
index 0000000000..9e2424d45e
--- /dev/null
+++ b/source3/smbd/msg_idmap.c
@@ -0,0 +1,205 @@
+/*
+ * 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 "memcache.h"
+#include "globals.h"
+#include "../libcli/security/dom_sid.h"
+#include "../librpc/gen_ndr/messaging.h"
+#include "../librpc/gen_ndr/ndr_security.h"
+#include "idmap_cache.h"
+
+struct id {
+	union {
+		uid_t uid;
+		gid_t gid;
+		struct dom_sid sid;
+	};
+	enum {UID, GID, SID} type;
+};
+
+static bool parse_id(const char* str, struct id* 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->gid = ul;
+			id->type = GID;
+			return true;
+		case 'U':
+			id->uid = ul;
+			id->type = UID;
+			return true;
+		default:
+			break;
+		}
+	} else if (string_to_sid(&sid, str)) {
+		id->sid = sid;
+		id->type = SID;
+		return true;
+	}
+	return false;
+}
+
+static bool uid_in_use(const struct user_struct* user, uid_t uid)
+{
+	while (user) {
+		if (user->session_info && (user->session_info->utok.uid == uid)) {
+			return true;
+		}
+		user = user->next;
+	}
+	return false;
+}
+
+static bool gid_in_use(const struct user_struct* user, gid_t gid)
+{
+	while (user) {
+		if (user->session_info != NULL) {
+			int i;
+			struct unix_user_token utok = user->session_info->utok;
+			if (utok.gid == gid) {
+				return true;
+			}
+			for(i=0; i<utok.ngroups; i++) {
+				if (utok.groups[i] == gid) {
+					return true;
+				}
+			}
+		}
+		user = user->next;
+	}
+	return false;
+}
+
+static bool sid_in_use(const struct user_struct* user, const struct dom_sid* psid)
+{
+	uid_t uid;
+	gid_t gid;
+	if (sid_to_gid(psid, &gid)) {
+		return gid_in_use(user, gid);
+	} else if (sid_to_uid(psid, &uid)) {
+		return uid_in_use(user, uid);
+	}
+	return false;
+}
+
+
+static bool id_in_use(const struct user_struct* user, const struct id* id)
+{
+	switch(id->type) {
+	case UID:
+		return uid_in_use(user, id->uid);
+	case GID:
+		return gid_in_use(user, id->gid);
+	case SID:
+		return sid_in_use(user, &id->sid);
+	default:
+		break;
+	}
+	return false;
+}
+
+static void delete_from_cache(const struct id* id)
+{
+	switch(id->type) {
+	case UID:
+		delete_uid_cache(id->uid);
+		idmap_cache_del_uid(id->uid);
+		break;
+	case GID:
+		delete_gid_cache(id->gid);
+		idmap_cache_del_gid(id->gid);
+		break;
+	case SID:
+		delete_sid_cache(&id->sid);
+		idmap_cache_del_sid(&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;
+
+	DEBUG(0, ("Foo: idmap flush cache message(0x%.2x): %s\n", msg_type, msg ? msg : "<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>";
+	bool do_kill = (msg_type == MSG_IDMAP_KILL);
+	struct user_struct* validated_users = smbd_server_conn->smb1.sessions.validated_users;
+	struct id id;
+
+	DEBUG(0, ("Foo: idmap delete message(0x%.2x): %s\n", msg_type, msg));
+
+	if (!parse_id(msg, &id)) {
+		DEBUG(0, ("Invalid ?ID: %s\n", msg));
+		return;
+	}
+
+	if( do_kill && id_in_use(validated_users, &id) ) {
+		exit_server_cleanly(msg);
+	} else {
+		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);
+	messaging_register(ctx, NULL, MSG_IDMAP_KILL,   message_idmap_delete);
+}