r1015: commit the schannel session key handling code now, so abartlet and

metze can have a look. Not tested yet, as I'm still writing the server
side schannel code.
(This used to be commit 768cc0193a1267274f297c47a36bef4acd391e83)

1 files changed, 143 insertions, 0 deletions

diff --git a/source4/rpc_server/netlogon/schannel_state.c b/source4/rpc_server/netlogon/schannel_state.c
new file mode 100644
index 0000000000..f4190f21b4
--- /dev/null
+++ b/source4/rpc_server/netlogon/schannel_state.c
@@ -0,0 +1,143 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   module to store/fetch session keys for the schannel server
+
+   Copyright (C) Andrew Tridgell 2004
+   
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/* a reasonable amount of time to keep credentials live */
+#define SCHANNEL_CREDENTIALS_EXPIRY 600
+
+/*
+  connect to the schannel ldb
+*/
+static struct ldb_context *schannel_db_connect(TALLOC_CTX *mem_ctx)
+{
+	char *path;
+	struct ldb_context *ldb;
+
+	path = lock_path(mem_ctx, "schannel.ldb");
+	if (!path) {
+		return NULL;
+	}
+	
+	ldb = ldb_connect(path, 0, NULL);
+	if (!ldb) {
+		return NULL;
+	}
+
+	ldb_set_alloc(ldb, talloc_ldb_alloc, mem_ctx);
+	
+	return ldb;
+}
+
+/*
+  remember an established session key for a netr server authentication
+  use a simple ldb structure
+*/
+NTSTATUS schannel_store_session_key(TALLOC_CTX *mem_ctx,
+				    const char *computer_name, struct creds_CredentialState *creds)
+{
+	struct ldb_context *ldb;
+	struct ldb_message msg;
+	struct ldb_val val;
+	char *s = NULL;
+	time_t expiry = time(NULL) + SCHANNEL_CREDENTIALS_EXPIRY;
+	int ret;
+
+	ldb = schannel_db_connect(mem_ctx);
+	if (ldb == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	asprintf(&s, "%u", (unsigned int)expiry);
+
+	if (s == NULL) {
+		ldb_close(ldb);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+
+	ZERO_STRUCT(msg);
+	msg.dn = talloc_strdup(mem_ctx, computer_name);
+	if (msg.dn == NULL) {
+		ldb_close(ldb);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	val.data = creds->session_key;
+	val.length = sizeof(creds->session_key);
+
+	ldb_msg_add_value(ldb, &msg, "sessionKey", &val);
+	ldb_msg_add_string(ldb, &msg, "expiry", s);
+
+	ret = ldb_add(ldb, &msg);
+	ldb_close(ldb);
+
+	if (ret != 0) {
+		return NT_STATUS_INTERNAL_DB_CORRUPTION;
+	}
+
+	return NT_STATUS_OK;
+}
+
+
+/*
+  read back a session key for a computer
+*/
+NTSTATUS schannel_fetch_session_key(TALLOC_CTX *mem_ctx,
+				    const char *computer_name, uint8_t session_key[16])
+{
+	struct ldb_context *ldb;
+	time_t expiry;
+	struct ldb_message **res;
+	int ret;
+	const struct ldb_val *val;
+
+	ldb = schannel_db_connect(mem_ctx);
+	if (ldb == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, "(dn=%s)", NULL, &res);
+	if (ret != 1) {
+		ldb_close(ldb);
+		return NT_STATUS_INVALID_HANDLE;
+	}
+
+	expiry = ldb_msg_find_uint(res[0], "expiry", 0);
+	if (expiry < time(NULL)) {
+		DEBUG(1,("schannel: attempt to use expired session key for %s\n", computer_name));
+		ldb_close(ldb);
+		return NT_STATUS_INVALID_HANDLE;
+	}
+
+	val = ldb_msg_find_ldb_val(res[0], "sessionKey");
+	if (val == NULL || val->length != 16) {
+		ldb_close(ldb);
+		return NT_STATUS_INVALID_HANDLE;
+	}
+
+	memcpy(session_key, val->data, 16);
+
+	ldb_close(ldb);
+
+	return NT_STATUS_OK;
+}