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authorAndrew Tridgell <tridge@samba.org>2004-06-05 01:27:02 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 12:56:27 -0500
commitcd35e12c7f96ef5297e78e6cd7a37f118382d722 (patch)
treec85ca76931c2897f79828569e6cb80907395d0d8 /source4/rpc_server/netlogon
parent4ee70616cc25d8b1bfec2c7d0285eb06b35ea873 (diff)
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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)
Diffstat (limited to 'source4/rpc_server/netlogon')
-rw-r--r--source4/rpc_server/netlogon/schannel_state.c143
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;
+}