2 Unix SMB/CIFS implementation.
4 module to store/fetch session keys for the schannel server
6 Copyright (C) Andrew Tridgell 2004
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include "auth/auth.h"
25 #include "lib/ldb/include/ldb.h"
26 #include "lib/ldb/include/ldb_errors.h"
27 #include "dsdb/samdb/samdb.h"
31 connect to the schannel ldb
33 struct ldb_context *schannel_db_connect(TALLOC_CTX *mem_ctx)
36 struct ldb_context *ldb;
38 const char *init_ldif =
40 "computerName: CASE_INSENSITIVE\n" \
41 "flatname: CASE_INSENSITIVE\n";
43 path = smbd_tmp_path(mem_ctx, "schannel.ldb");
48 existed = file_exist(path);
50 ldb = ldb_wrap_connect(mem_ctx, path, system_session(mem_ctx),
51 NULL, LDB_FLG_NOSYNC, NULL);
58 gendb_add_ldif(ldb, init_ldif);
65 remember an established session key for a netr server authentication
66 use a simple ldb structure
68 NTSTATUS schannel_store_session_key_ldb(TALLOC_CTX *mem_ctx,
69 struct ldb_context *ldb,
70 struct creds_CredentialState *creds)
72 struct ldb_message *msg;
73 struct ldb_val val, seed, client_state, server_state;
78 f = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->negotiate_flags);
81 return NT_STATUS_NO_MEMORY;
84 sct = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->secure_channel_type);
87 return NT_STATUS_NO_MEMORY;
90 msg = ldb_msg_new(ldb);
92 return NT_STATUS_NO_MEMORY;
95 msg->dn = ldb_dn_build_child(msg, "computerName", creds->computer_name, NULL);
96 if (msg->dn == NULL) {
97 return NT_STATUS_NO_MEMORY;
100 val.data = creds->session_key;
101 val.length = sizeof(creds->session_key);
103 seed.data = creds->seed.data;
104 seed.length = sizeof(creds->seed.data);
106 client_state.data = creds->client.data;
107 client_state.length = sizeof(creds->client.data);
108 server_state.data = creds->server.data;
109 server_state.length = sizeof(creds->server.data);
111 ldb_msg_add_string(msg, "objectClass", "schannelState");
112 ldb_msg_add_value(msg, "sessionKey", &val, NULL);
113 ldb_msg_add_value(msg, "seed", &seed, NULL);
114 ldb_msg_add_value(msg, "clientState", &client_state, NULL);
115 ldb_msg_add_value(msg, "serverState", &server_state, NULL);
116 ldb_msg_add_string(msg, "negotiateFlags", f);
117 ldb_msg_add_string(msg, "secureChannelType", sct);
118 ldb_msg_add_string(msg, "accountName", creds->account_name);
119 ldb_msg_add_string(msg, "computerName", creds->computer_name);
120 ldb_msg_add_string(msg, "flatname", creds->domain);
121 samdb_msg_add_dom_sid(ldb, mem_ctx, msg, "objectSid", creds->sid);
123 ldb_delete(ldb, msg->dn);
125 ret = ldb_add(ldb, msg);
128 DEBUG(0,("Unable to add %s to session key db - %s\n",
129 ldb_dn_linearize(msg, msg->dn), ldb_errstring(ldb)));
130 return NT_STATUS_INTERNAL_DB_CORRUPTION;
136 NTSTATUS schannel_store_session_key(TALLOC_CTX *mem_ctx,
137 struct creds_CredentialState *creds)
139 struct ldb_context *ldb;
143 ldb = schannel_db_connect(mem_ctx);
145 return NT_STATUS_ACCESS_DENIED;
148 ret = ldb_transaction_start(ldb);
151 return NT_STATUS_INTERNAL_DB_CORRUPTION;
154 nt_status = schannel_store_session_key_ldb(mem_ctx, ldb, creds);
156 if (NT_STATUS_IS_OK(nt_status)) {
157 ret = ldb_transaction_commit(ldb);
159 ret = ldb_transaction_cancel(ldb);
163 DEBUG(0,("Unable to commit adding credentials for %s to schannel key db - %s\n",
164 creds->computer_name, ldb_errstring(ldb)));
166 return NT_STATUS_INTERNAL_DB_CORRUPTION;
174 read back a credentials back for a computer
176 NTSTATUS schannel_fetch_session_key_ldb(TALLOC_CTX *mem_ctx,
177 struct ldb_context *ldb,
178 const char *computer_name,
180 struct creds_CredentialState **creds)
182 struct ldb_result *res;
184 const struct ldb_val *val;
187 *creds = talloc_zero(mem_ctx, struct creds_CredentialState);
189 return NT_STATUS_NO_MEMORY;
192 expr = talloc_asprintf(mem_ctx, "(&(computerName=%s)(flatname=%s))",
193 computer_name, domain);
195 return NT_STATUS_NO_MEMORY;
198 ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res);
200 if (ret != LDB_SUCCESS) {
201 DEBUG(3,("schannel: Failed to find a record for client %s: %s\n", computer_name, ldb_errstring(ldb)));
203 return NT_STATUS_INVALID_HANDLE;
205 talloc_steal(mem_ctx, res);
206 if (res->count != 1) {
207 DEBUG(3,("schannel: Failed to find a record for client: %s (found %d records)\n", computer_name, res->count));
209 return NT_STATUS_INVALID_HANDLE;
212 val = ldb_msg_find_ldb_val(res->msgs[0], "sessionKey");
213 if (val == NULL || val->length != 16) {
214 DEBUG(1,("schannel: record in schannel DB must contain a sessionKey of length 16, when searching for client: %s\n", computer_name));
216 return NT_STATUS_INTERNAL_ERROR;
219 memcpy((*creds)->session_key, val->data, 16);
221 val = ldb_msg_find_ldb_val(res->msgs[0], "seed");
222 if (val == NULL || val->length != 8) {
223 DEBUG(1,("schannel: record in schannel DB must contain a vaid seed of length 8, when searching for client: %s\n", computer_name));
225 return NT_STATUS_INTERNAL_ERROR;
228 memcpy((*creds)->seed.data, val->data, 8);
230 val = ldb_msg_find_ldb_val(res->msgs[0], "clientState");
231 if (val == NULL || val->length != 8) {
232 DEBUG(1,("schannel: record in schannel DB must contain a vaid clientState of length 8, when searching for client: %s\n", computer_name));
234 return NT_STATUS_INTERNAL_ERROR;
236 memcpy((*creds)->client.data, val->data, 8);
238 val = ldb_msg_find_ldb_val(res->msgs[0], "serverState");
239 if (val == NULL || val->length != 8) {
240 DEBUG(1,("schannel: record in schannel DB must contain a vaid serverState of length 8, when searching for client: %s\n", computer_name));
242 return NT_STATUS_INTERNAL_ERROR;
244 memcpy((*creds)->server.data, val->data, 8);
246 (*creds)->negotiate_flags = ldb_msg_find_attr_as_int(res->msgs[0], "negotiateFlags", 0);
248 (*creds)->secure_channel_type = ldb_msg_find_attr_as_int(res->msgs[0], "secureChannelType", 0);
250 (*creds)->account_name = talloc_strdup(*creds, ldb_msg_find_attr_as_string(res->msgs[0], "accountName", NULL));
251 if ((*creds)->account_name == NULL) {
253 return NT_STATUS_NO_MEMORY;
256 (*creds)->computer_name = talloc_strdup(*creds, ldb_msg_find_attr_as_string(res->msgs[0], "computerName", NULL));
257 if ((*creds)->computer_name == NULL) {
259 return NT_STATUS_NO_MEMORY;
262 (*creds)->domain = talloc_strdup(*creds, ldb_msg_find_attr_as_string(res->msgs[0], "flatname", NULL));
263 if ((*creds)->domain == NULL) {
265 return NT_STATUS_NO_MEMORY;
268 (*creds)->sid = samdb_result_dom_sid(*creds, res->msgs[0], "objectSid");
274 NTSTATUS schannel_fetch_session_key(TALLOC_CTX *mem_ctx,
275 const char *computer_name,
277 struct creds_CredentialState **creds)
280 struct ldb_context *ldb;
282 ldb = schannel_db_connect(mem_ctx);
284 return NT_STATUS_ACCESS_DENIED;
287 nt_status = schannel_fetch_session_key_ldb(mem_ctx, ldb,
288 computer_name, domain,