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 "system/time.h"
25 #include "auth/auth.h"
26 #include "lib/ldb/include/ldb.h"
27 #include "lib/ldb/include/ldb_errors.h"
29 #include "dsdb/samdb/samdb.h"
32 connect to the schannel ldb
34 static struct ldb_context *schannel_db_connect(TALLOC_CTX *mem_ctx)
37 struct ldb_context *ldb;
39 const char *init_ldif =
41 "computerName: CASE_INSENSITIVE\n" \
42 "flatname: CASE_INSENSITIVE\n";
44 path = smbd_tmp_path(mem_ctx, "schannel.ldb");
49 existed = file_exists(path);
51 ldb = ldb_wrap_connect(mem_ctx, path, system_session(mem_ctx),
52 NULL, LDB_FLG_NOSYNC, NULL);
59 gendb_add_ldif(ldb, init_ldif);
66 remember an established session key for a netr server authentication
67 use a simple ldb structure
69 NTSTATUS schannel_store_session_key(TALLOC_CTX *mem_ctx,
70 struct creds_CredentialState *creds)
72 struct ldb_context *ldb;
73 struct ldb_message *msg;
74 struct ldb_val val, seed;
79 ldb = schannel_db_connect(mem_ctx);
81 return NT_STATUS_NO_MEMORY;
84 f = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->negotiate_flags);
88 return NT_STATUS_NO_MEMORY;
91 sct = talloc_asprintf(mem_ctx, "%u", (unsigned int)creds->secure_channel_type);
95 return NT_STATUS_NO_MEMORY;
98 msg = ldb_msg_new(ldb);
101 return NT_STATUS_NO_MEMORY;
104 msg->dn = ldb_dn_build_child(msg, "computerName", creds->computer_name, NULL);
105 if (msg->dn == NULL) {
107 return NT_STATUS_NO_MEMORY;
110 val.data = creds->session_key;
111 val.length = sizeof(creds->session_key);
113 seed.data = creds->seed.data;
114 seed.length = sizeof(creds->seed.data);
116 ldb_msg_add_string(msg, "objectClass", "schannelState");
117 ldb_msg_add_value(msg, "sessionKey", &val);
118 ldb_msg_add_value(msg, "seed", &seed);
119 ldb_msg_add_string(msg, "negotiateFlags", f);
120 ldb_msg_add_string(msg, "secureChannelType", sct);
121 ldb_msg_add_string(msg, "accountName", creds->account_name);
122 ldb_msg_add_string(msg, "computerName", creds->computer_name);
123 ldb_msg_add_string(msg, "flatname", creds->domain);
124 samdb_msg_add_dom_sid(ldb, mem_ctx, msg, "objectSid", creds->sid);
126 ret = ldb_transaction_start(ldb);
128 DEBUG(0,("Unable to start transaction to add %s to session key db - %s\n",
129 ldb_dn_linearize(msg, msg->dn), ldb_errstring(ldb)));
131 return NT_STATUS_INTERNAL_DB_CORRUPTION;
134 ldb_delete(ldb, msg->dn);
136 ret = ldb_add(ldb, msg);
139 DEBUG(0,("Unable to add %s to session key db - %s\n",
140 ldb_dn_linearize(msg, msg->dn), ldb_errstring(ldb)));
142 return NT_STATUS_INTERNAL_DB_CORRUPTION;
145 ret = ldb_transaction_commit(ldb);
148 DEBUG(0,("Unable to commit adding %s to session key db - %s\n",
149 ldb_dn_linearize(msg, msg->dn), ldb_errstring(ldb)));
151 return NT_STATUS_INTERNAL_DB_CORRUPTION;
161 read back a credentials back for a computer
163 NTSTATUS schannel_fetch_session_key(TALLOC_CTX *mem_ctx,
164 const char *computer_name,
166 struct creds_CredentialState **creds)
168 struct ldb_context *ldb;
169 struct ldb_result *res;
171 const struct ldb_val *val;
174 *creds = talloc_zero(mem_ctx, struct creds_CredentialState);
176 return NT_STATUS_NO_MEMORY;
179 ldb = schannel_db_connect(mem_ctx);
181 return NT_STATUS_NO_MEMORY;
184 expr = talloc_asprintf(mem_ctx, "(&(computerName=%s)(flatname=%s))", computer_name, domain);
187 return NT_STATUS_NO_MEMORY;
190 ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res);
191 if (ret != LDB_SUCCESS || res->count != 1) {
193 return NT_STATUS_INVALID_HANDLE;
196 val = ldb_msg_find_ldb_val(res->msgs[0], "sessionKey");
197 if (val == NULL || val->length != 16) {
198 DEBUG(1,("schannel: record in schannel DB must contain a sessionKey of length 16, when searching for client: %s\n", computer_name));
200 return NT_STATUS_INTERNAL_ERROR;
203 memcpy((*creds)->session_key, val->data, 16);
205 val = ldb_msg_find_ldb_val(res->msgs[0], "seed");
206 if (val == NULL || val->length != 8) {
207 DEBUG(1,("schannel: record in schannel DB must contain a vaid seed of length 8, when searching for client: %s\n", computer_name));
209 return NT_STATUS_INTERNAL_ERROR;
212 memcpy((*creds)->seed.data, val->data, 8);
214 (*creds)->negotiate_flags = ldb_msg_find_int(res->msgs[0], "negotiateFlags", 0);
216 (*creds)->secure_channel_type = ldb_msg_find_int(res->msgs[0], "secureChannelType", 0);
218 (*creds)->account_name = talloc_reference(*creds, ldb_msg_find_string(res->msgs[0], "accountName", NULL));
220 (*creds)->computer_name = talloc_reference(*creds, ldb_msg_find_string(res->msgs[0], "computerName", NULL));
222 (*creds)->domain = talloc_reference(*creds, ldb_msg_find_string(res->msgs[0], "flatname", NULL));
224 (*creds)->sid = samdb_result_dom_sid(*creds, res->msgs[0], "objectSid");