2 Unix SMB/CIFS implementation.
4 Copyright (C) Jeremy Allison 2003.
5 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
6 Copyright (C) Stefan Metzmacher 2009
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 3 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, see <http://www.gnu.org/licenses/>.
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "../libcli/smb/smb_signing.h"
26 #include "lib/param/param.h"
28 /***********************************************************
29 Called to validate an incoming packet from the client.
30 ************************************************************/
32 bool srv_check_sign_mac(struct smbXsrv_connection *conn,
33 const char *inbuf, uint32_t *seqnum,
39 /* Check if it's a non-session message. */
45 inhdr = (const uint8_t *)inbuf + NBT_HDR_SIZE;
47 if (trusted_channel) {
50 if (len < (HDR_SS_FIELD + 8)) {
51 DEBUG(1,("smb_signing_check_pdu: Can't check signature "
52 "on short packet! smb_len = %u\n",
57 status = NT_STATUS(IVAL(inhdr, HDR_SS_FIELD + 4));
58 if (!NT_STATUS_IS_OK(status)) {
59 DEBUG(1,("smb_signing_check_pdu: trusted channel passed %s\n",
64 *seqnum = IVAL(inhdr, HDR_SS_FIELD);
68 *seqnum = smb_signing_next_seqnum(conn->smb1.signing_state, false);
69 return smb_signing_check_pdu(conn->smb1.signing_state,
74 /***********************************************************
75 Called to sign an outgoing packet to the client.
76 ************************************************************/
78 NTSTATUS srv_calculate_sign_mac(struct smbXsrv_connection *conn,
79 char *outbuf, uint32_t seqnum)
84 /* Check if it's a non-session message. */
89 len = smb_len(outbuf);
90 outhdr = (uint8_t *)outbuf + NBT_HDR_SIZE;
92 return smb_signing_sign_pdu(conn->smb1.signing_state,
99 /***********************************************************
100 Called to indicate a oneway request
101 ************************************************************/
102 void srv_cancel_sign_response(struct smbXsrv_connection *conn)
104 smb_signing_cancel_reply(conn->smb1.signing_state, true);
107 struct smbd_shm_signing {
109 uint8_t *shm_pointer;
111 /* we know the signing engine will only allocate 2 chunks */
118 static int smbd_shm_signing_destructor(struct smbd_shm_signing *s)
120 anonymous_shared_free(s->shm_pointer);
124 static void *smbd_shm_signing_alloc(TALLOC_CTX *mem_ctx, size_t len)
126 struct smbd_shm_signing *s = talloc_get_type_abort(mem_ctx,
127 struct smbd_shm_signing);
129 if (s->ptr1 == NULL) {
132 s->len1 += (8 - (len % 8));
134 if (s->len1 > s->shm_size) {
139 s->ptr1 = s->shm_pointer;
143 if (s->ptr2 == NULL) {
145 if (s->len2 > (s->shm_size - s->len1)) {
150 s->ptr2 = s->shm_pointer + s->len1;
158 static void smbd_shm_signing_free(TALLOC_CTX *mem_ctx, void *ptr)
160 struct smbd_shm_signing *s = talloc_get_type_abort(mem_ctx,
161 struct smbd_shm_signing);
163 if (s->ptr2 == ptr) {
169 /***********************************************************
170 Called by server negprot when signing has been negotiated.
171 ************************************************************/
173 bool srv_init_signing(struct smbXsrv_connection *conn)
177 bool mandatory = false;
179 struct loadparm_context *lp_ctx = loadparm_init_s3(conn, loadparm_s3_helpers());
180 if (lp_ctx == NULL) {
181 DEBUG(10, ("loadparm_init_s3 failed\n"));
186 * if the client and server allow signing,
187 * we desire to use it.
189 * This matches Windows behavior and is needed
190 * because not every client that requires signing
191 * sends FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED.
193 * Note that we'll always allow signing if the client
194 * does send FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED.
197 desired = lpcfg_server_signing_allowed(lp_ctx, &mandatory);
198 talloc_unlink(conn, lp_ctx);
200 if (lp_async_smb_echo_handler()) {
201 struct smbd_shm_signing *s;
203 /* setup the signing state in shared memory */
204 s = talloc_zero(conn, struct smbd_shm_signing);
210 (uint8_t *)anonymous_shared_allocate(s->shm_size);
211 if (s->shm_pointer == NULL) {
215 talloc_set_destructor(s, smbd_shm_signing_destructor);
216 conn->smb1.signing_state = smb_signing_init_ex(s,
217 allowed, desired, mandatory,
218 smbd_shm_signing_alloc,
219 smbd_shm_signing_free);
220 if (!conn->smb1.signing_state) {
226 conn->smb1.signing_state = smb_signing_init(conn,
227 allowed, desired, mandatory);
228 if (!conn->smb1.signing_state) {
235 void srv_set_signing_negotiated(struct smbXsrv_connection *conn,
236 bool allowed, bool mandatory)
238 smb_signing_set_negotiated(conn->smb1.signing_state,
242 /***********************************************************
243 Returns whether signing is active. We can't use sendfile or raw
244 reads/writes if it is.
245 ************************************************************/
247 bool srv_is_signing_active(struct smbXsrv_connection *conn)
249 return smb_signing_is_active(conn->smb1.signing_state);
253 /***********************************************************
254 Returns whether signing is negotiated. We can't use it unless it was
256 ************************************************************/
258 bool srv_is_signing_negotiated(struct smbXsrv_connection *conn)
260 return smb_signing_is_negotiated(conn->smb1.signing_state);
263 /***********************************************************
264 Turn on signing from this packet onwards.
265 ************************************************************/
267 void srv_set_signing(struct smbXsrv_connection *conn,
268 const DATA_BLOB user_session_key,
269 const DATA_BLOB response)
274 if (!user_session_key.length)
277 negotiated = smb_signing_is_negotiated(conn->smb1.signing_state);
278 mandatory = smb_signing_is_mandatory(conn->smb1.signing_state);
280 if (!negotiated && !mandatory) {
281 DEBUG(5,("srv_set_signing: signing negotiated = %u, "
282 "mandatory_signing = %u. Not allowing smb signing.\n",
283 negotiated, mandatory));
287 if (!smb_signing_activate(conn->smb1.signing_state,
288 user_session_key, response)) {
292 DEBUG(3,("srv_set_signing: turning on SMB signing: "
293 "signing negotiated = %u, mandatory_signing = %u.\n",
294 negotiated, mandatory));