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 "smb_signing.h"
27 /***********************************************************
28 Called to validate an incoming packet from the client.
29 ************************************************************/
31 bool srv_check_sign_mac(struct smbd_server_connection *conn,
32 const char *inbuf, uint32_t *seqnum,
35 /* Check if it's a non-session message. */
40 if (trusted_channel) {
43 if (smb_len(inbuf) < (smb_ss_field + 8 - 4)) {
44 DEBUG(1,("smb_signing_check_pdu: Can't check signature "
45 "on short packet! smb_len = %u\n",
50 status = NT_STATUS(IVAL(inbuf, smb_ss_field + 4));
51 if (!NT_STATUS_IS_OK(status)) {
52 DEBUG(1,("smb_signing_check_pdu: trusted channel passed %s\n",
57 *seqnum = IVAL(inbuf, smb_ss_field);
61 *seqnum = smb_signing_next_seqnum(conn->smb1.signing_state, false);
62 return smb_signing_check_pdu(conn->smb1.signing_state,
63 (const uint8_t *)inbuf,
67 /***********************************************************
68 Called to sign an outgoing packet to the client.
69 ************************************************************/
71 void srv_calculate_sign_mac(struct smbd_server_connection *conn,
72 char *outbuf, uint32_t seqnum)
74 /* Check if it's a non-session message. */
79 smb_signing_sign_pdu(conn->smb1.signing_state, (uint8_t *)outbuf, seqnum);
83 /***********************************************************
84 Called to indicate a oneway request
85 ************************************************************/
86 void srv_cancel_sign_response(struct smbd_server_connection *conn)
88 smb_signing_cancel_reply(conn->smb1.signing_state, true);
91 struct smbd_shm_signing {
95 /* we know the signing engine will only allocate 2 chunks */
102 static int smbd_shm_signing_destructor(struct smbd_shm_signing *s)
104 anonymous_shared_free(s->shm_pointer);
108 static void *smbd_shm_signing_alloc(TALLOC_CTX *mem_ctx, size_t len)
110 struct smbd_shm_signing *s = talloc_get_type_abort(mem_ctx,
111 struct smbd_shm_signing);
113 if (s->ptr1 == NULL) {
116 s->len1 += (8 - (len % 8));
118 if (s->len1 > s->shm_size) {
123 s->ptr1 = s->shm_pointer;
127 if (s->ptr2 == NULL) {
129 if (s->len2 > (s->shm_size - s->len1)) {
134 s->ptr2 = s->shm_pointer + s->len1;
142 static void smbd_shm_signing_free(TALLOC_CTX *mem_ctx, void *ptr)
144 struct smbd_shm_signing *s = talloc_get_type_abort(mem_ctx,
145 struct smbd_shm_signing);
147 if (s->ptr2 == ptr) {
153 /***********************************************************
154 Called by server negprot when signing has been negotiated.
155 ************************************************************/
157 bool srv_init_signing(struct smbd_server_connection *conn)
160 bool mandatory = false;
162 switch (lp_server_signing()) {
175 if (lp_async_smb_echo_handler()) {
176 struct smbd_shm_signing *s;
178 /* setup the signing state in shared memory */
179 s = talloc_zero(smbd_event_context(), struct smbd_shm_signing);
185 (uint8_t *)anonymous_shared_allocate(s->shm_size);
186 if (s->shm_pointer == NULL) {
190 talloc_set_destructor(s, smbd_shm_signing_destructor);
191 conn->smb1.signing_state = smb_signing_init_ex(s,
193 smbd_shm_signing_alloc,
194 smbd_shm_signing_free);
195 if (!conn->smb1.signing_state) {
201 conn->smb1.signing_state = smb_signing_init(smbd_event_context(),
203 if (!conn->smb1.signing_state) {
210 void srv_set_signing_negotiated(struct smbd_server_connection *conn)
212 smb_signing_set_negotiated(conn->smb1.signing_state);
215 /***********************************************************
216 Returns whether signing is active. We can't use sendfile or raw
217 reads/writes if it is.
218 ************************************************************/
220 bool srv_is_signing_active(struct smbd_server_connection *conn)
222 return smb_signing_is_active(conn->smb1.signing_state);
226 /***********************************************************
227 Returns whether signing is negotiated. We can't use it unless it was
229 ************************************************************/
231 bool srv_is_signing_negotiated(struct smbd_server_connection *conn)
233 return smb_signing_is_negotiated(conn->smb1.signing_state);
236 /***********************************************************
237 Turn on signing from this packet onwards.
238 ************************************************************/
240 void srv_set_signing(struct smbd_server_connection *conn,
241 const DATA_BLOB user_session_key,
242 const DATA_BLOB response)
247 if (!user_session_key.length)
250 negotiated = smb_signing_is_negotiated(conn->smb1.signing_state);
251 mandatory = smb_signing_is_mandatory(conn->smb1.signing_state);
253 if (!negotiated && !mandatory) {
254 DEBUG(5,("srv_set_signing: signing negotiated = %u, "
255 "mandatory_signing = %u. Not allowing smb signing.\n",
256 negotiated, mandatory));
260 if (!smb_signing_activate(conn->smb1.signing_state,
261 user_session_key, response)) {
265 DEBUG(3,("srv_set_signing: turning on SMB signing: "
266 "signing negotiated = %u, mandatory_signing = %u.\n",
267 negotiated, mandatory));