2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 2000-2001, Boris Popov
7 * Copyright (c) 2003, 2004 Tim J. Robbins.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Boris Popov.
21 * 4. Neither the name of the author nor the names of any co-contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/malloc.h>
43 #include <sys/kernel.h>
44 #include <sys/systm.h>
47 #include <sys/fcntl.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/sysctl.h>
51 #include <sys/endian.h>
53 #include <sys/mchain.h>
56 #include <sys/iconv.h>
58 #include <netsmb/smb.h>
59 #include <netsmb/smb_conn.h>
60 #include <netsmb/smb_subr.h>
61 #include <netsmb/smb_rq.h>
62 #include <netsmb/smb_dev.h>
64 #include <crypto/des/des.h>
66 #include "opt_netsmb.h"
68 static u_char N8[] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
72 smb_E(const u_char *key, u_char *data, u_char *dest)
74 des_key_schedule *ksp;
77 kk[0] = key[0] & 0xfe;
78 kk[1] = key[0] << 7 | (key[1] >> 1 & 0xfe);
79 kk[2] = key[1] << 6 | (key[2] >> 2 & 0xfe);
80 kk[3] = key[2] << 5 | (key[3] >> 3 & 0xfe);
81 kk[4] = key[3] << 4 | (key[4] >> 4 & 0xfe);
82 kk[5] = key[4] << 3 | (key[5] >> 5 & 0xfe);
83 kk[6] = key[5] << 2 | (key[6] >> 6 & 0xfe);
85 ksp = malloc(sizeof(des_key_schedule), M_SMBTEMP, M_WAITOK);
86 des_set_key(kk, *ksp);
87 des_ecb_encrypt(data, dest, *ksp, 1);
93 smb_encrypt(const u_char *apwd, u_char *C8, u_char *RN)
95 u_char *p, *P14, *S21;
97 p = malloc(14 + 21, M_SMBTEMP, M_WAITOK);
101 bcopy(apwd, P14, min(14, strlen(apwd)));
103 * S21 = concat(Ex(P14, N8), zeros(5));
106 smb_E(P14 + 7, N8, S21 + 8);
109 smb_E(S21 + 7, C8, RN + 8);
110 smb_E(S21 + 14, C8, RN + 16);
116 smb_ntencrypt(const u_char *apwd, u_char *C8, u_char *RN)
124 unipwd = malloc((len + 1) * sizeof(u_int16_t), M_SMBTEMP, M_WAITOK);
126 * S21 = concat(MD4(U(apwd)), zeros(5));
128 smb_strtouni(unipwd, apwd);
129 ctxp = malloc(sizeof(MD4_CTX), M_SMBTEMP, M_WAITOK);
131 MD4Update(ctxp, (u_char*)unipwd, len * sizeof(u_int16_t));
132 free(unipwd, M_SMBTEMP);
135 free(ctxp, M_SMBTEMP);
138 smb_E(S21 + 7, C8, RN + 8);
139 smb_E(S21 + 14, C8, RN + 16);
144 * Calculate message authentication code (MAC) key for virtual circuit.
147 smb_calcmackey(struct smb_vc *vcp)
153 u_char S16[16], S21[21];
155 KASSERT(vcp->vc_hflags2 & SMB_FLAGS2_SECURITY_SIGNATURE,
156 ("signatures not enabled"));
158 if (vcp->vc_mackey != NULL) {
159 free(vcp->vc_mackey, M_SMBTEMP);
160 vcp->vc_mackey = NULL;
161 vcp->vc_mackeylen = 0;
166 * The partial MAC key is the concatenation of the 16 byte session
167 * key and the 24 byte challenge response.
169 vcp->vc_mackeylen = 16 + 24;
170 vcp->vc_mackey = malloc(vcp->vc_mackeylen, M_SMBTEMP, M_WAITOK);
173 * Calculate session key:
176 pwd = smb_vc_getpass(vcp);
178 unipwd = malloc((len + 1) * sizeof(u_int16_t), M_SMBTEMP, M_WAITOK);
179 smb_strtouni(unipwd, pwd);
181 MD4Update(&md4, (u_char *)unipwd, len * sizeof(u_int16_t));
184 MD4Update(&md4, S16, 16);
185 MD4Final(vcp->vc_mackey, &md4);
186 free(unipwd, M_SMBTEMP);
189 * Calculate response to challenge:
190 * Ex(concat(MD4(U(pass)), zeros(5)), C8)
194 smb_E(S21, vcp->vc_ch, vcp->vc_mackey + 16);
195 smb_E(S21 + 7, vcp->vc_ch, vcp->vc_mackey + 24);
196 smb_E(S21 + 14, vcp->vc_ch, vcp->vc_mackey + 32);
202 * Sign request with MAC.
205 smb_rq_sign(struct smb_rq *rqp)
207 struct smb_vc *vcp = rqp->sr_vc;
213 KASSERT(vcp->vc_hflags2 & SMB_FLAGS2_SECURITY_SIGNATURE,
214 ("signatures not enabled"));
216 if (vcp->vc_mackey == NULL)
217 /* XXX Should assert that cmd == SMB_COM_NEGOTIATE. */
221 * This is a bit of a kludge. If the request is non-TRANSACTION,
222 * or it is the first request of a transaction, give it the next
223 * sequence number, and expect the reply to have the sequence number
224 * following that one. Otherwise, it is a secondary request in
225 * a transaction, and it gets the same sequence numbers as the
228 if (rqp->sr_t2 == NULL ||
229 (rqp->sr_t2->t2_flags & SMBT2_SECONDARY) == 0) {
230 rqp->sr_seqno = vcp->vc_seqno++;
231 rqp->sr_rseqno = vcp->vc_seqno++;
234 * Sequence numbers are already in the struct because
235 * smb_t2_request_int() uses the same one for all the
236 * requests in the transaction.
237 * (At least we hope so.)
239 KASSERT(rqp->sr_t2 == NULL ||
240 (rqp->sr_t2->t2_flags & SMBT2_SECONDARY) == 0 ||
241 rqp->sr_t2->t2_rq == rqp,
242 ("sec t2 rq not using same smb_rq"));
245 /* Initialize sec. signature field to sequence number + zeros. */
246 le32enc(rqp->sr_rqsig, rqp->sr_seqno);
247 le32enc(rqp->sr_rqsig + 4, 0);
250 * Compute HMAC-MD5 of packet data, keyed by MAC key.
251 * Store the first 8 bytes in the sec. signature field.
253 smb_rq_getrequest(rqp, &mbp);
255 MD5Update(&md5, vcp->vc_mackey, vcp->vc_mackeylen);
256 for (mb = mbp->mb_top; mb != NULL; mb = mb->m_next)
257 MD5Update(&md5, mtod(mb, void *), mb->m_len);
258 MD5Final(digest, &md5);
259 bcopy(digest, rqp->sr_rqsig, 8);
265 * Verify reply signature.
268 smb_rq_verify(struct smb_rq *rqp)
270 struct smb_vc *vcp = rqp->sr_vc;
277 KASSERT(vcp->vc_hflags2 & SMB_FLAGS2_SECURITY_SIGNATURE,
278 ("signatures not enabled"));
280 if (vcp->vc_mackey == NULL)
281 /* XXX Should check that this is a SMB_COM_NEGOTIATE reply. */
285 * Compute HMAC-MD5 of packet data, keyed by MAC key.
286 * We play games to pretend the security signature field
287 * contains their sequence number, to avoid modifying
290 smb_rq_getreply(rqp, &mdp);
292 KASSERT(mb->m_len >= SMB_HDRLEN, ("forgot to m_pullup"));
294 MD5Update(&md5, vcp->vc_mackey, vcp->vc_mackeylen);
295 MD5Update(&md5, mtod(mb, void *), 14);
296 *(u_int32_t *)sigbuf = htole32(rqp->sr_rseqno);
297 *(u_int32_t *)(sigbuf + 4) = 0;
298 MD5Update(&md5, sigbuf, 8);
299 MD5Update(&md5, mtod(mb, u_char *) + 22, mb->m_len - 22);
300 for (mb = mb->m_next; mb != NULL; mb = mb->m_next)
301 MD5Update(&md5, mtod(mb, void *), mb->m_len);
302 MD5Final(digest, &md5);
305 * Now verify the signature.
307 if (bcmp(mtod(mdp->md_top, u_char *) + 14, digest, 8) != 0)