1/*-
2 * Copyright (c) 2000-2001, Boris Popov
3 * All rights reserved.
4 *
5 * Copyright (c) 2003, 2004 Tim J. Robbins.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without

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29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/sys/netsmb/smb_crypt.c 139823 2005-01-07 01:45:51Z imp $");
38
39#include <sys/param.h>
40#include <sys/malloc.h>
41#include <sys/kernel.h>
42#include <sys/systm.h>
43#include <sys/conf.h>
44#include <sys/proc.h>
45#include <sys/fcntl.h>

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54#include <sys/iconv.h>
55
56#include <netsmb/smb.h>
57#include <netsmb/smb_conn.h>
58#include <netsmb/smb_subr.h>
59#include <netsmb/smb_rq.h>
60#include <netsmb/smb_dev.h>
61
62#include "opt_netsmb.h"
63
64#ifdef NETSMBCRYPTO
65
66#include <crypto/des/des.h>
67
68static u_char N8[] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
69
70
71static void
72smb_E(const u_char *key, u_char *data, u_char *dest)
73{
74 des_key_schedule *ksp;
75 u_char kk[8];

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82 kk[5] = key[4] << 3 | (key[5] >> 5 & 0xfe);
83 kk[6] = key[5] << 2 | (key[6] >> 6 & 0xfe);
84 kk[7] = key[6] << 1;
85 ksp = malloc(sizeof(des_key_schedule), M_SMBTEMP, M_WAITOK);
86 des_set_key((des_cblock *)kk, *ksp);
87 des_ecb_encrypt((des_cblock *)data, (des_cblock *)dest, *ksp, 1);
88 free(ksp, M_SMBTEMP);
89}
90#endif
91
92
93int
94smb_encrypt(const u_char *apwd, u_char *C8, u_char *RN)
95{
96#ifdef NETSMBCRYPTO
97 u_char *p, *P14, *S21;
98
99 p = malloc(14 + 21, M_SMBTEMP, M_WAITOK);
100 bzero(p, 14 + 21);
101 P14 = p;
102 S21 = p + 14;
103 bcopy(apwd, P14, min(14, strlen(apwd)));
104 /*
105 * S21 = concat(Ex(P14, N8), zeros(5));
106 */
107 smb_E(P14, N8, S21);
108 smb_E(P14 + 7, N8, S21 + 8);
109
110 smb_E(S21, C8, RN);
111 smb_E(S21 + 7, C8, RN + 8);
112 smb_E(S21 + 14, C8, RN + 16);
113 free(p, M_SMBTEMP);
114 return 0;
115#else
116 SMBERROR("password encryption is not available\n");
117 bzero(RN, 24);
118 return EAUTH;
119#endif
120}
121
122int
123smb_ntencrypt(const u_char *apwd, u_char *C8, u_char *RN)
124{
125#ifdef NETSMBCRYPTO
126 u_char S21[21];
127 u_int16_t *unipwd;
128 MD4_CTX *ctxp;
129 int len;
130
131 len = strlen(apwd);
132 unipwd = malloc((len + 1) * sizeof(u_int16_t), M_SMBTEMP, M_WAITOK);
133 /*

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141 bzero(S21, 21);
142 MD4Final(S21, ctxp);
143 free(ctxp, M_SMBTEMP);
144
145 smb_E(S21, C8, RN);
146 smb_E(S21 + 7, C8, RN + 8);
147 smb_E(S21 + 14, C8, RN + 16);
148 return 0;
149#else
150 SMBERROR("password encryption is not available\n");
151 bzero(RN, 24);
152 return EAUTH;
153#endif
154}
155
156/*
157 * Calculate message authentication code (MAC) key for virtual circuit.
158 */
159int
160smb_calcmackey(struct smb_vc *vcp)
161{
162#ifdef NETSMBCRYPTO
163 const char *pwd;
164 u_int16_t *unipwd;
165 int len;
166 MD4_CTX md4;
167 u_char S16[16], S21[21];
168
169 KASSERT(vcp->vc_hflags2 & SMB_FLAGS2_SECURITY_SIGNATURE,
170 ("signatures not enabled"));

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205 */
206 bzero(S21, 21);
207 bcopy(S16, S21, 16);
208 smb_E(S21, vcp->vc_ch, vcp->vc_mackey + 16);
209 smb_E(S21 + 7, vcp->vc_ch, vcp->vc_mackey + 24);
210 smb_E(S21 + 14, vcp->vc_ch, vcp->vc_mackey + 32);
211
212 return (0);
213#else
214 panic("smb_calcmackey: encryption not available");
215 return (0);
216#endif /* NETSMBCRYPTO */
217}
218
219/*
220 * Sign request with MAC.
221 */
222int
223smb_rq_sign(struct smb_rq *rqp)
224{
225#ifdef NETSMBCRYPTO
226 struct smb_vc *vcp = rqp->sr_vc;
227 struct mbchain *mbp;
228 struct mbuf *mb;
229 MD5_CTX md5;
230 u_char digest[16];
231
232 KASSERT(vcp->vc_hflags2 & SMB_FLAGS2_SECURITY_SIGNATURE,
233 ("signatures not enabled"));

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273 MD5Init(&md5);
274 MD5Update(&md5, vcp->vc_mackey, vcp->vc_mackeylen);
275 for (mb = mbp->mb_top; mb != NULL; mb = mb->m_next)
276 MD5Update(&md5, mtod(mb, void *), mb->m_len);
277 MD5Final(digest, &md5);
278 bcopy(digest, rqp->sr_rqsig, 8);
279
280 return (0);
281#else
282 panic("smb_rq_sign: encryption not available");
283 return (0);
284#endif /* NETSMBCRYPTO */
285}
286
287/*
288 * Verify reply signature.
289 */
290int
291smb_rq_verify(struct smb_rq *rqp)
292{
293#ifdef NETSMBCRYPTO
294 struct smb_vc *vcp = rqp->sr_vc;
295 struct mdchain *mdp;
296 u_char sigbuf[8];
297 MD5_CTX md5;
298 u_char digest[16];
299 struct mbuf *mb;
300
301 KASSERT(vcp->vc_hflags2 & SMB_FLAGS2_SECURITY_SIGNATURE,

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327
328 /*
329 * Now verify the signature.
330 */
331 if (bcmp(mtod(mdp->md_top, u_char *) + 14, digest, 8) != 0)
332 return (EAUTH);
333
334 return (0);
335#else
336 panic("smb_rq_verify: encryption not available");
337 return (0);
338#endif /* NETSMBCRYPTO */
339}