blob: 78be2915fa2b0c773cc276fed856ce1efb090f66 [file] [log] [blame]
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001/*
2 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
3 * Copyright 2002 Markus Friedl <markus@openbsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "includes.h"
Ben Lindstrom2bf759c2002-07-07 22:13:31 +000028RCSID("$OpenBSD: monitor_wrap.c,v 1.16 2002/07/04 10:41:47 markus Exp $");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000029
30#include <openssl/bn.h>
31#include <openssl/dh.h>
32
33#include "ssh.h"
34#include "dh.h"
35#include "kex.h"
36#include "auth.h"
37#include "buffer.h"
38#include "bufaux.h"
39#include "packet.h"
40#include "mac.h"
41#include "log.h"
42#include "zlib.h"
43#include "monitor.h"
44#include "monitor_wrap.h"
45#include "xmalloc.h"
46#include "atomicio.h"
47#include "monitor_fdpass.h"
48#include "getput.h"
49
50#include "auth.h"
51#include "channels.h"
52#include "session.h"
53
54/* Imports */
55extern int compat20;
56extern Newkeys *newkeys[];
57extern z_stream incoming_stream;
58extern z_stream outgoing_stream;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +000059extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000060extern Buffer input, output;
61
62void
63mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
64{
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000065 u_int mlen = buffer_len(m);
Ben Lindstromb1bdc5a2002-07-04 00:09:26 +000066 u_char buf[5];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000067
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +000068 debug3("%s entering: type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000069
70 PUT_32BIT(buf, mlen + 1);
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000071 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000072 if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +000073 fatal("%s: write", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000074 if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +000075 fatal("%s: write", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000076}
77
78void
79mm_request_receive(int socket, Buffer *m)
80{
81 u_char buf[4];
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000082 u_int msg_len;
Ben Lindstromb1bdc5a2002-07-04 00:09:26 +000083 ssize_t res;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000084
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +000085 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000086
87 res = atomicio(read, socket, buf, sizeof(buf));
88 if (res != sizeof(buf)) {
89 if (res == 0)
90 fatal_cleanup();
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +000091 fatal("%s: read: %ld", __func__, (long)res);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000092 }
93 msg_len = GET_32BIT(buf);
94 if (msg_len > 256 * 1024)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +000095 fatal("%s: read: bad msg_len %d", __func__, msg_len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000096 buffer_clear(m);
97 buffer_append_space(m, msg_len);
98 res = atomicio(read, socket, buffer_ptr(m), msg_len);
99 if (res != msg_len)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000100 fatal("%s: read: %ld != msg_len", __func__, (long)res);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000101}
102
103void
104mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
105{
106 u_char rtype;
107
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000108 debug3("%s entering: type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000109
110 mm_request_receive(socket, m);
111 rtype = buffer_get_char(m);
112 if (rtype != type)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000113 fatal("%s: read: rtype %d != type %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000114 rtype, type);
115}
116
117DH *
118mm_choose_dh(int min, int nbits, int max)
119{
120 BIGNUM *p, *g;
121 int success = 0;
122 Buffer m;
123
124 buffer_init(&m);
125 buffer_put_int(&m, min);
126 buffer_put_int(&m, nbits);
127 buffer_put_int(&m, max);
128
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000129 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000130
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000131 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000132 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000133
134 success = buffer_get_char(&m);
135 if (success == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000136 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000137
138 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000139 fatal("%s: BN_new failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000140 if ((g = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000141 fatal("%s: BN_new failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000142 buffer_get_bignum2(&m, p);
143 buffer_get_bignum2(&m, g);
144
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000145 debug3("%s: remaining %d", __func__, buffer_len(&m));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000146 buffer_free(&m);
147
148 return (dh_new_group(g, p));
149}
150
151int
152mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
153{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000154 Kex *kex = *pmonitor->m_pkex;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000155 Buffer m;
156
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000157 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000158
159 buffer_init(&m);
160 buffer_put_int(&m, kex->host_key_index(key));
161 buffer_put_string(&m, data, datalen);
162
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000163 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000164
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000165 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000166 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000167 *sigp = buffer_get_string(&m, lenp);
168 buffer_free(&m);
169
170 return (0);
171}
172
173struct passwd *
174mm_getpwnamallow(const char *login)
175{
176 Buffer m;
177 struct passwd *pw;
178 u_int pwlen;
179
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000180 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000181
182 buffer_init(&m);
183 buffer_put_cstring(&m, login);
184
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000185 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000186
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000187 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000188 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000189
190 if (buffer_get_char(&m) == 0) {
191 buffer_free(&m);
192 return (NULL);
193 }
194 pw = buffer_get_string(&m, &pwlen);
195 if (pwlen != sizeof(struct passwd))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000196 fatal("%s: struct passwd size mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000197 pw->pw_name = buffer_get_string(&m, NULL);
198 pw->pw_passwd = buffer_get_string(&m, NULL);
199 pw->pw_gecos = buffer_get_string(&m, NULL);
Kevin Steves7e147602002-03-22 18:07:17 +0000200#ifdef HAVE_PW_CLASS_IN_PASSWD
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000201 pw->pw_class = buffer_get_string(&m, NULL);
Kevin Steves7e147602002-03-22 18:07:17 +0000202#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000203 pw->pw_dir = buffer_get_string(&m, NULL);
204 pw->pw_shell = buffer_get_string(&m, NULL);
205 buffer_free(&m);
206
207 return (pw);
208}
209
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000210char *mm_auth2_read_banner(void)
Damien Miller5ad9fd92002-05-13 11:07:41 +1000211{
212 Buffer m;
213 char *banner;
214
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000215 debug3("%s entering", __func__);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000216
217 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000218 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000219 buffer_clear(&m);
220
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000221 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000222 banner = buffer_get_string(&m, NULL);
223 buffer_free(&m);
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000224
Damien Miller5ad9fd92002-05-13 11:07:41 +1000225 return (banner);
226}
227
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000228/* Inform the privileged process about service and style */
229
230void
231mm_inform_authserv(char *service, char *style)
232{
233 Buffer m;
234
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000235 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000236
237 buffer_init(&m);
238 buffer_put_cstring(&m, service);
239 buffer_put_cstring(&m, style ? style : "");
240
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000241 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000242
243 buffer_free(&m);
244}
245
246/* Do the password authentication */
247int
248mm_auth_password(Authctxt *authctxt, char *password)
249{
250 Buffer m;
251 int authenticated = 0;
252
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000253 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000254
255 buffer_init(&m);
256 buffer_put_cstring(&m, password);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000257 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000258
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000259 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000260 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000261
262 authenticated = buffer_get_int(&m);
263
264 buffer_free(&m);
265
266 debug3("%s: user %sauthenticated",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000267 __func__, authenticated ? "" : "not ");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000268 return (authenticated);
269}
270
271int
272mm_user_key_allowed(struct passwd *pw, Key *key)
273{
274 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
275}
276
277int
278mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
279 Key *key)
280{
281 return (mm_key_allowed(MM_HOSTKEY, user, host, key));
282}
283
284int
285mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
286 char *host, Key *key)
287{
288 int ret;
289
290 key->type = KEY_RSA; /* XXX hack for key_to_blob */
291 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
292 key->type = KEY_RSA1;
293 return (ret);
294}
295
296static void
297mm_send_debug(Buffer *m)
298{
299 char *msg;
300
301 while (buffer_len(m)) {
302 msg = buffer_get_string(m, NULL);
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000303 debug3("%s: Sending debug: %s", __func__, msg);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000304 packet_send_debug("%s", msg);
305 xfree(msg);
306 }
307}
308
309int
310mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
311{
312 Buffer m;
313 u_char *blob;
314 u_int len;
315 int allowed = 0;
316
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000317 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000318
319 /* Convert the key to a blob and the pass it over */
320 if (!key_to_blob(key, &blob, &len))
321 return (0);
322
323 buffer_init(&m);
324 buffer_put_int(&m, type);
325 buffer_put_cstring(&m, user ? user : "");
326 buffer_put_cstring(&m, host ? host : "");
327 buffer_put_string(&m, blob, len);
328 xfree(blob);
329
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000330 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000331
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000332 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000333 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000334
335 allowed = buffer_get_int(&m);
336
337 /* Send potential debug messages */
338 mm_send_debug(&m);
339
340 buffer_free(&m);
341
342 return (allowed);
343}
344
345/*
346 * This key verify needs to send the key type along, because the
347 * privileged parent makes the decision if the key is allowed
348 * for authentication.
349 */
350
351int
352mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
353{
354 Buffer m;
355 u_char *blob;
356 u_int len;
357 int verified = 0;
358
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000359 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000360
361 /* Convert the key to a blob and the pass it over */
362 if (!key_to_blob(key, &blob, &len))
363 return (0);
364
365 buffer_init(&m);
366 buffer_put_string(&m, blob, len);
367 buffer_put_string(&m, sig, siglen);
368 buffer_put_string(&m, data, datalen);
369 xfree(blob);
370
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000371 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000372
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000373 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000374 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000375
376 verified = buffer_get_int(&m);
377
378 buffer_free(&m);
379
380 return (verified);
381}
382
383/* Export key state after authentication */
384Newkeys *
385mm_newkeys_from_blob(u_char *blob, int blen)
386{
387 Buffer b;
388 u_int len;
389 Newkeys *newkey = NULL;
390 Enc *enc;
391 Mac *mac;
392 Comp *comp;
393
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000394 debug3("%s: %p(%d)", __func__, blob, blen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000395#ifdef DEBUG_PK
396 dump_base64(stderr, blob, blen);
397#endif
398 buffer_init(&b);
399 buffer_append(&b, blob, blen);
400
401 newkey = xmalloc(sizeof(*newkey));
402 enc = &newkey->enc;
403 mac = &newkey->mac;
404 comp = &newkey->comp;
405
406 /* Enc structure */
407 enc->name = buffer_get_string(&b, NULL);
408 buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
409 enc->enabled = buffer_get_int(&b);
410 enc->block_size = buffer_get_int(&b);
411 enc->key = buffer_get_string(&b, &enc->key_len);
412 enc->iv = buffer_get_string(&b, &len);
413 if (len != enc->block_size)
Ben Lindstrom08512492002-06-27 00:23:02 +0000414 fatal("%s: bad ivlen: expected %u != %u", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000415 enc->block_size, len);
416
417 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000418 fatal("%s: bad cipher name %s or pointer %p", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000419 enc->name, enc->cipher);
420
421 /* Mac structure */
422 mac->name = buffer_get_string(&b, NULL);
423 if (mac->name == NULL || mac_init(mac, mac->name) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000424 fatal("%s: can not init mac %s", __func__, mac->name);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000425 mac->enabled = buffer_get_int(&b);
426 mac->key = buffer_get_string(&b, &len);
427 if (len > mac->key_len)
Ben Lindstrom08512492002-06-27 00:23:02 +0000428 fatal("%s: bad mac key length: %u > %d", __func__, len,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000429 mac->key_len);
430 mac->key_len = len;
431
432 /* Comp structure */
433 comp->type = buffer_get_int(&b);
434 comp->enabled = buffer_get_int(&b);
435 comp->name = buffer_get_string(&b, NULL);
436
437 len = buffer_len(&b);
438 if (len != 0)
Ben Lindstrom08512492002-06-27 00:23:02 +0000439 error("newkeys_from_blob: remaining bytes in blob %u", len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000440 buffer_free(&b);
441 return (newkey);
442}
443
444int
445mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
446{
447 Buffer b;
448 int len;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000449 Enc *enc;
450 Mac *mac;
451 Comp *comp;
452 Newkeys *newkey = newkeys[mode];
453
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000454 debug3("%s: converting %p", __func__, newkey);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000455
456 if (newkey == NULL) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000457 error("%s: newkey == NULL", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000458 return 0;
459 }
460 enc = &newkey->enc;
461 mac = &newkey->mac;
462 comp = &newkey->comp;
463
464 buffer_init(&b);
465 /* Enc structure */
466 buffer_put_cstring(&b, enc->name);
467 /* The cipher struct is constant and shared, you export pointer */
468 buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
469 buffer_put_int(&b, enc->enabled);
470 buffer_put_int(&b, enc->block_size);
471 buffer_put_string(&b, enc->key, enc->key_len);
472 packet_get_keyiv(mode, enc->iv, enc->block_size);
473 buffer_put_string(&b, enc->iv, enc->block_size);
474
475 /* Mac structure */
476 buffer_put_cstring(&b, mac->name);
477 buffer_put_int(&b, mac->enabled);
478 buffer_put_string(&b, mac->key, mac->key_len);
479
480 /* Comp structure */
481 buffer_put_int(&b, comp->type);
482 buffer_put_int(&b, comp->enabled);
483 buffer_put_cstring(&b, comp->name);
484
485 len = buffer_len(&b);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000486 if (lenp != NULL)
487 *lenp = len;
Ben Lindstrom2bf759c2002-07-07 22:13:31 +0000488 if (blobp != NULL) {
489 *blobp = xmalloc(len);
490 memcpy(*blobp, buffer_ptr(&b), len);
491 }
492 memset(buffer_ptr(&b), 0, len);
493 buffer_free(&b);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000494 return len;
495}
496
497static void
498mm_send_kex(Buffer *m, Kex *kex)
499{
500 buffer_put_string(m, kex->session_id, kex->session_id_len);
501 buffer_put_int(m, kex->we_need);
502 buffer_put_int(m, kex->hostkey_type);
503 buffer_put_int(m, kex->kex_type);
504 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
505 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
506 buffer_put_int(m, kex->flags);
507 buffer_put_cstring(m, kex->client_version_string);
508 buffer_put_cstring(m, kex->server_version_string);
509}
510
511void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000512mm_send_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000513{
514 Buffer m;
515 u_char *blob, *p;
516 u_int bloblen, plen;
517
518 buffer_init(&m);
519
520 if (!compat20) {
521 u_char iv[24];
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000522 u_char *key;
523 u_int ivlen, keylen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000524
525 buffer_put_int(&m, packet_get_protocol_flags());
526
527 buffer_put_int(&m, packet_get_ssh1_cipher());
528
Ben Lindstrom402c6cc2002-06-21 00:43:42 +0000529 debug3("%s: Sending ssh1 KEY+IV", __func__);
530 keylen = packet_get_encryption_key(NULL);
531 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
532 keylen = packet_get_encryption_key(key);
533 buffer_put_string(&m, key, keylen);
534 memset(key, 0, keylen);
535 xfree(key);
536
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000537 ivlen = packet_get_keyiv_len(MODE_OUT);
538 packet_get_keyiv(MODE_OUT, iv, ivlen);
539 buffer_put_string(&m, iv, ivlen);
540 ivlen = packet_get_keyiv_len(MODE_OUT);
541 packet_get_keyiv(MODE_IN, iv, ivlen);
542 buffer_put_string(&m, iv, ivlen);
543 goto skip;
544 } else {
545 /* Kex for rekeying */
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000546 mm_send_kex(&m, *pmonitor->m_pkex);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000547 }
548
549 debug3("%s: Sending new keys: %p %p",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000550 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000551
552 /* Keys from Kex */
553 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000554 fatal("%s: conversion of newkeys failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000555
556 buffer_put_string(&m, blob, bloblen);
557 xfree(blob);
558
559 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000560 fatal("%s: conversion of newkeys failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000561
562 buffer_put_string(&m, blob, bloblen);
563 xfree(blob);
564
565 buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
566 buffer_put_int(&m, packet_get_seqnr(MODE_IN));
567
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000568 debug3("%s: New keys have been sent", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000569 skip:
570 /* More key context */
571 plen = packet_get_keycontext(MODE_OUT, NULL);
572 p = xmalloc(plen+1);
573 packet_get_keycontext(MODE_OUT, p);
574 buffer_put_string(&m, p, plen);
575 xfree(p);
576
577 plen = packet_get_keycontext(MODE_IN, NULL);
578 p = xmalloc(plen+1);
579 packet_get_keycontext(MODE_IN, p);
580 buffer_put_string(&m, p, plen);
581 xfree(p);
582
583 /* Compression state */
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000584 debug3("%s: Sending compression state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000585 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
586 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
587
588 /* Network I/O buffers */
589 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
590 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
591
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000592 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000593 debug3("%s: Finished sending state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000594
595 buffer_free(&m);
596}
597
598int
599mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
600{
601 Buffer m;
602 u_char *p;
603 int success = 0;
604
605 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000606 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000607
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000608 debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000609 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000610
611 success = buffer_get_int(&m);
612 if (success == 0) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000613 debug3("%s: pty alloc failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000614 buffer_free(&m);
615 return (0);
616 }
617 p = buffer_get_string(&m, NULL);
618 buffer_free(&m);
619
620 strlcpy(namebuf, p, namebuflen); /* Possible truncation */
621 xfree(p);
622
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000623 *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
624 *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000625
626 /* Success */
627 return (1);
628}
629
630void
631mm_session_pty_cleanup2(void *session)
632{
633 Session *s = session;
634 Buffer m;
635
636 if (s->ttyfd == -1)
637 return;
638 buffer_init(&m);
639 buffer_put_cstring(&m, s->tty);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000640 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000641 buffer_free(&m);
642
643 /* closed dup'ed master */
644 if (close(s->ptymaster) < 0)
645 error("close(s->ptymaster): %s", strerror(errno));
646
647 /* unlink pty from session */
648 s->ttyfd = -1;
649}
650
Damien Miller79418552002-04-23 20:28:48 +1000651#ifdef USE_PAM
652void
653mm_start_pam(char *user)
654{
655 Buffer m;
656
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000657 debug3("%s entering", __func__);
Damien Miller79418552002-04-23 20:28:48 +1000658
659 buffer_init(&m);
660 buffer_put_cstring(&m, user);
661
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000662 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
Damien Miller79418552002-04-23 20:28:48 +1000663
664 buffer_free(&m);
665}
666#endif /* USE_PAM */
667
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000668/* Request process termination */
669
670void
671mm_terminate(void)
672{
673 Buffer m;
674
675 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000676 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000677 buffer_free(&m);
678}
679
680int
681mm_ssh1_session_key(BIGNUM *num)
682{
683 int rsafail;
684 Buffer m;
685
686 buffer_init(&m);
687 buffer_put_bignum2(&m, num);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000688 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000689
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000690 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000691
692 rsafail = buffer_get_int(&m);
693 buffer_get_bignum2(&m, num);
694
695 buffer_free(&m);
696
697 return (rsafail);
698}
699
700static void
701mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
702 char ***prompts, u_int **echo_on)
703{
Ben Lindstromcb72e4f2002-06-21 00:41:51 +0000704 *name = xstrdup("");
705 *infotxt = xstrdup("");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000706 *numprompts = 1;
Ben Lindstroma962c2f2002-07-04 00:14:17 +0000707 *prompts = xmalloc(*numprompts * sizeof(char *));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000708 *echo_on = xmalloc(*numprompts * sizeof(u_int));
709 (*echo_on)[0] = 0;
710}
711
712int
713mm_bsdauth_query(void *ctx, char **name, char **infotxt,
714 u_int *numprompts, char ***prompts, u_int **echo_on)
715{
716 Buffer m;
717 int res;
718 char *challenge;
719
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000720 debug3("%s: entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000721
722 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000723 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000724
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000725 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000726 &m);
727 res = buffer_get_int(&m);
728 if (res == -1) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000729 debug3("%s: no challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000730 buffer_free(&m);
731 return (-1);
732 }
733
734 /* Get the challenge, and format the response */
735 challenge = buffer_get_string(&m, NULL);
736 buffer_free(&m);
737
738 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
739 (*prompts)[0] = challenge;
740
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000741 debug3("%s: received challenge: %s", __func__, challenge);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000742
743 return (0);
744}
745
746int
747mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
748{
749 Buffer m;
750 int authok;
751
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000752 debug3("%s: entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000753 if (numresponses != 1)
754 return (-1);
755
756 buffer_init(&m);
757 buffer_put_cstring(&m, responses[0]);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000758 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000759
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000760 mm_request_receive_expect(pmonitor->m_recvfd,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000761 MONITOR_ANS_BSDAUTHRESPOND, &m);
762
763 authok = buffer_get_int(&m);
764 buffer_free(&m);
765
766 return ((authok == 0) ? -1 : 0);
767}
768
769int
770mm_skey_query(void *ctx, char **name, char **infotxt,
771 u_int *numprompts, char ***prompts, u_int **echo_on)
772{
773 Buffer m;
774 int len, res;
775 char *p, *challenge;
776
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000777 debug3("%s: entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000778
779 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000780 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000781
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000782 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000783 &m);
784 res = buffer_get_int(&m);
785 if (res == -1) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000786 debug3("%s: no challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000787 buffer_free(&m);
788 return (-1);
789 }
790
791 /* Get the challenge, and format the response */
792 challenge = buffer_get_string(&m, NULL);
793 buffer_free(&m);
794
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000795 debug3("%s: received challenge: %s", __func__, challenge);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000796
797 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
798
799 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
800 p = xmalloc(len);
801 strlcpy(p, challenge, len);
802 strlcat(p, SKEY_PROMPT, len);
803 (*prompts)[0] = p;
804 xfree(challenge);
805
806 return (0);
807}
808
809int
810mm_skey_respond(void *ctx, u_int numresponses, char **responses)
811{
812 Buffer m;
813 int authok;
814
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000815 debug3("%s: entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000816 if (numresponses != 1)
817 return (-1);
818
819 buffer_init(&m);
820 buffer_put_cstring(&m, responses[0]);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000821 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000822
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000823 mm_request_receive_expect(pmonitor->m_recvfd,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000824 MONITOR_ANS_SKEYRESPOND, &m);
825
826 authok = buffer_get_int(&m);
827 buffer_free(&m);
828
829 return ((authok == 0) ? -1 : 0);
830}
831
832void
833mm_ssh1_session_id(u_char session_id[16])
834{
835 Buffer m;
836 int i;
837
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000838 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000839
840 buffer_init(&m);
841 for (i = 0; i < 16; i++)
842 buffer_put_char(&m, session_id[i]);
843
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000844 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000845 buffer_free(&m);
846}
847
848int
849mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
850{
851 Buffer m;
852 Key *key;
853 u_char *blob;
854 u_int blen;
855 int allowed = 0;
856
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000857 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000858
859 buffer_init(&m);
860 buffer_put_bignum2(&m, client_n);
861
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000862 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
863 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000864
865 allowed = buffer_get_int(&m);
866
867 if (allowed && rkey != NULL) {
868 blob = buffer_get_string(&m, &blen);
869 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000870 fatal("%s: key_from_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000871 *rkey = key;
872 xfree(blob);
873 }
874 mm_send_debug(&m);
875 buffer_free(&m);
876
877 return (allowed);
878}
879
880BIGNUM *
881mm_auth_rsa_generate_challenge(Key *key)
882{
883 Buffer m;
884 BIGNUM *challenge;
885 u_char *blob;
886 u_int blen;
887
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000888 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000889
890 if ((challenge = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000891 fatal("%s: BN_new failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000892
893 key->type = KEY_RSA; /* XXX cheat for key_to_blob */
894 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000895 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000896 key->type = KEY_RSA1;
897
898 buffer_init(&m);
899 buffer_put_string(&m, blob, blen);
900 xfree(blob);
901
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000902 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
903 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000904
905 buffer_get_bignum2(&m, challenge);
906 buffer_free(&m);
907
908 return (challenge);
909}
910
911int
912mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
913{
914 Buffer m;
915 u_char *blob;
916 u_int blen;
917 int success = 0;
918
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000919 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000920
921 key->type = KEY_RSA; /* XXX cheat for key_to_blob */
922 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000923 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000924 key->type = KEY_RSA1;
925
926 buffer_init(&m);
927 buffer_put_string(&m, blob, blen);
928 buffer_put_string(&m, response, 16);
929 xfree(blob);
930
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000931 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
932 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000933
934 success = buffer_get_int(&m);
935 buffer_free(&m);
936
937 return (success);
938}