blob: 3d7dcaf867d325f0c49463aa2501d143613d0905 [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"
Damien Millerb062c292003-03-24 09:12:09 +110028RCSID("$OpenBSD: monitor.c,v 1.34 2003/03/23 19:02:00 markus Exp $");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000029
30#include <openssl/dh.h>
31
32#ifdef SKEY
33#include <skey.h>
34#endif
35
36#include "ssh.h"
37#include "auth.h"
38#include "kex.h"
39#include "dh.h"
40#include "zlib.h"
41#include "packet.h"
42#include "auth-options.h"
43#include "sshpty.h"
44#include "channels.h"
45#include "session.h"
46#include "sshlogin.h"
47#include "canohost.h"
48#include "log.h"
49#include "servconf.h"
50#include "monitor.h"
51#include "monitor_mm.h"
52#include "monitor_wrap.h"
53#include "monitor_fdpass.h"
54#include "xmalloc.h"
55#include "misc.h"
56#include "buffer.h"
57#include "bufaux.h"
58#include "compat.h"
59#include "ssh2.h"
60#include "mpaux.h"
61
62/* Imports */
63extern ServerOptions options;
64extern u_int utmp_len;
65extern Newkeys *current_keys[];
66extern z_stream incoming_stream;
67extern z_stream outgoing_stream;
68extern u_char session_id[];
69extern Buffer input, output;
70extern Buffer auth_debug;
71extern int auth_debug_init;
72
73/* State exported from the child */
74
75struct {
76 z_stream incoming;
77 z_stream outgoing;
78 u_char *keyin;
79 u_int keyinlen;
80 u_char *keyout;
81 u_int keyoutlen;
82 u_char *ivin;
83 u_int ivinlen;
84 u_char *ivout;
85 u_int ivoutlen;
Ben Lindstrom402c6cc2002-06-21 00:43:42 +000086 u_char *ssh1key;
87 u_int ssh1keylen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +000088 int ssh1cipher;
89 int ssh1protoflags;
90 u_char *input;
91 u_int ilen;
92 u_char *output;
93 u_int olen;
94} child_state;
95
96/* Functions on the montior that answer unprivileged requests */
97
98int mm_answer_moduli(int, Buffer *);
99int mm_answer_sign(int, Buffer *);
100int mm_answer_pwnamallow(int, Buffer *);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000101int mm_answer_auth2_read_banner(int, Buffer *);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000102int mm_answer_authserv(int, Buffer *);
103int mm_answer_authpassword(int, Buffer *);
104int mm_answer_bsdauthquery(int, Buffer *);
105int mm_answer_bsdauthrespond(int, Buffer *);
106int mm_answer_skeyquery(int, Buffer *);
107int mm_answer_skeyrespond(int, Buffer *);
108int mm_answer_keyallowed(int, Buffer *);
109int mm_answer_keyverify(int, Buffer *);
110int mm_answer_pty(int, Buffer *);
111int mm_answer_pty_cleanup(int, Buffer *);
112int mm_answer_term(int, Buffer *);
113int mm_answer_rsa_keyallowed(int, Buffer *);
114int mm_answer_rsa_challenge(int, Buffer *);
115int mm_answer_rsa_response(int, Buffer *);
116int mm_answer_sesskey(int, Buffer *);
117int mm_answer_sessid(int, Buffer *);
118
Damien Miller79418552002-04-23 20:28:48 +1000119#ifdef USE_PAM
120int mm_answer_pam_start(int, Buffer *);
121#endif
122
Damien Millerd94e5492002-09-27 13:25:58 +1000123#ifdef KRB4
124int mm_answer_krb4(int, Buffer *);
125#endif
Damien Miller25162f22002-09-12 09:47:29 +1000126#ifdef KRB5
127int mm_answer_krb5(int, Buffer *);
128#endif
129
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000130static Authctxt *authctxt;
131static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
132
133/* local state for key verify */
134static u_char *key_blob = NULL;
135static u_int key_bloblen = 0;
136static int key_blobtype = MM_NOKEY;
Damien Millera10f5612002-09-12 09:49:15 +1000137static char *hostbased_cuser = NULL;
138static char *hostbased_chost = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000139static char *auth_method = "unknown";
Ben Lindstromf67e0772002-06-06 20:58:19 +0000140static int session_id2_len = 0;
141static u_char *session_id2 = NULL;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000142
143struct mon_table {
144 enum monitor_reqtype type;
145 int flags;
146 int (*f)(int, Buffer *);
147};
148
149#define MON_ISAUTH 0x0004 /* Required for Authentication */
150#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
151#define MON_ONCE 0x0010 /* Disable after calling */
152
153#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
154
155#define MON_PERMIT 0x1000 /* Request is permitted */
156
157struct mon_table mon_dispatch_proto20[] = {
158 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
159 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
160 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
161 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
Damien Miller5ad9fd92002-05-13 11:07:41 +1000162 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000163 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
Damien Miller79418552002-04-23 20:28:48 +1000164#ifdef USE_PAM
165 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
Kevin Stevesbd1901b2002-04-01 18:04:35 +0000166#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000167#ifdef BSD_AUTH
168 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
169 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
170#endif
171#ifdef SKEY
172 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
173 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
174#endif
175 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
176 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
177 {0, 0, NULL}
178};
179
180struct mon_table mon_dispatch_postauth20[] = {
181 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
182 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
183 {MONITOR_REQ_PTY, 0, mm_answer_pty},
184 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
185 {MONITOR_REQ_TERM, 0, mm_answer_term},
186 {0, 0, NULL}
187};
188
189struct mon_table mon_dispatch_proto15[] = {
190 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
191 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
192 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
193 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
194 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
195 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
196 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
197 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
198#ifdef BSD_AUTH
199 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
200 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
201#endif
202#ifdef SKEY
203 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
204 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
205#endif
Damien Millera33501b2002-05-08 12:24:42 +1000206#ifdef USE_PAM
207 {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
208#endif
Damien Millerd94e5492002-09-27 13:25:58 +1000209#ifdef KRB4
210 {MONITOR_REQ_KRB4, MON_ONCE|MON_AUTH, mm_answer_krb4},
211#endif
Damien Miller25162f22002-09-12 09:47:29 +1000212#ifdef KRB5
213 {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5},
214#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000215 {0, 0, NULL}
216};
217
218struct mon_table mon_dispatch_postauth15[] = {
219 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
220 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
221 {MONITOR_REQ_TERM, 0, mm_answer_term},
222 {0, 0, NULL}
223};
224
225struct mon_table *mon_dispatch;
226
227/* Specifies if a certain message is allowed at the moment */
228
229static void
230monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
231{
232 while (ent->f != NULL) {
233 if (ent->type == type) {
234 ent->flags &= ~MON_PERMIT;
235 ent->flags |= permit ? MON_PERMIT : 0;
236 return;
237 }
238 ent++;
239 }
240}
241
242static void
243monitor_permit_authentications(int permit)
244{
245 struct mon_table *ent = mon_dispatch;
246
247 while (ent->f != NULL) {
248 if (ent->flags & MON_AUTH) {
249 ent->flags &= ~MON_PERMIT;
250 ent->flags |= permit ? MON_PERMIT : 0;
251 }
252 ent++;
253 }
254}
255
256Authctxt *
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000257monitor_child_preauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000258{
259 struct mon_table *ent;
260 int authenticated = 0;
261
262 debug3("preauth child monitor started");
263
264 if (compat20) {
265 mon_dispatch = mon_dispatch_proto20;
266
267 /* Permit requests for moduli and signatures */
268 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
269 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
270 } else {
271 mon_dispatch = mon_dispatch_proto15;
272
273 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
274 }
275
276 authctxt = authctxt_new();
277
278 /* The first few requests do not require asynchronous access */
279 while (!authenticated) {
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000280 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000281 if (authenticated) {
282 if (!(ent->flags & MON_AUTHDECIDE))
283 fatal("%s: unexpected authentication from %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000284 __func__, ent->type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000285 if (authctxt->pw->pw_uid == 0 &&
286 !auth_root_allowed(auth_method))
287 authenticated = 0;
Damien Miller79418552002-04-23 20:28:48 +1000288#ifdef USE_PAM
289 if (!do_pam_account(authctxt->pw->pw_name, NULL))
290 authenticated = 0;
291#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000292 }
293
294 if (ent->flags & MON_AUTHDECIDE) {
295 auth_log(authctxt, authenticated, auth_method,
296 compat20 ? " ssh2" : "");
297 if (!authenticated)
298 authctxt->failures++;
299 }
300 }
301
302 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000303 fatal("%s: authenticated invalid user", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000304
305 debug("%s: %s has been authenticated by privileged process",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000306 __func__, authctxt->user);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000307
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000308 mm_get_keystate(pmonitor);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000309
310 return (authctxt);
311}
312
313void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000314monitor_child_postauth(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000315{
316 if (compat20) {
317 mon_dispatch = mon_dispatch_postauth20;
318
319 /* Permit requests for moduli and signatures */
320 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
321 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
322 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
323
324 } else {
325 mon_dispatch = mon_dispatch_postauth15;
326 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
327 }
328 if (!no_pty_flag) {
329 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
330 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
331 }
332
333 for (;;)
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000334 monitor_read(pmonitor, mon_dispatch, NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000335}
336
337void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000338monitor_sync(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000339{
Damien Miller2d6b8332002-06-21 15:59:49 +1000340 if (options.compression) {
341 /* The member allocation is not visible, so sync it */
342 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
343 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000344}
345
346int
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000347monitor_read(struct monitor *pmonitor, struct mon_table *ent,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000348 struct mon_table **pent)
349{
350 Buffer m;
351 int ret;
352 u_char type;
353
354 buffer_init(&m);
355
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000356 mm_request_receive(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000357 type = buffer_get_char(&m);
358
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000359 debug3("%s: checking request %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000360
361 while (ent->f != NULL) {
362 if (ent->type == type)
363 break;
364 ent++;
365 }
366
367 if (ent->f != NULL) {
368 if (!(ent->flags & MON_PERMIT))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000369 fatal("%s: unpermitted request %d", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000370 type);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +0000371 ret = (*ent->f)(pmonitor->m_sendfd, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000372 buffer_free(&m);
373
374 /* The child may use this request only once, disable it */
375 if (ent->flags & MON_ONCE) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000376 debug2("%s: %d used once, disabling now", __func__,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000377 type);
378 ent->flags &= ~MON_PERMIT;
379 }
380
381 if (pent != NULL)
382 *pent = ent;
383
384 return ret;
385 }
386
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000387 fatal("%s: unsupported request: %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000388
389 /* NOTREACHED */
390 return (-1);
391}
392
393/* allowed key state */
394static int
395monitor_allowed_key(u_char *blob, u_int bloblen)
396{
397 /* make sure key is allowed */
398 if (key_blob == NULL || key_bloblen != bloblen ||
399 memcmp(key_blob, blob, key_bloblen))
400 return (0);
401 return (1);
402}
403
404static void
405monitor_reset_key_state(void)
406{
407 /* reset state */
408 if (key_blob != NULL)
409 xfree(key_blob);
410 if (hostbased_cuser != NULL)
411 xfree(hostbased_cuser);
412 if (hostbased_chost != NULL)
413 xfree(hostbased_chost);
414 key_blob = NULL;
415 key_bloblen = 0;
416 key_blobtype = MM_NOKEY;
417 hostbased_cuser = NULL;
418 hostbased_chost = NULL;
419}
420
421int
422mm_answer_moduli(int socket, Buffer *m)
423{
424 DH *dh;
425 int min, want, max;
426
427 min = buffer_get_int(m);
428 want = buffer_get_int(m);
429 max = buffer_get_int(m);
430
431 debug3("%s: got parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000432 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000433 /* We need to check here, too, in case the child got corrupted */
434 if (max < min || want < min || max < want)
435 fatal("%s: bad parameters: %d %d %d",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000436 __func__, min, want, max);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000437
438 buffer_clear(m);
439
440 dh = choose_dh(min, want, max);
441 if (dh == NULL) {
442 buffer_put_char(m, 0);
443 return (0);
444 } else {
445 /* Send first bignum */
446 buffer_put_char(m, 1);
447 buffer_put_bignum2(m, dh->p);
448 buffer_put_bignum2(m, dh->g);
449
450 DH_free(dh);
451 }
452 mm_request_send(socket, MONITOR_ANS_MODULI, m);
453 return (0);
454}
455
456int
457mm_answer_sign(int socket, Buffer *m)
458{
459 Key *key;
460 u_char *p;
461 u_char *signature;
462 u_int siglen, datlen;
463 int keyid;
464
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000465 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000466
467 keyid = buffer_get_int(m);
468 p = buffer_get_string(m, &datlen);
469
470 if (datlen != 20)
Ben Lindstromd5502182002-06-27 00:12:57 +0000471 fatal("%s: data length incorrect: %u", __func__, datlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000472
Ben Lindstromf67e0772002-06-06 20:58:19 +0000473 /* save session id, it will be passed on the first call */
474 if (session_id2_len == 0) {
475 session_id2_len = datlen;
476 session_id2 = xmalloc(session_id2_len);
477 memcpy(session_id2, p, session_id2_len);
478 }
479
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000480 if ((key = get_hostkey_by_index(keyid)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000481 fatal("%s: no hostkey from index %d", __func__, keyid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000482 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000483 fatal("%s: key_sign failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000484
Ben Lindstromd5502182002-06-27 00:12:57 +0000485 debug3("%s: signature %p(%u)", __func__, signature, siglen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000486
487 buffer_clear(m);
488 buffer_put_string(m, signature, siglen);
489
490 xfree(p);
491 xfree(signature);
492
493 mm_request_send(socket, MONITOR_ANS_SIGN, m);
494
495 /* Turn on permissions for getpwnam */
496 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
497
498 return (0);
499}
500
501/* Retrieves the password entry and also checks if the user is permitted */
502
503int
504mm_answer_pwnamallow(int socket, Buffer *m)
505{
506 char *login;
507 struct passwd *pwent;
508 int allowed = 0;
509
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000510 debug3("%s", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000511
512 if (authctxt->attempt++ != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000513 fatal("%s: multiple attempts for getpwnam", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000514
515 login = buffer_get_string(m, NULL);
516
517 pwent = getpwnamallow(login);
518
519 authctxt->user = xstrdup(login);
520 setproctitle("%s [priv]", pwent ? login : "unknown");
521 xfree(login);
522
523 buffer_clear(m);
524
525 if (pwent == NULL) {
526 buffer_put_char(m, 0);
527 goto out;
528 }
529
530 allowed = 1;
531 authctxt->pw = pwent;
532 authctxt->valid = 1;
533
534 buffer_put_char(m, 1);
535 buffer_put_string(m, pwent, sizeof(struct passwd));
536 buffer_put_cstring(m, pwent->pw_name);
537 buffer_put_cstring(m, "*");
538 buffer_put_cstring(m, pwent->pw_gecos);
Kevin Steves7e147602002-03-22 18:07:17 +0000539#ifdef HAVE_PW_CLASS_IN_PASSWD
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000540 buffer_put_cstring(m, pwent->pw_class);
Kevin Steves7e147602002-03-22 18:07:17 +0000541#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000542 buffer_put_cstring(m, pwent->pw_dir);
543 buffer_put_cstring(m, pwent->pw_shell);
544
545 out:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000546 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000547 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
548
549 /* For SSHv1 allow authentication now */
550 if (!compat20)
551 monitor_permit_authentications(1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000552 else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000553 /* Allow service/style information on the auth context */
554 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000555 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
556 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000557
Damien Millera33501b2002-05-08 12:24:42 +1000558#ifdef USE_PAM
559 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
560#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000561
562 return (0);
563}
564
Damien Miller5ad9fd92002-05-13 11:07:41 +1000565int mm_answer_auth2_read_banner(int socket, Buffer *m)
566{
567 char *banner;
568
569 buffer_clear(m);
570 banner = auth2_read_banner();
571 buffer_put_cstring(m, banner != NULL ? banner : "");
572 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
573
574 if (banner != NULL)
Ben Lindstromeec16fc2002-07-04 00:06:15 +0000575 xfree(banner);
Damien Miller5ad9fd92002-05-13 11:07:41 +1000576
577 return (0);
578}
579
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000580int
581mm_answer_authserv(int socket, Buffer *m)
582{
583 monitor_permit_authentications(1);
584
585 authctxt->service = buffer_get_string(m, NULL);
586 authctxt->style = buffer_get_string(m, NULL);
587 debug3("%s: service=%s, style=%s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000588 __func__, authctxt->service, authctxt->style);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000589
590 if (strlen(authctxt->style) == 0) {
591 xfree(authctxt->style);
592 authctxt->style = NULL;
593 }
594
595 return (0);
596}
597
598int
599mm_answer_authpassword(int socket, Buffer *m)
600{
601 static int call_count;
602 char *passwd;
Ben Lindstrom7cea16b2002-07-23 21:13:40 +0000603 int authenticated;
604 u_int plen;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000605
606 passwd = buffer_get_string(m, &plen);
607 /* Only authenticate if the context is valid */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000608 authenticated = options.password_authentication &&
609 authctxt->valid && auth_password(authctxt, passwd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000610 memset(passwd, 0, strlen(passwd));
611 xfree(passwd);
612
613 buffer_clear(m);
614 buffer_put_int(m, authenticated);
615
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000616 debug3("%s: sending result %d", __func__, authenticated);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000617 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
618
619 call_count++;
620 if (plen == 0 && call_count == 1)
621 auth_method = "none";
622 else
623 auth_method = "password";
624
625 /* Causes monitor loop to terminate if authenticated */
626 return (authenticated);
627}
628
629#ifdef BSD_AUTH
630int
631mm_answer_bsdauthquery(int socket, Buffer *m)
632{
633 char *name, *infotxt;
634 u_int numprompts;
635 u_int *echo_on;
636 char **prompts;
Damien Millerb7df3af2003-02-24 11:55:46 +1100637 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000638
Damien Millerb7df3af2003-02-24 11:55:46 +1100639 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
640 &prompts, &echo_on) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000641
642 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100643 buffer_put_int(m, success);
644 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000645 buffer_put_cstring(m, prompts[0]);
646
Damien Millerb7df3af2003-02-24 11:55:46 +1100647 debug3("%s: sending challenge success: %u", __func__, success);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000648 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
649
Damien Millerb7df3af2003-02-24 11:55:46 +1100650 if (success) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000651 xfree(name);
652 xfree(infotxt);
653 xfree(prompts);
654 xfree(echo_on);
655 }
656
657 return (0);
658}
659
660int
661mm_answer_bsdauthrespond(int socket, Buffer *m)
662{
663 char *response;
664 int authok;
665
666 if (authctxt->as == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000667 fatal("%s: no bsd auth session", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000668
669 response = buffer_get_string(m, NULL);
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000670 authok = options.challenge_response_authentication &&
671 auth_userresponse(authctxt->as, response, 0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000672 authctxt->as = NULL;
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000673 debug3("%s: <%s> = <%d>", __func__, response, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000674 xfree(response);
675
676 buffer_clear(m);
677 buffer_put_int(m, authok);
678
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000679 debug3("%s: sending authenticated: %d", __func__, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000680 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
681
682 auth_method = "bsdauth";
683
684 return (authok != 0);
685}
686#endif
687
688#ifdef SKEY
689int
690mm_answer_skeyquery(int socket, Buffer *m)
691{
692 struct skey skey;
693 char challenge[1024];
Damien Millerb7df3af2003-02-24 11:55:46 +1100694 u_int success;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000695
Damien Millerb7df3af2003-02-24 11:55:46 +1100696 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000697
698 buffer_clear(m);
Damien Millerb7df3af2003-02-24 11:55:46 +1100699 buffer_put_int(m, success);
700 if (success)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000701 buffer_put_cstring(m, challenge);
702
Damien Millerb7df3af2003-02-24 11:55:46 +1100703 debug3("%s: sending challenge success: %u", __func__, success);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000704 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
705
706 return (0);
707}
708
709int
710mm_answer_skeyrespond(int socket, Buffer *m)
711{
712 char *response;
713 int authok;
714
715 response = buffer_get_string(m, NULL);
716
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000717 authok = (options.challenge_response_authentication &&
718 authctxt->valid &&
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000719 skey_haskey(authctxt->pw->pw_name) == 0 &&
720 skey_passcheck(authctxt->pw->pw_name, response) != -1);
721
722 xfree(response);
723
724 buffer_clear(m);
725 buffer_put_int(m, authok);
726
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000727 debug3("%s: sending authenticated: %d", __func__, authok);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000728 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
729
730 auth_method = "skey";
731
732 return (authok != 0);
733}
734#endif
735
Damien Miller79418552002-04-23 20:28:48 +1000736#ifdef USE_PAM
737int
738mm_answer_pam_start(int socket, Buffer *m)
739{
740 char *user;
741
742 user = buffer_get_string(m, NULL);
743
744 start_pam(user);
745
746 xfree(user);
747
748 return (0);
749}
750#endif
751
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000752static void
753mm_append_debug(Buffer *m)
754{
755 if (auth_debug_init && buffer_len(&auth_debug)) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000756 debug3("%s: Appending debug messages for child", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000757 buffer_append(m, buffer_ptr(&auth_debug),
758 buffer_len(&auth_debug));
759 buffer_clear(&auth_debug);
760 }
761}
762
763int
764mm_answer_keyallowed(int socket, Buffer *m)
765{
766 Key *key;
Damien Millera10f5612002-09-12 09:49:15 +1000767 char *cuser, *chost;
768 u_char *blob;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000769 u_int bloblen;
770 enum mm_keytype type = 0;
771 int allowed = 0;
772
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000773 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000774
775 type = buffer_get_int(m);
776 cuser = buffer_get_string(m, NULL);
777 chost = buffer_get_string(m, NULL);
778 blob = buffer_get_string(m, &bloblen);
779
780 key = key_from_blob(blob, bloblen);
781
782 if ((compat20 && type == MM_RSAHOSTKEY) ||
783 (!compat20 && type != MM_RSAHOSTKEY))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000784 fatal("%s: key type and protocol mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000785
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000786 debug3("%s: key_from_blob: %p", __func__, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000787
788 if (key != NULL && authctxt->pw != NULL) {
789 switch(type) {
790 case MM_USERKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000791 allowed = options.pubkey_authentication &&
792 user_key_allowed(authctxt->pw, key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000793 break;
794 case MM_HOSTKEY:
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000795 allowed = options.hostbased_authentication &&
796 hostbased_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000797 cuser, chost, key);
798 break;
799 case MM_RSAHOSTKEY:
800 key->type = KEY_RSA1; /* XXX */
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +0000801 allowed = options.rhosts_rsa_authentication &&
802 auth_rhosts_rsa_key_allowed(authctxt->pw,
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000803 cuser, chost, key);
804 break;
805 default:
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000806 fatal("%s: unknown key type %d", __func__, type);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000807 break;
808 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000809 }
Damien Miller00111382003-03-10 11:21:17 +1100810 if (key != NULL)
811 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000812
813 /* clear temporarily storage (used by verify) */
814 monitor_reset_key_state();
815
816 if (allowed) {
817 /* Save temporarily for comparison in verify */
818 key_blob = blob;
819 key_bloblen = bloblen;
820 key_blobtype = type;
821 hostbased_cuser = cuser;
822 hostbased_chost = chost;
823 }
824
825 debug3("%s: key %p is %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000826 __func__, key, allowed ? "allowed" : "disallowed");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000827
828 buffer_clear(m);
829 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +1100830 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000831
832 mm_append_debug(m);
833
834 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
835
836 if (type == MM_RSAHOSTKEY)
837 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
838
839 return (0);
840}
841
842static int
843monitor_valid_userblob(u_char *data, u_int datalen)
844{
845 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +1000846 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000847 u_int len;
848 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000849
850 buffer_init(&b);
851 buffer_append(&b, data, datalen);
852
853 if (datafellows & SSH_OLD_SESSIONID) {
Ben Lindstromf67e0772002-06-06 20:58:19 +0000854 p = buffer_ptr(&b);
855 len = buffer_len(&b);
856 if ((session_id2 == NULL) ||
857 (len < session_id2_len) ||
858 (memcmp(p, session_id2, session_id2_len) != 0))
859 fail++;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000860 buffer_consume(&b, session_id2_len);
861 } else {
Ben Lindstromf67e0772002-06-06 20:58:19 +0000862 p = buffer_get_string(&b, &len);
863 if ((session_id2 == NULL) ||
864 (len != session_id2_len) ||
865 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000866 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +0000867 xfree(p);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000868 }
869 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
870 fail++;
871 p = buffer_get_string(&b, NULL);
872 if (strcmp(authctxt->user, p) != 0) {
873 log("wrong user name passed to monitor: expected %s != %.100s",
874 authctxt->user, p);
875 fail++;
876 }
877 xfree(p);
878 buffer_skip_string(&b);
879 if (datafellows & SSH_BUG_PKAUTH) {
880 if (!buffer_get_char(&b))
881 fail++;
882 } else {
883 p = buffer_get_string(&b, NULL);
884 if (strcmp("publickey", p) != 0)
885 fail++;
886 xfree(p);
887 if (!buffer_get_char(&b))
888 fail++;
889 buffer_skip_string(&b);
890 }
891 buffer_skip_string(&b);
892 if (buffer_len(&b) != 0)
893 fail++;
894 buffer_free(&b);
895 return (fail == 0);
896}
897
898static int
Damien Millera10f5612002-09-12 09:49:15 +1000899monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
900 char *chost)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000901{
902 Buffer b;
Damien Millera10f5612002-09-12 09:49:15 +1000903 char *p;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000904 u_int len;
905 int fail = 0;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000906
907 buffer_init(&b);
908 buffer_append(&b, data, datalen);
909
Ben Lindstromf67e0772002-06-06 20:58:19 +0000910 p = buffer_get_string(&b, &len);
911 if ((session_id2 == NULL) ||
912 (len != session_id2_len) ||
913 (memcmp(p, session_id2, session_id2_len) != 0))
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000914 fail++;
Ben Lindstromf67e0772002-06-06 20:58:19 +0000915 xfree(p);
916
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000917 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
918 fail++;
919 p = buffer_get_string(&b, NULL);
920 if (strcmp(authctxt->user, p) != 0) {
921 log("wrong user name passed to monitor: expected %s != %.100s",
922 authctxt->user, p);
923 fail++;
924 }
925 xfree(p);
926 buffer_skip_string(&b); /* service */
927 p = buffer_get_string(&b, NULL);
928 if (strcmp(p, "hostbased") != 0)
929 fail++;
930 xfree(p);
931 buffer_skip_string(&b); /* pkalg */
932 buffer_skip_string(&b); /* pkblob */
933
934 /* verify client host, strip trailing dot if necessary */
935 p = buffer_get_string(&b, NULL);
936 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
937 p[len - 1] = '\0';
938 if (strcmp(p, chost) != 0)
939 fail++;
940 xfree(p);
941
942 /* verify client user */
943 p = buffer_get_string(&b, NULL);
944 if (strcmp(p, cuser) != 0)
945 fail++;
946 xfree(p);
947
948 if (buffer_len(&b) != 0)
949 fail++;
950 buffer_free(&b);
951 return (fail == 0);
952}
953
954int
955mm_answer_keyverify(int socket, Buffer *m)
956{
957 Key *key;
958 u_char *signature, *data, *blob;
959 u_int signaturelen, datalen, bloblen;
960 int verified = 0;
961 int valid_data = 0;
962
963 blob = buffer_get_string(m, &bloblen);
964 signature = buffer_get_string(m, &signaturelen);
965 data = buffer_get_string(m, &datalen);
966
967 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
Ben Lindstromb57a4bf2002-03-27 18:00:59 +0000968 !monitor_allowed_key(blob, bloblen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000969 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000970
971 key = key_from_blob(blob, bloblen);
972 if (key == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000973 fatal("%s: bad public key blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000974
975 switch (key_blobtype) {
976 case MM_USERKEY:
977 valid_data = monitor_valid_userblob(data, datalen);
978 break;
979 case MM_HOSTKEY:
980 valid_data = monitor_valid_hostbasedblob(data, datalen,
981 hostbased_cuser, hostbased_chost);
982 break;
983 default:
984 valid_data = 0;
985 break;
986 }
987 if (!valid_data)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000988 fatal("%s: bad signature data blob", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000989
990 verified = key_verify(key, signature, signaturelen, data, datalen);
991 debug3("%s: key %p signature %s",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +0000992 __func__, key, verified ? "verified" : "unverified");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000993
994 key_free(key);
995 xfree(blob);
996 xfree(signature);
997 xfree(data);
998
Ben Lindstrome1c09122002-06-23 00:38:24 +0000999 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1000
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001001 monitor_reset_key_state();
1002
1003 buffer_clear(m);
1004 buffer_put_int(m, verified);
1005 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1006
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001007 return (verified);
1008}
1009
1010static void
1011mm_record_login(Session *s, struct passwd *pw)
1012{
1013 socklen_t fromlen;
1014 struct sockaddr_storage from;
1015
1016 /*
1017 * Get IP address of client. If the connection is not a socket, let
1018 * the address be 0.0.0.0.
1019 */
1020 memset(&from, 0, sizeof(from));
Damien Millerebc23062002-09-04 16:45:09 +10001021 fromlen = sizeof(from);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001022 if (packet_connection_is_on_socket()) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001023 if (getpeername(packet_get_connection_in(),
1024 (struct sockaddr *) & from, &fromlen) < 0) {
1025 debug("getpeername: %.100s", strerror(errno));
1026 fatal_cleanup();
1027 }
1028 }
1029 /* Record that there was a login on that tty from the remote host. */
1030 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1031 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
Damien Millerebc23062002-09-04 16:45:09 +10001032 (struct sockaddr *)&from, fromlen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001033}
1034
1035static void
1036mm_session_close(Session *s)
1037{
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001038 debug3("%s: session %d pid %d", __func__, s->self, s->pid);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001039 if (s->ttyfd != -1) {
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001040 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001041 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1042 session_pty_cleanup2(s);
1043 }
1044 s->used = 0;
1045}
1046
1047int
1048mm_answer_pty(int socket, Buffer *m)
1049{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001050 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001051 Session *s;
1052 int res, fd0;
1053
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001054 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001055
1056 buffer_clear(m);
1057 s = session_new();
1058 if (s == NULL)
1059 goto error;
1060 s->authctxt = authctxt;
1061 s->pw = authctxt->pw;
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001062 s->pid = pmonitor->m_pid;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001063 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1064 if (res == 0)
1065 goto error;
1066 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1067 pty_setowner(authctxt->pw, s->tty);
1068
1069 buffer_put_int(m, 1);
1070 buffer_put_cstring(m, s->tty);
1071 mm_request_send(socket, MONITOR_ANS_PTY, m);
1072
1073 mm_send_fd(socket, s->ptyfd);
1074 mm_send_fd(socket, s->ttyfd);
1075
1076 /* We need to trick ttyslot */
1077 if (dup2(s->ttyfd, 0) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001078 fatal("%s: dup2", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001079
1080 mm_record_login(s, authctxt->pw);
1081
1082 /* Now we can close the file descriptor again */
1083 close(0);
1084
1085 /* make sure nothing uses fd 0 */
1086 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001087 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001088 if (fd0 != 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001089 error("%s: fd0 %d != 0", __func__, fd0);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001090
1091 /* slave is not needed */
1092 close(s->ttyfd);
1093 s->ttyfd = s->ptyfd;
1094 /* no need to dup() because nobody closes ptyfd */
1095 s->ptymaster = s->ptyfd;
1096
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001097 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001098
1099 return (0);
1100
1101 error:
1102 if (s != NULL)
1103 mm_session_close(s);
1104 buffer_put_int(m, 0);
1105 mm_request_send(socket, MONITOR_ANS_PTY, m);
1106 return (0);
1107}
1108
1109int
1110mm_answer_pty_cleanup(int socket, Buffer *m)
1111{
1112 Session *s;
1113 char *tty;
1114
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001115 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001116
1117 tty = buffer_get_string(m, NULL);
1118 if ((s = session_by_tty(tty)) != NULL)
1119 mm_session_close(s);
1120 buffer_clear(m);
1121 xfree(tty);
1122 return (0);
1123}
1124
1125int
1126mm_answer_sesskey(int socket, Buffer *m)
1127{
1128 BIGNUM *p;
1129 int rsafail;
1130
1131 /* Turn off permissions */
1132 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1133
1134 if ((p = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001135 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001136
1137 buffer_get_bignum2(m, p);
1138
1139 rsafail = ssh1_session_key(p);
1140
1141 buffer_clear(m);
1142 buffer_put_int(m, rsafail);
1143 buffer_put_bignum2(m, p);
1144
1145 BN_clear_free(p);
1146
1147 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1148
1149 /* Turn on permissions for sessid passing */
1150 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1151
1152 return (0);
1153}
1154
1155int
1156mm_answer_sessid(int socket, Buffer *m)
1157{
1158 int i;
1159
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001160 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001161
1162 if (buffer_len(m) != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001163 fatal("%s: bad ssh1 session id", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001164 for (i = 0; i < 16; i++)
1165 session_id[i] = buffer_get_char(m);
1166
1167 /* Turn on permissions for getpwnam */
1168 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1169
1170 return (0);
1171}
1172
1173int
1174mm_answer_rsa_keyallowed(int socket, Buffer *m)
1175{
1176 BIGNUM *client_n;
1177 Key *key = NULL;
1178 u_char *blob = NULL;
1179 u_int blen = 0;
1180 int allowed = 0;
1181
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001182 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001183
Ben Lindstromdcf6bfb2002-06-06 20:57:17 +00001184 if (options.rsa_authentication && authctxt->valid) {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001185 if ((client_n = BN_new()) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001186 fatal("%s: BN_new", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001187 buffer_get_bignum2(m, client_n);
1188 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1189 BN_clear_free(client_n);
1190 }
1191 buffer_clear(m);
1192 buffer_put_int(m, allowed);
Damien Miller06ebedf2003-02-24 12:03:38 +11001193 buffer_put_int(m, forced_command != NULL);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001194
1195 /* clear temporarily storage (used by generate challenge) */
1196 monitor_reset_key_state();
1197
1198 if (allowed && key != NULL) {
1199 key->type = KEY_RSA; /* cheat for key_to_blob */
1200 if (key_to_blob(key, &blob, &blen) == 0)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001201 fatal("%s: key_to_blob failed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001202 buffer_put_string(m, blob, blen);
1203
1204 /* Save temporarily for comparison in verify */
1205 key_blob = blob;
1206 key_bloblen = blen;
1207 key_blobtype = MM_RSAUSERKEY;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001208 }
Damien Miller00111382003-03-10 11:21:17 +11001209 if (key != NULL)
1210 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001211
1212 mm_append_debug(m);
1213
1214 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1215
1216 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1217 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1218 return (0);
1219}
1220
1221int
1222mm_answer_rsa_challenge(int socket, Buffer *m)
1223{
1224 Key *key = NULL;
1225 u_char *blob;
1226 u_int blen;
1227
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001228 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001229
1230 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001231 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001232 blob = buffer_get_string(m, &blen);
1233 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001234 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001235 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001236 fatal("%s: key type mismatch", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001237 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001238 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001239
1240 if (ssh1_challenge)
1241 BN_clear_free(ssh1_challenge);
1242 ssh1_challenge = auth_rsa_generate_challenge(key);
1243
1244 buffer_clear(m);
1245 buffer_put_bignum2(m, ssh1_challenge);
1246
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001247 debug3("%s sending reply", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001248 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1249
1250 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
Damien Miller00111382003-03-10 11:21:17 +11001251
1252 xfree(blob);
1253 key_free(key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001254 return (0);
1255}
1256
1257int
1258mm_answer_rsa_response(int socket, Buffer *m)
1259{
1260 Key *key = NULL;
1261 u_char *blob, *response;
1262 u_int blen, len;
1263 int success;
1264
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001265 debug3("%s entering", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001266
1267 if (!authctxt->valid)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001268 fatal("%s: authctxt not valid", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001269 if (ssh1_challenge == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001270 fatal("%s: no ssh1_challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001271
1272 blob = buffer_get_string(m, &blen);
1273 if (!monitor_allowed_key(blob, blen))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001274 fatal("%s: bad key, not previously allowed", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001275 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001276 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001277 if ((key = key_from_blob(blob, blen)) == NULL)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001278 fatal("%s: received bad key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001279 response = buffer_get_string(m, &len);
1280 if (len != 16)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001281 fatal("%s: received bad response to challenge", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001282 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1283
Damien Miller00111382003-03-10 11:21:17 +11001284 xfree(blob);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001285 key_free(key);
1286 xfree(response);
1287
1288 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1289
1290 /* reset state */
1291 BN_clear_free(ssh1_challenge);
1292 ssh1_challenge = NULL;
1293 monitor_reset_key_state();
1294
1295 buffer_clear(m);
1296 buffer_put_int(m, success);
1297 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1298
1299 return (success);
1300}
1301
Damien Millerd94e5492002-09-27 13:25:58 +10001302#ifdef KRB4
1303int
1304mm_answer_krb4(int socket, Buffer *m)
1305{
1306 KTEXT_ST auth, reply;
1307 char *client, *p;
1308 int success;
1309 u_int alen;
1310
1311 reply.length = auth.length = 0;
1312
1313 p = buffer_get_string(m, &alen);
1314 if (alen >= MAX_KTXT_LEN)
1315 fatal("%s: auth too large", __func__);
1316 memcpy(auth.dat, p, alen);
1317 auth.length = alen;
1318 memset(p, 0, alen);
1319 xfree(p);
1320
1321 success = options.kerberos_authentication &&
1322 authctxt->valid &&
1323 auth_krb4(authctxt, &auth, &client, &reply);
1324
1325 memset(auth.dat, 0, alen);
1326 buffer_clear(m);
1327 buffer_put_int(m, success);
1328
1329 if (success) {
1330 buffer_put_cstring(m, client);
1331 buffer_put_string(m, reply.dat, reply.length);
1332 if (client)
1333 xfree(client);
1334 if (reply.length)
1335 memset(reply.dat, 0, reply.length);
1336 }
1337
1338 debug3("%s: sending result %d", __func__, success);
1339 mm_request_send(socket, MONITOR_ANS_KRB4, m);
1340
1341 auth_method = "kerberos";
1342
1343 /* Causes monitor loop to terminate if authenticated */
1344 return (success);
1345}
1346#endif
Damien Miller25162f22002-09-12 09:47:29 +10001347
1348#ifdef KRB5
1349int
1350mm_answer_krb5(int socket, Buffer *m)
1351{
1352 krb5_data tkt, reply;
1353 char *client_user;
1354 u_int len;
1355 int success;
1356
1357 /* use temporary var to avoid size issues on 64bit arch */
1358 tkt.data = buffer_get_string(m, &len);
1359 tkt.length = len;
1360
Damien Milleref73f502002-09-25 12:20:17 +10001361 success = options.kerberos_authentication &&
1362 authctxt->valid &&
Damien Miller7db40c92002-09-25 12:19:39 +10001363 auth_krb5(authctxt, &tkt, &client_user, &reply);
Damien Miller25162f22002-09-12 09:47:29 +10001364
1365 if (tkt.length)
1366 xfree(tkt.data);
1367
1368 buffer_clear(m);
1369 buffer_put_int(m, success);
1370
1371 if (success) {
1372 buffer_put_cstring(m, client_user);
1373 buffer_put_string(m, reply.data, reply.length);
1374 if (client_user)
1375 xfree(client_user);
1376 if (reply.length)
1377 xfree(reply.data);
1378 }
1379 mm_request_send(socket, MONITOR_ANS_KRB5, m);
1380
1381 return success;
1382}
1383#endif
1384
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001385int
1386mm_answer_term(int socket, Buffer *req)
1387{
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001388 extern struct monitor *pmonitor;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001389 int res, status;
1390
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001391 debug3("%s: tearing down sessions", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001392
1393 /* The child is terminating */
1394 session_destroy_all(&mm_session_close);
1395
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001396 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
Ben Lindstrom47fd8112002-04-02 20:48:19 +00001397 if (errno != EINTR)
1398 exit(1);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001399
1400 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1401
1402 /* Terminate process */
1403 exit (res);
1404}
1405
1406void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001407monitor_apply_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001408{
1409 if (compat20) {
1410 set_newkeys(MODE_IN);
1411 set_newkeys(MODE_OUT);
1412 } else {
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001413 packet_set_protocol_flags(child_state.ssh1protoflags);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001414 packet_set_encryption_key(child_state.ssh1key,
1415 child_state.ssh1keylen, child_state.ssh1cipher);
1416 xfree(child_state.ssh1key);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001417 }
1418
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001419 /* for rc4 and other stateful ciphers */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001420 packet_set_keycontext(MODE_OUT, child_state.keyout);
1421 xfree(child_state.keyout);
1422 packet_set_keycontext(MODE_IN, child_state.keyin);
1423 xfree(child_state.keyin);
1424
1425 if (!compat20) {
1426 packet_set_iv(MODE_OUT, child_state.ivout);
1427 xfree(child_state.ivout);
1428 packet_set_iv(MODE_IN, child_state.ivin);
1429 xfree(child_state.ivin);
1430 }
1431
1432 memcpy(&incoming_stream, &child_state.incoming,
1433 sizeof(incoming_stream));
1434 memcpy(&outgoing_stream, &child_state.outgoing,
1435 sizeof(outgoing_stream));
1436
1437 /* Update with new address */
Damien Miller2d6b8332002-06-21 15:59:49 +10001438 if (options.compression)
1439 mm_init_compression(pmonitor->m_zlib);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001440
1441 /* Network I/O buffers */
1442 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1443 buffer_clear(&input);
1444 buffer_append(&input, child_state.input, child_state.ilen);
1445 memset(child_state.input, 0, child_state.ilen);
1446 xfree(child_state.input);
1447
1448 buffer_clear(&output);
1449 buffer_append(&output, child_state.output, child_state.olen);
1450 memset(child_state.output, 0, child_state.olen);
1451 xfree(child_state.output);
1452}
1453
1454static Kex *
1455mm_get_kex(Buffer *m)
1456{
1457 Kex *kex;
1458 void *blob;
1459 u_int bloblen;
1460
1461 kex = xmalloc(sizeof(*kex));
1462 memset(kex, 0, sizeof(*kex));
1463 kex->session_id = buffer_get_string(m, &kex->session_id_len);
Ben Lindstromf67e0772002-06-06 20:58:19 +00001464 if ((session_id2 == NULL) ||
1465 (kex->session_id_len != session_id2_len) ||
1466 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1467 fatal("mm_get_get: internal error: bad session id");
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001468 kex->we_need = buffer_get_int(m);
Damien Millerb062c292003-03-24 09:12:09 +11001469 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1470 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001471 kex->server = 1;
1472 kex->hostkey_type = buffer_get_int(m);
1473 kex->kex_type = buffer_get_int(m);
1474 blob = buffer_get_string(m, &bloblen);
1475 buffer_init(&kex->my);
1476 buffer_append(&kex->my, blob, bloblen);
1477 xfree(blob);
1478 blob = buffer_get_string(m, &bloblen);
1479 buffer_init(&kex->peer);
1480 buffer_append(&kex->peer, blob, bloblen);
1481 xfree(blob);
1482 kex->done = 1;
1483 kex->flags = buffer_get_int(m);
1484 kex->client_version_string = buffer_get_string(m, NULL);
1485 kex->server_version_string = buffer_get_string(m, NULL);
1486 kex->load_host_key=&get_hostkey_by_type;
1487 kex->host_key_index=&get_hostkey_index;
1488
1489 return (kex);
1490}
1491
1492/* This function requries careful sanity checking */
1493
1494void
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001495mm_get_keystate(struct monitor *pmonitor)
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001496{
1497 Buffer m;
1498 u_char *blob, *p;
1499 u_int bloblen, plen;
1500
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001501 debug3("%s: Waiting for new keys", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001502
1503 buffer_init(&m);
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001504 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001505 if (!compat20) {
1506 child_state.ssh1protoflags = buffer_get_int(&m);
1507 child_state.ssh1cipher = buffer_get_int(&m);
Ben Lindstrom402c6cc2002-06-21 00:43:42 +00001508 child_state.ssh1key = buffer_get_string(&m,
1509 &child_state.ssh1keylen);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001510 child_state.ivout = buffer_get_string(&m,
1511 &child_state.ivoutlen);
1512 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1513 goto skip;
1514 } else {
1515 /* Get the Kex for rekeying */
Ben Lindstrom7339b2a2002-05-15 16:25:01 +00001516 *pmonitor->m_pkex = mm_get_kex(&m);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001517 }
1518
1519 blob = buffer_get_string(&m, &bloblen);
1520 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1521 xfree(blob);
1522
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001523 debug3("%s: Waiting for second key", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001524 blob = buffer_get_string(&m, &bloblen);
1525 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1526 xfree(blob);
1527
1528 /* Now get sequence numbers for the packets */
1529 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1530 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1531
1532 skip:
1533 /* Get the key context */
1534 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1535 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1536
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001537 debug3("%s: Getting compression state", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001538 /* Get compression state */
1539 p = buffer_get_string(&m, &plen);
1540 if (plen != sizeof(child_state.outgoing))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001541 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001542 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1543 xfree(p);
1544
1545 p = buffer_get_string(&m, &plen);
1546 if (plen != sizeof(child_state.incoming))
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001547 fatal("%s: bad request size", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001548 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1549 xfree(p);
1550
1551 /* Network I/O buffers */
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001552 debug3("%s: Getting Network I/O buffers", __func__);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001553 child_state.input = buffer_get_string(&m, &child_state.ilen);
1554 child_state.output = buffer_get_string(&m, &child_state.olen);
1555
1556 buffer_free(&m);
1557}
1558
1559
1560/* Allocation functions for zlib */
1561void *
1562mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1563{
Ben Lindstrom41ee2b02002-11-09 15:47:47 +00001564 size_t len = (size_t) size * ncount;
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001565 void *address;
1566
Ben Lindstrom0a4f7542002-08-20 18:36:25 +00001567 if (len == 0 || ncount > SIZE_T_MAX / size)
Damien Miller530a7542002-06-26 23:27:11 +10001568 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1569
1570 address = mm_malloc(mm, len);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001571
1572 return (address);
1573}
1574
1575void
1576mm_zfree(struct mm_master *mm, void *address)
1577{
1578 mm_free(mm, address);
1579}
1580
1581void
1582mm_init_compression(struct mm_master *mm)
1583{
1584 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1585 outgoing_stream.zfree = (free_func)mm_zfree;
1586 outgoing_stream.opaque = mm;
1587
1588 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1589 incoming_stream.zfree = (free_func)mm_zfree;
1590 incoming_stream.opaque = mm;
1591}
1592
1593/* XXX */
1594
1595#define FD_CLOSEONEXEC(x) do { \
1596 if (fcntl(x, F_SETFD, 1) == -1) \
1597 fatal("fcntl(%d, F_SETFD)", x); \
1598} while (0)
1599
1600static void
1601monitor_socketpair(int *pair)
1602{
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001603#ifdef HAVE_SOCKETPAIR
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001604 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001605 fatal("%s: socketpair", __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001606#else
1607 fatal("%s: UsePrivilegeSeparation=yes not supported",
Ben Lindstrom7d9c38f2002-06-06 21:40:51 +00001608 __func__);
Kevin Stevesfe6ca542002-04-10 22:04:54 +00001609#endif
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001610 FD_CLOSEONEXEC(pair[0]);
1611 FD_CLOSEONEXEC(pair[1]);
1612}
1613
1614#define MM_MEMSIZE 65536
1615
1616struct monitor *
1617monitor_init(void)
1618{
1619 struct monitor *mon;
1620 int pair[2];
1621
1622 mon = xmalloc(sizeof(*mon));
1623
1624 monitor_socketpair(pair);
1625
1626 mon->m_recvfd = pair[0];
1627 mon->m_sendfd = pair[1];
1628
1629 /* Used to share zlib space across processes */
Damien Miller2d6b8332002-06-21 15:59:49 +10001630 if (options.compression) {
1631 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1632 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001633
Damien Miller2d6b8332002-06-21 15:59:49 +10001634 /* Compression needs to share state across borders */
1635 mm_init_compression(mon->m_zlib);
1636 }
Ben Lindstrom7a2073c2002-03-22 02:30:41 +00001637
1638 return mon;
1639}
1640
1641void
1642monitor_reinit(struct monitor *mon)
1643{
1644 int pair[2];
1645
1646 monitor_socketpair(pair);
1647
1648 mon->m_recvfd = pair[0];
1649 mon->m_sendfd = pair[1];
1650}