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826f3a39 1/*
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"
bfe49944 28RCSID("$OpenBSD: monitor.c,v 1.36 2003/04/01 10:22:21 markus Exp $");
826f3a39 29
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
b59afbfe 62#ifdef GSSAPI
63#include "ssh-gss.h"
64static Gssctxt *gsscontext = NULL;
65#endif
66
826f3a39 67/* Imports */
68extern ServerOptions options;
69extern u_int utmp_len;
70extern Newkeys *current_keys[];
71extern z_stream incoming_stream;
72extern z_stream outgoing_stream;
73extern u_char session_id[];
74extern Buffer input, output;
75extern Buffer auth_debug;
76extern int auth_debug_init;
77
78/* State exported from the child */
79
80struct {
81 z_stream incoming;
82 z_stream outgoing;
83 u_char *keyin;
84 u_int keyinlen;
85 u_char *keyout;
86 u_int keyoutlen;
87 u_char *ivin;
88 u_int ivinlen;
89 u_char *ivout;
90 u_int ivoutlen;
44a053a3 91 u_char *ssh1key;
92 u_int ssh1keylen;
826f3a39 93 int ssh1cipher;
94 int ssh1protoflags;
95 u_char *input;
96 u_int ilen;
97 u_char *output;
98 u_int olen;
99} child_state;
100
101/* Functions on the montior that answer unprivileged requests */
102
103int mm_answer_moduli(int, Buffer *);
104int mm_answer_sign(int, Buffer *);
105int mm_answer_pwnamallow(int, Buffer *);
106int mm_answer_auth2_read_banner(int, Buffer *);
107int mm_answer_authserv(int, Buffer *);
108int mm_answer_authpassword(int, Buffer *);
109int mm_answer_bsdauthquery(int, Buffer *);
110int mm_answer_bsdauthrespond(int, Buffer *);
111int mm_answer_skeyquery(int, Buffer *);
112int mm_answer_skeyrespond(int, Buffer *);
113int mm_answer_keyallowed(int, Buffer *);
114int mm_answer_keyverify(int, Buffer *);
115int mm_answer_pty(int, Buffer *);
116int mm_answer_pty_cleanup(int, Buffer *);
117int mm_answer_term(int, Buffer *);
118int mm_answer_rsa_keyallowed(int, Buffer *);
119int mm_answer_rsa_challenge(int, Buffer *);
120int mm_answer_rsa_response(int, Buffer *);
121int mm_answer_sesskey(int, Buffer *);
122int mm_answer_sessid(int, Buffer *);
123
124#ifdef USE_PAM
125int mm_answer_pam_start(int, Buffer *);
126#endif
127
23987cb8 128#ifdef KRB4
129int mm_answer_krb4(int, Buffer *);
130#endif
131#ifdef KRB5
132int mm_answer_krb5(int, Buffer *);
133#endif
134
b59afbfe 135#ifdef GSSAPI
136int mm_answer_gss_setup_ctx(int, Buffer *);
137int mm_answer_gss_accept_ctx(int, Buffer *);
138int mm_answer_gss_userok(int, Buffer *);
139int mm_answer_gss_localname(int, Buffer *);
140int mm_answer_gss_sign(int, Buffer *);
23987cb8 141int mm_answer_gss_error(int, Buffer *);
e23e524c 142int mm_answer_gss_indicate_mechs(int, Buffer *);
143int mm_answer_gss_localname(int, Buffer *);
b59afbfe 144#endif
145
146#ifdef GSI
147int mm_answer_gsi_gridmap(int, Buffer *);
148#endif
149
826f3a39 150static Authctxt *authctxt;
151static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
152
153/* local state for key verify */
154static u_char *key_blob = NULL;
155static u_int key_bloblen = 0;
156static int key_blobtype = MM_NOKEY;
d03f4262 157static char *hostbased_cuser = NULL;
158static char *hostbased_chost = NULL;
826f3a39 159static char *auth_method = "unknown";
44a053a3 160static int session_id2_len = 0;
161static u_char *session_id2 = NULL;
826f3a39 162
163struct mon_table {
164 enum monitor_reqtype type;
165 int flags;
166 int (*f)(int, Buffer *);
167};
168
169#define MON_ISAUTH 0x0004 /* Required for Authentication */
170#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
171#define MON_ONCE 0x0010 /* Disable after calling */
172
173#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
174
175#define MON_PERMIT 0x1000 /* Request is permitted */
176
177struct mon_table mon_dispatch_proto20[] = {
178 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
179 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
b59afbfe 180 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
826f3a39 181 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
182 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
183 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
184#ifdef USE_PAM
e2447520 185 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
826f3a39 186#endif
187#ifdef BSD_AUTH
188 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
189 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
190#endif
191#ifdef SKEY
192 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
193 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
b59afbfe 194#endif
195#ifdef GSSAPI
196 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
197 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
198 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
e23e524c 199 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
9eeaa28e 200 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
b59afbfe 201 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
e23e524c 202 {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname},
826f3a39 203#endif
204 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
205 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
206 {0, 0, NULL}
207};
208
209struct mon_table mon_dispatch_postauth20[] = {
b59afbfe 210#ifdef GSSAPI
211 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
212 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
213 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
23987cb8 214 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
e23e524c 215 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
b59afbfe 216#endif
826f3a39 217 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
218 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
219 {MONITOR_REQ_PTY, 0, mm_answer_pty},
220 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
221 {MONITOR_REQ_TERM, 0, mm_answer_term},
222 {0, 0, NULL}
223};
224
225struct mon_table mon_dispatch_proto15[] = {
226 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
227 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
228 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
229 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
230 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
231 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
232 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
233 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
826f3a39 234#ifdef BSD_AUTH
235 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
236 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
237#endif
238#ifdef SKEY
239 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
240 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
241#endif
b59afbfe 242#ifdef GSSAPI
243 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
244 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
245 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
246 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
9eeaa28e 247 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
b59afbfe 248#endif
249#ifdef GSI
250 {MONITOR_REQ_GSIGRIDMAP, MON_PERMIT, mm_answer_gsi_gridmap},
251#endif
826f3a39 252#ifdef USE_PAM
e2447520 253 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
d03f4262 254#endif
255#ifdef KRB4
256 {MONITOR_REQ_KRB4, MON_ONCE|MON_AUTH, mm_answer_krb4},
257#endif
258#ifdef KRB5
259 {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5},
826f3a39 260#endif
261 {0, 0, NULL}
262};
263
264struct mon_table mon_dispatch_postauth15[] = {
b59afbfe 265#ifdef GSSAPI
266 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
267 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
268 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
9eeaa28e 269 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
b59afbfe 270#endif
826f3a39 271 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
272 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
273 {MONITOR_REQ_TERM, 0, mm_answer_term},
274 {0, 0, NULL}
275};
276
277struct mon_table *mon_dispatch;
278
279/* Specifies if a certain message is allowed at the moment */
280
281static void
282monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
283{
284 while (ent->f != NULL) {
285 if (ent->type == type) {
286 ent->flags &= ~MON_PERMIT;
287 ent->flags |= permit ? MON_PERMIT : 0;
288 return;
289 }
290 ent++;
291 }
292}
293
294static void
295monitor_permit_authentications(int permit)
296{
297 struct mon_table *ent = mon_dispatch;
298
299 while (ent->f != NULL) {
300 if (ent->flags & MON_AUTH) {
301 ent->flags &= ~MON_PERMIT;
302 ent->flags |= permit ? MON_PERMIT : 0;
303 }
304 ent++;
305 }
306}
307
308Authctxt *
309monitor_child_preauth(struct monitor *pmonitor)
310{
311 struct mon_table *ent;
312 int authenticated = 0;
313
314 debug3("preauth child monitor started");
315
316 if (compat20) {
317 mon_dispatch = mon_dispatch_proto20;
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);
b59afbfe 322#ifdef GSSAPI
323 /* and for the GSSAPI key exchange */
324 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
23987cb8 325 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
e23e524c 326 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
b59afbfe 327#endif
826f3a39 328 } else {
329 mon_dispatch = mon_dispatch_proto15;
330
331 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
b59afbfe 332#ifdef GSSAPI
9eeaa28e 333 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
23987cb8 334 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
b59afbfe 335#endif
336#ifdef GSI
337 monitor_permit(mon_dispatch, MONITOR_REQ_GSIGRIDMAP, 1);
338#endif
826f3a39 339 }
340
341 authctxt = authctxt_new();
342
343 /* The first few requests do not require asynchronous access */
344 while (!authenticated) {
345 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
346 if (authenticated) {
347 if (!(ent->flags & MON_AUTHDECIDE))
348 fatal("%s: unexpected authentication from %d",
44a053a3 349 __func__, ent->type);
826f3a39 350 if (authctxt->pw->pw_uid == 0 &&
351 !auth_root_allowed(auth_method))
352 authenticated = 0;
353#ifdef USE_PAM
354 if (!do_pam_account(authctxt->pw->pw_name, NULL))
355 authenticated = 0;
356#endif
357 }
358
359 if (ent->flags & MON_AUTHDECIDE) {
360 auth_log(authctxt, authenticated, auth_method,
361 compat20 ? " ssh2" : "");
362 if (!authenticated)
363 authctxt->failures++;
364 }
365 }
366
367 if (!authctxt->valid)
44a053a3 368 fatal("%s: authenticated invalid user", __func__);
826f3a39 369
370 debug("%s: %s has been authenticated by privileged process",
44a053a3 371 __func__, authctxt->user);
826f3a39 372
373 mm_get_keystate(pmonitor);
374
375 return (authctxt);
376}
377
378void
379monitor_child_postauth(struct monitor *pmonitor)
380{
381 if (compat20) {
382 mon_dispatch = mon_dispatch_postauth20;
383
384 /* Permit requests for moduli and signatures */
385 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
386 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
387 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
388
e23e524c 389#ifdef GSSAPI
390 /* and for the GSSAPI key exchange */
391 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1);
392 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1);
393 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1);
394#endif
395
826f3a39 396 } else {
397 mon_dispatch = mon_dispatch_postauth15;
398 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
399 }
9eeaa28e 400#ifdef GSSAPI
23987cb8 401 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
9eeaa28e 402#endif
826f3a39 403 if (!no_pty_flag) {
404 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
405 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
406 }
407
408 for (;;)
409 monitor_read(pmonitor, mon_dispatch, NULL);
410}
411
412void
413monitor_sync(struct monitor *pmonitor)
414{
44a053a3 415 if (options.compression) {
416 /* The member allocation is not visible, so sync it */
417 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
418 }
826f3a39 419}
420
421int
422monitor_read(struct monitor *pmonitor, struct mon_table *ent,
423 struct mon_table **pent)
424{
425 Buffer m;
426 int ret;
427 u_char type;
428
429 buffer_init(&m);
430
431 mm_request_receive(pmonitor->m_sendfd, &m);
432 type = buffer_get_char(&m);
433
44a053a3 434 debug3("%s: checking request %d", __func__, type);
826f3a39 435
436 while (ent->f != NULL) {
437 if (ent->type == type)
438 break;
439 ent++;
440 }
441
442 if (ent->f != NULL) {
443 if (!(ent->flags & MON_PERMIT))
44a053a3 444 fatal("%s: unpermitted request %d", __func__,
826f3a39 445 type);
446 ret = (*ent->f)(pmonitor->m_sendfd, &m);
447 buffer_free(&m);
448
449 /* The child may use this request only once, disable it */
450 if (ent->flags & MON_ONCE) {
44a053a3 451 debug2("%s: %d used once, disabling now", __func__,
826f3a39 452 type);
453 ent->flags &= ~MON_PERMIT;
454 }
455
456 if (pent != NULL)
457 *pent = ent;
458
459 return ret;
460 }
461
44a053a3 462 fatal("%s: unsupported request: %d", __func__, type);
826f3a39 463
464 /* NOTREACHED */
465 return (-1);
466}
467
468/* allowed key state */
469static int
470monitor_allowed_key(u_char *blob, u_int bloblen)
471{
472 /* make sure key is allowed */
473 if (key_blob == NULL || key_bloblen != bloblen ||
474 memcmp(key_blob, blob, key_bloblen))
475 return (0);
476 return (1);
477}
478
479static void
480monitor_reset_key_state(void)
481{
482 /* reset state */
483 if (key_blob != NULL)
484 xfree(key_blob);
485 if (hostbased_cuser != NULL)
486 xfree(hostbased_cuser);
487 if (hostbased_chost != NULL)
488 xfree(hostbased_chost);
489 key_blob = NULL;
490 key_bloblen = 0;
491 key_blobtype = MM_NOKEY;
492 hostbased_cuser = NULL;
493 hostbased_chost = NULL;
494}
495
496int
497mm_answer_moduli(int socket, Buffer *m)
498{
499 DH *dh;
500 int min, want, max;
501
502 min = buffer_get_int(m);
503 want = buffer_get_int(m);
504 max = buffer_get_int(m);
505
506 debug3("%s: got parameters: %d %d %d",
44a053a3 507 __func__, min, want, max);
826f3a39 508 /* We need to check here, too, in case the child got corrupted */
509 if (max < min || want < min || max < want)
510 fatal("%s: bad parameters: %d %d %d",
44a053a3 511 __func__, min, want, max);
826f3a39 512
513 buffer_clear(m);
514
515 dh = choose_dh(min, want, max);
516 if (dh == NULL) {
517 buffer_put_char(m, 0);
518 return (0);
519 } else {
520 /* Send first bignum */
521 buffer_put_char(m, 1);
522 buffer_put_bignum2(m, dh->p);
523 buffer_put_bignum2(m, dh->g);
524
525 DH_free(dh);
526 }
527 mm_request_send(socket, MONITOR_ANS_MODULI, m);
528 return (0);
529}
530
531int
532mm_answer_sign(int socket, Buffer *m)
533{
534 Key *key;
535 u_char *p;
536 u_char *signature;
537 u_int siglen, datlen;
538 int keyid;
539
44a053a3 540 debug3("%s", __func__);
826f3a39 541
542 keyid = buffer_get_int(m);
543 p = buffer_get_string(m, &datlen);
544
545 if (datlen != 20)
d03f4262 546 fatal("%s: data length incorrect: %u", __func__, datlen);
44a053a3 547
548 /* save session id, it will be passed on the first call */
549 if (session_id2_len == 0) {
550 session_id2_len = datlen;
551 session_id2 = xmalloc(session_id2_len);
552 memcpy(session_id2, p, session_id2_len);
553 }
826f3a39 554
555 if ((key = get_hostkey_by_index(keyid)) == NULL)
44a053a3 556 fatal("%s: no hostkey from index %d", __func__, keyid);
826f3a39 557 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
44a053a3 558 fatal("%s: key_sign failed", __func__);
826f3a39 559
d03f4262 560 debug3("%s: signature %p(%u)", __func__, signature, siglen);
826f3a39 561
562 buffer_clear(m);
563 buffer_put_string(m, signature, siglen);
564
565 xfree(p);
566 xfree(signature);
567
568 mm_request_send(socket, MONITOR_ANS_SIGN, m);
569
570 /* Turn on permissions for getpwnam */
571 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
572
573 return (0);
574}
575
576/* Retrieves the password entry and also checks if the user is permitted */
577
578int
579mm_answer_pwnamallow(int socket, Buffer *m)
580{
581 char *login;
582 struct passwd *pwent;
583 int allowed = 0;
584
44a053a3 585 debug3("%s", __func__);
826f3a39 586
826f3a39 587 login = buffer_get_string(m, NULL);
588
589 pwent = getpwnamallow(login);
590
b59afbfe 591 if (authctxt->user) xfree(authctxt->user);
826f3a39 592 authctxt->user = xstrdup(login);
593 setproctitle("%s [priv]", pwent ? login : "unknown");
594 xfree(login);
595
596 buffer_clear(m);
597
598 if (pwent == NULL) {
599 buffer_put_char(m, 0);
600 goto out;
601 }
602
603 allowed = 1;
604 authctxt->pw = pwent;
605 authctxt->valid = 1;
606
607 buffer_put_char(m, 1);
608 buffer_put_string(m, pwent, sizeof(struct passwd));
609 buffer_put_cstring(m, pwent->pw_name);
610 buffer_put_cstring(m, "*");
611 buffer_put_cstring(m, pwent->pw_gecos);
612#ifdef HAVE_PW_CLASS_IN_PASSWD
613 buffer_put_cstring(m, pwent->pw_class);
614#endif
615 buffer_put_cstring(m, pwent->pw_dir);
616 buffer_put_cstring(m, pwent->pw_shell);
617
618 out:
44a053a3 619 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
826f3a39 620 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
621
622 /* For SSHv1 allow authentication now */
623 if (!compat20)
624 monitor_permit_authentications(1);
625 else {
626 /* Allow service/style information on the auth context */
627 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
628 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
629 }
630
631#ifdef USE_PAM
632 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
633#endif
634
635 return (0);
636}
637
638int mm_answer_auth2_read_banner(int socket, Buffer *m)
639{
640 char *banner;
641
642 buffer_clear(m);
643 banner = auth2_read_banner();
644 buffer_put_cstring(m, banner != NULL ? banner : "");
645 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
646
647 if (banner != NULL)
d03f4262 648 xfree(banner);
826f3a39 649
650 return (0);
651}
652
653int
654mm_answer_authserv(int socket, Buffer *m)
655{
656 monitor_permit_authentications(1);
657
658 authctxt->service = buffer_get_string(m, NULL);
659 authctxt->style = buffer_get_string(m, NULL);
660 debug3("%s: service=%s, style=%s",
44a053a3 661 __func__, authctxt->service, authctxt->style);
826f3a39 662
663 if (strlen(authctxt->style) == 0) {
664 xfree(authctxt->style);
665 authctxt->style = NULL;
666 }
667
668 return (0);
669}
670
671int
672mm_answer_authpassword(int socket, Buffer *m)
673{
674 static int call_count;
675 char *passwd;
d03f4262 676 int authenticated;
677 u_int plen;
826f3a39 678
679 passwd = buffer_get_string(m, &plen);
680 /* Only authenticate if the context is valid */
44a053a3 681 authenticated = options.password_authentication &&
682 authctxt->valid && auth_password(authctxt, passwd);
826f3a39 683 memset(passwd, 0, strlen(passwd));
684 xfree(passwd);
685
686 buffer_clear(m);
687 buffer_put_int(m, authenticated);
688
44a053a3 689 debug3("%s: sending result %d", __func__, authenticated);
826f3a39 690 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
691
692 call_count++;
693 if (plen == 0 && call_count == 1)
694 auth_method = "none";
695 else
696 auth_method = "password";
697
698 /* Causes monitor loop to terminate if authenticated */
699 return (authenticated);
700}
701
702#ifdef BSD_AUTH
703int
704mm_answer_bsdauthquery(int socket, Buffer *m)
705{
706 char *name, *infotxt;
707 u_int numprompts;
708 u_int *echo_on;
709 char **prompts;
bfe49944 710 u_int success;
826f3a39 711
bfe49944 712 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
713 &prompts, &echo_on) < 0 ? 0 : 1;
826f3a39 714
715 buffer_clear(m);
bfe49944 716 buffer_put_int(m, success);
717 if (success)
826f3a39 718 buffer_put_cstring(m, prompts[0]);
719
bfe49944 720 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 721 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
722
bfe49944 723 if (success) {
826f3a39 724 xfree(name);
725 xfree(infotxt);
726 xfree(prompts);
727 xfree(echo_on);
728 }
729
730 return (0);
731}
732
733int
734mm_answer_bsdauthrespond(int socket, Buffer *m)
735{
736 char *response;
737 int authok;
738
739 if (authctxt->as == 0)
44a053a3 740 fatal("%s: no bsd auth session", __func__);
826f3a39 741
742 response = buffer_get_string(m, NULL);
44a053a3 743 authok = options.challenge_response_authentication &&
744 auth_userresponse(authctxt->as, response, 0);
826f3a39 745 authctxt->as = NULL;
44a053a3 746 debug3("%s: <%s> = <%d>", __func__, response, authok);
826f3a39 747 xfree(response);
748
749 buffer_clear(m);
750 buffer_put_int(m, authok);
751
44a053a3 752 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 753 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
754
755 auth_method = "bsdauth";
756
757 return (authok != 0);
758}
759#endif
760
761#ifdef SKEY
762int
763mm_answer_skeyquery(int socket, Buffer *m)
764{
765 struct skey skey;
766 char challenge[1024];
bfe49944 767 u_int success;
826f3a39 768
bfe49944 769 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
826f3a39 770
771 buffer_clear(m);
bfe49944 772 buffer_put_int(m, success);
773 if (success)
826f3a39 774 buffer_put_cstring(m, challenge);
775
bfe49944 776 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 777 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
778
779 return (0);
780}
781
782int
783mm_answer_skeyrespond(int socket, Buffer *m)
784{
785 char *response;
786 int authok;
787
788 response = buffer_get_string(m, NULL);
789
44a053a3 790 authok = (options.challenge_response_authentication &&
791 authctxt->valid &&
826f3a39 792 skey_haskey(authctxt->pw->pw_name) == 0 &&
793 skey_passcheck(authctxt->pw->pw_name, response) != -1);
794
795 xfree(response);
796
797 buffer_clear(m);
798 buffer_put_int(m, authok);
799
44a053a3 800 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 801 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
802
803 auth_method = "skey";
804
805 return (authok != 0);
806}
807#endif
808
809#ifdef USE_PAM
810int
811mm_answer_pam_start(int socket, Buffer *m)
812{
813 char *user;
814
815 user = buffer_get_string(m, NULL);
816
817 start_pam(user);
818
819 xfree(user);
820
821 return (0);
822}
823#endif
824
825static void
826mm_append_debug(Buffer *m)
827{
828 if (auth_debug_init && buffer_len(&auth_debug)) {
44a053a3 829 debug3("%s: Appending debug messages for child", __func__);
826f3a39 830 buffer_append(m, buffer_ptr(&auth_debug),
831 buffer_len(&auth_debug));
832 buffer_clear(&auth_debug);
833 }
834}
835
836int
837mm_answer_keyallowed(int socket, Buffer *m)
838{
839 Key *key;
d03f4262 840 char *cuser, *chost;
841 u_char *blob;
826f3a39 842 u_int bloblen;
843 enum mm_keytype type = 0;
844 int allowed = 0;
845
44a053a3 846 debug3("%s entering", __func__);
826f3a39 847
848 type = buffer_get_int(m);
849 cuser = buffer_get_string(m, NULL);
850 chost = buffer_get_string(m, NULL);
851 blob = buffer_get_string(m, &bloblen);
852
853 key = key_from_blob(blob, bloblen);
854
855 if ((compat20 && type == MM_RSAHOSTKEY) ||
856 (!compat20 && type != MM_RSAHOSTKEY))
44a053a3 857 fatal("%s: key type and protocol mismatch", __func__);
826f3a39 858
44a053a3 859 debug3("%s: key_from_blob: %p", __func__, key);
826f3a39 860
861 if (key != NULL && authctxt->pw != NULL) {
862 switch(type) {
863 case MM_USERKEY:
44a053a3 864 allowed = options.pubkey_authentication &&
865 user_key_allowed(authctxt->pw, key);
826f3a39 866 break;
867 case MM_HOSTKEY:
44a053a3 868 allowed = options.hostbased_authentication &&
869 hostbased_key_allowed(authctxt->pw,
826f3a39 870 cuser, chost, key);
871 break;
872 case MM_RSAHOSTKEY:
873 key->type = KEY_RSA1; /* XXX */
44a053a3 874 allowed = options.rhosts_rsa_authentication &&
875 auth_rhosts_rsa_key_allowed(authctxt->pw,
826f3a39 876 cuser, chost, key);
877 break;
878 default:
44a053a3 879 fatal("%s: unknown key type %d", __func__, type);
826f3a39 880 break;
881 }
826f3a39 882 }
bfe49944 883 if (key != NULL)
884 key_free(key);
826f3a39 885
886 /* clear temporarily storage (used by verify) */
887 monitor_reset_key_state();
888
889 if (allowed) {
890 /* Save temporarily for comparison in verify */
891 key_blob = blob;
892 key_bloblen = bloblen;
893 key_blobtype = type;
894 hostbased_cuser = cuser;
895 hostbased_chost = chost;
896 }
897
898 debug3("%s: key %p is %s",
44a053a3 899 __func__, key, allowed ? "allowed" : "disallowed");
826f3a39 900
901 buffer_clear(m);
902 buffer_put_int(m, allowed);
bfe49944 903 buffer_put_int(m, forced_command != NULL);
826f3a39 904
905 mm_append_debug(m);
906
907 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
908
909 if (type == MM_RSAHOSTKEY)
910 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
911
912 return (0);
913}
914
915static int
916monitor_valid_userblob(u_char *data, u_int datalen)
917{
918 Buffer b;
d03f4262 919 char *p;
826f3a39 920 u_int len;
921 int fail = 0;
826f3a39 922
923 buffer_init(&b);
924 buffer_append(&b, data, datalen);
925
926 if (datafellows & SSH_OLD_SESSIONID) {
44a053a3 927 p = buffer_ptr(&b);
928 len = buffer_len(&b);
929 if ((session_id2 == NULL) ||
930 (len < session_id2_len) ||
931 (memcmp(p, session_id2, session_id2_len) != 0))
932 fail++;
826f3a39 933 buffer_consume(&b, session_id2_len);
934 } else {
44a053a3 935 p = buffer_get_string(&b, &len);
936 if ((session_id2 == NULL) ||
937 (len != session_id2_len) ||
938 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 939 fail++;
44a053a3 940 xfree(p);
826f3a39 941 }
942 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
943 fail++;
944 p = buffer_get_string(&b, NULL);
945 if (strcmp(authctxt->user, p) != 0) {
946 log("wrong user name passed to monitor: expected %s != %.100s",
947 authctxt->user, p);
948 fail++;
949 }
950 xfree(p);
951 buffer_skip_string(&b);
952 if (datafellows & SSH_BUG_PKAUTH) {
953 if (!buffer_get_char(&b))
954 fail++;
955 } else {
956 p = buffer_get_string(&b, NULL);
957 if (strcmp("publickey", p) != 0)
958 fail++;
959 xfree(p);
960 if (!buffer_get_char(&b))
961 fail++;
962 buffer_skip_string(&b);
963 }
964 buffer_skip_string(&b);
965 if (buffer_len(&b) != 0)
966 fail++;
967 buffer_free(&b);
968 return (fail == 0);
969}
970
971static int
d03f4262 972monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
973 char *chost)
826f3a39 974{
975 Buffer b;
d03f4262 976 char *p;
826f3a39 977 u_int len;
978 int fail = 0;
826f3a39 979
980 buffer_init(&b);
981 buffer_append(&b, data, datalen);
982
44a053a3 983 p = buffer_get_string(&b, &len);
984 if ((session_id2 == NULL) ||
985 (len != session_id2_len) ||
986 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 987 fail++;
44a053a3 988 xfree(p);
989
826f3a39 990 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
991 fail++;
992 p = buffer_get_string(&b, NULL);
993 if (strcmp(authctxt->user, p) != 0) {
994 log("wrong user name passed to monitor: expected %s != %.100s",
995 authctxt->user, p);
996 fail++;
997 }
998 xfree(p);
999 buffer_skip_string(&b); /* service */
1000 p = buffer_get_string(&b, NULL);
1001 if (strcmp(p, "hostbased") != 0)
1002 fail++;
1003 xfree(p);
1004 buffer_skip_string(&b); /* pkalg */
1005 buffer_skip_string(&b); /* pkblob */
1006
1007 /* verify client host, strip trailing dot if necessary */
1008 p = buffer_get_string(&b, NULL);
1009 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1010 p[len - 1] = '\0';
1011 if (strcmp(p, chost) != 0)
1012 fail++;
1013 xfree(p);
1014
1015 /* verify client user */
1016 p = buffer_get_string(&b, NULL);
1017 if (strcmp(p, cuser) != 0)
1018 fail++;
1019 xfree(p);
1020
1021 if (buffer_len(&b) != 0)
1022 fail++;
1023 buffer_free(&b);
1024 return (fail == 0);
1025}
1026
1027int
1028mm_answer_keyverify(int socket, Buffer *m)
1029{
1030 Key *key;
1031 u_char *signature, *data, *blob;
1032 u_int signaturelen, datalen, bloblen;
1033 int verified = 0;
1034 int valid_data = 0;
1035
1036 blob = buffer_get_string(m, &bloblen);
1037 signature = buffer_get_string(m, &signaturelen);
1038 data = buffer_get_string(m, &datalen);
1039
1040 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1041 !monitor_allowed_key(blob, bloblen))
44a053a3 1042 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1043
1044 key = key_from_blob(blob, bloblen);
1045 if (key == NULL)
44a053a3 1046 fatal("%s: bad public key blob", __func__);
826f3a39 1047
1048 switch (key_blobtype) {
1049 case MM_USERKEY:
1050 valid_data = monitor_valid_userblob(data, datalen);
1051 break;
1052 case MM_HOSTKEY:
1053 valid_data = monitor_valid_hostbasedblob(data, datalen,
1054 hostbased_cuser, hostbased_chost);
1055 break;
1056 default:
1057 valid_data = 0;
1058 break;
1059 }
1060 if (!valid_data)
44a053a3 1061 fatal("%s: bad signature data blob", __func__);
826f3a39 1062
1063 verified = key_verify(key, signature, signaturelen, data, datalen);
1064 debug3("%s: key %p signature %s",
44a053a3 1065 __func__, key, verified ? "verified" : "unverified");
826f3a39 1066
1067 key_free(key);
1068 xfree(blob);
1069 xfree(signature);
1070 xfree(data);
1071
276b07a3 1072 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1073
826f3a39 1074 monitor_reset_key_state();
1075
1076 buffer_clear(m);
1077 buffer_put_int(m, verified);
1078 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1079
826f3a39 1080 return (verified);
1081}
1082
1083static void
1084mm_record_login(Session *s, struct passwd *pw)
1085{
1086 socklen_t fromlen;
1087 struct sockaddr_storage from;
1088
1089 /*
1090 * Get IP address of client. If the connection is not a socket, let
1091 * the address be 0.0.0.0.
1092 */
1093 memset(&from, 0, sizeof(from));
d03f4262 1094 fromlen = sizeof(from);
826f3a39 1095 if (packet_connection_is_on_socket()) {
826f3a39 1096 if (getpeername(packet_get_connection_in(),
1097 (struct sockaddr *) & from, &fromlen) < 0) {
1098 debug("getpeername: %.100s", strerror(errno));
1099 fatal_cleanup();
1100 }
1101 }
1102 /* Record that there was a login on that tty from the remote host. */
1103 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1104 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
d03f4262 1105 (struct sockaddr *)&from, fromlen);
826f3a39 1106}
1107
1108static void
1109mm_session_close(Session *s)
1110{
44a053a3 1111 debug3("%s: session %d pid %d", __func__, s->self, s->pid);
826f3a39 1112 if (s->ttyfd != -1) {
44a053a3 1113 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
826f3a39 1114 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1115 session_pty_cleanup2(s);
1116 }
1117 s->used = 0;
1118}
1119
1120int
1121mm_answer_pty(int socket, Buffer *m)
1122{
1123 extern struct monitor *pmonitor;
1124 Session *s;
1125 int res, fd0;
1126
44a053a3 1127 debug3("%s entering", __func__);
826f3a39 1128
1129 buffer_clear(m);
1130 s = session_new();
1131 if (s == NULL)
1132 goto error;
1133 s->authctxt = authctxt;
1134 s->pw = authctxt->pw;
1135 s->pid = pmonitor->m_pid;
1136 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1137 if (res == 0)
1138 goto error;
1139 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1140 pty_setowner(authctxt->pw, s->tty);
1141
1142 buffer_put_int(m, 1);
1143 buffer_put_cstring(m, s->tty);
1144 mm_request_send(socket, MONITOR_ANS_PTY, m);
1145
1146 mm_send_fd(socket, s->ptyfd);
1147 mm_send_fd(socket, s->ttyfd);
1148
1149 /* We need to trick ttyslot */
1150 if (dup2(s->ttyfd, 0) == -1)
44a053a3 1151 fatal("%s: dup2", __func__);
826f3a39 1152
1153 mm_record_login(s, authctxt->pw);
1154
1155 /* Now we can close the file descriptor again */
1156 close(0);
1157
1158 /* make sure nothing uses fd 0 */
1159 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
44a053a3 1160 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
826f3a39 1161 if (fd0 != 0)
44a053a3 1162 error("%s: fd0 %d != 0", __func__, fd0);
826f3a39 1163
1164 /* slave is not needed */
1165 close(s->ttyfd);
1166 s->ttyfd = s->ptyfd;
1167 /* no need to dup() because nobody closes ptyfd */
1168 s->ptymaster = s->ptyfd;
1169
44a053a3 1170 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
826f3a39 1171
1172 return (0);
1173
1174 error:
1175 if (s != NULL)
1176 mm_session_close(s);
1177 buffer_put_int(m, 0);
1178 mm_request_send(socket, MONITOR_ANS_PTY, m);
1179 return (0);
1180}
1181
1182int
1183mm_answer_pty_cleanup(int socket, Buffer *m)
1184{
1185 Session *s;
1186 char *tty;
1187
44a053a3 1188 debug3("%s entering", __func__);
826f3a39 1189
1190 tty = buffer_get_string(m, NULL);
1191 if ((s = session_by_tty(tty)) != NULL)
1192 mm_session_close(s);
1193 buffer_clear(m);
1194 xfree(tty);
1195 return (0);
1196}
1197
1198int
1199mm_answer_sesskey(int socket, Buffer *m)
1200{
1201 BIGNUM *p;
1202 int rsafail;
1203
1204 /* Turn off permissions */
1205 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1206
1207 if ((p = BN_new()) == NULL)
44a053a3 1208 fatal("%s: BN_new", __func__);
826f3a39 1209
1210 buffer_get_bignum2(m, p);
1211
1212 rsafail = ssh1_session_key(p);
1213
1214 buffer_clear(m);
1215 buffer_put_int(m, rsafail);
1216 buffer_put_bignum2(m, p);
1217
1218 BN_clear_free(p);
1219
1220 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1221
1222 /* Turn on permissions for sessid passing */
1223 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1224
1225 return (0);
1226}
1227
1228int
1229mm_answer_sessid(int socket, Buffer *m)
1230{
1231 int i;
1232
44a053a3 1233 debug3("%s entering", __func__);
826f3a39 1234
1235 if (buffer_len(m) != 16)
44a053a3 1236 fatal("%s: bad ssh1 session id", __func__);
826f3a39 1237 for (i = 0; i < 16; i++)
1238 session_id[i] = buffer_get_char(m);
1239
1240 /* Turn on permissions for getpwnam */
1241 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1242
1243 return (0);
1244}
1245
1246int
1247mm_answer_rsa_keyallowed(int socket, Buffer *m)
1248{
1249 BIGNUM *client_n;
1250 Key *key = NULL;
1251 u_char *blob = NULL;
1252 u_int blen = 0;
1253 int allowed = 0;
1254
44a053a3 1255 debug3("%s entering", __func__);
826f3a39 1256
44a053a3 1257 if (options.rsa_authentication && authctxt->valid) {
826f3a39 1258 if ((client_n = BN_new()) == NULL)
44a053a3 1259 fatal("%s: BN_new", __func__);
826f3a39 1260 buffer_get_bignum2(m, client_n);
1261 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1262 BN_clear_free(client_n);
1263 }
1264 buffer_clear(m);
1265 buffer_put_int(m, allowed);
bfe49944 1266 buffer_put_int(m, forced_command != NULL);
826f3a39 1267
1268 /* clear temporarily storage (used by generate challenge) */
1269 monitor_reset_key_state();
1270
1271 if (allowed && key != NULL) {
1272 key->type = KEY_RSA; /* cheat for key_to_blob */
1273 if (key_to_blob(key, &blob, &blen) == 0)
44a053a3 1274 fatal("%s: key_to_blob failed", __func__);
826f3a39 1275 buffer_put_string(m, blob, blen);
1276
1277 /* Save temporarily for comparison in verify */
1278 key_blob = blob;
1279 key_bloblen = blen;
1280 key_blobtype = MM_RSAUSERKEY;
826f3a39 1281 }
bfe49944 1282 if (key != NULL)
1283 key_free(key);
826f3a39 1284
1285 mm_append_debug(m);
1286
1287 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1288
1289 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1290 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1291 return (0);
1292}
1293
1294int
1295mm_answer_rsa_challenge(int socket, Buffer *m)
1296{
1297 Key *key = NULL;
1298 u_char *blob;
1299 u_int blen;
1300
44a053a3 1301 debug3("%s entering", __func__);
826f3a39 1302
1303 if (!authctxt->valid)
44a053a3 1304 fatal("%s: authctxt not valid", __func__);
826f3a39 1305 blob = buffer_get_string(m, &blen);
1306 if (!monitor_allowed_key(blob, blen))
44a053a3 1307 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1308 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
44a053a3 1309 fatal("%s: key type mismatch", __func__);
826f3a39 1310 if ((key = key_from_blob(blob, blen)) == NULL)
44a053a3 1311 fatal("%s: received bad key", __func__);
826f3a39 1312
1313 if (ssh1_challenge)
1314 BN_clear_free(ssh1_challenge);
1315 ssh1_challenge = auth_rsa_generate_challenge(key);
1316
1317 buffer_clear(m);
1318 buffer_put_bignum2(m, ssh1_challenge);
1319
44a053a3 1320 debug3("%s sending reply", __func__);
826f3a39 1321 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1322
1323 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
bfe49944 1324
1325 xfree(blob);
1326 key_free(key);
826f3a39 1327 return (0);
1328}
1329
1330int
1331mm_answer_rsa_response(int socket, Buffer *m)
1332{
1333 Key *key = NULL;
1334 u_char *blob, *response;
1335 u_int blen, len;
1336 int success;
1337
44a053a3 1338 debug3("%s entering", __func__);
826f3a39 1339
1340 if (!authctxt->valid)
44a053a3 1341 fatal("%s: authctxt not valid", __func__);
826f3a39 1342 if (ssh1_challenge == NULL)
44a053a3 1343 fatal("%s: no ssh1_challenge", __func__);
826f3a39 1344
1345 blob = buffer_get_string(m, &blen);
1346 if (!monitor_allowed_key(blob, blen))
44a053a3 1347 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1348 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
44a053a3 1349 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
826f3a39 1350 if ((key = key_from_blob(blob, blen)) == NULL)
44a053a3 1351 fatal("%s: received bad key", __func__);
826f3a39 1352 response = buffer_get_string(m, &len);
1353 if (len != 16)
44a053a3 1354 fatal("%s: received bad response to challenge", __func__);
826f3a39 1355 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1356
bfe49944 1357 xfree(blob);
826f3a39 1358 key_free(key);
1359 xfree(response);
1360
1361 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1362
1363 /* reset state */
1364 BN_clear_free(ssh1_challenge);
1365 ssh1_challenge = NULL;
1366 monitor_reset_key_state();
1367
1368 buffer_clear(m);
1369 buffer_put_int(m, success);
1370 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1371
1372 return (success);
1373}
1374
d03f4262 1375#ifdef KRB4
1376int
1377mm_answer_krb4(int socket, Buffer *m)
1378{
1379 KTEXT_ST auth, reply;
1380 char *client, *p;
1381 int success;
1382 u_int alen;
1383
1384 reply.length = auth.length = 0;
1385
1386 p = buffer_get_string(m, &alen);
1387 if (alen >= MAX_KTXT_LEN)
1388 fatal("%s: auth too large", __func__);
1389 memcpy(auth.dat, p, alen);
1390 auth.length = alen;
1391 memset(p, 0, alen);
1392 xfree(p);
1393
1394 success = options.kerberos_authentication &&
1395 authctxt->valid &&
1396 auth_krb4(authctxt, &auth, &client, &reply);
1397
1398 memset(auth.dat, 0, alen);
1399 buffer_clear(m);
1400 buffer_put_int(m, success);
1401
1402 if (success) {
1403 buffer_put_cstring(m, client);
1404 buffer_put_string(m, reply.dat, reply.length);
1405 if (client)
1406 xfree(client);
1407 if (reply.length)
1408 memset(reply.dat, 0, reply.length);
1409 }
1410
1411 debug3("%s: sending result %d", __func__, success);
1412 mm_request_send(socket, MONITOR_ANS_KRB4, m);
1413
1414 auth_method = "kerberos";
1415
1416 /* Causes monitor loop to terminate if authenticated */
1417 return (success);
1418}
1419#endif
1420
1421#ifdef KRB5
1422int
1423mm_answer_krb5(int socket, Buffer *m)
1424{
1425 krb5_data tkt, reply;
1426 char *client_user;
1427 u_int len;
1428 int success;
1429
1430 /* use temporary var to avoid size issues on 64bit arch */
1431 tkt.data = buffer_get_string(m, &len);
1432 tkt.length = len;
1433
1434 success = options.kerberos_authentication &&
1435 authctxt->valid &&
1436 auth_krb5(authctxt, &tkt, &client_user, &reply);
1437
1438 if (tkt.length)
1439 xfree(tkt.data);
1440
1441 buffer_clear(m);
1442 buffer_put_int(m, success);
1443
1444 if (success) {
1445 buffer_put_cstring(m, client_user);
1446 buffer_put_string(m, reply.data, reply.length);
1447 if (client_user)
1448 xfree(client_user);
1449 if (reply.length)
1450 xfree(reply.data);
1451 }
1452 mm_request_send(socket, MONITOR_ANS_KRB5, m);
1453
1454 return success;
1455}
1456#endif
1457
826f3a39 1458int
1459mm_answer_term(int socket, Buffer *req)
1460{
1461 extern struct monitor *pmonitor;
1462 int res, status;
1463
44a053a3 1464 debug3("%s: tearing down sessions", __func__);
826f3a39 1465
1466 /* The child is terminating */
1467 session_destroy_all(&mm_session_close);
1468
1469 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1470 if (errno != EINTR)
1471 exit(1);
1472
1473 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1474
1475 /* Terminate process */
1476 exit (res);
1477}
1478
1479void
1480monitor_apply_keystate(struct monitor *pmonitor)
1481{
1482 if (compat20) {
1483 set_newkeys(MODE_IN);
1484 set_newkeys(MODE_OUT);
1485 } else {
826f3a39 1486 packet_set_protocol_flags(child_state.ssh1protoflags);
44a053a3 1487 packet_set_encryption_key(child_state.ssh1key,
1488 child_state.ssh1keylen, child_state.ssh1cipher);
1489 xfree(child_state.ssh1key);
826f3a39 1490 }
1491
44a053a3 1492 /* for rc4 and other stateful ciphers */
826f3a39 1493 packet_set_keycontext(MODE_OUT, child_state.keyout);
1494 xfree(child_state.keyout);
1495 packet_set_keycontext(MODE_IN, child_state.keyin);
1496 xfree(child_state.keyin);
1497
1498 if (!compat20) {
1499 packet_set_iv(MODE_OUT, child_state.ivout);
1500 xfree(child_state.ivout);
1501 packet_set_iv(MODE_IN, child_state.ivin);
1502 xfree(child_state.ivin);
1503 }
1504
1505 memcpy(&incoming_stream, &child_state.incoming,
1506 sizeof(incoming_stream));
1507 memcpy(&outgoing_stream, &child_state.outgoing,
1508 sizeof(outgoing_stream));
1509
1510 /* Update with new address */
44a053a3 1511 if (options.compression)
1512 mm_init_compression(pmonitor->m_zlib);
826f3a39 1513
1514 /* Network I/O buffers */
1515 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1516 buffer_clear(&input);
1517 buffer_append(&input, child_state.input, child_state.ilen);
1518 memset(child_state.input, 0, child_state.ilen);
1519 xfree(child_state.input);
1520
1521 buffer_clear(&output);
1522 buffer_append(&output, child_state.output, child_state.olen);
1523 memset(child_state.output, 0, child_state.olen);
1524 xfree(child_state.output);
1525}
1526
1527static Kex *
1528mm_get_kex(Buffer *m)
1529{
1530 Kex *kex;
1531 void *blob;
1532 u_int bloblen;
1533
1534 kex = xmalloc(sizeof(*kex));
1535 memset(kex, 0, sizeof(*kex));
1536 kex->session_id = buffer_get_string(m, &kex->session_id_len);
44a053a3 1537 if ((session_id2 == NULL) ||
1538 (kex->session_id_len != session_id2_len) ||
1539 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1540 fatal("mm_get_get: internal error: bad session id");
826f3a39 1541 kex->we_need = buffer_get_int(m);
bfe49944 1542 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1543 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
23987cb8 1544#ifdef GSSAPI
1545 kex->kex[KEX_GSS_GRP1_SHA1] =kexgss_server;
1546#endif
826f3a39 1547 kex->server = 1;
1548 kex->hostkey_type = buffer_get_int(m);
1549 kex->kex_type = buffer_get_int(m);
1550 blob = buffer_get_string(m, &bloblen);
1551 buffer_init(&kex->my);
1552 buffer_append(&kex->my, blob, bloblen);
1553 xfree(blob);
1554 blob = buffer_get_string(m, &bloblen);
1555 buffer_init(&kex->peer);
1556 buffer_append(&kex->peer, blob, bloblen);
1557 xfree(blob);
1558 kex->done = 1;
1559 kex->flags = buffer_get_int(m);
1560 kex->client_version_string = buffer_get_string(m, NULL);
1561 kex->server_version_string = buffer_get_string(m, NULL);
1562 kex->load_host_key=&get_hostkey_by_type;
1563 kex->host_key_index=&get_hostkey_index;
1564
1565 return (kex);
1566}
1567
1568/* This function requries careful sanity checking */
1569
1570void
1571mm_get_keystate(struct monitor *pmonitor)
1572{
1573 Buffer m;
1574 u_char *blob, *p;
1575 u_int bloblen, plen;
1576
44a053a3 1577 debug3("%s: Waiting for new keys", __func__);
826f3a39 1578
1579 buffer_init(&m);
1580 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1581 if (!compat20) {
1582 child_state.ssh1protoflags = buffer_get_int(&m);
1583 child_state.ssh1cipher = buffer_get_int(&m);
44a053a3 1584 child_state.ssh1key = buffer_get_string(&m,
1585 &child_state.ssh1keylen);
826f3a39 1586 child_state.ivout = buffer_get_string(&m,
1587 &child_state.ivoutlen);
1588 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1589 goto skip;
1590 } else {
1591 /* Get the Kex for rekeying */
1592 *pmonitor->m_pkex = mm_get_kex(&m);
1593 }
1594
1595 blob = buffer_get_string(&m, &bloblen);
1596 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1597 xfree(blob);
1598
44a053a3 1599 debug3("%s: Waiting for second key", __func__);
826f3a39 1600 blob = buffer_get_string(&m, &bloblen);
1601 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1602 xfree(blob);
1603
1604 /* Now get sequence numbers for the packets */
1605 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1606 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1607
1608 skip:
1609 /* Get the key context */
1610 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1611 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1612
44a053a3 1613 debug3("%s: Getting compression state", __func__);
826f3a39 1614 /* Get compression state */
1615 p = buffer_get_string(&m, &plen);
1616 if (plen != sizeof(child_state.outgoing))
44a053a3 1617 fatal("%s: bad request size", __func__);
826f3a39 1618 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1619 xfree(p);
1620
1621 p = buffer_get_string(&m, &plen);
1622 if (plen != sizeof(child_state.incoming))
44a053a3 1623 fatal("%s: bad request size", __func__);
826f3a39 1624 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1625 xfree(p);
1626
1627 /* Network I/O buffers */
44a053a3 1628 debug3("%s: Getting Network I/O buffers", __func__);
826f3a39 1629 child_state.input = buffer_get_string(&m, &child_state.ilen);
1630 child_state.output = buffer_get_string(&m, &child_state.olen);
1631
1632 buffer_free(&m);
1633}
1634
1635
1636/* Allocation functions for zlib */
1637void *
1638mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1639{
bfe49944 1640 size_t len = (size_t) size * ncount;
826f3a39 1641 void *address;
1642
d03f4262 1643 if (len == 0 || ncount > SIZE_T_MAX / size)
276b07a3 1644 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1645
1646 address = mm_malloc(mm, len);
826f3a39 1647
1648 return (address);
1649}
1650
1651void
1652mm_zfree(struct mm_master *mm, void *address)
1653{
1654 mm_free(mm, address);
1655}
1656
1657void
1658mm_init_compression(struct mm_master *mm)
1659{
1660 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1661 outgoing_stream.zfree = (free_func)mm_zfree;
1662 outgoing_stream.opaque = mm;
1663
1664 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1665 incoming_stream.zfree = (free_func)mm_zfree;
1666 incoming_stream.opaque = mm;
1667}
1668
1669/* XXX */
1670
1671#define FD_CLOSEONEXEC(x) do { \
1672 if (fcntl(x, F_SETFD, 1) == -1) \
1673 fatal("fcntl(%d, F_SETFD)", x); \
1674} while (0)
1675
1676static void
1677monitor_socketpair(int *pair)
1678{
1679#ifdef HAVE_SOCKETPAIR
1680 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
44a053a3 1681 fatal("%s: socketpair", __func__);
826f3a39 1682#else
1683 fatal("%s: UsePrivilegeSeparation=yes not supported",
44a053a3 1684 __func__);
826f3a39 1685#endif
1686 FD_CLOSEONEXEC(pair[0]);
1687 FD_CLOSEONEXEC(pair[1]);
1688}
1689
1690#define MM_MEMSIZE 65536
1691
1692struct monitor *
1693monitor_init(void)
1694{
1695 struct monitor *mon;
1696 int pair[2];
1697
1698 mon = xmalloc(sizeof(*mon));
1699
1700 monitor_socketpair(pair);
1701
1702 mon->m_recvfd = pair[0];
1703 mon->m_sendfd = pair[1];
1704
1705 /* Used to share zlib space across processes */
44a053a3 1706 if (options.compression) {
1707 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1708 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
826f3a39 1709
44a053a3 1710 /* Compression needs to share state across borders */
1711 mm_init_compression(mon->m_zlib);
1712 }
826f3a39 1713
1714 return mon;
1715}
1716
1717void
1718monitor_reinit(struct monitor *mon)
1719{
1720 int pair[2];
1721
1722 monitor_socketpair(pair);
1723
1724 mon->m_recvfd = pair[0];
1725 mon->m_sendfd = pair[1];
1726}
b59afbfe 1727
1728#ifdef GSSAPI
1729
1730int
1731mm_answer_gss_setup_ctx(int socket, Buffer *m) {
1732 gss_OID_desc oid;
1733 OM_uint32 major;
4b646122 1734 int len;
b59afbfe 1735
4b646122 1736 oid.elements=buffer_get_string(m,&len);
1737 oid.length=len;
b59afbfe 1738
1739 major=ssh_gssapi_server_ctx(&gsscontext,&oid);
1740
1741 xfree(oid.elements);
1742
1743 buffer_clear(m);
1744 buffer_put_int(m,major);
1745
1746 mm_request_send(socket,MONITOR_ANS_GSSSETUP,m);
1747
e23e524c 1748 /* Now we have a context, enable the step and sign */
1749 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP,1);
1750
b59afbfe 1751 return(0);
1752}
1753
1754int
1755mm_answer_gss_accept_ctx(int socket, Buffer *m) {
1756 gss_buffer_desc in,out;
1757 OM_uint32 major,minor;
1758 OM_uint32 flags = 0; /* GSI needs this */
1759
1760 in.value = buffer_get_string(m,&in.length);
1761 major=ssh_gssapi_accept_ctx(gsscontext,&in,&out,&flags);
1762 xfree(in.value);
1763
1764 buffer_clear(m);
1765 buffer_put_int(m, major);
1766 buffer_put_string(m, out.value, out.length);
1767 buffer_put_int(m, flags);
1768 mm_request_send(socket,MONITOR_ANS_GSSSTEP,m);
1769
1770 gss_release_buffer(&minor, &out);
1771
e23e524c 1772 /* Complete - now we can do signing */
1773 if (major==GSS_S_COMPLETE) {
1774 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP,0);
1775 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN,1);
1776 }
b59afbfe 1777 return(0);
1778}
e23e524c 1779
b59afbfe 1780int
1781mm_answer_gss_userok(int socket, Buffer *m) {
1782 int authenticated;
1783
1784 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1785
1786 buffer_clear(m);
1787 buffer_put_int(m, authenticated);
1788
1789 debug3("%s: sending result %d", __func__, authenticated);
1790 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
1791
23987cb8 1792 /* XXX - auth method could also be 'external' */
b59afbfe 1793 auth_method="gssapi";
1794
1795 /* Monitor loop will terminate if authenticated */
1796 return(authenticated);
1797}
23987cb8 1798
b59afbfe 1799int
1800mm_answer_gss_sign(int socket, Buffer *m) {
1801 gss_buffer_desc data,hash;
1802 OM_uint32 major,minor;
1803
1804 data.value = buffer_get_string(m,&data.length);
1805 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1806 if (data.length != 20)
1807 fatal("%s: data length incorrect: %d", __func__, data.length);
1808
1809 /* Save the session ID - only first time round */
1810 if (session_id2_len == 0) {
1811 session_id2_len=data.length;
1812 session_id2 = xmalloc(session_id2_len);
1813 memcpy(session_id2, data.value, session_id2_len);
1814 }
1815 } /* HACK - end */
1816 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1817
1818 xfree(data.value);
1819
1820 buffer_clear(m);
1821 buffer_put_int(m, major);
1822 buffer_put_string(m, hash.value, hash.length);
1823
1824 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1825
1826 gss_release_buffer(&minor,&hash);
1827
1828 /* Turn on permissions for getpwnam */
1829 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1830
1831 return(0);
1832}
1833
e23e524c 1834int
1835mm_answer_gss_error(int socket, Buffer *m) {
1836 OM_uint32 major,minor;
1837 char *msg;
1838
1839 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
1840 buffer_clear(m);
1841 buffer_put_int(m,major);
1842 buffer_put_int(m,minor);
1843 buffer_put_cstring(m,msg);
1844
1845 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
1846
1847 xfree(msg);
1848
1849 return(0);
1850}
1851
9eeaa28e 1852int
1853mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1854 OM_uint32 major,minor;
1855 gss_OID_set mech_set;
1856 int i;
1857
1858 major=gss_indicate_mechs(&minor, &mech_set);
1859
1860 buffer_clear(m);
1861 buffer_put_int(m, major);
1862 buffer_put_int(m, mech_set->count);
1863 for (i=0; i < mech_set->count; i++) {
1864 buffer_put_string(m, mech_set->elements[i].elements,
1865 mech_set->elements[i].length);
1866 }
1867
e23e524c 1868#if !defined(MECHGLUE) /* mechglue memory management bug ??? */
1869 gss_release_oid_set(&minor,&mech_set);
1870#endif
1871
9eeaa28e 1872 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1873
1874 return(0);
1875}
1876
1877int
e23e524c 1878mm_answer_gss_localname(int socket, Buffer *m) {
1879 char *name;
9eeaa28e 1880
e23e524c 1881 ssh_gssapi_localname(&name);
9eeaa28e 1882
e23e524c 1883 buffer_clear(m);
1884 if (name) {
1885 buffer_put_cstring(m, name);
1886 debug3("%s: sending result %s", __func__, name);
1887 xfree(name);
1888 } else {
1889 buffer_put_cstring(m, "");
1890 debug3("%s: sending result \"\"", __func__);
1891 }
1892
1893 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);
9eeaa28e 1894
23987cb8 1895 return(0);
9eeaa28e 1896}
b59afbfe 1897#endif /* GSSAPI */
1898
1899#ifdef GSI
1900
1901int
1902mm_answer_gsi_gridmap(int socket, Buffer *m) {
1903 char *subject, *name;
1904
1905 subject = buffer_get_string(m, NULL);
1906
1907 gsi_gridmap(subject, &name);
1908
1909 buffer_clear(m);
1910 if (name) {
1911 buffer_put_cstring(m, name);
1912 debug3("%s: sending result %s", __func__, name);
1913 xfree(name);
1914 } else {
1915 buffer_put_cstring(m, "");
1916 debug3("%s: sending result \"\"", __func__);
1917 }
1918
1919 mm_request_send(socket, MONITOR_ANS_GSIGRIDMAP, m);
1920
1921 return(0);
1922}
1923
1924#endif /* GSI */
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