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bugfix: mechglue code broke krb5-only build
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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 *);
9eeaa28e 141int mm_answer_gss_indicate_mechs(int, Buffer *);
23987cb8 142int mm_answer_gss_error(int, Buffer *);
b59afbfe 143#endif
144
145#ifdef GSI
146int mm_answer_gsi_gridmap(int, Buffer *);
147#endif
148
826f3a39 149static Authctxt *authctxt;
150static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
151
152/* local state for key verify */
153static u_char *key_blob = NULL;
154static u_int key_bloblen = 0;
155static int key_blobtype = MM_NOKEY;
d03f4262 156static char *hostbased_cuser = NULL;
157static char *hostbased_chost = NULL;
826f3a39 158static char *auth_method = "unknown";
44a053a3 159static int session_id2_len = 0;
160static u_char *session_id2 = NULL;
826f3a39 161
162struct mon_table {
163 enum monitor_reqtype type;
164 int flags;
165 int (*f)(int, Buffer *);
166};
167
168#define MON_ISAUTH 0x0004 /* Required for Authentication */
169#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
170#define MON_ONCE 0x0010 /* Disable after calling */
171
172#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
173
174#define MON_PERMIT 0x1000 /* Request is permitted */
175
176struct mon_table mon_dispatch_proto20[] = {
177 {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
178 {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
b59afbfe 179 {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow},
826f3a39 180 {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
181 {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
182 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
183#ifdef USE_PAM
e2447520 184 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
826f3a39 185#endif
186#ifdef BSD_AUTH
187 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
188 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
189#endif
190#ifdef SKEY
191 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
192 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
b59afbfe 193#endif
194#ifdef GSSAPI
195 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
196 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
197 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
9eeaa28e 198 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
b59afbfe 199 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
200 {MONITOR_REQ_GSSLOCALNAME, MON_AUTH, mm_answer_gss_localname},
23987cb8 201 {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error},
826f3a39 202#endif
203 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
204 {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
205 {0, 0, NULL}
206};
207
208struct mon_table mon_dispatch_postauth20[] = {
b59afbfe 209#ifdef GSSAPI
210 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
211 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
212 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
9eeaa28e 213 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
23987cb8 214 {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error},
b59afbfe 215#endif
826f3a39 216 {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
217 {MONITOR_REQ_SIGN, 0, mm_answer_sign},
218 {MONITOR_REQ_PTY, 0, mm_answer_pty},
219 {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
220 {MONITOR_REQ_TERM, 0, mm_answer_term},
221 {0, 0, NULL}
222};
223
224struct mon_table mon_dispatch_proto15[] = {
225 {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
226 {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
227 {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
228 {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
229 {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
230 {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
231 {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
232 {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
826f3a39 233#ifdef BSD_AUTH
234 {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
235 {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
236#endif
237#ifdef SKEY
238 {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
239 {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
240#endif
b59afbfe 241#ifdef GSSAPI
242 {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
243 {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
244 {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
245 {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
9eeaa28e 246 {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs},
b59afbfe 247#endif
248#ifdef GSI
249 {MONITOR_REQ_GSIGRIDMAP, MON_PERMIT, mm_answer_gsi_gridmap},
250#endif
826f3a39 251#ifdef USE_PAM
e2447520 252 {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start},
d03f4262 253#endif
254#ifdef KRB4
255 {MONITOR_REQ_KRB4, MON_ONCE|MON_AUTH, mm_answer_krb4},
256#endif
257#ifdef KRB5
258 {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5},
826f3a39 259#endif
260 {0, 0, NULL}
261};
262
263struct mon_table mon_dispatch_postauth15[] = {
b59afbfe 264#ifdef GSSAPI
265 {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
266 {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
267 {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
9eeaa28e 268 {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs},
b59afbfe 269#endif
826f3a39 270 {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
271 {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
272 {MONITOR_REQ_TERM, 0, mm_answer_term},
273 {0, 0, NULL}
274};
275
276struct mon_table *mon_dispatch;
277
278/* Specifies if a certain message is allowed at the moment */
279
280static void
281monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
282{
283 while (ent->f != NULL) {
284 if (ent->type == type) {
285 ent->flags &= ~MON_PERMIT;
286 ent->flags |= permit ? MON_PERMIT : 0;
287 return;
288 }
289 ent++;
290 }
291}
292
293static void
294monitor_permit_authentications(int permit)
295{
296 struct mon_table *ent = mon_dispatch;
297
298 while (ent->f != NULL) {
299 if (ent->flags & MON_AUTH) {
300 ent->flags &= ~MON_PERMIT;
301 ent->flags |= permit ? MON_PERMIT : 0;
302 }
303 ent++;
304 }
305}
306
307Authctxt *
308monitor_child_preauth(struct monitor *pmonitor)
309{
310 struct mon_table *ent;
311 int authenticated = 0;
312
313 debug3("preauth child monitor started");
314
315 if (compat20) {
316 mon_dispatch = mon_dispatch_proto20;
317
318 /* Permit requests for moduli and signatures */
319 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
320 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
b59afbfe 321#ifdef GSSAPI
322 /* and for the GSSAPI key exchange */
323 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
324 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
325 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
9eeaa28e 326 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
23987cb8 327 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
b59afbfe 328#endif
826f3a39 329 } else {
330 mon_dispatch = mon_dispatch_proto15;
331
332 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
b59afbfe 333#ifdef GSSAPI
334 monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
9eeaa28e 335 monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1);
23987cb8 336 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
b59afbfe 337#endif
338#ifdef GSI
339 monitor_permit(mon_dispatch, MONITOR_REQ_GSIGRIDMAP, 1);
340#endif
826f3a39 341 }
342
343 authctxt = authctxt_new();
344
345 /* The first few requests do not require asynchronous access */
346 while (!authenticated) {
347 authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
348 if (authenticated) {
349 if (!(ent->flags & MON_AUTHDECIDE))
350 fatal("%s: unexpected authentication from %d",
44a053a3 351 __func__, ent->type);
826f3a39 352 if (authctxt->pw->pw_uid == 0 &&
353 !auth_root_allowed(auth_method))
354 authenticated = 0;
355#ifdef USE_PAM
356 if (!do_pam_account(authctxt->pw->pw_name, NULL))
357 authenticated = 0;
358#endif
359 }
360
361 if (ent->flags & MON_AUTHDECIDE) {
362 auth_log(authctxt, authenticated, auth_method,
363 compat20 ? " ssh2" : "");
364 if (!authenticated)
365 authctxt->failures++;
366 }
367 }
368
369 if (!authctxt->valid)
44a053a3 370 fatal("%s: authenticated invalid user", __func__);
826f3a39 371
372 debug("%s: %s has been authenticated by privileged process",
44a053a3 373 __func__, authctxt->user);
826f3a39 374
375 mm_get_keystate(pmonitor);
376
377 return (authctxt);
378}
379
380void
381monitor_child_postauth(struct monitor *pmonitor)
382{
383 if (compat20) {
384 mon_dispatch = mon_dispatch_postauth20;
385
386 /* Permit requests for moduli and signatures */
387 monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
388 monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
389 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
390
391 } else {
392 mon_dispatch = mon_dispatch_postauth15;
393 monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
394 }
9eeaa28e 395#ifdef GSSAPI
23987cb8 396 monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1);
9eeaa28e 397#endif
826f3a39 398 if (!no_pty_flag) {
399 monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
400 monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
401 }
402
403 for (;;)
404 monitor_read(pmonitor, mon_dispatch, NULL);
405}
406
407void
408monitor_sync(struct monitor *pmonitor)
409{
44a053a3 410 if (options.compression) {
411 /* The member allocation is not visible, so sync it */
412 mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
413 }
826f3a39 414}
415
416int
417monitor_read(struct monitor *pmonitor, struct mon_table *ent,
418 struct mon_table **pent)
419{
420 Buffer m;
421 int ret;
422 u_char type;
423
424 buffer_init(&m);
425
426 mm_request_receive(pmonitor->m_sendfd, &m);
427 type = buffer_get_char(&m);
428
44a053a3 429 debug3("%s: checking request %d", __func__, type);
826f3a39 430
431 while (ent->f != NULL) {
432 if (ent->type == type)
433 break;
434 ent++;
435 }
436
437 if (ent->f != NULL) {
438 if (!(ent->flags & MON_PERMIT))
44a053a3 439 fatal("%s: unpermitted request %d", __func__,
826f3a39 440 type);
441 ret = (*ent->f)(pmonitor->m_sendfd, &m);
442 buffer_free(&m);
443
444 /* The child may use this request only once, disable it */
445 if (ent->flags & MON_ONCE) {
44a053a3 446 debug2("%s: %d used once, disabling now", __func__,
826f3a39 447 type);
448 ent->flags &= ~MON_PERMIT;
449 }
450
451 if (pent != NULL)
452 *pent = ent;
453
454 return ret;
455 }
456
44a053a3 457 fatal("%s: unsupported request: %d", __func__, type);
826f3a39 458
459 /* NOTREACHED */
460 return (-1);
461}
462
463/* allowed key state */
464static int
465monitor_allowed_key(u_char *blob, u_int bloblen)
466{
467 /* make sure key is allowed */
468 if (key_blob == NULL || key_bloblen != bloblen ||
469 memcmp(key_blob, blob, key_bloblen))
470 return (0);
471 return (1);
472}
473
474static void
475monitor_reset_key_state(void)
476{
477 /* reset state */
478 if (key_blob != NULL)
479 xfree(key_blob);
480 if (hostbased_cuser != NULL)
481 xfree(hostbased_cuser);
482 if (hostbased_chost != NULL)
483 xfree(hostbased_chost);
484 key_blob = NULL;
485 key_bloblen = 0;
486 key_blobtype = MM_NOKEY;
487 hostbased_cuser = NULL;
488 hostbased_chost = NULL;
489}
490
491int
492mm_answer_moduli(int socket, Buffer *m)
493{
494 DH *dh;
495 int min, want, max;
496
497 min = buffer_get_int(m);
498 want = buffer_get_int(m);
499 max = buffer_get_int(m);
500
501 debug3("%s: got parameters: %d %d %d",
44a053a3 502 __func__, min, want, max);
826f3a39 503 /* We need to check here, too, in case the child got corrupted */
504 if (max < min || want < min || max < want)
505 fatal("%s: bad parameters: %d %d %d",
44a053a3 506 __func__, min, want, max);
826f3a39 507
508 buffer_clear(m);
509
510 dh = choose_dh(min, want, max);
511 if (dh == NULL) {
512 buffer_put_char(m, 0);
513 return (0);
514 } else {
515 /* Send first bignum */
516 buffer_put_char(m, 1);
517 buffer_put_bignum2(m, dh->p);
518 buffer_put_bignum2(m, dh->g);
519
520 DH_free(dh);
521 }
522 mm_request_send(socket, MONITOR_ANS_MODULI, m);
523 return (0);
524}
525
526int
527mm_answer_sign(int socket, Buffer *m)
528{
529 Key *key;
530 u_char *p;
531 u_char *signature;
532 u_int siglen, datlen;
533 int keyid;
534
44a053a3 535 debug3("%s", __func__);
826f3a39 536
537 keyid = buffer_get_int(m);
538 p = buffer_get_string(m, &datlen);
539
540 if (datlen != 20)
d03f4262 541 fatal("%s: data length incorrect: %u", __func__, datlen);
44a053a3 542
543 /* save session id, it will be passed on the first call */
544 if (session_id2_len == 0) {
545 session_id2_len = datlen;
546 session_id2 = xmalloc(session_id2_len);
547 memcpy(session_id2, p, session_id2_len);
548 }
826f3a39 549
550 if ((key = get_hostkey_by_index(keyid)) == NULL)
44a053a3 551 fatal("%s: no hostkey from index %d", __func__, keyid);
826f3a39 552 if (key_sign(key, &signature, &siglen, p, datlen) < 0)
44a053a3 553 fatal("%s: key_sign failed", __func__);
826f3a39 554
d03f4262 555 debug3("%s: signature %p(%u)", __func__, signature, siglen);
826f3a39 556
557 buffer_clear(m);
558 buffer_put_string(m, signature, siglen);
559
560 xfree(p);
561 xfree(signature);
562
563 mm_request_send(socket, MONITOR_ANS_SIGN, m);
564
565 /* Turn on permissions for getpwnam */
566 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
567
568 return (0);
569}
570
571/* Retrieves the password entry and also checks if the user is permitted */
572
573int
574mm_answer_pwnamallow(int socket, Buffer *m)
575{
576 char *login;
577 struct passwd *pwent;
578 int allowed = 0;
579
44a053a3 580 debug3("%s", __func__);
826f3a39 581
826f3a39 582 login = buffer_get_string(m, NULL);
583
584 pwent = getpwnamallow(login);
585
b59afbfe 586 if (authctxt->user) xfree(authctxt->user);
826f3a39 587 authctxt->user = xstrdup(login);
588 setproctitle("%s [priv]", pwent ? login : "unknown");
589 xfree(login);
590
591 buffer_clear(m);
592
593 if (pwent == NULL) {
594 buffer_put_char(m, 0);
595 goto out;
596 }
597
598 allowed = 1;
599 authctxt->pw = pwent;
600 authctxt->valid = 1;
601
602 buffer_put_char(m, 1);
603 buffer_put_string(m, pwent, sizeof(struct passwd));
604 buffer_put_cstring(m, pwent->pw_name);
605 buffer_put_cstring(m, "*");
606 buffer_put_cstring(m, pwent->pw_gecos);
607#ifdef HAVE_PW_CLASS_IN_PASSWD
608 buffer_put_cstring(m, pwent->pw_class);
609#endif
610 buffer_put_cstring(m, pwent->pw_dir);
611 buffer_put_cstring(m, pwent->pw_shell);
612
613 out:
44a053a3 614 debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
826f3a39 615 mm_request_send(socket, MONITOR_ANS_PWNAM, m);
616
617 /* For SSHv1 allow authentication now */
618 if (!compat20)
619 monitor_permit_authentications(1);
620 else {
621 /* Allow service/style information on the auth context */
622 monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
623 monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
624 }
625
626#ifdef USE_PAM
627 monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
628#endif
629
630 return (0);
631}
632
633int mm_answer_auth2_read_banner(int socket, Buffer *m)
634{
635 char *banner;
636
637 buffer_clear(m);
638 banner = auth2_read_banner();
639 buffer_put_cstring(m, banner != NULL ? banner : "");
640 mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
641
642 if (banner != NULL)
d03f4262 643 xfree(banner);
826f3a39 644
645 return (0);
646}
647
648int
649mm_answer_authserv(int socket, Buffer *m)
650{
651 monitor_permit_authentications(1);
652
653 authctxt->service = buffer_get_string(m, NULL);
654 authctxt->style = buffer_get_string(m, NULL);
655 debug3("%s: service=%s, style=%s",
44a053a3 656 __func__, authctxt->service, authctxt->style);
826f3a39 657
658 if (strlen(authctxt->style) == 0) {
659 xfree(authctxt->style);
660 authctxt->style = NULL;
661 }
662
663 return (0);
664}
665
666int
667mm_answer_authpassword(int socket, Buffer *m)
668{
669 static int call_count;
670 char *passwd;
d03f4262 671 int authenticated;
672 u_int plen;
826f3a39 673
674 passwd = buffer_get_string(m, &plen);
675 /* Only authenticate if the context is valid */
44a053a3 676 authenticated = options.password_authentication &&
677 authctxt->valid && auth_password(authctxt, passwd);
826f3a39 678 memset(passwd, 0, strlen(passwd));
679 xfree(passwd);
680
681 buffer_clear(m);
682 buffer_put_int(m, authenticated);
683
44a053a3 684 debug3("%s: sending result %d", __func__, authenticated);
826f3a39 685 mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
686
687 call_count++;
688 if (plen == 0 && call_count == 1)
689 auth_method = "none";
690 else
691 auth_method = "password";
692
693 /* Causes monitor loop to terminate if authenticated */
694 return (authenticated);
695}
696
697#ifdef BSD_AUTH
698int
699mm_answer_bsdauthquery(int socket, Buffer *m)
700{
701 char *name, *infotxt;
702 u_int numprompts;
703 u_int *echo_on;
704 char **prompts;
bfe49944 705 u_int success;
826f3a39 706
bfe49944 707 success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
708 &prompts, &echo_on) < 0 ? 0 : 1;
826f3a39 709
710 buffer_clear(m);
bfe49944 711 buffer_put_int(m, success);
712 if (success)
826f3a39 713 buffer_put_cstring(m, prompts[0]);
714
bfe49944 715 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 716 mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
717
bfe49944 718 if (success) {
826f3a39 719 xfree(name);
720 xfree(infotxt);
721 xfree(prompts);
722 xfree(echo_on);
723 }
724
725 return (0);
726}
727
728int
729mm_answer_bsdauthrespond(int socket, Buffer *m)
730{
731 char *response;
732 int authok;
733
734 if (authctxt->as == 0)
44a053a3 735 fatal("%s: no bsd auth session", __func__);
826f3a39 736
737 response = buffer_get_string(m, NULL);
44a053a3 738 authok = options.challenge_response_authentication &&
739 auth_userresponse(authctxt->as, response, 0);
826f3a39 740 authctxt->as = NULL;
44a053a3 741 debug3("%s: <%s> = <%d>", __func__, response, authok);
826f3a39 742 xfree(response);
743
744 buffer_clear(m);
745 buffer_put_int(m, authok);
746
44a053a3 747 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 748 mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
749
750 auth_method = "bsdauth";
751
752 return (authok != 0);
753}
754#endif
755
756#ifdef SKEY
757int
758mm_answer_skeyquery(int socket, Buffer *m)
759{
760 struct skey skey;
761 char challenge[1024];
bfe49944 762 u_int success;
826f3a39 763
bfe49944 764 success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1;
826f3a39 765
766 buffer_clear(m);
bfe49944 767 buffer_put_int(m, success);
768 if (success)
826f3a39 769 buffer_put_cstring(m, challenge);
770
bfe49944 771 debug3("%s: sending challenge success: %u", __func__, success);
826f3a39 772 mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
773
774 return (0);
775}
776
777int
778mm_answer_skeyrespond(int socket, Buffer *m)
779{
780 char *response;
781 int authok;
782
783 response = buffer_get_string(m, NULL);
784
44a053a3 785 authok = (options.challenge_response_authentication &&
786 authctxt->valid &&
826f3a39 787 skey_haskey(authctxt->pw->pw_name) == 0 &&
788 skey_passcheck(authctxt->pw->pw_name, response) != -1);
789
790 xfree(response);
791
792 buffer_clear(m);
793 buffer_put_int(m, authok);
794
44a053a3 795 debug3("%s: sending authenticated: %d", __func__, authok);
826f3a39 796 mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
797
798 auth_method = "skey";
799
800 return (authok != 0);
801}
802#endif
803
804#ifdef USE_PAM
805int
806mm_answer_pam_start(int socket, Buffer *m)
807{
808 char *user;
809
810 user = buffer_get_string(m, NULL);
811
812 start_pam(user);
813
814 xfree(user);
815
816 return (0);
817}
818#endif
819
820static void
821mm_append_debug(Buffer *m)
822{
823 if (auth_debug_init && buffer_len(&auth_debug)) {
44a053a3 824 debug3("%s: Appending debug messages for child", __func__);
826f3a39 825 buffer_append(m, buffer_ptr(&auth_debug),
826 buffer_len(&auth_debug));
827 buffer_clear(&auth_debug);
828 }
829}
830
831int
832mm_answer_keyallowed(int socket, Buffer *m)
833{
834 Key *key;
d03f4262 835 char *cuser, *chost;
836 u_char *blob;
826f3a39 837 u_int bloblen;
838 enum mm_keytype type = 0;
839 int allowed = 0;
840
44a053a3 841 debug3("%s entering", __func__);
826f3a39 842
843 type = buffer_get_int(m);
844 cuser = buffer_get_string(m, NULL);
845 chost = buffer_get_string(m, NULL);
846 blob = buffer_get_string(m, &bloblen);
847
848 key = key_from_blob(blob, bloblen);
849
850 if ((compat20 && type == MM_RSAHOSTKEY) ||
851 (!compat20 && type != MM_RSAHOSTKEY))
44a053a3 852 fatal("%s: key type and protocol mismatch", __func__);
826f3a39 853
44a053a3 854 debug3("%s: key_from_blob: %p", __func__, key);
826f3a39 855
856 if (key != NULL && authctxt->pw != NULL) {
857 switch(type) {
858 case MM_USERKEY:
44a053a3 859 allowed = options.pubkey_authentication &&
860 user_key_allowed(authctxt->pw, key);
826f3a39 861 break;
862 case MM_HOSTKEY:
44a053a3 863 allowed = options.hostbased_authentication &&
864 hostbased_key_allowed(authctxt->pw,
826f3a39 865 cuser, chost, key);
866 break;
867 case MM_RSAHOSTKEY:
868 key->type = KEY_RSA1; /* XXX */
44a053a3 869 allowed = options.rhosts_rsa_authentication &&
870 auth_rhosts_rsa_key_allowed(authctxt->pw,
826f3a39 871 cuser, chost, key);
872 break;
873 default:
44a053a3 874 fatal("%s: unknown key type %d", __func__, type);
826f3a39 875 break;
876 }
826f3a39 877 }
bfe49944 878 if (key != NULL)
879 key_free(key);
826f3a39 880
881 /* clear temporarily storage (used by verify) */
882 monitor_reset_key_state();
883
884 if (allowed) {
885 /* Save temporarily for comparison in verify */
886 key_blob = blob;
887 key_bloblen = bloblen;
888 key_blobtype = type;
889 hostbased_cuser = cuser;
890 hostbased_chost = chost;
891 }
892
893 debug3("%s: key %p is %s",
44a053a3 894 __func__, key, allowed ? "allowed" : "disallowed");
826f3a39 895
896 buffer_clear(m);
897 buffer_put_int(m, allowed);
bfe49944 898 buffer_put_int(m, forced_command != NULL);
826f3a39 899
900 mm_append_debug(m);
901
902 mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
903
904 if (type == MM_RSAHOSTKEY)
905 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
906
907 return (0);
908}
909
910static int
911monitor_valid_userblob(u_char *data, u_int datalen)
912{
913 Buffer b;
d03f4262 914 char *p;
826f3a39 915 u_int len;
916 int fail = 0;
826f3a39 917
918 buffer_init(&b);
919 buffer_append(&b, data, datalen);
920
921 if (datafellows & SSH_OLD_SESSIONID) {
44a053a3 922 p = buffer_ptr(&b);
923 len = buffer_len(&b);
924 if ((session_id2 == NULL) ||
925 (len < session_id2_len) ||
926 (memcmp(p, session_id2, session_id2_len) != 0))
927 fail++;
826f3a39 928 buffer_consume(&b, session_id2_len);
929 } else {
44a053a3 930 p = buffer_get_string(&b, &len);
931 if ((session_id2 == NULL) ||
932 (len != session_id2_len) ||
933 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 934 fail++;
44a053a3 935 xfree(p);
826f3a39 936 }
937 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
938 fail++;
939 p = buffer_get_string(&b, NULL);
940 if (strcmp(authctxt->user, p) != 0) {
941 log("wrong user name passed to monitor: expected %s != %.100s",
942 authctxt->user, p);
943 fail++;
944 }
945 xfree(p);
946 buffer_skip_string(&b);
947 if (datafellows & SSH_BUG_PKAUTH) {
948 if (!buffer_get_char(&b))
949 fail++;
950 } else {
951 p = buffer_get_string(&b, NULL);
952 if (strcmp("publickey", p) != 0)
953 fail++;
954 xfree(p);
955 if (!buffer_get_char(&b))
956 fail++;
957 buffer_skip_string(&b);
958 }
959 buffer_skip_string(&b);
960 if (buffer_len(&b) != 0)
961 fail++;
962 buffer_free(&b);
963 return (fail == 0);
964}
965
966static int
d03f4262 967monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
968 char *chost)
826f3a39 969{
970 Buffer b;
d03f4262 971 char *p;
826f3a39 972 u_int len;
973 int fail = 0;
826f3a39 974
975 buffer_init(&b);
976 buffer_append(&b, data, datalen);
977
44a053a3 978 p = buffer_get_string(&b, &len);
979 if ((session_id2 == NULL) ||
980 (len != session_id2_len) ||
981 (memcmp(p, session_id2, session_id2_len) != 0))
826f3a39 982 fail++;
44a053a3 983 xfree(p);
984
826f3a39 985 if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
986 fail++;
987 p = buffer_get_string(&b, NULL);
988 if (strcmp(authctxt->user, p) != 0) {
989 log("wrong user name passed to monitor: expected %s != %.100s",
990 authctxt->user, p);
991 fail++;
992 }
993 xfree(p);
994 buffer_skip_string(&b); /* service */
995 p = buffer_get_string(&b, NULL);
996 if (strcmp(p, "hostbased") != 0)
997 fail++;
998 xfree(p);
999 buffer_skip_string(&b); /* pkalg */
1000 buffer_skip_string(&b); /* pkblob */
1001
1002 /* verify client host, strip trailing dot if necessary */
1003 p = buffer_get_string(&b, NULL);
1004 if (((len = strlen(p)) > 0) && p[len - 1] == '.')
1005 p[len - 1] = '\0';
1006 if (strcmp(p, chost) != 0)
1007 fail++;
1008 xfree(p);
1009
1010 /* verify client user */
1011 p = buffer_get_string(&b, NULL);
1012 if (strcmp(p, cuser) != 0)
1013 fail++;
1014 xfree(p);
1015
1016 if (buffer_len(&b) != 0)
1017 fail++;
1018 buffer_free(&b);
1019 return (fail == 0);
1020}
1021
1022int
1023mm_answer_keyverify(int socket, Buffer *m)
1024{
1025 Key *key;
1026 u_char *signature, *data, *blob;
1027 u_int signaturelen, datalen, bloblen;
1028 int verified = 0;
1029 int valid_data = 0;
1030
1031 blob = buffer_get_string(m, &bloblen);
1032 signature = buffer_get_string(m, &signaturelen);
1033 data = buffer_get_string(m, &datalen);
1034
1035 if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1036 !monitor_allowed_key(blob, bloblen))
44a053a3 1037 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1038
1039 key = key_from_blob(blob, bloblen);
1040 if (key == NULL)
44a053a3 1041 fatal("%s: bad public key blob", __func__);
826f3a39 1042
1043 switch (key_blobtype) {
1044 case MM_USERKEY:
1045 valid_data = monitor_valid_userblob(data, datalen);
1046 break;
1047 case MM_HOSTKEY:
1048 valid_data = monitor_valid_hostbasedblob(data, datalen,
1049 hostbased_cuser, hostbased_chost);
1050 break;
1051 default:
1052 valid_data = 0;
1053 break;
1054 }
1055 if (!valid_data)
44a053a3 1056 fatal("%s: bad signature data blob", __func__);
826f3a39 1057
1058 verified = key_verify(key, signature, signaturelen, data, datalen);
1059 debug3("%s: key %p signature %s",
44a053a3 1060 __func__, key, verified ? "verified" : "unverified");
826f3a39 1061
1062 key_free(key);
1063 xfree(blob);
1064 xfree(signature);
1065 xfree(data);
1066
276b07a3 1067 auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
1068
826f3a39 1069 monitor_reset_key_state();
1070
1071 buffer_clear(m);
1072 buffer_put_int(m, verified);
1073 mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
1074
826f3a39 1075 return (verified);
1076}
1077
1078static void
1079mm_record_login(Session *s, struct passwd *pw)
1080{
1081 socklen_t fromlen;
1082 struct sockaddr_storage from;
1083
1084 /*
1085 * Get IP address of client. If the connection is not a socket, let
1086 * the address be 0.0.0.0.
1087 */
1088 memset(&from, 0, sizeof(from));
d03f4262 1089 fromlen = sizeof(from);
826f3a39 1090 if (packet_connection_is_on_socket()) {
826f3a39 1091 if (getpeername(packet_get_connection_in(),
1092 (struct sockaddr *) & from, &fromlen) < 0) {
1093 debug("getpeername: %.100s", strerror(errno));
1094 fatal_cleanup();
1095 }
1096 }
1097 /* Record that there was a login on that tty from the remote host. */
1098 record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1099 get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
d03f4262 1100 (struct sockaddr *)&from, fromlen);
826f3a39 1101}
1102
1103static void
1104mm_session_close(Session *s)
1105{
44a053a3 1106 debug3("%s: session %d pid %d", __func__, s->self, s->pid);
826f3a39 1107 if (s->ttyfd != -1) {
44a053a3 1108 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
826f3a39 1109 fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
1110 session_pty_cleanup2(s);
1111 }
1112 s->used = 0;
1113}
1114
1115int
1116mm_answer_pty(int socket, Buffer *m)
1117{
1118 extern struct monitor *pmonitor;
1119 Session *s;
1120 int res, fd0;
1121
44a053a3 1122 debug3("%s entering", __func__);
826f3a39 1123
1124 buffer_clear(m);
1125 s = session_new();
1126 if (s == NULL)
1127 goto error;
1128 s->authctxt = authctxt;
1129 s->pw = authctxt->pw;
1130 s->pid = pmonitor->m_pid;
1131 res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1132 if (res == 0)
1133 goto error;
1134 fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1135 pty_setowner(authctxt->pw, s->tty);
1136
1137 buffer_put_int(m, 1);
1138 buffer_put_cstring(m, s->tty);
1139 mm_request_send(socket, MONITOR_ANS_PTY, m);
1140
1141 mm_send_fd(socket, s->ptyfd);
1142 mm_send_fd(socket, s->ttyfd);
1143
1144 /* We need to trick ttyslot */
1145 if (dup2(s->ttyfd, 0) == -1)
44a053a3 1146 fatal("%s: dup2", __func__);
826f3a39 1147
1148 mm_record_login(s, authctxt->pw);
1149
1150 /* Now we can close the file descriptor again */
1151 close(0);
1152
1153 /* make sure nothing uses fd 0 */
1154 if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
44a053a3 1155 fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
826f3a39 1156 if (fd0 != 0)
44a053a3 1157 error("%s: fd0 %d != 0", __func__, fd0);
826f3a39 1158
1159 /* slave is not needed */
1160 close(s->ttyfd);
1161 s->ttyfd = s->ptyfd;
1162 /* no need to dup() because nobody closes ptyfd */
1163 s->ptymaster = s->ptyfd;
1164
44a053a3 1165 debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
826f3a39 1166
1167 return (0);
1168
1169 error:
1170 if (s != NULL)
1171 mm_session_close(s);
1172 buffer_put_int(m, 0);
1173 mm_request_send(socket, MONITOR_ANS_PTY, m);
1174 return (0);
1175}
1176
1177int
1178mm_answer_pty_cleanup(int socket, Buffer *m)
1179{
1180 Session *s;
1181 char *tty;
1182
44a053a3 1183 debug3("%s entering", __func__);
826f3a39 1184
1185 tty = buffer_get_string(m, NULL);
1186 if ((s = session_by_tty(tty)) != NULL)
1187 mm_session_close(s);
1188 buffer_clear(m);
1189 xfree(tty);
1190 return (0);
1191}
1192
1193int
1194mm_answer_sesskey(int socket, Buffer *m)
1195{
1196 BIGNUM *p;
1197 int rsafail;
1198
1199 /* Turn off permissions */
1200 monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1201
1202 if ((p = BN_new()) == NULL)
44a053a3 1203 fatal("%s: BN_new", __func__);
826f3a39 1204
1205 buffer_get_bignum2(m, p);
1206
1207 rsafail = ssh1_session_key(p);
1208
1209 buffer_clear(m);
1210 buffer_put_int(m, rsafail);
1211 buffer_put_bignum2(m, p);
1212
1213 BN_clear_free(p);
1214
1215 mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1216
1217 /* Turn on permissions for sessid passing */
1218 monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1219
1220 return (0);
1221}
1222
1223int
1224mm_answer_sessid(int socket, Buffer *m)
1225{
1226 int i;
1227
44a053a3 1228 debug3("%s entering", __func__);
826f3a39 1229
1230 if (buffer_len(m) != 16)
44a053a3 1231 fatal("%s: bad ssh1 session id", __func__);
826f3a39 1232 for (i = 0; i < 16; i++)
1233 session_id[i] = buffer_get_char(m);
1234
1235 /* Turn on permissions for getpwnam */
1236 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1237
1238 return (0);
1239}
1240
1241int
1242mm_answer_rsa_keyallowed(int socket, Buffer *m)
1243{
1244 BIGNUM *client_n;
1245 Key *key = NULL;
1246 u_char *blob = NULL;
1247 u_int blen = 0;
1248 int allowed = 0;
1249
44a053a3 1250 debug3("%s entering", __func__);
826f3a39 1251
44a053a3 1252 if (options.rsa_authentication && authctxt->valid) {
826f3a39 1253 if ((client_n = BN_new()) == NULL)
44a053a3 1254 fatal("%s: BN_new", __func__);
826f3a39 1255 buffer_get_bignum2(m, client_n);
1256 allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1257 BN_clear_free(client_n);
1258 }
1259 buffer_clear(m);
1260 buffer_put_int(m, allowed);
bfe49944 1261 buffer_put_int(m, forced_command != NULL);
826f3a39 1262
1263 /* clear temporarily storage (used by generate challenge) */
1264 monitor_reset_key_state();
1265
1266 if (allowed && key != NULL) {
1267 key->type = KEY_RSA; /* cheat for key_to_blob */
1268 if (key_to_blob(key, &blob, &blen) == 0)
44a053a3 1269 fatal("%s: key_to_blob failed", __func__);
826f3a39 1270 buffer_put_string(m, blob, blen);
1271
1272 /* Save temporarily for comparison in verify */
1273 key_blob = blob;
1274 key_bloblen = blen;
1275 key_blobtype = MM_RSAUSERKEY;
826f3a39 1276 }
bfe49944 1277 if (key != NULL)
1278 key_free(key);
826f3a39 1279
1280 mm_append_debug(m);
1281
1282 mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1283
1284 monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1285 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1286 return (0);
1287}
1288
1289int
1290mm_answer_rsa_challenge(int socket, Buffer *m)
1291{
1292 Key *key = NULL;
1293 u_char *blob;
1294 u_int blen;
1295
44a053a3 1296 debug3("%s entering", __func__);
826f3a39 1297
1298 if (!authctxt->valid)
44a053a3 1299 fatal("%s: authctxt not valid", __func__);
826f3a39 1300 blob = buffer_get_string(m, &blen);
1301 if (!monitor_allowed_key(blob, blen))
44a053a3 1302 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1303 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
44a053a3 1304 fatal("%s: key type mismatch", __func__);
826f3a39 1305 if ((key = key_from_blob(blob, blen)) == NULL)
44a053a3 1306 fatal("%s: received bad key", __func__);
826f3a39 1307
1308 if (ssh1_challenge)
1309 BN_clear_free(ssh1_challenge);
1310 ssh1_challenge = auth_rsa_generate_challenge(key);
1311
1312 buffer_clear(m);
1313 buffer_put_bignum2(m, ssh1_challenge);
1314
44a053a3 1315 debug3("%s sending reply", __func__);
826f3a39 1316 mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1317
1318 monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
bfe49944 1319
1320 xfree(blob);
1321 key_free(key);
826f3a39 1322 return (0);
1323}
1324
1325int
1326mm_answer_rsa_response(int socket, Buffer *m)
1327{
1328 Key *key = NULL;
1329 u_char *blob, *response;
1330 u_int blen, len;
1331 int success;
1332
44a053a3 1333 debug3("%s entering", __func__);
826f3a39 1334
1335 if (!authctxt->valid)
44a053a3 1336 fatal("%s: authctxt not valid", __func__);
826f3a39 1337 if (ssh1_challenge == NULL)
44a053a3 1338 fatal("%s: no ssh1_challenge", __func__);
826f3a39 1339
1340 blob = buffer_get_string(m, &blen);
1341 if (!monitor_allowed_key(blob, blen))
44a053a3 1342 fatal("%s: bad key, not previously allowed", __func__);
826f3a39 1343 if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
44a053a3 1344 fatal("%s: key type mismatch: %d", __func__, key_blobtype);
826f3a39 1345 if ((key = key_from_blob(blob, blen)) == NULL)
44a053a3 1346 fatal("%s: received bad key", __func__);
826f3a39 1347 response = buffer_get_string(m, &len);
1348 if (len != 16)
44a053a3 1349 fatal("%s: received bad response to challenge", __func__);
826f3a39 1350 success = auth_rsa_verify_response(key, ssh1_challenge, response);
1351
bfe49944 1352 xfree(blob);
826f3a39 1353 key_free(key);
1354 xfree(response);
1355
1356 auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1357
1358 /* reset state */
1359 BN_clear_free(ssh1_challenge);
1360 ssh1_challenge = NULL;
1361 monitor_reset_key_state();
1362
1363 buffer_clear(m);
1364 buffer_put_int(m, success);
1365 mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1366
1367 return (success);
1368}
1369
d03f4262 1370#ifdef KRB4
1371int
1372mm_answer_krb4(int socket, Buffer *m)
1373{
1374 KTEXT_ST auth, reply;
1375 char *client, *p;
1376 int success;
1377 u_int alen;
1378
1379 reply.length = auth.length = 0;
1380
1381 p = buffer_get_string(m, &alen);
1382 if (alen >= MAX_KTXT_LEN)
1383 fatal("%s: auth too large", __func__);
1384 memcpy(auth.dat, p, alen);
1385 auth.length = alen;
1386 memset(p, 0, alen);
1387 xfree(p);
1388
1389 success = options.kerberos_authentication &&
1390 authctxt->valid &&
1391 auth_krb4(authctxt, &auth, &client, &reply);
1392
1393 memset(auth.dat, 0, alen);
1394 buffer_clear(m);
1395 buffer_put_int(m, success);
1396
1397 if (success) {
1398 buffer_put_cstring(m, client);
1399 buffer_put_string(m, reply.dat, reply.length);
1400 if (client)
1401 xfree(client);
1402 if (reply.length)
1403 memset(reply.dat, 0, reply.length);
1404 }
1405
1406 debug3("%s: sending result %d", __func__, success);
1407 mm_request_send(socket, MONITOR_ANS_KRB4, m);
1408
1409 auth_method = "kerberos";
1410
1411 /* Causes monitor loop to terminate if authenticated */
1412 return (success);
1413}
1414#endif
1415
1416#ifdef KRB5
1417int
1418mm_answer_krb5(int socket, Buffer *m)
1419{
1420 krb5_data tkt, reply;
1421 char *client_user;
1422 u_int len;
1423 int success;
1424
1425 /* use temporary var to avoid size issues on 64bit arch */
1426 tkt.data = buffer_get_string(m, &len);
1427 tkt.length = len;
1428
1429 success = options.kerberos_authentication &&
1430 authctxt->valid &&
1431 auth_krb5(authctxt, &tkt, &client_user, &reply);
1432
1433 if (tkt.length)
1434 xfree(tkt.data);
1435
1436 buffer_clear(m);
1437 buffer_put_int(m, success);
1438
1439 if (success) {
1440 buffer_put_cstring(m, client_user);
1441 buffer_put_string(m, reply.data, reply.length);
1442 if (client_user)
1443 xfree(client_user);
1444 if (reply.length)
1445 xfree(reply.data);
1446 }
1447 mm_request_send(socket, MONITOR_ANS_KRB5, m);
1448
1449 return success;
1450}
1451#endif
1452
826f3a39 1453int
1454mm_answer_term(int socket, Buffer *req)
1455{
1456 extern struct monitor *pmonitor;
1457 int res, status;
1458
44a053a3 1459 debug3("%s: tearing down sessions", __func__);
826f3a39 1460
1461 /* The child is terminating */
1462 session_destroy_all(&mm_session_close);
1463
1464 while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1465 if (errno != EINTR)
1466 exit(1);
1467
1468 res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1469
1470 /* Terminate process */
1471 exit (res);
1472}
1473
1474void
1475monitor_apply_keystate(struct monitor *pmonitor)
1476{
1477 if (compat20) {
1478 set_newkeys(MODE_IN);
1479 set_newkeys(MODE_OUT);
1480 } else {
826f3a39 1481 packet_set_protocol_flags(child_state.ssh1protoflags);
44a053a3 1482 packet_set_encryption_key(child_state.ssh1key,
1483 child_state.ssh1keylen, child_state.ssh1cipher);
1484 xfree(child_state.ssh1key);
826f3a39 1485 }
1486
44a053a3 1487 /* for rc4 and other stateful ciphers */
826f3a39 1488 packet_set_keycontext(MODE_OUT, child_state.keyout);
1489 xfree(child_state.keyout);
1490 packet_set_keycontext(MODE_IN, child_state.keyin);
1491 xfree(child_state.keyin);
1492
1493 if (!compat20) {
1494 packet_set_iv(MODE_OUT, child_state.ivout);
1495 xfree(child_state.ivout);
1496 packet_set_iv(MODE_IN, child_state.ivin);
1497 xfree(child_state.ivin);
1498 }
1499
1500 memcpy(&incoming_stream, &child_state.incoming,
1501 sizeof(incoming_stream));
1502 memcpy(&outgoing_stream, &child_state.outgoing,
1503 sizeof(outgoing_stream));
1504
1505 /* Update with new address */
44a053a3 1506 if (options.compression)
1507 mm_init_compression(pmonitor->m_zlib);
826f3a39 1508
1509 /* Network I/O buffers */
1510 /* XXX inefficient for large buffers, need: buffer_init_from_string */
1511 buffer_clear(&input);
1512 buffer_append(&input, child_state.input, child_state.ilen);
1513 memset(child_state.input, 0, child_state.ilen);
1514 xfree(child_state.input);
1515
1516 buffer_clear(&output);
1517 buffer_append(&output, child_state.output, child_state.olen);
1518 memset(child_state.output, 0, child_state.olen);
1519 xfree(child_state.output);
1520}
1521
1522static Kex *
1523mm_get_kex(Buffer *m)
1524{
1525 Kex *kex;
1526 void *blob;
1527 u_int bloblen;
1528
1529 kex = xmalloc(sizeof(*kex));
1530 memset(kex, 0, sizeof(*kex));
1531 kex->session_id = buffer_get_string(m, &kex->session_id_len);
44a053a3 1532 if ((session_id2 == NULL) ||
1533 (kex->session_id_len != session_id2_len) ||
1534 (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1535 fatal("mm_get_get: internal error: bad session id");
826f3a39 1536 kex->we_need = buffer_get_int(m);
bfe49944 1537 kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1538 kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
23987cb8 1539#ifdef GSSAPI
1540 kex->kex[KEX_GSS_GRP1_SHA1] =kexgss_server;
1541#endif
826f3a39 1542 kex->server = 1;
1543 kex->hostkey_type = buffer_get_int(m);
1544 kex->kex_type = buffer_get_int(m);
1545 blob = buffer_get_string(m, &bloblen);
1546 buffer_init(&kex->my);
1547 buffer_append(&kex->my, blob, bloblen);
1548 xfree(blob);
1549 blob = buffer_get_string(m, &bloblen);
1550 buffer_init(&kex->peer);
1551 buffer_append(&kex->peer, blob, bloblen);
1552 xfree(blob);
1553 kex->done = 1;
1554 kex->flags = buffer_get_int(m);
1555 kex->client_version_string = buffer_get_string(m, NULL);
1556 kex->server_version_string = buffer_get_string(m, NULL);
1557 kex->load_host_key=&get_hostkey_by_type;
1558 kex->host_key_index=&get_hostkey_index;
1559
1560 return (kex);
1561}
1562
1563/* This function requries careful sanity checking */
1564
1565void
1566mm_get_keystate(struct monitor *pmonitor)
1567{
1568 Buffer m;
1569 u_char *blob, *p;
1570 u_int bloblen, plen;
1571
44a053a3 1572 debug3("%s: Waiting for new keys", __func__);
826f3a39 1573
1574 buffer_init(&m);
1575 mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1576 if (!compat20) {
1577 child_state.ssh1protoflags = buffer_get_int(&m);
1578 child_state.ssh1cipher = buffer_get_int(&m);
44a053a3 1579 child_state.ssh1key = buffer_get_string(&m,
1580 &child_state.ssh1keylen);
826f3a39 1581 child_state.ivout = buffer_get_string(&m,
1582 &child_state.ivoutlen);
1583 child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1584 goto skip;
1585 } else {
1586 /* Get the Kex for rekeying */
1587 *pmonitor->m_pkex = mm_get_kex(&m);
1588 }
1589
1590 blob = buffer_get_string(&m, &bloblen);
1591 current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1592 xfree(blob);
1593
44a053a3 1594 debug3("%s: Waiting for second key", __func__);
826f3a39 1595 blob = buffer_get_string(&m, &bloblen);
1596 current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1597 xfree(blob);
1598
1599 /* Now get sequence numbers for the packets */
1600 packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1601 packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1602
1603 skip:
1604 /* Get the key context */
1605 child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1606 child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1607
44a053a3 1608 debug3("%s: Getting compression state", __func__);
826f3a39 1609 /* Get compression state */
1610 p = buffer_get_string(&m, &plen);
1611 if (plen != sizeof(child_state.outgoing))
44a053a3 1612 fatal("%s: bad request size", __func__);
826f3a39 1613 memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1614 xfree(p);
1615
1616 p = buffer_get_string(&m, &plen);
1617 if (plen != sizeof(child_state.incoming))
44a053a3 1618 fatal("%s: bad request size", __func__);
826f3a39 1619 memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1620 xfree(p);
1621
1622 /* Network I/O buffers */
44a053a3 1623 debug3("%s: Getting Network I/O buffers", __func__);
826f3a39 1624 child_state.input = buffer_get_string(&m, &child_state.ilen);
1625 child_state.output = buffer_get_string(&m, &child_state.olen);
1626
1627 buffer_free(&m);
1628}
1629
1630
1631/* Allocation functions for zlib */
1632void *
1633mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1634{
bfe49944 1635 size_t len = (size_t) size * ncount;
826f3a39 1636 void *address;
1637
d03f4262 1638 if (len == 0 || ncount > SIZE_T_MAX / size)
276b07a3 1639 fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1640
1641 address = mm_malloc(mm, len);
826f3a39 1642
1643 return (address);
1644}
1645
1646void
1647mm_zfree(struct mm_master *mm, void *address)
1648{
1649 mm_free(mm, address);
1650}
1651
1652void
1653mm_init_compression(struct mm_master *mm)
1654{
1655 outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1656 outgoing_stream.zfree = (free_func)mm_zfree;
1657 outgoing_stream.opaque = mm;
1658
1659 incoming_stream.zalloc = (alloc_func)mm_zalloc;
1660 incoming_stream.zfree = (free_func)mm_zfree;
1661 incoming_stream.opaque = mm;
1662}
1663
1664/* XXX */
1665
1666#define FD_CLOSEONEXEC(x) do { \
1667 if (fcntl(x, F_SETFD, 1) == -1) \
1668 fatal("fcntl(%d, F_SETFD)", x); \
1669} while (0)
1670
1671static void
1672monitor_socketpair(int *pair)
1673{
1674#ifdef HAVE_SOCKETPAIR
1675 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
44a053a3 1676 fatal("%s: socketpair", __func__);
826f3a39 1677#else
1678 fatal("%s: UsePrivilegeSeparation=yes not supported",
44a053a3 1679 __func__);
826f3a39 1680#endif
1681 FD_CLOSEONEXEC(pair[0]);
1682 FD_CLOSEONEXEC(pair[1]);
1683}
1684
1685#define MM_MEMSIZE 65536
1686
1687struct monitor *
1688monitor_init(void)
1689{
1690 struct monitor *mon;
1691 int pair[2];
1692
1693 mon = xmalloc(sizeof(*mon));
1694
1695 monitor_socketpair(pair);
1696
1697 mon->m_recvfd = pair[0];
1698 mon->m_sendfd = pair[1];
1699
1700 /* Used to share zlib space across processes */
44a053a3 1701 if (options.compression) {
1702 mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1703 mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
826f3a39 1704
44a053a3 1705 /* Compression needs to share state across borders */
1706 mm_init_compression(mon->m_zlib);
1707 }
826f3a39 1708
1709 return mon;
1710}
1711
1712void
1713monitor_reinit(struct monitor *mon)
1714{
1715 int pair[2];
1716
1717 monitor_socketpair(pair);
1718
1719 mon->m_recvfd = pair[0];
1720 mon->m_sendfd = pair[1];
1721}
b59afbfe 1722
1723#ifdef GSSAPI
1724
1725int
1726mm_answer_gss_setup_ctx(int socket, Buffer *m) {
1727 gss_OID_desc oid;
1728 OM_uint32 major;
4b646122 1729 int len;
b59afbfe 1730
4b646122 1731 oid.elements=buffer_get_string(m,&len);
1732 oid.length=len;
b59afbfe 1733
1734 major=ssh_gssapi_server_ctx(&gsscontext,&oid);
1735
1736 xfree(oid.elements);
1737
1738 buffer_clear(m);
1739 buffer_put_int(m,major);
1740
1741 mm_request_send(socket,MONITOR_ANS_GSSSETUP,m);
1742
1743 return(0);
1744}
1745
1746int
1747mm_answer_gss_accept_ctx(int socket, Buffer *m) {
1748 gss_buffer_desc in,out;
1749 OM_uint32 major,minor;
1750 OM_uint32 flags = 0; /* GSI needs this */
1751
1752 in.value = buffer_get_string(m,&in.length);
1753 major=ssh_gssapi_accept_ctx(gsscontext,&in,&out,&flags);
1754 xfree(in.value);
1755
1756 buffer_clear(m);
1757 buffer_put_int(m, major);
1758 buffer_put_string(m, out.value, out.length);
1759 buffer_put_int(m, flags);
1760 mm_request_send(socket,MONITOR_ANS_GSSSTEP,m);
1761
1762 gss_release_buffer(&minor, &out);
1763
1764 return(0);
1765}
1766int
1767mm_answer_gss_userok(int socket, Buffer *m) {
1768 int authenticated;
1769
1770 authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1771
1772 buffer_clear(m);
1773 buffer_put_int(m, authenticated);
1774
1775 debug3("%s: sending result %d", __func__, authenticated);
1776 mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m);
1777
23987cb8 1778 /* XXX - auth method could also be 'external' */
b59afbfe 1779 auth_method="gssapi";
1780
1781 /* Monitor loop will terminate if authenticated */
1782 return(authenticated);
1783}
23987cb8 1784
b59afbfe 1785int
1786mm_answer_gss_localname(int socket, Buffer *m) {
1787 char *name;
1788
1789 ssh_gssapi_localname(&name);
1790
1791 buffer_clear(m);
1792 if (name) {
1793 buffer_put_cstring(m, name);
1794 debug3("%s: sending result %s", __func__, name);
1795 xfree(name);
1796 } else {
1797 buffer_put_cstring(m, "");
1798 debug3("%s: sending result \"\"", __func__);
1799 }
1800
1801 mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m);
1802
1803 return(0);
1804}
1805
1806int
1807mm_answer_gss_sign(int socket, Buffer *m) {
1808 gss_buffer_desc data,hash;
1809 OM_uint32 major,minor;
1810
1811 data.value = buffer_get_string(m,&data.length);
1812 if (data.length != 16) { /* HACK - i.e. we are using SSHv1 */
1813 if (data.length != 20)
1814 fatal("%s: data length incorrect: %d", __func__, data.length);
1815
1816 /* Save the session ID - only first time round */
1817 if (session_id2_len == 0) {
1818 session_id2_len=data.length;
1819 session_id2 = xmalloc(session_id2_len);
1820 memcpy(session_id2, data.value, session_id2_len);
1821 }
1822 } /* HACK - end */
1823 major=ssh_gssapi_sign(gsscontext, &data, &hash);
1824
1825 xfree(data.value);
1826
1827 buffer_clear(m);
1828 buffer_put_int(m, major);
1829 buffer_put_string(m, hash.value, hash.length);
1830
1831 mm_request_send(socket,MONITOR_ANS_GSSSIGN,m);
1832
1833 gss_release_buffer(&minor,&hash);
1834
1835 /* Turn on permissions for getpwnam */
1836 monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1837
1838 return(0);
1839}
1840
9eeaa28e 1841int
1842mm_answer_gss_indicate_mechs(int socket, Buffer *m) {
1843 OM_uint32 major,minor;
1844 gss_OID_set mech_set;
1845 int i;
1846
1847 major=gss_indicate_mechs(&minor, &mech_set);
1848
1849 buffer_clear(m);
1850 buffer_put_int(m, major);
1851 buffer_put_int(m, mech_set->count);
1852 for (i=0; i < mech_set->count; i++) {
1853 buffer_put_string(m, mech_set->elements[i].elements,
1854 mech_set->elements[i].length);
1855 }
1856
1857 mm_request_send(socket,MONITOR_ANS_GSSMECHS,m);
1858
1859 return(0);
1860}
1861
1862int
23987cb8 1863mm_answer_gss_error(int socket, Buffer *m) {
1864 OM_uint32 major,minor;
1865 char *msg;
9eeaa28e 1866
23987cb8 1867 msg=ssh_gssapi_last_error(gsscontext,&major,&minor);
9eeaa28e 1868 buffer_clear(m);
23987cb8 1869 buffer_put_int(m,major);
1870 buffer_put_int(m,minor);
1871 buffer_put_cstring(m,msg);
9eeaa28e 1872
23987cb8 1873 mm_request_send(socket,MONITOR_ANS_GSSERR,m);
9eeaa28e 1874
23987cb8 1875 xfree(msg);
1876
1877 return(0);
9eeaa28e 1878}
1879
b59afbfe 1880#endif /* GSSAPI */
1881
1882#ifdef GSI
1883
1884int
1885mm_answer_gsi_gridmap(int socket, Buffer *m) {
1886 char *subject, *name;
1887
1888 subject = buffer_get_string(m, NULL);
1889
1890 gsi_gridmap(subject, &name);
1891
1892 buffer_clear(m);
1893 if (name) {
1894 buffer_put_cstring(m, name);
1895 debug3("%s: sending result %s", __func__, name);
1896 xfree(name);
1897 } else {
1898 buffer_put_cstring(m, "");
1899 debug3("%s: sending result \"\"", __func__);
1900 }
1901
1902 mm_request_send(socket, MONITOR_ANS_GSIGRIDMAP, m);
1903
1904 return(0);
1905}
1906
1907#endif /* GSI */
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