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source: trunk/third/openssh/monitor_wrap.c @ 18763

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Revision 18763, 25.5 KB checked in by zacheiss, 22 years ago (diff)
Merge openssh 3.5p1.

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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"
28	RCSID("$OpenBSD: monitor_wrap.c,v 1.19 2002/09/26 11:38:43 markus Exp $");
29
30	#include <openssl/bn.h>
31	#include <openssl/dh.h>
32
33	#include "ssh.h"
34	#include "dh.h"
35	#include "kex.h"
36	#include "auth.h"
37	#include "buffer.h"
38	#include "bufaux.h"
39	#include "packet.h"
40	#include "mac.h"
41	#include "log.h"
42	#include "zlib.h"
43	#include "monitor.h"
44	#include "monitor_wrap.h"
45	#include "xmalloc.h"
46	#include "atomicio.h"
47	#include "monitor_fdpass.h"
48	#include "getput.h"
49
50	#include "auth.h"
51	#include "channels.h"
52	#include "session.h"
53
54	#ifdef GSSAPI
55	#include "ssh-gss.h"
56	#endif
57
58	/* Imports */
59	extern int compat20;
60	extern Newkeys *newkeys[];
61	extern z_stream incoming_stream;
62	extern z_stream outgoing_stream;
63	extern struct monitor *pmonitor;
64	extern Buffer input, output;
65
66	void
67	mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
68	{
69	u_int mlen = buffer_len(m);
70	u_char buf[5];
71
72	debug3("%s entering: type %d", __func__, type);
73
74	PUT_32BIT(buf, mlen + 1);
75	buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
76	if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf))
77	fatal("%s: write", __func__);
78	if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
79	fatal("%s: write", __func__);
80	}
81
82	void
83	mm_request_receive(int socket, Buffer *m)
84	{
85	u_char buf[4];
86	u_int msg_len;
87	ssize_t res;
88
89	debug3("%s entering", __func__);
90
91	res = atomicio(read, socket, buf, sizeof(buf));
92	if (res != sizeof(buf)) {
93	if (res == 0)
94	fatal_cleanup();
95	fatal("%s: read: %ld", __func__, (long)res);
96	}
97	msg_len = GET_32BIT(buf);
98	if (msg_len > 256 * 1024)
99	fatal("%s: read: bad msg_len %d", __func__, msg_len);
100	buffer_clear(m);
101	buffer_append_space(m, msg_len);
102	res = atomicio(read, socket, buffer_ptr(m), msg_len);
103	if (res != msg_len)
104	fatal("%s: read: %ld != msg_len", __func__, (long)res);
105	}
106
107	void
108	mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
109	{
110	u_char rtype;
111
112	debug3("%s entering: type %d", __func__, type);
113
114	mm_request_receive(socket, m);
115	rtype = buffer_get_char(m);
116	if (rtype != type)
117	fatal("%s: read: rtype %d != type %d", __func__,
118	rtype, type);
119	}
120
121	DH *
122	mm_choose_dh(int min, int nbits, int max)
123	{
124	BIGNUM p, g;
125	int success = 0;
126	Buffer m;
127
128	buffer_init(&m);
129	buffer_put_int(&m, min);
130	buffer_put_int(&m, nbits);
131	buffer_put_int(&m, max);
132
133	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
134
135	debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
136	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
137
138	success = buffer_get_char(&m);
139	if (success == 0)
140	fatal("%s: MONITOR_ANS_MODULI failed", __func__);
141
142	if ((p = BN_new()) == NULL)
143	fatal("%s: BN_new failed", __func__);
144	if ((g = BN_new()) == NULL)
145	fatal("%s: BN_new failed", __func__);
146	buffer_get_bignum2(&m, p);
147	buffer_get_bignum2(&m, g);
148
149	debug3("%s: remaining %d", __func__, buffer_len(&m));
150	buffer_free(&m);
151
152	return (dh_new_group(g, p));
153	}
154
155	int
156	mm_key_sign(Key key, u_char sigp, u_int lenp, u_char *data, u_int datalen)
157	{
158	Kex kex = pmonitor->m_pkex;
159	Buffer m;
160
161	debug3("%s entering", __func__);
162
163	buffer_init(&m);
164	buffer_put_int(&m, kex->host_key_index(key));
165	buffer_put_string(&m, data, datalen);
166
167	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
168
169	debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
170	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
171	*sigp = buffer_get_string(&m, lenp);
172	buffer_free(&m);
173
174	return (0);
175	}
176
177	struct passwd *
178	mm_getpwnamallow(const char *login)
179	{
180	Buffer m;
181	struct passwd *pw;
182	u_int pwlen;
183
184	debug3("%s entering", __func__);
185
186	buffer_init(&m);
187	buffer_put_cstring(&m, login);
188
189	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
190
191	debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
192	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
193
194	if (buffer_get_char(&m) == 0) {
195	buffer_free(&m);
196	return (NULL);
197	}
198	pw = buffer_get_string(&m, &pwlen);
199	if (pwlen != sizeof(struct passwd))
200	fatal("%s: struct passwd size mismatch", __func__);
201	pw->pw_name = buffer_get_string(&m, NULL);
202	pw->pw_passwd = buffer_get_string(&m, NULL);
203	pw->pw_gecos = buffer_get_string(&m, NULL);
204	#ifdef HAVE_PW_CLASS_IN_PASSWD
205	pw->pw_class = buffer_get_string(&m, NULL);
206	#endif
207	pw->pw_dir = buffer_get_string(&m, NULL);
208	pw->pw_shell = buffer_get_string(&m, NULL);
209	buffer_free(&m);
210
211	return (pw);
212	}
213
214	char *mm_auth2_read_banner(void)
215	{
216	Buffer m;
217	char *banner;
218
219	debug3("%s entering", __func__);
220
221	buffer_init(&m);
222	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
223	buffer_clear(&m);
224
225	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m);
226	banner = buffer_get_string(&m, NULL);
227	buffer_free(&m);
228
229	return (banner);
230	}
231
232	/* Inform the privileged process about service and style */
233
234	void
235	mm_inform_authserv(char service, char style)
236	{
237	Buffer m;
238
239	debug3("%s entering", __func__);
240
241	buffer_init(&m);
242	buffer_put_cstring(&m, service);
243	buffer_put_cstring(&m, style ? style : "");
244
245	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
246
247	buffer_free(&m);
248	}
249
250	/* Do the password authentication */
251	int
252	mm_auth_password(Authctxt authctxt, char password)
253	{
254	Buffer m;
255	int authenticated = 0;
256
257	debug3("%s entering", __func__);
258
259	buffer_init(&m);
260	buffer_put_cstring(&m, password);
261	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
262
263	debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
264	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
265
266	authenticated = buffer_get_int(&m);
267
268	buffer_free(&m);
269
270	debug3("%s: user %sauthenticated",
271	__func__, authenticated ? "" : "not ");
272	return (authenticated);
273	}
274
275	int
276	mm_user_key_allowed(struct passwd pw, Key key)
277	{
278	return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
279	}
280
281	int
282	mm_hostbased_key_allowed(struct passwd pw, char user, char *host,
283	Key *key)
284	{
285	return (mm_key_allowed(MM_HOSTKEY, user, host, key));
286	}
287
288	int
289	mm_auth_rhosts_rsa_key_allowed(struct passwd pw, char user,
290	char host, Key key)
291	{
292	int ret;
293
294	key->type = KEY_RSA; /* XXX hack for key_to_blob */
295	ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
296	key->type = KEY_RSA1;
297	return (ret);
298	}
299
300	static void
301	mm_send_debug(Buffer *m)
302	{
303	char *msg;
304
305	while (buffer_len(m)) {
306	msg = buffer_get_string(m, NULL);
307	debug3("%s: Sending debug: %s", __func__, msg);
308	packet_send_debug("%s", msg);
309	xfree(msg);
310	}
311	}
312
313	int
314	mm_key_allowed(enum mm_keytype type, char user, char host, Key *key)
315	{
316	Buffer m;
317	u_char *blob;
318	u_int len;
319	int allowed = 0;
320
321	debug3("%s entering", __func__);
322
323	/* Convert the key to a blob and the pass it over */
324	if (!key_to_blob(key, &blob, &len))
325	return (0);
326
327	buffer_init(&m);
328	buffer_put_int(&m, type);
329	buffer_put_cstring(&m, user ? user : "");
330	buffer_put_cstring(&m, host ? host : "");
331	buffer_put_string(&m, blob, len);
332	xfree(blob);
333
334	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
335
336	debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
337	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
338
339	allowed = buffer_get_int(&m);
340
341	/* Send potential debug messages */
342	mm_send_debug(&m);
343
344	buffer_free(&m);
345
346	return (allowed);
347	}
348
349	/*
350	* This key verify needs to send the key type along, because the
351	* privileged parent makes the decision if the key is allowed
352	* for authentication.
353	*/
354
355	int
356	mm_key_verify(Key key, u_char sig, u_int siglen, u_char *data, u_int datalen)
357	{
358	Buffer m;
359	u_char *blob;
360	u_int len;
361	int verified = 0;
362
363	debug3("%s entering", __func__);
364
365	/* Convert the key to a blob and the pass it over */
366	if (!key_to_blob(key, &blob, &len))
367	return (0);
368
369	buffer_init(&m);
370	buffer_put_string(&m, blob, len);
371	buffer_put_string(&m, sig, siglen);
372	buffer_put_string(&m, data, datalen);
373	xfree(blob);
374
375	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
376
377	debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
378	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
379
380	verified = buffer_get_int(&m);
381
382	buffer_free(&m);
383
384	return (verified);
385	}
386
387	/* Export key state after authentication */
388	Newkeys *
389	mm_newkeys_from_blob(u_char *blob, int blen)
390	{
391	Buffer b;
392	u_int len;
393	Newkeys *newkey = NULL;
394	Enc *enc;
395	Mac *mac;
396	Comp *comp;
397
398	debug3("%s: %p(%d)", __func__, blob, blen);
399	#ifdef DEBUG_PK
400	dump_base64(stderr, blob, blen);
401	#endif
402	buffer_init(&b);
403	buffer_append(&b, blob, blen);
404
405	newkey = xmalloc(sizeof(*newkey));
406	enc = &newkey->enc;
407	mac = &newkey->mac;
408	comp = &newkey->comp;
409
410	/* Enc structure */
411	enc->name = buffer_get_string(&b, NULL);
412	buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
413	enc->enabled = buffer_get_int(&b);
414	enc->block_size = buffer_get_int(&b);
415	enc->key = buffer_get_string(&b, &enc->key_len);
416	enc->iv = buffer_get_string(&b, &len);
417	if (len != enc->block_size)
418	fatal("%s: bad ivlen: expected %u != %u", __func__,
419	enc->block_size, len);
420
421	if (enc->name == NULL \|\| cipher_by_name(enc->name) != enc->cipher)
422	fatal("%s: bad cipher name %s or pointer %p", __func__,
423	enc->name, enc->cipher);
424
425	/* Mac structure */
426	mac->name = buffer_get_string(&b, NULL);
427	if (mac->name == NULL \|\| mac_init(mac, mac->name) == -1)
428	fatal("%s: can not init mac %s", __func__, mac->name);
429	mac->enabled = buffer_get_int(&b);
430	mac->key = buffer_get_string(&b, &len);
431	if (len > mac->key_len)
432	fatal("%s: bad mac key length: %u > %d", __func__, len,
433	mac->key_len);
434	mac->key_len = len;
435
436	/* Comp structure */
437	comp->type = buffer_get_int(&b);
438	comp->enabled = buffer_get_int(&b);
439	comp->name = buffer_get_string(&b, NULL);
440
441	len = buffer_len(&b);
442	if (len != 0)
443	error("newkeys_from_blob: remaining bytes in blob %u", len);
444	buffer_free(&b);
445	return (newkey);
446	}
447
448	int
449	mm_newkeys_to_blob(int mode, u_char *blobp, u_int lenp)
450	{
451	Buffer b;
452	int len;
453	Enc *enc;
454	Mac *mac;
455	Comp *comp;
456	Newkeys *newkey = newkeys[mode];
457
458	debug3("%s: converting %p", __func__, newkey);
459
460	if (newkey == NULL) {
461	error("%s: newkey == NULL", __func__);
462	return 0;
463	}
464	enc = &newkey->enc;
465	mac = &newkey->mac;
466	comp = &newkey->comp;
467
468	buffer_init(&b);
469	/* Enc structure */
470	buffer_put_cstring(&b, enc->name);
471	/* The cipher struct is constant and shared, you export pointer */
472	buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
473	buffer_put_int(&b, enc->enabled);
474	buffer_put_int(&b, enc->block_size);
475	buffer_put_string(&b, enc->key, enc->key_len);
476	packet_get_keyiv(mode, enc->iv, enc->block_size);
477	buffer_put_string(&b, enc->iv, enc->block_size);
478
479	/* Mac structure */
480	buffer_put_cstring(&b, mac->name);
481	buffer_put_int(&b, mac->enabled);
482	buffer_put_string(&b, mac->key, mac->key_len);
483
484	/* Comp structure */
485	buffer_put_int(&b, comp->type);
486	buffer_put_int(&b, comp->enabled);
487	buffer_put_cstring(&b, comp->name);
488
489	len = buffer_len(&b);
490	if (lenp != NULL)
491	*lenp = len;
492	if (blobp != NULL) {
493	*blobp = xmalloc(len);
494	memcpy(*blobp, buffer_ptr(&b), len);
495	}
496	memset(buffer_ptr(&b), 0, len);
497	buffer_free(&b);
498	return len;
499	}
500
501	static void
502	mm_send_kex(Buffer m, Kex kex)
503	{
504	buffer_put_string(m, kex->session_id, kex->session_id_len);
505	buffer_put_int(m, kex->we_need);
506	buffer_put_int(m, kex->hostkey_type);
507	buffer_put_int(m, kex->kex_type);
508	buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
509	buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
510	buffer_put_int(m, kex->flags);
511	buffer_put_cstring(m, kex->client_version_string);
512	buffer_put_cstring(m, kex->server_version_string);
513	}
514
515	void
516	mm_send_keystate(struct monitor *pmonitor)
517	{
518	Buffer m;
519	u_char blob, p;
520	u_int bloblen, plen;
521
522	buffer_init(&m);
523
524	if (!compat20) {
525	u_char iv[24];
526	u_char *key;
527	u_int ivlen, keylen;
528
529	buffer_put_int(&m, packet_get_protocol_flags());
530
531	buffer_put_int(&m, packet_get_ssh1_cipher());
532
533	debug3("%s: Sending ssh1 KEY+IV", __func__);
534	keylen = packet_get_encryption_key(NULL);
535	key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
536	keylen = packet_get_encryption_key(key);
537	buffer_put_string(&m, key, keylen);
538	memset(key, 0, keylen);
539	xfree(key);
540
541	ivlen = packet_get_keyiv_len(MODE_OUT);
542	packet_get_keyiv(MODE_OUT, iv, ivlen);
543	buffer_put_string(&m, iv, ivlen);
544	ivlen = packet_get_keyiv_len(MODE_OUT);
545	packet_get_keyiv(MODE_IN, iv, ivlen);
546	buffer_put_string(&m, iv, ivlen);
547	goto skip;
548	} else {
549	/* Kex for rekeying */
550	mm_send_kex(&m, *pmonitor->m_pkex);
551	}
552
553	debug3("%s: Sending new keys: %p %p",
554	__func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
555
556	/* Keys from Kex */
557	if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
558	fatal("%s: conversion of newkeys failed", __func__);
559
560	buffer_put_string(&m, blob, bloblen);
561	xfree(blob);
562
563	if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
564	fatal("%s: conversion of newkeys failed", __func__);
565
566	buffer_put_string(&m, blob, bloblen);
567	xfree(blob);
568
569	buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
570	buffer_put_int(&m, packet_get_seqnr(MODE_IN));
571
572	debug3("%s: New keys have been sent", __func__);
573	skip:
574	/* More key context */
575	plen = packet_get_keycontext(MODE_OUT, NULL);
576	p = xmalloc(plen+1);
577	packet_get_keycontext(MODE_OUT, p);
578	buffer_put_string(&m, p, plen);
579	xfree(p);
580
581	plen = packet_get_keycontext(MODE_IN, NULL);
582	p = xmalloc(plen+1);
583	packet_get_keycontext(MODE_IN, p);
584	buffer_put_string(&m, p, plen);
585	xfree(p);
586
587	/* Compression state */
588	debug3("%s: Sending compression state", __func__);
589	buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
590	buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
591
592	/* Network I/O buffers */
593	buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
594	buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
595
596	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
597	debug3("%s: Finished sending state", __func__);
598
599	buffer_free(&m);
600	}
601
602	int
603	mm_pty_allocate(int ptyfd, int ttyfd, char *namebuf, int namebuflen)
604	{
605	Buffer m;
606	char *p;
607	int success = 0;
608
609	buffer_init(&m);
610	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
611
612	debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
613	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
614
615	success = buffer_get_int(&m);
616	if (success == 0) {
617	debug3("%s: pty alloc failed", __func__);
618	buffer_free(&m);
619	return (0);
620	}
621	p = buffer_get_string(&m, NULL);
622	buffer_free(&m);
623
624	strlcpy(namebuf, p, namebuflen); /* Possible truncation */
625	xfree(p);
626
627	*ptyfd = mm_receive_fd(pmonitor->m_recvfd);
628	*ttyfd = mm_receive_fd(pmonitor->m_recvfd);
629
630	/* Success */
631	return (1);
632	}
633
634	void
635	mm_session_pty_cleanup2(void *session)
636	{
637	Session *s = session;
638	Buffer m;
639
640	if (s->ttyfd == -1)
641	return;
642	buffer_init(&m);
643	buffer_put_cstring(&m, s->tty);
644	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
645	buffer_free(&m);
646
647	/* closed dup'ed master */
648	if (close(s->ptymaster) < 0)
649	error("close(s->ptymaster): %s", strerror(errno));
650
651	/* unlink pty from session */
652	s->ttyfd = -1;
653	}
654
655	#ifdef USE_PAM
656	void
657	mm_start_pam(char *user)
658	{
659	Buffer m;
660
661	debug3("%s entering", __func__);
662
663	buffer_init(&m);
664	buffer_put_cstring(&m, user);
665
666	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
667
668	buffer_free(&m);
669	}
670	#endif /* USE_PAM */
671
672	/* Request process termination */
673
674	void
675	mm_terminate(void)
676	{
677	Buffer m;
678
679	buffer_init(&m);
680	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
681	buffer_free(&m);
682	}
683
684	int
685	mm_ssh1_session_key(BIGNUM *num)
686	{
687	int rsafail;
688	Buffer m;
689
690	buffer_init(&m);
691	buffer_put_bignum2(&m, num);
692	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
693
694	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
695
696	rsafail = buffer_get_int(&m);
697	buffer_get_bignum2(&m, num);
698
699	buffer_free(&m);
700
701	return (rsafail);
702	}
703
704	static void
705	mm_chall_setup(char name, char infotxt, u_int *numprompts,
706	char *prompts, u_int echo_on)
707	{
708	*name = xstrdup("");
709	*infotxt = xstrdup("");
710	*numprompts = 1;
711	prompts = xmalloc(numprompts * sizeof(char *));
712	echo_on = xmalloc(numprompts * sizeof(u_int));
713	(*echo_on)[0] = 0;
714	}
715
716	int
717	mm_bsdauth_query(void ctx, char name, char *infotxt,
718	u_int numprompts, char prompts, u_int echo_on)
719	{
720	Buffer m;
721	int res;
722	char *challenge;
723
724	debug3("%s: entering", __func__);
725
726	buffer_init(&m);
727	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
728
729	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
730	&m);
731	res = buffer_get_int(&m);
732	if (res == -1) {
733	debug3("%s: no challenge", __func__);
734	buffer_free(&m);
735	return (-1);
736	}
737
738	/* Get the challenge, and format the response */
739	challenge = buffer_get_string(&m, NULL);
740	buffer_free(&m);
741
742	mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
743	(*prompts)[0] = challenge;
744
745	debug3("%s: received challenge: %s", __func__, challenge);
746
747	return (0);
748	}
749
750	int
751	mm_bsdauth_respond(void ctx, u_int numresponses, char *responses)
752	{
753	Buffer m;
754	int authok;
755
756	debug3("%s: entering", __func__);
757	if (numresponses != 1)
758	return (-1);
759
760	buffer_init(&m);
761	buffer_put_cstring(&m, responses[0]);
762	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
763
764	mm_request_receive_expect(pmonitor->m_recvfd,
765	MONITOR_ANS_BSDAUTHRESPOND, &m);
766
767	authok = buffer_get_int(&m);
768	buffer_free(&m);
769
770	return ((authok == 0) ? -1 : 0);
771	}
772
773	int
774	mm_skey_query(void ctx, char name, char *infotxt,
775	u_int numprompts, char prompts, u_int echo_on)
776	{
777	Buffer m;
778	int len, res;
779	char p, challenge;
780
781	debug3("%s: entering", __func__);
782
783	buffer_init(&m);
784	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
785
786	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
787	&m);
788	res = buffer_get_int(&m);
789	if (res == -1) {
790	debug3("%s: no challenge", __func__);
791	buffer_free(&m);
792	return (-1);
793	}
794
795	/* Get the challenge, and format the response */
796	challenge = buffer_get_string(&m, NULL);
797	buffer_free(&m);
798
799	debug3("%s: received challenge: %s", __func__, challenge);
800
801	mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
802
803	len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
804	p = xmalloc(len);
805	strlcpy(p, challenge, len);
806	strlcat(p, SKEY_PROMPT, len);
807	(*prompts)[0] = p;
808	xfree(challenge);
809
810	return (0);
811	}
812
813	int
814	mm_skey_respond(void ctx, u_int numresponses, char *responses)
815	{
816	Buffer m;
817	int authok;
818
819	debug3("%s: entering", __func__);
820	if (numresponses != 1)
821	return (-1);
822
823	buffer_init(&m);
824	buffer_put_cstring(&m, responses[0]);
825	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
826
827	mm_request_receive_expect(pmonitor->m_recvfd,
828	MONITOR_ANS_SKEYRESPOND, &m);
829
830	authok = buffer_get_int(&m);
831	buffer_free(&m);
832
833	return ((authok == 0) ? -1 : 0);
834	}
835
836	void
837	mm_ssh1_session_id(u_char session_id[16])
838	{
839	Buffer m;
840	int i;
841
842	debug3("%s entering", __func__);
843
844	buffer_init(&m);
845	for (i = 0; i < 16; i++)
846	buffer_put_char(&m, session_id[i]);
847
848	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
849	buffer_free(&m);
850	}
851
852	int
853	mm_auth_rsa_key_allowed(struct passwd pw, BIGNUM client_n, Key **rkey)
854	{
855	Buffer m;
856	Key *key;
857	u_char *blob;
858	u_int blen;
859	int allowed = 0;
860
861	debug3("%s entering", __func__);
862
863	buffer_init(&m);
864	buffer_put_bignum2(&m, client_n);
865
866	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
867	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
868
869	allowed = buffer_get_int(&m);
870
871	if (allowed && rkey != NULL) {
872	blob = buffer_get_string(&m, &blen);
873	if ((key = key_from_blob(blob, blen)) == NULL)
874	fatal("%s: key_from_blob failed", __func__);
875	*rkey = key;
876	xfree(blob);
877	}
878	mm_send_debug(&m);
879	buffer_free(&m);
880
881	return (allowed);
882	}
883
884	BIGNUM *
885	mm_auth_rsa_generate_challenge(Key *key)
886	{
887	Buffer m;
888	BIGNUM *challenge;
889	u_char *blob;
890	u_int blen;
891
892	debug3("%s entering", __func__);
893
894	if ((challenge = BN_new()) == NULL)
895	fatal("%s: BN_new failed", __func__);
896
897	key->type = KEY_RSA; /* XXX cheat for key_to_blob */
898	if (key_to_blob(key, &blob, &blen) == 0)
899	fatal("%s: key_to_blob failed", __func__);
900	key->type = KEY_RSA1;
901
902	buffer_init(&m);
903	buffer_put_string(&m, blob, blen);
904	xfree(blob);
905
906	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
907	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
908
909	buffer_get_bignum2(&m, challenge);
910	buffer_free(&m);
911
912	return (challenge);
913	}
914
915	int
916	mm_auth_rsa_verify_response(Key key, BIGNUM p, u_char response[16])
917	{
918	Buffer m;
919	u_char *blob;
920	u_int blen;
921	int success = 0;
922
923	debug3("%s entering", __func__);
924
925	key->type = KEY_RSA; /* XXX cheat for key_to_blob */
926	if (key_to_blob(key, &blob, &blen) == 0)
927	fatal("%s: key_to_blob failed", __func__);
928	key->type = KEY_RSA1;
929
930	buffer_init(&m);
931	buffer_put_string(&m, blob, blen);
932	buffer_put_string(&m, response, 16);
933	xfree(blob);
934
935	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
936	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
937
938	success = buffer_get_int(&m);
939	buffer_free(&m);
940
941	return (success);
942	}
943
944	#ifdef KRB4
945	int
946	mm_auth_krb4(Authctxt authctxt, void _auth, char *client, void _reply)
947	{
948	KTEXT auth, reply;
949	Buffer m;
950	u_int rlen;
951	int success = 0;
952	char *p;
953
954	debug3("%s entering", __func__);
955	auth = _auth;
956	reply = _reply;
957
958	buffer_init(&m);
959	buffer_put_string(&m, auth->dat, auth->length);
960
961	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m);
962	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m);
963
964	success = buffer_get_int(&m);
965	if (success) {
966	*client = buffer_get_string(&m, NULL);
967	p = buffer_get_string(&m, &rlen);
968	if (rlen >= MAX_KTXT_LEN)
969	fatal("%s: reply from monitor too large", __func__);
970	reply->length = rlen;
971	memcpy(reply->dat, p, rlen);
972	memset(p, 0, rlen);
973	xfree(p);
974	}
975	buffer_free(&m);
976	return (success);
977	}
978	#endif
979
980	#ifdef KRB5
981	int
982	mm_auth_krb5(void ctx, void argp, char *userp, void resp)
983	{
984	krb5_data tkt, reply;
985	Buffer m;
986	int success;
987
988	debug3("%s entering", __func__);
989	tkt = (krb5_data *) argp;
990	reply = (krb5_data *) resp;
991
992	buffer_init(&m);
993	buffer_put_string(&m, tkt->data, tkt->length);
994
995	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m);
996	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m);
997
998	success = buffer_get_int(&m);
999	if (success) {
1000	u_int len;
1001
1002	*userp = buffer_get_string(&m, NULL);
1003	reply->data = buffer_get_string(&m, &len);
1004	reply->length = len;
1005	} else {
1006	memset(reply, 0, sizeof(*reply));
1007	*userp = NULL;
1008	}
1009
1010	buffer_free(&m);
1011	return (success);
1012	}
1013	#endif
1014
1015	#ifdef GSSAPI
1016	OM_uint32
1017	mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid) {
1018	Buffer m;
1019	OM_uint32 major;
1020
1021	/* Client doesn't get to see the context */
1022	*ctx=NULL;
1023
1024	buffer_init(&m);
1025	buffer_put_string(&m,oid->elements,oid->length);
1026
1027	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1028
1029	debug3("%s: waiting for MONITOR_ANS_GSSSETUP",__func__);
1030	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1031	major=buffer_get_int(&m);
1032
1033	return(major);
1034	}
1035
1036	OM_uint32
1037	mm_ssh_gssapi_accept_ctx(Gssctxt ctx, gss_buffer_desc in,
1038	gss_buffer_desc out, OM_uint32 flags) {
1039
1040	Buffer m;
1041	OM_uint32 major;
1042
1043	buffer_init(&m);
1044	buffer_put_string(&m, in->value, in->length);
1045	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1046
1047	debug3("%s: waiting for MONITOR_ANS_GSSSTEP", __func__);
1048	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1049
1050	major=buffer_get_int(&m);
1051	out->value=buffer_get_string(&m,&out->length);
1052	if (flags) *flags=buffer_get_int(&m);
1053
1054	return(major);
1055	}
1056
1057	int
1058	mm_ssh_gssapi_userok(char *user) {
1059	Buffer m;
1060	int authenticated = 0;
1061
1062	buffer_init(&m);
1063	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1064
1065	debug3("%s: waiting for MONTIOR_ANS_GSSUSEROK", __func__);
1066	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1067	&m);
1068
1069	authenticated = buffer_get_int(&m);
1070
1071	buffer_free(&m);
1072	debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1073	return(authenticated);
1074	}
1075
1076	OM_uint32
1077	mm_ssh_gssapi_sign(Gssctxt ctx, gss_buffer_desc data, gss_buffer_desc *hash) {
1078	Buffer m;
1079	OM_uint32 major;
1080
1081	buffer_init(&m);
1082	buffer_put_string(&m, data->value, data->length);
1083
1084	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, &m);
1085
1086	debug3("%s: waiting for MONITOR_ANS_GSSSIGN",__func__);
1087	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, &m);
1088	major=buffer_get_int(&m);
1089	hash->value = buffer_get_string(&m, &hash->length);
1090
1091	return(major);
1092	}
1093	#endif /* GSSAPI */

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