2 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
3 * Copyright 2002 Markus Friedl <markus@openbsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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.
28 RCSID("$OpenBSD: monitor_wrap.c,v 1.15 2002/07/04 04:15:33 deraadt Exp $");
30 #include <openssl/bn.h>
31 #include <openssl/dh.h>
44 #include "monitor_wrap.h"
47 #include "monitor_fdpass.h"
56 extern Newkeys *newkeys[];
57 extern z_stream incoming_stream;
58 extern z_stream outgoing_stream;
59 extern struct monitor *pmonitor;
60 extern Buffer input, output;
63 mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
65 u_int mlen = buffer_len(m);
68 debug3("%s entering: type %d", __func__, type);
70 PUT_32BIT(buf, mlen + 1);
71 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
72 if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf))
73 fatal("%s: write", __func__);
74 if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
75 fatal("%s: write", __func__);
79 mm_request_receive(int socket, Buffer *m)
85 debug3("%s entering", __func__);
87 res = atomicio(read, socket, buf, sizeof(buf));
88 if (res != sizeof(buf)) {
91 fatal("%s: read: %ld", __func__, (long)res);
93 msg_len = GET_32BIT(buf);
94 if (msg_len > 256 * 1024)
95 fatal("%s: read: bad msg_len %d", __func__, msg_len);
97 buffer_append_space(m, msg_len);
98 res = atomicio(read, socket, buffer_ptr(m), msg_len);
100 fatal("%s: read: %ld != msg_len", __func__, (long)res);
104 mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
108 debug3("%s entering: type %d", __func__, type);
110 mm_request_receive(socket, m);
111 rtype = buffer_get_char(m);
113 fatal("%s: read: rtype %d != type %d", __func__,
118 mm_choose_dh(int min, int nbits, int max)
125 buffer_put_int(&m, min);
126 buffer_put_int(&m, nbits);
127 buffer_put_int(&m, max);
129 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
131 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
132 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
134 success = buffer_get_char(&m);
136 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
138 if ((p = BN_new()) == NULL)
139 fatal("%s: BN_new failed", __func__);
140 if ((g = BN_new()) == NULL)
141 fatal("%s: BN_new failed", __func__);
142 buffer_get_bignum2(&m, p);
143 buffer_get_bignum2(&m, g);
145 debug3("%s: remaining %d", __func__, buffer_len(&m));
148 return (dh_new_group(g, p));
152 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
154 Kex *kex = *pmonitor->m_pkex;
157 debug3("%s entering", __func__);
160 buffer_put_int(&m, kex->host_key_index(key));
161 buffer_put_string(&m, data, datalen);
163 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
165 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
166 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
167 *sigp = buffer_get_string(&m, lenp);
174 mm_getpwnamallow(const char *login)
180 debug3("%s entering", __func__);
183 buffer_put_cstring(&m, login);
185 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
187 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
188 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
190 if (buffer_get_char(&m) == 0) {
194 pw = buffer_get_string(&m, &pwlen);
195 if (pwlen != sizeof(struct passwd))
196 fatal("%s: struct passwd size mismatch", __func__);
197 pw->pw_name = buffer_get_string(&m, NULL);
198 pw->pw_passwd = buffer_get_string(&m, NULL);
199 pw->pw_gecos = buffer_get_string(&m, NULL);
200 #ifdef HAVE_PW_CLASS_IN_PASSWD
201 pw->pw_class = buffer_get_string(&m, NULL);
203 pw->pw_dir = buffer_get_string(&m, NULL);
204 pw->pw_shell = buffer_get_string(&m, NULL);
210 char *mm_auth2_read_banner(void)
215 debug3("%s entering", __func__);
218 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
221 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m);
222 banner = buffer_get_string(&m, NULL);
228 /* Inform the privileged process about service and style */
231 mm_inform_authserv(char *service, char *style)
235 debug3("%s entering", __func__);
238 buffer_put_cstring(&m, service);
239 buffer_put_cstring(&m, style ? style : "");
241 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
246 /* Do the password authentication */
248 mm_auth_password(Authctxt *authctxt, char *password)
251 int authenticated = 0;
253 debug3("%s entering", __func__);
256 buffer_put_cstring(&m, password);
257 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
259 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
260 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
262 authenticated = buffer_get_int(&m);
266 debug3("%s: user %sauthenticated",
267 __func__, authenticated ? "" : "not ");
268 return (authenticated);
272 mm_user_key_allowed(struct passwd *pw, Key *key)
274 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
278 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
281 return (mm_key_allowed(MM_HOSTKEY, user, host, key));
285 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
286 char *host, Key *key)
290 key->type = KEY_RSA; /* XXX hack for key_to_blob */
291 ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
292 key->type = KEY_RSA1;
297 mm_send_debug(Buffer *m)
301 while (buffer_len(m)) {
302 msg = buffer_get_string(m, NULL);
303 debug3("%s: Sending debug: %s", __func__, msg);
304 packet_send_debug("%s", msg);
310 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
317 debug3("%s entering", __func__);
319 /* Convert the key to a blob and the pass it over */
320 if (!key_to_blob(key, &blob, &len))
324 buffer_put_int(&m, type);
325 buffer_put_cstring(&m, user ? user : "");
326 buffer_put_cstring(&m, host ? host : "");
327 buffer_put_string(&m, blob, len);
330 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
332 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
333 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
335 allowed = buffer_get_int(&m);
337 /* Send potential debug messages */
346 * This key verify needs to send the key type along, because the
347 * privileged parent makes the decision if the key is allowed
348 * for authentication.
352 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
359 debug3("%s entering", __func__);
361 /* Convert the key to a blob and the pass it over */
362 if (!key_to_blob(key, &blob, &len))
366 buffer_put_string(&m, blob, len);
367 buffer_put_string(&m, sig, siglen);
368 buffer_put_string(&m, data, datalen);
371 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
373 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
374 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
376 verified = buffer_get_int(&m);
383 /* Export key state after authentication */
385 mm_newkeys_from_blob(u_char *blob, int blen)
389 Newkeys *newkey = NULL;
394 debug3("%s: %p(%d)", __func__, blob, blen);
396 dump_base64(stderr, blob, blen);
399 buffer_append(&b, blob, blen);
401 newkey = xmalloc(sizeof(*newkey));
404 comp = &newkey->comp;
407 enc->name = buffer_get_string(&b, NULL);
408 buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
409 enc->enabled = buffer_get_int(&b);
410 enc->block_size = buffer_get_int(&b);
411 enc->key = buffer_get_string(&b, &enc->key_len);
412 enc->iv = buffer_get_string(&b, &len);
413 if (len != enc->block_size)
414 fatal("%s: bad ivlen: expected %u != %u", __func__,
415 enc->block_size, len);
417 if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
418 fatal("%s: bad cipher name %s or pointer %p", __func__,
419 enc->name, enc->cipher);
422 mac->name = buffer_get_string(&b, NULL);
423 if (mac->name == NULL || mac_init(mac, mac->name) == -1)
424 fatal("%s: can not init mac %s", __func__, mac->name);
425 mac->enabled = buffer_get_int(&b);
426 mac->key = buffer_get_string(&b, &len);
427 if (len > mac->key_len)
428 fatal("%s: bad mac key length: %u > %d", __func__, len,
433 comp->type = buffer_get_int(&b);
434 comp->enabled = buffer_get_int(&b);
435 comp->name = buffer_get_string(&b, NULL);
437 len = buffer_len(&b);
439 error("newkeys_from_blob: remaining bytes in blob %u", len);
445 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
453 Newkeys *newkey = newkeys[mode];
455 debug3("%s: converting %p", __func__, newkey);
457 if (newkey == NULL) {
458 error("%s: newkey == NULL", __func__);
463 comp = &newkey->comp;
467 buffer_put_cstring(&b, enc->name);
468 /* The cipher struct is constant and shared, you export pointer */
469 buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
470 buffer_put_int(&b, enc->enabled);
471 buffer_put_int(&b, enc->block_size);
472 buffer_put_string(&b, enc->key, enc->key_len);
473 packet_get_keyiv(mode, enc->iv, enc->block_size);
474 buffer_put_string(&b, enc->iv, enc->block_size);
477 buffer_put_cstring(&b, mac->name);
478 buffer_put_int(&b, mac->enabled);
479 buffer_put_string(&b, mac->key, mac->key_len);
482 buffer_put_int(&b, comp->type);
483 buffer_put_int(&b, comp->enabled);
484 buffer_put_cstring(&b, comp->name);
486 len = buffer_len(&b);
488 memcpy(buf, buffer_ptr(&b), len);
489 memset(buffer_ptr(&b), 0, len);
501 mm_send_kex(Buffer *m, Kex *kex)
503 buffer_put_string(m, kex->session_id, kex->session_id_len);
504 buffer_put_int(m, kex->we_need);
505 buffer_put_int(m, kex->hostkey_type);
506 buffer_put_int(m, kex->kex_type);
507 buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
508 buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
509 buffer_put_int(m, kex->flags);
510 buffer_put_cstring(m, kex->client_version_string);
511 buffer_put_cstring(m, kex->server_version_string);
515 mm_send_keystate(struct monitor *pmonitor)
528 buffer_put_int(&m, packet_get_protocol_flags());
530 buffer_put_int(&m, packet_get_ssh1_cipher());
532 debug3("%s: Sending ssh1 KEY+IV", __func__);
533 keylen = packet_get_encryption_key(NULL);
534 key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
535 keylen = packet_get_encryption_key(key);
536 buffer_put_string(&m, key, keylen);
537 memset(key, 0, keylen);
540 ivlen = packet_get_keyiv_len(MODE_OUT);
541 packet_get_keyiv(MODE_OUT, iv, ivlen);
542 buffer_put_string(&m, iv, ivlen);
543 ivlen = packet_get_keyiv_len(MODE_OUT);
544 packet_get_keyiv(MODE_IN, iv, ivlen);
545 buffer_put_string(&m, iv, ivlen);
548 /* Kex for rekeying */
549 mm_send_kex(&m, *pmonitor->m_pkex);
552 debug3("%s: Sending new keys: %p %p",
553 __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
556 if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
557 fatal("%s: conversion of newkeys failed", __func__);
559 buffer_put_string(&m, blob, bloblen);
562 if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
563 fatal("%s: conversion of newkeys failed", __func__);
565 buffer_put_string(&m, blob, bloblen);
568 buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
569 buffer_put_int(&m, packet_get_seqnr(MODE_IN));
571 debug3("%s: New keys have been sent", __func__);
573 /* More key context */
574 plen = packet_get_keycontext(MODE_OUT, NULL);
576 packet_get_keycontext(MODE_OUT, p);
577 buffer_put_string(&m, p, plen);
580 plen = packet_get_keycontext(MODE_IN, NULL);
582 packet_get_keycontext(MODE_IN, p);
583 buffer_put_string(&m, p, plen);
586 /* Compression state */
587 debug3("%s: Sending compression state", __func__);
588 buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
589 buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
591 /* Network I/O buffers */
592 buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
593 buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
595 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
596 debug3("%s: Finished sending state", __func__);
602 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
609 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
611 debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
612 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
614 success = buffer_get_int(&m);
616 debug3("%s: pty alloc failed", __func__);
620 p = buffer_get_string(&m, NULL);
623 strlcpy(namebuf, p, namebuflen); /* Possible truncation */
626 *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
627 *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
634 mm_session_pty_cleanup2(void *session)
636 Session *s = session;
642 buffer_put_cstring(&m, s->tty);
643 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
646 /* closed dup'ed master */
647 if (close(s->ptymaster) < 0)
648 error("close(s->ptymaster): %s", strerror(errno));
650 /* unlink pty from session */
656 mm_start_pam(char *user)
660 debug3("%s entering", __func__);
663 buffer_put_cstring(&m, user);
665 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
671 /* Request process termination */
679 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
684 mm_ssh1_session_key(BIGNUM *num)
690 buffer_put_bignum2(&m, num);
691 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
693 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
695 rsafail = buffer_get_int(&m);
696 buffer_get_bignum2(&m, num);
704 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
705 char ***prompts, u_int **echo_on)
708 *infotxt = xstrdup("");
710 *prompts = xmalloc(*numprompts * sizeof(char *));
711 *echo_on = xmalloc(*numprompts * sizeof(u_int));
716 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
717 u_int *numprompts, char ***prompts, u_int **echo_on)
723 debug3("%s: entering", __func__);
726 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
728 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
730 res = buffer_get_int(&m);
732 debug3("%s: no challenge", __func__);
737 /* Get the challenge, and format the response */
738 challenge = buffer_get_string(&m, NULL);
741 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
742 (*prompts)[0] = challenge;
744 debug3("%s: received challenge: %s", __func__, challenge);
750 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
755 debug3("%s: entering", __func__);
756 if (numresponses != 1)
760 buffer_put_cstring(&m, responses[0]);
761 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
763 mm_request_receive_expect(pmonitor->m_recvfd,
764 MONITOR_ANS_BSDAUTHRESPOND, &m);
766 authok = buffer_get_int(&m);
769 return ((authok == 0) ? -1 : 0);
773 mm_skey_query(void *ctx, char **name, char **infotxt,
774 u_int *numprompts, char ***prompts, u_int **echo_on)
780 debug3("%s: entering", __func__);
783 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
785 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
787 res = buffer_get_int(&m);
789 debug3("%s: no challenge", __func__);
794 /* Get the challenge, and format the response */
795 challenge = buffer_get_string(&m, NULL);
798 debug3("%s: received challenge: %s", __func__, challenge);
800 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
802 len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
804 strlcpy(p, challenge, len);
805 strlcat(p, SKEY_PROMPT, len);
813 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
818 debug3("%s: entering", __func__);
819 if (numresponses != 1)
823 buffer_put_cstring(&m, responses[0]);
824 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
826 mm_request_receive_expect(pmonitor->m_recvfd,
827 MONITOR_ANS_SKEYRESPOND, &m);
829 authok = buffer_get_int(&m);
832 return ((authok == 0) ? -1 : 0);
836 mm_ssh1_session_id(u_char session_id[16])
841 debug3("%s entering", __func__);
844 for (i = 0; i < 16; i++)
845 buffer_put_char(&m, session_id[i]);
847 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
852 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
860 debug3("%s entering", __func__);
863 buffer_put_bignum2(&m, client_n);
865 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
866 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
868 allowed = buffer_get_int(&m);
870 if (allowed && rkey != NULL) {
871 blob = buffer_get_string(&m, &blen);
872 if ((key = key_from_blob(blob, blen)) == NULL)
873 fatal("%s: key_from_blob failed", __func__);
884 mm_auth_rsa_generate_challenge(Key *key)
891 debug3("%s entering", __func__);
893 if ((challenge = BN_new()) == NULL)
894 fatal("%s: BN_new failed", __func__);
896 key->type = KEY_RSA; /* XXX cheat for key_to_blob */
897 if (key_to_blob(key, &blob, &blen) == 0)
898 fatal("%s: key_to_blob failed", __func__);
899 key->type = KEY_RSA1;
902 buffer_put_string(&m, blob, blen);
905 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
906 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
908 buffer_get_bignum2(&m, challenge);
915 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
922 debug3("%s entering", __func__);
924 key->type = KEY_RSA; /* XXX cheat for key_to_blob */
925 if (key_to_blob(key, &blob, &blen) == 0)
926 fatal("%s: key_to_blob failed", __func__);
927 key->type = KEY_RSA1;
930 buffer_put_string(&m, blob, blen);
931 buffer_put_string(&m, response, 16);
934 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
935 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
937 success = buffer_get_int(&m);