Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.4
1.1 provos 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"
1.4 ! markus 28: RCSID("$OpenBSD: monitor_wrap.c,v 1.3 2002/03/19 10:41:32 markus Exp $");
1.1 provos 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: /* Imports */
55: extern int compat20;
56: extern Newkeys *newkeys[];
57: extern z_stream incoming_stream;
58: extern z_stream outgoing_stream;
59: extern struct monitor *monitor;
60: extern Buffer input, output;
61:
62: void
63: mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
64: {
65: u_char buf[5];
66: u_int mlen = buffer_len(m);
67:
68: debug3("%s entering: type %d", __FUNCTION__, type);
69:
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", __FUNCTION__);
74: if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
75: fatal("%s: write", __FUNCTION__);
76: }
77:
78: void
79: mm_request_receive(int socket, Buffer *m)
80: {
81: u_char buf[4];
82: ssize_t res;
83: u_int msg_len;
84:
85: debug3("%s entering", __FUNCTION__);
86:
87: res = atomicio(read, socket, buf, sizeof(buf));
88: if (res != sizeof(buf)) {
89: if (res == 0)
90: fatal_cleanup();
91: fatal("%s: read: %d", __FUNCTION__, res);
92: }
93: msg_len = GET_32BIT(buf);
94: if (msg_len > 256 * 1024)
95: fatal("%s: read: bad msg_len %d", __FUNCTION__, msg_len);
96: buffer_clear(m);
97: buffer_append_space(m, msg_len);
98: res = atomicio(read, socket, buffer_ptr(m), msg_len);
99: if (res != msg_len)
100: fatal("%s: read: %d != msg_len", __FUNCTION__, res);
101: }
102:
103: void
104: mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
105: {
106: u_char rtype;
107:
108: debug3("%s entering: type %d", __FUNCTION__, type);
109:
110: mm_request_receive(socket, m);
111: rtype = buffer_get_char(m);
112: if (rtype != type)
113: fatal("%s: read: rtype %d != type %d", __FUNCTION__,
114: rtype, type);
115: }
116:
117: DH *
118: mm_choose_dh(int min, int nbits, int max)
119: {
120: BIGNUM *p, *g;
121: int success = 0;
122: Buffer m;
123:
124: buffer_init(&m);
125: buffer_put_int(&m, min);
126: buffer_put_int(&m, nbits);
127: buffer_put_int(&m, max);
128:
129: mm_request_send(monitor->m_recvfd, MONITOR_REQ_MODULI, &m);
130:
131: debug3("%s: waiting for MONITOR_ANS_MODULI", __FUNCTION__);
132: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_MODULI, &m);
133:
134: success = buffer_get_char(&m);
135: if (success == 0)
136: fatal("%s: MONITOR_ANS_MODULI failed", __FUNCTION__);
137:
138: if ((p = BN_new()) == NULL)
139: fatal("%s: BN_new failed", __FUNCTION__);
1.3 markus 140: if ((g = BN_new()) == NULL)
1.1 provos 141: fatal("%s: BN_new failed", __FUNCTION__);
142: buffer_get_bignum2(&m, p);
143: buffer_get_bignum2(&m, g);
144:
145: debug3("%s: remaining %d", __FUNCTION__, buffer_len(&m));
146: buffer_free(&m);
147:
148: return (dh_new_group(g, p));
149: }
150:
151: int
152: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
153: {
154: Kex *kex = *monitor->m_pkex;
155: Buffer m;
156:
157: debug3("%s entering", __FUNCTION__);
158:
159: buffer_init(&m);
160: buffer_put_int(&m, kex->host_key_index(key));
161: buffer_put_string(&m, data, datalen);
162:
163: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SIGN, &m);
164:
165: debug3("%s: waiting for MONITOR_ANS_SIGN", __FUNCTION__);
166: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_SIGN, &m);
167: *sigp = buffer_get_string(&m, lenp);
168: buffer_free(&m);
169:
170: return (0);
171: }
172:
173: struct passwd *
174: mm_getpwnamallow(const char *login)
175: {
176: Buffer m;
177: struct passwd *pw;
178: u_int pwlen;
179:
180: debug3("%s entering", __FUNCTION__);
181:
182: buffer_init(&m);
183: buffer_put_cstring(&m, login);
184:
185: mm_request_send(monitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
186:
187: debug3("%s: waiting for MONITOR_ANS_PWNAM", __FUNCTION__);
188: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
189:
190: if (buffer_get_char(&m) == 0) {
191: buffer_free(&m);
192: return (NULL);
193: }
194: pw = buffer_get_string(&m, &pwlen);
195: if (pwlen != sizeof(struct passwd))
196: fatal("%s: struct passwd size mismatch", __FUNCTION__);
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: pw->pw_class = buffer_get_string(&m, NULL);
201: pw->pw_dir = buffer_get_string(&m, NULL);
202: pw->pw_shell = buffer_get_string(&m, NULL);
203: buffer_free(&m);
204:
205: return (pw);
206: }
207:
208: /* Inform the privileged process about service and style */
209:
210: void
211: mm_inform_authserv(char *service, char *style)
212: {
213: Buffer m;
214:
215: debug3("%s entering", __FUNCTION__);
216:
217: buffer_init(&m);
218: buffer_put_cstring(&m, service);
219: buffer_put_cstring(&m, style ? style : "");
220:
221: mm_request_send(monitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
222:
223: buffer_free(&m);
224: }
225:
226: /* Do the password authentication */
227: int
228: mm_auth_password(Authctxt *authctxt, char *password)
229: {
230: Buffer m;
231: int authenticated = 0;
232:
233: debug3("%s entering", __FUNCTION__);
234:
235: buffer_init(&m);
236: buffer_put_cstring(&m, password);
237: mm_request_send(monitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
238:
239: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __FUNCTION__);
240: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
241:
242: authenticated = buffer_get_int(&m);
243:
244: buffer_free(&m);
245:
1.3 markus 246: debug3("%s: user %sauthenticated",
1.1 provos 247: __FUNCTION__, authenticated ? "" : "not ");
248: return (authenticated);
249: }
250:
251: int
252: mm_user_key_allowed(struct passwd *pw, Key *key)
253: {
254: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
255: }
256:
257: int
258: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
259: Key *key)
260: {
261: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
262: }
263:
264: int
265: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
266: char *host, Key *key)
267: {
268: int ret;
269:
270: key->type = KEY_RSA; /* XXX hack for key_to_blob */
271: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
272: key->type = KEY_RSA1;
273: return (ret);
274: }
275:
1.2 markus 276: static void
1.1 provos 277: mm_send_debug(Buffer *m)
278: {
279: char *msg;
280:
281: while (buffer_len(m)) {
282: msg = buffer_get_string(m, NULL);
283: debug3("%s: Sending debug: %s", __FUNCTION__, msg);
284: packet_send_debug("%s", msg);
285: xfree(msg);
286: }
287: }
288:
289: int
290: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
291: {
292: Buffer m;
293: u_char *blob;
294: u_int len;
295: int allowed = 0;
296:
297: debug3("%s entering", __FUNCTION__);
298:
299: /* Convert the key to a blob and the pass it over */
300: if (!key_to_blob(key, &blob, &len))
301: return (0);
302:
303: buffer_init(&m);
304: buffer_put_int(&m, type);
305: buffer_put_cstring(&m, user ? user : "");
306: buffer_put_cstring(&m, host ? host : "");
307: buffer_put_string(&m, blob, len);
308: xfree(blob);
309:
310: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
311:
312: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __FUNCTION__);
313: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
314:
315: allowed = buffer_get_int(&m);
316:
317: /* Send potential debug messages */
318: mm_send_debug(&m);
319:
320: buffer_free(&m);
321:
322: return (allowed);
323: }
324:
1.3 markus 325: /*
1.1 provos 326: * This key verify needs to send the key type along, because the
327: * privileged parent makes the decision if the key is allowed
328: * for authentication.
329: */
330:
331: int
332: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
333: {
334: Buffer m;
335: u_char *blob;
336: u_int len;
337: int verified = 0;
338:
339: debug3("%s entering", __FUNCTION__);
340:
341: /* Convert the key to a blob and the pass it over */
342: if (!key_to_blob(key, &blob, &len))
343: return (0);
344:
345: buffer_init(&m);
346: buffer_put_string(&m, blob, len);
347: buffer_put_string(&m, sig, siglen);
348: buffer_put_string(&m, data, datalen);
349: xfree(blob);
350:
351: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
352:
353: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __FUNCTION__);
354: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
355:
356: verified = buffer_get_int(&m);
357:
358: buffer_free(&m);
359:
360: return (verified);
361: }
362:
363: /* Export key state after authentication */
364: Newkeys *
365: mm_newkeys_from_blob(u_char *blob, int blen)
366: {
367: Buffer b;
368: u_int len;
369: Newkeys *newkey = NULL;
370: Enc *enc;
371: Mac *mac;
372: Comp *comp;
373:
374: debug3("%s: %p(%d)", __FUNCTION__, blob, blen);
375: #ifdef DEBUG_PK
376: dump_base64(stderr, blob, blen);
377: #endif
378: buffer_init(&b);
379: buffer_append(&b, blob, blen);
380:
381: newkey = xmalloc(sizeof(*newkey));
382: enc = &newkey->enc;
383: mac = &newkey->mac;
384: comp = &newkey->comp;
385:
386: /* Enc structure */
387: enc->name = buffer_get_string(&b, NULL);
388: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
389: enc->enabled = buffer_get_int(&b);
390: enc->block_size = buffer_get_int(&b);
391: enc->key = buffer_get_string(&b, &enc->key_len);
392: enc->iv = buffer_get_string(&b, &len);
393: if (len != enc->block_size)
394: fatal("%s: bad ivlen: expected %d != %d", __FUNCTION__,
395: enc->block_size, len);
396:
397: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
398: fatal("%s: bad cipher name %s or pointer %p", __FUNCTION__,
399: enc->name, enc->cipher);
400:
401: /* Mac structure */
402: mac->name = buffer_get_string(&b, NULL);
403: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
404: fatal("%s: can not init mac %s", __FUNCTION__, mac->name);
405: mac->enabled = buffer_get_int(&b);
406: mac->key = buffer_get_string(&b, &len);
407: if (len > mac->key_len)
408: fatal("%s: bad mac key lenght: %d > %d", __FUNCTION__, len,
409: mac->key_len);
410: mac->key_len = len;
411:
412: /* Comp structure */
413: comp->type = buffer_get_int(&b);
414: comp->enabled = buffer_get_int(&b);
415: comp->name = buffer_get_string(&b, NULL);
416:
417: len = buffer_len(&b);
418: if (len != 0)
419: error("newkeys_from_blob: remaining bytes in blob %d", len);
420: buffer_free(&b);
421: return (newkey);
422: }
423:
424: int
425: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
426: {
427: Buffer b;
428: int len;
429: u_char *buf;
430: Enc *enc;
431: Mac *mac;
432: Comp *comp;
433: Newkeys *newkey = newkeys[mode];
434:
435: debug3("%s: converting %p", __FUNCTION__, newkey);
436:
437: if (newkey == NULL) {
438: error("%s: newkey == NULL", __FUNCTION__);
439: return 0;
440: }
441: enc = &newkey->enc;
442: mac = &newkey->mac;
443: comp = &newkey->comp;
444:
445: buffer_init(&b);
446: /* Enc structure */
447: buffer_put_cstring(&b, enc->name);
448: /* The cipher struct is constant and shared, you export pointer */
449: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
450: buffer_put_int(&b, enc->enabled);
451: buffer_put_int(&b, enc->block_size);
452: buffer_put_string(&b, enc->key, enc->key_len);
453: packet_get_keyiv(mode, enc->iv, enc->block_size);
454: buffer_put_string(&b, enc->iv, enc->block_size);
455:
456: /* Mac structure */
457: buffer_put_cstring(&b, mac->name);
458: buffer_put_int(&b, mac->enabled);
459: buffer_put_string(&b, mac->key, mac->key_len);
460:
461: /* Comp structure */
462: buffer_put_int(&b, comp->type);
463: buffer_put_int(&b, comp->enabled);
464: buffer_put_cstring(&b, comp->name);
465:
466: len = buffer_len(&b);
467: buf = xmalloc(len);
468: memcpy(buf, buffer_ptr(&b), len);
469: memset(buffer_ptr(&b), 0, len);
470: buffer_free(&b);
471: if (lenp != NULL)
472: *lenp = len;
473: if (blobp != NULL)
474: *blobp = buf;
475: return len;
476: }
477:
1.2 markus 478: static void
1.1 provos 479: mm_send_kex(Buffer *m, Kex *kex)
480: {
481: buffer_put_string(m, kex->session_id, kex->session_id_len);
482: buffer_put_int(m, kex->we_need);
483: buffer_put_int(m, kex->hostkey_type);
484: buffer_put_int(m, kex->kex_type);
485: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
486: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
487: buffer_put_int(m, kex->flags);
488: buffer_put_cstring(m, kex->client_version_string);
489: buffer_put_cstring(m, kex->server_version_string);
490: }
491:
492: void
493: mm_send_keystate(struct monitor *monitor)
494: {
495: Buffer m;
496: u_char *blob, *p;
497: u_int bloblen, plen;
498:
499: buffer_init(&m);
500:
501: if (!compat20) {
502: u_char iv[24];
503: int ivlen;
504:
505: buffer_put_int(&m, packet_get_protocol_flags());
506:
507: buffer_put_int(&m, packet_get_ssh1_cipher());
508:
509: debug3("%s: Sending ssh1 IV", __FUNCTION__);
510: ivlen = packet_get_keyiv_len(MODE_OUT);
511: packet_get_keyiv(MODE_OUT, iv, ivlen);
512: buffer_put_string(&m, iv, ivlen);
513: ivlen = packet_get_keyiv_len(MODE_OUT);
514: packet_get_keyiv(MODE_IN, iv, ivlen);
515: buffer_put_string(&m, iv, ivlen);
516: goto skip;
517: } else {
518: /* Kex for rekeying */
1.3 markus 519: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 520: }
521:
522: debug3("%s: Sending new keys: %p %p",
523: __FUNCTION__, newkeys[MODE_OUT], newkeys[MODE_IN]);
524:
525: /* Keys from Kex */
526: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
527: fatal("%s: conversion of newkeys failed", __FUNCTION__);
528:
529: buffer_put_string(&m, blob, bloblen);
530: xfree(blob);
531:
532: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
533: fatal("%s: conversion of newkeys failed", __FUNCTION__);
534:
535: buffer_put_string(&m, blob, bloblen);
536: xfree(blob);
537:
538: buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
539: buffer_put_int(&m, packet_get_seqnr(MODE_IN));
540:
541: debug3("%s: New keys have been sent", __FUNCTION__);
542: skip:
543: /* More key context */
544: plen = packet_get_keycontext(MODE_OUT, NULL);
545: p = xmalloc(plen+1);
546: packet_get_keycontext(MODE_OUT, p);
547: buffer_put_string(&m, p, plen);
548: xfree(p);
549:
550: plen = packet_get_keycontext(MODE_IN, NULL);
551: p = xmalloc(plen+1);
552: packet_get_keycontext(MODE_IN, p);
553: buffer_put_string(&m, p, plen);
554: xfree(p);
555:
556: /* Compression state */
557: debug3("%s: Sending compression state", __FUNCTION__);
558: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
559: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
560:
561: /* Network I/O buffers */
562: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
563: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
564:
565: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
566: debug3("%s: Finished sending state", __FUNCTION__);
567:
568: buffer_free(&m);
569: }
570:
571: int
572: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
573: {
574: Buffer m;
575: u_char *p;
576: int success = 0;
577:
578: buffer_init(&m);
579: mm_request_send(monitor->m_recvfd, MONITOR_REQ_PTY, &m);
580:
581: debug3("%s: waiting for MONITOR_ANS_PTY", __FUNCTION__);
582: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_PTY, &m);
583:
584: success = buffer_get_int(&m);
585: if (success == 0) {
586: debug3("%s: pty alloc failed", __FUNCTION__);
587: buffer_free(&m);
588: return (0);
589: }
590: p = buffer_get_string(&m, NULL);
591: buffer_free(&m);
592:
593: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
594: xfree(p);
595:
596: *ptyfd = mm_receive_fd(monitor->m_recvfd);
597: *ttyfd = mm_receive_fd(monitor->m_recvfd);
598:
599: /* Success */
600: return (1);
601: }
602:
603: void
604: mm_session_pty_cleanup2(void *session)
605: {
606: Session *s = session;
607: Buffer m;
608:
609: if (s->ttyfd == -1)
610: return;
611: buffer_init(&m);
612: buffer_put_cstring(&m, s->tty);
613: mm_request_send(monitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
614: buffer_free(&m);
1.3 markus 615:
1.1 provos 616: /* closed dup'ed master */
617: if (close(s->ptymaster) < 0)
618: error("close(s->ptymaster): %s", strerror(errno));
619:
620: /* unlink pty from session */
621: s->ttyfd = -1;
622: }
623:
624: /* Request process termination */
625:
626: void
627: mm_terminate(void)
628: {
629: Buffer m;
630:
631: buffer_init(&m);
632: mm_request_send(monitor->m_recvfd, MONITOR_REQ_TERM, &m);
633: buffer_free(&m);
634: }
635:
636: int
637: mm_ssh1_session_key(BIGNUM *num)
638: {
639: int rsafail;
640: Buffer m;
641:
642: buffer_init(&m);
643: buffer_put_bignum2(&m, num);
644: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
645:
646: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
647:
648: rsafail = buffer_get_int(&m);
649: buffer_get_bignum2(&m, num);
650:
651: buffer_free(&m);
652:
653: return (rsafail);
654: }
655:
1.2 markus 656: static void
1.1 provos 657: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
658: char ***prompts, u_int **echo_on)
659: {
660: *name = xstrdup("");
661: *infotxt = xstrdup("");
662: *numprompts = 1;
663: *prompts = xmalloc(*numprompts * sizeof(char*));
664: *echo_on = xmalloc(*numprompts * sizeof(u_int));
665: (*echo_on)[0] = 0;
666: }
667:
668: int
669: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
670: u_int *numprompts, char ***prompts, u_int **echo_on)
671: {
672: Buffer m;
673: int res;
674: char *challenge;
675:
676: debug3("%s: entering", __FUNCTION__);
677:
678: buffer_init(&m);
679: mm_request_send(monitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
680:
681: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
682: &m);
683: res = buffer_get_int(&m);
684: if (res == -1) {
685: debug3("%s: no challenge", __FUNCTION__);
686: buffer_free(&m);
687: return (-1);
688: }
689:
690: /* Get the challenge, and format the response */
691: challenge = buffer_get_string(&m, NULL);
692: buffer_free(&m);
693:
694: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
695: (*prompts)[0] = challenge;
696:
697: debug3("%s: received challenge: %s", __FUNCTION__, challenge);
698:
699: return (0);
700: }
701:
702: int
703: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
704: {
705: Buffer m;
706: int authok;
707:
708: debug3("%s: entering", __FUNCTION__);
709: if (numresponses != 1)
710: return (-1);
711:
712: buffer_init(&m);
713: buffer_put_cstring(&m, responses[0]);
714: mm_request_send(monitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
715:
716: mm_request_receive_expect(monitor->m_recvfd,
717: MONITOR_ANS_BSDAUTHRESPOND, &m);
718:
719: authok = buffer_get_int(&m);
720: buffer_free(&m);
721:
722: return ((authok == 0) ? -1 : 0);
723: }
724:
725: int
726: mm_skey_query(void *ctx, char **name, char **infotxt,
727: u_int *numprompts, char ***prompts, u_int **echo_on)
728: {
729: Buffer m;
730: int len, res;
731: char *p, *challenge;
732:
733: debug3("%s: entering", __FUNCTION__);
734:
735: buffer_init(&m);
736: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
737:
738: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
739: &m);
740: res = buffer_get_int(&m);
741: if (res == -1) {
742: debug3("%s: no challenge", __FUNCTION__);
743: buffer_free(&m);
744: return (-1);
745: }
746:
747: /* Get the challenge, and format the response */
748: challenge = buffer_get_string(&m, NULL);
749: buffer_free(&m);
750:
751: debug3("%s: received challenge: %s", __FUNCTION__, challenge);
752:
753: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
754:
755: len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
756: p = xmalloc(len);
757: strlcpy(p, challenge, len);
758: strlcat(p, SKEY_PROMPT, len);
759: (*prompts)[0] = p;
760: xfree(challenge);
761:
762: return (0);
763: }
764:
765: int
766: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
767: {
768: Buffer m;
769: int authok;
770:
771: debug3("%s: entering", __FUNCTION__);
772: if (numresponses != 1)
773: return (-1);
774:
775: buffer_init(&m);
776: buffer_put_cstring(&m, responses[0]);
777: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
778:
779: mm_request_receive_expect(monitor->m_recvfd,
780: MONITOR_ANS_SKEYRESPOND, &m);
781:
782: authok = buffer_get_int(&m);
783: buffer_free(&m);
784:
785: return ((authok == 0) ? -1 : 0);
786: }
787:
788: void
789: mm_ssh1_session_id(u_char session_id[16])
790: {
791: Buffer m;
792: int i;
793:
794: debug3("%s entering", __FUNCTION__);
795:
796: buffer_init(&m);
797: for (i = 0; i < 16; i++)
798: buffer_put_char(&m, session_id[i]);
799:
800: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SESSID, &m);
801: buffer_free(&m);
802: }
803:
804: int
805: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
806: {
807: Buffer m;
808: Key *key;
809: u_char *blob;
810: u_int blen;
811: int allowed = 0;
812:
813: debug3("%s entering", __FUNCTION__);
814:
815: buffer_init(&m);
816: buffer_put_bignum2(&m, client_n);
817:
818: mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
819: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
820:
821: allowed = buffer_get_int(&m);
822:
823: if (allowed && rkey != NULL) {
824: blob = buffer_get_string(&m, &blen);
825: if ((key = key_from_blob(blob, blen)) == NULL)
826: fatal("%s: key_from_blob failed", __FUNCTION__);
827: *rkey = key;
828: xfree(blob);
829: }
830: mm_send_debug(&m);
831: buffer_free(&m);
832:
833: return (allowed);
834: }
835:
836: BIGNUM *
837: mm_auth_rsa_generate_challenge(Key *key)
838: {
839: Buffer m;
840: BIGNUM *challenge;
841: u_char *blob;
842: u_int blen;
843:
844: debug3("%s entering", __FUNCTION__);
845:
846: if ((challenge = BN_new()) == NULL)
847: fatal("%s: BN_new failed", __FUNCTION__);
848:
849: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
850: if (key_to_blob(key, &blob, &blen) == 0)
851: fatal("%s: key_to_blob failed", __FUNCTION__);
852: key->type = KEY_RSA1;
853:
854: buffer_init(&m);
855: buffer_put_string(&m, blob, blen);
856: xfree(blob);
857:
858: mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
859: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
860:
861: buffer_get_bignum2(&m, challenge);
862: buffer_free(&m);
863:
864: return (challenge);
865: }
866:
867: int
868: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
869: {
870: Buffer m;
871: u_char *blob;
872: u_int blen;
873: int success = 0;
874:
875: debug3("%s entering", __FUNCTION__);
876:
877: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
878: if (key_to_blob(key, &blob, &blen) == 0)
879: fatal("%s: key_to_blob failed", __FUNCTION__);
880: key->type = KEY_RSA1;
881:
882: buffer_init(&m);
883: buffer_put_string(&m, blob, blen);
884: buffer_put_string(&m, response, 16);
885: xfree(blob);
886:
887: mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
888: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
889:
890: success = buffer_get_int(&m);
891: buffer_free(&m);
892:
893: return (success);
894: }
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