Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.3
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"
1.3 ! markus 28: RCSID("$OpenBSD: monitor_wrap.c,v 1.2 2002/03/19 10:35:39 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: void
209: pwfree(struct passwd *pw)
210: {
211: xfree(pw->pw_name);
212: xfree(pw->pw_passwd);
213: xfree(pw->pw_gecos);
214: xfree(pw->pw_class);
215: xfree(pw->pw_dir);
216: xfree(pw->pw_shell);
217: xfree(pw);
218: }
219:
220: /* Inform the privileged process about service and style */
221:
222: void
223: mm_inform_authserv(char *service, char *style)
224: {
225: Buffer m;
226:
227: debug3("%s entering", __FUNCTION__);
228:
229: buffer_init(&m);
230: buffer_put_cstring(&m, service);
231: buffer_put_cstring(&m, style ? style : "");
232:
233: mm_request_send(monitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
234:
235: buffer_free(&m);
236: }
237:
238: /* Do the password authentication */
239: int
240: mm_auth_password(Authctxt *authctxt, char *password)
241: {
242: Buffer m;
243: int authenticated = 0;
244:
245: debug3("%s entering", __FUNCTION__);
246:
247: buffer_init(&m);
248: buffer_put_cstring(&m, password);
249: mm_request_send(monitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
250:
251: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __FUNCTION__);
252: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
253:
254: authenticated = buffer_get_int(&m);
255:
256: buffer_free(&m);
257:
1.3 ! markus 258: debug3("%s: user %sauthenticated",
1.1 provos 259: __FUNCTION__, authenticated ? "" : "not ");
260: return (authenticated);
261: }
262:
263: int
264: mm_user_key_allowed(struct passwd *pw, Key *key)
265: {
266: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
267: }
268:
269: int
270: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
271: Key *key)
272: {
273: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
274: }
275:
276: int
277: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
278: char *host, Key *key)
279: {
280: int ret;
281:
282: key->type = KEY_RSA; /* XXX hack for key_to_blob */
283: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
284: key->type = KEY_RSA1;
285: return (ret);
286: }
287:
1.2 markus 288: static void
1.1 provos 289: mm_send_debug(Buffer *m)
290: {
291: char *msg;
292:
293: while (buffer_len(m)) {
294: msg = buffer_get_string(m, NULL);
295: debug3("%s: Sending debug: %s", __FUNCTION__, msg);
296: packet_send_debug("%s", msg);
297: xfree(msg);
298: }
299: }
300:
301: int
302: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
303: {
304: Buffer m;
305: u_char *blob;
306: u_int len;
307: int allowed = 0;
308:
309: debug3("%s entering", __FUNCTION__);
310:
311: /* Convert the key to a blob and the pass it over */
312: if (!key_to_blob(key, &blob, &len))
313: return (0);
314:
315: buffer_init(&m);
316: buffer_put_int(&m, type);
317: buffer_put_cstring(&m, user ? user : "");
318: buffer_put_cstring(&m, host ? host : "");
319: buffer_put_string(&m, blob, len);
320: xfree(blob);
321:
322: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
323:
324: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __FUNCTION__);
325: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
326:
327: allowed = buffer_get_int(&m);
328:
329: /* Send potential debug messages */
330: mm_send_debug(&m);
331:
332: buffer_free(&m);
333:
334: return (allowed);
335: }
336:
1.3 ! markus 337: /*
1.1 provos 338: * This key verify needs to send the key type along, because the
339: * privileged parent makes the decision if the key is allowed
340: * for authentication.
341: */
342:
343: int
344: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
345: {
346: Buffer m;
347: u_char *blob;
348: u_int len;
349: int verified = 0;
350:
351: debug3("%s entering", __FUNCTION__);
352:
353: /* Convert the key to a blob and the pass it over */
354: if (!key_to_blob(key, &blob, &len))
355: return (0);
356:
357: buffer_init(&m);
358: buffer_put_string(&m, blob, len);
359: buffer_put_string(&m, sig, siglen);
360: buffer_put_string(&m, data, datalen);
361: xfree(blob);
362:
363: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
364:
365: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __FUNCTION__);
366: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
367:
368: verified = buffer_get_int(&m);
369:
370: buffer_free(&m);
371:
372: return (verified);
373: }
374:
375: /* Export key state after authentication */
376: Newkeys *
377: mm_newkeys_from_blob(u_char *blob, int blen)
378: {
379: Buffer b;
380: u_int len;
381: Newkeys *newkey = NULL;
382: Enc *enc;
383: Mac *mac;
384: Comp *comp;
385:
386: debug3("%s: %p(%d)", __FUNCTION__, blob, blen);
387: #ifdef DEBUG_PK
388: dump_base64(stderr, blob, blen);
389: #endif
390: buffer_init(&b);
391: buffer_append(&b, blob, blen);
392:
393: newkey = xmalloc(sizeof(*newkey));
394: enc = &newkey->enc;
395: mac = &newkey->mac;
396: comp = &newkey->comp;
397:
398: /* Enc structure */
399: enc->name = buffer_get_string(&b, NULL);
400: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
401: enc->enabled = buffer_get_int(&b);
402: enc->block_size = buffer_get_int(&b);
403: enc->key = buffer_get_string(&b, &enc->key_len);
404: enc->iv = buffer_get_string(&b, &len);
405: if (len != enc->block_size)
406: fatal("%s: bad ivlen: expected %d != %d", __FUNCTION__,
407: enc->block_size, len);
408:
409: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
410: fatal("%s: bad cipher name %s or pointer %p", __FUNCTION__,
411: enc->name, enc->cipher);
412:
413: /* Mac structure */
414: mac->name = buffer_get_string(&b, NULL);
415: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
416: fatal("%s: can not init mac %s", __FUNCTION__, mac->name);
417: mac->enabled = buffer_get_int(&b);
418: mac->key = buffer_get_string(&b, &len);
419: if (len > mac->key_len)
420: fatal("%s: bad mac key lenght: %d > %d", __FUNCTION__, len,
421: mac->key_len);
422: mac->key_len = len;
423:
424: /* Comp structure */
425: comp->type = buffer_get_int(&b);
426: comp->enabled = buffer_get_int(&b);
427: comp->name = buffer_get_string(&b, NULL);
428:
429: len = buffer_len(&b);
430: if (len != 0)
431: error("newkeys_from_blob: remaining bytes in blob %d", len);
432: buffer_free(&b);
433: return (newkey);
434: }
435:
436: int
437: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
438: {
439: Buffer b;
440: int len;
441: u_char *buf;
442: Enc *enc;
443: Mac *mac;
444: Comp *comp;
445: Newkeys *newkey = newkeys[mode];
446:
447: debug3("%s: converting %p", __FUNCTION__, newkey);
448:
449: if (newkey == NULL) {
450: error("%s: newkey == NULL", __FUNCTION__);
451: return 0;
452: }
453: enc = &newkey->enc;
454: mac = &newkey->mac;
455: comp = &newkey->comp;
456:
457: buffer_init(&b);
458: /* Enc structure */
459: buffer_put_cstring(&b, enc->name);
460: /* The cipher struct is constant and shared, you export pointer */
461: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
462: buffer_put_int(&b, enc->enabled);
463: buffer_put_int(&b, enc->block_size);
464: buffer_put_string(&b, enc->key, enc->key_len);
465: packet_get_keyiv(mode, enc->iv, enc->block_size);
466: buffer_put_string(&b, enc->iv, enc->block_size);
467:
468: /* Mac structure */
469: buffer_put_cstring(&b, mac->name);
470: buffer_put_int(&b, mac->enabled);
471: buffer_put_string(&b, mac->key, mac->key_len);
472:
473: /* Comp structure */
474: buffer_put_int(&b, comp->type);
475: buffer_put_int(&b, comp->enabled);
476: buffer_put_cstring(&b, comp->name);
477:
478: len = buffer_len(&b);
479: buf = xmalloc(len);
480: memcpy(buf, buffer_ptr(&b), len);
481: memset(buffer_ptr(&b), 0, len);
482: buffer_free(&b);
483: if (lenp != NULL)
484: *lenp = len;
485: if (blobp != NULL)
486: *blobp = buf;
487: return len;
488: }
489:
1.2 markus 490: static void
1.1 provos 491: mm_send_kex(Buffer *m, Kex *kex)
492: {
493: buffer_put_string(m, kex->session_id, kex->session_id_len);
494: buffer_put_int(m, kex->we_need);
495: buffer_put_int(m, kex->hostkey_type);
496: buffer_put_int(m, kex->kex_type);
497: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
498: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
499: buffer_put_int(m, kex->flags);
500: buffer_put_cstring(m, kex->client_version_string);
501: buffer_put_cstring(m, kex->server_version_string);
502: }
503:
504: void
505: mm_send_keystate(struct monitor *monitor)
506: {
507: Buffer m;
508: u_char *blob, *p;
509: u_int bloblen, plen;
510:
511: buffer_init(&m);
512:
513: if (!compat20) {
514: u_char iv[24];
515: int ivlen;
516:
517: buffer_put_int(&m, packet_get_protocol_flags());
518:
519: buffer_put_int(&m, packet_get_ssh1_cipher());
520:
521: debug3("%s: Sending ssh1 IV", __FUNCTION__);
522: ivlen = packet_get_keyiv_len(MODE_OUT);
523: packet_get_keyiv(MODE_OUT, iv, ivlen);
524: buffer_put_string(&m, iv, ivlen);
525: ivlen = packet_get_keyiv_len(MODE_OUT);
526: packet_get_keyiv(MODE_IN, iv, ivlen);
527: buffer_put_string(&m, iv, ivlen);
528: goto skip;
529: } else {
530: /* Kex for rekeying */
1.3 ! markus 531: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 532: }
533:
534: debug3("%s: Sending new keys: %p %p",
535: __FUNCTION__, newkeys[MODE_OUT], newkeys[MODE_IN]);
536:
537: /* Keys from Kex */
538: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
539: fatal("%s: conversion of newkeys failed", __FUNCTION__);
540:
541: buffer_put_string(&m, blob, bloblen);
542: xfree(blob);
543:
544: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
545: fatal("%s: conversion of newkeys failed", __FUNCTION__);
546:
547: buffer_put_string(&m, blob, bloblen);
548: xfree(blob);
549:
550: buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
551: buffer_put_int(&m, packet_get_seqnr(MODE_IN));
552:
553: debug3("%s: New keys have been sent", __FUNCTION__);
554: skip:
555: /* More key context */
556: plen = packet_get_keycontext(MODE_OUT, NULL);
557: p = xmalloc(plen+1);
558: packet_get_keycontext(MODE_OUT, p);
559: buffer_put_string(&m, p, plen);
560: xfree(p);
561:
562: plen = packet_get_keycontext(MODE_IN, NULL);
563: p = xmalloc(plen+1);
564: packet_get_keycontext(MODE_IN, p);
565: buffer_put_string(&m, p, plen);
566: xfree(p);
567:
568: /* Compression state */
569: debug3("%s: Sending compression state", __FUNCTION__);
570: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
571: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
572:
573: /* Network I/O buffers */
574: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
575: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
576:
577: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
578: debug3("%s: Finished sending state", __FUNCTION__);
579:
580: buffer_free(&m);
581: }
582:
583: int
584: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
585: {
586: Buffer m;
587: u_char *p;
588: int success = 0;
589:
590: buffer_init(&m);
591: mm_request_send(monitor->m_recvfd, MONITOR_REQ_PTY, &m);
592:
593: debug3("%s: waiting for MONITOR_ANS_PTY", __FUNCTION__);
594: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_PTY, &m);
595:
596: success = buffer_get_int(&m);
597: if (success == 0) {
598: debug3("%s: pty alloc failed", __FUNCTION__);
599: buffer_free(&m);
600: return (0);
601: }
602: p = buffer_get_string(&m, NULL);
603: buffer_free(&m);
604:
605: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
606: xfree(p);
607:
608: *ptyfd = mm_receive_fd(monitor->m_recvfd);
609: *ttyfd = mm_receive_fd(monitor->m_recvfd);
610:
611: /* Success */
612: return (1);
613: }
614:
615: void
616: mm_session_pty_cleanup2(void *session)
617: {
618: Session *s = session;
619: Buffer m;
620:
621: if (s->ttyfd == -1)
622: return;
623: buffer_init(&m);
624: buffer_put_cstring(&m, s->tty);
625: mm_request_send(monitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
626: buffer_free(&m);
1.3 ! markus 627:
1.1 provos 628: /* closed dup'ed master */
629: if (close(s->ptymaster) < 0)
630: error("close(s->ptymaster): %s", strerror(errno));
631:
632: /* unlink pty from session */
633: s->ttyfd = -1;
634: }
635:
636: /* Request process termination */
637:
638: void
639: mm_terminate(void)
640: {
641: Buffer m;
642:
643: buffer_init(&m);
644: mm_request_send(monitor->m_recvfd, MONITOR_REQ_TERM, &m);
645: buffer_free(&m);
646: }
647:
648: int
649: mm_ssh1_session_key(BIGNUM *num)
650: {
651: int rsafail;
652: Buffer m;
653:
654: buffer_init(&m);
655: buffer_put_bignum2(&m, num);
656: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
657:
658: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
659:
660: rsafail = buffer_get_int(&m);
661: buffer_get_bignum2(&m, num);
662:
663: buffer_free(&m);
664:
665: return (rsafail);
666: }
667:
1.2 markus 668: static void
1.1 provos 669: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
670: char ***prompts, u_int **echo_on)
671: {
672: *name = xstrdup("");
673: *infotxt = xstrdup("");
674: *numprompts = 1;
675: *prompts = xmalloc(*numprompts * sizeof(char*));
676: *echo_on = xmalloc(*numprompts * sizeof(u_int));
677: (*echo_on)[0] = 0;
678: }
679:
680: int
681: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
682: u_int *numprompts, char ***prompts, u_int **echo_on)
683: {
684: Buffer m;
685: int res;
686: char *challenge;
687:
688: debug3("%s: entering", __FUNCTION__);
689:
690: buffer_init(&m);
691: mm_request_send(monitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
692:
693: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
694: &m);
695: res = buffer_get_int(&m);
696: if (res == -1) {
697: debug3("%s: no challenge", __FUNCTION__);
698: buffer_free(&m);
699: return (-1);
700: }
701:
702: /* Get the challenge, and format the response */
703: challenge = buffer_get_string(&m, NULL);
704: buffer_free(&m);
705:
706: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
707: (*prompts)[0] = challenge;
708:
709: debug3("%s: received challenge: %s", __FUNCTION__, challenge);
710:
711: return (0);
712: }
713:
714: int
715: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
716: {
717: Buffer m;
718: int authok;
719:
720: debug3("%s: entering", __FUNCTION__);
721: if (numresponses != 1)
722: return (-1);
723:
724: buffer_init(&m);
725: buffer_put_cstring(&m, responses[0]);
726: mm_request_send(monitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
727:
728: mm_request_receive_expect(monitor->m_recvfd,
729: MONITOR_ANS_BSDAUTHRESPOND, &m);
730:
731: authok = buffer_get_int(&m);
732: buffer_free(&m);
733:
734: return ((authok == 0) ? -1 : 0);
735: }
736:
737: int
738: mm_skey_query(void *ctx, char **name, char **infotxt,
739: u_int *numprompts, char ***prompts, u_int **echo_on)
740: {
741: Buffer m;
742: int len, res;
743: char *p, *challenge;
744:
745: debug3("%s: entering", __FUNCTION__);
746:
747: buffer_init(&m);
748: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
749:
750: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
751: &m);
752: res = buffer_get_int(&m);
753: if (res == -1) {
754: debug3("%s: no challenge", __FUNCTION__);
755: buffer_free(&m);
756: return (-1);
757: }
758:
759: /* Get the challenge, and format the response */
760: challenge = buffer_get_string(&m, NULL);
761: buffer_free(&m);
762:
763: debug3("%s: received challenge: %s", __FUNCTION__, challenge);
764:
765: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
766:
767: len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
768: p = xmalloc(len);
769: strlcpy(p, challenge, len);
770: strlcat(p, SKEY_PROMPT, len);
771: (*prompts)[0] = p;
772: xfree(challenge);
773:
774: return (0);
775: }
776:
777: int
778: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
779: {
780: Buffer m;
781: int authok;
782:
783: debug3("%s: entering", __FUNCTION__);
784: if (numresponses != 1)
785: return (-1);
786:
787: buffer_init(&m);
788: buffer_put_cstring(&m, responses[0]);
789: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
790:
791: mm_request_receive_expect(monitor->m_recvfd,
792: MONITOR_ANS_SKEYRESPOND, &m);
793:
794: authok = buffer_get_int(&m);
795: buffer_free(&m);
796:
797: return ((authok == 0) ? -1 : 0);
798: }
799:
800: void
801: mm_ssh1_session_id(u_char session_id[16])
802: {
803: Buffer m;
804: int i;
805:
806: debug3("%s entering", __FUNCTION__);
807:
808: buffer_init(&m);
809: for (i = 0; i < 16; i++)
810: buffer_put_char(&m, session_id[i]);
811:
812: mm_request_send(monitor->m_recvfd, MONITOR_REQ_SESSID, &m);
813: buffer_free(&m);
814: }
815:
816: int
817: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
818: {
819: Buffer m;
820: Key *key;
821: u_char *blob;
822: u_int blen;
823: int allowed = 0;
824:
825: debug3("%s entering", __FUNCTION__);
826:
827: buffer_init(&m);
828: buffer_put_bignum2(&m, client_n);
829:
830: mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
831: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
832:
833: allowed = buffer_get_int(&m);
834:
835: if (allowed && rkey != NULL) {
836: blob = buffer_get_string(&m, &blen);
837: if ((key = key_from_blob(blob, blen)) == NULL)
838: fatal("%s: key_from_blob failed", __FUNCTION__);
839: *rkey = key;
840: xfree(blob);
841: }
842: mm_send_debug(&m);
843: buffer_free(&m);
844:
845: return (allowed);
846: }
847:
848: BIGNUM *
849: mm_auth_rsa_generate_challenge(Key *key)
850: {
851: Buffer m;
852: BIGNUM *challenge;
853: u_char *blob;
854: u_int blen;
855:
856: debug3("%s entering", __FUNCTION__);
857:
858: if ((challenge = BN_new()) == NULL)
859: fatal("%s: BN_new failed", __FUNCTION__);
860:
861: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
862: if (key_to_blob(key, &blob, &blen) == 0)
863: fatal("%s: key_to_blob failed", __FUNCTION__);
864: key->type = KEY_RSA1;
865:
866: buffer_init(&m);
867: buffer_put_string(&m, blob, blen);
868: xfree(blob);
869:
870: mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
871: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
872:
873: buffer_get_bignum2(&m, challenge);
874: buffer_free(&m);
875:
876: return (challenge);
877: }
878:
879: int
880: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
881: {
882: Buffer m;
883: u_char *blob;
884: u_int blen;
885: int success = 0;
886:
887: debug3("%s entering", __FUNCTION__);
888:
889: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
890: if (key_to_blob(key, &blob, &blen) == 0)
891: fatal("%s: key_to_blob failed", __FUNCTION__);
892: key->type = KEY_RSA1;
893:
894: buffer_init(&m);
895: buffer_put_string(&m, blob, blen);
896: buffer_put_string(&m, response, 16);
897: xfree(blob);
898:
899: mm_request_send(monitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
900: mm_request_receive_expect(monitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
901:
902: success = buffer_get_int(&m);
903: buffer_free(&m);
904:
905: return (success);
906: }
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