Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.39.2.1
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"
1.39.2.1! brad 28: RCSID("$OpenBSD: monitor_wrap.c,v 1.40 2005/05/24 17:32:43 avsm 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"
1.22 markus 37: #include "auth-options.h"
1.1 provos 38: #include "buffer.h"
39: #include "bufaux.h"
40: #include "packet.h"
41: #include "mac.h"
42: #include "log.h"
43: #include "zlib.h"
44: #include "monitor.h"
45: #include "monitor_wrap.h"
46: #include "xmalloc.h"
47: #include "atomicio.h"
48: #include "monitor_fdpass.h"
49: #include "getput.h"
50:
51: #include "auth.h"
52: #include "channels.h"
53: #include "session.h"
54:
1.29 markus 55: #ifdef GSSAPI
56: #include "ssh-gss.h"
57: #endif
58:
1.1 provos 59: /* Imports */
60: extern int compat20;
61: extern Newkeys *newkeys[];
62: extern z_stream incoming_stream;
63: extern z_stream outgoing_stream;
1.7 mouring 64: extern struct monitor *pmonitor;
1.1 provos 65: extern Buffer input, output;
1.39 dtucker 66: extern Buffer loginmsg;
1.1 provos 67:
1.32 markus 68: int
69: mm_is_monitor(void)
70: {
71: /*
72: * m_pid is only set in the privileged part, and
73: * points to the unprivileged child.
74: */
1.34 markus 75: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 76: }
77:
1.1 provos 78: void
1.36 avsm 79: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 80: {
1.13 deraadt 81: u_int mlen = buffer_len(m);
1.1 provos 82: u_char buf[5];
83:
1.8 markus 84: debug3("%s entering: type %d", __func__, type);
1.1 provos 85:
86: PUT_32BIT(buf, mlen + 1);
1.10 deraadt 87: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 88: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.39.2.1! brad 89: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 90: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.39.2.1! brad 91: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 92: }
93:
94: void
1.36 avsm 95: mm_request_receive(int sock, Buffer *m)
1.1 provos 96: {
97: u_char buf[4];
1.13 deraadt 98: u_int msg_len;
1.1 provos 99:
1.8 markus 100: debug3("%s entering", __func__);
1.1 provos 101:
1.39.2.1! brad 102: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
! 103: if (errno == EPIPE)
1.32 markus 104: cleanup_exit(255);
1.39.2.1! brad 105: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 106: }
107: msg_len = GET_32BIT(buf);
108: if (msg_len > 256 * 1024)
1.8 markus 109: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 110: buffer_clear(m);
111: buffer_append_space(m, msg_len);
1.39.2.1! brad 112: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
! 113: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 114: }
115:
116: void
1.36 avsm 117: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 118: {
119: u_char rtype;
120:
1.8 markus 121: debug3("%s entering: type %d", __func__, type);
1.1 provos 122:
1.36 avsm 123: mm_request_receive(sock, m);
1.1 provos 124: rtype = buffer_get_char(m);
125: if (rtype != type)
1.8 markus 126: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 127: rtype, type);
128: }
129:
130: DH *
131: mm_choose_dh(int min, int nbits, int max)
132: {
133: BIGNUM *p, *g;
134: int success = 0;
135: Buffer m;
136:
137: buffer_init(&m);
138: buffer_put_int(&m, min);
139: buffer_put_int(&m, nbits);
140: buffer_put_int(&m, max);
141:
1.7 mouring 142: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 143:
1.8 markus 144: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 145: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 146:
147: success = buffer_get_char(&m);
148: if (success == 0)
1.8 markus 149: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 150:
151: if ((p = BN_new()) == NULL)
1.8 markus 152: fatal("%s: BN_new failed", __func__);
1.3 markus 153: if ((g = BN_new()) == NULL)
1.8 markus 154: fatal("%s: BN_new failed", __func__);
1.1 provos 155: buffer_get_bignum2(&m, p);
156: buffer_get_bignum2(&m, g);
157:
1.8 markus 158: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 159: buffer_free(&m);
160:
161: return (dh_new_group(g, p));
162: }
163:
164: int
165: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
166: {
1.7 mouring 167: Kex *kex = *pmonitor->m_pkex;
1.1 provos 168: Buffer m;
169:
1.8 markus 170: debug3("%s entering", __func__);
1.1 provos 171:
172: buffer_init(&m);
173: buffer_put_int(&m, kex->host_key_index(key));
174: buffer_put_string(&m, data, datalen);
175:
1.7 mouring 176: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 177:
1.8 markus 178: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 179: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 180: *sigp = buffer_get_string(&m, lenp);
181: buffer_free(&m);
182:
183: return (0);
184: }
185:
186: struct passwd *
1.37 dtucker 187: mm_getpwnamallow(const char *username)
1.1 provos 188: {
189: Buffer m;
190: struct passwd *pw;
191: u_int pwlen;
192:
1.8 markus 193: debug3("%s entering", __func__);
1.1 provos 194:
195: buffer_init(&m);
1.37 dtucker 196: buffer_put_cstring(&m, username);
1.1 provos 197:
1.7 mouring 198: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 199:
1.8 markus 200: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 201: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 202:
203: if (buffer_get_char(&m) == 0) {
204: buffer_free(&m);
205: return (NULL);
206: }
207: pw = buffer_get_string(&m, &pwlen);
208: if (pwlen != sizeof(struct passwd))
1.8 markus 209: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 210: pw->pw_name = buffer_get_string(&m, NULL);
211: pw->pw_passwd = buffer_get_string(&m, NULL);
212: pw->pw_gecos = buffer_get_string(&m, NULL);
213: pw->pw_class = buffer_get_string(&m, NULL);
214: pw->pw_dir = buffer_get_string(&m, NULL);
215: pw->pw_shell = buffer_get_string(&m, NULL);
216: buffer_free(&m);
217:
218: return (pw);
1.6 djm 219: }
220:
1.33 markus 221: char *
222: mm_auth2_read_banner(void)
1.6 djm 223: {
224: Buffer m;
225: char *banner;
226:
1.8 markus 227: debug3("%s entering", __func__);
1.6 djm 228:
229: buffer_init(&m);
1.7 mouring 230: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 231: buffer_clear(&m);
232:
1.33 markus 233: mm_request_receive_expect(pmonitor->m_recvfd,
234: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 235: banner = buffer_get_string(&m, NULL);
236: buffer_free(&m);
1.10 deraadt 237:
1.33 markus 238: /* treat empty banner as missing banner */
239: if (strlen(banner) == 0) {
240: xfree(banner);
241: banner = NULL;
242: }
1.6 djm 243: return (banner);
1.1 provos 244: }
245:
246: /* Inform the privileged process about service and style */
247:
248: void
249: mm_inform_authserv(char *service, char *style)
250: {
251: Buffer m;
252:
1.8 markus 253: debug3("%s entering", __func__);
1.1 provos 254:
255: buffer_init(&m);
256: buffer_put_cstring(&m, service);
257: buffer_put_cstring(&m, style ? style : "");
258:
1.7 mouring 259: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 260:
261: buffer_free(&m);
262: }
263:
264: /* Do the password authentication */
265: int
266: mm_auth_password(Authctxt *authctxt, char *password)
267: {
268: Buffer m;
269: int authenticated = 0;
270:
1.8 markus 271: debug3("%s entering", __func__);
1.1 provos 272:
273: buffer_init(&m);
274: buffer_put_cstring(&m, password);
1.7 mouring 275: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 276:
1.8 markus 277: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 278: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 279:
280: authenticated = buffer_get_int(&m);
281:
282: buffer_free(&m);
283:
1.3 markus 284: debug3("%s: user %sauthenticated",
1.8 markus 285: __func__, authenticated ? "" : "not ");
1.1 provos 286: return (authenticated);
287: }
288:
289: int
290: mm_user_key_allowed(struct passwd *pw, Key *key)
291: {
292: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
293: }
294:
295: int
296: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
297: Key *key)
298: {
299: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
300: }
301:
302: int
303: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
304: char *host, Key *key)
305: {
306: int ret;
307:
308: key->type = KEY_RSA; /* XXX hack for key_to_blob */
309: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
310: key->type = KEY_RSA1;
311: return (ret);
312: }
313:
1.2 markus 314: static void
1.1 provos 315: mm_send_debug(Buffer *m)
316: {
317: char *msg;
318:
319: while (buffer_len(m)) {
320: msg = buffer_get_string(m, NULL);
1.8 markus 321: debug3("%s: Sending debug: %s", __func__, msg);
1.1 provos 322: packet_send_debug("%s", msg);
323: xfree(msg);
324: }
325: }
326:
327: int
328: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
329: {
330: Buffer m;
331: u_char *blob;
332: u_int len;
1.22 markus 333: int allowed = 0, have_forced = 0;
1.1 provos 334:
1.8 markus 335: debug3("%s entering", __func__);
1.1 provos 336:
337: /* Convert the key to a blob and the pass it over */
338: if (!key_to_blob(key, &blob, &len))
339: return (0);
340:
341: buffer_init(&m);
342: buffer_put_int(&m, type);
343: buffer_put_cstring(&m, user ? user : "");
344: buffer_put_cstring(&m, host ? host : "");
345: buffer_put_string(&m, blob, len);
346: xfree(blob);
347:
1.7 mouring 348: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 349:
1.8 markus 350: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 351: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 352:
353: allowed = buffer_get_int(&m);
354:
1.22 markus 355: /* fake forced command */
356: auth_clear_options();
357: have_forced = buffer_get_int(&m);
358: forced_command = have_forced ? xstrdup("true") : NULL;
359:
1.1 provos 360: /* Send potential debug messages */
361: mm_send_debug(&m);
362:
363: buffer_free(&m);
364:
365: return (allowed);
366: }
367:
1.3 markus 368: /*
1.1 provos 369: * This key verify needs to send the key type along, because the
370: * privileged parent makes the decision if the key is allowed
371: * for authentication.
372: */
373:
374: int
375: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
376: {
377: Buffer m;
378: u_char *blob;
379: u_int len;
380: int verified = 0;
381:
1.8 markus 382: debug3("%s entering", __func__);
1.1 provos 383:
384: /* Convert the key to a blob and the pass it over */
385: if (!key_to_blob(key, &blob, &len))
386: return (0);
387:
388: buffer_init(&m);
389: buffer_put_string(&m, blob, len);
390: buffer_put_string(&m, sig, siglen);
391: buffer_put_string(&m, data, datalen);
392: xfree(blob);
393:
1.7 mouring 394: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 395:
1.8 markus 396: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 397: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 398:
399: verified = buffer_get_int(&m);
400:
401: buffer_free(&m);
402:
403: return (verified);
404: }
405:
406: /* Export key state after authentication */
407: Newkeys *
408: mm_newkeys_from_blob(u_char *blob, int blen)
409: {
410: Buffer b;
411: u_int len;
412: Newkeys *newkey = NULL;
413: Enc *enc;
414: Mac *mac;
415: Comp *comp;
416:
1.8 markus 417: debug3("%s: %p(%d)", __func__, blob, blen);
1.1 provos 418: #ifdef DEBUG_PK
419: dump_base64(stderr, blob, blen);
420: #endif
421: buffer_init(&b);
422: buffer_append(&b, blob, blen);
423:
424: newkey = xmalloc(sizeof(*newkey));
425: enc = &newkey->enc;
426: mac = &newkey->mac;
427: comp = &newkey->comp;
428:
429: /* Enc structure */
430: enc->name = buffer_get_string(&b, NULL);
431: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
432: enc->enabled = buffer_get_int(&b);
433: enc->block_size = buffer_get_int(&b);
434: enc->key = buffer_get_string(&b, &enc->key_len);
435: enc->iv = buffer_get_string(&b, &len);
436: if (len != enc->block_size)
1.12 deraadt 437: fatal("%s: bad ivlen: expected %u != %u", __func__,
1.1 provos 438: enc->block_size, len);
439:
440: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
1.8 markus 441: fatal("%s: bad cipher name %s or pointer %p", __func__,
1.1 provos 442: enc->name, enc->cipher);
443:
444: /* Mac structure */
445: mac->name = buffer_get_string(&b, NULL);
446: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
1.8 markus 447: fatal("%s: can not init mac %s", __func__, mac->name);
1.1 provos 448: mac->enabled = buffer_get_int(&b);
449: mac->key = buffer_get_string(&b, &len);
450: if (len > mac->key_len)
1.12 deraadt 451: fatal("%s: bad mac key length: %u > %d", __func__, len,
1.1 provos 452: mac->key_len);
453: mac->key_len = len;
454:
455: /* Comp structure */
456: comp->type = buffer_get_int(&b);
457: comp->enabled = buffer_get_int(&b);
458: comp->name = buffer_get_string(&b, NULL);
459:
460: len = buffer_len(&b);
461: if (len != 0)
1.12 deraadt 462: error("newkeys_from_blob: remaining bytes in blob %u", len);
1.1 provos 463: buffer_free(&b);
464: return (newkey);
465: }
466:
467: int
468: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
469: {
470: Buffer b;
471: int len;
472: Enc *enc;
473: Mac *mac;
474: Comp *comp;
475: Newkeys *newkey = newkeys[mode];
476:
1.8 markus 477: debug3("%s: converting %p", __func__, newkey);
1.1 provos 478:
479: if (newkey == NULL) {
1.8 markus 480: error("%s: newkey == NULL", __func__);
1.1 provos 481: return 0;
482: }
483: enc = &newkey->enc;
484: mac = &newkey->mac;
485: comp = &newkey->comp;
486:
487: buffer_init(&b);
488: /* Enc structure */
489: buffer_put_cstring(&b, enc->name);
490: /* The cipher struct is constant and shared, you export pointer */
491: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
492: buffer_put_int(&b, enc->enabled);
493: buffer_put_int(&b, enc->block_size);
494: buffer_put_string(&b, enc->key, enc->key_len);
495: packet_get_keyiv(mode, enc->iv, enc->block_size);
496: buffer_put_string(&b, enc->iv, enc->block_size);
497:
498: /* Mac structure */
499: buffer_put_cstring(&b, mac->name);
500: buffer_put_int(&b, mac->enabled);
501: buffer_put_string(&b, mac->key, mac->key_len);
502:
503: /* Comp structure */
504: buffer_put_int(&b, comp->type);
505: buffer_put_int(&b, comp->enabled);
506: buffer_put_cstring(&b, comp->name);
507:
508: len = buffer_len(&b);
1.16 markus 509: if (lenp != NULL)
510: *lenp = len;
511: if (blobp != NULL) {
512: *blobp = xmalloc(len);
513: memcpy(*blobp, buffer_ptr(&b), len);
514: }
1.1 provos 515: memset(buffer_ptr(&b), 0, len);
516: buffer_free(&b);
517: return len;
518: }
519:
1.2 markus 520: static void
1.1 provos 521: mm_send_kex(Buffer *m, Kex *kex)
522: {
523: buffer_put_string(m, kex->session_id, kex->session_id_len);
524: buffer_put_int(m, kex->we_need);
525: buffer_put_int(m, kex->hostkey_type);
526: buffer_put_int(m, kex->kex_type);
527: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
528: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
529: buffer_put_int(m, kex->flags);
530: buffer_put_cstring(m, kex->client_version_string);
531: buffer_put_cstring(m, kex->server_version_string);
532: }
533:
534: void
1.36 avsm 535: mm_send_keystate(struct monitor *monitor)
1.1 provos 536: {
537: Buffer m;
538: u_char *blob, *p;
539: u_int bloblen, plen;
1.25 markus 540: u_int32_t seqnr, packets;
541: u_int64_t blocks;
1.1 provos 542:
543: buffer_init(&m);
544:
545: if (!compat20) {
546: u_char iv[24];
1.11 markus 547: u_char *key;
548: u_int ivlen, keylen;
1.1 provos 549:
550: buffer_put_int(&m, packet_get_protocol_flags());
551:
552: buffer_put_int(&m, packet_get_ssh1_cipher());
553:
1.11 markus 554: debug3("%s: Sending ssh1 KEY+IV", __func__);
555: keylen = packet_get_encryption_key(NULL);
556: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
557: keylen = packet_get_encryption_key(key);
558: buffer_put_string(&m, key, keylen);
559: memset(key, 0, keylen);
560: xfree(key);
561:
1.1 provos 562: ivlen = packet_get_keyiv_len(MODE_OUT);
563: packet_get_keyiv(MODE_OUT, iv, ivlen);
564: buffer_put_string(&m, iv, ivlen);
565: ivlen = packet_get_keyiv_len(MODE_OUT);
566: packet_get_keyiv(MODE_IN, iv, ivlen);
567: buffer_put_string(&m, iv, ivlen);
568: goto skip;
569: } else {
570: /* Kex for rekeying */
1.36 avsm 571: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 572: }
573:
574: debug3("%s: Sending new keys: %p %p",
1.8 markus 575: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 576:
577: /* Keys from Kex */
578: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
1.8 markus 579: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 580:
581: buffer_put_string(&m, blob, bloblen);
582: xfree(blob);
583:
584: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 585: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 586:
587: buffer_put_string(&m, blob, bloblen);
588: xfree(blob);
589:
1.25 markus 590: packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
591: buffer_put_int(&m, seqnr);
592: buffer_put_int64(&m, blocks);
593: buffer_put_int(&m, packets);
1.26 markus 594: packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
1.25 markus 595: buffer_put_int(&m, seqnr);
596: buffer_put_int64(&m, blocks);
597: buffer_put_int(&m, packets);
1.1 provos 598:
1.8 markus 599: debug3("%s: New keys have been sent", __func__);
1.1 provos 600: skip:
601: /* More key context */
602: plen = packet_get_keycontext(MODE_OUT, NULL);
603: p = xmalloc(plen+1);
604: packet_get_keycontext(MODE_OUT, p);
605: buffer_put_string(&m, p, plen);
606: xfree(p);
607:
608: plen = packet_get_keycontext(MODE_IN, NULL);
609: p = xmalloc(plen+1);
610: packet_get_keycontext(MODE_IN, p);
611: buffer_put_string(&m, p, plen);
612: xfree(p);
613:
614: /* Compression state */
1.8 markus 615: debug3("%s: Sending compression state", __func__);
1.1 provos 616: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
617: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
618:
619: /* Network I/O buffers */
620: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
621: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
622:
1.36 avsm 623: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 624: debug3("%s: Finished sending state", __func__);
1.1 provos 625:
626: buffer_free(&m);
627: }
628:
629: int
630: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
631: {
632: Buffer m;
1.39 dtucker 633: char *p, *msg;
1.1 provos 634: int success = 0;
635:
636: buffer_init(&m);
1.7 mouring 637: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 638:
1.8 markus 639: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 640: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 641:
642: success = buffer_get_int(&m);
643: if (success == 0) {
1.8 markus 644: debug3("%s: pty alloc failed", __func__);
1.1 provos 645: buffer_free(&m);
646: return (0);
647: }
648: p = buffer_get_string(&m, NULL);
1.39 dtucker 649: msg = buffer_get_string(&m, NULL);
1.1 provos 650: buffer_free(&m);
651:
652: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
653: xfree(p);
1.39 dtucker 654:
655: buffer_append(&loginmsg, msg, strlen(msg));
656: xfree(msg);
1.1 provos 657:
1.7 mouring 658: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
659: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 660:
661: /* Success */
662: return (1);
663: }
664:
665: void
1.32 markus 666: mm_session_pty_cleanup2(Session *s)
1.1 provos 667: {
668: Buffer m;
669:
670: if (s->ttyfd == -1)
671: return;
672: buffer_init(&m);
673: buffer_put_cstring(&m, s->tty);
1.7 mouring 674: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 675: buffer_free(&m);
1.3 markus 676:
1.1 provos 677: /* closed dup'ed master */
678: if (close(s->ptymaster) < 0)
679: error("close(s->ptymaster): %s", strerror(errno));
680:
681: /* unlink pty from session */
682: s->ttyfd = -1;
683: }
684:
685: /* Request process termination */
686:
687: void
688: mm_terminate(void)
689: {
690: Buffer m;
691:
692: buffer_init(&m);
1.7 mouring 693: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 694: buffer_free(&m);
695: }
696:
697: int
698: mm_ssh1_session_key(BIGNUM *num)
699: {
700: int rsafail;
701: Buffer m;
702:
703: buffer_init(&m);
704: buffer_put_bignum2(&m, num);
1.7 mouring 705: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 706:
1.7 mouring 707: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 708:
709: rsafail = buffer_get_int(&m);
710: buffer_get_bignum2(&m, num);
711:
712: buffer_free(&m);
713:
714: return (rsafail);
715: }
716:
1.2 markus 717: static void
1.1 provos 718: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
719: char ***prompts, u_int **echo_on)
720: {
1.10 deraadt 721: *name = xstrdup("");
722: *infotxt = xstrdup("");
1.1 provos 723: *numprompts = 1;
1.14 deraadt 724: *prompts = xmalloc(*numprompts * sizeof(char *));
1.1 provos 725: *echo_on = xmalloc(*numprompts * sizeof(u_int));
726: (*echo_on)[0] = 0;
727: }
728:
729: int
730: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
731: u_int *numprompts, char ***prompts, u_int **echo_on)
732: {
733: Buffer m;
1.21 markus 734: u_int success;
1.1 provos 735: char *challenge;
736:
1.8 markus 737: debug3("%s: entering", __func__);
1.1 provos 738:
739: buffer_init(&m);
1.7 mouring 740: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 741:
1.7 mouring 742: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 743: &m);
1.21 markus 744: success = buffer_get_int(&m);
745: if (success == 0) {
1.8 markus 746: debug3("%s: no challenge", __func__);
1.1 provos 747: buffer_free(&m);
748: return (-1);
749: }
750:
751: /* Get the challenge, and format the response */
752: challenge = buffer_get_string(&m, NULL);
753: buffer_free(&m);
754:
755: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
756: (*prompts)[0] = challenge;
757:
1.8 markus 758: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 759:
760: return (0);
761: }
762:
763: int
764: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
765: {
766: Buffer m;
767: int authok;
768:
1.8 markus 769: debug3("%s: entering", __func__);
1.1 provos 770: if (numresponses != 1)
771: return (-1);
772:
773: buffer_init(&m);
774: buffer_put_cstring(&m, responses[0]);
1.7 mouring 775: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 776:
1.7 mouring 777: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 778: MONITOR_ANS_BSDAUTHRESPOND, &m);
779:
780: authok = buffer_get_int(&m);
781: buffer_free(&m);
782:
783: return ((authok == 0) ? -1 : 0);
784: }
785:
1.38 dtucker 786: #ifdef SKEY
1.1 provos 787: int
788: mm_skey_query(void *ctx, char **name, char **infotxt,
789: u_int *numprompts, char ***prompts, u_int **echo_on)
790: {
791: Buffer m;
1.21 markus 792: int len;
793: u_int success;
1.1 provos 794: char *p, *challenge;
795:
1.8 markus 796: debug3("%s: entering", __func__);
1.1 provos 797:
798: buffer_init(&m);
1.7 mouring 799: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 800:
1.7 mouring 801: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 802: &m);
1.21 markus 803: success = buffer_get_int(&m);
804: if (success == 0) {
1.8 markus 805: debug3("%s: no challenge", __func__);
1.1 provos 806: buffer_free(&m);
807: return (-1);
808: }
809:
810: /* Get the challenge, and format the response */
811: challenge = buffer_get_string(&m, NULL);
812: buffer_free(&m);
813:
1.8 markus 814: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 815:
816: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
817:
818: len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
819: p = xmalloc(len);
820: strlcpy(p, challenge, len);
821: strlcat(p, SKEY_PROMPT, len);
822: (*prompts)[0] = p;
823: xfree(challenge);
824:
825: return (0);
826: }
827:
828: int
829: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
830: {
831: Buffer m;
832: int authok;
833:
1.8 markus 834: debug3("%s: entering", __func__);
1.1 provos 835: if (numresponses != 1)
836: return (-1);
837:
838: buffer_init(&m);
839: buffer_put_cstring(&m, responses[0]);
1.7 mouring 840: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1.1 provos 841:
1.7 mouring 842: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 843: MONITOR_ANS_SKEYRESPOND, &m);
844:
845: authok = buffer_get_int(&m);
846: buffer_free(&m);
847:
848: return ((authok == 0) ? -1 : 0);
849: }
1.38 dtucker 850: #endif /* SKEY */
1.1 provos 851:
852: void
853: mm_ssh1_session_id(u_char session_id[16])
854: {
855: Buffer m;
856: int i;
857:
1.8 markus 858: debug3("%s entering", __func__);
1.1 provos 859:
860: buffer_init(&m);
861: for (i = 0; i < 16; i++)
862: buffer_put_char(&m, session_id[i]);
863:
1.7 mouring 864: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 865: buffer_free(&m);
866: }
867:
868: int
869: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
870: {
871: Buffer m;
872: Key *key;
873: u_char *blob;
874: u_int blen;
1.22 markus 875: int allowed = 0, have_forced = 0;
1.1 provos 876:
1.8 markus 877: debug3("%s entering", __func__);
1.1 provos 878:
879: buffer_init(&m);
880: buffer_put_bignum2(&m, client_n);
881:
1.7 mouring 882: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
883: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 884:
885: allowed = buffer_get_int(&m);
1.22 markus 886:
887: /* fake forced command */
888: auth_clear_options();
889: have_forced = buffer_get_int(&m);
890: forced_command = have_forced ? xstrdup("true") : NULL;
1.1 provos 891:
892: if (allowed && rkey != NULL) {
893: blob = buffer_get_string(&m, &blen);
894: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 895: fatal("%s: key_from_blob failed", __func__);
1.1 provos 896: *rkey = key;
897: xfree(blob);
898: }
899: mm_send_debug(&m);
900: buffer_free(&m);
901:
902: return (allowed);
903: }
904:
905: BIGNUM *
906: mm_auth_rsa_generate_challenge(Key *key)
907: {
908: Buffer m;
909: BIGNUM *challenge;
910: u_char *blob;
911: u_int blen;
912:
1.8 markus 913: debug3("%s entering", __func__);
1.1 provos 914:
915: if ((challenge = BN_new()) == NULL)
1.8 markus 916: fatal("%s: BN_new failed", __func__);
1.1 provos 917:
918: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
919: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 920: fatal("%s: key_to_blob failed", __func__);
1.1 provos 921: key->type = KEY_RSA1;
922:
923: buffer_init(&m);
924: buffer_put_string(&m, blob, blen);
925: xfree(blob);
926:
1.7 mouring 927: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
928: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 929:
930: buffer_get_bignum2(&m, challenge);
931: buffer_free(&m);
932:
933: return (challenge);
934: }
935:
936: int
937: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
938: {
939: Buffer m;
940: u_char *blob;
941: u_int blen;
942: int success = 0;
943:
1.8 markus 944: debug3("%s entering", __func__);
1.1 provos 945:
946: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
947: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 948: fatal("%s: key_to_blob failed", __func__);
1.1 provos 949: key->type = KEY_RSA1;
950:
951: buffer_init(&m);
952: buffer_put_string(&m, blob, blen);
953: buffer_put_string(&m, response, 16);
954: xfree(blob);
955:
1.7 mouring 956: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
957: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 958:
959: success = buffer_get_int(&m);
960: buffer_free(&m);
961:
962: return (success);
963: }
1.29 markus 964:
965: #ifdef GSSAPI
966: OM_uint32
1.36 avsm 967: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 968: {
969: Buffer m;
970: OM_uint32 major;
971:
972: /* Client doesn't get to see the context */
973: *ctx = NULL;
974:
975: buffer_init(&m);
1.36 avsm 976: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 977:
978: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
979: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
980:
981: major = buffer_get_int(&m);
982:
983: buffer_free(&m);
984: return (major);
985: }
986:
987: OM_uint32
988: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
989: gss_buffer_desc *out, OM_uint32 *flags)
990: {
991: Buffer m;
992: OM_uint32 major;
1.30 deraadt 993: u_int len;
1.29 markus 994:
995: buffer_init(&m);
996: buffer_put_string(&m, in->value, in->length);
997:
998: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
999: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1000:
1001: major = buffer_get_int(&m);
1.30 deraadt 1002: out->value = buffer_get_string(&m, &len);
1003: out->length = len;
1.29 markus 1004: if (flags)
1005: *flags = buffer_get_int(&m);
1006:
1007: buffer_free(&m);
1008:
1009: return (major);
1.35 markus 1010: }
1011:
1012: OM_uint32
1013: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1014: {
1015: Buffer m;
1016: OM_uint32 major;
1017:
1018: buffer_init(&m);
1019: buffer_put_string(&m, gssbuf->value, gssbuf->length);
1020: buffer_put_string(&m, gssmic->value, gssmic->length);
1021:
1022: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1023: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1024: &m);
1025:
1026: major = buffer_get_int(&m);
1027: buffer_free(&m);
1028: return(major);
1.29 markus 1029: }
1030:
1031: int
1032: mm_ssh_gssapi_userok(char *user)
1033: {
1034: Buffer m;
1035: int authenticated = 0;
1036:
1037: buffer_init(&m);
1038:
1039: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1040: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1041: &m);
1042:
1043: authenticated = buffer_get_int(&m);
1044:
1045: buffer_free(&m);
1046: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1047: return (authenticated);
1048: }
1049: #endif /* GSSAPI */
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