Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.46
1.46 ! stevesk 1: /* $OpenBSD: monitor_wrap.c,v 1.45 2006/03/30 09:58:15 djm Exp $ */
1.1 provos 2: /*
3: * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4: * Copyright 2002 Markus Friedl <markus@openbsd.org>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include "includes.h"
29:
1.46 ! stevesk 30: #include <sys/types.h>
! 31:
1.1 provos 32: #include <openssl/bn.h>
33: #include <openssl/dh.h>
1.46 ! stevesk 34:
! 35: #include <pwd.h>
1.1 provos 36:
37: #include "ssh.h"
38: #include "dh.h"
39: #include "kex.h"
40: #include "auth.h"
1.22 markus 41: #include "auth-options.h"
1.1 provos 42: #include "buffer.h"
43: #include "bufaux.h"
44: #include "packet.h"
45: #include "mac.h"
46: #include "log.h"
47: #include "zlib.h"
48: #include "monitor.h"
49: #include "monitor_wrap.h"
50: #include "xmalloc.h"
51: #include "atomicio.h"
52: #include "monitor_fdpass.h"
1.45 djm 53: #include "misc.h"
1.1 provos 54:
55: #include "auth.h"
56: #include "channels.h"
57: #include "session.h"
58:
1.29 markus 59: #ifdef GSSAPI
60: #include "ssh-gss.h"
61: #endif
62:
1.1 provos 63: /* Imports */
64: extern int compat20;
65: extern Newkeys *newkeys[];
66: extern z_stream incoming_stream;
67: extern z_stream outgoing_stream;
1.7 mouring 68: extern struct monitor *pmonitor;
1.1 provos 69: extern Buffer input, output;
1.39 dtucker 70: extern Buffer loginmsg;
1.1 provos 71:
1.32 markus 72: int
73: mm_is_monitor(void)
74: {
75: /*
76: * m_pid is only set in the privileged part, and
77: * points to the unprivileged child.
78: */
1.34 markus 79: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 80: }
81:
1.1 provos 82: void
1.36 avsm 83: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 84: {
1.13 deraadt 85: u_int mlen = buffer_len(m);
1.1 provos 86: u_char buf[5];
87:
1.8 markus 88: debug3("%s entering: type %d", __func__, type);
1.1 provos 89:
1.45 djm 90: put_u32(buf, mlen + 1);
1.10 deraadt 91: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 92: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 93: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 94: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.40 avsm 95: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 96: }
97:
98: void
1.36 avsm 99: mm_request_receive(int sock, Buffer *m)
1.1 provos 100: {
101: u_char buf[4];
1.13 deraadt 102: u_int msg_len;
1.1 provos 103:
1.8 markus 104: debug3("%s entering", __func__);
1.1 provos 105:
1.40 avsm 106: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
107: if (errno == EPIPE)
1.32 markus 108: cleanup_exit(255);
1.40 avsm 109: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 110: }
1.45 djm 111: msg_len = get_u32(buf);
1.1 provos 112: if (msg_len > 256 * 1024)
1.8 markus 113: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 114: buffer_clear(m);
115: buffer_append_space(m, msg_len);
1.40 avsm 116: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
117: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 118: }
119:
120: void
1.36 avsm 121: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 122: {
123: u_char rtype;
124:
1.8 markus 125: debug3("%s entering: type %d", __func__, type);
1.1 provos 126:
1.36 avsm 127: mm_request_receive(sock, m);
1.1 provos 128: rtype = buffer_get_char(m);
129: if (rtype != type)
1.8 markus 130: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 131: rtype, type);
132: }
133:
134: DH *
135: mm_choose_dh(int min, int nbits, int max)
136: {
137: BIGNUM *p, *g;
138: int success = 0;
139: Buffer m;
140:
141: buffer_init(&m);
142: buffer_put_int(&m, min);
143: buffer_put_int(&m, nbits);
144: buffer_put_int(&m, max);
145:
1.7 mouring 146: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 147:
1.8 markus 148: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 149: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 150:
151: success = buffer_get_char(&m);
152: if (success == 0)
1.8 markus 153: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 154:
155: if ((p = BN_new()) == NULL)
1.8 markus 156: fatal("%s: BN_new failed", __func__);
1.3 markus 157: if ((g = BN_new()) == NULL)
1.8 markus 158: fatal("%s: BN_new failed", __func__);
1.1 provos 159: buffer_get_bignum2(&m, p);
160: buffer_get_bignum2(&m, g);
161:
1.8 markus 162: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 163: buffer_free(&m);
164:
165: return (dh_new_group(g, p));
166: }
167:
168: int
169: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
170: {
1.7 mouring 171: Kex *kex = *pmonitor->m_pkex;
1.1 provos 172: Buffer m;
173:
1.8 markus 174: debug3("%s entering", __func__);
1.1 provos 175:
176: buffer_init(&m);
177: buffer_put_int(&m, kex->host_key_index(key));
178: buffer_put_string(&m, data, datalen);
179:
1.7 mouring 180: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 181:
1.8 markus 182: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 183: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 184: *sigp = buffer_get_string(&m, lenp);
185: buffer_free(&m);
186:
187: return (0);
188: }
189:
190: struct passwd *
1.37 dtucker 191: mm_getpwnamallow(const char *username)
1.1 provos 192: {
193: Buffer m;
194: struct passwd *pw;
195: u_int pwlen;
196:
1.8 markus 197: debug3("%s entering", __func__);
1.1 provos 198:
199: buffer_init(&m);
1.37 dtucker 200: buffer_put_cstring(&m, username);
1.1 provos 201:
1.7 mouring 202: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 203:
1.8 markus 204: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 205: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 206:
207: if (buffer_get_char(&m) == 0) {
208: buffer_free(&m);
209: return (NULL);
210: }
211: pw = buffer_get_string(&m, &pwlen);
212: if (pwlen != sizeof(struct passwd))
1.8 markus 213: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 214: pw->pw_name = buffer_get_string(&m, NULL);
215: pw->pw_passwd = buffer_get_string(&m, NULL);
216: pw->pw_gecos = buffer_get_string(&m, NULL);
217: pw->pw_class = buffer_get_string(&m, NULL);
218: pw->pw_dir = buffer_get_string(&m, NULL);
219: pw->pw_shell = buffer_get_string(&m, NULL);
220: buffer_free(&m);
221:
222: return (pw);
1.6 djm 223: }
224:
1.33 markus 225: char *
226: mm_auth2_read_banner(void)
1.6 djm 227: {
228: Buffer m;
229: char *banner;
230:
1.8 markus 231: debug3("%s entering", __func__);
1.6 djm 232:
233: buffer_init(&m);
1.7 mouring 234: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 235: buffer_clear(&m);
236:
1.33 markus 237: mm_request_receive_expect(pmonitor->m_recvfd,
238: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 239: banner = buffer_get_string(&m, NULL);
240: buffer_free(&m);
1.10 deraadt 241:
1.33 markus 242: /* treat empty banner as missing banner */
243: if (strlen(banner) == 0) {
244: xfree(banner);
245: banner = NULL;
246: }
1.6 djm 247: return (banner);
1.1 provos 248: }
249:
250: /* Inform the privileged process about service and style */
251:
252: void
253: mm_inform_authserv(char *service, char *style)
254: {
255: Buffer m;
256:
1.8 markus 257: debug3("%s entering", __func__);
1.1 provos 258:
259: buffer_init(&m);
260: buffer_put_cstring(&m, service);
261: buffer_put_cstring(&m, style ? style : "");
262:
1.7 mouring 263: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 264:
265: buffer_free(&m);
266: }
267:
268: /* Do the password authentication */
269: int
270: mm_auth_password(Authctxt *authctxt, char *password)
271: {
272: Buffer m;
273: int authenticated = 0;
274:
1.8 markus 275: debug3("%s entering", __func__);
1.1 provos 276:
277: buffer_init(&m);
278: buffer_put_cstring(&m, password);
1.7 mouring 279: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 280:
1.8 markus 281: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 282: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 283:
284: authenticated = buffer_get_int(&m);
285:
286: buffer_free(&m);
287:
1.3 markus 288: debug3("%s: user %sauthenticated",
1.8 markus 289: __func__, authenticated ? "" : "not ");
1.1 provos 290: return (authenticated);
291: }
292:
293: int
294: mm_user_key_allowed(struct passwd *pw, Key *key)
295: {
296: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
297: }
298:
299: int
300: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
301: Key *key)
302: {
303: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
304: }
305:
306: int
307: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
308: char *host, Key *key)
309: {
310: int ret;
311:
312: key->type = KEY_RSA; /* XXX hack for key_to_blob */
313: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
314: key->type = KEY_RSA1;
315: return (ret);
316: }
317:
1.2 markus 318: static void
1.1 provos 319: mm_send_debug(Buffer *m)
320: {
321: char *msg;
322:
323: while (buffer_len(m)) {
324: msg = buffer_get_string(m, NULL);
1.8 markus 325: debug3("%s: Sending debug: %s", __func__, msg);
1.1 provos 326: packet_send_debug("%s", msg);
327: xfree(msg);
328: }
329: }
330:
331: int
332: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
333: {
334: Buffer m;
335: u_char *blob;
336: u_int len;
1.22 markus 337: int allowed = 0, have_forced = 0;
1.1 provos 338:
1.8 markus 339: debug3("%s entering", __func__);
1.1 provos 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_int(&m, type);
347: buffer_put_cstring(&m, user ? user : "");
348: buffer_put_cstring(&m, host ? host : "");
349: buffer_put_string(&m, blob, len);
350: xfree(blob);
351:
1.7 mouring 352: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 353:
1.8 markus 354: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 355: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 356:
357: allowed = buffer_get_int(&m);
358:
1.22 markus 359: /* fake forced command */
360: auth_clear_options();
361: have_forced = buffer_get_int(&m);
362: forced_command = have_forced ? xstrdup("true") : NULL;
363:
1.1 provos 364: /* Send potential debug messages */
365: mm_send_debug(&m);
366:
367: buffer_free(&m);
368:
369: return (allowed);
370: }
371:
1.3 markus 372: /*
1.1 provos 373: * This key verify needs to send the key type along, because the
374: * privileged parent makes the decision if the key is allowed
375: * for authentication.
376: */
377:
378: int
379: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
380: {
381: Buffer m;
382: u_char *blob;
383: u_int len;
384: int verified = 0;
385:
1.8 markus 386: debug3("%s entering", __func__);
1.1 provos 387:
388: /* Convert the key to a blob and the pass it over */
389: if (!key_to_blob(key, &blob, &len))
390: return (0);
391:
392: buffer_init(&m);
393: buffer_put_string(&m, blob, len);
394: buffer_put_string(&m, sig, siglen);
395: buffer_put_string(&m, data, datalen);
396: xfree(blob);
397:
1.7 mouring 398: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 399:
1.8 markus 400: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 401: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 402:
403: verified = buffer_get_int(&m);
404:
405: buffer_free(&m);
406:
407: return (verified);
408: }
409:
410: /* Export key state after authentication */
411: Newkeys *
412: mm_newkeys_from_blob(u_char *blob, int blen)
413: {
414: Buffer b;
415: u_int len;
416: Newkeys *newkey = NULL;
417: Enc *enc;
418: Mac *mac;
419: Comp *comp;
420:
1.8 markus 421: debug3("%s: %p(%d)", __func__, blob, blen);
1.1 provos 422: #ifdef DEBUG_PK
423: dump_base64(stderr, blob, blen);
424: #endif
425: buffer_init(&b);
426: buffer_append(&b, blob, blen);
427:
428: newkey = xmalloc(sizeof(*newkey));
429: enc = &newkey->enc;
430: mac = &newkey->mac;
431: comp = &newkey->comp;
432:
433: /* Enc structure */
434: enc->name = buffer_get_string(&b, NULL);
435: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
436: enc->enabled = buffer_get_int(&b);
437: enc->block_size = buffer_get_int(&b);
438: enc->key = buffer_get_string(&b, &enc->key_len);
439: enc->iv = buffer_get_string(&b, &len);
440: if (len != enc->block_size)
1.12 deraadt 441: fatal("%s: bad ivlen: expected %u != %u", __func__,
1.1 provos 442: enc->block_size, len);
443:
444: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
1.8 markus 445: fatal("%s: bad cipher name %s or pointer %p", __func__,
1.1 provos 446: enc->name, enc->cipher);
447:
448: /* Mac structure */
449: mac->name = buffer_get_string(&b, NULL);
450: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
1.8 markus 451: fatal("%s: can not init mac %s", __func__, mac->name);
1.1 provos 452: mac->enabled = buffer_get_int(&b);
453: mac->key = buffer_get_string(&b, &len);
454: if (len > mac->key_len)
1.12 deraadt 455: fatal("%s: bad mac key length: %u > %d", __func__, len,
1.1 provos 456: mac->key_len);
457: mac->key_len = len;
458:
459: /* Comp structure */
460: comp->type = buffer_get_int(&b);
461: comp->enabled = buffer_get_int(&b);
462: comp->name = buffer_get_string(&b, NULL);
463:
464: len = buffer_len(&b);
465: if (len != 0)
1.12 deraadt 466: error("newkeys_from_blob: remaining bytes in blob %u", len);
1.1 provos 467: buffer_free(&b);
468: return (newkey);
469: }
470:
471: int
472: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
473: {
474: Buffer b;
475: int len;
476: Enc *enc;
477: Mac *mac;
478: Comp *comp;
479: Newkeys *newkey = newkeys[mode];
480:
1.8 markus 481: debug3("%s: converting %p", __func__, newkey);
1.1 provos 482:
483: if (newkey == NULL) {
1.8 markus 484: error("%s: newkey == NULL", __func__);
1.1 provos 485: return 0;
486: }
487: enc = &newkey->enc;
488: mac = &newkey->mac;
489: comp = &newkey->comp;
490:
491: buffer_init(&b);
492: /* Enc structure */
493: buffer_put_cstring(&b, enc->name);
494: /* The cipher struct is constant and shared, you export pointer */
495: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
496: buffer_put_int(&b, enc->enabled);
497: buffer_put_int(&b, enc->block_size);
498: buffer_put_string(&b, enc->key, enc->key_len);
499: packet_get_keyiv(mode, enc->iv, enc->block_size);
500: buffer_put_string(&b, enc->iv, enc->block_size);
501:
502: /* Mac structure */
503: buffer_put_cstring(&b, mac->name);
504: buffer_put_int(&b, mac->enabled);
505: buffer_put_string(&b, mac->key, mac->key_len);
506:
507: /* Comp structure */
508: buffer_put_int(&b, comp->type);
509: buffer_put_int(&b, comp->enabled);
510: buffer_put_cstring(&b, comp->name);
511:
512: len = buffer_len(&b);
1.16 markus 513: if (lenp != NULL)
514: *lenp = len;
515: if (blobp != NULL) {
516: *blobp = xmalloc(len);
517: memcpy(*blobp, buffer_ptr(&b), len);
518: }
1.1 provos 519: memset(buffer_ptr(&b), 0, len);
520: buffer_free(&b);
521: return len;
522: }
523:
1.2 markus 524: static void
1.1 provos 525: mm_send_kex(Buffer *m, Kex *kex)
526: {
527: buffer_put_string(m, kex->session_id, kex->session_id_len);
528: buffer_put_int(m, kex->we_need);
529: buffer_put_int(m, kex->hostkey_type);
530: buffer_put_int(m, kex->kex_type);
531: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
532: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
533: buffer_put_int(m, kex->flags);
534: buffer_put_cstring(m, kex->client_version_string);
535: buffer_put_cstring(m, kex->server_version_string);
536: }
537:
538: void
1.36 avsm 539: mm_send_keystate(struct monitor *monitor)
1.1 provos 540: {
541: Buffer m;
542: u_char *blob, *p;
543: u_int bloblen, plen;
1.25 markus 544: u_int32_t seqnr, packets;
545: u_int64_t blocks;
1.1 provos 546:
547: buffer_init(&m);
548:
549: if (!compat20) {
550: u_char iv[24];
1.11 markus 551: u_char *key;
552: u_int ivlen, keylen;
1.1 provos 553:
554: buffer_put_int(&m, packet_get_protocol_flags());
555:
556: buffer_put_int(&m, packet_get_ssh1_cipher());
557:
1.11 markus 558: debug3("%s: Sending ssh1 KEY+IV", __func__);
559: keylen = packet_get_encryption_key(NULL);
560: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
561: keylen = packet_get_encryption_key(key);
562: buffer_put_string(&m, key, keylen);
563: memset(key, 0, keylen);
564: xfree(key);
565:
1.1 provos 566: ivlen = packet_get_keyiv_len(MODE_OUT);
567: packet_get_keyiv(MODE_OUT, iv, ivlen);
568: buffer_put_string(&m, iv, ivlen);
569: ivlen = packet_get_keyiv_len(MODE_OUT);
570: packet_get_keyiv(MODE_IN, iv, ivlen);
571: buffer_put_string(&m, iv, ivlen);
572: goto skip;
573: } else {
574: /* Kex for rekeying */
1.36 avsm 575: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 576: }
577:
578: debug3("%s: Sending new keys: %p %p",
1.8 markus 579: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 580:
581: /* Keys from Kex */
582: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
1.8 markus 583: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 584:
585: buffer_put_string(&m, blob, bloblen);
586: xfree(blob);
587:
588: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 589: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 590:
591: buffer_put_string(&m, blob, bloblen);
592: xfree(blob);
593:
1.25 markus 594: packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
595: buffer_put_int(&m, seqnr);
596: buffer_put_int64(&m, blocks);
597: buffer_put_int(&m, packets);
1.26 markus 598: packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
1.25 markus 599: buffer_put_int(&m, seqnr);
600: buffer_put_int64(&m, blocks);
601: buffer_put_int(&m, packets);
1.1 provos 602:
1.8 markus 603: debug3("%s: New keys have been sent", __func__);
1.1 provos 604: skip:
605: /* More key context */
606: plen = packet_get_keycontext(MODE_OUT, NULL);
607: p = xmalloc(plen+1);
608: packet_get_keycontext(MODE_OUT, p);
609: buffer_put_string(&m, p, plen);
610: xfree(p);
611:
612: plen = packet_get_keycontext(MODE_IN, NULL);
613: p = xmalloc(plen+1);
614: packet_get_keycontext(MODE_IN, p);
615: buffer_put_string(&m, p, plen);
616: xfree(p);
617:
618: /* Compression state */
1.8 markus 619: debug3("%s: Sending compression state", __func__);
1.1 provos 620: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
621: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
622:
623: /* Network I/O buffers */
624: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
625: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
626:
1.36 avsm 627: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 628: debug3("%s: Finished sending state", __func__);
1.1 provos 629:
630: buffer_free(&m);
631: }
632:
633: int
1.42 deraadt 634: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 635: {
636: Buffer m;
1.39 dtucker 637: char *p, *msg;
1.1 provos 638: int success = 0;
639:
640: buffer_init(&m);
1.7 mouring 641: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 642:
1.8 markus 643: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 644: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 645:
646: success = buffer_get_int(&m);
647: if (success == 0) {
1.8 markus 648: debug3("%s: pty alloc failed", __func__);
1.1 provos 649: buffer_free(&m);
650: return (0);
651: }
652: p = buffer_get_string(&m, NULL);
1.39 dtucker 653: msg = buffer_get_string(&m, NULL);
1.1 provos 654: buffer_free(&m);
655:
656: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
657: xfree(p);
1.39 dtucker 658:
659: buffer_append(&loginmsg, msg, strlen(msg));
660: xfree(msg);
1.1 provos 661:
1.7 mouring 662: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
663: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 664:
665: /* Success */
666: return (1);
667: }
668:
669: void
1.32 markus 670: mm_session_pty_cleanup2(Session *s)
1.1 provos 671: {
672: Buffer m;
673:
674: if (s->ttyfd == -1)
675: return;
676: buffer_init(&m);
677: buffer_put_cstring(&m, s->tty);
1.7 mouring 678: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 679: buffer_free(&m);
1.3 markus 680:
1.1 provos 681: /* closed dup'ed master */
682: if (close(s->ptymaster) < 0)
683: error("close(s->ptymaster): %s", strerror(errno));
684:
685: /* unlink pty from session */
686: s->ttyfd = -1;
687: }
688:
689: /* Request process termination */
690:
691: void
692: mm_terminate(void)
693: {
694: Buffer m;
695:
696: buffer_init(&m);
1.7 mouring 697: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 698: buffer_free(&m);
699: }
700:
701: int
702: mm_ssh1_session_key(BIGNUM *num)
703: {
704: int rsafail;
705: Buffer m;
706:
707: buffer_init(&m);
708: buffer_put_bignum2(&m, num);
1.7 mouring 709: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 710:
1.7 mouring 711: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 712:
713: rsafail = buffer_get_int(&m);
714: buffer_get_bignum2(&m, num);
715:
716: buffer_free(&m);
717:
718: return (rsafail);
719: }
720:
1.2 markus 721: static void
1.1 provos 722: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
723: char ***prompts, u_int **echo_on)
724: {
1.10 deraadt 725: *name = xstrdup("");
726: *infotxt = xstrdup("");
1.1 provos 727: *numprompts = 1;
1.43 djm 728: *prompts = xcalloc(*numprompts, sizeof(char *));
729: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 730: (*echo_on)[0] = 0;
731: }
732:
733: int
734: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
735: u_int *numprompts, char ***prompts, u_int **echo_on)
736: {
737: Buffer m;
1.21 markus 738: u_int success;
1.1 provos 739: char *challenge;
740:
1.8 markus 741: debug3("%s: entering", __func__);
1.1 provos 742:
743: buffer_init(&m);
1.7 mouring 744: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 745:
1.7 mouring 746: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 747: &m);
1.21 markus 748: success = buffer_get_int(&m);
749: if (success == 0) {
1.8 markus 750: debug3("%s: no challenge", __func__);
1.1 provos 751: buffer_free(&m);
752: return (-1);
753: }
754:
755: /* Get the challenge, and format the response */
756: challenge = buffer_get_string(&m, NULL);
757: buffer_free(&m);
758:
759: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
760: (*prompts)[0] = challenge;
761:
1.8 markus 762: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 763:
764: return (0);
765: }
766:
767: int
768: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
769: {
770: Buffer m;
771: int authok;
772:
1.8 markus 773: debug3("%s: entering", __func__);
1.1 provos 774: if (numresponses != 1)
775: return (-1);
776:
777: buffer_init(&m);
778: buffer_put_cstring(&m, responses[0]);
1.7 mouring 779: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 780:
1.7 mouring 781: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 782: MONITOR_ANS_BSDAUTHRESPOND, &m);
783:
784: authok = buffer_get_int(&m);
785: buffer_free(&m);
786:
787: return ((authok == 0) ? -1 : 0);
788: }
789:
1.38 dtucker 790: #ifdef SKEY
1.1 provos 791: int
792: mm_skey_query(void *ctx, char **name, char **infotxt,
793: u_int *numprompts, char ***prompts, u_int **echo_on)
794: {
795: Buffer m;
1.21 markus 796: int len;
797: u_int success;
1.1 provos 798: char *p, *challenge;
799:
1.8 markus 800: debug3("%s: entering", __func__);
1.1 provos 801:
802: buffer_init(&m);
1.7 mouring 803: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 804:
1.7 mouring 805: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 806: &m);
1.21 markus 807: success = buffer_get_int(&m);
808: if (success == 0) {
1.8 markus 809: debug3("%s: no challenge", __func__);
1.1 provos 810: buffer_free(&m);
811: return (-1);
812: }
813:
814: /* Get the challenge, and format the response */
815: challenge = buffer_get_string(&m, NULL);
816: buffer_free(&m);
817:
1.8 markus 818: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 819:
820: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
821:
1.43 djm 822: xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1.1 provos 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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