Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.50
1.50 ! deraadt 1: /* $OpenBSD: monitor_wrap.c,v 1.49 2006/08/01 23:22:47 stevesk 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:
1.46 stevesk 28: #include <sys/types.h>
29:
1.1 provos 30: #include <openssl/bn.h>
31: #include <openssl/dh.h>
1.46 stevesk 32:
1.47 stevesk 33: #include <errno.h>
1.46 stevesk 34: #include <pwd.h>
1.50 ! deraadt 35: #include <signal.h>
1.49 stevesk 36: #include <stdio.h>
1.48 stevesk 37: #include <string.h>
1.1 provos 38:
1.50 ! deraadt 39: #include "xmalloc.h"
1.1 provos 40: #include "ssh.h"
41: #include "dh.h"
1.50 ! deraadt 42: #include "buffer.h"
! 43: #include "key.h"
! 44: #include "cipher.h"
1.1 provos 45: #include "kex.h"
1.50 ! deraadt 46: #include "hostfile.h"
1.1 provos 47: #include "auth.h"
1.22 markus 48: #include "auth-options.h"
1.1 provos 49: #include "packet.h"
50: #include "mac.h"
51: #include "log.h"
52: #include "zlib.h"
53: #include "monitor.h"
1.50 ! deraadt 54: #ifdef GSSAPI
! 55: #include "ssh-gss.h"
! 56: #endif
1.1 provos 57: #include "monitor_wrap.h"
58: #include "atomicio.h"
59: #include "monitor_fdpass.h"
1.45 djm 60: #include "misc.h"
1.1 provos 61:
62: #include "channels.h"
63: #include "session.h"
1.29 markus 64:
1.1 provos 65: /* Imports */
66: extern int compat20;
67: extern Newkeys *newkeys[];
68: extern z_stream incoming_stream;
69: extern z_stream outgoing_stream;
1.7 mouring 70: extern struct monitor *pmonitor;
1.1 provos 71: extern Buffer input, output;
1.39 dtucker 72: extern Buffer loginmsg;
1.1 provos 73:
1.32 markus 74: int
75: mm_is_monitor(void)
76: {
77: /*
78: * m_pid is only set in the privileged part, and
79: * points to the unprivileged child.
80: */
1.34 markus 81: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 82: }
83:
1.1 provos 84: void
1.36 avsm 85: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 86: {
1.13 deraadt 87: u_int mlen = buffer_len(m);
1.1 provos 88: u_char buf[5];
89:
1.8 markus 90: debug3("%s entering: type %d", __func__, type);
1.1 provos 91:
1.45 djm 92: put_u32(buf, mlen + 1);
1.10 deraadt 93: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 94: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 95: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 96: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.40 avsm 97: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 98: }
99:
100: void
1.36 avsm 101: mm_request_receive(int sock, Buffer *m)
1.1 provos 102: {
103: u_char buf[4];
1.13 deraadt 104: u_int msg_len;
1.1 provos 105:
1.8 markus 106: debug3("%s entering", __func__);
1.1 provos 107:
1.40 avsm 108: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
109: if (errno == EPIPE)
1.32 markus 110: cleanup_exit(255);
1.40 avsm 111: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 112: }
1.45 djm 113: msg_len = get_u32(buf);
1.1 provos 114: if (msg_len > 256 * 1024)
1.8 markus 115: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 116: buffer_clear(m);
117: buffer_append_space(m, msg_len);
1.40 avsm 118: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
119: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 120: }
121:
122: void
1.36 avsm 123: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 124: {
125: u_char rtype;
126:
1.8 markus 127: debug3("%s entering: type %d", __func__, type);
1.1 provos 128:
1.36 avsm 129: mm_request_receive(sock, m);
1.1 provos 130: rtype = buffer_get_char(m);
131: if (rtype != type)
1.8 markus 132: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 133: rtype, type);
134: }
135:
136: DH *
137: mm_choose_dh(int min, int nbits, int max)
138: {
139: BIGNUM *p, *g;
140: int success = 0;
141: Buffer m;
142:
143: buffer_init(&m);
144: buffer_put_int(&m, min);
145: buffer_put_int(&m, nbits);
146: buffer_put_int(&m, max);
147:
1.7 mouring 148: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 149:
1.8 markus 150: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 151: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 152:
153: success = buffer_get_char(&m);
154: if (success == 0)
1.8 markus 155: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 156:
157: if ((p = BN_new()) == NULL)
1.8 markus 158: fatal("%s: BN_new failed", __func__);
1.3 markus 159: if ((g = BN_new()) == NULL)
1.8 markus 160: fatal("%s: BN_new failed", __func__);
1.1 provos 161: buffer_get_bignum2(&m, p);
162: buffer_get_bignum2(&m, g);
163:
1.8 markus 164: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 165: buffer_free(&m);
166:
167: return (dh_new_group(g, p));
168: }
169:
170: int
171: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
172: {
1.7 mouring 173: Kex *kex = *pmonitor->m_pkex;
1.1 provos 174: Buffer m;
175:
1.8 markus 176: debug3("%s entering", __func__);
1.1 provos 177:
178: buffer_init(&m);
179: buffer_put_int(&m, kex->host_key_index(key));
180: buffer_put_string(&m, data, datalen);
181:
1.7 mouring 182: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 183:
1.8 markus 184: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 185: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 186: *sigp = buffer_get_string(&m, lenp);
187: buffer_free(&m);
188:
189: return (0);
190: }
191:
192: struct passwd *
1.37 dtucker 193: mm_getpwnamallow(const char *username)
1.1 provos 194: {
195: Buffer m;
196: struct passwd *pw;
197: u_int pwlen;
198:
1.8 markus 199: debug3("%s entering", __func__);
1.1 provos 200:
201: buffer_init(&m);
1.37 dtucker 202: buffer_put_cstring(&m, username);
1.1 provos 203:
1.7 mouring 204: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 205:
1.8 markus 206: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 207: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 208:
209: if (buffer_get_char(&m) == 0) {
210: buffer_free(&m);
211: return (NULL);
212: }
213: pw = buffer_get_string(&m, &pwlen);
214: if (pwlen != sizeof(struct passwd))
1.8 markus 215: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 216: pw->pw_name = buffer_get_string(&m, NULL);
217: pw->pw_passwd = buffer_get_string(&m, NULL);
218: pw->pw_gecos = buffer_get_string(&m, NULL);
219: pw->pw_class = buffer_get_string(&m, NULL);
220: pw->pw_dir = buffer_get_string(&m, NULL);
221: pw->pw_shell = buffer_get_string(&m, NULL);
222: buffer_free(&m);
223:
224: return (pw);
1.6 djm 225: }
226:
1.33 markus 227: char *
228: mm_auth2_read_banner(void)
1.6 djm 229: {
230: Buffer m;
231: char *banner;
232:
1.8 markus 233: debug3("%s entering", __func__);
1.6 djm 234:
235: buffer_init(&m);
1.7 mouring 236: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 237: buffer_clear(&m);
238:
1.33 markus 239: mm_request_receive_expect(pmonitor->m_recvfd,
240: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 241: banner = buffer_get_string(&m, NULL);
242: buffer_free(&m);
1.10 deraadt 243:
1.33 markus 244: /* treat empty banner as missing banner */
245: if (strlen(banner) == 0) {
246: xfree(banner);
247: banner = NULL;
248: }
1.6 djm 249: return (banner);
1.1 provos 250: }
251:
252: /* Inform the privileged process about service and style */
253:
254: void
255: mm_inform_authserv(char *service, char *style)
256: {
257: Buffer m;
258:
1.8 markus 259: debug3("%s entering", __func__);
1.1 provos 260:
261: buffer_init(&m);
262: buffer_put_cstring(&m, service);
263: buffer_put_cstring(&m, style ? style : "");
264:
1.7 mouring 265: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 266:
267: buffer_free(&m);
268: }
269:
270: /* Do the password authentication */
271: int
272: mm_auth_password(Authctxt *authctxt, char *password)
273: {
274: Buffer m;
275: int authenticated = 0;
276:
1.8 markus 277: debug3("%s entering", __func__);
1.1 provos 278:
279: buffer_init(&m);
280: buffer_put_cstring(&m, password);
1.7 mouring 281: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 282:
1.8 markus 283: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 284: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 285:
286: authenticated = buffer_get_int(&m);
287:
288: buffer_free(&m);
289:
1.3 markus 290: debug3("%s: user %sauthenticated",
1.8 markus 291: __func__, authenticated ? "" : "not ");
1.1 provos 292: return (authenticated);
293: }
294:
295: int
296: mm_user_key_allowed(struct passwd *pw, Key *key)
297: {
298: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
299: }
300:
301: int
302: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
303: Key *key)
304: {
305: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
306: }
307:
308: int
309: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
310: char *host, Key *key)
311: {
312: int ret;
313:
314: key->type = KEY_RSA; /* XXX hack for key_to_blob */
315: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
316: key->type = KEY_RSA1;
317: return (ret);
318: }
319:
1.2 markus 320: static void
1.1 provos 321: mm_send_debug(Buffer *m)
322: {
323: char *msg;
324:
325: while (buffer_len(m)) {
326: msg = buffer_get_string(m, NULL);
1.8 markus 327: debug3("%s: Sending debug: %s", __func__, msg);
1.1 provos 328: packet_send_debug("%s", msg);
329: xfree(msg);
330: }
331: }
332:
333: int
334: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
335: {
336: Buffer m;
337: u_char *blob;
338: u_int len;
1.22 markus 339: int allowed = 0, have_forced = 0;
1.1 provos 340:
1.8 markus 341: debug3("%s entering", __func__);
1.1 provos 342:
343: /* Convert the key to a blob and the pass it over */
344: if (!key_to_blob(key, &blob, &len))
345: return (0);
346:
347: buffer_init(&m);
348: buffer_put_int(&m, type);
349: buffer_put_cstring(&m, user ? user : "");
350: buffer_put_cstring(&m, host ? host : "");
351: buffer_put_string(&m, blob, len);
352: xfree(blob);
353:
1.7 mouring 354: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 355:
1.8 markus 356: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 357: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 358:
359: allowed = buffer_get_int(&m);
360:
1.22 markus 361: /* fake forced command */
362: auth_clear_options();
363: have_forced = buffer_get_int(&m);
364: forced_command = have_forced ? xstrdup("true") : NULL;
365:
1.1 provos 366: /* Send potential debug messages */
367: mm_send_debug(&m);
368:
369: buffer_free(&m);
370:
371: return (allowed);
372: }
373:
1.3 markus 374: /*
1.1 provos 375: * This key verify needs to send the key type along, because the
376: * privileged parent makes the decision if the key is allowed
377: * for authentication.
378: */
379:
380: int
381: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
382: {
383: Buffer m;
384: u_char *blob;
385: u_int len;
386: int verified = 0;
387:
1.8 markus 388: debug3("%s entering", __func__);
1.1 provos 389:
390: /* Convert the key to a blob and the pass it over */
391: if (!key_to_blob(key, &blob, &len))
392: return (0);
393:
394: buffer_init(&m);
395: buffer_put_string(&m, blob, len);
396: buffer_put_string(&m, sig, siglen);
397: buffer_put_string(&m, data, datalen);
398: xfree(blob);
399:
1.7 mouring 400: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 401:
1.8 markus 402: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 403: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 404:
405: verified = buffer_get_int(&m);
406:
407: buffer_free(&m);
408:
409: return (verified);
410: }
411:
412: /* Export key state after authentication */
413: Newkeys *
414: mm_newkeys_from_blob(u_char *blob, int blen)
415: {
416: Buffer b;
417: u_int len;
418: Newkeys *newkey = NULL;
419: Enc *enc;
420: Mac *mac;
421: Comp *comp;
422:
1.8 markus 423: debug3("%s: %p(%d)", __func__, blob, blen);
1.1 provos 424: #ifdef DEBUG_PK
425: dump_base64(stderr, blob, blen);
426: #endif
427: buffer_init(&b);
428: buffer_append(&b, blob, blen);
429:
430: newkey = xmalloc(sizeof(*newkey));
431: enc = &newkey->enc;
432: mac = &newkey->mac;
433: comp = &newkey->comp;
434:
435: /* Enc structure */
436: enc->name = buffer_get_string(&b, NULL);
437: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
438: enc->enabled = buffer_get_int(&b);
439: enc->block_size = buffer_get_int(&b);
440: enc->key = buffer_get_string(&b, &enc->key_len);
441: enc->iv = buffer_get_string(&b, &len);
442: if (len != enc->block_size)
1.12 deraadt 443: fatal("%s: bad ivlen: expected %u != %u", __func__,
1.1 provos 444: enc->block_size, len);
445:
446: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
1.8 markus 447: fatal("%s: bad cipher name %s or pointer %p", __func__,
1.1 provos 448: enc->name, enc->cipher);
449:
450: /* Mac structure */
451: mac->name = buffer_get_string(&b, NULL);
452: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
1.8 markus 453: fatal("%s: can not init mac %s", __func__, mac->name);
1.1 provos 454: mac->enabled = buffer_get_int(&b);
455: mac->key = buffer_get_string(&b, &len);
456: if (len > mac->key_len)
1.12 deraadt 457: fatal("%s: bad mac key length: %u > %d", __func__, len,
1.1 provos 458: mac->key_len);
459: mac->key_len = len;
460:
461: /* Comp structure */
462: comp->type = buffer_get_int(&b);
463: comp->enabled = buffer_get_int(&b);
464: comp->name = buffer_get_string(&b, NULL);
465:
466: len = buffer_len(&b);
467: if (len != 0)
1.12 deraadt 468: error("newkeys_from_blob: remaining bytes in blob %u", len);
1.1 provos 469: buffer_free(&b);
470: return (newkey);
471: }
472:
473: int
474: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
475: {
476: Buffer b;
477: int len;
478: Enc *enc;
479: Mac *mac;
480: Comp *comp;
481: Newkeys *newkey = newkeys[mode];
482:
1.8 markus 483: debug3("%s: converting %p", __func__, newkey);
1.1 provos 484:
485: if (newkey == NULL) {
1.8 markus 486: error("%s: newkey == NULL", __func__);
1.1 provos 487: return 0;
488: }
489: enc = &newkey->enc;
490: mac = &newkey->mac;
491: comp = &newkey->comp;
492:
493: buffer_init(&b);
494: /* Enc structure */
495: buffer_put_cstring(&b, enc->name);
496: /* The cipher struct is constant and shared, you export pointer */
497: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
498: buffer_put_int(&b, enc->enabled);
499: buffer_put_int(&b, enc->block_size);
500: buffer_put_string(&b, enc->key, enc->key_len);
501: packet_get_keyiv(mode, enc->iv, enc->block_size);
502: buffer_put_string(&b, enc->iv, enc->block_size);
503:
504: /* Mac structure */
505: buffer_put_cstring(&b, mac->name);
506: buffer_put_int(&b, mac->enabled);
507: buffer_put_string(&b, mac->key, mac->key_len);
508:
509: /* Comp structure */
510: buffer_put_int(&b, comp->type);
511: buffer_put_int(&b, comp->enabled);
512: buffer_put_cstring(&b, comp->name);
513:
514: len = buffer_len(&b);
1.16 markus 515: if (lenp != NULL)
516: *lenp = len;
517: if (blobp != NULL) {
518: *blobp = xmalloc(len);
519: memcpy(*blobp, buffer_ptr(&b), len);
520: }
1.1 provos 521: memset(buffer_ptr(&b), 0, len);
522: buffer_free(&b);
523: return len;
524: }
525:
1.2 markus 526: static void
1.1 provos 527: mm_send_kex(Buffer *m, Kex *kex)
528: {
529: buffer_put_string(m, kex->session_id, kex->session_id_len);
530: buffer_put_int(m, kex->we_need);
531: buffer_put_int(m, kex->hostkey_type);
532: buffer_put_int(m, kex->kex_type);
533: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
534: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
535: buffer_put_int(m, kex->flags);
536: buffer_put_cstring(m, kex->client_version_string);
537: buffer_put_cstring(m, kex->server_version_string);
538: }
539:
540: void
1.36 avsm 541: mm_send_keystate(struct monitor *monitor)
1.1 provos 542: {
543: Buffer m;
544: u_char *blob, *p;
545: u_int bloblen, plen;
1.25 markus 546: u_int32_t seqnr, packets;
547: u_int64_t blocks;
1.1 provos 548:
549: buffer_init(&m);
550:
551: if (!compat20) {
552: u_char iv[24];
1.11 markus 553: u_char *key;
554: u_int ivlen, keylen;
1.1 provos 555:
556: buffer_put_int(&m, packet_get_protocol_flags());
557:
558: buffer_put_int(&m, packet_get_ssh1_cipher());
559:
1.11 markus 560: debug3("%s: Sending ssh1 KEY+IV", __func__);
561: keylen = packet_get_encryption_key(NULL);
562: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
563: keylen = packet_get_encryption_key(key);
564: buffer_put_string(&m, key, keylen);
565: memset(key, 0, keylen);
566: xfree(key);
567:
1.1 provos 568: ivlen = packet_get_keyiv_len(MODE_OUT);
569: packet_get_keyiv(MODE_OUT, iv, ivlen);
570: buffer_put_string(&m, iv, ivlen);
571: ivlen = packet_get_keyiv_len(MODE_OUT);
572: packet_get_keyiv(MODE_IN, iv, ivlen);
573: buffer_put_string(&m, iv, ivlen);
574: goto skip;
575: } else {
576: /* Kex for rekeying */
1.36 avsm 577: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 578: }
579:
580: debug3("%s: Sending new keys: %p %p",
1.8 markus 581: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 582:
583: /* Keys from Kex */
584: if (!mm_newkeys_to_blob(MODE_OUT, &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:
590: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 591: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 592:
593: buffer_put_string(&m, blob, bloblen);
594: xfree(blob);
595:
1.25 markus 596: packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
597: buffer_put_int(&m, seqnr);
598: buffer_put_int64(&m, blocks);
599: buffer_put_int(&m, packets);
1.26 markus 600: packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
1.25 markus 601: buffer_put_int(&m, seqnr);
602: buffer_put_int64(&m, blocks);
603: buffer_put_int(&m, packets);
1.1 provos 604:
1.8 markus 605: debug3("%s: New keys have been sent", __func__);
1.1 provos 606: skip:
607: /* More key context */
608: plen = packet_get_keycontext(MODE_OUT, NULL);
609: p = xmalloc(plen+1);
610: packet_get_keycontext(MODE_OUT, p);
611: buffer_put_string(&m, p, plen);
612: xfree(p);
613:
614: plen = packet_get_keycontext(MODE_IN, NULL);
615: p = xmalloc(plen+1);
616: packet_get_keycontext(MODE_IN, p);
617: buffer_put_string(&m, p, plen);
618: xfree(p);
619:
620: /* Compression state */
1.8 markus 621: debug3("%s: Sending compression state", __func__);
1.1 provos 622: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
623: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
624:
625: /* Network I/O buffers */
626: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
627: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
628:
1.36 avsm 629: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 630: debug3("%s: Finished sending state", __func__);
1.1 provos 631:
632: buffer_free(&m);
633: }
634:
635: int
1.42 deraadt 636: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 637: {
638: Buffer m;
1.39 dtucker 639: char *p, *msg;
1.1 provos 640: int success = 0;
641:
642: buffer_init(&m);
1.7 mouring 643: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 644:
1.8 markus 645: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 646: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 647:
648: success = buffer_get_int(&m);
649: if (success == 0) {
1.8 markus 650: debug3("%s: pty alloc failed", __func__);
1.1 provos 651: buffer_free(&m);
652: return (0);
653: }
654: p = buffer_get_string(&m, NULL);
1.39 dtucker 655: msg = buffer_get_string(&m, NULL);
1.1 provos 656: buffer_free(&m);
657:
658: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
659: xfree(p);
1.39 dtucker 660:
661: buffer_append(&loginmsg, msg, strlen(msg));
662: xfree(msg);
1.1 provos 663:
1.7 mouring 664: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
665: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 666:
667: /* Success */
668: return (1);
669: }
670:
671: void
1.32 markus 672: mm_session_pty_cleanup2(Session *s)
1.1 provos 673: {
674: Buffer m;
675:
676: if (s->ttyfd == -1)
677: return;
678: buffer_init(&m);
679: buffer_put_cstring(&m, s->tty);
1.7 mouring 680: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 681: buffer_free(&m);
1.3 markus 682:
1.1 provos 683: /* closed dup'ed master */
684: if (close(s->ptymaster) < 0)
685: error("close(s->ptymaster): %s", strerror(errno));
686:
687: /* unlink pty from session */
688: s->ttyfd = -1;
689: }
690:
691: /* Request process termination */
692:
693: void
694: mm_terminate(void)
695: {
696: Buffer m;
697:
698: buffer_init(&m);
1.7 mouring 699: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 700: buffer_free(&m);
701: }
702:
703: int
704: mm_ssh1_session_key(BIGNUM *num)
705: {
706: int rsafail;
707: Buffer m;
708:
709: buffer_init(&m);
710: buffer_put_bignum2(&m, num);
1.7 mouring 711: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 712:
1.7 mouring 713: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 714:
715: rsafail = buffer_get_int(&m);
716: buffer_get_bignum2(&m, num);
717:
718: buffer_free(&m);
719:
720: return (rsafail);
721: }
722:
1.2 markus 723: static void
1.1 provos 724: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
725: char ***prompts, u_int **echo_on)
726: {
1.10 deraadt 727: *name = xstrdup("");
728: *infotxt = xstrdup("");
1.1 provos 729: *numprompts = 1;
1.43 djm 730: *prompts = xcalloc(*numprompts, sizeof(char *));
731: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 732: (*echo_on)[0] = 0;
733: }
734:
735: int
736: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
737: u_int *numprompts, char ***prompts, u_int **echo_on)
738: {
739: Buffer m;
1.21 markus 740: u_int success;
1.1 provos 741: char *challenge;
742:
1.8 markus 743: debug3("%s: entering", __func__);
1.1 provos 744:
745: buffer_init(&m);
1.7 mouring 746: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 747:
1.7 mouring 748: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 749: &m);
1.21 markus 750: success = buffer_get_int(&m);
751: if (success == 0) {
1.8 markus 752: debug3("%s: no challenge", __func__);
1.1 provos 753: buffer_free(&m);
754: return (-1);
755: }
756:
757: /* Get the challenge, and format the response */
758: challenge = buffer_get_string(&m, NULL);
759: buffer_free(&m);
760:
761: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
762: (*prompts)[0] = challenge;
763:
1.8 markus 764: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 765:
766: return (0);
767: }
768:
769: int
770: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
771: {
772: Buffer m;
773: int authok;
774:
1.8 markus 775: debug3("%s: entering", __func__);
1.1 provos 776: if (numresponses != 1)
777: return (-1);
778:
779: buffer_init(&m);
780: buffer_put_cstring(&m, responses[0]);
1.7 mouring 781: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 782:
1.7 mouring 783: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 784: MONITOR_ANS_BSDAUTHRESPOND, &m);
785:
786: authok = buffer_get_int(&m);
787: buffer_free(&m);
788:
789: return ((authok == 0) ? -1 : 0);
790: }
791:
1.38 dtucker 792: #ifdef SKEY
1.1 provos 793: int
794: mm_skey_query(void *ctx, char **name, char **infotxt,
795: u_int *numprompts, char ***prompts, u_int **echo_on)
796: {
797: Buffer m;
1.21 markus 798: int len;
799: u_int success;
1.1 provos 800: char *p, *challenge;
801:
1.8 markus 802: debug3("%s: entering", __func__);
1.1 provos 803:
804: buffer_init(&m);
1.7 mouring 805: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 806:
1.7 mouring 807: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 808: &m);
1.21 markus 809: success = buffer_get_int(&m);
810: if (success == 0) {
1.8 markus 811: debug3("%s: no challenge", __func__);
1.1 provos 812: buffer_free(&m);
813: return (-1);
814: }
815:
816: /* Get the challenge, and format the response */
817: challenge = buffer_get_string(&m, NULL);
818: buffer_free(&m);
819:
1.8 markus 820: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 821:
822: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
823:
1.43 djm 824: xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1.1 provos 825: xfree(challenge);
826:
827: return (0);
828: }
829:
830: int
831: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
832: {
833: Buffer m;
834: int authok;
835:
1.8 markus 836: debug3("%s: entering", __func__);
1.1 provos 837: if (numresponses != 1)
838: return (-1);
839:
840: buffer_init(&m);
841: buffer_put_cstring(&m, responses[0]);
1.7 mouring 842: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1.1 provos 843:
1.7 mouring 844: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 845: MONITOR_ANS_SKEYRESPOND, &m);
846:
847: authok = buffer_get_int(&m);
848: buffer_free(&m);
849:
850: return ((authok == 0) ? -1 : 0);
851: }
1.38 dtucker 852: #endif /* SKEY */
1.1 provos 853:
854: void
855: mm_ssh1_session_id(u_char session_id[16])
856: {
857: Buffer m;
858: int i;
859:
1.8 markus 860: debug3("%s entering", __func__);
1.1 provos 861:
862: buffer_init(&m);
863: for (i = 0; i < 16; i++)
864: buffer_put_char(&m, session_id[i]);
865:
1.7 mouring 866: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 867: buffer_free(&m);
868: }
869:
870: int
871: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
872: {
873: Buffer m;
874: Key *key;
875: u_char *blob;
876: u_int blen;
1.22 markus 877: int allowed = 0, have_forced = 0;
1.1 provos 878:
1.8 markus 879: debug3("%s entering", __func__);
1.1 provos 880:
881: buffer_init(&m);
882: buffer_put_bignum2(&m, client_n);
883:
1.7 mouring 884: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
885: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 886:
887: allowed = buffer_get_int(&m);
1.22 markus 888:
889: /* fake forced command */
890: auth_clear_options();
891: have_forced = buffer_get_int(&m);
892: forced_command = have_forced ? xstrdup("true") : NULL;
1.1 provos 893:
894: if (allowed && rkey != NULL) {
895: blob = buffer_get_string(&m, &blen);
896: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 897: fatal("%s: key_from_blob failed", __func__);
1.1 provos 898: *rkey = key;
899: xfree(blob);
900: }
901: mm_send_debug(&m);
902: buffer_free(&m);
903:
904: return (allowed);
905: }
906:
907: BIGNUM *
908: mm_auth_rsa_generate_challenge(Key *key)
909: {
910: Buffer m;
911: BIGNUM *challenge;
912: u_char *blob;
913: u_int blen;
914:
1.8 markus 915: debug3("%s entering", __func__);
1.1 provos 916:
917: if ((challenge = BN_new()) == NULL)
1.8 markus 918: fatal("%s: BN_new failed", __func__);
1.1 provos 919:
920: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
921: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 922: fatal("%s: key_to_blob failed", __func__);
1.1 provos 923: key->type = KEY_RSA1;
924:
925: buffer_init(&m);
926: buffer_put_string(&m, blob, blen);
927: xfree(blob);
928:
1.7 mouring 929: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
930: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 931:
932: buffer_get_bignum2(&m, challenge);
933: buffer_free(&m);
934:
935: return (challenge);
936: }
937:
938: int
939: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
940: {
941: Buffer m;
942: u_char *blob;
943: u_int blen;
944: int success = 0;
945:
1.8 markus 946: debug3("%s entering", __func__);
1.1 provos 947:
948: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
949: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 950: fatal("%s: key_to_blob failed", __func__);
1.1 provos 951: key->type = KEY_RSA1;
952:
953: buffer_init(&m);
954: buffer_put_string(&m, blob, blen);
955: buffer_put_string(&m, response, 16);
956: xfree(blob);
957:
1.7 mouring 958: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
959: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 960:
961: success = buffer_get_int(&m);
962: buffer_free(&m);
963:
964: return (success);
965: }
1.29 markus 966:
967: #ifdef GSSAPI
968: OM_uint32
1.36 avsm 969: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 970: {
971: Buffer m;
972: OM_uint32 major;
973:
974: /* Client doesn't get to see the context */
975: *ctx = NULL;
976:
977: buffer_init(&m);
1.36 avsm 978: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 979:
980: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
981: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
982:
983: major = buffer_get_int(&m);
984:
985: buffer_free(&m);
986: return (major);
987: }
988:
989: OM_uint32
990: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
991: gss_buffer_desc *out, OM_uint32 *flags)
992: {
993: Buffer m;
994: OM_uint32 major;
1.30 deraadt 995: u_int len;
1.29 markus 996:
997: buffer_init(&m);
998: buffer_put_string(&m, in->value, in->length);
999:
1000: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1001: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1002:
1003: major = buffer_get_int(&m);
1.30 deraadt 1004: out->value = buffer_get_string(&m, &len);
1005: out->length = len;
1.29 markus 1006: if (flags)
1007: *flags = buffer_get_int(&m);
1008:
1009: buffer_free(&m);
1010:
1011: return (major);
1.35 markus 1012: }
1013:
1014: OM_uint32
1015: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1016: {
1017: Buffer m;
1018: OM_uint32 major;
1019:
1020: buffer_init(&m);
1021: buffer_put_string(&m, gssbuf->value, gssbuf->length);
1022: buffer_put_string(&m, gssmic->value, gssmic->length);
1023:
1024: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1025: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1026: &m);
1027:
1028: major = buffer_get_int(&m);
1029: buffer_free(&m);
1030: return(major);
1.29 markus 1031: }
1032:
1033: int
1034: mm_ssh_gssapi_userok(char *user)
1035: {
1036: Buffer m;
1037: int authenticated = 0;
1038:
1039: buffer_init(&m);
1040:
1041: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1042: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1043: &m);
1044:
1045: authenticated = buffer_get_int(&m);
1046:
1047: buffer_free(&m);
1048: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1049: return (authenticated);
1050: }
1051: #endif /* GSSAPI */
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