Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.40.2.1
1.40.2.1! brad 1: /* $OpenBSD: monitor_wrap.c,v 1.54 2006/08/12 20:46:46 miod 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:
1.40.2.1! brad 28: #include <sys/types.h>
! 29: #include <sys/uio.h>
1.1 provos 30:
31: #include <openssl/bn.h>
32: #include <openssl/dh.h>
33:
1.40.2.1! brad 34: #include <errno.h>
! 35: #include <pwd.h>
! 36: #include <signal.h>
! 37: #include <stdio.h>
! 38: #include <string.h>
! 39: #include <unistd.h>
! 40:
! 41: #include "xmalloc.h"
1.1 provos 42: #include "ssh.h"
43: #include "dh.h"
1.40.2.1! brad 44: #include "buffer.h"
! 45: #include "key.h"
! 46: #include "cipher.h"
1.1 provos 47: #include "kex.h"
1.40.2.1! brad 48: #include "hostfile.h"
1.1 provos 49: #include "auth.h"
1.22 markus 50: #include "auth-options.h"
1.1 provos 51: #include "packet.h"
52: #include "mac.h"
53: #include "log.h"
1.40.2.1! brad 54: #include <zlib.h>
1.1 provos 55: #include "monitor.h"
1.40.2.1! brad 56: #ifdef GSSAPI
! 57: #include "ssh-gss.h"
! 58: #endif
1.1 provos 59: #include "monitor_wrap.h"
60: #include "atomicio.h"
61: #include "monitor_fdpass.h"
1.40.2.1! brad 62: #include "misc.h"
1.1 provos 63:
64: #include "channels.h"
65: #include "session.h"
66:
67: /* Imports */
68: extern int compat20;
69: extern Newkeys *newkeys[];
70: extern z_stream incoming_stream;
71: extern z_stream outgoing_stream;
1.7 mouring 72: extern struct monitor *pmonitor;
1.1 provos 73: extern Buffer input, output;
1.39 dtucker 74: extern Buffer loginmsg;
1.1 provos 75:
1.32 markus 76: int
77: mm_is_monitor(void)
78: {
79: /*
80: * m_pid is only set in the privileged part, and
81: * points to the unprivileged child.
82: */
1.34 markus 83: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 84: }
85:
1.1 provos 86: void
1.36 avsm 87: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 88: {
1.13 deraadt 89: u_int mlen = buffer_len(m);
1.1 provos 90: u_char buf[5];
91:
1.8 markus 92: debug3("%s entering: type %d", __func__, type);
1.1 provos 93:
1.40.2.1! brad 94: put_u32(buf, mlen + 1);
1.10 deraadt 95: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 96: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 97: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 98: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.40 avsm 99: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 100: }
101:
102: void
1.36 avsm 103: mm_request_receive(int sock, Buffer *m)
1.1 provos 104: {
105: u_char buf[4];
1.13 deraadt 106: u_int msg_len;
1.1 provos 107:
1.8 markus 108: debug3("%s entering", __func__);
1.1 provos 109:
1.40 avsm 110: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
111: if (errno == EPIPE)
1.32 markus 112: cleanup_exit(255);
1.40 avsm 113: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 114: }
1.40.2.1! brad 115: msg_len = get_u32(buf);
1.1 provos 116: if (msg_len > 256 * 1024)
1.8 markus 117: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 118: buffer_clear(m);
119: buffer_append_space(m, msg_len);
1.40 avsm 120: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
121: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 122: }
123:
124: void
1.36 avsm 125: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 126: {
127: u_char rtype;
128:
1.8 markus 129: debug3("%s entering: type %d", __func__, type);
1.1 provos 130:
1.36 avsm 131: mm_request_receive(sock, m);
1.1 provos 132: rtype = buffer_get_char(m);
133: if (rtype != type)
1.8 markus 134: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 135: rtype, type);
136: }
137:
138: DH *
139: mm_choose_dh(int min, int nbits, int max)
140: {
141: BIGNUM *p, *g;
142: int success = 0;
143: Buffer m;
144:
145: buffer_init(&m);
146: buffer_put_int(&m, min);
147: buffer_put_int(&m, nbits);
148: buffer_put_int(&m, max);
149:
1.7 mouring 150: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 151:
1.8 markus 152: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 153: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 154:
155: success = buffer_get_char(&m);
156: if (success == 0)
1.8 markus 157: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 158:
159: if ((p = BN_new()) == NULL)
1.8 markus 160: fatal("%s: BN_new failed", __func__);
1.3 markus 161: if ((g = BN_new()) == NULL)
1.8 markus 162: fatal("%s: BN_new failed", __func__);
1.1 provos 163: buffer_get_bignum2(&m, p);
164: buffer_get_bignum2(&m, g);
165:
1.8 markus 166: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 167: buffer_free(&m);
168:
169: return (dh_new_group(g, p));
170: }
171:
172: int
173: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
174: {
1.7 mouring 175: Kex *kex = *pmonitor->m_pkex;
1.1 provos 176: Buffer m;
177:
1.8 markus 178: debug3("%s entering", __func__);
1.1 provos 179:
180: buffer_init(&m);
181: buffer_put_int(&m, kex->host_key_index(key));
182: buffer_put_string(&m, data, datalen);
183:
1.7 mouring 184: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 185:
1.8 markus 186: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 187: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 188: *sigp = buffer_get_string(&m, lenp);
189: buffer_free(&m);
190:
191: return (0);
192: }
193:
194: struct passwd *
1.37 dtucker 195: mm_getpwnamallow(const char *username)
1.1 provos 196: {
197: Buffer m;
198: struct passwd *pw;
199: u_int pwlen;
200:
1.8 markus 201: debug3("%s entering", __func__);
1.1 provos 202:
203: buffer_init(&m);
1.37 dtucker 204: buffer_put_cstring(&m, username);
1.1 provos 205:
1.7 mouring 206: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 207:
1.8 markus 208: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 209: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 210:
211: if (buffer_get_char(&m) == 0) {
212: buffer_free(&m);
213: return (NULL);
214: }
215: pw = buffer_get_string(&m, &pwlen);
216: if (pwlen != sizeof(struct passwd))
1.8 markus 217: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 218: pw->pw_name = buffer_get_string(&m, NULL);
219: pw->pw_passwd = buffer_get_string(&m, NULL);
220: pw->pw_gecos = buffer_get_string(&m, NULL);
221: pw->pw_class = buffer_get_string(&m, NULL);
222: pw->pw_dir = buffer_get_string(&m, NULL);
223: pw->pw_shell = buffer_get_string(&m, NULL);
224: buffer_free(&m);
225:
226: return (pw);
1.6 djm 227: }
228:
1.33 markus 229: char *
230: mm_auth2_read_banner(void)
1.6 djm 231: {
232: Buffer m;
233: char *banner;
234:
1.8 markus 235: debug3("%s entering", __func__);
1.6 djm 236:
237: buffer_init(&m);
1.7 mouring 238: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 239: buffer_clear(&m);
240:
1.33 markus 241: mm_request_receive_expect(pmonitor->m_recvfd,
242: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 243: banner = buffer_get_string(&m, NULL);
244: buffer_free(&m);
1.10 deraadt 245:
1.33 markus 246: /* treat empty banner as missing banner */
247: if (strlen(banner) == 0) {
248: xfree(banner);
249: banner = NULL;
250: }
1.6 djm 251: return (banner);
1.1 provos 252: }
253:
254: /* Inform the privileged process about service and style */
255:
256: void
257: mm_inform_authserv(char *service, char *style)
258: {
259: Buffer m;
260:
1.8 markus 261: debug3("%s entering", __func__);
1.1 provos 262:
263: buffer_init(&m);
264: buffer_put_cstring(&m, service);
265: buffer_put_cstring(&m, style ? style : "");
266:
1.7 mouring 267: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 268:
269: buffer_free(&m);
270: }
271:
272: /* Do the password authentication */
273: int
274: mm_auth_password(Authctxt *authctxt, char *password)
275: {
276: Buffer m;
277: int authenticated = 0;
278:
1.8 markus 279: debug3("%s entering", __func__);
1.1 provos 280:
281: buffer_init(&m);
282: buffer_put_cstring(&m, password);
1.7 mouring 283: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 284:
1.8 markus 285: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 286: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 287:
288: authenticated = buffer_get_int(&m);
289:
290: buffer_free(&m);
291:
1.3 markus 292: debug3("%s: user %sauthenticated",
1.8 markus 293: __func__, authenticated ? "" : "not ");
1.1 provos 294: return (authenticated);
295: }
296:
297: int
298: mm_user_key_allowed(struct passwd *pw, Key *key)
299: {
300: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
301: }
302:
303: int
304: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
305: Key *key)
306: {
307: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
308: }
309:
310: int
311: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
312: char *host, Key *key)
313: {
314: int ret;
315:
316: key->type = KEY_RSA; /* XXX hack for key_to_blob */
317: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
318: key->type = KEY_RSA1;
319: return (ret);
320: }
321:
1.2 markus 322: static void
1.1 provos 323: mm_send_debug(Buffer *m)
324: {
325: char *msg;
326:
327: while (buffer_len(m)) {
328: msg = buffer_get_string(m, NULL);
1.8 markus 329: debug3("%s: Sending debug: %s", __func__, msg);
1.1 provos 330: packet_send_debug("%s", msg);
331: xfree(msg);
332: }
333: }
334:
335: int
336: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
337: {
338: Buffer m;
339: u_char *blob;
340: u_int len;
1.22 markus 341: int allowed = 0, have_forced = 0;
1.1 provos 342:
1.8 markus 343: debug3("%s entering", __func__);
1.1 provos 344:
345: /* Convert the key to a blob and the pass it over */
346: if (!key_to_blob(key, &blob, &len))
347: return (0);
348:
349: buffer_init(&m);
350: buffer_put_int(&m, type);
351: buffer_put_cstring(&m, user ? user : "");
352: buffer_put_cstring(&m, host ? host : "");
353: buffer_put_string(&m, blob, len);
354: xfree(blob);
355:
1.7 mouring 356: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 357:
1.8 markus 358: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 359: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 360:
361: allowed = buffer_get_int(&m);
362:
1.22 markus 363: /* fake forced command */
364: auth_clear_options();
365: have_forced = buffer_get_int(&m);
366: forced_command = have_forced ? xstrdup("true") : NULL;
367:
1.1 provos 368: /* Send potential debug messages */
369: mm_send_debug(&m);
370:
371: buffer_free(&m);
372:
373: return (allowed);
374: }
375:
1.3 markus 376: /*
1.1 provos 377: * This key verify needs to send the key type along, because the
378: * privileged parent makes the decision if the key is allowed
379: * for authentication.
380: */
381:
382: int
383: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
384: {
385: Buffer m;
386: u_char *blob;
387: u_int len;
388: int verified = 0;
389:
1.8 markus 390: debug3("%s entering", __func__);
1.1 provos 391:
392: /* Convert the key to a blob and the pass it over */
393: if (!key_to_blob(key, &blob, &len))
394: return (0);
395:
396: buffer_init(&m);
397: buffer_put_string(&m, blob, len);
398: buffer_put_string(&m, sig, siglen);
399: buffer_put_string(&m, data, datalen);
400: xfree(blob);
401:
1.7 mouring 402: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 403:
1.8 markus 404: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 405: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 406:
407: verified = buffer_get_int(&m);
408:
409: buffer_free(&m);
410:
411: return (verified);
412: }
413:
414: /* Export key state after authentication */
415: Newkeys *
416: mm_newkeys_from_blob(u_char *blob, int blen)
417: {
418: Buffer b;
419: u_int len;
420: Newkeys *newkey = NULL;
421: Enc *enc;
422: Mac *mac;
423: Comp *comp;
424:
1.8 markus 425: debug3("%s: %p(%d)", __func__, blob, blen);
1.1 provos 426: #ifdef DEBUG_PK
427: dump_base64(stderr, blob, blen);
428: #endif
429: buffer_init(&b);
430: buffer_append(&b, blob, blen);
431:
432: newkey = xmalloc(sizeof(*newkey));
433: enc = &newkey->enc;
434: mac = &newkey->mac;
435: comp = &newkey->comp;
436:
437: /* Enc structure */
438: enc->name = buffer_get_string(&b, NULL);
439: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
440: enc->enabled = buffer_get_int(&b);
441: enc->block_size = buffer_get_int(&b);
442: enc->key = buffer_get_string(&b, &enc->key_len);
443: enc->iv = buffer_get_string(&b, &len);
444: if (len != enc->block_size)
1.12 deraadt 445: fatal("%s: bad ivlen: expected %u != %u", __func__,
1.1 provos 446: enc->block_size, len);
447:
448: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
1.8 markus 449: fatal("%s: bad cipher name %s or pointer %p", __func__,
1.1 provos 450: enc->name, enc->cipher);
451:
452: /* Mac structure */
453: mac->name = buffer_get_string(&b, NULL);
454: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
1.8 markus 455: fatal("%s: can not init mac %s", __func__, mac->name);
1.1 provos 456: mac->enabled = buffer_get_int(&b);
457: mac->key = buffer_get_string(&b, &len);
458: if (len > mac->key_len)
1.12 deraadt 459: fatal("%s: bad mac key length: %u > %d", __func__, len,
1.1 provos 460: mac->key_len);
461: mac->key_len = len;
462:
463: /* Comp structure */
464: comp->type = buffer_get_int(&b);
465: comp->enabled = buffer_get_int(&b);
466: comp->name = buffer_get_string(&b, NULL);
467:
468: len = buffer_len(&b);
469: if (len != 0)
1.12 deraadt 470: error("newkeys_from_blob: remaining bytes in blob %u", len);
1.1 provos 471: buffer_free(&b);
472: return (newkey);
473: }
474:
475: int
476: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
477: {
478: Buffer b;
479: int len;
480: Enc *enc;
481: Mac *mac;
482: Comp *comp;
483: Newkeys *newkey = newkeys[mode];
484:
1.8 markus 485: debug3("%s: converting %p", __func__, newkey);
1.1 provos 486:
487: if (newkey == NULL) {
1.8 markus 488: error("%s: newkey == NULL", __func__);
1.1 provos 489: return 0;
490: }
491: enc = &newkey->enc;
492: mac = &newkey->mac;
493: comp = &newkey->comp;
494:
495: buffer_init(&b);
496: /* Enc structure */
497: buffer_put_cstring(&b, enc->name);
498: /* The cipher struct is constant and shared, you export pointer */
499: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
500: buffer_put_int(&b, enc->enabled);
501: buffer_put_int(&b, enc->block_size);
502: buffer_put_string(&b, enc->key, enc->key_len);
503: packet_get_keyiv(mode, enc->iv, enc->block_size);
504: buffer_put_string(&b, enc->iv, enc->block_size);
505:
506: /* Mac structure */
507: buffer_put_cstring(&b, mac->name);
508: buffer_put_int(&b, mac->enabled);
509: buffer_put_string(&b, mac->key, mac->key_len);
510:
511: /* Comp structure */
512: buffer_put_int(&b, comp->type);
513: buffer_put_int(&b, comp->enabled);
514: buffer_put_cstring(&b, comp->name);
515:
516: len = buffer_len(&b);
1.16 markus 517: if (lenp != NULL)
518: *lenp = len;
519: if (blobp != NULL) {
520: *blobp = xmalloc(len);
521: memcpy(*blobp, buffer_ptr(&b), len);
522: }
1.1 provos 523: memset(buffer_ptr(&b), 0, len);
524: buffer_free(&b);
525: return len;
526: }
527:
1.2 markus 528: static void
1.1 provos 529: mm_send_kex(Buffer *m, Kex *kex)
530: {
531: buffer_put_string(m, kex->session_id, kex->session_id_len);
532: buffer_put_int(m, kex->we_need);
533: buffer_put_int(m, kex->hostkey_type);
534: buffer_put_int(m, kex->kex_type);
535: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
536: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
537: buffer_put_int(m, kex->flags);
538: buffer_put_cstring(m, kex->client_version_string);
539: buffer_put_cstring(m, kex->server_version_string);
540: }
541:
542: void
1.36 avsm 543: mm_send_keystate(struct monitor *monitor)
1.1 provos 544: {
545: Buffer m;
546: u_char *blob, *p;
547: u_int bloblen, plen;
1.25 markus 548: u_int32_t seqnr, packets;
549: u_int64_t blocks;
1.1 provos 550:
551: buffer_init(&m);
552:
553: if (!compat20) {
554: u_char iv[24];
1.11 markus 555: u_char *key;
556: u_int ivlen, keylen;
1.1 provos 557:
558: buffer_put_int(&m, packet_get_protocol_flags());
559:
560: buffer_put_int(&m, packet_get_ssh1_cipher());
561:
1.11 markus 562: debug3("%s: Sending ssh1 KEY+IV", __func__);
563: keylen = packet_get_encryption_key(NULL);
564: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
565: keylen = packet_get_encryption_key(key);
566: buffer_put_string(&m, key, keylen);
567: memset(key, 0, keylen);
568: xfree(key);
569:
1.1 provos 570: ivlen = packet_get_keyiv_len(MODE_OUT);
571: packet_get_keyiv(MODE_OUT, iv, ivlen);
572: buffer_put_string(&m, iv, ivlen);
573: ivlen = packet_get_keyiv_len(MODE_OUT);
574: packet_get_keyiv(MODE_IN, iv, ivlen);
575: buffer_put_string(&m, iv, ivlen);
576: goto skip;
577: } else {
578: /* Kex for rekeying */
1.36 avsm 579: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 580: }
581:
582: debug3("%s: Sending new keys: %p %p",
1.8 markus 583: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 584:
585: /* Keys from Kex */
586: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
1.8 markus 587: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 588:
589: buffer_put_string(&m, blob, bloblen);
590: xfree(blob);
591:
592: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 593: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 594:
595: buffer_put_string(&m, blob, bloblen);
596: xfree(blob);
597:
1.25 markus 598: packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
599: buffer_put_int(&m, seqnr);
600: buffer_put_int64(&m, blocks);
601: buffer_put_int(&m, packets);
1.26 markus 602: packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
1.25 markus 603: buffer_put_int(&m, seqnr);
604: buffer_put_int64(&m, blocks);
605: buffer_put_int(&m, packets);
1.1 provos 606:
1.8 markus 607: debug3("%s: New keys have been sent", __func__);
1.1 provos 608: skip:
609: /* More key context */
610: plen = packet_get_keycontext(MODE_OUT, NULL);
611: p = xmalloc(plen+1);
612: packet_get_keycontext(MODE_OUT, p);
613: buffer_put_string(&m, p, plen);
614: xfree(p);
615:
616: plen = packet_get_keycontext(MODE_IN, NULL);
617: p = xmalloc(plen+1);
618: packet_get_keycontext(MODE_IN, p);
619: buffer_put_string(&m, p, plen);
620: xfree(p);
621:
622: /* Compression state */
1.8 markus 623: debug3("%s: Sending compression state", __func__);
1.1 provos 624: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
625: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
626:
627: /* Network I/O buffers */
628: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
629: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
630:
1.36 avsm 631: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 632: debug3("%s: Finished sending state", __func__);
1.1 provos 633:
634: buffer_free(&m);
635: }
636:
637: int
1.40.2.1! brad 638: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 639: {
640: Buffer m;
1.39 dtucker 641: char *p, *msg;
1.1 provos 642: int success = 0;
643:
644: buffer_init(&m);
1.7 mouring 645: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 646:
1.8 markus 647: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 648: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 649:
650: success = buffer_get_int(&m);
651: if (success == 0) {
1.8 markus 652: debug3("%s: pty alloc failed", __func__);
1.1 provos 653: buffer_free(&m);
654: return (0);
655: }
656: p = buffer_get_string(&m, NULL);
1.39 dtucker 657: msg = buffer_get_string(&m, NULL);
1.1 provos 658: buffer_free(&m);
659:
660: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
661: xfree(p);
1.39 dtucker 662:
663: buffer_append(&loginmsg, msg, strlen(msg));
664: xfree(msg);
1.1 provos 665:
1.7 mouring 666: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
667: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 668:
669: /* Success */
670: return (1);
671: }
672:
673: void
1.32 markus 674: mm_session_pty_cleanup2(Session *s)
1.1 provos 675: {
676: Buffer m;
677:
678: if (s->ttyfd == -1)
679: return;
680: buffer_init(&m);
681: buffer_put_cstring(&m, s->tty);
1.7 mouring 682: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 683: buffer_free(&m);
1.3 markus 684:
1.1 provos 685: /* closed dup'ed master */
686: if (close(s->ptymaster) < 0)
687: error("close(s->ptymaster): %s", strerror(errno));
688:
689: /* unlink pty from session */
690: s->ttyfd = -1;
691: }
692:
693: /* Request process termination */
694:
695: void
696: mm_terminate(void)
697: {
698: Buffer m;
699:
700: buffer_init(&m);
1.7 mouring 701: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 702: buffer_free(&m);
703: }
704:
705: int
706: mm_ssh1_session_key(BIGNUM *num)
707: {
708: int rsafail;
709: Buffer m;
710:
711: buffer_init(&m);
712: buffer_put_bignum2(&m, num);
1.7 mouring 713: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 714:
1.7 mouring 715: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 716:
717: rsafail = buffer_get_int(&m);
718: buffer_get_bignum2(&m, num);
719:
720: buffer_free(&m);
721:
722: return (rsafail);
723: }
724:
1.2 markus 725: static void
1.1 provos 726: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
727: char ***prompts, u_int **echo_on)
728: {
1.10 deraadt 729: *name = xstrdup("");
730: *infotxt = xstrdup("");
1.1 provos 731: *numprompts = 1;
1.40.2.1! brad 732: *prompts = xcalloc(*numprompts, sizeof(char *));
! 733: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 734: (*echo_on)[0] = 0;
735: }
736:
737: int
738: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
739: u_int *numprompts, char ***prompts, u_int **echo_on)
740: {
741: Buffer m;
1.21 markus 742: u_int success;
1.1 provos 743: char *challenge;
744:
1.8 markus 745: debug3("%s: entering", __func__);
1.1 provos 746:
747: buffer_init(&m);
1.7 mouring 748: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 749:
1.7 mouring 750: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 751: &m);
1.21 markus 752: success = buffer_get_int(&m);
753: if (success == 0) {
1.8 markus 754: debug3("%s: no challenge", __func__);
1.1 provos 755: buffer_free(&m);
756: return (-1);
757: }
758:
759: /* Get the challenge, and format the response */
760: challenge = buffer_get_string(&m, NULL);
761: buffer_free(&m);
762:
763: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
764: (*prompts)[0] = challenge;
765:
1.8 markus 766: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 767:
768: return (0);
769: }
770:
771: int
772: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
773: {
774: Buffer m;
775: int authok;
776:
1.8 markus 777: debug3("%s: entering", __func__);
1.1 provos 778: if (numresponses != 1)
779: return (-1);
780:
781: buffer_init(&m);
782: buffer_put_cstring(&m, responses[0]);
1.7 mouring 783: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 784:
1.7 mouring 785: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 786: MONITOR_ANS_BSDAUTHRESPOND, &m);
787:
788: authok = buffer_get_int(&m);
789: buffer_free(&m);
790:
791: return ((authok == 0) ? -1 : 0);
792: }
793:
1.38 dtucker 794: #ifdef SKEY
1.1 provos 795: int
796: mm_skey_query(void *ctx, char **name, char **infotxt,
797: u_int *numprompts, char ***prompts, u_int **echo_on)
798: {
799: Buffer m;
1.21 markus 800: u_int success;
1.40.2.1! brad 801: char *challenge;
1.1 provos 802:
1.8 markus 803: debug3("%s: entering", __func__);
1.1 provos 804:
805: buffer_init(&m);
1.7 mouring 806: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 807:
1.7 mouring 808: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 809: &m);
1.21 markus 810: success = buffer_get_int(&m);
811: if (success == 0) {
1.8 markus 812: debug3("%s: no challenge", __func__);
1.1 provos 813: buffer_free(&m);
814: return (-1);
815: }
816:
817: /* Get the challenge, and format the response */
818: challenge = buffer_get_string(&m, NULL);
819: buffer_free(&m);
820:
1.8 markus 821: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 822:
823: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
824:
1.40.2.1! brad 825: xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1.1 provos 826: xfree(challenge);
827:
828: return (0);
829: }
830:
831: int
832: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
833: {
834: Buffer m;
835: int authok;
836:
1.8 markus 837: debug3("%s: entering", __func__);
1.1 provos 838: if (numresponses != 1)
839: return (-1);
840:
841: buffer_init(&m);
842: buffer_put_cstring(&m, responses[0]);
1.7 mouring 843: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1.1 provos 844:
1.7 mouring 845: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 846: MONITOR_ANS_SKEYRESPOND, &m);
847:
848: authok = buffer_get_int(&m);
849: buffer_free(&m);
850:
851: return ((authok == 0) ? -1 : 0);
852: }
1.38 dtucker 853: #endif /* SKEY */
1.1 provos 854:
855: void
856: mm_ssh1_session_id(u_char session_id[16])
857: {
858: Buffer m;
859: int i;
860:
1.8 markus 861: debug3("%s entering", __func__);
1.1 provos 862:
863: buffer_init(&m);
864: for (i = 0; i < 16; i++)
865: buffer_put_char(&m, session_id[i]);
866:
1.7 mouring 867: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 868: buffer_free(&m);
869: }
870:
871: int
872: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
873: {
874: Buffer m;
875: Key *key;
876: u_char *blob;
877: u_int blen;
1.22 markus 878: int allowed = 0, have_forced = 0;
1.1 provos 879:
1.8 markus 880: debug3("%s entering", __func__);
1.1 provos 881:
882: buffer_init(&m);
883: buffer_put_bignum2(&m, client_n);
884:
1.7 mouring 885: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
886: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 887:
888: allowed = buffer_get_int(&m);
1.22 markus 889:
890: /* fake forced command */
891: auth_clear_options();
892: have_forced = buffer_get_int(&m);
893: forced_command = have_forced ? xstrdup("true") : NULL;
1.1 provos 894:
895: if (allowed && rkey != NULL) {
896: blob = buffer_get_string(&m, &blen);
897: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 898: fatal("%s: key_from_blob failed", __func__);
1.1 provos 899: *rkey = key;
900: xfree(blob);
901: }
902: mm_send_debug(&m);
903: buffer_free(&m);
904:
905: return (allowed);
906: }
907:
908: BIGNUM *
909: mm_auth_rsa_generate_challenge(Key *key)
910: {
911: Buffer m;
912: BIGNUM *challenge;
913: u_char *blob;
914: u_int blen;
915:
1.8 markus 916: debug3("%s entering", __func__);
1.1 provos 917:
918: if ((challenge = BN_new()) == NULL)
1.8 markus 919: fatal("%s: BN_new failed", __func__);
1.1 provos 920:
921: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
922: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 923: fatal("%s: key_to_blob failed", __func__);
1.1 provos 924: key->type = KEY_RSA1;
925:
926: buffer_init(&m);
927: buffer_put_string(&m, blob, blen);
928: xfree(blob);
929:
1.7 mouring 930: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
931: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 932:
933: buffer_get_bignum2(&m, challenge);
934: buffer_free(&m);
935:
936: return (challenge);
937: }
938:
939: int
940: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
941: {
942: Buffer m;
943: u_char *blob;
944: u_int blen;
945: int success = 0;
946:
1.8 markus 947: debug3("%s entering", __func__);
1.1 provos 948:
949: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
950: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 951: fatal("%s: key_to_blob failed", __func__);
1.1 provos 952: key->type = KEY_RSA1;
953:
954: buffer_init(&m);
955: buffer_put_string(&m, blob, blen);
956: buffer_put_string(&m, response, 16);
957: xfree(blob);
958:
1.7 mouring 959: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
960: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 961:
962: success = buffer_get_int(&m);
963: buffer_free(&m);
964:
965: return (success);
966: }
1.29 markus 967:
968: #ifdef GSSAPI
969: OM_uint32
1.36 avsm 970: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 971: {
972: Buffer m;
973: OM_uint32 major;
974:
975: /* Client doesn't get to see the context */
976: *ctx = NULL;
977:
978: buffer_init(&m);
1.36 avsm 979: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 980:
981: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
982: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
983:
984: major = buffer_get_int(&m);
985:
986: buffer_free(&m);
987: return (major);
988: }
989:
990: OM_uint32
991: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
992: gss_buffer_desc *out, OM_uint32 *flags)
993: {
994: Buffer m;
995: OM_uint32 major;
1.30 deraadt 996: u_int len;
1.29 markus 997:
998: buffer_init(&m);
999: buffer_put_string(&m, in->value, in->length);
1000:
1001: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1002: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1003:
1004: major = buffer_get_int(&m);
1.30 deraadt 1005: out->value = buffer_get_string(&m, &len);
1006: out->length = len;
1.29 markus 1007: if (flags)
1008: *flags = buffer_get_int(&m);
1009:
1010: buffer_free(&m);
1011:
1012: return (major);
1.35 markus 1013: }
1014:
1015: OM_uint32
1016: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1017: {
1018: Buffer m;
1019: OM_uint32 major;
1020:
1021: buffer_init(&m);
1022: buffer_put_string(&m, gssbuf->value, gssbuf->length);
1023: buffer_put_string(&m, gssmic->value, gssmic->length);
1024:
1025: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1026: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1027: &m);
1028:
1029: major = buffer_get_int(&m);
1030: buffer_free(&m);
1031: return(major);
1.29 markus 1032: }
1033:
1034: int
1035: mm_ssh_gssapi_userok(char *user)
1036: {
1037: Buffer m;
1038: int authenticated = 0;
1039:
1040: buffer_init(&m);
1041:
1042: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1043: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1044: &m);
1045:
1046: authenticated = buffer_get_int(&m);
1047:
1048: buffer_free(&m);
1049: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1050: return (authenticated);
1051: }
1052: #endif /* GSSAPI */
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