Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.39
1.1 provos 1: /*
2: * Copyright 2002 Niels Provos <provos@citi.umich.edu>
3: * Copyright 2002 Markus Friedl <markus@openbsd.org>
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: #include "includes.h"
1.39 ! dtucker 28: RCSID("$OpenBSD: monitor_wrap.c,v 1.38 2004/07/03 11:02:25 dtucker Exp $");
1.1 provos 29:
30: #include <openssl/bn.h>
31: #include <openssl/dh.h>
32:
33: #include "ssh.h"
34: #include "dh.h"
35: #include "kex.h"
36: #include "auth.h"
1.22 markus 37: #include "auth-options.h"
1.1 provos 38: #include "buffer.h"
39: #include "bufaux.h"
40: #include "packet.h"
41: #include "mac.h"
42: #include "log.h"
43: #include "zlib.h"
44: #include "monitor.h"
45: #include "monitor_wrap.h"
46: #include "xmalloc.h"
47: #include "atomicio.h"
48: #include "monitor_fdpass.h"
49: #include "getput.h"
50:
51: #include "auth.h"
52: #include "channels.h"
53: #include "session.h"
54:
1.29 markus 55: #ifdef GSSAPI
56: #include "ssh-gss.h"
57: #endif
58:
1.1 provos 59: /* Imports */
60: extern int compat20;
61: extern Newkeys *newkeys[];
62: extern z_stream incoming_stream;
63: extern z_stream outgoing_stream;
1.7 mouring 64: extern struct monitor *pmonitor;
1.1 provos 65: extern Buffer input, output;
1.39 ! dtucker 66: extern Buffer loginmsg;
1.1 provos 67:
1.32 markus 68: int
69: mm_is_monitor(void)
70: {
71: /*
72: * m_pid is only set in the privileged part, and
73: * points to the unprivileged child.
74: */
1.34 markus 75: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 76: }
77:
1.1 provos 78: void
1.36 avsm 79: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 80: {
1.13 deraadt 81: u_int mlen = buffer_len(m);
1.1 provos 82: u_char buf[5];
83:
1.8 markus 84: debug3("%s entering: type %d", __func__, type);
1.1 provos 85:
86: PUT_32BIT(buf, mlen + 1);
1.10 deraadt 87: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 88: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.8 markus 89: fatal("%s: write", __func__);
1.36 avsm 90: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.8 markus 91: fatal("%s: write", __func__);
1.1 provos 92: }
93:
94: void
1.36 avsm 95: mm_request_receive(int sock, Buffer *m)
1.1 provos 96: {
97: u_char buf[4];
1.13 deraadt 98: u_int msg_len;
1.1 provos 99: ssize_t res;
100:
1.8 markus 101: debug3("%s entering", __func__);
1.1 provos 102:
1.36 avsm 103: res = atomicio(read, sock, buf, sizeof(buf));
1.1 provos 104: if (res != sizeof(buf)) {
105: if (res == 0)
1.32 markus 106: cleanup_exit(255);
1.8 markus 107: fatal("%s: read: %ld", __func__, (long)res);
1.1 provos 108: }
109: msg_len = GET_32BIT(buf);
110: if (msg_len > 256 * 1024)
1.8 markus 111: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 112: buffer_clear(m);
113: buffer_append_space(m, msg_len);
1.36 avsm 114: res = atomicio(read, sock, buffer_ptr(m), msg_len);
1.1 provos 115: if (res != msg_len)
1.8 markus 116: fatal("%s: read: %ld != msg_len", __func__, (long)res);
1.1 provos 117: }
118:
119: void
1.36 avsm 120: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 121: {
122: u_char rtype;
123:
1.8 markus 124: debug3("%s entering: type %d", __func__, type);
1.1 provos 125:
1.36 avsm 126: mm_request_receive(sock, m);
1.1 provos 127: rtype = buffer_get_char(m);
128: if (rtype != type)
1.8 markus 129: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 130: rtype, type);
131: }
132:
133: DH *
134: mm_choose_dh(int min, int nbits, int max)
135: {
136: BIGNUM *p, *g;
137: int success = 0;
138: Buffer m;
139:
140: buffer_init(&m);
141: buffer_put_int(&m, min);
142: buffer_put_int(&m, nbits);
143: buffer_put_int(&m, max);
144:
1.7 mouring 145: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 146:
1.8 markus 147: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 148: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 149:
150: success = buffer_get_char(&m);
151: if (success == 0)
1.8 markus 152: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 153:
154: if ((p = BN_new()) == NULL)
1.8 markus 155: fatal("%s: BN_new failed", __func__);
1.3 markus 156: if ((g = BN_new()) == NULL)
1.8 markus 157: fatal("%s: BN_new failed", __func__);
1.1 provos 158: buffer_get_bignum2(&m, p);
159: buffer_get_bignum2(&m, g);
160:
1.8 markus 161: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 162: buffer_free(&m);
163:
164: return (dh_new_group(g, p));
165: }
166:
167: int
168: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
169: {
1.7 mouring 170: Kex *kex = *pmonitor->m_pkex;
1.1 provos 171: Buffer m;
172:
1.8 markus 173: debug3("%s entering", __func__);
1.1 provos 174:
175: buffer_init(&m);
176: buffer_put_int(&m, kex->host_key_index(key));
177: buffer_put_string(&m, data, datalen);
178:
1.7 mouring 179: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 180:
1.8 markus 181: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 182: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 183: *sigp = buffer_get_string(&m, lenp);
184: buffer_free(&m);
185:
186: return (0);
187: }
188:
189: struct passwd *
1.37 dtucker 190: mm_getpwnamallow(const char *username)
1.1 provos 191: {
192: Buffer m;
193: struct passwd *pw;
194: u_int pwlen;
195:
1.8 markus 196: debug3("%s entering", __func__);
1.1 provos 197:
198: buffer_init(&m);
1.37 dtucker 199: buffer_put_cstring(&m, username);
1.1 provos 200:
1.7 mouring 201: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 202:
1.8 markus 203: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 204: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 205:
206: if (buffer_get_char(&m) == 0) {
207: buffer_free(&m);
208: return (NULL);
209: }
210: pw = buffer_get_string(&m, &pwlen);
211: if (pwlen != sizeof(struct passwd))
1.8 markus 212: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 213: pw->pw_name = buffer_get_string(&m, NULL);
214: pw->pw_passwd = buffer_get_string(&m, NULL);
215: pw->pw_gecos = buffer_get_string(&m, NULL);
216: pw->pw_class = buffer_get_string(&m, NULL);
217: pw->pw_dir = buffer_get_string(&m, NULL);
218: pw->pw_shell = buffer_get_string(&m, NULL);
219: buffer_free(&m);
220:
221: return (pw);
1.6 djm 222: }
223:
1.33 markus 224: char *
225: mm_auth2_read_banner(void)
1.6 djm 226: {
227: Buffer m;
228: char *banner;
229:
1.8 markus 230: debug3("%s entering", __func__);
1.6 djm 231:
232: buffer_init(&m);
1.7 mouring 233: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 234: buffer_clear(&m);
235:
1.33 markus 236: mm_request_receive_expect(pmonitor->m_recvfd,
237: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 238: banner = buffer_get_string(&m, NULL);
239: buffer_free(&m);
1.10 deraadt 240:
1.33 markus 241: /* treat empty banner as missing banner */
242: if (strlen(banner) == 0) {
243: xfree(banner);
244: banner = NULL;
245: }
1.6 djm 246: return (banner);
1.1 provos 247: }
248:
249: /* Inform the privileged process about service and style */
250:
251: void
252: mm_inform_authserv(char *service, char *style)
253: {
254: Buffer m;
255:
1.8 markus 256: debug3("%s entering", __func__);
1.1 provos 257:
258: buffer_init(&m);
259: buffer_put_cstring(&m, service);
260: buffer_put_cstring(&m, style ? style : "");
261:
1.7 mouring 262: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 263:
264: buffer_free(&m);
265: }
266:
267: /* Do the password authentication */
268: int
269: mm_auth_password(Authctxt *authctxt, char *password)
270: {
271: Buffer m;
272: int authenticated = 0;
273:
1.8 markus 274: debug3("%s entering", __func__);
1.1 provos 275:
276: buffer_init(&m);
277: buffer_put_cstring(&m, password);
1.7 mouring 278: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 279:
1.8 markus 280: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 281: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 282:
283: authenticated = buffer_get_int(&m);
284:
285: buffer_free(&m);
286:
1.3 markus 287: debug3("%s: user %sauthenticated",
1.8 markus 288: __func__, authenticated ? "" : "not ");
1.1 provos 289: return (authenticated);
290: }
291:
292: int
293: mm_user_key_allowed(struct passwd *pw, Key *key)
294: {
295: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
296: }
297:
298: int
299: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
300: Key *key)
301: {
302: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
303: }
304:
305: int
306: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
307: char *host, Key *key)
308: {
309: int ret;
310:
311: key->type = KEY_RSA; /* XXX hack for key_to_blob */
312: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
313: key->type = KEY_RSA1;
314: return (ret);
315: }
316:
1.2 markus 317: static void
1.1 provos 318: mm_send_debug(Buffer *m)
319: {
320: char *msg;
321:
322: while (buffer_len(m)) {
323: msg = buffer_get_string(m, NULL);
1.8 markus 324: debug3("%s: Sending debug: %s", __func__, msg);
1.1 provos 325: packet_send_debug("%s", msg);
326: xfree(msg);
327: }
328: }
329:
330: int
331: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
332: {
333: Buffer m;
334: u_char *blob;
335: u_int len;
1.22 markus 336: int allowed = 0, have_forced = 0;
1.1 provos 337:
1.8 markus 338: debug3("%s entering", __func__);
1.1 provos 339:
340: /* Convert the key to a blob and the pass it over */
341: if (!key_to_blob(key, &blob, &len))
342: return (0);
343:
344: buffer_init(&m);
345: buffer_put_int(&m, type);
346: buffer_put_cstring(&m, user ? user : "");
347: buffer_put_cstring(&m, host ? host : "");
348: buffer_put_string(&m, blob, len);
349: xfree(blob);
350:
1.7 mouring 351: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 352:
1.8 markus 353: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 354: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 355:
356: allowed = buffer_get_int(&m);
357:
1.22 markus 358: /* fake forced command */
359: auth_clear_options();
360: have_forced = buffer_get_int(&m);
361: forced_command = have_forced ? xstrdup("true") : NULL;
362:
1.1 provos 363: /* Send potential debug messages */
364: mm_send_debug(&m);
365:
366: buffer_free(&m);
367:
368: return (allowed);
369: }
370:
1.3 markus 371: /*
1.1 provos 372: * This key verify needs to send the key type along, because the
373: * privileged parent makes the decision if the key is allowed
374: * for authentication.
375: */
376:
377: int
378: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
379: {
380: Buffer m;
381: u_char *blob;
382: u_int len;
383: int verified = 0;
384:
1.8 markus 385: debug3("%s entering", __func__);
1.1 provos 386:
387: /* Convert the key to a blob and the pass it over */
388: if (!key_to_blob(key, &blob, &len))
389: return (0);
390:
391: buffer_init(&m);
392: buffer_put_string(&m, blob, len);
393: buffer_put_string(&m, sig, siglen);
394: buffer_put_string(&m, data, datalen);
395: xfree(blob);
396:
1.7 mouring 397: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 398:
1.8 markus 399: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 400: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 401:
402: verified = buffer_get_int(&m);
403:
404: buffer_free(&m);
405:
406: return (verified);
407: }
408:
409: /* Export key state after authentication */
410: Newkeys *
411: mm_newkeys_from_blob(u_char *blob, int blen)
412: {
413: Buffer b;
414: u_int len;
415: Newkeys *newkey = NULL;
416: Enc *enc;
417: Mac *mac;
418: Comp *comp;
419:
1.8 markus 420: debug3("%s: %p(%d)", __func__, blob, blen);
1.1 provos 421: #ifdef DEBUG_PK
422: dump_base64(stderr, blob, blen);
423: #endif
424: buffer_init(&b);
425: buffer_append(&b, blob, blen);
426:
427: newkey = xmalloc(sizeof(*newkey));
428: enc = &newkey->enc;
429: mac = &newkey->mac;
430: comp = &newkey->comp;
431:
432: /* Enc structure */
433: enc->name = buffer_get_string(&b, NULL);
434: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
435: enc->enabled = buffer_get_int(&b);
436: enc->block_size = buffer_get_int(&b);
437: enc->key = buffer_get_string(&b, &enc->key_len);
438: enc->iv = buffer_get_string(&b, &len);
439: if (len != enc->block_size)
1.12 deraadt 440: fatal("%s: bad ivlen: expected %u != %u", __func__,
1.1 provos 441: enc->block_size, len);
442:
443: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
1.8 markus 444: fatal("%s: bad cipher name %s or pointer %p", __func__,
1.1 provos 445: enc->name, enc->cipher);
446:
447: /* Mac structure */
448: mac->name = buffer_get_string(&b, NULL);
449: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
1.8 markus 450: fatal("%s: can not init mac %s", __func__, mac->name);
1.1 provos 451: mac->enabled = buffer_get_int(&b);
452: mac->key = buffer_get_string(&b, &len);
453: if (len > mac->key_len)
1.12 deraadt 454: fatal("%s: bad mac key length: %u > %d", __func__, len,
1.1 provos 455: mac->key_len);
456: mac->key_len = len;
457:
458: /* Comp structure */
459: comp->type = buffer_get_int(&b);
460: comp->enabled = buffer_get_int(&b);
461: comp->name = buffer_get_string(&b, NULL);
462:
463: len = buffer_len(&b);
464: if (len != 0)
1.12 deraadt 465: error("newkeys_from_blob: remaining bytes in blob %u", len);
1.1 provos 466: buffer_free(&b);
467: return (newkey);
468: }
469:
470: int
471: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
472: {
473: Buffer b;
474: int len;
475: Enc *enc;
476: Mac *mac;
477: Comp *comp;
478: Newkeys *newkey = newkeys[mode];
479:
1.8 markus 480: debug3("%s: converting %p", __func__, newkey);
1.1 provos 481:
482: if (newkey == NULL) {
1.8 markus 483: error("%s: newkey == NULL", __func__);
1.1 provos 484: return 0;
485: }
486: enc = &newkey->enc;
487: mac = &newkey->mac;
488: comp = &newkey->comp;
489:
490: buffer_init(&b);
491: /* Enc structure */
492: buffer_put_cstring(&b, enc->name);
493: /* The cipher struct is constant and shared, you export pointer */
494: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
495: buffer_put_int(&b, enc->enabled);
496: buffer_put_int(&b, enc->block_size);
497: buffer_put_string(&b, enc->key, enc->key_len);
498: packet_get_keyiv(mode, enc->iv, enc->block_size);
499: buffer_put_string(&b, enc->iv, enc->block_size);
500:
501: /* Mac structure */
502: buffer_put_cstring(&b, mac->name);
503: buffer_put_int(&b, mac->enabled);
504: buffer_put_string(&b, mac->key, mac->key_len);
505:
506: /* Comp structure */
507: buffer_put_int(&b, comp->type);
508: buffer_put_int(&b, comp->enabled);
509: buffer_put_cstring(&b, comp->name);
510:
511: len = buffer_len(&b);
1.16 markus 512: if (lenp != NULL)
513: *lenp = len;
514: if (blobp != NULL) {
515: *blobp = xmalloc(len);
516: memcpy(*blobp, buffer_ptr(&b), len);
517: }
1.1 provos 518: memset(buffer_ptr(&b), 0, len);
519: buffer_free(&b);
520: return len;
521: }
522:
1.2 markus 523: static void
1.1 provos 524: mm_send_kex(Buffer *m, Kex *kex)
525: {
526: buffer_put_string(m, kex->session_id, kex->session_id_len);
527: buffer_put_int(m, kex->we_need);
528: buffer_put_int(m, kex->hostkey_type);
529: buffer_put_int(m, kex->kex_type);
530: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
531: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
532: buffer_put_int(m, kex->flags);
533: buffer_put_cstring(m, kex->client_version_string);
534: buffer_put_cstring(m, kex->server_version_string);
535: }
536:
537: void
1.36 avsm 538: mm_send_keystate(struct monitor *monitor)
1.1 provos 539: {
540: Buffer m;
541: u_char *blob, *p;
542: u_int bloblen, plen;
1.25 markus 543: u_int32_t seqnr, packets;
544: u_int64_t blocks;
1.1 provos 545:
546: buffer_init(&m);
547:
548: if (!compat20) {
549: u_char iv[24];
1.11 markus 550: u_char *key;
551: u_int ivlen, keylen;
1.1 provos 552:
553: buffer_put_int(&m, packet_get_protocol_flags());
554:
555: buffer_put_int(&m, packet_get_ssh1_cipher());
556:
1.11 markus 557: debug3("%s: Sending ssh1 KEY+IV", __func__);
558: keylen = packet_get_encryption_key(NULL);
559: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
560: keylen = packet_get_encryption_key(key);
561: buffer_put_string(&m, key, keylen);
562: memset(key, 0, keylen);
563: xfree(key);
564:
1.1 provos 565: ivlen = packet_get_keyiv_len(MODE_OUT);
566: packet_get_keyiv(MODE_OUT, iv, ivlen);
567: buffer_put_string(&m, iv, ivlen);
568: ivlen = packet_get_keyiv_len(MODE_OUT);
569: packet_get_keyiv(MODE_IN, iv, ivlen);
570: buffer_put_string(&m, iv, ivlen);
571: goto skip;
572: } else {
573: /* Kex for rekeying */
1.36 avsm 574: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 575: }
576:
577: debug3("%s: Sending new keys: %p %p",
1.8 markus 578: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 579:
580: /* Keys from Kex */
581: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
1.8 markus 582: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 583:
584: buffer_put_string(&m, blob, bloblen);
585: xfree(blob);
586:
587: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 588: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 589:
590: buffer_put_string(&m, blob, bloblen);
591: xfree(blob);
592:
1.25 markus 593: packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
594: buffer_put_int(&m, seqnr);
595: buffer_put_int64(&m, blocks);
596: buffer_put_int(&m, packets);
1.26 markus 597: packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
1.25 markus 598: buffer_put_int(&m, seqnr);
599: buffer_put_int64(&m, blocks);
600: buffer_put_int(&m, packets);
1.1 provos 601:
1.8 markus 602: debug3("%s: New keys have been sent", __func__);
1.1 provos 603: skip:
604: /* More key context */
605: plen = packet_get_keycontext(MODE_OUT, NULL);
606: p = xmalloc(plen+1);
607: packet_get_keycontext(MODE_OUT, p);
608: buffer_put_string(&m, p, plen);
609: xfree(p);
610:
611: plen = packet_get_keycontext(MODE_IN, NULL);
612: p = xmalloc(plen+1);
613: packet_get_keycontext(MODE_IN, p);
614: buffer_put_string(&m, p, plen);
615: xfree(p);
616:
617: /* Compression state */
1.8 markus 618: debug3("%s: Sending compression state", __func__);
1.1 provos 619: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
620: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
621:
622: /* Network I/O buffers */
623: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
624: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
625:
1.36 avsm 626: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 627: debug3("%s: Finished sending state", __func__);
1.1 provos 628:
629: buffer_free(&m);
630: }
631:
632: int
633: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
634: {
635: Buffer m;
1.39 ! dtucker 636: char *p, *msg;
1.1 provos 637: int success = 0;
638:
639: buffer_init(&m);
1.7 mouring 640: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 641:
1.8 markus 642: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 643: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 644:
645: success = buffer_get_int(&m);
646: if (success == 0) {
1.8 markus 647: debug3("%s: pty alloc failed", __func__);
1.1 provos 648: buffer_free(&m);
649: return (0);
650: }
651: p = buffer_get_string(&m, NULL);
1.39 ! dtucker 652: msg = buffer_get_string(&m, NULL);
1.1 provos 653: buffer_free(&m);
654:
655: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
656: xfree(p);
1.39 ! dtucker 657:
! 658: buffer_append(&loginmsg, msg, strlen(msg));
! 659: xfree(msg);
1.1 provos 660:
1.7 mouring 661: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
662: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 663:
664: /* Success */
665: return (1);
666: }
667:
668: void
1.32 markus 669: mm_session_pty_cleanup2(Session *s)
1.1 provos 670: {
671: Buffer m;
672:
673: if (s->ttyfd == -1)
674: return;
675: buffer_init(&m);
676: buffer_put_cstring(&m, s->tty);
1.7 mouring 677: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 678: buffer_free(&m);
1.3 markus 679:
1.1 provos 680: /* closed dup'ed master */
681: if (close(s->ptymaster) < 0)
682: error("close(s->ptymaster): %s", strerror(errno));
683:
684: /* unlink pty from session */
685: s->ttyfd = -1;
686: }
687:
688: /* Request process termination */
689:
690: void
691: mm_terminate(void)
692: {
693: Buffer m;
694:
695: buffer_init(&m);
1.7 mouring 696: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 697: buffer_free(&m);
698: }
699:
700: int
701: mm_ssh1_session_key(BIGNUM *num)
702: {
703: int rsafail;
704: Buffer m;
705:
706: buffer_init(&m);
707: buffer_put_bignum2(&m, num);
1.7 mouring 708: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 709:
1.7 mouring 710: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 711:
712: rsafail = buffer_get_int(&m);
713: buffer_get_bignum2(&m, num);
714:
715: buffer_free(&m);
716:
717: return (rsafail);
718: }
719:
1.2 markus 720: static void
1.1 provos 721: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
722: char ***prompts, u_int **echo_on)
723: {
1.10 deraadt 724: *name = xstrdup("");
725: *infotxt = xstrdup("");
1.1 provos 726: *numprompts = 1;
1.14 deraadt 727: *prompts = xmalloc(*numprompts * sizeof(char *));
1.1 provos 728: *echo_on = xmalloc(*numprompts * sizeof(u_int));
729: (*echo_on)[0] = 0;
730: }
731:
732: int
733: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
734: u_int *numprompts, char ***prompts, u_int **echo_on)
735: {
736: Buffer m;
1.21 markus 737: u_int success;
1.1 provos 738: char *challenge;
739:
1.8 markus 740: debug3("%s: entering", __func__);
1.1 provos 741:
742: buffer_init(&m);
1.7 mouring 743: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 744:
1.7 mouring 745: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 746: &m);
1.21 markus 747: success = buffer_get_int(&m);
748: if (success == 0) {
1.8 markus 749: debug3("%s: no challenge", __func__);
1.1 provos 750: buffer_free(&m);
751: return (-1);
752: }
753:
754: /* Get the challenge, and format the response */
755: challenge = buffer_get_string(&m, NULL);
756: buffer_free(&m);
757:
758: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
759: (*prompts)[0] = challenge;
760:
1.8 markus 761: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 762:
763: return (0);
764: }
765:
766: int
767: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
768: {
769: Buffer m;
770: int authok;
771:
1.8 markus 772: debug3("%s: entering", __func__);
1.1 provos 773: if (numresponses != 1)
774: return (-1);
775:
776: buffer_init(&m);
777: buffer_put_cstring(&m, responses[0]);
1.7 mouring 778: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 779:
1.7 mouring 780: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 781: MONITOR_ANS_BSDAUTHRESPOND, &m);
782:
783: authok = buffer_get_int(&m);
784: buffer_free(&m);
785:
786: return ((authok == 0) ? -1 : 0);
787: }
788:
1.38 dtucker 789: #ifdef SKEY
1.1 provos 790: int
791: mm_skey_query(void *ctx, char **name, char **infotxt,
792: u_int *numprompts, char ***prompts, u_int **echo_on)
793: {
794: Buffer m;
1.21 markus 795: int len;
796: u_int success;
1.1 provos 797: char *p, *challenge;
798:
1.8 markus 799: debug3("%s: entering", __func__);
1.1 provos 800:
801: buffer_init(&m);
1.7 mouring 802: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 803:
1.7 mouring 804: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 805: &m);
1.21 markus 806: success = buffer_get_int(&m);
807: if (success == 0) {
1.8 markus 808: debug3("%s: no challenge", __func__);
1.1 provos 809: buffer_free(&m);
810: return (-1);
811: }
812:
813: /* Get the challenge, and format the response */
814: challenge = buffer_get_string(&m, NULL);
815: buffer_free(&m);
816:
1.8 markus 817: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 818:
819: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
820:
821: len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
822: p = xmalloc(len);
823: strlcpy(p, challenge, len);
824: strlcat(p, SKEY_PROMPT, len);
825: (*prompts)[0] = p;
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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