Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.47
1.47 ! stevesk 1: /* $OpenBSD: monitor_wrap.c,v 1.46 2006/07/06 16:03:53 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:
28: #include "includes.h"
29:
1.46 stevesk 30: #include <sys/types.h>
31:
1.1 provos 32: #include <openssl/bn.h>
33: #include <openssl/dh.h>
1.46 stevesk 34:
1.47 ! stevesk 35: #include <errno.h>
1.46 stevesk 36: #include <pwd.h>
1.1 provos 37:
38: #include "ssh.h"
39: #include "dh.h"
40: #include "kex.h"
41: #include "auth.h"
1.22 markus 42: #include "auth-options.h"
1.1 provos 43: #include "buffer.h"
44: #include "bufaux.h"
45: #include "packet.h"
46: #include "mac.h"
47: #include "log.h"
48: #include "zlib.h"
49: #include "monitor.h"
50: #include "monitor_wrap.h"
51: #include "xmalloc.h"
52: #include "atomicio.h"
53: #include "monitor_fdpass.h"
1.45 djm 54: #include "misc.h"
1.1 provos 55:
56: #include "auth.h"
57: #include "channels.h"
58: #include "session.h"
59:
1.29 markus 60: #ifdef GSSAPI
61: #include "ssh-gss.h"
62: #endif
63:
1.1 provos 64: /* Imports */
65: extern int compat20;
66: extern Newkeys *newkeys[];
67: extern z_stream incoming_stream;
68: extern z_stream outgoing_stream;
1.7 mouring 69: extern struct monitor *pmonitor;
1.1 provos 70: extern Buffer input, output;
1.39 dtucker 71: extern Buffer loginmsg;
1.1 provos 72:
1.32 markus 73: int
74: mm_is_monitor(void)
75: {
76: /*
77: * m_pid is only set in the privileged part, and
78: * points to the unprivileged child.
79: */
1.34 markus 80: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 81: }
82:
1.1 provos 83: void
1.36 avsm 84: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 85: {
1.13 deraadt 86: u_int mlen = buffer_len(m);
1.1 provos 87: u_char buf[5];
88:
1.8 markus 89: debug3("%s entering: type %d", __func__, type);
1.1 provos 90:
1.45 djm 91: put_u32(buf, mlen + 1);
1.10 deraadt 92: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 93: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 94: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 95: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.40 avsm 96: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 97: }
98:
99: void
1.36 avsm 100: mm_request_receive(int sock, Buffer *m)
1.1 provos 101: {
102: u_char buf[4];
1.13 deraadt 103: u_int msg_len;
1.1 provos 104:
1.8 markus 105: debug3("%s entering", __func__);
1.1 provos 106:
1.40 avsm 107: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
108: if (errno == EPIPE)
1.32 markus 109: cleanup_exit(255);
1.40 avsm 110: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 111: }
1.45 djm 112: msg_len = get_u32(buf);
1.1 provos 113: if (msg_len > 256 * 1024)
1.8 markus 114: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 115: buffer_clear(m);
116: buffer_append_space(m, msg_len);
1.40 avsm 117: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
118: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 119: }
120:
121: void
1.36 avsm 122: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 123: {
124: u_char rtype;
125:
1.8 markus 126: debug3("%s entering: type %d", __func__, type);
1.1 provos 127:
1.36 avsm 128: mm_request_receive(sock, m);
1.1 provos 129: rtype = buffer_get_char(m);
130: if (rtype != type)
1.8 markus 131: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 132: rtype, type);
133: }
134:
135: DH *
136: mm_choose_dh(int min, int nbits, int max)
137: {
138: BIGNUM *p, *g;
139: int success = 0;
140: Buffer m;
141:
142: buffer_init(&m);
143: buffer_put_int(&m, min);
144: buffer_put_int(&m, nbits);
145: buffer_put_int(&m, max);
146:
1.7 mouring 147: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 148:
1.8 markus 149: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 150: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 151:
152: success = buffer_get_char(&m);
153: if (success == 0)
1.8 markus 154: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 155:
156: if ((p = BN_new()) == NULL)
1.8 markus 157: fatal("%s: BN_new failed", __func__);
1.3 markus 158: if ((g = BN_new()) == NULL)
1.8 markus 159: fatal("%s: BN_new failed", __func__);
1.1 provos 160: buffer_get_bignum2(&m, p);
161: buffer_get_bignum2(&m, g);
162:
1.8 markus 163: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 164: buffer_free(&m);
165:
166: return (dh_new_group(g, p));
167: }
168:
169: int
170: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
171: {
1.7 mouring 172: Kex *kex = *pmonitor->m_pkex;
1.1 provos 173: Buffer m;
174:
1.8 markus 175: debug3("%s entering", __func__);
1.1 provos 176:
177: buffer_init(&m);
178: buffer_put_int(&m, kex->host_key_index(key));
179: buffer_put_string(&m, data, datalen);
180:
1.7 mouring 181: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 182:
1.8 markus 183: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 184: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 185: *sigp = buffer_get_string(&m, lenp);
186: buffer_free(&m);
187:
188: return (0);
189: }
190:
191: struct passwd *
1.37 dtucker 192: mm_getpwnamallow(const char *username)
1.1 provos 193: {
194: Buffer m;
195: struct passwd *pw;
196: u_int pwlen;
197:
1.8 markus 198: debug3("%s entering", __func__);
1.1 provos 199:
200: buffer_init(&m);
1.37 dtucker 201: buffer_put_cstring(&m, username);
1.1 provos 202:
1.7 mouring 203: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 204:
1.8 markus 205: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 206: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 207:
208: if (buffer_get_char(&m) == 0) {
209: buffer_free(&m);
210: return (NULL);
211: }
212: pw = buffer_get_string(&m, &pwlen);
213: if (pwlen != sizeof(struct passwd))
1.8 markus 214: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 215: pw->pw_name = buffer_get_string(&m, NULL);
216: pw->pw_passwd = buffer_get_string(&m, NULL);
217: pw->pw_gecos = buffer_get_string(&m, NULL);
218: pw->pw_class = buffer_get_string(&m, NULL);
219: pw->pw_dir = buffer_get_string(&m, NULL);
220: pw->pw_shell = buffer_get_string(&m, NULL);
221: buffer_free(&m);
222:
223: return (pw);
1.6 djm 224: }
225:
1.33 markus 226: char *
227: mm_auth2_read_banner(void)
1.6 djm 228: {
229: Buffer m;
230: char *banner;
231:
1.8 markus 232: debug3("%s entering", __func__);
1.6 djm 233:
234: buffer_init(&m);
1.7 mouring 235: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 236: buffer_clear(&m);
237:
1.33 markus 238: mm_request_receive_expect(pmonitor->m_recvfd,
239: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 240: banner = buffer_get_string(&m, NULL);
241: buffer_free(&m);
1.10 deraadt 242:
1.33 markus 243: /* treat empty banner as missing banner */
244: if (strlen(banner) == 0) {
245: xfree(banner);
246: banner = NULL;
247: }
1.6 djm 248: return (banner);
1.1 provos 249: }
250:
251: /* Inform the privileged process about service and style */
252:
253: void
254: mm_inform_authserv(char *service, char *style)
255: {
256: Buffer m;
257:
1.8 markus 258: debug3("%s entering", __func__);
1.1 provos 259:
260: buffer_init(&m);
261: buffer_put_cstring(&m, service);
262: buffer_put_cstring(&m, style ? style : "");
263:
1.7 mouring 264: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 265:
266: buffer_free(&m);
267: }
268:
269: /* Do the password authentication */
270: int
271: mm_auth_password(Authctxt *authctxt, char *password)
272: {
273: Buffer m;
274: int authenticated = 0;
275:
1.8 markus 276: debug3("%s entering", __func__);
1.1 provos 277:
278: buffer_init(&m);
279: buffer_put_cstring(&m, password);
1.7 mouring 280: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 281:
1.8 markus 282: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 283: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 284:
285: authenticated = buffer_get_int(&m);
286:
287: buffer_free(&m);
288:
1.3 markus 289: debug3("%s: user %sauthenticated",
1.8 markus 290: __func__, authenticated ? "" : "not ");
1.1 provos 291: return (authenticated);
292: }
293:
294: int
295: mm_user_key_allowed(struct passwd *pw, Key *key)
296: {
297: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
298: }
299:
300: int
301: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
302: Key *key)
303: {
304: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
305: }
306:
307: int
308: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
309: char *host, Key *key)
310: {
311: int ret;
312:
313: key->type = KEY_RSA; /* XXX hack for key_to_blob */
314: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
315: key->type = KEY_RSA1;
316: return (ret);
317: }
318:
1.2 markus 319: static void
1.1 provos 320: mm_send_debug(Buffer *m)
321: {
322: char *msg;
323:
324: while (buffer_len(m)) {
325: msg = buffer_get_string(m, NULL);
1.8 markus 326: debug3("%s: Sending debug: %s", __func__, msg);
1.1 provos 327: packet_send_debug("%s", msg);
328: xfree(msg);
329: }
330: }
331:
332: int
333: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
334: {
335: Buffer m;
336: u_char *blob;
337: u_int len;
1.22 markus 338: int allowed = 0, have_forced = 0;
1.1 provos 339:
1.8 markus 340: debug3("%s entering", __func__);
1.1 provos 341:
342: /* Convert the key to a blob and the pass it over */
343: if (!key_to_blob(key, &blob, &len))
344: return (0);
345:
346: buffer_init(&m);
347: buffer_put_int(&m, type);
348: buffer_put_cstring(&m, user ? user : "");
349: buffer_put_cstring(&m, host ? host : "");
350: buffer_put_string(&m, blob, len);
351: xfree(blob);
352:
1.7 mouring 353: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 354:
1.8 markus 355: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 356: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 357:
358: allowed = buffer_get_int(&m);
359:
1.22 markus 360: /* fake forced command */
361: auth_clear_options();
362: have_forced = buffer_get_int(&m);
363: forced_command = have_forced ? xstrdup("true") : NULL;
364:
1.1 provos 365: /* Send potential debug messages */
366: mm_send_debug(&m);
367:
368: buffer_free(&m);
369:
370: return (allowed);
371: }
372:
1.3 markus 373: /*
1.1 provos 374: * This key verify needs to send the key type along, because the
375: * privileged parent makes the decision if the key is allowed
376: * for authentication.
377: */
378:
379: int
380: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
381: {
382: Buffer m;
383: u_char *blob;
384: u_int len;
385: int verified = 0;
386:
1.8 markus 387: debug3("%s entering", __func__);
1.1 provos 388:
389: /* Convert the key to a blob and the pass it over */
390: if (!key_to_blob(key, &blob, &len))
391: return (0);
392:
393: buffer_init(&m);
394: buffer_put_string(&m, blob, len);
395: buffer_put_string(&m, sig, siglen);
396: buffer_put_string(&m, data, datalen);
397: xfree(blob);
398:
1.7 mouring 399: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 400:
1.8 markus 401: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 402: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 403:
404: verified = buffer_get_int(&m);
405:
406: buffer_free(&m);
407:
408: return (verified);
409: }
410:
411: /* Export key state after authentication */
412: Newkeys *
413: mm_newkeys_from_blob(u_char *blob, int blen)
414: {
415: Buffer b;
416: u_int len;
417: Newkeys *newkey = NULL;
418: Enc *enc;
419: Mac *mac;
420: Comp *comp;
421:
1.8 markus 422: debug3("%s: %p(%d)", __func__, blob, blen);
1.1 provos 423: #ifdef DEBUG_PK
424: dump_base64(stderr, blob, blen);
425: #endif
426: buffer_init(&b);
427: buffer_append(&b, blob, blen);
428:
429: newkey = xmalloc(sizeof(*newkey));
430: enc = &newkey->enc;
431: mac = &newkey->mac;
432: comp = &newkey->comp;
433:
434: /* Enc structure */
435: enc->name = buffer_get_string(&b, NULL);
436: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
437: enc->enabled = buffer_get_int(&b);
438: enc->block_size = buffer_get_int(&b);
439: enc->key = buffer_get_string(&b, &enc->key_len);
440: enc->iv = buffer_get_string(&b, &len);
441: if (len != enc->block_size)
1.12 deraadt 442: fatal("%s: bad ivlen: expected %u != %u", __func__,
1.1 provos 443: enc->block_size, len);
444:
445: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
1.8 markus 446: fatal("%s: bad cipher name %s or pointer %p", __func__,
1.1 provos 447: enc->name, enc->cipher);
448:
449: /* Mac structure */
450: mac->name = buffer_get_string(&b, NULL);
451: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
1.8 markus 452: fatal("%s: can not init mac %s", __func__, mac->name);
1.1 provos 453: mac->enabled = buffer_get_int(&b);
454: mac->key = buffer_get_string(&b, &len);
455: if (len > mac->key_len)
1.12 deraadt 456: fatal("%s: bad mac key length: %u > %d", __func__, len,
1.1 provos 457: mac->key_len);
458: mac->key_len = len;
459:
460: /* Comp structure */
461: comp->type = buffer_get_int(&b);
462: comp->enabled = buffer_get_int(&b);
463: comp->name = buffer_get_string(&b, NULL);
464:
465: len = buffer_len(&b);
466: if (len != 0)
1.12 deraadt 467: error("newkeys_from_blob: remaining bytes in blob %u", len);
1.1 provos 468: buffer_free(&b);
469: return (newkey);
470: }
471:
472: int
473: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
474: {
475: Buffer b;
476: int len;
477: Enc *enc;
478: Mac *mac;
479: Comp *comp;
480: Newkeys *newkey = newkeys[mode];
481:
1.8 markus 482: debug3("%s: converting %p", __func__, newkey);
1.1 provos 483:
484: if (newkey == NULL) {
1.8 markus 485: error("%s: newkey == NULL", __func__);
1.1 provos 486: return 0;
487: }
488: enc = &newkey->enc;
489: mac = &newkey->mac;
490: comp = &newkey->comp;
491:
492: buffer_init(&b);
493: /* Enc structure */
494: buffer_put_cstring(&b, enc->name);
495: /* The cipher struct is constant and shared, you export pointer */
496: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
497: buffer_put_int(&b, enc->enabled);
498: buffer_put_int(&b, enc->block_size);
499: buffer_put_string(&b, enc->key, enc->key_len);
500: packet_get_keyiv(mode, enc->iv, enc->block_size);
501: buffer_put_string(&b, enc->iv, enc->block_size);
502:
503: /* Mac structure */
504: buffer_put_cstring(&b, mac->name);
505: buffer_put_int(&b, mac->enabled);
506: buffer_put_string(&b, mac->key, mac->key_len);
507:
508: /* Comp structure */
509: buffer_put_int(&b, comp->type);
510: buffer_put_int(&b, comp->enabled);
511: buffer_put_cstring(&b, comp->name);
512:
513: len = buffer_len(&b);
1.16 markus 514: if (lenp != NULL)
515: *lenp = len;
516: if (blobp != NULL) {
517: *blobp = xmalloc(len);
518: memcpy(*blobp, buffer_ptr(&b), len);
519: }
1.1 provos 520: memset(buffer_ptr(&b), 0, len);
521: buffer_free(&b);
522: return len;
523: }
524:
1.2 markus 525: static void
1.1 provos 526: mm_send_kex(Buffer *m, Kex *kex)
527: {
528: buffer_put_string(m, kex->session_id, kex->session_id_len);
529: buffer_put_int(m, kex->we_need);
530: buffer_put_int(m, kex->hostkey_type);
531: buffer_put_int(m, kex->kex_type);
532: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
533: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
534: buffer_put_int(m, kex->flags);
535: buffer_put_cstring(m, kex->client_version_string);
536: buffer_put_cstring(m, kex->server_version_string);
537: }
538:
539: void
1.36 avsm 540: mm_send_keystate(struct monitor *monitor)
1.1 provos 541: {
542: Buffer m;
543: u_char *blob, *p;
544: u_int bloblen, plen;
1.25 markus 545: u_int32_t seqnr, packets;
546: u_int64_t blocks;
1.1 provos 547:
548: buffer_init(&m);
549:
550: if (!compat20) {
551: u_char iv[24];
1.11 markus 552: u_char *key;
553: u_int ivlen, keylen;
1.1 provos 554:
555: buffer_put_int(&m, packet_get_protocol_flags());
556:
557: buffer_put_int(&m, packet_get_ssh1_cipher());
558:
1.11 markus 559: debug3("%s: Sending ssh1 KEY+IV", __func__);
560: keylen = packet_get_encryption_key(NULL);
561: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
562: keylen = packet_get_encryption_key(key);
563: buffer_put_string(&m, key, keylen);
564: memset(key, 0, keylen);
565: xfree(key);
566:
1.1 provos 567: ivlen = packet_get_keyiv_len(MODE_OUT);
568: packet_get_keyiv(MODE_OUT, iv, ivlen);
569: buffer_put_string(&m, iv, ivlen);
570: ivlen = packet_get_keyiv_len(MODE_OUT);
571: packet_get_keyiv(MODE_IN, iv, ivlen);
572: buffer_put_string(&m, iv, ivlen);
573: goto skip;
574: } else {
575: /* Kex for rekeying */
1.36 avsm 576: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 577: }
578:
579: debug3("%s: Sending new keys: %p %p",
1.8 markus 580: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 581:
582: /* Keys from Kex */
583: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
1.8 markus 584: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 585:
586: buffer_put_string(&m, blob, bloblen);
587: xfree(blob);
588:
589: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 590: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 591:
592: buffer_put_string(&m, blob, bloblen);
593: xfree(blob);
594:
1.25 markus 595: packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
596: buffer_put_int(&m, seqnr);
597: buffer_put_int64(&m, blocks);
598: buffer_put_int(&m, packets);
1.26 markus 599: packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
1.25 markus 600: buffer_put_int(&m, seqnr);
601: buffer_put_int64(&m, blocks);
602: buffer_put_int(&m, packets);
1.1 provos 603:
1.8 markus 604: debug3("%s: New keys have been sent", __func__);
1.1 provos 605: skip:
606: /* More key context */
607: plen = packet_get_keycontext(MODE_OUT, NULL);
608: p = xmalloc(plen+1);
609: packet_get_keycontext(MODE_OUT, p);
610: buffer_put_string(&m, p, plen);
611: xfree(p);
612:
613: plen = packet_get_keycontext(MODE_IN, NULL);
614: p = xmalloc(plen+1);
615: packet_get_keycontext(MODE_IN, p);
616: buffer_put_string(&m, p, plen);
617: xfree(p);
618:
619: /* Compression state */
1.8 markus 620: debug3("%s: Sending compression state", __func__);
1.1 provos 621: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
622: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
623:
624: /* Network I/O buffers */
625: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
626: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
627:
1.36 avsm 628: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 629: debug3("%s: Finished sending state", __func__);
1.1 provos 630:
631: buffer_free(&m);
632: }
633:
634: int
1.42 deraadt 635: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 636: {
637: Buffer m;
1.39 dtucker 638: char *p, *msg;
1.1 provos 639: int success = 0;
640:
641: buffer_init(&m);
1.7 mouring 642: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 643:
1.8 markus 644: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 645: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 646:
647: success = buffer_get_int(&m);
648: if (success == 0) {
1.8 markus 649: debug3("%s: pty alloc failed", __func__);
1.1 provos 650: buffer_free(&m);
651: return (0);
652: }
653: p = buffer_get_string(&m, NULL);
1.39 dtucker 654: msg = buffer_get_string(&m, NULL);
1.1 provos 655: buffer_free(&m);
656:
657: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
658: xfree(p);
1.39 dtucker 659:
660: buffer_append(&loginmsg, msg, strlen(msg));
661: xfree(msg);
1.1 provos 662:
1.7 mouring 663: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
664: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 665:
666: /* Success */
667: return (1);
668: }
669:
670: void
1.32 markus 671: mm_session_pty_cleanup2(Session *s)
1.1 provos 672: {
673: Buffer m;
674:
675: if (s->ttyfd == -1)
676: return;
677: buffer_init(&m);
678: buffer_put_cstring(&m, s->tty);
1.7 mouring 679: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 680: buffer_free(&m);
1.3 markus 681:
1.1 provos 682: /* closed dup'ed master */
683: if (close(s->ptymaster) < 0)
684: error("close(s->ptymaster): %s", strerror(errno));
685:
686: /* unlink pty from session */
687: s->ttyfd = -1;
688: }
689:
690: /* Request process termination */
691:
692: void
693: mm_terminate(void)
694: {
695: Buffer m;
696:
697: buffer_init(&m);
1.7 mouring 698: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 699: buffer_free(&m);
700: }
701:
702: int
703: mm_ssh1_session_key(BIGNUM *num)
704: {
705: int rsafail;
706: Buffer m;
707:
708: buffer_init(&m);
709: buffer_put_bignum2(&m, num);
1.7 mouring 710: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 711:
1.7 mouring 712: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 713:
714: rsafail = buffer_get_int(&m);
715: buffer_get_bignum2(&m, num);
716:
717: buffer_free(&m);
718:
719: return (rsafail);
720: }
721:
1.2 markus 722: static void
1.1 provos 723: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
724: char ***prompts, u_int **echo_on)
725: {
1.10 deraadt 726: *name = xstrdup("");
727: *infotxt = xstrdup("");
1.1 provos 728: *numprompts = 1;
1.43 djm 729: *prompts = xcalloc(*numprompts, sizeof(char *));
730: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 731: (*echo_on)[0] = 0;
732: }
733:
734: int
735: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
736: u_int *numprompts, char ***prompts, u_int **echo_on)
737: {
738: Buffer m;
1.21 markus 739: u_int success;
1.1 provos 740: char *challenge;
741:
1.8 markus 742: debug3("%s: entering", __func__);
1.1 provos 743:
744: buffer_init(&m);
1.7 mouring 745: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 746:
1.7 mouring 747: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 748: &m);
1.21 markus 749: success = buffer_get_int(&m);
750: if (success == 0) {
1.8 markus 751: debug3("%s: no challenge", __func__);
1.1 provos 752: buffer_free(&m);
753: return (-1);
754: }
755:
756: /* Get the challenge, and format the response */
757: challenge = buffer_get_string(&m, NULL);
758: buffer_free(&m);
759:
760: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
761: (*prompts)[0] = challenge;
762:
1.8 markus 763: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 764:
765: return (0);
766: }
767:
768: int
769: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
770: {
771: Buffer m;
772: int authok;
773:
1.8 markus 774: debug3("%s: entering", __func__);
1.1 provos 775: if (numresponses != 1)
776: return (-1);
777:
778: buffer_init(&m);
779: buffer_put_cstring(&m, responses[0]);
1.7 mouring 780: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 781:
1.7 mouring 782: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 783: MONITOR_ANS_BSDAUTHRESPOND, &m);
784:
785: authok = buffer_get_int(&m);
786: buffer_free(&m);
787:
788: return ((authok == 0) ? -1 : 0);
789: }
790:
1.38 dtucker 791: #ifdef SKEY
1.1 provos 792: int
793: mm_skey_query(void *ctx, char **name, char **infotxt,
794: u_int *numprompts, char ***prompts, u_int **echo_on)
795: {
796: Buffer m;
1.21 markus 797: int len;
798: u_int success;
1.1 provos 799: char *p, *challenge;
800:
1.8 markus 801: debug3("%s: entering", __func__);
1.1 provos 802:
803: buffer_init(&m);
1.7 mouring 804: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 805:
1.7 mouring 806: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 807: &m);
1.21 markus 808: success = buffer_get_int(&m);
809: if (success == 0) {
1.8 markus 810: debug3("%s: no challenge", __func__);
1.1 provos 811: buffer_free(&m);
812: return (-1);
813: }
814:
815: /* Get the challenge, and format the response */
816: challenge = buffer_get_string(&m, NULL);
817: buffer_free(&m);
818:
1.8 markus 819: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 820:
821: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
822:
1.43 djm 823: xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1.1 provos 824: xfree(challenge);
825:
826: return (0);
827: }
828:
829: int
830: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
831: {
832: Buffer m;
833: int authok;
834:
1.8 markus 835: debug3("%s: entering", __func__);
1.1 provos 836: if (numresponses != 1)
837: return (-1);
838:
839: buffer_init(&m);
840: buffer_put_cstring(&m, responses[0]);
1.7 mouring 841: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1.1 provos 842:
1.7 mouring 843: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 844: MONITOR_ANS_SKEYRESPOND, &m);
845:
846: authok = buffer_get_int(&m);
847: buffer_free(&m);
848:
849: return ((authok == 0) ? -1 : 0);
850: }
1.38 dtucker 851: #endif /* SKEY */
1.1 provos 852:
853: void
854: mm_ssh1_session_id(u_char session_id[16])
855: {
856: Buffer m;
857: int i;
858:
1.8 markus 859: debug3("%s entering", __func__);
1.1 provos 860:
861: buffer_init(&m);
862: for (i = 0; i < 16; i++)
863: buffer_put_char(&m, session_id[i]);
864:
1.7 mouring 865: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 866: buffer_free(&m);
867: }
868:
869: int
870: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
871: {
872: Buffer m;
873: Key *key;
874: u_char *blob;
875: u_int blen;
1.22 markus 876: int allowed = 0, have_forced = 0;
1.1 provos 877:
1.8 markus 878: debug3("%s entering", __func__);
1.1 provos 879:
880: buffer_init(&m);
881: buffer_put_bignum2(&m, client_n);
882:
1.7 mouring 883: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
884: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 885:
886: allowed = buffer_get_int(&m);
1.22 markus 887:
888: /* fake forced command */
889: auth_clear_options();
890: have_forced = buffer_get_int(&m);
891: forced_command = have_forced ? xstrdup("true") : NULL;
1.1 provos 892:
893: if (allowed && rkey != NULL) {
894: blob = buffer_get_string(&m, &blen);
895: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 896: fatal("%s: key_from_blob failed", __func__);
1.1 provos 897: *rkey = key;
898: xfree(blob);
899: }
900: mm_send_debug(&m);
901: buffer_free(&m);
902:
903: return (allowed);
904: }
905:
906: BIGNUM *
907: mm_auth_rsa_generate_challenge(Key *key)
908: {
909: Buffer m;
910: BIGNUM *challenge;
911: u_char *blob;
912: u_int blen;
913:
1.8 markus 914: debug3("%s entering", __func__);
1.1 provos 915:
916: if ((challenge = BN_new()) == NULL)
1.8 markus 917: fatal("%s: BN_new failed", __func__);
1.1 provos 918:
919: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
920: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 921: fatal("%s: key_to_blob failed", __func__);
1.1 provos 922: key->type = KEY_RSA1;
923:
924: buffer_init(&m);
925: buffer_put_string(&m, blob, blen);
926: xfree(blob);
927:
1.7 mouring 928: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
929: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 930:
931: buffer_get_bignum2(&m, challenge);
932: buffer_free(&m);
933:
934: return (challenge);
935: }
936:
937: int
938: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
939: {
940: Buffer m;
941: u_char *blob;
942: u_int blen;
943: int success = 0;
944:
1.8 markus 945: debug3("%s entering", __func__);
1.1 provos 946:
947: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
948: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 949: fatal("%s: key_to_blob failed", __func__);
1.1 provos 950: key->type = KEY_RSA1;
951:
952: buffer_init(&m);
953: buffer_put_string(&m, blob, blen);
954: buffer_put_string(&m, response, 16);
955: xfree(blob);
956:
1.7 mouring 957: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
958: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 959:
960: success = buffer_get_int(&m);
961: buffer_free(&m);
962:
963: return (success);
964: }
1.29 markus 965:
966: #ifdef GSSAPI
967: OM_uint32
1.36 avsm 968: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 969: {
970: Buffer m;
971: OM_uint32 major;
972:
973: /* Client doesn't get to see the context */
974: *ctx = NULL;
975:
976: buffer_init(&m);
1.36 avsm 977: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 978:
979: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
980: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
981:
982: major = buffer_get_int(&m);
983:
984: buffer_free(&m);
985: return (major);
986: }
987:
988: OM_uint32
989: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
990: gss_buffer_desc *out, OM_uint32 *flags)
991: {
992: Buffer m;
993: OM_uint32 major;
1.30 deraadt 994: u_int len;
1.29 markus 995:
996: buffer_init(&m);
997: buffer_put_string(&m, in->value, in->length);
998:
999: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1000: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1001:
1002: major = buffer_get_int(&m);
1.30 deraadt 1003: out->value = buffer_get_string(&m, &len);
1004: out->length = len;
1.29 markus 1005: if (flags)
1006: *flags = buffer_get_int(&m);
1007:
1008: buffer_free(&m);
1009:
1010: return (major);
1.35 markus 1011: }
1012:
1013: OM_uint32
1014: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1015: {
1016: Buffer m;
1017: OM_uint32 major;
1018:
1019: buffer_init(&m);
1020: buffer_put_string(&m, gssbuf->value, gssbuf->length);
1021: buffer_put_string(&m, gssmic->value, gssmic->length);
1022:
1023: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1024: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1025: &m);
1026:
1027: major = buffer_get_int(&m);
1028: buffer_free(&m);
1029: return(major);
1.29 markus 1030: }
1031:
1032: int
1033: mm_ssh_gssapi_userok(char *user)
1034: {
1035: Buffer m;
1036: int authenticated = 0;
1037:
1038: buffer_init(&m);
1039:
1040: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1041: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1042: &m);
1043:
1044: authenticated = buffer_get_int(&m);
1045:
1046: buffer_free(&m);
1047: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1048: return (authenticated);
1049: }
1050: #endif /* GSSAPI */
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