Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.15
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"
1.15 ! deraadt 28: RCSID("$OpenBSD: monitor_wrap.c,v 1.14 2002/06/30 21:59:45 deraadt 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"
37: #include "buffer.h"
38: #include "bufaux.h"
39: #include "packet.h"
40: #include "mac.h"
41: #include "log.h"
42: #include "zlib.h"
43: #include "monitor.h"
44: #include "monitor_wrap.h"
45: #include "xmalloc.h"
46: #include "atomicio.h"
47: #include "monitor_fdpass.h"
48: #include "getput.h"
49:
50: #include "auth.h"
51: #include "channels.h"
52: #include "session.h"
53:
54: /* Imports */
55: extern int compat20;
56: extern Newkeys *newkeys[];
57: extern z_stream incoming_stream;
58: extern z_stream outgoing_stream;
1.7 mouring 59: extern struct monitor *pmonitor;
1.1 provos 60: extern Buffer input, output;
61:
62: void
63: mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
64: {
1.13 deraadt 65: u_int mlen = buffer_len(m);
1.1 provos 66: u_char buf[5];
67:
1.8 markus 68: debug3("%s entering: type %d", __func__, type);
1.1 provos 69:
70: PUT_32BIT(buf, mlen + 1);
1.10 deraadt 71: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.1 provos 72: if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf))
1.8 markus 73: fatal("%s: write", __func__);
1.1 provos 74: if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
1.8 markus 75: fatal("%s: write", __func__);
1.1 provos 76: }
77:
78: void
79: mm_request_receive(int socket, Buffer *m)
80: {
81: u_char buf[4];
1.13 deraadt 82: u_int msg_len;
1.1 provos 83: ssize_t res;
84:
1.8 markus 85: debug3("%s entering", __func__);
1.1 provos 86:
87: res = atomicio(read, socket, buf, sizeof(buf));
88: if (res != sizeof(buf)) {
89: if (res == 0)
90: fatal_cleanup();
1.8 markus 91: fatal("%s: read: %ld", __func__, (long)res);
1.1 provos 92: }
93: msg_len = GET_32BIT(buf);
94: if (msg_len > 256 * 1024)
1.8 markus 95: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 96: buffer_clear(m);
97: buffer_append_space(m, msg_len);
98: res = atomicio(read, socket, buffer_ptr(m), msg_len);
99: if (res != msg_len)
1.8 markus 100: fatal("%s: read: %ld != msg_len", __func__, (long)res);
1.1 provos 101: }
102:
103: void
104: mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
105: {
106: u_char rtype;
107:
1.8 markus 108: debug3("%s entering: type %d", __func__, type);
1.1 provos 109:
110: mm_request_receive(socket, m);
111: rtype = buffer_get_char(m);
112: if (rtype != type)
1.8 markus 113: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 114: rtype, type);
115: }
116:
117: DH *
118: mm_choose_dh(int min, int nbits, int max)
119: {
120: BIGNUM *p, *g;
121: int success = 0;
122: Buffer m;
123:
124: buffer_init(&m);
125: buffer_put_int(&m, min);
126: buffer_put_int(&m, nbits);
127: buffer_put_int(&m, max);
128:
1.7 mouring 129: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 130:
1.8 markus 131: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 132: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 133:
134: success = buffer_get_char(&m);
135: if (success == 0)
1.8 markus 136: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 137:
138: if ((p = BN_new()) == NULL)
1.8 markus 139: fatal("%s: BN_new failed", __func__);
1.3 markus 140: if ((g = BN_new()) == NULL)
1.8 markus 141: fatal("%s: BN_new failed", __func__);
1.1 provos 142: buffer_get_bignum2(&m, p);
143: buffer_get_bignum2(&m, g);
144:
1.8 markus 145: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 146: buffer_free(&m);
147:
148: return (dh_new_group(g, p));
149: }
150:
151: int
152: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
153: {
1.7 mouring 154: Kex *kex = *pmonitor->m_pkex;
1.1 provos 155: Buffer m;
156:
1.8 markus 157: debug3("%s entering", __func__);
1.1 provos 158:
159: buffer_init(&m);
160: buffer_put_int(&m, kex->host_key_index(key));
161: buffer_put_string(&m, data, datalen);
162:
1.7 mouring 163: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 164:
1.8 markus 165: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 166: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 167: *sigp = buffer_get_string(&m, lenp);
168: buffer_free(&m);
169:
170: return (0);
171: }
172:
173: struct passwd *
174: mm_getpwnamallow(const char *login)
175: {
176: Buffer m;
177: struct passwd *pw;
178: u_int pwlen;
179:
1.8 markus 180: debug3("%s entering", __func__);
1.1 provos 181:
182: buffer_init(&m);
183: buffer_put_cstring(&m, login);
184:
1.7 mouring 185: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 186:
1.8 markus 187: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 188: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 189:
190: if (buffer_get_char(&m) == 0) {
191: buffer_free(&m);
192: return (NULL);
193: }
194: pw = buffer_get_string(&m, &pwlen);
195: if (pwlen != sizeof(struct passwd))
1.8 markus 196: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 197: pw->pw_name = buffer_get_string(&m, NULL);
198: pw->pw_passwd = buffer_get_string(&m, NULL);
199: pw->pw_gecos = buffer_get_string(&m, NULL);
200: pw->pw_class = buffer_get_string(&m, NULL);
201: pw->pw_dir = buffer_get_string(&m, NULL);
202: pw->pw_shell = buffer_get_string(&m, NULL);
203: buffer_free(&m);
204:
205: return (pw);
1.6 djm 206: }
207:
1.14 deraadt 208: char *mm_auth2_read_banner(void)
1.6 djm 209: {
210: Buffer m;
211: char *banner;
212:
1.8 markus 213: debug3("%s entering", __func__);
1.6 djm 214:
215: buffer_init(&m);
1.7 mouring 216: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 217: buffer_clear(&m);
218:
1.7 mouring 219: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 220: banner = buffer_get_string(&m, NULL);
221: buffer_free(&m);
1.10 deraadt 222:
1.6 djm 223: return (banner);
1.1 provos 224: }
225:
226: /* Inform the privileged process about service and style */
227:
228: void
229: mm_inform_authserv(char *service, char *style)
230: {
231: Buffer m;
232:
1.8 markus 233: debug3("%s entering", __func__);
1.1 provos 234:
235: buffer_init(&m);
236: buffer_put_cstring(&m, service);
237: buffer_put_cstring(&m, style ? style : "");
238:
1.7 mouring 239: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 240:
241: buffer_free(&m);
242: }
243:
244: /* Do the password authentication */
245: int
246: mm_auth_password(Authctxt *authctxt, char *password)
247: {
248: Buffer m;
249: int authenticated = 0;
250:
1.8 markus 251: debug3("%s entering", __func__);
1.1 provos 252:
253: buffer_init(&m);
254: buffer_put_cstring(&m, password);
1.7 mouring 255: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 256:
1.8 markus 257: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 258: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 259:
260: authenticated = buffer_get_int(&m);
261:
262: buffer_free(&m);
263:
1.3 markus 264: debug3("%s: user %sauthenticated",
1.8 markus 265: __func__, authenticated ? "" : "not ");
1.1 provos 266: return (authenticated);
267: }
268:
269: int
270: mm_user_key_allowed(struct passwd *pw, Key *key)
271: {
272: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
273: }
274:
275: int
276: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
277: Key *key)
278: {
279: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
280: }
281:
282: int
283: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
284: char *host, Key *key)
285: {
286: int ret;
287:
288: key->type = KEY_RSA; /* XXX hack for key_to_blob */
289: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
290: key->type = KEY_RSA1;
291: return (ret);
292: }
293:
1.2 markus 294: static void
1.1 provos 295: mm_send_debug(Buffer *m)
296: {
297: char *msg;
298:
299: while (buffer_len(m)) {
300: msg = buffer_get_string(m, NULL);
1.8 markus 301: debug3("%s: Sending debug: %s", __func__, msg);
1.1 provos 302: packet_send_debug("%s", msg);
303: xfree(msg);
304: }
305: }
306:
307: int
308: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
309: {
310: Buffer m;
311: u_char *blob;
312: u_int len;
313: int allowed = 0;
314:
1.8 markus 315: debug3("%s entering", __func__);
1.1 provos 316:
317: /* Convert the key to a blob and the pass it over */
318: if (!key_to_blob(key, &blob, &len))
319: return (0);
320:
321: buffer_init(&m);
322: buffer_put_int(&m, type);
323: buffer_put_cstring(&m, user ? user : "");
324: buffer_put_cstring(&m, host ? host : "");
325: buffer_put_string(&m, blob, len);
326: xfree(blob);
327:
1.7 mouring 328: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 329:
1.8 markus 330: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 331: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 332:
333: allowed = buffer_get_int(&m);
334:
335: /* Send potential debug messages */
336: mm_send_debug(&m);
337:
338: buffer_free(&m);
339:
340: return (allowed);
341: }
342:
1.3 markus 343: /*
1.1 provos 344: * This key verify needs to send the key type along, because the
345: * privileged parent makes the decision if the key is allowed
346: * for authentication.
347: */
348:
349: int
350: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
351: {
352: Buffer m;
353: u_char *blob;
354: u_int len;
355: int verified = 0;
356:
1.8 markus 357: debug3("%s entering", __func__);
1.1 provos 358:
359: /* Convert the key to a blob and the pass it over */
360: if (!key_to_blob(key, &blob, &len))
361: return (0);
362:
363: buffer_init(&m);
364: buffer_put_string(&m, blob, len);
365: buffer_put_string(&m, sig, siglen);
366: buffer_put_string(&m, data, datalen);
367: xfree(blob);
368:
1.7 mouring 369: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 370:
1.8 markus 371: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 372: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 373:
374: verified = buffer_get_int(&m);
375:
376: buffer_free(&m);
377:
378: return (verified);
379: }
380:
381: /* Export key state after authentication */
382: Newkeys *
383: mm_newkeys_from_blob(u_char *blob, int blen)
384: {
385: Buffer b;
386: u_int len;
387: Newkeys *newkey = NULL;
388: Enc *enc;
389: Mac *mac;
390: Comp *comp;
391:
1.8 markus 392: debug3("%s: %p(%d)", __func__, blob, blen);
1.1 provos 393: #ifdef DEBUG_PK
394: dump_base64(stderr, blob, blen);
395: #endif
396: buffer_init(&b);
397: buffer_append(&b, blob, blen);
398:
399: newkey = xmalloc(sizeof(*newkey));
400: enc = &newkey->enc;
401: mac = &newkey->mac;
402: comp = &newkey->comp;
403:
404: /* Enc structure */
405: enc->name = buffer_get_string(&b, NULL);
406: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
407: enc->enabled = buffer_get_int(&b);
408: enc->block_size = buffer_get_int(&b);
409: enc->key = buffer_get_string(&b, &enc->key_len);
410: enc->iv = buffer_get_string(&b, &len);
411: if (len != enc->block_size)
1.12 deraadt 412: fatal("%s: bad ivlen: expected %u != %u", __func__,
1.1 provos 413: enc->block_size, len);
414:
415: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
1.8 markus 416: fatal("%s: bad cipher name %s or pointer %p", __func__,
1.1 provos 417: enc->name, enc->cipher);
418:
419: /* Mac structure */
420: mac->name = buffer_get_string(&b, NULL);
421: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
1.8 markus 422: fatal("%s: can not init mac %s", __func__, mac->name);
1.1 provos 423: mac->enabled = buffer_get_int(&b);
424: mac->key = buffer_get_string(&b, &len);
425: if (len > mac->key_len)
1.12 deraadt 426: fatal("%s: bad mac key length: %u > %d", __func__, len,
1.1 provos 427: mac->key_len);
428: mac->key_len = len;
429:
430: /* Comp structure */
431: comp->type = buffer_get_int(&b);
432: comp->enabled = buffer_get_int(&b);
433: comp->name = buffer_get_string(&b, NULL);
434:
435: len = buffer_len(&b);
436: if (len != 0)
1.12 deraadt 437: error("newkeys_from_blob: remaining bytes in blob %u", len);
1.1 provos 438: buffer_free(&b);
439: return (newkey);
440: }
441:
442: int
443: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
444: {
445: Buffer b;
446: int len;
447: u_char *buf;
448: Enc *enc;
449: Mac *mac;
450: Comp *comp;
451: Newkeys *newkey = newkeys[mode];
452:
1.8 markus 453: debug3("%s: converting %p", __func__, newkey);
1.1 provos 454:
455: if (newkey == NULL) {
1.8 markus 456: error("%s: newkey == NULL", __func__);
1.1 provos 457: return 0;
458: }
459: enc = &newkey->enc;
460: mac = &newkey->mac;
461: comp = &newkey->comp;
462:
463: buffer_init(&b);
464: /* Enc structure */
465: buffer_put_cstring(&b, enc->name);
466: /* The cipher struct is constant and shared, you export pointer */
467: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
468: buffer_put_int(&b, enc->enabled);
469: buffer_put_int(&b, enc->block_size);
470: buffer_put_string(&b, enc->key, enc->key_len);
471: packet_get_keyiv(mode, enc->iv, enc->block_size);
472: buffer_put_string(&b, enc->iv, enc->block_size);
473:
474: /* Mac structure */
475: buffer_put_cstring(&b, mac->name);
476: buffer_put_int(&b, mac->enabled);
477: buffer_put_string(&b, mac->key, mac->key_len);
478:
479: /* Comp structure */
480: buffer_put_int(&b, comp->type);
481: buffer_put_int(&b, comp->enabled);
482: buffer_put_cstring(&b, comp->name);
483:
484: len = buffer_len(&b);
485: buf = xmalloc(len);
486: memcpy(buf, buffer_ptr(&b), len);
487: memset(buffer_ptr(&b), 0, len);
488: buffer_free(&b);
489: if (lenp != NULL)
490: *lenp = len;
491: if (blobp != NULL)
492: *blobp = buf;
1.15 ! deraadt 493: else
! 494: xfree(blobp);
1.1 provos 495: return len;
496: }
497:
1.2 markus 498: static void
1.1 provos 499: mm_send_kex(Buffer *m, Kex *kex)
500: {
501: buffer_put_string(m, kex->session_id, kex->session_id_len);
502: buffer_put_int(m, kex->we_need);
503: buffer_put_int(m, kex->hostkey_type);
504: buffer_put_int(m, kex->kex_type);
505: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
506: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
507: buffer_put_int(m, kex->flags);
508: buffer_put_cstring(m, kex->client_version_string);
509: buffer_put_cstring(m, kex->server_version_string);
510: }
511:
512: void
1.7 mouring 513: mm_send_keystate(struct monitor *pmonitor)
1.1 provos 514: {
515: Buffer m;
516: u_char *blob, *p;
517: u_int bloblen, plen;
518:
519: buffer_init(&m);
520:
521: if (!compat20) {
522: u_char iv[24];
1.11 markus 523: u_char *key;
524: u_int ivlen, keylen;
1.1 provos 525:
526: buffer_put_int(&m, packet_get_protocol_flags());
527:
528: buffer_put_int(&m, packet_get_ssh1_cipher());
529:
1.11 markus 530: debug3("%s: Sending ssh1 KEY+IV", __func__);
531: keylen = packet_get_encryption_key(NULL);
532: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
533: keylen = packet_get_encryption_key(key);
534: buffer_put_string(&m, key, keylen);
535: memset(key, 0, keylen);
536: xfree(key);
537:
1.1 provos 538: ivlen = packet_get_keyiv_len(MODE_OUT);
539: packet_get_keyiv(MODE_OUT, iv, ivlen);
540: buffer_put_string(&m, iv, ivlen);
541: ivlen = packet_get_keyiv_len(MODE_OUT);
542: packet_get_keyiv(MODE_IN, iv, ivlen);
543: buffer_put_string(&m, iv, ivlen);
544: goto skip;
545: } else {
546: /* Kex for rekeying */
1.7 mouring 547: mm_send_kex(&m, *pmonitor->m_pkex);
1.1 provos 548: }
549:
550: debug3("%s: Sending new keys: %p %p",
1.8 markus 551: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 552:
553: /* Keys from Kex */
554: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
1.8 markus 555: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 556:
557: buffer_put_string(&m, blob, bloblen);
558: xfree(blob);
559:
560: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 561: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 562:
563: buffer_put_string(&m, blob, bloblen);
564: xfree(blob);
565:
566: buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
567: buffer_put_int(&m, packet_get_seqnr(MODE_IN));
568:
1.8 markus 569: debug3("%s: New keys have been sent", __func__);
1.1 provos 570: skip:
571: /* More key context */
572: plen = packet_get_keycontext(MODE_OUT, NULL);
573: p = xmalloc(plen+1);
574: packet_get_keycontext(MODE_OUT, p);
575: buffer_put_string(&m, p, plen);
576: xfree(p);
577:
578: plen = packet_get_keycontext(MODE_IN, NULL);
579: p = xmalloc(plen+1);
580: packet_get_keycontext(MODE_IN, p);
581: buffer_put_string(&m, p, plen);
582: xfree(p);
583:
584: /* Compression state */
1.8 markus 585: debug3("%s: Sending compression state", __func__);
1.1 provos 586: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
587: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
588:
589: /* Network I/O buffers */
590: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
591: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
592:
1.7 mouring 593: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 594: debug3("%s: Finished sending state", __func__);
1.1 provos 595:
596: buffer_free(&m);
597: }
598:
599: int
600: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
601: {
602: Buffer m;
603: u_char *p;
604: int success = 0;
605:
606: buffer_init(&m);
1.7 mouring 607: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 608:
1.8 markus 609: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 610: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 611:
612: success = buffer_get_int(&m);
613: if (success == 0) {
1.8 markus 614: debug3("%s: pty alloc failed", __func__);
1.1 provos 615: buffer_free(&m);
616: return (0);
617: }
618: p = buffer_get_string(&m, NULL);
619: buffer_free(&m);
620:
621: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
622: xfree(p);
623:
1.7 mouring 624: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
625: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 626:
627: /* Success */
628: return (1);
629: }
630:
631: void
632: mm_session_pty_cleanup2(void *session)
633: {
634: Session *s = session;
635: Buffer m;
636:
637: if (s->ttyfd == -1)
638: return;
639: buffer_init(&m);
640: buffer_put_cstring(&m, s->tty);
1.7 mouring 641: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 642: buffer_free(&m);
1.3 markus 643:
1.1 provos 644: /* closed dup'ed master */
645: if (close(s->ptymaster) < 0)
646: error("close(s->ptymaster): %s", strerror(errno));
647:
648: /* unlink pty from session */
649: s->ttyfd = -1;
650: }
651:
652: /* Request process termination */
653:
654: void
655: mm_terminate(void)
656: {
657: Buffer m;
658:
659: buffer_init(&m);
1.7 mouring 660: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 661: buffer_free(&m);
662: }
663:
664: int
665: mm_ssh1_session_key(BIGNUM *num)
666: {
667: int rsafail;
668: Buffer m;
669:
670: buffer_init(&m);
671: buffer_put_bignum2(&m, num);
1.7 mouring 672: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 673:
1.7 mouring 674: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 675:
676: rsafail = buffer_get_int(&m);
677: buffer_get_bignum2(&m, num);
678:
679: buffer_free(&m);
680:
681: return (rsafail);
682: }
683:
1.2 markus 684: static void
1.1 provos 685: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
686: char ***prompts, u_int **echo_on)
687: {
1.10 deraadt 688: *name = xstrdup("");
689: *infotxt = xstrdup("");
1.1 provos 690: *numprompts = 1;
1.14 deraadt 691: *prompts = xmalloc(*numprompts * sizeof(char *));
1.1 provos 692: *echo_on = xmalloc(*numprompts * sizeof(u_int));
693: (*echo_on)[0] = 0;
694: }
695:
696: int
697: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
698: u_int *numprompts, char ***prompts, u_int **echo_on)
699: {
700: Buffer m;
701: int res;
702: char *challenge;
703:
1.8 markus 704: debug3("%s: entering", __func__);
1.1 provos 705:
706: buffer_init(&m);
1.7 mouring 707: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 708:
1.7 mouring 709: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 710: &m);
711: res = buffer_get_int(&m);
712: if (res == -1) {
1.8 markus 713: debug3("%s: no challenge", __func__);
1.1 provos 714: buffer_free(&m);
715: return (-1);
716: }
717:
718: /* Get the challenge, and format the response */
719: challenge = buffer_get_string(&m, NULL);
720: buffer_free(&m);
721:
722: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
723: (*prompts)[0] = challenge;
724:
1.8 markus 725: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 726:
727: return (0);
728: }
729:
730: int
731: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
732: {
733: Buffer m;
734: int authok;
735:
1.8 markus 736: debug3("%s: entering", __func__);
1.1 provos 737: if (numresponses != 1)
738: return (-1);
739:
740: buffer_init(&m);
741: buffer_put_cstring(&m, responses[0]);
1.7 mouring 742: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 743:
1.7 mouring 744: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 745: MONITOR_ANS_BSDAUTHRESPOND, &m);
746:
747: authok = buffer_get_int(&m);
748: buffer_free(&m);
749:
750: return ((authok == 0) ? -1 : 0);
751: }
752:
753: int
754: mm_skey_query(void *ctx, char **name, char **infotxt,
755: u_int *numprompts, char ***prompts, u_int **echo_on)
756: {
757: Buffer m;
758: int len, res;
759: char *p, *challenge;
760:
1.8 markus 761: debug3("%s: entering", __func__);
1.1 provos 762:
763: buffer_init(&m);
1.7 mouring 764: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 765:
1.7 mouring 766: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 767: &m);
768: res = buffer_get_int(&m);
769: if (res == -1) {
1.8 markus 770: debug3("%s: no challenge", __func__);
1.1 provos 771: buffer_free(&m);
772: return (-1);
773: }
774:
775: /* Get the challenge, and format the response */
776: challenge = buffer_get_string(&m, NULL);
777: buffer_free(&m);
778:
1.8 markus 779: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 780:
781: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
782:
783: len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
784: p = xmalloc(len);
785: strlcpy(p, challenge, len);
786: strlcat(p, SKEY_PROMPT, len);
787: (*prompts)[0] = p;
788: xfree(challenge);
789:
790: return (0);
791: }
792:
793: int
794: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
795: {
796: Buffer m;
797: int authok;
798:
1.8 markus 799: debug3("%s: entering", __func__);
1.1 provos 800: if (numresponses != 1)
801: return (-1);
802:
803: buffer_init(&m);
804: buffer_put_cstring(&m, responses[0]);
1.7 mouring 805: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1.1 provos 806:
1.7 mouring 807: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 808: MONITOR_ANS_SKEYRESPOND, &m);
809:
810: authok = buffer_get_int(&m);
811: buffer_free(&m);
812:
813: return ((authok == 0) ? -1 : 0);
814: }
815:
816: void
817: mm_ssh1_session_id(u_char session_id[16])
818: {
819: Buffer m;
820: int i;
821:
1.8 markus 822: debug3("%s entering", __func__);
1.1 provos 823:
824: buffer_init(&m);
825: for (i = 0; i < 16; i++)
826: buffer_put_char(&m, session_id[i]);
827:
1.7 mouring 828: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 829: buffer_free(&m);
830: }
831:
832: int
833: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
834: {
835: Buffer m;
836: Key *key;
837: u_char *blob;
838: u_int blen;
839: int allowed = 0;
840:
1.8 markus 841: debug3("%s entering", __func__);
1.1 provos 842:
843: buffer_init(&m);
844: buffer_put_bignum2(&m, client_n);
845:
1.7 mouring 846: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
847: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 848:
849: allowed = buffer_get_int(&m);
850:
851: if (allowed && rkey != NULL) {
852: blob = buffer_get_string(&m, &blen);
853: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 854: fatal("%s: key_from_blob failed", __func__);
1.1 provos 855: *rkey = key;
856: xfree(blob);
857: }
858: mm_send_debug(&m);
859: buffer_free(&m);
860:
861: return (allowed);
862: }
863:
864: BIGNUM *
865: mm_auth_rsa_generate_challenge(Key *key)
866: {
867: Buffer m;
868: BIGNUM *challenge;
869: u_char *blob;
870: u_int blen;
871:
1.8 markus 872: debug3("%s entering", __func__);
1.1 provos 873:
874: if ((challenge = BN_new()) == NULL)
1.8 markus 875: fatal("%s: BN_new failed", __func__);
1.1 provos 876:
877: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
878: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 879: fatal("%s: key_to_blob failed", __func__);
1.1 provos 880: key->type = KEY_RSA1;
881:
882: buffer_init(&m);
883: buffer_put_string(&m, blob, blen);
884: xfree(blob);
885:
1.7 mouring 886: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
887: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 888:
889: buffer_get_bignum2(&m, challenge);
890: buffer_free(&m);
891:
892: return (challenge);
893: }
894:
895: int
896: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
897: {
898: Buffer m;
899: u_char *blob;
900: u_int blen;
901: int success = 0;
902:
1.8 markus 903: debug3("%s entering", __func__);
1.1 provos 904:
905: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
906: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 907: fatal("%s: key_to_blob failed", __func__);
1.1 provos 908: key->type = KEY_RSA1;
909:
910: buffer_init(&m);
911: buffer_put_string(&m, blob, blen);
912: buffer_put_string(&m, response, 16);
913: xfree(blob);
914:
1.7 mouring 915: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
916: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 917:
918: success = buffer_get_int(&m);
919: buffer_free(&m);
920:
921: return (success);
922: }
![[BACK]](/icons/back.gif){kind=icon}
Return to monitor_wrap.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh