Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.20
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"
1.20 ! deraadt 28: RCSID("$OpenBSD: monitor_wrap.c,v 1.19 2002/09/26 11:38:43 markus 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: Enc *enc;
448: Mac *mac;
449: Comp *comp;
450: Newkeys *newkey = newkeys[mode];
451:
1.8 markus 452: debug3("%s: converting %p", __func__, newkey);
1.1 provos 453:
454: if (newkey == NULL) {
1.8 markus 455: error("%s: newkey == NULL", __func__);
1.1 provos 456: return 0;
457: }
458: enc = &newkey->enc;
459: mac = &newkey->mac;
460: comp = &newkey->comp;
461:
462: buffer_init(&b);
463: /* Enc structure */
464: buffer_put_cstring(&b, enc->name);
465: /* The cipher struct is constant and shared, you export pointer */
466: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
467: buffer_put_int(&b, enc->enabled);
468: buffer_put_int(&b, enc->block_size);
469: buffer_put_string(&b, enc->key, enc->key_len);
470: packet_get_keyiv(mode, enc->iv, enc->block_size);
471: buffer_put_string(&b, enc->iv, enc->block_size);
472:
473: /* Mac structure */
474: buffer_put_cstring(&b, mac->name);
475: buffer_put_int(&b, mac->enabled);
476: buffer_put_string(&b, mac->key, mac->key_len);
477:
478: /* Comp structure */
479: buffer_put_int(&b, comp->type);
480: buffer_put_int(&b, comp->enabled);
481: buffer_put_cstring(&b, comp->name);
482:
483: len = buffer_len(&b);
1.16 markus 484: if (lenp != NULL)
485: *lenp = len;
486: if (blobp != NULL) {
487: *blobp = xmalloc(len);
488: memcpy(*blobp, buffer_ptr(&b), len);
489: }
1.1 provos 490: memset(buffer_ptr(&b), 0, len);
491: buffer_free(&b);
492: return len;
493: }
494:
1.2 markus 495: static void
1.1 provos 496: mm_send_kex(Buffer *m, Kex *kex)
497: {
498: buffer_put_string(m, kex->session_id, kex->session_id_len);
499: buffer_put_int(m, kex->we_need);
500: buffer_put_int(m, kex->hostkey_type);
501: buffer_put_int(m, kex->kex_type);
502: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
503: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
504: buffer_put_int(m, kex->flags);
505: buffer_put_cstring(m, kex->client_version_string);
506: buffer_put_cstring(m, kex->server_version_string);
507: }
508:
509: void
1.7 mouring 510: mm_send_keystate(struct monitor *pmonitor)
1.1 provos 511: {
512: Buffer m;
513: u_char *blob, *p;
514: u_int bloblen, plen;
515:
516: buffer_init(&m);
517:
518: if (!compat20) {
519: u_char iv[24];
1.11 markus 520: u_char *key;
521: u_int ivlen, keylen;
1.1 provos 522:
523: buffer_put_int(&m, packet_get_protocol_flags());
524:
525: buffer_put_int(&m, packet_get_ssh1_cipher());
526:
1.11 markus 527: debug3("%s: Sending ssh1 KEY+IV", __func__);
528: keylen = packet_get_encryption_key(NULL);
529: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
530: keylen = packet_get_encryption_key(key);
531: buffer_put_string(&m, key, keylen);
532: memset(key, 0, keylen);
533: xfree(key);
534:
1.1 provos 535: ivlen = packet_get_keyiv_len(MODE_OUT);
536: packet_get_keyiv(MODE_OUT, iv, ivlen);
537: buffer_put_string(&m, iv, ivlen);
538: ivlen = packet_get_keyiv_len(MODE_OUT);
539: packet_get_keyiv(MODE_IN, iv, ivlen);
540: buffer_put_string(&m, iv, ivlen);
541: goto skip;
542: } else {
543: /* Kex for rekeying */
1.7 mouring 544: mm_send_kex(&m, *pmonitor->m_pkex);
1.1 provos 545: }
546:
547: debug3("%s: Sending new keys: %p %p",
1.8 markus 548: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 549:
550: /* Keys from Kex */
551: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
1.8 markus 552: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 553:
554: buffer_put_string(&m, blob, bloblen);
555: xfree(blob);
556:
557: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 558: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 559:
560: buffer_put_string(&m, blob, bloblen);
561: xfree(blob);
562:
563: buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
564: buffer_put_int(&m, packet_get_seqnr(MODE_IN));
565:
1.8 markus 566: debug3("%s: New keys have been sent", __func__);
1.1 provos 567: skip:
568: /* More key context */
569: plen = packet_get_keycontext(MODE_OUT, NULL);
570: p = xmalloc(plen+1);
571: packet_get_keycontext(MODE_OUT, p);
572: buffer_put_string(&m, p, plen);
573: xfree(p);
574:
575: plen = packet_get_keycontext(MODE_IN, NULL);
576: p = xmalloc(plen+1);
577: packet_get_keycontext(MODE_IN, p);
578: buffer_put_string(&m, p, plen);
579: xfree(p);
580:
581: /* Compression state */
1.8 markus 582: debug3("%s: Sending compression state", __func__);
1.1 provos 583: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
584: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
585:
586: /* Network I/O buffers */
587: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
588: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
589:
1.7 mouring 590: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 591: debug3("%s: Finished sending state", __func__);
1.1 provos 592:
593: buffer_free(&m);
594: }
595:
596: int
597: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
598: {
599: Buffer m;
1.18 markus 600: char *p;
1.1 provos 601: int success = 0;
602:
603: buffer_init(&m);
1.7 mouring 604: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 605:
1.8 markus 606: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 607: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 608:
609: success = buffer_get_int(&m);
610: if (success == 0) {
1.8 markus 611: debug3("%s: pty alloc failed", __func__);
1.1 provos 612: buffer_free(&m);
613: return (0);
614: }
615: p = buffer_get_string(&m, NULL);
616: buffer_free(&m);
617:
618: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
619: xfree(p);
620:
1.7 mouring 621: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
622: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 623:
624: /* Success */
625: return (1);
626: }
627:
628: void
629: mm_session_pty_cleanup2(void *session)
630: {
631: Session *s = session;
632: Buffer m;
633:
634: if (s->ttyfd == -1)
635: return;
636: buffer_init(&m);
637: buffer_put_cstring(&m, s->tty);
1.7 mouring 638: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 639: buffer_free(&m);
1.3 markus 640:
1.1 provos 641: /* closed dup'ed master */
642: if (close(s->ptymaster) < 0)
643: error("close(s->ptymaster): %s", strerror(errno));
644:
645: /* unlink pty from session */
646: s->ttyfd = -1;
647: }
648:
649: /* Request process termination */
650:
651: void
652: mm_terminate(void)
653: {
654: Buffer m;
655:
656: buffer_init(&m);
1.7 mouring 657: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 658: buffer_free(&m);
659: }
660:
661: int
662: mm_ssh1_session_key(BIGNUM *num)
663: {
664: int rsafail;
665: Buffer m;
666:
667: buffer_init(&m);
668: buffer_put_bignum2(&m, num);
1.7 mouring 669: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 670:
1.7 mouring 671: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 672:
673: rsafail = buffer_get_int(&m);
674: buffer_get_bignum2(&m, num);
675:
676: buffer_free(&m);
677:
678: return (rsafail);
679: }
680:
1.2 markus 681: static void
1.1 provos 682: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
683: char ***prompts, u_int **echo_on)
684: {
1.10 deraadt 685: *name = xstrdup("");
686: *infotxt = xstrdup("");
1.1 provos 687: *numprompts = 1;
1.14 deraadt 688: *prompts = xmalloc(*numprompts * sizeof(char *));
1.1 provos 689: *echo_on = xmalloc(*numprompts * sizeof(u_int));
690: (*echo_on)[0] = 0;
691: }
692:
693: int
694: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
695: u_int *numprompts, char ***prompts, u_int **echo_on)
696: {
697: Buffer m;
698: int res;
699: char *challenge;
700:
1.8 markus 701: debug3("%s: entering", __func__);
1.1 provos 702:
703: buffer_init(&m);
1.7 mouring 704: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 705:
1.7 mouring 706: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 707: &m);
708: res = buffer_get_int(&m);
709: if (res == -1) {
1.8 markus 710: debug3("%s: no challenge", __func__);
1.1 provos 711: buffer_free(&m);
712: return (-1);
713: }
714:
715: /* Get the challenge, and format the response */
716: challenge = buffer_get_string(&m, NULL);
717: buffer_free(&m);
718:
719: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
720: (*prompts)[0] = challenge;
721:
1.8 markus 722: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 723:
724: return (0);
725: }
726:
727: int
728: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
729: {
730: Buffer m;
731: int authok;
732:
1.8 markus 733: debug3("%s: entering", __func__);
1.1 provos 734: if (numresponses != 1)
735: return (-1);
736:
737: buffer_init(&m);
738: buffer_put_cstring(&m, responses[0]);
1.7 mouring 739: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 740:
1.7 mouring 741: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 742: MONITOR_ANS_BSDAUTHRESPOND, &m);
743:
744: authok = buffer_get_int(&m);
745: buffer_free(&m);
746:
747: return ((authok == 0) ? -1 : 0);
748: }
749:
750: int
751: mm_skey_query(void *ctx, char **name, char **infotxt,
752: u_int *numprompts, char ***prompts, u_int **echo_on)
753: {
754: Buffer m;
755: int len, res;
756: char *p, *challenge;
757:
1.8 markus 758: debug3("%s: entering", __func__);
1.1 provos 759:
760: buffer_init(&m);
1.7 mouring 761: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 762:
1.7 mouring 763: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 764: &m);
765: res = buffer_get_int(&m);
766: if (res == -1) {
1.8 markus 767: debug3("%s: no challenge", __func__);
1.1 provos 768: buffer_free(&m);
769: return (-1);
770: }
771:
772: /* Get the challenge, and format the response */
773: challenge = buffer_get_string(&m, NULL);
774: buffer_free(&m);
775:
1.8 markus 776: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 777:
778: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
779:
780: len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
781: p = xmalloc(len);
782: strlcpy(p, challenge, len);
783: strlcat(p, SKEY_PROMPT, len);
784: (*prompts)[0] = p;
785: xfree(challenge);
786:
787: return (0);
788: }
789:
790: int
791: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
792: {
793: Buffer m;
794: int authok;
795:
1.8 markus 796: debug3("%s: entering", __func__);
1.1 provos 797: if (numresponses != 1)
798: return (-1);
799:
800: buffer_init(&m);
801: buffer_put_cstring(&m, responses[0]);
1.7 mouring 802: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1.1 provos 803:
1.7 mouring 804: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 805: MONITOR_ANS_SKEYRESPOND, &m);
806:
807: authok = buffer_get_int(&m);
808: buffer_free(&m);
809:
810: return ((authok == 0) ? -1 : 0);
811: }
812:
813: void
814: mm_ssh1_session_id(u_char session_id[16])
815: {
816: Buffer m;
817: int i;
818:
1.8 markus 819: debug3("%s entering", __func__);
1.1 provos 820:
821: buffer_init(&m);
822: for (i = 0; i < 16; i++)
823: buffer_put_char(&m, session_id[i]);
824:
1.7 mouring 825: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 826: buffer_free(&m);
827: }
828:
829: int
830: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
831: {
832: Buffer m;
833: Key *key;
834: u_char *blob;
835: u_int blen;
836: int allowed = 0;
837:
1.8 markus 838: debug3("%s entering", __func__);
1.1 provos 839:
840: buffer_init(&m);
841: buffer_put_bignum2(&m, client_n);
842:
1.7 mouring 843: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
844: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 845:
846: allowed = buffer_get_int(&m);
847:
848: if (allowed && rkey != NULL) {
849: blob = buffer_get_string(&m, &blen);
850: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 851: fatal("%s: key_from_blob failed", __func__);
1.1 provos 852: *rkey = key;
853: xfree(blob);
854: }
855: mm_send_debug(&m);
856: buffer_free(&m);
857:
858: return (allowed);
859: }
860:
861: BIGNUM *
862: mm_auth_rsa_generate_challenge(Key *key)
863: {
864: Buffer m;
865: BIGNUM *challenge;
866: u_char *blob;
867: u_int blen;
868:
1.8 markus 869: debug3("%s entering", __func__);
1.1 provos 870:
871: if ((challenge = BN_new()) == NULL)
1.8 markus 872: fatal("%s: BN_new failed", __func__);
1.1 provos 873:
874: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
875: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 876: fatal("%s: key_to_blob failed", __func__);
1.1 provos 877: key->type = KEY_RSA1;
878:
879: buffer_init(&m);
880: buffer_put_string(&m, blob, blen);
881: xfree(blob);
882:
1.7 mouring 883: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
884: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 885:
886: buffer_get_bignum2(&m, challenge);
887: buffer_free(&m);
888:
889: return (challenge);
890: }
891:
892: int
893: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
894: {
895: Buffer m;
896: u_char *blob;
897: u_int blen;
898: int success = 0;
899:
1.8 markus 900: debug3("%s entering", __func__);
1.1 provos 901:
902: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
903: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 904: fatal("%s: key_to_blob failed", __func__);
1.1 provos 905: key->type = KEY_RSA1;
906:
907: buffer_init(&m);
908: buffer_put_string(&m, blob, blen);
909: buffer_put_string(&m, response, 16);
910: xfree(blob);
911:
1.7 mouring 912: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
913: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 914:
915: success = buffer_get_int(&m);
916: buffer_free(&m);
917:
918: return (success);
919: }
1.19 markus 920:
921: #ifdef KRB4
922: int
923: mm_auth_krb4(Authctxt *authctxt, void *_auth, char **client, void *_reply)
924: {
925: KTEXT auth, reply;
926: Buffer m;
927: u_int rlen;
928: int success = 0;
929: char *p;
930:
931: debug3("%s entering", __func__);
932: auth = _auth;
933: reply = _reply;
934:
935: buffer_init(&m);
936: buffer_put_string(&m, auth->dat, auth->length);
937:
938: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB4, &m);
939: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB4, &m);
940:
941: success = buffer_get_int(&m);
942: if (success) {
943: *client = buffer_get_string(&m, NULL);
944: p = buffer_get_string(&m, &rlen);
945: if (rlen >= MAX_KTXT_LEN)
946: fatal("%s: reply from monitor too large", __func__);
947: reply->length = rlen;
948: memcpy(reply->dat, p, rlen);
949: memset(p, 0, rlen);
950: xfree(p);
951: }
952: buffer_free(&m);
1.20 ! deraadt 953: return (success);
1.19 markus 954: }
955: #endif
1.17 itojun 956:
957: #ifdef KRB5
958: int
959: mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp)
960: {
961: krb5_data *tkt, *reply;
962: Buffer m;
963: int success;
964:
965: debug3("%s entering", __func__);
966: tkt = (krb5_data *) argp;
967: reply = (krb5_data *) resp;
968:
969: buffer_init(&m);
970: buffer_put_string(&m, tkt->data, tkt->length);
971:
972: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, &m);
973: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, &m);
974:
975: success = buffer_get_int(&m);
976: if (success) {
977: u_int len;
978:
979: *userp = buffer_get_string(&m, NULL);
980: reply->data = buffer_get_string(&m, &len);
981: reply->length = len;
982: } else {
983: memset(reply, 0, sizeof(*reply));
984: *userp = NULL;
985: }
986:
987: buffer_free(&m);
988: return (success);
989: }
990: #endif
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