Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.49
1.49 ! stevesk 1: /* $OpenBSD: monitor_wrap.c,v 1.48 2006/07/22 20:48:23 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>
1.49 ! stevesk 37: #include <stdio.h>
1.48 stevesk 38: #include <string.h>
1.1 provos 39:
40: #include "ssh.h"
41: #include "dh.h"
42: #include "kex.h"
43: #include "auth.h"
1.22 markus 44: #include "auth-options.h"
1.1 provos 45: #include "buffer.h"
46: #include "bufaux.h"
47: #include "packet.h"
48: #include "mac.h"
49: #include "log.h"
50: #include "zlib.h"
51: #include "monitor.h"
52: #include "monitor_wrap.h"
53: #include "xmalloc.h"
54: #include "atomicio.h"
55: #include "monitor_fdpass.h"
1.45 djm 56: #include "misc.h"
1.1 provos 57:
58: #include "auth.h"
59: #include "channels.h"
60: #include "session.h"
61:
1.29 markus 62: #ifdef GSSAPI
63: #include "ssh-gss.h"
64: #endif
65:
1.1 provos 66: /* Imports */
67: extern int compat20;
68: extern Newkeys *newkeys[];
69: extern z_stream incoming_stream;
70: extern z_stream outgoing_stream;
1.7 mouring 71: extern struct monitor *pmonitor;
1.1 provos 72: extern Buffer input, output;
1.39 dtucker 73: extern Buffer loginmsg;
1.1 provos 74:
1.32 markus 75: int
76: mm_is_monitor(void)
77: {
78: /*
79: * m_pid is only set in the privileged part, and
80: * points to the unprivileged child.
81: */
1.34 markus 82: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 83: }
84:
1.1 provos 85: void
1.36 avsm 86: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 87: {
1.13 deraadt 88: u_int mlen = buffer_len(m);
1.1 provos 89: u_char buf[5];
90:
1.8 markus 91: debug3("%s entering: type %d", __func__, type);
1.1 provos 92:
1.45 djm 93: put_u32(buf, mlen + 1);
1.10 deraadt 94: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 95: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 96: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 97: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.40 avsm 98: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 99: }
100:
101: void
1.36 avsm 102: mm_request_receive(int sock, Buffer *m)
1.1 provos 103: {
104: u_char buf[4];
1.13 deraadt 105: u_int msg_len;
1.1 provos 106:
1.8 markus 107: debug3("%s entering", __func__);
1.1 provos 108:
1.40 avsm 109: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
110: if (errno == EPIPE)
1.32 markus 111: cleanup_exit(255);
1.40 avsm 112: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 113: }
1.45 djm 114: msg_len = get_u32(buf);
1.1 provos 115: if (msg_len > 256 * 1024)
1.8 markus 116: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 117: buffer_clear(m);
118: buffer_append_space(m, msg_len);
1.40 avsm 119: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
120: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 121: }
122:
123: void
1.36 avsm 124: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 125: {
126: u_char rtype;
127:
1.8 markus 128: debug3("%s entering: type %d", __func__, type);
1.1 provos 129:
1.36 avsm 130: mm_request_receive(sock, m);
1.1 provos 131: rtype = buffer_get_char(m);
132: if (rtype != type)
1.8 markus 133: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 134: rtype, type);
135: }
136:
137: DH *
138: mm_choose_dh(int min, int nbits, int max)
139: {
140: BIGNUM *p, *g;
141: int success = 0;
142: Buffer m;
143:
144: buffer_init(&m);
145: buffer_put_int(&m, min);
146: buffer_put_int(&m, nbits);
147: buffer_put_int(&m, max);
148:
1.7 mouring 149: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 150:
1.8 markus 151: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 152: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 153:
154: success = buffer_get_char(&m);
155: if (success == 0)
1.8 markus 156: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 157:
158: if ((p = BN_new()) == NULL)
1.8 markus 159: fatal("%s: BN_new failed", __func__);
1.3 markus 160: if ((g = BN_new()) == NULL)
1.8 markus 161: fatal("%s: BN_new failed", __func__);
1.1 provos 162: buffer_get_bignum2(&m, p);
163: buffer_get_bignum2(&m, g);
164:
1.8 markus 165: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 166: buffer_free(&m);
167:
168: return (dh_new_group(g, p));
169: }
170:
171: int
172: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
173: {
1.7 mouring 174: Kex *kex = *pmonitor->m_pkex;
1.1 provos 175: Buffer m;
176:
1.8 markus 177: debug3("%s entering", __func__);
1.1 provos 178:
179: buffer_init(&m);
180: buffer_put_int(&m, kex->host_key_index(key));
181: buffer_put_string(&m, data, datalen);
182:
1.7 mouring 183: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 184:
1.8 markus 185: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 186: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 187: *sigp = buffer_get_string(&m, lenp);
188: buffer_free(&m);
189:
190: return (0);
191: }
192:
193: struct passwd *
1.37 dtucker 194: mm_getpwnamallow(const char *username)
1.1 provos 195: {
196: Buffer m;
197: struct passwd *pw;
198: u_int pwlen;
199:
1.8 markus 200: debug3("%s entering", __func__);
1.1 provos 201:
202: buffer_init(&m);
1.37 dtucker 203: buffer_put_cstring(&m, username);
1.1 provos 204:
1.7 mouring 205: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 206:
1.8 markus 207: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 208: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 209:
210: if (buffer_get_char(&m) == 0) {
211: buffer_free(&m);
212: return (NULL);
213: }
214: pw = buffer_get_string(&m, &pwlen);
215: if (pwlen != sizeof(struct passwd))
1.8 markus 216: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 217: pw->pw_name = buffer_get_string(&m, NULL);
218: pw->pw_passwd = buffer_get_string(&m, NULL);
219: pw->pw_gecos = buffer_get_string(&m, NULL);
220: pw->pw_class = buffer_get_string(&m, NULL);
221: pw->pw_dir = buffer_get_string(&m, NULL);
222: pw->pw_shell = buffer_get_string(&m, NULL);
223: buffer_free(&m);
224:
225: return (pw);
1.6 djm 226: }
227:
1.33 markus 228: char *
229: mm_auth2_read_banner(void)
1.6 djm 230: {
231: Buffer m;
232: char *banner;
233:
1.8 markus 234: debug3("%s entering", __func__);
1.6 djm 235:
236: buffer_init(&m);
1.7 mouring 237: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 238: buffer_clear(&m);
239:
1.33 markus 240: mm_request_receive_expect(pmonitor->m_recvfd,
241: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 242: banner = buffer_get_string(&m, NULL);
243: buffer_free(&m);
1.10 deraadt 244:
1.33 markus 245: /* treat empty banner as missing banner */
246: if (strlen(banner) == 0) {
247: xfree(banner);
248: banner = NULL;
249: }
1.6 djm 250: return (banner);
1.1 provos 251: }
252:
253: /* Inform the privileged process about service and style */
254:
255: void
256: mm_inform_authserv(char *service, char *style)
257: {
258: Buffer m;
259:
1.8 markus 260: debug3("%s entering", __func__);
1.1 provos 261:
262: buffer_init(&m);
263: buffer_put_cstring(&m, service);
264: buffer_put_cstring(&m, style ? style : "");
265:
1.7 mouring 266: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 267:
268: buffer_free(&m);
269: }
270:
271: /* Do the password authentication */
272: int
273: mm_auth_password(Authctxt *authctxt, char *password)
274: {
275: Buffer m;
276: int authenticated = 0;
277:
1.8 markus 278: debug3("%s entering", __func__);
1.1 provos 279:
280: buffer_init(&m);
281: buffer_put_cstring(&m, password);
1.7 mouring 282: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 283:
1.8 markus 284: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 285: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 286:
287: authenticated = buffer_get_int(&m);
288:
289: buffer_free(&m);
290:
1.3 markus 291: debug3("%s: user %sauthenticated",
1.8 markus 292: __func__, authenticated ? "" : "not ");
1.1 provos 293: return (authenticated);
294: }
295:
296: int
297: mm_user_key_allowed(struct passwd *pw, Key *key)
298: {
299: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
300: }
301:
302: int
303: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
304: Key *key)
305: {
306: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
307: }
308:
309: int
310: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
311: char *host, Key *key)
312: {
313: int ret;
314:
315: key->type = KEY_RSA; /* XXX hack for key_to_blob */
316: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
317: key->type = KEY_RSA1;
318: return (ret);
319: }
320:
1.2 markus 321: static void
1.1 provos 322: mm_send_debug(Buffer *m)
323: {
324: char *msg;
325:
326: while (buffer_len(m)) {
327: msg = buffer_get_string(m, NULL);
1.8 markus 328: debug3("%s: Sending debug: %s", __func__, msg);
1.1 provos 329: packet_send_debug("%s", msg);
330: xfree(msg);
331: }
332: }
333:
334: int
335: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
336: {
337: Buffer m;
338: u_char *blob;
339: u_int len;
1.22 markus 340: int allowed = 0, have_forced = 0;
1.1 provos 341:
1.8 markus 342: debug3("%s entering", __func__);
1.1 provos 343:
344: /* Convert the key to a blob and the pass it over */
345: if (!key_to_blob(key, &blob, &len))
346: return (0);
347:
348: buffer_init(&m);
349: buffer_put_int(&m, type);
350: buffer_put_cstring(&m, user ? user : "");
351: buffer_put_cstring(&m, host ? host : "");
352: buffer_put_string(&m, blob, len);
353: xfree(blob);
354:
1.7 mouring 355: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 356:
1.8 markus 357: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 358: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 359:
360: allowed = buffer_get_int(&m);
361:
1.22 markus 362: /* fake forced command */
363: auth_clear_options();
364: have_forced = buffer_get_int(&m);
365: forced_command = have_forced ? xstrdup("true") : NULL;
366:
1.1 provos 367: /* Send potential debug messages */
368: mm_send_debug(&m);
369:
370: buffer_free(&m);
371:
372: return (allowed);
373: }
374:
1.3 markus 375: /*
1.1 provos 376: * This key verify needs to send the key type along, because the
377: * privileged parent makes the decision if the key is allowed
378: * for authentication.
379: */
380:
381: int
382: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
383: {
384: Buffer m;
385: u_char *blob;
386: u_int len;
387: int verified = 0;
388:
1.8 markus 389: debug3("%s entering", __func__);
1.1 provos 390:
391: /* Convert the key to a blob and the pass it over */
392: if (!key_to_blob(key, &blob, &len))
393: return (0);
394:
395: buffer_init(&m);
396: buffer_put_string(&m, blob, len);
397: buffer_put_string(&m, sig, siglen);
398: buffer_put_string(&m, data, datalen);
399: xfree(blob);
400:
1.7 mouring 401: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 402:
1.8 markus 403: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 404: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 405:
406: verified = buffer_get_int(&m);
407:
408: buffer_free(&m);
409:
410: return (verified);
411: }
412:
413: /* Export key state after authentication */
414: Newkeys *
415: mm_newkeys_from_blob(u_char *blob, int blen)
416: {
417: Buffer b;
418: u_int len;
419: Newkeys *newkey = NULL;
420: Enc *enc;
421: Mac *mac;
422: Comp *comp;
423:
1.8 markus 424: debug3("%s: %p(%d)", __func__, blob, blen);
1.1 provos 425: #ifdef DEBUG_PK
426: dump_base64(stderr, blob, blen);
427: #endif
428: buffer_init(&b);
429: buffer_append(&b, blob, blen);
430:
431: newkey = xmalloc(sizeof(*newkey));
432: enc = &newkey->enc;
433: mac = &newkey->mac;
434: comp = &newkey->comp;
435:
436: /* Enc structure */
437: enc->name = buffer_get_string(&b, NULL);
438: buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
439: enc->enabled = buffer_get_int(&b);
440: enc->block_size = buffer_get_int(&b);
441: enc->key = buffer_get_string(&b, &enc->key_len);
442: enc->iv = buffer_get_string(&b, &len);
443: if (len != enc->block_size)
1.12 deraadt 444: fatal("%s: bad ivlen: expected %u != %u", __func__,
1.1 provos 445: enc->block_size, len);
446:
447: if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
1.8 markus 448: fatal("%s: bad cipher name %s or pointer %p", __func__,
1.1 provos 449: enc->name, enc->cipher);
450:
451: /* Mac structure */
452: mac->name = buffer_get_string(&b, NULL);
453: if (mac->name == NULL || mac_init(mac, mac->name) == -1)
1.8 markus 454: fatal("%s: can not init mac %s", __func__, mac->name);
1.1 provos 455: mac->enabled = buffer_get_int(&b);
456: mac->key = buffer_get_string(&b, &len);
457: if (len > mac->key_len)
1.12 deraadt 458: fatal("%s: bad mac key length: %u > %d", __func__, len,
1.1 provos 459: mac->key_len);
460: mac->key_len = len;
461:
462: /* Comp structure */
463: comp->type = buffer_get_int(&b);
464: comp->enabled = buffer_get_int(&b);
465: comp->name = buffer_get_string(&b, NULL);
466:
467: len = buffer_len(&b);
468: if (len != 0)
1.12 deraadt 469: error("newkeys_from_blob: remaining bytes in blob %u", len);
1.1 provos 470: buffer_free(&b);
471: return (newkey);
472: }
473:
474: int
475: mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
476: {
477: Buffer b;
478: int len;
479: Enc *enc;
480: Mac *mac;
481: Comp *comp;
482: Newkeys *newkey = newkeys[mode];
483:
1.8 markus 484: debug3("%s: converting %p", __func__, newkey);
1.1 provos 485:
486: if (newkey == NULL) {
1.8 markus 487: error("%s: newkey == NULL", __func__);
1.1 provos 488: return 0;
489: }
490: enc = &newkey->enc;
491: mac = &newkey->mac;
492: comp = &newkey->comp;
493:
494: buffer_init(&b);
495: /* Enc structure */
496: buffer_put_cstring(&b, enc->name);
497: /* The cipher struct is constant and shared, you export pointer */
498: buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
499: buffer_put_int(&b, enc->enabled);
500: buffer_put_int(&b, enc->block_size);
501: buffer_put_string(&b, enc->key, enc->key_len);
502: packet_get_keyiv(mode, enc->iv, enc->block_size);
503: buffer_put_string(&b, enc->iv, enc->block_size);
504:
505: /* Mac structure */
506: buffer_put_cstring(&b, mac->name);
507: buffer_put_int(&b, mac->enabled);
508: buffer_put_string(&b, mac->key, mac->key_len);
509:
510: /* Comp structure */
511: buffer_put_int(&b, comp->type);
512: buffer_put_int(&b, comp->enabled);
513: buffer_put_cstring(&b, comp->name);
514:
515: len = buffer_len(&b);
1.16 markus 516: if (lenp != NULL)
517: *lenp = len;
518: if (blobp != NULL) {
519: *blobp = xmalloc(len);
520: memcpy(*blobp, buffer_ptr(&b), len);
521: }
1.1 provos 522: memset(buffer_ptr(&b), 0, len);
523: buffer_free(&b);
524: return len;
525: }
526:
1.2 markus 527: static void
1.1 provos 528: mm_send_kex(Buffer *m, Kex *kex)
529: {
530: buffer_put_string(m, kex->session_id, kex->session_id_len);
531: buffer_put_int(m, kex->we_need);
532: buffer_put_int(m, kex->hostkey_type);
533: buffer_put_int(m, kex->kex_type);
534: buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
535: buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
536: buffer_put_int(m, kex->flags);
537: buffer_put_cstring(m, kex->client_version_string);
538: buffer_put_cstring(m, kex->server_version_string);
539: }
540:
541: void
1.36 avsm 542: mm_send_keystate(struct monitor *monitor)
1.1 provos 543: {
544: Buffer m;
545: u_char *blob, *p;
546: u_int bloblen, plen;
1.25 markus 547: u_int32_t seqnr, packets;
548: u_int64_t blocks;
1.1 provos 549:
550: buffer_init(&m);
551:
552: if (!compat20) {
553: u_char iv[24];
1.11 markus 554: u_char *key;
555: u_int ivlen, keylen;
1.1 provos 556:
557: buffer_put_int(&m, packet_get_protocol_flags());
558:
559: buffer_put_int(&m, packet_get_ssh1_cipher());
560:
1.11 markus 561: debug3("%s: Sending ssh1 KEY+IV", __func__);
562: keylen = packet_get_encryption_key(NULL);
563: key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
564: keylen = packet_get_encryption_key(key);
565: buffer_put_string(&m, key, keylen);
566: memset(key, 0, keylen);
567: xfree(key);
568:
1.1 provos 569: ivlen = packet_get_keyiv_len(MODE_OUT);
570: packet_get_keyiv(MODE_OUT, iv, ivlen);
571: buffer_put_string(&m, iv, ivlen);
572: ivlen = packet_get_keyiv_len(MODE_OUT);
573: packet_get_keyiv(MODE_IN, iv, ivlen);
574: buffer_put_string(&m, iv, ivlen);
575: goto skip;
576: } else {
577: /* Kex for rekeying */
1.36 avsm 578: mm_send_kex(&m, *monitor->m_pkex);
1.1 provos 579: }
580:
581: debug3("%s: Sending new keys: %p %p",
1.8 markus 582: __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
1.1 provos 583:
584: /* Keys from Kex */
585: if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
1.8 markus 586: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 587:
588: buffer_put_string(&m, blob, bloblen);
589: xfree(blob);
590:
591: if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
1.8 markus 592: fatal("%s: conversion of newkeys failed", __func__);
1.1 provos 593:
594: buffer_put_string(&m, blob, bloblen);
595: xfree(blob);
596:
1.25 markus 597: packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
598: buffer_put_int(&m, seqnr);
599: buffer_put_int64(&m, blocks);
600: buffer_put_int(&m, packets);
1.26 markus 601: packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
1.25 markus 602: buffer_put_int(&m, seqnr);
603: buffer_put_int64(&m, blocks);
604: buffer_put_int(&m, packets);
1.1 provos 605:
1.8 markus 606: debug3("%s: New keys have been sent", __func__);
1.1 provos 607: skip:
608: /* More key context */
609: plen = packet_get_keycontext(MODE_OUT, NULL);
610: p = xmalloc(plen+1);
611: packet_get_keycontext(MODE_OUT, p);
612: buffer_put_string(&m, p, plen);
613: xfree(p);
614:
615: plen = packet_get_keycontext(MODE_IN, NULL);
616: p = xmalloc(plen+1);
617: packet_get_keycontext(MODE_IN, p);
618: buffer_put_string(&m, p, plen);
619: xfree(p);
620:
621: /* Compression state */
1.8 markus 622: debug3("%s: Sending compression state", __func__);
1.1 provos 623: buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
624: buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
625:
626: /* Network I/O buffers */
627: buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
628: buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
629:
1.36 avsm 630: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
1.8 markus 631: debug3("%s: Finished sending state", __func__);
1.1 provos 632:
633: buffer_free(&m);
634: }
635:
636: int
1.42 deraadt 637: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 638: {
639: Buffer m;
1.39 dtucker 640: char *p, *msg;
1.1 provos 641: int success = 0;
642:
643: buffer_init(&m);
1.7 mouring 644: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 645:
1.8 markus 646: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 647: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 648:
649: success = buffer_get_int(&m);
650: if (success == 0) {
1.8 markus 651: debug3("%s: pty alloc failed", __func__);
1.1 provos 652: buffer_free(&m);
653: return (0);
654: }
655: p = buffer_get_string(&m, NULL);
1.39 dtucker 656: msg = buffer_get_string(&m, NULL);
1.1 provos 657: buffer_free(&m);
658:
659: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
660: xfree(p);
1.39 dtucker 661:
662: buffer_append(&loginmsg, msg, strlen(msg));
663: xfree(msg);
1.1 provos 664:
1.7 mouring 665: *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
666: *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
1.1 provos 667:
668: /* Success */
669: return (1);
670: }
671:
672: void
1.32 markus 673: mm_session_pty_cleanup2(Session *s)
1.1 provos 674: {
675: Buffer m;
676:
677: if (s->ttyfd == -1)
678: return;
679: buffer_init(&m);
680: buffer_put_cstring(&m, s->tty);
1.7 mouring 681: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 682: buffer_free(&m);
1.3 markus 683:
1.1 provos 684: /* closed dup'ed master */
685: if (close(s->ptymaster) < 0)
686: error("close(s->ptymaster): %s", strerror(errno));
687:
688: /* unlink pty from session */
689: s->ttyfd = -1;
690: }
691:
692: /* Request process termination */
693:
694: void
695: mm_terminate(void)
696: {
697: Buffer m;
698:
699: buffer_init(&m);
1.7 mouring 700: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 701: buffer_free(&m);
702: }
703:
704: int
705: mm_ssh1_session_key(BIGNUM *num)
706: {
707: int rsafail;
708: Buffer m;
709:
710: buffer_init(&m);
711: buffer_put_bignum2(&m, num);
1.7 mouring 712: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 713:
1.7 mouring 714: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 715:
716: rsafail = buffer_get_int(&m);
717: buffer_get_bignum2(&m, num);
718:
719: buffer_free(&m);
720:
721: return (rsafail);
722: }
723:
1.2 markus 724: static void
1.1 provos 725: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
726: char ***prompts, u_int **echo_on)
727: {
1.10 deraadt 728: *name = xstrdup("");
729: *infotxt = xstrdup("");
1.1 provos 730: *numprompts = 1;
1.43 djm 731: *prompts = xcalloc(*numprompts, sizeof(char *));
732: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 733: (*echo_on)[0] = 0;
734: }
735:
736: int
737: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
738: u_int *numprompts, char ***prompts, u_int **echo_on)
739: {
740: Buffer m;
1.21 markus 741: u_int success;
1.1 provos 742: char *challenge;
743:
1.8 markus 744: debug3("%s: entering", __func__);
1.1 provos 745:
746: buffer_init(&m);
1.7 mouring 747: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 748:
1.7 mouring 749: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 750: &m);
1.21 markus 751: success = buffer_get_int(&m);
752: if (success == 0) {
1.8 markus 753: debug3("%s: no challenge", __func__);
1.1 provos 754: buffer_free(&m);
755: return (-1);
756: }
757:
758: /* Get the challenge, and format the response */
759: challenge = buffer_get_string(&m, NULL);
760: buffer_free(&m);
761:
762: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
763: (*prompts)[0] = challenge;
764:
1.8 markus 765: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 766:
767: return (0);
768: }
769:
770: int
771: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
772: {
773: Buffer m;
774: int authok;
775:
1.8 markus 776: debug3("%s: entering", __func__);
1.1 provos 777: if (numresponses != 1)
778: return (-1);
779:
780: buffer_init(&m);
781: buffer_put_cstring(&m, responses[0]);
1.7 mouring 782: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 783:
1.7 mouring 784: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 785: MONITOR_ANS_BSDAUTHRESPOND, &m);
786:
787: authok = buffer_get_int(&m);
788: buffer_free(&m);
789:
790: return ((authok == 0) ? -1 : 0);
791: }
792:
1.38 dtucker 793: #ifdef SKEY
1.1 provos 794: int
795: mm_skey_query(void *ctx, char **name, char **infotxt,
796: u_int *numprompts, char ***prompts, u_int **echo_on)
797: {
798: Buffer m;
1.21 markus 799: int len;
800: u_int success;
1.1 provos 801: char *p, *challenge;
802:
1.8 markus 803: debug3("%s: entering", __func__);
1.1 provos 804:
805: buffer_init(&m);
1.7 mouring 806: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1.1 provos 807:
1.7 mouring 808: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1.1 provos 809: &m);
1.21 markus 810: success = buffer_get_int(&m);
811: if (success == 0) {
1.8 markus 812: debug3("%s: no challenge", __func__);
1.1 provos 813: buffer_free(&m);
814: return (-1);
815: }
816:
817: /* Get the challenge, and format the response */
818: challenge = buffer_get_string(&m, NULL);
819: buffer_free(&m);
820:
1.8 markus 821: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 822:
823: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
824:
1.43 djm 825: xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1.1 provos 826: xfree(challenge);
827:
828: return (0);
829: }
830:
831: int
832: mm_skey_respond(void *ctx, u_int numresponses, char **responses)
833: {
834: Buffer m;
835: int authok;
836:
1.8 markus 837: debug3("%s: entering", __func__);
1.1 provos 838: if (numresponses != 1)
839: return (-1);
840:
841: buffer_init(&m);
842: buffer_put_cstring(&m, responses[0]);
1.7 mouring 843: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1.1 provos 844:
1.7 mouring 845: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 846: MONITOR_ANS_SKEYRESPOND, &m);
847:
848: authok = buffer_get_int(&m);
849: buffer_free(&m);
850:
851: return ((authok == 0) ? -1 : 0);
852: }
1.38 dtucker 853: #endif /* SKEY */
1.1 provos 854:
855: void
856: mm_ssh1_session_id(u_char session_id[16])
857: {
858: Buffer m;
859: int i;
860:
1.8 markus 861: debug3("%s entering", __func__);
1.1 provos 862:
863: buffer_init(&m);
864: for (i = 0; i < 16; i++)
865: buffer_put_char(&m, session_id[i]);
866:
1.7 mouring 867: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 868: buffer_free(&m);
869: }
870:
871: int
872: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
873: {
874: Buffer m;
875: Key *key;
876: u_char *blob;
877: u_int blen;
1.22 markus 878: int allowed = 0, have_forced = 0;
1.1 provos 879:
1.8 markus 880: debug3("%s entering", __func__);
1.1 provos 881:
882: buffer_init(&m);
883: buffer_put_bignum2(&m, client_n);
884:
1.7 mouring 885: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
886: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 887:
888: allowed = buffer_get_int(&m);
1.22 markus 889:
890: /* fake forced command */
891: auth_clear_options();
892: have_forced = buffer_get_int(&m);
893: forced_command = have_forced ? xstrdup("true") : NULL;
1.1 provos 894:
895: if (allowed && rkey != NULL) {
896: blob = buffer_get_string(&m, &blen);
897: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 898: fatal("%s: key_from_blob failed", __func__);
1.1 provos 899: *rkey = key;
900: xfree(blob);
901: }
902: mm_send_debug(&m);
903: buffer_free(&m);
904:
905: return (allowed);
906: }
907:
908: BIGNUM *
909: mm_auth_rsa_generate_challenge(Key *key)
910: {
911: Buffer m;
912: BIGNUM *challenge;
913: u_char *blob;
914: u_int blen;
915:
1.8 markus 916: debug3("%s entering", __func__);
1.1 provos 917:
918: if ((challenge = BN_new()) == NULL)
1.8 markus 919: fatal("%s: BN_new failed", __func__);
1.1 provos 920:
921: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
922: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 923: fatal("%s: key_to_blob failed", __func__);
1.1 provos 924: key->type = KEY_RSA1;
925:
926: buffer_init(&m);
927: buffer_put_string(&m, blob, blen);
928: xfree(blob);
929:
1.7 mouring 930: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
931: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 932:
933: buffer_get_bignum2(&m, challenge);
934: buffer_free(&m);
935:
936: return (challenge);
937: }
938:
939: int
940: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
941: {
942: Buffer m;
943: u_char *blob;
944: u_int blen;
945: int success = 0;
946:
1.8 markus 947: debug3("%s entering", __func__);
1.1 provos 948:
949: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
950: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 951: fatal("%s: key_to_blob failed", __func__);
1.1 provos 952: key->type = KEY_RSA1;
953:
954: buffer_init(&m);
955: buffer_put_string(&m, blob, blen);
956: buffer_put_string(&m, response, 16);
957: xfree(blob);
958:
1.7 mouring 959: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
960: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 961:
962: success = buffer_get_int(&m);
963: buffer_free(&m);
964:
965: return (success);
966: }
1.29 markus 967:
968: #ifdef GSSAPI
969: OM_uint32
1.36 avsm 970: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 971: {
972: Buffer m;
973: OM_uint32 major;
974:
975: /* Client doesn't get to see the context */
976: *ctx = NULL;
977:
978: buffer_init(&m);
1.36 avsm 979: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 980:
981: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
982: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
983:
984: major = buffer_get_int(&m);
985:
986: buffer_free(&m);
987: return (major);
988: }
989:
990: OM_uint32
991: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
992: gss_buffer_desc *out, OM_uint32 *flags)
993: {
994: Buffer m;
995: OM_uint32 major;
1.30 deraadt 996: u_int len;
1.29 markus 997:
998: buffer_init(&m);
999: buffer_put_string(&m, in->value, in->length);
1000:
1001: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1002: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1003:
1004: major = buffer_get_int(&m);
1.30 deraadt 1005: out->value = buffer_get_string(&m, &len);
1006: out->length = len;
1.29 markus 1007: if (flags)
1008: *flags = buffer_get_int(&m);
1009:
1010: buffer_free(&m);
1011:
1012: return (major);
1.35 markus 1013: }
1014:
1015: OM_uint32
1016: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1017: {
1018: Buffer m;
1019: OM_uint32 major;
1020:
1021: buffer_init(&m);
1022: buffer_put_string(&m, gssbuf->value, gssbuf->length);
1023: buffer_put_string(&m, gssmic->value, gssmic->length);
1024:
1025: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1026: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1027: &m);
1028:
1029: major = buffer_get_int(&m);
1030: buffer_free(&m);
1031: return(major);
1.29 markus 1032: }
1033:
1034: int
1035: mm_ssh_gssapi_userok(char *user)
1036: {
1037: Buffer m;
1038: int authenticated = 0;
1039:
1040: buffer_init(&m);
1041:
1042: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1043: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1044: &m);
1045:
1046: authenticated = buffer_get_int(&m);
1047:
1048: buffer_free(&m);
1049: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1050: return (authenticated);
1051: }
1052: #endif /* GSSAPI */
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