monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.67 2009/05/28 16:50:16 andreas Exp $ */
   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
  30 #include <sys/types.h>
  31 #include <sys/uio.h>
  32
  33 #include <errno.h>
  34 #include <pwd.h>
  35 #include <signal.h>
  36 #include <stdarg.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 #include <openssl/bn.h>
  42 #include <openssl/dh.h>
  43 #include <openssl/evp.h>
  44
  45 #include "openbsd-compat/sys-queue.h"
  46 #include "xmalloc.h"
  47 #include "ssh.h"
  48 #include "dh.h"
  49 #include "buffer.h"
  50 #include "key.h"
  51 #include "cipher.h"
  52 #include "kex.h"
  53 #include "hostfile.h"
  54 #include "auth.h"
  55 #include "auth-options.h"
  56 #include "packet.h"
  57 #include "mac.h"
  58 #include "log.h"
  59 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  60 #undef TARGET_OS_MAC
  61 #include "zlib.h"
  62 #define TARGET_OS_MAC 1
  63 #else
  64 #include "zlib.h"
  65 #endif
  66 #include "monitor.h"
  67 #ifdef GSSAPI
  68 #include "ssh-gss.h"
  69 #endif
  70 #include "monitor_wrap.h"
  71 #include "atomicio.h"
  72 #include "monitor_fdpass.h"
  73 #include "misc.h"
  74 #include "schnorr.h"
  75 #include "jpake.h"
  76
  77 #include "channels.h"
  78 #include "session.h"
  79 #include "servconf.h"
  80 #include "roaming.h"
  81
  82 /* Imports */
  83 extern int compat20;
  84 extern z_stream incoming_stream;
  85 extern z_stream outgoing_stream;
  86 extern struct monitor *pmonitor;
  87 extern Buffer loginmsg;
  88 extern ServerOptions options;
  89
  90 int
  91 mm_is_monitor(void)
  92 {
  93         /*
  94          * m_pid is only set in the privileged part, and
  95          * points to the unprivileged child.
  96          */
  97         return (pmonitor && pmonitor->m_pid > 0);
  98 }
  99
 100 void
 101 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
 102 {
 103         u_int mlen = buffer_len(m);
 104         u_char buf[5];
 105
 106         debug3("%s entering: type %d", __func__, type);
 107
 108         put_u32(buf, mlen + 1);
 109         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 110         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 111                 fatal("%s: write: %s", __func__, strerror(errno));
 112         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 113                 fatal("%s: write: %s", __func__, strerror(errno));
 114 }
 115
 116 void
 117 mm_request_receive(int sock, Buffer *m)
 118 {
 119         u_char buf[4];
 120         u_int msg_len;
 121
 122         debug3("%s entering", __func__);
 123
 124         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 125                 if (errno == EPIPE)
 126                         cleanup_exit(255);
 127                 fatal("%s: read: %s", __func__, strerror(errno));
 128         }
 129         msg_len = get_u32(buf);
 130         if (msg_len > 256 * 1024)
 131                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 132         buffer_clear(m);
 133         buffer_append_space(m, msg_len);
 134         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 135                 fatal("%s: read: %s", __func__, strerror(errno));
 136 }
 137
 138 void
 139 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 140 {
 141         u_char rtype;
 142
 143         debug3("%s entering: type %d", __func__, type);
 144
 145         mm_request_receive(sock, m);
 146         rtype = buffer_get_char(m);
 147         if (rtype != type)
 148                 fatal("%s: read: rtype %d != type %d", __func__,
 149                     rtype, type);
 150 }
 151
 152 DH *
 153 mm_choose_dh(int min, int nbits, int max)
 154 {
 155         BIGNUM *p, *g;
 156         int success = 0;
 157         Buffer m;
 158
 159         buffer_init(&m);
 160         buffer_put_int(&m, min);
 161         buffer_put_int(&m, nbits);
 162         buffer_put_int(&m, max);
 163
 164         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 165
 166         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 167         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 168
 169         success = buffer_get_char(&m);
 170         if (success == 0)
 171                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 172
 173         if ((p = BN_new()) == NULL)
 174                 fatal("%s: BN_new failed", __func__);
 175         if ((g = BN_new()) == NULL)
 176                 fatal("%s: BN_new failed", __func__);
 177         buffer_get_bignum2(&m, p);
 178         buffer_get_bignum2(&m, g);
 179
 180         debug3("%s: remaining %d", __func__, buffer_len(&m));
 181         buffer_free(&m);
 182
 183         return (dh_new_group(g, p));
 184 }
 185
 186 int
 187 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 188 {
 189         Kex *kex = *pmonitor->m_pkex;
 190         Buffer m;
 191
 192         debug3("%s entering", __func__);
 193
 194         buffer_init(&m);
 195         buffer_put_int(&m, kex->host_key_index(key));
 196         buffer_put_string(&m, data, datalen);
 197
 198         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 199
 200         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 201         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 202         *sigp  = buffer_get_string(&m, lenp);
 203         buffer_free(&m);
 204
 205         return (0);
 206 }
 207
 208 struct passwd *
 209 mm_getpwnamallow(const char *username)
 210 {
 211         Buffer m;
 212         struct passwd *pw;
 213         u_int len;
 214         ServerOptions *newopts;
 215
 216         debug3("%s entering", __func__);
 217
 218         buffer_init(&m);
 219         buffer_put_cstring(&m, username);
 220
 221         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 222
 223         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 224         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 225
 226         if (buffer_get_char(&m) == 0) {
 227                 pw = NULL;
 228                 goto out;
 229         }
 230         pw = buffer_get_string(&m, &len);
 231         if (len != sizeof(struct passwd))
 232                 fatal("%s: struct passwd size mismatch", __func__);
 233         pw->pw_name = buffer_get_string(&m, NULL);
 234         pw->pw_passwd = buffer_get_string(&m, NULL);
 235         pw->pw_gecos = buffer_get_string(&m, NULL);
 236 #ifdef HAVE_PW_CLASS_IN_PASSWD
 237         pw->pw_class = buffer_get_string(&m, NULL);
 238 #endif
 239         pw->pw_dir = buffer_get_string(&m, NULL);
 240         pw->pw_shell = buffer_get_string(&m, NULL);
 241
 242 out:
 243         /* copy options block as a Match directive may have changed some */
 244         newopts = buffer_get_string(&m, &len);
 245         if (len != sizeof(*newopts))
 246                 fatal("%s: option block size mismatch", __func__);
 247         if (newopts->banner != NULL)
 248                 newopts->banner = buffer_get_string(&m, NULL);
 249         copy_set_server_options(&options, newopts, 1);
 250         xfree(newopts);
 251
 252         buffer_free(&m);
 253
 254         return (pw);
 255 }
 256
 257 char *
 258 mm_auth2_read_banner(void)
 259 {
 260         Buffer m;
 261         char *banner;
 262
 263         debug3("%s entering", __func__);
 264
 265         buffer_init(&m);
 266         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 267         buffer_clear(&m);
 268
 269         mm_request_receive_expect(pmonitor->m_recvfd,
 270             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 271         banner = buffer_get_string(&m, NULL);
 272         buffer_free(&m);
 273
 274         /* treat empty banner as missing banner */
 275         if (strlen(banner) == 0) {
 276                 xfree(banner);
 277                 banner = NULL;
 278         }
 279         return (banner);
 280 }
 281
 282 /* Inform the privileged process about service and style */
 283
 284 void
 285 mm_inform_authserv(char *service, char *style)
 286 {
 287         Buffer m;
 288
 289         debug3("%s entering", __func__);
 290
 291         buffer_init(&m);
 292         buffer_put_cstring(&m, service);
 293         buffer_put_cstring(&m, style ? style : "");
 294
 295         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 296
 297         buffer_free(&m);
 298 }
 299
 300 /* Do the password authentication */
 301 int
 302 mm_auth_password(Authctxt *authctxt, char *password)
 303 {
 304         Buffer m;
 305         int authenticated = 0;
 306
 307         debug3("%s entering", __func__);
 308
 309         buffer_init(&m);
 310         buffer_put_cstring(&m, password);
 311         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 312
 313         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 314         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 315
 316         authenticated = buffer_get_int(&m);
 317
 318         buffer_free(&m);
 319
 320         debug3("%s: user %sauthenticated",
 321             __func__, authenticated ? "" : "not ");
 322         return (authenticated);
 323 }
 324
 325 int
 326 mm_user_key_allowed(struct passwd *pw, Key *key)
 327 {
 328         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 329 }
 330
 331 int
 332 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 333     Key *key)
 334 {
 335         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 336 }
 337
 338 int
 339 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 340     char *host, Key *key)
 341 {
 342         int ret;
 343
 344         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 345         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 346         key->type = KEY_RSA1;
 347         return (ret);
 348 }
 349
 350 static void
 351 mm_send_debug(Buffer *m)
 352 {
 353         char *msg;
 354
 355         while (buffer_len(m)) {
 356                 msg = buffer_get_string(m, NULL);
 357                 debug3("%s: Sending debug: %s", __func__, msg);
 358                 packet_send_debug("%s", msg);
 359                 xfree(msg);
 360         }
 361 }
 362
 363 int
 364 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 365 {
 366         Buffer m;
 367         u_char *blob;
 368         u_int len;
 369         int allowed = 0, have_forced = 0;
 370
 371         debug3("%s entering", __func__);
 372
 373         /* Convert the key to a blob and the pass it over */
 374         if (!key_to_blob(key, &blob, &len))
 375                 return (0);
 376
 377         buffer_init(&m);
 378         buffer_put_int(&m, type);
 379         buffer_put_cstring(&m, user ? user : "");
 380         buffer_put_cstring(&m, host ? host : "");
 381         buffer_put_string(&m, blob, len);
 382         xfree(blob);
 383
 384         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 385
 386         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 387         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 388
 389         allowed = buffer_get_int(&m);
 390
 391         /* fake forced command */
 392         auth_clear_options();
 393         have_forced = buffer_get_int(&m);
 394         forced_command = have_forced ? xstrdup("true") : NULL;
 395
 396         /* Send potential debug messages */
 397         mm_send_debug(&m);
 398
 399         buffer_free(&m);
 400
 401         return (allowed);
 402 }
 403
 404 /*
 405  * This key verify needs to send the key type along, because the
 406  * privileged parent makes the decision if the key is allowed
 407  * for authentication.
 408  */
 409
 410 int
 411 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 412 {
 413         Buffer m;
 414         u_char *blob;
 415         u_int len;
 416         int verified = 0;
 417
 418         debug3("%s entering", __func__);
 419
 420         /* Convert the key to a blob and the pass it over */
 421         if (!key_to_blob(key, &blob, &len))
 422                 return (0);
 423
 424         buffer_init(&m);
 425         buffer_put_string(&m, blob, len);
 426         buffer_put_string(&m, sig, siglen);
 427         buffer_put_string(&m, data, datalen);
 428         xfree(blob);
 429
 430         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 431
 432         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 433         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 434
 435         verified = buffer_get_int(&m);
 436
 437         buffer_free(&m);
 438
 439         return (verified);
 440 }
 441
 442 /* Export key state after authentication */
 443 Newkeys *
 444 mm_newkeys_from_blob(u_char *blob, int blen)
 445 {
 446         Buffer b;
 447         u_int len;
 448         Newkeys *newkey = NULL;
 449         Enc *enc;
 450         Mac *mac;
 451         Comp *comp;
 452
 453         debug3("%s: %p(%d)", __func__, blob, blen);
 454 #ifdef DEBUG_PK
 455         dump_base64(stderr, blob, blen);
 456 #endif
 457         buffer_init(&b);
 458         buffer_append(&b, blob, blen);
 459
 460         newkey = xmalloc(sizeof(*newkey));
 461         enc = &newkey->enc;
 462         mac = &newkey->mac;
 463         comp = &newkey->comp;
 464
 465         /* Enc structure */
 466         enc->name = buffer_get_string(&b, NULL);
 467         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 468         enc->enabled = buffer_get_int(&b);
 469         enc->block_size = buffer_get_int(&b);
 470         enc->key = buffer_get_string(&b, &enc->key_len);
 471         enc->iv = buffer_get_string(&b, &len);
 472         if (len != enc->block_size)
 473                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 474                     enc->block_size, len);
 475
 476         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 477                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 478                     enc->name, enc->cipher);
 479
 480         /* Mac structure */
 481         mac->name = buffer_get_string(&b, NULL);
 482         if (mac->name == NULL || mac_setup(mac, mac->name) == -1)
 483                 fatal("%s: can not setup mac %s", __func__, mac->name);
 484         mac->enabled = buffer_get_int(&b);
 485         mac->key = buffer_get_string(&b, &len);
 486         if (len > mac->key_len)
 487                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 488                     mac->key_len);
 489         mac->key_len = len;
 490
 491         /* Comp structure */
 492         comp->type = buffer_get_int(&b);
 493         comp->enabled = buffer_get_int(&b);
 494         comp->name = buffer_get_string(&b, NULL);
 495
 496         len = buffer_len(&b);
 497         if (len != 0)
 498                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 499         buffer_free(&b);
 500         return (newkey);
 501 }
 502
 503 int
 504 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 505 {
 506         Buffer b;
 507         int len;
 508         Enc *enc;
 509         Mac *mac;
 510         Comp *comp;
 511         Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode);
 512
 513         debug3("%s: converting %p", __func__, newkey);
 514
 515         if (newkey == NULL) {
 516                 error("%s: newkey == NULL", __func__);
 517                 return 0;
 518         }
 519         enc = &newkey->enc;
 520         mac = &newkey->mac;
 521         comp = &newkey->comp;
 522
 523         buffer_init(&b);
 524         /* Enc structure */
 525         buffer_put_cstring(&b, enc->name);
 526         /* The cipher struct is constant and shared, you export pointer */
 527         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 528         buffer_put_int(&b, enc->enabled);
 529         buffer_put_int(&b, enc->block_size);
 530         buffer_put_string(&b, enc->key, enc->key_len);
 531         packet_get_keyiv(mode, enc->iv, enc->block_size);
 532         buffer_put_string(&b, enc->iv, enc->block_size);
 533
 534         /* Mac structure */
 535         buffer_put_cstring(&b, mac->name);
 536         buffer_put_int(&b, mac->enabled);
 537         buffer_put_string(&b, mac->key, mac->key_len);
 538
 539         /* Comp structure */
 540         buffer_put_int(&b, comp->type);
 541         buffer_put_int(&b, comp->enabled);
 542         buffer_put_cstring(&b, comp->name);
 543
 544         len = buffer_len(&b);
 545         if (lenp != NULL)
 546                 *lenp = len;
 547         if (blobp != NULL) {
 548                 *blobp = xmalloc(len);
 549                 memcpy(*blobp, buffer_ptr(&b), len);
 550         }
 551         memset(buffer_ptr(&b), 0, len);
 552         buffer_free(&b);
 553         return len;
 554 }
 555
 556 static void
 557 mm_send_kex(Buffer *m, Kex *kex)
 558 {
 559         buffer_put_string(m, kex->session_id, kex->session_id_len);
 560         buffer_put_int(m, kex->we_need);
 561         buffer_put_int(m, kex->hostkey_type);
 562         buffer_put_int(m, kex->kex_type);
 563         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 564         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 565         buffer_put_int(m, kex->flags);
 566         buffer_put_cstring(m, kex->client_version_string);
 567         buffer_put_cstring(m, kex->server_version_string);
 568 }
 569
 570 void
 571 mm_send_keystate(struct monitor *monitor)
 572 {
 573         Buffer m, *input, *output;
 574         u_char *blob, *p;
 575         u_int bloblen, plen;
 576         u_int32_t seqnr, packets;
 577         u_int64_t blocks, bytes;
 578
 579         buffer_init(&m);
 580
 581         if (!compat20) {
 582                 u_char iv[24];
 583                 u_char *key;
 584                 u_int ivlen, keylen;
 585
 586                 buffer_put_int(&m, packet_get_protocol_flags());
 587
 588                 buffer_put_int(&m, packet_get_ssh1_cipher());
 589
 590                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 591                 keylen = packet_get_encryption_key(NULL);
 592                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 593                 keylen = packet_get_encryption_key(key);
 594                 buffer_put_string(&m, key, keylen);
 595                 memset(key, 0, keylen);
 596                 xfree(key);
 597
 598                 ivlen = packet_get_keyiv_len(MODE_OUT);
 599                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 600                 buffer_put_string(&m, iv, ivlen);
 601                 ivlen = packet_get_keyiv_len(MODE_OUT);
 602                 packet_get_keyiv(MODE_IN, iv, ivlen);
 603                 buffer_put_string(&m, iv, ivlen);
 604                 goto skip;
 605         } else {
 606                 /* Kex for rekeying */
 607                 mm_send_kex(&m, *monitor->m_pkex);
 608         }
 609
 610         debug3("%s: Sending new keys: %p %p",
 611             __func__, packet_get_newkeys(MODE_OUT),
 612             packet_get_newkeys(MODE_IN));
 613
 614         /* Keys from Kex */
 615         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 616                 fatal("%s: conversion of newkeys failed", __func__);
 617
 618         buffer_put_string(&m, blob, bloblen);
 619         xfree(blob);
 620
 621         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 622                 fatal("%s: conversion of newkeys failed", __func__);
 623
 624         buffer_put_string(&m, blob, bloblen);
 625         xfree(blob);
 626
 627         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes);
 628         buffer_put_int(&m, seqnr);
 629         buffer_put_int64(&m, blocks);
 630         buffer_put_int(&m, packets);
 631         buffer_put_int64(&m, bytes);
 632         packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes);
 633         buffer_put_int(&m, seqnr);
 634         buffer_put_int64(&m, blocks);
 635         buffer_put_int(&m, packets);
 636         buffer_put_int64(&m, bytes);
 637
 638         debug3("%s: New keys have been sent", __func__);
 639  skip:
 640         /* More key context */
 641         plen = packet_get_keycontext(MODE_OUT, NULL);
 642         p = xmalloc(plen+1);
 643         packet_get_keycontext(MODE_OUT, p);
 644         buffer_put_string(&m, p, plen);
 645         xfree(p);
 646
 647         plen = packet_get_keycontext(MODE_IN, NULL);
 648         p = xmalloc(plen+1);
 649         packet_get_keycontext(MODE_IN, p);
 650         buffer_put_string(&m, p, plen);
 651         xfree(p);
 652
 653         /* Compression state */
 654         debug3("%s: Sending compression state", __func__);
 655         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 656         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 657
 658         /* Network I/O buffers */
 659         input = (Buffer *)packet_get_input();
 660         output = (Buffer *)packet_get_output();
 661         buffer_put_string(&m, buffer_ptr(input), buffer_len(input));
 662         buffer_put_string(&m, buffer_ptr(output), buffer_len(output));
 663
 664         /* Roaming */
 665         if (compat20) {
 666                 buffer_put_int64(&m, get_sent_bytes());
 667                 buffer_put_int64(&m, get_recv_bytes());
 668         }
 669
 670         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 671         debug3("%s: Finished sending state", __func__);
 672
 673         buffer_free(&m);
 674 }
 675
 676 int
 677 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 678 {
 679         Buffer m;
 680         char *p, *msg;
 681         int success = 0, tmp1 = -1, tmp2 = -1;
 682
 683         /* Kludge: ensure there are fds free to receive the pty/tty */
 684         if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
 685             (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
 686                 error("%s: cannot allocate fds for pty", __func__);
 687                 if (tmp1 > 0)
 688                         close(tmp1);
 689                 if (tmp2 > 0)
 690                         close(tmp2);
 691                 return 0;
 692         }
 693         close(tmp1);
 694         close(tmp2);
 695
 696         buffer_init(&m);
 697         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 698
 699         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 700         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 701
 702         success = buffer_get_int(&m);
 703         if (success == 0) {
 704                 debug3("%s: pty alloc failed", __func__);
 705                 buffer_free(&m);
 706                 return (0);
 707         }
 708         p = buffer_get_string(&m, NULL);
 709         msg = buffer_get_string(&m, NULL);
 710         buffer_free(&m);
 711
 712         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 713         xfree(p);
 714
 715         buffer_append(&loginmsg, msg, strlen(msg));
 716         xfree(msg);
 717
 718         if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
 719             (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
 720                 fatal("%s: receive fds failed", __func__);
 721
 722         /* Success */
 723         return (1);
 724 }
 725
 726 void
 727 mm_session_pty_cleanup2(Session *s)
 728 {
 729         Buffer m;
 730
 731         if (s->ttyfd == -1)
 732                 return;
 733         buffer_init(&m);
 734         buffer_put_cstring(&m, s->tty);
 735         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 736         buffer_free(&m);
 737
 738         /* closed dup'ed master */
 739         if (s->ptymaster != -1 && close(s->ptymaster) < 0)
 740                 error("close(s->ptymaster/%d): %s",
 741                     s->ptymaster, strerror(errno));
 742
 743         /* unlink pty from session */
 744         s->ttyfd = -1;
 745 }
 746
 747 #ifdef USE_PAM
 748 void
 749 mm_start_pam(Authctxt *authctxt)
 750 {
 751         Buffer m;
 752
 753         debug3("%s entering", __func__);
 754         if (!options.use_pam)
 755                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 756
 757         buffer_init(&m);
 758         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 759
 760         buffer_free(&m);
 761 }
 762
 763 u_int
 764 mm_do_pam_account(void)
 765 {
 766         Buffer m;
 767         u_int ret;
 768         char *msg;
 769
 770         debug3("%s entering", __func__);
 771         if (!options.use_pam)
 772                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 773
 774         buffer_init(&m);
 775         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 776
 777         mm_request_receive_expect(pmonitor->m_recvfd,
 778             MONITOR_ANS_PAM_ACCOUNT, &m);
 779         ret = buffer_get_int(&m);
 780         msg = buffer_get_string(&m, NULL);
 781         buffer_append(&loginmsg, msg, strlen(msg));
 782         xfree(msg);
 783
 784         buffer_free(&m);
 785
 786         debug3("%s returning %d", __func__, ret);
 787
 788         return (ret);
 789 }
 790
 791 void *
 792 mm_sshpam_init_ctx(Authctxt *authctxt)
 793 {
 794         Buffer m;
 795         int success;
 796
 797         debug3("%s", __func__);
 798         buffer_init(&m);
 799         buffer_put_cstring(&m, authctxt->user);
 800         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 801         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 802         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 803         success = buffer_get_int(&m);
 804         if (success == 0) {
 805                 debug3("%s: pam_init_ctx failed", __func__);
 806                 buffer_free(&m);
 807                 return (NULL);
 808         }
 809         buffer_free(&m);
 810         return (authctxt);
 811 }
 812
 813 int
 814 mm_sshpam_query(void *ctx, char **name, char **info,
 815     u_int *num, char ***prompts, u_int **echo_on)
 816 {
 817         Buffer m;
 818         u_int i;
 819         int ret;
 820
 821         debug3("%s", __func__);
 822         buffer_init(&m);
 823         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 824         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 825         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 826         ret = buffer_get_int(&m);
 827         debug3("%s: pam_query returned %d", __func__, ret);
 828         *name = buffer_get_string(&m, NULL);
 829         *info = buffer_get_string(&m, NULL);
 830         *num = buffer_get_int(&m);
 831         if (*num > PAM_MAX_NUM_MSG)
 832                 fatal("%s: recieved %u PAM messages, expected <= %u",
 833                     __func__, *num, PAM_MAX_NUM_MSG);
 834         *prompts = xcalloc((*num + 1), sizeof(char *));
 835         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 836         for (i = 0; i < *num; ++i) {
 837                 (*prompts)[i] = buffer_get_string(&m, NULL);
 838                 (*echo_on)[i] = buffer_get_int(&m);
 839         }
 840         buffer_free(&m);
 841         return (ret);
 842 }
 843
 844 int
 845 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 846 {
 847         Buffer m;
 848         u_int i;
 849         int ret;
 850
 851         debug3("%s", __func__);
 852         buffer_init(&m);
 853         buffer_put_int(&m, num);
 854         for (i = 0; i < num; ++i)
 855                 buffer_put_cstring(&m, resp[i]);
 856         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 857         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 858         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 859         ret = buffer_get_int(&m);
 860         debug3("%s: pam_respond returned %d", __func__, ret);
 861         buffer_free(&m);
 862         return (ret);
 863 }
 864
 865 void
 866 mm_sshpam_free_ctx(void *ctxtp)
 867 {
 868         Buffer m;
 869
 870         debug3("%s", __func__);
 871         buffer_init(&m);
 872         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 873         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 874         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 875         buffer_free(&m);
 876 }
 877 #endif /* USE_PAM */
 878
 879 /* Request process termination */
 880
 881 void
 882 mm_terminate(void)
 883 {
 884         Buffer m;
 885
 886         buffer_init(&m);
 887         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 888         buffer_free(&m);
 889 }
 890
 891 int
 892 mm_ssh1_session_key(BIGNUM *num)
 893 {
 894         int rsafail;
 895         Buffer m;
 896
 897         buffer_init(&m);
 898         buffer_put_bignum2(&m, num);
 899         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 900
 901         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 902
 903         rsafail = buffer_get_int(&m);
 904         buffer_get_bignum2(&m, num);
 905
 906         buffer_free(&m);
 907
 908         return (rsafail);
 909 }
 910
 911 static void
 912 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 913     char ***prompts, u_int **echo_on)
 914 {
 915         *name = xstrdup("");
 916         *infotxt = xstrdup("");
 917         *numprompts = 1;
 918         *prompts = xcalloc(*numprompts, sizeof(char *));
 919         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 920         (*echo_on)[0] = 0;
 921 }
 922
 923 int
 924 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 925    u_int *numprompts, char ***prompts, u_int **echo_on)
 926 {
 927         Buffer m;
 928         u_int success;
 929         char *challenge;
 930
 931         debug3("%s: entering", __func__);
 932
 933         buffer_init(&m);
 934         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 935
 936         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 937             &m);
 938         success = buffer_get_int(&m);
 939         if (success == 0) {
 940                 debug3("%s: no challenge", __func__);
 941                 buffer_free(&m);
 942                 return (-1);
 943         }
 944
 945         /* Get the challenge, and format the response */
 946         challenge  = buffer_get_string(&m, NULL);
 947         buffer_free(&m);
 948
 949         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 950         (*prompts)[0] = challenge;
 951
 952         debug3("%s: received challenge: %s", __func__, challenge);
 953
 954         return (0);
 955 }
 956
 957 int
 958 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 959 {
 960         Buffer m;
 961         int authok;
 962
 963         debug3("%s: entering", __func__);
 964         if (numresponses != 1)
 965                 return (-1);
 966
 967         buffer_init(&m);
 968         buffer_put_cstring(&m, responses[0]);
 969         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 970
 971         mm_request_receive_expect(pmonitor->m_recvfd,
 972             MONITOR_ANS_BSDAUTHRESPOND, &m);
 973
 974         authok = buffer_get_int(&m);
 975         buffer_free(&m);
 976
 977         return ((authok == 0) ? -1 : 0);
 978 }
 979
 980 #ifdef SKEY
 981 int
 982 mm_skey_query(void *ctx, char **name, char **infotxt,
 983    u_int *numprompts, char ***prompts, u_int **echo_on)
 984 {
 985         Buffer m;
 986         u_int success;
 987         char *challenge;
 988
 989         debug3("%s: entering", __func__);
 990
 991         buffer_init(&m);
 992         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 993
 994         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 995             &m);
 996         success = buffer_get_int(&m);
 997         if (success == 0) {
 998                 debug3("%s: no challenge", __func__);
 999                 buffer_free(&m);
1000                 return (-1);
1001         }
1002
1003         /* Get the challenge, and format the response */
1004         challenge  = buffer_get_string(&m, NULL);
1005         buffer_free(&m);
1006
1007         debug3("%s: received challenge: %s", __func__, challenge);
1008
1009         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
1010
1011         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1012         xfree(challenge);
1013
1014         return (0);
1015 }
1016
1017 int
1018 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
1019 {
1020         Buffer m;
1021         int authok;
1022
1023         debug3("%s: entering", __func__);
1024         if (numresponses != 1)
1025                 return (-1);
1026
1027         buffer_init(&m);
1028         buffer_put_cstring(&m, responses[0]);
1029         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1030
1031         mm_request_receive_expect(pmonitor->m_recvfd,
1032             MONITOR_ANS_SKEYRESPOND, &m);
1033
1034         authok = buffer_get_int(&m);
1035         buffer_free(&m);
1036
1037         return ((authok == 0) ? -1 : 0);
1038 }
1039 #endif /* SKEY */
1040
1041 void
1042 mm_ssh1_session_id(u_char session_id[16])
1043 {
1044         Buffer m;
1045         int i;
1046
1047         debug3("%s entering", __func__);
1048
1049         buffer_init(&m);
1050         for (i = 0; i < 16; i++)
1051                 buffer_put_char(&m, session_id[i]);
1052
1053         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1054         buffer_free(&m);
1055 }
1056
1057 int
1058 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1059 {
1060         Buffer m;
1061         Key *key;
1062         u_char *blob;
1063         u_int blen;
1064         int allowed = 0, have_forced = 0;
1065
1066         debug3("%s entering", __func__);
1067
1068         buffer_init(&m);
1069         buffer_put_bignum2(&m, client_n);
1070
1071         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1072         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1073
1074         allowed = buffer_get_int(&m);
1075
1076         /* fake forced command */
1077         auth_clear_options();
1078         have_forced = buffer_get_int(&m);
1079         forced_command = have_forced ? xstrdup("true") : NULL;
1080
1081         if (allowed && rkey != NULL) {
1082                 blob = buffer_get_string(&m, &blen);
1083                 if ((key = key_from_blob(blob, blen)) == NULL)
1084                         fatal("%s: key_from_blob failed", __func__);
1085                 *rkey = key;
1086                 xfree(blob);
1087         }
1088         mm_send_debug(&m);
1089         buffer_free(&m);
1090
1091         return (allowed);
1092 }
1093
1094 BIGNUM *
1095 mm_auth_rsa_generate_challenge(Key *key)
1096 {
1097         Buffer m;
1098         BIGNUM *challenge;
1099         u_char *blob;
1100         u_int blen;
1101
1102         debug3("%s entering", __func__);
1103
1104         if ((challenge = BN_new()) == NULL)
1105                 fatal("%s: BN_new failed", __func__);
1106
1107         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1108         if (key_to_blob(key, &blob, &blen) == 0)
1109                 fatal("%s: key_to_blob failed", __func__);
1110         key->type = KEY_RSA1;
1111
1112         buffer_init(&m);
1113         buffer_put_string(&m, blob, blen);
1114         xfree(blob);
1115
1116         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1117         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1118
1119         buffer_get_bignum2(&m, challenge);
1120         buffer_free(&m);
1121
1122         return (challenge);
1123 }
1124
1125 int
1126 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1127 {
1128         Buffer m;
1129         u_char *blob;
1130         u_int blen;
1131         int success = 0;
1132
1133         debug3("%s entering", __func__);
1134
1135         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1136         if (key_to_blob(key, &blob, &blen) == 0)
1137                 fatal("%s: key_to_blob failed", __func__);
1138         key->type = KEY_RSA1;
1139
1140         buffer_init(&m);
1141         buffer_put_string(&m, blob, blen);
1142         buffer_put_string(&m, response, 16);
1143         xfree(blob);
1144
1145         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1146         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1147
1148         success = buffer_get_int(&m);
1149         buffer_free(&m);
1150
1151         return (success);
1152 }
1153
1154 #ifdef SSH_AUDIT_EVENTS
1155 void
1156 mm_audit_event(ssh_audit_event_t event)
1157 {
1158         Buffer m;
1159
1160         debug3("%s entering", __func__);
1161
1162         buffer_init(&m);
1163         buffer_put_int(&m, event);
1164
1165         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1166         buffer_free(&m);
1167 }
1168
1169 void
1170 mm_audit_run_command(const char *command)
1171 {
1172         Buffer m;
1173
1174         debug3("%s entering command %s", __func__, command);
1175
1176         buffer_init(&m);
1177         buffer_put_cstring(&m, command);
1178
1179         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1180         buffer_free(&m);
1181 }
1182 #endif /* SSH_AUDIT_EVENTS */
1183
1184 #ifdef GSSAPI
1185 OM_uint32
1186 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1187 {
1188         Buffer m;
1189         OM_uint32 major;
1190
1191         /* Client doesn't get to see the context */
1192         *ctx = NULL;
1193
1194         buffer_init(&m);
1195         buffer_put_string(&m, goid->elements, goid->length);
1196
1197         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1198         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1199
1200         major = buffer_get_int(&m);
1201
1202         buffer_free(&m);
1203         return (major);
1204 }
1205
1206 OM_uint32
1207 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1208     gss_buffer_desc *out, OM_uint32 *flags)
1209 {
1210         Buffer m;
1211         OM_uint32 major;
1212         u_int len;
1213
1214         buffer_init(&m);
1215         buffer_put_string(&m, in->value, in->length);
1216
1217         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1218         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1219
1220         major = buffer_get_int(&m);
1221         out->value = buffer_get_string(&m, &len);
1222         out->length = len;
1223         if (flags)
1224                 *flags = buffer_get_int(&m);
1225
1226         buffer_free(&m);
1227
1228         return (major);
1229 }
1230
1231 OM_uint32
1232 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1233 {
1234         Buffer m;
1235         OM_uint32 major;
1236
1237         buffer_init(&m);
1238         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1239         buffer_put_string(&m, gssmic->value, gssmic->length);
1240
1241         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1242         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1243             &m);
1244
1245         major = buffer_get_int(&m);
1246         buffer_free(&m);
1247         return(major);
1248 }
1249
1250 int
1251 mm_ssh_gssapi_userok(char *user)
1252 {
1253         Buffer m;
1254         int authenticated = 0;
1255
1256         buffer_init(&m);
1257
1258         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1259         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1260                                   &m);
1261
1262         authenticated = buffer_get_int(&m);
1263
1264         buffer_free(&m);
1265         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1266         return (authenticated);
1267 }
1268 #endif /* GSSAPI */
1269
1270 #ifdef JPAKE
1271 void
1272 mm_auth2_jpake_get_pwdata(Authctxt *authctxt, BIGNUM **s,
1273     char **hash_scheme, char **salt)
1274 {
1275         Buffer m;
1276
1277         debug3("%s entering", __func__);
1278
1279         buffer_init(&m);
1280         mm_request_send(pmonitor->m_recvfd,
1281             MONITOR_REQ_JPAKE_GET_PWDATA, &m);
1282
1283         debug3("%s: waiting for MONITOR_ANS_JPAKE_GET_PWDATA", __func__);
1284         mm_request_receive_expect(pmonitor->m_recvfd,
1285             MONITOR_ANS_JPAKE_GET_PWDATA, &m);
1286
1287         *hash_scheme = buffer_get_string(&m, NULL);
1288         *salt = buffer_get_string(&m, NULL);
1289
1290         buffer_free(&m);
1291 }
1292
1293 void
1294 mm_jpake_step1(struct modp_group *grp,
1295     u_char **id, u_int *id_len,
1296     BIGNUM **priv1, BIGNUM **priv2, BIGNUM **g_priv1, BIGNUM **g_priv2,
1297     u_char **priv1_proof, u_int *priv1_proof_len,
1298     u_char **priv2_proof, u_int *priv2_proof_len)
1299 {
1300         Buffer m;
1301
1302         debug3("%s entering", __func__);
1303
1304         buffer_init(&m);
1305         mm_request_send(pmonitor->m_recvfd,
1306             MONITOR_REQ_JPAKE_STEP1, &m);
1307
1308         debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP1", __func__);
1309         mm_request_receive_expect(pmonitor->m_recvfd,
1310             MONITOR_ANS_JPAKE_STEP1, &m);
1311
1312         if ((*priv1 = BN_new()) == NULL ||
1313             (*priv2 = BN_new()) == NULL ||
1314             (*g_priv1 = BN_new()) == NULL ||
1315             (*g_priv2 = BN_new()) == NULL)
1316                 fatal("%s: BN_new", __func__);
1317
1318         *id = buffer_get_string(&m, id_len);
1319         /* priv1 and priv2 are, well, private */
1320         buffer_get_bignum2(&m, *g_priv1);
1321         buffer_get_bignum2(&m, *g_priv2);
1322         *priv1_proof = buffer_get_string(&m, priv1_proof_len);
1323         *priv2_proof = buffer_get_string(&m, priv2_proof_len);
1324
1325         buffer_free(&m);
1326 }
1327
1328 void
1329 mm_jpake_step2(struct modp_group *grp, BIGNUM *s,
1330     BIGNUM *mypub1, BIGNUM *theirpub1, BIGNUM *theirpub2, BIGNUM *mypriv2,
1331     const u_char *theirid, u_int theirid_len,
1332     const u_char *myid, u_int myid_len,
1333     const u_char *theirpub1_proof, u_int theirpub1_proof_len,
1334     const u_char *theirpub2_proof, u_int theirpub2_proof_len,
1335     BIGNUM **newpub,
1336     u_char **newpub_exponent_proof, u_int *newpub_exponent_proof_len)
1337 {
1338         Buffer m;
1339
1340         debug3("%s entering", __func__);
1341
1342         buffer_init(&m);
1343         /* monitor already has all bignums except theirpub1, theirpub2 */
1344         buffer_put_bignum2(&m, theirpub1);
1345         buffer_put_bignum2(&m, theirpub2);
1346         /* monitor already knows our id */
1347         buffer_put_string(&m, theirid, theirid_len);
1348         buffer_put_string(&m, theirpub1_proof, theirpub1_proof_len);
1349         buffer_put_string(&m, theirpub2_proof, theirpub2_proof_len);
1350
1351         mm_request_send(pmonitor->m_recvfd,
1352             MONITOR_REQ_JPAKE_STEP2, &m);
1353
1354         debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP2", __func__);
1355         mm_request_receive_expect(pmonitor->m_recvfd,
1356             MONITOR_ANS_JPAKE_STEP2, &m);
1357
1358         if ((*newpub = BN_new()) == NULL)
1359                 fatal("%s: BN_new", __func__);
1360
1361         buffer_get_bignum2(&m, *newpub);
1362         *newpub_exponent_proof = buffer_get_string(&m,
1363             newpub_exponent_proof_len);
1364
1365         buffer_free(&m);
1366 }
1367
1368 void
1369 mm_jpake_key_confirm(struct modp_group *grp, BIGNUM *s, BIGNUM *step2_val,
1370     BIGNUM *mypriv2, BIGNUM *mypub1, BIGNUM *mypub2,
1371     BIGNUM *theirpub1, BIGNUM *theirpub2,
1372     const u_char *my_id, u_int my_id_len,
1373     const u_char *their_id, u_int their_id_len,
1374     const u_char *sess_id, u_int sess_id_len,
1375     const u_char *theirpriv2_s_proof, u_int theirpriv2_s_proof_len,
1376     BIGNUM **k,
1377     u_char **confirm_hash, u_int *confirm_hash_len)
1378 {
1379         Buffer m;
1380
1381         debug3("%s entering", __func__);
1382
1383         buffer_init(&m);
1384         /* monitor already has all bignums except step2_val */
1385         buffer_put_bignum2(&m, step2_val);
1386         /* monitor already knows all the ids */
1387         buffer_put_string(&m, theirpriv2_s_proof, theirpriv2_s_proof_len);
1388
1389         mm_request_send(pmonitor->m_recvfd,
1390             MONITOR_REQ_JPAKE_KEY_CONFIRM, &m);
1391
1392         debug3("%s: waiting for MONITOR_ANS_JPAKE_KEY_CONFIRM", __func__);
1393         mm_request_receive_expect(pmonitor->m_recvfd,
1394             MONITOR_ANS_JPAKE_KEY_CONFIRM, &m);
1395
1396         /* 'k' is sensitive and stays in the monitor */
1397         *confirm_hash = buffer_get_string(&m, confirm_hash_len);
1398
1399         buffer_free(&m);
1400 }
1401
1402 int
1403 mm_jpake_check_confirm(const BIGNUM *k,
1404     const u_char *peer_id, u_int peer_id_len,
1405     const u_char *sess_id, u_int sess_id_len,
1406     const u_char *peer_confirm_hash, u_int peer_confirm_hash_len)
1407 {
1408         Buffer m;
1409         int success = 0;
1410
1411         debug3("%s entering", __func__);
1412
1413         buffer_init(&m);
1414         /* k is dummy in slave, ignored */
1415         /* monitor knows all the ids */
1416         buffer_put_string(&m, peer_confirm_hash, peer_confirm_hash_len);
1417         mm_request_send(pmonitor->m_recvfd,
1418             MONITOR_REQ_JPAKE_CHECK_CONFIRM, &m);
1419
1420         debug3("%s: waiting for MONITOR_ANS_JPAKE_CHECK_CONFIRM", __func__);
1421         mm_request_receive_expect(pmonitor->m_recvfd,
1422             MONITOR_ANS_JPAKE_CHECK_CONFIRM, &m);
1423
1424         success = buffer_get_int(&m);
1425         buffer_free(&m);
1426
1427         debug3("%s: success = %d", __func__, success);
1428         return success;
1429 }
1430 #endif /* JPAKE */