crypto/openssh-5/monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.60 2007/10/29 04:08:08 dtucker 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
  44 #include "xmalloc.h"
  45 #include "ssh.h"
  46 #include "dh.h"
  47 #include "buffer.h"
  48 #include "key.h"
  49 #include "cipher.h"
  50 #include "kex.h"
  51 #include "hostfile.h"
  52 #include "auth.h"
  53 #include "auth-options.h"
  54 #include "packet.h"
  55 #include "mac.h"
  56 #include "log.h"
  57 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  58 #undef TARGET_OS_MAC
  59 #include "zlib.h"
  60 #define TARGET_OS_MAC 1
  61 #else
  62 #include "zlib.h"
  63 #endif
  64 #include "monitor.h"
  65 #ifdef GSSAPI
  66 #include "ssh-gss.h"
  67 #endif
  68 #include "monitor_wrap.h"
  69 #include "atomicio.h"
  70 #include "monitor_fdpass.h"
  71 #include "misc.h"
  72 #include "servconf.h"
  73
  74 #include "channels.h"
  75 #include "session.h"
  76 #include "servconf.h"
  77
  78 /* Imports */
  79 extern int compat20;
  80 extern Newkeys *newkeys[];
  81 extern z_stream incoming_stream;
  82 extern z_stream outgoing_stream;
  83 extern struct monitor *pmonitor;
  84 extern Buffer input, output;
  85 extern Buffer loginmsg;
  86 extern ServerOptions options;
  87
  88 int
  89 mm_is_monitor(void)
  90 {
  91         /*
  92          * m_pid is only set in the privileged part, and
  93          * points to the unprivileged child.
  94          */
  95         return (pmonitor && pmonitor->m_pid > 0);
  96 }
  97
  98 void
  99 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
 100 {
 101         u_int mlen = buffer_len(m);
 102         u_char buf[5];
 103
 104         debug3("%s entering: type %d", __func__, type);
 105
 106         put_u32(buf, mlen + 1);
 107         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 108         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 109                 fatal("%s: write: %s", __func__, strerror(errno));
 110         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 111                 fatal("%s: write: %s", __func__, strerror(errno));
 112 }
 113
 114 void
 115 mm_request_receive(int sock, Buffer *m)
 116 {
 117         u_char buf[4];
 118         u_int msg_len;
 119
 120         debug3("%s entering", __func__);
 121
 122         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 123                 if (errno == EPIPE)
 124                         cleanup_exit(255);
 125                 fatal("%s: read: %s", __func__, strerror(errno));
 126         }
 127         msg_len = get_u32(buf);
 128         if (msg_len > 256 * 1024)
 129                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 130         buffer_clear(m);
 131         buffer_append_space(m, msg_len);
 132         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 133                 fatal("%s: read: %s", __func__, strerror(errno));
 134 }
 135
 136 void
 137 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 138 {
 139         u_char rtype;
 140
 141         debug3("%s entering: type %d", __func__, type);
 142
 143         mm_request_receive(sock, m);
 144         rtype = buffer_get_char(m);
 145         if (rtype != type)
 146                 fatal("%s: read: rtype %d != type %d", __func__,
 147                     rtype, type);
 148 }
 149
 150 DH *
 151 mm_choose_dh(int min, int nbits, int max)
 152 {
 153         BIGNUM *p, *g;
 154         int success = 0;
 155         Buffer m;
 156
 157         buffer_init(&m);
 158         buffer_put_int(&m, min);
 159         buffer_put_int(&m, nbits);
 160         buffer_put_int(&m, max);
 161
 162         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 163
 164         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 165         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 166
 167         success = buffer_get_char(&m);
 168         if (success == 0)
 169                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 170
 171         if ((p = BN_new()) == NULL)
 172                 fatal("%s: BN_new failed", __func__);
 173         if ((g = BN_new()) == NULL)
 174                 fatal("%s: BN_new failed", __func__);
 175         buffer_get_bignum2(&m, p);
 176         buffer_get_bignum2(&m, g);
 177
 178         debug3("%s: remaining %d", __func__, buffer_len(&m));
 179         buffer_free(&m);
 180
 181         return (dh_new_group(g, p));
 182 }
 183
 184 int
 185 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 186 {
 187         Kex *kex = *pmonitor->m_pkex;
 188         Buffer m;
 189
 190         debug3("%s entering", __func__);
 191
 192         buffer_init(&m);
 193         buffer_put_int(&m, kex->host_key_index(key));
 194         buffer_put_string(&m, data, datalen);
 195
 196         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 197
 198         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 199         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 200         *sigp  = buffer_get_string(&m, lenp);
 201         buffer_free(&m);
 202
 203         return (0);
 204 }
 205
 206 struct passwd *
 207 mm_getpwnamallow(const char *username)
 208 {
 209         Buffer m;
 210         struct passwd *pw;
 211         u_int len;
 212         ServerOptions *newopts;
 213
 214         debug3("%s entering", __func__);
 215
 216         buffer_init(&m);
 217         buffer_put_cstring(&m, username);
 218
 219         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 220
 221         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 222         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 223
 224         if (buffer_get_char(&m) == 0) {
 225                 pw = NULL;
 226                 goto out;
 227         }
 228         pw = buffer_get_string(&m, &len);
 229         if (len != sizeof(struct passwd))
 230                 fatal("%s: struct passwd size mismatch", __func__);
 231         pw->pw_name = buffer_get_string(&m, NULL);
 232         pw->pw_passwd = buffer_get_string(&m, NULL);
 233         pw->pw_gecos = buffer_get_string(&m, NULL);
 234 #ifdef HAVE_PW_CLASS_IN_PASSWD
 235         pw->pw_class = buffer_get_string(&m, NULL);
 236 #endif
 237         pw->pw_dir = buffer_get_string(&m, NULL);
 238         pw->pw_shell = buffer_get_string(&m, NULL);
 239
 240 out:
 241         /* copy options block as a Match directive may have changed some */
 242         newopts = buffer_get_string(&m, &len);
 243         if (len != sizeof(*newopts))
 244                 fatal("%s: option block size mismatch", __func__);
 245         if (newopts->banner != NULL)
 246                 newopts->banner = buffer_get_string(&m, NULL);
 247         copy_set_server_options(&options, newopts, 1);
 248         xfree(newopts);
 249
 250         buffer_free(&m);
 251
 252         return (pw);
 253 }
 254
 255 char *
 256 mm_auth2_read_banner(void)
 257 {
 258         Buffer m;
 259         char *banner;
 260
 261         debug3("%s entering", __func__);
 262
 263         buffer_init(&m);
 264         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 265         buffer_clear(&m);
 266
 267         mm_request_receive_expect(pmonitor->m_recvfd,
 268             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 269         banner = buffer_get_string(&m, NULL);
 270         buffer_free(&m);
 271
 272         /* treat empty banner as missing banner */
 273         if (strlen(banner) == 0) {
 274                 xfree(banner);
 275                 banner = NULL;
 276         }
 277         return (banner);
 278 }
 279
 280 /* Inform the privileged process about service and style */
 281
 282 void
 283 mm_inform_authserv(char *service, char *style)
 284 {
 285         Buffer m;
 286
 287         debug3("%s entering", __func__);
 288
 289         buffer_init(&m);
 290         buffer_put_cstring(&m, service);
 291         buffer_put_cstring(&m, style ? style : "");
 292
 293         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 294
 295         buffer_free(&m);
 296 }
 297
 298 /* Do the password authentication */
 299 int
 300 mm_auth_password(Authctxt *authctxt, char *password)
 301 {
 302         Buffer m;
 303         int authenticated = 0;
 304
 305         debug3("%s entering", __func__);
 306
 307         buffer_init(&m);
 308         buffer_put_cstring(&m, password);
 309         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 310
 311         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 312         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 313
 314         authenticated = buffer_get_int(&m);
 315
 316         buffer_free(&m);
 317
 318         debug3("%s: user %sauthenticated",
 319             __func__, authenticated ? "" : "not ");
 320         return (authenticated);
 321 }
 322
 323 int
 324 mm_user_key_allowed(struct passwd *pw, Key *key)
 325 {
 326         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 327 }
 328
 329 int
 330 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 331     Key *key)
 332 {
 333         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 334 }
 335
 336 int
 337 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 338     char *host, Key *key)
 339 {
 340         int ret;
 341
 342         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 343         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 344         key->type = KEY_RSA1;
 345         return (ret);
 346 }
 347
 348 static void
 349 mm_send_debug(Buffer *m)
 350 {
 351         char *msg;
 352
 353         while (buffer_len(m)) {
 354                 msg = buffer_get_string(m, NULL);
 355                 debug3("%s: Sending debug: %s", __func__, msg);
 356                 packet_send_debug("%s", msg);
 357                 xfree(msg);
 358         }
 359 }
 360
 361 int
 362 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 363 {
 364         Buffer m;
 365         u_char *blob;
 366         u_int len;
 367         int allowed = 0, have_forced = 0;
 368
 369         debug3("%s entering", __func__);
 370
 371         /* Convert the key to a blob and the pass it over */
 372         if (!key_to_blob(key, &blob, &len))
 373                 return (0);
 374
 375         buffer_init(&m);
 376         buffer_put_int(&m, type);
 377         buffer_put_cstring(&m, user ? user : "");
 378         buffer_put_cstring(&m, host ? host : "");
 379         buffer_put_string(&m, blob, len);
 380         xfree(blob);
 381
 382         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 383
 384         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 385         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 386
 387         allowed = buffer_get_int(&m);
 388
 389         /* fake forced command */
 390         auth_clear_options();
 391         have_forced = buffer_get_int(&m);
 392         forced_command = have_forced ? xstrdup("true") : NULL;
 393
 394         /* Send potential debug messages */
 395         mm_send_debug(&m);
 396
 397         buffer_free(&m);
 398
 399         return (allowed);
 400 }
 401
 402 /*
 403  * This key verify needs to send the key type along, because the
 404  * privileged parent makes the decision if the key is allowed
 405  * for authentication.
 406  */
 407
 408 int
 409 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 410 {
 411         Buffer m;
 412         u_char *blob;
 413         u_int len;
 414         int verified = 0;
 415
 416         debug3("%s entering", __func__);
 417
 418         /* Convert the key to a blob and the pass it over */
 419         if (!key_to_blob(key, &blob, &len))
 420                 return (0);
 421
 422         buffer_init(&m);
 423         buffer_put_string(&m, blob, len);
 424         buffer_put_string(&m, sig, siglen);
 425         buffer_put_string(&m, data, datalen);
 426         xfree(blob);
 427
 428         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 429
 430         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 431         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 432
 433         verified = buffer_get_int(&m);
 434
 435         buffer_free(&m);
 436
 437         return (verified);
 438 }
 439
 440 /* Export key state after authentication */
 441 Newkeys *
 442 mm_newkeys_from_blob(u_char *blob, int blen)
 443 {
 444         Buffer b;
 445         u_int len;
 446         Newkeys *newkey = NULL;
 447         Enc *enc;
 448         Mac *mac;
 449         Comp *comp;
 450
 451         debug3("%s: %p(%d)", __func__, blob, blen);
 452 #ifdef DEBUG_PK
 453         dump_base64(stderr, blob, blen);
 454 #endif
 455         buffer_init(&b);
 456         buffer_append(&b, blob, blen);
 457
 458         newkey = xmalloc(sizeof(*newkey));
 459         enc = &newkey->enc;
 460         mac = &newkey->mac;
 461         comp = &newkey->comp;
 462
 463         /* Enc structure */
 464         enc->name = buffer_get_string(&b, NULL);
 465         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 466         enc->enabled = buffer_get_int(&b);
 467         enc->block_size = buffer_get_int(&b);
 468         enc->key = buffer_get_string(&b, &enc->key_len);
 469         enc->iv = buffer_get_string(&b, &len);
 470         if (len != enc->block_size)
 471                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 472                     enc->block_size, len);
 473
 474         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 475                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 476                     enc->name, enc->cipher);
 477
 478         /* Mac structure */
 479         mac->name = buffer_get_string(&b, NULL);
 480         if (mac->name == NULL || mac_setup(mac, mac->name) == -1)
 481                 fatal("%s: can not setup mac %s", __func__, mac->name);
 482         mac->enabled = buffer_get_int(&b);
 483         mac->key = buffer_get_string(&b, &len);
 484         if (len > mac->key_len)
 485                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 486                     mac->key_len);
 487         mac->key_len = len;
 488
 489         /* Comp structure */
 490         comp->type = buffer_get_int(&b);
 491         comp->enabled = buffer_get_int(&b);
 492         comp->name = buffer_get_string(&b, NULL);
 493
 494         len = buffer_len(&b);
 495         if (len != 0)
 496                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 497         buffer_free(&b);
 498         return (newkey);
 499 }
 500
 501 int
 502 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 503 {
 504         Buffer b;
 505         int len;
 506         Enc *enc;
 507         Mac *mac;
 508         Comp *comp;
 509         Newkeys *newkey = newkeys[mode];
 510
 511         debug3("%s: converting %p", __func__, newkey);
 512
 513         if (newkey == NULL) {
 514                 error("%s: newkey == NULL", __func__);
 515                 return 0;
 516         }
 517         enc = &newkey->enc;
 518         mac = &newkey->mac;
 519         comp = &newkey->comp;
 520
 521         buffer_init(&b);
 522         /* Enc structure */
 523         buffer_put_cstring(&b, enc->name);
 524         /* The cipher struct is constant and shared, you export pointer */
 525         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 526         buffer_put_int(&b, enc->enabled);
 527         buffer_put_int(&b, enc->block_size);
 528         buffer_put_string(&b, enc->key, enc->key_len);
 529         packet_get_keyiv(mode, enc->iv, enc->block_size);
 530         buffer_put_string(&b, enc->iv, enc->block_size);
 531
 532         /* Mac structure */
 533         buffer_put_cstring(&b, mac->name);
 534         buffer_put_int(&b, mac->enabled);
 535         buffer_put_string(&b, mac->key, mac->key_len);
 536
 537         /* Comp structure */
 538         buffer_put_int(&b, comp->type);
 539         buffer_put_int(&b, comp->enabled);
 540         buffer_put_cstring(&b, comp->name);
 541
 542         len = buffer_len(&b);
 543         if (lenp != NULL)
 544                 *lenp = len;
 545         if (blobp != NULL) {
 546                 *blobp = xmalloc(len);
 547                 memcpy(*blobp, buffer_ptr(&b), len);
 548         }
 549         memset(buffer_ptr(&b), 0, len);
 550         buffer_free(&b);
 551         return len;
 552 }
 553
 554 static void
 555 mm_send_kex(Buffer *m, Kex *kex)
 556 {
 557         buffer_put_string(m, kex->session_id, kex->session_id_len);
 558         buffer_put_int(m, kex->we_need);
 559         buffer_put_int(m, kex->hostkey_type);
 560         buffer_put_int(m, kex->kex_type);
 561         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 562         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 563         buffer_put_int(m, kex->flags);
 564         buffer_put_cstring(m, kex->client_version_string);
 565         buffer_put_cstring(m, kex->server_version_string);
 566 }
 567
 568 void
 569 mm_send_keystate(struct monitor *monitor)
 570 {
 571         Buffer m;
 572         u_char *blob, *p;
 573         u_int bloblen, plen;
 574         u_int32_t seqnr, packets;
 575         u_int64_t blocks;
 576
 577         buffer_init(&m);
 578
 579         if (!compat20) {
 580                 u_char iv[24];
 581                 u_char *key;
 582                 u_int ivlen, keylen;
 583
 584                 buffer_put_int(&m, packet_get_protocol_flags());
 585
 586                 buffer_put_int(&m, packet_get_ssh1_cipher());
 587
 588                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 589                 keylen = packet_get_encryption_key(NULL);
 590                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 591                 keylen = packet_get_encryption_key(key);
 592                 buffer_put_string(&m, key, keylen);
 593                 memset(key, 0, keylen);
 594                 xfree(key);
 595
 596                 ivlen = packet_get_keyiv_len(MODE_OUT);
 597                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 598                 buffer_put_string(&m, iv, ivlen);
 599                 ivlen = packet_get_keyiv_len(MODE_OUT);
 600                 packet_get_keyiv(MODE_IN, iv, ivlen);
 601                 buffer_put_string(&m, iv, ivlen);
 602                 goto skip;
 603         } else {
 604                 /* Kex for rekeying */
 605                 mm_send_kex(&m, *monitor->m_pkex);
 606         }
 607
 608         debug3("%s: Sending new keys: %p %p",
 609             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 610
 611         /* Keys from Kex */
 612         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 613                 fatal("%s: conversion of newkeys failed", __func__);
 614
 615         buffer_put_string(&m, blob, bloblen);
 616         xfree(blob);
 617
 618         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 619                 fatal("%s: conversion of newkeys failed", __func__);
 620
 621         buffer_put_string(&m, blob, bloblen);
 622         xfree(blob);
 623
 624         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
 625         buffer_put_int(&m, seqnr);
 626         buffer_put_int64(&m, blocks);
 627         buffer_put_int(&m, packets);
 628         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 629         buffer_put_int(&m, seqnr);
 630         buffer_put_int64(&m, blocks);
 631         buffer_put_int(&m, packets);
 632
 633         debug3("%s: New keys have been sent", __func__);
 634  skip:
 635         /* More key context */
 636         plen = packet_get_keycontext(MODE_OUT, NULL);
 637         p = xmalloc(plen+1);
 638         packet_get_keycontext(MODE_OUT, p);
 639         buffer_put_string(&m, p, plen);
 640         xfree(p);
 641
 642         plen = packet_get_keycontext(MODE_IN, NULL);
 643         p = xmalloc(plen+1);
 644         packet_get_keycontext(MODE_IN, p);
 645         buffer_put_string(&m, p, plen);
 646         xfree(p);
 647
 648         /* Compression state */
 649         debug3("%s: Sending compression state", __func__);
 650         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 651         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 652
 653         /* Network I/O buffers */
 654         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 655         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 656
 657         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 658         debug3("%s: Finished sending state", __func__);
 659
 660         buffer_free(&m);
 661 }
 662
 663 int
 664 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 665 {
 666         Buffer m;
 667         char *p, *msg;
 668         int success = 0;
 669
 670         buffer_init(&m);
 671         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 672
 673         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 674         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 675
 676         success = buffer_get_int(&m);
 677         if (success == 0) {
 678                 debug3("%s: pty alloc failed", __func__);
 679                 buffer_free(&m);
 680                 return (0);
 681         }
 682         p = buffer_get_string(&m, NULL);
 683         msg = buffer_get_string(&m, NULL);
 684         buffer_free(&m);
 685
 686         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 687         xfree(p);
 688
 689         buffer_append(&loginmsg, msg, strlen(msg));
 690         xfree(msg);
 691
 692         if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
 693             (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
 694                 fatal("%s: receive fds failed", __func__);
 695
 696         /* Success */
 697         return (1);
 698 }
 699
 700 void
 701 mm_session_pty_cleanup2(Session *s)
 702 {
 703         Buffer m;
 704
 705         if (s->ttyfd == -1)
 706                 return;
 707         buffer_init(&m);
 708         buffer_put_cstring(&m, s->tty);
 709         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 710         buffer_free(&m);
 711
 712         /* closed dup'ed master */
 713         if (close(s->ptymaster) < 0)
 714                 error("close(s->ptymaster): %s", strerror(errno));
 715
 716         /* unlink pty from session */
 717         s->ttyfd = -1;
 718 }
 719
 720 #ifdef USE_PAM
 721 void
 722 mm_start_pam(Authctxt *authctxt)
 723 {
 724         Buffer m;
 725
 726         debug3("%s entering", __func__);
 727         if (!options.use_pam)
 728                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 729
 730         buffer_init(&m);
 731         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 732
 733         buffer_free(&m);
 734 }
 735
 736 u_int
 737 mm_do_pam_account(void)
 738 {
 739         Buffer m;
 740         u_int ret;
 741         char *msg;
 742
 743         debug3("%s entering", __func__);
 744         if (!options.use_pam)
 745                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 746
 747         buffer_init(&m);
 748         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 749
 750         mm_request_receive_expect(pmonitor->m_recvfd,
 751             MONITOR_ANS_PAM_ACCOUNT, &m);
 752         ret = buffer_get_int(&m);
 753         msg = buffer_get_string(&m, NULL);
 754         buffer_append(&loginmsg, msg, strlen(msg));
 755         xfree(msg);
 756
 757         buffer_free(&m);
 758
 759         debug3("%s returning %d", __func__, ret);
 760
 761         return (ret);
 762 }
 763
 764 void *
 765 mm_sshpam_init_ctx(Authctxt *authctxt)
 766 {
 767         Buffer m;
 768         int success;
 769
 770         debug3("%s", __func__);
 771         buffer_init(&m);
 772         buffer_put_cstring(&m, authctxt->user);
 773         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 774         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 775         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 776         success = buffer_get_int(&m);
 777         if (success == 0) {
 778                 debug3("%s: pam_init_ctx failed", __func__);
 779                 buffer_free(&m);
 780                 return (NULL);
 781         }
 782         buffer_free(&m);
 783         return (authctxt);
 784 }
 785
 786 int
 787 mm_sshpam_query(void *ctx, char **name, char **info,
 788     u_int *num, char ***prompts, u_int **echo_on)
 789 {
 790         Buffer m;
 791         u_int i;
 792         int ret;
 793
 794         debug3("%s", __func__);
 795         buffer_init(&m);
 796         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 797         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 798         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 799         ret = buffer_get_int(&m);
 800         debug3("%s: pam_query returned %d", __func__, ret);
 801         *name = buffer_get_string(&m, NULL);
 802         *info = buffer_get_string(&m, NULL);
 803         *num = buffer_get_int(&m);
 804         if (*num > PAM_MAX_NUM_MSG)
 805                 fatal("%s: recieved %u PAM messages, expected <= %u",
 806                     __func__, *num, PAM_MAX_NUM_MSG);
 807         *prompts = xcalloc((*num + 1), sizeof(char *));
 808         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 809         for (i = 0; i < *num; ++i) {
 810                 (*prompts)[i] = buffer_get_string(&m, NULL);
 811                 (*echo_on)[i] = buffer_get_int(&m);
 812         }
 813         buffer_free(&m);
 814         return (ret);
 815 }
 816
 817 int
 818 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 819 {
 820         Buffer m;
 821         u_int i;
 822         int ret;
 823
 824         debug3("%s", __func__);
 825         buffer_init(&m);
 826         buffer_put_int(&m, num);
 827         for (i = 0; i < num; ++i)
 828                 buffer_put_cstring(&m, resp[i]);
 829         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 830         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 831         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 832         ret = buffer_get_int(&m);
 833         debug3("%s: pam_respond returned %d", __func__, ret);
 834         buffer_free(&m);
 835         return (ret);
 836 }
 837
 838 void
 839 mm_sshpam_free_ctx(void *ctxtp)
 840 {
 841         Buffer m;
 842
 843         debug3("%s", __func__);
 844         buffer_init(&m);
 845         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 846         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 847         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 848         buffer_free(&m);
 849 }
 850 #endif /* USE_PAM */
 851
 852 /* Request process termination */
 853
 854 void
 855 mm_terminate(void)
 856 {
 857         Buffer m;
 858
 859         buffer_init(&m);
 860         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 861         buffer_free(&m);
 862 }
 863
 864 int
 865 mm_ssh1_session_key(BIGNUM *num)
 866 {
 867         int rsafail;
 868         Buffer m;
 869
 870         buffer_init(&m);
 871         buffer_put_bignum2(&m, num);
 872         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 873
 874         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 875
 876         rsafail = buffer_get_int(&m);
 877         buffer_get_bignum2(&m, num);
 878
 879         buffer_free(&m);
 880
 881         return (rsafail);
 882 }
 883
 884 static void
 885 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 886     char ***prompts, u_int **echo_on)
 887 {
 888         *name = xstrdup("");
 889         *infotxt = xstrdup("");
 890         *numprompts = 1;
 891         *prompts = xcalloc(*numprompts, sizeof(char *));
 892         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 893         (*echo_on)[0] = 0;
 894 }
 895
 896 int
 897 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 898    u_int *numprompts, char ***prompts, u_int **echo_on)
 899 {
 900         Buffer m;
 901         u_int success;
 902         char *challenge;
 903
 904         debug3("%s: entering", __func__);
 905
 906         buffer_init(&m);
 907         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 908
 909         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 910             &m);
 911         success = buffer_get_int(&m);
 912         if (success == 0) {
 913                 debug3("%s: no challenge", __func__);
 914                 buffer_free(&m);
 915                 return (-1);
 916         }
 917
 918         /* Get the challenge, and format the response */
 919         challenge  = buffer_get_string(&m, NULL);
 920         buffer_free(&m);
 921
 922         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 923         (*prompts)[0] = challenge;
 924
 925         debug3("%s: received challenge: %s", __func__, challenge);
 926
 927         return (0);
 928 }
 929
 930 int
 931 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 932 {
 933         Buffer m;
 934         int authok;
 935
 936         debug3("%s: entering", __func__);
 937         if (numresponses != 1)
 938                 return (-1);
 939
 940         buffer_init(&m);
 941         buffer_put_cstring(&m, responses[0]);
 942         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 943
 944         mm_request_receive_expect(pmonitor->m_recvfd,
 945             MONITOR_ANS_BSDAUTHRESPOND, &m);
 946
 947         authok = buffer_get_int(&m);
 948         buffer_free(&m);
 949
 950         return ((authok == 0) ? -1 : 0);
 951 }
 952
 953 #ifdef SKEY
 954 int
 955 mm_skey_query(void *ctx, char **name, char **infotxt,
 956    u_int *numprompts, char ***prompts, u_int **echo_on)
 957 {
 958         Buffer m;
 959         u_int success;
 960         char *challenge;
 961
 962         debug3("%s: entering", __func__);
 963
 964         buffer_init(&m);
 965         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 966
 967         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 968             &m);
 969         success = buffer_get_int(&m);
 970         if (success == 0) {
 971                 debug3("%s: no challenge", __func__);
 972                 buffer_free(&m);
 973                 return (-1);
 974         }
 975
 976         /* Get the challenge, and format the response */
 977         challenge  = buffer_get_string(&m, NULL);
 978         buffer_free(&m);
 979
 980         debug3("%s: received challenge: %s", __func__, challenge);
 981
 982         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 983
 984         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
 985         xfree(challenge);
 986
 987         return (0);
 988 }
 989
 990 int
 991 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 992 {
 993         Buffer m;
 994         int authok;
 995
 996         debug3("%s: entering", __func__);
 997         if (numresponses != 1)
 998                 return (-1);
 999
1000         buffer_init(&m);
1001         buffer_put_cstring(&m, responses[0]);
1002         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1003
1004         mm_request_receive_expect(pmonitor->m_recvfd,
1005             MONITOR_ANS_SKEYRESPOND, &m);
1006
1007         authok = buffer_get_int(&m);
1008         buffer_free(&m);
1009
1010         return ((authok == 0) ? -1 : 0);
1011 }
1012 #endif /* SKEY */
1013
1014 void
1015 mm_ssh1_session_id(u_char session_id[16])
1016 {
1017         Buffer m;
1018         int i;
1019
1020         debug3("%s entering", __func__);
1021
1022         buffer_init(&m);
1023         for (i = 0; i < 16; i++)
1024                 buffer_put_char(&m, session_id[i]);
1025
1026         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1027         buffer_free(&m);
1028 }
1029
1030 int
1031 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1032 {
1033         Buffer m;
1034         Key *key;
1035         u_char *blob;
1036         u_int blen;
1037         int allowed = 0, have_forced = 0;
1038
1039         debug3("%s entering", __func__);
1040
1041         buffer_init(&m);
1042         buffer_put_bignum2(&m, client_n);
1043
1044         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1045         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1046
1047         allowed = buffer_get_int(&m);
1048
1049         /* fake forced command */
1050         auth_clear_options();
1051         have_forced = buffer_get_int(&m);
1052         forced_command = have_forced ? xstrdup("true") : NULL;
1053
1054         if (allowed && rkey != NULL) {
1055                 blob = buffer_get_string(&m, &blen);
1056                 if ((key = key_from_blob(blob, blen)) == NULL)
1057                         fatal("%s: key_from_blob failed", __func__);
1058                 *rkey = key;
1059                 xfree(blob);
1060         }
1061         mm_send_debug(&m);
1062         buffer_free(&m);
1063
1064         return (allowed);
1065 }
1066
1067 BIGNUM *
1068 mm_auth_rsa_generate_challenge(Key *key)
1069 {
1070         Buffer m;
1071         BIGNUM *challenge;
1072         u_char *blob;
1073         u_int blen;
1074
1075         debug3("%s entering", __func__);
1076
1077         if ((challenge = BN_new()) == NULL)
1078                 fatal("%s: BN_new failed", __func__);
1079
1080         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1081         if (key_to_blob(key, &blob, &blen) == 0)
1082                 fatal("%s: key_to_blob failed", __func__);
1083         key->type = KEY_RSA1;
1084
1085         buffer_init(&m);
1086         buffer_put_string(&m, blob, blen);
1087         xfree(blob);
1088
1089         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1090         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1091
1092         buffer_get_bignum2(&m, challenge);
1093         buffer_free(&m);
1094
1095         return (challenge);
1096 }
1097
1098 int
1099 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1100 {
1101         Buffer m;
1102         u_char *blob;
1103         u_int blen;
1104         int success = 0;
1105
1106         debug3("%s entering", __func__);
1107
1108         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1109         if (key_to_blob(key, &blob, &blen) == 0)
1110                 fatal("%s: key_to_blob failed", __func__);
1111         key->type = KEY_RSA1;
1112
1113         buffer_init(&m);
1114         buffer_put_string(&m, blob, blen);
1115         buffer_put_string(&m, response, 16);
1116         xfree(blob);
1117
1118         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1119         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1120
1121         success = buffer_get_int(&m);
1122         buffer_free(&m);
1123
1124         return (success);
1125 }
1126
1127 #ifdef SSH_AUDIT_EVENTS
1128 void
1129 mm_audit_event(ssh_audit_event_t event)
1130 {
1131         Buffer m;
1132
1133         debug3("%s entering", __func__);
1134
1135         buffer_init(&m);
1136         buffer_put_int(&m, event);
1137
1138         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1139         buffer_free(&m);
1140 }
1141
1142 void
1143 mm_audit_run_command(const char *command)
1144 {
1145         Buffer m;
1146
1147         debug3("%s entering command %s", __func__, command);
1148
1149         buffer_init(&m);
1150         buffer_put_cstring(&m, command);
1151
1152         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1153         buffer_free(&m);
1154 }
1155 #endif /* SSH_AUDIT_EVENTS */
1156
1157 #ifdef GSSAPI
1158 OM_uint32
1159 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1160 {
1161         Buffer m;
1162         OM_uint32 major;
1163
1164         /* Client doesn't get to see the context */
1165         *ctx = NULL;
1166
1167         buffer_init(&m);
1168         buffer_put_string(&m, goid->elements, goid->length);
1169
1170         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1171         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1172
1173         major = buffer_get_int(&m);
1174
1175         buffer_free(&m);
1176         return (major);
1177 }
1178
1179 OM_uint32
1180 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1181     gss_buffer_desc *out, OM_uint32 *flags)
1182 {
1183         Buffer m;
1184         OM_uint32 major;
1185         u_int len;
1186
1187         buffer_init(&m);
1188         buffer_put_string(&m, in->value, in->length);
1189
1190         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1191         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1192
1193         major = buffer_get_int(&m);
1194         out->value = buffer_get_string(&m, &len);
1195         out->length = len;
1196         if (flags)
1197                 *flags = buffer_get_int(&m);
1198
1199         buffer_free(&m);
1200
1201         return (major);
1202 }
1203
1204 OM_uint32
1205 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1206 {
1207         Buffer m;
1208         OM_uint32 major;
1209
1210         buffer_init(&m);
1211         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1212         buffer_put_string(&m, gssmic->value, gssmic->length);
1213
1214         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1215         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1216             &m);
1217
1218         major = buffer_get_int(&m);
1219         buffer_free(&m);
1220         return(major);
1221 }
1222
1223 int
1224 mm_ssh_gssapi_userok(char *user)
1225 {
1226         Buffer m;
1227         int authenticated = 0;
1228
1229         buffer_init(&m);
1230
1231         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1232         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1233                                   &m);
1234
1235         authenticated = buffer_get_int(&m);
1236
1237         buffer_free(&m);
1238         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1239         return (authenticated);
1240 }
1241 #endif /* GSSAPI */