crypto/openssh/monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.80 2014/04/29 18:01:49 markus 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 #ifdef WITH_OPENSSL
  42 #include <openssl/bn.h>
  43 #include <openssl/dh.h>
  44 #include <openssl/evp.h>
  45 #endif
  46
  47 #include "openbsd-compat/sys-queue.h"
  48 #include "xmalloc.h"
  49 #include "ssh.h"
  50 #ifdef WITH_OPENSSL
  51 #include "dh.h"
  52 #endif
  53 #include "buffer.h"
  54 #include "key.h"
  55 #include "cipher.h"
  56 #include "kex.h"
  57 #include "hostfile.h"
  58 #include "auth.h"
  59 #include "auth-options.h"
  60 #include "packet.h"
  61 #include "mac.h"
  62 #include "log.h"
  63 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  64 #undef TARGET_OS_MAC
  65 #include "zlib.h"
  66 #define TARGET_OS_MAC 1
  67 #else
  68 #include "zlib.h"
  69 #endif
  70 #include "monitor.h"
  71 #ifdef GSSAPI
  72 #include "ssh-gss.h"
  73 #endif
  74 #include "monitor_wrap.h"
  75 #include "atomicio.h"
  76 #include "monitor_fdpass.h"
  77 #include "misc.h"
  78 #include "uuencode.h"
  79
  80 #include "channels.h"
  81 #include "session.h"
  82 #include "servconf.h"
  83 #include "roaming.h"
  84
  85 /* Imports */
  86 extern int compat20;
  87 extern z_stream incoming_stream;
  88 extern z_stream outgoing_stream;
  89 extern struct monitor *pmonitor;
  90 extern Buffer loginmsg;
  91 extern ServerOptions options;
  92
  93 void
  94 mm_log_handler(LogLevel level, const char *msg, void *ctx)
  95 {
  96         Buffer log_msg;
  97         struct monitor *mon = (struct monitor *)ctx;
  98
  99         if (mon->m_log_sendfd == -1)
 100                 fatal("%s: no log channel", __func__);
 101
 102         buffer_init(&log_msg);
 103         /*
 104          * Placeholder for packet length. Will be filled in with the actual
 105          * packet length once the packet has been constucted. This saves
 106          * fragile math.
 107          */
 108         buffer_put_int(&log_msg, 0);
 109
 110         buffer_put_int(&log_msg, level);
 111         buffer_put_cstring(&log_msg, msg);
 112         put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4);
 113         if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg),
 114             buffer_len(&log_msg)) != buffer_len(&log_msg))
 115                 fatal("%s: write: %s", __func__, strerror(errno));
 116         buffer_free(&log_msg);
 117 }
 118
 119 int
 120 mm_is_monitor(void)
 121 {
 122         /*
 123          * m_pid is only set in the privileged part, and
 124          * points to the unprivileged child.
 125          */
 126         return (pmonitor && pmonitor->m_pid > 0);
 127 }
 128
 129 void
 130 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
 131 {
 132         u_int mlen = buffer_len(m);
 133         u_char buf[5];
 134
 135         debug3("%s entering: type %d", __func__, type);
 136
 137         put_u32(buf, mlen + 1);
 138         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 139         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 140                 fatal("%s: write: %s", __func__, strerror(errno));
 141         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 142                 fatal("%s: write: %s", __func__, strerror(errno));
 143 }
 144
 145 void
 146 mm_request_receive(int sock, Buffer *m)
 147 {
 148         u_char buf[4];
 149         u_int msg_len;
 150
 151         debug3("%s entering", __func__);
 152
 153         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 154                 if (errno == EPIPE)
 155                         cleanup_exit(255);
 156                 fatal("%s: read: %s", __func__, strerror(errno));
 157         }
 158         msg_len = get_u32(buf);
 159         if (msg_len > 256 * 1024)
 160                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 161         buffer_clear(m);
 162         buffer_append_space(m, msg_len);
 163         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 164                 fatal("%s: read: %s", __func__, strerror(errno));
 165 }
 166
 167 void
 168 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 169 {
 170         u_char rtype;
 171
 172         debug3("%s entering: type %d", __func__, type);
 173
 174         mm_request_receive(sock, m);
 175         rtype = buffer_get_char(m);
 176         if (rtype != type)
 177                 fatal("%s: read: rtype %d != type %d", __func__,
 178                     rtype, type);
 179 }
 180
 181 #ifdef WITH_OPENSSL
 182 DH *
 183 mm_choose_dh(int min, int nbits, int max)
 184 {
 185         BIGNUM *p, *g;
 186         int success = 0;
 187         Buffer m;
 188
 189         buffer_init(&m);
 190         buffer_put_int(&m, min);
 191         buffer_put_int(&m, nbits);
 192         buffer_put_int(&m, max);
 193
 194         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 195
 196         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 197         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 198
 199         success = buffer_get_char(&m);
 200         if (success == 0)
 201                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 202
 203         if ((p = BN_new()) == NULL)
 204                 fatal("%s: BN_new failed", __func__);
 205         if ((g = BN_new()) == NULL)
 206                 fatal("%s: BN_new failed", __func__);
 207         buffer_get_bignum2(&m, p);
 208         buffer_get_bignum2(&m, g);
 209
 210         debug3("%s: remaining %d", __func__, buffer_len(&m));
 211         buffer_free(&m);
 212
 213         return (dh_new_group(g, p));
 214 }
 215 #endif
 216
 217 int
 218 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 219 {
 220         Kex *kex = *pmonitor->m_pkex;
 221         Buffer m;
 222
 223         debug3("%s entering", __func__);
 224
 225         buffer_init(&m);
 226         buffer_put_int(&m, kex->host_key_index(key));
 227         buffer_put_string(&m, data, datalen);
 228
 229         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 230
 231         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 232         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 233         *sigp  = buffer_get_string(&m, lenp);
 234         buffer_free(&m);
 235
 236         return (0);
 237 }
 238
 239 struct passwd *
 240 mm_getpwnamallow(const char *username)
 241 {
 242         Buffer m;
 243         struct passwd *pw;
 244         u_int len, i;
 245         ServerOptions *newopts;
 246
 247         debug3("%s entering", __func__);
 248
 249         buffer_init(&m);
 250         buffer_put_cstring(&m, username);
 251
 252         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 253
 254         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 255         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 256
 257         if (buffer_get_char(&m) == 0) {
 258                 pw = NULL;
 259                 goto out;
 260         }
 261         pw = buffer_get_string(&m, &len);
 262         if (len != sizeof(struct passwd))
 263                 fatal("%s: struct passwd size mismatch", __func__);
 264         pw->pw_name = buffer_get_string(&m, NULL);
 265         pw->pw_passwd = buffer_get_string(&m, NULL);
 266 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS
 267         pw->pw_gecos = buffer_get_string(&m, NULL);
 268 #endif
 269 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS
 270         pw->pw_class = buffer_get_string(&m, NULL);
 271 #endif
 272         pw->pw_dir = buffer_get_string(&m, NULL);
 273         pw->pw_shell = buffer_get_string(&m, NULL);
 274
 275 out:
 276         /* copy options block as a Match directive may have changed some */
 277         newopts = buffer_get_string(&m, &len);
 278         if (len != sizeof(*newopts))
 279                 fatal("%s: option block size mismatch", __func__);
 280
 281 #define M_CP_STROPT(x) do { \
 282                 if (newopts->x != NULL) \
 283                         newopts->x = buffer_get_string(&m, NULL); \
 284         } while (0)
 285 #define M_CP_STRARRAYOPT(x, nx) do { \
 286                 for (i = 0; i < newopts->nx; i++) \
 287                         newopts->x[i] = buffer_get_string(&m, NULL); \
 288         } while (0)
 289         /* See comment in servconf.h */
 290         COPY_MATCH_STRING_OPTS();
 291 #undef M_CP_STROPT
 292 #undef M_CP_STRARRAYOPT
 293
 294         copy_set_server_options(&options, newopts, 1);
 295         free(newopts);
 296
 297         buffer_free(&m);
 298
 299         return (pw);
 300 }
 301
 302 char *
 303 mm_auth2_read_banner(void)
 304 {
 305         Buffer m;
 306         char *banner;
 307
 308         debug3("%s entering", __func__);
 309
 310         buffer_init(&m);
 311         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 312         buffer_clear(&m);
 313
 314         mm_request_receive_expect(pmonitor->m_recvfd,
 315             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 316         banner = buffer_get_string(&m, NULL);
 317         buffer_free(&m);
 318
 319         /* treat empty banner as missing banner */
 320         if (strlen(banner) == 0) {
 321                 free(banner);
 322                 banner = NULL;
 323         }
 324         return (banner);
 325 }
 326
 327 /* Inform the privileged process about service and style */
 328
 329 void
 330 mm_inform_authserv(char *service, char *style)
 331 {
 332         Buffer m;
 333
 334         debug3("%s entering", __func__);
 335
 336         buffer_init(&m);
 337         buffer_put_cstring(&m, service);
 338         buffer_put_cstring(&m, style ? style : "");
 339
 340         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 341
 342         buffer_free(&m);
 343 }
 344
 345 /* Do the password authentication */
 346 int
 347 mm_auth_password(Authctxt *authctxt, char *password)
 348 {
 349         Buffer m;
 350         int authenticated = 0;
 351
 352         debug3("%s entering", __func__);
 353
 354         buffer_init(&m);
 355         buffer_put_cstring(&m, password);
 356         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 357
 358         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 359         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 360
 361         authenticated = buffer_get_int(&m);
 362
 363         buffer_free(&m);
 364
 365         debug3("%s: user %sauthenticated",
 366             __func__, authenticated ? "" : "not ");
 367         return (authenticated);
 368 }
 369
 370 int
 371 mm_user_key_allowed(struct passwd *pw, Key *key)
 372 {
 373         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 374 }
 375
 376 int
 377 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 378     Key *key)
 379 {
 380         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 381 }
 382
 383 int
 384 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 385     char *host, Key *key)
 386 {
 387         int ret;
 388
 389         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 390         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 391         key->type = KEY_RSA1;
 392         return (ret);
 393 }
 394
 395 int
 396 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 397 {
 398         Buffer m;
 399         u_char *blob;
 400         u_int len;
 401         int allowed = 0, have_forced = 0;
 402
 403         debug3("%s entering", __func__);
 404
 405         /* Convert the key to a blob and the pass it over */
 406         if (!key_to_blob(key, &blob, &len))
 407                 return (0);
 408
 409         buffer_init(&m);
 410         buffer_put_int(&m, type);
 411         buffer_put_cstring(&m, user ? user : "");
 412         buffer_put_cstring(&m, host ? host : "");
 413         buffer_put_string(&m, blob, len);
 414         free(blob);
 415
 416         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 417
 418         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 419         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 420
 421         allowed = buffer_get_int(&m);
 422
 423         /* fake forced command */
 424         auth_clear_options();
 425         have_forced = buffer_get_int(&m);
 426         forced_command = have_forced ? xstrdup("true") : NULL;
 427
 428         buffer_free(&m);
 429
 430         return (allowed);
 431 }
 432
 433 /*
 434  * This key verify needs to send the key type along, because the
 435  * privileged parent makes the decision if the key is allowed
 436  * for authentication.
 437  */
 438
 439 int
 440 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 441 {
 442         Buffer m;
 443         u_char *blob;
 444         u_int len;
 445         int verified = 0;
 446
 447         debug3("%s entering", __func__);
 448
 449         /* Convert the key to a blob and the pass it over */
 450         if (!key_to_blob(key, &blob, &len))
 451                 return (0);
 452
 453         buffer_init(&m);
 454         buffer_put_string(&m, blob, len);
 455         buffer_put_string(&m, sig, siglen);
 456         buffer_put_string(&m, data, datalen);
 457         free(blob);
 458
 459         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 460
 461         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 462         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 463
 464         verified = buffer_get_int(&m);
 465
 466         buffer_free(&m);
 467
 468         return (verified);
 469 }
 470
 471 /* Export key state after authentication */
 472 Newkeys *
 473 mm_newkeys_from_blob(u_char *blob, int blen)
 474 {
 475         Buffer b;
 476         u_int len;
 477         Newkeys *newkey = NULL;
 478         Enc *enc;
 479         Mac *mac;
 480         Comp *comp;
 481
 482         debug3("%s: %p(%d)", __func__, blob, blen);
 483 #ifdef DEBUG_PK
 484         dump_base64(stderr, blob, blen);
 485 #endif
 486         buffer_init(&b);
 487         buffer_append(&b, blob, blen);
 488
 489         newkey = xcalloc(1, sizeof(*newkey));
 490         enc = &newkey->enc;
 491         mac = &newkey->mac;
 492         comp = &newkey->comp;
 493
 494         /* Enc structure */
 495         enc->name = buffer_get_string(&b, NULL);
 496         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 497         enc->enabled = buffer_get_int(&b);
 498         enc->block_size = buffer_get_int(&b);
 499         enc->key = buffer_get_string(&b, &enc->key_len);
 500         enc->iv = buffer_get_string(&b, &enc->iv_len);
 501
 502         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 503                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 504                     enc->name, enc->cipher);
 505
 506         /* Mac structure */
 507         if (cipher_authlen(enc->cipher) == 0) {
 508                 mac->name = buffer_get_string(&b, NULL);
 509                 if (mac->name == NULL || mac_setup(mac, mac->name) == -1)
 510                         fatal("%s: can not setup mac %s", __func__, mac->name);
 511                 mac->enabled = buffer_get_int(&b);
 512                 mac->key = buffer_get_string(&b, &len);
 513                 if (len > mac->key_len)
 514                         fatal("%s: bad mac key length: %u > %d", __func__, len,
 515                             mac->key_len);
 516                 mac->key_len = len;
 517         }
 518
 519         /* Comp structure */
 520         comp->type = buffer_get_int(&b);
 521         comp->enabled = buffer_get_int(&b);
 522         comp->name = buffer_get_string(&b, NULL);
 523
 524         len = buffer_len(&b);
 525         if (len != 0)
 526                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 527         buffer_free(&b);
 528         return (newkey);
 529 }
 530
 531 int
 532 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 533 {
 534         Buffer b;
 535         int len;
 536         Enc *enc;
 537         Mac *mac;
 538         Comp *comp;
 539         Newkeys *newkey = (Newkeys *)packet_get_newkeys(mode);
 540
 541         debug3("%s: converting %p", __func__, newkey);
 542
 543         if (newkey == NULL) {
 544                 error("%s: newkey == NULL", __func__);
 545                 return 0;
 546         }
 547         enc = &newkey->enc;
 548         mac = &newkey->mac;
 549         comp = &newkey->comp;
 550
 551         buffer_init(&b);
 552         /* Enc structure */
 553         buffer_put_cstring(&b, enc->name);
 554         /* The cipher struct is constant and shared, you export pointer */
 555         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 556         buffer_put_int(&b, enc->enabled);
 557         buffer_put_int(&b, enc->block_size);
 558         buffer_put_string(&b, enc->key, enc->key_len);
 559         packet_get_keyiv(mode, enc->iv, enc->iv_len);
 560         buffer_put_string(&b, enc->iv, enc->iv_len);
 561
 562         /* Mac structure */
 563         if (cipher_authlen(enc->cipher) == 0) {
 564                 buffer_put_cstring(&b, mac->name);
 565                 buffer_put_int(&b, mac->enabled);
 566                 buffer_put_string(&b, mac->key, mac->key_len);
 567         }
 568
 569         /* Comp structure */
 570         buffer_put_int(&b, comp->type);
 571         buffer_put_int(&b, comp->enabled);
 572         buffer_put_cstring(&b, comp->name);
 573
 574         len = buffer_len(&b);
 575         if (lenp != NULL)
 576                 *lenp = len;
 577         if (blobp != NULL) {
 578                 *blobp = xmalloc(len);
 579                 memcpy(*blobp, buffer_ptr(&b), len);
 580         }
 581         explicit_bzero(buffer_ptr(&b), len);
 582         buffer_free(&b);
 583         return len;
 584 }
 585
 586 static void
 587 mm_send_kex(Buffer *m, Kex *kex)
 588 {
 589         buffer_put_string(m, kex->session_id, kex->session_id_len);
 590         buffer_put_int(m, kex->we_need);
 591         buffer_put_int(m, kex->hostkey_type);
 592         buffer_put_int(m, kex->kex_type);
 593         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 594         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 595         buffer_put_int(m, kex->flags);
 596         buffer_put_cstring(m, kex->client_version_string);
 597         buffer_put_cstring(m, kex->server_version_string);
 598 }
 599
 600 void
 601 mm_send_keystate(struct monitor *monitor)
 602 {
 603         Buffer m, *input, *output;
 604         u_char *blob, *p;
 605         u_int bloblen, plen;
 606         u_int32_t seqnr, packets;
 607         u_int64_t blocks, bytes;
 608
 609         buffer_init(&m);
 610
 611         if (!compat20) {
 612                 u_char iv[24];
 613                 u_char *key;
 614                 u_int ivlen, keylen;
 615
 616                 buffer_put_int(&m, packet_get_protocol_flags());
 617
 618                 buffer_put_int(&m, packet_get_ssh1_cipher());
 619
 620                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 621                 keylen = packet_get_encryption_key(NULL);
 622                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 623                 keylen = packet_get_encryption_key(key);
 624                 buffer_put_string(&m, key, keylen);
 625                 explicit_bzero(key, keylen);
 626                 free(key);
 627
 628                 ivlen = packet_get_keyiv_len(MODE_OUT);
 629                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 630                 buffer_put_string(&m, iv, ivlen);
 631                 ivlen = packet_get_keyiv_len(MODE_IN);
 632                 packet_get_keyiv(MODE_IN, iv, ivlen);
 633                 buffer_put_string(&m, iv, ivlen);
 634                 goto skip;
 635         } else {
 636                 /* Kex for rekeying */
 637                 mm_send_kex(&m, *monitor->m_pkex);
 638         }
 639
 640         debug3("%s: Sending new keys: %p %p",
 641             __func__, packet_get_newkeys(MODE_OUT),
 642             packet_get_newkeys(MODE_IN));
 643
 644         /* Keys from Kex */
 645         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 646                 fatal("%s: conversion of newkeys failed", __func__);
 647
 648         buffer_put_string(&m, blob, bloblen);
 649         free(blob);
 650
 651         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 652                 fatal("%s: conversion of newkeys failed", __func__);
 653
 654         buffer_put_string(&m, blob, bloblen);
 655         free(blob);
 656
 657         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes);
 658         buffer_put_int(&m, seqnr);
 659         buffer_put_int64(&m, blocks);
 660         buffer_put_int(&m, packets);
 661         buffer_put_int64(&m, bytes);
 662         packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes);
 663         buffer_put_int(&m, seqnr);
 664         buffer_put_int64(&m, blocks);
 665         buffer_put_int(&m, packets);
 666         buffer_put_int64(&m, bytes);
 667
 668         debug3("%s: New keys have been sent", __func__);
 669  skip:
 670         /* More key context */
 671         plen = packet_get_keycontext(MODE_OUT, NULL);
 672         p = xmalloc(plen+1);
 673         packet_get_keycontext(MODE_OUT, p);
 674         buffer_put_string(&m, p, plen);
 675         free(p);
 676
 677         plen = packet_get_keycontext(MODE_IN, NULL);
 678         p = xmalloc(plen+1);
 679         packet_get_keycontext(MODE_IN, p);
 680         buffer_put_string(&m, p, plen);
 681         free(p);
 682
 683         /* Compression state */
 684         debug3("%s: Sending compression state", __func__);
 685         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 686         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 687
 688         /* Network I/O buffers */
 689         input = (Buffer *)packet_get_input();
 690         output = (Buffer *)packet_get_output();
 691         buffer_put_string(&m, buffer_ptr(input), buffer_len(input));
 692         buffer_put_string(&m, buffer_ptr(output), buffer_len(output));
 693
 694         /* Roaming */
 695         if (compat20) {
 696                 buffer_put_int64(&m, get_sent_bytes());
 697                 buffer_put_int64(&m, get_recv_bytes());
 698         }
 699
 700         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 701         debug3("%s: Finished sending state", __func__);
 702
 703         buffer_free(&m);
 704 }
 705
 706 int
 707 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 708 {
 709         Buffer m;
 710         char *p, *msg;
 711         int success = 0, tmp1 = -1, tmp2 = -1;
 712
 713         /* Kludge: ensure there are fds free to receive the pty/tty */
 714         if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
 715             (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
 716                 error("%s: cannot allocate fds for pty", __func__);
 717                 if (tmp1 > 0)
 718                         close(tmp1);
 719                 if (tmp2 > 0)
 720                         close(tmp2);
 721                 return 0;
 722         }
 723         close(tmp1);
 724         close(tmp2);
 725
 726         buffer_init(&m);
 727         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 728
 729         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 730         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 731
 732         success = buffer_get_int(&m);
 733         if (success == 0) {
 734                 debug3("%s: pty alloc failed", __func__);
 735                 buffer_free(&m);
 736                 return (0);
 737         }
 738         p = buffer_get_string(&m, NULL);
 739         msg = buffer_get_string(&m, NULL);
 740         buffer_free(&m);
 741
 742         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 743         free(p);
 744
 745         buffer_append(&loginmsg, msg, strlen(msg));
 746         free(msg);
 747
 748         if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
 749             (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
 750                 fatal("%s: receive fds failed", __func__);
 751
 752         /* Success */
 753         return (1);
 754 }
 755
 756 void
 757 mm_session_pty_cleanup2(Session *s)
 758 {
 759         Buffer m;
 760
 761         if (s->ttyfd == -1)
 762                 return;
 763         buffer_init(&m);
 764         buffer_put_cstring(&m, s->tty);
 765         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 766         buffer_free(&m);
 767
 768         /* closed dup'ed master */
 769         if (s->ptymaster != -1 && close(s->ptymaster) < 0)
 770                 error("close(s->ptymaster/%d): %s",
 771                     s->ptymaster, strerror(errno));
 772
 773         /* unlink pty from session */
 774         s->ttyfd = -1;
 775 }
 776
 777 #ifdef USE_PAM
 778 void
 779 mm_start_pam(Authctxt *authctxt)
 780 {
 781         Buffer m;
 782
 783         debug3("%s entering", __func__);
 784         if (!options.use_pam)
 785                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 786
 787         buffer_init(&m);
 788         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 789
 790         buffer_free(&m);
 791 }
 792
 793 u_int
 794 mm_do_pam_account(void)
 795 {
 796         Buffer m;
 797         u_int ret;
 798         char *msg;
 799
 800         debug3("%s entering", __func__);
 801         if (!options.use_pam)
 802                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 803
 804         buffer_init(&m);
 805         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 806
 807         mm_request_receive_expect(pmonitor->m_recvfd,
 808             MONITOR_ANS_PAM_ACCOUNT, &m);
 809         ret = buffer_get_int(&m);
 810         msg = buffer_get_string(&m, NULL);
 811         buffer_append(&loginmsg, msg, strlen(msg));
 812         free(msg);
 813
 814         buffer_free(&m);
 815
 816         debug3("%s returning %d", __func__, ret);
 817
 818         return (ret);
 819 }
 820
 821 void *
 822 mm_sshpam_init_ctx(Authctxt *authctxt)
 823 {
 824         Buffer m;
 825         int success;
 826
 827         debug3("%s", __func__);
 828         buffer_init(&m);
 829         buffer_put_cstring(&m, authctxt->user);
 830         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 831         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 832         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 833         success = buffer_get_int(&m);
 834         if (success == 0) {
 835                 debug3("%s: pam_init_ctx failed", __func__);
 836                 buffer_free(&m);
 837                 return (NULL);
 838         }
 839         buffer_free(&m);
 840         return (authctxt);
 841 }
 842
 843 int
 844 mm_sshpam_query(void *ctx, char **name, char **info,
 845     u_int *num, char ***prompts, u_int **echo_on)
 846 {
 847         Buffer m;
 848         u_int i;
 849         int ret;
 850
 851         debug3("%s", __func__);
 852         buffer_init(&m);
 853         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 854         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 855         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 856         ret = buffer_get_int(&m);
 857         debug3("%s: pam_query returned %d", __func__, ret);
 858         *name = buffer_get_string(&m, NULL);
 859         *info = buffer_get_string(&m, NULL);
 860         *num = buffer_get_int(&m);
 861         if (*num > PAM_MAX_NUM_MSG)
 862                 fatal("%s: recieved %u PAM messages, expected <= %u",
 863                     __func__, *num, PAM_MAX_NUM_MSG);
 864         *prompts = xcalloc((*num + 1), sizeof(char *));
 865         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 866         for (i = 0; i < *num; ++i) {
 867                 (*prompts)[i] = buffer_get_string(&m, NULL);
 868                 (*echo_on)[i] = buffer_get_int(&m);
 869         }
 870         buffer_free(&m);
 871         return (ret);
 872 }
 873
 874 int
 875 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 876 {
 877         Buffer m;
 878         u_int i;
 879         int ret;
 880
 881         debug3("%s", __func__);
 882         buffer_init(&m);
 883         buffer_put_int(&m, num);
 884         for (i = 0; i < num; ++i)
 885                 buffer_put_cstring(&m, resp[i]);
 886         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 887         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 888         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 889         ret = buffer_get_int(&m);
 890         debug3("%s: pam_respond returned %d", __func__, ret);
 891         buffer_free(&m);
 892         return (ret);
 893 }
 894
 895 void
 896 mm_sshpam_free_ctx(void *ctxtp)
 897 {
 898         Buffer m;
 899
 900         debug3("%s", __func__);
 901         buffer_init(&m);
 902         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 903         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 904         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 905         buffer_free(&m);
 906 }
 907 #endif /* USE_PAM */
 908
 909 /* Request process termination */
 910
 911 void
 912 mm_terminate(void)
 913 {
 914         Buffer m;
 915
 916         buffer_init(&m);
 917         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 918         buffer_free(&m);
 919 }
 920
 921 #ifdef WITH_SSH1
 922 int
 923 mm_ssh1_session_key(BIGNUM *num)
 924 {
 925         int rsafail;
 926         Buffer m;
 927
 928         buffer_init(&m);
 929         buffer_put_bignum2(&m, num);
 930         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 931
 932         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 933
 934         rsafail = buffer_get_int(&m);
 935         buffer_get_bignum2(&m, num);
 936
 937         buffer_free(&m);
 938
 939         return (rsafail);
 940 }
 941 #endif
 942
 943 static void
 944 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 945     char ***prompts, u_int **echo_on)
 946 {
 947         *name = xstrdup("");
 948         *infotxt = xstrdup("");
 949         *numprompts = 1;
 950         *prompts = xcalloc(*numprompts, sizeof(char *));
 951         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 952         (*echo_on)[0] = 0;
 953 }
 954
 955 int
 956 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 957    u_int *numprompts, char ***prompts, u_int **echo_on)
 958 {
 959         Buffer m;
 960         u_int success;
 961         char *challenge;
 962
 963         debug3("%s: entering", __func__);
 964
 965         buffer_init(&m);
 966         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 967
 968         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 969             &m);
 970         success = buffer_get_int(&m);
 971         if (success == 0) {
 972                 debug3("%s: no challenge", __func__);
 973                 buffer_free(&m);
 974                 return (-1);
 975         }
 976
 977         /* Get the challenge, and format the response */
 978         challenge  = buffer_get_string(&m, NULL);
 979         buffer_free(&m);
 980
 981         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 982         (*prompts)[0] = challenge;
 983
 984         debug3("%s: received challenge: %s", __func__, challenge);
 985
 986         return (0);
 987 }
 988
 989 int
 990 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 991 {
 992         Buffer m;
 993         int authok;
 994
 995         debug3("%s: entering", __func__);
 996         if (numresponses != 1)
 997                 return (-1);
 998
 999         buffer_init(&m);
1000         buffer_put_cstring(&m, responses[0]);
1001         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1002
1003         mm_request_receive_expect(pmonitor->m_recvfd,
1004             MONITOR_ANS_BSDAUTHRESPOND, &m);
1005
1006         authok = buffer_get_int(&m);
1007         buffer_free(&m);
1008
1009         return ((authok == 0) ? -1 : 0);
1010 }
1011
1012 #ifdef SKEY
1013 int
1014 mm_skey_query(void *ctx, char **name, char **infotxt,
1015    u_int *numprompts, char ***prompts, u_int **echo_on)
1016 {
1017         Buffer m;
1018         u_int success;
1019         char *challenge;
1020
1021         debug3("%s: entering", __func__);
1022
1023         buffer_init(&m);
1024         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1025
1026         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1027             &m);
1028         success = buffer_get_int(&m);
1029         if (success == 0) {
1030                 debug3("%s: no challenge", __func__);
1031                 buffer_free(&m);
1032                 return (-1);
1033         }
1034
1035         /* Get the challenge, and format the response */
1036         challenge  = buffer_get_string(&m, NULL);
1037         buffer_free(&m);
1038
1039         debug3("%s: received challenge: %s", __func__, challenge);
1040
1041         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
1042
1043         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1044         free(challenge);
1045
1046         return (0);
1047 }
1048
1049 int
1050 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
1051 {
1052         Buffer m;
1053         int authok;
1054
1055         debug3("%s: entering", __func__);
1056         if (numresponses != 1)
1057                 return (-1);
1058
1059         buffer_init(&m);
1060         buffer_put_cstring(&m, responses[0]);
1061         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1062
1063         mm_request_receive_expect(pmonitor->m_recvfd,
1064             MONITOR_ANS_SKEYRESPOND, &m);
1065
1066         authok = buffer_get_int(&m);
1067         buffer_free(&m);
1068
1069         return ((authok == 0) ? -1 : 0);
1070 }
1071 #endif /* SKEY */
1072
1073 void
1074 mm_ssh1_session_id(u_char session_id[16])
1075 {
1076         Buffer m;
1077         int i;
1078
1079         debug3("%s entering", __func__);
1080
1081         buffer_init(&m);
1082         for (i = 0; i < 16; i++)
1083                 buffer_put_char(&m, session_id[i]);
1084
1085         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1086         buffer_free(&m);
1087 }
1088
1089 #ifdef WITH_SSH1
1090 int
1091 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1092 {
1093         Buffer m;
1094         Key *key;
1095         u_char *blob;
1096         u_int blen;
1097         int allowed = 0, have_forced = 0;
1098
1099         debug3("%s entering", __func__);
1100
1101         buffer_init(&m);
1102         buffer_put_bignum2(&m, client_n);
1103
1104         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1105         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1106
1107         allowed = buffer_get_int(&m);
1108
1109         /* fake forced command */
1110         auth_clear_options();
1111         have_forced = buffer_get_int(&m);
1112         forced_command = have_forced ? xstrdup("true") : NULL;
1113
1114         if (allowed && rkey != NULL) {
1115                 blob = buffer_get_string(&m, &blen);
1116                 if ((key = key_from_blob(blob, blen)) == NULL)
1117                         fatal("%s: key_from_blob failed", __func__);
1118                 *rkey = key;
1119                 free(blob);
1120         }
1121         buffer_free(&m);
1122
1123         return (allowed);
1124 }
1125
1126 BIGNUM *
1127 mm_auth_rsa_generate_challenge(Key *key)
1128 {
1129         Buffer m;
1130         BIGNUM *challenge;
1131         u_char *blob;
1132         u_int blen;
1133
1134         debug3("%s entering", __func__);
1135
1136         if ((challenge = BN_new()) == NULL)
1137                 fatal("%s: BN_new failed", __func__);
1138
1139         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1140         if (key_to_blob(key, &blob, &blen) == 0)
1141                 fatal("%s: key_to_blob failed", __func__);
1142         key->type = KEY_RSA1;
1143
1144         buffer_init(&m);
1145         buffer_put_string(&m, blob, blen);
1146         free(blob);
1147
1148         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1149         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1150
1151         buffer_get_bignum2(&m, challenge);
1152         buffer_free(&m);
1153
1154         return (challenge);
1155 }
1156
1157 int
1158 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1159 {
1160         Buffer m;
1161         u_char *blob;
1162         u_int blen;
1163         int success = 0;
1164
1165         debug3("%s entering", __func__);
1166
1167         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1168         if (key_to_blob(key, &blob, &blen) == 0)
1169                 fatal("%s: key_to_blob failed", __func__);
1170         key->type = KEY_RSA1;
1171
1172         buffer_init(&m);
1173         buffer_put_string(&m, blob, blen);
1174         buffer_put_string(&m, response, 16);
1175         free(blob);
1176
1177         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1178         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1179
1180         success = buffer_get_int(&m);
1181         buffer_free(&m);
1182
1183         return (success);
1184 }
1185 #endif
1186
1187 #ifdef SSH_AUDIT_EVENTS
1188 void
1189 mm_audit_event(ssh_audit_event_t event)
1190 {
1191         Buffer m;
1192
1193         debug3("%s entering", __func__);
1194
1195         buffer_init(&m);
1196         buffer_put_int(&m, event);
1197
1198         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1199         buffer_free(&m);
1200 }
1201
1202 void
1203 mm_audit_run_command(const char *command)
1204 {
1205         Buffer m;
1206
1207         debug3("%s entering command %s", __func__, command);
1208
1209         buffer_init(&m);
1210         buffer_put_cstring(&m, command);
1211
1212         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1213         buffer_free(&m);
1214 }
1215 #endif /* SSH_AUDIT_EVENTS */
1216
1217 #ifdef GSSAPI
1218 OM_uint32
1219 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1220 {
1221         Buffer m;
1222         OM_uint32 major;
1223
1224         /* Client doesn't get to see the context */
1225         *ctx = NULL;
1226
1227         buffer_init(&m);
1228         buffer_put_string(&m, goid->elements, goid->length);
1229
1230         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1231         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1232
1233         major = buffer_get_int(&m);
1234
1235         buffer_free(&m);
1236         return (major);
1237 }
1238
1239 OM_uint32
1240 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1241     gss_buffer_desc *out, OM_uint32 *flags)
1242 {
1243         Buffer m;
1244         OM_uint32 major;
1245         u_int len;
1246
1247         buffer_init(&m);
1248         buffer_put_string(&m, in->value, in->length);
1249
1250         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1251         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1252
1253         major = buffer_get_int(&m);
1254         out->value = buffer_get_string(&m, &len);
1255         out->length = len;
1256         if (flags)
1257                 *flags = buffer_get_int(&m);
1258
1259         buffer_free(&m);
1260
1261         return (major);
1262 }
1263
1264 OM_uint32
1265 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1266 {
1267         Buffer m;
1268         OM_uint32 major;
1269
1270         buffer_init(&m);
1271         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1272         buffer_put_string(&m, gssmic->value, gssmic->length);
1273
1274         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1275         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1276             &m);
1277
1278         major = buffer_get_int(&m);
1279         buffer_free(&m);
1280         return(major);
1281 }
1282
1283 int
1284 mm_ssh_gssapi_userok(char *user)
1285 {
1286         Buffer m;
1287         int authenticated = 0;
1288
1289         buffer_init(&m);
1290
1291         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1292         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1293                                   &m);
1294
1295         authenticated = buffer_get_int(&m);
1296
1297         buffer_free(&m);
1298         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1299         return (authenticated);
1300 }
1301 #endif /* GSSAPI */
1302