crypto/openssh-5/monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.63 2008/07/10 18:08:11 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 #include <openssl/bn.h>
  42 #include <openssl/dh.h>
  43
  44 #include "openbsd-compat/sys-queue.h"
  45 #include "xmalloc.h"
  46 #include "ssh.h"
  47 #include "dh.h"
  48 #include "buffer.h"
  49 #include "key.h"
  50 #include "cipher.h"
  51 #include "kex.h"
  52 #include "hostfile.h"
  53 #include "auth.h"
  54 #include "auth-options.h"
  55 #include "packet.h"
  56 #include "mac.h"
  57 #include "log.h"
  58 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  59 #undef TARGET_OS_MAC
  60 #include "zlib.h"
  61 #define TARGET_OS_MAC 1
  62 #else
  63 #include "zlib.h"
  64 #endif
  65 #include "monitor.h"
  66 #ifdef GSSAPI
  67 #include "ssh-gss.h"
  68 #endif
  69 #include "monitor_wrap.h"
  70 #include "atomicio.h"
  71 #include "monitor_fdpass.h"
  72 #include "misc.h"
  73 #include "servconf.h"
  74
  75 #include "channels.h"
  76 #include "session.h"
  77 #include "servconf.h"
  78
  79 /* Imports */
  80 extern int compat20;
  81 extern Newkeys *newkeys[];
  82 extern z_stream incoming_stream;
  83 extern z_stream outgoing_stream;
  84 extern struct monitor *pmonitor;
  85 extern Buffer input, output;
  86 extern Buffer loginmsg;
  87 extern ServerOptions options;
  88
  89 int
  90 mm_is_monitor(void)
  91 {
  92         /*
  93          * m_pid is only set in the privileged part, and
  94          * points to the unprivileged child.
  95          */
  96         return (pmonitor && pmonitor->m_pid > 0);
  97 }
  98
  99 void
 100 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
 101 {
 102         u_int mlen = buffer_len(m);
 103         u_char buf[5];
 104
 105         debug3("%s entering: type %d", __func__, type);
 106
 107         put_u32(buf, mlen + 1);
 108         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 109         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 110                 fatal("%s: write: %s", __func__, strerror(errno));
 111         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 112                 fatal("%s: write: %s", __func__, strerror(errno));
 113 }
 114
 115 void
 116 mm_request_receive(int sock, Buffer *m)
 117 {
 118         u_char buf[4];
 119         u_int msg_len;
 120
 121         debug3("%s entering", __func__);
 122
 123         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 124                 if (errno == EPIPE)
 125                         cleanup_exit(255);
 126                 fatal("%s: read: %s", __func__, strerror(errno));
 127         }
 128         msg_len = get_u32(buf);
 129         if (msg_len > 256 * 1024)
 130                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 131         buffer_clear(m);
 132         buffer_append_space(m, msg_len);
 133         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 134                 fatal("%s: read: %s", __func__, strerror(errno));
 135 }
 136
 137 void
 138 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 139 {
 140         u_char rtype;
 141
 142         debug3("%s entering: type %d", __func__, type);
 143
 144         mm_request_receive(sock, m);
 145         rtype = buffer_get_char(m);
 146         if (rtype != type)
 147                 fatal("%s: read: rtype %d != type %d", __func__,
 148                     rtype, type);
 149 }
 150
 151 DH *
 152 mm_choose_dh(int min, int nbits, int max)
 153 {
 154         BIGNUM *p, *g;
 155         int success = 0;
 156         Buffer m;
 157
 158         buffer_init(&m);
 159         buffer_put_int(&m, min);
 160         buffer_put_int(&m, nbits);
 161         buffer_put_int(&m, max);
 162
 163         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 164
 165         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 166         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 167
 168         success = buffer_get_char(&m);
 169         if (success == 0)
 170                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 171
 172         if ((p = BN_new()) == NULL)
 173                 fatal("%s: BN_new failed", __func__);
 174         if ((g = BN_new()) == NULL)
 175                 fatal("%s: BN_new failed", __func__);
 176         buffer_get_bignum2(&m, p);
 177         buffer_get_bignum2(&m, g);
 178
 179         debug3("%s: remaining %d", __func__, buffer_len(&m));
 180         buffer_free(&m);
 181
 182         return (dh_new_group(g, p));
 183 }
 184
 185 int
 186 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 187 {
 188         Kex *kex = *pmonitor->m_pkex;
 189         Buffer m;
 190
 191         debug3("%s entering", __func__);
 192
 193         buffer_init(&m);
 194         buffer_put_int(&m, kex->host_key_index(key));
 195         buffer_put_string(&m, data, datalen);
 196
 197         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 198
 199         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 200         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 201         *sigp  = buffer_get_string(&m, lenp);
 202         buffer_free(&m);
 203
 204         return (0);
 205 }
 206
 207 struct passwd *
 208 mm_getpwnamallow(const char *username)
 209 {
 210         Buffer m;
 211         struct passwd *pw;
 212         u_int len;
 213         ServerOptions *newopts;
 214
 215         debug3("%s entering", __func__);
 216
 217         buffer_init(&m);
 218         buffer_put_cstring(&m, username);
 219
 220         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 221
 222         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 223         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 224
 225         if (buffer_get_char(&m) == 0) {
 226                 pw = NULL;
 227                 goto out;
 228         }
 229         pw = buffer_get_string(&m, &len);
 230         if (len != sizeof(struct passwd))
 231                 fatal("%s: struct passwd size mismatch", __func__);
 232         pw->pw_name = buffer_get_string(&m, NULL);
 233         pw->pw_passwd = buffer_get_string(&m, NULL);
 234         pw->pw_gecos = buffer_get_string(&m, NULL);
 235 #ifdef HAVE_PW_CLASS_IN_PASSWD
 236         pw->pw_class = buffer_get_string(&m, NULL);
 237 #endif
 238         pw->pw_dir = buffer_get_string(&m, NULL);
 239         pw->pw_shell = buffer_get_string(&m, NULL);
 240
 241 out:
 242         /* copy options block as a Match directive may have changed some */
 243         newopts = buffer_get_string(&m, &len);
 244         if (len != sizeof(*newopts))
 245                 fatal("%s: option block size mismatch", __func__);
 246         if (newopts->banner != NULL)
 247                 newopts->banner = buffer_get_string(&m, NULL);
 248         copy_set_server_options(&options, newopts, 1);
 249         xfree(newopts);
 250
 251         buffer_free(&m);
 252
 253         return (pw);
 254 }
 255
 256 char *
 257 mm_auth2_read_banner(void)
 258 {
 259         Buffer m;
 260         char *banner;
 261
 262         debug3("%s entering", __func__);
 263
 264         buffer_init(&m);
 265         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 266         buffer_clear(&m);
 267
 268         mm_request_receive_expect(pmonitor->m_recvfd,
 269             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 270         banner = buffer_get_string(&m, NULL);
 271         buffer_free(&m);
 272
 273         /* treat empty banner as missing banner */
 274         if (strlen(banner) == 0) {
 275                 xfree(banner);
 276                 banner = NULL;
 277         }
 278         return (banner);
 279 }
 280
 281 /* Inform the privileged process about service and style */
 282
 283 void
 284 mm_inform_authserv(char *service, char *style)
 285 {
 286         Buffer m;
 287
 288         debug3("%s entering", __func__);
 289
 290         buffer_init(&m);
 291         buffer_put_cstring(&m, service);
 292         buffer_put_cstring(&m, style ? style : "");
 293
 294         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 295
 296         buffer_free(&m);
 297 }
 298
 299 /* Do the password authentication */
 300 int
 301 mm_auth_password(Authctxt *authctxt, char *password)
 302 {
 303         Buffer m;
 304         int authenticated = 0;
 305
 306         debug3("%s entering", __func__);
 307
 308         buffer_init(&m);
 309         buffer_put_cstring(&m, password);
 310         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 311
 312         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 313         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 314
 315         authenticated = buffer_get_int(&m);
 316
 317         buffer_free(&m);
 318
 319         debug3("%s: user %sauthenticated",
 320             __func__, authenticated ? "" : "not ");
 321         return (authenticated);
 322 }
 323
 324 int
 325 mm_user_key_allowed(struct passwd *pw, Key *key)
 326 {
 327         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 328 }
 329
 330 int
 331 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 332     Key *key)
 333 {
 334         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 335 }
 336
 337 int
 338 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 339     char *host, Key *key)
 340 {
 341         int ret;
 342
 343         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 344         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 345         key->type = KEY_RSA1;
 346         return (ret);
 347 }
 348
 349 static void
 350 mm_send_debug(Buffer *m)
 351 {
 352         char *msg;
 353
 354         while (buffer_len(m)) {
 355                 msg = buffer_get_string(m, NULL);
 356                 debug3("%s: Sending debug: %s", __func__, msg);
 357                 packet_send_debug("%s", msg);
 358                 xfree(msg);
 359         }
 360 }
 361
 362 int
 363 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 364 {
 365         Buffer m;
 366         u_char *blob;
 367         u_int len;
 368         int allowed = 0, have_forced = 0;
 369
 370         debug3("%s entering", __func__);
 371
 372         /* Convert the key to a blob and the pass it over */
 373         if (!key_to_blob(key, &blob, &len))
 374                 return (0);
 375
 376         buffer_init(&m);
 377         buffer_put_int(&m, type);
 378         buffer_put_cstring(&m, user ? user : "");
 379         buffer_put_cstring(&m, host ? host : "");
 380         buffer_put_string(&m, blob, len);
 381         xfree(blob);
 382
 383         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 384
 385         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 386         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 387
 388         allowed = buffer_get_int(&m);
 389
 390         /* fake forced command */
 391         auth_clear_options();
 392         have_forced = buffer_get_int(&m);
 393         forced_command = have_forced ? xstrdup("true") : NULL;
 394
 395         /* Send potential debug messages */
 396         mm_send_debug(&m);
 397
 398         buffer_free(&m);
 399
 400         return (allowed);
 401 }
 402
 403 /*
 404  * This key verify needs to send the key type along, because the
 405  * privileged parent makes the decision if the key is allowed
 406  * for authentication.
 407  */
 408
 409 int
 410 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 411 {
 412         Buffer m;
 413         u_char *blob;
 414         u_int len;
 415         int verified = 0;
 416
 417         debug3("%s entering", __func__);
 418
 419         /* Convert the key to a blob and the pass it over */
 420         if (!key_to_blob(key, &blob, &len))
 421                 return (0);
 422
 423         buffer_init(&m);
 424         buffer_put_string(&m, blob, len);
 425         buffer_put_string(&m, sig, siglen);
 426         buffer_put_string(&m, data, datalen);
 427         xfree(blob);
 428
 429         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 430
 431         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 432         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 433
 434         verified = buffer_get_int(&m);
 435
 436         buffer_free(&m);
 437
 438         return (verified);
 439 }
 440
 441 /* Export key state after authentication */
 442 Newkeys *
 443 mm_newkeys_from_blob(u_char *blob, int blen)
 444 {
 445         Buffer b;
 446         u_int len;
 447         Newkeys *newkey = NULL;
 448         Enc *enc;
 449         Mac *mac;
 450         Comp *comp;
 451
 452         debug3("%s: %p(%d)", __func__, blob, blen);
 453 #ifdef DEBUG_PK
 454         dump_base64(stderr, blob, blen);
 455 #endif
 456         buffer_init(&b);
 457         buffer_append(&b, blob, blen);
 458
 459         newkey = xmalloc(sizeof(*newkey));
 460         enc = &newkey->enc;
 461         mac = &newkey->mac;
 462         comp = &newkey->comp;
 463
 464         /* Enc structure */
 465         enc->name = buffer_get_string(&b, NULL);
 466         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 467         enc->enabled = buffer_get_int(&b);
 468         enc->block_size = buffer_get_int(&b);
 469         enc->key = buffer_get_string(&b, &enc->key_len);
 470         enc->iv = buffer_get_string(&b, &len);
 471         if (len != enc->block_size)
 472                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 473                     enc->block_size, len);
 474
 475         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 476                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 477                     enc->name, enc->cipher);
 478
 479         /* Mac structure */
 480         mac->name = buffer_get_string(&b, NULL);
 481         if (mac->name == NULL || mac_setup(mac, mac->name) == -1)
 482                 fatal("%s: can not setup mac %s", __func__, mac->name);
 483         mac->enabled = buffer_get_int(&b);
 484         mac->key = buffer_get_string(&b, &len);
 485         if (len > mac->key_len)
 486                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 487                     mac->key_len);
 488         mac->key_len = len;
 489
 490         /* Comp structure */
 491         comp->type = buffer_get_int(&b);
 492         comp->enabled = buffer_get_int(&b);
 493         comp->name = buffer_get_string(&b, NULL);
 494
 495         len = buffer_len(&b);
 496         if (len != 0)
 497                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 498         buffer_free(&b);
 499         return (newkey);
 500 }
 501
 502 int
 503 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 504 {
 505         Buffer b;
 506         int len;
 507         Enc *enc;
 508         Mac *mac;
 509         Comp *comp;
 510         Newkeys *newkey = newkeys[mode];
 511
 512         debug3("%s: converting %p", __func__, newkey);
 513
 514         if (newkey == NULL) {
 515                 error("%s: newkey == NULL", __func__);
 516                 return 0;
 517         }
 518         enc = &newkey->enc;
 519         mac = &newkey->mac;
 520         comp = &newkey->comp;
 521
 522         buffer_init(&b);
 523         /* Enc structure */
 524         buffer_put_cstring(&b, enc->name);
 525         /* The cipher struct is constant and shared, you export pointer */
 526         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 527         buffer_put_int(&b, enc->enabled);
 528         buffer_put_int(&b, enc->block_size);
 529         buffer_put_string(&b, enc->key, enc->key_len);
 530         packet_get_keyiv(mode, enc->iv, enc->block_size);
 531         buffer_put_string(&b, enc->iv, enc->block_size);
 532
 533         /* Mac structure */
 534         buffer_put_cstring(&b, mac->name);
 535         buffer_put_int(&b, mac->enabled);
 536         buffer_put_string(&b, mac->key, mac->key_len);
 537
 538         /* Comp structure */
 539         buffer_put_int(&b, comp->type);
 540         buffer_put_int(&b, comp->enabled);
 541         buffer_put_cstring(&b, comp->name);
 542
 543         len = buffer_len(&b);
 544         if (lenp != NULL)
 545                 *lenp = len;
 546         if (blobp != NULL) {
 547                 *blobp = xmalloc(len);
 548                 memcpy(*blobp, buffer_ptr(&b), len);
 549         }
 550         memset(buffer_ptr(&b), 0, len);
 551         buffer_free(&b);
 552         return len;
 553 }
 554
 555 static void
 556 mm_send_kex(Buffer *m, Kex *kex)
 557 {
 558         buffer_put_string(m, kex->session_id, kex->session_id_len);
 559         buffer_put_int(m, kex->we_need);
 560         buffer_put_int(m, kex->hostkey_type);
 561         buffer_put_int(m, kex->kex_type);
 562         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 563         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 564         buffer_put_int(m, kex->flags);
 565         buffer_put_cstring(m, kex->client_version_string);
 566         buffer_put_cstring(m, kex->server_version_string);
 567 }
 568
 569 void
 570 mm_send_keystate(struct monitor *monitor)
 571 {
 572         Buffer m;
 573         u_char *blob, *p;
 574         u_int bloblen, plen;
 575         u_int32_t seqnr, packets;
 576         u_int64_t blocks, bytes;
 577
 578         buffer_init(&m);
 579
 580         if (!compat20) {
 581                 u_char iv[24];
 582                 u_char *key;
 583                 u_int ivlen, keylen;
 584
 585                 buffer_put_int(&m, packet_get_protocol_flags());
 586
 587                 buffer_put_int(&m, packet_get_ssh1_cipher());
 588
 589                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 590                 keylen = packet_get_encryption_key(NULL);
 591                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 592                 keylen = packet_get_encryption_key(key);
 593                 buffer_put_string(&m, key, keylen);
 594                 memset(key, 0, keylen);
 595                 xfree(key);
 596
 597                 ivlen = packet_get_keyiv_len(MODE_OUT);
 598                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 599                 buffer_put_string(&m, iv, ivlen);
 600                 ivlen = packet_get_keyiv_len(MODE_OUT);
 601                 packet_get_keyiv(MODE_IN, iv, ivlen);
 602                 buffer_put_string(&m, iv, ivlen);
 603                 goto skip;
 604         } else {
 605                 /* Kex for rekeying */
 606                 mm_send_kex(&m, *monitor->m_pkex);
 607         }
 608
 609         debug3("%s: Sending new keys: %p %p",
 610             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 611
 612         /* Keys from Kex */
 613         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 614                 fatal("%s: conversion of newkeys failed", __func__);
 615
 616         buffer_put_string(&m, blob, bloblen);
 617         xfree(blob);
 618
 619         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 620                 fatal("%s: conversion of newkeys failed", __func__);
 621
 622         buffer_put_string(&m, blob, bloblen);
 623         xfree(blob);
 624
 625         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes);
 626         buffer_put_int(&m, seqnr);
 627         buffer_put_int64(&m, blocks);
 628         buffer_put_int(&m, packets);
 629         buffer_put_int64(&m, bytes);
 630         packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes);
 631         buffer_put_int(&m, seqnr);
 632         buffer_put_int64(&m, blocks);
 633         buffer_put_int(&m, packets);
 634         buffer_put_int64(&m, bytes);
 635
 636         debug3("%s: New keys have been sent", __func__);
 637  skip:
 638         /* More key context */
 639         plen = packet_get_keycontext(MODE_OUT, NULL);
 640         p = xmalloc(plen+1);
 641         packet_get_keycontext(MODE_OUT, p);
 642         buffer_put_string(&m, p, plen);
 643         xfree(p);
 644
 645         plen = packet_get_keycontext(MODE_IN, NULL);
 646         p = xmalloc(plen+1);
 647         packet_get_keycontext(MODE_IN, p);
 648         buffer_put_string(&m, p, plen);
 649         xfree(p);
 650
 651         /* Compression state */
 652         debug3("%s: Sending compression state", __func__);
 653         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 654         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 655
 656         /* Network I/O buffers */
 657         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 658         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 659
 660         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 661         debug3("%s: Finished sending state", __func__);
 662
 663         buffer_free(&m);
 664 }
 665
 666 int
 667 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 668 {
 669         Buffer m;
 670         char *p, *msg;
 671         int success = 0, tmp1 = -1, tmp2 = -1;
 672
 673         /* Kludge: ensure there are fds free to receive the pty/tty */
 674         if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
 675             (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
 676                 error("%s: cannot allocate fds for pty", __func__);
 677                 if (tmp1 > 0)
 678                         close(tmp1);
 679                 if (tmp2 > 0)
 680                         close(tmp2);
 681                 return 0;
 682         }
 683         close(tmp1);
 684         close(tmp2);
 685
 686         buffer_init(&m);
 687         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 688
 689         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 690         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 691
 692         success = buffer_get_int(&m);
 693         if (success == 0) {
 694                 debug3("%s: pty alloc failed", __func__);
 695                 buffer_free(&m);
 696                 return (0);
 697         }
 698         p = buffer_get_string(&m, NULL);
 699         msg = buffer_get_string(&m, NULL);
 700         buffer_free(&m);
 701
 702         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 703         xfree(p);
 704
 705         buffer_append(&loginmsg, msg, strlen(msg));
 706         xfree(msg);
 707
 708         if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
 709             (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
 710                 fatal("%s: receive fds failed", __func__);
 711
 712         /* Success */
 713         return (1);
 714 }
 715
 716 void
 717 mm_session_pty_cleanup2(Session *s)
 718 {
 719         Buffer m;
 720
 721         if (s->ttyfd == -1)
 722                 return;
 723         buffer_init(&m);
 724         buffer_put_cstring(&m, s->tty);
 725         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 726         buffer_free(&m);
 727
 728         /* closed dup'ed master */
 729         if (s->ptymaster != -1 && close(s->ptymaster) < 0)
 730                 error("close(s->ptymaster/%d): %s",
 731                     s->ptymaster, strerror(errno));
 732
 733         /* unlink pty from session */
 734         s->ttyfd = -1;
 735 }
 736
 737 #ifdef USE_PAM
 738 void
 739 mm_start_pam(Authctxt *authctxt)
 740 {
 741         Buffer m;
 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_START, &m);
 749
 750         buffer_free(&m);
 751 }
 752
 753 u_int
 754 mm_do_pam_account(void)
 755 {
 756         Buffer m;
 757         u_int ret;
 758         char *msg;
 759
 760         debug3("%s entering", __func__);
 761         if (!options.use_pam)
 762                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 763
 764         buffer_init(&m);
 765         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 766
 767         mm_request_receive_expect(pmonitor->m_recvfd,
 768             MONITOR_ANS_PAM_ACCOUNT, &m);
 769         ret = buffer_get_int(&m);
 770         msg = buffer_get_string(&m, NULL);
 771         buffer_append(&loginmsg, msg, strlen(msg));
 772         xfree(msg);
 773
 774         buffer_free(&m);
 775
 776         debug3("%s returning %d", __func__, ret);
 777
 778         return (ret);
 779 }
 780
 781 void *
 782 mm_sshpam_init_ctx(Authctxt *authctxt)
 783 {
 784         Buffer m;
 785         int success;
 786
 787         debug3("%s", __func__);
 788         buffer_init(&m);
 789         buffer_put_cstring(&m, authctxt->user);
 790         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 791         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 792         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 793         success = buffer_get_int(&m);
 794         if (success == 0) {
 795                 debug3("%s: pam_init_ctx failed", __func__);
 796                 buffer_free(&m);
 797                 return (NULL);
 798         }
 799         buffer_free(&m);
 800         return (authctxt);
 801 }
 802
 803 int
 804 mm_sshpam_query(void *ctx, char **name, char **info,
 805     u_int *num, char ***prompts, u_int **echo_on)
 806 {
 807         Buffer m;
 808         u_int i;
 809         int ret;
 810
 811         debug3("%s", __func__);
 812         buffer_init(&m);
 813         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 814         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 815         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 816         ret = buffer_get_int(&m);
 817         debug3("%s: pam_query returned %d", __func__, ret);
 818         *name = buffer_get_string(&m, NULL);
 819         *info = buffer_get_string(&m, NULL);
 820         *num = buffer_get_int(&m);
 821         if (*num > PAM_MAX_NUM_MSG)
 822                 fatal("%s: recieved %u PAM messages, expected <= %u",
 823                     __func__, *num, PAM_MAX_NUM_MSG);
 824         *prompts = xcalloc((*num + 1), sizeof(char *));
 825         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 826         for (i = 0; i < *num; ++i) {
 827                 (*prompts)[i] = buffer_get_string(&m, NULL);
 828                 (*echo_on)[i] = buffer_get_int(&m);
 829         }
 830         buffer_free(&m);
 831         return (ret);
 832 }
 833
 834 int
 835 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 836 {
 837         Buffer m;
 838         u_int i;
 839         int ret;
 840
 841         debug3("%s", __func__);
 842         buffer_init(&m);
 843         buffer_put_int(&m, num);
 844         for (i = 0; i < num; ++i)
 845                 buffer_put_cstring(&m, resp[i]);
 846         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 847         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 848         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 849         ret = buffer_get_int(&m);
 850         debug3("%s: pam_respond returned %d", __func__, ret);
 851         buffer_free(&m);
 852         return (ret);
 853 }
 854
 855 void
 856 mm_sshpam_free_ctx(void *ctxtp)
 857 {
 858         Buffer m;
 859
 860         debug3("%s", __func__);
 861         buffer_init(&m);
 862         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 863         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 864         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 865         buffer_free(&m);
 866 }
 867 #endif /* USE_PAM */
 868
 869 /* Request process termination */
 870
 871 void
 872 mm_terminate(void)
 873 {
 874         Buffer m;
 875
 876         buffer_init(&m);
 877         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 878         buffer_free(&m);
 879 }
 880
 881 int
 882 mm_ssh1_session_key(BIGNUM *num)
 883 {
 884         int rsafail;
 885         Buffer m;
 886
 887         buffer_init(&m);
 888         buffer_put_bignum2(&m, num);
 889         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 890
 891         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 892
 893         rsafail = buffer_get_int(&m);
 894         buffer_get_bignum2(&m, num);
 895
 896         buffer_free(&m);
 897
 898         return (rsafail);
 899 }
 900
 901 static void
 902 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 903     char ***prompts, u_int **echo_on)
 904 {
 905         *name = xstrdup("");
 906         *infotxt = xstrdup("");
 907         *numprompts = 1;
 908         *prompts = xcalloc(*numprompts, sizeof(char *));
 909         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 910         (*echo_on)[0] = 0;
 911 }
 912
 913 int
 914 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 915    u_int *numprompts, char ***prompts, u_int **echo_on)
 916 {
 917         Buffer m;
 918         u_int success;
 919         char *challenge;
 920
 921         debug3("%s: entering", __func__);
 922
 923         buffer_init(&m);
 924         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 925
 926         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 927             &m);
 928         success = buffer_get_int(&m);
 929         if (success == 0) {
 930                 debug3("%s: no challenge", __func__);
 931                 buffer_free(&m);
 932                 return (-1);
 933         }
 934
 935         /* Get the challenge, and format the response */
 936         challenge  = buffer_get_string(&m, NULL);
 937         buffer_free(&m);
 938
 939         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 940         (*prompts)[0] = challenge;
 941
 942         debug3("%s: received challenge: %s", __func__, challenge);
 943
 944         return (0);
 945 }
 946
 947 int
 948 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 949 {
 950         Buffer m;
 951         int authok;
 952
 953         debug3("%s: entering", __func__);
 954         if (numresponses != 1)
 955                 return (-1);
 956
 957         buffer_init(&m);
 958         buffer_put_cstring(&m, responses[0]);
 959         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 960
 961         mm_request_receive_expect(pmonitor->m_recvfd,
 962             MONITOR_ANS_BSDAUTHRESPOND, &m);
 963
 964         authok = buffer_get_int(&m);
 965         buffer_free(&m);
 966
 967         return ((authok == 0) ? -1 : 0);
 968 }
 969
 970 #ifdef SKEY
 971 int
 972 mm_skey_query(void *ctx, char **name, char **infotxt,
 973    u_int *numprompts, char ***prompts, u_int **echo_on)
 974 {
 975         Buffer m;
 976         u_int success;
 977         char *challenge;
 978
 979         debug3("%s: entering", __func__);
 980
 981         buffer_init(&m);
 982         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 983
 984         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 985             &m);
 986         success = buffer_get_int(&m);
 987         if (success == 0) {
 988                 debug3("%s: no challenge", __func__);
 989                 buffer_free(&m);
 990                 return (-1);
 991         }
 992
 993         /* Get the challenge, and format the response */
 994         challenge  = buffer_get_string(&m, NULL);
 995         buffer_free(&m);
 996
 997         debug3("%s: received challenge: %s", __func__, challenge);
 998
 999         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
1000
1001         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1002         xfree(challenge);
1003
1004         return (0);
1005 }
1006
1007 int
1008 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
1009 {
1010         Buffer m;
1011         int authok;
1012
1013         debug3("%s: entering", __func__);
1014         if (numresponses != 1)
1015                 return (-1);
1016
1017         buffer_init(&m);
1018         buffer_put_cstring(&m, responses[0]);
1019         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1020
1021         mm_request_receive_expect(pmonitor->m_recvfd,
1022             MONITOR_ANS_SKEYRESPOND, &m);
1023
1024         authok = buffer_get_int(&m);
1025         buffer_free(&m);
1026
1027         return ((authok == 0) ? -1 : 0);
1028 }
1029 #endif /* SKEY */
1030
1031 void
1032 mm_ssh1_session_id(u_char session_id[16])
1033 {
1034         Buffer m;
1035         int i;
1036
1037         debug3("%s entering", __func__);
1038
1039         buffer_init(&m);
1040         for (i = 0; i < 16; i++)
1041                 buffer_put_char(&m, session_id[i]);
1042
1043         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1044         buffer_free(&m);
1045 }
1046
1047 int
1048 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1049 {
1050         Buffer m;
1051         Key *key;
1052         u_char *blob;
1053         u_int blen;
1054         int allowed = 0, have_forced = 0;
1055
1056         debug3("%s entering", __func__);
1057
1058         buffer_init(&m);
1059         buffer_put_bignum2(&m, client_n);
1060
1061         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1062         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1063
1064         allowed = buffer_get_int(&m);
1065
1066         /* fake forced command */
1067         auth_clear_options();
1068         have_forced = buffer_get_int(&m);
1069         forced_command = have_forced ? xstrdup("true") : NULL;
1070
1071         if (allowed && rkey != NULL) {
1072                 blob = buffer_get_string(&m, &blen);
1073                 if ((key = key_from_blob(blob, blen)) == NULL)
1074                         fatal("%s: key_from_blob failed", __func__);
1075                 *rkey = key;
1076                 xfree(blob);
1077         }
1078         mm_send_debug(&m);
1079         buffer_free(&m);
1080
1081         return (allowed);
1082 }
1083
1084 BIGNUM *
1085 mm_auth_rsa_generate_challenge(Key *key)
1086 {
1087         Buffer m;
1088         BIGNUM *challenge;
1089         u_char *blob;
1090         u_int blen;
1091
1092         debug3("%s entering", __func__);
1093
1094         if ((challenge = BN_new()) == NULL)
1095                 fatal("%s: BN_new failed", __func__);
1096
1097         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1098         if (key_to_blob(key, &blob, &blen) == 0)
1099                 fatal("%s: key_to_blob failed", __func__);
1100         key->type = KEY_RSA1;
1101
1102         buffer_init(&m);
1103         buffer_put_string(&m, blob, blen);
1104         xfree(blob);
1105
1106         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1107         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1108
1109         buffer_get_bignum2(&m, challenge);
1110         buffer_free(&m);
1111
1112         return (challenge);
1113 }
1114
1115 int
1116 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1117 {
1118         Buffer m;
1119         u_char *blob;
1120         u_int blen;
1121         int success = 0;
1122
1123         debug3("%s entering", __func__);
1124
1125         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1126         if (key_to_blob(key, &blob, &blen) == 0)
1127                 fatal("%s: key_to_blob failed", __func__);
1128         key->type = KEY_RSA1;
1129
1130         buffer_init(&m);
1131         buffer_put_string(&m, blob, blen);
1132         buffer_put_string(&m, response, 16);
1133         xfree(blob);
1134
1135         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1136         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1137
1138         success = buffer_get_int(&m);
1139         buffer_free(&m);
1140
1141         return (success);
1142 }
1143
1144 #ifdef SSH_AUDIT_EVENTS
1145 void
1146 mm_audit_event(ssh_audit_event_t event)
1147 {
1148         Buffer m;
1149
1150         debug3("%s entering", __func__);
1151
1152         buffer_init(&m);
1153         buffer_put_int(&m, event);
1154
1155         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1156         buffer_free(&m);
1157 }
1158
1159 void
1160 mm_audit_run_command(const char *command)
1161 {
1162         Buffer m;
1163
1164         debug3("%s entering command %s", __func__, command);
1165
1166         buffer_init(&m);
1167         buffer_put_cstring(&m, command);
1168
1169         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1170         buffer_free(&m);
1171 }
1172 #endif /* SSH_AUDIT_EVENTS */
1173
1174 #ifdef GSSAPI
1175 OM_uint32
1176 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1177 {
1178         Buffer m;
1179         OM_uint32 major;
1180
1181         /* Client doesn't get to see the context */
1182         *ctx = NULL;
1183
1184         buffer_init(&m);
1185         buffer_put_string(&m, goid->elements, goid->length);
1186
1187         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1188         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1189
1190         major = buffer_get_int(&m);
1191
1192         buffer_free(&m);
1193         return (major);
1194 }
1195
1196 OM_uint32
1197 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1198     gss_buffer_desc *out, OM_uint32 *flags)
1199 {
1200         Buffer m;
1201         OM_uint32 major;
1202         u_int len;
1203
1204         buffer_init(&m);
1205         buffer_put_string(&m, in->value, in->length);
1206
1207         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1208         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1209
1210         major = buffer_get_int(&m);
1211         out->value = buffer_get_string(&m, &len);
1212         out->length = len;
1213         if (flags)
1214                 *flags = buffer_get_int(&m);
1215
1216         buffer_free(&m);
1217
1218         return (major);
1219 }
1220
1221 OM_uint32
1222 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1223 {
1224         Buffer m;
1225         OM_uint32 major;
1226
1227         buffer_init(&m);
1228         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1229         buffer_put_string(&m, gssmic->value, gssmic->length);
1230
1231         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1232         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1233             &m);
1234
1235         major = buffer_get_int(&m);
1236         buffer_free(&m);
1237         return(major);
1238 }
1239
1240 int
1241 mm_ssh_gssapi_userok(char *user)
1242 {
1243         Buffer m;
1244         int authenticated = 0;
1245
1246         buffer_init(&m);
1247
1248         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1249         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1250                                   &m);
1251
1252         authenticated = buffer_get_int(&m);
1253
1254         buffer_free(&m);
1255         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1256         return (authenticated);
1257 }
1258 #endif /* GSSAPI */