monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.62 2008/05/08 12:21:16 djm 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;
 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);
 626         buffer_put_int(&m, seqnr);
 627         buffer_put_int64(&m, blocks);
 628         buffer_put_int(&m, packets);
 629         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 630         buffer_put_int(&m, seqnr);
 631         buffer_put_int64(&m, blocks);
 632         buffer_put_int(&m, packets);
 633
 634         debug3("%s: New keys have been sent", __func__);
 635  skip:
 636         /* More key context */
 637         plen = packet_get_keycontext(MODE_OUT, NULL);
 638         p = xmalloc(plen+1);
 639         packet_get_keycontext(MODE_OUT, p);
 640         buffer_put_string(&m, p, plen);
 641         xfree(p);
 642
 643         plen = packet_get_keycontext(MODE_IN, NULL);
 644         p = xmalloc(plen+1);
 645         packet_get_keycontext(MODE_IN, p);
 646         buffer_put_string(&m, p, plen);
 647         xfree(p);
 648
 649         /* Compression state */
 650         debug3("%s: Sending compression state", __func__);
 651         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 652         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 653
 654         /* Network I/O buffers */
 655         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 656         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 657
 658         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 659         debug3("%s: Finished sending state", __func__);
 660
 661         buffer_free(&m);
 662 }
 663
 664 int
 665 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 666 {
 667         Buffer m;
 668         char *p, *msg;
 669         int success = 0, tmp1 = -1, tmp2 = -1;
 670
 671         /* Kludge: ensure there are fds free to receive the pty/tty */
 672         if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
 673             (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
 674                 error("%s: cannot allocate fds for pty", __func__);
 675                 if (tmp1 > 0)
 676                         close(tmp1);
 677                 if (tmp2 > 0)
 678                         close(tmp2);
 679                 return 0;
 680         }
 681         close(tmp1);
 682         close(tmp2);
 683
 684         buffer_init(&m);
 685         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 686
 687         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 688         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 689
 690         success = buffer_get_int(&m);
 691         if (success == 0) {
 692                 debug3("%s: pty alloc failed", __func__);
 693                 buffer_free(&m);
 694                 return (0);
 695         }
 696         p = buffer_get_string(&m, NULL);
 697         msg = buffer_get_string(&m, NULL);
 698         buffer_free(&m);
 699
 700         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 701         xfree(p);
 702
 703         buffer_append(&loginmsg, msg, strlen(msg));
 704         xfree(msg);
 705
 706         if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
 707             (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
 708                 fatal("%s: receive fds failed", __func__);
 709
 710         /* Success */
 711         return (1);
 712 }
 713
 714 void
 715 mm_session_pty_cleanup2(Session *s)
 716 {
 717         Buffer m;
 718
 719         if (s->ttyfd == -1)
 720                 return;
 721         buffer_init(&m);
 722         buffer_put_cstring(&m, s->tty);
 723         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 724         buffer_free(&m);
 725
 726         /* closed dup'ed master */
 727         if (s->ptymaster != -1 && close(s->ptymaster) < 0)
 728                 error("close(s->ptymaster/%d): %s",
 729                     s->ptymaster, strerror(errno));
 730
 731         /* unlink pty from session */
 732         s->ttyfd = -1;
 733 }
 734
 735 #ifdef USE_PAM
 736 void
 737 mm_start_pam(Authctxt *authctxt)
 738 {
 739         Buffer m;
 740
 741         debug3("%s entering", __func__);
 742         if (!options.use_pam)
 743                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 744
 745         buffer_init(&m);
 746         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 747
 748         buffer_free(&m);
 749 }
 750
 751 u_int
 752 mm_do_pam_account(void)
 753 {
 754         Buffer m;
 755         u_int ret;
 756         char *msg;
 757
 758         debug3("%s entering", __func__);
 759         if (!options.use_pam)
 760                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 761
 762         buffer_init(&m);
 763         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 764
 765         mm_request_receive_expect(pmonitor->m_recvfd,
 766             MONITOR_ANS_PAM_ACCOUNT, &m);
 767         ret = buffer_get_int(&m);
 768         msg = buffer_get_string(&m, NULL);
 769         buffer_append(&loginmsg, msg, strlen(msg));
 770         xfree(msg);
 771
 772         buffer_free(&m);
 773
 774         debug3("%s returning %d", __func__, ret);
 775
 776         return (ret);
 777 }
 778
 779 void *
 780 mm_sshpam_init_ctx(Authctxt *authctxt)
 781 {
 782         Buffer m;
 783         int success;
 784
 785         debug3("%s", __func__);
 786         buffer_init(&m);
 787         buffer_put_cstring(&m, authctxt->user);
 788         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 789         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 790         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 791         success = buffer_get_int(&m);
 792         if (success == 0) {
 793                 debug3("%s: pam_init_ctx failed", __func__);
 794                 buffer_free(&m);
 795                 return (NULL);
 796         }
 797         buffer_free(&m);
 798         return (authctxt);
 799 }
 800
 801 int
 802 mm_sshpam_query(void *ctx, char **name, char **info,
 803     u_int *num, char ***prompts, u_int **echo_on)
 804 {
 805         Buffer m;
 806         u_int i;
 807         int ret;
 808
 809         debug3("%s", __func__);
 810         buffer_init(&m);
 811         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 812         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 813         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 814         ret = buffer_get_int(&m);
 815         debug3("%s: pam_query returned %d", __func__, ret);
 816         *name = buffer_get_string(&m, NULL);
 817         *info = buffer_get_string(&m, NULL);
 818         *num = buffer_get_int(&m);
 819         if (*num > PAM_MAX_NUM_MSG)
 820                 fatal("%s: recieved %u PAM messages, expected <= %u",
 821                     __func__, *num, PAM_MAX_NUM_MSG);
 822         *prompts = xcalloc((*num + 1), sizeof(char *));
 823         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 824         for (i = 0; i < *num; ++i) {
 825                 (*prompts)[i] = buffer_get_string(&m, NULL);
 826                 (*echo_on)[i] = buffer_get_int(&m);
 827         }
 828         buffer_free(&m);
 829         return (ret);
 830 }
 831
 832 int
 833 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 834 {
 835         Buffer m;
 836         u_int i;
 837         int ret;
 838
 839         debug3("%s", __func__);
 840         buffer_init(&m);
 841         buffer_put_int(&m, num);
 842         for (i = 0; i < num; ++i)
 843                 buffer_put_cstring(&m, resp[i]);
 844         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 845         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 846         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 847         ret = buffer_get_int(&m);
 848         debug3("%s: pam_respond returned %d", __func__, ret);
 849         buffer_free(&m);
 850         return (ret);
 851 }
 852
 853 void
 854 mm_sshpam_free_ctx(void *ctxtp)
 855 {
 856         Buffer m;
 857
 858         debug3("%s", __func__);
 859         buffer_init(&m);
 860         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 861         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 862         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 863         buffer_free(&m);
 864 }
 865 #endif /* USE_PAM */
 866
 867 /* Request process termination */
 868
 869 void
 870 mm_terminate(void)
 871 {
 872         Buffer m;
 873
 874         buffer_init(&m);
 875         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 876         buffer_free(&m);
 877 }
 878
 879 int
 880 mm_ssh1_session_key(BIGNUM *num)
 881 {
 882         int rsafail;
 883         Buffer m;
 884
 885         buffer_init(&m);
 886         buffer_put_bignum2(&m, num);
 887         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 888
 889         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 890
 891         rsafail = buffer_get_int(&m);
 892         buffer_get_bignum2(&m, num);
 893
 894         buffer_free(&m);
 895
 896         return (rsafail);
 897 }
 898
 899 static void
 900 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 901     char ***prompts, u_int **echo_on)
 902 {
 903         *name = xstrdup("");
 904         *infotxt = xstrdup("");
 905         *numprompts = 1;
 906         *prompts = xcalloc(*numprompts, sizeof(char *));
 907         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 908         (*echo_on)[0] = 0;
 909 }
 910
 911 int
 912 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 913    u_int *numprompts, char ***prompts, u_int **echo_on)
 914 {
 915         Buffer m;
 916         u_int success;
 917         char *challenge;
 918
 919         debug3("%s: entering", __func__);
 920
 921         buffer_init(&m);
 922         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 923
 924         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 925             &m);
 926         success = buffer_get_int(&m);
 927         if (success == 0) {
 928                 debug3("%s: no challenge", __func__);
 929                 buffer_free(&m);
 930                 return (-1);
 931         }
 932
 933         /* Get the challenge, and format the response */
 934         challenge  = buffer_get_string(&m, NULL);
 935         buffer_free(&m);
 936
 937         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 938         (*prompts)[0] = challenge;
 939
 940         debug3("%s: received challenge: %s", __func__, challenge);
 941
 942         return (0);
 943 }
 944
 945 int
 946 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 947 {
 948         Buffer m;
 949         int authok;
 950
 951         debug3("%s: entering", __func__);
 952         if (numresponses != 1)
 953                 return (-1);
 954
 955         buffer_init(&m);
 956         buffer_put_cstring(&m, responses[0]);
 957         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 958
 959         mm_request_receive_expect(pmonitor->m_recvfd,
 960             MONITOR_ANS_BSDAUTHRESPOND, &m);
 961
 962         authok = buffer_get_int(&m);
 963         buffer_free(&m);
 964
 965         return ((authok == 0) ? -1 : 0);
 966 }
 967
 968 #ifdef SKEY
 969 int
 970 mm_skey_query(void *ctx, char **name, char **infotxt,
 971    u_int *numprompts, char ***prompts, u_int **echo_on)
 972 {
 973         Buffer m;
 974         u_int success;
 975         char *challenge;
 976
 977         debug3("%s: entering", __func__);
 978
 979         buffer_init(&m);
 980         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 981
 982         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 983             &m);
 984         success = buffer_get_int(&m);
 985         if (success == 0) {
 986                 debug3("%s: no challenge", __func__);
 987                 buffer_free(&m);
 988                 return (-1);
 989         }
 990
 991         /* Get the challenge, and format the response */
 992         challenge  = buffer_get_string(&m, NULL);
 993         buffer_free(&m);
 994
 995         debug3("%s: received challenge: %s", __func__, challenge);
 996
 997         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 998
 999         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1000         xfree(challenge);
1001
1002         return (0);
1003 }
1004
1005 int
1006 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
1007 {
1008         Buffer m;
1009         int authok;
1010
1011         debug3("%s: entering", __func__);
1012         if (numresponses != 1)
1013                 return (-1);
1014
1015         buffer_init(&m);
1016         buffer_put_cstring(&m, responses[0]);
1017         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1018
1019         mm_request_receive_expect(pmonitor->m_recvfd,
1020             MONITOR_ANS_SKEYRESPOND, &m);
1021
1022         authok = buffer_get_int(&m);
1023         buffer_free(&m);
1024
1025         return ((authok == 0) ? -1 : 0);
1026 }
1027 #endif /* SKEY */
1028
1029 void
1030 mm_ssh1_session_id(u_char session_id[16])
1031 {
1032         Buffer m;
1033         int i;
1034
1035         debug3("%s entering", __func__);
1036
1037         buffer_init(&m);
1038         for (i = 0; i < 16; i++)
1039                 buffer_put_char(&m, session_id[i]);
1040
1041         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1042         buffer_free(&m);
1043 }
1044
1045 int
1046 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1047 {
1048         Buffer m;
1049         Key *key;
1050         u_char *blob;
1051         u_int blen;
1052         int allowed = 0, have_forced = 0;
1053
1054         debug3("%s entering", __func__);
1055
1056         buffer_init(&m);
1057         buffer_put_bignum2(&m, client_n);
1058
1059         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1060         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1061
1062         allowed = buffer_get_int(&m);
1063
1064         /* fake forced command */
1065         auth_clear_options();
1066         have_forced = buffer_get_int(&m);
1067         forced_command = have_forced ? xstrdup("true") : NULL;
1068
1069         if (allowed && rkey != NULL) {
1070                 blob = buffer_get_string(&m, &blen);
1071                 if ((key = key_from_blob(blob, blen)) == NULL)
1072                         fatal("%s: key_from_blob failed", __func__);
1073                 *rkey = key;
1074                 xfree(blob);
1075         }
1076         mm_send_debug(&m);
1077         buffer_free(&m);
1078
1079         return (allowed);
1080 }
1081
1082 BIGNUM *
1083 mm_auth_rsa_generate_challenge(Key *key)
1084 {
1085         Buffer m;
1086         BIGNUM *challenge;
1087         u_char *blob;
1088         u_int blen;
1089
1090         debug3("%s entering", __func__);
1091
1092         if ((challenge = BN_new()) == NULL)
1093                 fatal("%s: BN_new failed", __func__);
1094
1095         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1096         if (key_to_blob(key, &blob, &blen) == 0)
1097                 fatal("%s: key_to_blob failed", __func__);
1098         key->type = KEY_RSA1;
1099
1100         buffer_init(&m);
1101         buffer_put_string(&m, blob, blen);
1102         xfree(blob);
1103
1104         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1105         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1106
1107         buffer_get_bignum2(&m, challenge);
1108         buffer_free(&m);
1109
1110         return (challenge);
1111 }
1112
1113 int
1114 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1115 {
1116         Buffer m;
1117         u_char *blob;
1118         u_int blen;
1119         int success = 0;
1120
1121         debug3("%s entering", __func__);
1122
1123         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1124         if (key_to_blob(key, &blob, &blen) == 0)
1125                 fatal("%s: key_to_blob failed", __func__);
1126         key->type = KEY_RSA1;
1127
1128         buffer_init(&m);
1129         buffer_put_string(&m, blob, blen);
1130         buffer_put_string(&m, response, 16);
1131         xfree(blob);
1132
1133         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1134         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1135
1136         success = buffer_get_int(&m);
1137         buffer_free(&m);
1138
1139         return (success);
1140 }
1141
1142 #ifdef SSH_AUDIT_EVENTS
1143 void
1144 mm_audit_event(ssh_audit_event_t event)
1145 {
1146         Buffer m;
1147
1148         debug3("%s entering", __func__);
1149
1150         buffer_init(&m);
1151         buffer_put_int(&m, event);
1152
1153         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1154         buffer_free(&m);
1155 }
1156
1157 void
1158 mm_audit_run_command(const char *command)
1159 {
1160         Buffer m;
1161
1162         debug3("%s entering command %s", __func__, command);
1163
1164         buffer_init(&m);
1165         buffer_put_cstring(&m, command);
1166
1167         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1168         buffer_free(&m);
1169 }
1170 #endif /* SSH_AUDIT_EVENTS */
1171
1172 #ifdef GSSAPI
1173 OM_uint32
1174 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1175 {
1176         Buffer m;
1177         OM_uint32 major;
1178
1179         /* Client doesn't get to see the context */
1180         *ctx = NULL;
1181
1182         buffer_init(&m);
1183         buffer_put_string(&m, goid->elements, goid->length);
1184
1185         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1186         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1187
1188         major = buffer_get_int(&m);
1189
1190         buffer_free(&m);
1191         return (major);
1192 }
1193
1194 OM_uint32
1195 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1196     gss_buffer_desc *out, OM_uint32 *flags)
1197 {
1198         Buffer m;
1199         OM_uint32 major;
1200         u_int len;
1201
1202         buffer_init(&m);
1203         buffer_put_string(&m, in->value, in->length);
1204
1205         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1206         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1207
1208         major = buffer_get_int(&m);
1209         out->value = buffer_get_string(&m, &len);
1210         out->length = len;
1211         if (flags)
1212                 *flags = buffer_get_int(&m);
1213
1214         buffer_free(&m);
1215
1216         return (major);
1217 }
1218
1219 OM_uint32
1220 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1221 {
1222         Buffer m;
1223         OM_uint32 major;
1224
1225         buffer_init(&m);
1226         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1227         buffer_put_string(&m, gssmic->value, gssmic->length);
1228
1229         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1230         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1231             &m);
1232
1233         major = buffer_get_int(&m);
1234         buffer_free(&m);
1235         return(major);
1236 }
1237
1238 int
1239 mm_ssh_gssapi_userok(char *user)
1240 {
1241         Buffer m;
1242         int authenticated = 0;
1243
1244         buffer_init(&m);
1245
1246         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1247         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1248                                   &m);
1249
1250         authenticated = buffer_get_int(&m);
1251
1252         buffer_free(&m);
1253         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1254         return (authenticated);
1255 }
1256 #endif /* GSSAPI */