monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.54 2006/08/12 20:46:46 miod Exp $ */
   2 /*
   3  * Copyright 2002 Niels Provos <provos@citi.umich.edu>
   4  * Copyright 2002 Markus Friedl <markus@openbsd.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "includes.h"
  29
  30 #include <sys/types.h>
  31 #include <sys/uio.h>
  32
  33 #include <errno.h>
  34 #include <pwd.h>
  35 #include <signal.h>
  36 #include <stdarg.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 #include <openssl/bn.h>
  42 #include <openssl/dh.h>
  43
  44 #include "xmalloc.h"
  45 #include "ssh.h"
  46 #include "dh.h"
  47 #include "buffer.h"
  48 #include "key.h"
  49 #include "cipher.h"
  50 #include "kex.h"
  51 #include "hostfile.h"
  52 #include "auth.h"
  53 #include "auth-options.h"
  54 #include "packet.h"
  55 #include "mac.h"
  56 #include "log.h"
  57 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  58 #undef TARGET_OS_MAC
  59 #include "zlib.h"
  60 #define TARGET_OS_MAC 1
  61 #else
  62 #include "zlib.h"
  63 #endif
  64 #include "monitor.h"
  65 #ifdef GSSAPI
  66 #include "ssh-gss.h"
  67 #endif
  68 #include "monitor_wrap.h"
  69 #include "atomicio.h"
  70 #include "monitor_fdpass.h"
  71 #include "misc.h"
  72 #include "servconf.h"
  73
  74 #include "channels.h"
  75 #include "session.h"
  76
  77 /* Imports */
  78 extern int compat20;
  79 extern Newkeys *newkeys[];
  80 extern z_stream incoming_stream;
  81 extern z_stream outgoing_stream;
  82 extern struct monitor *pmonitor;
  83 extern Buffer input, output;
  84 extern Buffer loginmsg;
  85 extern ServerOptions options;
  86
  87 int
  88 mm_is_monitor(void)
  89 {
  90         /*
  91          * m_pid is only set in the privileged part, and
  92          * points to the unprivileged child.
  93          */
  94         return (pmonitor && pmonitor->m_pid > 0);
  95 }
  96
  97 void
  98 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
  99 {
 100         u_int mlen = buffer_len(m);
 101         u_char buf[5];
 102
 103         debug3("%s entering: type %d", __func__, type);
 104
 105         put_u32(buf, mlen + 1);
 106         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 107         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 108                 fatal("%s: write: %s", __func__, strerror(errno));
 109         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 110                 fatal("%s: write: %s", __func__, strerror(errno));
 111 }
 112
 113 void
 114 mm_request_receive(int sock, Buffer *m)
 115 {
 116         u_char buf[4];
 117         u_int msg_len;
 118
 119         debug3("%s entering", __func__);
 120
 121         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 122                 if (errno == EPIPE)
 123                         cleanup_exit(255);
 124                 fatal("%s: read: %s", __func__, strerror(errno));
 125         }
 126         msg_len = get_u32(buf);
 127         if (msg_len > 256 * 1024)
 128                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 129         buffer_clear(m);
 130         buffer_append_space(m, msg_len);
 131         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 132                 fatal("%s: read: %s", __func__, strerror(errno));
 133 }
 134
 135 void
 136 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 137 {
 138         u_char rtype;
 139
 140         debug3("%s entering: type %d", __func__, type);
 141
 142         mm_request_receive(sock, m);
 143         rtype = buffer_get_char(m);
 144         if (rtype != type)
 145                 fatal("%s: read: rtype %d != type %d", __func__,
 146                     rtype, type);
 147 }
 148
 149 DH *
 150 mm_choose_dh(int min, int nbits, int max)
 151 {
 152         BIGNUM *p, *g;
 153         int success = 0;
 154         Buffer m;
 155
 156         buffer_init(&m);
 157         buffer_put_int(&m, min);
 158         buffer_put_int(&m, nbits);
 159         buffer_put_int(&m, max);
 160
 161         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 162
 163         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 164         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 165
 166         success = buffer_get_char(&m);
 167         if (success == 0)
 168                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 169
 170         if ((p = BN_new()) == NULL)
 171                 fatal("%s: BN_new failed", __func__);
 172         if ((g = BN_new()) == NULL)
 173                 fatal("%s: BN_new failed", __func__);
 174         buffer_get_bignum2(&m, p);
 175         buffer_get_bignum2(&m, g);
 176
 177         debug3("%s: remaining %d", __func__, buffer_len(&m));
 178         buffer_free(&m);
 179
 180         return (dh_new_group(g, p));
 181 }
 182
 183 int
 184 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 185 {
 186         Kex *kex = *pmonitor->m_pkex;
 187         Buffer m;
 188
 189         debug3("%s entering", __func__);
 190
 191         buffer_init(&m);
 192         buffer_put_int(&m, kex->host_key_index(key));
 193         buffer_put_string(&m, data, datalen);
 194
 195         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 196
 197         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 198         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 199         *sigp  = buffer_get_string(&m, lenp);
 200         buffer_free(&m);
 201
 202         return (0);
 203 }
 204
 205 struct passwd *
 206 mm_getpwnamallow(const char *username)
 207 {
 208         Buffer m;
 209         struct passwd *pw;
 210         u_int pwlen;
 211
 212         debug3("%s entering", __func__);
 213
 214         buffer_init(&m);
 215         buffer_put_cstring(&m, username);
 216
 217         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 218
 219         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 220         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 221
 222         if (buffer_get_char(&m) == 0) {
 223                 buffer_free(&m);
 224                 return (NULL);
 225         }
 226         pw = buffer_get_string(&m, &pwlen);
 227         if (pwlen != sizeof(struct passwd))
 228                 fatal("%s: struct passwd size mismatch", __func__);
 229         pw->pw_name = buffer_get_string(&m, NULL);
 230         pw->pw_passwd = buffer_get_string(&m, NULL);
 231         pw->pw_gecos = buffer_get_string(&m, NULL);
 232 #ifdef HAVE_PW_CLASS_IN_PASSWD
 233         pw->pw_class = buffer_get_string(&m, NULL);
 234 #endif
 235         pw->pw_dir = buffer_get_string(&m, NULL);
 236         pw->pw_shell = buffer_get_string(&m, NULL);
 237         buffer_free(&m);
 238
 239         return (pw);
 240 }
 241
 242 char *
 243 mm_auth2_read_banner(void)
 244 {
 245         Buffer m;
 246         char *banner;
 247
 248         debug3("%s entering", __func__);
 249
 250         buffer_init(&m);
 251         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 252         buffer_clear(&m);
 253
 254         mm_request_receive_expect(pmonitor->m_recvfd,
 255             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 256         banner = buffer_get_string(&m, NULL);
 257         buffer_free(&m);
 258
 259         /* treat empty banner as missing banner */
 260         if (strlen(banner) == 0) {
 261                 xfree(banner);
 262                 banner = NULL;
 263         }
 264         return (banner);
 265 }
 266
 267 /* Inform the privileged process about service and style */
 268
 269 void
 270 mm_inform_authserv(char *service, char *style)
 271 {
 272         Buffer m;
 273
 274         debug3("%s entering", __func__);
 275
 276         buffer_init(&m);
 277         buffer_put_cstring(&m, service);
 278         buffer_put_cstring(&m, style ? style : "");
 279
 280         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 281
 282         buffer_free(&m);
 283 }
 284
 285 /* Do the password authentication */
 286 int
 287 mm_auth_password(Authctxt *authctxt, char *password)
 288 {
 289         Buffer m;
 290         int authenticated = 0;
 291
 292         debug3("%s entering", __func__);
 293
 294         buffer_init(&m);
 295         buffer_put_cstring(&m, password);
 296         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 297
 298         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 299         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 300
 301         authenticated = buffer_get_int(&m);
 302
 303         buffer_free(&m);
 304
 305         debug3("%s: user %sauthenticated",
 306             __func__, authenticated ? "" : "not ");
 307         return (authenticated);
 308 }
 309
 310 int
 311 mm_user_key_allowed(struct passwd *pw, Key *key)
 312 {
 313         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 314 }
 315
 316 int
 317 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 318     Key *key)
 319 {
 320         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 321 }
 322
 323 int
 324 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 325     char *host, Key *key)
 326 {
 327         int ret;
 328
 329         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 330         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 331         key->type = KEY_RSA1;
 332         return (ret);
 333 }
 334
 335 static void
 336 mm_send_debug(Buffer *m)
 337 {
 338         char *msg;
 339
 340         while (buffer_len(m)) {
 341                 msg = buffer_get_string(m, NULL);
 342                 debug3("%s: Sending debug: %s", __func__, msg);
 343                 packet_send_debug("%s", msg);
 344                 xfree(msg);
 345         }
 346 }
 347
 348 int
 349 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 350 {
 351         Buffer m;
 352         u_char *blob;
 353         u_int len;
 354         int allowed = 0, have_forced = 0;
 355
 356         debug3("%s entering", __func__);
 357
 358         /* Convert the key to a blob and the pass it over */
 359         if (!key_to_blob(key, &blob, &len))
 360                 return (0);
 361
 362         buffer_init(&m);
 363         buffer_put_int(&m, type);
 364         buffer_put_cstring(&m, user ? user : "");
 365         buffer_put_cstring(&m, host ? host : "");
 366         buffer_put_string(&m, blob, len);
 367         xfree(blob);
 368
 369         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 370
 371         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 372         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 373
 374         allowed = buffer_get_int(&m);
 375
 376         /* fake forced command */
 377         auth_clear_options();
 378         have_forced = buffer_get_int(&m);
 379         forced_command = have_forced ? xstrdup("true") : NULL;
 380
 381         /* Send potential debug messages */
 382         mm_send_debug(&m);
 383
 384         buffer_free(&m);
 385
 386         return (allowed);
 387 }
 388
 389 /*
 390  * This key verify needs to send the key type along, because the
 391  * privileged parent makes the decision if the key is allowed
 392  * for authentication.
 393  */
 394
 395 int
 396 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 397 {
 398         Buffer m;
 399         u_char *blob;
 400         u_int len;
 401         int verified = 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_string(&m, blob, len);
 411         buffer_put_string(&m, sig, siglen);
 412         buffer_put_string(&m, data, datalen);
 413         xfree(blob);
 414
 415         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 416
 417         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 418         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 419
 420         verified = buffer_get_int(&m);
 421
 422         buffer_free(&m);
 423
 424         return (verified);
 425 }
 426
 427 /* Export key state after authentication */
 428 Newkeys *
 429 mm_newkeys_from_blob(u_char *blob, int blen)
 430 {
 431         Buffer b;
 432         u_int len;
 433         Newkeys *newkey = NULL;
 434         Enc *enc;
 435         Mac *mac;
 436         Comp *comp;
 437
 438         debug3("%s: %p(%d)", __func__, blob, blen);
 439 #ifdef DEBUG_PK
 440         dump_base64(stderr, blob, blen);
 441 #endif
 442         buffer_init(&b);
 443         buffer_append(&b, blob, blen);
 444
 445         newkey = xmalloc(sizeof(*newkey));
 446         enc = &newkey->enc;
 447         mac = &newkey->mac;
 448         comp = &newkey->comp;
 449
 450         /* Enc structure */
 451         enc->name = buffer_get_string(&b, NULL);
 452         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 453         enc->enabled = buffer_get_int(&b);
 454         enc->block_size = buffer_get_int(&b);
 455         enc->key = buffer_get_string(&b, &enc->key_len);
 456         enc->iv = buffer_get_string(&b, &len);
 457         if (len != enc->block_size)
 458                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 459                     enc->block_size, len);
 460
 461         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 462                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 463                     enc->name, enc->cipher);
 464
 465         /* Mac structure */
 466         mac->name = buffer_get_string(&b, NULL);
 467         if (mac->name == NULL || mac_init(mac, mac->name) == -1)
 468                 fatal("%s: can not init mac %s", __func__, mac->name);
 469         mac->enabled = buffer_get_int(&b);
 470         mac->key = buffer_get_string(&b, &len);
 471         if (len > mac->key_len)
 472                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 473                     mac->key_len);
 474         mac->key_len = len;
 475
 476         /* Comp structure */
 477         comp->type = buffer_get_int(&b);
 478         comp->enabled = buffer_get_int(&b);
 479         comp->name = buffer_get_string(&b, NULL);
 480
 481         len = buffer_len(&b);
 482         if (len != 0)
 483                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 484         buffer_free(&b);
 485         return (newkey);
 486 }
 487
 488 int
 489 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 490 {
 491         Buffer b;
 492         int len;
 493         Enc *enc;
 494         Mac *mac;
 495         Comp *comp;
 496         Newkeys *newkey = newkeys[mode];
 497
 498         debug3("%s: converting %p", __func__, newkey);
 499
 500         if (newkey == NULL) {
 501                 error("%s: newkey == NULL", __func__);
 502                 return 0;
 503         }
 504         enc = &newkey->enc;
 505         mac = &newkey->mac;
 506         comp = &newkey->comp;
 507
 508         buffer_init(&b);
 509         /* Enc structure */
 510         buffer_put_cstring(&b, enc->name);
 511         /* The cipher struct is constant and shared, you export pointer */
 512         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 513         buffer_put_int(&b, enc->enabled);
 514         buffer_put_int(&b, enc->block_size);
 515         buffer_put_string(&b, enc->key, enc->key_len);
 516         packet_get_keyiv(mode, enc->iv, enc->block_size);
 517         buffer_put_string(&b, enc->iv, enc->block_size);
 518
 519         /* Mac structure */
 520         buffer_put_cstring(&b, mac->name);
 521         buffer_put_int(&b, mac->enabled);
 522         buffer_put_string(&b, mac->key, mac->key_len);
 523
 524         /* Comp structure */
 525         buffer_put_int(&b, comp->type);
 526         buffer_put_int(&b, comp->enabled);
 527         buffer_put_cstring(&b, comp->name);
 528
 529         len = buffer_len(&b);
 530         if (lenp != NULL)
 531                 *lenp = len;
 532         if (blobp != NULL) {
 533                 *blobp = xmalloc(len);
 534                 memcpy(*blobp, buffer_ptr(&b), len);
 535         }
 536         memset(buffer_ptr(&b), 0, len);
 537         buffer_free(&b);
 538         return len;
 539 }
 540
 541 static void
 542 mm_send_kex(Buffer *m, Kex *kex)
 543 {
 544         buffer_put_string(m, kex->session_id, kex->session_id_len);
 545         buffer_put_int(m, kex->we_need);
 546         buffer_put_int(m, kex->hostkey_type);
 547         buffer_put_int(m, kex->kex_type);
 548         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 549         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 550         buffer_put_int(m, kex->flags);
 551         buffer_put_cstring(m, kex->client_version_string);
 552         buffer_put_cstring(m, kex->server_version_string);
 553 }
 554
 555 void
 556 mm_send_keystate(struct monitor *monitor)
 557 {
 558         Buffer m;
 559         u_char *blob, *p;
 560         u_int bloblen, plen;
 561         u_int32_t seqnr, packets;
 562         u_int64_t blocks;
 563
 564         buffer_init(&m);
 565
 566         if (!compat20) {
 567                 u_char iv[24];
 568                 u_char *key;
 569                 u_int ivlen, keylen;
 570
 571                 buffer_put_int(&m, packet_get_protocol_flags());
 572
 573                 buffer_put_int(&m, packet_get_ssh1_cipher());
 574
 575                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 576                 keylen = packet_get_encryption_key(NULL);
 577                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 578                 keylen = packet_get_encryption_key(key);
 579                 buffer_put_string(&m, key, keylen);
 580                 memset(key, 0, keylen);
 581                 xfree(key);
 582
 583                 ivlen = packet_get_keyiv_len(MODE_OUT);
 584                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 585                 buffer_put_string(&m, iv, ivlen);
 586                 ivlen = packet_get_keyiv_len(MODE_OUT);
 587                 packet_get_keyiv(MODE_IN, iv, ivlen);
 588                 buffer_put_string(&m, iv, ivlen);
 589                 goto skip;
 590         } else {
 591                 /* Kex for rekeying */
 592                 mm_send_kex(&m, *monitor->m_pkex);
 593         }
 594
 595         debug3("%s: Sending new keys: %p %p",
 596             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 597
 598         /* Keys from Kex */
 599         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 600                 fatal("%s: conversion of newkeys failed", __func__);
 601
 602         buffer_put_string(&m, blob, bloblen);
 603         xfree(blob);
 604
 605         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 606                 fatal("%s: conversion of newkeys failed", __func__);
 607
 608         buffer_put_string(&m, blob, bloblen);
 609         xfree(blob);
 610
 611         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
 612         buffer_put_int(&m, seqnr);
 613         buffer_put_int64(&m, blocks);
 614         buffer_put_int(&m, packets);
 615         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 616         buffer_put_int(&m, seqnr);
 617         buffer_put_int64(&m, blocks);
 618         buffer_put_int(&m, packets);
 619
 620         debug3("%s: New keys have been sent", __func__);
 621  skip:
 622         /* More key context */
 623         plen = packet_get_keycontext(MODE_OUT, NULL);
 624         p = xmalloc(plen+1);
 625         packet_get_keycontext(MODE_OUT, p);
 626         buffer_put_string(&m, p, plen);
 627         xfree(p);
 628
 629         plen = packet_get_keycontext(MODE_IN, NULL);
 630         p = xmalloc(plen+1);
 631         packet_get_keycontext(MODE_IN, p);
 632         buffer_put_string(&m, p, plen);
 633         xfree(p);
 634
 635         /* Compression state */
 636         debug3("%s: Sending compression state", __func__);
 637         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 638         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 639
 640         /* Network I/O buffers */
 641         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 642         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 643
 644         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 645         debug3("%s: Finished sending state", __func__);
 646
 647         buffer_free(&m);
 648 }
 649
 650 int
 651 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 652 {
 653         Buffer m;
 654         char *p, *msg;
 655         int success = 0;
 656
 657         buffer_init(&m);
 658         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 659
 660         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 661         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 662
 663         success = buffer_get_int(&m);
 664         if (success == 0) {
 665                 debug3("%s: pty alloc failed", __func__);
 666                 buffer_free(&m);
 667                 return (0);
 668         }
 669         p = buffer_get_string(&m, NULL);
 670         msg = buffer_get_string(&m, NULL);
 671         buffer_free(&m);
 672
 673         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 674         xfree(p);
 675
 676         buffer_append(&loginmsg, msg, strlen(msg));
 677         xfree(msg);
 678
 679         *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
 680         *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
 681
 682         /* Success */
 683         return (1);
 684 }
 685
 686 void
 687 mm_session_pty_cleanup2(Session *s)
 688 {
 689         Buffer m;
 690
 691         if (s->ttyfd == -1)
 692                 return;
 693         buffer_init(&m);
 694         buffer_put_cstring(&m, s->tty);
 695         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 696         buffer_free(&m);
 697
 698         /* closed dup'ed master */
 699         if (close(s->ptymaster) < 0)
 700                 error("close(s->ptymaster): %s", strerror(errno));
 701
 702         /* unlink pty from session */
 703         s->ttyfd = -1;
 704 }
 705
 706 #ifdef USE_PAM
 707 void
 708 mm_start_pam(Authctxt *authctxt)
 709 {
 710         Buffer m;
 711
 712         debug3("%s entering", __func__);
 713         if (!options.use_pam)
 714                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 715
 716         buffer_init(&m);
 717         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 718
 719         buffer_free(&m);
 720 }
 721
 722 u_int
 723 mm_do_pam_account(void)
 724 {
 725         Buffer m;
 726         u_int ret;
 727         char *msg;
 728
 729         debug3("%s entering", __func__);
 730         if (!options.use_pam)
 731                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 732
 733         buffer_init(&m);
 734         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 735
 736         mm_request_receive_expect(pmonitor->m_recvfd,
 737             MONITOR_ANS_PAM_ACCOUNT, &m);
 738         ret = buffer_get_int(&m);
 739         msg = buffer_get_string(&m, NULL);
 740         buffer_append(&loginmsg, msg, strlen(msg));
 741         xfree(msg);
 742
 743         buffer_free(&m);
 744
 745         debug3("%s returning %d", __func__, ret);
 746
 747         return (ret);
 748 }
 749
 750 void *
 751 mm_sshpam_init_ctx(Authctxt *authctxt)
 752 {
 753         Buffer m;
 754         int success;
 755
 756         debug3("%s", __func__);
 757         buffer_init(&m);
 758         buffer_put_cstring(&m, authctxt->user);
 759         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 760         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 761         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 762         success = buffer_get_int(&m);
 763         if (success == 0) {
 764                 debug3("%s: pam_init_ctx failed", __func__);
 765                 buffer_free(&m);
 766                 return (NULL);
 767         }
 768         buffer_free(&m);
 769         return (authctxt);
 770 }
 771
 772 int
 773 mm_sshpam_query(void *ctx, char **name, char **info,
 774     u_int *num, char ***prompts, u_int **echo_on)
 775 {
 776         Buffer m;
 777         u_int i;
 778         int ret;
 779
 780         debug3("%s", __func__);
 781         buffer_init(&m);
 782         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 783         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 784         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 785         ret = buffer_get_int(&m);
 786         debug3("%s: pam_query returned %d", __func__, ret);
 787         *name = buffer_get_string(&m, NULL);
 788         *info = buffer_get_string(&m, NULL);
 789         *num = buffer_get_int(&m);
 790         if (*num > PAM_MAX_NUM_MSG)
 791                 fatal("%s: recieved %u PAM messages, expected <= %u",
 792                     __func__, *num, PAM_MAX_NUM_MSG);
 793         *prompts = xcalloc((*num + 1), sizeof(char *));
 794         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 795         for (i = 0; i < *num; ++i) {
 796                 (*prompts)[i] = buffer_get_string(&m, NULL);
 797                 (*echo_on)[i] = buffer_get_int(&m);
 798         }
 799         buffer_free(&m);
 800         return (ret);
 801 }
 802
 803 int
 804 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 805 {
 806         Buffer m;
 807         u_int i;
 808         int ret;
 809
 810         debug3("%s", __func__);
 811         buffer_init(&m);
 812         buffer_put_int(&m, num);
 813         for (i = 0; i < num; ++i)
 814                 buffer_put_cstring(&m, resp[i]);
 815         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 816         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 817         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 818         ret = buffer_get_int(&m);
 819         debug3("%s: pam_respond returned %d", __func__, ret);
 820         buffer_free(&m);
 821         return (ret);
 822 }
 823
 824 void
 825 mm_sshpam_free_ctx(void *ctxtp)
 826 {
 827         Buffer m;
 828
 829         debug3("%s", __func__);
 830         buffer_init(&m);
 831         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 832         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 833         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 834         buffer_free(&m);
 835 }
 836 #endif /* USE_PAM */
 837
 838 /* Request process termination */
 839
 840 void
 841 mm_terminate(void)
 842 {
 843         Buffer m;
 844
 845         buffer_init(&m);
 846         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 847         buffer_free(&m);
 848 }
 849
 850 int
 851 mm_ssh1_session_key(BIGNUM *num)
 852 {
 853         int rsafail;
 854         Buffer m;
 855
 856         buffer_init(&m);
 857         buffer_put_bignum2(&m, num);
 858         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 859
 860         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 861
 862         rsafail = buffer_get_int(&m);
 863         buffer_get_bignum2(&m, num);
 864
 865         buffer_free(&m);
 866
 867         return (rsafail);
 868 }
 869
 870 static void
 871 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 872     char ***prompts, u_int **echo_on)
 873 {
 874         *name = xstrdup("");
 875         *infotxt = xstrdup("");
 876         *numprompts = 1;
 877         *prompts = xcalloc(*numprompts, sizeof(char *));
 878         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 879         (*echo_on)[0] = 0;
 880 }
 881
 882 int
 883 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 884    u_int *numprompts, char ***prompts, u_int **echo_on)
 885 {
 886         Buffer m;
 887         u_int success;
 888         char *challenge;
 889
 890         debug3("%s: entering", __func__);
 891
 892         buffer_init(&m);
 893         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 894
 895         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 896             &m);
 897         success = buffer_get_int(&m);
 898         if (success == 0) {
 899                 debug3("%s: no challenge", __func__);
 900                 buffer_free(&m);
 901                 return (-1);
 902         }
 903
 904         /* Get the challenge, and format the response */
 905         challenge  = buffer_get_string(&m, NULL);
 906         buffer_free(&m);
 907
 908         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 909         (*prompts)[0] = challenge;
 910
 911         debug3("%s: received challenge: %s", __func__, challenge);
 912
 913         return (0);
 914 }
 915
 916 int
 917 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 918 {
 919         Buffer m;
 920         int authok;
 921
 922         debug3("%s: entering", __func__);
 923         if (numresponses != 1)
 924                 return (-1);
 925
 926         buffer_init(&m);
 927         buffer_put_cstring(&m, responses[0]);
 928         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 929
 930         mm_request_receive_expect(pmonitor->m_recvfd,
 931             MONITOR_ANS_BSDAUTHRESPOND, &m);
 932
 933         authok = buffer_get_int(&m);
 934         buffer_free(&m);
 935
 936         return ((authok == 0) ? -1 : 0);
 937 }
 938
 939 #ifdef SKEY
 940 int
 941 mm_skey_query(void *ctx, char **name, char **infotxt,
 942    u_int *numprompts, char ***prompts, u_int **echo_on)
 943 {
 944         Buffer m;
 945         u_int success;
 946         char *challenge;
 947
 948         debug3("%s: entering", __func__);
 949
 950         buffer_init(&m);
 951         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 952
 953         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 954             &m);
 955         success = buffer_get_int(&m);
 956         if (success == 0) {
 957                 debug3("%s: no challenge", __func__);
 958                 buffer_free(&m);
 959                 return (-1);
 960         }
 961
 962         /* Get the challenge, and format the response */
 963         challenge  = buffer_get_string(&m, NULL);
 964         buffer_free(&m);
 965
 966         debug3("%s: received challenge: %s", __func__, challenge);
 967
 968         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 969
 970         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
 971         xfree(challenge);
 972
 973         return (0);
 974 }
 975
 976 int
 977 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 978 {
 979         Buffer m;
 980         int authok;
 981
 982         debug3("%s: entering", __func__);
 983         if (numresponses != 1)
 984                 return (-1);
 985
 986         buffer_init(&m);
 987         buffer_put_cstring(&m, responses[0]);
 988         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
 989
 990         mm_request_receive_expect(pmonitor->m_recvfd,
 991             MONITOR_ANS_SKEYRESPOND, &m);
 992
 993         authok = buffer_get_int(&m);
 994         buffer_free(&m);
 995
 996         return ((authok == 0) ? -1 : 0);
 997 }
 998 #endif /* SKEY */
 999
1000 void
1001 mm_ssh1_session_id(u_char session_id[16])
1002 {
1003         Buffer m;
1004         int i;
1005
1006         debug3("%s entering", __func__);
1007
1008         buffer_init(&m);
1009         for (i = 0; i < 16; i++)
1010                 buffer_put_char(&m, session_id[i]);
1011
1012         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1013         buffer_free(&m);
1014 }
1015
1016 int
1017 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1018 {
1019         Buffer m;
1020         Key *key;
1021         u_char *blob;
1022         u_int blen;
1023         int allowed = 0, have_forced = 0;
1024
1025         debug3("%s entering", __func__);
1026
1027         buffer_init(&m);
1028         buffer_put_bignum2(&m, client_n);
1029
1030         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1031         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1032
1033         allowed = buffer_get_int(&m);
1034
1035         /* fake forced command */
1036         auth_clear_options();
1037         have_forced = buffer_get_int(&m);
1038         forced_command = have_forced ? xstrdup("true") : NULL;
1039
1040         if (allowed && rkey != NULL) {
1041                 blob = buffer_get_string(&m, &blen);
1042                 if ((key = key_from_blob(blob, blen)) == NULL)
1043                         fatal("%s: key_from_blob failed", __func__);
1044                 *rkey = key;
1045                 xfree(blob);
1046         }
1047         mm_send_debug(&m);
1048         buffer_free(&m);
1049
1050         return (allowed);
1051 }
1052
1053 BIGNUM *
1054 mm_auth_rsa_generate_challenge(Key *key)
1055 {
1056         Buffer m;
1057         BIGNUM *challenge;
1058         u_char *blob;
1059         u_int blen;
1060
1061         debug3("%s entering", __func__);
1062
1063         if ((challenge = BN_new()) == NULL)
1064                 fatal("%s: BN_new failed", __func__);
1065
1066         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1067         if (key_to_blob(key, &blob, &blen) == 0)
1068                 fatal("%s: key_to_blob failed", __func__);
1069         key->type = KEY_RSA1;
1070
1071         buffer_init(&m);
1072         buffer_put_string(&m, blob, blen);
1073         xfree(blob);
1074
1075         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1076         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1077
1078         buffer_get_bignum2(&m, challenge);
1079         buffer_free(&m);
1080
1081         return (challenge);
1082 }
1083
1084 int
1085 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1086 {
1087         Buffer m;
1088         u_char *blob;
1089         u_int blen;
1090         int success = 0;
1091
1092         debug3("%s entering", __func__);
1093
1094         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1095         if (key_to_blob(key, &blob, &blen) == 0)
1096                 fatal("%s: key_to_blob failed", __func__);
1097         key->type = KEY_RSA1;
1098
1099         buffer_init(&m);
1100         buffer_put_string(&m, blob, blen);
1101         buffer_put_string(&m, response, 16);
1102         xfree(blob);
1103
1104         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1105         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1106
1107         success = buffer_get_int(&m);
1108         buffer_free(&m);
1109
1110         return (success);
1111 }
1112
1113 #ifdef SSH_AUDIT_EVENTS
1114 void
1115 mm_audit_event(ssh_audit_event_t event)
1116 {
1117         Buffer m;
1118
1119         debug3("%s entering", __func__);
1120
1121         buffer_init(&m);
1122         buffer_put_int(&m, event);
1123
1124         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1125         buffer_free(&m);
1126 }
1127
1128 void
1129 mm_audit_run_command(const char *command)
1130 {
1131         Buffer m;
1132
1133         debug3("%s entering command %s", __func__, command);
1134
1135         buffer_init(&m);
1136         buffer_put_cstring(&m, command);
1137
1138         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1139         buffer_free(&m);
1140 }
1141 #endif /* SSH_AUDIT_EVENTS */
1142
1143 #ifdef GSSAPI
1144 OM_uint32
1145 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1146 {
1147         Buffer m;
1148         OM_uint32 major;
1149
1150         /* Client doesn't get to see the context */
1151         *ctx = NULL;
1152
1153         buffer_init(&m);
1154         buffer_put_string(&m, goid->elements, goid->length);
1155
1156         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1157         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1158
1159         major = buffer_get_int(&m);
1160
1161         buffer_free(&m);
1162         return (major);
1163 }
1164
1165 OM_uint32
1166 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1167     gss_buffer_desc *out, OM_uint32 *flags)
1168 {
1169         Buffer m;
1170         OM_uint32 major;
1171         u_int len;
1172
1173         buffer_init(&m);
1174         buffer_put_string(&m, in->value, in->length);
1175
1176         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1177         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1178
1179         major = buffer_get_int(&m);
1180         out->value = buffer_get_string(&m, &len);
1181         out->length = len;
1182         if (flags)
1183                 *flags = buffer_get_int(&m);
1184
1185         buffer_free(&m);
1186
1187         return (major);
1188 }
1189
1190 OM_uint32
1191 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1192 {
1193         Buffer m;
1194         OM_uint32 major;
1195
1196         buffer_init(&m);
1197         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1198         buffer_put_string(&m, gssmic->value, gssmic->length);
1199
1200         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1201         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1202             &m);
1203
1204         major = buffer_get_int(&m);
1205         buffer_free(&m);
1206         return(major);
1207 }
1208
1209 int
1210 mm_ssh_gssapi_userok(char *user)
1211 {
1212         Buffer m;
1213         int authenticated = 0;
1214
1215         buffer_init(&m);
1216
1217         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1218         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1219                                   &m);
1220
1221         authenticated = buffer_get_int(&m);
1222
1223         buffer_free(&m);
1224         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1225         return (authenticated);
1226 }
1227 #endif /* GSSAPI */