monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.55 2007/02/19 10:45:58 dtucker Exp $ */
   2 /*
   3  * Copyright 2002 Niels Provos <provos@citi.umich.edu>
   4  * Copyright 2002 Markus Friedl <markus@openbsd.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "includes.h"
  29
  30 #include <sys/types.h>
  31 #include <sys/uio.h>
  32
  33 #include <errno.h>
  34 #include <pwd.h>
  35 #include <signal.h>
  36 #include <stdarg.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 #include <openssl/bn.h>
  42 #include <openssl/dh.h>
  43
  44 #include "xmalloc.h"
  45 #include "ssh.h"
  46 #include "dh.h"
  47 #include "buffer.h"
  48 #include "key.h"
  49 #include "cipher.h"
  50 #include "kex.h"
  51 #include "hostfile.h"
  52 #include "auth.h"
  53 #include "auth-options.h"
  54 #include "packet.h"
  55 #include "mac.h"
  56 #include "log.h"
  57 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  58 #undef TARGET_OS_MAC
  59 #include "zlib.h"
  60 #define TARGET_OS_MAC 1
  61 #else
  62 #include "zlib.h"
  63 #endif
  64 #include "monitor.h"
  65 #ifdef GSSAPI
  66 #include "ssh-gss.h"
  67 #endif
  68 #include "monitor_wrap.h"
  69 #include "atomicio.h"
  70 #include "monitor_fdpass.h"
  71 #include "misc.h"
  72 #include "servconf.h"
  73
  74 #include "channels.h"
  75 #include "session.h"
  76 #include "servconf.h"
  77
  78 /* Imports */
  79 extern int compat20;
  80 extern Newkeys *newkeys[];
  81 extern z_stream incoming_stream;
  82 extern z_stream outgoing_stream;
  83 extern struct monitor *pmonitor;
  84 extern Buffer input, output;
  85 extern Buffer loginmsg;
  86 extern ServerOptions options;
  87
  88 int
  89 mm_is_monitor(void)
  90 {
  91         /*
  92          * m_pid is only set in the privileged part, and
  93          * points to the unprivileged child.
  94          */
  95         return (pmonitor && pmonitor->m_pid > 0);
  96 }
  97
  98 void
  99 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
 100 {
 101         u_int mlen = buffer_len(m);
 102         u_char buf[5];
 103
 104         debug3("%s entering: type %d", __func__, type);
 105
 106         put_u32(buf, mlen + 1);
 107         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 108         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 109                 fatal("%s: write: %s", __func__, strerror(errno));
 110         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 111                 fatal("%s: write: %s", __func__, strerror(errno));
 112 }
 113
 114 void
 115 mm_request_receive(int sock, Buffer *m)
 116 {
 117         u_char buf[4];
 118         u_int msg_len;
 119
 120         debug3("%s entering", __func__);
 121
 122         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 123                 if (errno == EPIPE)
 124                         cleanup_exit(255);
 125                 fatal("%s: read: %s", __func__, strerror(errno));
 126         }
 127         msg_len = get_u32(buf);
 128         if (msg_len > 256 * 1024)
 129                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 130         buffer_clear(m);
 131         buffer_append_space(m, msg_len);
 132         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 133                 fatal("%s: read: %s", __func__, strerror(errno));
 134 }
 135
 136 void
 137 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 138 {
 139         u_char rtype;
 140
 141         debug3("%s entering: type %d", __func__, type);
 142
 143         mm_request_receive(sock, m);
 144         rtype = buffer_get_char(m);
 145         if (rtype != type)
 146                 fatal("%s: read: rtype %d != type %d", __func__,
 147                     rtype, type);
 148 }
 149
 150 DH *
 151 mm_choose_dh(int min, int nbits, int max)
 152 {
 153         BIGNUM *p, *g;
 154         int success = 0;
 155         Buffer m;
 156
 157         buffer_init(&m);
 158         buffer_put_int(&m, min);
 159         buffer_put_int(&m, nbits);
 160         buffer_put_int(&m, max);
 161
 162         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 163
 164         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 165         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 166
 167         success = buffer_get_char(&m);
 168         if (success == 0)
 169                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 170
 171         if ((p = BN_new()) == NULL)
 172                 fatal("%s: BN_new failed", __func__);
 173         if ((g = BN_new()) == NULL)
 174                 fatal("%s: BN_new failed", __func__);
 175         buffer_get_bignum2(&m, p);
 176         buffer_get_bignum2(&m, g);
 177
 178         debug3("%s: remaining %d", __func__, buffer_len(&m));
 179         buffer_free(&m);
 180
 181         return (dh_new_group(g, p));
 182 }
 183
 184 int
 185 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 186 {
 187         Kex *kex = *pmonitor->m_pkex;
 188         Buffer m;
 189
 190         debug3("%s entering", __func__);
 191
 192         buffer_init(&m);
 193         buffer_put_int(&m, kex->host_key_index(key));
 194         buffer_put_string(&m, data, datalen);
 195
 196         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 197
 198         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 199         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 200         *sigp  = buffer_get_string(&m, lenp);
 201         buffer_free(&m);
 202
 203         return (0);
 204 }
 205
 206 struct passwd *
 207 mm_getpwnamallow(const char *username)
 208 {
 209         Buffer m;
 210         struct passwd *pw;
 211         u_int len;
 212         ServerOptions *newopts;
 213
 214         debug3("%s entering", __func__);
 215
 216         buffer_init(&m);
 217         buffer_put_cstring(&m, username);
 218
 219         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 220
 221         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 222         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 223
 224         if (buffer_get_char(&m) == 0) {
 225                 buffer_free(&m);
 226                 return (NULL);
 227         }
 228         pw = buffer_get_string(&m, &len);
 229         if (len != sizeof(struct passwd))
 230                 fatal("%s: struct passwd size mismatch", __func__);
 231         pw->pw_name = buffer_get_string(&m, NULL);
 232         pw->pw_passwd = buffer_get_string(&m, NULL);
 233         pw->pw_gecos = buffer_get_string(&m, NULL);
 234 #ifdef HAVE_PW_CLASS_IN_PASSWD
 235         pw->pw_class = buffer_get_string(&m, NULL);
 236 #endif
 237         pw->pw_dir = buffer_get_string(&m, NULL);
 238         pw->pw_shell = buffer_get_string(&m, NULL);
 239
 240         /* copy options block as a Match directive may have changed some */
 241         newopts = buffer_get_string(&m, &len);
 242         if (len != sizeof(*newopts))
 243                 fatal("%s: option block size mismatch", __func__);
 244         if (newopts->banner != NULL)
 245                 newopts->banner = buffer_get_string(&m, NULL);
 246         copy_set_server_options(&options, newopts, 1);
 247         xfree(newopts);
 248
 249         buffer_free(&m);
 250
 251         return (pw);
 252 }
 253
 254 char *
 255 mm_auth2_read_banner(void)
 256 {
 257         Buffer m;
 258         char *banner;
 259
 260         debug3("%s entering", __func__);
 261
 262         buffer_init(&m);
 263         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 264         buffer_clear(&m);
 265
 266         mm_request_receive_expect(pmonitor->m_recvfd,
 267             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 268         banner = buffer_get_string(&m, NULL);
 269         buffer_free(&m);
 270
 271         /* treat empty banner as missing banner */
 272         if (strlen(banner) == 0) {
 273                 xfree(banner);
 274                 banner = NULL;
 275         }
 276         return (banner);
 277 }
 278
 279 /* Inform the privileged process about service and style */
 280
 281 void
 282 mm_inform_authserv(char *service, char *style)
 283 {
 284         Buffer m;
 285
 286         debug3("%s entering", __func__);
 287
 288         buffer_init(&m);
 289         buffer_put_cstring(&m, service);
 290         buffer_put_cstring(&m, style ? style : "");
 291
 292         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 293
 294         buffer_free(&m);
 295 }
 296
 297 /* Do the password authentication */
 298 int
 299 mm_auth_password(Authctxt *authctxt, char *password)
 300 {
 301         Buffer m;
 302         int authenticated = 0;
 303
 304         debug3("%s entering", __func__);
 305
 306         buffer_init(&m);
 307         buffer_put_cstring(&m, password);
 308         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 309
 310         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 311         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 312
 313         authenticated = buffer_get_int(&m);
 314
 315         buffer_free(&m);
 316
 317         debug3("%s: user %sauthenticated",
 318             __func__, authenticated ? "" : "not ");
 319         return (authenticated);
 320 }
 321
 322 int
 323 mm_user_key_allowed(struct passwd *pw, Key *key)
 324 {
 325         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 326 }
 327
 328 int
 329 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 330     Key *key)
 331 {
 332         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 333 }
 334
 335 int
 336 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 337     char *host, Key *key)
 338 {
 339         int ret;
 340
 341         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 342         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 343         key->type = KEY_RSA1;
 344         return (ret);
 345 }
 346
 347 static void
 348 mm_send_debug(Buffer *m)
 349 {
 350         char *msg;
 351
 352         while (buffer_len(m)) {
 353                 msg = buffer_get_string(m, NULL);
 354                 debug3("%s: Sending debug: %s", __func__, msg);
 355                 packet_send_debug("%s", msg);
 356                 xfree(msg);
 357         }
 358 }
 359
 360 int
 361 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 362 {
 363         Buffer m;
 364         u_char *blob;
 365         u_int len;
 366         int allowed = 0, have_forced = 0;
 367
 368         debug3("%s entering", __func__);
 369
 370         /* Convert the key to a blob and the pass it over */
 371         if (!key_to_blob(key, &blob, &len))
 372                 return (0);
 373
 374         buffer_init(&m);
 375         buffer_put_int(&m, type);
 376         buffer_put_cstring(&m, user ? user : "");
 377         buffer_put_cstring(&m, host ? host : "");
 378         buffer_put_string(&m, blob, len);
 379         xfree(blob);
 380
 381         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 382
 383         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 384         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 385
 386         allowed = buffer_get_int(&m);
 387
 388         /* fake forced command */
 389         auth_clear_options();
 390         have_forced = buffer_get_int(&m);
 391         forced_command = have_forced ? xstrdup("true") : NULL;
 392
 393         /* Send potential debug messages */
 394         mm_send_debug(&m);
 395
 396         buffer_free(&m);
 397
 398         return (allowed);
 399 }
 400
 401 /*
 402  * This key verify needs to send the key type along, because the
 403  * privileged parent makes the decision if the key is allowed
 404  * for authentication.
 405  */
 406
 407 int
 408 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 409 {
 410         Buffer m;
 411         u_char *blob;
 412         u_int len;
 413         int verified = 0;
 414
 415         debug3("%s entering", __func__);
 416
 417         /* Convert the key to a blob and the pass it over */
 418         if (!key_to_blob(key, &blob, &len))
 419                 return (0);
 420
 421         buffer_init(&m);
 422         buffer_put_string(&m, blob, len);
 423         buffer_put_string(&m, sig, siglen);
 424         buffer_put_string(&m, data, datalen);
 425         xfree(blob);
 426
 427         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 428
 429         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 430         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 431
 432         verified = buffer_get_int(&m);
 433
 434         buffer_free(&m);
 435
 436         return (verified);
 437 }
 438
 439 /* Export key state after authentication */
 440 Newkeys *
 441 mm_newkeys_from_blob(u_char *blob, int blen)
 442 {
 443         Buffer b;
 444         u_int len;
 445         Newkeys *newkey = NULL;
 446         Enc *enc;
 447         Mac *mac;
 448         Comp *comp;
 449
 450         debug3("%s: %p(%d)", __func__, blob, blen);
 451 #ifdef DEBUG_PK
 452         dump_base64(stderr, blob, blen);
 453 #endif
 454         buffer_init(&b);
 455         buffer_append(&b, blob, blen);
 456
 457         newkey = xmalloc(sizeof(*newkey));
 458         enc = &newkey->enc;
 459         mac = &newkey->mac;
 460         comp = &newkey->comp;
 461
 462         /* Enc structure */
 463         enc->name = buffer_get_string(&b, NULL);
 464         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 465         enc->enabled = buffer_get_int(&b);
 466         enc->block_size = buffer_get_int(&b);
 467         enc->key = buffer_get_string(&b, &enc->key_len);
 468         enc->iv = buffer_get_string(&b, &len);
 469         if (len != enc->block_size)
 470                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 471                     enc->block_size, len);
 472
 473         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 474                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 475                     enc->name, enc->cipher);
 476
 477         /* Mac structure */
 478         mac->name = buffer_get_string(&b, NULL);
 479         if (mac->name == NULL || mac_init(mac, mac->name) == -1)
 480                 fatal("%s: can not init mac %s", __func__, mac->name);
 481         mac->enabled = buffer_get_int(&b);
 482         mac->key = buffer_get_string(&b, &len);
 483         if (len > mac->key_len)
 484                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 485                     mac->key_len);
 486         mac->key_len = len;
 487
 488         /* Comp structure */
 489         comp->type = buffer_get_int(&b);
 490         comp->enabled = buffer_get_int(&b);
 491         comp->name = buffer_get_string(&b, NULL);
 492
 493         len = buffer_len(&b);
 494         if (len != 0)
 495                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 496         buffer_free(&b);
 497         return (newkey);
 498 }
 499
 500 int
 501 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 502 {
 503         Buffer b;
 504         int len;
 505         Enc *enc;
 506         Mac *mac;
 507         Comp *comp;
 508         Newkeys *newkey = newkeys[mode];
 509
 510         debug3("%s: converting %p", __func__, newkey);
 511
 512         if (newkey == NULL) {
 513                 error("%s: newkey == NULL", __func__);
 514                 return 0;
 515         }
 516         enc = &newkey->enc;
 517         mac = &newkey->mac;
 518         comp = &newkey->comp;
 519
 520         buffer_init(&b);
 521         /* Enc structure */
 522         buffer_put_cstring(&b, enc->name);
 523         /* The cipher struct is constant and shared, you export pointer */
 524         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 525         buffer_put_int(&b, enc->enabled);
 526         buffer_put_int(&b, enc->block_size);
 527         buffer_put_string(&b, enc->key, enc->key_len);
 528         packet_get_keyiv(mode, enc->iv, enc->block_size);
 529         buffer_put_string(&b, enc->iv, enc->block_size);
 530
 531         /* Mac structure */
 532         buffer_put_cstring(&b, mac->name);
 533         buffer_put_int(&b, mac->enabled);
 534         buffer_put_string(&b, mac->key, mac->key_len);
 535
 536         /* Comp structure */
 537         buffer_put_int(&b, comp->type);
 538         buffer_put_int(&b, comp->enabled);
 539         buffer_put_cstring(&b, comp->name);
 540
 541         len = buffer_len(&b);
 542         if (lenp != NULL)
 543                 *lenp = len;
 544         if (blobp != NULL) {
 545                 *blobp = xmalloc(len);
 546                 memcpy(*blobp, buffer_ptr(&b), len);
 547         }
 548         memset(buffer_ptr(&b), 0, len);
 549         buffer_free(&b);
 550         return len;
 551 }
 552
 553 static void
 554 mm_send_kex(Buffer *m, Kex *kex)
 555 {
 556         buffer_put_string(m, kex->session_id, kex->session_id_len);
 557         buffer_put_int(m, kex->we_need);
 558         buffer_put_int(m, kex->hostkey_type);
 559         buffer_put_int(m, kex->kex_type);
 560         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 561         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 562         buffer_put_int(m, kex->flags);
 563         buffer_put_cstring(m, kex->client_version_string);
 564         buffer_put_cstring(m, kex->server_version_string);
 565 }
 566
 567 void
 568 mm_send_keystate(struct monitor *monitor)
 569 {
 570         Buffer m;
 571         u_char *blob, *p;
 572         u_int bloblen, plen;
 573         u_int32_t seqnr, packets;
 574         u_int64_t blocks;
 575
 576         buffer_init(&m);
 577
 578         if (!compat20) {
 579                 u_char iv[24];
 580                 u_char *key;
 581                 u_int ivlen, keylen;
 582
 583                 buffer_put_int(&m, packet_get_protocol_flags());
 584
 585                 buffer_put_int(&m, packet_get_ssh1_cipher());
 586
 587                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 588                 keylen = packet_get_encryption_key(NULL);
 589                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 590                 keylen = packet_get_encryption_key(key);
 591                 buffer_put_string(&m, key, keylen);
 592                 memset(key, 0, keylen);
 593                 xfree(key);
 594
 595                 ivlen = packet_get_keyiv_len(MODE_OUT);
 596                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 597                 buffer_put_string(&m, iv, ivlen);
 598                 ivlen = packet_get_keyiv_len(MODE_OUT);
 599                 packet_get_keyiv(MODE_IN, iv, ivlen);
 600                 buffer_put_string(&m, iv, ivlen);
 601                 goto skip;
 602         } else {
 603                 /* Kex for rekeying */
 604                 mm_send_kex(&m, *monitor->m_pkex);
 605         }
 606
 607         debug3("%s: Sending new keys: %p %p",
 608             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 609
 610         /* Keys from Kex */
 611         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 612                 fatal("%s: conversion of newkeys failed", __func__);
 613
 614         buffer_put_string(&m, blob, bloblen);
 615         xfree(blob);
 616
 617         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 618                 fatal("%s: conversion of newkeys failed", __func__);
 619
 620         buffer_put_string(&m, blob, bloblen);
 621         xfree(blob);
 622
 623         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
 624         buffer_put_int(&m, seqnr);
 625         buffer_put_int64(&m, blocks);
 626         buffer_put_int(&m, packets);
 627         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 628         buffer_put_int(&m, seqnr);
 629         buffer_put_int64(&m, blocks);
 630         buffer_put_int(&m, packets);
 631
 632         debug3("%s: New keys have been sent", __func__);
 633  skip:
 634         /* More key context */
 635         plen = packet_get_keycontext(MODE_OUT, NULL);
 636         p = xmalloc(plen+1);
 637         packet_get_keycontext(MODE_OUT, p);
 638         buffer_put_string(&m, p, plen);
 639         xfree(p);
 640
 641         plen = packet_get_keycontext(MODE_IN, NULL);
 642         p = xmalloc(plen+1);
 643         packet_get_keycontext(MODE_IN, p);
 644         buffer_put_string(&m, p, plen);
 645         xfree(p);
 646
 647         /* Compression state */
 648         debug3("%s: Sending compression state", __func__);
 649         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 650         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 651
 652         /* Network I/O buffers */
 653         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 654         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 655
 656         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 657         debug3("%s: Finished sending state", __func__);
 658
 659         buffer_free(&m);
 660 }
 661
 662 int
 663 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 664 {
 665         Buffer m;
 666         char *p, *msg;
 667         int success = 0;
 668
 669         buffer_init(&m);
 670         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 671
 672         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 673         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 674
 675         success = buffer_get_int(&m);
 676         if (success == 0) {
 677                 debug3("%s: pty alloc failed", __func__);
 678                 buffer_free(&m);
 679                 return (0);
 680         }
 681         p = buffer_get_string(&m, NULL);
 682         msg = buffer_get_string(&m, NULL);
 683         buffer_free(&m);
 684
 685         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 686         xfree(p);
 687
 688         buffer_append(&loginmsg, msg, strlen(msg));
 689         xfree(msg);
 690
 691         *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
 692         *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
 693
 694         /* Success */
 695         return (1);
 696 }
 697
 698 void
 699 mm_session_pty_cleanup2(Session *s)
 700 {
 701         Buffer m;
 702
 703         if (s->ttyfd == -1)
 704                 return;
 705         buffer_init(&m);
 706         buffer_put_cstring(&m, s->tty);
 707         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 708         buffer_free(&m);
 709
 710         /* closed dup'ed master */
 711         if (close(s->ptymaster) < 0)
 712                 error("close(s->ptymaster): %s", strerror(errno));
 713
 714         /* unlink pty from session */
 715         s->ttyfd = -1;
 716 }
 717
 718 #ifdef USE_PAM
 719 void
 720 mm_start_pam(Authctxt *authctxt)
 721 {
 722         Buffer m;
 723
 724         debug3("%s entering", __func__);
 725         if (!options.use_pam)
 726                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 727
 728         buffer_init(&m);
 729         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 730
 731         buffer_free(&m);
 732 }
 733
 734 u_int
 735 mm_do_pam_account(void)
 736 {
 737         Buffer m;
 738         u_int ret;
 739         char *msg;
 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_ACCOUNT, &m);
 747
 748         mm_request_receive_expect(pmonitor->m_recvfd,
 749             MONITOR_ANS_PAM_ACCOUNT, &m);
 750         ret = buffer_get_int(&m);
 751         msg = buffer_get_string(&m, NULL);
 752         buffer_append(&loginmsg, msg, strlen(msg));
 753         xfree(msg);
 754
 755         buffer_free(&m);
 756
 757         debug3("%s returning %d", __func__, ret);
 758
 759         return (ret);
 760 }
 761
 762 void *
 763 mm_sshpam_init_ctx(Authctxt *authctxt)
 764 {
 765         Buffer m;
 766         int success;
 767
 768         debug3("%s", __func__);
 769         buffer_init(&m);
 770         buffer_put_cstring(&m, authctxt->user);
 771         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 772         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 773         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 774         success = buffer_get_int(&m);
 775         if (success == 0) {
 776                 debug3("%s: pam_init_ctx failed", __func__);
 777                 buffer_free(&m);
 778                 return (NULL);
 779         }
 780         buffer_free(&m);
 781         return (authctxt);
 782 }
 783
 784 int
 785 mm_sshpam_query(void *ctx, char **name, char **info,
 786     u_int *num, char ***prompts, u_int **echo_on)
 787 {
 788         Buffer m;
 789         u_int i;
 790         int ret;
 791
 792         debug3("%s", __func__);
 793         buffer_init(&m);
 794         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 795         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 796         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 797         ret = buffer_get_int(&m);
 798         debug3("%s: pam_query returned %d", __func__, ret);
 799         *name = buffer_get_string(&m, NULL);
 800         *info = buffer_get_string(&m, NULL);
 801         *num = buffer_get_int(&m);
 802         if (*num > PAM_MAX_NUM_MSG)
 803                 fatal("%s: recieved %u PAM messages, expected <= %u",
 804                     __func__, *num, PAM_MAX_NUM_MSG);
 805         *prompts = xcalloc((*num + 1), sizeof(char *));
 806         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 807         for (i = 0; i < *num; ++i) {
 808                 (*prompts)[i] = buffer_get_string(&m, NULL);
 809                 (*echo_on)[i] = buffer_get_int(&m);
 810         }
 811         buffer_free(&m);
 812         return (ret);
 813 }
 814
 815 int
 816 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 817 {
 818         Buffer m;
 819         u_int i;
 820         int ret;
 821
 822         debug3("%s", __func__);
 823         buffer_init(&m);
 824         buffer_put_int(&m, num);
 825         for (i = 0; i < num; ++i)
 826                 buffer_put_cstring(&m, resp[i]);
 827         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 828         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 829         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 830         ret = buffer_get_int(&m);
 831         debug3("%s: pam_respond returned %d", __func__, ret);
 832         buffer_free(&m);
 833         return (ret);
 834 }
 835
 836 void
 837 mm_sshpam_free_ctx(void *ctxtp)
 838 {
 839         Buffer m;
 840
 841         debug3("%s", __func__);
 842         buffer_init(&m);
 843         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 844         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 845         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 846         buffer_free(&m);
 847 }
 848 #endif /* USE_PAM */
 849
 850 /* Request process termination */
 851
 852 void
 853 mm_terminate(void)
 854 {
 855         Buffer m;
 856
 857         buffer_init(&m);
 858         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 859         buffer_free(&m);
 860 }
 861
 862 int
 863 mm_ssh1_session_key(BIGNUM *num)
 864 {
 865         int rsafail;
 866         Buffer m;
 867
 868         buffer_init(&m);
 869         buffer_put_bignum2(&m, num);
 870         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 871
 872         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 873
 874         rsafail = buffer_get_int(&m);
 875         buffer_get_bignum2(&m, num);
 876
 877         buffer_free(&m);
 878
 879         return (rsafail);
 880 }
 881
 882 static void
 883 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 884     char ***prompts, u_int **echo_on)
 885 {
 886         *name = xstrdup("");
 887         *infotxt = xstrdup("");
 888         *numprompts = 1;
 889         *prompts = xcalloc(*numprompts, sizeof(char *));
 890         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 891         (*echo_on)[0] = 0;
 892 }
 893
 894 int
 895 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 896    u_int *numprompts, char ***prompts, u_int **echo_on)
 897 {
 898         Buffer m;
 899         u_int success;
 900         char *challenge;
 901
 902         debug3("%s: entering", __func__);
 903
 904         buffer_init(&m);
 905         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 906
 907         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 908             &m);
 909         success = buffer_get_int(&m);
 910         if (success == 0) {
 911                 debug3("%s: no challenge", __func__);
 912                 buffer_free(&m);
 913                 return (-1);
 914         }
 915
 916         /* Get the challenge, and format the response */
 917         challenge  = buffer_get_string(&m, NULL);
 918         buffer_free(&m);
 919
 920         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 921         (*prompts)[0] = challenge;
 922
 923         debug3("%s: received challenge: %s", __func__, challenge);
 924
 925         return (0);
 926 }
 927
 928 int
 929 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 930 {
 931         Buffer m;
 932         int authok;
 933
 934         debug3("%s: entering", __func__);
 935         if (numresponses != 1)
 936                 return (-1);
 937
 938         buffer_init(&m);
 939         buffer_put_cstring(&m, responses[0]);
 940         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 941
 942         mm_request_receive_expect(pmonitor->m_recvfd,
 943             MONITOR_ANS_BSDAUTHRESPOND, &m);
 944
 945         authok = buffer_get_int(&m);
 946         buffer_free(&m);
 947
 948         return ((authok == 0) ? -1 : 0);
 949 }
 950
 951 #ifdef SKEY
 952 int
 953 mm_skey_query(void *ctx, char **name, char **infotxt,
 954    u_int *numprompts, char ***prompts, u_int **echo_on)
 955 {
 956         Buffer m;
 957         u_int success;
 958         char *challenge;
 959
 960         debug3("%s: entering", __func__);
 961
 962         buffer_init(&m);
 963         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 964
 965         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 966             &m);
 967         success = buffer_get_int(&m);
 968         if (success == 0) {
 969                 debug3("%s: no challenge", __func__);
 970                 buffer_free(&m);
 971                 return (-1);
 972         }
 973
 974         /* Get the challenge, and format the response */
 975         challenge  = buffer_get_string(&m, NULL);
 976         buffer_free(&m);
 977
 978         debug3("%s: received challenge: %s", __func__, challenge);
 979
 980         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 981
 982         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
 983         xfree(challenge);
 984
 985         return (0);
 986 }
 987
 988 int
 989 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 990 {
 991         Buffer m;
 992         int authok;
 993
 994         debug3("%s: entering", __func__);
 995         if (numresponses != 1)
 996                 return (-1);
 997
 998         buffer_init(&m);
 999         buffer_put_cstring(&m, responses[0]);
1000         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1001
1002         mm_request_receive_expect(pmonitor->m_recvfd,
1003             MONITOR_ANS_SKEYRESPOND, &m);
1004
1005         authok = buffer_get_int(&m);
1006         buffer_free(&m);
1007
1008         return ((authok == 0) ? -1 : 0);
1009 }
1010 #endif /* SKEY */
1011
1012 void
1013 mm_ssh1_session_id(u_char session_id[16])
1014 {
1015         Buffer m;
1016         int i;
1017
1018         debug3("%s entering", __func__);
1019
1020         buffer_init(&m);
1021         for (i = 0; i < 16; i++)
1022                 buffer_put_char(&m, session_id[i]);
1023
1024         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1025         buffer_free(&m);
1026 }
1027
1028 int
1029 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1030 {
1031         Buffer m;
1032         Key *key;
1033         u_char *blob;
1034         u_int blen;
1035         int allowed = 0, have_forced = 0;
1036
1037         debug3("%s entering", __func__);
1038
1039         buffer_init(&m);
1040         buffer_put_bignum2(&m, client_n);
1041
1042         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1043         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1044
1045         allowed = buffer_get_int(&m);
1046
1047         /* fake forced command */
1048         auth_clear_options();
1049         have_forced = buffer_get_int(&m);
1050         forced_command = have_forced ? xstrdup("true") : NULL;
1051
1052         if (allowed && rkey != NULL) {
1053                 blob = buffer_get_string(&m, &blen);
1054                 if ((key = key_from_blob(blob, blen)) == NULL)
1055                         fatal("%s: key_from_blob failed", __func__);
1056                 *rkey = key;
1057                 xfree(blob);
1058         }
1059         mm_send_debug(&m);
1060         buffer_free(&m);
1061
1062         return (allowed);
1063 }
1064
1065 BIGNUM *
1066 mm_auth_rsa_generate_challenge(Key *key)
1067 {
1068         Buffer m;
1069         BIGNUM *challenge;
1070         u_char *blob;
1071         u_int blen;
1072
1073         debug3("%s entering", __func__);
1074
1075         if ((challenge = BN_new()) == NULL)
1076                 fatal("%s: BN_new failed", __func__);
1077
1078         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1079         if (key_to_blob(key, &blob, &blen) == 0)
1080                 fatal("%s: key_to_blob failed", __func__);
1081         key->type = KEY_RSA1;
1082
1083         buffer_init(&m);
1084         buffer_put_string(&m, blob, blen);
1085         xfree(blob);
1086
1087         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1088         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1089
1090         buffer_get_bignum2(&m, challenge);
1091         buffer_free(&m);
1092
1093         return (challenge);
1094 }
1095
1096 int
1097 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1098 {
1099         Buffer m;
1100         u_char *blob;
1101         u_int blen;
1102         int success = 0;
1103
1104         debug3("%s entering", __func__);
1105
1106         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1107         if (key_to_blob(key, &blob, &blen) == 0)
1108                 fatal("%s: key_to_blob failed", __func__);
1109         key->type = KEY_RSA1;
1110
1111         buffer_init(&m);
1112         buffer_put_string(&m, blob, blen);
1113         buffer_put_string(&m, response, 16);
1114         xfree(blob);
1115
1116         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1117         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1118
1119         success = buffer_get_int(&m);
1120         buffer_free(&m);
1121
1122         return (success);
1123 }
1124
1125 #ifdef SSH_AUDIT_EVENTS
1126 void
1127 mm_audit_event(ssh_audit_event_t event)
1128 {
1129         Buffer m;
1130
1131         debug3("%s entering", __func__);
1132
1133         buffer_init(&m);
1134         buffer_put_int(&m, event);
1135
1136         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1137         buffer_free(&m);
1138 }
1139
1140 void
1141 mm_audit_run_command(const char *command)
1142 {
1143         Buffer m;
1144
1145         debug3("%s entering command %s", __func__, command);
1146
1147         buffer_init(&m);
1148         buffer_put_cstring(&m, command);
1149
1150         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1151         buffer_free(&m);
1152 }
1153 #endif /* SSH_AUDIT_EVENTS */
1154
1155 #ifdef GSSAPI
1156 OM_uint32
1157 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1158 {
1159         Buffer m;
1160         OM_uint32 major;
1161
1162         /* Client doesn't get to see the context */
1163         *ctx = NULL;
1164
1165         buffer_init(&m);
1166         buffer_put_string(&m, goid->elements, goid->length);
1167
1168         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1169         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1170
1171         major = buffer_get_int(&m);
1172
1173         buffer_free(&m);
1174         return (major);
1175 }
1176
1177 OM_uint32
1178 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1179     gss_buffer_desc *out, OM_uint32 *flags)
1180 {
1181         Buffer m;
1182         OM_uint32 major;
1183         u_int len;
1184
1185         buffer_init(&m);
1186         buffer_put_string(&m, in->value, in->length);
1187
1188         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1189         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1190
1191         major = buffer_get_int(&m);
1192         out->value = buffer_get_string(&m, &len);
1193         out->length = len;
1194         if (flags)
1195                 *flags = buffer_get_int(&m);
1196
1197         buffer_free(&m);
1198
1199         return (major);
1200 }
1201
1202 OM_uint32
1203 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1204 {
1205         Buffer m;
1206         OM_uint32 major;
1207
1208         buffer_init(&m);
1209         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1210         buffer_put_string(&m, gssmic->value, gssmic->length);
1211
1212         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1213         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1214             &m);
1215
1216         major = buffer_get_int(&m);
1217         buffer_free(&m);
1218         return(major);
1219 }
1220
1221 int
1222 mm_ssh_gssapi_userok(char *user)
1223 {
1224         Buffer m;
1225         int authenticated = 0;
1226
1227         buffer_init(&m);
1228
1229         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1230         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1231                                   &m);
1232
1233         authenticated = buffer_get_int(&m);
1234
1235         buffer_free(&m);
1236         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1237         return (authenticated);
1238 }
1239 #endif /* GSSAPI */