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 <stdio.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39
  40 #include <openssl/bn.h>
  41 #include <openssl/dh.h>
  42
  43 #include "xmalloc.h"
  44 #include "ssh.h"
  45 #include "dh.h"
  46 #include "buffer.h"
  47 #include "key.h"
  48 #include "cipher.h"
  49 #include "kex.h"
  50 #include "hostfile.h"
  51 #include "auth.h"
  52 #include "auth-options.h"
  53 #include "packet.h"
  54 #include "mac.h"
  55 #include "log.h"
  56 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  57 #undef TARGET_OS_MAC
  58 #include "zlib.h"
  59 #define TARGET_OS_MAC 1
  60 #else
  61 #include "zlib.h"
  62 #endif
  63 #include "monitor.h"
  64 #ifdef GSSAPI
  65 #include "ssh-gss.h"
  66 #endif
  67 #include "monitor_wrap.h"
  68 #include "atomicio.h"
  69 #include "monitor_fdpass.h"
  70 #include "misc.h"
  71 #include "servconf.h"
  72
  73 #include "channels.h"
  74 #include "session.h"
  75
  76 /* Imports */
  77 extern int compat20;
  78 extern Newkeys *newkeys[];
  79 extern z_stream incoming_stream;
  80 extern z_stream outgoing_stream;
  81 extern struct monitor *pmonitor;
  82 extern Buffer input, output;
  83 extern Buffer loginmsg;
  84 extern ServerOptions options;
  85
  86 int
  87 mm_is_monitor(void)
  88 {
  89         /*
  90          * m_pid is only set in the privileged part, and
  91          * points to the unprivileged child.
  92          */
  93         return (pmonitor && pmonitor->m_pid > 0);
  94 }
  95
  96 void
  97 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
  98 {
  99         u_int mlen = buffer_len(m);
 100         u_char buf[5];
 101
 102         debug3("%s entering: type %d", __func__, type);
 103
 104         put_u32(buf, mlen + 1);
 105         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 106         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 107                 fatal("%s: write: %s", __func__, strerror(errno));
 108         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 109                 fatal("%s: write: %s", __func__, strerror(errno));
 110 }
 111
 112 void
 113 mm_request_receive(int sock, Buffer *m)
 114 {
 115         u_char buf[4];
 116         u_int msg_len;
 117
 118         debug3("%s entering", __func__);
 119
 120         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 121                 if (errno == EPIPE)
 122                         cleanup_exit(255);
 123                 fatal("%s: read: %s", __func__, strerror(errno));
 124         }
 125         msg_len = get_u32(buf);
 126         if (msg_len > 256 * 1024)
 127                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 128         buffer_clear(m);
 129         buffer_append_space(m, msg_len);
 130         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 131                 fatal("%s: read: %s", __func__, strerror(errno));
 132 }
 133
 134 void
 135 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 136 {
 137         u_char rtype;
 138
 139         debug3("%s entering: type %d", __func__, type);
 140
 141         mm_request_receive(sock, m);
 142         rtype = buffer_get_char(m);
 143         if (rtype != type)
 144                 fatal("%s: read: rtype %d != type %d", __func__,
 145                     rtype, type);
 146 }
 147
 148 DH *
 149 mm_choose_dh(int min, int nbits, int max)
 150 {
 151         BIGNUM *p, *g;
 152         int success = 0;
 153         Buffer m;
 154
 155         buffer_init(&m);
 156         buffer_put_int(&m, min);
 157         buffer_put_int(&m, nbits);
 158         buffer_put_int(&m, max);
 159
 160         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 161
 162         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 163         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 164
 165         success = buffer_get_char(&m);
 166         if (success == 0)
 167                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 168
 169         if ((p = BN_new()) == NULL)
 170                 fatal("%s: BN_new failed", __func__);
 171         if ((g = BN_new()) == NULL)
 172                 fatal("%s: BN_new failed", __func__);
 173         buffer_get_bignum2(&m, p);
 174         buffer_get_bignum2(&m, g);
 175
 176         debug3("%s: remaining %d", __func__, buffer_len(&m));
 177         buffer_free(&m);
 178
 179         return (dh_new_group(g, p));
 180 }
 181
 182 int
 183 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 184 {
 185         Kex *kex = *pmonitor->m_pkex;
 186         Buffer m;
 187
 188         debug3("%s entering", __func__);
 189
 190         buffer_init(&m);
 191         buffer_put_int(&m, kex->host_key_index(key));
 192         buffer_put_string(&m, data, datalen);
 193
 194         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 195
 196         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 197         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 198         *sigp  = buffer_get_string(&m, lenp);
 199         buffer_free(&m);
 200
 201         return (0);
 202 }
 203
 204 struct passwd *
 205 mm_getpwnamallow(const char *username)
 206 {
 207         Buffer m;
 208         struct passwd *pw;
 209         u_int pwlen;
 210
 211         debug3("%s entering", __func__);
 212
 213         buffer_init(&m);
 214         buffer_put_cstring(&m, username);
 215
 216         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 217
 218         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 219         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 220
 221         if (buffer_get_char(&m) == 0) {
 222                 buffer_free(&m);
 223                 return (NULL);
 224         }
 225         pw = buffer_get_string(&m, &pwlen);
 226         if (pwlen != sizeof(struct passwd))
 227                 fatal("%s: struct passwd size mismatch", __func__);
 228         pw->pw_name = buffer_get_string(&m, NULL);
 229         pw->pw_passwd = buffer_get_string(&m, NULL);
 230         pw->pw_gecos = buffer_get_string(&m, NULL);
 231 #ifdef HAVE_PW_CLASS_IN_PASSWD
 232         pw->pw_class = buffer_get_string(&m, NULL);
 233 #endif
 234         pw->pw_dir = buffer_get_string(&m, NULL);
 235         pw->pw_shell = buffer_get_string(&m, NULL);
 236         buffer_free(&m);
 237
 238         return (pw);
 239 }
 240
 241 char *
 242 mm_auth2_read_banner(void)
 243 {
 244         Buffer m;
 245         char *banner;
 246
 247         debug3("%s entering", __func__);
 248
 249         buffer_init(&m);
 250         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 251         buffer_clear(&m);
 252
 253         mm_request_receive_expect(pmonitor->m_recvfd,
 254             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 255         banner = buffer_get_string(&m, NULL);
 256         buffer_free(&m);
 257
 258         /* treat empty banner as missing banner */
 259         if (strlen(banner) == 0) {
 260                 xfree(banner);
 261                 banner = NULL;
 262         }
 263         return (banner);
 264 }
 265
 266 /* Inform the privileged process about service and style */
 267
 268 void
 269 mm_inform_authserv(char *service, char *style)
 270 {
 271         Buffer m;
 272
 273         debug3("%s entering", __func__);
 274
 275         buffer_init(&m);
 276         buffer_put_cstring(&m, service);
 277         buffer_put_cstring(&m, style ? style : "");
 278
 279         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 280
 281         buffer_free(&m);
 282 }
 283
 284 /* Do the password authentication */
 285 int
 286 mm_auth_password(Authctxt *authctxt, char *password)
 287 {
 288         Buffer m;
 289         int authenticated = 0;
 290
 291         debug3("%s entering", __func__);
 292
 293         buffer_init(&m);
 294         buffer_put_cstring(&m, password);
 295         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 296
 297         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 298         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 299
 300         authenticated = buffer_get_int(&m);
 301
 302         buffer_free(&m);
 303
 304         debug3("%s: user %sauthenticated",
 305             __func__, authenticated ? "" : "not ");
 306         return (authenticated);
 307 }
 308
 309 int
 310 mm_user_key_allowed(struct passwd *pw, Key *key)
 311 {
 312         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 313 }
 314
 315 int
 316 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 317     Key *key)
 318 {
 319         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 320 }
 321
 322 int
 323 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 324     char *host, Key *key)
 325 {
 326         int ret;
 327
 328         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 329         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 330         key->type = KEY_RSA1;
 331         return (ret);
 332 }
 333
 334 static void
 335 mm_send_debug(Buffer *m)
 336 {
 337         char *msg;
 338
 339         while (buffer_len(m)) {
 340                 msg = buffer_get_string(m, NULL);
 341                 debug3("%s: Sending debug: %s", __func__, msg);
 342                 packet_send_debug("%s", msg);
 343                 xfree(msg);
 344         }
 345 }
 346
 347 int
 348 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 349 {
 350         Buffer m;
 351         u_char *blob;
 352         u_int len;
 353         int allowed = 0, have_forced = 0;
 354
 355         debug3("%s entering", __func__);
 356
 357         /* Convert the key to a blob and the pass it over */
 358         if (!key_to_blob(key, &blob, &len))
 359                 return (0);
 360
 361         buffer_init(&m);
 362         buffer_put_int(&m, type);
 363         buffer_put_cstring(&m, user ? user : "");
 364         buffer_put_cstring(&m, host ? host : "");
 365         buffer_put_string(&m, blob, len);
 366         xfree(blob);
 367
 368         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 369
 370         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 371         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 372
 373         allowed = buffer_get_int(&m);
 374
 375         /* fake forced command */
 376         auth_clear_options();
 377         have_forced = buffer_get_int(&m);
 378         forced_command = have_forced ? xstrdup("true") : NULL;
 379
 380         /* Send potential debug messages */
 381         mm_send_debug(&m);
 382
 383         buffer_free(&m);
 384
 385         return (allowed);
 386 }
 387
 388 /*
 389  * This key verify needs to send the key type along, because the
 390  * privileged parent makes the decision if the key is allowed
 391  * for authentication.
 392  */
 393
 394 int
 395 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 396 {
 397         Buffer m;
 398         u_char *blob;
 399         u_int len;
 400         int verified = 0;
 401
 402         debug3("%s entering", __func__);
 403
 404         /* Convert the key to a blob and the pass it over */
 405         if (!key_to_blob(key, &blob, &len))
 406                 return (0);
 407
 408         buffer_init(&m);
 409         buffer_put_string(&m, blob, len);
 410         buffer_put_string(&m, sig, siglen);
 411         buffer_put_string(&m, data, datalen);
 412         xfree(blob);
 413
 414         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 415
 416         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 417         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 418
 419         verified = buffer_get_int(&m);
 420
 421         buffer_free(&m);
 422
 423         return (verified);
 424 }
 425
 426 /* Export key state after authentication */
 427 Newkeys *
 428 mm_newkeys_from_blob(u_char *blob, int blen)
 429 {
 430         Buffer b;
 431         u_int len;
 432         Newkeys *newkey = NULL;
 433         Enc *enc;
 434         Mac *mac;
 435         Comp *comp;
 436
 437         debug3("%s: %p(%d)", __func__, blob, blen);
 438 #ifdef DEBUG_PK
 439         dump_base64(stderr, blob, blen);
 440 #endif
 441         buffer_init(&b);
 442         buffer_append(&b, blob, blen);
 443
 444         newkey = xmalloc(sizeof(*newkey));
 445         enc = &newkey->enc;
 446         mac = &newkey->mac;
 447         comp = &newkey->comp;
 448
 449         /* Enc structure */
 450         enc->name = buffer_get_string(&b, NULL);
 451         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 452         enc->enabled = buffer_get_int(&b);
 453         enc->block_size = buffer_get_int(&b);
 454         enc->key = buffer_get_string(&b, &enc->key_len);
 455         enc->iv = buffer_get_string(&b, &len);
 456         if (len != enc->block_size)
 457                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 458                     enc->block_size, len);
 459
 460         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 461                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 462                     enc->name, enc->cipher);
 463
 464         /* Mac structure */
 465         mac->name = buffer_get_string(&b, NULL);
 466         if (mac->name == NULL || mac_init(mac, mac->name) == -1)
 467                 fatal("%s: can not init mac %s", __func__, mac->name);
 468         mac->enabled = buffer_get_int(&b);
 469         mac->key = buffer_get_string(&b, &len);
 470         if (len > mac->key_len)
 471                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 472                     mac->key_len);
 473         mac->key_len = len;
 474
 475         /* Comp structure */
 476         comp->type = buffer_get_int(&b);
 477         comp->enabled = buffer_get_int(&b);
 478         comp->name = buffer_get_string(&b, NULL);
 479
 480         len = buffer_len(&b);
 481         if (len != 0)
 482                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 483         buffer_free(&b);
 484         return (newkey);
 485 }
 486
 487 int
 488 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 489 {
 490         Buffer b;
 491         int len;
 492         Enc *enc;
 493         Mac *mac;
 494         Comp *comp;
 495         Newkeys *newkey = newkeys[mode];
 496
 497         debug3("%s: converting %p", __func__, newkey);
 498
 499         if (newkey == NULL) {
 500                 error("%s: newkey == NULL", __func__);
 501                 return 0;
 502         }
 503         enc = &newkey->enc;
 504         mac = &newkey->mac;
 505         comp = &newkey->comp;
 506
 507         buffer_init(&b);
 508         /* Enc structure */
 509         buffer_put_cstring(&b, enc->name);
 510         /* The cipher struct is constant and shared, you export pointer */
 511         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 512         buffer_put_int(&b, enc->enabled);
 513         buffer_put_int(&b, enc->block_size);
 514         buffer_put_string(&b, enc->key, enc->key_len);
 515         packet_get_keyiv(mode, enc->iv, enc->block_size);
 516         buffer_put_string(&b, enc->iv, enc->block_size);
 517
 518         /* Mac structure */
 519         buffer_put_cstring(&b, mac->name);
 520         buffer_put_int(&b, mac->enabled);
 521         buffer_put_string(&b, mac->key, mac->key_len);
 522
 523         /* Comp structure */
 524         buffer_put_int(&b, comp->type);
 525         buffer_put_int(&b, comp->enabled);
 526         buffer_put_cstring(&b, comp->name);
 527
 528         len = buffer_len(&b);
 529         if (lenp != NULL)
 530                 *lenp = len;
 531         if (blobp != NULL) {
 532                 *blobp = xmalloc(len);
 533                 memcpy(*blobp, buffer_ptr(&b), len);
 534         }
 535         memset(buffer_ptr(&b), 0, len);
 536         buffer_free(&b);
 537         return len;
 538 }
 539
 540 static void
 541 mm_send_kex(Buffer *m, Kex *kex)
 542 {
 543         buffer_put_string(m, kex->session_id, kex->session_id_len);
 544         buffer_put_int(m, kex->we_need);
 545         buffer_put_int(m, kex->hostkey_type);
 546         buffer_put_int(m, kex->kex_type);
 547         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 548         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 549         buffer_put_int(m, kex->flags);
 550         buffer_put_cstring(m, kex->client_version_string);
 551         buffer_put_cstring(m, kex->server_version_string);
 552 }
 553
 554 void
 555 mm_send_keystate(struct monitor *monitor)
 556 {
 557         Buffer m;
 558         u_char *blob, *p;
 559         u_int bloblen, plen;
 560         u_int32_t seqnr, packets;
 561         u_int64_t blocks;
 562
 563         buffer_init(&m);
 564
 565         if (!compat20) {
 566                 u_char iv[24];
 567                 u_char *key;
 568                 u_int ivlen, keylen;
 569
 570                 buffer_put_int(&m, packet_get_protocol_flags());
 571
 572                 buffer_put_int(&m, packet_get_ssh1_cipher());
 573
 574                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 575                 keylen = packet_get_encryption_key(NULL);
 576                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 577                 keylen = packet_get_encryption_key(key);
 578                 buffer_put_string(&m, key, keylen);
 579                 memset(key, 0, keylen);
 580                 xfree(key);
 581
 582                 ivlen = packet_get_keyiv_len(MODE_OUT);
 583                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 584                 buffer_put_string(&m, iv, ivlen);
 585                 ivlen = packet_get_keyiv_len(MODE_OUT);
 586                 packet_get_keyiv(MODE_IN, iv, ivlen);
 587                 buffer_put_string(&m, iv, ivlen);
 588                 goto skip;
 589         } else {
 590                 /* Kex for rekeying */
 591                 mm_send_kex(&m, *monitor->m_pkex);
 592         }
 593
 594         debug3("%s: Sending new keys: %p %p",
 595             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 596
 597         /* Keys from Kex */
 598         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 599                 fatal("%s: conversion of newkeys failed", __func__);
 600
 601         buffer_put_string(&m, blob, bloblen);
 602         xfree(blob);
 603
 604         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 605                 fatal("%s: conversion of newkeys failed", __func__);
 606
 607         buffer_put_string(&m, blob, bloblen);
 608         xfree(blob);
 609
 610         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
 611         buffer_put_int(&m, seqnr);
 612         buffer_put_int64(&m, blocks);
 613         buffer_put_int(&m, packets);
 614         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 615         buffer_put_int(&m, seqnr);
 616         buffer_put_int64(&m, blocks);
 617         buffer_put_int(&m, packets);
 618
 619         debug3("%s: New keys have been sent", __func__);
 620  skip:
 621         /* More key context */
 622         plen = packet_get_keycontext(MODE_OUT, NULL);
 623         p = xmalloc(plen+1);
 624         packet_get_keycontext(MODE_OUT, p);
 625         buffer_put_string(&m, p, plen);
 626         xfree(p);
 627
 628         plen = packet_get_keycontext(MODE_IN, NULL);
 629         p = xmalloc(plen+1);
 630         packet_get_keycontext(MODE_IN, p);
 631         buffer_put_string(&m, p, plen);
 632         xfree(p);
 633
 634         /* Compression state */
 635         debug3("%s: Sending compression state", __func__);
 636         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 637         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 638
 639         /* Network I/O buffers */
 640         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 641         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 642
 643         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 644         debug3("%s: Finished sending state", __func__);
 645
 646         buffer_free(&m);
 647 }
 648
 649 int
 650 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 651 {
 652         Buffer m;
 653         char *p, *msg;
 654         int success = 0;
 655
 656         buffer_init(&m);
 657         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 658
 659         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 660         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 661
 662         success = buffer_get_int(&m);
 663         if (success == 0) {
 664                 debug3("%s: pty alloc failed", __func__);
 665                 buffer_free(&m);
 666                 return (0);
 667         }
 668         p = buffer_get_string(&m, NULL);
 669         msg = buffer_get_string(&m, NULL);
 670         buffer_free(&m);
 671
 672         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 673         xfree(p);
 674
 675         buffer_append(&loginmsg, msg, strlen(msg));
 676         xfree(msg);
 677
 678         *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
 679         *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
 680
 681         /* Success */
 682         return (1);
 683 }
 684
 685 void
 686 mm_session_pty_cleanup2(Session *s)
 687 {
 688         Buffer m;
 689
 690         if (s->ttyfd == -1)
 691                 return;
 692         buffer_init(&m);
 693         buffer_put_cstring(&m, s->tty);
 694         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 695         buffer_free(&m);
 696
 697         /* closed dup'ed master */
 698         if (close(s->ptymaster) < 0)
 699                 error("close(s->ptymaster): %s", strerror(errno));
 700
 701         /* unlink pty from session */
 702         s->ttyfd = -1;
 703 }
 704
 705 #ifdef USE_PAM
 706 void
 707 mm_start_pam(Authctxt *authctxt)
 708 {
 709         Buffer m;
 710
 711         debug3("%s entering", __func__);
 712         if (!options.use_pam)
 713                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 714
 715         buffer_init(&m);
 716         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 717
 718         buffer_free(&m);
 719 }
 720
 721 u_int
 722 mm_do_pam_account(void)
 723 {
 724         Buffer m;
 725         u_int ret;
 726         char *msg;
 727
 728         debug3("%s entering", __func__);
 729         if (!options.use_pam)
 730                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 731
 732         buffer_init(&m);
 733         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 734
 735         mm_request_receive_expect(pmonitor->m_recvfd,
 736             MONITOR_ANS_PAM_ACCOUNT, &m);
 737         ret = buffer_get_int(&m);
 738         msg = buffer_get_string(&m, NULL);
 739         buffer_append(&loginmsg, msg, strlen(msg));
 740         xfree(msg);
 741
 742         buffer_free(&m);
 743
 744         debug3("%s returning %d", __func__, ret);
 745
 746         return (ret);
 747 }
 748
 749 void *
 750 mm_sshpam_init_ctx(Authctxt *authctxt)
 751 {
 752         Buffer m;
 753         int success;
 754
 755         debug3("%s", __func__);
 756         buffer_init(&m);
 757         buffer_put_cstring(&m, authctxt->user);
 758         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 759         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 760         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 761         success = buffer_get_int(&m);
 762         if (success == 0) {
 763                 debug3("%s: pam_init_ctx failed", __func__);
 764                 buffer_free(&m);
 765                 return (NULL);
 766         }
 767         buffer_free(&m);
 768         return (authctxt);
 769 }
 770
 771 int
 772 mm_sshpam_query(void *ctx, char **name, char **info,
 773     u_int *num, char ***prompts, u_int **echo_on)
 774 {
 775         Buffer m;
 776         u_int i;
 777         int ret;
 778
 779         debug3("%s", __func__);
 780         buffer_init(&m);
 781         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 782         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 783         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 784         ret = buffer_get_int(&m);
 785         debug3("%s: pam_query returned %d", __func__, ret);
 786         *name = buffer_get_string(&m, NULL);
 787         *info = buffer_get_string(&m, NULL);
 788         *num = buffer_get_int(&m);
 789         if (*num > PAM_MAX_NUM_MSG)
 790                 fatal("%s: recieved %u PAM messages, expected <= %u",
 791                     __func__, *num, PAM_MAX_NUM_MSG);
 792         *prompts = xcalloc((*num + 1), sizeof(char *));
 793         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 794         for (i = 0; i < *num; ++i) {
 795                 (*prompts)[i] = buffer_get_string(&m, NULL);
 796                 (*echo_on)[i] = buffer_get_int(&m);
 797         }
 798         buffer_free(&m);
 799         return (ret);
 800 }
 801
 802 int
 803 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 804 {
 805         Buffer m;
 806         u_int i;
 807         int ret;
 808
 809         debug3("%s", __func__);
 810         buffer_init(&m);
 811         buffer_put_int(&m, num);
 812         for (i = 0; i < num; ++i)
 813                 buffer_put_cstring(&m, resp[i]);
 814         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 815         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 816         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 817         ret = buffer_get_int(&m);
 818         debug3("%s: pam_respond returned %d", __func__, ret);
 819         buffer_free(&m);
 820         return (ret);
 821 }
 822
 823 void
 824 mm_sshpam_free_ctx(void *ctxtp)
 825 {
 826         Buffer m;
 827
 828         debug3("%s", __func__);
 829         buffer_init(&m);
 830         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 831         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 832         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 833         buffer_free(&m);
 834 }
 835 #endif /* USE_PAM */
 836
 837 /* Request process termination */
 838
 839 void
 840 mm_terminate(void)
 841 {
 842         Buffer m;
 843
 844         buffer_init(&m);
 845         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 846         buffer_free(&m);
 847 }
 848
 849 int
 850 mm_ssh1_session_key(BIGNUM *num)
 851 {
 852         int rsafail;
 853         Buffer m;
 854
 855         buffer_init(&m);
 856         buffer_put_bignum2(&m, num);
 857         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 858
 859         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 860
 861         rsafail = buffer_get_int(&m);
 862         buffer_get_bignum2(&m, num);
 863
 864         buffer_free(&m);
 865
 866         return (rsafail);
 867 }
 868
 869 static void
 870 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 871     char ***prompts, u_int **echo_on)
 872 {
 873         *name = xstrdup("");
 874         *infotxt = xstrdup("");
 875         *numprompts = 1;
 876         *prompts = xcalloc(*numprompts, sizeof(char *));
 877         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 878         (*echo_on)[0] = 0;
 879 }
 880
 881 int
 882 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 883    u_int *numprompts, char ***prompts, u_int **echo_on)
 884 {
 885         Buffer m;
 886         u_int success;
 887         char *challenge;
 888
 889         debug3("%s: entering", __func__);
 890
 891         buffer_init(&m);
 892         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 893
 894         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 895             &m);
 896         success = buffer_get_int(&m);
 897         if (success == 0) {
 898                 debug3("%s: no challenge", __func__);
 899                 buffer_free(&m);
 900                 return (-1);
 901         }
 902
 903         /* Get the challenge, and format the response */
 904         challenge  = buffer_get_string(&m, NULL);
 905         buffer_free(&m);
 906
 907         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 908         (*prompts)[0] = challenge;
 909
 910         debug3("%s: received challenge: %s", __func__, challenge);
 911
 912         return (0);
 913 }
 914
 915 int
 916 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 917 {
 918         Buffer m;
 919         int authok;
 920
 921         debug3("%s: entering", __func__);
 922         if (numresponses != 1)
 923                 return (-1);
 924
 925         buffer_init(&m);
 926         buffer_put_cstring(&m, responses[0]);
 927         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 928
 929         mm_request_receive_expect(pmonitor->m_recvfd,
 930             MONITOR_ANS_BSDAUTHRESPOND, &m);
 931
 932         authok = buffer_get_int(&m);
 933         buffer_free(&m);
 934
 935         return ((authok == 0) ? -1 : 0);
 936 }
 937
 938 #ifdef SKEY
 939 int
 940 mm_skey_query(void *ctx, char **name, char **infotxt,
 941    u_int *numprompts, char ***prompts, u_int **echo_on)
 942 {
 943         Buffer m;
 944         u_int success;
 945         char *challenge;
 946
 947         debug3("%s: entering", __func__);
 948
 949         buffer_init(&m);
 950         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 951
 952         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 953             &m);
 954         success = buffer_get_int(&m);
 955         if (success == 0) {
 956                 debug3("%s: no challenge", __func__);
 957                 buffer_free(&m);
 958                 return (-1);
 959         }
 960
 961         /* Get the challenge, and format the response */
 962         challenge  = buffer_get_string(&m, NULL);
 963         buffer_free(&m);
 964
 965         debug3("%s: received challenge: %s", __func__, challenge);
 966
 967         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 968
 969         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
 970         xfree(challenge);
 971
 972         return (0);
 973 }
 974
 975 int
 976 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 977 {
 978         Buffer m;
 979         int authok;
 980
 981         debug3("%s: entering", __func__);
 982         if (numresponses != 1)
 983                 return (-1);
 984
 985         buffer_init(&m);
 986         buffer_put_cstring(&m, responses[0]);
 987         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
 988
 989         mm_request_receive_expect(pmonitor->m_recvfd,
 990             MONITOR_ANS_SKEYRESPOND, &m);
 991
 992         authok = buffer_get_int(&m);
 993         buffer_free(&m);
 994
 995         return ((authok == 0) ? -1 : 0);
 996 }
 997 #endif /* SKEY */
 998
 999 void
1000 mm_ssh1_session_id(u_char session_id[16])
1001 {
1002         Buffer m;
1003         int i;
1004
1005         debug3("%s entering", __func__);
1006
1007         buffer_init(&m);
1008         for (i = 0; i < 16; i++)
1009                 buffer_put_char(&m, session_id[i]);
1010
1011         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1012         buffer_free(&m);
1013 }
1014
1015 int
1016 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1017 {
1018         Buffer m;
1019         Key *key;
1020         u_char *blob;
1021         u_int blen;
1022         int allowed = 0, have_forced = 0;
1023
1024         debug3("%s entering", __func__);
1025
1026         buffer_init(&m);
1027         buffer_put_bignum2(&m, client_n);
1028
1029         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1030         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1031
1032         allowed = buffer_get_int(&m);
1033
1034         /* fake forced command */
1035         auth_clear_options();
1036         have_forced = buffer_get_int(&m);
1037         forced_command = have_forced ? xstrdup("true") : NULL;
1038
1039         if (allowed && rkey != NULL) {
1040                 blob = buffer_get_string(&m, &blen);
1041                 if ((key = key_from_blob(blob, blen)) == NULL)
1042                         fatal("%s: key_from_blob failed", __func__);
1043                 *rkey = key;
1044                 xfree(blob);
1045         }
1046         mm_send_debug(&m);
1047         buffer_free(&m);
1048
1049         return (allowed);
1050 }
1051
1052 BIGNUM *
1053 mm_auth_rsa_generate_challenge(Key *key)
1054 {
1055         Buffer m;
1056         BIGNUM *challenge;
1057         u_char *blob;
1058         u_int blen;
1059
1060         debug3("%s entering", __func__);
1061
1062         if ((challenge = BN_new()) == NULL)
1063                 fatal("%s: BN_new failed", __func__);
1064
1065         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1066         if (key_to_blob(key, &blob, &blen) == 0)
1067                 fatal("%s: key_to_blob failed", __func__);
1068         key->type = KEY_RSA1;
1069
1070         buffer_init(&m);
1071         buffer_put_string(&m, blob, blen);
1072         xfree(blob);
1073
1074         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1075         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1076
1077         buffer_get_bignum2(&m, challenge);
1078         buffer_free(&m);
1079
1080         return (challenge);
1081 }
1082
1083 int
1084 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1085 {
1086         Buffer m;
1087         u_char *blob;
1088         u_int blen;
1089         int success = 0;
1090
1091         debug3("%s entering", __func__);
1092
1093         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1094         if (key_to_blob(key, &blob, &blen) == 0)
1095                 fatal("%s: key_to_blob failed", __func__);
1096         key->type = KEY_RSA1;
1097
1098         buffer_init(&m);
1099         buffer_put_string(&m, blob, blen);
1100         buffer_put_string(&m, response, 16);
1101         xfree(blob);
1102
1103         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1104         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1105
1106         success = buffer_get_int(&m);
1107         buffer_free(&m);
1108
1109         return (success);
1110 }
1111
1112 #ifdef SSH_AUDIT_EVENTS
1113 void
1114 mm_audit_event(ssh_audit_event_t event)
1115 {
1116         Buffer m;
1117
1118         debug3("%s entering", __func__);
1119
1120         buffer_init(&m);
1121         buffer_put_int(&m, event);
1122
1123         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1124         buffer_free(&m);
1125 }
1126
1127 void
1128 mm_audit_run_command(const char *command)
1129 {
1130         Buffer m;
1131
1132         debug3("%s entering command %s", __func__, command);
1133
1134         buffer_init(&m);
1135         buffer_put_cstring(&m, command);
1136
1137         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1138         buffer_free(&m);
1139 }
1140 #endif /* SSH_AUDIT_EVENTS */
1141
1142 #ifdef GSSAPI
1143 OM_uint32
1144 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1145 {
1146         Buffer m;
1147         OM_uint32 major;
1148
1149         /* Client doesn't get to see the context */
1150         *ctx = NULL;
1151
1152         buffer_init(&m);
1153         buffer_put_string(&m, goid->elements, goid->length);
1154
1155         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1156         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1157
1158         major = buffer_get_int(&m);
1159
1160         buffer_free(&m);
1161         return (major);
1162 }
1163
1164 OM_uint32
1165 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1166     gss_buffer_desc *out, OM_uint32 *flags)
1167 {
1168         Buffer m;
1169         OM_uint32 major;
1170         u_int len;
1171
1172         buffer_init(&m);
1173         buffer_put_string(&m, in->value, in->length);
1174
1175         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1176         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1177
1178         major = buffer_get_int(&m);
1179         out->value = buffer_get_string(&m, &len);
1180         out->length = len;
1181         if (flags)
1182                 *flags = buffer_get_int(&m);
1183
1184         buffer_free(&m);
1185
1186         return (major);
1187 }
1188
1189 OM_uint32
1190 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1191 {
1192         Buffer m;
1193         OM_uint32 major;
1194
1195         buffer_init(&m);
1196         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1197         buffer_put_string(&m, gssmic->value, gssmic->length);
1198
1199         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1200         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1201             &m);
1202
1203         major = buffer_get_int(&m);
1204         buffer_free(&m);
1205         return(major);
1206 }
1207
1208 int
1209 mm_ssh_gssapi_userok(char *user)
1210 {
1211         Buffer m;
1212         int authenticated = 0;
1213
1214         buffer_init(&m);
1215
1216         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1217         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1218                                   &m);
1219
1220         authenticated = buffer_get_int(&m);
1221
1222         buffer_free(&m);
1223         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1224         return (authenticated);
1225 }
1226 #endif /* GSSAPI */