crypto/openssh-3.8.1p1/monitor_wrap.c

   1 /*
   2  * Copyright 2002 Niels Provos <provos@citi.umich.edu>
   3  * Copyright 2002 Markus Friedl <markus@openbsd.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "includes.h"
  28 RCSID("$OpenBSD: monitor_wrap.c,v 1.35 2003/11/17 11:06:07 markus Exp $");
  29
  30 #include <openssl/bn.h>
  31 #include <openssl/dh.h>
  32
  33 #include "ssh.h"
  34 #include "dh.h"
  35 #include "kex.h"
  36 #include "auth.h"
  37 #include "auth-options.h"
  38 #include "buffer.h"
  39 #include "bufaux.h"
  40 #include "packet.h"
  41 #include "mac.h"
  42 #include "log.h"
  43 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  44 #undef TARGET_OS_MAC
  45 #include "zlib.h"
  46 #define TARGET_OS_MAC 1
  47 #else
  48 #include "zlib.h"
  49 #endif
  50 #include "monitor.h"
  51 #include "monitor_wrap.h"
  52 #include "xmalloc.h"
  53 #include "atomicio.h"
  54 #include "monitor_fdpass.h"
  55 #include "getput.h"
  56 #include "servconf.h"
  57
  58 #include "auth.h"
  59 #include "channels.h"
  60 #include "session.h"
  61
  62 #ifdef GSSAPI
  63 #include "ssh-gss.h"
  64 #endif
  65
  66 /* Imports */
  67 extern int compat20;
  68 extern Newkeys *newkeys[];
  69 extern z_stream incoming_stream;
  70 extern z_stream outgoing_stream;
  71 extern struct monitor *pmonitor;
  72 extern Buffer input, output;
  73 extern ServerOptions options;
  74
  75 int
  76 mm_is_monitor(void)
  77 {
  78         /*
  79          * m_pid is only set in the privileged part, and
  80          * points to the unprivileged child.
  81          */
  82         return (pmonitor && pmonitor->m_pid > 0);
  83 }
  84
  85 void
  86 mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
  87 {
  88         u_int mlen = buffer_len(m);
  89         u_char buf[5];
  90
  91         debug3("%s entering: type %d", __func__, type);
  92
  93         PUT_32BIT(buf, mlen + 1);
  94         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
  95         if (atomicio(vwrite, socket, buf, sizeof(buf)) != sizeof(buf))
  96                 fatal("%s: write", __func__);
  97         if (atomicio(vwrite, socket, buffer_ptr(m), mlen) != mlen)
  98                 fatal("%s: write", __func__);
  99 }
 100
 101 void
 102 mm_request_receive(int socket, Buffer *m)
 103 {
 104         u_char buf[4];
 105         u_int msg_len;
 106         ssize_t res;
 107
 108         debug3("%s entering", __func__);
 109
 110         res = atomicio(read, socket, buf, sizeof(buf));
 111         if (res != sizeof(buf)) {
 112                 if (res == 0)
 113                         cleanup_exit(255);
 114                 fatal("%s: read: %ld", __func__, (long)res);
 115         }
 116         msg_len = GET_32BIT(buf);
 117         if (msg_len > 256 * 1024)
 118                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 119         buffer_clear(m);
 120         buffer_append_space(m, msg_len);
 121         res = atomicio(read, socket, buffer_ptr(m), msg_len);
 122         if (res != msg_len)
 123                 fatal("%s: read: %ld != msg_len", __func__, (long)res);
 124 }
 125
 126 void
 127 mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
 128 {
 129         u_char rtype;
 130
 131         debug3("%s entering: type %d", __func__, type);
 132
 133         mm_request_receive(socket, m);
 134         rtype = buffer_get_char(m);
 135         if (rtype != type)
 136                 fatal("%s: read: rtype %d != type %d", __func__,
 137                     rtype, type);
 138 }
 139
 140 DH *
 141 mm_choose_dh(int min, int nbits, int max)
 142 {
 143         BIGNUM *p, *g;
 144         int success = 0;
 145         Buffer m;
 146
 147         buffer_init(&m);
 148         buffer_put_int(&m, min);
 149         buffer_put_int(&m, nbits);
 150         buffer_put_int(&m, max);
 151
 152         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 153
 154         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 155         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 156
 157         success = buffer_get_char(&m);
 158         if (success == 0)
 159                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 160
 161         if ((p = BN_new()) == NULL)
 162                 fatal("%s: BN_new failed", __func__);
 163         if ((g = BN_new()) == NULL)
 164                 fatal("%s: BN_new failed", __func__);
 165         buffer_get_bignum2(&m, p);
 166         buffer_get_bignum2(&m, g);
 167
 168         debug3("%s: remaining %d", __func__, buffer_len(&m));
 169         buffer_free(&m);
 170
 171         return (dh_new_group(g, p));
 172 }
 173
 174 int
 175 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 176 {
 177         Kex *kex = *pmonitor->m_pkex;
 178         Buffer m;
 179
 180         debug3("%s entering", __func__);
 181
 182         buffer_init(&m);
 183         buffer_put_int(&m, kex->host_key_index(key));
 184         buffer_put_string(&m, data, datalen);
 185
 186         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 187
 188         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 189         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 190         *sigp  = buffer_get_string(&m, lenp);
 191         buffer_free(&m);
 192
 193         return (0);
 194 }
 195
 196 struct passwd *
 197 mm_getpwnamallow(const char *login)
 198 {
 199         Buffer m;
 200         struct passwd *pw;
 201         u_int pwlen;
 202
 203         debug3("%s entering", __func__);
 204
 205         buffer_init(&m);
 206         buffer_put_cstring(&m, login);
 207
 208         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 209
 210         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 211         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 212
 213         if (buffer_get_char(&m) == 0) {
 214                 buffer_free(&m);
 215                 return (NULL);
 216         }
 217         pw = buffer_get_string(&m, &pwlen);
 218         if (pwlen != sizeof(struct passwd))
 219                 fatal("%s: struct passwd size mismatch", __func__);
 220         pw->pw_name = buffer_get_string(&m, NULL);
 221         pw->pw_passwd = buffer_get_string(&m, NULL);
 222         pw->pw_gecos = buffer_get_string(&m, NULL);
 223 #ifdef HAVE_PW_CLASS_IN_PASSWD
 224         pw->pw_class = buffer_get_string(&m, NULL);
 225 #endif
 226         pw->pw_dir = buffer_get_string(&m, NULL);
 227         pw->pw_shell = buffer_get_string(&m, NULL);
 228         buffer_free(&m);
 229
 230         return (pw);
 231 }
 232
 233 char *
 234 mm_auth2_read_banner(void)
 235 {
 236         Buffer m;
 237         char *banner;
 238
 239         debug3("%s entering", __func__);
 240
 241         buffer_init(&m);
 242         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 243         buffer_clear(&m);
 244
 245         mm_request_receive_expect(pmonitor->m_recvfd,
 246             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 247         banner = buffer_get_string(&m, NULL);
 248         buffer_free(&m);
 249
 250         /* treat empty banner as missing banner */
 251         if (strlen(banner) == 0) {
 252                 xfree(banner);
 253                 banner = NULL;
 254         }
 255         return (banner);
 256 }
 257
 258 /* Inform the privileged process about service and style */
 259
 260 void
 261 mm_inform_authserv(char *service, char *style)
 262 {
 263         Buffer m;
 264
 265         debug3("%s entering", __func__);
 266
 267         buffer_init(&m);
 268         buffer_put_cstring(&m, service);
 269         buffer_put_cstring(&m, style ? style : "");
 270
 271         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 272
 273         buffer_free(&m);
 274 }
 275
 276 /* Do the password authentication */
 277 int
 278 mm_auth_password(Authctxt *authctxt, char *password)
 279 {
 280         Buffer m;
 281         int authenticated = 0;
 282
 283         debug3("%s entering", __func__);
 284
 285         buffer_init(&m);
 286         buffer_put_cstring(&m, password);
 287         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 288
 289         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 290         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 291
 292         authenticated = buffer_get_int(&m);
 293
 294         buffer_free(&m);
 295
 296         debug3("%s: user %sauthenticated",
 297             __func__, authenticated ? "" : "not ");
 298         return (authenticated);
 299 }
 300
 301 int
 302 mm_user_key_allowed(struct passwd *pw, Key *key)
 303 {
 304         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 305 }
 306
 307 int
 308 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 309     Key *key)
 310 {
 311         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 312 }
 313
 314 int
 315 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 316     char *host, Key *key)
 317 {
 318         int ret;
 319
 320         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 321         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 322         key->type = KEY_RSA1;
 323         return (ret);
 324 }
 325
 326 static void
 327 mm_send_debug(Buffer *m)
 328 {
 329         char *msg;
 330
 331         while (buffer_len(m)) {
 332                 msg = buffer_get_string(m, NULL);
 333                 debug3("%s: Sending debug: %s", __func__, msg);
 334                 packet_send_debug("%s", msg);
 335                 xfree(msg);
 336         }
 337 }
 338
 339 int
 340 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 341 {
 342         Buffer m;
 343         u_char *blob;
 344         u_int len;
 345         int allowed = 0, have_forced = 0;
 346
 347         debug3("%s entering", __func__);
 348
 349         /* Convert the key to a blob and the pass it over */
 350         if (!key_to_blob(key, &blob, &len))
 351                 return (0);
 352
 353         buffer_init(&m);
 354         buffer_put_int(&m, type);
 355         buffer_put_cstring(&m, user ? user : "");
 356         buffer_put_cstring(&m, host ? host : "");
 357         buffer_put_string(&m, blob, len);
 358         xfree(blob);
 359
 360         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 361
 362         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 363         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 364
 365         allowed = buffer_get_int(&m);
 366
 367         /* fake forced command */
 368         auth_clear_options();
 369         have_forced = buffer_get_int(&m);
 370         forced_command = have_forced ? xstrdup("true") : NULL;
 371
 372         /* Send potential debug messages */
 373         mm_send_debug(&m);
 374
 375         buffer_free(&m);
 376
 377         return (allowed);
 378 }
 379
 380 /*
 381  * This key verify needs to send the key type along, because the
 382  * privileged parent makes the decision if the key is allowed
 383  * for authentication.
 384  */
 385
 386 int
 387 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 388 {
 389         Buffer m;
 390         u_char *blob;
 391         u_int len;
 392         int verified = 0;
 393
 394         debug3("%s entering", __func__);
 395
 396         /* Convert the key to a blob and the pass it over */
 397         if (!key_to_blob(key, &blob, &len))
 398                 return (0);
 399
 400         buffer_init(&m);
 401         buffer_put_string(&m, blob, len);
 402         buffer_put_string(&m, sig, siglen);
 403         buffer_put_string(&m, data, datalen);
 404         xfree(blob);
 405
 406         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 407
 408         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 409         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 410
 411         verified = buffer_get_int(&m);
 412
 413         buffer_free(&m);
 414
 415         return (verified);
 416 }
 417
 418 /* Export key state after authentication */
 419 Newkeys *
 420 mm_newkeys_from_blob(u_char *blob, int blen)
 421 {
 422         Buffer b;
 423         u_int len;
 424         Newkeys *newkey = NULL;
 425         Enc *enc;
 426         Mac *mac;
 427         Comp *comp;
 428
 429         debug3("%s: %p(%d)", __func__, blob, blen);
 430 #ifdef DEBUG_PK
 431         dump_base64(stderr, blob, blen);
 432 #endif
 433         buffer_init(&b);
 434         buffer_append(&b, blob, blen);
 435
 436         newkey = xmalloc(sizeof(*newkey));
 437         enc = &newkey->enc;
 438         mac = &newkey->mac;
 439         comp = &newkey->comp;
 440
 441         /* Enc structure */
 442         enc->name = buffer_get_string(&b, NULL);
 443         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 444         enc->enabled = buffer_get_int(&b);
 445         enc->block_size = buffer_get_int(&b);
 446         enc->key = buffer_get_string(&b, &enc->key_len);
 447         enc->iv = buffer_get_string(&b, &len);
 448         if (len != enc->block_size)
 449                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 450                     enc->block_size, len);
 451
 452         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 453                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 454                     enc->name, enc->cipher);
 455
 456         /* Mac structure */
 457         mac->name = buffer_get_string(&b, NULL);
 458         if (mac->name == NULL || mac_init(mac, mac->name) == -1)
 459                 fatal("%s: can not init mac %s", __func__, mac->name);
 460         mac->enabled = buffer_get_int(&b);
 461         mac->key = buffer_get_string(&b, &len);
 462         if (len > mac->key_len)
 463                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 464                     mac->key_len);
 465         mac->key_len = len;
 466
 467         /* Comp structure */
 468         comp->type = buffer_get_int(&b);
 469         comp->enabled = buffer_get_int(&b);
 470         comp->name = buffer_get_string(&b, NULL);
 471
 472         len = buffer_len(&b);
 473         if (len != 0)
 474                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 475         buffer_free(&b);
 476         return (newkey);
 477 }
 478
 479 int
 480 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 481 {
 482         Buffer b;
 483         int len;
 484         Enc *enc;
 485         Mac *mac;
 486         Comp *comp;
 487         Newkeys *newkey = newkeys[mode];
 488
 489         debug3("%s: converting %p", __func__, newkey);
 490
 491         if (newkey == NULL) {
 492                 error("%s: newkey == NULL", __func__);
 493                 return 0;
 494         }
 495         enc = &newkey->enc;
 496         mac = &newkey->mac;
 497         comp = &newkey->comp;
 498
 499         buffer_init(&b);
 500         /* Enc structure */
 501         buffer_put_cstring(&b, enc->name);
 502         /* The cipher struct is constant and shared, you export pointer */
 503         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 504         buffer_put_int(&b, enc->enabled);
 505         buffer_put_int(&b, enc->block_size);
 506         buffer_put_string(&b, enc->key, enc->key_len);
 507         packet_get_keyiv(mode, enc->iv, enc->block_size);
 508         buffer_put_string(&b, enc->iv, enc->block_size);
 509
 510         /* Mac structure */
 511         buffer_put_cstring(&b, mac->name);
 512         buffer_put_int(&b, mac->enabled);
 513         buffer_put_string(&b, mac->key, mac->key_len);
 514
 515         /* Comp structure */
 516         buffer_put_int(&b, comp->type);
 517         buffer_put_int(&b, comp->enabled);
 518         buffer_put_cstring(&b, comp->name);
 519
 520         len = buffer_len(&b);
 521         if (lenp != NULL)
 522                 *lenp = len;
 523         if (blobp != NULL) {
 524                 *blobp = xmalloc(len);
 525                 memcpy(*blobp, buffer_ptr(&b), len);
 526         }
 527         memset(buffer_ptr(&b), 0, len);
 528         buffer_free(&b);
 529         return len;
 530 }
 531
 532 static void
 533 mm_send_kex(Buffer *m, Kex *kex)
 534 {
 535         buffer_put_string(m, kex->session_id, kex->session_id_len);
 536         buffer_put_int(m, kex->we_need);
 537         buffer_put_int(m, kex->hostkey_type);
 538         buffer_put_int(m, kex->kex_type);
 539         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 540         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 541         buffer_put_int(m, kex->flags);
 542         buffer_put_cstring(m, kex->client_version_string);
 543         buffer_put_cstring(m, kex->server_version_string);
 544 }
 545
 546 void
 547 mm_send_keystate(struct monitor *pmonitor)
 548 {
 549         Buffer m;
 550         u_char *blob, *p;
 551         u_int bloblen, plen;
 552         u_int32_t seqnr, packets;
 553         u_int64_t blocks;
 554
 555         buffer_init(&m);
 556
 557         if (!compat20) {
 558                 u_char iv[24];
 559                 u_char *key;
 560                 u_int ivlen, keylen;
 561
 562                 buffer_put_int(&m, packet_get_protocol_flags());
 563
 564                 buffer_put_int(&m, packet_get_ssh1_cipher());
 565
 566                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 567                 keylen = packet_get_encryption_key(NULL);
 568                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 569                 keylen = packet_get_encryption_key(key);
 570                 buffer_put_string(&m, key, keylen);
 571                 memset(key, 0, keylen);
 572                 xfree(key);
 573
 574                 ivlen = packet_get_keyiv_len(MODE_OUT);
 575                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 576                 buffer_put_string(&m, iv, ivlen);
 577                 ivlen = packet_get_keyiv_len(MODE_OUT);
 578                 packet_get_keyiv(MODE_IN, iv, ivlen);
 579                 buffer_put_string(&m, iv, ivlen);
 580                 goto skip;
 581         } else {
 582                 /* Kex for rekeying */
 583                 mm_send_kex(&m, *pmonitor->m_pkex);
 584         }
 585
 586         debug3("%s: Sending new keys: %p %p",
 587             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 588
 589         /* Keys from Kex */
 590         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 591                 fatal("%s: conversion of newkeys failed", __func__);
 592
 593         buffer_put_string(&m, blob, bloblen);
 594         xfree(blob);
 595
 596         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 597                 fatal("%s: conversion of newkeys failed", __func__);
 598
 599         buffer_put_string(&m, blob, bloblen);
 600         xfree(blob);
 601
 602         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
 603         buffer_put_int(&m, seqnr);
 604         buffer_put_int64(&m, blocks);
 605         buffer_put_int(&m, packets);
 606         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 607         buffer_put_int(&m, seqnr);
 608         buffer_put_int64(&m, blocks);
 609         buffer_put_int(&m, packets);
 610
 611         debug3("%s: New keys have been sent", __func__);
 612  skip:
 613         /* More key context */
 614         plen = packet_get_keycontext(MODE_OUT, NULL);
 615         p = xmalloc(plen+1);
 616         packet_get_keycontext(MODE_OUT, p);
 617         buffer_put_string(&m, p, plen);
 618         xfree(p);
 619
 620         plen = packet_get_keycontext(MODE_IN, NULL);
 621         p = xmalloc(plen+1);
 622         packet_get_keycontext(MODE_IN, p);
 623         buffer_put_string(&m, p, plen);
 624         xfree(p);
 625
 626         /* Compression state */
 627         debug3("%s: Sending compression state", __func__);
 628         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 629         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 630
 631         /* Network I/O buffers */
 632         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 633         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 634
 635         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 636         debug3("%s: Finished sending state", __func__);
 637
 638         buffer_free(&m);
 639 }
 640
 641 int
 642 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
 643 {
 644         Buffer m;
 645         char *p;
 646         int success = 0;
 647
 648         buffer_init(&m);
 649         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 650
 651         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 652         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 653
 654         success = buffer_get_int(&m);
 655         if (success == 0) {
 656                 debug3("%s: pty alloc failed", __func__);
 657                 buffer_free(&m);
 658                 return (0);
 659         }
 660         p = buffer_get_string(&m, NULL);
 661         buffer_free(&m);
 662
 663         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 664         xfree(p);
 665
 666         *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
 667         *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
 668
 669         /* Success */
 670         return (1);
 671 }
 672
 673 void
 674 mm_session_pty_cleanup2(Session *s)
 675 {
 676         Buffer m;
 677
 678         if (s->ttyfd == -1)
 679                 return;
 680         buffer_init(&m);
 681         buffer_put_cstring(&m, s->tty);
 682         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 683         buffer_free(&m);
 684
 685         /* closed dup'ed master */
 686         if (close(s->ptymaster) < 0)
 687                 error("close(s->ptymaster): %s", strerror(errno));
 688
 689         /* unlink pty from session */
 690         s->ttyfd = -1;
 691 }
 692
 693 #ifdef USE_PAM
 694 void
 695 mm_start_pam(Authctxt *authctxt)
 696 {
 697         Buffer m;
 698
 699         debug3("%s entering", __func__);
 700         if (!options.use_pam)
 701                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 702
 703         buffer_init(&m);
 704         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 705
 706         buffer_free(&m);
 707 }
 708
 709 u_int
 710 mm_do_pam_account(void)
 711 {
 712         Buffer m;
 713         u_int ret;
 714
 715         debug3("%s entering", __func__);
 716         if (!options.use_pam)
 717                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 718
 719         buffer_init(&m);
 720         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 721
 722         mm_request_receive_expect(pmonitor->m_recvfd,
 723             MONITOR_ANS_PAM_ACCOUNT, &m);
 724         ret = buffer_get_int(&m);
 725
 726         buffer_free(&m);
 727
 728         debug3("%s returning %d", __func__, ret);
 729
 730         return (ret);
 731 }
 732
 733 void *
 734 mm_sshpam_init_ctx(Authctxt *authctxt)
 735 {
 736         Buffer m;
 737         int success;
 738
 739         debug3("%s", __func__);
 740         buffer_init(&m);
 741         buffer_put_cstring(&m, authctxt->user);
 742         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 743         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 744         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 745         success = buffer_get_int(&m);
 746         if (success == 0) {
 747                 debug3("%s: pam_init_ctx failed", __func__);
 748                 buffer_free(&m);
 749                 return (NULL);
 750         }
 751         buffer_free(&m);
 752         return (authctxt);
 753 }
 754
 755 int
 756 mm_sshpam_query(void *ctx, char **name, char **info,
 757     u_int *num, char ***prompts, u_int **echo_on)
 758 {
 759         Buffer m;
 760         int i, ret;
 761
 762         debug3("%s", __func__);
 763         buffer_init(&m);
 764         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 765         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 766         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 767         ret = buffer_get_int(&m);
 768         debug3("%s: pam_query returned %d", __func__, ret);
 769         *name = buffer_get_string(&m, NULL);
 770         *info = buffer_get_string(&m, NULL);
 771         *num = buffer_get_int(&m);
 772         *prompts = xmalloc((*num + 1) * sizeof(char *));
 773         *echo_on = xmalloc((*num + 1) * sizeof(u_int));
 774         for (i = 0; i < *num; ++i) {
 775                 (*prompts)[i] = buffer_get_string(&m, NULL);
 776                 (*echo_on)[i] = buffer_get_int(&m);
 777         }
 778         buffer_free(&m);
 779         return (ret);
 780 }
 781
 782 int
 783 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 784 {
 785         Buffer m;
 786         int i, ret;
 787
 788         debug3("%s", __func__);
 789         buffer_init(&m);
 790         buffer_put_int(&m, num);
 791         for (i = 0; i < num; ++i)
 792                 buffer_put_cstring(&m, resp[i]);
 793         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 794         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 795         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 796         ret = buffer_get_int(&m);
 797         debug3("%s: pam_respond returned %d", __func__, ret);
 798         buffer_free(&m);
 799         return (ret);
 800 }
 801
 802 void
 803 mm_sshpam_free_ctx(void *ctxtp)
 804 {
 805         Buffer m;
 806
 807         debug3("%s", __func__);
 808         buffer_init(&m);
 809         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 810         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 811         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 812         buffer_free(&m);
 813 }
 814 #endif /* USE_PAM */
 815
 816 /* Request process termination */
 817
 818 void
 819 mm_terminate(void)
 820 {
 821         Buffer m;
 822
 823         buffer_init(&m);
 824         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 825         buffer_free(&m);
 826 }
 827
 828 int
 829 mm_ssh1_session_key(BIGNUM *num)
 830 {
 831         int rsafail;
 832         Buffer m;
 833
 834         buffer_init(&m);
 835         buffer_put_bignum2(&m, num);
 836         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 837
 838         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 839
 840         rsafail = buffer_get_int(&m);
 841         buffer_get_bignum2(&m, num);
 842
 843         buffer_free(&m);
 844
 845         return (rsafail);
 846 }
 847
 848 static void
 849 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 850     char ***prompts, u_int **echo_on)
 851 {
 852         *name = xstrdup("");
 853         *infotxt = xstrdup("");
 854         *numprompts = 1;
 855         *prompts = xmalloc(*numprompts * sizeof(char *));
 856         *echo_on = xmalloc(*numprompts * sizeof(u_int));
 857         (*echo_on)[0] = 0;
 858 }
 859
 860 int
 861 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 862    u_int *numprompts, char ***prompts, u_int **echo_on)
 863 {
 864         Buffer m;
 865         u_int success;
 866         char *challenge;
 867
 868         debug3("%s: entering", __func__);
 869
 870         buffer_init(&m);
 871         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 872
 873         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 874             &m);
 875         success = buffer_get_int(&m);
 876         if (success == 0) {
 877                 debug3("%s: no challenge", __func__);
 878                 buffer_free(&m);
 879                 return (-1);
 880         }
 881
 882         /* Get the challenge, and format the response */
 883         challenge  = buffer_get_string(&m, NULL);
 884         buffer_free(&m);
 885
 886         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 887         (*prompts)[0] = challenge;
 888
 889         debug3("%s: received challenge: %s", __func__, challenge);
 890
 891         return (0);
 892 }
 893
 894 int
 895 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 896 {
 897         Buffer m;
 898         int authok;
 899
 900         debug3("%s: entering", __func__);
 901         if (numresponses != 1)
 902                 return (-1);
 903
 904         buffer_init(&m);
 905         buffer_put_cstring(&m, responses[0]);
 906         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 907
 908         mm_request_receive_expect(pmonitor->m_recvfd,
 909             MONITOR_ANS_BSDAUTHRESPOND, &m);
 910
 911         authok = buffer_get_int(&m);
 912         buffer_free(&m);
 913
 914         return ((authok == 0) ? -1 : 0);
 915 }
 916
 917 int
 918 mm_skey_query(void *ctx, char **name, char **infotxt,
 919    u_int *numprompts, char ***prompts, u_int **echo_on)
 920 {
 921         Buffer m;
 922         int len;
 923         u_int success;
 924         char *p, *challenge;
 925
 926         debug3("%s: entering", __func__);
 927
 928         buffer_init(&m);
 929         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 930
 931         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 932             &m);
 933         success = buffer_get_int(&m);
 934         if (success == 0) {
 935                 debug3("%s: no challenge", __func__);
 936                 buffer_free(&m);
 937                 return (-1);
 938         }
 939
 940         /* Get the challenge, and format the response */
 941         challenge  = buffer_get_string(&m, NULL);
 942         buffer_free(&m);
 943
 944         debug3("%s: received challenge: %s", __func__, challenge);
 945
 946         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 947
 948         len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
 949         p = xmalloc(len);
 950         strlcpy(p, challenge, len);
 951         strlcat(p, SKEY_PROMPT, len);
 952         (*prompts)[0] = p;
 953         xfree(challenge);
 954
 955         return (0);
 956 }
 957
 958 int
 959 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 960 {
 961         Buffer m;
 962         int authok;
 963
 964         debug3("%s: entering", __func__);
 965         if (numresponses != 1)
 966                 return (-1);
 967
 968         buffer_init(&m);
 969         buffer_put_cstring(&m, responses[0]);
 970         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
 971
 972         mm_request_receive_expect(pmonitor->m_recvfd,
 973             MONITOR_ANS_SKEYRESPOND, &m);
 974
 975         authok = buffer_get_int(&m);
 976         buffer_free(&m);
 977
 978         return ((authok == 0) ? -1 : 0);
 979 }
 980
 981 void
 982 mm_ssh1_session_id(u_char session_id[16])
 983 {
 984         Buffer m;
 985         int i;
 986
 987         debug3("%s entering", __func__);
 988
 989         buffer_init(&m);
 990         for (i = 0; i < 16; i++)
 991                 buffer_put_char(&m, session_id[i]);
 992
 993         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
 994         buffer_free(&m);
 995 }
 996
 997 int
 998 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
 999 {
1000         Buffer m;
1001         Key *key;
1002         u_char *blob;
1003         u_int blen;
1004         int allowed = 0, have_forced = 0;
1005
1006         debug3("%s entering", __func__);
1007
1008         buffer_init(&m);
1009         buffer_put_bignum2(&m, client_n);
1010
1011         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1012         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1013
1014         allowed = buffer_get_int(&m);
1015
1016         /* fake forced command */
1017         auth_clear_options();
1018         have_forced = buffer_get_int(&m);
1019         forced_command = have_forced ? xstrdup("true") : NULL;
1020
1021         if (allowed && rkey != NULL) {
1022                 blob = buffer_get_string(&m, &blen);
1023                 if ((key = key_from_blob(blob, blen)) == NULL)
1024                         fatal("%s: key_from_blob failed", __func__);
1025                 *rkey = key;
1026                 xfree(blob);
1027         }
1028         mm_send_debug(&m);
1029         buffer_free(&m);
1030
1031         return (allowed);
1032 }
1033
1034 BIGNUM *
1035 mm_auth_rsa_generate_challenge(Key *key)
1036 {
1037         Buffer m;
1038         BIGNUM *challenge;
1039         u_char *blob;
1040         u_int blen;
1041
1042         debug3("%s entering", __func__);
1043
1044         if ((challenge = BN_new()) == NULL)
1045                 fatal("%s: BN_new failed", __func__);
1046
1047         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1048         if (key_to_blob(key, &blob, &blen) == 0)
1049                 fatal("%s: key_to_blob failed", __func__);
1050         key->type = KEY_RSA1;
1051
1052         buffer_init(&m);
1053         buffer_put_string(&m, blob, blen);
1054         xfree(blob);
1055
1056         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1057         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1058
1059         buffer_get_bignum2(&m, challenge);
1060         buffer_free(&m);
1061
1062         return (challenge);
1063 }
1064
1065 int
1066 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1067 {
1068         Buffer m;
1069         u_char *blob;
1070         u_int blen;
1071         int success = 0;
1072
1073         debug3("%s entering", __func__);
1074
1075         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1076         if (key_to_blob(key, &blob, &blen) == 0)
1077                 fatal("%s: key_to_blob failed", __func__);
1078         key->type = KEY_RSA1;
1079
1080         buffer_init(&m);
1081         buffer_put_string(&m, blob, blen);
1082         buffer_put_string(&m, response, 16);
1083         xfree(blob);
1084
1085         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1086         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1087
1088         success = buffer_get_int(&m);
1089         buffer_free(&m);
1090
1091         return (success);
1092 }
1093
1094 #ifdef GSSAPI
1095 OM_uint32
1096 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid)
1097 {
1098         Buffer m;
1099         OM_uint32 major;
1100
1101         /* Client doesn't get to see the context */
1102         *ctx = NULL;
1103
1104         buffer_init(&m);
1105         buffer_put_string(&m, oid->elements, oid->length);
1106
1107         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1108         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1109
1110         major = buffer_get_int(&m);
1111
1112         buffer_free(&m);
1113         return (major);
1114 }
1115
1116 OM_uint32
1117 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1118     gss_buffer_desc *out, OM_uint32 *flags)
1119 {
1120         Buffer m;
1121         OM_uint32 major;
1122         u_int len;
1123
1124         buffer_init(&m);
1125         buffer_put_string(&m, in->value, in->length);
1126
1127         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1128         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1129
1130         major = buffer_get_int(&m);
1131         out->value = buffer_get_string(&m, &len);
1132         out->length = len;
1133         if (flags)
1134                 *flags = buffer_get_int(&m);
1135
1136         buffer_free(&m);
1137
1138         return (major);
1139 }
1140
1141 OM_uint32
1142 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1143 {
1144         Buffer m;
1145         OM_uint32 major;
1146
1147         buffer_init(&m);
1148         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1149         buffer_put_string(&m, gssmic->value, gssmic->length);
1150
1151         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1152         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1153             &m);
1154
1155         major = buffer_get_int(&m);
1156         buffer_free(&m);
1157         return(major);
1158 }
1159
1160 int
1161 mm_ssh_gssapi_userok(char *user)
1162 {
1163         Buffer m;
1164         int authenticated = 0;
1165
1166         buffer_init(&m);
1167
1168         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1169         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1170                                   &m);
1171
1172         authenticated = buffer_get_int(&m);
1173
1174         buffer_free(&m);
1175         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1176         return (authenticated);
1177 }
1178 #endif /* GSSAPI */