monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.48 2006/07/22 20:48:23 stevesk 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
  32 #include <openssl/bn.h>
  33 #include <openssl/dh.h>
  34
  35 #include <errno.h>
  36 #include <pwd.h>
  37 #include <string.h>
  38
  39 #include "ssh.h"
  40 #include "dh.h"
  41 #include "kex.h"
  42 #include "auth.h"
  43 #include "auth-options.h"
  44 #include "buffer.h"
  45 #include "bufaux.h"
  46 #include "packet.h"
  47 #include "mac.h"
  48 #include "log.h"
  49 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  50 #undef TARGET_OS_MAC
  51 #include "zlib.h"
  52 #define TARGET_OS_MAC 1
  53 #else
  54 #include "zlib.h"
  55 #endif
  56 #include "monitor.h"
  57 #include "monitor_wrap.h"
  58 #include "xmalloc.h"
  59 #include "atomicio.h"
  60 #include "monitor_fdpass.h"
  61 #include "misc.h"
  62 #include "servconf.h"
  63
  64 #include "auth.h"
  65 #include "channels.h"
  66 #include "session.h"
  67
  68 #ifdef GSSAPI
  69 #include "ssh-gss.h"
  70 #endif
  71
  72 /* Imports */
  73 extern int compat20;
  74 extern Newkeys *newkeys[];
  75 extern z_stream incoming_stream;
  76 extern z_stream outgoing_stream;
  77 extern struct monitor *pmonitor;
  78 extern Buffer input, output;
  79 extern Buffer loginmsg;
  80 extern ServerOptions options;
  81
  82 int
  83 mm_is_monitor(void)
  84 {
  85         /*
  86          * m_pid is only set in the privileged part, and
  87          * points to the unprivileged child.
  88          */
  89         return (pmonitor && pmonitor->m_pid > 0);
  90 }
  91
  92 void
  93 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
  94 {
  95         u_int mlen = buffer_len(m);
  96         u_char buf[5];
  97
  98         debug3("%s entering: type %d", __func__, type);
  99
 100         put_u32(buf, mlen + 1);
 101         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 102         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 103                 fatal("%s: write: %s", __func__, strerror(errno));
 104         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 105                 fatal("%s: write: %s", __func__, strerror(errno));
 106 }
 107
 108 void
 109 mm_request_receive(int sock, Buffer *m)
 110 {
 111         u_char buf[4];
 112         u_int msg_len;
 113
 114         debug3("%s entering", __func__);
 115
 116         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 117                 if (errno == EPIPE)
 118                         cleanup_exit(255);
 119                 fatal("%s: read: %s", __func__, strerror(errno));
 120         }
 121         msg_len = get_u32(buf);
 122         if (msg_len > 256 * 1024)
 123                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 124         buffer_clear(m);
 125         buffer_append_space(m, msg_len);
 126         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 127                 fatal("%s: read: %s", __func__, strerror(errno));
 128 }
 129
 130 void
 131 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 132 {
 133         u_char rtype;
 134
 135         debug3("%s entering: type %d", __func__, type);
 136
 137         mm_request_receive(sock, m);
 138         rtype = buffer_get_char(m);
 139         if (rtype != type)
 140                 fatal("%s: read: rtype %d != type %d", __func__,
 141                     rtype, type);
 142 }
 143
 144 DH *
 145 mm_choose_dh(int min, int nbits, int max)
 146 {
 147         BIGNUM *p, *g;
 148         int success = 0;
 149         Buffer m;
 150
 151         buffer_init(&m);
 152         buffer_put_int(&m, min);
 153         buffer_put_int(&m, nbits);
 154         buffer_put_int(&m, max);
 155
 156         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 157
 158         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 159         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 160
 161         success = buffer_get_char(&m);
 162         if (success == 0)
 163                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 164
 165         if ((p = BN_new()) == NULL)
 166                 fatal("%s: BN_new failed", __func__);
 167         if ((g = BN_new()) == NULL)
 168                 fatal("%s: BN_new failed", __func__);
 169         buffer_get_bignum2(&m, p);
 170         buffer_get_bignum2(&m, g);
 171
 172         debug3("%s: remaining %d", __func__, buffer_len(&m));
 173         buffer_free(&m);
 174
 175         return (dh_new_group(g, p));
 176 }
 177
 178 int
 179 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 180 {
 181         Kex *kex = *pmonitor->m_pkex;
 182         Buffer m;
 183
 184         debug3("%s entering", __func__);
 185
 186         buffer_init(&m);
 187         buffer_put_int(&m, kex->host_key_index(key));
 188         buffer_put_string(&m, data, datalen);
 189
 190         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 191
 192         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 193         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 194         *sigp  = buffer_get_string(&m, lenp);
 195         buffer_free(&m);
 196
 197         return (0);
 198 }
 199
 200 struct passwd *
 201 mm_getpwnamallow(const char *username)
 202 {
 203         Buffer m;
 204         struct passwd *pw;
 205         u_int pwlen;
 206
 207         debug3("%s entering", __func__);
 208
 209         buffer_init(&m);
 210         buffer_put_cstring(&m, username);
 211
 212         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 213
 214         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 215         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 216
 217         if (buffer_get_char(&m) == 0) {
 218                 buffer_free(&m);
 219                 return (NULL);
 220         }
 221         pw = buffer_get_string(&m, &pwlen);
 222         if (pwlen != sizeof(struct passwd))
 223                 fatal("%s: struct passwd size mismatch", __func__);
 224         pw->pw_name = buffer_get_string(&m, NULL);
 225         pw->pw_passwd = buffer_get_string(&m, NULL);
 226         pw->pw_gecos = buffer_get_string(&m, NULL);
 227 #ifdef HAVE_PW_CLASS_IN_PASSWD
 228         pw->pw_class = buffer_get_string(&m, NULL);
 229 #endif
 230         pw->pw_dir = buffer_get_string(&m, NULL);
 231         pw->pw_shell = buffer_get_string(&m, NULL);
 232         buffer_free(&m);
 233
 234         return (pw);
 235 }
 236
 237 char *
 238 mm_auth2_read_banner(void)
 239 {
 240         Buffer m;
 241         char *banner;
 242
 243         debug3("%s entering", __func__);
 244
 245         buffer_init(&m);
 246         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 247         buffer_clear(&m);
 248
 249         mm_request_receive_expect(pmonitor->m_recvfd,
 250             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 251         banner = buffer_get_string(&m, NULL);
 252         buffer_free(&m);
 253
 254         /* treat empty banner as missing banner */
 255         if (strlen(banner) == 0) {
 256                 xfree(banner);
 257                 banner = NULL;
 258         }
 259         return (banner);
 260 }
 261
 262 /* Inform the privileged process about service and style */
 263
 264 void
 265 mm_inform_authserv(char *service, char *style)
 266 {
 267         Buffer m;
 268
 269         debug3("%s entering", __func__);
 270
 271         buffer_init(&m);
 272         buffer_put_cstring(&m, service);
 273         buffer_put_cstring(&m, style ? style : "");
 274
 275         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 276
 277         buffer_free(&m);
 278 }
 279
 280 /* Do the password authentication */
 281 int
 282 mm_auth_password(Authctxt *authctxt, char *password)
 283 {
 284         Buffer m;
 285         int authenticated = 0;
 286
 287         debug3("%s entering", __func__);
 288
 289         buffer_init(&m);
 290         buffer_put_cstring(&m, password);
 291         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 292
 293         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 294         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 295
 296         authenticated = buffer_get_int(&m);
 297
 298         buffer_free(&m);
 299
 300         debug3("%s: user %sauthenticated",
 301             __func__, authenticated ? "" : "not ");
 302         return (authenticated);
 303 }
 304
 305 int
 306 mm_user_key_allowed(struct passwd *pw, Key *key)
 307 {
 308         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 309 }
 310
 311 int
 312 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 313     Key *key)
 314 {
 315         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 316 }
 317
 318 int
 319 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 320     char *host, Key *key)
 321 {
 322         int ret;
 323
 324         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 325         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 326         key->type = KEY_RSA1;
 327         return (ret);
 328 }
 329
 330 static void
 331 mm_send_debug(Buffer *m)
 332 {
 333         char *msg;
 334
 335         while (buffer_len(m)) {
 336                 msg = buffer_get_string(m, NULL);
 337                 debug3("%s: Sending debug: %s", __func__, msg);
 338                 packet_send_debug("%s", msg);
 339                 xfree(msg);
 340         }
 341 }
 342
 343 int
 344 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 345 {
 346         Buffer m;
 347         u_char *blob;
 348         u_int len;
 349         int allowed = 0, have_forced = 0;
 350
 351         debug3("%s entering", __func__);
 352
 353         /* Convert the key to a blob and the pass it over */
 354         if (!key_to_blob(key, &blob, &len))
 355                 return (0);
 356
 357         buffer_init(&m);
 358         buffer_put_int(&m, type);
 359         buffer_put_cstring(&m, user ? user : "");
 360         buffer_put_cstring(&m, host ? host : "");
 361         buffer_put_string(&m, blob, len);
 362         xfree(blob);
 363
 364         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 365
 366         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 367         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 368
 369         allowed = buffer_get_int(&m);
 370
 371         /* fake forced command */
 372         auth_clear_options();
 373         have_forced = buffer_get_int(&m);
 374         forced_command = have_forced ? xstrdup("true") : NULL;
 375
 376         /* Send potential debug messages */
 377         mm_send_debug(&m);
 378
 379         buffer_free(&m);
 380
 381         return (allowed);
 382 }
 383
 384 /*
 385  * This key verify needs to send the key type along, because the
 386  * privileged parent makes the decision if the key is allowed
 387  * for authentication.
 388  */
 389
 390 int
 391 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 392 {
 393         Buffer m;
 394         u_char *blob;
 395         u_int len;
 396         int verified = 0;
 397
 398         debug3("%s entering", __func__);
 399
 400         /* Convert the key to a blob and the pass it over */
 401         if (!key_to_blob(key, &blob, &len))
 402                 return (0);
 403
 404         buffer_init(&m);
 405         buffer_put_string(&m, blob, len);
 406         buffer_put_string(&m, sig, siglen);
 407         buffer_put_string(&m, data, datalen);
 408         xfree(blob);
 409
 410         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 411
 412         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 413         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 414
 415         verified = buffer_get_int(&m);
 416
 417         buffer_free(&m);
 418
 419         return (verified);
 420 }
 421
 422 /* Export key state after authentication */
 423 Newkeys *
 424 mm_newkeys_from_blob(u_char *blob, int blen)
 425 {
 426         Buffer b;
 427         u_int len;
 428         Newkeys *newkey = NULL;
 429         Enc *enc;
 430         Mac *mac;
 431         Comp *comp;
 432
 433         debug3("%s: %p(%d)", __func__, blob, blen);
 434 #ifdef DEBUG_PK
 435         dump_base64(stderr, blob, blen);
 436 #endif
 437         buffer_init(&b);
 438         buffer_append(&b, blob, blen);
 439
 440         newkey = xmalloc(sizeof(*newkey));
 441         enc = &newkey->enc;
 442         mac = &newkey->mac;
 443         comp = &newkey->comp;
 444
 445         /* Enc structure */
 446         enc->name = buffer_get_string(&b, NULL);
 447         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 448         enc->enabled = buffer_get_int(&b);
 449         enc->block_size = buffer_get_int(&b);
 450         enc->key = buffer_get_string(&b, &enc->key_len);
 451         enc->iv = buffer_get_string(&b, &len);
 452         if (len != enc->block_size)
 453                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 454                     enc->block_size, len);
 455
 456         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 457                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 458                     enc->name, enc->cipher);
 459
 460         /* Mac structure */
 461         mac->name = buffer_get_string(&b, NULL);
 462         if (mac->name == NULL || mac_init(mac, mac->name) == -1)
 463                 fatal("%s: can not init mac %s", __func__, mac->name);
 464         mac->enabled = buffer_get_int(&b);
 465         mac->key = buffer_get_string(&b, &len);
 466         if (len > mac->key_len)
 467                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 468                     mac->key_len);
 469         mac->key_len = len;
 470
 471         /* Comp structure */
 472         comp->type = buffer_get_int(&b);
 473         comp->enabled = buffer_get_int(&b);
 474         comp->name = buffer_get_string(&b, NULL);
 475
 476         len = buffer_len(&b);
 477         if (len != 0)
 478                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 479         buffer_free(&b);
 480         return (newkey);
 481 }
 482
 483 int
 484 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 485 {
 486         Buffer b;
 487         int len;
 488         Enc *enc;
 489         Mac *mac;
 490         Comp *comp;
 491         Newkeys *newkey = newkeys[mode];
 492
 493         debug3("%s: converting %p", __func__, newkey);
 494
 495         if (newkey == NULL) {
 496                 error("%s: newkey == NULL", __func__);
 497                 return 0;
 498         }
 499         enc = &newkey->enc;
 500         mac = &newkey->mac;
 501         comp = &newkey->comp;
 502
 503         buffer_init(&b);
 504         /* Enc structure */
 505         buffer_put_cstring(&b, enc->name);
 506         /* The cipher struct is constant and shared, you export pointer */
 507         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 508         buffer_put_int(&b, enc->enabled);
 509         buffer_put_int(&b, enc->block_size);
 510         buffer_put_string(&b, enc->key, enc->key_len);
 511         packet_get_keyiv(mode, enc->iv, enc->block_size);
 512         buffer_put_string(&b, enc->iv, enc->block_size);
 513
 514         /* Mac structure */
 515         buffer_put_cstring(&b, mac->name);
 516         buffer_put_int(&b, mac->enabled);
 517         buffer_put_string(&b, mac->key, mac->key_len);
 518
 519         /* Comp structure */
 520         buffer_put_int(&b, comp->type);
 521         buffer_put_int(&b, comp->enabled);
 522         buffer_put_cstring(&b, comp->name);
 523
 524         len = buffer_len(&b);
 525         if (lenp != NULL)
 526                 *lenp = len;
 527         if (blobp != NULL) {
 528                 *blobp = xmalloc(len);
 529                 memcpy(*blobp, buffer_ptr(&b), len);
 530         }
 531         memset(buffer_ptr(&b), 0, len);
 532         buffer_free(&b);
 533         return len;
 534 }
 535
 536 static void
 537 mm_send_kex(Buffer *m, Kex *kex)
 538 {
 539         buffer_put_string(m, kex->session_id, kex->session_id_len);
 540         buffer_put_int(m, kex->we_need);
 541         buffer_put_int(m, kex->hostkey_type);
 542         buffer_put_int(m, kex->kex_type);
 543         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 544         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 545         buffer_put_int(m, kex->flags);
 546         buffer_put_cstring(m, kex->client_version_string);
 547         buffer_put_cstring(m, kex->server_version_string);
 548 }
 549
 550 void
 551 mm_send_keystate(struct monitor *monitor)
 552 {
 553         Buffer m;
 554         u_char *blob, *p;
 555         u_int bloblen, plen;
 556         u_int32_t seqnr, packets;
 557         u_int64_t blocks;
 558
 559         buffer_init(&m);
 560
 561         if (!compat20) {
 562                 u_char iv[24];
 563                 u_char *key;
 564                 u_int ivlen, keylen;
 565
 566                 buffer_put_int(&m, packet_get_protocol_flags());
 567
 568                 buffer_put_int(&m, packet_get_ssh1_cipher());
 569
 570                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 571                 keylen = packet_get_encryption_key(NULL);
 572                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 573                 keylen = packet_get_encryption_key(key);
 574                 buffer_put_string(&m, key, keylen);
 575                 memset(key, 0, keylen);
 576                 xfree(key);
 577
 578                 ivlen = packet_get_keyiv_len(MODE_OUT);
 579                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 580                 buffer_put_string(&m, iv, ivlen);
 581                 ivlen = packet_get_keyiv_len(MODE_OUT);
 582                 packet_get_keyiv(MODE_IN, iv, ivlen);
 583                 buffer_put_string(&m, iv, ivlen);
 584                 goto skip;
 585         } else {
 586                 /* Kex for rekeying */
 587                 mm_send_kex(&m, *monitor->m_pkex);
 588         }
 589
 590         debug3("%s: Sending new keys: %p %p",
 591             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 592
 593         /* Keys from Kex */
 594         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 595                 fatal("%s: conversion of newkeys failed", __func__);
 596
 597         buffer_put_string(&m, blob, bloblen);
 598         xfree(blob);
 599
 600         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 601                 fatal("%s: conversion of newkeys failed", __func__);
 602
 603         buffer_put_string(&m, blob, bloblen);
 604         xfree(blob);
 605
 606         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
 607         buffer_put_int(&m, seqnr);
 608         buffer_put_int64(&m, blocks);
 609         buffer_put_int(&m, packets);
 610         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 611         buffer_put_int(&m, seqnr);
 612         buffer_put_int64(&m, blocks);
 613         buffer_put_int(&m, packets);
 614
 615         debug3("%s: New keys have been sent", __func__);
 616  skip:
 617         /* More key context */
 618         plen = packet_get_keycontext(MODE_OUT, NULL);
 619         p = xmalloc(plen+1);
 620         packet_get_keycontext(MODE_OUT, p);
 621         buffer_put_string(&m, p, plen);
 622         xfree(p);
 623
 624         plen = packet_get_keycontext(MODE_IN, NULL);
 625         p = xmalloc(plen+1);
 626         packet_get_keycontext(MODE_IN, p);
 627         buffer_put_string(&m, p, plen);
 628         xfree(p);
 629
 630         /* Compression state */
 631         debug3("%s: Sending compression state", __func__);
 632         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 633         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 634
 635         /* Network I/O buffers */
 636         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 637         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 638
 639         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 640         debug3("%s: Finished sending state", __func__);
 641
 642         buffer_free(&m);
 643 }
 644
 645 int
 646 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 647 {
 648         Buffer m;
 649         char *p, *msg;
 650         int success = 0;
 651
 652         buffer_init(&m);
 653         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 654
 655         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 656         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 657
 658         success = buffer_get_int(&m);
 659         if (success == 0) {
 660                 debug3("%s: pty alloc failed", __func__);
 661                 buffer_free(&m);
 662                 return (0);
 663         }
 664         p = buffer_get_string(&m, NULL);
 665         msg = buffer_get_string(&m, NULL);
 666         buffer_free(&m);
 667
 668         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 669         xfree(p);
 670
 671         buffer_append(&loginmsg, msg, strlen(msg));
 672         xfree(msg);
 673
 674         *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
 675         *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
 676
 677         /* Success */
 678         return (1);
 679 }
 680
 681 void
 682 mm_session_pty_cleanup2(Session *s)
 683 {
 684         Buffer m;
 685
 686         if (s->ttyfd == -1)
 687                 return;
 688         buffer_init(&m);
 689         buffer_put_cstring(&m, s->tty);
 690         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 691         buffer_free(&m);
 692
 693         /* closed dup'ed master */
 694         if (close(s->ptymaster) < 0)
 695                 error("close(s->ptymaster): %s", strerror(errno));
 696
 697         /* unlink pty from session */
 698         s->ttyfd = -1;
 699 }
 700
 701 #ifdef USE_PAM
 702 void
 703 mm_start_pam(Authctxt *authctxt)
 704 {
 705         Buffer m;
 706
 707         debug3("%s entering", __func__);
 708         if (!options.use_pam)
 709                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 710
 711         buffer_init(&m);
 712         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 713
 714         buffer_free(&m);
 715 }
 716
 717 u_int
 718 mm_do_pam_account(void)
 719 {
 720         Buffer m;
 721         u_int ret;
 722         char *msg;
 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_ACCOUNT, &m);
 730
 731         mm_request_receive_expect(pmonitor->m_recvfd,
 732             MONITOR_ANS_PAM_ACCOUNT, &m);
 733         ret = buffer_get_int(&m);
 734         msg = buffer_get_string(&m, NULL);
 735         buffer_append(&loginmsg, msg, strlen(msg));
 736         xfree(msg);
 737
 738         buffer_free(&m);
 739
 740         debug3("%s returning %d", __func__, ret);
 741
 742         return (ret);
 743 }
 744
 745 void *
 746 mm_sshpam_init_ctx(Authctxt *authctxt)
 747 {
 748         Buffer m;
 749         int success;
 750
 751         debug3("%s", __func__);
 752         buffer_init(&m);
 753         buffer_put_cstring(&m, authctxt->user);
 754         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 755         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 756         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 757         success = buffer_get_int(&m);
 758         if (success == 0) {
 759                 debug3("%s: pam_init_ctx failed", __func__);
 760                 buffer_free(&m);
 761                 return (NULL);
 762         }
 763         buffer_free(&m);
 764         return (authctxt);
 765 }
 766
 767 int
 768 mm_sshpam_query(void *ctx, char **name, char **info,
 769     u_int *num, char ***prompts, u_int **echo_on)
 770 {
 771         Buffer m;
 772         u_int i;
 773         int ret;
 774
 775         debug3("%s", __func__);
 776         buffer_init(&m);
 777         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 778         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 779         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 780         ret = buffer_get_int(&m);
 781         debug3("%s: pam_query returned %d", __func__, ret);
 782         *name = buffer_get_string(&m, NULL);
 783         *info = buffer_get_string(&m, NULL);
 784         *num = buffer_get_int(&m);
 785         if (*num > PAM_MAX_NUM_MSG)
 786                 fatal("%s: recieved %u PAM messages, expected <= %u",
 787                     __func__, *num, PAM_MAX_NUM_MSG);
 788         *prompts = xcalloc((*num + 1), sizeof(char *));
 789         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 790         for (i = 0; i < *num; ++i) {
 791                 (*prompts)[i] = buffer_get_string(&m, NULL);
 792                 (*echo_on)[i] = buffer_get_int(&m);
 793         }
 794         buffer_free(&m);
 795         return (ret);
 796 }
 797
 798 int
 799 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 800 {
 801         Buffer m;
 802         u_int i;
 803         int ret;
 804
 805         debug3("%s", __func__);
 806         buffer_init(&m);
 807         buffer_put_int(&m, num);
 808         for (i = 0; i < num; ++i)
 809                 buffer_put_cstring(&m, resp[i]);
 810         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 811         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 812         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 813         ret = buffer_get_int(&m);
 814         debug3("%s: pam_respond returned %d", __func__, ret);
 815         buffer_free(&m);
 816         return (ret);
 817 }
 818
 819 void
 820 mm_sshpam_free_ctx(void *ctxtp)
 821 {
 822         Buffer m;
 823
 824         debug3("%s", __func__);
 825         buffer_init(&m);
 826         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 827         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 828         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 829         buffer_free(&m);
 830 }
 831 #endif /* USE_PAM */
 832
 833 /* Request process termination */
 834
 835 void
 836 mm_terminate(void)
 837 {
 838         Buffer m;
 839
 840         buffer_init(&m);
 841         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 842         buffer_free(&m);
 843 }
 844
 845 int
 846 mm_ssh1_session_key(BIGNUM *num)
 847 {
 848         int rsafail;
 849         Buffer m;
 850
 851         buffer_init(&m);
 852         buffer_put_bignum2(&m, num);
 853         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 854
 855         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 856
 857         rsafail = buffer_get_int(&m);
 858         buffer_get_bignum2(&m, num);
 859
 860         buffer_free(&m);
 861
 862         return (rsafail);
 863 }
 864
 865 static void
 866 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 867     char ***prompts, u_int **echo_on)
 868 {
 869         *name = xstrdup("");
 870         *infotxt = xstrdup("");
 871         *numprompts = 1;
 872         *prompts = xcalloc(*numprompts, sizeof(char *));
 873         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 874         (*echo_on)[0] = 0;
 875 }
 876
 877 int
 878 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 879    u_int *numprompts, char ***prompts, u_int **echo_on)
 880 {
 881         Buffer m;
 882         u_int success;
 883         char *challenge;
 884
 885         debug3("%s: entering", __func__);
 886
 887         buffer_init(&m);
 888         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 889
 890         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 891             &m);
 892         success = buffer_get_int(&m);
 893         if (success == 0) {
 894                 debug3("%s: no challenge", __func__);
 895                 buffer_free(&m);
 896                 return (-1);
 897         }
 898
 899         /* Get the challenge, and format the response */
 900         challenge  = buffer_get_string(&m, NULL);
 901         buffer_free(&m);
 902
 903         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 904         (*prompts)[0] = challenge;
 905
 906         debug3("%s: received challenge: %s", __func__, challenge);
 907
 908         return (0);
 909 }
 910
 911 int
 912 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 913 {
 914         Buffer m;
 915         int authok;
 916
 917         debug3("%s: entering", __func__);
 918         if (numresponses != 1)
 919                 return (-1);
 920
 921         buffer_init(&m);
 922         buffer_put_cstring(&m, responses[0]);
 923         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 924
 925         mm_request_receive_expect(pmonitor->m_recvfd,
 926             MONITOR_ANS_BSDAUTHRESPOND, &m);
 927
 928         authok = buffer_get_int(&m);
 929         buffer_free(&m);
 930
 931         return ((authok == 0) ? -1 : 0);
 932 }
 933
 934 #ifdef SKEY
 935 int
 936 mm_skey_query(void *ctx, char **name, char **infotxt,
 937    u_int *numprompts, char ***prompts, u_int **echo_on)
 938 {
 939         Buffer m;
 940         int len;
 941         u_int success;
 942         char *p, *challenge;
 943
 944         debug3("%s: entering", __func__);
 945
 946         buffer_init(&m);
 947         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 948
 949         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 950             &m);
 951         success = buffer_get_int(&m);
 952         if (success == 0) {
 953                 debug3("%s: no challenge", __func__);
 954                 buffer_free(&m);
 955                 return (-1);
 956         }
 957
 958         /* Get the challenge, and format the response */
 959         challenge  = buffer_get_string(&m, NULL);
 960         buffer_free(&m);
 961
 962         debug3("%s: received challenge: %s", __func__, challenge);
 963
 964         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 965
 966         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
 967         xfree(challenge);
 968
 969         return (0);
 970 }
 971
 972 int
 973 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 974 {
 975         Buffer m;
 976         int authok;
 977
 978         debug3("%s: entering", __func__);
 979         if (numresponses != 1)
 980                 return (-1);
 981
 982         buffer_init(&m);
 983         buffer_put_cstring(&m, responses[0]);
 984         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
 985
 986         mm_request_receive_expect(pmonitor->m_recvfd,
 987             MONITOR_ANS_SKEYRESPOND, &m);
 988
 989         authok = buffer_get_int(&m);
 990         buffer_free(&m);
 991
 992         return ((authok == 0) ? -1 : 0);
 993 }
 994 #endif /* SKEY */
 995
 996 void
 997 mm_ssh1_session_id(u_char session_id[16])
 998 {
 999         Buffer m;
1000         int i;
1001
1002         debug3("%s entering", __func__);
1003
1004         buffer_init(&m);
1005         for (i = 0; i < 16; i++)
1006                 buffer_put_char(&m, session_id[i]);
1007
1008         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1009         buffer_free(&m);
1010 }
1011
1012 int
1013 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1014 {
1015         Buffer m;
1016         Key *key;
1017         u_char *blob;
1018         u_int blen;
1019         int allowed = 0, have_forced = 0;
1020
1021         debug3("%s entering", __func__);
1022
1023         buffer_init(&m);
1024         buffer_put_bignum2(&m, client_n);
1025
1026         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1027         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1028
1029         allowed = buffer_get_int(&m);
1030
1031         /* fake forced command */
1032         auth_clear_options();
1033         have_forced = buffer_get_int(&m);
1034         forced_command = have_forced ? xstrdup("true") : NULL;
1035
1036         if (allowed && rkey != NULL) {
1037                 blob = buffer_get_string(&m, &blen);
1038                 if ((key = key_from_blob(blob, blen)) == NULL)
1039                         fatal("%s: key_from_blob failed", __func__);
1040                 *rkey = key;
1041                 xfree(blob);
1042         }
1043         mm_send_debug(&m);
1044         buffer_free(&m);
1045
1046         return (allowed);
1047 }
1048
1049 BIGNUM *
1050 mm_auth_rsa_generate_challenge(Key *key)
1051 {
1052         Buffer m;
1053         BIGNUM *challenge;
1054         u_char *blob;
1055         u_int blen;
1056
1057         debug3("%s entering", __func__);
1058
1059         if ((challenge = BN_new()) == NULL)
1060                 fatal("%s: BN_new failed", __func__);
1061
1062         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1063         if (key_to_blob(key, &blob, &blen) == 0)
1064                 fatal("%s: key_to_blob failed", __func__);
1065         key->type = KEY_RSA1;
1066
1067         buffer_init(&m);
1068         buffer_put_string(&m, blob, blen);
1069         xfree(blob);
1070
1071         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1072         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1073
1074         buffer_get_bignum2(&m, challenge);
1075         buffer_free(&m);
1076
1077         return (challenge);
1078 }
1079
1080 int
1081 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1082 {
1083         Buffer m;
1084         u_char *blob;
1085         u_int blen;
1086         int success = 0;
1087
1088         debug3("%s entering", __func__);
1089
1090         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1091         if (key_to_blob(key, &blob, &blen) == 0)
1092                 fatal("%s: key_to_blob failed", __func__);
1093         key->type = KEY_RSA1;
1094
1095         buffer_init(&m);
1096         buffer_put_string(&m, blob, blen);
1097         buffer_put_string(&m, response, 16);
1098         xfree(blob);
1099
1100         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1101         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1102
1103         success = buffer_get_int(&m);
1104         buffer_free(&m);
1105
1106         return (success);
1107 }
1108
1109 #ifdef SSH_AUDIT_EVENTS
1110 void
1111 mm_audit_event(ssh_audit_event_t event)
1112 {
1113         Buffer m;
1114
1115         debug3("%s entering", __func__);
1116
1117         buffer_init(&m);
1118         buffer_put_int(&m, event);
1119
1120         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1121         buffer_free(&m);
1122 }
1123
1124 void
1125 mm_audit_run_command(const char *command)
1126 {
1127         Buffer m;
1128
1129         debug3("%s entering command %s", __func__, command);
1130
1131         buffer_init(&m);
1132         buffer_put_cstring(&m, command);
1133
1134         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1135         buffer_free(&m);
1136 }
1137 #endif /* SSH_AUDIT_EVENTS */
1138
1139 #ifdef GSSAPI
1140 OM_uint32
1141 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1142 {
1143         Buffer m;
1144         OM_uint32 major;
1145
1146         /* Client doesn't get to see the context */
1147         *ctx = NULL;
1148
1149         buffer_init(&m);
1150         buffer_put_string(&m, goid->elements, goid->length);
1151
1152         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1153         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1154
1155         major = buffer_get_int(&m);
1156
1157         buffer_free(&m);
1158         return (major);
1159 }
1160
1161 OM_uint32
1162 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1163     gss_buffer_desc *out, OM_uint32 *flags)
1164 {
1165         Buffer m;
1166         OM_uint32 major;
1167         u_int len;
1168
1169         buffer_init(&m);
1170         buffer_put_string(&m, in->value, in->length);
1171
1172         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1173         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1174
1175         major = buffer_get_int(&m);
1176         out->value = buffer_get_string(&m, &len);
1177         out->length = len;
1178         if (flags)
1179                 *flags = buffer_get_int(&m);
1180
1181         buffer_free(&m);
1182
1183         return (major);
1184 }
1185
1186 OM_uint32
1187 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1188 {
1189         Buffer m;
1190         OM_uint32 major;
1191
1192         buffer_init(&m);
1193         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1194         buffer_put_string(&m, gssmic->value, gssmic->length);
1195
1196         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1197         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1198             &m);
1199
1200         major = buffer_get_int(&m);
1201         buffer_free(&m);
1202         return(major);
1203 }
1204
1205 int
1206 mm_ssh_gssapi_userok(char *user)
1207 {
1208         Buffer m;
1209         int authenticated = 0;
1210
1211         buffer_init(&m);
1212
1213         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1214         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1215                                   &m);
1216
1217         authenticated = buffer_get_int(&m);
1218
1219         buffer_free(&m);
1220         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1221         return (authenticated);
1222 }
1223 #endif /* GSSAPI */