monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.49 2006/08/01 23:22:47 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 <stdio.h>
  38 #include <string.h>
  39
  40 #include "ssh.h"
  41 #include "dh.h"
  42 #include "kex.h"
  43 #include "auth.h"
  44 #include "auth-options.h"
  45 #include "buffer.h"
  46 #include "bufaux.h"
  47 #include "packet.h"
  48 #include "mac.h"
  49 #include "log.h"
  50 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  51 #undef TARGET_OS_MAC
  52 #include "zlib.h"
  53 #define TARGET_OS_MAC 1
  54 #else
  55 #include "zlib.h"
  56 #endif
  57 #include "monitor.h"
  58 #include "monitor_wrap.h"
  59 #include "xmalloc.h"
  60 #include "atomicio.h"
  61 #include "monitor_fdpass.h"
  62 #include "misc.h"
  63 #include "servconf.h"
  64
  65 #include "auth.h"
  66 #include "channels.h"
  67 #include "session.h"
  68
  69 #ifdef GSSAPI
  70 #include "ssh-gss.h"
  71 #endif
  72
  73 /* Imports */
  74 extern int compat20;
  75 extern Newkeys *newkeys[];
  76 extern z_stream incoming_stream;
  77 extern z_stream outgoing_stream;
  78 extern struct monitor *pmonitor;
  79 extern Buffer input, output;
  80 extern Buffer loginmsg;
  81 extern ServerOptions options;
  82
  83 int
  84 mm_is_monitor(void)
  85 {
  86         /*
  87          * m_pid is only set in the privileged part, and
  88          * points to the unprivileged child.
  89          */
  90         return (pmonitor && pmonitor->m_pid > 0);
  91 }
  92
  93 void
  94 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
  95 {
  96         u_int mlen = buffer_len(m);
  97         u_char buf[5];
  98
  99         debug3("%s entering: type %d", __func__, type);
 100
 101         put_u32(buf, mlen + 1);
 102         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 103         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 104                 fatal("%s: write: %s", __func__, strerror(errno));
 105         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 106                 fatal("%s: write: %s", __func__, strerror(errno));
 107 }
 108
 109 void
 110 mm_request_receive(int sock, Buffer *m)
 111 {
 112         u_char buf[4];
 113         u_int msg_len;
 114
 115         debug3("%s entering", __func__);
 116
 117         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 118                 if (errno == EPIPE)
 119                         cleanup_exit(255);
 120                 fatal("%s: read: %s", __func__, strerror(errno));
 121         }
 122         msg_len = get_u32(buf);
 123         if (msg_len > 256 * 1024)
 124                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 125         buffer_clear(m);
 126         buffer_append_space(m, msg_len);
 127         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 128                 fatal("%s: read: %s", __func__, strerror(errno));
 129 }
 130
 131 void
 132 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 133 {
 134         u_char rtype;
 135
 136         debug3("%s entering: type %d", __func__, type);
 137
 138         mm_request_receive(sock, m);
 139         rtype = buffer_get_char(m);
 140         if (rtype != type)
 141                 fatal("%s: read: rtype %d != type %d", __func__,
 142                     rtype, type);
 143 }
 144
 145 DH *
 146 mm_choose_dh(int min, int nbits, int max)
 147 {
 148         BIGNUM *p, *g;
 149         int success = 0;
 150         Buffer m;
 151
 152         buffer_init(&m);
 153         buffer_put_int(&m, min);
 154         buffer_put_int(&m, nbits);
 155         buffer_put_int(&m, max);
 156
 157         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 158
 159         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 160         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 161
 162         success = buffer_get_char(&m);
 163         if (success == 0)
 164                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 165
 166         if ((p = BN_new()) == NULL)
 167                 fatal("%s: BN_new failed", __func__);
 168         if ((g = BN_new()) == NULL)
 169                 fatal("%s: BN_new failed", __func__);
 170         buffer_get_bignum2(&m, p);
 171         buffer_get_bignum2(&m, g);
 172
 173         debug3("%s: remaining %d", __func__, buffer_len(&m));
 174         buffer_free(&m);
 175
 176         return (dh_new_group(g, p));
 177 }
 178
 179 int
 180 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 181 {
 182         Kex *kex = *pmonitor->m_pkex;
 183         Buffer m;
 184
 185         debug3("%s entering", __func__);
 186
 187         buffer_init(&m);
 188         buffer_put_int(&m, kex->host_key_index(key));
 189         buffer_put_string(&m, data, datalen);
 190
 191         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 192
 193         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 194         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 195         *sigp  = buffer_get_string(&m, lenp);
 196         buffer_free(&m);
 197
 198         return (0);
 199 }
 200
 201 struct passwd *
 202 mm_getpwnamallow(const char *username)
 203 {
 204         Buffer m;
 205         struct passwd *pw;
 206         u_int pwlen;
 207
 208         debug3("%s entering", __func__);
 209
 210         buffer_init(&m);
 211         buffer_put_cstring(&m, username);
 212
 213         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 214
 215         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 216         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 217
 218         if (buffer_get_char(&m) == 0) {
 219                 buffer_free(&m);
 220                 return (NULL);
 221         }
 222         pw = buffer_get_string(&m, &pwlen);
 223         if (pwlen != sizeof(struct passwd))
 224                 fatal("%s: struct passwd size mismatch", __func__);
 225         pw->pw_name = buffer_get_string(&m, NULL);
 226         pw->pw_passwd = buffer_get_string(&m, NULL);
 227         pw->pw_gecos = buffer_get_string(&m, NULL);
 228 #ifdef HAVE_PW_CLASS_IN_PASSWD
 229         pw->pw_class = buffer_get_string(&m, NULL);
 230 #endif
 231         pw->pw_dir = buffer_get_string(&m, NULL);
 232         pw->pw_shell = buffer_get_string(&m, NULL);
 233         buffer_free(&m);
 234
 235         return (pw);
 236 }
 237
 238 char *
 239 mm_auth2_read_banner(void)
 240 {
 241         Buffer m;
 242         char *banner;
 243
 244         debug3("%s entering", __func__);
 245
 246         buffer_init(&m);
 247         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 248         buffer_clear(&m);
 249
 250         mm_request_receive_expect(pmonitor->m_recvfd,
 251             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 252         banner = buffer_get_string(&m, NULL);
 253         buffer_free(&m);
 254
 255         /* treat empty banner as missing banner */
 256         if (strlen(banner) == 0) {
 257                 xfree(banner);
 258                 banner = NULL;
 259         }
 260         return (banner);
 261 }
 262
 263 /* Inform the privileged process about service and style */
 264
 265 void
 266 mm_inform_authserv(char *service, char *style)
 267 {
 268         Buffer m;
 269
 270         debug3("%s entering", __func__);
 271
 272         buffer_init(&m);
 273         buffer_put_cstring(&m, service);
 274         buffer_put_cstring(&m, style ? style : "");
 275
 276         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 277
 278         buffer_free(&m);
 279 }
 280
 281 /* Do the password authentication */
 282 int
 283 mm_auth_password(Authctxt *authctxt, char *password)
 284 {
 285         Buffer m;
 286         int authenticated = 0;
 287
 288         debug3("%s entering", __func__);
 289
 290         buffer_init(&m);
 291         buffer_put_cstring(&m, password);
 292         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 293
 294         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 295         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 296
 297         authenticated = buffer_get_int(&m);
 298
 299         buffer_free(&m);
 300
 301         debug3("%s: user %sauthenticated",
 302             __func__, authenticated ? "" : "not ");
 303         return (authenticated);
 304 }
 305
 306 int
 307 mm_user_key_allowed(struct passwd *pw, Key *key)
 308 {
 309         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 310 }
 311
 312 int
 313 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 314     Key *key)
 315 {
 316         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 317 }
 318
 319 int
 320 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 321     char *host, Key *key)
 322 {
 323         int ret;
 324
 325         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 326         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 327         key->type = KEY_RSA1;
 328         return (ret);
 329 }
 330
 331 static void
 332 mm_send_debug(Buffer *m)
 333 {
 334         char *msg;
 335
 336         while (buffer_len(m)) {
 337                 msg = buffer_get_string(m, NULL);
 338                 debug3("%s: Sending debug: %s", __func__, msg);
 339                 packet_send_debug("%s", msg);
 340                 xfree(msg);
 341         }
 342 }
 343
 344 int
 345 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 346 {
 347         Buffer m;
 348         u_char *blob;
 349         u_int len;
 350         int allowed = 0, have_forced = 0;
 351
 352         debug3("%s entering", __func__);
 353
 354         /* Convert the key to a blob and the pass it over */
 355         if (!key_to_blob(key, &blob, &len))
 356                 return (0);
 357
 358         buffer_init(&m);
 359         buffer_put_int(&m, type);
 360         buffer_put_cstring(&m, user ? user : "");
 361         buffer_put_cstring(&m, host ? host : "");
 362         buffer_put_string(&m, blob, len);
 363         xfree(blob);
 364
 365         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 366
 367         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 368         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 369
 370         allowed = buffer_get_int(&m);
 371
 372         /* fake forced command */
 373         auth_clear_options();
 374         have_forced = buffer_get_int(&m);
 375         forced_command = have_forced ? xstrdup("true") : NULL;
 376
 377         /* Send potential debug messages */
 378         mm_send_debug(&m);
 379
 380         buffer_free(&m);
 381
 382         return (allowed);
 383 }
 384
 385 /*
 386  * This key verify needs to send the key type along, because the
 387  * privileged parent makes the decision if the key is allowed
 388  * for authentication.
 389  */
 390
 391 int
 392 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 393 {
 394         Buffer m;
 395         u_char *blob;
 396         u_int len;
 397         int verified = 0;
 398
 399         debug3("%s entering", __func__);
 400
 401         /* Convert the key to a blob and the pass it over */
 402         if (!key_to_blob(key, &blob, &len))
 403                 return (0);
 404
 405         buffer_init(&m);
 406         buffer_put_string(&m, blob, len);
 407         buffer_put_string(&m, sig, siglen);
 408         buffer_put_string(&m, data, datalen);
 409         xfree(blob);
 410
 411         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 412
 413         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 414         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 415
 416         verified = buffer_get_int(&m);
 417
 418         buffer_free(&m);
 419
 420         return (verified);
 421 }
 422
 423 /* Export key state after authentication */
 424 Newkeys *
 425 mm_newkeys_from_blob(u_char *blob, int blen)
 426 {
 427         Buffer b;
 428         u_int len;
 429         Newkeys *newkey = NULL;
 430         Enc *enc;
 431         Mac *mac;
 432         Comp *comp;
 433
 434         debug3("%s: %p(%d)", __func__, blob, blen);
 435 #ifdef DEBUG_PK
 436         dump_base64(stderr, blob, blen);
 437 #endif
 438         buffer_init(&b);
 439         buffer_append(&b, blob, blen);
 440
 441         newkey = xmalloc(sizeof(*newkey));
 442         enc = &newkey->enc;
 443         mac = &newkey->mac;
 444         comp = &newkey->comp;
 445
 446         /* Enc structure */
 447         enc->name = buffer_get_string(&b, NULL);
 448         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 449         enc->enabled = buffer_get_int(&b);
 450         enc->block_size = buffer_get_int(&b);
 451         enc->key = buffer_get_string(&b, &enc->key_len);
 452         enc->iv = buffer_get_string(&b, &len);
 453         if (len != enc->block_size)
 454                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 455                     enc->block_size, len);
 456
 457         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 458                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 459                     enc->name, enc->cipher);
 460
 461         /* Mac structure */
 462         mac->name = buffer_get_string(&b, NULL);
 463         if (mac->name == NULL || mac_init(mac, mac->name) == -1)
 464                 fatal("%s: can not init mac %s", __func__, mac->name);
 465         mac->enabled = buffer_get_int(&b);
 466         mac->key = buffer_get_string(&b, &len);
 467         if (len > mac->key_len)
 468                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 469                     mac->key_len);
 470         mac->key_len = len;
 471
 472         /* Comp structure */
 473         comp->type = buffer_get_int(&b);
 474         comp->enabled = buffer_get_int(&b);
 475         comp->name = buffer_get_string(&b, NULL);
 476
 477         len = buffer_len(&b);
 478         if (len != 0)
 479                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 480         buffer_free(&b);
 481         return (newkey);
 482 }
 483
 484 int
 485 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 486 {
 487         Buffer b;
 488         int len;
 489         Enc *enc;
 490         Mac *mac;
 491         Comp *comp;
 492         Newkeys *newkey = newkeys[mode];
 493
 494         debug3("%s: converting %p", __func__, newkey);
 495
 496         if (newkey == NULL) {
 497                 error("%s: newkey == NULL", __func__);
 498                 return 0;
 499         }
 500         enc = &newkey->enc;
 501         mac = &newkey->mac;
 502         comp = &newkey->comp;
 503
 504         buffer_init(&b);
 505         /* Enc structure */
 506         buffer_put_cstring(&b, enc->name);
 507         /* The cipher struct is constant and shared, you export pointer */
 508         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 509         buffer_put_int(&b, enc->enabled);
 510         buffer_put_int(&b, enc->block_size);
 511         buffer_put_string(&b, enc->key, enc->key_len);
 512         packet_get_keyiv(mode, enc->iv, enc->block_size);
 513         buffer_put_string(&b, enc->iv, enc->block_size);
 514
 515         /* Mac structure */
 516         buffer_put_cstring(&b, mac->name);
 517         buffer_put_int(&b, mac->enabled);
 518         buffer_put_string(&b, mac->key, mac->key_len);
 519
 520         /* Comp structure */
 521         buffer_put_int(&b, comp->type);
 522         buffer_put_int(&b, comp->enabled);
 523         buffer_put_cstring(&b, comp->name);
 524
 525         len = buffer_len(&b);
 526         if (lenp != NULL)
 527                 *lenp = len;
 528         if (blobp != NULL) {
 529                 *blobp = xmalloc(len);
 530                 memcpy(*blobp, buffer_ptr(&b), len);
 531         }
 532         memset(buffer_ptr(&b), 0, len);
 533         buffer_free(&b);
 534         return len;
 535 }
 536
 537 static void
 538 mm_send_kex(Buffer *m, Kex *kex)
 539 {
 540         buffer_put_string(m, kex->session_id, kex->session_id_len);
 541         buffer_put_int(m, kex->we_need);
 542         buffer_put_int(m, kex->hostkey_type);
 543         buffer_put_int(m, kex->kex_type);
 544         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 545         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 546         buffer_put_int(m, kex->flags);
 547         buffer_put_cstring(m, kex->client_version_string);
 548         buffer_put_cstring(m, kex->server_version_string);
 549 }
 550
 551 void
 552 mm_send_keystate(struct monitor *monitor)
 553 {
 554         Buffer m;
 555         u_char *blob, *p;
 556         u_int bloblen, plen;
 557         u_int32_t seqnr, packets;
 558         u_int64_t blocks;
 559
 560         buffer_init(&m);
 561
 562         if (!compat20) {
 563                 u_char iv[24];
 564                 u_char *key;
 565                 u_int ivlen, keylen;
 566
 567                 buffer_put_int(&m, packet_get_protocol_flags());
 568
 569                 buffer_put_int(&m, packet_get_ssh1_cipher());
 570
 571                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 572                 keylen = packet_get_encryption_key(NULL);
 573                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 574                 keylen = packet_get_encryption_key(key);
 575                 buffer_put_string(&m, key, keylen);
 576                 memset(key, 0, keylen);
 577                 xfree(key);
 578
 579                 ivlen = packet_get_keyiv_len(MODE_OUT);
 580                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 581                 buffer_put_string(&m, iv, ivlen);
 582                 ivlen = packet_get_keyiv_len(MODE_OUT);
 583                 packet_get_keyiv(MODE_IN, iv, ivlen);
 584                 buffer_put_string(&m, iv, ivlen);
 585                 goto skip;
 586         } else {
 587                 /* Kex for rekeying */
 588                 mm_send_kex(&m, *monitor->m_pkex);
 589         }
 590
 591         debug3("%s: Sending new keys: %p %p",
 592             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 593
 594         /* Keys from Kex */
 595         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 596                 fatal("%s: conversion of newkeys failed", __func__);
 597
 598         buffer_put_string(&m, blob, bloblen);
 599         xfree(blob);
 600
 601         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 602                 fatal("%s: conversion of newkeys failed", __func__);
 603
 604         buffer_put_string(&m, blob, bloblen);
 605         xfree(blob);
 606
 607         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
 608         buffer_put_int(&m, seqnr);
 609         buffer_put_int64(&m, blocks);
 610         buffer_put_int(&m, packets);
 611         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 612         buffer_put_int(&m, seqnr);
 613         buffer_put_int64(&m, blocks);
 614         buffer_put_int(&m, packets);
 615
 616         debug3("%s: New keys have been sent", __func__);
 617  skip:
 618         /* More key context */
 619         plen = packet_get_keycontext(MODE_OUT, NULL);
 620         p = xmalloc(plen+1);
 621         packet_get_keycontext(MODE_OUT, p);
 622         buffer_put_string(&m, p, plen);
 623         xfree(p);
 624
 625         plen = packet_get_keycontext(MODE_IN, NULL);
 626         p = xmalloc(plen+1);
 627         packet_get_keycontext(MODE_IN, p);
 628         buffer_put_string(&m, p, plen);
 629         xfree(p);
 630
 631         /* Compression state */
 632         debug3("%s: Sending compression state", __func__);
 633         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 634         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 635
 636         /* Network I/O buffers */
 637         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 638         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 639
 640         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 641         debug3("%s: Finished sending state", __func__);
 642
 643         buffer_free(&m);
 644 }
 645
 646 int
 647 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 648 {
 649         Buffer m;
 650         char *p, *msg;
 651         int success = 0;
 652
 653         buffer_init(&m);
 654         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 655
 656         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 657         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 658
 659         success = buffer_get_int(&m);
 660         if (success == 0) {
 661                 debug3("%s: pty alloc failed", __func__);
 662                 buffer_free(&m);
 663                 return (0);
 664         }
 665         p = buffer_get_string(&m, NULL);
 666         msg = buffer_get_string(&m, NULL);
 667         buffer_free(&m);
 668
 669         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 670         xfree(p);
 671
 672         buffer_append(&loginmsg, msg, strlen(msg));
 673         xfree(msg);
 674
 675         *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
 676         *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
 677
 678         /* Success */
 679         return (1);
 680 }
 681
 682 void
 683 mm_session_pty_cleanup2(Session *s)
 684 {
 685         Buffer m;
 686
 687         if (s->ttyfd == -1)
 688                 return;
 689         buffer_init(&m);
 690         buffer_put_cstring(&m, s->tty);
 691         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 692         buffer_free(&m);
 693
 694         /* closed dup'ed master */
 695         if (close(s->ptymaster) < 0)
 696                 error("close(s->ptymaster): %s", strerror(errno));
 697
 698         /* unlink pty from session */
 699         s->ttyfd = -1;
 700 }
 701
 702 #ifdef USE_PAM
 703 void
 704 mm_start_pam(Authctxt *authctxt)
 705 {
 706         Buffer m;
 707
 708         debug3("%s entering", __func__);
 709         if (!options.use_pam)
 710                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 711
 712         buffer_init(&m);
 713         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 714
 715         buffer_free(&m);
 716 }
 717
 718 u_int
 719 mm_do_pam_account(void)
 720 {
 721         Buffer m;
 722         u_int ret;
 723         char *msg;
 724
 725         debug3("%s entering", __func__);
 726         if (!options.use_pam)
 727                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 728
 729         buffer_init(&m);
 730         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 731
 732         mm_request_receive_expect(pmonitor->m_recvfd,
 733             MONITOR_ANS_PAM_ACCOUNT, &m);
 734         ret = buffer_get_int(&m);
 735         msg = buffer_get_string(&m, NULL);
 736         buffer_append(&loginmsg, msg, strlen(msg));
 737         xfree(msg);
 738
 739         buffer_free(&m);
 740
 741         debug3("%s returning %d", __func__, ret);
 742
 743         return (ret);
 744 }
 745
 746 void *
 747 mm_sshpam_init_ctx(Authctxt *authctxt)
 748 {
 749         Buffer m;
 750         int success;
 751
 752         debug3("%s", __func__);
 753         buffer_init(&m);
 754         buffer_put_cstring(&m, authctxt->user);
 755         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 756         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 757         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 758         success = buffer_get_int(&m);
 759         if (success == 0) {
 760                 debug3("%s: pam_init_ctx failed", __func__);
 761                 buffer_free(&m);
 762                 return (NULL);
 763         }
 764         buffer_free(&m);
 765         return (authctxt);
 766 }
 767
 768 int
 769 mm_sshpam_query(void *ctx, char **name, char **info,
 770     u_int *num, char ***prompts, u_int **echo_on)
 771 {
 772         Buffer m;
 773         u_int i;
 774         int ret;
 775
 776         debug3("%s", __func__);
 777         buffer_init(&m);
 778         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 779         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 780         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 781         ret = buffer_get_int(&m);
 782         debug3("%s: pam_query returned %d", __func__, ret);
 783         *name = buffer_get_string(&m, NULL);
 784         *info = buffer_get_string(&m, NULL);
 785         *num = buffer_get_int(&m);
 786         if (*num > PAM_MAX_NUM_MSG)
 787                 fatal("%s: recieved %u PAM messages, expected <= %u",
 788                     __func__, *num, PAM_MAX_NUM_MSG);
 789         *prompts = xcalloc((*num + 1), sizeof(char *));
 790         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 791         for (i = 0; i < *num; ++i) {
 792                 (*prompts)[i] = buffer_get_string(&m, NULL);
 793                 (*echo_on)[i] = buffer_get_int(&m);
 794         }
 795         buffer_free(&m);
 796         return (ret);
 797 }
 798
 799 int
 800 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 801 {
 802         Buffer m;
 803         u_int i;
 804         int ret;
 805
 806         debug3("%s", __func__);
 807         buffer_init(&m);
 808         buffer_put_int(&m, num);
 809         for (i = 0; i < num; ++i)
 810                 buffer_put_cstring(&m, resp[i]);
 811         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 812         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 813         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 814         ret = buffer_get_int(&m);
 815         debug3("%s: pam_respond returned %d", __func__, ret);
 816         buffer_free(&m);
 817         return (ret);
 818 }
 819
 820 void
 821 mm_sshpam_free_ctx(void *ctxtp)
 822 {
 823         Buffer m;
 824
 825         debug3("%s", __func__);
 826         buffer_init(&m);
 827         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 828         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 829         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 830         buffer_free(&m);
 831 }
 832 #endif /* USE_PAM */
 833
 834 /* Request process termination */
 835
 836 void
 837 mm_terminate(void)
 838 {
 839         Buffer m;
 840
 841         buffer_init(&m);
 842         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 843         buffer_free(&m);
 844 }
 845
 846 int
 847 mm_ssh1_session_key(BIGNUM *num)
 848 {
 849         int rsafail;
 850         Buffer m;
 851
 852         buffer_init(&m);
 853         buffer_put_bignum2(&m, num);
 854         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 855
 856         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 857
 858         rsafail = buffer_get_int(&m);
 859         buffer_get_bignum2(&m, num);
 860
 861         buffer_free(&m);
 862
 863         return (rsafail);
 864 }
 865
 866 static void
 867 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 868     char ***prompts, u_int **echo_on)
 869 {
 870         *name = xstrdup("");
 871         *infotxt = xstrdup("");
 872         *numprompts = 1;
 873         *prompts = xcalloc(*numprompts, sizeof(char *));
 874         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 875         (*echo_on)[0] = 0;
 876 }
 877
 878 int
 879 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 880    u_int *numprompts, char ***prompts, u_int **echo_on)
 881 {
 882         Buffer m;
 883         u_int success;
 884         char *challenge;
 885
 886         debug3("%s: entering", __func__);
 887
 888         buffer_init(&m);
 889         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 890
 891         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 892             &m);
 893         success = buffer_get_int(&m);
 894         if (success == 0) {
 895                 debug3("%s: no challenge", __func__);
 896                 buffer_free(&m);
 897                 return (-1);
 898         }
 899
 900         /* Get the challenge, and format the response */
 901         challenge  = buffer_get_string(&m, NULL);
 902         buffer_free(&m);
 903
 904         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 905         (*prompts)[0] = challenge;
 906
 907         debug3("%s: received challenge: %s", __func__, challenge);
 908
 909         return (0);
 910 }
 911
 912 int
 913 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 914 {
 915         Buffer m;
 916         int authok;
 917
 918         debug3("%s: entering", __func__);
 919         if (numresponses != 1)
 920                 return (-1);
 921
 922         buffer_init(&m);
 923         buffer_put_cstring(&m, responses[0]);
 924         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 925
 926         mm_request_receive_expect(pmonitor->m_recvfd,
 927             MONITOR_ANS_BSDAUTHRESPOND, &m);
 928
 929         authok = buffer_get_int(&m);
 930         buffer_free(&m);
 931
 932         return ((authok == 0) ? -1 : 0);
 933 }
 934
 935 #ifdef SKEY
 936 int
 937 mm_skey_query(void *ctx, char **name, char **infotxt,
 938    u_int *numprompts, char ***prompts, u_int **echo_on)
 939 {
 940         Buffer m;
 941         int len;
 942         u_int success;
 943         char *p, *challenge;
 944
 945         debug3("%s: entering", __func__);
 946
 947         buffer_init(&m);
 948         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 949
 950         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 951             &m);
 952         success = buffer_get_int(&m);
 953         if (success == 0) {
 954                 debug3("%s: no challenge", __func__);
 955                 buffer_free(&m);
 956                 return (-1);
 957         }
 958
 959         /* Get the challenge, and format the response */
 960         challenge  = buffer_get_string(&m, NULL);
 961         buffer_free(&m);
 962
 963         debug3("%s: received challenge: %s", __func__, challenge);
 964
 965         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 966
 967         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
 968         xfree(challenge);
 969
 970         return (0);
 971 }
 972
 973 int
 974 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 975 {
 976         Buffer m;
 977         int authok;
 978
 979         debug3("%s: entering", __func__);
 980         if (numresponses != 1)
 981                 return (-1);
 982
 983         buffer_init(&m);
 984         buffer_put_cstring(&m, responses[0]);
 985         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
 986
 987         mm_request_receive_expect(pmonitor->m_recvfd,
 988             MONITOR_ANS_SKEYRESPOND, &m);
 989
 990         authok = buffer_get_int(&m);
 991         buffer_free(&m);
 992
 993         return ((authok == 0) ? -1 : 0);
 994 }
 995 #endif /* SKEY */
 996
 997 void
 998 mm_ssh1_session_id(u_char session_id[16])
 999 {
1000         Buffer m;
1001         int i;
1002
1003         debug3("%s entering", __func__);
1004
1005         buffer_init(&m);
1006         for (i = 0; i < 16; i++)
1007                 buffer_put_char(&m, session_id[i]);
1008
1009         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1010         buffer_free(&m);
1011 }
1012
1013 int
1014 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1015 {
1016         Buffer m;
1017         Key *key;
1018         u_char *blob;
1019         u_int blen;
1020         int allowed = 0, have_forced = 0;
1021
1022         debug3("%s entering", __func__);
1023
1024         buffer_init(&m);
1025         buffer_put_bignum2(&m, client_n);
1026
1027         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1028         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1029
1030         allowed = buffer_get_int(&m);
1031
1032         /* fake forced command */
1033         auth_clear_options();
1034         have_forced = buffer_get_int(&m);
1035         forced_command = have_forced ? xstrdup("true") : NULL;
1036
1037         if (allowed && rkey != NULL) {
1038                 blob = buffer_get_string(&m, &blen);
1039                 if ((key = key_from_blob(blob, blen)) == NULL)
1040                         fatal("%s: key_from_blob failed", __func__);
1041                 *rkey = key;
1042                 xfree(blob);
1043         }
1044         mm_send_debug(&m);
1045         buffer_free(&m);
1046
1047         return (allowed);
1048 }
1049
1050 BIGNUM *
1051 mm_auth_rsa_generate_challenge(Key *key)
1052 {
1053         Buffer m;
1054         BIGNUM *challenge;
1055         u_char *blob;
1056         u_int blen;
1057
1058         debug3("%s entering", __func__);
1059
1060         if ((challenge = BN_new()) == NULL)
1061                 fatal("%s: BN_new failed", __func__);
1062
1063         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1064         if (key_to_blob(key, &blob, &blen) == 0)
1065                 fatal("%s: key_to_blob failed", __func__);
1066         key->type = KEY_RSA1;
1067
1068         buffer_init(&m);
1069         buffer_put_string(&m, blob, blen);
1070         xfree(blob);
1071
1072         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1073         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1074
1075         buffer_get_bignum2(&m, challenge);
1076         buffer_free(&m);
1077
1078         return (challenge);
1079 }
1080
1081 int
1082 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1083 {
1084         Buffer m;
1085         u_char *blob;
1086         u_int blen;
1087         int success = 0;
1088
1089         debug3("%s entering", __func__);
1090
1091         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1092         if (key_to_blob(key, &blob, &blen) == 0)
1093                 fatal("%s: key_to_blob failed", __func__);
1094         key->type = KEY_RSA1;
1095
1096         buffer_init(&m);
1097         buffer_put_string(&m, blob, blen);
1098         buffer_put_string(&m, response, 16);
1099         xfree(blob);
1100
1101         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1102         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1103
1104         success = buffer_get_int(&m);
1105         buffer_free(&m);
1106
1107         return (success);
1108 }
1109
1110 #ifdef SSH_AUDIT_EVENTS
1111 void
1112 mm_audit_event(ssh_audit_event_t event)
1113 {
1114         Buffer m;
1115
1116         debug3("%s entering", __func__);
1117
1118         buffer_init(&m);
1119         buffer_put_int(&m, event);
1120
1121         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1122         buffer_free(&m);
1123 }
1124
1125 void
1126 mm_audit_run_command(const char *command)
1127 {
1128         Buffer m;
1129
1130         debug3("%s entering command %s", __func__, command);
1131
1132         buffer_init(&m);
1133         buffer_put_cstring(&m, command);
1134
1135         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1136         buffer_free(&m);
1137 }
1138 #endif /* SSH_AUDIT_EVENTS */
1139
1140 #ifdef GSSAPI
1141 OM_uint32
1142 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1143 {
1144         Buffer m;
1145         OM_uint32 major;
1146
1147         /* Client doesn't get to see the context */
1148         *ctx = NULL;
1149
1150         buffer_init(&m);
1151         buffer_put_string(&m, goid->elements, goid->length);
1152
1153         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1154         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1155
1156         major = buffer_get_int(&m);
1157
1158         buffer_free(&m);
1159         return (major);
1160 }
1161
1162 OM_uint32
1163 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1164     gss_buffer_desc *out, OM_uint32 *flags)
1165 {
1166         Buffer m;
1167         OM_uint32 major;
1168         u_int len;
1169
1170         buffer_init(&m);
1171         buffer_put_string(&m, in->value, in->length);
1172
1173         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1174         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1175
1176         major = buffer_get_int(&m);
1177         out->value = buffer_get_string(&m, &len);
1178         out->length = len;
1179         if (flags)
1180                 *flags = buffer_get_int(&m);
1181
1182         buffer_free(&m);
1183
1184         return (major);
1185 }
1186
1187 OM_uint32
1188 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1189 {
1190         Buffer m;
1191         OM_uint32 major;
1192
1193         buffer_init(&m);
1194         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1195         buffer_put_string(&m, gssmic->value, gssmic->length);
1196
1197         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1198         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1199             &m);
1200
1201         major = buffer_get_int(&m);
1202         buffer_free(&m);
1203         return(major);
1204 }
1205
1206 int
1207 mm_ssh_gssapi_userok(char *user)
1208 {
1209         Buffer m;
1210         int authenticated = 0;
1211
1212         buffer_init(&m);
1213
1214         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1215         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1216                                   &m);
1217
1218         authenticated = buffer_get_int(&m);
1219
1220         buffer_free(&m);
1221         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1222         return (authenticated);
1223 }
1224 #endif /* GSSAPI */