monitor_wrap.c

   1 /* $OpenBSD: monitor_wrap.c,v 1.47 2006/07/11 20:07:25 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
  38 #include "ssh.h"
  39 #include "dh.h"
  40 #include "kex.h"
  41 #include "auth.h"
  42 #include "auth-options.h"
  43 #include "buffer.h"
  44 #include "bufaux.h"
  45 #include "packet.h"
  46 #include "mac.h"
  47 #include "log.h"
  48 #ifdef TARGET_OS_MAC    /* XXX Broken krb5 headers on Mac */
  49 #undef TARGET_OS_MAC
  50 #include "zlib.h"
  51 #define TARGET_OS_MAC 1
  52 #else
  53 #include "zlib.h"
  54 #endif
  55 #include "monitor.h"
  56 #include "monitor_wrap.h"
  57 #include "xmalloc.h"
  58 #include "atomicio.h"
  59 #include "monitor_fdpass.h"
  60 #include "misc.h"
  61 #include "servconf.h"
  62
  63 #include "auth.h"
  64 #include "channels.h"
  65 #include "session.h"
  66
  67 #ifdef GSSAPI
  68 #include "ssh-gss.h"
  69 #endif
  70
  71 /* Imports */
  72 extern int compat20;
  73 extern Newkeys *newkeys[];
  74 extern z_stream incoming_stream;
  75 extern z_stream outgoing_stream;
  76 extern struct monitor *pmonitor;
  77 extern Buffer input, output;
  78 extern Buffer loginmsg;
  79 extern ServerOptions options;
  80
  81 int
  82 mm_is_monitor(void)
  83 {
  84         /*
  85          * m_pid is only set in the privileged part, and
  86          * points to the unprivileged child.
  87          */
  88         return (pmonitor && pmonitor->m_pid > 0);
  89 }
  90
  91 void
  92 mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
  93 {
  94         u_int mlen = buffer_len(m);
  95         u_char buf[5];
  96
  97         debug3("%s entering: type %d", __func__, type);
  98
  99         put_u32(buf, mlen + 1);
 100         buf[4] = (u_char) type;         /* 1st byte of payload is mesg-type */
 101         if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
 102                 fatal("%s: write: %s", __func__, strerror(errno));
 103         if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
 104                 fatal("%s: write: %s", __func__, strerror(errno));
 105 }
 106
 107 void
 108 mm_request_receive(int sock, Buffer *m)
 109 {
 110         u_char buf[4];
 111         u_int msg_len;
 112
 113         debug3("%s entering", __func__);
 114
 115         if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
 116                 if (errno == EPIPE)
 117                         cleanup_exit(255);
 118                 fatal("%s: read: %s", __func__, strerror(errno));
 119         }
 120         msg_len = get_u32(buf);
 121         if (msg_len > 256 * 1024)
 122                 fatal("%s: read: bad msg_len %d", __func__, msg_len);
 123         buffer_clear(m);
 124         buffer_append_space(m, msg_len);
 125         if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
 126                 fatal("%s: read: %s", __func__, strerror(errno));
 127 }
 128
 129 void
 130 mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
 131 {
 132         u_char rtype;
 133
 134         debug3("%s entering: type %d", __func__, type);
 135
 136         mm_request_receive(sock, m);
 137         rtype = buffer_get_char(m);
 138         if (rtype != type)
 139                 fatal("%s: read: rtype %d != type %d", __func__,
 140                     rtype, type);
 141 }
 142
 143 DH *
 144 mm_choose_dh(int min, int nbits, int max)
 145 {
 146         BIGNUM *p, *g;
 147         int success = 0;
 148         Buffer m;
 149
 150         buffer_init(&m);
 151         buffer_put_int(&m, min);
 152         buffer_put_int(&m, nbits);
 153         buffer_put_int(&m, max);
 154
 155         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
 156
 157         debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
 158         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
 159
 160         success = buffer_get_char(&m);
 161         if (success == 0)
 162                 fatal("%s: MONITOR_ANS_MODULI failed", __func__);
 163
 164         if ((p = BN_new()) == NULL)
 165                 fatal("%s: BN_new failed", __func__);
 166         if ((g = BN_new()) == NULL)
 167                 fatal("%s: BN_new failed", __func__);
 168         buffer_get_bignum2(&m, p);
 169         buffer_get_bignum2(&m, g);
 170
 171         debug3("%s: remaining %d", __func__, buffer_len(&m));
 172         buffer_free(&m);
 173
 174         return (dh_new_group(g, p));
 175 }
 176
 177 int
 178 mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
 179 {
 180         Kex *kex = *pmonitor->m_pkex;
 181         Buffer m;
 182
 183         debug3("%s entering", __func__);
 184
 185         buffer_init(&m);
 186         buffer_put_int(&m, kex->host_key_index(key));
 187         buffer_put_string(&m, data, datalen);
 188
 189         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
 190
 191         debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
 192         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
 193         *sigp  = buffer_get_string(&m, lenp);
 194         buffer_free(&m);
 195
 196         return (0);
 197 }
 198
 199 struct passwd *
 200 mm_getpwnamallow(const char *username)
 201 {
 202         Buffer m;
 203         struct passwd *pw;
 204         u_int pwlen;
 205
 206         debug3("%s entering", __func__);
 207
 208         buffer_init(&m);
 209         buffer_put_cstring(&m, username);
 210
 211         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
 212
 213         debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
 214         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
 215
 216         if (buffer_get_char(&m) == 0) {
 217                 buffer_free(&m);
 218                 return (NULL);
 219         }
 220         pw = buffer_get_string(&m, &pwlen);
 221         if (pwlen != sizeof(struct passwd))
 222                 fatal("%s: struct passwd size mismatch", __func__);
 223         pw->pw_name = buffer_get_string(&m, NULL);
 224         pw->pw_passwd = buffer_get_string(&m, NULL);
 225         pw->pw_gecos = buffer_get_string(&m, NULL);
 226 #ifdef HAVE_PW_CLASS_IN_PASSWD
 227         pw->pw_class = buffer_get_string(&m, NULL);
 228 #endif
 229         pw->pw_dir = buffer_get_string(&m, NULL);
 230         pw->pw_shell = buffer_get_string(&m, NULL);
 231         buffer_free(&m);
 232
 233         return (pw);
 234 }
 235
 236 char *
 237 mm_auth2_read_banner(void)
 238 {
 239         Buffer m;
 240         char *banner;
 241
 242         debug3("%s entering", __func__);
 243
 244         buffer_init(&m);
 245         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
 246         buffer_clear(&m);
 247
 248         mm_request_receive_expect(pmonitor->m_recvfd,
 249             MONITOR_ANS_AUTH2_READ_BANNER, &m);
 250         banner = buffer_get_string(&m, NULL);
 251         buffer_free(&m);
 252
 253         /* treat empty banner as missing banner */
 254         if (strlen(banner) == 0) {
 255                 xfree(banner);
 256                 banner = NULL;
 257         }
 258         return (banner);
 259 }
 260
 261 /* Inform the privileged process about service and style */
 262
 263 void
 264 mm_inform_authserv(char *service, char *style)
 265 {
 266         Buffer m;
 267
 268         debug3("%s entering", __func__);
 269
 270         buffer_init(&m);
 271         buffer_put_cstring(&m, service);
 272         buffer_put_cstring(&m, style ? style : "");
 273
 274         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
 275
 276         buffer_free(&m);
 277 }
 278
 279 /* Do the password authentication */
 280 int
 281 mm_auth_password(Authctxt *authctxt, char *password)
 282 {
 283         Buffer m;
 284         int authenticated = 0;
 285
 286         debug3("%s entering", __func__);
 287
 288         buffer_init(&m);
 289         buffer_put_cstring(&m, password);
 290         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
 291
 292         debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
 293         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
 294
 295         authenticated = buffer_get_int(&m);
 296
 297         buffer_free(&m);
 298
 299         debug3("%s: user %sauthenticated",
 300             __func__, authenticated ? "" : "not ");
 301         return (authenticated);
 302 }
 303
 304 int
 305 mm_user_key_allowed(struct passwd *pw, Key *key)
 306 {
 307         return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
 308 }
 309
 310 int
 311 mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
 312     Key *key)
 313 {
 314         return (mm_key_allowed(MM_HOSTKEY, user, host, key));
 315 }
 316
 317 int
 318 mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
 319     char *host, Key *key)
 320 {
 321         int ret;
 322
 323         key->type = KEY_RSA; /* XXX hack for key_to_blob */
 324         ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
 325         key->type = KEY_RSA1;
 326         return (ret);
 327 }
 328
 329 static void
 330 mm_send_debug(Buffer *m)
 331 {
 332         char *msg;
 333
 334         while (buffer_len(m)) {
 335                 msg = buffer_get_string(m, NULL);
 336                 debug3("%s: Sending debug: %s", __func__, msg);
 337                 packet_send_debug("%s", msg);
 338                 xfree(msg);
 339         }
 340 }
 341
 342 int
 343 mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
 344 {
 345         Buffer m;
 346         u_char *blob;
 347         u_int len;
 348         int allowed = 0, have_forced = 0;
 349
 350         debug3("%s entering", __func__);
 351
 352         /* Convert the key to a blob and the pass it over */
 353         if (!key_to_blob(key, &blob, &len))
 354                 return (0);
 355
 356         buffer_init(&m);
 357         buffer_put_int(&m, type);
 358         buffer_put_cstring(&m, user ? user : "");
 359         buffer_put_cstring(&m, host ? host : "");
 360         buffer_put_string(&m, blob, len);
 361         xfree(blob);
 362
 363         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
 364
 365         debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
 366         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
 367
 368         allowed = buffer_get_int(&m);
 369
 370         /* fake forced command */
 371         auth_clear_options();
 372         have_forced = buffer_get_int(&m);
 373         forced_command = have_forced ? xstrdup("true") : NULL;
 374
 375         /* Send potential debug messages */
 376         mm_send_debug(&m);
 377
 378         buffer_free(&m);
 379
 380         return (allowed);
 381 }
 382
 383 /*
 384  * This key verify needs to send the key type along, because the
 385  * privileged parent makes the decision if the key is allowed
 386  * for authentication.
 387  */
 388
 389 int
 390 mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
 391 {
 392         Buffer m;
 393         u_char *blob;
 394         u_int len;
 395         int verified = 0;
 396
 397         debug3("%s entering", __func__);
 398
 399         /* Convert the key to a blob and the pass it over */
 400         if (!key_to_blob(key, &blob, &len))
 401                 return (0);
 402
 403         buffer_init(&m);
 404         buffer_put_string(&m, blob, len);
 405         buffer_put_string(&m, sig, siglen);
 406         buffer_put_string(&m, data, datalen);
 407         xfree(blob);
 408
 409         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
 410
 411         debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
 412         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
 413
 414         verified = buffer_get_int(&m);
 415
 416         buffer_free(&m);
 417
 418         return (verified);
 419 }
 420
 421 /* Export key state after authentication */
 422 Newkeys *
 423 mm_newkeys_from_blob(u_char *blob, int blen)
 424 {
 425         Buffer b;
 426         u_int len;
 427         Newkeys *newkey = NULL;
 428         Enc *enc;
 429         Mac *mac;
 430         Comp *comp;
 431
 432         debug3("%s: %p(%d)", __func__, blob, blen);
 433 #ifdef DEBUG_PK
 434         dump_base64(stderr, blob, blen);
 435 #endif
 436         buffer_init(&b);
 437         buffer_append(&b, blob, blen);
 438
 439         newkey = xmalloc(sizeof(*newkey));
 440         enc = &newkey->enc;
 441         mac = &newkey->mac;
 442         comp = &newkey->comp;
 443
 444         /* Enc structure */
 445         enc->name = buffer_get_string(&b, NULL);
 446         buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
 447         enc->enabled = buffer_get_int(&b);
 448         enc->block_size = buffer_get_int(&b);
 449         enc->key = buffer_get_string(&b, &enc->key_len);
 450         enc->iv = buffer_get_string(&b, &len);
 451         if (len != enc->block_size)
 452                 fatal("%s: bad ivlen: expected %u != %u", __func__,
 453                     enc->block_size, len);
 454
 455         if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
 456                 fatal("%s: bad cipher name %s or pointer %p", __func__,
 457                     enc->name, enc->cipher);
 458
 459         /* Mac structure */
 460         mac->name = buffer_get_string(&b, NULL);
 461         if (mac->name == NULL || mac_init(mac, mac->name) == -1)
 462                 fatal("%s: can not init mac %s", __func__, mac->name);
 463         mac->enabled = buffer_get_int(&b);
 464         mac->key = buffer_get_string(&b, &len);
 465         if (len > mac->key_len)
 466                 fatal("%s: bad mac key length: %u > %d", __func__, len,
 467                     mac->key_len);
 468         mac->key_len = len;
 469
 470         /* Comp structure */
 471         comp->type = buffer_get_int(&b);
 472         comp->enabled = buffer_get_int(&b);
 473         comp->name = buffer_get_string(&b, NULL);
 474
 475         len = buffer_len(&b);
 476         if (len != 0)
 477                 error("newkeys_from_blob: remaining bytes in blob %u", len);
 478         buffer_free(&b);
 479         return (newkey);
 480 }
 481
 482 int
 483 mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
 484 {
 485         Buffer b;
 486         int len;
 487         Enc *enc;
 488         Mac *mac;
 489         Comp *comp;
 490         Newkeys *newkey = newkeys[mode];
 491
 492         debug3("%s: converting %p", __func__, newkey);
 493
 494         if (newkey == NULL) {
 495                 error("%s: newkey == NULL", __func__);
 496                 return 0;
 497         }
 498         enc = &newkey->enc;
 499         mac = &newkey->mac;
 500         comp = &newkey->comp;
 501
 502         buffer_init(&b);
 503         /* Enc structure */
 504         buffer_put_cstring(&b, enc->name);
 505         /* The cipher struct is constant and shared, you export pointer */
 506         buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
 507         buffer_put_int(&b, enc->enabled);
 508         buffer_put_int(&b, enc->block_size);
 509         buffer_put_string(&b, enc->key, enc->key_len);
 510         packet_get_keyiv(mode, enc->iv, enc->block_size);
 511         buffer_put_string(&b, enc->iv, enc->block_size);
 512
 513         /* Mac structure */
 514         buffer_put_cstring(&b, mac->name);
 515         buffer_put_int(&b, mac->enabled);
 516         buffer_put_string(&b, mac->key, mac->key_len);
 517
 518         /* Comp structure */
 519         buffer_put_int(&b, comp->type);
 520         buffer_put_int(&b, comp->enabled);
 521         buffer_put_cstring(&b, comp->name);
 522
 523         len = buffer_len(&b);
 524         if (lenp != NULL)
 525                 *lenp = len;
 526         if (blobp != NULL) {
 527                 *blobp = xmalloc(len);
 528                 memcpy(*blobp, buffer_ptr(&b), len);
 529         }
 530         memset(buffer_ptr(&b), 0, len);
 531         buffer_free(&b);
 532         return len;
 533 }
 534
 535 static void
 536 mm_send_kex(Buffer *m, Kex *kex)
 537 {
 538         buffer_put_string(m, kex->session_id, kex->session_id_len);
 539         buffer_put_int(m, kex->we_need);
 540         buffer_put_int(m, kex->hostkey_type);
 541         buffer_put_int(m, kex->kex_type);
 542         buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
 543         buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
 544         buffer_put_int(m, kex->flags);
 545         buffer_put_cstring(m, kex->client_version_string);
 546         buffer_put_cstring(m, kex->server_version_string);
 547 }
 548
 549 void
 550 mm_send_keystate(struct monitor *monitor)
 551 {
 552         Buffer m;
 553         u_char *blob, *p;
 554         u_int bloblen, plen;
 555         u_int32_t seqnr, packets;
 556         u_int64_t blocks;
 557
 558         buffer_init(&m);
 559
 560         if (!compat20) {
 561                 u_char iv[24];
 562                 u_char *key;
 563                 u_int ivlen, keylen;
 564
 565                 buffer_put_int(&m, packet_get_protocol_flags());
 566
 567                 buffer_put_int(&m, packet_get_ssh1_cipher());
 568
 569                 debug3("%s: Sending ssh1 KEY+IV", __func__);
 570                 keylen = packet_get_encryption_key(NULL);
 571                 key = xmalloc(keylen+1);        /* add 1 if keylen == 0 */
 572                 keylen = packet_get_encryption_key(key);
 573                 buffer_put_string(&m, key, keylen);
 574                 memset(key, 0, keylen);
 575                 xfree(key);
 576
 577                 ivlen = packet_get_keyiv_len(MODE_OUT);
 578                 packet_get_keyiv(MODE_OUT, iv, ivlen);
 579                 buffer_put_string(&m, iv, ivlen);
 580                 ivlen = packet_get_keyiv_len(MODE_OUT);
 581                 packet_get_keyiv(MODE_IN, iv, ivlen);
 582                 buffer_put_string(&m, iv, ivlen);
 583                 goto skip;
 584         } else {
 585                 /* Kex for rekeying */
 586                 mm_send_kex(&m, *monitor->m_pkex);
 587         }
 588
 589         debug3("%s: Sending new keys: %p %p",
 590             __func__, newkeys[MODE_OUT], newkeys[MODE_IN]);
 591
 592         /* Keys from Kex */
 593         if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
 594                 fatal("%s: conversion of newkeys failed", __func__);
 595
 596         buffer_put_string(&m, blob, bloblen);
 597         xfree(blob);
 598
 599         if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
 600                 fatal("%s: conversion of newkeys failed", __func__);
 601
 602         buffer_put_string(&m, blob, bloblen);
 603         xfree(blob);
 604
 605         packet_get_state(MODE_OUT, &seqnr, &blocks, &packets);
 606         buffer_put_int(&m, seqnr);
 607         buffer_put_int64(&m, blocks);
 608         buffer_put_int(&m, packets);
 609         packet_get_state(MODE_IN, &seqnr, &blocks, &packets);
 610         buffer_put_int(&m, seqnr);
 611         buffer_put_int64(&m, blocks);
 612         buffer_put_int(&m, packets);
 613
 614         debug3("%s: New keys have been sent", __func__);
 615  skip:
 616         /* More key context */
 617         plen = packet_get_keycontext(MODE_OUT, NULL);
 618         p = xmalloc(plen+1);
 619         packet_get_keycontext(MODE_OUT, p);
 620         buffer_put_string(&m, p, plen);
 621         xfree(p);
 622
 623         plen = packet_get_keycontext(MODE_IN, NULL);
 624         p = xmalloc(plen+1);
 625         packet_get_keycontext(MODE_IN, p);
 626         buffer_put_string(&m, p, plen);
 627         xfree(p);
 628
 629         /* Compression state */
 630         debug3("%s: Sending compression state", __func__);
 631         buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
 632         buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
 633
 634         /* Network I/O buffers */
 635         buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
 636         buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
 637
 638         mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
 639         debug3("%s: Finished sending state", __func__);
 640
 641         buffer_free(&m);
 642 }
 643
 644 int
 645 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
 646 {
 647         Buffer m;
 648         char *p, *msg;
 649         int success = 0;
 650
 651         buffer_init(&m);
 652         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
 653
 654         debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
 655         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
 656
 657         success = buffer_get_int(&m);
 658         if (success == 0) {
 659                 debug3("%s: pty alloc failed", __func__);
 660                 buffer_free(&m);
 661                 return (0);
 662         }
 663         p = buffer_get_string(&m, NULL);
 664         msg = buffer_get_string(&m, NULL);
 665         buffer_free(&m);
 666
 667         strlcpy(namebuf, p, namebuflen); /* Possible truncation */
 668         xfree(p);
 669
 670         buffer_append(&loginmsg, msg, strlen(msg));
 671         xfree(msg);
 672
 673         *ptyfd = mm_receive_fd(pmonitor->m_recvfd);
 674         *ttyfd = mm_receive_fd(pmonitor->m_recvfd);
 675
 676         /* Success */
 677         return (1);
 678 }
 679
 680 void
 681 mm_session_pty_cleanup2(Session *s)
 682 {
 683         Buffer m;
 684
 685         if (s->ttyfd == -1)
 686                 return;
 687         buffer_init(&m);
 688         buffer_put_cstring(&m, s->tty);
 689         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
 690         buffer_free(&m);
 691
 692         /* closed dup'ed master */
 693         if (close(s->ptymaster) < 0)
 694                 error("close(s->ptymaster): %s", strerror(errno));
 695
 696         /* unlink pty from session */
 697         s->ttyfd = -1;
 698 }
 699
 700 #ifdef USE_PAM
 701 void
 702 mm_start_pam(Authctxt *authctxt)
 703 {
 704         Buffer m;
 705
 706         debug3("%s entering", __func__);
 707         if (!options.use_pam)
 708                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 709
 710         buffer_init(&m);
 711         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);
 712
 713         buffer_free(&m);
 714 }
 715
 716 u_int
 717 mm_do_pam_account(void)
 718 {
 719         Buffer m;
 720         u_int ret;
 721         char *msg;
 722
 723         debug3("%s entering", __func__);
 724         if (!options.use_pam)
 725                 fatal("UsePAM=no, but ended up in %s anyway", __func__);
 726
 727         buffer_init(&m);
 728         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);
 729
 730         mm_request_receive_expect(pmonitor->m_recvfd,
 731             MONITOR_ANS_PAM_ACCOUNT, &m);
 732         ret = buffer_get_int(&m);
 733         msg = buffer_get_string(&m, NULL);
 734         buffer_append(&loginmsg, msg, strlen(msg));
 735         xfree(msg);
 736
 737         buffer_free(&m);
 738
 739         debug3("%s returning %d", __func__, ret);
 740
 741         return (ret);
 742 }
 743
 744 void *
 745 mm_sshpam_init_ctx(Authctxt *authctxt)
 746 {
 747         Buffer m;
 748         int success;
 749
 750         debug3("%s", __func__);
 751         buffer_init(&m);
 752         buffer_put_cstring(&m, authctxt->user);
 753         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
 754         debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
 755         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
 756         success = buffer_get_int(&m);
 757         if (success == 0) {
 758                 debug3("%s: pam_init_ctx failed", __func__);
 759                 buffer_free(&m);
 760                 return (NULL);
 761         }
 762         buffer_free(&m);
 763         return (authctxt);
 764 }
 765
 766 int
 767 mm_sshpam_query(void *ctx, char **name, char **info,
 768     u_int *num, char ***prompts, u_int **echo_on)
 769 {
 770         Buffer m;
 771         u_int i;
 772         int ret;
 773
 774         debug3("%s", __func__);
 775         buffer_init(&m);
 776         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
 777         debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
 778         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
 779         ret = buffer_get_int(&m);
 780         debug3("%s: pam_query returned %d", __func__, ret);
 781         *name = buffer_get_string(&m, NULL);
 782         *info = buffer_get_string(&m, NULL);
 783         *num = buffer_get_int(&m);
 784         if (*num > PAM_MAX_NUM_MSG)
 785                 fatal("%s: recieved %u PAM messages, expected <= %u",
 786                     __func__, *num, PAM_MAX_NUM_MSG);
 787         *prompts = xcalloc((*num + 1), sizeof(char *));
 788         *echo_on = xcalloc((*num + 1), sizeof(u_int));
 789         for (i = 0; i < *num; ++i) {
 790                 (*prompts)[i] = buffer_get_string(&m, NULL);
 791                 (*echo_on)[i] = buffer_get_int(&m);
 792         }
 793         buffer_free(&m);
 794         return (ret);
 795 }
 796
 797 int
 798 mm_sshpam_respond(void *ctx, u_int num, char **resp)
 799 {
 800         Buffer m;
 801         u_int i;
 802         int ret;
 803
 804         debug3("%s", __func__);
 805         buffer_init(&m);
 806         buffer_put_int(&m, num);
 807         for (i = 0; i < num; ++i)
 808                 buffer_put_cstring(&m, resp[i]);
 809         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
 810         debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
 811         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
 812         ret = buffer_get_int(&m);
 813         debug3("%s: pam_respond returned %d", __func__, ret);
 814         buffer_free(&m);
 815         return (ret);
 816 }
 817
 818 void
 819 mm_sshpam_free_ctx(void *ctxtp)
 820 {
 821         Buffer m;
 822
 823         debug3("%s", __func__);
 824         buffer_init(&m);
 825         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
 826         debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
 827         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
 828         buffer_free(&m);
 829 }
 830 #endif /* USE_PAM */
 831
 832 /* Request process termination */
 833
 834 void
 835 mm_terminate(void)
 836 {
 837         Buffer m;
 838
 839         buffer_init(&m);
 840         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
 841         buffer_free(&m);
 842 }
 843
 844 int
 845 mm_ssh1_session_key(BIGNUM *num)
 846 {
 847         int rsafail;
 848         Buffer m;
 849
 850         buffer_init(&m);
 851         buffer_put_bignum2(&m, num);
 852         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
 853
 854         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
 855
 856         rsafail = buffer_get_int(&m);
 857         buffer_get_bignum2(&m, num);
 858
 859         buffer_free(&m);
 860
 861         return (rsafail);
 862 }
 863
 864 static void
 865 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
 866     char ***prompts, u_int **echo_on)
 867 {
 868         *name = xstrdup("");
 869         *infotxt = xstrdup("");
 870         *numprompts = 1;
 871         *prompts = xcalloc(*numprompts, sizeof(char *));
 872         *echo_on = xcalloc(*numprompts, sizeof(u_int));
 873         (*echo_on)[0] = 0;
 874 }
 875
 876 int
 877 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
 878    u_int *numprompts, char ***prompts, u_int **echo_on)
 879 {
 880         Buffer m;
 881         u_int success;
 882         char *challenge;
 883
 884         debug3("%s: entering", __func__);
 885
 886         buffer_init(&m);
 887         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
 888
 889         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
 890             &m);
 891         success = buffer_get_int(&m);
 892         if (success == 0) {
 893                 debug3("%s: no challenge", __func__);
 894                 buffer_free(&m);
 895                 return (-1);
 896         }
 897
 898         /* Get the challenge, and format the response */
 899         challenge  = buffer_get_string(&m, NULL);
 900         buffer_free(&m);
 901
 902         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 903         (*prompts)[0] = challenge;
 904
 905         debug3("%s: received challenge: %s", __func__, challenge);
 906
 907         return (0);
 908 }
 909
 910 int
 911 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 912 {
 913         Buffer m;
 914         int authok;
 915
 916         debug3("%s: entering", __func__);
 917         if (numresponses != 1)
 918                 return (-1);
 919
 920         buffer_init(&m);
 921         buffer_put_cstring(&m, responses[0]);
 922         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
 923
 924         mm_request_receive_expect(pmonitor->m_recvfd,
 925             MONITOR_ANS_BSDAUTHRESPOND, &m);
 926
 927         authok = buffer_get_int(&m);
 928         buffer_free(&m);
 929
 930         return ((authok == 0) ? -1 : 0);
 931 }
 932
 933 #ifdef SKEY
 934 int
 935 mm_skey_query(void *ctx, char **name, char **infotxt,
 936    u_int *numprompts, char ***prompts, u_int **echo_on)
 937 {
 938         Buffer m;
 939         int len;
 940         u_int success;
 941         char *p, *challenge;
 942
 943         debug3("%s: entering", __func__);
 944
 945         buffer_init(&m);
 946         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
 947
 948         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
 949             &m);
 950         success = buffer_get_int(&m);
 951         if (success == 0) {
 952                 debug3("%s: no challenge", __func__);
 953                 buffer_free(&m);
 954                 return (-1);
 955         }
 956
 957         /* Get the challenge, and format the response */
 958         challenge  = buffer_get_string(&m, NULL);
 959         buffer_free(&m);
 960
 961         debug3("%s: received challenge: %s", __func__, challenge);
 962
 963         mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
 964
 965         xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
 966         xfree(challenge);
 967
 968         return (0);
 969 }
 970
 971 int
 972 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
 973 {
 974         Buffer m;
 975         int authok;
 976
 977         debug3("%s: entering", __func__);
 978         if (numresponses != 1)
 979                 return (-1);
 980
 981         buffer_init(&m);
 982         buffer_put_cstring(&m, responses[0]);
 983         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
 984
 985         mm_request_receive_expect(pmonitor->m_recvfd,
 986             MONITOR_ANS_SKEYRESPOND, &m);
 987
 988         authok = buffer_get_int(&m);
 989         buffer_free(&m);
 990
 991         return ((authok == 0) ? -1 : 0);
 992 }
 993 #endif /* SKEY */
 994
 995 void
 996 mm_ssh1_session_id(u_char session_id[16])
 997 {
 998         Buffer m;
 999         int i;
1000
1001         debug3("%s entering", __func__);
1002
1003         buffer_init(&m);
1004         for (i = 0; i < 16; i++)
1005                 buffer_put_char(&m, session_id[i]);
1006
1007         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1008         buffer_free(&m);
1009 }
1010
1011 int
1012 mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
1013 {
1014         Buffer m;
1015         Key *key;
1016         u_char *blob;
1017         u_int blen;
1018         int allowed = 0, have_forced = 0;
1019
1020         debug3("%s entering", __func__);
1021
1022         buffer_init(&m);
1023         buffer_put_bignum2(&m, client_n);
1024
1025         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
1026         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1027
1028         allowed = buffer_get_int(&m);
1029
1030         /* fake forced command */
1031         auth_clear_options();
1032         have_forced = buffer_get_int(&m);
1033         forced_command = have_forced ? xstrdup("true") : NULL;
1034
1035         if (allowed && rkey != NULL) {
1036                 blob = buffer_get_string(&m, &blen);
1037                 if ((key = key_from_blob(blob, blen)) == NULL)
1038                         fatal("%s: key_from_blob failed", __func__);
1039                 *rkey = key;
1040                 xfree(blob);
1041         }
1042         mm_send_debug(&m);
1043         buffer_free(&m);
1044
1045         return (allowed);
1046 }
1047
1048 BIGNUM *
1049 mm_auth_rsa_generate_challenge(Key *key)
1050 {
1051         Buffer m;
1052         BIGNUM *challenge;
1053         u_char *blob;
1054         u_int blen;
1055
1056         debug3("%s entering", __func__);
1057
1058         if ((challenge = BN_new()) == NULL)
1059                 fatal("%s: BN_new failed", __func__);
1060
1061         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1062         if (key_to_blob(key, &blob, &blen) == 0)
1063                 fatal("%s: key_to_blob failed", __func__);
1064         key->type = KEY_RSA1;
1065
1066         buffer_init(&m);
1067         buffer_put_string(&m, blob, blen);
1068         xfree(blob);
1069
1070         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
1071         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1072
1073         buffer_get_bignum2(&m, challenge);
1074         buffer_free(&m);
1075
1076         return (challenge);
1077 }
1078
1079 int
1080 mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
1081 {
1082         Buffer m;
1083         u_char *blob;
1084         u_int blen;
1085         int success = 0;
1086
1087         debug3("%s entering", __func__);
1088
1089         key->type = KEY_RSA;    /* XXX cheat for key_to_blob */
1090         if (key_to_blob(key, &blob, &blen) == 0)
1091                 fatal("%s: key_to_blob failed", __func__);
1092         key->type = KEY_RSA1;
1093
1094         buffer_init(&m);
1095         buffer_put_string(&m, blob, blen);
1096         buffer_put_string(&m, response, 16);
1097         xfree(blob);
1098
1099         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
1100         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1101
1102         success = buffer_get_int(&m);
1103         buffer_free(&m);
1104
1105         return (success);
1106 }
1107
1108 #ifdef SSH_AUDIT_EVENTS
1109 void
1110 mm_audit_event(ssh_audit_event_t event)
1111 {
1112         Buffer m;
1113
1114         debug3("%s entering", __func__);
1115
1116         buffer_init(&m);
1117         buffer_put_int(&m, event);
1118
1119         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
1120         buffer_free(&m);
1121 }
1122
1123 void
1124 mm_audit_run_command(const char *command)
1125 {
1126         Buffer m;
1127
1128         debug3("%s entering command %s", __func__, command);
1129
1130         buffer_init(&m);
1131         buffer_put_cstring(&m, command);
1132
1133         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
1134         buffer_free(&m);
1135 }
1136 #endif /* SSH_AUDIT_EVENTS */
1137
1138 #ifdef GSSAPI
1139 OM_uint32
1140 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1141 {
1142         Buffer m;
1143         OM_uint32 major;
1144
1145         /* Client doesn't get to see the context */
1146         *ctx = NULL;
1147
1148         buffer_init(&m);
1149         buffer_put_string(&m, goid->elements, goid->length);
1150
1151         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
1152         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
1153
1154         major = buffer_get_int(&m);
1155
1156         buffer_free(&m);
1157         return (major);
1158 }
1159
1160 OM_uint32
1161 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1162     gss_buffer_desc *out, OM_uint32 *flags)
1163 {
1164         Buffer m;
1165         OM_uint32 major;
1166         u_int len;
1167
1168         buffer_init(&m);
1169         buffer_put_string(&m, in->value, in->length);
1170
1171         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
1172         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
1173
1174         major = buffer_get_int(&m);
1175         out->value = buffer_get_string(&m, &len);
1176         out->length = len;
1177         if (flags)
1178                 *flags = buffer_get_int(&m);
1179
1180         buffer_free(&m);
1181
1182         return (major);
1183 }
1184
1185 OM_uint32
1186 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1187 {
1188         Buffer m;
1189         OM_uint32 major;
1190
1191         buffer_init(&m);
1192         buffer_put_string(&m, gssbuf->value, gssbuf->length);
1193         buffer_put_string(&m, gssmic->value, gssmic->length);
1194
1195         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
1196         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
1197             &m);
1198
1199         major = buffer_get_int(&m);
1200         buffer_free(&m);
1201         return(major);
1202 }
1203
1204 int
1205 mm_ssh_gssapi_userok(char *user)
1206 {
1207         Buffer m;
1208         int authenticated = 0;
1209
1210         buffer_init(&m);
1211
1212         mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
1213         mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
1214                                   &m);
1215
1216         authenticated = buffer_get_int(&m);
1217
1218         buffer_free(&m);
1219         debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
1220         return (authenticated);
1221 }
1222 #endif /* GSSAPI */