1 /* $OpenBSD: monitor_wrap.c,v 1.120 2020/10/16 13:26:13 djm 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 <sys/types.h> 29 #include <sys/uio.h> 30 #include <sys/queue.h> 31 32 #include <errno.h> 33 #include <pwd.h> 34 #include <signal.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <stdarg.h> 38 #include <unistd.h> 39 40 #ifdef WITH_OPENSSL 41 #include <openssl/bn.h> 42 #include <openssl/dh.h> 43 #endif 44 45 #include "xmalloc.h" 46 #include "ssh.h" 47 #ifdef WITH_OPENSSL 48 #include "dh.h" 49 #endif 50 #include "sshbuf.h" 51 #include "sshkey.h" 52 #include "cipher.h" 53 #include "kex.h" 54 #include "hostfile.h" 55 #include "auth.h" 56 #include "auth-options.h" 57 #include "packet.h" 58 #include "mac.h" 59 #include "log.h" 60 #include "monitor.h" 61 #ifdef GSSAPI 62 #include "ssh-gss.h" 63 #endif 64 #include "monitor_wrap.h" 65 #include "atomicio.h" 66 #include "monitor_fdpass.h" 67 #include "misc.h" 68 69 #include "channels.h" 70 #include "session.h" 71 #include "servconf.h" 72 73 #include "ssherr.h" 74 75 /* Imports */ 76 extern struct monitor *pmonitor; 77 extern struct sshbuf *loginmsg; 78 extern ServerOptions options; 79 80 void 81 mm_log_handler(const char *file, const char *func, int line, 82 LogLevel level, const char *msg, void *ctx) 83 { 84 struct sshbuf *log_msg; 85 struct monitor *mon = (struct monitor *)ctx; 86 int r; 87 size_t len; 88 89 if (mon->m_log_sendfd == -1) 90 fatal("%s: no log channel", __func__); 91 92 if ((log_msg = sshbuf_new()) == NULL) 93 fatal("%s: sshbuf_new failed", __func__); 94 95 if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */ 96 (r = sshbuf_put_cstring(log_msg, file)) != 0 || 97 (r = sshbuf_put_cstring(log_msg, func)) != 0 || 98 (r = sshbuf_put_u32(log_msg, (u_int)line)) != 0 || 99 (r = sshbuf_put_u32(log_msg, level)) != 0 || 100 (r = sshbuf_put_cstring(log_msg, msg)) != 0) 101 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 102 if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff) 103 fatal("%s: bad length %zu", __func__, len); 104 POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4); 105 if (atomicio(vwrite, mon->m_log_sendfd, 106 sshbuf_mutable_ptr(log_msg), len) != len) 107 fatal("%s: write: %s", __func__, strerror(errno)); 108 sshbuf_free(log_msg); 109 } 110 111 int 112 mm_is_monitor(void) 113 { 114 /* 115 * m_pid is only set in the privileged part, and 116 * points to the unprivileged child. 117 */ 118 return (pmonitor && pmonitor->m_pid > 0); 119 } 120 121 void 122 mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m) 123 { 124 size_t mlen = sshbuf_len(m); 125 u_char buf[5]; 126 127 debug3("%s entering: type %d", __func__, type); 128 129 if (mlen >= 0xffffffff) 130 fatal("%s: bad length %zu", __func__, mlen); 131 POKE_U32(buf, mlen + 1); 132 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ 133 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) 134 fatal("%s: write: %s", __func__, strerror(errno)); 135 if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen) 136 fatal("%s: write: %s", __func__, strerror(errno)); 137 } 138 139 void 140 mm_request_receive(int sock, struct sshbuf *m) 141 { 142 u_char buf[4], *p = NULL; 143 u_int msg_len; 144 int r; 145 146 debug3("%s entering", __func__); 147 148 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 149 if (errno == EPIPE) 150 cleanup_exit(255); 151 fatal("%s: read: %s", __func__, strerror(errno)); 152 } 153 msg_len = PEEK_U32(buf); 154 if (msg_len > 256 * 1024) 155 fatal("%s: read: bad msg_len %d", __func__, msg_len); 156 sshbuf_reset(m); 157 if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) 158 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 159 if (atomicio(read, sock, p, msg_len) != msg_len) 160 fatal("%s: read: %s", __func__, strerror(errno)); 161 } 162 163 void 164 mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m) 165 { 166 u_char rtype; 167 int r; 168 169 debug3("%s entering: type %d", __func__, type); 170 171 mm_request_receive(sock, m); 172 if ((r = sshbuf_get_u8(m, &rtype)) != 0) 173 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 174 if (rtype != type) 175 fatal("%s: read: rtype %d != type %d", __func__, 176 rtype, type); 177 } 178 179 #ifdef WITH_OPENSSL 180 DH * 181 mm_choose_dh(int min, int nbits, int max) 182 { 183 BIGNUM *p, *g; 184 int r; 185 u_char success = 0; 186 struct sshbuf *m; 187 188 if ((m = sshbuf_new()) == NULL) 189 fatal("%s: sshbuf_new failed", __func__); 190 if ((r = sshbuf_put_u32(m, min)) != 0 || 191 (r = sshbuf_put_u32(m, nbits)) != 0 || 192 (r = sshbuf_put_u32(m, max)) != 0) 193 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 194 195 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m); 196 197 debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); 198 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m); 199 200 if ((r = sshbuf_get_u8(m, &success)) != 0) 201 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 202 if (success == 0) 203 fatal("%s: MONITOR_ANS_MODULI failed", __func__); 204 205 if ((r = sshbuf_get_bignum2(m, &p)) != 0 || 206 (r = sshbuf_get_bignum2(m, &g)) != 0) 207 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 208 209 debug3("%s: remaining %zu", __func__, sshbuf_len(m)); 210 sshbuf_free(m); 211 212 return (dh_new_group(g, p)); 213 } 214 #endif 215 216 int 217 mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp, 218 const u_char *data, size_t datalen, const char *hostkey_alg, 219 const char *sk_provider, const char *sk_pin, u_int compat) 220 { 221 struct kex *kex = *pmonitor->m_pkex; 222 struct sshbuf *m; 223 u_int ndx = kex->host_key_index(key, 0, ssh); 224 int r; 225 226 debug3("%s entering", __func__); 227 if ((m = sshbuf_new()) == NULL) 228 fatal("%s: sshbuf_new failed", __func__); 229 if ((r = sshbuf_put_u32(m, ndx)) != 0 || 230 (r = sshbuf_put_string(m, data, datalen)) != 0 || 231 (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 || 232 (r = sshbuf_put_u32(m, compat)) != 0) 233 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 234 235 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m); 236 237 debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); 238 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m); 239 if ((r = sshbuf_get_string(m, sigp, lenp)) != 0) 240 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 241 sshbuf_free(m); 242 243 return (0); 244 } 245 246 struct passwd * 247 mm_getpwnamallow(struct ssh *ssh, const char *username) 248 { 249 struct sshbuf *m; 250 struct passwd *pw; 251 size_t len; 252 u_int i; 253 ServerOptions *newopts; 254 int r; 255 u_char ok; 256 const u_char *p; 257 258 debug3("%s entering", __func__); 259 260 if ((m = sshbuf_new()) == NULL) 261 fatal("%s: sshbuf_new failed", __func__); 262 if ((r = sshbuf_put_cstring(m, username)) != 0) 263 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 264 265 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m); 266 267 debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); 268 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m); 269 270 if ((r = sshbuf_get_u8(m, &ok)) != 0) 271 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 272 if (ok == 0) { 273 pw = NULL; 274 goto out; 275 } 276 277 /* XXX don't like passing struct passwd like this */ 278 pw = xcalloc(sizeof(*pw), 1); 279 if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0) 280 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 281 if (len != sizeof(*pw)) 282 fatal("%s: struct passwd size mismatch", __func__); 283 memcpy(pw, p, sizeof(*pw)); 284 285 if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 || 286 (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 || 287 (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 || 288 (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 || 289 (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 || 290 (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0) 291 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 292 293 out: 294 /* copy options block as a Match directive may have changed some */ 295 if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0) 296 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 297 if (len != sizeof(*newopts)) 298 fatal("%s: option block size mismatch", __func__); 299 newopts = xcalloc(sizeof(*newopts), 1); 300 memcpy(newopts, p, sizeof(*newopts)); 301 302 #define M_CP_STROPT(x) do { \ 303 if (newopts->x != NULL) { \ 304 if ((r = sshbuf_get_cstring(m, \ 305 &newopts->x, NULL)) != 0) \ 306 fatal("%s: buffer error: %s", \ 307 __func__, ssh_err(r)); \ 308 } \ 309 } while (0) 310 #define M_CP_STRARRAYOPT(x, nx) do { \ 311 newopts->x = newopts->nx == 0 ? \ 312 NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \ 313 for (i = 0; i < newopts->nx; i++) { \ 314 if ((r = sshbuf_get_cstring(m, \ 315 &newopts->x[i], NULL)) != 0) \ 316 fatal("%s: buffer error: %s", \ 317 __func__, ssh_err(r)); \ 318 } \ 319 } while (0) 320 /* See comment in servconf.h */ 321 COPY_MATCH_STRING_OPTS(); 322 #undef M_CP_STROPT 323 #undef M_CP_STRARRAYOPT 324 325 copy_set_server_options(&options, newopts, 1); 326 log_change_level(options.log_level); 327 log_verbose_reset(); 328 for (i = 0; i < options.num_log_verbose; i++) 329 log_verbose_add(options.log_verbose[i]); 330 process_permitopen(ssh, &options); 331 free(newopts); 332 333 sshbuf_free(m); 334 335 return (pw); 336 } 337 338 char * 339 mm_auth2_read_banner(void) 340 { 341 struct sshbuf *m; 342 char *banner; 343 int r; 344 345 debug3("%s entering", __func__); 346 347 if ((m = sshbuf_new()) == NULL) 348 fatal("%s: sshbuf_new failed", __func__); 349 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m); 350 sshbuf_reset(m); 351 352 mm_request_receive_expect(pmonitor->m_recvfd, 353 MONITOR_ANS_AUTH2_READ_BANNER, m); 354 if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0) 355 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 356 sshbuf_free(m); 357 358 /* treat empty banner as missing banner */ 359 if (strlen(banner) == 0) { 360 free(banner); 361 banner = NULL; 362 } 363 return (banner); 364 } 365 366 /* Inform the privileged process about service and style */ 367 368 void 369 mm_inform_authserv(char *service, char *style) 370 { 371 struct sshbuf *m; 372 int r; 373 374 debug3("%s entering", __func__); 375 376 if ((m = sshbuf_new()) == NULL) 377 fatal("%s: sshbuf_new failed", __func__); 378 if ((r = sshbuf_put_cstring(m, service)) != 0 || 379 (r = sshbuf_put_cstring(m, style ? style : "")) != 0) 380 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 381 382 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m); 383 384 sshbuf_free(m); 385 } 386 387 /* Do the password authentication */ 388 int 389 mm_auth_password(struct ssh *ssh, char *password) 390 { 391 struct sshbuf *m; 392 int r, authenticated = 0; 393 394 debug3("%s entering", __func__); 395 396 if ((m = sshbuf_new()) == NULL) 397 fatal("%s: sshbuf_new failed", __func__); 398 if ((r = sshbuf_put_cstring(m, password)) != 0) 399 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 400 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m); 401 402 debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); 403 mm_request_receive_expect(pmonitor->m_recvfd, 404 MONITOR_ANS_AUTHPASSWORD, m); 405 406 if ((r = sshbuf_get_u32(m, &authenticated)) != 0) 407 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 408 409 sshbuf_free(m); 410 411 debug3("%s: user %sauthenticated", 412 __func__, authenticated ? "" : "not "); 413 return (authenticated); 414 } 415 416 int 417 mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key, 418 int pubkey_auth_attempt, struct sshauthopt **authoptp) 419 { 420 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, 421 pubkey_auth_attempt, authoptp)); 422 } 423 424 int 425 mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw, 426 const char *user, const char *host, struct sshkey *key) 427 { 428 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL)); 429 } 430 431 int 432 mm_key_allowed(enum mm_keytype type, const char *user, const char *host, 433 struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp) 434 { 435 struct sshbuf *m; 436 int r, allowed = 0; 437 struct sshauthopt *opts = NULL; 438 439 debug3("%s entering", __func__); 440 441 if (authoptp != NULL) 442 *authoptp = NULL; 443 444 if ((m = sshbuf_new()) == NULL) 445 fatal("%s: sshbuf_new failed", __func__); 446 if ((r = sshbuf_put_u32(m, type)) != 0 || 447 (r = sshbuf_put_cstring(m, user ? user : "")) != 0 || 448 (r = sshbuf_put_cstring(m, host ? host : "")) != 0 || 449 (r = sshkey_puts(key, m)) != 0 || 450 (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0) 451 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 452 453 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m); 454 455 debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); 456 mm_request_receive_expect(pmonitor->m_recvfd, 457 MONITOR_ANS_KEYALLOWED, m); 458 459 if ((r = sshbuf_get_u32(m, &allowed)) != 0) 460 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 461 if (allowed && type == MM_USERKEY) { 462 if ((r = sshauthopt_deserialise(m, &opts)) != 0) 463 fatal("%s: sshauthopt_deserialise: %s", 464 __func__, ssh_err(r)); 465 } 466 sshbuf_free(m); 467 468 if (authoptp != NULL) { 469 *authoptp = opts; 470 opts = NULL; 471 } 472 sshauthopt_free(opts); 473 474 return allowed; 475 } 476 477 /* 478 * This key verify needs to send the key type along, because the 479 * privileged parent makes the decision if the key is allowed 480 * for authentication. 481 */ 482 483 int 484 mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen, 485 const u_char *data, size_t datalen, const char *sigalg, u_int compat, 486 struct sshkey_sig_details **sig_detailsp) 487 { 488 struct sshbuf *m; 489 u_int encoded_ret = 0; 490 int r; 491 u_char sig_details_present, flags; 492 u_int counter; 493 494 debug3("%s entering", __func__); 495 496 if (sig_detailsp != NULL) 497 *sig_detailsp = NULL; 498 if ((m = sshbuf_new()) == NULL) 499 fatal("%s: sshbuf_new failed", __func__); 500 if ((r = sshkey_puts(key, m)) != 0 || 501 (r = sshbuf_put_string(m, sig, siglen)) != 0 || 502 (r = sshbuf_put_string(m, data, datalen)) != 0 || 503 (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0) 504 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 505 506 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m); 507 508 debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); 509 mm_request_receive_expect(pmonitor->m_recvfd, 510 MONITOR_ANS_KEYVERIFY, m); 511 512 if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 || 513 (r = sshbuf_get_u8(m, &sig_details_present)) != 0) 514 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 515 if (sig_details_present && encoded_ret == 0) { 516 if ((r = sshbuf_get_u32(m, &counter)) != 0 || 517 (r = sshbuf_get_u8(m, &flags)) != 0) 518 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 519 if (sig_detailsp != NULL) { 520 *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp)); 521 (*sig_detailsp)->sk_counter = counter; 522 (*sig_detailsp)->sk_flags = flags; 523 } 524 } 525 526 sshbuf_free(m); 527 528 if (encoded_ret != 0) 529 return SSH_ERR_SIGNATURE_INVALID; 530 return 0; 531 } 532 533 void 534 mm_send_keystate(struct ssh *ssh, struct monitor *monitor) 535 { 536 struct sshbuf *m; 537 int r; 538 539 if ((m = sshbuf_new()) == NULL) 540 fatal("%s: sshbuf_new failed", __func__); 541 if ((r = ssh_packet_get_state(ssh, m)) != 0) 542 fatal("%s: get_state failed: %s", 543 __func__, ssh_err(r)); 544 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); 545 debug3("%s: Finished sending state", __func__); 546 sshbuf_free(m); 547 } 548 549 int 550 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 551 { 552 struct sshbuf *m; 553 char *p, *msg; 554 int success = 0, tmp1 = -1, tmp2 = -1, r; 555 556 /* Kludge: ensure there are fds free to receive the pty/tty */ 557 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 558 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 559 error("%s: cannot allocate fds for pty", __func__); 560 if (tmp1 > 0) 561 close(tmp1); 562 if (tmp2 > 0) 563 close(tmp2); 564 return 0; 565 } 566 close(tmp1); 567 close(tmp2); 568 569 if ((m = sshbuf_new()) == NULL) 570 fatal("%s: sshbuf_new failed", __func__); 571 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m); 572 573 debug3("%s: waiting for MONITOR_ANS_PTY", __func__); 574 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m); 575 576 if ((r = sshbuf_get_u32(m, &success)) != 0) 577 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 578 if (success == 0) { 579 debug3("%s: pty alloc failed", __func__); 580 sshbuf_free(m); 581 return (0); 582 } 583 if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 || 584 (r = sshbuf_get_cstring(m, &msg, NULL)) != 0) 585 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 586 sshbuf_free(m); 587 588 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 589 free(p); 590 591 if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0) 592 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 593 free(msg); 594 595 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 596 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 597 fatal("%s: receive fds failed", __func__); 598 599 /* Success */ 600 return (1); 601 } 602 603 void 604 mm_session_pty_cleanup2(Session *s) 605 { 606 struct sshbuf *m; 607 int r; 608 609 if (s->ttyfd == -1) 610 return; 611 if ((m = sshbuf_new()) == NULL) 612 fatal("%s: sshbuf_new failed", __func__); 613 if ((r = sshbuf_put_cstring(m, s->tty)) != 0) 614 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 615 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m); 616 sshbuf_free(m); 617 618 /* closed dup'ed master */ 619 if (s->ptymaster != -1 && close(s->ptymaster) == -1) 620 error("close(s->ptymaster/%d): %s", 621 s->ptymaster, strerror(errno)); 622 623 /* unlink pty from session */ 624 s->ttyfd = -1; 625 } 626 627 /* Request process termination */ 628 629 void 630 mm_terminate(void) 631 { 632 struct sshbuf *m; 633 634 if ((m = sshbuf_new()) == NULL) 635 fatal("%s: sshbuf_new failed", __func__); 636 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m); 637 sshbuf_free(m); 638 } 639 640 static void 641 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 642 char ***prompts, u_int **echo_on) 643 { 644 *name = xstrdup(""); 645 *infotxt = xstrdup(""); 646 *numprompts = 1; 647 *prompts = xcalloc(*numprompts, sizeof(char *)); 648 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 649 (*echo_on)[0] = 0; 650 } 651 652 int 653 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 654 u_int *numprompts, char ***prompts, u_int **echo_on) 655 { 656 struct sshbuf *m; 657 u_int success; 658 char *challenge; 659 int r; 660 661 debug3("%s: entering", __func__); 662 663 if ((m = sshbuf_new()) == NULL) 664 fatal("%s: sshbuf_new failed", __func__); 665 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m); 666 667 mm_request_receive_expect(pmonitor->m_recvfd, 668 MONITOR_ANS_BSDAUTHQUERY, m); 669 if ((r = sshbuf_get_u32(m, &success)) != 0) 670 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 671 if (success == 0) { 672 debug3("%s: no challenge", __func__); 673 sshbuf_free(m); 674 return (-1); 675 } 676 677 /* Get the challenge, and format the response */ 678 if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0) 679 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 680 sshbuf_free(m); 681 682 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 683 (*prompts)[0] = challenge; 684 685 debug3("%s: received challenge: %s", __func__, challenge); 686 687 return (0); 688 } 689 690 int 691 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 692 { 693 struct sshbuf *m; 694 int r, authok; 695 696 debug3("%s: entering", __func__); 697 if (numresponses != 1) 698 return (-1); 699 700 if ((m = sshbuf_new()) == NULL) 701 fatal("%s: sshbuf_new failed", __func__); 702 if ((r = sshbuf_put_cstring(m, responses[0])) != 0) 703 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 704 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m); 705 706 mm_request_receive_expect(pmonitor->m_recvfd, 707 MONITOR_ANS_BSDAUTHRESPOND, m); 708 709 if ((r = sshbuf_get_u32(m, &authok)) != 0) 710 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 711 sshbuf_free(m); 712 713 return ((authok == 0) ? -1 : 0); 714 } 715 716 #ifdef GSSAPI 717 OM_uint32 718 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 719 { 720 struct sshbuf *m; 721 OM_uint32 major; 722 int r; 723 724 /* Client doesn't get to see the context */ 725 *ctx = NULL; 726 727 if ((m = sshbuf_new()) == NULL) 728 fatal("%s: sshbuf_new failed", __func__); 729 if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0) 730 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 731 732 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m); 733 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m); 734 735 if ((r = sshbuf_get_u32(m, &major)) != 0) 736 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 737 738 sshbuf_free(m); 739 return (major); 740 } 741 742 OM_uint32 743 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 744 gss_buffer_desc *out, OM_uint32 *flagsp) 745 { 746 struct sshbuf *m; 747 OM_uint32 major; 748 u_int flags; 749 int r; 750 751 if ((m = sshbuf_new()) == NULL) 752 fatal("%s: sshbuf_new failed", __func__); 753 if ((r = sshbuf_put_string(m, in->value, in->length)) != 0) 754 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 755 756 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m); 757 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m); 758 759 if ((r = sshbuf_get_u32(m, &major)) != 0 || 760 (r = ssh_gssapi_get_buffer_desc(m, out)) != 0) 761 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 762 if (flagsp != NULL) { 763 if ((r = sshbuf_get_u32(m, &flags)) != 0) 764 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 765 *flagsp = flags; 766 } 767 768 sshbuf_free(m); 769 770 return (major); 771 } 772 773 OM_uint32 774 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 775 { 776 struct sshbuf *m; 777 OM_uint32 major; 778 int r; 779 780 if ((m = sshbuf_new()) == NULL) 781 fatal("%s: sshbuf_new failed", __func__); 782 if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 || 783 (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0) 784 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 785 786 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m); 787 mm_request_receive_expect(pmonitor->m_recvfd, 788 MONITOR_ANS_GSSCHECKMIC, m); 789 790 if ((r = sshbuf_get_u32(m, &major)) != 0) 791 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 792 sshbuf_free(m); 793 return(major); 794 } 795 796 int 797 mm_ssh_gssapi_userok(char *user) 798 { 799 struct sshbuf *m; 800 int r, authenticated = 0; 801 802 if ((m = sshbuf_new()) == NULL) 803 fatal("%s: sshbuf_new failed", __func__); 804 805 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m); 806 mm_request_receive_expect(pmonitor->m_recvfd, 807 MONITOR_ANS_GSSUSEROK, m); 808 809 if ((r = sshbuf_get_u32(m, &authenticated)) != 0) 810 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 811 812 sshbuf_free(m); 813 debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); 814 return (authenticated); 815 } 816 #endif /* GSSAPI */ 817