1 /* $OpenBSD: monitor_wrap.c,v 1.121 2020/10/18 11:32:01 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_f("no log channel"); 91 92 if ((log_msg = sshbuf_new()) == NULL) 93 fatal_f("sshbuf_new failed"); 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_fr(r, "assemble"); 102 if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff) 103 fatal_f("bad length %zu", 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_f("write: %s", 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_f("entering, type %d", type); 128 129 if (mlen >= 0xffffffff) 130 fatal_f("bad length %zu", 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_f("write: %s", strerror(errno)); 135 if (atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen) 136 fatal_f("write: %s", 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_f("entering"); 147 148 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { 149 if (errno == EPIPE) 150 cleanup_exit(255); 151 fatal_f("read: %s", strerror(errno)); 152 } 153 msg_len = PEEK_U32(buf); 154 if (msg_len > 256 * 1024) 155 fatal_f("read: bad msg_len %d", msg_len); 156 sshbuf_reset(m); 157 if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) 158 fatal_fr(r, "reserve"); 159 if (atomicio(read, sock, p, msg_len) != msg_len) 160 fatal_f("read: %s", 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_f("entering, type %d", type); 170 171 mm_request_receive(sock, m); 172 if ((r = sshbuf_get_u8(m, &rtype)) != 0) 173 fatal_fr(r, "parse"); 174 if (rtype != type) 175 fatal_f("read: rtype %d != type %d", rtype, type); 176 } 177 178 #ifdef WITH_OPENSSL 179 DH * 180 mm_choose_dh(int min, int nbits, int max) 181 { 182 BIGNUM *p, *g; 183 int r; 184 u_char success = 0; 185 struct sshbuf *m; 186 187 if ((m = sshbuf_new()) == NULL) 188 fatal_f("sshbuf_new failed"); 189 if ((r = sshbuf_put_u32(m, min)) != 0 || 190 (r = sshbuf_put_u32(m, nbits)) != 0 || 191 (r = sshbuf_put_u32(m, max)) != 0) 192 fatal_fr(r, "assemble"); 193 194 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m); 195 196 debug3_f("waiting for MONITOR_ANS_MODULI"); 197 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m); 198 199 if ((r = sshbuf_get_u8(m, &success)) != 0) 200 fatal_fr(r, "parse success"); 201 if (success == 0) 202 fatal_f("MONITOR_ANS_MODULI failed"); 203 204 if ((r = sshbuf_get_bignum2(m, &p)) != 0 || 205 (r = sshbuf_get_bignum2(m, &g)) != 0) 206 fatal_fr(r, "parse group"); 207 208 debug3_f("remaining %zu", sshbuf_len(m)); 209 sshbuf_free(m); 210 211 return (dh_new_group(g, p)); 212 } 213 #endif 214 215 int 216 mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp, 217 const u_char *data, size_t datalen, const char *hostkey_alg, 218 const char *sk_provider, const char *sk_pin, u_int compat) 219 { 220 struct kex *kex = *pmonitor->m_pkex; 221 struct sshbuf *m; 222 u_int ndx = kex->host_key_index(key, 0, ssh); 223 int r; 224 225 debug3_f("entering"); 226 if ((m = sshbuf_new()) == NULL) 227 fatal_f("sshbuf_new failed"); 228 if ((r = sshbuf_put_u32(m, ndx)) != 0 || 229 (r = sshbuf_put_string(m, data, datalen)) != 0 || 230 (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 || 231 (r = sshbuf_put_u32(m, compat)) != 0) 232 fatal_fr(r, "assemble"); 233 234 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m); 235 236 debug3_f("waiting for MONITOR_ANS_SIGN"); 237 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m); 238 if ((r = sshbuf_get_string(m, sigp, lenp)) != 0) 239 fatal_fr(r, "parse"); 240 sshbuf_free(m); 241 242 return (0); 243 } 244 245 struct passwd * 246 mm_getpwnamallow(struct ssh *ssh, const char *username) 247 { 248 struct sshbuf *m; 249 struct passwd *pw; 250 size_t len; 251 u_int i; 252 ServerOptions *newopts; 253 int r; 254 u_char ok; 255 const u_char *p; 256 257 debug3_f("entering"); 258 259 if ((m = sshbuf_new()) == NULL) 260 fatal_f("sshbuf_new failed"); 261 if ((r = sshbuf_put_cstring(m, username)) != 0) 262 fatal_fr(r, "assemble"); 263 264 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m); 265 266 debug3_f("waiting for MONITOR_ANS_PWNAM"); 267 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m); 268 269 if ((r = sshbuf_get_u8(m, &ok)) != 0) 270 fatal_fr(r, "parse success"); 271 if (ok == 0) { 272 pw = NULL; 273 goto out; 274 } 275 276 /* XXX don't like passing struct passwd like this */ 277 pw = xcalloc(sizeof(*pw), 1); 278 if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0) 279 fatal_fr(r, "parse"); 280 if (len != sizeof(*pw)) 281 fatal_f("struct passwd size mismatch"); 282 memcpy(pw, p, sizeof(*pw)); 283 284 if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 || 285 (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 || 286 (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 || 287 (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 || 288 (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 || 289 (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0) 290 fatal_fr(r, "parse pw"); 291 292 out: 293 /* copy options block as a Match directive may have changed some */ 294 if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0) 295 fatal_fr(r, "parse opts"); 296 if (len != sizeof(*newopts)) 297 fatal_f("option block size mismatch"); 298 newopts = xcalloc(sizeof(*newopts), 1); 299 memcpy(newopts, p, sizeof(*newopts)); 300 301 #define M_CP_STROPT(x) do { \ 302 if (newopts->x != NULL && \ 303 (r = sshbuf_get_cstring(m, &newopts->x, NULL)) != 0) \ 304 fatal_fr(r, "parse %s", #x); \ 305 } while (0) 306 #define M_CP_STRARRAYOPT(x, nx) do { \ 307 newopts->x = newopts->nx == 0 ? \ 308 NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \ 309 for (i = 0; i < newopts->nx; i++) { \ 310 if ((r = sshbuf_get_cstring(m, \ 311 &newopts->x[i], NULL)) != 0) \ 312 fatal_fr(r, "parse %s", #x); \ 313 } \ 314 } while (0) 315 /* See comment in servconf.h */ 316 COPY_MATCH_STRING_OPTS(); 317 #undef M_CP_STROPT 318 #undef M_CP_STRARRAYOPT 319 320 copy_set_server_options(&options, newopts, 1); 321 log_change_level(options.log_level); 322 log_verbose_reset(); 323 for (i = 0; i < options.num_log_verbose; i++) 324 log_verbose_add(options.log_verbose[i]); 325 process_permitopen(ssh, &options); 326 free(newopts); 327 328 sshbuf_free(m); 329 330 return (pw); 331 } 332 333 char * 334 mm_auth2_read_banner(void) 335 { 336 struct sshbuf *m; 337 char *banner; 338 int r; 339 340 debug3_f("entering"); 341 342 if ((m = sshbuf_new()) == NULL) 343 fatal_f("sshbuf_new failed"); 344 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m); 345 sshbuf_reset(m); 346 347 mm_request_receive_expect(pmonitor->m_recvfd, 348 MONITOR_ANS_AUTH2_READ_BANNER, m); 349 if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0) 350 fatal_fr(r, "parse"); 351 sshbuf_free(m); 352 353 /* treat empty banner as missing banner */ 354 if (strlen(banner) == 0) { 355 free(banner); 356 banner = NULL; 357 } 358 return (banner); 359 } 360 361 /* Inform the privileged process about service and style */ 362 363 void 364 mm_inform_authserv(char *service, char *style) 365 { 366 struct sshbuf *m; 367 int r; 368 369 debug3_f("entering"); 370 371 if ((m = sshbuf_new()) == NULL) 372 fatal_f("sshbuf_new failed"); 373 if ((r = sshbuf_put_cstring(m, service)) != 0 || 374 (r = sshbuf_put_cstring(m, style ? style : "")) != 0) 375 fatal_fr(r, "assemble"); 376 377 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m); 378 379 sshbuf_free(m); 380 } 381 382 /* Do the password authentication */ 383 int 384 mm_auth_password(struct ssh *ssh, char *password) 385 { 386 struct sshbuf *m; 387 int r, authenticated = 0; 388 389 debug3_f("entering"); 390 391 if ((m = sshbuf_new()) == NULL) 392 fatal_f("sshbuf_new failed"); 393 if ((r = sshbuf_put_cstring(m, password)) != 0) 394 fatal_fr(r, "assemble"); 395 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m); 396 397 debug3_f("waiting for MONITOR_ANS_AUTHPASSWORD"); 398 mm_request_receive_expect(pmonitor->m_recvfd, 399 MONITOR_ANS_AUTHPASSWORD, m); 400 401 if ((r = sshbuf_get_u32(m, &authenticated)) != 0) 402 fatal_fr(r, "parse"); 403 404 sshbuf_free(m); 405 406 debug3_f("user %sauthenticated", authenticated ? "" : "not "); 407 return (authenticated); 408 } 409 410 int 411 mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key, 412 int pubkey_auth_attempt, struct sshauthopt **authoptp) 413 { 414 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key, 415 pubkey_auth_attempt, authoptp)); 416 } 417 418 int 419 mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw, 420 const char *user, const char *host, struct sshkey *key) 421 { 422 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL)); 423 } 424 425 int 426 mm_key_allowed(enum mm_keytype type, const char *user, const char *host, 427 struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp) 428 { 429 struct sshbuf *m; 430 int r, allowed = 0; 431 struct sshauthopt *opts = NULL; 432 433 debug3_f("entering"); 434 435 if (authoptp != NULL) 436 *authoptp = NULL; 437 438 if ((m = sshbuf_new()) == NULL) 439 fatal_f("sshbuf_new failed"); 440 if ((r = sshbuf_put_u32(m, type)) != 0 || 441 (r = sshbuf_put_cstring(m, user ? user : "")) != 0 || 442 (r = sshbuf_put_cstring(m, host ? host : "")) != 0 || 443 (r = sshkey_puts(key, m)) != 0 || 444 (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0) 445 fatal_fr(r, "assemble"); 446 447 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m); 448 449 debug3_f("waiting for MONITOR_ANS_KEYALLOWED"); 450 mm_request_receive_expect(pmonitor->m_recvfd, 451 MONITOR_ANS_KEYALLOWED, m); 452 453 if ((r = sshbuf_get_u32(m, &allowed)) != 0) 454 fatal_fr(r, "parse"); 455 if (allowed && type == MM_USERKEY && 456 (r = sshauthopt_deserialise(m, &opts)) != 0) 457 fatal_fr(r, "sshauthopt_deserialise"); 458 sshbuf_free(m); 459 460 if (authoptp != NULL) { 461 *authoptp = opts; 462 opts = NULL; 463 } 464 sshauthopt_free(opts); 465 466 return allowed; 467 } 468 469 /* 470 * This key verify needs to send the key type along, because the 471 * privileged parent makes the decision if the key is allowed 472 * for authentication. 473 */ 474 475 int 476 mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen, 477 const u_char *data, size_t datalen, const char *sigalg, u_int compat, 478 struct sshkey_sig_details **sig_detailsp) 479 { 480 struct sshbuf *m; 481 u_int encoded_ret = 0; 482 int r; 483 u_char sig_details_present, flags; 484 u_int counter; 485 486 debug3_f("entering"); 487 488 if (sig_detailsp != NULL) 489 *sig_detailsp = NULL; 490 if ((m = sshbuf_new()) == NULL) 491 fatal_f("sshbuf_new failed"); 492 if ((r = sshkey_puts(key, m)) != 0 || 493 (r = sshbuf_put_string(m, sig, siglen)) != 0 || 494 (r = sshbuf_put_string(m, data, datalen)) != 0 || 495 (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0) 496 fatal_fr(r, "assemble"); 497 498 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m); 499 500 debug3_f("waiting for MONITOR_ANS_KEYVERIFY"); 501 mm_request_receive_expect(pmonitor->m_recvfd, 502 MONITOR_ANS_KEYVERIFY, m); 503 504 if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 || 505 (r = sshbuf_get_u8(m, &sig_details_present)) != 0) 506 fatal_fr(r, "parse"); 507 if (sig_details_present && encoded_ret == 0) { 508 if ((r = sshbuf_get_u32(m, &counter)) != 0 || 509 (r = sshbuf_get_u8(m, &flags)) != 0) 510 fatal_fr(r, "parse sig_details"); 511 if (sig_detailsp != NULL) { 512 *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp)); 513 (*sig_detailsp)->sk_counter = counter; 514 (*sig_detailsp)->sk_flags = flags; 515 } 516 } 517 518 sshbuf_free(m); 519 520 if (encoded_ret != 0) 521 return SSH_ERR_SIGNATURE_INVALID; 522 return 0; 523 } 524 525 void 526 mm_send_keystate(struct ssh *ssh, struct monitor *monitor) 527 { 528 struct sshbuf *m; 529 int r; 530 531 if ((m = sshbuf_new()) == NULL) 532 fatal_f("sshbuf_new failed"); 533 if ((r = ssh_packet_get_state(ssh, m)) != 0) 534 fatal_fr(r, "ssh_packet_get_state"); 535 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m); 536 debug3_f("Finished sending state"); 537 sshbuf_free(m); 538 } 539 540 int 541 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) 542 { 543 struct sshbuf *m; 544 char *p, *msg; 545 int success = 0, tmp1 = -1, tmp2 = -1, r; 546 547 /* Kludge: ensure there are fds free to receive the pty/tty */ 548 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || 549 (tmp2 = dup(pmonitor->m_recvfd)) == -1) { 550 error_f("cannot allocate fds for pty"); 551 if (tmp1 > 0) 552 close(tmp1); 553 if (tmp2 > 0) 554 close(tmp2); 555 return 0; 556 } 557 close(tmp1); 558 close(tmp2); 559 560 if ((m = sshbuf_new()) == NULL) 561 fatal_f("sshbuf_new failed"); 562 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m); 563 564 debug3_f("waiting for MONITOR_ANS_PTY"); 565 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m); 566 567 if ((r = sshbuf_get_u32(m, &success)) != 0) 568 fatal_fr(r, "parse success"); 569 if (success == 0) { 570 debug3_f("pty alloc failed"); 571 sshbuf_free(m); 572 return (0); 573 } 574 if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 || 575 (r = sshbuf_get_cstring(m, &msg, NULL)) != 0) 576 fatal_fr(r, "parse"); 577 sshbuf_free(m); 578 579 strlcpy(namebuf, p, namebuflen); /* Possible truncation */ 580 free(p); 581 582 if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0) 583 fatal_fr(r, "put loginmsg"); 584 free(msg); 585 586 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || 587 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) 588 fatal_f("receive fds failed"); 589 590 /* Success */ 591 return (1); 592 } 593 594 void 595 mm_session_pty_cleanup2(Session *s) 596 { 597 struct sshbuf *m; 598 int r; 599 600 if (s->ttyfd == -1) 601 return; 602 if ((m = sshbuf_new()) == NULL) 603 fatal_f("sshbuf_new failed"); 604 if ((r = sshbuf_put_cstring(m, s->tty)) != 0) 605 fatal_fr(r, "assmble"); 606 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m); 607 sshbuf_free(m); 608 609 /* closed dup'ed master */ 610 if (s->ptymaster != -1 && close(s->ptymaster) == -1) 611 error("close(s->ptymaster/%d): %s", 612 s->ptymaster, strerror(errno)); 613 614 /* unlink pty from session */ 615 s->ttyfd = -1; 616 } 617 618 /* Request process termination */ 619 620 void 621 mm_terminate(void) 622 { 623 struct sshbuf *m; 624 625 if ((m = sshbuf_new()) == NULL) 626 fatal_f("sshbuf_new failed"); 627 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m); 628 sshbuf_free(m); 629 } 630 631 static void 632 mm_chall_setup(char **name, char **infotxt, u_int *numprompts, 633 char ***prompts, u_int **echo_on) 634 { 635 *name = xstrdup(""); 636 *infotxt = xstrdup(""); 637 *numprompts = 1; 638 *prompts = xcalloc(*numprompts, sizeof(char *)); 639 *echo_on = xcalloc(*numprompts, sizeof(u_int)); 640 (*echo_on)[0] = 0; 641 } 642 643 int 644 mm_bsdauth_query(void *ctx, char **name, char **infotxt, 645 u_int *numprompts, char ***prompts, u_int **echo_on) 646 { 647 struct sshbuf *m; 648 u_int success; 649 char *challenge; 650 int r; 651 652 debug3_f("entering"); 653 654 if ((m = sshbuf_new()) == NULL) 655 fatal_f("sshbuf_new failed"); 656 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m); 657 658 mm_request_receive_expect(pmonitor->m_recvfd, 659 MONITOR_ANS_BSDAUTHQUERY, m); 660 if ((r = sshbuf_get_u32(m, &success)) != 0) 661 fatal_fr(r, "parse success"); 662 if (success == 0) { 663 debug3_f("no challenge"); 664 sshbuf_free(m); 665 return (-1); 666 } 667 668 /* Get the challenge, and format the response */ 669 if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0) 670 fatal_fr(r, "parse challenge"); 671 sshbuf_free(m); 672 673 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); 674 (*prompts)[0] = challenge; 675 676 debug3_f("received challenge: %s", challenge); 677 678 return (0); 679 } 680 681 int 682 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) 683 { 684 struct sshbuf *m; 685 int r, authok; 686 687 debug3_f("entering"); 688 if (numresponses != 1) 689 return (-1); 690 691 if ((m = sshbuf_new()) == NULL) 692 fatal_f("sshbuf_new failed"); 693 if ((r = sshbuf_put_cstring(m, responses[0])) != 0) 694 fatal_fr(r, "assemble"); 695 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m); 696 697 mm_request_receive_expect(pmonitor->m_recvfd, 698 MONITOR_ANS_BSDAUTHRESPOND, m); 699 700 if ((r = sshbuf_get_u32(m, &authok)) != 0) 701 fatal_fr(r, "parse"); 702 sshbuf_free(m); 703 704 return ((authok == 0) ? -1 : 0); 705 } 706 707 #ifdef GSSAPI 708 OM_uint32 709 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) 710 { 711 struct sshbuf *m; 712 OM_uint32 major; 713 int r; 714 715 /* Client doesn't get to see the context */ 716 *ctx = NULL; 717 718 if ((m = sshbuf_new()) == NULL) 719 fatal_f("sshbuf_new failed"); 720 if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0) 721 fatal_fr(r, "assemble"); 722 723 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m); 724 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m); 725 726 if ((r = sshbuf_get_u32(m, &major)) != 0) 727 fatal_fr(r, "parse"); 728 729 sshbuf_free(m); 730 return (major); 731 } 732 733 OM_uint32 734 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, 735 gss_buffer_desc *out, OM_uint32 *flagsp) 736 { 737 struct sshbuf *m; 738 OM_uint32 major; 739 u_int flags; 740 int r; 741 742 if ((m = sshbuf_new()) == NULL) 743 fatal_f("sshbuf_new failed"); 744 if ((r = sshbuf_put_string(m, in->value, in->length)) != 0) 745 fatal_fr(r, "assemble"); 746 747 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m); 748 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m); 749 750 if ((r = sshbuf_get_u32(m, &major)) != 0 || 751 (r = ssh_gssapi_get_buffer_desc(m, out)) != 0) 752 fatal_fr(r, "parse"); 753 if (flagsp != NULL) { 754 if ((r = sshbuf_get_u32(m, &flags)) != 0) 755 fatal_fr(r, "parse flags"); 756 *flagsp = flags; 757 } 758 759 sshbuf_free(m); 760 761 return (major); 762 } 763 764 OM_uint32 765 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) 766 { 767 struct sshbuf *m; 768 OM_uint32 major; 769 int r; 770 771 if ((m = sshbuf_new()) == NULL) 772 fatal_f("sshbuf_new failed"); 773 if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 || 774 (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0) 775 fatal_fr(r, "assemble"); 776 777 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m); 778 mm_request_receive_expect(pmonitor->m_recvfd, 779 MONITOR_ANS_GSSCHECKMIC, m); 780 781 if ((r = sshbuf_get_u32(m, &major)) != 0) 782 fatal_fr(r, "parse"); 783 sshbuf_free(m); 784 return(major); 785 } 786 787 int 788 mm_ssh_gssapi_userok(char *user) 789 { 790 struct sshbuf *m; 791 int r, authenticated = 0; 792 793 if ((m = sshbuf_new()) == NULL) 794 fatal_f("sshbuf_new failed"); 795 796 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m); 797 mm_request_receive_expect(pmonitor->m_recvfd, 798 MONITOR_ANS_GSSUSEROK, m); 799 800 if ((r = sshbuf_get_u32(m, &authenticated)) != 0) 801 fatal_fr(r, "parse"); 802 803 sshbuf_free(m); 804 debug3_f("user %sauthenticated", authenticated ? "" : "not "); 805 return (authenticated); 806 } 807 #endif /* GSSAPI */ 808