San Mehat | a430b2b | 2014-09-23 08:30:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | Copyright (C) 2002-2010 Karl J. Runge <runge@karlrunge.com> |
| 3 | All rights reserved. |
| 4 | |
| 5 | This file is part of x11vnc. |
| 6 | |
| 7 | x11vnc is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or (at |
| 10 | your option) any later version. |
| 11 | |
| 12 | x11vnc is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with x11vnc; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA |
| 20 | or see <http://www.gnu.org/licenses/>. |
| 21 | |
| 22 | In addition, as a special exception, Karl J. Runge |
| 23 | gives permission to link the code of its release of x11vnc with the |
| 24 | OpenSSL project's "OpenSSL" library (or with modified versions of it |
| 25 | that use the same license as the "OpenSSL" library), and distribute |
| 26 | the linked executables. You must obey the GNU General Public License |
| 27 | in all respects for all of the code used other than "OpenSSL". If you |
| 28 | modify this file, you may extend this exception to your version of the |
| 29 | file, but you are not obligated to do so. If you do not wish to do |
| 30 | so, delete this exception statement from your version. |
| 31 | */ |
| 32 | |
| 33 | /* -- sslhelper.c -- */ |
| 34 | |
| 35 | #include "x11vnc.h" |
| 36 | #include "inet.h" |
| 37 | #include "cleanup.h" |
| 38 | #include "screen.h" |
| 39 | #include "scan.h" |
| 40 | #include "connections.h" |
| 41 | #include "sslcmds.h" |
| 42 | #include "unixpw.h" |
| 43 | #include "user.h" |
| 44 | |
| 45 | #define OPENSSL_INETD 1 |
| 46 | #define OPENSSL_VNC 2 |
| 47 | #define OPENSSL_VNC6 3 |
| 48 | #define OPENSSL_HTTPS 4 |
| 49 | #define OPENSSL_HTTPS6 5 |
| 50 | #define OPENSSL_REVERSE 6 |
| 51 | |
| 52 | #define DO_DH 0 |
| 53 | |
| 54 | #if LIBVNCSERVER_HAVE_FORK |
| 55 | #if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID |
| 56 | #define FORK_OK |
| 57 | #endif |
| 58 | #endif |
| 59 | |
| 60 | int openssl_sock = -1; |
| 61 | int openssl_sock6 = -1; |
| 62 | int openssl_port_num = 0; |
| 63 | int https_sock = -1; |
| 64 | int https_sock6 = -1; |
| 65 | pid_t openssl_last_helper_pid = 0; |
| 66 | char *openssl_last_ip = NULL; |
| 67 | |
| 68 | static char *certret = NULL; |
| 69 | static int certret_fd = -1; |
| 70 | static mode_t omode; |
| 71 | char *certret_str = NULL; |
| 72 | |
| 73 | static char *dhret = NULL; |
| 74 | static int dhret_fd = -1; |
| 75 | char *dhret_str = NULL; |
| 76 | char *new_dh_params = NULL; |
| 77 | |
| 78 | void raw_xfer(int csock, int s_in, int s_out); |
| 79 | |
| 80 | /* openssl(1) pem related functions: */ |
| 81 | char *get_saved_pem(char *string, int create); |
| 82 | char *find_openssl_bin(void); |
| 83 | char *get_ssl_verify_file(char *str_in); |
| 84 | char *create_tmp_pem(char *path, int prompt); |
| 85 | |
| 86 | static char *get_input(char *tag, char **in); |
| 87 | |
| 88 | char *get_saved_pem(char *save, int create) { |
| 89 | char *s = NULL, *path, *cdir, *tmp; |
| 90 | int prompt = 0, len; |
| 91 | struct stat sbuf; |
| 92 | |
| 93 | if (! save) { |
| 94 | rfbLog("get_saved_pem: save string is null.\n"); |
| 95 | clean_up_exit(1); |
| 96 | } |
| 97 | |
| 98 | if (strstr(save, "SAVE_PROMPT") == save) { |
| 99 | prompt = 1; |
| 100 | s = save + strlen("SAVE_PROMPT"); |
| 101 | } else if (strstr(save, "SAVE_NOPROMPT") == save) { |
| 102 | set_env("GENCERT_NOPROMPT", "1"); |
| 103 | s = save + strlen("SAVE_NOPROMPT"); |
| 104 | } else if (strstr(save, "SAVE") == save) { |
| 105 | s = save + strlen("SAVE"); |
| 106 | } else { |
| 107 | rfbLog("get_saved_pem: invalid save string: %s\n", save); |
| 108 | clean_up_exit(1); |
| 109 | } |
| 110 | if (strchr(s, '/')) { |
| 111 | rfbLog("get_saved_pem: invalid save string: %s\n", s); |
| 112 | clean_up_exit(1); |
| 113 | } |
| 114 | |
| 115 | |
| 116 | cdir = get_Cert_dir(NULL, &tmp); |
| 117 | if (! cdir || ! tmp) { |
| 118 | rfbLog("get_saved_pem: could not find Cert dir.\n"); |
| 119 | clean_up_exit(1); |
| 120 | } |
| 121 | |
| 122 | len = strlen(cdir) + strlen("/server.pem") + strlen(s) + 1; |
| 123 | |
| 124 | path = (char *) malloc(len); |
| 125 | sprintf(path, "%s/server%s.pem", cdir, s); |
| 126 | |
| 127 | if (stat(path, &sbuf) != 0) { |
| 128 | char *new_name = NULL; |
| 129 | if (create) { |
| 130 | if (inetd || opts_bg) { |
| 131 | set_env("GENCERT_NOPROMPT", "1"); |
| 132 | } |
| 133 | new_name = create_tmp_pem(path, prompt); |
| 134 | if (!getenv("X11VNC_SSL_NO_PASSPHRASE") && !inetd && !opts_bg) { |
| 135 | sslEncKey(new_name, 0); |
| 136 | } |
| 137 | } |
| 138 | return new_name; |
| 139 | } |
| 140 | |
| 141 | if (! quiet) { |
| 142 | char line[1024]; |
| 143 | int on = 0; |
| 144 | FILE *in = fopen(path, "r"); |
| 145 | if (in != NULL) { |
| 146 | rfbLog("\n"); |
| 147 | rfbLog("Using SSL Certificate:\n"); |
| 148 | fprintf(stderr, "\n"); |
| 149 | while (fgets(line, 1024, in) != NULL) { |
| 150 | if (strstr(line, "BEGIN CERTIFICATE")) { |
| 151 | on = 1; |
| 152 | } |
| 153 | if (on) { |
| 154 | fprintf(stderr, "%s", line); |
| 155 | } |
| 156 | if (strstr(line, "END CERTIFICATE")) { |
| 157 | on = 0; |
| 158 | } |
| 159 | if (strstr(line, "PRIVATE KEY")) { |
| 160 | on = 0; |
| 161 | } |
| 162 | } |
| 163 | fprintf(stderr, "\n"); |
| 164 | fclose(in); |
| 165 | } |
| 166 | } |
| 167 | return strdup(path); |
| 168 | } |
| 169 | |
| 170 | static char *get_input(char *tag, char **in) { |
| 171 | char line[1024], *str; |
| 172 | |
| 173 | if (! tag || ! in || ! *in) { |
| 174 | return NULL; |
| 175 | } |
| 176 | |
| 177 | fprintf(stderr, "%s:\n [%s] ", tag, *in); |
| 178 | if (fgets(line, 1024, stdin) == NULL) { |
| 179 | rfbLog("could not read stdin!\n"); |
| 180 | rfbLogPerror("fgets"); |
| 181 | clean_up_exit(1); |
| 182 | } |
| 183 | if ((str = strrchr(line, '\n')) != NULL) { |
| 184 | *str = '\0'; |
| 185 | } |
| 186 | str = lblanks(line); |
| 187 | if (!strcmp(str, "")) { |
| 188 | return *in; |
| 189 | } else { |
| 190 | return strdup(line); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | char *find_openssl_bin(void) { |
| 195 | char *path, *exe, *p, *gp; |
| 196 | struct stat sbuf; |
| 197 | int found_openssl = 0; |
| 198 | char extra[] = ":/usr/bin:/bin:/usr/sbin:/usr/local/bin" |
| 199 | ":/usr/local/sbin:/usr/sfw/bin"; |
| 200 | |
| 201 | gp = getenv("PATH"); |
| 202 | if (! gp) { |
| 203 | fprintf(stderr, "could not find openssl(1) program in PATH. (null)\n"); |
| 204 | return NULL; |
| 205 | } |
| 206 | |
| 207 | path = (char *) malloc(strlen(gp) + strlen(extra) + 1); |
| 208 | strcpy(path, gp); |
| 209 | strcat(path, extra); |
| 210 | |
| 211 | /* find openssl binary: */ |
| 212 | exe = (char *) malloc(strlen(path) + strlen("/openssl") + 1); |
| 213 | p = strtok(path, ":"); |
| 214 | |
| 215 | while (p) { |
| 216 | sprintf(exe, "%s/openssl", p); |
| 217 | if (stat(exe, &sbuf) == 0) { |
| 218 | if (! S_ISDIR(sbuf.st_mode)) { |
| 219 | found_openssl = 1; |
| 220 | break; |
| 221 | } |
| 222 | } |
| 223 | p = strtok(NULL, ":"); |
| 224 | } |
| 225 | free(path); |
| 226 | |
| 227 | if (! found_openssl) { |
| 228 | fprintf(stderr, "could not find openssl(1) program in PATH.\n"); |
| 229 | fprintf(stderr, "PATH=%s\n", gp); |
| 230 | fprintf(stderr, "(also checked: %s)\n", extra); |
| 231 | return NULL; |
| 232 | } |
| 233 | return exe; |
| 234 | } |
| 235 | |
| 236 | /* uses /usr/bin/openssl to create a tmp cert */ |
| 237 | |
| 238 | char *create_tmp_pem(char *pathin, int prompt) { |
| 239 | pid_t pid, pidw; |
| 240 | FILE *in, *out; |
| 241 | char cnf[] = "/tmp/x11vnc-cnf.XXXXXX"; |
| 242 | char pem[] = "/tmp/x11vnc-pem.XXXXXX"; |
| 243 | char str[8*1024], line[1024], *exe; |
| 244 | int cnf_fd, pem_fd, status, show_cert = 1; |
| 245 | char *days; |
| 246 | char *C, *L, *OU, *O, *CN, *EM; |
| 247 | char tmpl[] = |
| 248 | "[ req ]\n" |
| 249 | "prompt = no\n" |
| 250 | "default_bits = 2048\n" |
| 251 | "encrypt_key = yes\n" |
| 252 | "distinguished_name = req_dn\n" |
| 253 | "x509_extensions = cert_type\n" |
| 254 | "\n" |
| 255 | "[ req_dn ]\n" |
| 256 | "countryName=%s\n" |
| 257 | "localityName=%s\n" |
| 258 | "organizationalUnitName=%s\n" |
| 259 | "organizationName=%s\n" |
| 260 | "commonName=%s\n" |
| 261 | "emailAddress=%s\n" |
| 262 | "\n" |
| 263 | "[ cert_type ]\n" |
| 264 | "nsCertType = server\n" |
| 265 | ; |
| 266 | |
| 267 | C = strdup("AU"); |
| 268 | L = strdup(UT.sysname ? UT.sysname : "unknown-os"); |
| 269 | snprintf(line, 1024, "%s-%f", UT.nodename ? UT.nodename : |
| 270 | "unknown-node", dnow()); |
| 271 | line[1024-1] = '\0'; |
| 272 | |
| 273 | OU = strdup(line); |
| 274 | O = strdup("x11vnc"); |
| 275 | if (pathin) { |
| 276 | snprintf(line, 1024, "x11vnc-SELF-SIGNED-CERT-%d", getpid()); |
| 277 | } else { |
| 278 | snprintf(line, 1024, "x11vnc-SELF-SIGNED-TEMPORARY-CERT-%d", |
| 279 | getpid()); |
| 280 | } |
| 281 | line[1024-1] = '\0'; |
| 282 | CN = strdup(line); |
| 283 | EM = strdup("x11vnc@server.nowhere"); |
| 284 | |
| 285 | /* ssl */ |
| 286 | if (no_external_cmds || !cmd_ok("ssl")) { |
| 287 | rfbLog("create_tmp_pem: cannot run external commands.\n"); |
| 288 | return NULL; |
| 289 | } |
| 290 | |
| 291 | rfbLog("\n"); |
| 292 | if (pathin) { |
| 293 | rfbLog("Creating a self-signed PEM certificate...\n"); |
| 294 | } else { |
| 295 | rfbLog("Creating a temporary, self-signed PEM certificate...\n"); |
| 296 | } |
| 297 | |
| 298 | rfbLog("\n"); |
| 299 | rfbLog("This will NOT prevent Man-In-The-Middle attacks UNLESS you\n"); |
| 300 | rfbLog("get the certificate information to the VNC viewers SSL\n"); |
| 301 | rfbLog("tunnel configuration or you take the extra steps to sign it\n"); |
| 302 | rfbLog("with a CA key. However, it will prevent passive network\n"); |
| 303 | rfbLog("sniffing.\n"); |
| 304 | rfbLog("\n"); |
| 305 | rfbLog("The cert inside -----BEGIN CERTIFICATE-----\n"); |
| 306 | rfbLog(" ....\n"); |
| 307 | rfbLog(" -----END CERTIFICATE-----\n"); |
| 308 | rfbLog("printed below may be used on the VNC viewer-side to\n"); |
| 309 | rfbLog("authenticate this server for this session. See the -ssl\n"); |
| 310 | rfbLog("help output and the FAQ for how to create a permanent\n"); |
| 311 | rfbLog("server certificate.\n"); |
| 312 | rfbLog("\n"); |
| 313 | |
| 314 | exe = find_openssl_bin(); |
| 315 | if (! exe) { |
| 316 | return NULL; |
| 317 | } |
| 318 | |
| 319 | /* create template file with our made up stuff: */ |
| 320 | if (prompt) { |
| 321 | fprintf(stderr, "\nReply to the following prompts to set" |
| 322 | " your Certificate parameters.\n"); |
| 323 | fprintf(stderr, "(press Enter to accept the default in [...], " |
| 324 | "or type in the value you want)\n\n"); |
| 325 | C = get_input("CountryName", &C); |
| 326 | L = get_input("LocalityName", &L); |
| 327 | OU = get_input("OrganizationalUnitName", &OU); |
| 328 | O = get_input("OrganizationalName", &O); |
| 329 | CN = get_input("CommonName", &CN); |
| 330 | EM = get_input("EmailAddress", &EM); |
| 331 | } |
| 332 | sprintf(str, tmpl, C, L, OU, O, CN, EM); |
| 333 | |
| 334 | cnf_fd = mkstemp(cnf); |
| 335 | if (cnf_fd < 0) { |
| 336 | return NULL; |
| 337 | } |
| 338 | pem_fd = mkstemp(pem); |
| 339 | if (pem_fd < 0) { |
| 340 | close(cnf_fd); |
| 341 | return NULL; |
| 342 | } |
| 343 | |
| 344 | close(pem_fd); |
| 345 | |
| 346 | write(cnf_fd, str, strlen(str)); |
| 347 | close(cnf_fd); |
| 348 | |
| 349 | if (pathin) { |
| 350 | days = "365"; |
| 351 | } else { |
| 352 | days = "30"; |
| 353 | } |
| 354 | |
| 355 | #ifndef FORK_OK |
| 356 | rfbLog("not compiled with fork(2)\n"); |
| 357 | clean_up_exit(1); |
| 358 | #else |
| 359 | /* make RSA key */ |
| 360 | pid = fork(); |
| 361 | if (pid < 0) { |
| 362 | return NULL; |
| 363 | } else if (pid == 0) { |
| 364 | int i; |
| 365 | for (i=0; i<256; i++) { |
| 366 | close(i); |
| 367 | } |
| 368 | execlp(exe, exe, "req", "-new", "-x509", "-nodes", |
| 369 | "-days", days, "-config", cnf, "-out", pem, |
| 370 | "-keyout", pem, (char *)0); |
| 371 | exit(1); |
| 372 | } |
| 373 | pidw = waitpid(pid, &status, 0); |
| 374 | if (pidw != pid) { |
| 375 | return NULL; |
| 376 | } |
| 377 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { |
| 378 | ; |
| 379 | } else { |
| 380 | return NULL; |
| 381 | } |
| 382 | |
| 383 | #if DO_DH |
| 384 | /* make DH parameters */ |
| 385 | pid = fork(); |
| 386 | if (pid < 0) { |
| 387 | return NULL; |
| 388 | } else if (pid == 0) { |
| 389 | int i; |
| 390 | for (i=0; i<256; i++) { |
| 391 | close(i); |
| 392 | } |
| 393 | /* rather slow at 1024 */ |
| 394 | execlp(exe, exe, "dhparam", "-out", cnf, "512", (char *)0); |
| 395 | exit(1); |
| 396 | } |
| 397 | pidw = waitpid(pid, &status, 0); |
| 398 | if (pidw != pid) { |
| 399 | return NULL; |
| 400 | } |
| 401 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { |
| 402 | ; |
| 403 | } else { |
| 404 | return NULL; |
| 405 | } |
| 406 | |
| 407 | /* append result: */ |
| 408 | in = fopen(cnf, "r"); |
| 409 | if (in == NULL) { |
| 410 | return NULL; |
| 411 | } |
| 412 | out = fopen(pem, "a"); |
| 413 | if (out == NULL) { |
| 414 | fclose(in); |
| 415 | return NULL; |
| 416 | } |
| 417 | while (fgets(line, 1024, in) != NULL) { |
| 418 | fprintf(out, "%s", line); |
| 419 | } |
| 420 | fclose(in); |
| 421 | fclose(out); |
| 422 | #endif |
| 423 | |
| 424 | #endif /* FORK_OK */ |
| 425 | |
| 426 | unlink(cnf); |
| 427 | free(exe); |
| 428 | |
| 429 | if (pathin != NULL) { |
| 430 | char *q, *pathcrt = strdup(pathin); |
| 431 | FILE *crt = NULL; |
| 432 | int on = 0; |
| 433 | |
| 434 | q = strrchr(pathcrt, '/'); |
| 435 | if (q) { |
| 436 | q = strstr(q, ".pem"); |
| 437 | if (q) { |
| 438 | *(q+1) = 'c'; |
| 439 | *(q+2) = 'r'; |
| 440 | *(q+3) = 't'; |
| 441 | crt = fopen(pathcrt, "w"); |
| 442 | } |
| 443 | } |
| 444 | if (crt == NULL) { |
| 445 | rfbLog("could not open: %s\n", pathcrt); |
| 446 | rfbLogPerror("fopen"); |
| 447 | return NULL; |
| 448 | } |
| 449 | |
| 450 | out = fopen(pathin, "w"); |
| 451 | chmod(pathin, 0600); |
| 452 | if (out == NULL) { |
| 453 | rfbLog("could not open: %s\n", pathin); |
| 454 | rfbLogPerror("fopen"); |
| 455 | fclose(crt); |
| 456 | return NULL; |
| 457 | } |
| 458 | |
| 459 | in = fopen(pem, "r"); |
| 460 | if (in == NULL) { |
| 461 | rfbLog("could not open: %s\n", pem); |
| 462 | rfbLogPerror("fopen"); |
| 463 | fclose(out); |
| 464 | fclose(crt); |
| 465 | unlink(pathin); |
| 466 | unlink(pathcrt); |
| 467 | return NULL; |
| 468 | } |
| 469 | while (fgets(line, 1024, in) != NULL) { |
| 470 | if (strstr(line, "BEGIN CERTIFICATE")) { |
| 471 | on = 1; |
| 472 | } |
| 473 | fprintf(out, "%s", line); |
| 474 | if (on) { |
| 475 | fprintf(crt, "%s", line); |
| 476 | if (!quiet) { |
| 477 | fprintf(stderr, "%s", line); |
| 478 | } |
| 479 | } |
| 480 | if (strstr(line, "END CERTIFICATE")) { |
| 481 | on = 0; |
| 482 | } |
| 483 | if (strstr(line, "PRIVATE KEY")) { |
| 484 | on = 0; |
| 485 | } |
| 486 | } |
| 487 | fclose(in); |
| 488 | fclose(out); |
| 489 | fclose(crt); |
| 490 | } |
| 491 | |
| 492 | if (show_cert) { |
| 493 | exe = find_openssl_bin(); |
| 494 | if (!exe) { |
| 495 | exe = strdup("openssl"); |
| 496 | } |
| 497 | if (strlen(pem) + strlen(exe) < 4000) { |
| 498 | char cmd[5000]; |
| 499 | if (inetd) { |
| 500 | sprintf(cmd, "%s x509 -text -in '%s' 1>&2", exe, pem); |
| 501 | } else { |
| 502 | sprintf(cmd, "%s x509 -text -in '%s'", exe, pem); |
| 503 | } |
| 504 | fprintf(stderr, "\n"); |
| 505 | system(cmd); |
| 506 | fprintf(stderr, "\n"); |
| 507 | } |
| 508 | free(exe); |
| 509 | } |
| 510 | |
| 511 | if (pathin) { |
| 512 | unlink(pem); |
| 513 | return strdup(pathin); |
| 514 | } else { |
| 515 | return strdup(pem); |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | static int appendfile(FILE *out, char *infile) { |
| 520 | char line[1024]; |
| 521 | FILE *in; |
| 522 | |
| 523 | if (! infile) { |
| 524 | rfbLog("appendfile: null infile.\n"); |
| 525 | return 0; |
| 526 | } |
| 527 | if (! out) { |
| 528 | rfbLog("appendfile: null out handle.\n"); |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | in = fopen(infile, "r"); |
| 533 | |
| 534 | if (in == NULL) { |
| 535 | rfbLog("appendfile: %s\n", infile); |
| 536 | rfbLogPerror("fopen"); |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | while (fgets(line, 1024, in) != NULL) { |
| 541 | fprintf(out, "%s", line); |
| 542 | } |
| 543 | fclose(in); |
| 544 | return 1; |
| 545 | } |
| 546 | |
| 547 | char *get_ssl_verify_file(char *str_in) { |
| 548 | char *p, *str, *cdir, *tmp; |
| 549 | char *tfile, *tfile2; |
| 550 | FILE *file; |
| 551 | struct stat sbuf; |
| 552 | int count = 0, fd; |
| 553 | |
| 554 | if (! str_in) { |
| 555 | rfbLog("get_ssl_verify_file: no filename\n"); |
| 556 | exit(1); |
| 557 | } |
| 558 | |
| 559 | if (stat(str_in, &sbuf) == 0) { |
| 560 | /* assume he knows what he is doing. */ |
| 561 | return str_in; |
| 562 | } |
| 563 | |
| 564 | cdir = get_Cert_dir(NULL, &tmp); |
| 565 | if (! cdir || ! tmp) { |
| 566 | rfbLog("get_ssl_verify_file: invalid cert-dir.\n"); |
| 567 | exit(1); |
| 568 | } |
| 569 | |
| 570 | tfile = (char *) malloc(strlen(tmp) + 1024); |
| 571 | tfile2 = (char *) malloc(strlen(tmp) + 1024); |
| 572 | |
| 573 | sprintf(tfile, "%s/sslverify-tmp-load-%d.crts.XXXXXX", tmp, getpid()); |
| 574 | |
| 575 | fd = mkstemp(tfile); |
| 576 | if (fd < 0) { |
| 577 | rfbLog("get_ssl_verify_file: %s\n", tfile); |
| 578 | rfbLogPerror("mkstemp"); |
| 579 | exit(1); |
| 580 | } |
| 581 | close(fd); |
| 582 | |
| 583 | file = fopen(tfile, "w"); |
| 584 | chmod(tfile, 0600); |
| 585 | if (file == NULL) { |
| 586 | rfbLog("get_ssl_verify_file: %s\n", tfile); |
| 587 | rfbLogPerror("fopen"); |
| 588 | exit(1); |
| 589 | } |
| 590 | |
| 591 | str = strdup(str_in); |
| 592 | p = strtok(str, ","); |
| 593 | |
| 594 | while (p) { |
| 595 | if (!strcmp(p, "CA")) { |
| 596 | sprintf(tfile2, "%s/CA/cacert.pem", cdir); |
| 597 | if (! appendfile(file, tfile2)) { |
| 598 | unlink(tfile); |
| 599 | exit(1); |
| 600 | } |
| 601 | rfbLog("sslverify: loaded %s\n", tfile2); |
| 602 | count++; |
| 603 | |
| 604 | } else if (!strcmp(p, "clients")) { |
| 605 | DIR *dir; |
| 606 | struct dirent *dp; |
| 607 | |
| 608 | sprintf(tfile2, "%s/clients", cdir); |
| 609 | dir = opendir(tfile2); |
| 610 | if (! dir) { |
| 611 | rfbLog("get_ssl_verify_file: %s\n", tfile2); |
| 612 | rfbLogPerror("opendir"); |
| 613 | unlink(tfile); |
| 614 | exit(1); |
| 615 | } |
| 616 | while ( (dp = readdir(dir)) != NULL) { |
| 617 | char *n = dp->d_name; |
| 618 | char *q = strstr(n, ".crt"); |
| 619 | |
| 620 | if (! q || strlen(q) != strlen(".crt")) { |
| 621 | continue; |
| 622 | } |
| 623 | if (strlen(n) > 512) { |
| 624 | continue; |
| 625 | } |
| 626 | |
| 627 | sprintf(tfile2, "%s/clients/%s", cdir, n); |
| 628 | if (! appendfile(file, tfile2)) { |
| 629 | unlink(tfile); |
| 630 | exit(1); |
| 631 | } |
| 632 | rfbLog("sslverify: loaded %s\n", |
| 633 | tfile2); |
| 634 | count++; |
| 635 | } |
| 636 | closedir(dir); |
| 637 | |
| 638 | } else { |
| 639 | if (strlen(p) > 512) { |
| 640 | unlink(tfile); |
| 641 | exit(1); |
| 642 | } |
| 643 | sprintf(tfile2, "%s/clients/%s.crt", cdir, p); |
| 644 | if (stat(tfile2, &sbuf) != 0) { |
| 645 | sprintf(tfile2, "%s/clients/%s", cdir, p); |
| 646 | } |
| 647 | if (! appendfile(file, tfile2)) { |
| 648 | unlink(tfile); |
| 649 | exit(1); |
| 650 | } |
| 651 | rfbLog("sslverify: loaded %s\n", tfile2); |
| 652 | count++; |
| 653 | } |
| 654 | p = strtok(NULL, ","); |
| 655 | } |
| 656 | fclose(file); |
| 657 | free(tfile2); |
| 658 | free(str); |
| 659 | |
| 660 | rfbLog("sslverify: using %d client certs in\n", count); |
| 661 | rfbLog("sslverify: %s\n", tfile); |
| 662 | |
| 663 | return tfile; |
| 664 | } |
| 665 | |
| 666 | int openssl_present(void); |
| 667 | void openssl_init(int isclient); |
| 668 | void openssl_port(int restart); |
| 669 | void https_port(int restart); |
| 670 | void check_openssl(void); |
| 671 | void check_https(void); |
| 672 | void ssl_helper_pid(pid_t pid, int sock); |
| 673 | void accept_openssl(int mode, int presock); |
| 674 | |
| 675 | static void lose_ram(void); |
| 676 | #define ABSIZE 16384 |
| 677 | |
| 678 | static int vencrypt_selected = 0; |
| 679 | static int anontls_selected = 0; |
| 680 | |
| 681 | /* to test no openssl libssl */ |
| 682 | #if 0 |
| 683 | #undef LIBVNCSERVER_HAVE_LIBSSL |
| 684 | #define LIBVNCSERVER_HAVE_LIBSSL 0 |
| 685 | #endif |
| 686 | |
| 687 | #if !LIBVNCSERVER_HAVE_LIBSSL |
| 688 | |
| 689 | static void badnews(char *name) { |
| 690 | use_openssl = 0; |
| 691 | use_stunnel = 0; |
| 692 | rfbLog("** %s: not compiled with libssl OpenSSL support **\n", name ? name : "???"); |
| 693 | clean_up_exit(1); |
| 694 | } |
| 695 | |
| 696 | int openssl_present(void) {return 0;} |
| 697 | void openssl_init(int isclient) {badnews("openssl_init");} |
| 698 | |
| 699 | #define SSL_ERROR_NONE 0 |
| 700 | |
| 701 | static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https) { |
| 702 | if (enc_str != NULL) { |
| 703 | return 1; |
| 704 | } |
| 705 | badnews("ssl_init"); |
| 706 | return 0; |
| 707 | } |
| 708 | |
| 709 | static void ssl_xfer(int csock, int s_in, int s_out, int is_https) { |
| 710 | if (enc_str != NULL && !strcmp(enc_str, "none")) { |
| 711 | usleep(250*1000); |
| 712 | rfbLog("doing '-enc none' raw transfer (no encryption)\n"); |
| 713 | raw_xfer(csock, s_in, s_out); |
| 714 | } else { |
| 715 | badnews("ssl_xfer"); |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | #else /* LIBVNCSERVER_HAVE_LIBSSL */ |
| 720 | |
| 721 | /* |
| 722 | * This is because on older systems both zlib.h and ssl.h define |
| 723 | * 'free_func' nothing we do below (currently) induces an external |
| 724 | * dependency on 'free_func'. |
| 725 | */ |
| 726 | #define free_func my_jolly_little_free_func |
| 727 | |
| 728 | #include <openssl/ssl.h> |
| 729 | #include <openssl/err.h> |
| 730 | #include <openssl/rand.h> |
| 731 | |
| 732 | static SSL_CTX *ctx = NULL; |
| 733 | static RSA *rsa_512 = NULL; |
| 734 | static RSA *rsa_1024 = NULL; |
| 735 | static SSL *ssl = NULL; |
| 736 | static X509_STORE *revocation_store = NULL; |
| 737 | |
| 738 | |
| 739 | static void init_prng(void); |
| 740 | static void sslerrexit(void); |
| 741 | static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https); |
| 742 | static void ssl_xfer(int csock, int s_in, int s_out, int is_https); |
| 743 | |
| 744 | #ifndef FORK_OK |
| 745 | void openssl_init(int isclient) { |
| 746 | rfbLog("openssl_init: fork is not supported. cannot create" |
| 747 | " ssl helper process.\n"); |
| 748 | clean_up_exit(1); |
| 749 | } |
| 750 | int openssl_present(void) {return 0;} |
| 751 | |
| 752 | #else |
| 753 | |
| 754 | int openssl_present(void) {return 1;} |
| 755 | |
| 756 | static void sslerrexit(void) { |
| 757 | unsigned long err = ERR_get_error(); |
| 758 | |
| 759 | if (err) { |
| 760 | char str[256]; |
| 761 | ERR_error_string(err, str); |
| 762 | fprintf(stderr, "ssl error: %s\n", str); |
| 763 | } |
| 764 | clean_up_exit(1); |
| 765 | } |
| 766 | |
| 767 | static int pem_passwd_callback(char *buf, int size, int rwflag, |
| 768 | void *userdata) { |
| 769 | char *q, line[1024]; |
| 770 | |
| 771 | if (! buf) { |
| 772 | exit(1); |
| 773 | } |
| 774 | |
| 775 | fprintf(stderr, "\nA passphrase is needed to unlock an OpenSSL " |
| 776 | "private key (PEM file).\n"); |
| 777 | fprintf(stderr, "Enter passphrase> "); |
| 778 | system("stty -echo"); |
| 779 | if(fgets(line, 1024, stdin) == NULL) { |
| 780 | fprintf(stdout, "\n"); |
| 781 | system("stty echo"); |
| 782 | exit(1); |
| 783 | } |
| 784 | system("stty echo"); |
| 785 | fprintf(stdout, "\n\n"); |
| 786 | q = strrchr(line, '\n'); |
| 787 | if (q) { |
| 788 | *q = '\0'; |
| 789 | } |
| 790 | line[1024 - 1] = '\0'; |
| 791 | strncpy(buf, line, size); |
| 792 | buf[size - 1] = '\0'; |
| 793 | |
| 794 | if (0) rwflag = 0; /* compiler warning. */ |
| 795 | if (0) userdata = 0; /* compiler warning. */ |
| 796 | |
| 797 | return strlen(buf); |
| 798 | } |
| 799 | |
| 800 | /* based on mod_ssl */ |
| 801 | static int crl_callback(X509_STORE_CTX *callback_ctx) { |
| 802 | X509_STORE_CTX store_ctx; |
| 803 | X509_OBJECT obj; |
| 804 | X509_NAME *subject; |
| 805 | X509_NAME *issuer; |
| 806 | X509 *xs; |
| 807 | X509_CRL *crl; |
| 808 | X509_REVOKED *revoked; |
| 809 | EVP_PKEY *pubkey; |
| 810 | long serial; |
| 811 | BIO *bio; |
| 812 | int i, n, rc; |
| 813 | char *cp, *cp2; |
| 814 | ASN1_TIME *t; |
| 815 | |
| 816 | /* Determine certificate ingredients in advance */ |
| 817 | xs = X509_STORE_CTX_get_current_cert(callback_ctx); |
| 818 | subject = X509_get_subject_name(xs); |
| 819 | issuer = X509_get_issuer_name(xs); |
| 820 | |
| 821 | /* Try to retrieve a CRL corresponding to the _subject_ of |
| 822 | * the current certificate in order to verify it's integrity. */ |
| 823 | memset((char *)&obj, 0, sizeof(obj)); |
| 824 | X509_STORE_CTX_init(&store_ctx, revocation_store, NULL, NULL); |
| 825 | rc=X509_STORE_get_by_subject(&store_ctx, X509_LU_CRL, subject, &obj); |
| 826 | X509_STORE_CTX_cleanup(&store_ctx); |
| 827 | crl=obj.data.crl; |
| 828 | |
| 829 | if(rc>0 && crl) { |
| 830 | /* Log information about CRL |
| 831 | * (A little bit complicated because of ASN.1 and BIOs...) */ |
| 832 | bio=BIO_new(BIO_s_mem()); |
| 833 | BIO_printf(bio, "lastUpdate: "); |
| 834 | ASN1_UTCTIME_print(bio, X509_CRL_get_lastUpdate(crl)); |
| 835 | BIO_printf(bio, ", nextUpdate: "); |
| 836 | ASN1_UTCTIME_print(bio, X509_CRL_get_nextUpdate(crl)); |
| 837 | n=BIO_pending(bio); |
| 838 | cp=malloc(n+1); |
| 839 | n=BIO_read(bio, cp, n); |
| 840 | cp[n]='\0'; |
| 841 | BIO_free(bio); |
| 842 | cp2=X509_NAME_oneline(subject, NULL, 0); |
| 843 | rfbLog("CA CRL: Issuer: %s, %s\n", cp2, cp); |
| 844 | OPENSSL_free(cp2); |
| 845 | free(cp); |
| 846 | |
| 847 | /* Verify the signature on this CRL */ |
| 848 | pubkey=X509_get_pubkey(xs); |
| 849 | if(X509_CRL_verify(crl, pubkey)<=0) { |
| 850 | rfbLog("Invalid signature on CRL\n"); |
| 851 | X509_STORE_CTX_set_error(callback_ctx, |
| 852 | X509_V_ERR_CRL_SIGNATURE_FAILURE); |
| 853 | X509_OBJECT_free_contents(&obj); |
| 854 | if(pubkey) |
| 855 | EVP_PKEY_free(pubkey); |
| 856 | return 0; /* Reject connection */ |
| 857 | } |
| 858 | if(pubkey) |
| 859 | EVP_PKEY_free(pubkey); |
| 860 | |
| 861 | /* Check date of CRL to make sure it's not expired */ |
| 862 | t=X509_CRL_get_nextUpdate(crl); |
| 863 | if(!t) { |
| 864 | rfbLog("Found CRL has invalid nextUpdate field\n"); |
| 865 | X509_STORE_CTX_set_error(callback_ctx, |
| 866 | X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD); |
| 867 | X509_OBJECT_free_contents(&obj); |
| 868 | return 0; /* Reject connection */ |
| 869 | } |
| 870 | if(X509_cmp_current_time(t)<0) { |
| 871 | rfbLog("Found CRL is expired - " |
| 872 | "revoking all certificates until you get updated CRL\n"); |
| 873 | X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CRL_HAS_EXPIRED); |
| 874 | X509_OBJECT_free_contents(&obj); |
| 875 | return 0; /* Reject connection */ |
| 876 | } |
| 877 | X509_OBJECT_free_contents(&obj); |
| 878 | } |
| 879 | |
| 880 | /* Try to retrieve a CRL corresponding to the _issuer_ of |
| 881 | * the current certificate in order to check for revocation. */ |
| 882 | memset((char *)&obj, 0, sizeof(obj)); |
| 883 | X509_STORE_CTX_init(&store_ctx, revocation_store, NULL, NULL); |
| 884 | rc=X509_STORE_get_by_subject(&store_ctx, X509_LU_CRL, issuer, &obj); |
| 885 | X509_STORE_CTX_cleanup(&store_ctx); |
| 886 | crl=obj.data.crl; |
| 887 | |
| 888 | if(rc>0 && crl) { |
| 889 | /* Check if the current certificate is revoked by this CRL */ |
| 890 | n=sk_X509_REVOKED_num(X509_CRL_get_REVOKED(crl)); |
| 891 | for(i=0; i<n; i++) { |
| 892 | revoked=sk_X509_REVOKED_value(X509_CRL_get_REVOKED(crl), i); |
| 893 | if(ASN1_INTEGER_cmp(revoked->serialNumber, |
| 894 | X509_get_serialNumber(xs)) == 0) { |
| 895 | serial=ASN1_INTEGER_get(revoked->serialNumber); |
| 896 | cp=X509_NAME_oneline(issuer, NULL, 0); |
| 897 | rfbLog("Certificate with serial %ld (0x%lX) " |
| 898 | "revoked per CRL from issuer %s\n", serial, serial, cp); |
| 899 | OPENSSL_free(cp); |
| 900 | X509_STORE_CTX_set_error(callback_ctx, X509_V_ERR_CERT_REVOKED); |
| 901 | X509_OBJECT_free_contents(&obj); |
| 902 | return 0; /* Reject connection */ |
| 903 | } |
| 904 | } |
| 905 | X509_OBJECT_free_contents(&obj); |
| 906 | } |
| 907 | |
| 908 | return 1; /* Accept connection */ |
| 909 | } |
| 910 | |
| 911 | static int verify_callback(int ok, X509_STORE_CTX *callback_ctx) { |
| 912 | if (!ssl_verify) { |
| 913 | rfbLog("CRL_check: skipped.\n"); |
| 914 | return ok; |
| 915 | } |
| 916 | if (!ssl_crl) { |
| 917 | rfbLog("CRL_check: skipped.\n"); |
| 918 | return ok; |
| 919 | } |
| 920 | if (!ok) { |
| 921 | rfbLog("CRL_check: client cert is already rejected.\n"); |
| 922 | return ok; |
| 923 | } |
| 924 | if (revocation_store) { |
| 925 | if (crl_callback(callback_ctx)) { |
| 926 | rfbLog("CRL_check: succeeded.\n"); |
| 927 | return 1; |
| 928 | } else { |
| 929 | rfbLog("CRL_check: did not pass.\n"); |
| 930 | return 0; |
| 931 | } |
| 932 | } |
| 933 | /* NOTREACHED */ |
| 934 | return 1; |
| 935 | } |
| 936 | |
| 937 | #define rfbSecTypeAnonTls 18 |
| 938 | #define rfbSecTypeVencrypt 19 |
| 939 | |
| 940 | #define rfbVencryptPlain 256 |
| 941 | #define rfbVencryptTlsNone 257 |
| 942 | #define rfbVencryptTlsVnc 258 |
| 943 | #define rfbVencryptTlsPlain 259 |
| 944 | #define rfbVencryptX509None 260 |
| 945 | #define rfbVencryptX509Vnc 261 |
| 946 | #define rfbVencryptX509Plain 262 |
| 947 | |
| 948 | static int ssl_client_mode = 0; |
| 949 | |
| 950 | static int switch_to_anon_dh(void); |
| 951 | |
| 952 | void openssl_init(int isclient) { |
| 953 | int db = 0, tmp_pem = 0, do_dh; |
| 954 | FILE *in; |
| 955 | double ds; |
| 956 | long mode; |
| 957 | static int first = 1; |
| 958 | |
| 959 | do_dh = DO_DH; |
| 960 | |
| 961 | if (enc_str != NULL) { |
| 962 | if (first) { |
| 963 | init_prng(); |
| 964 | } |
| 965 | first = 0; |
| 966 | return; |
| 967 | } |
| 968 | |
| 969 | if (! quiet) { |
| 970 | rfbLog("\n"); |
| 971 | rfbLog("Initializing SSL (%s connect mode).\n", isclient ? "client":"server"); |
| 972 | } |
| 973 | if (first) { |
| 974 | if (db) fprintf(stderr, "\nSSL_load_error_strings()\n"); |
| 975 | |
| 976 | SSL_load_error_strings(); |
| 977 | |
| 978 | if (db) fprintf(stderr, "SSL_library_init()\n"); |
| 979 | |
| 980 | SSL_library_init(); |
| 981 | |
| 982 | if (db) fprintf(stderr, "init_prng()\n"); |
| 983 | |
| 984 | init_prng(); |
| 985 | |
| 986 | first = 0; |
| 987 | } |
| 988 | |
| 989 | if (isclient) { |
| 990 | ssl_client_mode = 1; |
| 991 | } else { |
| 992 | ssl_client_mode = 0; |
| 993 | } |
| 994 | |
| 995 | if (ssl_client_mode) { |
| 996 | if (db) fprintf(stderr, "SSLv23_client_method()\n"); |
| 997 | ctx = SSL_CTX_new( SSLv23_client_method() ); |
| 998 | } else { |
| 999 | if (db) fprintf(stderr, "SSLv23_server_method()\n"); |
| 1000 | ctx = SSL_CTX_new( SSLv23_server_method() ); |
| 1001 | } |
| 1002 | |
| 1003 | if (ctx == NULL) { |
| 1004 | rfbLog("openssl_init: SSL_CTX_new failed.\n"); |
| 1005 | sslerrexit(); |
| 1006 | } |
| 1007 | |
| 1008 | ds = dnow(); |
| 1009 | rsa_512 = RSA_generate_key(512, RSA_F4, NULL, NULL); |
| 1010 | if (rsa_512 == NULL) { |
| 1011 | rfbLog("openssl_init: RSA_generate_key(512) failed.\n"); |
| 1012 | sslerrexit(); |
| 1013 | } |
| 1014 | |
| 1015 | rfbLog("created 512 bit temporary RSA key: %.3fs\n", dnow() - ds); |
| 1016 | |
| 1017 | ds = dnow(); |
| 1018 | rsa_1024 = RSA_generate_key(1024, RSA_F4, NULL, NULL); |
| 1019 | if (rsa_1024 == NULL) { |
| 1020 | rfbLog("openssl_init: RSA_generate_key(1024) failed.\n"); |
| 1021 | sslerrexit(); |
| 1022 | } |
| 1023 | |
| 1024 | rfbLog("created 1024 bit temporary RSA key: %.3fs\n", dnow() - ds); |
| 1025 | |
| 1026 | if (db) fprintf(stderr, "SSL_CTX_set_tmp_rsa()\n"); |
| 1027 | |
| 1028 | if (! SSL_CTX_set_tmp_rsa(ctx, rsa_1024)) { |
| 1029 | rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n"); |
| 1030 | sslerrexit(); |
| 1031 | } |
| 1032 | |
| 1033 | mode = 0; |
| 1034 | mode |= SSL_MODE_ENABLE_PARTIAL_WRITE; |
| 1035 | mode |= SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER; |
| 1036 | SSL_CTX_set_mode(ctx, mode); |
| 1037 | |
| 1038 | #define ssl_cache 0 |
| 1039 | #if ssl_cache |
| 1040 | SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH); |
| 1041 | SSL_CTX_set_timeout(ctx, 300); |
| 1042 | #else |
| 1043 | SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF); |
| 1044 | SSL_CTX_set_timeout(ctx, 1); |
| 1045 | #endif |
| 1046 | |
| 1047 | ds = dnow(); |
| 1048 | if (! openssl_pem) { |
| 1049 | openssl_pem = create_tmp_pem(NULL, 0); |
| 1050 | if (! openssl_pem) { |
| 1051 | rfbLog("openssl_init: could not create temporary," |
| 1052 | " self-signed PEM.\n"); |
| 1053 | clean_up_exit(1); |
| 1054 | } |
| 1055 | tmp_pem = 1; |
| 1056 | |
| 1057 | } else if (!strcmp(openssl_pem, "ANON")) { |
| 1058 | if (ssl_verify) { |
| 1059 | rfbLog("openssl_init: Anonymous Diffie-Hellman cannot" |
| 1060 | " be used in -sslverify mode.\n"); |
| 1061 | clean_up_exit(1); |
| 1062 | } |
| 1063 | if (ssl_crl) { |
| 1064 | rfbLog("openssl_init: Anonymous Diffie-Hellman cannot" |
| 1065 | " be used in -sslCRL mode.\n"); |
| 1066 | clean_up_exit(1); |
| 1067 | } |
| 1068 | /* n.b. new ctx */ |
| 1069 | if (!switch_to_anon_dh()) { |
| 1070 | rfbLog("openssl_init: Anonymous Diffie-Hellman setup" |
| 1071 | " failed.\n"); |
| 1072 | clean_up_exit(1); |
| 1073 | } |
| 1074 | } else if (strstr(openssl_pem, "SAVE") == openssl_pem) { |
| 1075 | openssl_pem = get_saved_pem(openssl_pem, 1); |
| 1076 | if (! openssl_pem) { |
| 1077 | rfbLog("openssl_init: could not create or open" |
| 1078 | " saved PEM: %s\n", openssl_pem); |
| 1079 | clean_up_exit(1); |
| 1080 | } |
| 1081 | tmp_pem = 0; |
| 1082 | } |
| 1083 | |
| 1084 | rfbLog("using PEM %s %.3fs\n", openssl_pem, dnow() - ds); |
| 1085 | |
| 1086 | SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_callback); |
| 1087 | |
| 1088 | if (do_dh) { |
| 1089 | DH *dh; |
| 1090 | BIO *bio; |
| 1091 | |
| 1092 | ds = dnow(); |
| 1093 | in = fopen(openssl_pem, "r"); |
| 1094 | if (in == NULL) { |
| 1095 | rfbLogPerror("fopen"); |
| 1096 | clean_up_exit(1); |
| 1097 | } |
| 1098 | bio = BIO_new_fp(in, BIO_CLOSE|BIO_FP_TEXT); |
| 1099 | if (! bio) { |
| 1100 | rfbLog("openssl_init: BIO_new_fp() failed.\n"); |
| 1101 | sslerrexit(); |
| 1102 | } |
| 1103 | dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); |
| 1104 | if (dh == NULL) { |
| 1105 | rfbLog("openssl_init: PEM_read_bio_DHparams() failed.\n"); |
| 1106 | BIO_free(bio); |
| 1107 | sslerrexit(); |
| 1108 | } |
| 1109 | BIO_free(bio); |
| 1110 | SSL_CTX_set_tmp_dh(ctx, dh); |
| 1111 | rfbLog("loaded Diffie Hellman %d bits, %.3fs\n", |
| 1112 | 8*DH_size(dh), dnow()-ds); |
| 1113 | DH_free(dh); |
| 1114 | } |
| 1115 | |
| 1116 | if (strcmp(openssl_pem, "ANON")) { |
| 1117 | if (! SSL_CTX_use_certificate_chain_file(ctx, openssl_pem)) { |
| 1118 | rfbLog("openssl_init: SSL_CTX_use_certificate_chain_file() failed.\n"); |
| 1119 | sslerrexit(); |
| 1120 | } |
| 1121 | if (! SSL_CTX_use_RSAPrivateKey_file(ctx, openssl_pem, |
| 1122 | SSL_FILETYPE_PEM)) { |
| 1123 | rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n"); |
| 1124 | sslerrexit(); |
| 1125 | } |
| 1126 | if (! SSL_CTX_check_private_key(ctx)) { |
| 1127 | rfbLog("openssl_init: SSL_CTX_set_tmp_rsa(1024) failed.\n"); |
| 1128 | sslerrexit(); |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | if (tmp_pem && ! getenv("X11VNC_KEEP_TMP_PEM")) { |
| 1133 | if (getenv("X11VNC_SHOW_TMP_PEM")) { |
| 1134 | FILE *in = fopen(openssl_pem, "r"); |
| 1135 | if (in != NULL) { |
| 1136 | char line[128]; |
| 1137 | fprintf(stderr, "\n"); |
| 1138 | while (fgets(line, 128, in) != NULL) { |
| 1139 | fprintf(stderr, "%s", line); |
| 1140 | } |
| 1141 | fprintf(stderr, "\n"); |
| 1142 | fclose(in); |
| 1143 | } |
| 1144 | } |
| 1145 | unlink(openssl_pem); |
| 1146 | free(openssl_pem); |
| 1147 | openssl_pem = NULL; |
| 1148 | } |
| 1149 | |
| 1150 | if (ssl_crl) { |
| 1151 | struct stat sbuf; |
| 1152 | X509_LOOKUP *lookup; |
| 1153 | |
| 1154 | if (stat(ssl_crl, &sbuf) != 0) { |
| 1155 | rfbLog("openssl_init: -sslCRL does not exist %s.\n", |
| 1156 | ssl_crl ? ssl_crl : "null"); |
| 1157 | rfbLogPerror("stat"); |
| 1158 | clean_up_exit(1); |
| 1159 | } |
| 1160 | |
| 1161 | revocation_store = X509_STORE_new(); |
| 1162 | if (!revocation_store) { |
| 1163 | rfbLog("openssl_init: X509_STORE_new failed.\n"); |
| 1164 | sslerrexit(); |
| 1165 | } |
| 1166 | if (! S_ISDIR(sbuf.st_mode)) { |
| 1167 | lookup = X509_STORE_add_lookup(revocation_store, X509_LOOKUP_file()); |
| 1168 | if (!lookup) { |
| 1169 | rfbLog("openssl_init: X509_STORE_add_lookup failed.\n"); |
| 1170 | sslerrexit(); |
| 1171 | } |
| 1172 | if (!X509_LOOKUP_load_file(lookup, ssl_crl, X509_FILETYPE_PEM)) { |
| 1173 | rfbLog("openssl_init: X509_LOOKUP_load_file failed.\n"); |
| 1174 | sslerrexit(); |
| 1175 | } |
| 1176 | } else { |
| 1177 | lookup = X509_STORE_add_lookup(revocation_store, X509_LOOKUP_hash_dir()); |
| 1178 | if (!lookup) { |
| 1179 | rfbLog("openssl_init: X509_STORE_add_lookup failed.\n"); |
| 1180 | sslerrexit(); |
| 1181 | } |
| 1182 | if (!X509_LOOKUP_add_dir(lookup, ssl_crl, X509_FILETYPE_PEM)) { |
| 1183 | rfbLog("openssl_init: X509_LOOKUP_add_dir failed.\n"); |
| 1184 | sslerrexit(); |
| 1185 | } |
| 1186 | } |
| 1187 | rfbLog("loaded CRL file: %s\n", ssl_crl); |
| 1188 | } |
| 1189 | |
| 1190 | if (ssl_verify) { |
| 1191 | struct stat sbuf; |
| 1192 | char *file; |
| 1193 | int lvl; |
| 1194 | |
| 1195 | file = get_ssl_verify_file(ssl_verify); |
| 1196 | |
| 1197 | if (!file || stat(file, &sbuf) != 0) { |
| 1198 | rfbLog("openssl_init: -sslverify does not exist %s.\n", |
| 1199 | file ? file : "null"); |
| 1200 | rfbLogPerror("stat"); |
| 1201 | clean_up_exit(1); |
| 1202 | } |
| 1203 | if (! S_ISDIR(sbuf.st_mode)) { |
| 1204 | if (! SSL_CTX_load_verify_locations(ctx, file, NULL)) { |
| 1205 | rfbLog("openssl_init: SSL_CTX_load_verify_" |
| 1206 | "locations() failed.\n"); |
| 1207 | sslerrexit(); |
| 1208 | } |
| 1209 | } else { |
| 1210 | if (! SSL_CTX_load_verify_locations(ctx, NULL, file)) { |
| 1211 | rfbLog("openssl_init: SSL_CTX_load_verify_" |
| 1212 | "locations() failed.\n"); |
| 1213 | sslerrexit(); |
| 1214 | } |
| 1215 | } |
| 1216 | |
| 1217 | lvl = SSL_VERIFY_FAIL_IF_NO_PEER_CERT|SSL_VERIFY_PEER; |
| 1218 | if (ssl_crl == NULL) { |
| 1219 | SSL_CTX_set_verify(ctx, lvl, NULL); |
| 1220 | } else { |
| 1221 | SSL_CTX_set_verify(ctx, lvl, verify_callback); |
| 1222 | } |
| 1223 | if (strstr(file, "/sslverify-tmp-load-")) { |
| 1224 | /* temporary file */ |
| 1225 | unlink(file); |
| 1226 | } |
| 1227 | } else { |
| 1228 | SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL); |
| 1229 | } |
| 1230 | |
| 1231 | rfbLog("\n"); |
| 1232 | } |
| 1233 | |
| 1234 | static int read_exact(int sock, char *buf, int len) { |
| 1235 | int n, fail = 0; |
| 1236 | if (sock < 0) { |
| 1237 | return 0; |
| 1238 | } |
| 1239 | while (len > 0) { |
| 1240 | n = read(sock, buf, len); |
| 1241 | if (n > 0) { |
| 1242 | buf += n; |
| 1243 | len -= n; |
| 1244 | } else if (n == 0) { |
| 1245 | fail = 1; |
| 1246 | break; |
| 1247 | } else if (n < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) { |
| 1248 | usleep(10*1000); |
| 1249 | } else if (n < 0 && errno != EINTR) { |
| 1250 | fail = 1; |
| 1251 | break; |
| 1252 | } |
| 1253 | } |
| 1254 | if (fail) { |
| 1255 | return 0; |
| 1256 | } else { |
| 1257 | return 1; |
| 1258 | } |
| 1259 | } |
| 1260 | |
| 1261 | static int write_exact(int sock, char *buf, int len) { |
| 1262 | int n, fail = 0; |
| 1263 | if (sock < 0) { |
| 1264 | return 0; |
| 1265 | } |
| 1266 | while (len > 0) { |
| 1267 | n = write(sock, buf, len); |
| 1268 | if (n > 0) { |
| 1269 | buf += n; |
| 1270 | len -= n; |
| 1271 | } else if (n == 0) { |
| 1272 | fail = 1; |
| 1273 | break; |
| 1274 | } else if (n < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) { |
| 1275 | usleep(10*1000); |
| 1276 | } else if (n < 0 && errno != EINTR) { |
| 1277 | fail = 1; |
| 1278 | break; |
| 1279 | } |
| 1280 | } |
| 1281 | if (fail) { |
| 1282 | return 0; |
| 1283 | } else { |
| 1284 | return 1; |
| 1285 | } |
| 1286 | } |
| 1287 | |
| 1288 | /* XXX not in rfb.h: */ |
| 1289 | void rfbClientSendString(rfbClientPtr cl, char *reason); |
| 1290 | |
| 1291 | static int finish_auth(rfbClientPtr client, char *type) { |
| 1292 | int security_result, ret; |
| 1293 | |
| 1294 | ret = 0; |
| 1295 | |
| 1296 | if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "finish_auth type=%s\n", type); |
| 1297 | |
| 1298 | if (!strcmp(type, "None")) { |
| 1299 | security_result = 0; /* success */ |
| 1300 | if (write_exact(client->sock, (char *) &security_result, 4)) { |
| 1301 | ret = 1; |
| 1302 | } |
| 1303 | rfbLog("finish_auth: using auth 'None'\n"); |
| 1304 | client->state = RFB_INITIALISATION; |
| 1305 | |
| 1306 | } else if (!strcmp(type, "Vnc")) { |
| 1307 | RAND_bytes(client->authChallenge, CHALLENGESIZE); |
| 1308 | if (write_exact(client->sock, (char *) &client->authChallenge, CHALLENGESIZE)) { |
| 1309 | ret = 1; |
| 1310 | } |
| 1311 | rfbLog("finish_auth: using auth 'Vnc', sent challenge.\n"); |
| 1312 | client->state = RFB_AUTHENTICATION; |
| 1313 | |
| 1314 | } else if (!strcmp(type, "Plain")) { |
| 1315 | if (!unixpw) { |
| 1316 | rfbLog("finish_auth: *Plain not allowed outside unixpw mode.\n"); |
| 1317 | ret = 0; |
| 1318 | } else { |
| 1319 | char *un, *pw; |
| 1320 | int unlen, pwlen; |
| 1321 | |
| 1322 | if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "*Plain begin: onHold=%d client=%p unixpw_client=%p\n", client->onHold, (void *) client, (void *) unixpw_client); |
| 1323 | |
| 1324 | if (!read_exact(client->sock, (char *)&unlen, 4)) goto fail; |
| 1325 | unlen = Swap32IfLE(unlen); |
| 1326 | |
| 1327 | if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "unlen: %d\n", unlen); |
| 1328 | |
| 1329 | if (!read_exact(client->sock, (char *)&pwlen, 4)) goto fail; |
| 1330 | pwlen = Swap32IfLE(pwlen); |
| 1331 | |
| 1332 | if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "pwlen: %d\n", pwlen); |
| 1333 | |
| 1334 | un = (char *) malloc(unlen+1); |
| 1335 | memset(un, 0, unlen+1); |
| 1336 | |
| 1337 | pw = (char *) malloc(pwlen+2); |
| 1338 | memset(pw, 0, pwlen+2); |
| 1339 | |
| 1340 | if (!read_exact(client->sock, un, unlen)) goto fail; |
| 1341 | if (!read_exact(client->sock, pw, pwlen)) goto fail; |
| 1342 | |
| 1343 | if (getenv("X11VNC_DEBUG_TLSPLAIN")) fprintf(stderr, "*Plain: %d %d '%s' ... \n", unlen, pwlen, un); |
| 1344 | strcat(pw, "\n"); |
| 1345 | |
| 1346 | if (unixpw_verify(un, pw)) { |
| 1347 | security_result = 0; /* success */ |
| 1348 | if (write_exact(client->sock, (char *) &security_result, 4)) { |
| 1349 | ret = 1; |
| 1350 | unixpw_verify_screen(un, pw); |
| 1351 | } |
| 1352 | client->onHold = FALSE; |
| 1353 | client->state = RFB_INITIALISATION; |
| 1354 | } |
| 1355 | if (ret == 0) { |
| 1356 | rfbClientSendString(client, "unixpw failed"); |
| 1357 | } |
| 1358 | |
| 1359 | memset(un, 0, unlen+1); |
| 1360 | memset(pw, 0, pwlen+2); |
| 1361 | free(un); |
| 1362 | free(pw); |
| 1363 | } |
| 1364 | } else { |
| 1365 | rfbLog("finish_auth: unknown sub-type: %s\n", type); |
| 1366 | ret = 0; |
| 1367 | } |
| 1368 | |
| 1369 | fail: |
| 1370 | return ret; |
| 1371 | } |
| 1372 | |
| 1373 | static int finish_vencrypt_auth(rfbClientPtr client, int subtype) { |
| 1374 | |
| 1375 | if (subtype == rfbVencryptTlsNone || subtype == rfbVencryptX509None) { |
| 1376 | return finish_auth(client, "None"); |
| 1377 | } else if (subtype == rfbVencryptTlsVnc || subtype == rfbVencryptX509Vnc) { |
| 1378 | return finish_auth(client, "Vnc"); |
| 1379 | } else if (subtype == rfbVencryptTlsPlain || subtype == rfbVencryptX509Plain) { |
| 1380 | return finish_auth(client, "Plain"); |
| 1381 | } else { |
| 1382 | rfbLog("finish_vencrypt_auth: unknown sub-type: %d\n", subtype); |
| 1383 | return 0; |
| 1384 | } |
| 1385 | } |
| 1386 | |
| 1387 | |
| 1388 | static int add_anon_dh(void) { |
| 1389 | pid_t pid, pidw; |
| 1390 | char cnf[] = "/tmp/x11vnc-dh.XXXXXX"; |
| 1391 | char *infile = NULL; |
| 1392 | int status, cnf_fd; |
| 1393 | DH *dh; |
| 1394 | BIO *bio; |
| 1395 | FILE *in; |
| 1396 | double ds; |
| 1397 | /* |
| 1398 | * These are dh parameters (prime, generator), not dh keys. |
| 1399 | * Evidently it is ok for them to be publicly known. |
| 1400 | * openssl dhparam -out dh.out 1024 |
| 1401 | */ |
| 1402 | char *fixed_dh_params = |
| 1403 | "-----BEGIN DH PARAMETERS-----\n" |
| 1404 | "MIGHAoGBAL28w69ZnLYBvp8R2OeqtAIms+oatY19iBL4WhGI/7H1OMmkJjIe+OHs\n" |
| 1405 | "PXoJfe5ucrnvno7Xm+HJZYa1jnPGQuWoa/VJKXdVjYdJVNzazJKM2daKKcQA4GDc\n" |
| 1406 | "msFS5DxLbzUR5jy1n12K3EcbvpyFqDYVTJJXm7NuNuiWRfz3wTozAgEC\n" |
| 1407 | "-----END DH PARAMETERS-----\n"; |
| 1408 | |
| 1409 | if (dhparams_file != NULL) { |
| 1410 | infile = dhparams_file; |
| 1411 | rfbLog("add_anon_dh: using %s\n", dhparams_file); |
| 1412 | goto readin; |
| 1413 | } |
| 1414 | |
| 1415 | cnf_fd = mkstemp(cnf); |
| 1416 | if (cnf_fd < 0) { |
| 1417 | return 0; |
| 1418 | } |
| 1419 | infile = cnf; |
| 1420 | |
| 1421 | if (create_fresh_dhparams) { |
| 1422 | |
| 1423 | if (new_dh_params != NULL) { |
| 1424 | write(cnf_fd, new_dh_params, strlen(new_dh_params)); |
| 1425 | close(cnf_fd); |
| 1426 | } else { |
| 1427 | char *exe = find_openssl_bin(); |
| 1428 | struct stat sbuf; |
| 1429 | |
| 1430 | if (no_external_cmds || !cmd_ok("ssl")) { |
| 1431 | rfbLog("add_anon_dh: cannot run external commands.\n"); |
| 1432 | return 0; |
| 1433 | } |
| 1434 | |
| 1435 | close(cnf_fd); |
| 1436 | if (exe == NULL) { |
| 1437 | return 0; |
| 1438 | } |
| 1439 | ds = dnow(); |
| 1440 | pid = fork(); |
| 1441 | if (pid < 0) { |
| 1442 | return 0; |
| 1443 | } else if (pid == 0) { |
| 1444 | int i; |
| 1445 | for (i=0; i<256; i++) { |
| 1446 | if (i == 2) continue; |
| 1447 | close(i); |
| 1448 | } |
| 1449 | /* rather slow at 1024 */ |
| 1450 | execlp(exe, exe, "dhparam", "-out", cnf, "1024", (char *)0); |
| 1451 | exit(1); |
| 1452 | } |
| 1453 | pidw = waitpid(pid, &status, 0); |
| 1454 | if (pidw != pid) { |
| 1455 | return 0; |
| 1456 | } |
| 1457 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { |
| 1458 | ; |
| 1459 | } else { |
| 1460 | return 0; |
| 1461 | } |
| 1462 | rfbLog("add_anon_dh: created new DH params in %.3f secs\n", dnow() - ds); |
| 1463 | |
| 1464 | if (stat(cnf, &sbuf) == 0 && sbuf.st_size > 0) { |
| 1465 | /* save it to reuse during our process's lifetime: */ |
| 1466 | int d = open(cnf, O_RDONLY); |
| 1467 | if (d >= 0) { |
| 1468 | int n, len = sbuf.st_size; |
| 1469 | new_dh_params = (char *) calloc(len+1, 1); |
| 1470 | n = read(d, new_dh_params, len); |
| 1471 | close(d); |
| 1472 | if (n != len) { |
| 1473 | free(new_dh_params); |
| 1474 | new_dh_params = NULL; |
| 1475 | } else if (dhret != NULL) { |
| 1476 | d = open(dhret, O_WRONLY); |
| 1477 | if (d >= 0) { |
| 1478 | write(d, new_dh_params, strlen(new_dh_params)); |
| 1479 | close(d); |
| 1480 | } |
| 1481 | } |
| 1482 | } |
| 1483 | } |
| 1484 | } |
| 1485 | } else { |
| 1486 | write(cnf_fd, fixed_dh_params, strlen(fixed_dh_params)); |
| 1487 | close(cnf_fd); |
| 1488 | } |
| 1489 | |
| 1490 | readin: |
| 1491 | |
| 1492 | ds = dnow(); |
| 1493 | in = fopen(infile, "r"); |
| 1494 | |
| 1495 | if (in == NULL) { |
| 1496 | rfbLogPerror("fopen"); |
| 1497 | unlink(cnf); |
| 1498 | return 0; |
| 1499 | } |
| 1500 | bio = BIO_new_fp(in, BIO_CLOSE|BIO_FP_TEXT); |
| 1501 | if (! bio) { |
| 1502 | rfbLog("openssl_init: BIO_new_fp() failed.\n"); |
| 1503 | unlink(cnf); |
| 1504 | return 0; |
| 1505 | } |
| 1506 | dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); |
| 1507 | if (dh == NULL) { |
| 1508 | rfbLog("openssl_init: PEM_read_bio_DHparams() failed.\n"); |
| 1509 | unlink(cnf); |
| 1510 | BIO_free(bio); |
| 1511 | return 0; |
| 1512 | } |
| 1513 | BIO_free(bio); |
| 1514 | SSL_CTX_set_tmp_dh(ctx, dh); |
| 1515 | rfbLog("loaded Diffie Hellman %d bits, %.3fs\n", 8*DH_size(dh), dnow()-ds); |
| 1516 | DH_free(dh); |
| 1517 | |
| 1518 | unlink(cnf); |
| 1519 | return 1; |
| 1520 | } |
| 1521 | |
| 1522 | static int switch_to_anon_dh(void) { |
| 1523 | long mode; |
| 1524 | |
| 1525 | rfbLog("Using Anonymous Diffie-Hellman mode.\n"); |
| 1526 | rfbLog("WARNING: Anonymous Diffie-Hellman uses encryption but is\n"); |
| 1527 | rfbLog("WARNING: susceptible to a Man-In-The-Middle attack.\n"); |
| 1528 | if (ssl_client_mode) { |
| 1529 | ctx = SSL_CTX_new( SSLv23_client_method() ); |
| 1530 | } else { |
| 1531 | ctx = SSL_CTX_new( SSLv23_server_method() ); |
| 1532 | } |
| 1533 | if (ctx == NULL) { |
| 1534 | return 0; |
| 1535 | } |
| 1536 | if (ssl_client_mode) { |
| 1537 | return 1; |
| 1538 | } |
| 1539 | if (!SSL_CTX_set_cipher_list(ctx, "ADH:@STRENGTH")) { |
| 1540 | return 0; |
| 1541 | } |
| 1542 | if (!add_anon_dh()) { |
| 1543 | return 0; |
| 1544 | } |
| 1545 | |
| 1546 | mode = 0; |
| 1547 | mode |= SSL_MODE_ENABLE_PARTIAL_WRITE; |
| 1548 | mode |= SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER; |
| 1549 | SSL_CTX_set_mode(ctx, mode); |
| 1550 | |
| 1551 | SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH); |
| 1552 | SSL_CTX_set_timeout(ctx, 300); |
| 1553 | SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_callback); |
| 1554 | SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL); |
| 1555 | |
| 1556 | return 1; |
| 1557 | } |
| 1558 | |
| 1559 | static int anontls_dialog(int s_in, int s_out) { |
| 1560 | |
| 1561 | if (s_in || s_out) {} |
| 1562 | anontls_selected = 1; |
| 1563 | |
| 1564 | if (!switch_to_anon_dh()) { |
| 1565 | rfbLog("anontls: Anonymous Diffie-Hellman failed.\n"); |
| 1566 | return 0; |
| 1567 | } |
| 1568 | |
| 1569 | /* continue with SSL/TLS */ |
| 1570 | return 1; |
| 1571 | } |
| 1572 | |
| 1573 | /* |
| 1574 | * Using spec: |
| 1575 | * http://www.mail-archive.com/qemu-devel@nongnu.org/msg08681.html |
| 1576 | */ |
| 1577 | static int vencrypt_dialog(int s_in, int s_out) { |
| 1578 | char buf[256], buf2[256]; |
| 1579 | int subtypes[16]; |
| 1580 | int n, i, ival, ok, nsubtypes = 0; |
| 1581 | |
| 1582 | vencrypt_selected = 0; |
| 1583 | |
| 1584 | /* send version 0.2 */ |
| 1585 | buf[0] = 0; |
| 1586 | buf[1] = 2; |
| 1587 | |
| 1588 | if (!write_exact(s_out, buf, 2)) { |
| 1589 | close(s_in); close(s_out); |
| 1590 | return 0; |
| 1591 | } |
| 1592 | |
| 1593 | /* read client version 0.2 */ |
| 1594 | memset(buf, 0, sizeof(buf)); |
| 1595 | if (!read_exact(s_in, buf, 2)) { |
| 1596 | close(s_in); close(s_out); |
| 1597 | return 0; |
| 1598 | } |
| 1599 | rfbLog("vencrypt: received %d.%d client version.\n", (int) buf[0], (int) buf[1]); |
| 1600 | |
| 1601 | /* close 0.0 */ |
| 1602 | if (buf[0] == 0 && buf[1] == 0) { |
| 1603 | rfbLog("vencrypt: received 0.0 version, closing connection.\n"); |
| 1604 | close(s_in); close(s_out); |
| 1605 | return 0; |
| 1606 | } |
| 1607 | |
| 1608 | /* accept only 0.2 */ |
| 1609 | if (buf[0] != 0 || buf[1] != 2) { |
| 1610 | rfbLog("vencrypt: unsupported VeNCrypt version, closing connection.\n"); |
| 1611 | buf[0] = (char) 255; |
| 1612 | write_exact(s_out, buf, 1); |
| 1613 | close(s_in); close(s_out); |
| 1614 | return 0; |
| 1615 | } |
| 1616 | |
| 1617 | /* tell them OK */ |
| 1618 | buf[0] = 0; |
| 1619 | if (!write_exact(s_out, buf, 1)) { |
| 1620 | close(s_in); close(s_out); |
| 1621 | return 0; |
| 1622 | } |
| 1623 | |
| 1624 | if (getenv("X11VNC_ENABLE_VENCRYPT_PLAIN_LOGIN")) { |
| 1625 | vencrypt_enable_plain_login = atoi(getenv("X11VNC_ENABLE_VENCRYPT_PLAIN_LOGIN")); |
| 1626 | } |
| 1627 | |
| 1628 | /* load our list of sub-types: */ |
| 1629 | n = 0; |
| 1630 | if (!ssl_verify && vencrypt_kx != VENCRYPT_NODH) { |
| 1631 | if (screen->authPasswdData != NULL) { |
| 1632 | subtypes[n++] = rfbVencryptTlsVnc; |
| 1633 | } else { |
| 1634 | if (vencrypt_enable_plain_login && unixpw) { |
| 1635 | subtypes[n++] = rfbVencryptTlsPlain; |
| 1636 | } else { |
| 1637 | subtypes[n++] = rfbVencryptTlsNone; |
| 1638 | } |
| 1639 | } |
| 1640 | } |
| 1641 | if (vencrypt_kx != VENCRYPT_NOX509) { |
| 1642 | if (screen->authPasswdData != NULL) { |
| 1643 | subtypes[n++] = rfbVencryptX509Vnc; |
| 1644 | } else { |
| 1645 | if (vencrypt_enable_plain_login && unixpw) { |
| 1646 | subtypes[n++] = rfbVencryptX509Plain; |
| 1647 | } else { |
| 1648 | subtypes[n++] = rfbVencryptX509None; |
| 1649 | } |
| 1650 | } |
| 1651 | } |
| 1652 | |
| 1653 | nsubtypes = n; |
| 1654 | for (i = 0; i < nsubtypes; i++) { |
| 1655 | ((uint32_t *)buf)[i] = Swap32IfLE(subtypes[i]); |
| 1656 | } |
| 1657 | |
| 1658 | /* send number first: */ |
| 1659 | buf2[0] = (char) nsubtypes; |
| 1660 | if (!write_exact(s_out, buf2, 1)) { |
| 1661 | close(s_in); close(s_out); |
| 1662 | return 0; |
| 1663 | } |
| 1664 | /* and now the list: */ |
| 1665 | if (!write_exact(s_out, buf, 4*n)) { |
| 1666 | close(s_in); close(s_out); |
| 1667 | return 0; |
| 1668 | } |
| 1669 | |
| 1670 | /* read client's selection: */ |
| 1671 | if (!read_exact(s_in, (char *)&ival, 4)) { |
| 1672 | close(s_in); close(s_out); |
| 1673 | return 0; |
| 1674 | } |
| 1675 | ival = Swap32IfLE(ival); |
| 1676 | |
| 1677 | /* zero means no dice: */ |
| 1678 | if (ival == 0) { |
| 1679 | rfbLog("vencrypt: client selected no sub-type, closing connection.\n"); |
| 1680 | close(s_in); close(s_out); |
| 1681 | return 0; |
| 1682 | } |
| 1683 | |
| 1684 | /* check if he selected a valid one: */ |
| 1685 | ok = 0; |
| 1686 | for (i = 0; i < nsubtypes; i++) { |
| 1687 | if (ival == subtypes[i]) { |
| 1688 | ok = 1; |
| 1689 | } |
| 1690 | } |
| 1691 | |
| 1692 | if (!ok) { |
| 1693 | rfbLog("vencrypt: client selected invalid sub-type: %d\n", ival); |
| 1694 | close(s_in); close(s_out); |
| 1695 | return 0; |
| 1696 | } else { |
| 1697 | char *st = "unknown!!"; |
| 1698 | if (ival == rfbVencryptTlsNone) st = "rfbVencryptTlsNone"; |
| 1699 | if (ival == rfbVencryptTlsVnc) st = "rfbVencryptTlsVnc"; |
| 1700 | if (ival == rfbVencryptTlsPlain) st = "rfbVencryptTlsPlain"; |
| 1701 | if (ival == rfbVencryptX509None) st = "rfbVencryptX509None"; |
| 1702 | if (ival == rfbVencryptX509Vnc) st = "rfbVencryptX509Vnc"; |
| 1703 | if (ival == rfbVencryptX509Plain) st = "rfbVencryptX509Plain"; |
| 1704 | rfbLog("vencrypt: client selected sub-type: %d (%s)\n", ival, st); |
| 1705 | } |
| 1706 | |
| 1707 | vencrypt_selected = ival; |
| 1708 | |
| 1709 | /* not documented in spec, send OK: */ |
| 1710 | buf[0] = 1; |
| 1711 | if (!write_exact(s_out, buf, 1)) { |
| 1712 | close(s_in); close(s_out); |
| 1713 | return 0; |
| 1714 | } |
| 1715 | |
| 1716 | if (vencrypt_selected == rfbVencryptTlsNone || |
| 1717 | vencrypt_selected == rfbVencryptTlsVnc || |
| 1718 | vencrypt_selected == rfbVencryptTlsPlain) { |
| 1719 | /* these modes are Anonymous Diffie-Hellman */ |
| 1720 | if (!switch_to_anon_dh()) { |
| 1721 | rfbLog("vencrypt: Anonymous Diffie-Hellman failed.\n"); |
| 1722 | return 0; |
| 1723 | } |
| 1724 | } |
| 1725 | |
| 1726 | /* continue with SSL/TLS */ |
| 1727 | return 1; |
| 1728 | } |
| 1729 | |
| 1730 | static int check_vnc_tls_mode(int s_in, int s_out, double last_https) { |
| 1731 | double waited = 0.0, waitmax = 1.4, dt = 0.01, start = dnow(); |
| 1732 | struct timeval tv; |
| 1733 | int input = 0, i, n, ok; |
| 1734 | int major, minor, sectype = -1; |
| 1735 | char *proto = "RFB 003.008\n"; |
| 1736 | char *stype = "unknown"; |
| 1737 | char buf[256]; |
| 1738 | |
| 1739 | vencrypt_selected = 0; |
| 1740 | anontls_selected = 0; |
| 1741 | |
| 1742 | if (vencrypt_mode == VENCRYPT_NONE && anontls_mode == ANONTLS_NONE) { |
| 1743 | /* only normal SSL */ |
| 1744 | return 1; |
| 1745 | } |
| 1746 | if (ssl_client_mode) { |
| 1747 | if (vencrypt_mode == VENCRYPT_FORCE || anontls_mode == ANONTLS_FORCE) { |
| 1748 | rfbLog("check_vnc_tls_mode: VENCRYPT_FORCE/ANONTLS_FORCE in client\n"); |
| 1749 | rfbLog("check_vnc_tls_mode: connect mode.\n"); |
| 1750 | /* this is OK, continue on below for dialog. */ |
| 1751 | } else { |
| 1752 | /* otherwise we must assume normal SSL (we send client hello) */ |
| 1753 | return 1; |
| 1754 | } |
| 1755 | } |
| 1756 | if (ssl_verify && vencrypt_mode != VENCRYPT_FORCE && anontls_mode == ANONTLS_FORCE) { |
| 1757 | rfbLog("check_vnc_tls_mode: Cannot use ANONTLS_FORCE with -sslverify (Anon DH only)\n"); |
| 1758 | /* fallback to normal SSL */ |
| 1759 | return 1; |
| 1760 | } |
| 1761 | |
| 1762 | if (last_https > 0.0) { |
| 1763 | double now = dnow(); |
| 1764 | if (now < last_https + 5.0) { |
| 1765 | waitmax = 20.0; |
| 1766 | } else if (now < last_https + 15.0) { |
| 1767 | waitmax = 10.0; |
| 1768 | } else if (now < last_https + 30.0) { |
| 1769 | waitmax = 5.0; |
| 1770 | } else if (now < last_https + 60.0) { |
| 1771 | waitmax = 2.5; |
| 1772 | } |
| 1773 | } |
| 1774 | |
| 1775 | while (waited < waitmax) { |
| 1776 | fd_set rfds; |
| 1777 | FD_ZERO(&rfds); |
| 1778 | FD_SET(s_in, &rfds); |
| 1779 | tv.tv_sec = 0; |
| 1780 | tv.tv_usec = 0; |
| 1781 | select(s_in+1, &rfds, NULL, NULL, &tv); |
| 1782 | if (FD_ISSET(s_in, &rfds)) { |
| 1783 | input = 1; |
| 1784 | break; |
| 1785 | } |
| 1786 | usleep((int) (1000 * 1000 * dt)); |
| 1787 | waited += dt; |
| 1788 | } |
| 1789 | rfbLog("check_vnc_tls_mode: waited: %f / %.2f input: %s\n", |
| 1790 | dnow() - start, waitmax, input ? "SSL Handshake" : "(future) RFB Handshake"); |
| 1791 | |
| 1792 | if (input) { |
| 1793 | /* got SSL client hello, can only assume normal SSL */ |
| 1794 | if (vencrypt_mode == VENCRYPT_FORCE || anontls_mode == ANONTLS_FORCE) { |
| 1795 | rfbLog("check_vnc_tls_mode: VENCRYPT_FORCE/ANONTLS_FORCE prevents normal SSL\n"); |
| 1796 | return 0; |
| 1797 | } |
| 1798 | return 1; |
| 1799 | } |
| 1800 | |
| 1801 | /* send RFB 003.008 -- there is no turning back from this point... */ |
| 1802 | if (!write_exact(s_out, proto, strlen(proto))) { |
| 1803 | close(s_in); close(s_out); |
| 1804 | return 0; |
| 1805 | } |
| 1806 | |
| 1807 | memset(buf, 0, sizeof(buf)); |
| 1808 | if (!read_exact(s_in, buf, 12)) { |
| 1809 | close(s_in); close(s_out); |
| 1810 | return 0; |
| 1811 | } |
| 1812 | |
| 1813 | if (sscanf(buf, "RFB %03d.%03d\n", &major, &minor) != 2) { |
| 1814 | int i; |
| 1815 | rfbLog("check_vnc_tls_mode: abnormal handshake: '%s'\nbytes: ", buf); |
| 1816 | for (i=0; i < 12; i++) { |
| 1817 | fprintf(stderr, "%d.", (unsigned char) buf[i]); |
| 1818 | } |
| 1819 | fprintf(stderr, "\n"); |
| 1820 | close(s_in); close(s_out); |
| 1821 | return 0; |
| 1822 | } |
| 1823 | rfbLog("check_vnc_tls_mode: version: %d.%d\n", major, minor); |
| 1824 | if (major != 3 || minor < 8) { |
| 1825 | rfbLog("check_vnc_tls_mode: invalid version: '%s'\n", buf); |
| 1826 | close(s_in); close(s_out); |
| 1827 | return 0; |
| 1828 | } |
| 1829 | |
| 1830 | n = 1; |
| 1831 | if (vencrypt_mode == VENCRYPT_FORCE) { |
| 1832 | buf[n++] = rfbSecTypeVencrypt; |
| 1833 | } else if (anontls_mode == ANONTLS_FORCE && !ssl_verify) { |
| 1834 | buf[n++] = rfbSecTypeAnonTls; |
| 1835 | } else if (vencrypt_mode == VENCRYPT_SOLE) { |
| 1836 | buf[n++] = rfbSecTypeVencrypt; |
| 1837 | } else if (anontls_mode == ANONTLS_SOLE && !ssl_verify) { |
| 1838 | buf[n++] = rfbSecTypeAnonTls; |
| 1839 | } else { |
| 1840 | if (vencrypt_mode == VENCRYPT_SUPPORT) { |
| 1841 | buf[n++] = rfbSecTypeVencrypt; |
| 1842 | } |
| 1843 | if (anontls_mode == ANONTLS_SUPPORT && !ssl_verify) { |
| 1844 | buf[n++] = rfbSecTypeAnonTls; |
| 1845 | } |
| 1846 | } |
| 1847 | |
| 1848 | n--; |
| 1849 | buf[0] = (char) n; |
| 1850 | if (!write_exact(s_out, buf, n+1)) { |
| 1851 | close(s_in); close(s_out); |
| 1852 | return 0; |
| 1853 | } |
| 1854 | if (0) fprintf(stderr, "wrote[%d] %d %d %d\n", n, buf[0], buf[1], buf[2]); |
| 1855 | |
| 1856 | buf[0] = 0; |
| 1857 | if (!read_exact(s_in, buf, 1)) { |
| 1858 | close(s_in); close(s_out); |
| 1859 | return 0; |
| 1860 | } |
| 1861 | |
| 1862 | if (buf[0] == rfbSecTypeVencrypt) stype = "VeNCrypt"; |
| 1863 | if (buf[0] == rfbSecTypeAnonTls) stype = "ANONTLS"; |
| 1864 | |
| 1865 | rfbLog("check_vnc_tls_mode: reply: %d (%s)\n", (int) buf[0], stype); |
| 1866 | |
| 1867 | ok = 0; |
| 1868 | for (i=1; i < n+1; i++) { |
| 1869 | if (buf[0] == buf[i]) { |
| 1870 | ok = 1; |
| 1871 | } |
| 1872 | } |
| 1873 | if (!ok) { |
| 1874 | char *msg = "check_vnc_tls_mode: invalid security-type"; |
| 1875 | int len = strlen(msg); |
| 1876 | rfbLog("%s: %d\n", msg, (int) buf[0]); |
| 1877 | ((uint32_t *)buf)[0] = Swap32IfLE(len); |
| 1878 | write_exact(s_out, buf, 4); |
| 1879 | write_exact(s_out, msg, strlen(msg)); |
| 1880 | close(s_in); close(s_out); |
| 1881 | return 0; |
| 1882 | } |
| 1883 | |
| 1884 | sectype = (int) buf[0]; |
| 1885 | |
| 1886 | if (sectype == rfbSecTypeVencrypt) { |
| 1887 | return vencrypt_dialog(s_in, s_out); |
| 1888 | } else if (sectype == rfbSecTypeAnonTls) { |
| 1889 | return anontls_dialog(s_in, s_out); |
| 1890 | } else { |
| 1891 | return 0; |
| 1892 | } |
| 1893 | } |
| 1894 | |
| 1895 | static void pr_ssl_info(int verb) { |
| 1896 | SSL_CIPHER *c; |
| 1897 | SSL_SESSION *s; |
| 1898 | char *proto = "unknown"; |
| 1899 | |
| 1900 | if (verb) {} |
| 1901 | |
| 1902 | if (ssl == NULL) { |
| 1903 | return; |
| 1904 | } |
| 1905 | c = SSL_get_current_cipher(ssl); |
| 1906 | s = SSL_get_session(ssl); |
| 1907 | |
| 1908 | if (s == NULL) { |
| 1909 | proto = "nosession"; |
| 1910 | } else if (s->ssl_version == SSL2_VERSION) { |
| 1911 | proto = "SSLv2"; |
| 1912 | } else if (s->ssl_version == SSL3_VERSION) { |
| 1913 | proto = "SSLv3"; |
| 1914 | } else if (s->ssl_version == TLS1_VERSION) { |
| 1915 | proto = "TLSv1"; |
| 1916 | } |
| 1917 | if (c != NULL) { |
| 1918 | rfbLog("SSL: ssl_helper[%d]: Cipher: %s %s Proto: %s\n", getpid(), |
| 1919 | SSL_CIPHER_get_version(c), SSL_CIPHER_get_name(c), proto); |
| 1920 | } else { |
| 1921 | rfbLog("SSL: ssl_helper[%d]: Proto: %s\n", getpid(), |
| 1922 | proto); |
| 1923 | } |
| 1924 | } |
| 1925 | |
| 1926 | static void ssl_timeout (int sig) { |
| 1927 | int i; |
| 1928 | rfbLog("sig: %d, ssl_init[%d] timed out.\n", sig, getpid()); |
| 1929 | rfbLog("To increase the SSL initialization timeout use, e.g.:\n"); |
| 1930 | rfbLog(" -env SSL_INIT_TIMEOUT=120 (for 120 seconds)\n"); |
| 1931 | for (i=0; i < 256; i++) { |
| 1932 | close(i); |
| 1933 | } |
| 1934 | exit(1); |
| 1935 | } |
| 1936 | |
| 1937 | static int ssl_init(int s_in, int s_out, int skip_vnc_tls, double last_https) { |
| 1938 | unsigned char *sid = (unsigned char *) "x11vnc SID"; |
| 1939 | char *name = NULL; |
| 1940 | int peerport = 0; |
| 1941 | int db = 0, rc, err; |
| 1942 | int ssock = s_in; |
| 1943 | double start = dnow(); |
| 1944 | int timeout = 20; |
| 1945 | |
| 1946 | if (enc_str != NULL) { |
| 1947 | return 1; |
| 1948 | } |
| 1949 | if (getenv("SSL_DEBUG")) { |
| 1950 | db = atoi(getenv("SSL_DEBUG")); |
| 1951 | } |
| 1952 | usleep(100 * 1000); |
| 1953 | if (getenv("SSL_INIT_TIMEOUT")) { |
| 1954 | timeout = atoi(getenv("SSL_INIT_TIMEOUT")); |
| 1955 | } else if (client_connect != NULL && strstr(client_connect, "repeater")) { |
| 1956 | rfbLog("SSL: ssl_init[%d]: detected 'repeater' in connect string.\n", getpid()); |
| 1957 | rfbLog("SSL: setting timeout to 1 hour: -env SSL_INIT_TIMEOUT=3600\n"); |
| 1958 | rfbLog("SSL: use that option to set a different timeout value,\n"); |
| 1959 | rfbLog("SSL: however note that with Windows UltraVNC repeater it\n"); |
| 1960 | rfbLog("SSL: may timeout before your setting due to other reasons.\n"); |
| 1961 | timeout = 3600; |
| 1962 | } |
| 1963 | |
| 1964 | if (skip_vnc_tls) { |
| 1965 | rfbLog("SSL: ssl_helper[%d]: HTTPS mode, skipping check_vnc_tls_mode()\n", |
| 1966 | getpid()); |
| 1967 | } else if (!check_vnc_tls_mode(s_in, s_out, last_https)) { |
| 1968 | return 0; |
| 1969 | } |
| 1970 | rfbLog("SSL: ssl_init[%d]: %d/%d initialization timeout: %d secs.\n", |
| 1971 | getpid(), s_in, s_out, timeout); |
| 1972 | |
| 1973 | ssl = SSL_new(ctx); |
| 1974 | if (ssl == NULL) { |
| 1975 | fprintf(stderr, "SSL_new failed\n"); |
| 1976 | return 0; |
| 1977 | } |
| 1978 | if (db > 1) fprintf(stderr, "ssl_init: 1\n"); |
| 1979 | |
| 1980 | SSL_set_session_id_context(ssl, sid, strlen((char *)sid)); |
| 1981 | |
| 1982 | if (s_in == s_out) { |
| 1983 | if (! SSL_set_fd(ssl, ssock)) { |
| 1984 | fprintf(stderr, "SSL_set_fd failed\n"); |
| 1985 | return 0; |
| 1986 | } |
| 1987 | } else { |
| 1988 | if (! SSL_set_rfd(ssl, s_in)) { |
| 1989 | fprintf(stderr, "SSL_set_rfd failed\n"); |
| 1990 | return 0; |
| 1991 | } |
| 1992 | if (! SSL_set_wfd(ssl, s_out)) { |
| 1993 | fprintf(stderr, "SSL_set_wfd failed\n"); |
| 1994 | return 0; |
| 1995 | } |
| 1996 | } |
| 1997 | if (db > 1) fprintf(stderr, "ssl_init: 2\n"); |
| 1998 | |
| 1999 | if (ssl_client_mode) { |
| 2000 | SSL_set_connect_state(ssl); |
| 2001 | } else { |
| 2002 | SSL_set_accept_state(ssl); |
| 2003 | } |
| 2004 | |
| 2005 | if (db > 1) fprintf(stderr, "ssl_init: 3\n"); |
| 2006 | |
| 2007 | name = get_remote_host(ssock); |
| 2008 | peerport = get_remote_port(ssock); |
| 2009 | |
| 2010 | if (!strcmp(name, "0.0.0.0") && openssl_last_ip != NULL) { |
| 2011 | name = strdup(openssl_last_ip); |
| 2012 | } |
| 2013 | |
| 2014 | if (db > 1) fprintf(stderr, "ssl_init: 4\n"); |
| 2015 | |
| 2016 | while (1) { |
| 2017 | |
| 2018 | signal(SIGALRM, ssl_timeout); |
| 2019 | alarm(timeout); |
| 2020 | |
| 2021 | if (ssl_client_mode) { |
| 2022 | if (db) fprintf(stderr, "calling SSL_connect...\n"); |
| 2023 | rc = SSL_connect(ssl); |
| 2024 | } else { |
| 2025 | if (db) fprintf(stderr, "calling SSL_accept...\n"); |
| 2026 | rc = SSL_accept(ssl); |
| 2027 | } |
| 2028 | err = SSL_get_error(ssl, rc); |
| 2029 | |
| 2030 | alarm(0); |
| 2031 | signal(SIGALRM, SIG_DFL); |
| 2032 | |
| 2033 | if (ssl_client_mode) { |
| 2034 | if (db) fprintf(stderr, "SSL_connect %d/%d\n", rc, err); |
| 2035 | } else { |
| 2036 | if (db) fprintf(stderr, "SSL_accept %d/%d\n", rc, err); |
| 2037 | } |
| 2038 | if (err == SSL_ERROR_NONE) { |
| 2039 | break; |
| 2040 | } else if (err == SSL_ERROR_WANT_READ) { |
| 2041 | |
| 2042 | if (db) fprintf(stderr, "got SSL_ERROR_WANT_READ\n"); |
| 2043 | rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 1\n", |
| 2044 | getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport); |
| 2045 | pr_ssl_info(1); |
| 2046 | return 0; |
| 2047 | |
| 2048 | } else if (err == SSL_ERROR_WANT_WRITE) { |
| 2049 | |
| 2050 | if (db) fprintf(stderr, "got SSL_ERROR_WANT_WRITE\n"); |
| 2051 | rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 2\n", |
| 2052 | getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport); |
| 2053 | pr_ssl_info(1); |
| 2054 | return 0; |
| 2055 | |
| 2056 | } else if (err == SSL_ERROR_SYSCALL) { |
| 2057 | |
| 2058 | if (db) fprintf(stderr, "got SSL_ERROR_SYSCALL\n"); |
| 2059 | rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 3\n", |
| 2060 | getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport); |
| 2061 | pr_ssl_info(1); |
| 2062 | return 0; |
| 2063 | |
| 2064 | } else if (err == SSL_ERROR_ZERO_RETURN) { |
| 2065 | |
| 2066 | if (db) fprintf(stderr, "got SSL_ERROR_ZERO_RETURN\n"); |
| 2067 | rfbLog("SSL: ssl_helper[%d]: %s() failed for: %s:%d 4\n", |
| 2068 | getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", name, peerport); |
| 2069 | pr_ssl_info(1); |
| 2070 | return 0; |
| 2071 | |
| 2072 | } else if (rc < 0) { |
| 2073 | unsigned long err; |
| 2074 | int cnt = 0; |
| 2075 | |
| 2076 | rfbLog("SSL: ssl_helper[%d]: %s() *FATAL: %d SSL FAILED\n", |
| 2077 | getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept", rc); |
| 2078 | while ((err = ERR_get_error()) != 0) { |
| 2079 | rfbLog("SSL: %s\n", ERR_error_string(err, NULL)); |
| 2080 | if (cnt++ > 100) { |
| 2081 | break; |
| 2082 | } |
| 2083 | } |
| 2084 | pr_ssl_info(1); |
| 2085 | return 0; |
| 2086 | |
| 2087 | } else if (dnow() > start + 3.0) { |
| 2088 | |
| 2089 | rfbLog("SSL: ssl_helper[%d]: timeout looping %s() " |
| 2090 | "fatal.\n", getpid(), ssl_client_mode ? "SSL_connect" : "SSL_accept"); |
| 2091 | pr_ssl_info(1); |
| 2092 | return 0; |
| 2093 | |
| 2094 | } else { |
| 2095 | BIO *bio = SSL_get_rbio(ssl); |
| 2096 | if (bio == NULL) { |
| 2097 | rfbLog("SSL: ssl_helper[%d]: ssl BIO is null. " |
| 2098 | "fatal.\n", getpid()); |
| 2099 | pr_ssl_info(1); |
| 2100 | return 0; |
| 2101 | } |
| 2102 | if (BIO_eof(bio)) { |
| 2103 | rfbLog("SSL: ssl_helper[%d]: ssl BIO is EOF. " |
| 2104 | "fatal.\n", getpid()); |
| 2105 | pr_ssl_info(1); |
| 2106 | return 0; |
| 2107 | } |
| 2108 | } |
| 2109 | usleep(10 * 1000); |
| 2110 | } |
| 2111 | |
| 2112 | if (ssl_client_mode) { |
| 2113 | rfbLog("SSL: ssl_helper[%d]: SSL_connect() succeeded for: %s:%d\n", getpid(), name, peerport); |
| 2114 | } else { |
| 2115 | rfbLog("SSL: ssl_helper[%d]: SSL_accept() succeeded for: %s:%d\n", getpid(), name, peerport); |
| 2116 | } |
| 2117 | |
| 2118 | pr_ssl_info(0); |
| 2119 | |
| 2120 | if (SSL_get_verify_result(ssl) == X509_V_OK) { |
| 2121 | X509 *x; |
| 2122 | FILE *cr = NULL; |
| 2123 | if (certret != NULL) { |
| 2124 | cr = fopen(certret, "w"); |
| 2125 | } |
| 2126 | |
| 2127 | x = SSL_get_peer_certificate(ssl); |
| 2128 | if (x == NULL) { |
| 2129 | rfbLog("SSL: ssl_helper[%d]: accepted client %s x509 peer cert is null\n", getpid(), name); |
| 2130 | if (cr != NULL) { |
| 2131 | fprintf(cr, "NOCERT\n"); |
| 2132 | fclose(cr); |
| 2133 | } |
| 2134 | } else { |
| 2135 | rfbLog("SSL: ssl_helper[%d]: accepted client %s x509 cert is:\n", getpid(), name); |
| 2136 | #if LIBVNCSERVER_HAVE_X509_PRINT_EX_FP |
| 2137 | X509_print_ex_fp(stderr, x, 0, XN_FLAG_MULTILINE); |
| 2138 | #endif |
| 2139 | if (cr != NULL) { |
| 2140 | #if LIBVNCSERVER_HAVE_X509_PRINT_EX_FP |
| 2141 | X509_print_ex_fp(cr, x, 0, XN_FLAG_MULTILINE); |
| 2142 | #else |
| 2143 | rfbLog("** not compiled with libssl X509_print_ex_fp() function **\n"); |
| 2144 | if (users_list && strstr(users_list, "sslpeer=")) { |
| 2145 | rfbLog("** -users sslpeer= will not work! **\n"); |
| 2146 | } |
| 2147 | #endif |
| 2148 | fclose(cr); |
| 2149 | } |
| 2150 | } |
| 2151 | } |
| 2152 | free(name); |
| 2153 | |
| 2154 | return 1; |
| 2155 | } |
| 2156 | |
| 2157 | static void symmetric_encryption_xfer(int csock, int s_in, int s_out); |
| 2158 | |
| 2159 | static void ssl_xfer(int csock, int s_in, int s_out, int is_https) { |
| 2160 | int dbxfer = 0, db = 0, check_pending, fdmax, nfd, n, i, err; |
| 2161 | char cbuf[ABSIZE], sbuf[ABSIZE]; |
| 2162 | int cptr, sptr, c_rd, c_wr, s_rd, s_wr; |
| 2163 | fd_set rd, wr; |
| 2164 | struct timeval tv; |
| 2165 | int ssock, cnt = 0, ndata = 0; |
| 2166 | |
| 2167 | /* |
| 2168 | * we want to switch to a longer timeout for long term VNC |
| 2169 | * connections (in case the network is not working for periods of |
| 2170 | * time), but we also want the timeout shorter at the beginning |
| 2171 | * in case the client went away. |
| 2172 | */ |
| 2173 | double start, now; |
| 2174 | int tv_https_early = 60; |
| 2175 | int tv_https_later = 20; |
| 2176 | int tv_vnc_early = 40; |
| 2177 | int tv_vnc_later = 43200; /* was 300, stunnel: 43200 */ |
| 2178 | int tv_cutover = 70; |
| 2179 | int tv_closing = 60; |
| 2180 | int tv_use; |
| 2181 | |
| 2182 | if (dbxfer) { |
| 2183 | raw_xfer(csock, s_in, s_out); |
| 2184 | return; |
| 2185 | } |
| 2186 | if (enc_str != NULL) { |
| 2187 | if (!strcmp(enc_str, "none")) { |
| 2188 | usleep(250*1000); |
| 2189 | rfbLog("doing '-enc none' raw transfer (no encryption)\n"); |
| 2190 | raw_xfer(csock, s_in, s_out); |
| 2191 | } else { |
| 2192 | symmetric_encryption_xfer(csock, s_in, s_out); |
| 2193 | } |
| 2194 | return; |
| 2195 | } |
| 2196 | |
| 2197 | if (getenv("SSL_DEBUG")) { |
| 2198 | db = atoi(getenv("SSL_DEBUG")); |
| 2199 | } |
| 2200 | |
| 2201 | if (db) fprintf(stderr, "ssl_xfer begin\n"); |
| 2202 | |
| 2203 | start = dnow(); |
| 2204 | if (is_https) { |
| 2205 | tv_use = tv_https_early; |
| 2206 | } else { |
| 2207 | tv_use = tv_vnc_early; |
| 2208 | } |
| 2209 | |
| 2210 | |
| 2211 | /* |
| 2212 | * csock: clear text socket with libvncserver. "C" |
| 2213 | * ssock: ssl data socket with remote vnc viewer. "S" |
| 2214 | * |
| 2215 | * to cover inetd mode, we have s_in and s_out, but in non-inetd |
| 2216 | * mode they both ssock. |
| 2217 | * |
| 2218 | * cbuf[] is data from csock that we have read but not passed on to ssl |
| 2219 | * sbuf[] is data from ssl that we have read but not passed on to csock |
| 2220 | */ |
| 2221 | for (i=0; i<ABSIZE; i++) { |
| 2222 | cbuf[i] = '\0'; |
| 2223 | sbuf[i] = '\0'; |
| 2224 | } |
| 2225 | |
| 2226 | if (s_out > s_in) { |
| 2227 | ssock = s_out; |
| 2228 | } else { |
| 2229 | ssock = s_in; |
| 2230 | } |
| 2231 | |
| 2232 | if (csock > ssock) { |
| 2233 | fdmax = csock; |
| 2234 | } else { |
| 2235 | fdmax = ssock; |
| 2236 | } |
| 2237 | |
| 2238 | c_rd = 1; /* clear text (libvncserver) socket open for reading */ |
| 2239 | c_wr = 1; /* clear text (libvncserver) socket open for writing */ |
| 2240 | s_rd = 1; /* ssl data (remote client) socket open for reading */ |
| 2241 | s_wr = 1; /* ssl data (remote client) socket open for writing */ |
| 2242 | |
| 2243 | cptr = 0; /* offsets into ABSIZE buffers */ |
| 2244 | sptr = 0; |
| 2245 | |
| 2246 | if (vencrypt_selected > 0 || anontls_selected > 0) { |
| 2247 | char tmp[16]; |
| 2248 | /* read and discard the extra RFB version */ |
| 2249 | memset(tmp, 0, sizeof(tmp)); |
| 2250 | read(csock, tmp, 12); |
| 2251 | if (0) fprintf(stderr, "extra: %s\n", tmp); |
| 2252 | } |
| 2253 | |
| 2254 | while (1) { |
| 2255 | int c_to_s, s_to_c, closing; |
| 2256 | |
| 2257 | if ( s_wr && (c_rd || cptr > 0) ) { |
| 2258 | /* |
| 2259 | * S is writable and |
| 2260 | * C is readable or some cbuf data remaining |
| 2261 | */ |
| 2262 | c_to_s = 1; |
| 2263 | } else { |
| 2264 | c_to_s = 0; |
| 2265 | } |
| 2266 | |
| 2267 | if ( c_wr && (s_rd || sptr > 0) ) { |
| 2268 | /* |
| 2269 | * C is writable and |
| 2270 | * S is readable or some sbuf data remaining |
| 2271 | */ |
| 2272 | s_to_c = 1; |
| 2273 | } else { |
| 2274 | s_to_c = 0; |
| 2275 | } |
| 2276 | |
| 2277 | if (! c_to_s && ! s_to_c) { |
| 2278 | /* |
| 2279 | * nothing can be sent either direction. |
| 2280 | * break out of the loop to finish all work. |
| 2281 | */ |
| 2282 | break; |
| 2283 | } |
| 2284 | cnt++; |
| 2285 | |
| 2286 | /* set up the fd sets for the two sockets for read & write: */ |
| 2287 | |
| 2288 | FD_ZERO(&rd); |
| 2289 | |
| 2290 | if (c_rd && cptr < ABSIZE) { |
| 2291 | /* we could read more from C since cbuf is not full */ |
| 2292 | FD_SET(csock, &rd); |
| 2293 | } |
| 2294 | if (s_rd) { |
| 2295 | /* |
| 2296 | * we could read more from S since sbuf not full, |
| 2297 | * OR ssl is waiting for more BIO to be able to |
| 2298 | * read and we have some C data still buffered. |
| 2299 | */ |
| 2300 | if (sptr < ABSIZE || (cptr > 0 && SSL_want_read(ssl))) { |
| 2301 | FD_SET(s_in, &rd); |
| 2302 | } |
| 2303 | } |
| 2304 | |
| 2305 | FD_ZERO(&wr); |
| 2306 | |
| 2307 | if (c_wr && sptr > 0) { |
| 2308 | /* we could write more to C since sbuf is not empty */ |
| 2309 | FD_SET(csock, &wr); |
| 2310 | } |
| 2311 | if (s_wr) { |
| 2312 | /* |
| 2313 | * we could write more to S since cbuf not empty, |
| 2314 | * OR ssl is waiting for more BIO to be able |
| 2315 | * write and we haven't filled up sbuf yet. |
| 2316 | */ |
| 2317 | if (cptr > 0 || (sptr < ABSIZE && SSL_want_write(ssl))) { |
| 2318 | FD_SET(s_out, &wr); |
| 2319 | } |
| 2320 | } |
| 2321 | |
| 2322 | now = dnow(); |
| 2323 | if (tv_cutover && now > start + tv_cutover) { |
| 2324 | rfbLog("SSL: ssl_xfer[%d]: tv_cutover: %d\n", getpid(), |
| 2325 | tv_cutover); |
| 2326 | tv_cutover = 0; |
| 2327 | if (is_https) { |
| 2328 | tv_use = tv_https_later; |
| 2329 | } else { |
| 2330 | tv_use = tv_vnc_later; |
| 2331 | } |
| 2332 | /* try to clean out some zombies if we can. */ |
| 2333 | ssl_helper_pid(0, -2); |
| 2334 | } |
| 2335 | if (ssl_timeout_secs > 0) { |
| 2336 | tv_use = ssl_timeout_secs; |
| 2337 | } |
| 2338 | |
| 2339 | if ( (s_rd && c_rd) || cptr || sptr) { |
| 2340 | closing = 0; |
| 2341 | } else { |
| 2342 | closing = 1; |
| 2343 | tv_use = tv_closing; |
| 2344 | } |
| 2345 | |
| 2346 | tv.tv_sec = tv_use; |
| 2347 | tv.tv_usec = 0; |
| 2348 | |
| 2349 | /* do the select, repeat if interrupted */ |
| 2350 | do { |
| 2351 | if (ssl_timeout_secs == 0) { |
| 2352 | nfd = select(fdmax+1, &rd, &wr, NULL, NULL); |
| 2353 | } else { |
| 2354 | nfd = select(fdmax+1, &rd, &wr, NULL, &tv); |
| 2355 | } |
| 2356 | } while (nfd < 0 && errno == EINTR); |
| 2357 | |
| 2358 | if (db > 1) fprintf(stderr, "nfd: %d\n", nfd); |
| 2359 | |
| 2360 | if (0) fprintf(stderr, "nfd[%d]: %d w/r csock: %d %d s_in: %d %d\n", getpid(), nfd, FD_ISSET(csock, &wr), FD_ISSET(csock, &rd), FD_ISSET(s_out, &wr), FD_ISSET(s_in, &rd)); |
| 2361 | |
| 2362 | if (nfd < 0) { |
| 2363 | rfbLog("SSL: ssl_xfer[%d]: select error: %d\n", getpid(), nfd); |
| 2364 | perror("select"); |
| 2365 | /* connection finished */ |
| 2366 | goto done; |
| 2367 | } |
| 2368 | |
| 2369 | if (nfd == 0) { |
| 2370 | if (!closing && tv_cutover && ndata > 25000) { |
| 2371 | static int cn = 0; |
| 2372 | /* probably ok, early windows iconify */ |
| 2373 | if (cn++ < 2) { |
| 2374 | rfbLog("SSL: ssl_xfer[%d]: early time" |
| 2375 | "out: %d\n", getpid(), ndata); |
| 2376 | } |
| 2377 | continue; |
| 2378 | } |
| 2379 | rfbLog("SSL: ssl_xfer[%d]: connection timedout. %d tv_use: %d\n", |
| 2380 | getpid(), ndata, tv_use); |
| 2381 | /* connection finished */ |
| 2382 | goto done; |
| 2383 | } |
| 2384 | |
| 2385 | /* used to see if SSL_pending() should be checked: */ |
| 2386 | check_pending = 0; |
| 2387 | /* AUDIT */ |
| 2388 | |
| 2389 | if (c_wr && FD_ISSET(csock, &wr)) { |
| 2390 | |
| 2391 | /* try to write some of our sbuf to C: */ |
| 2392 | n = write(csock, sbuf, sptr); |
| 2393 | |
| 2394 | if (n < 0) { |
| 2395 | if (errno != EINTR) { |
| 2396 | /* connection finished */ |
| 2397 | goto done; |
| 2398 | } |
| 2399 | /* proceed */ |
| 2400 | } else if (n == 0) { |
| 2401 | /* connection finished XXX double check */ |
| 2402 | goto done; |
| 2403 | } else { |
| 2404 | /* shift over the data in sbuf by n */ |
| 2405 | memmove(sbuf, sbuf + n, sptr - n); |
| 2406 | if (sptr == ABSIZE) { |
| 2407 | check_pending = 1; |
| 2408 | } |
| 2409 | sptr -= n; |
| 2410 | |
| 2411 | if (! s_rd && sptr == 0) { |
| 2412 | /* finished sending last of sbuf */ |
| 2413 | shutdown(csock, SHUT_WR); |
| 2414 | c_wr = 0; |
| 2415 | } |
| 2416 | ndata += n; |
| 2417 | } |
| 2418 | } |
| 2419 | |
| 2420 | if (s_wr) { |
| 2421 | if ((cptr > 0 && FD_ISSET(s_out, &wr)) || |
| 2422 | (SSL_want_read(ssl) && FD_ISSET(s_in, &rd))) { |
| 2423 | |
| 2424 | /* try to write some of our cbuf to S: */ |
| 2425 | |
| 2426 | n = SSL_write(ssl, cbuf, cptr); |
| 2427 | err = SSL_get_error(ssl, n); |
| 2428 | |
| 2429 | if (err == SSL_ERROR_NONE) { |
| 2430 | /* shift over the data in cbuf by n */ |
| 2431 | memmove(cbuf, cbuf + n, cptr - n); |
| 2432 | cptr -= n; |
| 2433 | |
| 2434 | if (! c_rd && cptr == 0 && s_wr) { |
| 2435 | /* finished sending last cbuf */ |
| 2436 | SSL_shutdown(ssl); |
| 2437 | s_wr = 0; |
| 2438 | } |
| 2439 | ndata += n; |
| 2440 | |
| 2441 | } else if (err == SSL_ERROR_WANT_WRITE |
| 2442 | || err == SSL_ERROR_WANT_READ |
| 2443 | || err == SSL_ERROR_WANT_X509_LOOKUP) { |
| 2444 | |
| 2445 | ; /* proceed */ |
| 2446 | |
| 2447 | } else if (err == SSL_ERROR_SYSCALL) { |
| 2448 | if (n < 0 && errno != EINTR) { |
| 2449 | /* connection finished */ |
| 2450 | goto done; |
| 2451 | } |
| 2452 | /* proceed */ |
| 2453 | } else if (err == SSL_ERROR_ZERO_RETURN) { |
| 2454 | /* S finished */ |
| 2455 | s_rd = 0; |
| 2456 | s_wr = 0; |
| 2457 | } else if (err == SSL_ERROR_SSL) { |
| 2458 | /* connection finished */ |
| 2459 | goto done; |
| 2460 | } |
| 2461 | } |
| 2462 | } |
| 2463 | |
| 2464 | if (c_rd && FD_ISSET(csock, &rd)) { |
| 2465 | |
| 2466 | |
| 2467 | /* try to read some data from C into our cbuf */ |
| 2468 | |
| 2469 | n = read(csock, cbuf + cptr, ABSIZE - cptr); |
| 2470 | |
| 2471 | if (n < 0) { |
| 2472 | if (errno != EINTR) { |
| 2473 | /* connection finished */ |
| 2474 | goto done; |
| 2475 | } |
| 2476 | /* proceed */ |
| 2477 | } else if (n == 0) { |
| 2478 | /* C is EOF */ |
| 2479 | c_rd = 0; |
| 2480 | if (cptr == 0 && s_wr) { |
| 2481 | /* and no more in cbuf to send */ |
| 2482 | SSL_shutdown(ssl); |
| 2483 | s_wr = 0; |
| 2484 | } |
| 2485 | } else { |
| 2486 | /* good */ |
| 2487 | |
| 2488 | cptr += n; |
| 2489 | ndata += n; |
| 2490 | } |
| 2491 | } |
| 2492 | |
| 2493 | if (s_rd) { |
| 2494 | if ((sptr < ABSIZE && FD_ISSET(s_in, &rd)) || |
| 2495 | (SSL_want_write(ssl) && FD_ISSET(s_out, &wr)) || |
| 2496 | (check_pending && SSL_pending(ssl))) { |
| 2497 | |
| 2498 | /* try to read some data from S into our sbuf */ |
| 2499 | |
| 2500 | n = SSL_read(ssl, sbuf + sptr, ABSIZE - sptr); |
| 2501 | err = SSL_get_error(ssl, n); |
| 2502 | |
| 2503 | if (err == SSL_ERROR_NONE) { |
| 2504 | /* good */ |
| 2505 | |
| 2506 | sptr += n; |
| 2507 | ndata += n; |
| 2508 | |
| 2509 | } else if (err == SSL_ERROR_WANT_WRITE |
| 2510 | || err == SSL_ERROR_WANT_READ |
| 2511 | || err == SSL_ERROR_WANT_X509_LOOKUP) { |
| 2512 | |
| 2513 | ; /* proceed */ |
| 2514 | |
| 2515 | } else if (err == SSL_ERROR_SYSCALL) { |
| 2516 | if (n < 0) { |
| 2517 | if(errno != EINTR) { |
| 2518 | /* connection finished */ |
| 2519 | goto done; |
| 2520 | } |
| 2521 | /* proceed */ |
| 2522 | } else { |
| 2523 | /* S finished */ |
| 2524 | s_rd = 0; |
| 2525 | s_wr = 0; |
| 2526 | } |
| 2527 | } else if (err == SSL_ERROR_ZERO_RETURN) { |
| 2528 | /* S is EOF */ |
| 2529 | s_rd = 0; |
| 2530 | if (cptr == 0 && s_wr) { |
| 2531 | /* and no more in cbuf to send */ |
| 2532 | SSL_shutdown(ssl); |
| 2533 | s_wr = 0; |
| 2534 | } |
| 2535 | if (sptr == 0 && c_wr) { |
| 2536 | /* and no more in sbuf to send */ |
| 2537 | shutdown(csock, SHUT_WR); |
| 2538 | c_wr = 0; |
| 2539 | } |
| 2540 | } else if (err == SSL_ERROR_SSL) { |
| 2541 | /* connection finished */ |
| 2542 | goto done; |
| 2543 | } |
| 2544 | } |
| 2545 | } |
| 2546 | } |
| 2547 | |
| 2548 | done: |
| 2549 | rfbLog("SSL: ssl_xfer[%d]: closing sockets %d, %d, %d\n", |
| 2550 | getpid(), csock, s_in, s_out); |
| 2551 | close(csock); |
| 2552 | close(s_in); |
| 2553 | close(s_out); |
| 2554 | return; |
| 2555 | } |
| 2556 | |
| 2557 | #define MSZ 4096 |
| 2558 | static void init_prng(void) { |
| 2559 | int db = 0, bytes, ubytes, fd; |
| 2560 | char file[MSZ], dtmp[100]; |
| 2561 | unsigned int sr; |
| 2562 | |
| 2563 | RAND_file_name(file, MSZ); |
| 2564 | |
| 2565 | rfbLog("RAND_file_name: %s\n", file); |
| 2566 | |
| 2567 | bytes = RAND_load_file(file, -1); |
| 2568 | if (db) fprintf(stderr, "bytes read: %d\n", bytes); |
| 2569 | |
| 2570 | ubytes = RAND_load_file("/dev/urandom", 64); |
| 2571 | bytes += ubytes; |
| 2572 | if (db) fprintf(stderr, "bytes read: %d / %d\n", bytes, ubytes); |
| 2573 | |
| 2574 | /* mix in more predictable stuff as well for fallback */ |
| 2575 | sprintf(dtmp, "/tmp/p%.8f.XXXXXX", dnow()); |
| 2576 | fd = mkstemp(dtmp); |
| 2577 | RAND_add(dtmp, strlen(dtmp), 0); |
| 2578 | if (fd >= 0) { |
| 2579 | close(fd); |
| 2580 | unlink(dtmp); |
| 2581 | } |
| 2582 | sprintf(dtmp, "%d-%.8f", (int) getpid(), dnow()); |
| 2583 | RAND_add(dtmp, strlen(dtmp), 0); |
| 2584 | |
| 2585 | if (!RAND_status()) { |
| 2586 | ubytes = -1; |
| 2587 | rfbLog("calling RAND_poll()\n"); |
| 2588 | RAND_poll(); |
| 2589 | } |
| 2590 | |
| 2591 | RAND_bytes((unsigned char *)&sr, 4); |
| 2592 | srand(sr); |
| 2593 | |
| 2594 | if (bytes > 0) { |
| 2595 | if (! quiet) { |
| 2596 | rfbLog("initialized PRNG with %d random bytes.\n", |
| 2597 | bytes); |
| 2598 | } |
| 2599 | if (ubytes > 32 && rnow() < 0.25) { |
| 2600 | RAND_write_file(file); |
| 2601 | } |
| 2602 | return; |
| 2603 | } |
| 2604 | |
| 2605 | bytes += RAND_load_file("/dev/random", 8); |
| 2606 | if (db) fprintf(stderr, "bytes read: %d\n", bytes); |
| 2607 | RAND_poll(); |
| 2608 | |
| 2609 | if (! quiet) { |
| 2610 | rfbLog("initialized PRNG with %d random bytes.\n", bytes); |
| 2611 | } |
| 2612 | } |
| 2613 | #endif /* FORK_OK */ |
| 2614 | #endif /* LIBVNCSERVER_HAVE_LIBSSL */ |
| 2615 | |
| 2616 | void check_openssl(void) { |
| 2617 | fd_set fds; |
| 2618 | struct timeval tv; |
| 2619 | int nfds, nmax = openssl_sock; |
| 2620 | static time_t last_waitall = 0; |
| 2621 | static double last_check = 0.0; |
| 2622 | double now; |
| 2623 | |
| 2624 | if (! use_openssl) { |
| 2625 | return; |
| 2626 | } |
| 2627 | |
| 2628 | if (time(NULL) > last_waitall + 120) { |
| 2629 | last_waitall = time(NULL); |
| 2630 | ssl_helper_pid(0, -2); /* waitall */ |
| 2631 | } |
| 2632 | |
| 2633 | if (openssl_sock < 0 && openssl_sock6 < 0) { |
| 2634 | return; |
| 2635 | } |
| 2636 | |
| 2637 | now = dnow(); |
| 2638 | if (now < last_check + 0.5) { |
| 2639 | return; |
| 2640 | } |
| 2641 | last_check = now; |
| 2642 | |
| 2643 | FD_ZERO(&fds); |
| 2644 | if (openssl_sock >= 0) { |
| 2645 | FD_SET(openssl_sock, &fds); |
| 2646 | } |
| 2647 | if (openssl_sock6 >= 0) { |
| 2648 | FD_SET(openssl_sock6, &fds); |
| 2649 | if (openssl_sock6 > openssl_sock) { |
| 2650 | nmax = openssl_sock6; |
| 2651 | } |
| 2652 | } |
| 2653 | |
| 2654 | tv.tv_sec = 0; |
| 2655 | tv.tv_usec = 0; |
| 2656 | |
| 2657 | nfds = select(nmax+1, &fds, NULL, NULL, &tv); |
| 2658 | |
| 2659 | if (nfds <= 0) { |
| 2660 | return; |
| 2661 | } |
| 2662 | |
| 2663 | if (openssl_sock >= 0 && FD_ISSET(openssl_sock, &fds)) { |
| 2664 | rfbLog("SSL: accept_openssl(OPENSSL_VNC)\n"); |
| 2665 | accept_openssl(OPENSSL_VNC, -1); |
| 2666 | } |
| 2667 | if (openssl_sock6 >= 0 && FD_ISSET(openssl_sock6, &fds)) { |
| 2668 | rfbLog("SSL: accept_openssl(OPENSSL_VNC6)\n"); |
| 2669 | accept_openssl(OPENSSL_VNC6, -1); |
| 2670 | } |
| 2671 | } |
| 2672 | |
| 2673 | void check_https(void) { |
| 2674 | fd_set fds; |
| 2675 | struct timeval tv; |
| 2676 | int nfds, nmax = https_sock; |
| 2677 | static double last_check = 0.0; |
| 2678 | double now; |
| 2679 | |
| 2680 | if (! use_openssl || (https_sock < 0 && https_sock6 < 0)) { |
| 2681 | return; |
| 2682 | } |
| 2683 | |
| 2684 | now = dnow(); |
| 2685 | if (now < last_check + 0.5) { |
| 2686 | return; |
| 2687 | } |
| 2688 | last_check = now; |
| 2689 | |
| 2690 | FD_ZERO(&fds); |
| 2691 | if (https_sock >= 0) { |
| 2692 | FD_SET(https_sock, &fds); |
| 2693 | } |
| 2694 | if (https_sock6 >= 0) { |
| 2695 | FD_SET(https_sock6, &fds); |
| 2696 | if (https_sock6 > https_sock) { |
| 2697 | nmax = https_sock6; |
| 2698 | } |
| 2699 | } |
| 2700 | |
| 2701 | tv.tv_sec = 0; |
| 2702 | tv.tv_usec = 0; |
| 2703 | |
| 2704 | nfds = select(nmax+1, &fds, NULL, NULL, &tv); |
| 2705 | |
| 2706 | if (nfds <= 0) { |
| 2707 | return; |
| 2708 | } |
| 2709 | |
| 2710 | if (https_sock >= 0 && FD_ISSET(https_sock, &fds)) { |
| 2711 | rfbLog("SSL: accept_openssl(OPENSSL_HTTPS)\n"); |
| 2712 | accept_openssl(OPENSSL_HTTPS, -1); |
| 2713 | } |
| 2714 | if (https_sock6 >= 0 && FD_ISSET(https_sock6, &fds)) { |
| 2715 | rfbLog("SSL: accept_openssl(OPENSSL_HTTPS6)\n"); |
| 2716 | accept_openssl(OPENSSL_HTTPS6, -1); |
| 2717 | } |
| 2718 | } |
| 2719 | |
| 2720 | void openssl_port(int restart) { |
| 2721 | int sock = -1, shutdown = 0; |
| 2722 | static int port = -1; |
| 2723 | static in_addr_t iface = INADDR_ANY; |
| 2724 | int db = 0, fd6 = -1; |
| 2725 | |
| 2726 | if (! screen) { |
| 2727 | rfbLog("openssl_port: no screen!\n"); |
| 2728 | clean_up_exit(1); |
| 2729 | } |
| 2730 | if (inetd) { |
| 2731 | ssl_initialized = 1; |
| 2732 | return; |
| 2733 | } |
| 2734 | |
| 2735 | if (ipv6_listen && screen->port <= 0) { |
| 2736 | if (got_rfbport) { |
| 2737 | screen->port = got_rfbport_val; |
| 2738 | } else { |
| 2739 | int ap = 5900; |
| 2740 | if (auto_port > 0) { |
| 2741 | ap = auto_port; |
| 2742 | } |
| 2743 | screen->port = find_free_port6(ap, ap+200); |
| 2744 | } |
| 2745 | rfbLog("openssl_port: reset port from 0 => %d\n", screen->port); |
| 2746 | } |
| 2747 | |
| 2748 | if (restart) { |
| 2749 | port = screen->port; |
| 2750 | } else if (screen->listenSock > -1 && screen->port > 0) { |
| 2751 | port = screen->port; |
| 2752 | shutdown = 1; |
| 2753 | } else if (ipv6_listen && screen->port > 0) { |
| 2754 | port = screen->port; |
| 2755 | } else if (screen->port == 0) { |
| 2756 | port = screen->port; |
| 2757 | } |
| 2758 | |
| 2759 | iface = screen->listenInterface; |
| 2760 | |
| 2761 | if (shutdown) { |
| 2762 | if (db) fprintf(stderr, "shutting down %d/%d\n", |
| 2763 | port, screen->listenSock); |
| 2764 | #if LIBVNCSERVER_HAS_SHUTDOWNSOCKETS |
| 2765 | rfbShutdownSockets(screen); |
| 2766 | #endif |
| 2767 | } |
| 2768 | |
| 2769 | if (openssl_sock >= 0) { |
| 2770 | close(openssl_sock); |
| 2771 | openssl_sock = -1; |
| 2772 | } |
| 2773 | if (openssl_sock6 >= 0) { |
| 2774 | close(openssl_sock6); |
| 2775 | openssl_sock6 = -1; |
| 2776 | } |
| 2777 | |
| 2778 | if (port < 0) { |
| 2779 | rfbLog("openssl_port: could not obtain listening port %d\n", port); |
| 2780 | if (!got_rfbport && !got_ipv6_listen) { |
| 2781 | rfbLog("openssl_port: if this system is IPv6-only, use the -6 option\n"); |
| 2782 | } |
| 2783 | clean_up_exit(1); |
| 2784 | } else if (port == 0) { |
| 2785 | /* no listen case, i.e. -connect */ |
| 2786 | sock = -1; |
| 2787 | } else { |
| 2788 | sock = listen_tcp(port, iface, 0); |
| 2789 | if (ipv6_listen) { |
| 2790 | fd6 = listen6(port); |
| 2791 | } else if (!got_rfbport && !got_ipv6_listen) { |
| 2792 | if (sock < 0) { |
| 2793 | rfbLog("openssl_port: if this system is IPv6-only, use the -6 option\n"); |
| 2794 | } |
| 2795 | } |
| 2796 | if (sock < 0) { |
| 2797 | if (fd6 < 0) { |
| 2798 | rfbLog("openssl_port: could not reopen port %d\n", port); |
| 2799 | if (!restart) { |
| 2800 | clean_up_exit(1); |
| 2801 | } |
| 2802 | } else { |
| 2803 | rfbLog("openssl_port: Info: listening on IPv6 only.\n"); |
| 2804 | } |
| 2805 | } |
| 2806 | } |
| 2807 | rfbLog("openssl_port: listen on port/sock %d/%d\n", port, sock); |
| 2808 | if (ipv6_listen && port > 0) { |
| 2809 | if (fd6 < 0) { |
| 2810 | fd6 = listen6(port); |
| 2811 | } |
| 2812 | if (fd6 < 0) { |
| 2813 | ipv6_listen = 0; |
| 2814 | } else { |
| 2815 | rfbLog("openssl_port: listen on port/sock %d/%d (ipv6)\n", |
| 2816 | port, fd6); |
| 2817 | openssl_sock6 = fd6; |
| 2818 | } |
| 2819 | } |
| 2820 | if (!quiet && sock >=0) { |
| 2821 | announce(port, 1, NULL); |
| 2822 | } |
| 2823 | openssl_sock = sock; |
| 2824 | openssl_port_num = port; |
| 2825 | |
| 2826 | ssl_initialized = 1; |
| 2827 | } |
| 2828 | |
| 2829 | void https_port(int restart) { |
| 2830 | int sock, fd6 = -1; |
| 2831 | static int port = 0; |
| 2832 | static in_addr_t iface = INADDR_ANY; |
| 2833 | |
| 2834 | /* as openssl_port above: open a listening socket for pure https: */ |
| 2835 | if (https_port_num < 0) { |
| 2836 | return; |
| 2837 | } |
| 2838 | if (! screen) { |
| 2839 | rfbLog("https_port: no screen!\n"); |
| 2840 | clean_up_exit(1); |
| 2841 | } |
| 2842 | if (! screen->httpDir) { |
| 2843 | return; |
| 2844 | } |
| 2845 | if (screen->listenInterface) { |
| 2846 | iface = screen->listenInterface; |
| 2847 | } |
| 2848 | |
| 2849 | if (https_port_num == 0) { |
| 2850 | https_port_num = find_free_port(5801, 5851); |
| 2851 | } |
| 2852 | if (ipv6_listen && https_port_num <= 0) { |
| 2853 | https_port_num = find_free_port6(5801, 5851); |
| 2854 | } |
| 2855 | if (https_port_num <= 0) { |
| 2856 | rfbLog("https_port: could not find port %d\n", https_port_num); |
| 2857 | clean_up_exit(1); |
| 2858 | } |
| 2859 | port = https_port_num; |
| 2860 | |
| 2861 | if (port <= 0) { |
| 2862 | rfbLog("https_port: could not obtain listening port %d\n", port); |
| 2863 | if (!restart) { |
| 2864 | clean_up_exit(1); |
| 2865 | } else { |
| 2866 | return; |
| 2867 | } |
| 2868 | } |
| 2869 | if (https_sock >= 0) { |
| 2870 | close(https_sock); |
| 2871 | https_sock = -1; |
| 2872 | } |
| 2873 | if (https_sock6 >= 0) { |
| 2874 | close(https_sock6); |
| 2875 | https_sock6 = -1; |
| 2876 | } |
| 2877 | sock = listen_tcp(port, iface, 0); |
| 2878 | if (sock < 0) { |
| 2879 | rfbLog("https_port: could not open port %d\n", port); |
| 2880 | if (ipv6_listen) { |
| 2881 | fd6 = listen6(port); |
| 2882 | } |
| 2883 | if (fd6 < 0) { |
| 2884 | if (!restart) { |
| 2885 | clean_up_exit(1); |
| 2886 | } |
| 2887 | } |
| 2888 | rfbLog("https_port: trying IPv6 only mode.\n"); |
| 2889 | } |
| 2890 | rfbLog("https_port: listen on port/sock %d/%d\n", port, sock); |
| 2891 | https_sock = sock; |
| 2892 | |
| 2893 | if (ipv6_listen) { |
| 2894 | if (fd6 < 0) { |
| 2895 | fd6 = listen6(port); |
| 2896 | } |
| 2897 | if (fd6 < 0) { |
| 2898 | ; |
| 2899 | } else { |
| 2900 | rfbLog("https_port: listen on port/sock %d/%d (ipv6)\n", |
| 2901 | port, fd6); |
| 2902 | https_sock6 = fd6; |
| 2903 | } |
| 2904 | if (fd6 < 0 && https_sock < 0) { |
| 2905 | rfbLog("https_port: could not listen on either IPv4 or IPv6.\n"); |
| 2906 | if (!restart) { |
| 2907 | clean_up_exit(1); |
| 2908 | } |
| 2909 | } |
| 2910 | } |
| 2911 | } |
| 2912 | |
| 2913 | static void lose_ram(void) { |
| 2914 | /* |
| 2915 | * for a forked child that will be around for a long time |
| 2916 | * without doing exec(). we really should re-exec, but a pain |
| 2917 | * to redo all SSL ctx. |
| 2918 | */ |
| 2919 | free_old_fb(); |
| 2920 | |
| 2921 | free_tiles(); |
| 2922 | } |
| 2923 | |
| 2924 | /* utility to keep track of existing helper processes: */ |
| 2925 | |
| 2926 | void ssl_helper_pid(pid_t pid, int sock) { |
| 2927 | # define HPSIZE 256 |
| 2928 | static pid_t helpers[HPSIZE]; |
| 2929 | static int sockets[HPSIZE], first = 1; |
| 2930 | int i, empty, set, status; |
| 2931 | static int db = 0; |
| 2932 | |
| 2933 | if (first) { |
| 2934 | for (i=0; i < HPSIZE; i++) { |
| 2935 | helpers[i] = 0; |
| 2936 | sockets[i] = 0; |
| 2937 | } |
| 2938 | if (getenv("SSL_HELPER_PID_DB")) { |
| 2939 | db = 1; |
| 2940 | } |
| 2941 | first = 0; |
| 2942 | } |
| 2943 | |
| 2944 | |
| 2945 | if (pid == 0) { |
| 2946 | /* killall or waitall */ |
| 2947 | for (i=0; i < HPSIZE; i++) { |
| 2948 | if (helpers[i] == 0) { |
| 2949 | sockets[i] = -1; |
| 2950 | continue; |
| 2951 | } |
| 2952 | if (kill(helpers[i], 0) == 0) { |
| 2953 | int kret = -2; |
| 2954 | pid_t wret; |
| 2955 | if (sock != -2) { |
| 2956 | if (sockets[i] >= 0) { |
| 2957 | close(sockets[i]); |
| 2958 | } |
| 2959 | kret = kill(helpers[i], SIGTERM); |
| 2960 | if (kret == 0) { |
| 2961 | usleep(20 * 1000); |
| 2962 | } |
| 2963 | } |
| 2964 | |
| 2965 | #if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID |
| 2966 | wret = waitpid(helpers[i], &status, WNOHANG); |
| 2967 | |
| 2968 | if (db) fprintf(stderr, "waitpid(%d)\n", helpers[i]); |
| 2969 | if (db) fprintf(stderr, " waitret1=%d\n", wret); |
| 2970 | |
| 2971 | if (kret == 0 && wret != helpers[i]) { |
| 2972 | int k; |
| 2973 | for (k=0; k < 10; k++) { |
| 2974 | usleep(100 * 1000); |
| 2975 | wret = waitpid(helpers[i], &status, WNOHANG); |
| 2976 | if (db) fprintf(stderr, " waitret2=%d\n", wret); |
| 2977 | if (wret == helpers[i]) { |
| 2978 | break; |
| 2979 | } |
| 2980 | } |
| 2981 | } |
| 2982 | #endif |
| 2983 | if (sock == -2) { |
| 2984 | continue; |
| 2985 | } |
| 2986 | } |
| 2987 | helpers[i] = 0; |
| 2988 | sockets[i] = -1; |
| 2989 | } |
| 2990 | return; |
| 2991 | } |
| 2992 | |
| 2993 | if (db) fprintf(stderr, "ssl_helper_pid(%d, %d)\n", pid, sock); |
| 2994 | |
| 2995 | /* add (or delete for sock == -1) */ |
| 2996 | set = 0; |
| 2997 | empty = -1; |
| 2998 | for (i=0; i < HPSIZE; i++) { |
| 2999 | if (helpers[i] == pid) { |
| 3000 | if (sock == -1) { |
| 3001 | #if LIBVNCSERVER_HAVE_SYS_WAIT_H && LIBVNCSERVER_HAVE_WAITPID |
| 3002 | pid_t wret; |
| 3003 | wret = waitpid(helpers[i], &status, WNOHANG); |
| 3004 | |
| 3005 | if (db) fprintf(stderr, "waitpid(%d) 2\n", helpers[i]); |
| 3006 | if (db) fprintf(stderr, " waitret1=%d\n", wret); |
| 3007 | #endif |
| 3008 | helpers[i] = 0; |
| 3009 | } |
| 3010 | sockets[i] = sock; |
| 3011 | set = 1; |
| 3012 | } else if (empty == -1 && helpers[i] == 0) { |
| 3013 | empty = i; |
| 3014 | } |
| 3015 | } |
| 3016 | if (set || sock == -1) { |
| 3017 | return; /* done */ |
| 3018 | } |
| 3019 | |
| 3020 | /* now try to store */ |
| 3021 | if (empty >= 0) { |
| 3022 | helpers[empty] = pid; |
| 3023 | sockets[empty] = sock; |
| 3024 | return; |
| 3025 | } |
| 3026 | for (i=0; i < HPSIZE; i++) { |
| 3027 | if (helpers[i] == 0) { |
| 3028 | continue; |
| 3029 | } |
| 3030 | /* clear out stale pids: */ |
| 3031 | if (kill(helpers[i], 0) != 0) { |
| 3032 | helpers[i] = 0; |
| 3033 | sockets[i] = -1; |
| 3034 | |
| 3035 | if (empty == -1) { |
| 3036 | empty = i; |
| 3037 | } |
| 3038 | } |
| 3039 | } |
| 3040 | if (empty >= 0) { |
| 3041 | helpers[empty] = pid; |
| 3042 | sockets[empty] = sock; |
| 3043 | } |
| 3044 | } |
| 3045 | |
| 3046 | static int is_ssl_readable(int s_in, double last_https, char *last_get, |
| 3047 | int mode) { |
| 3048 | int nfd, db = 0; |
| 3049 | struct timeval tv; |
| 3050 | fd_set rd; |
| 3051 | |
| 3052 | if (getenv("ACCEPT_OPENSSL_DEBUG")) { |
| 3053 | db = atoi(getenv("ACCEPT_OPENSSL_DEBUG")); |
| 3054 | } |
| 3055 | |
| 3056 | /* |
| 3057 | * we'll do a select() on s_in for reading. this is not an |
| 3058 | * absolute proof that SSL_read is ready (XXX use SSL utility). |
| 3059 | */ |
| 3060 | tv.tv_sec = 2; |
| 3061 | tv.tv_usec = 0; |
| 3062 | |
| 3063 | if (mode == OPENSSL_INETD) { |
| 3064 | /* |
| 3065 | * https via inetd is icky because x11vnc is restarted |
| 3066 | * for each socket (and some clients send requests |
| 3067 | * rapid fire). |
| 3068 | */ |
| 3069 | tv.tv_sec = 4; |
| 3070 | } |
| 3071 | |
| 3072 | /* |
| 3073 | * increase the timeout if we know HTTP traffic has occurred |
| 3074 | * recently: |
| 3075 | */ |
| 3076 | if (dnow() < last_https + 30.0) { |
| 3077 | tv.tv_sec = 10; |
| 3078 | if (last_get && strstr(last_get, "VncViewer")) { |
| 3079 | tv.tv_sec = 5; |
| 3080 | } |
| 3081 | } |
| 3082 | if (getenv("X11VNC_HTTPS_VS_VNC_TIMEOUT")) { |
| 3083 | tv.tv_sec = atoi(getenv("X11VNC_HTTPS_VS_VNC_TIMEOUT")); |
| 3084 | } |
| 3085 | if (db) fprintf(stderr, "tv_sec: %d - '%s'\n", (int) tv.tv_sec, last_get); |
| 3086 | |
| 3087 | FD_ZERO(&rd); |
| 3088 | FD_SET(s_in, &rd); |
| 3089 | |
| 3090 | if (db) fprintf(stderr, "is_ssl_readable: begin select(%d secs) %.6f\n", (int) tv.tv_sec, dnow()); |
| 3091 | do { |
| 3092 | nfd = select(s_in+1, &rd, NULL, NULL, &tv); |
| 3093 | } while (nfd < 0 && errno == EINTR); |
| 3094 | if (db) fprintf(stderr, "is_ssl_readable: finish select(%d secs) %.6f\n", (int) tv.tv_sec, dnow()); |
| 3095 | |
| 3096 | if (db) fprintf(stderr, "https nfd: %d\n", nfd); |
| 3097 | |
| 3098 | if (nfd <= 0 || ! FD_ISSET(s_in, &rd)) { |
| 3099 | return 0; |
| 3100 | } |
| 3101 | return 1; |
| 3102 | } |
| 3103 | |
| 3104 | static int watch_for_http_traffic(char *buf_a, int *n_a, int raw_sock) { |
| 3105 | int is_http, err, n, n2; |
| 3106 | char *buf; |
| 3107 | int db = 0; |
| 3108 | /* |
| 3109 | * sniff the first couple bytes of the stream and try to see |
| 3110 | * if it is http or not. if we read them OK, we must read the |
| 3111 | * rest of the available data otherwise we may deadlock. |
| 3112 | * what has been read is returned in buf_a and n_a. |
| 3113 | * *buf_a is ABSIZE+1 long and zeroed. |
| 3114 | */ |
| 3115 | if (getenv("ACCEPT_OPENSSL_DEBUG")) { |
| 3116 | db = atoi(getenv("ACCEPT_OPENSSL_DEBUG")); |
| 3117 | } |
| 3118 | if (! buf_a || ! n_a) { |
| 3119 | return 0; |
| 3120 | } |
| 3121 | |
| 3122 | buf = (char *) calloc((ABSIZE+1), 1); |
| 3123 | *n_a = 0; |
| 3124 | |
| 3125 | if (enc_str && !strcmp(enc_str, "none")) { |
| 3126 | n = read(raw_sock, buf, 2); |
| 3127 | err = SSL_ERROR_NONE; |
| 3128 | } else { |
| 3129 | #if LIBVNCSERVER_HAVE_LIBSSL |
| 3130 | n = SSL_read(ssl, buf, 2); |
| 3131 | err = SSL_get_error(ssl, n); |
| 3132 | #else |
| 3133 | err = n = 0; |
| 3134 | badnews("1 in watch_for_http_traffic"); |
| 3135 | #endif |
| 3136 | } |
| 3137 | |
| 3138 | if (err != SSL_ERROR_NONE || n < 2) { |
| 3139 | if (n > 0) { |
| 3140 | strncpy(buf_a, buf, n); |
| 3141 | *n_a = n; |
| 3142 | } |
| 3143 | if (db) fprintf(stderr, "watch_for_http_traffic ssl err: %d/%d\n", err, n); |
| 3144 | return -1; |
| 3145 | } |
| 3146 | |
| 3147 | /* look for GET, HEAD, POST, CONNECT */ |
| 3148 | is_http = 0; |
| 3149 | if (!strncmp("GE", buf, 2)) { |
| 3150 | is_http = 1; |
| 3151 | } else if (!strncmp("HE", buf, 2)) { |
| 3152 | is_http = 1; |
| 3153 | } else if (!strncmp("PO", buf, 2)) { |
| 3154 | is_http = 1; |
| 3155 | } else if (!strncmp("CO", buf, 2)) { |
| 3156 | is_http = 1; |
| 3157 | } |
| 3158 | if (db) fprintf(stderr, "watch_for_http_traffic read: '%s' %d\n", buf, n); |
| 3159 | |
| 3160 | /* |
| 3161 | * better read all we can and fwd it along to avoid blocking |
| 3162 | * in ssl_xfer(). |
| 3163 | */ |
| 3164 | |
| 3165 | if (enc_str && !strcmp(enc_str, "none")) { |
| 3166 | n2 = read(raw_sock, buf + n, ABSIZE - n); |
| 3167 | } else { |
| 3168 | #if LIBVNCSERVER_HAVE_LIBSSL |
| 3169 | n2 = SSL_read(ssl, buf + n, ABSIZE - n); |
| 3170 | #else |
| 3171 | n2 = 0; |
| 3172 | badnews("2 in watch_for_http_traffic"); |
| 3173 | #endif |
| 3174 | } |
| 3175 | if (n2 >= 0) { |
| 3176 | n += n2; |
| 3177 | } |
| 3178 | |
| 3179 | *n_a = n; |
| 3180 | |
| 3181 | if (db) fprintf(stderr, "watch_for_http_traffic readmore: %d\n", n2); |
| 3182 | |
| 3183 | if (n > 0) { |
| 3184 | memcpy(buf_a, buf, n); |
| 3185 | } |
| 3186 | if (db > 1) { |
| 3187 | fprintf(stderr, "watch_for_http_traffic readmore: "); |
| 3188 | write(2, buf_a, *n_a); |
| 3189 | fprintf(stderr, "\n"); |
| 3190 | } |
| 3191 | if (db) fprintf(stderr, "watch_for_http_traffic return: %d\n", is_http); |
| 3192 | return is_http; |
| 3193 | } |
| 3194 | |
| 3195 | static int csock_timeout_sock = -1; |
| 3196 | |
| 3197 | static void csock_timeout (int sig) { |
| 3198 | rfbLog("sig: %d, csock_timeout.\n", sig); |
| 3199 | if (csock_timeout_sock >= 0) { |
| 3200 | close(csock_timeout_sock); |
| 3201 | csock_timeout_sock = -1; |
| 3202 | } |
| 3203 | } |
| 3204 | |
| 3205 | static int check_ssl_access(char *addr) { |
| 3206 | static char *save_allow_once = NULL; |
| 3207 | static time_t time_allow_once = 0; |
| 3208 | |
| 3209 | /* due to "Fetch Cert" activities for SSL really need to "allow twice" */ |
| 3210 | if (allow_once != NULL) { |
| 3211 | save_allow_once = strdup(allow_once); |
| 3212 | time_allow_once = time(NULL); |
| 3213 | } else if (save_allow_once != NULL) { |
| 3214 | if (getenv("X11VNC_NO_SSL_ALLOW_TWICE")) { |
| 3215 | ; |
| 3216 | } else if (time(NULL) < time_allow_once + 30) { |
| 3217 | /* give them 30 secs to check and save the fetched cert. */ |
| 3218 | allow_once = save_allow_once; |
| 3219 | rfbLog("SSL: Permitting 30 sec grace period for allowonce.\n"); |
| 3220 | rfbLog("SSL: Set X11VNC_NO_SSL_ALLOW_TWICE=1 to disable.\n"); |
| 3221 | } |
| 3222 | save_allow_once = NULL; |
| 3223 | time_allow_once = 0; |
| 3224 | } |
| 3225 | |
| 3226 | return check_access(addr); |
| 3227 | } |
| 3228 | |
| 3229 | void accept_openssl(int mode, int presock) { |
| 3230 | int sock = -1, listen = -1, cport, csock, vsock; |
| 3231 | int peerport = 0; |
| 3232 | int status, n, i, db = 0; |
| 3233 | struct sockaddr_in addr; |
| 3234 | #ifdef __hpux |
| 3235 | int addrlen = sizeof(addr); |
| 3236 | #else |
| 3237 | socklen_t addrlen = sizeof(addr); |
| 3238 | #endif |
| 3239 | rfbClientPtr client; |
| 3240 | pid_t pid; |
| 3241 | char uniq[] = "_evilrats_"; |
| 3242 | char cookie[256], rcookie[256], *name = NULL; |
| 3243 | int vencrypt_sel = 0; |
| 3244 | int anontls_sel = 0; |
| 3245 | char *ipv6_name = NULL; |
| 3246 | static double last_https = 0.0; |
| 3247 | static char last_get[256]; |
| 3248 | static int first = 1; |
| 3249 | unsigned char *rb; |
| 3250 | |
| 3251 | #if !LIBVNCSERVER_HAVE_LIBSSL |
| 3252 | if (enc_str == NULL || strcmp(enc_str, "none")) { |
| 3253 | badnews("0 accept_openssl"); |
| 3254 | } |
| 3255 | #endif |
| 3256 | |
| 3257 | openssl_last_helper_pid = 0; |
| 3258 | |
| 3259 | /* zero buffers for use below. */ |
| 3260 | for (i=0; i<256; i++) { |
| 3261 | if (first) { |
| 3262 | last_get[i] = '\0'; |
| 3263 | } |
| 3264 | cookie[i] = '\0'; |
| 3265 | rcookie[i] = '\0'; |
| 3266 | } |
| 3267 | first = 0; |
| 3268 | |
| 3269 | if (getenv("ACCEPT_OPENSSL_DEBUG")) { |
| 3270 | db = atoi(getenv("ACCEPT_OPENSSL_DEBUG")); |
| 3271 | } |
| 3272 | |
| 3273 | /* do INETD, VNC, or HTTPS cases (result is client socket or pipe) */ |
| 3274 | if (mode == OPENSSL_INETD) { |
| 3275 | ssl_initialized = 1; |
| 3276 | |
| 3277 | } else if (mode == OPENSSL_VNC) { |
| 3278 | sock = accept(openssl_sock, (struct sockaddr *)&addr, &addrlen); |
| 3279 | if (sock < 0) { |
| 3280 | rfbLog("SSL: accept_openssl: accept connection failed\n"); |
| 3281 | rfbLogPerror("accept"); |
| 3282 | if (ssl_no_fail) { |
| 3283 | clean_up_exit(1); |
| 3284 | } |
| 3285 | return; |
| 3286 | } |
| 3287 | listen = openssl_sock; |
| 3288 | |
| 3289 | } else if (mode == OPENSSL_VNC6 || mode == OPENSSL_HTTPS6) { |
| 3290 | #if X11VNC_IPV6 |
| 3291 | struct sockaddr_in6 a6; |
| 3292 | socklen_t a6len = sizeof(a6); |
| 3293 | int fd = (mode == OPENSSL_VNC6 ? openssl_sock6 : https_sock6); |
| 3294 | |
| 3295 | sock = accept(fd, (struct sockaddr *)&a6, &a6len); |
| 3296 | if (sock < 0) { |
| 3297 | rfbLog("SSL: accept_openssl: accept connection failed\n"); |
| 3298 | rfbLogPerror("accept"); |
| 3299 | if (ssl_no_fail) { |
| 3300 | clean_up_exit(1); |
| 3301 | } |
| 3302 | return; |
| 3303 | } |
| 3304 | ipv6_name = ipv6_getipaddr((struct sockaddr *)&a6, a6len); |
| 3305 | if (!ipv6_name) ipv6_name = strdup("unknown"); |
| 3306 | listen = fd; |
| 3307 | #endif |
| 3308 | } else if (mode == OPENSSL_REVERSE) { |
| 3309 | sock = presock; |
| 3310 | if (sock < 0) { |
| 3311 | rfbLog("SSL: accept_openssl: connection failed\n"); |
| 3312 | if (ssl_no_fail) { |
| 3313 | clean_up_exit(1); |
| 3314 | } |
| 3315 | return; |
| 3316 | } |
| 3317 | if (getenv("OPENSSL_REVERSE_DEBUG")) fprintf(stderr, "OPENSSL_REVERSE: ipv6_client_ip_str: %s\n", ipv6_client_ip_str); |
| 3318 | if (ipv6_client_ip_str != NULL) { |
| 3319 | ipv6_name = strdup(ipv6_client_ip_str); |
| 3320 | } |
| 3321 | listen = -1; |
| 3322 | |
| 3323 | } else if (mode == OPENSSL_HTTPS) { |
| 3324 | sock = accept(https_sock, (struct sockaddr *)&addr, &addrlen); |
| 3325 | if (sock < 0) { |
| 3326 | rfbLog("SSL: accept_openssl: accept connection failed\n"); |
| 3327 | rfbLogPerror("accept"); |
| 3328 | if (ssl_no_fail) { |
| 3329 | clean_up_exit(1); |
| 3330 | } |
| 3331 | return; |
| 3332 | } |
| 3333 | listen = https_sock; |
| 3334 | } |
| 3335 | if (db) fprintf(stderr, "SSL: accept_openssl: sock: %d\n", sock); |
| 3336 | |
| 3337 | if (openssl_last_ip) { |
| 3338 | free(openssl_last_ip); |
| 3339 | openssl_last_ip = NULL; |
| 3340 | } |
| 3341 | if (mode == OPENSSL_INETD) { |
| 3342 | openssl_last_ip = get_remote_host(fileno(stdin)); |
| 3343 | } else if (mode == OPENSSL_VNC6 || mode == OPENSSL_HTTPS6) { |
| 3344 | openssl_last_ip = ipv6_name; |
| 3345 | } else if (mode == OPENSSL_REVERSE && ipv6_name != NULL) { |
| 3346 | openssl_last_ip = ipv6_name; |
| 3347 | } else { |
| 3348 | openssl_last_ip = get_remote_host(sock); |
| 3349 | } |
| 3350 | |
| 3351 | if (!check_ssl_access(openssl_last_ip)) { |
| 3352 | rfbLog("SSL: accept_openssl: denying client %s\n", openssl_last_ip); |
| 3353 | rfbLog("SSL: accept_openssl: does not match -allow or other reason.\n"); |
| 3354 | close(sock); |
| 3355 | sock = -1; |
| 3356 | if (ssl_no_fail) { |
| 3357 | clean_up_exit(1); |
| 3358 | } |
| 3359 | return; |
| 3360 | } |
| 3361 | |
| 3362 | /* now make a listening socket for child to connect back to us by: */ |
| 3363 | |
| 3364 | cport = find_free_port(20000, 22000); |
| 3365 | if (! cport && ipv6_listen) { |
| 3366 | rfbLog("SSL: accept_openssl: seeking IPv6 port.\n"); |
| 3367 | cport = find_free_port6(20000, 22000); |
| 3368 | rfbLog("SSL: accept_openssl: IPv6 port: %d\n", cport); |
| 3369 | } |
| 3370 | if (! cport) { |
| 3371 | rfbLog("SSL: accept_openssl: could not find open port.\n"); |
| 3372 | close(sock); |
| 3373 | if (mode == OPENSSL_INETD || ssl_no_fail) { |
| 3374 | clean_up_exit(1); |
| 3375 | } |
| 3376 | return; |
| 3377 | } |
| 3378 | if (db) fprintf(stderr, "accept_openssl: cport: %d\n", cport); |
| 3379 | |
| 3380 | csock = listen_tcp(cport, htonl(INADDR_LOOPBACK), 1); |
| 3381 | |
| 3382 | if (csock < 0) { |
| 3383 | rfbLog("SSL: accept_openssl: could not listen on port %d.\n", |
| 3384 | cport); |
| 3385 | close(sock); |
| 3386 | if (mode == OPENSSL_INETD || ssl_no_fail) { |
| 3387 | clean_up_exit(1); |
| 3388 | } |
| 3389 | return; |
| 3390 | } |
| 3391 | if (db) fprintf(stderr, "accept_openssl: csock: %d\n", csock); |
| 3392 | |
| 3393 | fflush(stderr); |
| 3394 | |
| 3395 | /* |
| 3396 | * make a simple cookie to id the child socket, not foolproof |
| 3397 | * but hard to guess exactly (just worrying about local lusers |
| 3398 | * here, since we use INADDR_LOOPBACK). |
| 3399 | */ |
| 3400 | rb = (unsigned char *) calloc(6, 1); |
| 3401 | #if LIBVNCSERVER_HAVE_LIBSSL |
| 3402 | RAND_bytes(rb, 6); |
| 3403 | #endif |
| 3404 | sprintf(cookie, "RB=%d%d%d%d%d%d/%f%f/%p", |
| 3405 | rb[0], rb[1], rb[2], rb[3], rb[4], rb[5], |
| 3406 | dnow() - x11vnc_start, x11vnc_start, (void *)rb); |
| 3407 | |
| 3408 | if (mode == OPENSSL_VNC6) { |
| 3409 | name = strdup(ipv6_name); |
| 3410 | peerport = get_remote_port(sock); |
| 3411 | } else if (mode == OPENSSL_REVERSE && ipv6_name != NULL) { |
| 3412 | name = strdup(ipv6_name); |
| 3413 | peerport = get_remote_port(sock); |
| 3414 | } else if (mode != OPENSSL_INETD) { |
| 3415 | name = get_remote_host(sock); |
| 3416 | peerport = get_remote_port(sock); |
| 3417 | } else { |
| 3418 | openssl_last_ip = get_remote_host(fileno(stdin)); |
| 3419 | peerport = get_remote_port(fileno(stdin)); |
| 3420 | if (openssl_last_ip) { |
| 3421 | name = strdup(openssl_last_ip); |
| 3422 | } else { |
| 3423 | name = strdup("unknown"); |
| 3424 | } |
| 3425 | } |
| 3426 | if (name) { |
| 3427 | if (mode == OPENSSL_INETD) { |
| 3428 | rfbLog("SSL: (inetd) spawning helper process " |
| 3429 | "to handle: %s:%d\n", name, peerport); |
| 3430 | } else { |
| 3431 | rfbLog("SSL: spawning helper process to handle: " |
| 3432 | "%s:%d\n", name, peerport); |
| 3433 | } |
| 3434 | free(name); |
| 3435 | name = NULL; |
| 3436 | } |
| 3437 | |
| 3438 | if (certret) { |
| 3439 | free(certret); |
| 3440 | } |
| 3441 | if (certret_str) { |
| 3442 | free(certret_str); |
| 3443 | certret_str = NULL; |
| 3444 | } |
| 3445 | certret = strdup("/tmp/x11vnc-certret.XXXXXX"); |
| 3446 | omode = umask(077); |
| 3447 | certret_fd = mkstemp(certret); |
| 3448 | umask(omode); |
| 3449 | if (certret_fd < 0) { |
| 3450 | free(certret); |
| 3451 | certret = NULL; |
| 3452 | certret_fd = -1; |
| 3453 | } |
| 3454 | |
| 3455 | if (dhret) { |
| 3456 | free(dhret); |
| 3457 | } |
| 3458 | if (dhret_str) { |
| 3459 | free(dhret_str); |
| 3460 | dhret_str = NULL; |
| 3461 | } |
| 3462 | dhret = strdup("/tmp/x11vnc-dhret.XXXXXX"); |
| 3463 | omode = umask(077); |
| 3464 | dhret_fd = mkstemp(dhret); |
| 3465 | umask(omode); |
| 3466 | if (dhret_fd < 0) { |
| 3467 | free(dhret); |
| 3468 | dhret = NULL; |
| 3469 | dhret_fd = -1; |
| 3470 | } |
| 3471 | |
| 3472 | /* now fork the child to handle the SSL: */ |
| 3473 | pid = fork(); |
| 3474 | |
| 3475 | if (pid > 0) { |
| 3476 | rfbLog("SSL: helper for peerport %d is pid %d: \n", |
| 3477 | peerport, (int) pid); |
| 3478 | } |
| 3479 | |
| 3480 | if (pid < 0) { |
| 3481 | rfbLog("SSL: accept_openssl: could not fork.\n"); |
| 3482 | rfbLogPerror("fork"); |
| 3483 | close(sock); |
| 3484 | close(csock); |
| 3485 | if (mode == OPENSSL_INETD || ssl_no_fail) { |
| 3486 | clean_up_exit(1); |
| 3487 | } |
| 3488 | return; |
| 3489 | |
| 3490 | } else if (pid == 0) { |
| 3491 | int s_in, s_out, httpsock = -1; |
| 3492 | int vncsock; |
| 3493 | int i, have_httpd = 0; |
| 3494 | int f_in = fileno(stdin); |
| 3495 | int f_out = fileno(stdout); |
| 3496 | int skip_vnc_tls = mode == OPENSSL_HTTPS ? 1 : 0; |
| 3497 | |
| 3498 | if (db) fprintf(stderr, "helper pid in: %d %d %d %d\n", f_in, f_out, sock, listen); |
| 3499 | |
| 3500 | /* reset all handlers to default (no interrupted() calls) */ |
| 3501 | unset_signals(); |
| 3502 | |
| 3503 | /* close all non-essential fd's */ |
| 3504 | for (i=0; i<256; i++) { |
| 3505 | if (mode == OPENSSL_INETD) { |
| 3506 | if (i == f_in || i == f_out) { |
| 3507 | continue; |
| 3508 | } |
| 3509 | } |
| 3510 | if (i == sock) { |
| 3511 | continue; |
| 3512 | } |
| 3513 | if (i == 2) { |
| 3514 | continue; |
| 3515 | } |
| 3516 | close(i); |
| 3517 | } |
| 3518 | |
| 3519 | /* |
| 3520 | * sadly, we are a long lived child and so the large |
| 3521 | * framebuffer memory areas will soon differ from parent. |
| 3522 | * try to free as much as possible. |
| 3523 | */ |
| 3524 | lose_ram(); |
| 3525 | |
| 3526 | /* now connect back to parent socket: */ |
| 3527 | vncsock = connect_tcp("127.0.0.1", cport); |
| 3528 | if (vncsock < 0) { |
| 3529 | rfbLog("SSL: ssl_helper[%d]: could not connect" |
| 3530 | " back to: %d\n", getpid(), cport); |
| 3531 | rfbLog("SSL: ssl_helper[%d]: exit case 1 (no local vncsock)\n", getpid()); |
| 3532 | exit(1); |
| 3533 | } |
| 3534 | if (db) fprintf(stderr, "vncsock %d\n", vncsock); |
| 3535 | |
| 3536 | /* try to initialize SSL with the remote client */ |
| 3537 | |
| 3538 | if (mode == OPENSSL_INETD) { |
| 3539 | s_in = fileno(stdin); |
| 3540 | s_out = fileno(stdout); |
| 3541 | } else { |
| 3542 | s_in = s_out = sock; |
| 3543 | } |
| 3544 | |
| 3545 | if (! ssl_init(s_in, s_out, skip_vnc_tls, last_https)) { |
| 3546 | close(vncsock); |
| 3547 | rfbLog("SSL: ssl_helper[%d]: exit case 2 (ssl_init failed)\n", getpid()); |
| 3548 | exit(1); |
| 3549 | } |
| 3550 | |
| 3551 | if (vencrypt_selected != 0) { |
| 3552 | char *tbuf; |
| 3553 | tbuf = (char *) malloc(strlen(cookie) + 100); |
| 3554 | sprintf(tbuf, "%s,VENCRYPT=%d,%s", uniq, vencrypt_selected, cookie); |
| 3555 | write(vncsock, tbuf, strlen(cookie)); |
| 3556 | goto wrote_cookie; |
| 3557 | } else if (anontls_selected != 0) { |
| 3558 | char *tbuf; |
| 3559 | tbuf = (char *) malloc(strlen(cookie) + 100); |
| 3560 | sprintf(tbuf, "%s,ANONTLS=%d,%s", uniq, anontls_selected, cookie); |
| 3561 | write(vncsock, tbuf, strlen(cookie)); |
| 3562 | goto wrote_cookie; |
| 3563 | } |
| 3564 | |
| 3565 | /* |
| 3566 | * things get messy below since we are trying to do |
| 3567 | * *both* VNC and Java applet httpd through the same |
| 3568 | * SSL socket. |
| 3569 | */ |
| 3570 | |
| 3571 | if (! screen) { |
| 3572 | close(vncsock); |
| 3573 | exit(1); |
| 3574 | } |
| 3575 | if (screen->httpListenSock >= 0 && screen->httpPort > 0) { |
| 3576 | have_httpd = 1; |
| 3577 | } else if (ipv6_http_fd >= 0) { |
| 3578 | have_httpd = 1; |
| 3579 | } else if (screen->httpListenSock == -2) { |
| 3580 | have_httpd = 1; |
| 3581 | } |
| 3582 | if (mode == OPENSSL_HTTPS && ! have_httpd) { |
| 3583 | rfbLog("SSL: accept_openssl[%d]: no httpd socket for " |
| 3584 | "-https mode\n", getpid()); |
| 3585 | close(vncsock); |
| 3586 | rfbLog("SSL: ssl_helper[%d]: exit case 3 (no httpd sock)\n", getpid()); |
| 3587 | exit(1); |
| 3588 | } |
| 3589 | |
| 3590 | if (have_httpd) { |
| 3591 | int n = 0, is_http = 0; |
| 3592 | int hport = screen->httpPort; |
| 3593 | char *iface = NULL; |
| 3594 | char *buf, *tbuf; |
| 3595 | |
| 3596 | buf = (char *) calloc((ABSIZE+1), 1); |
| 3597 | tbuf = (char *) calloc((2*ABSIZE+1), 1); |
| 3598 | |
| 3599 | if (mode == OPENSSL_HTTPS) { |
| 3600 | /* |
| 3601 | * for this mode we know it is HTTP traffic |
| 3602 | * so we skip trying to guess. |
| 3603 | */ |
| 3604 | is_http = 1; |
| 3605 | n = 0; |
| 3606 | goto connect_to_httpd; |
| 3607 | } |
| 3608 | |
| 3609 | /* |
| 3610 | * Check if there is stuff to read from remote end |
| 3611 | * if so it is likely a GET or HEAD. |
| 3612 | */ |
| 3613 | if (! is_ssl_readable(s_in, last_https, last_get, |
| 3614 | mode)) { |
| 3615 | goto write_cookie; |
| 3616 | } |
| 3617 | |
| 3618 | /* |
| 3619 | * read first 2 bytes to try to guess. sadly, |
| 3620 | * the user is often pondering a "non-verified |
| 3621 | * cert" dialog for a long time before the GET |
| 3622 | * is ever sent. So often we timeout here. |
| 3623 | */ |
| 3624 | |
| 3625 | if (db) fprintf(stderr, "watch_for_http_traffic\n"); |
| 3626 | |
| 3627 | is_http = watch_for_http_traffic(buf, &n, s_in); |
| 3628 | |
| 3629 | if (is_http < 0 || is_http == 0) { |
| 3630 | /* |
| 3631 | * error or http not detected, fall back |
| 3632 | * to normal VNC socket. |
| 3633 | */ |
| 3634 | if (db) fprintf(stderr, "is_http err: %d n: %d\n", is_http, n); |
| 3635 | write(vncsock, cookie, strlen(cookie)); |
| 3636 | if (n > 0) { |
| 3637 | write(vncsock, buf, n); |
| 3638 | } |
| 3639 | goto wrote_cookie; |
| 3640 | } |
| 3641 | |
| 3642 | if (db) fprintf(stderr, "is_http: %d n: %d\n", |
| 3643 | is_http, n); |
| 3644 | if (db) fprintf(stderr, "buf: '%s'\n", buf); |
| 3645 | |
| 3646 | if (strstr(buf, "/request.https.vnc.connection")) { |
| 3647 | char reply[] = "HTTP/1.0 200 OK\r\n" |
| 3648 | "Content-Type: octet-stream\r\n" |
| 3649 | "Connection: Keep-Alive\r\n" |
| 3650 | "VNC-Server: x11vnc\r\n" |
| 3651 | "Pragma: no-cache\r\n\r\n"; |
| 3652 | /* |
| 3653 | * special case proxy coming thru https |
| 3654 | * instead of a direct SSL connection. |
| 3655 | */ |
| 3656 | rfbLog("Handling VNC request via https GET. [%d]\n", getpid()); |
| 3657 | rfbLog("-- %s\n", buf); |
| 3658 | |
| 3659 | if (strstr(buf, "/reverse.proxy")) { |
| 3660 | char *buf2; |
| 3661 | int n, ptr; |
| 3662 | #if !LIBVNCSERVER_HAVE_LIBSSL |
| 3663 | write(s_out, reply, strlen(reply)); |
| 3664 | #else |
| 3665 | SSL_write(ssl, reply, strlen(reply)); |
| 3666 | #endif |
| 3667 | |
| 3668 | buf2 = (char *) calloc((8192+1), 1); |
| 3669 | n = 0; |
| 3670 | ptr = 0; |
| 3671 | while (ptr < 8192) { |
| 3672 | #if !LIBVNCSERVER_HAVE_LIBSSL |
| 3673 | n = read(s_in, buf2 + ptr, 1); |
| 3674 | #else |
| 3675 | n = SSL_read(ssl, buf2 + ptr, 1); |
| 3676 | #endif |
| 3677 | if (n > 0) { |
| 3678 | ptr += n; |
| 3679 | } |
| 3680 | if (db) fprintf(stderr, "buf2: '%s'\n", buf2); |
| 3681 | |
| 3682 | if (strstr(buf2, "\r\n\r\n")) { |
| 3683 | break; |
| 3684 | } |
| 3685 | } |
| 3686 | free(buf2); |
| 3687 | } |
| 3688 | goto write_cookie; |
| 3689 | |
| 3690 | } else if (strstr(buf, "/check.https.proxy.connection")) { |
| 3691 | char reply[] = "HTTP/1.0 200 OK\r\n" |
| 3692 | "Connection: close\r\n" |
| 3693 | "Content-Type: octet-stream\r\n" |
| 3694 | "VNC-Server: x11vnc\r\n" |
| 3695 | "Pragma: no-cache\r\n\r\n"; |
| 3696 | |
| 3697 | rfbLog("Handling Check HTTPS request via https GET. [%d]\n", getpid()); |
| 3698 | rfbLog("-- %s\n", buf); |
| 3699 | |
| 3700 | #if !LIBVNCSERVER_HAVE_LIBSSL |
| 3701 | write(s_out, reply, strlen(reply)); |
| 3702 | #else |
| 3703 | SSL_write(ssl, reply, strlen(reply)); |
| 3704 | SSL_shutdown(ssl); |
| 3705 | #endif |
| 3706 | |
| 3707 | strcpy(tbuf, uniq); |
| 3708 | strcat(tbuf, cookie); |
| 3709 | write(vncsock, tbuf, strlen(tbuf)); |
| 3710 | close(vncsock); |
| 3711 | |
| 3712 | rfbLog("SSL: ssl_helper[%d]: exit case 4 (check.https.proxy.connection)\n", getpid()); |
| 3713 | exit(0); |
| 3714 | } |
| 3715 | connect_to_httpd: |
| 3716 | |
| 3717 | /* |
| 3718 | * Here we go... no turning back. we have to |
| 3719 | * send failure to parent and close socket to have |
| 3720 | * http processed at all in a timely fashion... |
| 3721 | */ |
| 3722 | |
| 3723 | /* send the failure tag: */ |
| 3724 | strcpy(tbuf, uniq); |
| 3725 | |
| 3726 | if (https_port_redir < 0 || (strstr(buf, "PORT=") || strstr(buf, "port="))) { |
| 3727 | char *q = strstr(buf, "Host:"); |
| 3728 | int fport = 443, match = 0; |
| 3729 | char num[16]; |
| 3730 | |
| 3731 | if (q && strstr(q, "\n")) { |
| 3732 | q += strlen("Host:") + 1; |
| 3733 | while (*q != '\n') { |
| 3734 | int p; |
| 3735 | if (*q == ':' && sscanf(q, ":%d", &p) == 1) { |
| 3736 | if (p > 0 && p < 65536) { |
| 3737 | fport = p; |
| 3738 | match = 1; |
| 3739 | break; |
| 3740 | } |
| 3741 | } |
| 3742 | q++; |
| 3743 | } |
| 3744 | } |
| 3745 | if (!match || !https_port_redir) { |
| 3746 | int p; |
| 3747 | if (sscanf(buf, "PORT=%d,", &p) == 1) { |
| 3748 | if (p > 0 && p < 65536) { |
| 3749 | fport = p; |
| 3750 | } |
| 3751 | } else if (sscanf(buf, "port=%d,", &p) == 1) { |
| 3752 | if (p > 0 && p < 65536) { |
| 3753 | fport = p; |
| 3754 | } |
| 3755 | } |
| 3756 | } |
| 3757 | sprintf(num, "HP=%d,", fport); |
| 3758 | strcat(tbuf, num); |
| 3759 | } |
| 3760 | |
| 3761 | if (strstr(buf, "HTTP/") != NULL) { |
| 3762 | char *q, *str; |
| 3763 | /* |
| 3764 | * Also send back the GET line for heuristics. |
| 3765 | * (last_https, get file). |
| 3766 | */ |
| 3767 | str = strdup(buf); |
| 3768 | q = strstr(str, "HTTP/"); |
| 3769 | if (q != NULL) { |
| 3770 | *q = '\0'; |
| 3771 | strcat(tbuf, str); |
| 3772 | } |
| 3773 | free(str); |
| 3774 | } |
| 3775 | |
| 3776 | /* |
| 3777 | * Also send the cookie to pad out the number of |
| 3778 | * bytes to more than the parent wants to read. |
| 3779 | * Since this is the failure case, it does not |
| 3780 | * matter that we send more than strlen(cookie). |
| 3781 | */ |
| 3782 | strcat(tbuf, cookie); |
| 3783 | write(vncsock, tbuf, strlen(tbuf)); |
| 3784 | |
| 3785 | usleep(150*1000); |
| 3786 | if (db) fprintf(stderr, "close vncsock: %d\n", vncsock); |
| 3787 | close(vncsock); |
| 3788 | |
| 3789 | /* now, finally, connect to the libvncserver httpd: */ |
| 3790 | if (screen->listenInterface == htonl(INADDR_ANY) || |
| 3791 | screen->listenInterface == htonl(INADDR_NONE)) { |
| 3792 | iface = "127.0.0.1"; |
| 3793 | } else { |
| 3794 | struct in_addr in; |
| 3795 | in.s_addr = screen->listenInterface; |
| 3796 | iface = inet_ntoa(in); |
| 3797 | } |
| 3798 | if (iface == NULL || !strcmp(iface, "")) { |
| 3799 | iface = "127.0.0.1"; |
| 3800 | } |
| 3801 | if (db) fprintf(stderr, "iface: %s:%d\n", iface, hport); |
| 3802 | usleep(150*1000); |
| 3803 | |
| 3804 | httpsock = connect_tcp(iface, hport); |
| 3805 | |
| 3806 | if (httpsock < 0) { |
| 3807 | /* UGH, after all of that! */ |
| 3808 | rfbLog("Could not connect to httpd socket!\n"); |
| 3809 | rfbLog("SSL: ssl_helper[%d]: exit case 5.\n", getpid()); |
| 3810 | exit(1); |
| 3811 | } |
| 3812 | if (db) fprintf(stderr, "ssl_helper[%d]: httpsock: %d %d\n", |
| 3813 | getpid(), httpsock, n); |
| 3814 | |
| 3815 | /* |
| 3816 | * send what we read to httpd, and then connect |
| 3817 | * the rest of the SSL session to it: |
| 3818 | */ |
| 3819 | if (n > 0) { |
| 3820 | char *s = getenv("X11VNC_EXTRA_HTTPS_PARAMS"); |
| 3821 | int did_extra = 0; |
| 3822 | |
| 3823 | if (db) fprintf(stderr, "sending http buffer httpsock: %d n=%d\n'%s'\n", httpsock, n, buf); |
| 3824 | if (s != NULL) { |
| 3825 | char *q = strstr(buf, " HTTP/"); |
| 3826 | if (q) { |
| 3827 | int m; |
| 3828 | *q = '\0'; |
| 3829 | m = strlen(buf); |
| 3830 | write(httpsock, buf, m); |
| 3831 | write(httpsock, s, strlen(s)); |
| 3832 | *q = ' '; |
| 3833 | write(httpsock, q, n-m); |
| 3834 | did_extra = 1; |
| 3835 | } |
| 3836 | } |
| 3837 | if (!did_extra) { |
| 3838 | write(httpsock, buf, n); |
| 3839 | } |
| 3840 | } |
| 3841 | ssl_xfer(httpsock, s_in, s_out, is_http); |
| 3842 | rfbLog("SSL: ssl_helper[%d]: exit case 6 (https ssl_xfer done)\n", getpid()); |
| 3843 | exit(0); |
| 3844 | } |
| 3845 | |
| 3846 | /* |
| 3847 | * ok, back from the above https mess, simply send the |
| 3848 | * cookie back to the parent (who will attach us to |
| 3849 | * libvncserver), and connect the rest of the SSL session |
| 3850 | * to it. |
| 3851 | */ |
| 3852 | write_cookie: |
| 3853 | write(vncsock, cookie, strlen(cookie)); |
| 3854 | |
| 3855 | wrote_cookie: |
| 3856 | ssl_xfer(vncsock, s_in, s_out, 0); |
| 3857 | rfbLog("SSL: ssl_helper[%d]: exit case 7 (ssl_xfer done)\n", getpid()); |
| 3858 | if (0) usleep(50 * 1000); |
| 3859 | exit(0); |
| 3860 | } |
| 3861 | /* parent here */ |
| 3862 | |
| 3863 | if (mode != OPENSSL_INETD) { |
| 3864 | close(sock); |
| 3865 | } |
| 3866 | if (db) fprintf(stderr, "helper process is: %d\n", pid); |
| 3867 | |
| 3868 | /* accept connection from our child. */ |
| 3869 | signal(SIGALRM, csock_timeout); |
| 3870 | csock_timeout_sock = csock; |
| 3871 | alarm(20); |
| 3872 | |
| 3873 | vsock = accept(csock, (struct sockaddr *)&addr, &addrlen); |
| 3874 | |
| 3875 | alarm(0); |
| 3876 | signal(SIGALRM, SIG_DFL); |
| 3877 | close(csock); |
| 3878 | |
| 3879 | |
| 3880 | if (vsock < 0) { |
| 3881 | rfbLog("SSL: accept_openssl: connection from ssl_helper[%d] FAILED.\n", pid); |
| 3882 | rfbLogPerror("accept"); |
| 3883 | |
| 3884 | kill(pid, SIGTERM); |
| 3885 | waitpid(pid, &status, WNOHANG); |
| 3886 | if (mode == OPENSSL_INETD || ssl_no_fail) { |
| 3887 | clean_up_exit(1); |
| 3888 | } |
| 3889 | if (certret_fd >= 0) { |
| 3890 | close(certret_fd); |
| 3891 | certret_fd = -1; |
| 3892 | } |
| 3893 | if (certret) { |
| 3894 | unlink(certret); |
| 3895 | } |
| 3896 | if (dhret_fd >= 0) { |
| 3897 | close(dhret_fd); |
| 3898 | dhret_fd = -1; |
| 3899 | } |
| 3900 | if (dhret) { |
| 3901 | unlink(dhret); |
| 3902 | } |
| 3903 | return; |
| 3904 | } |
| 3905 | if (db) fprintf(stderr, "accept_openssl: vsock: %d\n", vsock); |
| 3906 | |
| 3907 | n = read(vsock, rcookie, strlen(cookie)); |
| 3908 | if (n < 0 && errno != 0) { |
| 3909 | rfbLogPerror("read"); |
| 3910 | } |
| 3911 | |
| 3912 | if (certret) { |
| 3913 | struct stat sbuf; |
| 3914 | sbuf.st_size = 0; |
| 3915 | if (certret_fd >= 0 && stat(certret, &sbuf) == 0 && sbuf.st_size > 0) { |
| 3916 | certret_str = (char *) calloc(sbuf.st_size+1, 1); |
| 3917 | read(certret_fd, certret_str, sbuf.st_size); |
| 3918 | close(certret_fd); |
| 3919 | certret_fd = -1; |
| 3920 | } |
| 3921 | if (certret_fd >= 0) { |
| 3922 | close(certret_fd); |
| 3923 | certret_fd = -1; |
| 3924 | } |
| 3925 | unlink(certret); |
| 3926 | if (certret_str && strstr(certret_str, "NOCERT") == certret_str) { |
| 3927 | free(certret_str); |
| 3928 | certret_str = NULL; |
| 3929 | } |
| 3930 | if (0 && certret_str) { |
| 3931 | fprintf(stderr, "certret_str[%d]:\n%s\n", (int) sbuf.st_size, certret_str); |
| 3932 | } |
| 3933 | } |
| 3934 | |
| 3935 | if (dhret) { |
| 3936 | struct stat sbuf; |
| 3937 | sbuf.st_size = 0; |
| 3938 | if (dhret_fd >= 0 && stat(dhret, &sbuf) == 0 && sbuf.st_size > 0) { |
| 3939 | dhret_str = (char *) calloc(sbuf.st_size+1, 1); |
| 3940 | read(dhret_fd, dhret_str, sbuf.st_size); |
| 3941 | close(dhret_fd); |
| 3942 | dhret_fd = -1; |
| 3943 | } |
| 3944 | if (dhret_fd >= 0) { |
| 3945 | close(dhret_fd); |
| 3946 | dhret_fd = -1; |
| 3947 | } |
| 3948 | unlink(dhret); |
| 3949 | if (dhret_str && strstr(dhret_str, "NOCERT") == dhret_str) { |
| 3950 | free(dhret_str); |
| 3951 | dhret_str = NULL; |
| 3952 | } |
| 3953 | if (dhret_str) { |
| 3954 | if (new_dh_params == NULL) { |
| 3955 | fprintf(stderr, "dhret_str[%d]:\n%s\n", (int) sbuf.st_size, dhret_str); |
| 3956 | new_dh_params = strdup(dhret_str); |
| 3957 | } |
| 3958 | } |
| 3959 | } |
| 3960 | |
| 3961 | if (0) { |
| 3962 | fprintf(stderr, "rcookie: %s\n", rcookie); |
| 3963 | fprintf(stderr, "cookie: %s\n", cookie); |
| 3964 | } |
| 3965 | |
| 3966 | if (strstr(rcookie, uniq) == rcookie) { |
| 3967 | char *q = strstr(rcookie, "RB="); |
| 3968 | if (q && strstr(cookie, q) == cookie) { |
| 3969 | vencrypt_sel = 0; |
| 3970 | anontls_sel = 0; |
| 3971 | q = strstr(rcookie, "VENCRYPT="); |
| 3972 | if (q && sscanf(q, "VENCRYPT=%d,", &vencrypt_sel) == 1) { |
| 3973 | if (vencrypt_sel != 0) { |
| 3974 | rfbLog("SSL: VENCRYPT mode=%d accepted. helper[%d]\n", vencrypt_sel, pid); |
| 3975 | goto accept_client; |
| 3976 | } |
| 3977 | } |
| 3978 | q = strstr(rcookie, "ANONTLS="); |
| 3979 | if (q && sscanf(q, "ANONTLS=%d,", &anontls_sel) == 1) { |
| 3980 | if (anontls_sel != 0) { |
| 3981 | rfbLog("SSL: ANONTLS mode=%d accepted. helper[%d]\n", anontls_sel, pid); |
| 3982 | goto accept_client; |
| 3983 | } |
| 3984 | } |
| 3985 | } |
| 3986 | } |
| 3987 | |
| 3988 | if (n != (int) strlen(cookie) || strncmp(cookie, rcookie, n)) { |
| 3989 | rfbLog("SSL: accept_openssl: cookie from ssl_helper[%d] FAILED. %d\n", pid, n); |
| 3990 | if (db) fprintf(stderr, "'%s'\n'%s'\n", cookie, rcookie); |
| 3991 | close(vsock); |
| 3992 | |
| 3993 | if (strstr(rcookie, uniq) == rcookie) { |
| 3994 | int i; |
| 3995 | double https_download_wait_time = 15.0; |
| 3996 | |
| 3997 | if (getenv("X11VNC_HTTPS_DOWNLOAD_WAIT_TIME")) { |
| 3998 | https_download_wait_time = atof(getenv("X11VNC_HTTPS_DOWNLOAD_WAIT_TIME")); |
| 3999 | } |
| 4000 | |
| 4001 | rfbLog("SSL: BUT WAIT! HTTPS for helper process[%d] succeeded. Good.\n", pid); |
| 4002 | if (mode != OPENSSL_HTTPS) { |
| 4003 | last_https = dnow(); |
| 4004 | for (i=0; i<256; i++) { |
| 4005 | last_get[i] = '\0'; |
| 4006 | } |
| 4007 | strncpy(last_get, rcookie, 100); |
| 4008 | if (db) fprintf(stderr, "last_get: '%s'\n", last_get); |
| 4009 | } |
| 4010 | if (rcookie && strstr(rcookie, "VncViewer.class")) { |
| 4011 | rfbLog("\n"); |
| 4012 | rfbLog("helper[%d]:\n", pid); |
| 4013 | rfbLog("***********************************************************\n"); |
| 4014 | rfbLog("SSL: WARNING CLIENT ASKED FOR NONEXISTENT 'VncViewer.class'\n"); |
| 4015 | rfbLog("SSL: USER NEEDS TO MAKE SURE THE JAVA PLUGIN IS INSTALLED\n"); |
| 4016 | rfbLog("SSL: AND WORKING PROPERLY (e.g. a test-java-plugin page.)\n"); |
| 4017 | rfbLog("SSL: AND/OR USER NEEDS TO **RESTART** HIS WEB BROWSER.\n"); |
| 4018 | rfbLog("SSL: SOMETIMES THE BROWSER 'REMEMBERS' FAILED APPLET DOWN-\n"); |
| 4019 | rfbLog("SSL: LOADS AND RESTARTING IT IS THE ONLY WAY TO FIX THINGS.\n"); |
| 4020 | rfbLog("***********************************************************\n"); |
| 4021 | rfbLog("\n"); |
| 4022 | } |
| 4023 | ssl_helper_pid(pid, -2); |
| 4024 | |
| 4025 | if (https_port_redir) { |
| 4026 | double start; |
| 4027 | int origport = screen->port; |
| 4028 | int useport = screen->port; |
| 4029 | int saw_httpsock = 0; |
| 4030 | /* to expand $PORT correctly in index.vnc */ |
| 4031 | if (https_port_redir < 0) { |
| 4032 | char *q = strstr(rcookie, "HP="); |
| 4033 | if (q) { |
| 4034 | int p; |
| 4035 | if (sscanf(q, "HP=%d,", &p) == 1) { |
| 4036 | useport = p; |
| 4037 | } |
| 4038 | } |
| 4039 | } else { |
| 4040 | useport = https_port_redir; |
| 4041 | } |
| 4042 | screen->port = useport; |
| 4043 | if (origport != useport) { |
| 4044 | rfbLog("SSL: -httpsredir guess port: %d helper[%d]\n", screen->port, pid); |
| 4045 | } |
| 4046 | |
| 4047 | start = dnow(); |
| 4048 | while (dnow() < start + https_download_wait_time) { |
| 4049 | if (screen->httpSock >= 0) saw_httpsock = 1; |
| 4050 | rfbPE(10000); |
| 4051 | usleep(10000); |
| 4052 | if (screen->httpSock >= 0) saw_httpsock = 1; |
| 4053 | waitpid(pid, &status, WNOHANG); |
| 4054 | if (kill(pid, 0) != 0) { |
| 4055 | rfbLog("SSL: helper[%d] pid finished\n", pid); |
| 4056 | break; |
| 4057 | } |
| 4058 | if (0 && saw_httpsock && screen->httpSock < 0) { |
| 4059 | /* this check can kill the helper too soon. */ |
| 4060 | rfbLog("SSL: httpSock for helper[%d] went away\n", pid); |
| 4061 | break; |
| 4062 | } |
| 4063 | } |
| 4064 | rfbLog("SSL: guessing child helper[%d] https finished. dt=%.6f\n", |
| 4065 | pid, dnow() - start); |
| 4066 | |
| 4067 | rfbPE(10000); |
| 4068 | rfbPE(10000); |
| 4069 | rfbPE(10000); |
| 4070 | |
| 4071 | screen->port = origport; |
| 4072 | ssl_helper_pid(0, -2); |
| 4073 | if (mode == OPENSSL_INETD) { |
| 4074 | clean_up_exit(1); |
| 4075 | } |
| 4076 | } else if (mode == OPENSSL_INETD) { |
| 4077 | double start; |
| 4078 | int saw_httpsock = 0; |
| 4079 | |
| 4080 | /* to expand $PORT correctly in index.vnc */ |
| 4081 | if (screen->port == 0) { |
| 4082 | int fd = fileno(stdin); |
| 4083 | if (getenv("X11VNC_INETD_PORT")) { |
| 4084 | /* mutex */ |
| 4085 | screen->port = atoi(getenv( |
| 4086 | "X11VNC_INETD_PORT")); |
| 4087 | } else { |
| 4088 | int tport = get_local_port(fd); |
| 4089 | if (tport > 0) { |
| 4090 | screen->port = tport; |
| 4091 | } |
| 4092 | } |
| 4093 | } |
| 4094 | rfbLog("SSL: screen->port %d for helper[%d]\n", screen->port, pid); |
| 4095 | |
| 4096 | /* kludge for https fetch via inetd */ |
| 4097 | start = dnow(); |
| 4098 | while (dnow() < start + https_download_wait_time) { |
| 4099 | if (screen->httpSock >= 0) saw_httpsock = 1; |
| 4100 | rfbPE(10000); |
| 4101 | usleep(10000); |
| 4102 | if (screen->httpSock >= 0) saw_httpsock = 1; |
| 4103 | waitpid(pid, &status, WNOHANG); |
| 4104 | if (kill(pid, 0) != 0) { |
| 4105 | rfbLog("SSL: helper[%d] pid finished\n", pid); |
| 4106 | break; |
| 4107 | } |
| 4108 | if (0 && saw_httpsock && screen->httpSock < 0) { |
| 4109 | /* this check can kill the helper too soon. */ |
| 4110 | rfbLog("SSL: httpSock for helper[%d] went away\n", pid); |
| 4111 | break; |
| 4112 | } |
| 4113 | } |
| 4114 | rfbLog("SSL: OPENSSL_INETD guessing " |
| 4115 | "child helper[%d] https finished. dt=%.6f\n", |
| 4116 | pid, dnow() - start); |
| 4117 | |
| 4118 | rfbPE(10000); |
| 4119 | rfbPE(10000); |
| 4120 | rfbPE(10000); |
| 4121 | |
| 4122 | ssl_helper_pid(0, -2); |
| 4123 | clean_up_exit(1); |
| 4124 | } |
| 4125 | /* this will actually only get earlier https */ |
| 4126 | ssl_helper_pid(0, -2); |
| 4127 | return; |
| 4128 | } |
| 4129 | kill(pid, SIGTERM); |
| 4130 | waitpid(pid, &status, WNOHANG); |
| 4131 | if (mode == OPENSSL_INETD || ssl_no_fail) { |
| 4132 | clean_up_exit(1); |
| 4133 | } |
| 4134 | return; |
| 4135 | } |
| 4136 | |
| 4137 | accept_client: |
| 4138 | |
| 4139 | if (db) fprintf(stderr, "accept_openssl: cookie good: %s\n", cookie); |
| 4140 | |
| 4141 | rfbLog("SSL: handshake with helper process[%d] succeeded.\n", pid); |
| 4142 | |
| 4143 | openssl_last_helper_pid = pid; |
| 4144 | ssl_helper_pid(pid, vsock); |
| 4145 | |
| 4146 | if (vnc_redirect) { |
| 4147 | vnc_redirect_sock = vsock; |
| 4148 | openssl_last_helper_pid = 0; |
| 4149 | return; |
| 4150 | } |
| 4151 | |
| 4152 | client = create_new_client(vsock, 0); |
| 4153 | openssl_last_helper_pid = 0; |
| 4154 | |
| 4155 | if (client) { |
| 4156 | int swt = 0; |
| 4157 | if (mode == OPENSSL_VNC6 && openssl_last_ip != NULL) { |
| 4158 | swt = 1; |
| 4159 | } else if (mode == OPENSSL_REVERSE && ipv6_name != NULL && openssl_last_ip != NULL) { |
| 4160 | swt = 1; |
| 4161 | } |
| 4162 | if (swt) { |
| 4163 | if (client->host) { |
| 4164 | free(client->host); |
| 4165 | } |
| 4166 | client->host = strdup(openssl_last_ip); |
| 4167 | } |
| 4168 | if (db) fprintf(stderr, "accept_openssl: client %p\n", (void *) client); |
| 4169 | if (db) fprintf(stderr, "accept_openssl: new_client %p\n", (void *) screen->newClientHook); |
| 4170 | if (db) fprintf(stderr, "accept_openssl: new_client %p\n", (void *) new_client); |
| 4171 | if (mode == OPENSSL_INETD) { |
| 4172 | inetd_client = client; |
| 4173 | client->clientGoneHook = client_gone; |
| 4174 | } |
| 4175 | if (openssl_last_ip && |
| 4176 | strpbrk(openssl_last_ip, "0123456789") == openssl_last_ip) { |
| 4177 | client->host = strdup(openssl_last_ip); |
| 4178 | } |
| 4179 | if (vencrypt_sel != 0) { |
| 4180 | client->protocolMajorVersion = 3; |
| 4181 | client->protocolMinorVersion = 8; |
| 4182 | #if LIBVNCSERVER_HAVE_LIBSSL |
| 4183 | if (!finish_vencrypt_auth(client, vencrypt_sel)) { |
| 4184 | rfbCloseClient(client); |
| 4185 | client = NULL; |
| 4186 | } |
| 4187 | #else |
| 4188 | badnews("3 accept_openssl"); |
| 4189 | #endif |
| 4190 | } else if (anontls_sel != 0) { |
| 4191 | client->protocolMajorVersion = 3; |
| 4192 | client->protocolMinorVersion = 8; |
| 4193 | rfbAuthNewClient(client); |
| 4194 | } |
| 4195 | if (use_threads && client != NULL) { |
| 4196 | rfbStartOnHoldClient(client); |
| 4197 | } |
| 4198 | /* try to get RFB proto done now. */ |
| 4199 | progress_client(); |
| 4200 | } else { |
| 4201 | rfbLog("SSL: accept_openssl: rfbNewClient failed.\n"); |
| 4202 | close(vsock); |
| 4203 | |
| 4204 | kill(pid, SIGTERM); |
| 4205 | waitpid(pid, &status, WNOHANG); |
| 4206 | if (mode == OPENSSL_INETD || ssl_no_fail) { |
| 4207 | clean_up_exit(1); |
| 4208 | } |
| 4209 | return; |
| 4210 | } |
| 4211 | } |
| 4212 | |
| 4213 | void raw_xfer(int csock, int s_in, int s_out) { |
| 4214 | char buf0[8192]; |
| 4215 | int sz = 8192, n, m, status, db = 1; |
| 4216 | char *buf; |
| 4217 | #ifdef FORK_OK |
| 4218 | pid_t par = getpid(); |
| 4219 | pid_t pid = fork(); |
| 4220 | |
| 4221 | buf = buf0; |
| 4222 | if (vnc_redirect) { |
| 4223 | /* change buf size some direction. */ |
| 4224 | } |
| 4225 | |
| 4226 | if (getenv("X11VNC_DEBUG_RAW_XFER")) { |
| 4227 | db = atoi(getenv("X11VNC_DEBUG_RAW_XFER")); |
| 4228 | } |
| 4229 | if (pid < 0) { |
| 4230 | exit(1); |
| 4231 | } |
| 4232 | /* this is for testing or special helper usage, no SSL just socket redir */ |
| 4233 | if (pid) { |
| 4234 | if (db) rfbLog("raw_xfer start: %d -> %d/%d\n", csock, s_in, s_out); |
| 4235 | |
| 4236 | while (1) { |
| 4237 | n = read(csock, buf, sz); |
| 4238 | if (n == 0 || (n < 0 && errno != EINTR) ) { |
| 4239 | break; |
| 4240 | } else if (n > 0) { |
| 4241 | int len = n; |
| 4242 | char *src = buf; |
| 4243 | if (db > 1) write(2, buf, n); |
| 4244 | while (len > 0) { |
| 4245 | m = write(s_out, src, len); |
| 4246 | if (m > 0) { |
| 4247 | src += m; |
| 4248 | len -= m; |
| 4249 | continue; |
| 4250 | } |
| 4251 | if (m < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 4252 | continue; |
| 4253 | } |
| 4254 | if (db) rfbLog("raw_xfer bad write: %d -> %d | %d/%d errno=%d\n", csock, s_out, m, n, errno); |
| 4255 | break; |
| 4256 | } |
| 4257 | } |
| 4258 | } |
| 4259 | usleep(250*1000); |
| 4260 | kill(pid, SIGTERM); |
| 4261 | waitpid(pid, &status, WNOHANG); |
| 4262 | if (db) rfbLog("raw_xfer done: %d -> %d\n", csock, s_out); |
| 4263 | |
| 4264 | } else { |
| 4265 | if (db) usleep(50*1000); |
| 4266 | if (db) rfbLog("raw_xfer start: %d <- %d\n", csock, s_in); |
| 4267 | |
| 4268 | while (1) { |
| 4269 | n = read(s_in, buf, sz); |
| 4270 | if (n == 0 || (n < 0 && errno != EINTR) ) { |
| 4271 | break; |
| 4272 | } else if (n > 0) { |
| 4273 | int len = n; |
| 4274 | char *src = buf; |
| 4275 | if (db > 1) write(2, buf, n); |
| 4276 | while (len > 0) { |
| 4277 | m = write(csock, src, len); |
| 4278 | if (m > 0) { |
| 4279 | src += m; |
| 4280 | len -= m; |
| 4281 | continue; |
| 4282 | } |
| 4283 | if (m < 0 && (errno == EINTR || errno == EAGAIN)) { |
| 4284 | continue; |
| 4285 | } |
| 4286 | if (db) rfbLog("raw_xfer bad write: %d <- %d | %d/%d errno=%d\n", csock, s_in, m, n, errno); |
| 4287 | break; |
| 4288 | } |
| 4289 | } |
| 4290 | } |
| 4291 | usleep(250*1000); |
| 4292 | kill(par, SIGTERM); |
| 4293 | waitpid(par, &status, WNOHANG); |
| 4294 | if (db) rfbLog("raw_xfer done: %d <- %d\n", csock, s_in); |
| 4295 | } |
| 4296 | close(csock); |
| 4297 | close(s_in); |
| 4298 | close(s_out); |
| 4299 | #endif /* FORK_OK */ |
| 4300 | } |
| 4301 | |
| 4302 | /* compile with -DENC_HAVE_OPENSSL=0 to disable enc stuff but still have ssl */ |
| 4303 | |
| 4304 | #define ENC_MODULE |
| 4305 | |
| 4306 | #if LIBVNCSERVER_HAVE_LIBSSL |
| 4307 | #ifndef ENC_HAVE_OPENSSL |
| 4308 | #define ENC_HAVE_OPENSSL 1 |
| 4309 | #endif |
| 4310 | #else |
| 4311 | #define ENC_HAVE_OPENSSL 0 |
| 4312 | #endif |
| 4313 | |
| 4314 | #define ENC_DISABLE_SHOW_CERT |
| 4315 | |
| 4316 | #include "enc.h" |
| 4317 | |
| 4318 | static void symmetric_encryption_xfer(int csock, int s_in, int s_out) { |
| 4319 | char tmp[100]; |
| 4320 | char *cipher, *keyfile, *q; |
| 4321 | |
| 4322 | if (! enc_str) { |
| 4323 | return; |
| 4324 | } |
| 4325 | cipher = (char *) malloc(strlen(enc_str) + 100); |
| 4326 | q = strchr(enc_str, ':'); |
| 4327 | if (!q) return; |
| 4328 | *q = '\0'; |
| 4329 | if (getenv("X11VNC_USE_ULTRADSM_IV")) { |
| 4330 | sprintf(cipher, "rev:%s", enc_str); |
| 4331 | } else { |
| 4332 | sprintf(cipher, "noultra:rev:%s", enc_str); |
| 4333 | } |
| 4334 | keyfile = strdup(q+1); |
| 4335 | *q = ':'; |
| 4336 | |
| 4337 | |
| 4338 | /* TBD: s_in != s_out */ |
| 4339 | if (s_out) {} |
| 4340 | |
| 4341 | sprintf(tmp, "fd=%d,%d", s_in, csock); |
| 4342 | |
| 4343 | enc_do(cipher, keyfile, "-1", tmp); |
| 4344 | } |
| 4345 | |