1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686
|
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
/*
* Source file for all GnuTLS-specific code for the TLS/SSL layer. No code
* but vtls.c should ever call or use these functions.
*
* Note: don't use the GnuTLS' *_t variable type names in this source code,
* since they were not present in 1.0.X.
*/
#include "curl_setup.h"
#ifdef USE_GNUTLS
#include <gnutls/abstract.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#ifdef USE_GNUTLS_NETTLE
#include <gnutls/crypto.h>
#include <nettle/md5.h>
#include <nettle/sha2.h>
#else
#include <gcrypt.h>
#endif
#include "urldata.h"
#include "sendf.h"
#include "inet_pton.h"
#include "gtls.h"
#include "vtls.h"
#include "parsedate.h"
#include "connect.h" /* for the connect timeout */
#include "select.h"
#include "strcase.h"
#include "warnless.h"
#include "x509asn1.h"
#include "multiif.h"
#include "curl_printf.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/* Enable GnuTLS debugging by defining GTLSDEBUG */
/*#define GTLSDEBUG */
#ifdef GTLSDEBUG
static void tls_log_func(int level, const char *str)
{
fprintf(stderr, "|<%d>| %s", level, str);
}
#endif
static bool gtls_inited = FALSE;
#if !defined(GNUTLS_VERSION_NUMBER) || (GNUTLS_VERSION_NUMBER < 0x03010a)
#error "too old GnuTLS version"
#endif
# include <gnutls/ocsp.h>
struct ssl_backend_data {
gnutls_session_t session;
gnutls_certificate_credentials_t cred;
#ifdef USE_TLS_SRP
gnutls_srp_client_credentials_t srp_client_cred;
#endif
};
static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
{
curl_socket_t sock = *(curl_socket_t *)s;
ssize_t ret = swrite(sock, buf, len);
return ret;
}
static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len)
{
curl_socket_t sock = *(curl_socket_t *)s;
ssize_t ret = sread(sock, buf, len);
return ret;
}
static ssize_t Curl_gtls_push_ssl(void *s, const void *buf, size_t len)
{
return gnutls_record_send((gnutls_session_t) s, buf, len);
}
static ssize_t Curl_gtls_pull_ssl(void *s, void *buf, size_t len)
{
return gnutls_record_recv((gnutls_session_t) s, buf, len);
}
/* Curl_gtls_init()
*
* Global GnuTLS init, called from Curl_ssl_init(). This calls functions that
* are not thread-safe and thus this function itself is not thread-safe and
* must only be called from within curl_global_init() to keep the thread
* situation under control!
*/
static int Curl_gtls_init(void)
{
int ret = 1;
if(!gtls_inited) {
ret = gnutls_global_init()?0:1;
#ifdef GTLSDEBUG
gnutls_global_set_log_function(tls_log_func);
gnutls_global_set_log_level(2);
#endif
gtls_inited = TRUE;
}
return ret;
}
static void Curl_gtls_cleanup(void)
{
if(gtls_inited) {
gnutls_global_deinit();
gtls_inited = FALSE;
}
}
#ifndef CURL_DISABLE_VERBOSE_STRINGS
static void showtime(struct Curl_easy *data,
const char *text,
time_t stamp)
{
struct tm buffer;
const struct tm *tm = &buffer;
char str[96];
CURLcode result = Curl_gmtime(stamp, &buffer);
if(result)
return;
msnprintf(str,
sizeof(str),
"\t %s: %s, %02d %s %4d %02d:%02d:%02d GMT",
text,
Curl_wkday[tm->tm_wday?tm->tm_wday-1:6],
tm->tm_mday,
Curl_month[tm->tm_mon],
tm->tm_year + 1900,
tm->tm_hour,
tm->tm_min,
tm->tm_sec);
infof(data, "%s\n", str);
}
#endif
static gnutls_datum_t load_file(const char *file)
{
FILE *f;
gnutls_datum_t loaded_file = { NULL, 0 };
long filelen;
void *ptr;
f = fopen(file, "rb");
if(!f)
return loaded_file;
if(fseek(f, 0, SEEK_END) != 0
|| (filelen = ftell(f)) < 0
|| fseek(f, 0, SEEK_SET) != 0
|| !(ptr = malloc((size_t)filelen)))
goto out;
if(fread(ptr, 1, (size_t)filelen, f) < (size_t)filelen) {
free(ptr);
goto out;
}
loaded_file.data = ptr;
loaded_file.size = (unsigned int)filelen;
out:
fclose(f);
return loaded_file;
}
static void unload_file(gnutls_datum_t data)
{
free(data.data);
}
/* this function does a SSL/TLS (re-)handshake */
static CURLcode handshake(struct connectdata *conn,
int sockindex,
bool duringconnect,
bool nonblocking)
{
struct Curl_easy *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct ssl_backend_data *backend = connssl->backend;
gnutls_session_t session = backend->session;
curl_socket_t sockfd = conn->sock[sockindex];
for(;;) {
timediff_t timeout_ms;
int rc;
/* check allowed time left */
timeout_ms = Curl_timeleft(data, NULL, duringconnect);
if(timeout_ms < 0) {
/* no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
/* if ssl is expecting something, check if it's available. */
if(connssl->connecting_state == ssl_connect_2_reading
|| connssl->connecting_state == ssl_connect_2_writing) {
int what;
curl_socket_t writefd = ssl_connect_2_writing ==
connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
curl_socket_t readfd = ssl_connect_2_reading ==
connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
nonblocking?0:
timeout_ms?timeout_ms:1000);
if(what < 0) {
/* fatal error */
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
return CURLE_SSL_CONNECT_ERROR;
}
else if(0 == what) {
if(nonblocking)
return CURLE_OK;
else if(timeout_ms) {
/* timeout */
failf(data, "SSL connection timeout at %ld", (long)timeout_ms);
return CURLE_OPERATION_TIMEDOUT;
}
}
/* socket is readable or writable */
}
rc = gnutls_handshake(session);
if((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED)) {
connssl->connecting_state =
gnutls_record_get_direction(session)?
ssl_connect_2_writing:ssl_connect_2_reading;
continue;
}
else if((rc < 0) && !gnutls_error_is_fatal(rc)) {
const char *strerr = NULL;
if(rc == GNUTLS_E_WARNING_ALERT_RECEIVED) {
int alert = gnutls_alert_get(session);
strerr = gnutls_alert_get_name(alert);
}
if(strerr == NULL)
strerr = gnutls_strerror(rc);
infof(data, "gnutls_handshake() warning: %s\n", strerr);
continue;
}
else if(rc < 0) {
const char *strerr = NULL;
if(rc == GNUTLS_E_FATAL_ALERT_RECEIVED) {
int alert = gnutls_alert_get(session);
strerr = gnutls_alert_get_name(alert);
}
if(strerr == NULL)
strerr = gnutls_strerror(rc);
failf(data, "gnutls_handshake() failed: %s", strerr);
return CURLE_SSL_CONNECT_ERROR;
}
/* Reset our connect state machine */
connssl->connecting_state = ssl_connect_1;
return CURLE_OK;
}
}
static gnutls_x509_crt_fmt_t do_file_type(const char *type)
{
if(!type || !type[0])
return GNUTLS_X509_FMT_PEM;
if(strcasecompare(type, "PEM"))
return GNUTLS_X509_FMT_PEM;
if(strcasecompare(type, "DER"))
return GNUTLS_X509_FMT_DER;
return -1;
}
#define GNUTLS_CIPHERS "NORMAL:-ARCFOUR-128:-CTYPE-ALL:+CTYPE-X509"
/* If GnuTLS was compiled without support for SRP it will error out if SRP is
requested in the priority string, so treat it specially
*/
#define GNUTLS_SRP "+SRP"
static CURLcode
set_ssl_version_min_max(const char **prioritylist, struct connectdata *conn)
{
struct Curl_easy *data = conn->data;
long ssl_version = SSL_CONN_CONFIG(version);
long ssl_version_max = SSL_CONN_CONFIG(version_max);
if(ssl_version_max == CURL_SSLVERSION_MAX_NONE) {
ssl_version_max = CURL_SSLVERSION_MAX_DEFAULT;
}
switch(ssl_version | ssl_version_max) {
case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_TLSv1_0:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.0";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_TLSv1_1:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.0:+VERS-TLS1.1";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_TLSv1_2:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.0:+VERS-TLS1.1:+VERS-TLS1.2";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_TLSv1_1:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.1";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_TLSv1_2:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.1:+VERS-TLS1.2";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_2 | CURL_SSLVERSION_MAX_TLSv1_2:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.2";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_3 | CURL_SSLVERSION_MAX_TLSv1_3:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.3";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_DEFAULT:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.0:+VERS-TLS1.1:+VERS-TLS1.2"
":+VERS-TLS1.3";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_DEFAULT:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.1:+VERS-TLS1.2"
":+VERS-TLS1.3";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_2 | CURL_SSLVERSION_MAX_DEFAULT:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.2"
":+VERS-TLS1.3";
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_3 | CURL_SSLVERSION_MAX_DEFAULT:
*prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.2"
":+VERS-TLS1.3";
return CURLE_OK;
}
failf(data, "GnuTLS: cannot set ssl protocol");
return CURLE_SSL_CONNECT_ERROR;
}
static CURLcode
gtls_connect_step1(struct connectdata *conn,
int sockindex)
{
struct Curl_easy *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct ssl_backend_data *backend = connssl->backend;
unsigned int init_flags;
gnutls_session_t session;
int rc;
bool sni = TRUE; /* default is SNI enabled */
void *transport_ptr = NULL;
gnutls_push_func gnutls_transport_push = NULL;
gnutls_pull_func gnutls_transport_pull = NULL;
#ifdef ENABLE_IPV6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
const char *prioritylist;
const char *err = NULL;
const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
conn->host.name;
long * const certverifyresult = SSL_IS_PROXY() ?
&data->set.proxy_ssl.certverifyresult : &data->set.ssl.certverifyresult;
if(connssl->state == ssl_connection_complete)
/* to make us tolerant against being called more than once for the
same connection */
return CURLE_OK;
if(!gtls_inited)
Curl_gtls_init();
/* Initialize certverifyresult to OK */
*certverifyresult = 0;
if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv2) {
failf(data, "GnuTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
}
else if(SSL_CONN_CONFIG(version) == CURL_SSLVERSION_SSLv3)
sni = FALSE; /* SSLv3 has no SNI */
/* allocate a cred struct */
rc = gnutls_certificate_allocate_credentials(&backend->cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef USE_TLS_SRP
if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP) {
infof(data, "Using TLS-SRP username: %s\n", SSL_SET_OPTION(username));
rc = gnutls_srp_allocate_client_credentials(
&backend->srp_client_cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_srp_allocate_client_cred() failed: %s",
gnutls_strerror(rc));
return CURLE_OUT_OF_MEMORY;
}
rc = gnutls_srp_set_client_credentials(backend->srp_client_cred,
SSL_SET_OPTION(username),
SSL_SET_OPTION(password));
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_srp_set_client_cred() failed: %s",
gnutls_strerror(rc));
return CURLE_BAD_FUNCTION_ARGUMENT;
}
}
#endif
if(SSL_CONN_CONFIG(CAfile)) {
/* set the trusted CA cert bundle file */
gnutls_certificate_set_verify_flags(backend->cred,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
rc = gnutls_certificate_set_x509_trust_file(backend->cred,
SSL_CONN_CONFIG(CAfile),
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
infof(data, "error reading ca cert file %s (%s)\n",
SSL_CONN_CONFIG(CAfile), gnutls_strerror(rc));
if(SSL_CONN_CONFIG(verifypeer)) {
*certverifyresult = rc;
return CURLE_SSL_CACERT_BADFILE;
}
}
else
infof(data, "found %d certificates in %s\n", rc,
SSL_CONN_CONFIG(CAfile));
}
if(SSL_CONN_CONFIG(CApath)) {
/* set the trusted CA cert directory */
rc = gnutls_certificate_set_x509_trust_dir(backend->cred,
SSL_CONN_CONFIG(CApath),
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
infof(data, "error reading ca cert file %s (%s)\n",
SSL_CONN_CONFIG(CApath), gnutls_strerror(rc));
if(SSL_CONN_CONFIG(verifypeer)) {
*certverifyresult = rc;
return CURLE_SSL_CACERT_BADFILE;
}
}
else
infof(data, "found %d certificates in %s\n",
rc, SSL_CONN_CONFIG(CApath));
}
#ifdef CURL_CA_FALLBACK
/* use system ca certificate store as fallback */
if(SSL_CONN_CONFIG(verifypeer) &&
!(SSL_CONN_CONFIG(CAfile) || SSL_CONN_CONFIG(CApath))) {
gnutls_certificate_set_x509_system_trust(backend->cred);
}
#endif
if(SSL_SET_OPTION(CRLfile)) {
/* set the CRL list file */
rc = gnutls_certificate_set_x509_crl_file(backend->cred,
SSL_SET_OPTION(CRLfile),
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
failf(data, "error reading crl file %s (%s)",
SSL_SET_OPTION(CRLfile), gnutls_strerror(rc));
return CURLE_SSL_CRL_BADFILE;
}
else
infof(data, "found %d CRL in %s\n",
rc, SSL_SET_OPTION(CRLfile));
}
/* Initialize TLS session as a client */
init_flags = GNUTLS_CLIENT;
#if defined(GNUTLS_FORCE_CLIENT_CERT)
init_flags |= GNUTLS_FORCE_CLIENT_CERT;
#endif
#if defined(GNUTLS_NO_TICKETS)
/* Disable TLS session tickets */
init_flags |= GNUTLS_NO_TICKETS;
#endif
rc = gnutls_init(&backend->session, init_flags);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_init() failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
/* convenient assign */
session = backend->session;
if((0 == Curl_inet_pton(AF_INET, hostname, &addr)) &&
#ifdef ENABLE_IPV6
(0 == Curl_inet_pton(AF_INET6, hostname, &addr)) &&
#endif
sni &&
(gnutls_server_name_set(session, GNUTLS_NAME_DNS, hostname,
strlen(hostname)) < 0))
infof(data, "WARNING: failed to configure server name indication (SNI) "
"TLS extension\n");
/* Use default priorities */
rc = gnutls_set_default_priority(session);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
/* Ensure +SRP comes at the *end* of all relevant strings so that it can be
* removed if a run-time error indicates that SRP is not supported by this
* GnuTLS version */
switch(SSL_CONN_CONFIG(version)) {
case CURL_SSLVERSION_SSLv3:
prioritylist = GNUTLS_CIPHERS ":-VERS-TLS-ALL:+VERS-SSL3.0";
break;
case CURL_SSLVERSION_DEFAULT:
case CURL_SSLVERSION_TLSv1:
prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0"
#ifdef HAS_TLS13
":+VERS-TLS1.3"
#endif
;
break;
case CURL_SSLVERSION_TLSv1_0:
case CURL_SSLVERSION_TLSv1_1:
case CURL_SSLVERSION_TLSv1_2:
case CURL_SSLVERSION_TLSv1_3:
{
CURLcode result = set_ssl_version_min_max(&prioritylist, conn);
if(result != CURLE_OK)
return result;
break;
}
case CURL_SSLVERSION_SSLv2:
failf(data, "GnuTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
default:
failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef USE_TLS_SRP
/* Only add SRP to the cipher list if SRP is requested. Otherwise
* GnuTLS will disable TLS 1.3 support. */
if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP) {
size_t len = strlen(prioritylist);
char *prioritysrp = malloc(len + sizeof(GNUTLS_SRP) + 1);
if(!prioritysrp)
return CURLE_OUT_OF_MEMORY;
strcpy(prioritysrp, prioritylist);
strcpy(prioritysrp + len, ":" GNUTLS_SRP);
rc = gnutls_priority_set_direct(session, prioritysrp, &err);
free(prioritysrp);
if((rc == GNUTLS_E_INVALID_REQUEST) && err) {
infof(data, "This GnuTLS does not support SRP\n");
}
}
else {
#endif
rc = gnutls_priority_set_direct(session, prioritylist, &err);
#ifdef USE_TLS_SRP
}
#endif
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "Error %d setting GnuTLS cipher list starting with %s",
rc, err);
return CURLE_SSL_CONNECT_ERROR;
}
if(conn->bits.tls_enable_alpn) {
int cur = 0;
gnutls_datum_t protocols[2];
#ifdef USE_NGHTTP2
if(data->set.httpversion >= CURL_HTTP_VERSION_2 &&
(!SSL_IS_PROXY() || !conn->bits.tunnel_proxy)) {
protocols[cur].data = (unsigned char *)NGHTTP2_PROTO_VERSION_ID;
protocols[cur].size = NGHTTP2_PROTO_VERSION_ID_LEN;
cur++;
infof(data, "ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID);
}
#endif
protocols[cur].data = (unsigned char *)ALPN_HTTP_1_1;
protocols[cur].size = ALPN_HTTP_1_1_LENGTH;
cur++;
infof(data, "ALPN, offering %s\n", ALPN_HTTP_1_1);
gnutls_alpn_set_protocols(session, protocols, cur, 0);
}
if(SSL_SET_OPTION(cert)) {
if(SSL_SET_OPTION(key_passwd)) {
const unsigned int supported_key_encryption_algorithms =
GNUTLS_PKCS_USE_PKCS12_3DES | GNUTLS_PKCS_USE_PKCS12_ARCFOUR |
GNUTLS_PKCS_USE_PKCS12_RC2_40 | GNUTLS_PKCS_USE_PBES2_3DES |
GNUTLS_PKCS_USE_PBES2_AES_128 | GNUTLS_PKCS_USE_PBES2_AES_192 |
GNUTLS_PKCS_USE_PBES2_AES_256;
rc = gnutls_certificate_set_x509_key_file2(
backend->cred,
SSL_SET_OPTION(cert),
SSL_SET_OPTION(key) ?
SSL_SET_OPTION(key) : SSL_SET_OPTION(cert),
do_file_type(SSL_SET_OPTION(cert_type)),
SSL_SET_OPTION(key_passwd),
supported_key_encryption_algorithms);
if(rc != GNUTLS_E_SUCCESS) {
failf(data,
"error reading X.509 potentially-encrypted key file: %s",
gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
}
else {
if(gnutls_certificate_set_x509_key_file(
backend->cred,
SSL_SET_OPTION(cert),
SSL_SET_OPTION(key) ?
SSL_SET_OPTION(key) : SSL_SET_OPTION(cert),
do_file_type(SSL_SET_OPTION(cert_type)) ) !=
GNUTLS_E_SUCCESS) {
failf(data, "error reading X.509 key or certificate file");
return CURLE_SSL_CONNECT_ERROR;
}
}
}
#ifdef USE_TLS_SRP
/* put the credentials to the current session */
if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP) {
rc = gnutls_credentials_set(session, GNUTLS_CRD_SRP,
backend->srp_client_cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
}
else
#endif
{
rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
backend->cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
}
if(conn->proxy_ssl[sockindex].use) {
transport_ptr = conn->proxy_ssl[sockindex].backend->session;
gnutls_transport_push = Curl_gtls_push_ssl;
gnutls_transport_pull = Curl_gtls_pull_ssl;
}
else {
/* file descriptor for the socket */
transport_ptr = &conn->sock[sockindex];
gnutls_transport_push = Curl_gtls_push;
gnutls_transport_pull = Curl_gtls_pull;
}
/* set the connection handle */
gnutls_transport_set_ptr(session, transport_ptr);
/* register callback functions to send and receive data. */
gnutls_transport_set_push_function(session, gnutls_transport_push);
gnutls_transport_set_pull_function(session, gnutls_transport_pull);
if(SSL_CONN_CONFIG(verifystatus)) {
rc = gnutls_ocsp_status_request_enable_client(session, NULL, 0, NULL);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_ocsp_status_request_enable_client() failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
}
/* This might be a reconnect, so we check for a session ID in the cache
to speed up things */
if(SSL_SET_OPTION(primary.sessionid)) {
void *ssl_sessionid;
size_t ssl_idsize;
Curl_ssl_sessionid_lock(conn);
if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize, sockindex)) {
/* we got a session id, use it! */
gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
/* Informational message */
infof(data, "SSL re-using session ID\n");
}
Curl_ssl_sessionid_unlock(conn);
}
return CURLE_OK;
}
static CURLcode pkp_pin_peer_pubkey(struct Curl_easy *data,
gnutls_x509_crt_t cert,
const char *pinnedpubkey)
{
/* Scratch */
size_t len1 = 0, len2 = 0;
unsigned char *buff1 = NULL;
gnutls_pubkey_t key = NULL;
/* Result is returned to caller */
CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;
/* if a path wasn't specified, don't pin */
if(NULL == pinnedpubkey)
return CURLE_OK;
if(NULL == cert)
return result;
do {
int ret;
/* Begin Gyrations to get the public key */
gnutls_pubkey_init(&key);
ret = gnutls_pubkey_import_x509(key, cert, 0);
if(ret < 0)
break; /* failed */
ret = gnutls_pubkey_export(key, GNUTLS_X509_FMT_DER, NULL, &len1);
if(ret != GNUTLS_E_SHORT_MEMORY_BUFFER || len1 == 0)
break; /* failed */
buff1 = malloc(len1);
if(NULL == buff1)
break; /* failed */
len2 = len1;
ret = gnutls_pubkey_export(key, GNUTLS_X509_FMT_DER, buff1, &len2);
if(ret < 0 || len1 != len2)
break; /* failed */
/* End Gyrations */
/* The one good exit point */
result = Curl_pin_peer_pubkey(data, pinnedpubkey, buff1, len1);
} while(0);
if(NULL != key)
gnutls_pubkey_deinit(key);
Curl_safefree(buff1);
return result;
}
static Curl_recv gtls_recv;
static Curl_send gtls_send;
static CURLcode
gtls_connect_step3(struct connectdata *conn,
int sockindex)
{
unsigned int cert_list_size;
const gnutls_datum_t *chainp;
unsigned int verify_status = 0;
gnutls_x509_crt_t x509_cert, x509_issuer;
gnutls_datum_t issuerp;
gnutls_datum_t certfields;
char certname[65] = ""; /* limited to 64 chars by ASN.1 */
size_t size;
time_t certclock;
const char *ptr;
struct Curl_easy *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct ssl_backend_data *backend = connssl->backend;
gnutls_session_t session = backend->session;
int rc;
gnutls_datum_t proto;
CURLcode result = CURLE_OK;
#ifndef CURL_DISABLE_VERBOSE_STRINGS
unsigned int algo;
unsigned int bits;
gnutls_protocol_t version = gnutls_protocol_get_version(session);
#endif
const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
conn->host.name;
long * const certverifyresult = SSL_IS_PROXY() ?
&data->set.proxy_ssl.certverifyresult : &data->set.ssl.certverifyresult;
/* the name of the cipher suite used, e.g. ECDHE_RSA_AES_256_GCM_SHA384. */
ptr = gnutls_cipher_suite_get_name(gnutls_kx_get(session),
gnutls_cipher_get(session),
gnutls_mac_get(session));
infof(data, "SSL connection using %s / %s\n",
gnutls_protocol_get_name(version), ptr);
/* This function will return the peer's raw certificate (chain) as sent by
the peer. These certificates are in raw format (DER encoded for
X.509). In case of a X.509 then a certificate list may be present. The
first certificate in the list is the peer's certificate, following the
issuer's certificate, then the issuer's issuer etc. */
chainp = gnutls_certificate_get_peers(session, &cert_list_size);
if(!chainp) {
if(SSL_CONN_CONFIG(verifypeer) ||
SSL_CONN_CONFIG(verifyhost) ||
SSL_SET_OPTION(issuercert)) {
#ifdef USE_TLS_SRP
if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP
&& SSL_SET_OPTION(username) != NULL
&& !SSL_CONN_CONFIG(verifypeer)
&& gnutls_cipher_get(session)) {
/* no peer cert, but auth is ok if we have SRP user and cipher and no
peer verify */
}
else {
#endif
failf(data, "failed to get server cert");
*certverifyresult = GNUTLS_E_NO_CERTIFICATE_FOUND;
return CURLE_PEER_FAILED_VERIFICATION;
#ifdef USE_TLS_SRP
}
#endif
}
infof(data, "\t common name: WARNING couldn't obtain\n");
}
if(data->set.ssl.certinfo && chainp) {
unsigned int i;
result = Curl_ssl_init_certinfo(data, cert_list_size);
if(result)
return result;
for(i = 0; i < cert_list_size; i++) {
const char *beg = (const char *) chainp[i].data;
const char *end = beg + chainp[i].size;
result = Curl_extract_certinfo(conn, i, beg, end);
if(result)
return result;
}
}
if(SSL_CONN_CONFIG(verifypeer)) {
/* This function will try to verify the peer's certificate and return its
status (trusted, invalid etc.). The value of status should be one or
more of the gnutls_certificate_status_t enumerated elements bitwise
or'd. To avoid denial of service attacks some default upper limits
regarding the certificate key size and chain size are set. To override
them use gnutls_certificate_set_verify_limits(). */
rc = gnutls_certificate_verify_peers2(session, &verify_status);
if(rc < 0) {
failf(data, "server cert verify failed: %d", rc);
*certverifyresult = rc;
return CURLE_SSL_CONNECT_ERROR;
}
*certverifyresult = verify_status;
/* verify_status is a bitmask of gnutls_certificate_status bits */
if(verify_status & GNUTLS_CERT_INVALID) {
if(SSL_CONN_CONFIG(verifypeer)) {
failf(data, "server certificate verification failed. CAfile: %s "
"CRLfile: %s", SSL_CONN_CONFIG(CAfile) ? SSL_CONN_CONFIG(CAfile):
"none",
SSL_SET_OPTION(CRLfile)?SSL_SET_OPTION(CRLfile):"none");
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t server certificate verification FAILED\n");
}
else
infof(data, "\t server certificate verification OK\n");
}
else
infof(data, "\t server certificate verification SKIPPED\n");
if(SSL_CONN_CONFIG(verifystatus)) {
if(gnutls_ocsp_status_request_is_checked(session, 0) == 0) {
gnutls_datum_t status_request;
gnutls_ocsp_resp_t ocsp_resp;
gnutls_ocsp_cert_status_t status;
gnutls_x509_crl_reason_t reason;
rc = gnutls_ocsp_status_request_get(session, &status_request);
infof(data, "\t server certificate status verification FAILED\n");
if(rc == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
failf(data, "No OCSP response received");
return CURLE_SSL_INVALIDCERTSTATUS;
}
if(rc < 0) {
failf(data, "Invalid OCSP response received");
return CURLE_SSL_INVALIDCERTSTATUS;
}
gnutls_ocsp_resp_init(&ocsp_resp);
rc = gnutls_ocsp_resp_import(ocsp_resp, &status_request);
if(rc < 0) {
failf(data, "Invalid OCSP response received");
return CURLE_SSL_INVALIDCERTSTATUS;
}
(void)gnutls_ocsp_resp_get_single(ocsp_resp, 0, NULL, NULL, NULL, NULL,
&status, NULL, NULL, NULL, &reason);
switch(status) {
case GNUTLS_OCSP_CERT_GOOD:
break;
case GNUTLS_OCSP_CERT_REVOKED: {
const char *crl_reason;
switch(reason) {
default:
case GNUTLS_X509_CRLREASON_UNSPECIFIED:
crl_reason = "unspecified reason";
break;
case GNUTLS_X509_CRLREASON_KEYCOMPROMISE:
crl_reason = "private key compromised";
break;
case GNUTLS_X509_CRLREASON_CACOMPROMISE:
crl_reason = "CA compromised";
break;
case GNUTLS_X509_CRLREASON_AFFILIATIONCHANGED:
crl_reason = "affiliation has changed";
break;
case GNUTLS_X509_CRLREASON_SUPERSEDED:
crl_reason = "certificate superseded";
break;
case GNUTLS_X509_CRLREASON_CESSATIONOFOPERATION:
crl_reason = "operation has ceased";
break;
case GNUTLS_X509_CRLREASON_CERTIFICATEHOLD:
crl_reason = "certificate is on hold";
break;
case GNUTLS_X509_CRLREASON_REMOVEFROMCRL:
crl_reason = "will be removed from delta CRL";
break;
case GNUTLS_X509_CRLREASON_PRIVILEGEWITHDRAWN:
crl_reason = "privilege withdrawn";
break;
case GNUTLS_X509_CRLREASON_AACOMPROMISE:
crl_reason = "AA compromised";
break;
}
failf(data, "Server certificate was revoked: %s", crl_reason);
break;
}
default:
case GNUTLS_OCSP_CERT_UNKNOWN:
failf(data, "Server certificate status is unknown");
break;
}
gnutls_ocsp_resp_deinit(ocsp_resp);
return CURLE_SSL_INVALIDCERTSTATUS;
}
else
infof(data, "\t server certificate status verification OK\n");
}
else
infof(data, "\t server certificate status verification SKIPPED\n");
/* initialize an X.509 certificate structure. */
gnutls_x509_crt_init(&x509_cert);
if(chainp)
/* convert the given DER or PEM encoded Certificate to the native
gnutls_x509_crt_t format */
gnutls_x509_crt_import(x509_cert, chainp, GNUTLS_X509_FMT_DER);
if(SSL_SET_OPTION(issuercert)) {
gnutls_x509_crt_init(&x509_issuer);
issuerp = load_file(SSL_SET_OPTION(issuercert));
gnutls_x509_crt_import(x509_issuer, &issuerp, GNUTLS_X509_FMT_PEM);
rc = gnutls_x509_crt_check_issuer(x509_cert, x509_issuer);
gnutls_x509_crt_deinit(x509_issuer);
unload_file(issuerp);
if(rc <= 0) {
failf(data, "server certificate issuer check failed (IssuerCert: %s)",
SSL_SET_OPTION(issuercert)?SSL_SET_OPTION(issuercert):"none");
gnutls_x509_crt_deinit(x509_cert);
return CURLE_SSL_ISSUER_ERROR;
}
infof(data, "\t server certificate issuer check OK (Issuer Cert: %s)\n",
SSL_SET_OPTION(issuercert)?SSL_SET_OPTION(issuercert):"none");
}
size = sizeof(certname);
rc = gnutls_x509_crt_get_dn_by_oid(x509_cert, GNUTLS_OID_X520_COMMON_NAME,
0, /* the first and only one */
FALSE,
certname,
&size);
if(rc) {
infof(data, "error fetching CN from cert:%s\n",
gnutls_strerror(rc));
}
/* This function will check if the given certificate's subject matches the
given hostname. This is a basic implementation of the matching described
in RFC2818 (HTTPS), which takes into account wildcards, and the subject
alternative name PKIX extension. Returns non zero on success, and zero on
failure. */
rc = gnutls_x509_crt_check_hostname(x509_cert, hostname);
#if GNUTLS_VERSION_NUMBER < 0x030306
/* Before 3.3.6, gnutls_x509_crt_check_hostname() didn't check IP
addresses. */
if(!rc) {
#ifdef ENABLE_IPV6
#define use_addr in6_addr
#else
#define use_addr in_addr
#endif
unsigned char addrbuf[sizeof(struct use_addr)];
size_t addrlen = 0;
if(Curl_inet_pton(AF_INET, hostname, addrbuf) > 0)
addrlen = 4;
#ifdef ENABLE_IPV6
else if(Curl_inet_pton(AF_INET6, hostname, addrbuf) > 0)
addrlen = 16;
#endif
if(addrlen) {
unsigned char certaddr[sizeof(struct use_addr)];
int i;
for(i = 0; ; i++) {
size_t certaddrlen = sizeof(certaddr);
int ret = gnutls_x509_crt_get_subject_alt_name(x509_cert, i, certaddr,
&certaddrlen, NULL);
/* If this happens, it wasn't an IP address. */
if(ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
continue;
if(ret < 0)
break;
if(ret != GNUTLS_SAN_IPADDRESS)
continue;
if(certaddrlen == addrlen && !memcmp(addrbuf, certaddr, addrlen)) {
rc = 1;
break;
}
}
}
}
#endif
if(!rc) {
const char * const dispname = SSL_IS_PROXY() ?
conn->http_proxy.host.dispname : conn->host.dispname;
if(SSL_CONN_CONFIG(verifyhost)) {
failf(data, "SSL: certificate subject name (%s) does not match "
"target host name '%s'", certname, dispname);
gnutls_x509_crt_deinit(x509_cert);
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t common name: %s (does not match '%s')\n",
certname, dispname);
}
else
infof(data, "\t common name: %s (matched)\n", certname);
/* Check for time-based validity */
certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
if(certclock == (time_t)-1) {
if(SSL_CONN_CONFIG(verifypeer)) {
failf(data, "server cert expiration date verify failed");
*certverifyresult = GNUTLS_CERT_EXPIRED;
gnutls_x509_crt_deinit(x509_cert);
return CURLE_SSL_CONNECT_ERROR;
}
else
infof(data, "\t server certificate expiration date verify FAILED\n");
}
else {
if(certclock < time(NULL)) {
if(SSL_CONN_CONFIG(verifypeer)) {
failf(data, "server certificate expiration date has passed.");
*certverifyresult = GNUTLS_CERT_EXPIRED;
gnutls_x509_crt_deinit(x509_cert);
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t server certificate expiration date FAILED\n");
}
else
infof(data, "\t server certificate expiration date OK\n");
}
certclock = gnutls_x509_crt_get_activation_time(x509_cert);
if(certclock == (time_t)-1) {
if(SSL_CONN_CONFIG(verifypeer)) {
failf(data, "server cert activation date verify failed");
*certverifyresult = GNUTLS_CERT_NOT_ACTIVATED;
gnutls_x509_crt_deinit(x509_cert);
return CURLE_SSL_CONNECT_ERROR;
}
else
infof(data, "\t server certificate activation date verify FAILED\n");
}
else {
if(certclock > time(NULL)) {
if(SSL_CONN_CONFIG(verifypeer)) {
failf(data, "server certificate not activated yet.");
*certverifyresult = GNUTLS_CERT_NOT_ACTIVATED;
gnutls_x509_crt_deinit(x509_cert);
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t server certificate activation date FAILED\n");
}
else
infof(data, "\t server certificate activation date OK\n");
}
ptr = SSL_IS_PROXY() ? data->set.str[STRING_SSL_PINNEDPUBLICKEY_PROXY] :
data->set.str[STRING_SSL_PINNEDPUBLICKEY_ORIG];
if(ptr) {
result = pkp_pin_peer_pubkey(data, x509_cert, ptr);
if(result != CURLE_OK) {
failf(data, "SSL: public key does not match pinned public key!");
gnutls_x509_crt_deinit(x509_cert);
return result;
}
}
/* Show:
- subject
- start date
- expire date
- common name
- issuer
*/
#ifndef CURL_DISABLE_VERBOSE_STRINGS
/* public key algorithm's parameters */
algo = gnutls_x509_crt_get_pk_algorithm(x509_cert, &bits);
infof(data, "\t certificate public key: %s\n",
gnutls_pk_algorithm_get_name(algo));
/* version of the X.509 certificate. */
infof(data, "\t certificate version: #%d\n",
gnutls_x509_crt_get_version(x509_cert));
rc = gnutls_x509_crt_get_dn2(x509_cert, &certfields);
if(rc != 0)
return CURLE_OUT_OF_MEMORY;
infof(data, "\t subject: %s\n", certfields.data);
certclock = gnutls_x509_crt_get_activation_time(x509_cert);
showtime(data, "start date", certclock);
certclock = gnutls_x509_crt_get_expiration_time(x509_cert);
showtime(data, "expire date", certclock);
rc = gnutls_x509_crt_get_issuer_dn2(x509_cert, &certfields);
if(rc != 0)
return CURLE_OUT_OF_MEMORY;
infof(data, "\t issuer: %s\n", certfields.data);
#endif
gnutls_x509_crt_deinit(x509_cert);
if(conn->bits.tls_enable_alpn) {
rc = gnutls_alpn_get_selected_protocol(session, &proto);
if(rc == 0) {
infof(data, "ALPN, server accepted to use %.*s\n", proto.size,
proto.data);
#ifdef USE_NGHTTP2
if(proto.size == NGHTTP2_PROTO_VERSION_ID_LEN &&
!memcmp(NGHTTP2_PROTO_VERSION_ID, proto.data,
NGHTTP2_PROTO_VERSION_ID_LEN)) {
conn->negnpn = CURL_HTTP_VERSION_2;
}
else
#endif
if(proto.size == ALPN_HTTP_1_1_LENGTH &&
!memcmp(ALPN_HTTP_1_1, proto.data, ALPN_HTTP_1_1_LENGTH)) {
conn->negnpn = CURL_HTTP_VERSION_1_1;
}
}
else
infof(data, "ALPN, server did not agree to a protocol\n");
Curl_multiuse_state(conn, conn->negnpn == CURL_HTTP_VERSION_2 ?
BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE);
}
conn->ssl[sockindex].state = ssl_connection_complete;
conn->recv[sockindex] = gtls_recv;
conn->send[sockindex] = gtls_send;
if(SSL_SET_OPTION(primary.sessionid)) {
/* we always unconditionally get the session id here, as even if we
already got it from the cache and asked to use it in the connection, it
might've been rejected and then a new one is in use now and we need to
detect that. */
void *connect_sessionid;
size_t connect_idsize = 0;
/* get the session ID data size */
gnutls_session_get_data(session, NULL, &connect_idsize);
connect_sessionid = malloc(connect_idsize); /* get a buffer for it */
if(connect_sessionid) {
bool incache;
void *ssl_sessionid;
/* extract session ID to the allocated buffer */
gnutls_session_get_data(session, connect_sessionid, &connect_idsize);
Curl_ssl_sessionid_lock(conn);
incache = !(Curl_ssl_getsessionid(conn, &ssl_sessionid, NULL,
sockindex));
if(incache) {
/* there was one before in the cache, so instead of risking that the
previous one was rejected, we just kill that and store the new */
Curl_ssl_delsessionid(conn, ssl_sessionid);
}
/* store this session id */
result = Curl_ssl_addsessionid(conn, connect_sessionid, connect_idsize,
sockindex);
Curl_ssl_sessionid_unlock(conn);
if(result) {
free(connect_sessionid);
result = CURLE_OUT_OF_MEMORY;
}
}
else
result = CURLE_OUT_OF_MEMORY;
}
return result;
}
/*
* This function is called after the TCP connect has completed. Setup the TLS
* layer and do all necessary magic.
*/
/* We use connssl->connecting_state to keep track of the connection status;
there are three states: 'ssl_connect_1' (not started yet or complete),
'ssl_connect_2_reading' (waiting for data from server), and
'ssl_connect_2_writing' (waiting to be able to write).
*/
static CURLcode
gtls_connect_common(struct connectdata *conn,
int sockindex,
bool nonblocking,
bool *done)
{
int rc;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
/* Initiate the connection, if not already done */
if(ssl_connect_1 == connssl->connecting_state) {
rc = gtls_connect_step1(conn, sockindex);
if(rc)
return rc;
}
rc = handshake(conn, sockindex, TRUE, nonblocking);
if(rc)
/* handshake() sets its own error message with failf() */
return rc;
/* Finish connecting once the handshake is done */
if(ssl_connect_1 == connssl->connecting_state) {
rc = gtls_connect_step3(conn, sockindex);
if(rc)
return rc;
}
*done = ssl_connect_1 == connssl->connecting_state;
return CURLE_OK;
}
static CURLcode Curl_gtls_connect_nonblocking(struct connectdata *conn,
int sockindex, bool *done)
{
return gtls_connect_common(conn, sockindex, TRUE, done);
}
static CURLcode Curl_gtls_connect(struct connectdata *conn, int sockindex)
{
CURLcode result;
bool done = FALSE;
result = gtls_connect_common(conn, sockindex, FALSE, &done);
if(result)
return result;
DEBUGASSERT(done);
return CURLE_OK;
}
static bool Curl_gtls_data_pending(const struct connectdata *conn,
int connindex)
{
const struct ssl_connect_data *connssl = &conn->ssl[connindex];
bool res = FALSE;
struct ssl_backend_data *backend = connssl->backend;
if(backend->session &&
0 != gnutls_record_check_pending(backend->session))
res = TRUE;
connssl = &conn->proxy_ssl[connindex];
if(backend->session &&
0 != gnutls_record_check_pending(backend->session))
res = TRUE;
return res;
}
static ssize_t gtls_send(struct connectdata *conn,
int sockindex,
const void *mem,
size_t len,
CURLcode *curlcode)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct ssl_backend_data *backend = connssl->backend;
ssize_t rc = gnutls_record_send(backend->session, mem, len);
if(rc < 0) {
*curlcode = (rc == GNUTLS_E_AGAIN)
? CURLE_AGAIN
: CURLE_SEND_ERROR;
rc = -1;
}
return rc;
}
static void close_one(struct ssl_connect_data *connssl)
{
struct ssl_backend_data *backend = connssl->backend;
if(backend->session) {
gnutls_bye(backend->session, GNUTLS_SHUT_WR);
gnutls_deinit(backend->session);
backend->session = NULL;
}
if(backend->cred) {
gnutls_certificate_free_credentials(backend->cred);
backend->cred = NULL;
}
#ifdef USE_TLS_SRP
if(backend->srp_client_cred) {
gnutls_srp_free_client_credentials(backend->srp_client_cred);
backend->srp_client_cred = NULL;
}
#endif
}
static void Curl_gtls_close(struct connectdata *conn, int sockindex)
{
close_one(&conn->ssl[sockindex]);
close_one(&conn->proxy_ssl[sockindex]);
}
/*
* This function is called to shut down the SSL layer but keep the
* socket open (CCC - Clear Command Channel)
*/
static int Curl_gtls_shutdown(struct connectdata *conn, int sockindex)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct ssl_backend_data *backend = connssl->backend;
int retval = 0;
struct Curl_easy *data = conn->data;
#ifndef CURL_DISABLE_FTP
/* This has only been tested on the proftpd server, and the mod_tls code
sends a close notify alert without waiting for a close notify alert in
response. Thus we wait for a close notify alert from the server, but
we do not send one. Let's hope other servers do the same... */
if(data->set.ftp_ccc == CURLFTPSSL_CCC_ACTIVE)
gnutls_bye(backend->session, GNUTLS_SHUT_WR);
#endif
if(backend->session) {
ssize_t result;
bool done = FALSE;
char buf[120];
while(!done) {
int what = SOCKET_READABLE(conn->sock[sockindex],
SSL_SHUTDOWN_TIMEOUT);
if(what > 0) {
/* Something to read, let's do it and hope that it is the close
notify alert from the server */
result = gnutls_record_recv(backend->session,
buf, sizeof(buf));
switch(result) {
case 0:
/* This is the expected response. There was no data but only
the close notify alert */
done = TRUE;
break;
case GNUTLS_E_AGAIN:
case GNUTLS_E_INTERRUPTED:
infof(data, "GNUTLS_E_AGAIN || GNUTLS_E_INTERRUPTED\n");
break;
default:
retval = -1;
done = TRUE;
break;
}
}
else if(0 == what) {
/* timeout */
failf(data, "SSL shutdown timeout");
done = TRUE;
}
else {
/* anything that gets here is fatally bad */
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
retval = -1;
done = TRUE;
}
}
gnutls_deinit(backend->session);
}
gnutls_certificate_free_credentials(backend->cred);
#ifdef USE_TLS_SRP
if(SSL_SET_OPTION(authtype) == CURL_TLSAUTH_SRP
&& SSL_SET_OPTION(username) != NULL)
gnutls_srp_free_client_credentials(backend->srp_client_cred);
#endif
backend->cred = NULL;
backend->session = NULL;
return retval;
}
static ssize_t gtls_recv(struct connectdata *conn, /* connection data */
int num, /* socketindex */
char *buf, /* store read data here */
size_t buffersize, /* max amount to read */
CURLcode *curlcode)
{
struct ssl_connect_data *connssl = &conn->ssl[num];
struct ssl_backend_data *backend = connssl->backend;
ssize_t ret;
ret = gnutls_record_recv(backend->session, buf, buffersize);
if((ret == GNUTLS_E_AGAIN) || (ret == GNUTLS_E_INTERRUPTED)) {
*curlcode = CURLE_AGAIN;
return -1;
}
if(ret == GNUTLS_E_REHANDSHAKE) {
/* BLOCKING call, this is bad but a work-around for now. Fixing this "the
proper way" takes a whole lot of work. */
CURLcode result = handshake(conn, num, FALSE, FALSE);
if(result)
/* handshake() writes error message on its own */
*curlcode = result;
else
*curlcode = CURLE_AGAIN; /* then return as if this was a wouldblock */
return -1;
}
if(ret < 0) {
failf(conn->data, "GnuTLS recv error (%d): %s",
(int)ret, gnutls_strerror((int)ret));
*curlcode = CURLE_RECV_ERROR;
return -1;
}
return ret;
}
static void Curl_gtls_session_free(void *ptr)
{
free(ptr);
}
static size_t Curl_gtls_version(char *buffer, size_t size)
{
return msnprintf(buffer, size, "GnuTLS/%s", gnutls_check_version(NULL));
}
#ifndef USE_GNUTLS_NETTLE
static int Curl_gtls_seed(struct Curl_easy *data)
{
/* we have the "SSL is seeded" boolean static to prevent multiple
time-consuming seedings in vain */
static bool ssl_seeded = FALSE;
/* Quickly add a bit of entropy */
gcry_fast_random_poll();
if(!ssl_seeded || data->set.str[STRING_SSL_RANDOM_FILE] ||
data->set.str[STRING_SSL_EGDSOCKET]) {
ssl_seeded = TRUE;
}
return 0;
}
#endif
/* data might be NULL! */
static CURLcode Curl_gtls_random(struct Curl_easy *data,
unsigned char *entropy, size_t length)
{
#if defined(USE_GNUTLS_NETTLE)
int rc;
(void)data;
rc = gnutls_rnd(GNUTLS_RND_RANDOM, entropy, length);
return rc?CURLE_FAILED_INIT:CURLE_OK;
#elif defined(USE_GNUTLS)
if(data)
Curl_gtls_seed(data); /* Initiate the seed if not already done */
gcry_randomize(entropy, length, GCRY_STRONG_RANDOM);
#endif
return CURLE_OK;
}
static CURLcode Curl_gtls_md5sum(unsigned char *tmp, /* input */
size_t tmplen,
unsigned char *md5sum, /* output */
size_t md5len)
{
#if defined(USE_GNUTLS_NETTLE)
struct md5_ctx MD5pw;
md5_init(&MD5pw);
md5_update(&MD5pw, (unsigned int)tmplen, tmp);
md5_digest(&MD5pw, (unsigned int)md5len, md5sum);
#elif defined(USE_GNUTLS)
gcry_md_hd_t MD5pw;
gcry_md_open(&MD5pw, GCRY_MD_MD5, 0);
gcry_md_write(MD5pw, tmp, tmplen);
memcpy(md5sum, gcry_md_read(MD5pw, 0), md5len);
gcry_md_close(MD5pw);
#endif
return CURLE_OK;
}
static CURLcode Curl_gtls_sha256sum(const unsigned char *tmp, /* input */
size_t tmplen,
unsigned char *sha256sum, /* output */
size_t sha256len)
{
#if defined(USE_GNUTLS_NETTLE)
struct sha256_ctx SHA256pw;
sha256_init(&SHA256pw);
sha256_update(&SHA256pw, (unsigned int)tmplen, tmp);
sha256_digest(&SHA256pw, (unsigned int)sha256len, sha256sum);
#elif defined(USE_GNUTLS)
gcry_md_hd_t SHA256pw;
gcry_md_open(&SHA256pw, GCRY_MD_SHA256, 0);
gcry_md_write(SHA256pw, tmp, tmplen);
memcpy(sha256sum, gcry_md_read(SHA256pw, 0), sha256len);
gcry_md_close(SHA256pw);
#endif
return CURLE_OK;
}
static bool Curl_gtls_cert_status_request(void)
{
return TRUE;
}
static void *Curl_gtls_get_internals(struct ssl_connect_data *connssl,
CURLINFO info UNUSED_PARAM)
{
struct ssl_backend_data *backend = connssl->backend;
(void)info;
return backend->session;
}
const struct Curl_ssl Curl_ssl_gnutls = {
{ CURLSSLBACKEND_GNUTLS, "gnutls" }, /* info */
SSLSUPP_CA_PATH |
SSLSUPP_CERTINFO |
SSLSUPP_PINNEDPUBKEY |
SSLSUPP_HTTPS_PROXY,
sizeof(struct ssl_backend_data),
Curl_gtls_init, /* init */
Curl_gtls_cleanup, /* cleanup */
Curl_gtls_version, /* version */
Curl_none_check_cxn, /* check_cxn */
Curl_gtls_shutdown, /* shutdown */
Curl_gtls_data_pending, /* data_pending */
Curl_gtls_random, /* random */
Curl_gtls_cert_status_request, /* cert_status_request */
Curl_gtls_connect, /* connect */
Curl_gtls_connect_nonblocking, /* connect_nonblocking */
Curl_gtls_get_internals, /* get_internals */
Curl_gtls_close, /* close_one */
Curl_none_close_all, /* close_all */
Curl_gtls_session_free, /* session_free */
Curl_none_set_engine, /* set_engine */
Curl_none_set_engine_default, /* set_engine_default */
Curl_none_engines_list, /* engines_list */
Curl_none_false_start, /* false_start */
Curl_gtls_md5sum, /* md5sum */
Curl_gtls_sha256sum /* sha256sum */
};
#endif /* USE_GNUTLS */
|