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 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416
|
/*
* validator/autotrust.c - RFC5011 trust anchor management for unbound.
*
* Copyright (c) 2009, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* Contains autotrust implementation. The implementation was taken from
* the autotrust daemon (BSD licensed), written by Matthijs Mekking.
* It was modified to fit into unbound. The state table process is the same.
*/
#include "config.h"
#include "validator/autotrust.h"
#include "validator/val_anchor.h"
#include "validator/val_utils.h"
#include "validator/val_sigcrypt.h"
#include "util/data/dname.h"
#include "util/data/packed_rrset.h"
#include "util/log.h"
#include "util/module.h"
#include "util/net_help.h"
#include "util/config_file.h"
#include "util/regional.h"
#include "util/random.h"
#include "util/data/msgparse.h"
#include "services/mesh.h"
#include "services/cache/rrset.h"
#include "validator/val_kcache.h"
#include "sldns/sbuffer.h"
#include "sldns/wire2str.h"
#include "sldns/str2wire.h"
#include "sldns/keyraw.h"
#include "sldns/rrdef.h"
#include <stdarg.h>
#include <ctype.h>
/** number of times a key must be seen before it can become valid */
#define MIN_PENDINGCOUNT 2
/** Event: Revoked */
static void do_revoked(struct module_env* env, struct autr_ta* anchor, int* c);
struct autr_global_data* autr_global_create(void)
{
struct autr_global_data* global;
global = (struct autr_global_data*)malloc(sizeof(*global));
if(!global)
return NULL;
rbtree_init(&global->probe, &probetree_cmp);
return global;
}
void autr_global_delete(struct autr_global_data* global)
{
if(!global)
return;
/* elements deleted by parent */
memset(global, 0, sizeof(*global));
free(global);
}
int probetree_cmp(const void* x, const void* y)
{
struct trust_anchor* a = (struct trust_anchor*)x;
struct trust_anchor* b = (struct trust_anchor*)y;
log_assert(a->autr && b->autr);
if(a->autr->next_probe_time < b->autr->next_probe_time)
return -1;
if(a->autr->next_probe_time > b->autr->next_probe_time)
return 1;
/* time is equal, sort on trust point identity */
return anchor_cmp(x, y);
}
size_t
autr_get_num_anchors(struct val_anchors* anchors)
{
size_t res = 0;
if(!anchors)
return 0;
lock_basic_lock(&anchors->lock);
if(anchors->autr)
res = anchors->autr->probe.count;
lock_basic_unlock(&anchors->lock);
return res;
}
/** Position in string */
static int
position_in_string(char *str, const char* sub)
{
char* pos = strstr(str, sub);
if(pos)
return (int)(pos-str)+(int)strlen(sub);
return -1;
}
/** Debug routine to print pretty key information */
static void
verbose_key(struct autr_ta* ta, enum verbosity_value level,
const char* format, ...) ATTR_FORMAT(printf, 3, 4);
/**
* Implementation of debug pretty key print
* @param ta: trust anchor key with DNSKEY data.
* @param level: verbosity level to print at.
* @param format: printf style format string.
*/
static void
verbose_key(struct autr_ta* ta, enum verbosity_value level,
const char* format, ...)
{
va_list args;
va_start(args, format);
if(verbosity >= level) {
char* str = sldns_wire2str_dname(ta->rr, ta->dname_len);
int keytag = (int)sldns_calc_keytag_raw(sldns_wirerr_get_rdata(
ta->rr, ta->rr_len, ta->dname_len),
sldns_wirerr_get_rdatalen(ta->rr, ta->rr_len,
ta->dname_len));
char msg[MAXSYSLOGMSGLEN];
vsnprintf(msg, sizeof(msg), format, args);
verbose(level, "%s key %d %s", str?str:"??", keytag, msg);
free(str);
}
va_end(args);
}
/**
* Parse comments
* @param str: to parse
* @param ta: trust key autotrust metadata
* @return false on failure.
*/
static int
parse_comments(char* str, struct autr_ta* ta)
{
int len = (int)strlen(str), pos = 0, timestamp = 0;
char* comment = (char*) malloc(sizeof(char)*len+1);
char* comments = comment;
if(!comment) {
log_err("malloc failure in parse");
return 0;
}
/* skip over whitespace and data at start of line */
while (*str != '\0' && *str != ';')
str++;
if (*str == ';')
str++;
/* copy comments */
while (*str != '\0')
{
*comments = *str;
comments++;
str++;
}
*comments = '\0';
comments = comment;
/* read state */
pos = position_in_string(comments, "state=");
if (pos >= (int) strlen(comments))
{
log_err("parse error");
free(comment);
return 0;
}
if (pos <= 0)
ta->s = AUTR_STATE_VALID;
else
{
int s = (int) comments[pos] - '0';
switch(s)
{
case AUTR_STATE_START:
case AUTR_STATE_ADDPEND:
case AUTR_STATE_VALID:
case AUTR_STATE_MISSING:
case AUTR_STATE_REVOKED:
case AUTR_STATE_REMOVED:
ta->s = s;
break;
default:
verbose_key(ta, VERB_OPS, "has undefined "
"state, considered NewKey");
ta->s = AUTR_STATE_START;
break;
}
}
/* read pending count */
pos = position_in_string(comments, "count=");
if (pos >= (int) strlen(comments))
{
log_err("parse error");
free(comment);
return 0;
}
if (pos <= 0)
ta->pending_count = 0;
else
{
comments += pos;
ta->pending_count = (uint8_t)atoi(comments);
}
/* read last change */
pos = position_in_string(comments, "lastchange=");
if (pos >= (int) strlen(comments))
{
log_err("parse error");
free(comment);
return 0;
}
if (pos >= 0)
{
comments += pos;
timestamp = atoi(comments);
}
if (pos < 0 || !timestamp)
ta->last_change = 0;
else
ta->last_change = (time_t)timestamp;
free(comment);
return 1;
}
/** Check if a line contains data (besides comments) */
static int
str_contains_data(char* str, char comment)
{
while (*str != '\0') {
if (*str == comment || *str == '\n')
return 0;
if (*str != ' ' && *str != '\t')
return 1;
str++;
}
return 0;
}
/** Get DNSKEY flags
* rdata without rdatalen in front of it. */
static int
dnskey_flags(uint16_t t, uint8_t* rdata, size_t len)
{
uint16_t f;
if(t != LDNS_RR_TYPE_DNSKEY)
return 0;
if(len < 2)
return 0;
memmove(&f, rdata, 2);
f = ntohs(f);
return (int)f;
}
/** Check if KSK DNSKEY.
* pass rdata without rdatalen in front of it */
static int
rr_is_dnskey_sep(uint16_t t, uint8_t* rdata, size_t len)
{
return (dnskey_flags(t, rdata, len)&DNSKEY_BIT_SEP);
}
/** Check if TA is KSK DNSKEY */
static int
ta_is_dnskey_sep(struct autr_ta* ta)
{
return (dnskey_flags(
sldns_wirerr_get_type(ta->rr, ta->rr_len, ta->dname_len),
sldns_wirerr_get_rdata(ta->rr, ta->rr_len, ta->dname_len),
sldns_wirerr_get_rdatalen(ta->rr, ta->rr_len, ta->dname_len)
) & DNSKEY_BIT_SEP);
}
/** Check if REVOKED DNSKEY
* pass rdata without rdatalen in front of it */
static int
rr_is_dnskey_revoked(uint16_t t, uint8_t* rdata, size_t len)
{
return (dnskey_flags(t, rdata, len)&LDNS_KEY_REVOKE_KEY);
}
/** create ta */
static struct autr_ta*
autr_ta_create(uint8_t* rr, size_t rr_len, size_t dname_len)
{
struct autr_ta* ta = (struct autr_ta*)calloc(1, sizeof(*ta));
if(!ta) {
free(rr);
return NULL;
}
ta->rr = rr;
ta->rr_len = rr_len;
ta->dname_len = dname_len;
return ta;
}
/** create tp */
static struct trust_anchor*
autr_tp_create(struct val_anchors* anchors, uint8_t* own, size_t own_len,
uint16_t dc)
{
struct trust_anchor* tp = (struct trust_anchor*)calloc(1, sizeof(*tp));
if(!tp) return NULL;
tp->name = memdup(own, own_len);
if(!tp->name) {
free(tp);
return NULL;
}
tp->namelen = own_len;
tp->namelabs = dname_count_labels(tp->name);
tp->node.key = tp;
tp->dclass = dc;
tp->autr = (struct autr_point_data*)calloc(1, sizeof(*tp->autr));
if(!tp->autr) {
free(tp->name);
free(tp);
return NULL;
}
tp->autr->pnode.key = tp;
lock_basic_lock(&anchors->lock);
if(!rbtree_insert(anchors->tree, &tp->node)) {
lock_basic_unlock(&anchors->lock);
log_err("trust anchor presented twice");
free(tp->name);
free(tp->autr);
free(tp);
return NULL;
}
if(!rbtree_insert(&anchors->autr->probe, &tp->autr->pnode)) {
(void)rbtree_delete(anchors->tree, tp);
lock_basic_unlock(&anchors->lock);
log_err("trust anchor in probetree twice");
free(tp->name);
free(tp->autr);
free(tp);
return NULL;
}
lock_basic_unlock(&anchors->lock);
lock_basic_init(&tp->lock);
lock_protect(&tp->lock, tp, sizeof(*tp));
lock_protect(&tp->lock, tp->autr, sizeof(*tp->autr));
return tp;
}
/** delete assembled rrsets */
static void
autr_rrset_delete(struct ub_packed_rrset_key* r)
{
if(r) {
free(r->rk.dname);
free(r->entry.data);
free(r);
}
}
void autr_point_delete(struct trust_anchor* tp)
{
if(!tp)
return;
lock_unprotect(&tp->lock, tp);
lock_unprotect(&tp->lock, tp->autr);
lock_basic_destroy(&tp->lock);
autr_rrset_delete(tp->ds_rrset);
autr_rrset_delete(tp->dnskey_rrset);
if(tp->autr) {
struct autr_ta* p = tp->autr->keys, *np;
while(p) {
np = p->next;
free(p->rr);
free(p);
p = np;
}
free(tp->autr->file);
free(tp->autr);
}
free(tp->name);
free(tp);
}
/** find or add a new trust point for autotrust */
static struct trust_anchor*
find_add_tp(struct val_anchors* anchors, uint8_t* rr, size_t rr_len,
size_t dname_len)
{
struct trust_anchor* tp;
tp = anchor_find(anchors, rr, dname_count_labels(rr), dname_len,
sldns_wirerr_get_class(rr, rr_len, dname_len));
if(tp) {
if(!tp->autr) {
log_err("anchor cannot be with and without autotrust");
lock_basic_unlock(&tp->lock);
return NULL;
}
return tp;
}
tp = autr_tp_create(anchors, rr, dname_len, sldns_wirerr_get_class(rr,
rr_len, dname_len));
if(!tp)
return NULL;
lock_basic_lock(&tp->lock);
return tp;
}
/** Add trust anchor from RR */
static struct autr_ta*
add_trustanchor_frm_rr(struct val_anchors* anchors, uint8_t* rr, size_t rr_len,
size_t dname_len, struct trust_anchor** tp)
{
struct autr_ta* ta = autr_ta_create(rr, rr_len, dname_len);
if(!ta)
return NULL;
*tp = find_add_tp(anchors, rr, rr_len, dname_len);
if(!*tp) {
free(ta->rr);
free(ta);
return NULL;
}
/* add ta to tp */
ta->next = (*tp)->autr->keys;
(*tp)->autr->keys = ta;
lock_basic_unlock(&(*tp)->lock);
return ta;
}
/**
* Add new trust anchor from a string in file.
* @param anchors: all anchors
* @param str: string with anchor and comments, if any comments.
* @param tp: trust point returned.
* @param origin: what to use for @
* @param origin_len: length of origin
* @param prev: previous rr name
* @param prev_len: length of prev
* @param skip: if true, the result is NULL, but not an error, skip it.
* @return new key in trust point.
*/
static struct autr_ta*
add_trustanchor_frm_str(struct val_anchors* anchors, char* str,
struct trust_anchor** tp, uint8_t* origin, size_t origin_len,
uint8_t** prev, size_t* prev_len, int* skip)
{
uint8_t rr[LDNS_RR_BUF_SIZE];
size_t rr_len = sizeof(rr), dname_len;
uint8_t* drr;
int lstatus;
if (!str_contains_data(str, ';')) {
*skip = 1;
return NULL; /* empty line */
}
if(0 != (lstatus = sldns_str2wire_rr_buf(str, rr, &rr_len, &dname_len,
0, origin, origin_len, *prev, *prev_len)))
{
log_err("ldns error while converting string to RR at%d: %s: %s",
LDNS_WIREPARSE_OFFSET(lstatus),
sldns_get_errorstr_parse(lstatus), str);
return NULL;
}
free(*prev);
*prev = memdup(rr, dname_len);
*prev_len = dname_len;
if(!*prev) {
log_err("malloc failure in add_trustanchor");
return NULL;
}
if(sldns_wirerr_get_type(rr, rr_len, dname_len)!=LDNS_RR_TYPE_DNSKEY &&
sldns_wirerr_get_type(rr, rr_len, dname_len)!=LDNS_RR_TYPE_DS) {
*skip = 1;
return NULL; /* only DS and DNSKEY allowed */
}
drr = memdup(rr, rr_len);
if(!drr) {
log_err("malloc failure in add trustanchor");
return NULL;
}
return add_trustanchor_frm_rr(anchors, drr, rr_len, dname_len, tp);
}
/**
* Load single anchor
* @param anchors: all points.
* @param str: comments line
* @param fname: filename
* @param origin: the $ORIGIN.
* @param origin_len: length of origin
* @param prev: passed to ldns.
* @param prev_len: length of prev
* @param skip: if true, the result is NULL, but not an error, skip it.
* @return false on failure, otherwise the tp read.
*/
static struct trust_anchor*
load_trustanchor(struct val_anchors* anchors, char* str, const char* fname,
uint8_t* origin, size_t origin_len, uint8_t** prev, size_t* prev_len,
int* skip)
{
struct autr_ta* ta = NULL;
struct trust_anchor* tp = NULL;
ta = add_trustanchor_frm_str(anchors, str, &tp, origin, origin_len,
prev, prev_len, skip);
if(!ta)
return NULL;
lock_basic_lock(&tp->lock);
if(!parse_comments(str, ta)) {
lock_basic_unlock(&tp->lock);
return NULL;
}
if(!tp->autr->file) {
tp->autr->file = strdup(fname);
if(!tp->autr->file) {
lock_basic_unlock(&tp->lock);
log_err("malloc failure");
return NULL;
}
}
lock_basic_unlock(&tp->lock);
return tp;
}
/** iterator for DSes from keylist. return true if a next element exists */
static int
assemble_iterate_ds(struct autr_ta** list, uint8_t** rr, size_t* rr_len,
size_t* dname_len)
{
while(*list) {
if(sldns_wirerr_get_type((*list)->rr, (*list)->rr_len,
(*list)->dname_len) == LDNS_RR_TYPE_DS) {
*rr = (*list)->rr;
*rr_len = (*list)->rr_len;
*dname_len = (*list)->dname_len;
*list = (*list)->next;
return 1;
}
*list = (*list)->next;
}
return 0;
}
/** iterator for DNSKEYs from keylist. return true if a next element exists */
static int
assemble_iterate_dnskey(struct autr_ta** list, uint8_t** rr, size_t* rr_len,
size_t* dname_len)
{
while(*list) {
if(sldns_wirerr_get_type((*list)->rr, (*list)->rr_len,
(*list)->dname_len) != LDNS_RR_TYPE_DS &&
((*list)->s == AUTR_STATE_VALID ||
(*list)->s == AUTR_STATE_MISSING)) {
*rr = (*list)->rr;
*rr_len = (*list)->rr_len;
*dname_len = (*list)->dname_len;
*list = (*list)->next;
return 1;
}
*list = (*list)->next;
}
return 0;
}
/** see if iterator-list has any elements in it, or it is empty */
static int
assemble_iterate_hasfirst(int iter(struct autr_ta**, uint8_t**, size_t*,
size_t*), struct autr_ta* list)
{
uint8_t* rr = NULL;
size_t rr_len = 0, dname_len = 0;
return iter(&list, &rr, &rr_len, &dname_len);
}
/** number of elements in iterator list */
static size_t
assemble_iterate_count(int iter(struct autr_ta**, uint8_t**, size_t*,
size_t*), struct autr_ta* list)
{
uint8_t* rr = NULL;
size_t i = 0, rr_len = 0, dname_len = 0;
while(iter(&list, &rr, &rr_len, &dname_len)) {
i++;
}
return i;
}
/**
* Create a ub_packed_rrset_key allocated on the heap.
* It therefore does not have the correct ID value, and cannot be used
* inside the cache. It can be used in storage outside of the cache.
* Keys for the cache have to be obtained from alloc.h .
* @param iter: iterator over the elements in the list. It filters elements.
* @param list: the list.
* @return key allocated or NULL on failure.
*/
static struct ub_packed_rrset_key*
ub_packed_rrset_heap_key(int iter(struct autr_ta**, uint8_t**, size_t*,
size_t*), struct autr_ta* list)
{
uint8_t* rr = NULL;
size_t rr_len = 0, dname_len = 0;
struct ub_packed_rrset_key* k;
if(!iter(&list, &rr, &rr_len, &dname_len))
return NULL;
k = (struct ub_packed_rrset_key*)calloc(1, sizeof(*k));
if(!k)
return NULL;
k->rk.type = htons(sldns_wirerr_get_type(rr, rr_len, dname_len));
k->rk.rrset_class = htons(sldns_wirerr_get_class(rr, rr_len, dname_len));
k->rk.dname_len = dname_len;
k->rk.dname = memdup(rr, dname_len);
if(!k->rk.dname) {
free(k);
return NULL;
}
return k;
}
/**
* Create packed_rrset data on the heap.
* @param iter: iterator over the elements in the list. It filters elements.
* @param list: the list.
* @return data allocated or NULL on failure.
*/
static struct packed_rrset_data*
packed_rrset_heap_data(int iter(struct autr_ta**, uint8_t**, size_t*,
size_t*), struct autr_ta* list)
{
uint8_t* rr = NULL;
size_t rr_len = 0, dname_len = 0;
struct packed_rrset_data* data;
size_t count=0, rrsig_count=0, len=0, i, total;
uint8_t* nextrdata;
struct autr_ta* list_i;
time_t ttl = 0;
list_i = list;
while(iter(&list_i, &rr, &rr_len, &dname_len)) {
if(sldns_wirerr_get_type(rr, rr_len, dname_len) ==
LDNS_RR_TYPE_RRSIG)
rrsig_count++;
else count++;
/* sizeof the rdlength + rdatalen */
len += 2 + sldns_wirerr_get_rdatalen(rr, rr_len, dname_len);
ttl = (time_t)sldns_wirerr_get_ttl(rr, rr_len, dname_len);
}
if(count == 0 && rrsig_count == 0)
return NULL;
/* allocate */
total = count + rrsig_count;
len += sizeof(*data) + total*(sizeof(size_t) + sizeof(time_t) +
sizeof(uint8_t*));
data = (struct packed_rrset_data*)calloc(1, len);
if(!data)
return NULL;
/* fill it */
data->ttl = ttl;
data->count = count;
data->rrsig_count = rrsig_count;
data->rr_len = (size_t*)((uint8_t*)data +
sizeof(struct packed_rrset_data));
data->rr_data = (uint8_t**)&(data->rr_len[total]);
data->rr_ttl = (time_t*)&(data->rr_data[total]);
nextrdata = (uint8_t*)&(data->rr_ttl[total]);
/* fill out len, ttl, fields */
list_i = list;
i = 0;
while(iter(&list_i, &rr, &rr_len, &dname_len)) {
data->rr_ttl[i] = (time_t)sldns_wirerr_get_ttl(rr, rr_len,
dname_len);
if(data->rr_ttl[i] < data->ttl)
data->ttl = data->rr_ttl[i];
data->rr_len[i] = 2 /* the rdlength */ +
sldns_wirerr_get_rdatalen(rr, rr_len, dname_len);
i++;
}
/* fixup rest of ptrs */
for(i=0; i<total; i++) {
data->rr_data[i] = nextrdata;
nextrdata += data->rr_len[i];
}
/* copy data in there */
list_i = list;
i = 0;
while(iter(&list_i, &rr, &rr_len, &dname_len)) {
memmove(data->rr_data[i],
sldns_wirerr_get_rdatawl(rr, rr_len, dname_len),
data->rr_len[i]);
i++;
}
if(data->rrsig_count && data->count == 0) {
data->count = data->rrsig_count; /* rrset type is RRSIG */
data->rrsig_count = 0;
}
return data;
}
/**
* Assemble the trust anchors into DS and DNSKEY packed rrsets.
* Uses only VALID and MISSING DNSKEYs.
* Read the sldns_rrs and builds packed rrsets
* @param tp: the trust point. Must be locked.
* @return false on malloc failure.
*/
static int
autr_assemble(struct trust_anchor* tp)
{
struct ub_packed_rrset_key* ubds=NULL, *ubdnskey=NULL;
/* make packed rrset keys - malloced with no ID number, they
* are not in the cache */
/* make packed rrset data (if there is a key) */
if(assemble_iterate_hasfirst(assemble_iterate_ds, tp->autr->keys)) {
ubds = ub_packed_rrset_heap_key(
assemble_iterate_ds, tp->autr->keys);
if(!ubds)
goto error_cleanup;
ubds->entry.data = packed_rrset_heap_data(
assemble_iterate_ds, tp->autr->keys);
if(!ubds->entry.data)
goto error_cleanup;
}
/* make packed DNSKEY data */
if(assemble_iterate_hasfirst(assemble_iterate_dnskey, tp->autr->keys)) {
ubdnskey = ub_packed_rrset_heap_key(
assemble_iterate_dnskey, tp->autr->keys);
if(!ubdnskey)
goto error_cleanup;
ubdnskey->entry.data = packed_rrset_heap_data(
assemble_iterate_dnskey, tp->autr->keys);
if(!ubdnskey->entry.data) {
error_cleanup:
autr_rrset_delete(ubds);
autr_rrset_delete(ubdnskey);
return 0;
}
}
/* we have prepared the new keys so nothing can go wrong any more.
* And we are sure we cannot be left without trustanchor after
* any errors. Put in the new keys and remove old ones. */
/* free the old data */
autr_rrset_delete(tp->ds_rrset);
autr_rrset_delete(tp->dnskey_rrset);
/* assign the data to replace the old */
tp->ds_rrset = ubds;
tp->dnskey_rrset = ubdnskey;
tp->numDS = assemble_iterate_count(assemble_iterate_ds,
tp->autr->keys);
tp->numDNSKEY = assemble_iterate_count(assemble_iterate_dnskey,
tp->autr->keys);
return 1;
}
/** parse integer */
static unsigned int
parse_int(char* line, int* ret)
{
char *e;
unsigned int x = (unsigned int)strtol(line, &e, 10);
if(line == e) {
*ret = -1; /* parse error */
return 0;
}
*ret = 1; /* matched */
return x;
}
/** parse id sequence for anchor */
static struct trust_anchor*
parse_id(struct val_anchors* anchors, char* line)
{
struct trust_anchor *tp;
int r;
uint16_t dclass;
uint8_t* dname;
size_t dname_len;
/* read the owner name */
char* next = strchr(line, ' ');
if(!next)
return NULL;
next[0] = 0;
dname = sldns_str2wire_dname(line, &dname_len);
if(!dname)
return NULL;
/* read the class */
dclass = parse_int(next+1, &r);
if(r == -1) {
free(dname);
return NULL;
}
/* find the trust point */
tp = autr_tp_create(anchors, dname, dname_len, dclass);
free(dname);
return tp;
}
/**
* Parse variable from trustanchor header
* @param line: to parse
* @param anchors: the anchor is added to this, if "id:" is seen.
* @param anchor: the anchor as result value or previously returned anchor
* value to read the variable lines into.
* @return: 0 no match, -1 failed syntax error, +1 success line read.
* +2 revoked trust anchor file.
*/
static int
parse_var_line(char* line, struct val_anchors* anchors,
struct trust_anchor** anchor)
{
struct trust_anchor* tp = *anchor;
int r = 0;
if(strncmp(line, ";;id: ", 6) == 0) {
*anchor = parse_id(anchors, line+6);
if(!*anchor) return -1;
else return 1;
} else if(strncmp(line, ";;REVOKED", 9) == 0) {
if(tp) {
log_err("REVOKED statement must be at start of file");
return -1;
}
return 2;
} else if(strncmp(line, ";;last_queried: ", 16) == 0) {
if(!tp) return -1;
lock_basic_lock(&tp->lock);
tp->autr->last_queried = (time_t)parse_int(line+16, &r);
lock_basic_unlock(&tp->lock);
} else if(strncmp(line, ";;last_success: ", 16) == 0) {
if(!tp) return -1;
lock_basic_lock(&tp->lock);
tp->autr->last_success = (time_t)parse_int(line+16, &r);
lock_basic_unlock(&tp->lock);
} else if(strncmp(line, ";;next_probe_time: ", 19) == 0) {
if(!tp) return -1;
lock_basic_lock(&anchors->lock);
lock_basic_lock(&tp->lock);
(void)rbtree_delete(&anchors->autr->probe, tp);
tp->autr->next_probe_time = (time_t)parse_int(line+19, &r);
(void)rbtree_insert(&anchors->autr->probe, &tp->autr->pnode);
lock_basic_unlock(&tp->lock);
lock_basic_unlock(&anchors->lock);
} else if(strncmp(line, ";;query_failed: ", 16) == 0) {
if(!tp) return -1;
lock_basic_lock(&tp->lock);
tp->autr->query_failed = (uint8_t)parse_int(line+16, &r);
lock_basic_unlock(&tp->lock);
} else if(strncmp(line, ";;query_interval: ", 18) == 0) {
if(!tp) return -1;
lock_basic_lock(&tp->lock);
tp->autr->query_interval = (time_t)parse_int(line+18, &r);
lock_basic_unlock(&tp->lock);
} else if(strncmp(line, ";;retry_time: ", 14) == 0) {
if(!tp) return -1;
lock_basic_lock(&tp->lock);
tp->autr->retry_time = (time_t)parse_int(line+14, &r);
lock_basic_unlock(&tp->lock);
}
return r;
}
/** handle origin lines */
static int
handle_origin(char* line, uint8_t** origin, size_t* origin_len)
{
size_t len = 0;
while(isspace((unsigned char)*line))
line++;
if(strncmp(line, "$ORIGIN", 7) != 0)
return 0;
free(*origin);
line += 7;
while(isspace((unsigned char)*line))
line++;
*origin = sldns_str2wire_dname(line, &len);
*origin_len = len;
if(!*origin)
log_warn("malloc failure or parse error in $ORIGIN");
return 1;
}
/** Read one line and put multiline RRs onto one line string */
static int
read_multiline(char* buf, size_t len, FILE* in, int* linenr)
{
char* pos = buf;
size_t left = len;
int depth = 0;
buf[len-1] = 0;
while(left > 0 && fgets(pos, (int)left, in) != NULL) {
size_t i, poslen = strlen(pos);
(*linenr)++;
/* check what the new depth is after the line */
/* this routine cannot handle braces inside quotes,
say for TXT records, but this routine only has to read keys */
for(i=0; i<poslen; i++) {
if(pos[i] == '(') {
depth++;
} else if(pos[i] == ')') {
if(depth == 0) {
log_err("mismatch: too many ')'");
return -1;
}
depth--;
} else if(pos[i] == ';') {
break;
}
}
/* normal oneline or last line: keeps newline and comments */
if(depth == 0) {
return 1;
}
/* more lines expected, snip off comments and newline */
if(poslen>0)
pos[poslen-1] = 0; /* strip newline */
if(strchr(pos, ';'))
strchr(pos, ';')[0] = 0; /* strip comments */
/* move to paste other lines behind this one */
poslen = strlen(pos);
pos += poslen;
left -= poslen;
/* the newline is changed into a space */
if(left <= 2 /* space and eos */) {
log_err("line too long");
return -1;
}
pos[0] = ' ';
pos[1] = 0;
pos += 1;
left -= 1;
}
if(depth != 0) {
log_err("mismatch: too many '('");
return -1;
}
if(pos != buf)
return 1;
return 0;
}
int autr_read_file(struct val_anchors* anchors, const char* nm)
{
/* the file descriptor */
FILE* fd;
/* keep track of line numbers */
int line_nr = 0;
/* single line */
char line[10240];
/* trust point being read */
struct trust_anchor *tp = NULL, *tp2;
int r;
/* for $ORIGIN parsing */
uint8_t *origin=NULL, *prev=NULL;
size_t origin_len=0, prev_len=0;
if (!(fd = fopen(nm, "r"))) {
log_err("unable to open %s for reading: %s",
nm, strerror(errno));
return 0;
}
verbose(VERB_ALGO, "reading autotrust anchor file %s", nm);
while ( (r=read_multiline(line, sizeof(line), fd, &line_nr)) != 0) {
if(r == -1 || (r = parse_var_line(line, anchors, &tp)) == -1) {
log_err("could not parse auto-trust-anchor-file "
"%s line %d", nm, line_nr);
fclose(fd);
free(origin);
free(prev);
return 0;
} else if(r == 1) {
continue;
} else if(r == 2) {
log_warn("trust anchor %s has been revoked", nm);
fclose(fd);
free(origin);
free(prev);
return 1;
}
if (!str_contains_data(line, ';'))
continue; /* empty lines allowed */
if(handle_origin(line, &origin, &origin_len))
continue;
r = 0;
if(!(tp2=load_trustanchor(anchors, line, nm, origin,
origin_len, &prev, &prev_len, &r))) {
if(!r) log_err("failed to load trust anchor from %s "
"at line %i, skipping", nm, line_nr);
/* try to do the rest */
continue;
}
if(tp && tp != tp2) {
log_err("file %s has mismatching data inside: "
"the file may only contain keys for one name, "
"remove keys for other domain names", nm);
fclose(fd);
free(origin);
free(prev);
return 0;
}
tp = tp2;
}
fclose(fd);
free(origin);
free(prev);
if(!tp) {
log_err("failed to read %s", nm);
return 0;
}
/* now assemble the data into DNSKEY and DS packed rrsets */
lock_basic_lock(&tp->lock);
if(!autr_assemble(tp)) {
lock_basic_unlock(&tp->lock);
log_err("malloc failure assembling %s", nm);
return 0;
}
lock_basic_unlock(&tp->lock);
return 1;
}
/** string for a trustanchor state */
static const char*
trustanchor_state2str(autr_state_t s)
{
switch (s) {
case AUTR_STATE_START: return " START ";
case AUTR_STATE_ADDPEND: return " ADDPEND ";
case AUTR_STATE_VALID: return " VALID ";
case AUTR_STATE_MISSING: return " MISSING ";
case AUTR_STATE_REVOKED: return " REVOKED ";
case AUTR_STATE_REMOVED: return " REMOVED ";
}
return " UNKNOWN ";
}
/** print ID to file */
static int
print_id(FILE* out, char* fname, uint8_t* nm, size_t nmlen, uint16_t dclass)
{
char* s = sldns_wire2str_dname(nm, nmlen);
if(!s) {
log_err("malloc failure in write to %s", fname);
return 0;
}
if(fprintf(out, ";;id: %s %d\n", s, (int)dclass) < 0) {
log_err("could not write to %s: %s", fname, strerror(errno));
free(s);
return 0;
}
free(s);
return 1;
}
static int
autr_write_contents(FILE* out, char* fn, struct trust_anchor* tp)
{
char tmi[32];
struct autr_ta* ta;
char* str;
/* write pretty header */
if(fprintf(out, "; autotrust trust anchor file\n") < 0) {
log_err("could not write to %s: %s", fn, strerror(errno));
return 0;
}
if(tp->autr->revoked) {
if(fprintf(out, ";;REVOKED\n") < 0 ||
fprintf(out, "; The zone has all keys revoked, and is\n"
"; considered as if it has no trust anchors.\n"
"; the remainder of the file is the last probe.\n"
"; to restart the trust anchor, overwrite this file.\n"
"; with one containing valid DNSKEYs or DSes.\n") < 0) {
log_err("could not write to %s: %s", fn, strerror(errno));
return 0;
}
}
if(!print_id(out, fn, tp->name, tp->namelen, tp->dclass)) {
return 0;
}
if(fprintf(out, ";;last_queried: %u ;;%s",
(unsigned int)tp->autr->last_queried,
ctime_r(&(tp->autr->last_queried), tmi)) < 0 ||
fprintf(out, ";;last_success: %u ;;%s",
(unsigned int)tp->autr->last_success,
ctime_r(&(tp->autr->last_success), tmi)) < 0 ||
fprintf(out, ";;next_probe_time: %u ;;%s",
(unsigned int)tp->autr->next_probe_time,
ctime_r(&(tp->autr->next_probe_time), tmi)) < 0 ||
fprintf(out, ";;query_failed: %d\n", (int)tp->autr->query_failed)<0
|| fprintf(out, ";;query_interval: %d\n",
(int)tp->autr->query_interval) < 0 ||
fprintf(out, ";;retry_time: %d\n", (int)tp->autr->retry_time) < 0) {
log_err("could not write to %s: %s", fn, strerror(errno));
return 0;
}
/* write anchors */
for(ta=tp->autr->keys; ta; ta=ta->next) {
/* by default do not store START and REMOVED keys */
if(ta->s == AUTR_STATE_START)
continue;
if(ta->s == AUTR_STATE_REMOVED)
continue;
/* only store keys */
if(sldns_wirerr_get_type(ta->rr, ta->rr_len, ta->dname_len)
!= LDNS_RR_TYPE_DNSKEY)
continue;
str = sldns_wire2str_rr(ta->rr, ta->rr_len);
if(!str || !str[0]) {
free(str);
log_err("malloc failure writing %s", fn);
return 0;
}
str[strlen(str)-1] = 0; /* remove newline */
if(fprintf(out, "%s ;;state=%d [%s] ;;count=%d "
";;lastchange=%u ;;%s", str, (int)ta->s,
trustanchor_state2str(ta->s), (int)ta->pending_count,
(unsigned int)ta->last_change,
ctime_r(&(ta->last_change), tmi)) < 0) {
log_err("could not write to %s: %s", fn, strerror(errno));
free(str);
return 0;
}
free(str);
}
return 1;
}
void autr_write_file(struct module_env* env, struct trust_anchor* tp)
{
FILE* out;
char* fname = tp->autr->file;
char tempf[2048];
log_assert(tp->autr);
if(!env) {
log_err("autr_write_file: Module environment is NULL.");
return;
}
/* unique name with pid number and thread number */
snprintf(tempf, sizeof(tempf), "%s.%d-%d", fname, (int)getpid(),
env->worker?*(int*)env->worker:0);
verbose(VERB_ALGO, "autotrust: write to disk: %s", tempf);
out = fopen(tempf, "w");
if(!out) {
fatal_exit("could not open autotrust file for writing, %s: %s",
tempf, strerror(errno));
return;
}
if(!autr_write_contents(out, tempf, tp)) {
/* failed to write contents (completely) */
fclose(out);
unlink(tempf);
fatal_exit("could not completely write: %s", fname);
return;
}
if(fflush(out) != 0)
log_err("could not fflush(%s): %s", fname, strerror(errno));
#ifdef HAVE_FSYNC
if(fsync(fileno(out)) != 0)
log_err("could not fsync(%s): %s", fname, strerror(errno));
#else
FlushFileBuffers((HANDLE)_get_osfhandle(_fileno(out)));
#endif
if(fclose(out) != 0) {
fatal_exit("could not complete write: %s: %s",
fname, strerror(errno));
unlink(tempf);
return;
}
/* success; overwrite actual file */
verbose(VERB_ALGO, "autotrust: replaced %s", fname);
#ifdef UB_ON_WINDOWS
(void)unlink(fname); /* windows does not replace file with rename() */
#endif
if(rename(tempf, fname) < 0) {
fatal_exit("rename(%s to %s): %s", tempf, fname, strerror(errno));
}
}
/**
* Verify if dnskey works for trust point
* @param env: environment (with time) for verification
* @param ve: validator environment (with options) for verification.
* @param tp: trust point to verify with
* @param rrset: DNSKEY rrset to verify.
* @return false on failure, true if verification successful.
*/
static int
verify_dnskey(struct module_env* env, struct val_env* ve,
struct trust_anchor* tp, struct ub_packed_rrset_key* rrset)
{
char* reason = NULL;
uint8_t sigalg[ALGO_NEEDS_MAX+1];
int downprot = env->cfg->harden_algo_downgrade;
enum sec_status sec = val_verify_DNSKEY_with_TA(env, ve, rrset,
tp->ds_rrset, tp->dnskey_rrset, downprot?sigalg:NULL, &reason);
/* sigalg is ignored, it returns algorithms signalled to exist, but
* in 5011 there are no other rrsets to check. if downprot is
* enabled, then it checks that the DNSKEY is signed with all
* algorithms available in the trust store. */
verbose(VERB_ALGO, "autotrust: validate DNSKEY with anchor: %s",
sec_status_to_string(sec));
return sec == sec_status_secure;
}
static int32_t
rrsig_get_expiry(uint8_t* d, size_t len)
{
/* rrsig: 2(rdlen), 2(type) 1(alg) 1(v) 4(origttl), then 4(expi), (4)incep) */
if(len < 2+8+4)
return 0;
return sldns_read_uint32(d+2+8);
}
/** Find minimum expiration interval from signatures */
static time_t
min_expiry(struct module_env* env, struct packed_rrset_data* dd)
{
size_t i;
int32_t t, r = 15 * 24 * 3600; /* 15 days max */
for(i=dd->count; i<dd->count+dd->rrsig_count; i++) {
t = rrsig_get_expiry(dd->rr_data[i], dd->rr_len[i]);
if((int32_t)t - (int32_t)*env->now > 0) {
t -= (int32_t)*env->now;
if(t < r)
r = t;
}
}
return (time_t)r;
}
/** Is rr self-signed revoked key */
static int
rr_is_selfsigned_revoked(struct module_env* env, struct val_env* ve,
struct ub_packed_rrset_key* dnskey_rrset, size_t i)
{
enum sec_status sec;
char* reason = NULL;
verbose(VERB_ALGO, "seen REVOKE flag, check self-signed, rr %d",
(int)i);
/* no algorithm downgrade protection necessary, if it is selfsigned
* revoked it can be removed. */
sec = dnskey_verify_rrset(env, ve, dnskey_rrset, dnskey_rrset, i,
&reason);
return (sec == sec_status_secure);
}
/** Set fetched value */
static void
seen_trustanchor(struct autr_ta* ta, uint8_t seen)
{
ta->fetched = seen;
if(ta->pending_count < 250) /* no numerical overflow, please */
ta->pending_count++;
}
/** set revoked value */
static void
seen_revoked_trustanchor(struct autr_ta* ta, uint8_t revoked)
{
ta->revoked = revoked;
}
/** revoke a trust anchor */
static void
revoke_dnskey(struct autr_ta* ta, int off)
{
uint16_t flags;
uint8_t* data;
if(sldns_wirerr_get_type(ta->rr, ta->rr_len, ta->dname_len) !=
LDNS_RR_TYPE_DNSKEY)
return;
if(sldns_wirerr_get_rdatalen(ta->rr, ta->rr_len, ta->dname_len) < 2)
return;
data = sldns_wirerr_get_rdata(ta->rr, ta->rr_len, ta->dname_len);
flags = sldns_read_uint16(data);
if (off && (flags&LDNS_KEY_REVOKE_KEY))
flags ^= LDNS_KEY_REVOKE_KEY; /* flip */
else
flags |= LDNS_KEY_REVOKE_KEY;
sldns_write_uint16(data, flags);
}
/** Compare two RRs skipping the REVOKED bit. Pass rdata(no len) */
static int
dnskey_compare_skip_revbit(uint8_t* a, size_t a_len, uint8_t* b, size_t b_len)
{
size_t i;
if(a_len != b_len)
return -1;
/* compare RRs RDATA byte for byte. */
for(i = 0; i < a_len; i++)
{
uint8_t rdf1, rdf2;
rdf1 = a[i];
rdf2 = b[i];
if(i==1) {
/* this is the second part of the flags field */
rdf1 |= LDNS_KEY_REVOKE_KEY;
rdf2 |= LDNS_KEY_REVOKE_KEY;
}
if (rdf1 < rdf2) return -1;
else if (rdf1 > rdf2) return 1;
}
return 0;
}
/** compare trust anchor with rdata, 0 if equal. Pass rdata(no len) */
static int
ta_compare(struct autr_ta* a, uint16_t t, uint8_t* b, size_t b_len)
{
if(!a) return -1;
else if(!b) return -1;
else if(sldns_wirerr_get_type(a->rr, a->rr_len, a->dname_len) != t)
return (int)sldns_wirerr_get_type(a->rr, a->rr_len,
a->dname_len) - (int)t;
else if(t == LDNS_RR_TYPE_DNSKEY) {
return dnskey_compare_skip_revbit(
sldns_wirerr_get_rdata(a->rr, a->rr_len, a->dname_len),
sldns_wirerr_get_rdatalen(a->rr, a->rr_len,
a->dname_len), b, b_len);
}
else if(t == LDNS_RR_TYPE_DS) {
if(sldns_wirerr_get_rdatalen(a->rr, a->rr_len, a->dname_len) !=
b_len)
return -1;
return memcmp(sldns_wirerr_get_rdata(a->rr,
a->rr_len, a->dname_len), b, b_len);
}
return -1;
}
/**
* Find key
* @param tp: to search in
* @param t: rr type of the rdata.
* @param rdata: to look for (no rdatalen in it)
* @param rdata_len: length of rdata
* @param result: returns NULL or the ta key looked for.
* @return false on malloc failure during search. if true examine result.
*/
static int
find_key(struct trust_anchor* tp, uint16_t t, uint8_t* rdata, size_t rdata_len,
struct autr_ta** result)
{
struct autr_ta* ta;
if(!tp || !rdata) {
*result = NULL;
return 0;
}
for(ta=tp->autr->keys; ta; ta=ta->next) {
if(ta_compare(ta, t, rdata, rdata_len) == 0) {
*result = ta;
return 1;
}
}
*result = NULL;
return 1;
}
/** add key and clone RR and tp already locked. rdata without rdlen. */
static struct autr_ta*
add_key(struct trust_anchor* tp, uint32_t ttl, uint8_t* rdata, size_t rdata_len)
{
struct autr_ta* ta;
uint8_t* rr;
size_t rr_len, dname_len;
uint16_t rrtype = htons(LDNS_RR_TYPE_DNSKEY);
uint16_t rrclass = htons(LDNS_RR_CLASS_IN);
uint16_t rdlen = htons(rdata_len);
dname_len = tp->namelen;
ttl = htonl(ttl);
rr_len = dname_len + 10 /* type,class,ttl,rdatalen */ + rdata_len;
rr = (uint8_t*)malloc(rr_len);
if(!rr) return NULL;
memmove(rr, tp->name, tp->namelen);
memmove(rr+dname_len, &rrtype, 2);
memmove(rr+dname_len+2, &rrclass, 2);
memmove(rr+dname_len+4, &ttl, 4);
memmove(rr+dname_len+8, &rdlen, 2);
memmove(rr+dname_len+10, rdata, rdata_len);
ta = autr_ta_create(rr, rr_len, dname_len);
if(!ta) {
/* rr freed in autr_ta_create */
return NULL;
}
/* link in, tp already locked */
ta->next = tp->autr->keys;
tp->autr->keys = ta;
return ta;
}
/** get TTL from DNSKEY rrset */
static time_t
key_ttl(struct ub_packed_rrset_key* k)
{
struct packed_rrset_data* d = (struct packed_rrset_data*)k->entry.data;
return d->ttl;
}
/** update the time values for the trustpoint */
static void
set_tp_times(struct trust_anchor* tp, time_t rrsig_exp_interval,
time_t origttl, int* changed)
{
time_t x, qi = tp->autr->query_interval, rt = tp->autr->retry_time;
/* x = MIN(15days, ttl/2, expire/2) */
x = 15 * 24 * 3600;
if(origttl/2 < x)
x = origttl/2;
if(rrsig_exp_interval/2 < x)
x = rrsig_exp_interval/2;
/* MAX(1hr, x) */
if(!autr_permit_small_holddown) {
if(x < 3600)
tp->autr->query_interval = 3600;
else tp->autr->query_interval = x;
} else tp->autr->query_interval = x;
/* x= MIN(1day, ttl/10, expire/10) */
x = 24 * 3600;
if(origttl/10 < x)
x = origttl/10;
if(rrsig_exp_interval/10 < x)
x = rrsig_exp_interval/10;
/* MAX(1hr, x) */
if(!autr_permit_small_holddown) {
if(x < 3600)
tp->autr->retry_time = 3600;
else tp->autr->retry_time = x;
} else tp->autr->retry_time = x;
if(qi != tp->autr->query_interval || rt != tp->autr->retry_time) {
*changed = 1;
verbose(VERB_ALGO, "orig_ttl is %d", (int)origttl);
verbose(VERB_ALGO, "rrsig_exp_interval is %d",
(int)rrsig_exp_interval);
verbose(VERB_ALGO, "query_interval: %d, retry_time: %d",
(int)tp->autr->query_interval,
(int)tp->autr->retry_time);
}
}
/** init events to zero */
static void
init_events(struct trust_anchor* tp)
{
struct autr_ta* ta;
for(ta=tp->autr->keys; ta; ta=ta->next) {
ta->fetched = 0;
}
}
/** check for revoked keys without trusting any other information */
static void
check_contains_revoked(struct module_env* env, struct val_env* ve,
struct trust_anchor* tp, struct ub_packed_rrset_key* dnskey_rrset,
int* changed)
{
struct packed_rrset_data* dd = (struct packed_rrset_data*)
dnskey_rrset->entry.data;
size_t i;
log_assert(ntohs(dnskey_rrset->rk.type) == LDNS_RR_TYPE_DNSKEY);
for(i=0; i<dd->count; i++) {
struct autr_ta* ta = NULL;
if(!rr_is_dnskey_sep(ntohs(dnskey_rrset->rk.type),
dd->rr_data[i]+2, dd->rr_len[i]-2) ||
!rr_is_dnskey_revoked(ntohs(dnskey_rrset->rk.type),
dd->rr_data[i]+2, dd->rr_len[i]-2))
continue; /* not a revoked KSK */
if(!find_key(tp, ntohs(dnskey_rrset->rk.type),
dd->rr_data[i]+2, dd->rr_len[i]-2, &ta)) {
log_err("malloc failure");
continue; /* malloc fail in compare*/
}
if(!ta)
continue; /* key not found */
if(rr_is_selfsigned_revoked(env, ve, dnskey_rrset, i)) {
/* checked if there is an rrsig signed by this key. */
/* same keytag, but stored can be revoked already, so
* compare keytags, with +0 or +128(REVOKE flag) */
log_assert(dnskey_calc_keytag(dnskey_rrset, i)-128 ==
sldns_calc_keytag_raw(sldns_wirerr_get_rdata(
ta->rr, ta->rr_len, ta->dname_len),
sldns_wirerr_get_rdatalen(ta->rr, ta->rr_len,
ta->dname_len)) ||
dnskey_calc_keytag(dnskey_rrset, i) ==
sldns_calc_keytag_raw(sldns_wirerr_get_rdata(
ta->rr, ta->rr_len, ta->dname_len),
sldns_wirerr_get_rdatalen(ta->rr, ta->rr_len,
ta->dname_len))); /* checks conversion*/
verbose_key(ta, VERB_ALGO, "is self-signed revoked");
if(!ta->revoked)
*changed = 1;
seen_revoked_trustanchor(ta, 1);
do_revoked(env, ta, changed);
}
}
}
/** See if a DNSKEY is verified by one of the DSes */
static int
key_matches_a_ds(struct module_env* env, struct val_env* ve,
struct ub_packed_rrset_key* dnskey_rrset, size_t key_idx,
struct ub_packed_rrset_key* ds_rrset)
{
struct packed_rrset_data* dd = (struct packed_rrset_data*)
ds_rrset->entry.data;
size_t ds_idx, num = dd->count;
int d = val_favorite_ds_algo(ds_rrset);
char* reason = "";
for(ds_idx=0; ds_idx<num; ds_idx++) {
if(!ds_digest_algo_is_supported(ds_rrset, ds_idx) ||
!ds_key_algo_is_supported(ds_rrset, ds_idx) ||
ds_get_digest_algo(ds_rrset, ds_idx) != d)
continue;
if(ds_get_key_algo(ds_rrset, ds_idx)
!= dnskey_get_algo(dnskey_rrset, key_idx)
|| dnskey_calc_keytag(dnskey_rrset, key_idx)
!= ds_get_keytag(ds_rrset, ds_idx)) {
continue;
}
if(!ds_digest_match_dnskey(env, dnskey_rrset, key_idx,
ds_rrset, ds_idx)) {
verbose(VERB_ALGO, "DS match attempt failed");
continue;
}
if(dnskey_verify_rrset(env, ve, dnskey_rrset,
dnskey_rrset, key_idx, &reason) == sec_status_secure) {
return 1;
} else {
verbose(VERB_ALGO, "DS match failed because the key "
"does not verify the keyset: %s", reason);
}
}
return 0;
}
/** Set update events */
static int
update_events(struct module_env* env, struct val_env* ve,
struct trust_anchor* tp, struct ub_packed_rrset_key* dnskey_rrset,
int* changed)
{
struct packed_rrset_data* dd = (struct packed_rrset_data*)
dnskey_rrset->entry.data;
size_t i;
log_assert(ntohs(dnskey_rrset->rk.type) == LDNS_RR_TYPE_DNSKEY);
init_events(tp);
for(i=0; i<dd->count; i++) {
struct autr_ta* ta = NULL;
if(!rr_is_dnskey_sep(ntohs(dnskey_rrset->rk.type),
dd->rr_data[i]+2, dd->rr_len[i]-2))
continue;
if(rr_is_dnskey_revoked(ntohs(dnskey_rrset->rk.type),
dd->rr_data[i]+2, dd->rr_len[i]-2)) {
/* self-signed revoked keys already detected before,
* other revoked keys are not 'added' again */
continue;
}
/* is a key of this type supported?. Note rr_list and
* packed_rrset are in the same order. */
if(!dnskey_algo_is_supported(dnskey_rrset, i)) {
/* skip unknown algorithm key, it is useless to us */
log_nametypeclass(VERB_DETAIL, "trust point has "
"unsupported algorithm at",
tp->name, LDNS_RR_TYPE_DNSKEY, tp->dclass);
continue;
}
/* is it new? if revocation bit set, find the unrevoked key */
if(!find_key(tp, ntohs(dnskey_rrset->rk.type),
dd->rr_data[i]+2, dd->rr_len[i]-2, &ta)) {
return 0;
}
if(!ta) {
ta = add_key(tp, (uint32_t)dd->rr_ttl[i],
dd->rr_data[i]+2, dd->rr_len[i]-2);
*changed = 1;
/* first time seen, do we have DSes? if match: VALID */
if(ta && tp->ds_rrset && key_matches_a_ds(env, ve,
dnskey_rrset, i, tp->ds_rrset)) {
verbose_key(ta, VERB_ALGO, "verified by DS");
ta->s = AUTR_STATE_VALID;
}
}
if(!ta) {
return 0;
}
seen_trustanchor(ta, 1);
verbose_key(ta, VERB_ALGO, "in DNS response");
}
set_tp_times(tp, min_expiry(env, dd), key_ttl(dnskey_rrset), changed);
return 1;
}
/**
* Check if the holddown time has already exceeded
* setting: add-holddown: add holddown timer
* setting: del-holddown: del holddown timer
* @param env: environment with current time
* @param ta: trust anchor to check for.
* @param holddown: the timer value
* @return number of seconds the holddown has passed.
*/
static time_t
check_holddown(struct module_env* env, struct autr_ta* ta,
unsigned int holddown)
{
time_t elapsed;
if(*env->now < ta->last_change) {
log_warn("time goes backwards. delaying key holddown");
return 0;
}
elapsed = *env->now - ta->last_change;
if (elapsed > (time_t)holddown) {
return elapsed-(time_t)holddown;
}
verbose_key(ta, VERB_ALGO, "holddown time " ARG_LL "d seconds to go",
(long long) ((time_t)holddown-elapsed));
return 0;
}
/** Set last_change to now */
static void
reset_holddown(struct module_env* env, struct autr_ta* ta, int* changed)
{
ta->last_change = *env->now;
*changed = 1;
}
/** Set the state for this trust anchor */
static void
set_trustanchor_state(struct module_env* env, struct autr_ta* ta, int* changed,
autr_state_t s)
{
verbose_key(ta, VERB_ALGO, "update: %s to %s",
trustanchor_state2str(ta->s), trustanchor_state2str(s));
ta->s = s;
reset_holddown(env, ta, changed);
}
/** Event: NewKey */
static void
do_newkey(struct module_env* env, struct autr_ta* anchor, int* c)
{
if (anchor->s == AUTR_STATE_START)
set_trustanchor_state(env, anchor, c, AUTR_STATE_ADDPEND);
}
/** Event: AddTime */
static void
do_addtime(struct module_env* env, struct autr_ta* anchor, int* c)
{
/* This not according to RFC, this is 30 days, but the RFC demands
* MAX(30days, TTL expire time of first DNSKEY set with this key),
* The value may be too small if a very large TTL was used. */
time_t exceeded = check_holddown(env, anchor, env->cfg->add_holddown);
if (exceeded && anchor->s == AUTR_STATE_ADDPEND) {
verbose_key(anchor, VERB_ALGO, "add-holddown time exceeded "
ARG_LL "d seconds ago, and pending-count %d",
(long long)exceeded, anchor->pending_count);
if(anchor->pending_count >= MIN_PENDINGCOUNT) {
set_trustanchor_state(env, anchor, c, AUTR_STATE_VALID);
anchor->pending_count = 0;
return;
}
verbose_key(anchor, VERB_ALGO, "add-holddown time sanity check "
"failed (pending count: %d)", anchor->pending_count);
}
}
/** Event: RemTime */
static void
do_remtime(struct module_env* env, struct autr_ta* anchor, int* c)
{
time_t exceeded = check_holddown(env, anchor, env->cfg->del_holddown);
if(exceeded && anchor->s == AUTR_STATE_REVOKED) {
verbose_key(anchor, VERB_ALGO, "del-holddown time exceeded "
ARG_LL "d seconds ago", (long long)exceeded);
set_trustanchor_state(env, anchor, c, AUTR_STATE_REMOVED);
}
}
/** Event: KeyRem */
static void
do_keyrem(struct module_env* env, struct autr_ta* anchor, int* c)
{
if(anchor->s == AUTR_STATE_ADDPEND) {
set_trustanchor_state(env, anchor, c, AUTR_STATE_START);
anchor->pending_count = 0;
} else if(anchor->s == AUTR_STATE_VALID)
set_trustanchor_state(env, anchor, c, AUTR_STATE_MISSING);
}
/** Event: KeyPres */
static void
do_keypres(struct module_env* env, struct autr_ta* anchor, int* c)
{
if(anchor->s == AUTR_STATE_MISSING)
set_trustanchor_state(env, anchor, c, AUTR_STATE_VALID);
}
/* Event: Revoked */
static void
do_revoked(struct module_env* env, struct autr_ta* anchor, int* c)
{
if(anchor->s == AUTR_STATE_VALID || anchor->s == AUTR_STATE_MISSING) {
set_trustanchor_state(env, anchor, c, AUTR_STATE_REVOKED);
verbose_key(anchor, VERB_ALGO, "old id, prior to revocation");
revoke_dnskey(anchor, 0);
verbose_key(anchor, VERB_ALGO, "new id, after revocation");
}
}
/** Do statestable transition matrix for anchor */
static void
anchor_state_update(struct module_env* env, struct autr_ta* anchor, int* c)
{
log_assert(anchor);
switch(anchor->s) {
/* START */
case AUTR_STATE_START:
/* NewKey: ADDPEND */
if (anchor->fetched)
do_newkey(env, anchor, c);
break;
/* ADDPEND */
case AUTR_STATE_ADDPEND:
/* KeyRem: START */
if (!anchor->fetched)
do_keyrem(env, anchor, c);
/* AddTime: VALID */
else do_addtime(env, anchor, c);
break;
/* VALID */
case AUTR_STATE_VALID:
/* RevBit: REVOKED */
if (anchor->revoked)
do_revoked(env, anchor, c);
/* KeyRem: MISSING */
else if (!anchor->fetched)
do_keyrem(env, anchor, c);
else if(!anchor->last_change) {
verbose_key(anchor, VERB_ALGO, "first seen");
reset_holddown(env, anchor, c);
}
break;
/* MISSING */
case AUTR_STATE_MISSING:
/* RevBit: REVOKED */
if (anchor->revoked)
do_revoked(env, anchor, c);
/* KeyPres */
else if (anchor->fetched)
do_keypres(env, anchor, c);
break;
/* REVOKED */
case AUTR_STATE_REVOKED:
if (anchor->fetched)
reset_holddown(env, anchor, c);
/* RemTime: REMOVED */
else do_remtime(env, anchor, c);
break;
/* REMOVED */
case AUTR_STATE_REMOVED:
default:
break;
}
}
/** if ZSK init then trust KSKs */
static int
init_zsk_to_ksk(struct module_env* env, struct trust_anchor* tp, int* changed)
{
/* search for VALID ZSKs */
struct autr_ta* anchor;
int validzsk = 0;
int validksk = 0;
for(anchor = tp->autr->keys; anchor; anchor = anchor->next) {
/* last_change test makes sure it was manually configured */
if(sldns_wirerr_get_type(anchor->rr, anchor->rr_len,
anchor->dname_len) == LDNS_RR_TYPE_DNSKEY &&
anchor->last_change == 0 &&
!ta_is_dnskey_sep(anchor) &&
anchor->s == AUTR_STATE_VALID)
validzsk++;
}
if(validzsk == 0)
return 0;
for(anchor = tp->autr->keys; anchor; anchor = anchor->next) {
if (ta_is_dnskey_sep(anchor) &&
anchor->s == AUTR_STATE_ADDPEND) {
verbose_key(anchor, VERB_ALGO, "trust KSK from "
"ZSK(config)");
set_trustanchor_state(env, anchor, changed,
AUTR_STATE_VALID);
validksk++;
}
}
return validksk;
}
/** Remove missing trustanchors so the list does not grow forever */
static void
remove_missing_trustanchors(struct module_env* env, struct trust_anchor* tp,
int* changed)
{
struct autr_ta* anchor;
time_t exceeded;
int valid = 0;
/* see if we have anchors that are valid */
for(anchor = tp->autr->keys; anchor; anchor = anchor->next) {
/* Only do KSKs */
if (!ta_is_dnskey_sep(anchor))
continue;
if (anchor->s == AUTR_STATE_VALID)
valid++;
}
/* if there are no SEP Valid anchors, see if we started out with
* a ZSK (last-change=0) anchor, which is VALID and there are KSKs
* now that can be made valid. Do this immediately because there
* is no guarantee that the ZSKs get announced long enough. Usually
* this is immediately after init with a ZSK trusted, unless the domain
* was not advertising any KSKs at all. In which case we perfectly
* track the zero number of KSKs. */
if(valid == 0) {
valid = init_zsk_to_ksk(env, tp, changed);
if(valid == 0)
return;
}
for(anchor = tp->autr->keys; anchor; anchor = anchor->next) {
/* ignore ZSKs if newly added */
if(anchor->s == AUTR_STATE_START)
continue;
/* remove ZSKs if a KSK is present */
if (!ta_is_dnskey_sep(anchor)) {
if(valid > 0) {
verbose_key(anchor, VERB_ALGO, "remove ZSK "
"[%d key(s) VALID]", valid);
set_trustanchor_state(env, anchor, changed,
AUTR_STATE_REMOVED);
}
continue;
}
/* Only do MISSING keys */
if (anchor->s != AUTR_STATE_MISSING)
continue;
if(env->cfg->keep_missing == 0)
continue; /* keep forever */
exceeded = check_holddown(env, anchor, env->cfg->keep_missing);
/* If keep_missing has exceeded and we still have more than
* one valid KSK: remove missing trust anchor */
if (exceeded && valid > 0) {
verbose_key(anchor, VERB_ALGO, "keep-missing time "
"exceeded " ARG_LL "d seconds ago, [%d key(s) VALID]",
(long long)exceeded, valid);
set_trustanchor_state(env, anchor, changed,
AUTR_STATE_REMOVED);
}
}
}
/** Do the statetable from RFC5011 transition matrix */
static int
do_statetable(struct module_env* env, struct trust_anchor* tp, int* changed)
{
struct autr_ta* anchor;
for(anchor = tp->autr->keys; anchor; anchor = anchor->next) {
/* Only do KSKs */
if(!ta_is_dnskey_sep(anchor))
continue;
anchor_state_update(env, anchor, changed);
}
remove_missing_trustanchors(env, tp, changed);
return 1;
}
/** See if time alone makes ADDPEND to VALID transition */
static void
autr_holddown_exceed(struct module_env* env, struct trust_anchor* tp, int* c)
{
struct autr_ta* anchor;
for(anchor = tp->autr->keys; anchor; anchor = anchor->next) {
if(ta_is_dnskey_sep(anchor) &&
anchor->s == AUTR_STATE_ADDPEND)
do_addtime(env, anchor, c);
}
}
/** cleanup key list */
static void
autr_cleanup_keys(struct trust_anchor* tp)
{
struct autr_ta* p, **prevp;
prevp = &tp->autr->keys;
p = tp->autr->keys;
while(p) {
/* do we want to remove this key? */
if(p->s == AUTR_STATE_START || p->s == AUTR_STATE_REMOVED ||
sldns_wirerr_get_type(p->rr, p->rr_len, p->dname_len)
!= LDNS_RR_TYPE_DNSKEY) {
struct autr_ta* np = p->next;
/* remove */
free(p->rr);
free(p);
/* snip and go to next item */
*prevp = np;
p = np;
continue;
}
/* remove pending counts if no longer pending */
if(p->s != AUTR_STATE_ADDPEND)
p->pending_count = 0;
prevp = &p->next;
p = p->next;
}
}
/** calculate next probe time */
static time_t
calc_next_probe(struct module_env* env, time_t wait)
{
/* make it random, 90-100% */
time_t rnd, rest;
if(!autr_permit_small_holddown) {
if(wait < 3600)
wait = 3600;
} else {
if(wait == 0) wait = 1;
}
rnd = wait/10;
rest = wait-rnd;
rnd = (time_t)ub_random_max(env->rnd, (long int)rnd);
return (time_t)(*env->now + rest + rnd);
}
/** what is first probe time (anchors must be locked) */
static time_t
wait_probe_time(struct val_anchors* anchors)
{
rbnode_t* t = rbtree_first(&anchors->autr->probe);
if(t != RBTREE_NULL)
return ((struct trust_anchor*)t->key)->autr->next_probe_time;
return 0;
}
/** reset worker timer */
static void
reset_worker_timer(struct module_env* env)
{
struct timeval tv;
#ifndef S_SPLINT_S
time_t next = (time_t)wait_probe_time(env->anchors);
/* in case this is libunbound, no timer */
if(!env->probe_timer)
return;
if(next > *env->now)
tv.tv_sec = (time_t)(next - *env->now);
else tv.tv_sec = 0;
#endif
tv.tv_usec = 0;
comm_timer_set(env->probe_timer, &tv);
verbose(VERB_ALGO, "scheduled next probe in " ARG_LL "d sec", (long long)tv.tv_sec);
}
/** set next probe for trust anchor */
static int
set_next_probe(struct module_env* env, struct trust_anchor* tp,
struct ub_packed_rrset_key* dnskey_rrset)
{
struct trust_anchor key, *tp2;
time_t mold, mnew;
/* use memory allocated in rrset for temporary name storage */
key.node.key = &key;
key.name = dnskey_rrset->rk.dname;
key.namelen = dnskey_rrset->rk.dname_len;
key.namelabs = dname_count_labels(key.name);
key.dclass = tp->dclass;
lock_basic_unlock(&tp->lock);
/* fetch tp again and lock anchors, so that we can modify the trees */
lock_basic_lock(&env->anchors->lock);
tp2 = (struct trust_anchor*)rbtree_search(env->anchors->tree, &key);
if(!tp2) {
verbose(VERB_ALGO, "trustpoint was deleted in set_next_probe");
lock_basic_unlock(&env->anchors->lock);
return 0;
}
log_assert(tp == tp2);
lock_basic_lock(&tp->lock);
/* schedule */
mold = wait_probe_time(env->anchors);
(void)rbtree_delete(&env->anchors->autr->probe, tp);
tp->autr->next_probe_time = calc_next_probe(env,
tp->autr->query_interval);
(void)rbtree_insert(&env->anchors->autr->probe, &tp->autr->pnode);
mnew = wait_probe_time(env->anchors);
lock_basic_unlock(&env->anchors->lock);
verbose(VERB_ALGO, "next probe set in %d seconds",
(int)tp->autr->next_probe_time - (int)*env->now);
if(mold != mnew) {
reset_worker_timer(env);
}
return 1;
}
/** Revoke and Delete a trust point */
static void
autr_tp_remove(struct module_env* env, struct trust_anchor* tp,
struct ub_packed_rrset_key* dnskey_rrset)
{
struct trust_anchor* del_tp;
struct trust_anchor key;
struct autr_point_data pd;
time_t mold, mnew;
log_nametypeclass(VERB_OPS, "trust point was revoked",
tp->name, LDNS_RR_TYPE_DNSKEY, tp->dclass);
tp->autr->revoked = 1;
/* use space allocated for dnskey_rrset to save name of anchor */
memset(&key, 0, sizeof(key));
memset(&pd, 0, sizeof(pd));
key.autr = &pd;
key.node.key = &key;
pd.pnode.key = &key;
pd.next_probe_time = tp->autr->next_probe_time;
key.name = dnskey_rrset->rk.dname;
key.namelen = tp->namelen;
key.namelabs = tp->namelabs;
key.dclass = tp->dclass;
/* unlock */
lock_basic_unlock(&tp->lock);
/* take from tree. It could be deleted by someone else,hence (void). */
lock_basic_lock(&env->anchors->lock);
del_tp = (struct trust_anchor*)rbtree_delete(env->anchors->tree, &key);
mold = wait_probe_time(env->anchors);
(void)rbtree_delete(&env->anchors->autr->probe, &key);
mnew = wait_probe_time(env->anchors);
anchors_init_parents_locked(env->anchors);
lock_basic_unlock(&env->anchors->lock);
/* if !del_tp then the trust point is no longer present in the tree,
* it was deleted by someone else, who will write the zonefile and
* clean up the structure */
if(del_tp) {
/* save on disk */
del_tp->autr->next_probe_time = 0; /* no more probing for it */
autr_write_file(env, del_tp);
/* delete */
autr_point_delete(del_tp);
}
if(mold != mnew) {
reset_worker_timer(env);
}
}
int autr_process_prime(struct module_env* env, struct val_env* ve,
struct trust_anchor* tp, struct ub_packed_rrset_key* dnskey_rrset)
{
int changed = 0;
log_assert(tp && tp->autr);
/* autotrust update trust anchors */
/* the tp is locked, and stays locked unless it is deleted */
/* we could just catch the anchor here while another thread
* is busy deleting it. Just unlock and let the other do its job */
if(tp->autr->revoked) {
log_nametypeclass(VERB_ALGO, "autotrust not processed, "
"trust point revoked", tp->name,
LDNS_RR_TYPE_DNSKEY, tp->dclass);
lock_basic_unlock(&tp->lock);
return 0; /* it is revoked */
}
/* query_dnskeys(): */
tp->autr->last_queried = *env->now;
log_nametypeclass(VERB_ALGO, "autotrust process for",
tp->name, LDNS_RR_TYPE_DNSKEY, tp->dclass);
/* see if time alone makes some keys valid */
autr_holddown_exceed(env, tp, &changed);
if(changed) {
verbose(VERB_ALGO, "autotrust: morekeys, reassemble");
if(!autr_assemble(tp)) {
log_err("malloc failure assembling autotrust keys");
return 1; /* unchanged */
}
}
/* did we get any data? */
if(!dnskey_rrset) {
verbose(VERB_ALGO, "autotrust: no dnskey rrset");
/* no update of query_failed, because then we would have
* to write to disk. But we cannot because we maybe are
* still 'initialising' with DS records, that we cannot write
* in the full format (which only contains KSKs). */
return 1; /* trust point exists */
}
/* check for revoked keys to remove immediately */
check_contains_revoked(env, ve, tp, dnskey_rrset, &changed);
if(changed) {
verbose(VERB_ALGO, "autotrust: revokedkeys, reassemble");
if(!autr_assemble(tp)) {
log_err("malloc failure assembling autotrust keys");
return 1; /* unchanged */
}
if(!tp->ds_rrset && !tp->dnskey_rrset) {
/* no more keys, all are revoked */
/* this is a success for this probe attempt */
tp->autr->last_success = *env->now;
autr_tp_remove(env, tp, dnskey_rrset);
return 0; /* trust point removed */
}
}
/* verify the dnskey rrset and see if it is valid. */
if(!verify_dnskey(env, ve, tp, dnskey_rrset)) {
verbose(VERB_ALGO, "autotrust: dnskey did not verify.");
/* only increase failure count if this is not the first prime,
* this means there was a previous successful probe */
if(tp->autr->last_success) {
tp->autr->query_failed += 1;
autr_write_file(env, tp);
}
return 1; /* trust point exists */
}
tp->autr->last_success = *env->now;
tp->autr->query_failed = 0;
/* Add new trust anchors to the data structure
* - note which trust anchors are seen this probe.
* Set trustpoint query_interval and retry_time.
* - find minimum rrsig expiration interval
*/
if(!update_events(env, ve, tp, dnskey_rrset, &changed)) {
log_err("malloc failure in autotrust update_events. "
"trust point unchanged.");
return 1; /* trust point unchanged, so exists */
}
/* - for every SEP key do the 5011 statetable.
* - remove missing trustanchors (if veryold and we have new anchors).
*/
if(!do_statetable(env, tp, &changed)) {
log_err("malloc failure in autotrust do_statetable. "
"trust point unchanged.");
return 1; /* trust point unchanged, so exists */
}
autr_cleanup_keys(tp);
if(!set_next_probe(env, tp, dnskey_rrset))
return 0; /* trust point does not exist */
autr_write_file(env, tp);
if(changed) {
verbose(VERB_ALGO, "autotrust: changed, reassemble");
if(!autr_assemble(tp)) {
log_err("malloc failure assembling autotrust keys");
return 1; /* unchanged */
}
if(!tp->ds_rrset && !tp->dnskey_rrset) {
/* no more keys, all are revoked */
autr_tp_remove(env, tp, dnskey_rrset);
return 0; /* trust point removed */
}
} else verbose(VERB_ALGO, "autotrust: no changes");
return 1; /* trust point exists */
}
/** debug print a trust anchor key */
static void
autr_debug_print_ta(struct autr_ta* ta)
{
char buf[32];
char* str = sldns_wire2str_rr(ta->rr, ta->rr_len);
if(!str) {
log_info("out of memory in debug_print_ta");
return;
}
if(str && str[0]) str[strlen(str)-1]=0; /* remove newline */
ctime_r(&ta->last_change, buf);
if(buf[0]) buf[strlen(buf)-1]=0; /* remove newline */
log_info("[%s] %s ;;state:%d ;;pending_count:%d%s%s last:%s",
trustanchor_state2str(ta->s), str, ta->s, ta->pending_count,
ta->fetched?" fetched":"", ta->revoked?" revoked":"", buf);
free(str);
}
/** debug print a trust point */
static void
autr_debug_print_tp(struct trust_anchor* tp)
{
struct autr_ta* ta;
char buf[257];
if(!tp->autr)
return;
dname_str(tp->name, buf);
log_info("trust point %s : %d", buf, (int)tp->dclass);
log_info("assembled %d DS and %d DNSKEYs",
(int)tp->numDS, (int)tp->numDNSKEY);
if(tp->ds_rrset) {
log_packed_rrset(0, "DS:", tp->ds_rrset);
}
if(tp->dnskey_rrset) {
log_packed_rrset(0, "DNSKEY:", tp->dnskey_rrset);
}
log_info("file %s", tp->autr->file);
ctime_r(&tp->autr->last_queried, buf);
if(buf[0]) buf[strlen(buf)-1]=0; /* remove newline */
log_info("last_queried: %u %s", (unsigned)tp->autr->last_queried, buf);
ctime_r(&tp->autr->last_success, buf);
if(buf[0]) buf[strlen(buf)-1]=0; /* remove newline */
log_info("last_success: %u %s", (unsigned)tp->autr->last_success, buf);
ctime_r(&tp->autr->next_probe_time, buf);
if(buf[0]) buf[strlen(buf)-1]=0; /* remove newline */
log_info("next_probe_time: %u %s", (unsigned)tp->autr->next_probe_time,
buf);
log_info("query_interval: %u", (unsigned)tp->autr->query_interval);
log_info("retry_time: %u", (unsigned)tp->autr->retry_time);
log_info("query_failed: %u", (unsigned)tp->autr->query_failed);
for(ta=tp->autr->keys; ta; ta=ta->next) {
autr_debug_print_ta(ta);
}
}
void
autr_debug_print(struct val_anchors* anchors)
{
struct trust_anchor* tp;
lock_basic_lock(&anchors->lock);
RBTREE_FOR(tp, struct trust_anchor*, anchors->tree) {
lock_basic_lock(&tp->lock);
autr_debug_print_tp(tp);
lock_basic_unlock(&tp->lock);
}
lock_basic_unlock(&anchors->lock);
}
void probe_answer_cb(void* arg, int ATTR_UNUSED(rcode),
sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(sec),
char* ATTR_UNUSED(why_bogus))
{
/* retry was set before the query was done,
* re-querytime is set when query succeeded, but that may not
* have reset this timer because the query could have been
* handled by another thread. In that case, this callback would
* get called after the original timeout is done.
* By not resetting the timer, it may probe more often, but not
* less often.
* Unless the new lookup resulted in smaller TTLs and thus smaller
* timeout values. In that case one old TTL could be mistakenly done.
*/
struct module_env* env = (struct module_env*)arg;
verbose(VERB_ALGO, "autotrust probe answer cb");
reset_worker_timer(env);
}
/** probe a trust anchor DNSKEY and unlocks tp */
static void
probe_anchor(struct module_env* env, struct trust_anchor* tp)
{
struct query_info qinfo;
uint16_t qflags = BIT_RD;
struct edns_data edns;
sldns_buffer* buf = env->scratch_buffer;
qinfo.qname = regional_alloc_init(env->scratch, tp->name, tp->namelen);
if(!qinfo.qname) {
log_err("out of memory making 5011 probe");
return;
}
qinfo.qname_len = tp->namelen;
qinfo.qtype = LDNS_RR_TYPE_DNSKEY;
qinfo.qclass = tp->dclass;
qinfo.local_alias = NULL;
log_query_info(VERB_ALGO, "autotrust probe", &qinfo);
verbose(VERB_ALGO, "retry probe set in %d seconds",
(int)tp->autr->next_probe_time - (int)*env->now);
edns.edns_present = 1;
edns.ext_rcode = 0;
edns.edns_version = 0;
edns.bits = EDNS_DO;
edns.opt_list = NULL;
if(sldns_buffer_capacity(buf) < 65535)
edns.udp_size = (uint16_t)sldns_buffer_capacity(buf);
else edns.udp_size = 65535;
/* can't hold the lock while mesh_run is processing */
lock_basic_unlock(&tp->lock);
/* delete the DNSKEY from rrset and key cache so an active probe
* is done. First the rrset so another thread does not use it
* to recreate the key entry in a race condition. */
rrset_cache_remove(env->rrset_cache, qinfo.qname, qinfo.qname_len,
qinfo.qtype, qinfo.qclass, 0);
key_cache_remove(env->key_cache, qinfo.qname, qinfo.qname_len,
qinfo.qclass);
if(!mesh_new_callback(env->mesh, &qinfo, qflags, &edns, buf, 0,
&probe_answer_cb, env)) {
log_err("out of memory making 5011 probe");
}
}
/** fetch first to-probe trust-anchor and lock it and set retrytime */
static struct trust_anchor*
todo_probe(struct module_env* env, time_t* next)
{
struct trust_anchor* tp;
rbnode_t* el;
/* get first one */
lock_basic_lock(&env->anchors->lock);
if( (el=rbtree_first(&env->anchors->autr->probe)) == RBTREE_NULL) {
/* in case of revoked anchors */
lock_basic_unlock(&env->anchors->lock);
/* signal that there are no anchors to probe */
*next = 0;
return NULL;
}
tp = (struct trust_anchor*)el->key;
lock_basic_lock(&tp->lock);
/* is it eligible? */
if((time_t)tp->autr->next_probe_time > *env->now) {
/* no more to probe */
*next = (time_t)tp->autr->next_probe_time - *env->now;
lock_basic_unlock(&tp->lock);
lock_basic_unlock(&env->anchors->lock);
return NULL;
}
/* reset its next probe time */
(void)rbtree_delete(&env->anchors->autr->probe, tp);
tp->autr->next_probe_time = calc_next_probe(env, tp->autr->retry_time);
(void)rbtree_insert(&env->anchors->autr->probe, &tp->autr->pnode);
lock_basic_unlock(&env->anchors->lock);
return tp;
}
time_t
autr_probe_timer(struct module_env* env)
{
struct trust_anchor* tp;
time_t next_probe = 3600;
int num = 0;
if(autr_permit_small_holddown) next_probe = 1;
verbose(VERB_ALGO, "autotrust probe timer callback");
/* while there are still anchors to probe */
while( (tp = todo_probe(env, &next_probe)) ) {
/* make a probe for this anchor */
probe_anchor(env, tp);
num++;
}
regional_free_all(env->scratch);
if(next_probe == 0)
return 0; /* no trust points to probe */
verbose(VERB_ALGO, "autotrust probe timer %d callbacks done", num);
return next_probe;
}
|