/usr/sbin/samba_kcc is in samba-common-bin 2:4.1.6+dfsg-1ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 | #! /usr/bin/python2.7
#
# Compute our KCC topology
#
# Copyright (C) Dave Craft 2011
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import random
# ensure we get messages out immediately, so they get in the samba logs,
# and don't get swallowed by a timeout
os.environ['PYTHONUNBUFFERED'] = '1'
# forcing GMT avoids a problem in some timezones with kerberos. Both MIT
# heimdal can get mutual authentication errors due to the 24 second difference
# between UTC and GMT when using some zone files (eg. the PDT zone from
# the US)
os.environ["TZ"] = "GMT"
# Find right directory when running from source tree
import optparse
import logging
from samba import (
getopt as options,
Ldb,
ldb,
dsdb,
read_and_sub_file)
from samba.auth import system_session
from samba.samdb import SamDB
from samba.dcerpc import drsuapi
from samba.kcc_utils import *
class KCC(object):
"""The Knowledge Consistency Checker class.
A container for objects and methods allowing a run of the KCC. Produces a
set of connections in the samdb for which the Distributed Replication
Service can then utilize to replicate naming contexts
"""
def __init__(self):
"""Initializes the partitions class which can hold
our local DCs partitions or all the partitions in
the forest
"""
self.part_table = {} # partition objects
self.site_table = {}
self.transport_table = {}
self.sitelink_table = {}
# Used in inter-site topology computation. A list
# of connections (by NTDSConnection object) that are
# to be kept when pruning un-needed NTDS Connections
self.keep_connection_list = []
self.my_dsa_dnstr = None # My dsa DN
self.my_dsa = None # My dsa object
self.my_site_dnstr = None
self.my_site = None
self.samdb = None
def load_all_transports(self):
"""Loads the inter-site transport objects for Sites
::returns: Raises an Exception on error
"""
try:
res = self.samdb.search("CN=Inter-Site Transports,CN=Sites,%s" %
self.samdb.get_config_basedn(),
scope=ldb.SCOPE_SUBTREE,
expression="(objectClass=interSiteTransport)")
except ldb.LdbError, (enum, estr):
raise Exception("Unable to find inter-site transports - (%s)" %
estr)
for msg in res:
dnstr = str(msg.dn)
# already loaded
if dnstr in self.transport_table.keys():
continue
transport = Transport(dnstr)
transport.load_transport(self.samdb)
# Assign this transport to table
# and index by dn
self.transport_table[dnstr] = transport
def load_all_sitelinks(self):
"""Loads the inter-site siteLink objects
::returns: Raises an Exception on error
"""
try:
res = self.samdb.search("CN=Inter-Site Transports,CN=Sites,%s" %
self.samdb.get_config_basedn(),
scope=ldb.SCOPE_SUBTREE,
expression="(objectClass=siteLink)")
except ldb.LdbError, (enum, estr):
raise Exception("Unable to find inter-site siteLinks - (%s)" % estr)
for msg in res:
dnstr = str(msg.dn)
# already loaded
if dnstr in self.sitelink_table.keys():
continue
sitelink = SiteLink(dnstr)
sitelink.load_sitelink(self.samdb)
# Assign this siteLink to table
# and index by dn
self.sitelink_table[dnstr] = sitelink
def get_sitelink(self, site1_dnstr, site2_dnstr):
"""Return the siteLink (if it exists) that connects the
two input site DNs
"""
for sitelink in self.sitelink_table.values():
if sitelink.is_sitelink(site1_dnstr, site2_dnstr):
return sitelink
return None
def load_my_site(self):
"""Loads the Site class for the local DSA
::returns: Raises an Exception on error
"""
self.my_site_dnstr = "CN=%s,CN=Sites,%s" % (
self.samdb.server_site_name(),
self.samdb.get_config_basedn())
site = Site(self.my_site_dnstr)
site.load_site(self.samdb)
self.site_table[self.my_site_dnstr] = site
self.my_site = site
def load_all_sites(self):
"""Discover all sites and instantiate and load each
NTDS Site settings.
::returns: Raises an Exception on error
"""
try:
res = self.samdb.search("CN=Sites,%s" %
self.samdb.get_config_basedn(),
scope=ldb.SCOPE_SUBTREE,
expression="(objectClass=site)")
except ldb.LdbError, (enum, estr):
raise Exception("Unable to find sites - (%s)" % estr)
for msg in res:
sitestr = str(msg.dn)
# already loaded
if sitestr in self.site_table.keys():
continue
site = Site(sitestr)
site.load_site(self.samdb)
self.site_table[sitestr] = site
def load_my_dsa(self):
"""Discover my nTDSDSA dn thru the rootDSE entry
::returns: Raises an Exception on error.
"""
dn = ldb.Dn(self.samdb, "")
try:
res = self.samdb.search(base=dn, scope=ldb.SCOPE_BASE,
attrs=["dsServiceName"])
except ldb.LdbError, (enum, estr):
raise Exception("Unable to find my nTDSDSA - (%s)" % estr)
self.my_dsa_dnstr = res[0]["dsServiceName"][0]
self.my_dsa = self.my_site.get_dsa(self.my_dsa_dnstr)
def load_all_partitions(self):
"""Discover all NCs thru the Partitions dn and
instantiate and load the NCs.
Each NC is inserted into the part_table by partition
dn string (not the nCName dn string)
::returns: Raises an Exception on error
"""
try:
res = self.samdb.search("CN=Partitions,%s" %
self.samdb.get_config_basedn(),
scope=ldb.SCOPE_SUBTREE,
expression="(objectClass=crossRef)")
except ldb.LdbError, (enum, estr):
raise Exception("Unable to find partitions - (%s)" % estr)
for msg in res:
partstr = str(msg.dn)
# already loaded
if partstr in self.part_table.keys():
continue
part = Partition(partstr)
part.load_partition(self.samdb)
self.part_table[partstr] = part
def should_be_present_test(self):
"""Enumerate all loaded partitions and DSAs in local
site and test if NC should be present as replica
"""
for partdn, part in self.part_table.items():
for dsadn, dsa in self.my_site.dsa_table.items():
needed, ro, partial = part.should_be_present(dsa)
logger.info("dsadn:%s\nncdn:%s\nneeded=%s:ro=%s:partial=%s\n" %
(dsadn, part.nc_dnstr, needed, ro, partial))
def refresh_failed_links_connections(self):
# XXX - not implemented yet
pass
def is_stale_link_connection(self, target_dsa):
"""Returns False if no tuple z exists in the kCCFailedLinks or
kCCFailedConnections variables such that z.UUIDDsa is the
objectGUID of the target dsa, z.FailureCount > 0, and
the current time - z.TimeFirstFailure > 2 hours.
"""
# XXX - not implemented yet
return False
def remove_unneeded_failed_links_connections(self):
# XXX - not implemented yet
pass
def remove_unneeded_ntdsconn(self, all_connected):
"""Removes unneeded NTDS Connections after computation
of KCC intra and inter-site topology has finished.
"""
mydsa = self.my_dsa
# Loop thru connections
for cn_dnstr, cn_conn in mydsa.connect_table.items():
s_dnstr = cn_conn.get_from_dnstr()
if s_dnstr is None:
cn_conn.to_be_deleted = True
continue
# Get the source DSA no matter what site
s_dsa = self.get_dsa(s_dnstr)
# Check if the DSA is in our site
if self.my_site.same_site(s_dsa):
same_site = True
else:
same_site = False
# Given an nTDSConnection object cn, if the DC with the
# nTDSDSA object dc that is the parent object of cn and
# the DC with the nTDSDA object referenced by cn!fromServer
# are in the same site, the KCC on dc deletes cn if all of
# the following are true:
#
# Bit NTDSCONN_OPT_IS_GENERATED is clear in cn!options.
#
# No site settings object s exists for the local DC's site, or
# bit NTDSSETTINGS_OPT_IS_TOPL_CLEANUP_DISABLED is clear in
# s!options.
#
# Another nTDSConnection object cn2 exists such that cn and
# cn2 have the same parent object, cn!fromServer = cn2!fromServer,
# and either
#
# cn!whenCreated < cn2!whenCreated
#
# cn!whenCreated = cn2!whenCreated and
# cn!objectGUID < cn2!objectGUID
#
# Bit NTDSCONN_OPT_RODC_TOPOLOGY is clear in cn!options
if same_site:
if not cn_conn.is_generated():
continue
if self.my_site.is_cleanup_ntdsconn_disabled():
continue
# Loop thru connections looking for a duplicate that
# fulfills the previous criteria
lesser = False
for cn2_dnstr, cn2_conn in mydsa.connect_table.items():
if cn2_conn is cn_conn:
continue
s2_dnstr = cn2_conn.get_from_dnstr()
if s2_dnstr is None:
continue
# If the NTDS Connections has a different
# fromServer field then no match
if s2_dnstr != s_dnstr:
continue
lesser = (cn_conn.whenCreated < cn2_conn.whenCreated or
(cn_conn.whenCreated == cn2_conn.whenCreated and
cmp(cn_conn.guid, cn2_conn.guid) < 0))
if lesser:
break
if lesser and not cn_conn.is_rodc_topology():
cn_conn.to_be_deleted = True
# Given an nTDSConnection object cn, if the DC with the nTDSDSA
# object dc that is the parent object of cn and the DC with
# the nTDSDSA object referenced by cn!fromServer are in
# different sites, a KCC acting as an ISTG in dc's site
# deletes cn if all of the following are true:
#
# Bit NTDSCONN_OPT_IS_GENERATED is clear in cn!options.
#
# cn!fromServer references an nTDSDSA object for a DC
# in a site other than the local DC's site.
#
# The keepConnections sequence returned by
# CreateIntersiteConnections() does not contain
# cn!objectGUID, or cn is "superseded by" (see below)
# another nTDSConnection cn2 and keepConnections
# contains cn2!objectGUID.
#
# The return value of CreateIntersiteConnections()
# was true.
#
# Bit NTDSCONN_OPT_RODC_TOPOLOGY is clear in
# cn!options
#
else: # different site
if not mydsa.is_istg():
continue
if not cn_conn.is_generated():
continue
if self.keep_connection(cn_conn):
continue
# XXX - To be implemented
if not all_connected:
continue
if not cn_conn.is_rodc_topology():
cn_conn.to_be_deleted = True
if opts.readonly:
for dnstr, connect in mydsa.connect_table.items():
if connect.to_be_deleted:
logger.info("TO BE DELETED:\n%s" % connect)
if connect.to_be_added:
logger.info("TO BE ADDED:\n%s" % connect)
# Peform deletion from our tables but perform
# no database modification
mydsa.commit_connections(self.samdb, ro=True)
else:
# Commit any modified connections
mydsa.commit_connections(self.samdb)
def get_dsa_by_guidstr(self, guidstr):
"""Given a DSA guid string, consule all sites looking
for the corresponding DSA and return it.
"""
for site in self.site_table.values():
dsa = site.get_dsa_by_guidstr(guidstr)
if dsa is not None:
return dsa
return None
def get_dsa(self, dnstr):
"""Given a DSA dn string, consule all sites looking
for the corresponding DSA and return it.
"""
for site in self.site_table.values():
dsa = site.get_dsa(dnstr)
if dsa is not None:
return dsa
return None
def modify_repsFrom(self, n_rep, t_repsFrom, s_rep, s_dsa, cn_conn):
"""Update t_repsFrom if necessary to satisfy requirements. Such
updates are typically required when the IDL_DRSGetNCChanges
server has moved from one site to another--for example, to
enable compression when the server is moved from the
client's site to another site.
:param n_rep: NC replica we need
:param t_repsFrom: repsFrom tuple to modify
:param s_rep: NC replica at source DSA
:param s_dsa: source DSA
:param cn_conn: Local DSA NTDSConnection child
::returns: (update) bit field containing which portion of the
repsFrom was modified. This bit field is suitable as input
to IDL_DRSReplicaModify ulModifyFields element, as it consists
of these bits:
drsuapi.DRSUAPI_DRS_UPDATE_SCHEDULE
drsuapi.DRSUAPI_DRS_UPDATE_FLAGS
drsuapi.DRSUAPI_DRS_UPDATE_ADDRESS
"""
s_dnstr = s_dsa.dsa_dnstr
update = 0x0
if self.my_site.same_site(s_dsa):
same_site = True
else:
same_site = False
times = cn_conn.convert_schedule_to_repltimes()
# if schedule doesn't match then update and modify
if times != t_repsFrom.schedule:
t_repsFrom.schedule = times
# Bit DRS_PER_SYNC is set in replicaFlags if and only
# if nTDSConnection schedule has a value v that specifies
# scheduled replication is to be performed at least once
# per week.
if cn_conn.is_schedule_minimum_once_per_week():
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_PER_SYNC) == 0x0:
t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_PER_SYNC
# Bit DRS_INIT_SYNC is set in t.replicaFlags if and only
# if the source DSA and the local DC's nTDSDSA object are
# in the same site or source dsa is the FSMO role owner
# of one or more FSMO roles in the NC replica.
if same_site or n_rep.is_fsmo_role_owner(s_dnstr):
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_INIT_SYNC) == 0x0:
t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_INIT_SYNC
# If bit NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT is set in
# cn!options, bit DRS_NEVER_NOTIFY is set in t.replicaFlags
# if and only if bit NTDSCONN_OPT_USE_NOTIFY is clear in
# cn!options. Otherwise, bit DRS_NEVER_NOTIFY is set in
# t.replicaFlags if and only if s and the local DC's
# nTDSDSA object are in different sites.
if (cn_conn.options & dsdb.NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT) != 0x0:
if (cn_conn.option & dsdb.NTDSCONN_OPT_USE_NOTIFY) == 0x0:
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_NEVER_NOTIFY) == 0x0:
t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_NEVER_NOTIFY
elif not same_site:
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_NEVER_NOTIFY) == 0x0:
t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_NEVER_NOTIFY
# Bit DRS_USE_COMPRESSION is set in t.replicaFlags if
# and only if s and the local DC's nTDSDSA object are
# not in the same site and the
# NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION bit is
# clear in cn!options
if (not same_site and
(cn_conn.options &
dsdb.NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION) == 0x0):
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_USE_COMPRESSION) == 0x0:
t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_USE_COMPRESSION
# Bit DRS_TWOWAY_SYNC is set in t.replicaFlags if and only
# if bit NTDSCONN_OPT_TWOWAY_SYNC is set in cn!options.
if (cn_conn.options & dsdb.NTDSCONN_OPT_TWOWAY_SYNC) != 0x0:
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_TWOWAY_SYNC) == 0x0:
t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_TWOWAY_SYNC
# Bits DRS_DISABLE_AUTO_SYNC and DRS_DISABLE_PERIODIC_SYNC are
# set in t.replicaFlags if and only if cn!enabledConnection = false.
if not cn_conn.is_enabled():
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_DISABLE_AUTO_SYNC) == 0x0:
t_repsFrom.replica_flags |= \
drsuapi.DRSUAPI_DRS_DISABLE_AUTO_SYNC
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_DISABLE_PERIODIC_SYNC) == 0x0:
t_repsFrom.replica_flags |= \
drsuapi.DRSUAPI_DRS_DISABLE_PERIODIC_SYNC
# If s and the local DC's nTDSDSA object are in the same site,
# cn!transportType has no value, or the RDN of cn!transportType
# is CN=IP:
#
# Bit DRS_MAIL_REP in t.replicaFlags is clear.
#
# t.uuidTransport = NULL GUID.
#
# t.uuidDsa = The GUID-based DNS name of s.
#
# Otherwise:
#
# Bit DRS_MAIL_REP in t.replicaFlags is set.
#
# If x is the object with dsname cn!transportType,
# t.uuidTransport = x!objectGUID.
#
# Let a be the attribute identified by
# x!transportAddressAttribute. If a is
# the dNSHostName attribute, t.uuidDsa = the GUID-based
# DNS name of s. Otherwise, t.uuidDsa = (s!parent)!a.
#
# It appears that the first statement i.e.
#
# "If s and the local DC's nTDSDSA object are in the same
# site, cn!transportType has no value, or the RDN of
# cn!transportType is CN=IP:"
#
# could be a slightly tighter statement if it had an "or"
# between each condition. I believe this should
# be interpreted as:
#
# IF (same-site) OR (no-value) OR (type-ip)
#
# because IP should be the primary transport mechanism
# (even in inter-site) and the absense of the transportType
# attribute should always imply IP no matter if its multi-site
#
# NOTE MS-TECH INCORRECT:
#
# All indications point to these statements above being
# incorrectly stated:
#
# t.uuidDsa = The GUID-based DNS name of s.
#
# Let a be the attribute identified by
# x!transportAddressAttribute. If a is
# the dNSHostName attribute, t.uuidDsa = the GUID-based
# DNS name of s. Otherwise, t.uuidDsa = (s!parent)!a.
#
# because the uuidDSA is a GUID and not a GUID-base DNS
# name. Nor can uuidDsa hold (s!parent)!a if not
# dNSHostName. What should have been said is:
#
# t.naDsa = The GUID-based DNS name of s
#
# That would also be correct if transportAddressAttribute
# were "mailAddress" because (naDsa) can also correctly
# hold the SMTP ISM service address.
#
nastr = "%s._msdcs.%s" % (s_dsa.dsa_guid, self.samdb.forest_dns_name())
# We're not currently supporting SMTP replication
# so is_smtp_replication_available() is currently
# always returning False
if (same_site or
cn_conn.transport_dnstr is None or
cn_conn.transport_dnstr.find("CN=IP") == 0 or
not is_smtp_replication_available()):
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_MAIL_REP) != 0x0:
t_repsFrom.replica_flags &= ~drsuapi.DRSUAPI_DRS_MAIL_REP
null_guid = misc.GUID()
if (t_repsFrom.transport_guid is None or
t_repsFrom.transport_guid != null_guid):
t_repsFrom.transport_guid = null_guid
# See (NOTE MS-TECH INCORRECT) above
if t_repsFrom.version == 0x1:
if t_repsFrom.dns_name1 is None or \
t_repsFrom.dns_name1 != nastr:
t_repsFrom.dns_name1 = nastr
else:
if t_repsFrom.dns_name1 is None or \
t_repsFrom.dns_name2 is None or \
t_repsFrom.dns_name1 != nastr or \
t_repsFrom.dns_name2 != nastr:
t_repsFrom.dns_name1 = nastr
t_repsFrom.dns_name2 = nastr
else:
if (t_repsFrom.replica_flags &
drsuapi.DRSUAPI_DRS_MAIL_REP) == 0x0:
t_repsFrom.replica_flags |= drsuapi.DRSUAPI_DRS_MAIL_REP
# We have a transport type but its not an
# object in the database
if cn_conn.transport_dnstr not in self.transport_table.keys():
raise Exception("Missing inter-site transport - (%s)" %
cn_conn.transport_dnstr)
x_transport = self.transport_table[cn_conn.transport_dnstr]
if t_repsFrom.transport_guid != x_transport.guid:
t_repsFrom.transport_guid = x_transport.guid
# See (NOTE MS-TECH INCORRECT) above
if x_transport.address_attr == "dNSHostName":
if t_repsFrom.version == 0x1:
if t_repsFrom.dns_name1 is None or \
t_repsFrom.dns_name1 != nastr:
t_repsFrom.dns_name1 = nastr
else:
if t_repsFrom.dns_name1 is None or \
t_repsFrom.dns_name2 is None or \
t_repsFrom.dns_name1 != nastr or \
t_repsFrom.dns_name2 != nastr:
t_repsFrom.dns_name1 = nastr
t_repsFrom.dns_name2 = nastr
else:
# MS tech specification says we retrieve the named
# attribute in "transportAddressAttribute" from the parent of
# the DSA object
try:
pdnstr = s_dsa.get_parent_dnstr()
attrs = [ x_transport.address_attr ]
res = self.samdb.search(base=pdnstr, scope=ldb.SCOPE_BASE,
attrs=attrs)
except ldb.ldbError, (enum, estr):
raise Exception \
("Unable to find attr (%s) for (%s) - (%s)" %
(x_transport.address_attr, pdnstr, estr))
msg = res[0]
nastr = str(msg[x_transport.address_attr][0])
# See (NOTE MS-TECH INCORRECT) above
if t_repsFrom.version == 0x1:
if t_repsFrom.dns_name1 is None or \
t_repsFrom.dns_name1 != nastr:
t_repsFrom.dns_name1 = nastr
else:
if t_repsFrom.dns_name1 is None or \
t_repsFrom.dns_name2 is None or \
t_repsFrom.dns_name1 != nastr or \
t_repsFrom.dns_name2 != nastr:
t_repsFrom.dns_name1 = nastr
t_repsFrom.dns_name2 = nastr
if t_repsFrom.is_modified():
logger.debug("modify_repsFrom(): %s" % t_repsFrom)
def is_repsFrom_implied(self, n_rep, cn_conn):
"""Given a NC replica and NTDS Connection, determine if the connection
implies a repsFrom tuple should be present from the source DSA listed
in the connection to the naming context
:param n_rep: NC replica
:param conn: NTDS Connection
::returns (True || False), source DSA:
"""
# NTDS Connection must satisfy all the following criteria
# to imply a repsFrom tuple is needed:
#
# cn!enabledConnection = true.
# cn!options does not contain NTDSCONN_OPT_RODC_TOPOLOGY.
# cn!fromServer references an nTDSDSA object.
s_dsa = None
if cn_conn.is_enabled() and not cn_conn.is_rodc_topology():
s_dnstr = cn_conn.get_from_dnstr()
if s_dnstr is not None:
s_dsa = self.get_dsa(s_dnstr)
# No DSA matching this source DN string?
if s_dsa is None:
return False, None
# To imply a repsFrom tuple is needed, each of these
# must be True:
#
# An NC replica of the NC "is present" on the DC to
# which the nTDSDSA object referenced by cn!fromServer
# corresponds.
#
# An NC replica of the NC "should be present" on
# the local DC
s_rep = s_dsa.get_current_replica(n_rep.nc_dnstr)
if s_rep is None or not s_rep.is_present():
return False, None
# To imply a repsFrom tuple is needed, each of these
# must be True:
#
# The NC replica on the DC referenced by cn!fromServer is
# a writable replica or the NC replica that "should be
# present" on the local DC is a partial replica.
#
# The NC is not a domain NC, the NC replica that
# "should be present" on the local DC is a partial
# replica, cn!transportType has no value, or
# cn!transportType has an RDN of CN=IP.
#
implied = (not s_rep.is_ro() or n_rep.is_partial()) and \
(not n_rep.is_domain() or
n_rep.is_partial() or
cn_conn.transport_dnstr is None or
cn_conn.transport_dnstr.find("CN=IP") == 0)
if implied:
return True, s_dsa
else:
return False, None
def translate_ntdsconn(self):
"""This function adjusts values of repsFrom abstract attributes of NC
replicas on the local DC to match those implied by
nTDSConnection objects.
"""
logger.debug("translate_ntdsconn(): enter")
if self.my_dsa.is_translate_ntdsconn_disabled():
return
current_rep_table, needed_rep_table = self.my_dsa.get_rep_tables()
# Filled in with replicas we currently have that need deleting
delete_rep_table = {}
# We're using the MS notation names here to allow
# correlation back to the published algorithm.
#
# n_rep - NC replica (n)
# t_repsFrom - tuple (t) in n!repsFrom
# s_dsa - Source DSA of the replica. Defined as nTDSDSA
# object (s) such that (s!objectGUID = t.uuidDsa)
# In our IDL representation of repsFrom the (uuidDsa)
# attribute is called (source_dsa_obj_guid)
# cn_conn - (cn) is nTDSConnection object and child of the local DC's
# nTDSDSA object and (cn!fromServer = s)
# s_rep - source DSA replica of n
#
# If we have the replica and its not needed
# then we add it to the "to be deleted" list.
for dnstr, n_rep in current_rep_table.items():
if dnstr not in needed_rep_table.keys():
delete_rep_table[dnstr] = n_rep
# Now perform the scan of replicas we'll need
# and compare any current repsFrom against the
# connections
for dnstr, n_rep in needed_rep_table.items():
# load any repsFrom and fsmo roles as we'll
# need them during connection translation
n_rep.load_repsFrom(self.samdb)
n_rep.load_fsmo_roles(self.samdb)
# Loop thru the existing repsFrom tupples (if any)
for i, t_repsFrom in enumerate(n_rep.rep_repsFrom):
# for each tuple t in n!repsFrom, let s be the nTDSDSA
# object such that s!objectGUID = t.uuidDsa
guidstr = str(t_repsFrom.source_dsa_obj_guid)
s_dsa = self.get_dsa_by_guidstr(guidstr)
# Source dsa is gone from config (strange)
# so cleanup stale repsFrom for unlisted DSA
if s_dsa is None:
logger.debug("repsFrom source DSA guid (%s) not found" %
guidstr)
t_repsFrom.to_be_deleted = True
continue
s_dnstr = s_dsa.dsa_dnstr
# Retrieve my DSAs connection object (if it exists)
# that specifies the fromServer equivalent to
# the DSA that is specified in the repsFrom source
cn_conn = self.my_dsa.get_connection_by_from_dnstr(s_dnstr)
# Let (cn) be the nTDSConnection object such that (cn)
# is a child of the local DC's nTDSDSA object and
# (cn!fromServer = s) and (cn!options) does not contain
# NTDSCONN_OPT_RODC_TOPOLOGY or NULL if no such (cn) exists.
if cn_conn and cn_conn.is_rodc_topology():
cn_conn = None
# KCC removes this repsFrom tuple if any of the following
# is true:
# cn = NULL.
#
# No NC replica of the NC "is present" on DSA that
# would be source of replica
#
# A writable replica of the NC "should be present" on
# the local DC, but a partial replica "is present" on
# the source DSA
s_rep = s_dsa.get_current_replica(n_rep.nc_dnstr)
if cn_conn is None or \
s_rep is None or not s_rep.is_present() or \
(not n_rep.is_ro() and s_rep.is_partial()):
t_repsFrom.to_be_deleted = True
continue
# If the KCC did not remove t from n!repsFrom, it updates t
self.modify_repsFrom(n_rep, t_repsFrom, s_rep, s_dsa, cn_conn)
# Loop thru connections and add implied repsFrom tuples
# for each NTDSConnection under our local DSA if the
# repsFrom is not already present
for cn_dnstr, cn_conn in self.my_dsa.connect_table.items():
implied, s_dsa = self.is_repsFrom_implied(n_rep, cn_conn)
if not implied:
continue
# Loop thru the existing repsFrom tupples (if any) and
# if we already have a tuple for this connection then
# no need to proceed to add. It will have been changed
# to have the correct attributes above
for i, t_repsFrom in enumerate(n_rep.rep_repsFrom):
guidstr = str(t_repsFrom.source_dsa_obj_guid)
if s_dsa is self.get_dsa_by_guidstr(guidstr):
s_dsa = None
break
if s_dsa is None:
continue
# Create a new RepsFromTo and proceed to modify
# it according to specification
t_repsFrom = RepsFromTo(n_rep.nc_dnstr)
t_repsFrom.source_dsa_obj_guid = s_dsa.dsa_guid
self.modify_repsFrom(n_rep, t_repsFrom, s_rep, s_dsa, cn_conn)
# Add to our NC repsFrom as this is newly computed
if t_repsFrom.is_modified():
n_rep.rep_repsFrom.append(t_repsFrom)
if opts.readonly:
# Display any to be deleted or modified repsFrom
text = n_rep.dumpstr_to_be_deleted()
if text:
logger.info("TO BE DELETED:\n%s" % text)
text = n_rep.dumpstr_to_be_modified()
if text:
logger.info("TO BE MODIFIED:\n%s" % text)
# Peform deletion from our tables but perform
# no database modification
n_rep.commit_repsFrom(self.samdb, ro=True)
else:
# Commit any modified repsFrom to the NC replica
n_rep.commit_repsFrom(self.samdb)
def keep_connection(self, cn_conn):
"""Determines if the connection is meant to be kept during the
pruning of unneeded connections operation.
Consults the keep_connection_list[] which was built during
intersite NC replica graph computation.
::returns (True or False): if (True) connection should not be pruned
"""
if cn_conn in self.keep_connection_list:
return True
return False
def merge_failed_links(self):
"""Merge of kCCFailedLinks and kCCFailedLinks from bridgeheads.
The KCC on a writable DC attempts to merge the link and connection
failure information from bridgehead DCs in its own site to help it
identify failed bridgehead DCs.
"""
# MS-TECH Ref 6.2.2.3.2 Merge of kCCFailedLinks and kCCFailedLinks
# from Bridgeheads
# XXX - not implemented yet
def setup_graph(self):
"""Set up a GRAPH, populated with a VERTEX for each site
object, a MULTIEDGE for each siteLink object, and a
MUTLIEDGESET for each siteLinkBridge object (or implied
siteLinkBridge).
::returns: a new graph
"""
# XXX - not implemented yet
return None
def get_bridgehead(self, site, part, transport, partial_ok, detect_failed):
"""Get a bridghead DC.
:param site: site object representing for which a bridgehead
DC is desired.
:param part: crossRef for NC to replicate.
:param transport: interSiteTransport object for replication
traffic.
:param partial_ok: True if a DC containing a partial
replica or a full replica will suffice, False if only
a full replica will suffice.
:param detect_failed: True to detect failed DCs and route
replication traffic around them, False to assume no DC
has failed.
::returns: dsa object for the bridgehead DC or None
"""
bhs = self.get_all_bridgeheads(site, part, transport,
partial_ok, detect_failed)
if len(bhs) == 0:
logger.debug("get_bridgehead: exit\n\tsitedn=%s\n\tbhdn=None" %
site.site_dnstr)
return None
else:
logger.debug("get_bridgehead: exit\n\tsitedn=%s\n\tbhdn=%s" %
(site.site_dnstr, bhs[0].dsa_dnstr))
return bhs[0]
def get_all_bridgeheads(self, site, part, transport,
partial_ok, detect_failed):
"""Get all bridghead DCs satisfying the given criteria
:param site: site object representing the site for which
bridgehead DCs are desired.
:param part: partition for NC to replicate.
:param transport: interSiteTransport object for
replication traffic.
:param partial_ok: True if a DC containing a partial
replica or a full replica will suffice, False if
only a full replica will suffice.
:param detect_ok: True to detect failed DCs and route
replication traffic around them, FALSE to assume
no DC has failed.
::returns: list of dsa object for available bridgehead
DCs or None
"""
bhs = []
logger.debug("get_all_bridgeheads: %s" % transport)
for key, dsa in site.dsa_table.items():
pdnstr = dsa.get_parent_dnstr()
# IF t!bridgeheadServerListBL has one or more values and
# t!bridgeheadServerListBL does not contain a reference
# to the parent object of dc then skip dc
if (len(transport.bridgehead_list) != 0 and
pdnstr not in transport.bridgehead_list):
continue
# IF dc is in the same site as the local DC
# IF a replica of cr!nCName is not in the set of NC replicas
# that "should be present" on dc or a partial replica of the
# NC "should be present" but partialReplicasOkay = FALSE
# Skip dc
if self.my_site.same_site(dsa):
needed, ro, partial = part.should_be_present(dsa)
if not needed or (partial and not partial_ok):
continue
# ELSE
# IF an NC replica of cr!nCName is not in the set of NC
# replicas that "are present" on dc or a partial replica of
# the NC "is present" but partialReplicasOkay = FALSE
# Skip dc
else:
rep = dsa.get_current_replica(part.nc_dnstr)
if rep is None or (rep.is_partial() and not partial_ok):
continue
# IF AmIRODC() and cr!nCName corresponds to default NC then
# Let dsaobj be the nTDSDSA object of the dc
# IF dsaobj.msDS-Behavior-Version < DS_BEHAVIOR_WIN2008
# Skip dc
if self.my_dsa.is_ro() and part.is_default():
if not dsa.is_minimum_behavior(DS_BEHAVIOR_WIN2008):
continue
# IF t!name != "IP" and the parent object of dc has no value for
# the attribute specified by t!transportAddressAttribute
# Skip dc
if transport.name != "IP":
# MS tech specification says we retrieve the named
# attribute in "transportAddressAttribute" from the parent
# of the DSA object
try:
attrs = [ transport.address_attr ]
res = self.samdb.search(base=pdnstr, scope=ldb.SCOPE_BASE,
attrs=attrs)
except ldb.ldbError, (enum, estr):
continue
msg = res[0]
nastr = str(msg[transport.address_attr][0])
# IF BridgeheadDCFailed(dc!objectGUID, detectFailedDCs) = TRUE
# Skip dc
if self.is_bridgehead_failed(dsa, detect_failed):
continue
logger.debug("get_all_bridgeheads: dsadn=%s" % dsa.dsa_dnstr)
bhs.append(dsa)
# IF bit NTDSSETTINGS_OPT_IS_RAND_BH_SELECTION_DISABLED is set in
# s!options
# SORT bhs such that all GC servers precede DCs that are not GC
# servers, and otherwise by ascending objectGUID
# ELSE
# SORT bhs in a random order
if site.is_random_bridgehead_disabled():
bhs.sort(sort_dsa_by_gc_and_guid)
else:
random.shuffle(bhs)
return bhs
def is_bridgehead_failed(self, dsa, detect_failed):
"""Determine whether a given DC is known to be in a failed state
::returns: True if and only if the DC should be considered failed
"""
# XXX - not implemented yet
return False
def create_connection(self, part, rbh, rsite, transport,
lbh, lsite, link_opt, link_sched,
partial_ok, detect_failed):
"""Create an nTDSConnection object with the given parameters
if one does not already exist.
:param part: crossRef object for the NC to replicate.
:param rbh: nTDSDSA object for DC to act as the
IDL_DRSGetNCChanges server (which is in a site other
than the local DC's site).
:param rsite: site of the rbh
:param transport: interSiteTransport object for the transport
to use for replication traffic.
:param lbh: nTDSDSA object for DC to act as the
IDL_DRSGetNCChanges client (which is in the local DC's site).
:param lsite: site of the lbh
:param link_opt: Replication parameters (aggregated siteLink options, etc.)
:param link_sched: Schedule specifying the times at which
to begin replicating.
:partial_ok: True if bridgehead DCs containing partial
replicas of the NC are acceptable.
:param detect_failed: True to detect failed DCs and route
replication traffic around them, FALSE to assume no DC
has failed.
"""
rbhs_all = self.get_all_bridgeheads(rsite, part, transport,
partial_ok, False)
# MS-TECH says to compute rbhs_avail but then doesn't use it
# rbhs_avail = self.get_all_bridgeheads(rsite, part, transport,
# partial_ok, detect_failed)
lbhs_all = self.get_all_bridgeheads(lsite, part, transport,
partial_ok, False)
# MS-TECH says to compute lbhs_avail but then doesn't use it
# lbhs_avail = self.get_all_bridgeheads(lsite, part, transport,
# partial_ok, detect_failed)
# FOR each nTDSConnection object cn such that the parent of cn is
# a DC in lbhsAll and cn!fromServer references a DC in rbhsAll
for ldsa in lbhs_all:
for cn in ldsa.connect_table.values():
rdsa = None
for rdsa in rbhs_all:
if cn.from_dnstr == rdsa.dsa_dnstr:
break
if rdsa is None:
continue
# IF bit NTDSCONN_OPT_IS_GENERATED is set in cn!options and
# NTDSCONN_OPT_RODC_TOPOLOGY is clear in cn!options and
# cn!transportType references t
if (cn.is_generated() and not cn.is_rodc_topology() and
cn.transport_dnstr == transport.dnstr):
# IF bit NTDSCONN_OPT_USER_OWNED_SCHEDULE is clear in
# cn!options and cn!schedule != sch
# Perform an originating update to set cn!schedule to
# sched
if (not cn.is_user_owned_schedule() and
not cn.is_equivalent_schedule(link_sched)):
cn.schedule = link_sched
cn.set_modified(True)
# IF bits NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT and
# NTDSCONN_OPT_USE_NOTIFY are set in cn
if cn.is_override_notify_default() and \
cn.is_use_notify():
# IF bit NTDSSITELINK_OPT_USE_NOTIFY is clear in
# ri.Options
# Perform an originating update to clear bits
# NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT and
# NTDSCONN_OPT_USE_NOTIFY in cn!options
if (link_opt & dsdb.NTDSSITELINK_OPT_USE_NOTIFY) == 0:
cn.options &= \
~(dsdb.NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT |
dsdb.NTDSCONN_OPT_USE_NOTIFY)
cn.set_modified(True)
# ELSE
else:
# IF bit NTDSSITELINK_OPT_USE_NOTIFY is set in
# ri.Options
# Perform an originating update to set bits
# NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT and
# NTDSCONN_OPT_USE_NOTIFY in cn!options
if (link_opt & dsdb.NTDSSITELINK_OPT_USE_NOTIFY) != 0:
cn.options |= \
(dsdb.NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT |
dsdb.NTDSCONN_OPT_USE_NOTIFY)
cn.set_modified(True)
# IF bit NTDSCONN_OPT_TWOWAY_SYNC is set in cn!options
if cn.is_twoway_sync():
# IF bit NTDSSITELINK_OPT_TWOWAY_SYNC is clear in
# ri.Options
# Perform an originating update to clear bit
# NTDSCONN_OPT_TWOWAY_SYNC in cn!options
if (link_opt & dsdb.NTDSSITELINK_OPT_TWOWAY_SYNC) == 0:
cn.options &= ~dsdb.NTDSCONN_OPT_TWOWAY_SYNC
cn.set_modified(True)
# ELSE
else:
# IF bit NTDSSITELINK_OPT_TWOWAY_SYNC is set in
# ri.Options
# Perform an originating update to set bit
# NTDSCONN_OPT_TWOWAY_SYNC in cn!options
if (link_opt & dsdb.NTDSSITELINK_OPT_TWOWAY_SYNC) != 0:
cn.options |= dsdb.NTDSCONN_OPT_TWOWAY_SYNC
cn.set_modified(True)
# IF bit NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION is set
# in cn!options
if cn.is_intersite_compression_disabled():
# IF bit NTDSSITELINK_OPT_DISABLE_COMPRESSION is clear
# in ri.Options
# Perform an originating update to clear bit
# NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION in
# cn!options
if (link_opt &
dsdb.NTDSSITELINK_OPT_DISABLE_COMPRESSION) == 0:
cn.options &= \
~dsdb.NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION
cn.set_modified(True)
# ELSE
else:
# IF bit NTDSSITELINK_OPT_DISABLE_COMPRESSION is set in
# ri.Options
# Perform an originating update to set bit
# NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION in
# cn!options
if (link_opt &
dsdb.NTDSSITELINK_OPT_DISABLE_COMPRESSION) != 0:
cn.options |= \
dsdb.NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION
cn.set_modified(True)
# Display any modified connection
if opts.readonly:
if cn.to_be_modified:
logger.info("TO BE MODIFIED:\n%s" % cn)
ldsa.commit_connections(self.samdb, ro=True)
else:
ldsa.commit_connections(self.samdb)
# ENDFOR
valid_connections = 0
# FOR each nTDSConnection object cn such that cn!parent is
# a DC in lbhsAll and cn!fromServer references a DC in rbhsAll
for ldsa in lbhs_all:
for cn in ldsa.connect_table.values():
rdsa = None
for rdsa in rbhs_all:
if cn.from_dnstr == rdsa.dsa_dnstr:
break
if rdsa is None:
continue
# IF (bit NTDSCONN_OPT_IS_GENERATED is clear in cn!options or
# cn!transportType references t) and
# NTDSCONN_OPT_RODC_TOPOLOGY is clear in cn!options
if ((not cn.is_generated() or
cn.transport_dnstr == transport.dnstr) and
not cn.is_rodc_topology()):
# LET rguid be the objectGUID of the nTDSDSA object
# referenced by cn!fromServer
# LET lguid be (cn!parent)!objectGUID
# IF BridgeheadDCFailed(rguid, detectFailedDCs) = FALSE and
# BridgeheadDCFailed(lguid, detectFailedDCs) = FALSE
# Increment cValidConnections by 1
if (not self.is_bridgehead_failed(rdsa, detect_failed) and
not self.is_bridgehead_failed(ldsa, detect_failed)):
valid_connections += 1
# IF keepConnections does not contain cn!objectGUID
# APPEND cn!objectGUID to keepConnections
if not self.keep_connection(cn):
self.keep_connection_list.append(cn)
# ENDFOR
# IF cValidConnections = 0
if valid_connections == 0:
# LET opt be NTDSCONN_OPT_IS_GENERATED
opt = dsdb.NTDSCONN_OPT_IS_GENERATED
# IF bit NTDSSITELINK_OPT_USE_NOTIFY is set in ri.Options
# SET bits NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT and
# NTDSCONN_OPT_USE_NOTIFY in opt
if (link_opt & dsdb.NTDSSITELINK_OPT_USE_NOTIFY) != 0:
opt |= (dsdb.NTDSCONN_OPT_OVERRIDE_NOTIFY_DEFAULT |
dsdb.NTDSCONN_USE_NOTIFY)
# IF bit NTDSSITELINK_OPT_TWOWAY_SYNC is set in ri.Options
# SET bit NTDSCONN_OPT_TWOWAY_SYNC opt
if (link_opt & dsdb.NTDSSITELINK_OPT_TWOWAY_SYNC) != 0:
opt |= dsdb.NTDSCONN_OPT_TWOWAY_SYNC
# IF bit NTDSSITELINK_OPT_DISABLE_COMPRESSION is set in
# ri.Options
# SET bit NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION in opt
if (link_opt &
dsdb.NTDSSITELINK_OPT_DISABLE_COMPRESSION) != 0:
opt |= dsdb.NTDSCONN_OPT_DISABLE_INTERSITE_COMPRESSION
# Perform an originating update to create a new nTDSConnection
# object cn that is a child of lbh, cn!enabledConnection = TRUE,
# cn!options = opt, cn!transportType is a reference to t,
# cn!fromServer is a reference to rbh, and cn!schedule = sch
cn = lbh.new_connection(opt, 0, transport, lbh.dsa_dnstr, link_sched)
# Display any added connection
if opts.readonly:
if cn.to_be_added:
logger.info("TO BE ADDED:\n%s" % cn)
lbh.commit_connections(self.samdb, ro=True)
else:
lbh.commit_connections(self.samdb)
# APPEND cn!objectGUID to keepConnections
if not self.keep_connection(cn):
self.keep_connection_list.append(cn)
def create_connections(self, graph, part, detect_failed):
"""Construct an NC replica graph for the NC identified by
the given crossRef, then create any additional nTDSConnection
objects required.
:param graph: site graph.
:param part: crossRef object for NC.
:param detect_failed: True to detect failed DCs and route
replication traffic around them, False to assume no DC
has failed.
Modifies self.keep_connection_list by adding any connections
deemed to be "in use".
::returns: (all_connected, found_failed_dc)
(all_connected) True if the resulting NC replica graph
connects all sites that need to be connected.
(found_failed_dc) True if one or more failed DCs were
detected.
"""
all_connected = True
found_failed = False
logger.debug("create_connections(): enter\n\tpartdn=%s\n\tdetect_failed=%s" %
(part.nc_dnstr, detect_failed))
# XXX - This is a highly abbreviated function from the MS-TECH
# ref. It creates connections between bridgeheads to all
# sites that have appropriate replicas. Thus we are not
# creating a minimum cost spanning tree but instead
# producing a fully connected tree. This should produce
# a full (albeit not optimal cost) replication topology.
my_vertex = Vertex(self.my_site, part)
my_vertex.color_vertex()
# No NC replicas for this NC in the site of the local DC,
# so no nTDSConnection objects need be created
if my_vertex.is_white():
return all_connected, found_failed
# LET partialReplicaOkay be TRUE if and only if
# localSiteVertex.Color = COLOR.BLACK
if my_vertex.is_black():
partial_ok = True
else:
partial_ok = False
# Utilize the IP transport only for now
transport = None
for transport in self.transport_table.values():
if transport.name == "IP":
break
if transport is None:
raise Exception("Unable to find inter-site transport for IP")
for rsite in self.site_table.values():
# We don't make connections to our own site as that
# is intrasite topology generator's job
if rsite is self.my_site:
continue
# Determine bridgehead server in remote site
rbh = self.get_bridgehead(rsite, part, transport,
partial_ok, detect_failed)
# RODC acts as an BH for itself
# IF AmIRODC() then
# LET lbh be the nTDSDSA object of the local DC
# ELSE
# LET lbh be the result of GetBridgeheadDC(localSiteVertex.ID,
# cr, t, partialReplicaOkay, detectFailedDCs)
if self.my_dsa.is_ro():
lsite = self.my_site
lbh = self.my_dsa
else:
lsite = self.my_site
lbh = self.get_bridgehead(lsite, part, transport,
partial_ok, detect_failed)
# Find the siteLink object that enumerates the connection
# between the two sites if it is present
sitelink = self.get_sitelink(lsite.site_dnstr, rsite.site_dnstr)
if sitelink is None:
link_opt = 0x0
link_sched = None
else:
link_opt = sitelink.options
link_sched = sitelink.schedule
self.create_connection(part, rbh, rsite, transport,
lbh, lsite, link_opt, link_sched,
partial_ok, detect_failed)
return all_connected, found_failed
def create_intersite_connections(self):
"""Computes an NC replica graph for each NC replica that "should be
present" on the local DC or "is present" on any DC in the same site
as the local DC. For each edge directed to an NC replica on such a
DC from an NC replica on a DC in another site, the KCC creates an
nTDSConnection object to imply that edge if one does not already
exist.
Modifies self.keep_connection_list - A list of nTDSConnection
objects for edges that are directed
to the local DC's site in one or more NC replica graphs.
returns: True if spanning trees were created for all NC replica
graphs, otherwise False.
"""
all_connected = True
self.keep_connection_list = []
# LET crossRefList be the set containing each object o of class
# crossRef such that o is a child of the CN=Partitions child of the
# config NC
# FOR each crossRef object cr in crossRefList
# IF cr!enabled has a value and is false, or if FLAG_CR_NTDS_NC
# is clear in cr!systemFlags, skip cr.
# LET g be the GRAPH return of SetupGraph()
for part in self.part_table.values():
if not part.is_enabled():
continue
if part.is_foreign():
continue
graph = self.setup_graph()
# Create nTDSConnection objects, routing replication traffic
# around "failed" DCs.
found_failed = False
connected, found_failed = self.create_connections(graph, part, True)
if not connected:
all_connected = False
if found_failed:
# One or more failed DCs preclude use of the ideal NC
# replica graph. Add connections for the ideal graph.
self.create_connections(graph, part, False)
return all_connected
def intersite(self):
"""The head method for generating the inter-site KCC replica
connection graph and attendant nTDSConnection objects
in the samdb.
Produces self.keep_connection_list[] of NTDS Connections
that should be kept during subsequent pruning process.
::return (True or False): (True) if the produced NC replica
graph connects all sites that need to be connected
"""
# Retrieve my DSA
mydsa = self.my_dsa
mysite = self.my_site
all_connected = True
logger.debug("intersite(): enter")
# Determine who is the ISTG
if opts.readonly:
mysite.select_istg(self.samdb, mydsa, ro=True)
else:
mysite.select_istg(self.samdb, mydsa, ro=False)
# Test whether local site has topology disabled
if mysite.is_intersite_topology_disabled():
logger.debug("intersite(): exit disabled all_connected=%d" %
all_connected)
return all_connected
if not mydsa.is_istg():
logger.debug("intersite(): exit not istg all_connected=%d" %
all_connected)
return all_connected
self.merge_failed_links()
# For each NC with an NC replica that "should be present" on the
# local DC or "is present" on any DC in the same site as the
# local DC, the KCC constructs a site graph--a precursor to an NC
# replica graph. The site connectivity for a site graph is defined
# by objects of class interSiteTransport, siteLink, and
# siteLinkBridge in the config NC.
all_connected = self.create_intersite_connections()
logger.debug("intersite(): exit all_connected=%d" % all_connected)
return all_connected
def update_rodc_connection(self):
"""Runs when the local DC is an RODC and updates the RODC NTFRS
connection object.
"""
# Given an nTDSConnection object cn1, such that cn1.options contains
# NTDSCONN_OPT_RODC_TOPOLOGY, and another nTDSConnection object cn2,
# does not contain NTDSCONN_OPT_RODC_TOPOLOGY, modify cn1 to ensure
# that the following is true:
#
# cn1.fromServer = cn2.fromServer
# cn1.schedule = cn2.schedule
#
# If no such cn2 can be found, cn1 is not modified.
# If no such cn1 can be found, nothing is modified by this task.
# XXX - not implemented yet
def intrasite_max_node_edges(self, node_count):
"""Returns the maximum number of edges directed to a node in
the intrasite replica graph.
The KCC does not create more
than 50 edges directed to a single DC. To optimize replication,
we compute that each node should have n+2 total edges directed
to it such that (n) is the smallest non-negative integer
satisfying (node_count <= 2*(n*n) + 6*n + 7)
:param node_count: total number of nodes in the replica graph
"""
n = 0
while True:
if node_count <= (2 * (n * n) + (6 * n) + 7):
break
n = n + 1
n = n + 2
if n < 50:
return n
return 50
def construct_intrasite_graph(self, site_local, dc_local,
nc_x, gc_only, detect_stale):
# We're using the MS notation names here to allow
# correlation back to the published algorithm.
#
# nc_x - naming context (x) that we are testing if it
# "should be present" on the local DC
# f_of_x - replica (f) found on a DC (s) for NC (x)
# dc_s - DC where f_of_x replica was found
# dc_local - local DC that potentially needs a replica
# (f_of_x)
# r_list - replica list R
# p_of_x - replica (p) is partial and found on a DC (s)
# for NC (x)
# l_of_x - replica (l) is the local replica for NC (x)
# that should appear on the local DC
# r_len = is length of replica list |R|
#
# If the DSA doesn't need a replica for this
# partition (NC x) then continue
needed, ro, partial = nc_x.should_be_present(dc_local)
logger.debug("construct_intrasite_graph(): enter" +
"\n\tgc_only=%d" % gc_only +
"\n\tdetect_stale=%d" % detect_stale +
"\n\tneeded=%s" % needed +
"\n\tro=%s" % ro +
"\n\tpartial=%s" % partial +
"\n%s" % nc_x)
if not needed:
return
# Create a NCReplica that matches what the local replica
# should say. We'll use this below in our r_list
l_of_x = NCReplica(dc_local.dsa_dnstr, dc_local.dsa_guid,
nc_x.nc_dnstr)
l_of_x.identify_by_basedn(self.samdb)
l_of_x.rep_partial = partial
l_of_x.rep_ro = ro
# Add this replica that "should be present" to the
# needed replica table for this DSA
dc_local.add_needed_replica(l_of_x)
# Empty replica sequence list
r_list = []
# We'll loop thru all the DSAs looking for
# writeable NC replicas that match the naming
# context dn for (nc_x)
#
for dc_s_dn, dc_s in self.my_site.dsa_table.items():
# If this partition (nc_x) doesn't appear as a
# replica (f_of_x) on (dc_s) then continue
if not nc_x.nc_dnstr in dc_s.current_rep_table.keys():
continue
# Pull out the NCReplica (f) of (x) with the dn
# that matches NC (x) we are examining.
f_of_x = dc_s.current_rep_table[nc_x.nc_dnstr]
# Replica (f) of NC (x) must be writable
if f_of_x.is_ro():
continue
# Replica (f) of NC (x) must satisfy the
# "is present" criteria for DC (s) that
# it was found on
if not f_of_x.is_present():
continue
# DC (s) must be a writable DSA other than
# my local DC. In other words we'd only replicate
# from other writable DC
if dc_s.is_ro() or dc_s is dc_local:
continue
# Certain replica graphs are produced only
# for global catalogs, so test against
# method input parameter
if gc_only and not dc_s.is_gc():
continue
# DC (s) must be in the same site as the local DC
# as this is the intra-site algorithm. This is
# handled by virtue of placing DSAs in per
# site objects (see enclosing for() loop)
# If NC (x) is intended to be read-only full replica
# for a domain NC on the target DC then the source
# DC should have functional level at minimum WIN2008
#
# Effectively we're saying that in order to replicate
# to a targeted RODC (which was introduced in Windows 2008)
# then we have to replicate from a DC that is also minimally
# at that level.
#
# You can also see this requirement in the MS special
# considerations for RODC which state that to deploy
# an RODC, at least one writable domain controller in
# the domain must be running Windows Server 2008
if ro and not partial and nc_x.nc_type == NCType.domain:
if not dc_s.is_minimum_behavior(DS_BEHAVIOR_WIN2008):
continue
# If we haven't been told to turn off stale connection
# detection and this dsa has a stale connection then
# continue
if detect_stale and self.is_stale_link_connection(dc_s):
continue
# Replica meets criteria. Add it to table indexed
# by the GUID of the DC that it appears on
r_list.append(f_of_x)
# If a partial (not full) replica of NC (x) "should be present"
# on the local DC, append to R each partial replica (p of x)
# such that p "is present" on a DC satisfying the same
# criteria defined above for full replica DCs.
if partial:
# Now we loop thru all the DSAs looking for
# partial NC replicas that match the naming
# context dn for (NC x)
for dc_s_dn, dc_s in self.my_site.dsa_table.items():
# If this partition NC (x) doesn't appear as a
# replica (p) of NC (x) on the dsa DC (s) then
# continue
if not nc_x.nc_dnstr in dc_s.current_rep_table.keys():
continue
# Pull out the NCReplica with the dn that
# matches NC (x) we are examining.
p_of_x = dsa.current_rep_table[nc_x.nc_dnstr]
# Replica (p) of NC (x) must be partial
if not p_of_x.is_partial():
continue
# Replica (p) of NC (x) must satisfy the
# "is present" criteria for DC (s) that
# it was found on
if not p_of_x.is_present():
continue
# DC (s) must be a writable DSA other than
# my DSA. In other words we'd only replicate
# from other writable DSA
if dc_s.is_ro() or dc_s is dc_local:
continue
# Certain replica graphs are produced only
# for global catalogs, so test against
# method input parameter
if gc_only and not dc_s.is_gc():
continue
# DC (s) must be in the same site as the local DC
# as this is the intra-site algorithm. This is
# handled by virtue of placing DSAs in per
# site objects (see enclosing for() loop)
# This criteria is moot (a no-op) for this case
# because we are scanning for (partial = True). The
# MS algorithm statement says partial replica scans
# should adhere to the "same" criteria as full replica
# scans so the criteria doesn't change here...its just
# rendered pointless.
#
# The case that is occurring would be a partial domain
# replica is needed on a local DC global catalog. There
# is no minimum windows behavior for those since GCs
# have always been present.
if ro and not partial and nc_x.nc_type == NCType.domain:
if not dc_s.is_minimum_behavior(DS_BEHAVIOR_WIN2008):
continue
# If we haven't been told to turn off stale connection
# detection and this dsa has a stale connection then
# continue
if detect_stale and self.is_stale_link_connection(dc_s):
continue
# Replica meets criteria. Add it to table indexed
# by the GUID of the DSA that it appears on
r_list.append(p_of_x)
# Append to R the NC replica that "should be present"
# on the local DC
r_list.append(l_of_x)
r_list.sort(sort_replica_by_dsa_guid)
r_len = len(r_list)
max_node_edges = self.intrasite_max_node_edges(r_len)
# Add a node for each r_list element to the replica graph
graph_list = []
for rep in r_list:
node = GraphNode(rep.rep_dsa_dnstr, max_node_edges)
graph_list.append(node)
# For each r(i) from (0 <= i < |R|-1)
i = 0
while i < (r_len-1):
# Add an edge from r(i) to r(i+1) if r(i) is a full
# replica or r(i+1) is a partial replica
if not r_list[i].is_partial() or r_list[i+1].is_partial():
graph_list[i+1].add_edge_from(r_list[i].rep_dsa_dnstr)
# Add an edge from r(i+1) to r(i) if r(i+1) is a full
# replica or ri is a partial replica.
if not r_list[i+1].is_partial() or r_list[i].is_partial():
graph_list[i].add_edge_from(r_list[i+1].rep_dsa_dnstr)
i = i + 1
# Add an edge from r|R|-1 to r0 if r|R|-1 is a full replica
# or r0 is a partial replica.
if not r_list[r_len-1].is_partial() or r_list[0].is_partial():
graph_list[0].add_edge_from(r_list[r_len-1].rep_dsa_dnstr)
# Add an edge from r0 to r|R|-1 if r0 is a full replica or
# r|R|-1 is a partial replica.
if not r_list[0].is_partial() or r_list[r_len-1].is_partial():
graph_list[r_len-1].add_edge_from(r_list[0].rep_dsa_dnstr)
# For each existing nTDSConnection object implying an edge
# from rj of R to ri such that j != i, an edge from rj to ri
# is not already in the graph, and the total edges directed
# to ri is less than n+2, the KCC adds that edge to the graph.
i = 0
while i < r_len:
dsa = self.my_site.dsa_table[graph_list[i].dsa_dnstr]
graph_list[i].add_edges_from_connections(dsa)
i = i + 1
i = 0
while i < r_len:
tnode = graph_list[i]
# To optimize replication latency in sites with many NC replicas, the
# KCC adds new edges directed to ri to bring the total edges to n+2,
# where the NC replica rk of R from which the edge is directed
# is chosen at random such that k != i and an edge from rk to ri
# is not already in the graph.
#
# Note that the KCC tech ref does not give a number for the definition
# of "sites with many NC replicas". At a bare minimum to satisfy
# n+2 edges directed at a node we have to have at least three replicas
# in |R| (i.e. if n is zero then at least replicas from two other graph
# nodes may direct edges to us).
if r_len >= 3:
# pick a random index
findex = rindex = random.randint(0, r_len-1)
# while this node doesn't have sufficient edges
while not tnode.has_sufficient_edges():
# If this edge can be successfully added (i.e. not
# the same node and edge doesn't already exist) then
# select a new random index for the next round
if tnode.add_edge_from(graph_list[rindex].dsa_dnstr):
findex = rindex = random.randint(0, r_len-1)
else:
# Otherwise continue looking against each node
# after the random selection
rindex = rindex + 1
if rindex >= r_len:
rindex = 0
if rindex == findex:
logger.error("Unable to satisfy max edge criteria!")
break
# Print the graph node in debug mode
logger.debug("%s" % tnode)
# For each edge directed to the local DC, ensure a nTDSConnection
# points to us that satisfies the KCC criteria
if graph_list[i].dsa_dnstr == dc_local.dsa_dnstr:
graph_list[i].add_connections_from_edges(dc_local)
i = i + 1
def intrasite(self):
"""The head method for generating the intra-site KCC replica
connection graph and attendant nTDSConnection objects
in the samdb
"""
# Retrieve my DSA
mydsa = self.my_dsa
logger.debug("intrasite(): enter")
# Test whether local site has topology disabled
mysite = self.site_table[self.my_site_dnstr]
if mysite.is_intrasite_topology_disabled():
return
detect_stale = (not mysite.is_detect_stale_disabled())
# Loop thru all the partitions.
for partdn, part in self.part_table.items():
self.construct_intrasite_graph(mysite, mydsa, part, False,
detect_stale)
# If the DC is a GC server, the KCC constructs an additional NC
# replica graph (and creates nTDSConnection objects) for the
# config NC as above, except that only NC replicas that "are present"
# on GC servers are added to R.
for partdn, part in self.part_table.items():
if part.is_config():
self.construct_intrasite_graph(mysite, mydsa, part, True,
detect_stale)
# The DC repeats the NC replica graph computation and nTDSConnection
# creation for each of the NC replica graphs, this time assuming
# that no DC has failed. It does so by re-executing the steps as
# if the bit NTDSSETTINGS_OPT_IS_TOPL_DETECT_STALE_DISABLED were
# set in the options attribute of the site settings object for
# the local DC's site. (ie. we set "detec_stale" flag to False)
# Loop thru all the partitions.
for partdn, part in self.part_table.items():
self.construct_intrasite_graph(mysite, mydsa, part, False,
False) # don't detect stale
# If the DC is a GC server, the KCC constructs an additional NC
# replica graph (and creates nTDSConnection objects) for the
# config NC as above, except that only NC replicas that "are present"
# on GC servers are added to R.
for partdn, part in self.part_table.items():
if part.is_config():
self.construct_intrasite_graph(mysite, mydsa, part, True,
False) # don't detect stale
if opts.readonly:
# Display any to be added or modified repsFrom
for dnstr, connect in mydsa.connect_table.items():
if connect.to_be_deleted:
logger.info("TO BE DELETED:\n%s" % connect)
if connect.to_be_modified:
logger.info("TO BE MODIFIED:\n%s" % connect)
if connect.to_be_added:
logger.info("TO BE ADDED:\n%s" % connect)
mydsa.commit_connections(self.samdb, ro=True)
else:
# Commit any newly created connections to the samdb
mydsa.commit_connections(self.samdb)
def run(self, dburl, lp, creds):
"""Method to perform a complete run of the KCC and
produce an updated topology for subsequent NC replica
syncronization between domain controllers
"""
# We may already have a samdb setup if we are
# currently importing an ldif for a test run
if self.samdb is None:
try:
self.samdb = SamDB(url=lp.samdb_url(),
session_info=system_session(),
credentials=creds, lp=lp)
except ldb.LdbError, (num, msg):
logger.error("Unable to open sam database %s : %s" %
(lp.samdb_url(), msg))
return 1
try:
# Setup
self.load_my_site()
self.load_my_dsa()
self.load_all_sites()
self.load_all_partitions()
self.load_all_transports()
self.load_all_sitelinks()
# These are the published steps (in order) for the
# MS-TECH description of the KCC algorithm
# Step 1
self.refresh_failed_links_connections()
# Step 2
self.intrasite()
# Step 3
all_connected = self.intersite()
# Step 4
self.remove_unneeded_ntdsconn(all_connected)
# Step 5
self.translate_ntdsconn()
# Step 6
self.remove_unneeded_failed_links_connections()
# Step 7
self.update_rodc_connection()
except Exception, estr:
logger.error("%s" % estr)
return 1
return 0
def import_ldif(self, dburl, lp, creds, ldif_file):
"""Routine to import all objects and attributes that are relevent
to the KCC algorithms from a previously exported LDIF file.
The point of this function is to allow a programmer/debugger to
import an LDIF file with non-security relevent information that
was previously extracted from a DC database. The LDIF file is used
to create a temporary abbreviated database. The KCC algorithm can
then run against this abbreviated database for debug or test
verification that the topology generated is computationally the
same between different OSes and algorithms.
:param dburl: path to the temporary abbreviated db to create
:param ldif_file: path to the ldif file to import
"""
if os.path.exists(dburl):
logger.error("Specify a database (%s) that doesn't already exist." %
dburl)
return 1
# Use ["modules:"] as we are attempting to build a sam
# database as opposed to start it here.
self.samdb = Ldb(url=dburl, session_info=system_session(),
lp=lp, options=["modules:"])
self.samdb.transaction_start()
try:
data = read_and_sub_file(ldif_file, None)
self.samdb.add_ldif(data, None)
except Exception, estr:
logger.error("%s" % estr)
self.samdb.transaction_cancel()
return 1
else:
self.samdb.transaction_commit()
self.samdb = None
# We have an abbreviated list of options here because we have built
# an abbreviated database. We use the rootdse and extended-dn
# modules only during this re-open
self.samdb = SamDB(url=dburl, session_info=system_session(),
credentials=creds, lp=lp,
options=["modules:rootdse,extended_dn_out_ldb"])
return 0
def export_ldif(self, dburl, lp, creds, ldif_file):
"""Routine to extract all objects and attributes that are relevent
to the KCC algorithms from a DC database.
The point of this function is to allow a programmer/debugger to
extract an LDIF file with non-security relevent information from
a DC database. The LDIF file can then be used to "import" via
the import_ldif() function this file into a temporary abbreviated
database. The KCC algorithm can then run against this abbreviated
database for debug or test verification that the topology generated
is computationally the same between different OSes and algorithms.
:param dburl: LDAP database URL to extract info from
:param ldif_file: output LDIF file name to create
"""
try:
self.samdb = SamDB(url=dburl,
session_info=system_session(),
credentials=creds, lp=lp)
except ldb.LdbError, (enum, estr):
logger.error("Unable to open sam database (%s) : %s" %
(lp.samdb_url(), estr))
return 1
if os.path.exists(ldif_file):
logger.error("Specify a file (%s) that doesn't already exist." %
ldif_file)
return 1
try:
f = open(ldif_file, "w")
except (enum, estr):
logger.error("Unable to open (%s) : %s" % (ldif_file, estr))
return 1
try:
# Query Partitions
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"objectSid",
"Enabled",
"systemFlags",
"dnsRoot",
"nCName",
"msDS-NC-Replica-Locations",
"msDS-NC-RO-Replica-Locations" ]
sstr = "CN=Partitions,%s" % self.samdb.get_config_basedn()
res = self.samdb.search(base=sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=crossRef)")
# Write partitions output
write_search_result(self.samdb, f, res)
# Query cross reference container
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"fSMORoleOwner",
"systemFlags",
"msDS-Behavior-Version",
"msDS-EnabledFeature" ]
sstr = "CN=Partitions,%s" % self.samdb.get_config_basedn()
res = self.samdb.search(base=sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=crossRefContainer)")
# Write cross reference container output
write_search_result(self.samdb, f, res)
# Query Sites
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"systemFlags" ]
sstr = "CN=Sites,%s" % self.samdb.get_config_basedn()
sites = self.samdb.search(base=sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=site)")
# Write sites output
write_search_result(self.samdb, f, sites)
# Query NTDS Site Settings
for msg in sites:
sitestr = str(msg.dn)
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"interSiteTopologyGenerator",
"interSiteTopologyFailover",
"schedule",
"options" ]
sstr = "CN=NTDS Site Settings,%s" % sitestr
res = self.samdb.search(base=sstr, scope=ldb.SCOPE_BASE,
attrs=attrs)
# Write Site Settings output
write_search_result(self.samdb, f, res)
# Naming context list
nclist = []
# Query Directory Service Agents
for msg in sites:
sstr = str(msg.dn)
ncattrs = [ "hasMasterNCs",
"msDS-hasMasterNCs",
"hasPartialReplicaNCs",
"msDS-HasDomainNCs",
"msDS-hasFullReplicaNCs",
"msDS-HasInstantiatedNCs" ]
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"invocationID",
"options",
"msDS-isRODC",
"msDS-Behavior-Version" ]
res = self.samdb.search(base=sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs + ncattrs,
expression="(objectClass=nTDSDSA)")
# Spin thru all the DSAs looking for NC replicas
# and build a list of all possible Naming Contexts
# for subsequent retrieval below
for msg in res:
for k in msg.keys():
if k in ncattrs:
for value in msg[k]:
# Some of these have binary DNs so
# use dsdb_Dn to split out relevent parts
dsdn = dsdb_Dn(self.samdb, value)
dnstr = str(dsdn.dn)
if dnstr not in nclist:
nclist.append(dnstr)
# Write DSA output
write_search_result(self.samdb, f, res)
# Query NTDS Connections
for msg in sites:
sstr = str(msg.dn)
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"options",
"whenCreated",
"enabledConnection",
"schedule",
"transportType",
"fromServer",
"systemFlags" ]
res = self.samdb.search(base=sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=nTDSConnection)")
# Write NTDS Connection output
write_search_result(self.samdb, f, res)
# Query Intersite transports
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"options",
"name",
"bridgeheadServerListBL",
"transportAddressAttribute" ]
sstr = "CN=Inter-Site Transports,CN=Sites,%s" % \
self.samdb.get_config_basedn()
res = self.samdb.search(sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=interSiteTransport)")
# Write inter-site transport output
write_search_result(self.samdb, f, res)
# Query siteLink
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"systemFlags",
"options",
"schedule",
"replInterval",
"siteList",
"cost" ]
sstr = "CN=Sites,%s" % \
self.samdb.get_config_basedn()
res = self.samdb.search(sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=siteLink)")
# Write siteLink output
write_search_result(self.samdb, f, res)
# Query siteLinkBridge
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"siteLinkList" ]
sstr = "CN=Sites,%s" % self.samdb.get_config_basedn()
res = self.samdb.search(sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=siteLinkBridge)")
# Write siteLinkBridge output
write_search_result(self.samdb, f, res)
# Query servers containers
# Needed for samdb.server_site_name()
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"systemFlags" ]
sstr = "CN=Sites,%s" % self.samdb.get_config_basedn()
res = self.samdb.search(sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=serversContainer)")
# Write servers container output
write_search_result(self.samdb, f, res)
# Query servers
# Needed because some transport interfaces refer back to
# attributes found in the server object. Also needed
# so extended-dn will be happy with dsServiceName in rootDSE
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"systemFlags",
"dNSHostName",
"mailAddress" ]
sstr = "CN=Sites,%s" % self.samdb.get_config_basedn()
res = self.samdb.search(sstr, scope=ldb.SCOPE_SUBTREE,
attrs=attrs,
expression="(objectClass=server)")
# Write server output
write_search_result(self.samdb, f, res)
# Query Naming Context replicas
attrs = [ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"objectSid",
"fSMORoleOwner",
"msDS-Behavior-Version",
"repsFrom",
"repsTo" ]
for sstr in nclist:
res = self.samdb.search(sstr, scope=ldb.SCOPE_BASE,
attrs=attrs)
# Write naming context output
write_search_result(self.samdb, f, res)
# Query rootDSE replicas
attrs=[ "objectClass",
"objectGUID",
"cn",
"whenChanged",
"rootDomainNamingContext",
"configurationNamingContext",
"schemaNamingContext",
"defaultNamingContext",
"dsServiceName" ]
sstr = ""
res = self.samdb.search(sstr, scope=ldb.SCOPE_BASE,
attrs=attrs)
# Record the rootDSE object as a dn as it
# would appear in the base ldb file. We have
# to save it this way because we are going to
# be importing as an abbreviated database.
res[0].dn = ldb.Dn(self.samdb, "@ROOTDSE")
# Write rootdse output
write_search_result(self.samdb, f, res)
except ldb.LdbError, (enum, estr):
logger.error("Error processing (%s) : %s" % (sstr, estr))
return 1
f.close()
return 0
##################################################
# Global Functions
##################################################
def sort_replica_by_dsa_guid(rep1, rep2):
return cmp(rep1.rep_dsa_guid, rep2.rep_dsa_guid)
def sort_dsa_by_gc_and_guid(dsa1, dsa2):
if dsa1.is_gc() and not dsa2.is_gc():
return -1
if not dsa1.is_gc() and dsa2.is_gc():
return +1
return cmp(dsa1.dsa_guid, dsa2.dsa_guid)
def is_smtp_replication_available():
"""Currently always returns false because Samba
doesn't implement SMTP transfer for NC changes
between DCs
"""
return False
def write_search_result(samdb, f, res):
for msg in res:
lstr = samdb.write_ldif(msg, ldb.CHANGETYPE_NONE)
f.write("%s" % lstr)
##################################################
# samba_kcc entry point
##################################################
parser = optparse.OptionParser("samba_kcc [options]")
sambaopts = options.SambaOptions(parser)
credopts = options.CredentialsOptions(parser)
parser.add_option_group(sambaopts)
parser.add_option_group(credopts)
parser.add_option_group(options.VersionOptions(parser))
parser.add_option("--readonly",
help="compute topology but do not update database",
action="store_true")
parser.add_option("--debug",
help="debug output",
action="store_true")
parser.add_option("--seed",
help="random number seed",
type=str, metavar="<number>")
parser.add_option("--importldif",
help="import topology ldif file",
type=str, metavar="<file>")
parser.add_option("--exportldif",
help="export topology ldif file",
type=str, metavar="<file>")
parser.add_option("-H", "--URL" ,
help="LDB URL for database or target server",
type=str, metavar="<URL>", dest="dburl")
parser.add_option("--tmpdb",
help="schemaless database file to create for ldif import",
type=str, metavar="<file>")
logger = logging.getLogger("samba_kcc")
logger.addHandler(logging.StreamHandler(sys.stdout))
lp = sambaopts.get_loadparm()
creds = credopts.get_credentials(lp, fallback_machine=True)
opts, args = parser.parse_args()
if opts.readonly is None:
opts.readonly = False
if opts.debug:
logger.setLevel(logging.DEBUG)
elif opts.readonly:
logger.setLevel(logging.INFO)
else:
logger.setLevel(logging.WARNING)
# initialize seed from optional input parameter
if opts.seed:
random.seed(int(opts.seed))
else:
random.seed(0xACE5CA11)
if opts.dburl is None:
opts.dburl = lp.samdb_url()
# Instantiate Knowledge Consistency Checker and perform run
kcc = KCC()
if opts.exportldif:
rc = kcc.export_ldif(opts.dburl, lp, creds, opts.exportldif)
sys.exit(rc)
if opts.importldif:
if opts.tmpdb is None or opts.tmpdb.startswith('ldap'):
logger.error("Specify a target temp database file with --tmpdb option.")
sys.exit(1)
rc = kcc.import_ldif(opts.tmpdb, lp, creds, opts.importldif)
if rc != 0:
sys.exit(rc)
rc = kcc.run(opts.dburl, lp, creds)
sys.exit(rc)
|