/* $NetBSD: rpz.c,v 1.11.2.2 2024/02/25 15:46:52 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /*! \file */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DNS_RPZ_ZONE_MAGIC ISC_MAGIC('r', 'p', 'z', ' ') #define DNS_RPZ_ZONES_MAGIC ISC_MAGIC('r', 'p', 'z', 's') #define DNS_RPZ_ZONE_VALID(rpz) ISC_MAGIC_VALID(rpz, DNS_RPZ_ZONE_MAGIC) #define DNS_RPZ_ZONES_VALID(rpzs) ISC_MAGIC_VALID(rpzs, DNS_RPZ_ZONES_MAGIC) /* * Parallel radix trees for databases of response policy IP addresses * * The radix or patricia trees are somewhat specialized to handle response * policy addresses by representing the two sets of IP addresses and name * server IP addresses in a single tree. One set of IP addresses is * for rpz-ip policies or policies triggered by addresses in A or * AAAA records in responses. * The second set is for rpz-nsip policies or policies triggered by addresses * in A or AAAA records for NS records that are authorities for responses. * * Each leaf indicates that an IP address is listed in the IP address or the * name server IP address policy sub-zone (or both) of the corresponding * response policy zone. The policy data such as a CNAME or an A record * is kept in the policy zone. After an IP address has been found in a radix * tree, the node in the policy zone's database is found by converting * the IP address to a domain name in a canonical form. * * * The response policy zone canonical form of an IPv6 address is one of: * prefix.W.W.W.W.W.W.W.W * prefix.WORDS.zz * prefix.WORDS.zz.WORDS * prefix.zz.WORDS * where * prefix is the prefix length of the IPv6 address between 1 and 128 * W is a number between 0 and 65535 * WORDS is one or more numbers W separated with "." * zz corresponds to :: in the standard IPv6 text representation * * The canonical form of IPv4 addresses is: * prefix.B.B.B.B * where * prefix is the prefix length of the address between 1 and 32 * B is a number between 0 and 255 * * Names for IPv4 addresses are distinguished from IPv6 addresses by having * 5 labels all of which are numbers, and a prefix between 1 and 32. */ /* * Nodes hashtable calculation parameters */ #define DNS_RPZ_HTSIZE_MAX 24 #define DNS_RPZ_HTSIZE_DIV 3 static isc_result_t dns__rpz_shuttingdown(dns_rpz_zones_t *rpzs); static void dns__rpz_timer_cb(isc_task_t *task, isc_event_t *event); /* * Use a private definition of IPv6 addresses because s6_addr32 is not * always defined and our IPv6 addresses are in non-standard byte order */ typedef uint32_t dns_rpz_cidr_word_t; #define DNS_RPZ_CIDR_WORD_BITS ((int)sizeof(dns_rpz_cidr_word_t) * 8) #define DNS_RPZ_CIDR_KEY_BITS ((int)sizeof(dns_rpz_cidr_key_t) * 8) #define DNS_RPZ_CIDR_WORDS (128 / DNS_RPZ_CIDR_WORD_BITS) typedef struct { dns_rpz_cidr_word_t w[DNS_RPZ_CIDR_WORDS]; } dns_rpz_cidr_key_t; #define ADDR_V4MAPPED 0xffff #define KEY_IS_IPV4(prefix, ip) \ ((prefix) >= 96 && (ip)->w[0] == 0 && (ip)->w[1] == 0 && \ (ip)->w[2] == ADDR_V4MAPPED) #define DNS_RPZ_WORD_MASK(b) \ ((b) == 0 ? (dns_rpz_cidr_word_t)(-1) \ : ((dns_rpz_cidr_word_t)(-1) \ << (DNS_RPZ_CIDR_WORD_BITS - (b)))) /* * Get bit #n from the array of words of an IP address. */ #define DNS_RPZ_IP_BIT(ip, n) \ (1 & ((ip)->w[(n) / DNS_RPZ_CIDR_WORD_BITS] >> \ (DNS_RPZ_CIDR_WORD_BITS - 1 - ((n) % DNS_RPZ_CIDR_WORD_BITS)))) /* * A triplet of arrays of bits flagging the existence of * client-IP, IP, and NSIP policy triggers. */ typedef struct dns_rpz_addr_zbits dns_rpz_addr_zbits_t; struct dns_rpz_addr_zbits { dns_rpz_zbits_t client_ip; dns_rpz_zbits_t ip; dns_rpz_zbits_t nsip; }; /* * A CIDR or radix tree node. */ struct dns_rpz_cidr_node { dns_rpz_cidr_node_t *parent; dns_rpz_cidr_node_t *child[2]; dns_rpz_cidr_key_t ip; dns_rpz_prefix_t prefix; dns_rpz_addr_zbits_t set; dns_rpz_addr_zbits_t sum; }; /* * A pair of arrays of bits flagging the existence of * QNAME and NSDNAME policy triggers. */ typedef struct dns_rpz_nm_zbits dns_rpz_nm_zbits_t; struct dns_rpz_nm_zbits { dns_rpz_zbits_t qname; dns_rpz_zbits_t ns; }; /* * The data in a RBT node has two pairs of bits for policy zones. * One pair is for the corresponding name of the node such as example.com * and the other pair is for a wildcard child such as *.example.com. */ typedef struct dns_rpz_nm_data dns_rpz_nm_data_t; struct dns_rpz_nm_data { dns_rpz_nm_zbits_t set; dns_rpz_nm_zbits_t wild; }; static isc_result_t rpz_add(dns_rpz_zone_t *rpz, const dns_name_t *src_name); static void rpz_del(dns_rpz_zone_t *rpz, const dns_name_t *src_name); const char * dns_rpz_type2str(dns_rpz_type_t type) { switch (type) { case DNS_RPZ_TYPE_CLIENT_IP: return ("CLIENT-IP"); case DNS_RPZ_TYPE_QNAME: return ("QNAME"); case DNS_RPZ_TYPE_IP: return ("IP"); case DNS_RPZ_TYPE_NSIP: return ("NSIP"); case DNS_RPZ_TYPE_NSDNAME: return ("NSDNAME"); case DNS_RPZ_TYPE_BAD: break; } FATAL_ERROR("impossible rpz type %d", type); return ("impossible"); } dns_rpz_policy_t dns_rpz_str2policy(const char *str) { static struct { const char *str; dns_rpz_policy_t policy; } tbl[] = { { "given", DNS_RPZ_POLICY_GIVEN }, { "disabled", DNS_RPZ_POLICY_DISABLED }, { "passthru", DNS_RPZ_POLICY_PASSTHRU }, { "drop", DNS_RPZ_POLICY_DROP }, { "tcp-only", DNS_RPZ_POLICY_TCP_ONLY }, { "nxdomain", DNS_RPZ_POLICY_NXDOMAIN }, { "nodata", DNS_RPZ_POLICY_NODATA }, { "cname", DNS_RPZ_POLICY_CNAME }, { "no-op", DNS_RPZ_POLICY_PASSTHRU }, /* old passthru */ }; unsigned int n; if (str == NULL) { return (DNS_RPZ_POLICY_ERROR); } for (n = 0; n < sizeof(tbl) / sizeof(tbl[0]); ++n) { if (!strcasecmp(tbl[n].str, str)) { return (tbl[n].policy); } } return (DNS_RPZ_POLICY_ERROR); } const char * dns_rpz_policy2str(dns_rpz_policy_t policy) { const char *str = NULL; switch (policy) { case DNS_RPZ_POLICY_PASSTHRU: str = "PASSTHRU"; break; case DNS_RPZ_POLICY_DROP: str = "DROP"; break; case DNS_RPZ_POLICY_TCP_ONLY: str = "TCP-ONLY"; break; case DNS_RPZ_POLICY_NXDOMAIN: str = "NXDOMAIN"; break; case DNS_RPZ_POLICY_NODATA: str = "NODATA"; break; case DNS_RPZ_POLICY_RECORD: str = "Local-Data"; break; case DNS_RPZ_POLICY_CNAME: case DNS_RPZ_POLICY_WILDCNAME: str = "CNAME"; break; case DNS_RPZ_POLICY_MISS: str = "MISS"; break; case DNS_RPZ_POLICY_DNS64: str = "DNS64"; break; case DNS_RPZ_POLICY_ERROR: str = "ERROR"; break; default: UNREACHABLE(); } return (str); } /* * Return the bit number of the highest set bit in 'zbit'. * (for example, 0x01 returns 0, 0xFF returns 7, etc.) */ static int zbit_to_num(dns_rpz_zbits_t zbit) { dns_rpz_num_t rpz_num; REQUIRE(zbit != 0); rpz_num = 0; if ((zbit & 0xffffffff00000000ULL) != 0) { zbit >>= 32; rpz_num += 32; } if ((zbit & 0xffff0000) != 0) { zbit >>= 16; rpz_num += 16; } if ((zbit & 0xff00) != 0) { zbit >>= 8; rpz_num += 8; } if ((zbit & 0xf0) != 0) { zbit >>= 4; rpz_num += 4; } if ((zbit & 0xc) != 0) { zbit >>= 2; rpz_num += 2; } if ((zbit & 2) != 0) { ++rpz_num; } return (rpz_num); } /* * Make a set of bit masks given one or more bits and their type. */ static void make_addr_set(dns_rpz_addr_zbits_t *tgt_set, dns_rpz_zbits_t zbits, dns_rpz_type_t type) { switch (type) { case DNS_RPZ_TYPE_CLIENT_IP: tgt_set->client_ip = zbits; tgt_set->ip = 0; tgt_set->nsip = 0; break; case DNS_RPZ_TYPE_IP: tgt_set->client_ip = 0; tgt_set->ip = zbits; tgt_set->nsip = 0; break; case DNS_RPZ_TYPE_NSIP: tgt_set->client_ip = 0; tgt_set->ip = 0; tgt_set->nsip = zbits; break; default: UNREACHABLE(); } } static void make_nm_set(dns_rpz_nm_zbits_t *tgt_set, dns_rpz_num_t rpz_num, dns_rpz_type_t type) { switch (type) { case DNS_RPZ_TYPE_QNAME: tgt_set->qname = DNS_RPZ_ZBIT(rpz_num); tgt_set->ns = 0; break; case DNS_RPZ_TYPE_NSDNAME: tgt_set->qname = 0; tgt_set->ns = DNS_RPZ_ZBIT(rpz_num); break; default: UNREACHABLE(); } } /* * Mark a node and all of its parents as having client-IP, IP, or NSIP data */ static void set_sum_pair(dns_rpz_cidr_node_t *cnode) { dns_rpz_addr_zbits_t sum; do { dns_rpz_cidr_node_t *child = cnode->child[0]; sum = cnode->set; if (child != NULL) { sum.client_ip |= child->sum.client_ip; sum.ip |= child->sum.ip; sum.nsip |= child->sum.nsip; } child = cnode->child[1]; if (child != NULL) { sum.client_ip |= child->sum.client_ip; sum.ip |= child->sum.ip; sum.nsip |= child->sum.nsip; } if (cnode->sum.client_ip == sum.client_ip && cnode->sum.ip == sum.ip && cnode->sum.nsip == sum.nsip) { break; } cnode->sum = sum; cnode = cnode->parent; } while (cnode != NULL); } /* Caller must hold rpzs->maint_lock */ static void fix_qname_skip_recurse(dns_rpz_zones_t *rpzs) { dns_rpz_zbits_t mask; /* * qname_wait_recurse and qname_skip_recurse are used to * implement the "qname-wait-recurse" config option. * * When "qname-wait-recurse" is yes, no processing happens without * recursion. In this case, qname_wait_recurse is true, and * qname_skip_recurse (a bit field indicating which policy zones * can be processed without recursion) is set to all 0's by * fix_qname_skip_recurse(). * * When "qname-wait-recurse" is no, qname_skip_recurse may be * set to a non-zero value by fix_qname_skip_recurse(). The mask * has to have bits set for the policy zones for which * processing may continue without recursion, and bits cleared * for the rest. * * (1) The ARM says: * * The "qname-wait-recurse no" option overrides that default * behavior when recursion cannot change a non-error * response. The option does not affect QNAME or client-IP * triggers in policy zones listed after other zones * containing IP, NSIP and NSDNAME triggers, because those may * depend on the A, AAAA, and NS records that would be found * during recursive resolution. * * Let's consider the following: * * zbits_req = (rpzs->have.ipv4 | rpzs->have.ipv6 | * rpzs->have.nsdname | * rpzs->have.nsipv4 | rpzs->have.nsipv6); * * zbits_req now contains bits set for zones which require * recursion. * * But going by the description in the ARM, if the first policy * zone requires recursion, then all zones after that (higher * order bits) have to wait as well. If the Nth zone requires * recursion, then (N+1)th zone onwards all need to wait. * * So mapping this, examples: * * zbits_req = 0b000 mask = 0xffffffff (no zones have to wait for * recursion) * zbits_req = 0b001 mask = 0x00000000 (all zones have to wait) * zbits_req = 0b010 mask = 0x00000001 (the first zone doesn't have to * wait, second zone onwards need * to wait) * zbits_req = 0b011 mask = 0x00000000 (all zones have to wait) * zbits_req = 0b100 mask = 0x00000011 (the 1st and 2nd zones don't * have to wait, third zone * onwards need to wait) * * More generally, we have to count the number of trailing 0 * bits in zbits_req and only these can be processed without * recursion. All the rest need to wait. * * (2) The ARM says that "qname-wait-recurse no" option * overrides the default behavior when recursion cannot change a * non-error response. So, in the order of listing of policy * zones, within the first policy zone where recursion may be * required, we should first allow CLIENT-IP and QNAME policy * records to be attempted without recursion. */ /* * Get a mask covering all policy zones that are not subordinate to * other policy zones containing triggers that require that the * qname be resolved before they can be checked. */ rpzs->have.client_ip = rpzs->have.client_ipv4 | rpzs->have.client_ipv6; rpzs->have.ip = rpzs->have.ipv4 | rpzs->have.ipv6; rpzs->have.nsip = rpzs->have.nsipv4 | rpzs->have.nsipv6; if (rpzs->p.qname_wait_recurse) { mask = 0; } else { dns_rpz_zbits_t zbits_req; dns_rpz_zbits_t zbits_notreq; dns_rpz_zbits_t mask2; dns_rpz_zbits_t req_mask; /* * Get the masks of zones with policies that * do/don't require recursion */ zbits_req = (rpzs->have.ipv4 | rpzs->have.ipv6 | rpzs->have.nsdname | rpzs->have.nsipv4 | rpzs->have.nsipv6); zbits_notreq = (rpzs->have.client_ip | rpzs->have.qname); if (zbits_req == 0) { mask = DNS_RPZ_ALL_ZBITS; goto set; } /* * req_mask is a mask covering used bits in * zbits_req. (For instance, 0b1 => 0b1, 0b101 => 0b111, * 0b11010101 => 0b11111111). */ req_mask = zbits_req; req_mask |= req_mask >> 1; req_mask |= req_mask >> 2; req_mask |= req_mask >> 4; req_mask |= req_mask >> 8; req_mask |= req_mask >> 16; req_mask |= req_mask >> 32; /* * There's no point in skipping recursion for a later * zone if it is required in a previous zone. */ if ((zbits_notreq & req_mask) == 0) { mask = 0; goto set; } /* * This bit arithmetic creates a mask of zones in which * it is okay to skip recursion. After the first zone * that has to wait for recursion, all the others have * to wait as well, so we want to create a mask in which * all the trailing zeroes in zbits_req are are 1, and * more significant bits are 0. (For instance, * 0x0700 => 0x00ff, 0x0007 => 0x0000) */ mask = ~(zbits_req | ((~zbits_req) + 1)); /* * As mentioned in (2) above, the zone corresponding to * the least significant zero could have its CLIENT-IP * and QNAME policies checked before recursion, if it * has any of those policies. So if it does, we * can set its 0 to 1. * * Locate the least significant 0 bit in the mask (for * instance, 0xff => 0x100)... */ mask2 = (mask << 1) & ~mask; /* * Also set the bit for zone 0, because if it's in * zbits_notreq then it's definitely okay to attempt to * skip recursion for zone 0... */ mask2 |= 1; /* Clear any bits *not* in zbits_notreq... */ mask2 &= zbits_notreq; /* And merge the result into the skip-recursion mask */ mask |= mask2; } set: isc_log_write(dns_lctx, DNS_LOGCATEGORY_RPZ, DNS_LOGMODULE_RBTDB, DNS_RPZ_DEBUG_QUIET, "computed RPZ qname_skip_recurse mask=0x%" PRIx64, (uint64_t)mask); rpzs->have.qname_skip_recurse = mask; } static void adj_trigger_cnt(dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type, const dns_rpz_cidr_key_t *tgt_ip, dns_rpz_prefix_t tgt_prefix, bool inc) { dns_rpz_trigger_counter_t *cnt = NULL; dns_rpz_zbits_t *have = NULL; switch (rpz_type) { case DNS_RPZ_TYPE_CLIENT_IP: REQUIRE(tgt_ip != NULL); if (KEY_IS_IPV4(tgt_prefix, tgt_ip)) { cnt = &rpz->rpzs->triggers[rpz->num].client_ipv4; have = &rpz->rpzs->have.client_ipv4; } else { cnt = &rpz->rpzs->triggers[rpz->num].client_ipv6; have = &rpz->rpzs->have.client_ipv6; } break; case DNS_RPZ_TYPE_QNAME: cnt = &rpz->rpzs->triggers[rpz->num].qname; have = &rpz->rpzs->have.qname; break; case DNS_RPZ_TYPE_IP: REQUIRE(tgt_ip != NULL); if (KEY_IS_IPV4(tgt_prefix, tgt_ip)) { cnt = &rpz->rpzs->triggers[rpz->num].ipv4; have = &rpz->rpzs->have.ipv4; } else { cnt = &rpz->rpzs->triggers[rpz->num].ipv6; have = &rpz->rpzs->have.ipv6; } break; case DNS_RPZ_TYPE_NSDNAME: cnt = &rpz->rpzs->triggers[rpz->num].nsdname; have = &rpz->rpzs->have.nsdname; break; case DNS_RPZ_TYPE_NSIP: REQUIRE(tgt_ip != NULL); if (KEY_IS_IPV4(tgt_prefix, tgt_ip)) { cnt = &rpz->rpzs->triggers[rpz->num].nsipv4; have = &rpz->rpzs->have.nsipv4; } else { cnt = &rpz->rpzs->triggers[rpz->num].nsipv6; have = &rpz->rpzs->have.nsipv6; } break; default: UNREACHABLE(); } if (inc) { if (++*cnt == 1U) { *have |= DNS_RPZ_ZBIT(rpz->num); fix_qname_skip_recurse(rpz->rpzs); } } else { REQUIRE(*cnt != 0U); if (--*cnt == 0U) { *have &= ~DNS_RPZ_ZBIT(rpz->num); fix_qname_skip_recurse(rpz->rpzs); } } } static dns_rpz_cidr_node_t * new_node(dns_rpz_zones_t *rpzs, const dns_rpz_cidr_key_t *ip, dns_rpz_prefix_t prefix, const dns_rpz_cidr_node_t *child) { dns_rpz_cidr_node_t *node = NULL; int i, words, wlen; node = isc_mem_get(rpzs->mctx, sizeof(*node)); *node = (dns_rpz_cidr_node_t){ .prefix = prefix, }; if (child != NULL) { node->sum = child->sum; } words = prefix / DNS_RPZ_CIDR_WORD_BITS; wlen = prefix % DNS_RPZ_CIDR_WORD_BITS; i = 0; while (i < words) { node->ip.w[i] = ip->w[i]; ++i; } if (wlen != 0) { node->ip.w[i] = ip->w[i] & DNS_RPZ_WORD_MASK(wlen); ++i; } while (i < DNS_RPZ_CIDR_WORDS) { node->ip.w[i++] = 0; } return (node); } static void badname(int level, const dns_name_t *name, const char *str1, const char *str2) { /* * bin/tests/system/rpz/tests.sh looks for "invalid rpz". */ if (level < DNS_RPZ_DEBUG_QUIET && isc_log_wouldlog(dns_lctx, level)) { char namebuf[DNS_NAME_FORMATSIZE]; dns_name_format(name, namebuf, sizeof(namebuf)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_RPZ, DNS_LOGMODULE_RBTDB, level, "invalid rpz IP address \"%s\"%s%s", namebuf, str1, str2); } } /* * Convert an IP address from radix tree binary (host byte order) to * to its canonical response policy domain name without the origin of the * policy zone. * * Generate a name for an IPv6 address that fits RFC 5952, except that our * reversed format requires that when the length of the consecutive 16-bit * 0 fields are equal (e.g., 1.0.0.1.0.0.db8.2001 corresponding to * 2001:db8:0:0:1:0:0:1), we shorted the last instead of the first * (e.g., 1.0.0.1.zz.db8.2001 corresponding to 2001:db8::1:0:0:1). */ static isc_result_t ip2name(const dns_rpz_cidr_key_t *tgt_ip, dns_rpz_prefix_t tgt_prefix, const dns_name_t *base_name, dns_name_t *ip_name) { #ifndef INET6_ADDRSTRLEN #define INET6_ADDRSTRLEN 46 #endif /* ifndef INET6_ADDRSTRLEN */ char str[1 + 8 + 1 + INET6_ADDRSTRLEN + 1]; isc_buffer_t buffer; isc_result_t result; int len; if (KEY_IS_IPV4(tgt_prefix, tgt_ip)) { len = snprintf(str, sizeof(str), "%u.%u.%u.%u.%u", tgt_prefix - 96U, tgt_ip->w[3] & 0xffU, (tgt_ip->w[3] >> 8) & 0xffU, (tgt_ip->w[3] >> 16) & 0xffU, (tgt_ip->w[3] >> 24) & 0xffU); if (len < 0 || (size_t)len >= sizeof(str)) { return (ISC_R_FAILURE); } } else { int w[DNS_RPZ_CIDR_WORDS * 2]; int best_first, best_len, cur_first, cur_len; len = snprintf(str, sizeof(str), "%d", tgt_prefix); if (len < 0 || (size_t)len >= sizeof(str)) { return (ISC_R_FAILURE); } for (int n = 0; n < DNS_RPZ_CIDR_WORDS; n++) { w[n * 2 + 1] = ((tgt_ip->w[DNS_RPZ_CIDR_WORDS - 1 - n] >> 16) & 0xffff); w[n * 2] = tgt_ip->w[DNS_RPZ_CIDR_WORDS - 1 - n] & 0xffff; } /* * Find the start and length of the first longest sequence * of zeros in the address. */ best_first = -1; best_len = 0; cur_first = -1; cur_len = 0; for (int n = 0; n <= 7; ++n) { if (w[n] != 0) { cur_len = 0; cur_first = -1; } else { ++cur_len; if (cur_first < 0) { cur_first = n; } else if (cur_len >= best_len) { best_first = cur_first; best_len = cur_len; } } } for (int n = 0; n <= 7; ++n) { int i; INSIST(len > 0 && (size_t)len < sizeof(str)); if (n == best_first) { i = snprintf(str + len, sizeof(str) - len, ".zz"); n += best_len - 1; } else { i = snprintf(str + len, sizeof(str) - len, ".%x", w[n]); } if (i < 0 || (size_t)i >= (size_t)(sizeof(str) - len)) { return (ISC_R_FAILURE); } len += i; } } isc_buffer_init(&buffer, str, sizeof(str)); isc_buffer_add(&buffer, len); result = dns_name_fromtext(ip_name, &buffer, base_name, 0, NULL); return (result); } /* * Determine the type of a name in a response policy zone. */ static dns_rpz_type_t type_from_name(const dns_rpz_zones_t *rpzs, dns_rpz_zone_t *rpz, const dns_name_t *name) { if (dns_name_issubdomain(name, &rpz->ip)) { return (DNS_RPZ_TYPE_IP); } if (dns_name_issubdomain(name, &rpz->client_ip)) { return (DNS_RPZ_TYPE_CLIENT_IP); } if ((rpzs->p.nsip_on & DNS_RPZ_ZBIT(rpz->num)) != 0 && dns_name_issubdomain(name, &rpz->nsip)) { return (DNS_RPZ_TYPE_NSIP); } if ((rpzs->p.nsdname_on & DNS_RPZ_ZBIT(rpz->num)) != 0 && dns_name_issubdomain(name, &rpz->nsdname)) { return (DNS_RPZ_TYPE_NSDNAME); } return (DNS_RPZ_TYPE_QNAME); } /* * Convert an IP address from canonical response policy domain name form * to radix tree binary (host byte order) for adding or deleting IP or NSIP * data. */ static isc_result_t name2ipkey(int log_level, dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type, const dns_name_t *src_name, dns_rpz_cidr_key_t *tgt_ip, dns_rpz_prefix_t *tgt_prefix, dns_rpz_addr_zbits_t *new_set) { char ip_str[DNS_NAME_FORMATSIZE]; dns_offsets_t ip_name_offsets; dns_fixedname_t ip_name2f; dns_name_t ip_name; const char *prefix_str = NULL, *cp = NULL, *end = NULL; char *cp2; int ip_labels; dns_rpz_prefix_t prefix; unsigned long prefix_num, l; isc_result_t result; int i; REQUIRE(rpz != NULL); REQUIRE(rpz->rpzs != NULL && rpz->num < rpz->rpzs->p.num_zones); make_addr_set(new_set, DNS_RPZ_ZBIT(rpz->num), rpz_type); ip_labels = dns_name_countlabels(src_name); if (rpz_type == DNS_RPZ_TYPE_QNAME) { ip_labels -= dns_name_countlabels(&rpz->origin); } else { ip_labels -= dns_name_countlabels(&rpz->nsdname); } if (ip_labels < 2) { badname(log_level, src_name, "; too short", ""); return (ISC_R_FAILURE); } dns_name_init(&ip_name, ip_name_offsets); dns_name_getlabelsequence(src_name, 0, ip_labels, &ip_name); /* * Get text for the IP address */ dns_name_format(&ip_name, ip_str, sizeof(ip_str)); end = &ip_str[strlen(ip_str) + 1]; prefix_str = ip_str; prefix_num = strtoul(prefix_str, &cp2, 10); if (*cp2 != '.') { badname(log_level, src_name, "; invalid leading prefix length", ""); return (ISC_R_FAILURE); } /* * Patch in trailing nul character to print just the length * label (for various cases below). */ *cp2 = '\0'; if (prefix_num < 1U || prefix_num > 128U) { badname(log_level, src_name, "; invalid prefix length of ", prefix_str); return (ISC_R_FAILURE); } cp = cp2 + 1; if (--ip_labels == 4 && !strchr(cp, 'z')) { /* * Convert an IPv4 address * from the form "prefix.z.y.x.w" */ if (prefix_num > 32U) { badname(log_level, src_name, "; invalid IPv4 prefix length of ", prefix_str); return (ISC_R_FAILURE); } prefix_num += 96; *tgt_prefix = (dns_rpz_prefix_t)prefix_num; tgt_ip->w[0] = 0; tgt_ip->w[1] = 0; tgt_ip->w[2] = ADDR_V4MAPPED; tgt_ip->w[3] = 0; for (i = 0; i < 32; i += 8) { l = strtoul(cp, &cp2, 10); if (l > 255U || (*cp2 != '.' && *cp2 != '\0')) { if (*cp2 == '.') { *cp2 = '\0'; } badname(log_level, src_name, "; invalid IPv4 octet ", cp); return (ISC_R_FAILURE); } tgt_ip->w[3] |= l << i; cp = cp2 + 1; } } else { /* * Convert a text IPv6 address. */ *tgt_prefix = (dns_rpz_prefix_t)prefix_num; for (i = 0; ip_labels > 0 && i < DNS_RPZ_CIDR_WORDS * 2; ip_labels--) { if (cp[0] == 'z' && cp[1] == 'z' && (cp[2] == '.' || cp[2] == '\0') && i <= 6) { do { if ((i & 1) == 0) { tgt_ip->w[3 - i / 2] = 0; } ++i; } while (ip_labels + i <= 8); cp += 3; } else { l = strtoul(cp, &cp2, 16); if (l > 0xffffu || (*cp2 != '.' && *cp2 != '\0')) { if (*cp2 == '.') { *cp2 = '\0'; } badname(log_level, src_name, "; invalid IPv6 word ", cp); return (ISC_R_FAILURE); } if ((i & 1) == 0) { tgt_ip->w[3 - i / 2] = l; } else { tgt_ip->w[3 - i / 2] |= l << 16; } i++; cp = cp2 + 1; } } } if (cp != end) { badname(log_level, src_name, "", ""); return (ISC_R_FAILURE); } /* * Check for 1s after the prefix length. */ prefix = (dns_rpz_prefix_t)prefix_num; while (prefix < DNS_RPZ_CIDR_KEY_BITS) { dns_rpz_cidr_word_t aword; i = prefix % DNS_RPZ_CIDR_WORD_BITS; aword = tgt_ip->w[prefix / DNS_RPZ_CIDR_WORD_BITS]; if ((aword & ~DNS_RPZ_WORD_MASK(i)) != 0) { badname(log_level, src_name, "; too small prefix length of ", prefix_str); return (ISC_R_FAILURE); } prefix -= i; prefix += DNS_RPZ_CIDR_WORD_BITS; } /* * Complain about bad names but be generous and accept them. */ if (log_level < DNS_RPZ_DEBUG_QUIET && isc_log_wouldlog(dns_lctx, log_level)) { /* * Convert the address back to a canonical domain name * to ensure that the original name is in canonical form. */ dns_name_t *ip_name2 = dns_fixedname_initname(&ip_name2f); result = ip2name(tgt_ip, (dns_rpz_prefix_t)prefix_num, NULL, ip_name2); if (result != ISC_R_SUCCESS || !dns_name_equal(&ip_name, ip_name2)) { char ip2_str[DNS_NAME_FORMATSIZE]; dns_name_format(ip_name2, ip2_str, sizeof(ip2_str)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_RPZ, DNS_LOGMODULE_RBTDB, log_level, "rpz IP address \"%s\"" " is not the canonical \"%s\"", ip_str, ip2_str); } } return (ISC_R_SUCCESS); } /* * Get trigger name and data bits for adding or deleting summary NSDNAME * or QNAME data. */ static void name2data(dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type, const dns_name_t *src_name, dns_name_t *trig_name, dns_rpz_nm_data_t *new_data) { dns_offsets_t tmp_name_offsets; dns_name_t tmp_name; unsigned int prefix_len, n; REQUIRE(rpz != NULL); REQUIRE(rpz->rpzs != NULL && rpz->num < rpz->rpzs->p.num_zones); /* * Handle wildcards by putting only the parent into the * summary RBT. The summary database only causes a check of the * real policy zone where wildcards will be handled. */ if (dns_name_iswildcard(src_name)) { prefix_len = 1; memset(&new_data->set, 0, sizeof(new_data->set)); make_nm_set(&new_data->wild, rpz->num, rpz_type); } else { prefix_len = 0; make_nm_set(&new_data->set, rpz->num, rpz_type); memset(&new_data->wild, 0, sizeof(new_data->wild)); } dns_name_init(&tmp_name, tmp_name_offsets); n = dns_name_countlabels(src_name); n -= prefix_len; if (rpz_type == DNS_RPZ_TYPE_QNAME) { n -= dns_name_countlabels(&rpz->origin); } else { n -= dns_name_countlabels(&rpz->nsdname); } dns_name_getlabelsequence(src_name, prefix_len, n, &tmp_name); (void)dns_name_concatenate(&tmp_name, dns_rootname, trig_name, NULL); } #ifndef HAVE_BUILTIN_CLZ /** * \brief Count Leading Zeros: Find the location of the left-most set * bit. */ static unsigned int clz(dns_rpz_cidr_word_t w) { unsigned int bit; bit = DNS_RPZ_CIDR_WORD_BITS - 1; if ((w & 0xffff0000) != 0) { w >>= 16; bit -= 16; } if ((w & 0xff00) != 0) { w >>= 8; bit -= 8; } if ((w & 0xf0) != 0) { w >>= 4; bit -= 4; } if ((w & 0xc) != 0) { w >>= 2; bit -= 2; } if ((w & 2) != 0) { --bit; } return (bit); } #endif /* ifndef HAVE_BUILTIN_CLZ */ /* * Find the first differing bit in two keys (IP addresses). */ static int diff_keys(const dns_rpz_cidr_key_t *key1, dns_rpz_prefix_t prefix1, const dns_rpz_cidr_key_t *key2, dns_rpz_prefix_t prefix2) { dns_rpz_cidr_word_t delta; dns_rpz_prefix_t maxbit, bit; int i; bit = 0; maxbit = ISC_MIN(prefix1, prefix2); /* * find the first differing words */ for (i = 0; bit < maxbit; i++, bit += DNS_RPZ_CIDR_WORD_BITS) { delta = key1->w[i] ^ key2->w[i]; if (delta != 0) { #ifdef HAVE_BUILTIN_CLZ bit += __builtin_clz(delta); #else /* ifdef HAVE_BUILTIN_CLZ */ bit += clz(delta); #endif /* ifdef HAVE_BUILTIN_CLZ */ break; } } return (ISC_MIN(bit, maxbit)); } /* * Given a hit while searching the radix trees, * clear all bits for higher numbered zones. */ static dns_rpz_zbits_t trim_zbits(dns_rpz_zbits_t zbits, dns_rpz_zbits_t found) { dns_rpz_zbits_t x; /* * Isolate the first or smallest numbered hit bit. * Make a mask of that bit and all smaller numbered bits. */ x = zbits & found; x &= (~x + 1); x = (x << 1) - 1; zbits &= x; return (zbits); } /* * Search a radix tree for an IP address for ordinary lookup * or for a CIDR block adding or deleting an entry * * Return ISC_R_SUCCESS, DNS_R_PARTIALMATCH, ISC_R_NOTFOUND, * and *found=longest match node * or with create==true, ISC_R_EXISTS or ISC_R_NOMEMORY */ static isc_result_t search(dns_rpz_zones_t *rpzs, const dns_rpz_cidr_key_t *tgt_ip, dns_rpz_prefix_t tgt_prefix, const dns_rpz_addr_zbits_t *tgt_set, bool create, dns_rpz_cidr_node_t **found) { dns_rpz_cidr_node_t *cur = NULL, *parent = NULL, *child = NULL; dns_rpz_cidr_node_t *new_parent = NULL, *sibling = NULL; dns_rpz_addr_zbits_t set; int cur_num, child_num; isc_result_t find_result; set = *tgt_set; find_result = ISC_R_NOTFOUND; *found = NULL; cur = rpzs->cidr; parent = NULL; cur_num = 0; for (;;) { dns_rpz_prefix_t dbit; if (cur == NULL) { /* * No child so we cannot go down. * Quit with whatever we already found * or add the target as a child of the current parent. */ if (!create) { return (find_result); } child = new_node(rpzs, tgt_ip, tgt_prefix, NULL); if (child == NULL) { return (ISC_R_NOMEMORY); } if (parent == NULL) { rpzs->cidr = child; } else { parent->child[cur_num] = child; } child->parent = parent; child->set.client_ip |= tgt_set->client_ip; child->set.ip |= tgt_set->ip; child->set.nsip |= tgt_set->nsip; set_sum_pair(child); *found = child; return (ISC_R_SUCCESS); } if ((cur->sum.client_ip & set.client_ip) == 0 && (cur->sum.ip & set.ip) == 0 && (cur->sum.nsip & set.nsip) == 0) { /* * This node has no relevant data * and is in none of the target trees. * Pretend it does not exist if we are not adding. * * If we are adding, continue down to eventually add * a node and mark/put this node in the correct tree. */ if (!create) { return (find_result); } } dbit = diff_keys(tgt_ip, tgt_prefix, &cur->ip, cur->prefix); /* * dbit <= tgt_prefix and dbit <= cur->prefix always. * We are finished searching if we matched all of the target. */ if (dbit == tgt_prefix) { if (tgt_prefix == cur->prefix) { /* * The node's key matches the target exactly. */ if ((cur->set.client_ip & set.client_ip) != 0 || (cur->set.ip & set.ip) != 0 || (cur->set.nsip & set.nsip) != 0) { /* * It is the answer if it has data. */ *found = cur; if (create) { find_result = ISC_R_EXISTS; } else { find_result = ISC_R_SUCCESS; } } else if (create) { /* * The node lacked relevant data, * but will have it now. */ cur->set.client_ip |= tgt_set->client_ip; cur->set.ip |= tgt_set->ip; cur->set.nsip |= tgt_set->nsip; set_sum_pair(cur); *found = cur; find_result = ISC_R_SUCCESS; } return (find_result); } /* * We know tgt_prefix < cur->prefix which means that * the target is shorter than the current node. * Add the target as the current node's parent. */ if (!create) { return (find_result); } new_parent = new_node(rpzs, tgt_ip, tgt_prefix, cur); if (new_parent == NULL) { return (ISC_R_NOMEMORY); } new_parent->parent = parent; if (parent == NULL) { rpzs->cidr = new_parent; } else { parent->child[cur_num] = new_parent; } child_num = DNS_RPZ_IP_BIT(&cur->ip, tgt_prefix); new_parent->child[child_num] = cur; cur->parent = new_parent; new_parent->set = *tgt_set; set_sum_pair(new_parent); *found = new_parent; return (ISC_R_SUCCESS); } if (dbit == cur->prefix) { if ((cur->set.client_ip & set.client_ip) != 0 || (cur->set.ip & set.ip) != 0 || (cur->set.nsip & set.nsip) != 0) { /* * We have a partial match between of all of the * current node but only part of the target. * Continue searching for other hits in the * same or lower numbered trees. */ find_result = DNS_R_PARTIALMATCH; *found = cur; set.client_ip = trim_zbits(set.client_ip, cur->set.client_ip); set.ip = trim_zbits(set.ip, cur->set.ip); set.nsip = trim_zbits(set.nsip, cur->set.nsip); } parent = cur; cur_num = DNS_RPZ_IP_BIT(tgt_ip, dbit); cur = cur->child[cur_num]; continue; } /* * dbit < tgt_prefix and dbit < cur->prefix, * so we failed to match both the target and the current node. * Insert a fork of a parent above the current node and * add the target as a sibling of the current node */ if (!create) { return (find_result); } sibling = new_node(rpzs, tgt_ip, tgt_prefix, NULL); if (sibling == NULL) { return (ISC_R_NOMEMORY); } new_parent = new_node(rpzs, tgt_ip, dbit, cur); if (new_parent == NULL) { isc_mem_put(rpzs->mctx, sibling, sizeof(*sibling)); return (ISC_R_NOMEMORY); } new_parent->parent = parent; if (parent == NULL) { rpzs->cidr = new_parent; } else { parent->child[cur_num] = new_parent; } child_num = DNS_RPZ_IP_BIT(tgt_ip, dbit); new_parent->child[child_num] = sibling; new_parent->child[1 - child_num] = cur; cur->parent = new_parent; sibling->parent = new_parent; sibling->set = *tgt_set; set_sum_pair(sibling); *found = sibling; return (ISC_R_SUCCESS); } } /* * Add an IP address to the radix tree. */ static isc_result_t add_cidr(dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type, const dns_name_t *src_name) { dns_rpz_cidr_key_t tgt_ip; dns_rpz_prefix_t tgt_prefix; dns_rpz_addr_zbits_t set; dns_rpz_cidr_node_t *found = NULL; isc_result_t result; result = name2ipkey(DNS_RPZ_ERROR_LEVEL, rpz, rpz_type, src_name, &tgt_ip, &tgt_prefix, &set); /* * Log complaints about bad owner names but let the zone load. */ if (result != ISC_R_SUCCESS) { return (ISC_R_SUCCESS); } result = search(rpz->rpzs, &tgt_ip, tgt_prefix, &set, true, &found); if (result != ISC_R_SUCCESS) { char namebuf[DNS_NAME_FORMATSIZE]; /* * Do not worry if the radix tree already exists, * because diff_apply() likes to add nodes before deleting. */ if (result == ISC_R_EXISTS) { return (ISC_R_SUCCESS); } /* * bin/tests/system/rpz/tests.sh looks for "rpz.*failed". */ dns_name_format(src_name, namebuf, sizeof(namebuf)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_RPZ, DNS_LOGMODULE_RBTDB, DNS_RPZ_ERROR_LEVEL, "rpz add_cidr(%s) failed: %s", namebuf, isc_result_totext(result)); return (result); } adj_trigger_cnt(rpz, rpz_type, &tgt_ip, tgt_prefix, true); return (result); } static isc_result_t add_nm(dns_rpz_zones_t *rpzs, dns_name_t *trig_name, const dns_rpz_nm_data_t *new_data) { dns_rbtnode_t *nmnode = NULL; dns_rpz_nm_data_t *nm_data = NULL; isc_result_t result; nmnode = NULL; result = dns_rbt_addnode(rpzs->rbt, trig_name, &nmnode); switch (result) { case ISC_R_SUCCESS: case ISC_R_EXISTS: nm_data = nmnode->data; if (nm_data == NULL) { nm_data = isc_mem_get(rpzs->mctx, sizeof(*nm_data)); *nm_data = *new_data; nmnode->data = nm_data; return (ISC_R_SUCCESS); } break; default: return (result); } /* * Do not count bits that are already present */ if ((nm_data->set.qname & new_data->set.qname) != 0 || (nm_data->set.ns & new_data->set.ns) != 0 || (nm_data->wild.qname & new_data->wild.qname) != 0 || (nm_data->wild.ns & new_data->wild.ns) != 0) { return (ISC_R_EXISTS); } nm_data->set.qname |= new_data->set.qname; nm_data->set.ns |= new_data->set.ns; nm_data->wild.qname |= new_data->wild.qname; nm_data->wild.ns |= new_data->wild.ns; return (ISC_R_SUCCESS); } static isc_result_t add_name(dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type, const dns_name_t *src_name) { dns_rpz_nm_data_t new_data; dns_fixedname_t trig_namef; dns_name_t *trig_name = NULL; isc_result_t result; /* * We need a summary database of names even with 1 policy zone, * because wildcard triggers are handled differently. */ trig_name = dns_fixedname_initname(&trig_namef); name2data(rpz, rpz_type, src_name, trig_name, &new_data); result = add_nm(rpz->rpzs, trig_name, &new_data); /* * Do not worry if the node already exists, * because diff_apply() likes to add nodes before deleting. */ if (result == ISC_R_EXISTS) { return (ISC_R_SUCCESS); } if (result == ISC_R_SUCCESS) { adj_trigger_cnt(rpz, rpz_type, NULL, 0, true); } return (result); } /* * Callback to free the data for a node in the summary RBT database. */ static void rpz_node_deleter(void *nm_data, void *mctx) { isc_mem_put(mctx, nm_data, sizeof(dns_rpz_nm_data_t)); } /* * Get ready for a new set of policy zones for a view. */ isc_result_t dns_rpz_new_zones(isc_mem_t *mctx, isc_taskmgr_t *taskmgr, isc_timermgr_t *timermgr, char *rps_cstr, size_t rps_cstr_size, dns_rpz_zones_t **rpzsp) { dns_rpz_zones_t *rpzs = NULL; isc_result_t result = ISC_R_SUCCESS; REQUIRE(rpzsp != NULL && *rpzsp == NULL); rpzs = isc_mem_get(mctx, sizeof(*rpzs)); *rpzs = (dns_rpz_zones_t){ .rps_cstr = rps_cstr, .rps_cstr_size = rps_cstr_size, .taskmgr = taskmgr, .timermgr = timermgr, .magic = DNS_RPZ_ZONES_MAGIC, }; isc_rwlock_init(&rpzs->search_lock, 0, 0); isc_mutex_init(&rpzs->maint_lock); isc_refcount_init(&rpzs->references, 1); #ifdef USE_DNSRPS if (rps_cstr != NULL) { result = dns_dnsrps_view_init(rpzs, rps_cstr); if (result != ISC_R_SUCCESS) { goto cleanup_rbt; } } #else /* ifdef USE_DNSRPS */ INSIST(!rpzs->p.dnsrps_enabled); #endif /* ifdef USE_DNSRPS */ if (!rpzs->p.dnsrps_enabled) { result = dns_rbt_create(mctx, rpz_node_deleter, mctx, &rpzs->rbt); } if (result != ISC_R_SUCCESS) { goto cleanup_rbt; } result = isc_taskmgr_excltask(taskmgr, &rpzs->updater); if (result != ISC_R_SUCCESS) { goto cleanup_task; } isc_mem_attach(mctx, &rpzs->mctx); *rpzsp = rpzs; return (ISC_R_SUCCESS); cleanup_task: dns_rbt_destroy(&rpzs->rbt); cleanup_rbt: isc_refcount_decrementz(&rpzs->references); isc_refcount_destroy(&rpzs->references); isc_mutex_destroy(&rpzs->maint_lock); isc_rwlock_destroy(&rpzs->search_lock); isc_mem_put(mctx, rpzs, sizeof(*rpzs)); return (result); } isc_result_t dns_rpz_new_zone(dns_rpz_zones_t *rpzs, dns_rpz_zone_t **rpzp) { isc_result_t result; dns_rpz_zone_t *rpz = NULL; REQUIRE(DNS_RPZ_ZONES_VALID(rpzs)); REQUIRE(rpzp != NULL && *rpzp == NULL); if (rpzs->p.num_zones >= DNS_RPZ_MAX_ZONES) { return (ISC_R_NOSPACE); } result = dns__rpz_shuttingdown(rpzs); if (result != ISC_R_SUCCESS) { return (result); } rpz = isc_mem_get(rpzs->mctx, sizeof(*rpz)); *rpz = (dns_rpz_zone_t){ .addsoa = true, .magic = DNS_RPZ_ZONE_MAGIC, .rpzs = rpzs, }; result = isc_timer_create(rpzs->timermgr, isc_timertype_inactive, NULL, NULL, rpzs->updater, dns__rpz_timer_cb, rpz, &rpz->updatetimer); if (result != ISC_R_SUCCESS) { goto cleanup_timer; } /* * This will never be used, but costs us nothing and * simplifies dns__rpz_timer_cb(). */ isc_ht_init(&rpz->nodes, rpzs->mctx, 1, ISC_HT_CASE_SENSITIVE); dns_name_init(&rpz->origin, NULL); dns_name_init(&rpz->client_ip, NULL); dns_name_init(&rpz->ip, NULL); dns_name_init(&rpz->nsdname, NULL); dns_name_init(&rpz->nsip, NULL); dns_name_init(&rpz->passthru, NULL); dns_name_init(&rpz->drop, NULL); dns_name_init(&rpz->tcp_only, NULL); dns_name_init(&rpz->cname, NULL); isc_time_settoepoch(&rpz->lastupdated); ISC_EVENT_INIT(&rpz->updateevent, sizeof(rpz->updateevent), 0, NULL, 0, NULL, NULL, NULL, NULL, NULL); rpz->num = rpzs->p.num_zones++; rpzs->zones[rpz->num] = rpz; *rpzp = rpz; return (ISC_R_SUCCESS); cleanup_timer: isc_mem_put(rpzs->mctx, rpz, sizeof(*rpz)); return (result); } isc_result_t dns_rpz_dbupdate_callback(dns_db_t *db, void *fn_arg) { dns_rpz_zone_t *rpz = (dns_rpz_zone_t *)fn_arg; isc_time_t now; isc_result_t result = ISC_R_SUCCESS; char dname[DNS_NAME_FORMATSIZE]; REQUIRE(DNS_DB_VALID(db)); REQUIRE(DNS_RPZ_ZONE_VALID(rpz)); LOCK(&rpz->rpzs->maint_lock); if (rpz->rpzs->shuttingdown) { result = ISC_R_SHUTTINGDOWN; goto unlock; } /* New zone came as AXFR */ if (rpz->db != NULL && rpz->db != db) { /* We need to clean up the old DB */ if (rpz->dbversion != NULL) { dns_db_closeversion(rpz->db, &rpz->dbversion, false); } dns_db_updatenotify_unregister(rpz->db, dns_rpz_dbupdate_callback, rpz); dns_db_detach(&rpz->db); } if (rpz->db == NULL) { RUNTIME_CHECK(rpz->dbversion == NULL); dns_db_attach(db, &rpz->db); } dns_name_format(&rpz->origin, dname, DNS_NAME_FORMATSIZE); if (!rpz->updatepending && !rpz->updaterunning) { uint64_t tdiff; rpz->updatepending = true; isc_time_now(&now); tdiff = isc_time_microdiff(&now, &rpz->lastupdated) / 1000000; if (tdiff < rpz->min_update_interval) { uint64_t defer = rpz->min_update_interval - tdiff; isc_interval_t interval; isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_INFO, "rpz: %s: new zone version came " "too soon, deferring update for " "%" PRIu64 " seconds", dname, defer); isc_interval_set(&interval, (unsigned int)defer, 0); dns_db_currentversion(rpz->db, &rpz->dbversion); (void)isc_timer_reset(rpz->updatetimer, isc_timertype_once, NULL, &interval, true); } else { isc_event_t *event = NULL; dns_db_currentversion(rpz->db, &rpz->dbversion); INSIST(!ISC_LINK_LINKED(&rpz->updateevent, ev_link)); ISC_EVENT_INIT(&rpz->updateevent, sizeof(rpz->updateevent), 0, NULL, DNS_EVENT_RPZUPDATED, dns__rpz_timer_cb, rpz, rpz, NULL, NULL); event = &rpz->updateevent; isc_task_send(rpz->rpzs->updater, &event); } } else { rpz->updatepending = true; isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_DEBUG(3), "rpz: %s: update already queued or running", dname); if (rpz->dbversion != NULL) { dns_db_closeversion(rpz->db, &rpz->dbversion, false); } dns_db_currentversion(rpz->db, &rpz->dbversion); } unlock: UNLOCK(&rpz->rpzs->maint_lock); return (result); } static void update_rpz_done_cb(void *data, isc_result_t result) { dns_rpz_zone_t *rpz = (dns_rpz_zone_t *)data; char dname[DNS_NAME_FORMATSIZE]; REQUIRE(DNS_RPZ_ZONE_VALID(rpz)); if (result == ISC_R_SUCCESS && rpz->updateresult != ISC_R_SUCCESS) { result = rpz->updateresult; } LOCK(&rpz->rpzs->maint_lock); rpz->updaterunning = false; dns_name_format(&rpz->origin, dname, DNS_NAME_FORMATSIZE); /* If there's no update pending, or if shutting down, finish. */ if (!rpz->updatepending || rpz->rpzs->shuttingdown) { goto done; } /* If there's an update pending, schedule it */ if (rpz->min_update_interval > 0) { uint64_t defer = rpz->min_update_interval; isc_interval_t interval; isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_INFO, "rpz: %s: new zone version came " "too soon, deferring update for " "%" PRIu64 " seconds", dname, defer); isc_interval_set(&interval, (unsigned int)defer, 0); (void)isc_timer_reset(rpz->updatetimer, isc_timertype_once, NULL, &interval, true); } else { isc_event_t *event = NULL; INSIST(!ISC_LINK_LINKED(&rpz->updateevent, ev_link)); ISC_EVENT_INIT(&rpz->updateevent, sizeof(rpz->updateevent), 0, NULL, DNS_EVENT_RPZUPDATED, dns__rpz_timer_cb, rpz, rpz, NULL, NULL); event = &rpz->updateevent; isc_task_send(rpz->rpzs->updater, &event); } done: dns_db_closeversion(rpz->updb, &rpz->updbversion, false); dns_db_detach(&rpz->updb); UNLOCK(&rpz->rpzs->maint_lock); isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_INFO, "rpz: %s: reload done: %s", dname, isc_result_totext(result)); dns_rpz_unref_rpzs(rpz->rpzs); } static isc_result_t update_nodes(dns_rpz_zone_t *rpz, isc_ht_t *newnodes) { isc_result_t result; dns_dbiterator_t *updbit = NULL; dns_name_t *name = NULL; dns_fixedname_t fixname; char domain[DNS_NAME_FORMATSIZE]; dns_name_format(&rpz->origin, domain, DNS_NAME_FORMATSIZE); name = dns_fixedname_initname(&fixname); result = dns_db_createiterator(rpz->updb, DNS_DB_NONSEC3, &updbit); if (result != ISC_R_SUCCESS) { isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_ERROR, "rpz: %s: failed to create DB iterator - %s", domain, isc_result_totext(result)); return (result); } result = dns_dbiterator_first(updbit); if (result != ISC_R_SUCCESS && result != ISC_R_NOMORE) { isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_ERROR, "rpz: %s: failed to get db iterator - %s", domain, isc_result_totext(result)); goto cleanup; } while (result == ISC_R_SUCCESS) { char namebuf[DNS_NAME_FORMATSIZE]; dns_rdatasetiter_t *rdsiter = NULL; dns_dbnode_t *node = NULL; result = dns__rpz_shuttingdown(rpz->rpzs); if (result != ISC_R_SUCCESS) { goto cleanup; } result = dns_dbiterator_current(updbit, &node, name); if (result != ISC_R_SUCCESS) { isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_ERROR, "rpz: %s: failed to get dbiterator - %s", domain, isc_result_totext(result)); goto cleanup; } result = dns_dbiterator_pause(updbit); RUNTIME_CHECK(result == ISC_R_SUCCESS); result = dns_db_allrdatasets(rpz->updb, node, rpz->updbversion, 0, 0, &rdsiter); if (result != ISC_R_SUCCESS) { isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_ERROR, "rpz: %s: failed to fetch " "rrdatasets - %s", domain, isc_result_totext(result)); dns_db_detachnode(rpz->updb, &node); goto cleanup; } result = dns_rdatasetiter_first(rdsiter); dns_rdatasetiter_destroy(&rdsiter); dns_db_detachnode(rpz->updb, &node); if (result != ISC_R_SUCCESS) { /* skip empty non-terminal */ if (result != ISC_R_NOMORE) { isc_log_write( dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_ERROR, "rpz: %s: error %s while creating " "rdatasetiter", domain, isc_result_totext(result)); } goto next; } dns_name_downcase(name, name, NULL); /* Add entry to the new nodes table */ result = isc_ht_add(newnodes, name->ndata, name->length, rpz); if (result != ISC_R_SUCCESS) { dns_name_format(name, namebuf, sizeof(namebuf)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_ERROR, "rpz: %s, adding node %s to HT error %s", domain, namebuf, isc_result_totext(result)); goto next; } /* Does the entry exist in the old nodes table? */ result = isc_ht_find(rpz->nodes, name->ndata, name->length, NULL); if (result == ISC_R_SUCCESS) { /* found */ isc_ht_delete(rpz->nodes, name->ndata, name->length); goto next; } /* * Only the single rpz updates are serialized, so we need to * lock here because we can be processing more updates to * different rpz zones at the same time */ LOCK(&rpz->rpzs->maint_lock); result = rpz_add(rpz, name); UNLOCK(&rpz->rpzs->maint_lock); if (result != ISC_R_SUCCESS) { dns_name_format(name, namebuf, sizeof(namebuf)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_ERROR, "rpz: %s: adding node %s " "to RPZ error %s", domain, namebuf, isc_result_totext(result)); } else if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(3))) { dns_name_format(name, namebuf, sizeof(namebuf)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_DEBUG(3), "rpz: %s: adding node %s", domain, namebuf); } next: result = dns_dbiterator_next(updbit); } INSIST(result != ISC_R_SUCCESS); if (result == ISC_R_NOMORE) { result = ISC_R_SUCCESS; } cleanup: dns_dbiterator_destroy(&updbit); return (result); } static isc_result_t cleanup_nodes(dns_rpz_zone_t *rpz) { isc_result_t result; isc_ht_iter_t *iter = NULL; dns_name_t *name = NULL; dns_fixedname_t fixname; name = dns_fixedname_initname(&fixname); isc_ht_iter_create(rpz->nodes, &iter); for (result = isc_ht_iter_first(iter); result == ISC_R_SUCCESS; result = isc_ht_iter_delcurrent_next(iter)) { isc_region_t region; unsigned char *key = NULL; size_t keysize; result = dns__rpz_shuttingdown(rpz->rpzs); if (result != ISC_R_SUCCESS) { break; } isc_ht_iter_currentkey(iter, &key, &keysize); region.base = key; region.length = (unsigned int)keysize; dns_name_fromregion(name, ®ion); LOCK(&rpz->rpzs->maint_lock); rpz_del(rpz, name); UNLOCK(&rpz->rpzs->maint_lock); } INSIST(result != ISC_R_SUCCESS); if (result == ISC_R_NOMORE) { result = ISC_R_SUCCESS; } isc_ht_iter_destroy(&iter); return (result); } static isc_result_t dns__rpz_shuttingdown(dns_rpz_zones_t *rpzs) { bool shuttingdown = false; LOCK(&rpzs->maint_lock); shuttingdown = rpzs->shuttingdown; UNLOCK(&rpzs->maint_lock); if (shuttingdown) { return (ISC_R_SHUTTINGDOWN); } return (ISC_R_SUCCESS); } static void update_rpz_cb(void *data) { dns_rpz_zone_t *rpz = (dns_rpz_zone_t *)data; isc_result_t result = ISC_R_SUCCESS; isc_ht_t *newnodes = NULL; REQUIRE(rpz->nodes != NULL); result = dns__rpz_shuttingdown(rpz->rpzs); if (result != ISC_R_SUCCESS) { goto shuttingdown; } isc_ht_init(&newnodes, rpz->rpzs->mctx, 1, ISC_HT_CASE_SENSITIVE); result = update_nodes(rpz, newnodes); if (result != ISC_R_SUCCESS) { goto cleanup; } result = cleanup_nodes(rpz); if (result != ISC_R_SUCCESS) { goto cleanup; } /* Finalize the update */ ISC_SWAP(rpz->nodes, newnodes); cleanup: isc_ht_destroy(&newnodes); shuttingdown: rpz->updateresult = result; } static void dns__rpz_timer_cb(isc_task_t *task, isc_event_t *event) { char domain[DNS_NAME_FORMATSIZE]; isc_result_t result; dns_rpz_zone_t *rpz = NULL; UNUSED(task); REQUIRE(event != NULL); REQUIRE(event->ev_arg != NULL); rpz = (dns_rpz_zone_t *)event->ev_arg; isc_event_free(&event); REQUIRE(isc_nm_tid() >= 0); REQUIRE(DNS_RPZ_ZONE_VALID(rpz)); LOCK(&rpz->rpzs->maint_lock); if (rpz->rpzs->shuttingdown) { goto unlock; } rpz->updatepending = false; rpz->updaterunning = true; rpz->updateresult = ISC_R_UNSET; INSIST(rpz->updb == NULL); INSIST(rpz->updbversion == NULL); INSIST(rpz->dbversion != NULL); INSIST(DNS_DB_VALID(rpz->db)); dns_db_attach(rpz->db, &rpz->updb); rpz->updbversion = rpz->dbversion; rpz->dbversion = NULL; dns_name_format(&rpz->origin, domain, DNS_NAME_FORMATSIZE); isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_MASTER, ISC_LOG_INFO, "rpz: %s: reload start", domain); dns_rpz_ref_rpzs(rpz->rpzs); isc_nm_work_offload(isc_task_getnetmgr(rpz->rpzs->updater), update_rpz_cb, update_rpz_done_cb, rpz); result = isc_time_now(&rpz->lastupdated); RUNTIME_CHECK(result == ISC_R_SUCCESS); unlock: UNLOCK(&rpz->rpzs->maint_lock); } /* * Free the radix tree of a response policy database. */ static void cidr_free(dns_rpz_zones_t *rpzs) { dns_rpz_cidr_node_t *cur = NULL, *child = NULL, *parent = NULL; cur = rpzs->cidr; while (cur != NULL) { /* Depth first. */ child = cur->child[0]; if (child != NULL) { cur = child; continue; } child = cur->child[1]; if (child != NULL) { cur = child; continue; } /* Delete this leaf and go up. */ parent = cur->parent; if (parent == NULL) { rpzs->cidr = NULL; } else { parent->child[parent->child[1] == cur] = NULL; } isc_mem_put(rpzs->mctx, cur, sizeof(*cur)); cur = parent; } } static void dns__rpz_shutdown(dns_rpz_zone_t *rpz) { /* maint_lock must be locked */ if (rpz->updatetimer != NULL) { isc_result_t result; /* Don't wait for timer to trigger for shutdown */ result = isc_timer_reset(rpz->updatetimer, isc_timertype_inactive, NULL, NULL, true); RUNTIME_CHECK(result == ISC_R_SUCCESS); } } static void dns_rpz_zone_destroy(dns_rpz_zone_t **rpzp) { dns_rpz_zone_t *rpz = NULL; dns_rpz_zones_t *rpzs; rpz = *rpzp; *rpzp = NULL; rpzs = rpz->rpzs; rpz->rpzs = NULL; if (dns_name_dynamic(&rpz->origin)) { dns_name_free(&rpz->origin, rpzs->mctx); } if (dns_name_dynamic(&rpz->client_ip)) { dns_name_free(&rpz->client_ip, rpzs->mctx); } if (dns_name_dynamic(&rpz->ip)) { dns_name_free(&rpz->ip, rpzs->mctx); } if (dns_name_dynamic(&rpz->nsdname)) { dns_name_free(&rpz->nsdname, rpzs->mctx); } if (dns_name_dynamic(&rpz->nsip)) { dns_name_free(&rpz->nsip, rpzs->mctx); } if (dns_name_dynamic(&rpz->passthru)) { dns_name_free(&rpz->passthru, rpzs->mctx); } if (dns_name_dynamic(&rpz->drop)) { dns_name_free(&rpz->drop, rpzs->mctx); } if (dns_name_dynamic(&rpz->tcp_only)) { dns_name_free(&rpz->tcp_only, rpzs->mctx); } if (dns_name_dynamic(&rpz->cname)) { dns_name_free(&rpz->cname, rpzs->mctx); } if (rpz->db != NULL) { if (rpz->dbversion != NULL) { dns_db_closeversion(rpz->db, &rpz->dbversion, false); } dns_db_updatenotify_unregister(rpz->db, dns_rpz_dbupdate_callback, rpz); dns_db_detach(&rpz->db); } INSIST(!rpz->updaterunning); isc_timer_reset(rpz->updatetimer, isc_timertype_inactive, NULL, NULL, true); isc_timer_destroy(&rpz->updatetimer); isc_ht_destroy(&rpz->nodes); isc_mem_put(rpzs->mctx, rpz, sizeof(*rpz)); } static void dns__rpz_zones_destroy(dns_rpz_zones_t *rpzs) { REQUIRE(rpzs->shuttingdown); isc_refcount_destroy(&rpzs->references); for (dns_rpz_num_t rpz_num = 0; rpz_num < DNS_RPZ_MAX_ZONES; ++rpz_num) { if (rpzs->zones[rpz_num] == NULL) { continue; } dns_rpz_zone_destroy(&rpzs->zones[rpz_num]); } if (rpzs->rps_cstr_size != 0) { #ifdef USE_DNSRPS librpz->client_detach(&rpzs->rps_client); #endif /* ifdef USE_DNSRPS */ isc_mem_put(rpzs->mctx, rpzs->rps_cstr, rpzs->rps_cstr_size); } cidr_free(rpzs); if (rpzs->rbt != NULL) { dns_rbt_destroy(&rpzs->rbt); } isc_task_detach(&rpzs->updater); isc_mutex_destroy(&rpzs->maint_lock); isc_rwlock_destroy(&rpzs->search_lock); isc_mem_putanddetach(&rpzs->mctx, rpzs, sizeof(*rpzs)); } void dns_rpz_zones_shutdown(dns_rpz_zones_t *rpzs) { REQUIRE(DNS_RPZ_ZONES_VALID(rpzs)); /* * Forget the last of the view's rpz machinery when shutting down. */ LOCK(&rpzs->maint_lock); if (rpzs->shuttingdown) { UNLOCK(&rpzs->maint_lock); return; } rpzs->shuttingdown = true; for (dns_rpz_num_t rpz_num = 0; rpz_num < DNS_RPZ_MAX_ZONES; ++rpz_num) { if (rpzs->zones[rpz_num] == NULL) { continue; } dns__rpz_shutdown(rpzs->zones[rpz_num]); } UNLOCK(&rpzs->maint_lock); } #ifdef DNS_RPZ_TRACE ISC_REFCOUNT_TRACE_IMPL(dns_rpz_zones, dns__rpz_zones_destroy); #else ISC_REFCOUNT_IMPL(dns_rpz_zones, dns__rpz_zones_destroy); #endif /* * Add an IP address to the radix tree or a name to the summary database. */ static isc_result_t rpz_add(dns_rpz_zone_t *rpz, const dns_name_t *src_name) { dns_rpz_type_t rpz_type; isc_result_t result = ISC_R_FAILURE; dns_rpz_zones_t *rpzs = NULL; dns_rpz_num_t rpz_num; REQUIRE(rpz != NULL); rpzs = rpz->rpzs; rpz_num = rpz->num; REQUIRE(rpzs != NULL && rpz_num < rpzs->p.num_zones); RWLOCK(&rpzs->search_lock, isc_rwlocktype_write); rpz_type = type_from_name(rpzs, rpz, src_name); switch (rpz_type) { case DNS_RPZ_TYPE_QNAME: case DNS_RPZ_TYPE_NSDNAME: result = add_name(rpz, rpz_type, src_name); break; case DNS_RPZ_TYPE_CLIENT_IP: case DNS_RPZ_TYPE_IP: case DNS_RPZ_TYPE_NSIP: result = add_cidr(rpz, rpz_type, src_name); break; case DNS_RPZ_TYPE_BAD: break; } RWUNLOCK(&rpzs->search_lock, isc_rwlocktype_write); return (result); } /* * Remove an IP address from the radix tree. */ static void del_cidr(dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type, const dns_name_t *src_name) { isc_result_t result; dns_rpz_cidr_key_t tgt_ip; dns_rpz_prefix_t tgt_prefix; dns_rpz_addr_zbits_t tgt_set; dns_rpz_cidr_node_t *tgt = NULL, *parent = NULL, *child = NULL; /* * Do not worry about invalid rpz IP address names. If we * are here, then something relevant was added and so was * valid. Invalid names here are usually internal RBTDB nodes. */ result = name2ipkey(DNS_RPZ_DEBUG_QUIET, rpz, rpz_type, src_name, &tgt_ip, &tgt_prefix, &tgt_set); if (result != ISC_R_SUCCESS) { return; } result = search(rpz->rpzs, &tgt_ip, tgt_prefix, &tgt_set, false, &tgt); if (result != ISC_R_SUCCESS) { INSIST(result == ISC_R_NOTFOUND || result == DNS_R_PARTIALMATCH); /* * Do not worry about missing summary RBT nodes that probably * correspond to RBTDB nodes that were implicit RBT nodes * that were later added for (often empty) wildcards * and then to the RBTDB deferred cleanup list. */ return; } /* * Mark the node and its parents to reflect the deleted IP address. * Do not count bits that are already clear for internal RBTDB nodes. */ tgt_set.client_ip &= tgt->set.client_ip; tgt_set.ip &= tgt->set.ip; tgt_set.nsip &= tgt->set.nsip; tgt->set.client_ip &= ~tgt_set.client_ip; tgt->set.ip &= ~tgt_set.ip; tgt->set.nsip &= ~tgt_set.nsip; set_sum_pair(tgt); adj_trigger_cnt(rpz, rpz_type, &tgt_ip, tgt_prefix, false); /* * We might need to delete 2 nodes. */ do { /* * The node is now useless if it has no data of its own * and 0 or 1 children. We are finished if it is not * useless. */ if ((child = tgt->child[0]) != NULL) { if (tgt->child[1] != NULL) { break; } } else { child = tgt->child[1]; } if (tgt->set.client_ip != 0 || tgt->set.ip != 0 || tgt->set.nsip != 0) { break; } /* * Replace the pointer to this node in the parent with * the remaining child or NULL. */ parent = tgt->parent; if (parent == NULL) { rpz->rpzs->cidr = child; } else { parent->child[parent->child[1] == tgt] = child; } /* * If the child exists fix up its parent pointer. */ if (child != NULL) { child->parent = parent; } isc_mem_put(rpz->rpzs->mctx, tgt, sizeof(*tgt)); tgt = parent; } while (tgt != NULL); } static void del_name(dns_rpz_zone_t *rpz, dns_rpz_type_t rpz_type, const dns_name_t *src_name) { char namebuf[DNS_NAME_FORMATSIZE]; dns_fixedname_t trig_namef; dns_name_t *trig_name = NULL; dns_rbtnode_t *nmnode = NULL; dns_rpz_nm_data_t *nm_data = NULL; dns_rpz_nm_data_t del_data; isc_result_t result; bool exists; /* * We need a summary database of names even with 1 policy zone, * because wildcard triggers are handled differently. */ trig_name = dns_fixedname_initname(&trig_namef); name2data(rpz, rpz_type, src_name, trig_name, &del_data); nmnode = NULL; result = dns_rbt_findnode(rpz->rpzs->rbt, trig_name, NULL, &nmnode, NULL, 0, NULL, NULL); if (result != ISC_R_SUCCESS) { /* * Do not worry about missing summary RBT nodes that probably * correspond to RBTDB nodes that were implicit RBT nodes * that were later added for (often empty) wildcards * and then to the RBTDB deferred cleanup list. */ if (result == ISC_R_NOTFOUND || result == DNS_R_PARTIALMATCH) { return; } dns_name_format(src_name, namebuf, sizeof(namebuf)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_RPZ, DNS_LOGMODULE_RBTDB, DNS_RPZ_ERROR_LEVEL, "rpz del_name(%s) node search failed: %s", namebuf, isc_result_totext(result)); return; } nm_data = nmnode->data; INSIST(nm_data != NULL); /* * Do not count bits that next existed for RBT nodes that would we * would not have found in a summary for a single RBTDB tree. */ del_data.set.qname &= nm_data->set.qname; del_data.set.ns &= nm_data->set.ns; del_data.wild.qname &= nm_data->wild.qname; del_data.wild.ns &= nm_data->wild.ns; exists = (del_data.set.qname != 0 || del_data.set.ns != 0 || del_data.wild.qname != 0 || del_data.wild.ns != 0); nm_data->set.qname &= ~del_data.set.qname; nm_data->set.ns &= ~del_data.set.ns; nm_data->wild.qname &= ~del_data.wild.qname; nm_data->wild.ns &= ~del_data.wild.ns; if (nm_data->set.qname == 0 && nm_data->set.ns == 0 && nm_data->wild.qname == 0 && nm_data->wild.ns == 0) { result = dns_rbt_deletenode(rpz->rpzs->rbt, nmnode, false); if (result != ISC_R_SUCCESS) { /* * bin/tests/system/rpz/tests.sh looks for * "rpz.*failed". */ dns_name_format(src_name, namebuf, sizeof(namebuf)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_RPZ, DNS_LOGMODULE_RBTDB, DNS_RPZ_ERROR_LEVEL, "rpz del_name(%s) node delete " "failed: %s", namebuf, isc_result_totext(result)); } } if (exists) { adj_trigger_cnt(rpz, rpz_type, NULL, 0, false); } } /* * Remove an IP address from the radix tree or a name from the summary database. */ static void rpz_del(dns_rpz_zone_t *rpz, const dns_name_t *src_name) { dns_rpz_type_t rpz_type; dns_rpz_zones_t *rpzs = NULL; dns_rpz_num_t rpz_num; REQUIRE(rpz != NULL); rpzs = rpz->rpzs; rpz_num = rpz->num; REQUIRE(rpzs != NULL && rpz_num < rpzs->p.num_zones); RWLOCK(&rpzs->search_lock, isc_rwlocktype_write); rpz_type = type_from_name(rpzs, rpz, src_name); switch (rpz_type) { case DNS_RPZ_TYPE_QNAME: case DNS_RPZ_TYPE_NSDNAME: del_name(rpz, rpz_type, src_name); break; case DNS_RPZ_TYPE_CLIENT_IP: case DNS_RPZ_TYPE_IP: case DNS_RPZ_TYPE_NSIP: del_cidr(rpz, rpz_type, src_name); break; case DNS_RPZ_TYPE_BAD: break; } RWUNLOCK(&rpzs->search_lock, isc_rwlocktype_write); } /* * Search the summary radix tree to get a relative owner name in a * policy zone relevant to a triggering IP address. * rpz_type and zbits limit the search for IP address netaddr * return the policy zone's number or DNS_RPZ_INVALID_NUM * ip_name is the relative owner name found and * *prefixp is its prefix length. */ dns_rpz_num_t dns_rpz_find_ip(dns_rpz_zones_t *rpzs, dns_rpz_type_t rpz_type, dns_rpz_zbits_t zbits, const isc_netaddr_t *netaddr, dns_name_t *ip_name, dns_rpz_prefix_t *prefixp) { dns_rpz_cidr_key_t tgt_ip; dns_rpz_addr_zbits_t tgt_set; dns_rpz_cidr_node_t *found = NULL; isc_result_t result; dns_rpz_num_t rpz_num = 0; dns_rpz_have_t have; int i; RWLOCK(&rpzs->search_lock, isc_rwlocktype_read); have = rpzs->have; RWUNLOCK(&rpzs->search_lock, isc_rwlocktype_read); /* * Convert IP address to CIDR tree key. */ if (netaddr->family == AF_INET) { tgt_ip.w[0] = 0; tgt_ip.w[1] = 0; tgt_ip.w[2] = ADDR_V4MAPPED; tgt_ip.w[3] = ntohl(netaddr->type.in.s_addr); switch (rpz_type) { case DNS_RPZ_TYPE_CLIENT_IP: zbits &= have.client_ipv4; break; case DNS_RPZ_TYPE_IP: zbits &= have.ipv4; break; case DNS_RPZ_TYPE_NSIP: zbits &= have.nsipv4; break; default: UNREACHABLE(); break; } } else if (netaddr->family == AF_INET6) { dns_rpz_cidr_key_t src_ip6; /* * Given the int aligned struct in_addr member of netaddr->type * one could cast netaddr->type.in6 to dns_rpz_cidr_key_t *, * but some people object. */ memmove(src_ip6.w, &netaddr->type.in6, sizeof(src_ip6.w)); for (i = 0; i < 4; i++) { tgt_ip.w[i] = ntohl(src_ip6.w[i]); } switch (rpz_type) { case DNS_RPZ_TYPE_CLIENT_IP: zbits &= have.client_ipv6; break; case DNS_RPZ_TYPE_IP: zbits &= have.ipv6; break; case DNS_RPZ_TYPE_NSIP: zbits &= have.nsipv6; break; default: UNREACHABLE(); break; } } else { return (DNS_RPZ_INVALID_NUM); } if (zbits == 0) { return (DNS_RPZ_INVALID_NUM); } make_addr_set(&tgt_set, zbits, rpz_type); RWLOCK(&rpzs->search_lock, isc_rwlocktype_read); result = search(rpzs, &tgt_ip, 128, &tgt_set, false, &found); if (result == ISC_R_NOTFOUND) { /* * There are no eligible zones for this IP address. */ RWUNLOCK(&rpzs->search_lock, isc_rwlocktype_read); return (DNS_RPZ_INVALID_NUM); } /* * Construct the trigger name for the longest matching trigger * in the first eligible zone with a match. */ *prefixp = found->prefix; switch (rpz_type) { case DNS_RPZ_TYPE_CLIENT_IP: rpz_num = zbit_to_num(found->set.client_ip & tgt_set.client_ip); break; case DNS_RPZ_TYPE_IP: rpz_num = zbit_to_num(found->set.ip & tgt_set.ip); break; case DNS_RPZ_TYPE_NSIP: rpz_num = zbit_to_num(found->set.nsip & tgt_set.nsip); break; default: UNREACHABLE(); } result = ip2name(&found->ip, found->prefix, dns_rootname, ip_name); RWUNLOCK(&rpzs->search_lock, isc_rwlocktype_read); if (result != ISC_R_SUCCESS) { /* * bin/tests/system/rpz/tests.sh looks for "rpz.*failed". */ isc_log_write(dns_lctx, DNS_LOGCATEGORY_RPZ, DNS_LOGMODULE_RBTDB, DNS_RPZ_ERROR_LEVEL, "rpz ip2name() failed: %s", isc_result_totext(result)); return (DNS_RPZ_INVALID_NUM); } return (rpz_num); } /* * Search the summary radix tree for policy zones with triggers matching * a name. */ dns_rpz_zbits_t dns_rpz_find_name(dns_rpz_zones_t *rpzs, dns_rpz_type_t rpz_type, dns_rpz_zbits_t zbits, dns_name_t *trig_name) { char namebuf[DNS_NAME_FORMATSIZE]; dns_rbtnode_t *nmnode = NULL; const dns_rpz_nm_data_t *nm_data = NULL; dns_rpz_zbits_t found_zbits; dns_rbtnodechain_t chain; isc_result_t result; int i; if (zbits == 0) { return (0); } found_zbits = 0; dns_rbtnodechain_init(&chain); RWLOCK(&rpzs->search_lock, isc_rwlocktype_read); nmnode = NULL; result = dns_rbt_findnode(rpzs->rbt, trig_name, NULL, &nmnode, &chain, DNS_RBTFIND_EMPTYDATA, NULL, NULL); switch (result) { case ISC_R_SUCCESS: nm_data = nmnode->data; if (nm_data != NULL) { if (rpz_type == DNS_RPZ_TYPE_QNAME) { found_zbits = nm_data->set.qname; } else { found_zbits = nm_data->set.ns; } } FALLTHROUGH; case DNS_R_PARTIALMATCH: i = chain.level_matches; nmnode = chain.levels[chain.level_matches]; /* * Whenever an exact match is found by dns_rbt_findnode(), * the highest level node in the chain will not be put into * chain->levels[] array, but instead the chain->end * pointer will be adjusted to point to that node. * * Suppose we have the following entries in a rpz zone: * example.com CNAME rpz-passthru. * *.example.com CNAME rpz-passthru. * * A query for www.example.com would result in the * following chain object returned by dns_rbt_findnode(): * chain->level_count = 2 * chain->level_matches = 2 * chain->levels[0] = . * chain->levels[1] = example.com * chain->levels[2] = NULL * chain->end = www * * Since exact matches only care for testing rpz set bits, * we need to test for rpz wild bits through iterating the * nodechain, and that includes testing the rpz wild bits * in the highest level node found. In the case of an exact * match, chain->levels[chain->level_matches] will be NULL, * to address that we must use chain->end as the start * point, then iterate over the remaining levels in the * chain. */ if (nmnode == NULL) { --i; nmnode = chain.end; } while (nmnode != NULL) { nm_data = nmnode->data; if (nm_data != NULL) { if (rpz_type == DNS_RPZ_TYPE_QNAME) { found_zbits |= nm_data->wild.qname; } else { found_zbits |= nm_data->wild.ns; } } if (i >= 0) { nmnode = chain.levels[i]; --i; } else { break; } } break; case ISC_R_NOTFOUND: break; default: /* * bin/tests/system/rpz/tests.sh looks for "rpz.*failed". */ dns_name_format(trig_name, namebuf, sizeof(namebuf)); isc_log_write(dns_lctx, DNS_LOGCATEGORY_RPZ, DNS_LOGMODULE_RBTDB, DNS_RPZ_ERROR_LEVEL, "dns_rpz_find_name(%s) failed: %s", namebuf, isc_result_totext(result)); break; } RWUNLOCK(&rpzs->search_lock, isc_rwlocktype_read); dns_rbtnodechain_invalidate(&chain); return (zbits & found_zbits); } /* * Translate CNAME rdata to a QNAME response policy action. */ dns_rpz_policy_t dns_rpz_decode_cname(dns_rpz_zone_t *rpz, dns_rdataset_t *rdataset, dns_name_t *selfname) { dns_rdata_t rdata = DNS_RDATA_INIT; dns_rdata_cname_t cname; isc_result_t result; result = dns_rdataset_first(rdataset); INSIST(result == ISC_R_SUCCESS); dns_rdataset_current(rdataset, &rdata); result = dns_rdata_tostruct(&rdata, &cname, NULL); INSIST(result == ISC_R_SUCCESS); dns_rdata_reset(&rdata); /* * CNAME . means NXDOMAIN */ if (dns_name_equal(&cname.cname, dns_rootname)) { return (DNS_RPZ_POLICY_NXDOMAIN); } if (dns_name_iswildcard(&cname.cname)) { /* * CNAME *. means NODATA */ if (dns_name_countlabels(&cname.cname) == 2) { return (DNS_RPZ_POLICY_NODATA); } /* * A qname of www.evil.com and a policy of * *.evil.com CNAME *.garden.net * gives a result of * evil.com CNAME evil.com.garden.net */ if (dns_name_countlabels(&cname.cname) > 2) { return (DNS_RPZ_POLICY_WILDCNAME); } } /* * CNAME rpz-tcp-only. means "send truncated UDP responses." */ if (dns_name_equal(&cname.cname, &rpz->tcp_only)) { return (DNS_RPZ_POLICY_TCP_ONLY); } /* * CNAME rpz-drop. means "do not respond." */ if (dns_name_equal(&cname.cname, &rpz->drop)) { return (DNS_RPZ_POLICY_DROP); } /* * CNAME rpz-passthru. means "do not rewrite." */ if (dns_name_equal(&cname.cname, &rpz->passthru)) { return (DNS_RPZ_POLICY_PASSTHRU); } /* * 128.1.0.127.rpz-ip CNAME 128.1.0.0.127. is obsolete PASSTHRU */ if (selfname != NULL && dns_name_equal(&cname.cname, selfname)) { return (DNS_RPZ_POLICY_PASSTHRU); } /* * Any other rdata gives a response consisting of the rdata. */ return (DNS_RPZ_POLICY_RECORD); }