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1115 lines
34 KiB
C
1115 lines
34 KiB
C
/*
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* iterator/iter_utils.c - iterative resolver module utility functions.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions to assist the iterator module.
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* Configuration options. Forward zones.
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*/
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#include "config.h"
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#include "iterator/iter_utils.h"
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#include "iterator/iterator.h"
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#include "iterator/iter_hints.h"
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#include "iterator/iter_fwd.h"
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#include "iterator/iter_donotq.h"
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#include "iterator/iter_delegpt.h"
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#include "iterator/iter_priv.h"
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#include "services/cache/infra.h"
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#include "services/cache/dns.h"
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#include "services/cache/rrset.h"
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#include "util/net_help.h"
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#include "util/module.h"
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#include "util/log.h"
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#include "util/config_file.h"
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#include "util/regional.h"
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#include "util/data/msgparse.h"
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#include "util/data/dname.h"
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#include "util/random.h"
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#include "util/fptr_wlist.h"
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#include "validator/val_anchor.h"
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#include "validator/val_kcache.h"
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#include "validator/val_kentry.h"
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#include "validator/val_utils.h"
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#include "validator/val_sigcrypt.h"
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#include "sldns/sbuffer.h"
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#include "sldns/str2wire.h"
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/** time when nameserver glue is said to be 'recent' */
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#define SUSPICION_RECENT_EXPIRY 86400
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/** penalty to validation failed blacklisted IPs */
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#define BLACKLIST_PENALTY (USEFUL_SERVER_TOP_TIMEOUT*4)
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/** fillup fetch policy array */
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static void
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fetch_fill(struct iter_env* ie, const char* str)
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{
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char* s = (char*)str, *e;
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int i;
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for(i=0; i<ie->max_dependency_depth+1; i++) {
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ie->target_fetch_policy[i] = strtol(s, &e, 10);
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if(s == e)
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fatal_exit("cannot parse fetch policy number %s", s);
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s = e;
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}
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}
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/** Read config string that represents the target fetch policy */
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static int
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read_fetch_policy(struct iter_env* ie, const char* str)
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{
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int count = cfg_count_numbers(str);
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if(count < 1) {
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log_err("Cannot parse target fetch policy: \"%s\"", str);
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return 0;
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}
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ie->max_dependency_depth = count - 1;
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ie->target_fetch_policy = (int*)calloc(
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(size_t)ie->max_dependency_depth+1, sizeof(int));
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if(!ie->target_fetch_policy) {
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log_err("alloc fetch policy: out of memory");
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return 0;
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}
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fetch_fill(ie, str);
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return 1;
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}
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/** apply config caps whitelist items to name tree */
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static int
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caps_white_apply_cfg(rbtree_t* ntree, struct config_file* cfg)
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{
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struct config_strlist* p;
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for(p=cfg->caps_whitelist; p; p=p->next) {
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struct name_tree_node* n;
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size_t len;
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uint8_t* nm = sldns_str2wire_dname(p->str, &len);
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if(!nm) {
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log_err("could not parse %s", p->str);
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return 0;
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}
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n = (struct name_tree_node*)calloc(1, sizeof(*n));
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if(!n) {
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log_err("out of memory");
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free(nm);
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return 0;
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}
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n->node.key = n;
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n->name = nm;
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n->len = len;
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n->labs = dname_count_labels(nm);
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n->dclass = LDNS_RR_CLASS_IN;
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if(!name_tree_insert(ntree, n, nm, len, n->labs, n->dclass)) {
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/* duplicate element ignored, idempotent */
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free(n->name);
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free(n);
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}
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}
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name_tree_init_parents(ntree);
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return 1;
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}
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int
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iter_apply_cfg(struct iter_env* iter_env, struct config_file* cfg)
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{
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int i;
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/* target fetch policy */
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if(!read_fetch_policy(iter_env, cfg->target_fetch_policy))
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return 0;
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for(i=0; i<iter_env->max_dependency_depth+1; i++)
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verbose(VERB_QUERY, "target fetch policy for level %d is %d",
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i, iter_env->target_fetch_policy[i]);
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if(!iter_env->donotq)
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iter_env->donotq = donotq_create();
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if(!iter_env->donotq || !donotq_apply_cfg(iter_env->donotq, cfg)) {
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log_err("Could not set donotqueryaddresses");
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return 0;
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}
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if(!iter_env->priv)
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iter_env->priv = priv_create();
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if(!iter_env->priv || !priv_apply_cfg(iter_env->priv, cfg)) {
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log_err("Could not set private addresses");
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return 0;
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}
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if(cfg->caps_whitelist) {
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if(!iter_env->caps_white)
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iter_env->caps_white = rbtree_create(name_tree_compare);
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if(!iter_env->caps_white || !caps_white_apply_cfg(
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iter_env->caps_white, cfg)) {
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log_err("Could not set capsforid whitelist");
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return 0;
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}
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}
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iter_env->supports_ipv6 = cfg->do_ip6;
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iter_env->supports_ipv4 = cfg->do_ip4;
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return 1;
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}
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/** filter out unsuitable targets
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* @param iter_env: iterator environment with ipv6-support flag.
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* @param env: module environment with infra cache.
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* @param name: zone name
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* @param namelen: length of name
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* @param qtype: query type (host order).
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* @param now: current time
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* @param a: address in delegation point we are examining.
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* @return an integer that signals the target suitability.
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* as follows:
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* -1: The address should be omitted from the list.
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* Because:
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* o The address is bogus (DNSSEC validation failure).
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* o Listed as donotquery
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* o is ipv6 but no ipv6 support (in operating system).
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* o is ipv4 but no ipv4 support (in operating system).
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* o is lame
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* Otherwise, an rtt in milliseconds.
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* 0 .. USEFUL_SERVER_TOP_TIMEOUT-1
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* The roundtrip time timeout estimate. less than 2 minutes.
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* Note that util/rtt.c has a MIN_TIMEOUT of 50 msec, thus
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* values 0 .. 49 are not used, unless that is changed.
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* USEFUL_SERVER_TOP_TIMEOUT
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* This value exactly is given for unresponsive blacklisted.
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* USEFUL_SERVER_TOP_TIMEOUT+1
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* For non-blacklisted servers: huge timeout, but has traffic.
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* USEFUL_SERVER_TOP_TIMEOUT*1 ..
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* parent-side lame servers get this penalty. A dispreferential
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* server. (lame in delegpt).
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* USEFUL_SERVER_TOP_TIMEOUT*2 ..
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* dnsseclame servers get penalty
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* USEFUL_SERVER_TOP_TIMEOUT*3 ..
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* recursion lame servers get penalty
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* UNKNOWN_SERVER_NICENESS
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* If no information is known about the server, this is
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* returned. 376 msec or so.
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* +BLACKLIST_PENALTY (of USEFUL_TOP_TIMEOUT*4) for dnssec failed IPs.
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*
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* When a final value is chosen that is dnsseclame ; dnsseclameness checking
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* is turned off (so we do not discard the reply).
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* When a final value is chosen that is recursionlame; RD bit is set on query.
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* Because of the numbers this means recursionlame also have dnssec lameness
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* checking turned off.
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*/
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static int
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iter_filter_unsuitable(struct iter_env* iter_env, struct module_env* env,
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uint8_t* name, size_t namelen, uint16_t qtype, time_t now,
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struct delegpt_addr* a)
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{
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int rtt, lame, reclame, dnsseclame;
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if(a->bogus)
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return -1; /* address of server is bogus */
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if(donotq_lookup(iter_env->donotq, &a->addr, a->addrlen)) {
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log_addr(VERB_ALGO, "skip addr on the donotquery list",
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&a->addr, a->addrlen);
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return -1; /* server is on the donotquery list */
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}
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if(!iter_env->supports_ipv6 && addr_is_ip6(&a->addr, a->addrlen)) {
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return -1; /* there is no ip6 available */
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}
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if(!iter_env->supports_ipv4 && !addr_is_ip6(&a->addr, a->addrlen)) {
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return -1; /* there is no ip4 available */
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}
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/* check lameness - need zone , class info */
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if(infra_get_lame_rtt(env->infra_cache, &a->addr, a->addrlen,
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name, namelen, qtype, &lame, &dnsseclame, &reclame,
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&rtt, now)) {
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log_addr(VERB_ALGO, "servselect", &a->addr, a->addrlen);
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verbose(VERB_ALGO, " rtt=%d%s%s%s%s", rtt,
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lame?" LAME":"",
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dnsseclame?" DNSSEC_LAME":"",
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reclame?" REC_LAME":"",
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a->lame?" ADDR_LAME":"");
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if(lame)
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return -1; /* server is lame */
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else if(rtt >= USEFUL_SERVER_TOP_TIMEOUT)
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/* server is unresponsive,
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* we used to return TOP_TIMEOUT, but fairly useless,
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* because if == TOP_TIMEOUT is dropped because
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* blacklisted later, instead, remove it here, so
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* other choices (that are not blacklisted) can be
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* tried */
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return -1;
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/* select remainder from worst to best */
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else if(reclame)
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return rtt+USEFUL_SERVER_TOP_TIMEOUT*3; /* nonpref */
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else if(dnsseclame || a->dnsseclame)
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return rtt+USEFUL_SERVER_TOP_TIMEOUT*2; /* nonpref */
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else if(a->lame)
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return rtt+USEFUL_SERVER_TOP_TIMEOUT+1; /* nonpref */
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else return rtt;
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}
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/* no server information present */
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if(a->dnsseclame)
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return UNKNOWN_SERVER_NICENESS+USEFUL_SERVER_TOP_TIMEOUT*2; /* nonpref */
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else if(a->lame)
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return USEFUL_SERVER_TOP_TIMEOUT+1+UNKNOWN_SERVER_NICENESS; /* nonpref */
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return UNKNOWN_SERVER_NICENESS;
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}
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/** lookup RTT information, and also store fastest rtt (if any) */
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static int
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iter_fill_rtt(struct iter_env* iter_env, struct module_env* env,
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uint8_t* name, size_t namelen, uint16_t qtype, time_t now,
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struct delegpt* dp, int* best_rtt, struct sock_list* blacklist)
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{
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int got_it = 0;
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struct delegpt_addr* a;
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if(dp->bogus)
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return 0; /* NS bogus, all bogus, nothing found */
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for(a=dp->result_list; a; a = a->next_result) {
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a->sel_rtt = iter_filter_unsuitable(iter_env, env,
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name, namelen, qtype, now, a);
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if(a->sel_rtt != -1) {
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if(sock_list_find(blacklist, &a->addr, a->addrlen))
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a->sel_rtt += BLACKLIST_PENALTY;
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if(!got_it) {
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*best_rtt = a->sel_rtt;
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got_it = 1;
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} else if(a->sel_rtt < *best_rtt) {
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*best_rtt = a->sel_rtt;
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}
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}
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}
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return got_it;
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}
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/** filter the address list, putting best targets at front,
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* returns number of best targets (or 0, no suitable targets) */
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static int
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iter_filter_order(struct iter_env* iter_env, struct module_env* env,
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uint8_t* name, size_t namelen, uint16_t qtype, time_t now,
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struct delegpt* dp, int* selected_rtt, int open_target,
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struct sock_list* blacklist)
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{
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int got_num = 0, low_rtt = 0, swap_to_front;
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struct delegpt_addr* a, *n, *prev=NULL;
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/* fillup sel_rtt and find best rtt in the bunch */
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got_num = iter_fill_rtt(iter_env, env, name, namelen, qtype, now, dp,
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&low_rtt, blacklist);
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if(got_num == 0)
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return 0;
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if(low_rtt >= USEFUL_SERVER_TOP_TIMEOUT &&
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(delegpt_count_missing_targets(dp) > 0 || open_target > 0)) {
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verbose(VERB_ALGO, "Bad choices, trying to get more choice");
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return 0; /* we want more choice. The best choice is a bad one.
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return 0 to force the caller to fetch more */
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}
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got_num = 0;
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a = dp->result_list;
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while(a) {
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/* skip unsuitable targets */
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if(a->sel_rtt == -1) {
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prev = a;
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a = a->next_result;
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continue;
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}
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/* classify the server address and determine what to do */
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swap_to_front = 0;
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if(a->sel_rtt >= low_rtt && a->sel_rtt - low_rtt <= RTT_BAND) {
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got_num++;
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swap_to_front = 1;
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} else if(a->sel_rtt<low_rtt && low_rtt-a->sel_rtt<=RTT_BAND) {
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got_num++;
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swap_to_front = 1;
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}
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/* swap to front if necessary, or move to next result */
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if(swap_to_front && prev) {
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n = a->next_result;
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prev->next_result = n;
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a->next_result = dp->result_list;
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dp->result_list = a;
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a = n;
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} else {
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prev = a;
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a = a->next_result;
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}
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}
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*selected_rtt = low_rtt;
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return got_num;
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}
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struct delegpt_addr*
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iter_server_selection(struct iter_env* iter_env,
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struct module_env* env, struct delegpt* dp,
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uint8_t* name, size_t namelen, uint16_t qtype, int* dnssec_lame,
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int* chase_to_rd, int open_target, struct sock_list* blacklist)
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{
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int sel;
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int selrtt;
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struct delegpt_addr* a, *prev;
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int num = iter_filter_order(iter_env, env, name, namelen, qtype,
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*env->now, dp, &selrtt, open_target, blacklist);
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if(num == 0)
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return NULL;
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verbose(VERB_ALGO, "selrtt %d", selrtt);
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if(selrtt > BLACKLIST_PENALTY) {
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if(selrtt-BLACKLIST_PENALTY > USEFUL_SERVER_TOP_TIMEOUT*3) {
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verbose(VERB_ALGO, "chase to "
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"blacklisted recursion lame server");
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*chase_to_rd = 1;
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}
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if(selrtt-BLACKLIST_PENALTY > USEFUL_SERVER_TOP_TIMEOUT*2) {
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verbose(VERB_ALGO, "chase to "
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"blacklisted dnssec lame server");
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*dnssec_lame = 1;
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}
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} else {
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if(selrtt > USEFUL_SERVER_TOP_TIMEOUT*3) {
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verbose(VERB_ALGO, "chase to recursion lame server");
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*chase_to_rd = 1;
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}
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if(selrtt > USEFUL_SERVER_TOP_TIMEOUT*2) {
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verbose(VERB_ALGO, "chase to dnssec lame server");
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*dnssec_lame = 1;
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}
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if(selrtt == USEFUL_SERVER_TOP_TIMEOUT) {
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verbose(VERB_ALGO, "chase to blacklisted lame server");
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return NULL;
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}
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}
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if(num == 1) {
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a = dp->result_list;
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if(++a->attempts < OUTBOUND_MSG_RETRY)
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return a;
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dp->result_list = a->next_result;
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return a;
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}
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/* randomly select a target from the list */
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log_assert(num > 1);
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/* grab secure random number, to pick unexpected server.
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* also we need it to be threadsafe. */
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sel = ub_random_max(env->rnd, num);
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a = dp->result_list;
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prev = NULL;
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while(sel > 0 && a) {
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prev = a;
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a = a->next_result;
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sel--;
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}
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if(!a) /* robustness */
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return NULL;
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if(++a->attempts < OUTBOUND_MSG_RETRY)
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return a;
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/* remove it from the delegation point result list */
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if(prev)
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prev->next_result = a->next_result;
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else dp->result_list = a->next_result;
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return a;
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}
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struct dns_msg*
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dns_alloc_msg(sldns_buffer* pkt, struct msg_parse* msg,
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struct regional* region)
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{
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struct dns_msg* m = (struct dns_msg*)regional_alloc(region,
|
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sizeof(struct dns_msg));
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if(!m)
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return NULL;
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memset(m, 0, sizeof(*m));
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if(!parse_create_msg(pkt, msg, NULL, &m->qinfo, &m->rep, region)) {
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log_err("malloc failure: allocating incoming dns_msg");
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return NULL;
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}
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return m;
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}
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struct dns_msg*
|
|
dns_copy_msg(struct dns_msg* from, struct regional* region)
|
|
{
|
|
struct dns_msg* m = (struct dns_msg*)regional_alloc(region,
|
|
sizeof(struct dns_msg));
|
|
if(!m)
|
|
return NULL;
|
|
m->qinfo = from->qinfo;
|
|
if(!(m->qinfo.qname = regional_alloc_init(region, from->qinfo.qname,
|
|
from->qinfo.qname_len)))
|
|
return NULL;
|
|
if(!(m->rep = reply_info_copy(from->rep, NULL, region)))
|
|
return NULL;
|
|
return m;
|
|
}
|
|
|
|
void
|
|
iter_dns_store(struct module_env* env, struct query_info* msgqinf,
|
|
struct reply_info* msgrep, int is_referral, time_t leeway, int pside,
|
|
struct regional* region, uint16_t flags)
|
|
{
|
|
if(!dns_cache_store(env, msgqinf, msgrep, is_referral, leeway,
|
|
pside, region, flags))
|
|
log_err("out of memory: cannot store data in cache");
|
|
}
|
|
|
|
int
|
|
iter_ns_probability(struct ub_randstate* rnd, int n, int m)
|
|
{
|
|
int sel;
|
|
if(n == m) /* 100% chance */
|
|
return 1;
|
|
/* we do not need secure random numbers here, but
|
|
* we do need it to be threadsafe, so we use this */
|
|
sel = ub_random_max(rnd, m);
|
|
return (sel < n);
|
|
}
|
|
|
|
/** detect dependency cycle for query and target */
|
|
static int
|
|
causes_cycle(struct module_qstate* qstate, uint8_t* name, size_t namelen,
|
|
uint16_t t, uint16_t c)
|
|
{
|
|
struct query_info qinf;
|
|
qinf.qname = name;
|
|
qinf.qname_len = namelen;
|
|
qinf.qtype = t;
|
|
qinf.qclass = c;
|
|
fptr_ok(fptr_whitelist_modenv_detect_cycle(
|
|
qstate->env->detect_cycle));
|
|
return (*qstate->env->detect_cycle)(qstate, &qinf,
|
|
(uint16_t)(BIT_RD|BIT_CD), qstate->is_priming,
|
|
qstate->is_valrec);
|
|
}
|
|
|
|
void
|
|
iter_mark_cycle_targets(struct module_qstate* qstate, struct delegpt* dp)
|
|
{
|
|
struct delegpt_ns* ns;
|
|
for(ns = dp->nslist; ns; ns = ns->next) {
|
|
if(ns->resolved)
|
|
continue;
|
|
/* see if this ns as target causes dependency cycle */
|
|
if(causes_cycle(qstate, ns->name, ns->namelen,
|
|
LDNS_RR_TYPE_AAAA, qstate->qinfo.qclass) ||
|
|
causes_cycle(qstate, ns->name, ns->namelen,
|
|
LDNS_RR_TYPE_A, qstate->qinfo.qclass)) {
|
|
log_nametypeclass(VERB_QUERY, "skipping target due "
|
|
"to dependency cycle (harden-glue: no may "
|
|
"fix some of the cycles)",
|
|
ns->name, LDNS_RR_TYPE_A,
|
|
qstate->qinfo.qclass);
|
|
ns->resolved = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
iter_mark_pside_cycle_targets(struct module_qstate* qstate, struct delegpt* dp)
|
|
{
|
|
struct delegpt_ns* ns;
|
|
for(ns = dp->nslist; ns; ns = ns->next) {
|
|
if(ns->done_pside4 && ns->done_pside6)
|
|
continue;
|
|
/* see if this ns as target causes dependency cycle */
|
|
if(causes_cycle(qstate, ns->name, ns->namelen,
|
|
LDNS_RR_TYPE_A, qstate->qinfo.qclass)) {
|
|
log_nametypeclass(VERB_QUERY, "skipping target due "
|
|
"to dependency cycle", ns->name,
|
|
LDNS_RR_TYPE_A, qstate->qinfo.qclass);
|
|
ns->done_pside4 = 1;
|
|
}
|
|
if(causes_cycle(qstate, ns->name, ns->namelen,
|
|
LDNS_RR_TYPE_AAAA, qstate->qinfo.qclass)) {
|
|
log_nametypeclass(VERB_QUERY, "skipping target due "
|
|
"to dependency cycle", ns->name,
|
|
LDNS_RR_TYPE_AAAA, qstate->qinfo.qclass);
|
|
ns->done_pside6 = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
iter_dp_is_useless(struct query_info* qinfo, uint16_t qflags,
|
|
struct delegpt* dp)
|
|
{
|
|
struct delegpt_ns* ns;
|
|
/* check:
|
|
* o RD qflag is on.
|
|
* o no addresses are provided.
|
|
* o all NS items are required glue.
|
|
* OR
|
|
* o RD qflag is on.
|
|
* o no addresses are provided.
|
|
* o the query is for one of the nameservers in dp,
|
|
* and that nameserver is a glue-name for this dp.
|
|
*/
|
|
if(!(qflags&BIT_RD))
|
|
return 0;
|
|
/* either available or unused targets */
|
|
if(dp->usable_list || dp->result_list)
|
|
return 0;
|
|
|
|
/* see if query is for one of the nameservers, which is glue */
|
|
if( (qinfo->qtype == LDNS_RR_TYPE_A ||
|
|
qinfo->qtype == LDNS_RR_TYPE_AAAA) &&
|
|
dname_subdomain_c(qinfo->qname, dp->name) &&
|
|
delegpt_find_ns(dp, qinfo->qname, qinfo->qname_len))
|
|
return 1;
|
|
|
|
for(ns = dp->nslist; ns; ns = ns->next) {
|
|
if(ns->resolved) /* skip failed targets */
|
|
continue;
|
|
if(!dname_subdomain_c(ns->name, dp->name))
|
|
return 0; /* one address is not required glue */
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
iter_indicates_dnssec(struct module_env* env, struct delegpt* dp,
|
|
struct dns_msg* msg, uint16_t dclass)
|
|
{
|
|
struct trust_anchor* a;
|
|
/* information not available, !env->anchors can be common */
|
|
if(!env || !env->anchors || !dp || !dp->name)
|
|
return 0;
|
|
/* a trust anchor exists with this name, RRSIGs expected */
|
|
if((a=anchor_find(env->anchors, dp->name, dp->namelabs, dp->namelen,
|
|
dclass))) {
|
|
lock_basic_unlock(&a->lock);
|
|
return 1;
|
|
}
|
|
/* see if DS rrset was given, in AUTH section */
|
|
if(msg && msg->rep &&
|
|
reply_find_rrset_section_ns(msg->rep, dp->name, dp->namelen,
|
|
LDNS_RR_TYPE_DS, dclass))
|
|
return 1;
|
|
/* look in key cache */
|
|
if(env->key_cache) {
|
|
struct key_entry_key* kk = key_cache_obtain(env->key_cache,
|
|
dp->name, dp->namelen, dclass, env->scratch, *env->now);
|
|
if(kk) {
|
|
if(query_dname_compare(kk->name, dp->name) == 0) {
|
|
if(key_entry_isgood(kk) || key_entry_isbad(kk)) {
|
|
regional_free_all(env->scratch);
|
|
return 1;
|
|
} else if(key_entry_isnull(kk)) {
|
|
regional_free_all(env->scratch);
|
|
return 0;
|
|
}
|
|
}
|
|
regional_free_all(env->scratch);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
iter_msg_has_dnssec(struct dns_msg* msg)
|
|
{
|
|
size_t i;
|
|
if(!msg || !msg->rep)
|
|
return 0;
|
|
for(i=0; i<msg->rep->an_numrrsets + msg->rep->ns_numrrsets; i++) {
|
|
if(((struct packed_rrset_data*)msg->rep->rrsets[i]->
|
|
entry.data)->rrsig_count > 0)
|
|
return 1;
|
|
}
|
|
/* empty message has no DNSSEC info, with DNSSEC the reply is
|
|
* not empty (NSEC) */
|
|
return 0;
|
|
}
|
|
|
|
int iter_msg_from_zone(struct dns_msg* msg, struct delegpt* dp,
|
|
enum response_type type, uint16_t dclass)
|
|
{
|
|
if(!msg || !dp || !msg->rep || !dp->name)
|
|
return 0;
|
|
/* SOA RRset - always from reply zone */
|
|
if(reply_find_rrset_section_an(msg->rep, dp->name, dp->namelen,
|
|
LDNS_RR_TYPE_SOA, dclass) ||
|
|
reply_find_rrset_section_ns(msg->rep, dp->name, dp->namelen,
|
|
LDNS_RR_TYPE_SOA, dclass))
|
|
return 1;
|
|
if(type == RESPONSE_TYPE_REFERRAL) {
|
|
size_t i;
|
|
/* if it adds a single label, i.e. we expect .com,
|
|
* and referral to example.com. NS ... , then origin zone
|
|
* is .com. For a referral to sub.example.com. NS ... then
|
|
* we do not know, since example.com. may be in between. */
|
|
for(i=0; i<msg->rep->an_numrrsets+msg->rep->ns_numrrsets;
|
|
i++) {
|
|
struct ub_packed_rrset_key* s = msg->rep->rrsets[i];
|
|
if(ntohs(s->rk.type) == LDNS_RR_TYPE_NS &&
|
|
ntohs(s->rk.rrset_class) == dclass) {
|
|
int l = dname_count_labels(s->rk.dname);
|
|
if(l == dp->namelabs + 1 &&
|
|
dname_strict_subdomain(s->rk.dname,
|
|
l, dp->name, dp->namelabs))
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
log_assert(type==RESPONSE_TYPE_ANSWER || type==RESPONSE_TYPE_CNAME);
|
|
/* not a referral, and not lame delegation (upwards), so,
|
|
* any NS rrset must be from the zone itself */
|
|
if(reply_find_rrset_section_an(msg->rep, dp->name, dp->namelen,
|
|
LDNS_RR_TYPE_NS, dclass) ||
|
|
reply_find_rrset_section_ns(msg->rep, dp->name, dp->namelen,
|
|
LDNS_RR_TYPE_NS, dclass))
|
|
return 1;
|
|
/* a DNSKEY set is expected at the zone apex as well */
|
|
/* this is for 'minimal responses' for DNSKEYs */
|
|
if(reply_find_rrset_section_an(msg->rep, dp->name, dp->namelen,
|
|
LDNS_RR_TYPE_DNSKEY, dclass))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* check equality of two rrsets
|
|
* @param k1: rrset
|
|
* @param k2: rrset
|
|
* @return true if equal
|
|
*/
|
|
static int
|
|
rrset_equal(struct ub_packed_rrset_key* k1, struct ub_packed_rrset_key* k2)
|
|
{
|
|
struct packed_rrset_data* d1 = (struct packed_rrset_data*)
|
|
k1->entry.data;
|
|
struct packed_rrset_data* d2 = (struct packed_rrset_data*)
|
|
k2->entry.data;
|
|
size_t i, t;
|
|
if(k1->rk.dname_len != k2->rk.dname_len ||
|
|
k1->rk.flags != k2->rk.flags ||
|
|
k1->rk.type != k2->rk.type ||
|
|
k1->rk.rrset_class != k2->rk.rrset_class ||
|
|
query_dname_compare(k1->rk.dname, k2->rk.dname) != 0)
|
|
return 0;
|
|
if( /* do not check ttl: d1->ttl != d2->ttl || */
|
|
d1->count != d2->count ||
|
|
d1->rrsig_count != d2->rrsig_count ||
|
|
d1->trust != d2->trust ||
|
|
d1->security != d2->security)
|
|
return 0;
|
|
t = d1->count + d1->rrsig_count;
|
|
for(i=0; i<t; i++) {
|
|
if(d1->rr_len[i] != d2->rr_len[i] ||
|
|
/* no ttl check: d1->rr_ttl[i] != d2->rr_ttl[i] ||*/
|
|
memcmp(d1->rr_data[i], d2->rr_data[i],
|
|
d1->rr_len[i]) != 0)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
reply_equal(struct reply_info* p, struct reply_info* q, struct regional* region)
|
|
{
|
|
size_t i;
|
|
if(p->flags != q->flags ||
|
|
p->qdcount != q->qdcount ||
|
|
/* do not check TTL, this may differ */
|
|
/*
|
|
p->ttl != q->ttl ||
|
|
p->prefetch_ttl != q->prefetch_ttl ||
|
|
*/
|
|
p->security != q->security ||
|
|
p->an_numrrsets != q->an_numrrsets ||
|
|
p->ns_numrrsets != q->ns_numrrsets ||
|
|
p->ar_numrrsets != q->ar_numrrsets ||
|
|
p->rrset_count != q->rrset_count)
|
|
return 0;
|
|
for(i=0; i<p->rrset_count; i++) {
|
|
if(!rrset_equal(p->rrsets[i], q->rrsets[i])) {
|
|
if(!rrset_canonical_equal(region, p->rrsets[i],
|
|
q->rrsets[i])) {
|
|
regional_free_all(region);
|
|
return 0;
|
|
}
|
|
regional_free_all(region);
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
caps_strip_reply(struct reply_info* rep)
|
|
{
|
|
size_t i;
|
|
if(!rep) return;
|
|
/* see if message is a referral, in which case the additional and
|
|
* NS record cannot be removed */
|
|
/* referrals have the AA flag unset (strict check, not elsewhere in
|
|
* unbound, but for 0x20 this is very convenient). */
|
|
if(!(rep->flags&BIT_AA))
|
|
return;
|
|
/* remove the additional section from the reply */
|
|
if(rep->ar_numrrsets != 0) {
|
|
verbose(VERB_ALGO, "caps fallback: removing additional section");
|
|
rep->rrset_count -= rep->ar_numrrsets;
|
|
rep->ar_numrrsets = 0;
|
|
}
|
|
/* is there an NS set in the authority section to remove? */
|
|
/* the failure case (Cisco firewalls) only has one rrset in authsec */
|
|
for(i=rep->an_numrrsets; i<rep->an_numrrsets+rep->ns_numrrsets; i++) {
|
|
struct ub_packed_rrset_key* s = rep->rrsets[i];
|
|
if(ntohs(s->rk.type) == LDNS_RR_TYPE_NS) {
|
|
/* remove NS rrset and break from loop (loop limits
|
|
* have changed) */
|
|
/* move last rrset into this position (there is no
|
|
* additional section any more) */
|
|
verbose(VERB_ALGO, "caps fallback: removing NS rrset");
|
|
if(i < rep->rrset_count-1)
|
|
rep->rrsets[i]=rep->rrsets[rep->rrset_count-1];
|
|
rep->rrset_count --;
|
|
rep->ns_numrrsets --;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int caps_failed_rcode(struct reply_info* rep)
|
|
{
|
|
return !(FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NOERROR ||
|
|
FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NXDOMAIN);
|
|
}
|
|
|
|
void
|
|
iter_store_parentside_rrset(struct module_env* env,
|
|
struct ub_packed_rrset_key* rrset)
|
|
{
|
|
struct rrset_ref ref;
|
|
rrset = packed_rrset_copy_alloc(rrset, env->alloc, *env->now);
|
|
if(!rrset) {
|
|
log_err("malloc failure in store_parentside_rrset");
|
|
return;
|
|
}
|
|
rrset->rk.flags |= PACKED_RRSET_PARENT_SIDE;
|
|
rrset->entry.hash = rrset_key_hash(&rrset->rk);
|
|
ref.key = rrset;
|
|
ref.id = rrset->id;
|
|
/* ignore ret: if it was in the cache, ref updated */
|
|
(void)rrset_cache_update(env->rrset_cache, &ref, env->alloc, *env->now);
|
|
}
|
|
|
|
/** fetch NS record from reply, if any */
|
|
static struct ub_packed_rrset_key*
|
|
reply_get_NS_rrset(struct reply_info* rep)
|
|
{
|
|
size_t i;
|
|
for(i=0; i<rep->rrset_count; i++) {
|
|
if(rep->rrsets[i]->rk.type == htons(LDNS_RR_TYPE_NS)) {
|
|
return rep->rrsets[i];
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
iter_store_parentside_NS(struct module_env* env, struct reply_info* rep)
|
|
{
|
|
struct ub_packed_rrset_key* rrset = reply_get_NS_rrset(rep);
|
|
if(rrset) {
|
|
log_rrset_key(VERB_ALGO, "store parent-side NS", rrset);
|
|
iter_store_parentside_rrset(env, rrset);
|
|
}
|
|
}
|
|
|
|
void iter_store_parentside_neg(struct module_env* env,
|
|
struct query_info* qinfo, struct reply_info* rep)
|
|
{
|
|
/* TTL: NS from referral in iq->deleg_msg,
|
|
* or first RR from iq->response,
|
|
* or servfail5secs if !iq->response */
|
|
time_t ttl = NORR_TTL;
|
|
struct ub_packed_rrset_key* neg;
|
|
struct packed_rrset_data* newd;
|
|
if(rep) {
|
|
struct ub_packed_rrset_key* rrset = reply_get_NS_rrset(rep);
|
|
if(!rrset && rep->rrset_count != 0) rrset = rep->rrsets[0];
|
|
if(rrset) ttl = ub_packed_rrset_ttl(rrset);
|
|
}
|
|
/* create empty rrset to store */
|
|
neg = (struct ub_packed_rrset_key*)regional_alloc(env->scratch,
|
|
sizeof(struct ub_packed_rrset_key));
|
|
if(!neg) {
|
|
log_err("out of memory in store_parentside_neg");
|
|
return;
|
|
}
|
|
memset(&neg->entry, 0, sizeof(neg->entry));
|
|
neg->entry.key = neg;
|
|
neg->rk.type = htons(qinfo->qtype);
|
|
neg->rk.rrset_class = htons(qinfo->qclass);
|
|
neg->rk.flags = 0;
|
|
neg->rk.dname = regional_alloc_init(env->scratch, qinfo->qname,
|
|
qinfo->qname_len);
|
|
if(!neg->rk.dname) {
|
|
log_err("out of memory in store_parentside_neg");
|
|
return;
|
|
}
|
|
neg->rk.dname_len = qinfo->qname_len;
|
|
neg->entry.hash = rrset_key_hash(&neg->rk);
|
|
newd = (struct packed_rrset_data*)regional_alloc_zero(env->scratch,
|
|
sizeof(struct packed_rrset_data) + sizeof(size_t) +
|
|
sizeof(uint8_t*) + sizeof(time_t) + sizeof(uint16_t));
|
|
if(!newd) {
|
|
log_err("out of memory in store_parentside_neg");
|
|
return;
|
|
}
|
|
neg->entry.data = newd;
|
|
newd->ttl = ttl;
|
|
/* entry must have one RR, otherwise not valid in cache.
|
|
* put in one RR with empty rdata: those are ignored as nameserver */
|
|
newd->count = 1;
|
|
newd->rrsig_count = 0;
|
|
newd->trust = rrset_trust_ans_noAA;
|
|
newd->rr_len = (size_t*)((uint8_t*)newd +
|
|
sizeof(struct packed_rrset_data));
|
|
newd->rr_len[0] = 0 /* zero len rdata */ + sizeof(uint16_t);
|
|
packed_rrset_ptr_fixup(newd);
|
|
newd->rr_ttl[0] = newd->ttl;
|
|
sldns_write_uint16(newd->rr_data[0], 0 /* zero len rdata */);
|
|
/* store it */
|
|
log_rrset_key(VERB_ALGO, "store parent-side negative", neg);
|
|
iter_store_parentside_rrset(env, neg);
|
|
}
|
|
|
|
int
|
|
iter_lookup_parent_NS_from_cache(struct module_env* env, struct delegpt* dp,
|
|
struct regional* region, struct query_info* qinfo)
|
|
{
|
|
struct ub_packed_rrset_key* akey;
|
|
akey = rrset_cache_lookup(env->rrset_cache, dp->name,
|
|
dp->namelen, LDNS_RR_TYPE_NS, qinfo->qclass,
|
|
PACKED_RRSET_PARENT_SIDE, *env->now, 0);
|
|
if(akey) {
|
|
log_rrset_key(VERB_ALGO, "found parent-side NS in cache", akey);
|
|
dp->has_parent_side_NS = 1;
|
|
/* and mark the new names as lame */
|
|
if(!delegpt_rrset_add_ns(dp, region, akey, 1)) {
|
|
lock_rw_unlock(&akey->entry.lock);
|
|
return 0;
|
|
}
|
|
lock_rw_unlock(&akey->entry.lock);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int iter_lookup_parent_glue_from_cache(struct module_env* env,
|
|
struct delegpt* dp, struct regional* region, struct query_info* qinfo)
|
|
{
|
|
struct ub_packed_rrset_key* akey;
|
|
struct delegpt_ns* ns;
|
|
size_t num = delegpt_count_targets(dp);
|
|
for(ns = dp->nslist; ns; ns = ns->next) {
|
|
/* get cached parentside A */
|
|
akey = rrset_cache_lookup(env->rrset_cache, ns->name,
|
|
ns->namelen, LDNS_RR_TYPE_A, qinfo->qclass,
|
|
PACKED_RRSET_PARENT_SIDE, *env->now, 0);
|
|
if(akey) {
|
|
log_rrset_key(VERB_ALGO, "found parent-side", akey);
|
|
ns->done_pside4 = 1;
|
|
/* a negative-cache-element has no addresses it adds */
|
|
if(!delegpt_add_rrset_A(dp, region, akey, 1))
|
|
log_err("malloc failure in lookup_parent_glue");
|
|
lock_rw_unlock(&akey->entry.lock);
|
|
}
|
|
/* get cached parentside AAAA */
|
|
akey = rrset_cache_lookup(env->rrset_cache, ns->name,
|
|
ns->namelen, LDNS_RR_TYPE_AAAA, qinfo->qclass,
|
|
PACKED_RRSET_PARENT_SIDE, *env->now, 0);
|
|
if(akey) {
|
|
log_rrset_key(VERB_ALGO, "found parent-side", akey);
|
|
ns->done_pside6 = 1;
|
|
/* a negative-cache-element has no addresses it adds */
|
|
if(!delegpt_add_rrset_AAAA(dp, region, akey, 1))
|
|
log_err("malloc failure in lookup_parent_glue");
|
|
lock_rw_unlock(&akey->entry.lock);
|
|
}
|
|
}
|
|
/* see if new (but lame) addresses have become available */
|
|
return delegpt_count_targets(dp) != num;
|
|
}
|
|
|
|
int
|
|
iter_get_next_root(struct iter_hints* hints, struct iter_forwards* fwd,
|
|
uint16_t* c)
|
|
{
|
|
uint16_t c1 = *c, c2 = *c;
|
|
int r1 = hints_next_root(hints, &c1);
|
|
int r2 = forwards_next_root(fwd, &c2);
|
|
if(!r1 && !r2) /* got none, end of list */
|
|
return 0;
|
|
else if(!r1) /* got one, return that */
|
|
*c = c2;
|
|
else if(!r2)
|
|
*c = c1;
|
|
else if(c1 < c2) /* got both take smallest */
|
|
*c = c1;
|
|
else *c = c2;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
iter_scrub_ds(struct dns_msg* msg, struct ub_packed_rrset_key* ns, uint8_t* z)
|
|
{
|
|
/* Only the DS record for the delegation itself is expected.
|
|
* We allow DS for everything between the bailiwick and the
|
|
* zonecut, thus DS records must be at or above the zonecut.
|
|
* And the DS records must be below the server authority zone.
|
|
* The answer section is already scrubbed. */
|
|
size_t i = msg->rep->an_numrrsets;
|
|
while(i < (msg->rep->an_numrrsets + msg->rep->ns_numrrsets)) {
|
|
struct ub_packed_rrset_key* s = msg->rep->rrsets[i];
|
|
if(ntohs(s->rk.type) == LDNS_RR_TYPE_DS &&
|
|
(!ns || !dname_subdomain_c(ns->rk.dname, s->rk.dname)
|
|
|| query_dname_compare(z, s->rk.dname) == 0)) {
|
|
log_nametypeclass(VERB_ALGO, "removing irrelevant DS",
|
|
s->rk.dname, ntohs(s->rk.type),
|
|
ntohs(s->rk.rrset_class));
|
|
memmove(msg->rep->rrsets+i, msg->rep->rrsets+i+1,
|
|
sizeof(struct ub_packed_rrset_key*) *
|
|
(msg->rep->rrset_count-i-1));
|
|
msg->rep->ns_numrrsets--;
|
|
msg->rep->rrset_count--;
|
|
/* stay at same i, but new record */
|
|
continue;
|
|
}
|
|
i++;
|
|
}
|
|
}
|
|
|
|
void iter_dec_attempts(struct delegpt* dp, int d)
|
|
{
|
|
struct delegpt_addr* a;
|
|
for(a=dp->target_list; a; a = a->next_target) {
|
|
if(a->attempts >= OUTBOUND_MSG_RETRY) {
|
|
/* add back to result list */
|
|
a->next_result = dp->result_list;
|
|
dp->result_list = a;
|
|
}
|
|
if(a->attempts > d)
|
|
a->attempts -= d;
|
|
else a->attempts = 0;
|
|
}
|
|
}
|
|
|
|
void iter_merge_retry_counts(struct delegpt* dp, struct delegpt* old)
|
|
{
|
|
struct delegpt_addr* a, *o, *prev;
|
|
for(a=dp->target_list; a; a = a->next_target) {
|
|
o = delegpt_find_addr(old, &a->addr, a->addrlen);
|
|
if(o) {
|
|
log_addr(VERB_ALGO, "copy attempt count previous dp",
|
|
&a->addr, a->addrlen);
|
|
a->attempts = o->attempts;
|
|
}
|
|
}
|
|
prev = NULL;
|
|
a = dp->usable_list;
|
|
while(a) {
|
|
if(a->attempts >= OUTBOUND_MSG_RETRY) {
|
|
log_addr(VERB_ALGO, "remove from usable list dp",
|
|
&a->addr, a->addrlen);
|
|
/* remove from result list */
|
|
if(prev)
|
|
prev->next_usable = a->next_usable;
|
|
else dp->usable_list = a->next_usable;
|
|
/* prev stays the same */
|
|
a = a->next_usable;
|
|
continue;
|
|
}
|
|
prev = a;
|
|
a = a->next_usable;
|
|
}
|
|
}
|
|
|
|
int
|
|
iter_ds_toolow(struct dns_msg* msg, struct delegpt* dp)
|
|
{
|
|
/* if for query example.com, there is example.com SOA or a subdomain
|
|
* of example.com, then we are too low and need to fetch NS. */
|
|
size_t i;
|
|
/* if we have a DNAME or CNAME we are probably wrong */
|
|
/* if we have a qtype DS in the answer section, its fine */
|
|
for(i=0; i < msg->rep->an_numrrsets; i++) {
|
|
struct ub_packed_rrset_key* s = msg->rep->rrsets[i];
|
|
if(ntohs(s->rk.type) == LDNS_RR_TYPE_DNAME ||
|
|
ntohs(s->rk.type) == LDNS_RR_TYPE_CNAME) {
|
|
/* not the right answer, maybe too low, check the
|
|
* RRSIG signer name (if there is any) for a hint
|
|
* that it is from the dp zone anyway */
|
|
uint8_t* sname;
|
|
size_t slen;
|
|
val_find_rrset_signer(s, &sname, &slen);
|
|
if(sname && query_dname_compare(dp->name, sname)==0)
|
|
return 0; /* it is fine, from the right dp */
|
|
return 1;
|
|
}
|
|
if(ntohs(s->rk.type) == LDNS_RR_TYPE_DS)
|
|
return 0; /* fine, we have a DS record */
|
|
}
|
|
for(i=msg->rep->an_numrrsets;
|
|
i < msg->rep->an_numrrsets + msg->rep->ns_numrrsets; i++) {
|
|
struct ub_packed_rrset_key* s = msg->rep->rrsets[i];
|
|
if(ntohs(s->rk.type) == LDNS_RR_TYPE_SOA) {
|
|
if(dname_subdomain_c(s->rk.dname, msg->qinfo.qname))
|
|
return 1; /* point is too low */
|
|
if(query_dname_compare(s->rk.dname, dp->name)==0)
|
|
return 0; /* right dp */
|
|
}
|
|
if(ntohs(s->rk.type) == LDNS_RR_TYPE_NSEC ||
|
|
ntohs(s->rk.type) == LDNS_RR_TYPE_NSEC3) {
|
|
uint8_t* sname;
|
|
size_t slen;
|
|
val_find_rrset_signer(s, &sname, &slen);
|
|
if(sname && query_dname_compare(dp->name, sname)==0)
|
|
return 0; /* it is fine, from the right dp */
|
|
return 1;
|
|
}
|
|
}
|
|
/* we do not know */
|
|
return 1;
|
|
}
|
|
|
|
int iter_dp_cangodown(struct query_info* qinfo, struct delegpt* dp)
|
|
{
|
|
/* no delegation point, do not see how we can go down,
|
|
* robust check, it should really exist */
|
|
if(!dp) return 0;
|
|
|
|
/* see if dp equals the qname, then we cannot go down further */
|
|
if(query_dname_compare(qinfo->qname, dp->name) == 0)
|
|
return 0;
|
|
/* if dp is one label above the name we also cannot go down further */
|
|
if(dname_count_labels(qinfo->qname) == dp->namelabs+1)
|
|
return 0;
|
|
return 1;
|
|
}
|