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- Fix stub zone queries leaking to the internet for

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harden-referral-path ns checks.


git-svn-id: file:///svn/unbound/trunk@4226 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards 2017-06-15 07:59:05 +00:00
parent 7ebe1fe115
commit 39b5f5bbc6
2 changed files with 34 additions and 27 deletions
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4
doc/Changelog
View file

@ -1,3 +1,7 @@
15 June 2017: Wouter
- Fix stub zone queries leaking to the internet for
harden-referral-path ns checks.
13 June 2017: Wouter
- Fix #1279: Memory leak on reload when python module is enabled.
- Fix #1280: Unbound fails assert when response from authoritative

57
iterator/iterator.c
View file

@ -525,6 +525,33 @@ handle_cname_response(struct module_qstate* qstate, struct iter_qstate* iq,
return 1;
}
/** see if last resort is possible - does config allow queries to parent */
static int
can_have_last_resort(struct module_env* env, uint8_t* nm, size_t nmlen,
uint16_t qclass)
{
struct delegpt* fwddp;
struct iter_hints_stub* stub;
int labs = dname_count_labels(nm);
/* do not process a last resort (the parent side) if a stub
* or forward is configured, because we do not want to go 'above'
* the configured servers */
if(!dname_is_root(nm) && (stub = (struct iter_hints_stub*)
name_tree_find(&env->hints->tree, nm, nmlen, labs, qclass)) &&
/* has_parent side is turned off for stub_first, where we
* are allowed to go to the parent */
stub->dp->has_parent_side_NS) {
return 0;
}
if((fwddp = forwards_find(env->fwds, nm, qclass)) &&
/* has_parent_side is turned off for forward_first, where
* we are allowed to go to the parent */
fwddp->has_parent_side_NS) {
return 0;
}
return 1;
}
/** see if target name is caps-for-id whitelisted */
static int
is_caps_whitelisted(struct iter_env* ie, struct iter_qstate* iq)
@ -869,6 +896,9 @@ generate_ns_check(struct module_qstate* qstate, struct iter_qstate* iq, int id)
if(iq->depth == ie->max_dependency_depth)
return;
if(!can_have_last_resort(qstate->env, iq->dp->name, iq->dp->namelen,
iq->qchase.qclass))
return;
/* is this query the same as the nscheck? */
if(qstate->qinfo.qtype == LDNS_RR_TYPE_NS &&
query_dname_compare(iq->dp->name, qstate->qinfo.qname)==0 &&
@ -1574,33 +1604,6 @@ query_for_targets(struct module_qstate* qstate, struct iter_qstate* iq,
return 1;
}
/** see if last resort is possible - does config allow queries to parent */
static int
can_have_last_resort(struct module_env* env, uint8_t* nm, size_t nmlen,
uint16_t qclass)
{
struct delegpt* fwddp;
struct iter_hints_stub* stub;
int labs = dname_count_labels(nm);
/* do not process a last resort (the parent side) if a stub
* or forward is configured, because we do not want to go 'above'
* the configured servers */
if(!dname_is_root(nm) && (stub = (struct iter_hints_stub*)
name_tree_find(&env->hints->tree, nm, nmlen, labs, qclass)) &&
/* has_parent side is turned off for stub_first, where we
* are allowed to go to the parent */
stub->dp->has_parent_side_NS) {
return 0;
}
if((fwddp = forwards_find(env->fwds, nm, qclass)) &&
/* has_parent_side is turned off for forward_first, where
* we are allowed to go to the parent */
fwddp->has_parent_side_NS) {
return 0;
}
return 1;
}
/**
* Called by processQueryTargets when it would like extra targets to query
* but it seems to be out of options. At last resort some less appealing