You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
185 lines
8.0 KiB
185 lines
8.0 KiB
From bcb4e65f7ab49fd94b002ff9e1bba24237082726 Mon Sep 17 00:00:00 2001
|
|
From: Jacek Migacz <jmigacz@redhat.com>
|
|
Date: Mon, 26 Feb 2024 14:05:37 +0100
|
|
Subject: [PATCH] resolved: limit the number of signature validations in a
|
|
transaction
|
|
|
|
It has been demonstrated that tolerating an unbounded number of dnssec
|
|
signature validations is a bad idea. It is easy for a maliciously
|
|
crafted DNS reply to contain as many keytag collisions as desired,
|
|
causing us to iterate every dnskey and signature combination in vain.
|
|
|
|
The solution is to impose a maximum number of validations we will
|
|
tolerate. While collisions are not hard to craft, I still expect they
|
|
are unlikely in the wild so it should be safe to pick fairly small
|
|
values.
|
|
|
|
Here two limits are imposed: one on the maximum number of invalid
|
|
signatures encountered per rrset, and another on the total number of
|
|
validations performed per transaction.
|
|
|
|
(cherry picked from commit 67d0ce8843d612a2245d0966197d4f528b911b66)
|
|
|
|
Resolves: RHEL-26643
|
|
---
|
|
src/resolve/resolved-dns-dnssec.c | 16 ++++++++++++++--
|
|
src/resolve/resolved-dns-dnssec.h | 9 ++++++++-
|
|
src/resolve/resolved-dns-transaction.c | 19 ++++++++++++++++---
|
|
3 files changed, 38 insertions(+), 6 deletions(-)
|
|
|
|
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c
|
|
index 426ea945ca..de2660e317 100644
|
|
--- a/src/resolve/resolved-dns-dnssec.c
|
|
+++ b/src/resolve/resolved-dns-dnssec.c
|
|
@@ -1176,6 +1176,7 @@ int dnssec_verify_rrset_search(
|
|
DnsResourceRecord **ret_rrsig) {
|
|
|
|
bool found_rrsig = false, found_invalid = false, found_expired_rrsig = false, found_unsupported_algorithm = false;
|
|
+ unsigned nvalidations = 0;
|
|
DnsResourceRecord *rrsig;
|
|
int r;
|
|
|
|
@@ -1221,6 +1222,14 @@ int dnssec_verify_rrset_search(
|
|
if (realtime == USEC_INFINITY)
|
|
realtime = now(CLOCK_REALTIME);
|
|
|
|
+ /* Have we seen an unreasonable number of invalid signaures? */
|
|
+ if (nvalidations > DNSSEC_INVALID_MAX) {
|
|
+ if (ret_rrsig)
|
|
+ *ret_rrsig = NULL;
|
|
+ *result = DNSSEC_TOO_MANY_VALIDATIONS;
|
|
+ return (int) nvalidations;
|
|
+ }
|
|
+
|
|
/* Yay, we found a matching RRSIG with a matching
|
|
* DNSKEY, awesome. Now let's verify all entries of
|
|
* the RRSet against the RRSIG and DNSKEY
|
|
@@ -1230,6 +1239,8 @@ int dnssec_verify_rrset_search(
|
|
if (r < 0)
|
|
return r;
|
|
|
|
+ nvalidations++;
|
|
+
|
|
switch (one_result) {
|
|
|
|
case DNSSEC_VALIDATED:
|
|
@@ -1240,7 +1251,7 @@ int dnssec_verify_rrset_search(
|
|
*ret_rrsig = rrsig;
|
|
|
|
*result = one_result;
|
|
- return 0;
|
|
+ return (int) nvalidations;
|
|
|
|
case DNSSEC_INVALID:
|
|
/* If the signature is invalid, let's try another
|
|
@@ -1287,7 +1298,7 @@ int dnssec_verify_rrset_search(
|
|
if (ret_rrsig)
|
|
*ret_rrsig = NULL;
|
|
|
|
- return 0;
|
|
+ return (int) nvalidations;
|
|
}
|
|
|
|
int dnssec_has_rrsig(DnsAnswer *a, const DnsResourceKey *key) {
|
|
@@ -2571,6 +2582,7 @@ static const char* const dnssec_result_table[_DNSSEC_RESULT_MAX] = {
|
|
[DNSSEC_FAILED_AUXILIARY] = "failed-auxiliary",
|
|
[DNSSEC_NSEC_MISMATCH] = "nsec-mismatch",
|
|
[DNSSEC_INCOMPATIBLE_SERVER] = "incompatible-server",
|
|
+ [DNSSEC_TOO_MANY_VALIDATIONS] = "too-many-validations",
|
|
};
|
|
DEFINE_STRING_TABLE_LOOKUP(dnssec_result, DnssecResult);
|
|
|
|
diff --git a/src/resolve/resolved-dns-dnssec.h b/src/resolve/resolved-dns-dnssec.h
|
|
index 954bb3ef9d..29b90130a3 100644
|
|
--- a/src/resolve/resolved-dns-dnssec.h
|
|
+++ b/src/resolve/resolved-dns-dnssec.h
|
|
@@ -9,12 +9,13 @@ typedef enum DnssecVerdict DnssecVerdict;
|
|
#include "resolved-dns-rr.h"
|
|
|
|
enum DnssecResult {
|
|
- /* These five are returned by dnssec_verify_rrset() */
|
|
+ /* These six are returned by dnssec_verify_rrset() */
|
|
DNSSEC_VALIDATED,
|
|
DNSSEC_VALIDATED_WILDCARD, /* Validated via a wildcard RRSIG, further NSEC/NSEC3 checks necessary */
|
|
DNSSEC_INVALID,
|
|
DNSSEC_SIGNATURE_EXPIRED,
|
|
DNSSEC_UNSUPPORTED_ALGORITHM,
|
|
+ DNSSEC_TOO_MANY_VALIDATIONS,
|
|
|
|
/* These two are added by dnssec_verify_rrset_search() */
|
|
DNSSEC_NO_SIGNATURE,
|
|
@@ -45,6 +46,12 @@ enum DnssecVerdict {
|
|
/* The longest digest we'll ever generate, of all digest algorithms we support */
|
|
#define DNSSEC_HASH_SIZE_MAX (MAX(20, 32))
|
|
|
|
+/* The most invalid signatures we will tolerate for a single rrset */
|
|
+#define DNSSEC_INVALID_MAX 5
|
|
+
|
|
+/* The total number of signature validations we will tolerate for a single transaction */
|
|
+#define DNSSEC_VALIDATION_MAX 64
|
|
+
|
|
int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, bool revoked_ok);
|
|
int dnssec_key_match_rrsig(const DnsResourceKey *key, DnsResourceRecord *rrsig);
|
|
|
|
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
|
|
index 0306af84a2..ccca49d399 100644
|
|
--- a/src/resolve/resolved-dns-transaction.c
|
|
+++ b/src/resolve/resolved-dns-transaction.c
|
|
@@ -3140,11 +3140,14 @@ static int dnssec_validate_records(
|
|
DnsTransaction *t,
|
|
Phase phase,
|
|
bool *have_nsec,
|
|
+ unsigned *nvalidations,
|
|
DnsAnswer **validated) {
|
|
|
|
DnsResourceRecord *rr;
|
|
int r;
|
|
|
|
+ assert(nvalidations);
|
|
+
|
|
/* Returns negative on error, 0 if validation failed, 1 to restart validation, 2 when finished. */
|
|
|
|
DNS_ANSWER_FOREACH(rr, t->answer) {
|
|
@@ -3186,6 +3189,7 @@ static int dnssec_validate_records(
|
|
&rrsig);
|
|
if (r < 0)
|
|
return r;
|
|
+ *nvalidations += r;
|
|
|
|
log_debug("Looking at %s: %s", strna(dns_resource_record_to_string(rr)), dnssec_result_to_string(result));
|
|
|
|
@@ -3383,7 +3387,8 @@ static int dnssec_validate_records(
|
|
DNSSEC_SIGNATURE_EXPIRED,
|
|
DNSSEC_NO_SIGNATURE))
|
|
manager_dnssec_verdict(t->scope->manager, DNSSEC_BOGUS, rr->key);
|
|
- else /* DNSSEC_MISSING_KEY or DNSSEC_UNSUPPORTED_ALGORITHM */
|
|
+ else /* DNSSEC_MISSING_KEY, DNSSEC_UNSUPPORTED_ALGORITHM,
|
|
+ or DNSSEC_TOO_MANY_VALIDATIONS */
|
|
manager_dnssec_verdict(t->scope->manager, DNSSEC_INDETERMINATE, rr->key);
|
|
|
|
/* This is a primary response to our question, and it failed validation.
|
|
@@ -3476,13 +3481,21 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
|
|
return r;
|
|
|
|
phase = DNSSEC_PHASE_DNSKEY;
|
|
- for (;;) {
|
|
+ for (unsigned nvalidations = 0;;) {
|
|
bool have_nsec = false;
|
|
|
|
- r = dnssec_validate_records(t, phase, &have_nsec, &validated);
|
|
+ r = dnssec_validate_records(t, phase, &have_nsec, &nvalidations, &validated);
|
|
if (r <= 0)
|
|
return r;
|
|
|
|
+ if (nvalidations > DNSSEC_VALIDATION_MAX) {
|
|
+ /* This reply requires an onerous number of signature validations to verify. Let's
|
|
+ * not waste our time trying, as this shouldn't happen for well-behaved domains
|
|
+ * anyway. */
|
|
+ t->answer_dnssec_result = DNSSEC_TOO_MANY_VALIDATIONS;
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
/* Try again as long as we managed to achieve something */
|
|
if (r == 1)
|
|
continue;
|