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-rw-r--r--src/libsystemd/sd-bus/bus-common-errors.h2
-rw-r--r--src/resolve/RFCs10
-rw-r--r--src/resolve/resolved-bus.c5
-rw-r--r--src/resolve/resolved-dns-answer.c86
-rw-r--r--src/resolve/resolved-dns-answer.h2
-rw-r--r--src/resolve/resolved-dns-cache.c17
-rw-r--r--src/resolve/resolved-dns-cache.h2
-rw-r--r--src/resolve/resolved-dns-dnssec.c99
-rw-r--r--src/resolve/resolved-dns-dnssec.h14
-rw-r--r--src/resolve/resolved-dns-rr.h26
-rw-r--r--src/resolve/resolved-dns-transaction.c125
-rw-r--r--src/resolve/resolved-dns-transaction.h4
-rw-r--r--src/resolve/resolved-dns-trust-anchor.c183
-rw-r--r--src/resolve/resolved-dns-trust-anchor.h2
-rw-r--r--src/resolve/resolved-mdns.c2
-rw-r--r--src/resolve/test-dnssec.c14
-rw-r--r--src/systemd/sd-messages.h1
17 files changed, 512 insertions, 82 deletions
diff --git a/src/libsystemd/sd-bus/bus-common-errors.h b/src/libsystemd/sd-bus/bus-common-errors.h
index 9076993f01..9e49725843 100644
--- a/src/libsystemd/sd-bus/bus-common-errors.h
+++ b/src/libsystemd/sd-bus/bus-common-errors.h
@@ -74,6 +74,8 @@
#define BUS_ERROR_ABORTED "org.freedesktop.resolve1.Aborted"
#define BUS_ERROR_CONNECTION_FAILURE "org.freedesktop.resolve1.ConnectionFailure"
#define BUS_ERROR_NO_SUCH_SERVICE "org.freedesktop.resolve1.NoSuchService"
+#define BUS_ERROR_DNSSEC_FAILED "org.freedesktop.resolve1.DnssecFailed"
+#define BUS_ERROR_NO_TRUST_ANCHOR "org.freedesktop.resolve1.NoTrustAnchor"
#define _BUS_ERROR_DNS "org.freedesktop.resolve1.DnsError."
#define BUS_ERROR_NO_SUCH_TRANSFER "org.freedesktop.import1.NoSuchTransfer"
diff --git a/src/resolve/RFCs b/src/resolve/RFCs
index ccc7f0d640..33f4dd9cb6 100644
--- a/src/resolve/RFCs
+++ b/src/resolve/RFCs
@@ -9,7 +9,7 @@ Y https://tools.ietf.org/html/rfc1034 → DOMAIN NAMES - CONCEPTS AND FACILITIES
Y https://tools.ietf.org/html/rfc1035 → DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION
? https://tools.ietf.org/html/rfc1101 → DNS Encoding of Network Names and Other Types
Y https://tools.ietf.org/html/rfc1123 → Requirements for Internet Hosts -- Application and Support
- https://tools.ietf.org/html/rfc1464 → Using the Domain Name System To Store Arbitrary String Attributes
+~ https://tools.ietf.org/html/rfc1464 → Using the Domain Name System To Store Arbitrary String Attributes
Y https://tools.ietf.org/html/rfc1536 → Common DNS Implementation Errors and Suggested Fixes
Y https://tools.ietf.org/html/rfc1876 → A Means for Expressing Location Information in the Domain Name System
Y https://tools.ietf.org/html/rfc2181 → Clarifications to the DNS Specification
@@ -30,9 +30,9 @@ Y https://tools.ietf.org/html/rfc4509 → Use of SHA-256 in DNSSEC Delegation Si
~ https://tools.ietf.org/html/rfc4592 → The Role of Wildcards in the Domain Name System
~ https://tools.ietf.org/html/rfc4697 → Observed DNS Resolution Misbehavior
Y https://tools.ietf.org/html/rfc4795 → Link-Local Multicast Name Resolution (LLMNR)
-! https://tools.ietf.org/html/rfc5011 → Automated Updates of DNS Security (DNSSEC) Trust Anchors
+Y https://tools.ietf.org/html/rfc5011 → Automated Updates of DNS Security (DNSSEC) Trust Anchors
https://tools.ietf.org/html/rfc5155 → DNS Security (DNSSEC) Hashed Authenticated Denial of Existence
- https://tools.ietf.org/html/rfc5452 → Measures for Making DNS More Resilient against Forged Answers
+Y https://tools.ietf.org/html/rfc5452 → Measures for Making DNS More Resilient against Forged Answers
Y https://tools.ietf.org/html/rfc5702 → Use of SHA-2 Algorithms with RSA in DNSKEY and RRSIG Resource Records for DNSSEC
Y https://tools.ietf.org/html/rfc5890 → Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework
Y https://tools.ietf.org/html/rfc5891 → Internationalized Domain Names in Applications (IDNA): Protocol
@@ -41,7 +41,7 @@ Y https://tools.ietf.org/html/rfc6303 → Locally Served DNS Zones
https://tools.ietf.org/html/rfc6604 → xNAME RCODE and Status Bits Clarification
Y https://tools.ietf.org/html/rfc6605 → Elliptic Curve Digital Signature Algorithm (DSA) for DNSSEC
https://tools.ietf.org/html/rfc6672 → DNAME Redirection in the DNS
- https://tools.ietf.org/html/rfc6731 → Improved Recursive DNS Server Selection for Multi-Interfaced Nodes
+! https://tools.ietf.org/html/rfc6731 → Improved Recursive DNS Server Selection for Multi-Interfaced Nodes
Y https://tools.ietf.org/html/rfc6761 → Special-Use Domain Names
https://tools.ietf.org/html/rfc6762 → Multicast DNS
https://tools.ietf.org/html/rfc6763 → DNS-Based Service Discovery
@@ -51,7 +51,7 @@ Y https://tools.ietf.org/html/rfc6891 → Extension Mechanisms for DNS (EDNS(0))
Y https://tools.ietf.org/html/rfc6944 → Applicability Statement: DNS Security (DNSSEC) DNSKEY Algorithm Implementation Status
Y https://tools.ietf.org/html/rfc6975 → Signaling Cryptographic Algorithm Understanding in DNS Security Extensions (DNSSEC)
https://tools.ietf.org/html/rfc7129 → Authenticated Denial of Existence in the DNS
-! https://tools.ietf.org/html/rfc7646 → Definition and Use of DNSSEC Negative Trust Anchors
+Y https://tools.ietf.org/html/rfc7646 → Definition and Use of DNSSEC Negative Trust Anchors
~ https://tools.ietf.org/html/rfc7719 → DNS Terminology
Also relevant:
diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c
index 4d4c1ca014..db180a51a3 100644
--- a/src/resolve/resolved-bus.c
+++ b/src/resolve/resolved-bus.c
@@ -64,9 +64,12 @@ static int reply_query_state(DnsQuery *q) {
return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "Query aborted");
case DNS_TRANSACTION_DNSSEC_FAILED:
- return sd_bus_reply_method_errorf(q->request, BUS_ERROR_ABORTED, "DNSSEC validation failed: %s",
+ return sd_bus_reply_method_errorf(q->request, BUS_ERROR_DNSSEC_FAILED, "DNSSEC validation failed: %s",
dnssec_result_to_string(q->answer_dnssec_result));
+ case DNS_TRANSACTION_NO_TRUST_ANCHOR:
+ return sd_bus_reply_method_errorf(q->request, BUS_ERROR_NO_TRUST_ANCHOR, "No suitable trust anchor known");
+
case DNS_TRANSACTION_RCODE_FAILURE: {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
diff --git a/src/resolve/resolved-dns-answer.c b/src/resolve/resolved-dns-answer.c
index 445999f545..b50558e280 100644
--- a/src/resolve/resolved-dns-answer.c
+++ b/src/resolve/resolved-dns-answer.c
@@ -524,6 +524,92 @@ int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key) {
return 1;
}
+int dns_answer_remove_by_rr(DnsAnswer **a, DnsResourceRecord *rm) {
+ bool found = false, other = false;
+ DnsResourceRecord *rr;
+ unsigned i;
+ int r;
+
+ assert(a);
+ assert(rm);
+
+ /* Remove all entries matching the specified RR from *a */
+
+ DNS_ANSWER_FOREACH(rr, *a) {
+ r = dns_resource_record_equal(rr, rm);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ found = true;
+ else
+ other = true;
+
+ if (found && other)
+ break;
+ }
+
+ if (!found)
+ return 0;
+
+ if (!other) {
+ *a = dns_answer_unref(*a); /* Return NULL for the empty answer */
+ return 1;
+ }
+
+ if ((*a)->n_ref > 1) {
+ _cleanup_(dns_answer_unrefp) DnsAnswer *copy = NULL;
+ DnsAnswerFlags flags;
+ int ifindex;
+
+ copy = dns_answer_new((*a)->n_rrs);
+ if (!copy)
+ return -ENOMEM;
+
+ DNS_ANSWER_FOREACH_FULL(rr, ifindex, flags, *a) {
+ r = dns_resource_record_equal(rr, rm);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
+
+ r = dns_answer_add_raw(copy, rr, ifindex, flags);
+ if (r < 0)
+ return r;
+ }
+
+ dns_answer_unref(*a);
+ *a = copy;
+ copy = NULL;
+
+ return 1;
+ }
+
+ /* Only a single reference, edit in-place */
+
+ i = 0;
+ for (;;) {
+ if (i >= (*a)->n_rrs)
+ break;
+
+ r = dns_resource_record_equal((*a)->items[i].rr, rm);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ /* Kill this entry */
+
+ dns_resource_record_unref((*a)->items[i].rr);
+ memmove((*a)->items + i, (*a)->items + i + 1, sizeof(DnsAnswerItem) * ((*a)->n_rrs - i - 1));
+ (*a)->n_rrs --;
+ continue;
+
+ } else
+ /* Keep this entry */
+ i++;
+ }
+
+ return 1;
+}
+
int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags) {
DnsResourceRecord *rr_source;
int ifindex_source, r;
diff --git a/src/resolve/resolved-dns-answer.h b/src/resolve/resolved-dns-answer.h
index 28ded3b252..715e487d94 100644
--- a/src/resolve/resolved-dns-answer.h
+++ b/src/resolve/resolved-dns-answer.h
@@ -77,6 +77,8 @@ int dns_answer_reserve(DnsAnswer **a, unsigned n_free);
int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free);
int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key);
+int dns_answer_remove_by_rr(DnsAnswer **a, DnsResourceRecord *rr);
+
int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key, DnsAnswerFlags or_flags);
int dns_answer_move_by_key(DnsAnswer **to, DnsAnswer **from, const DnsResourceKey *key, DnsAnswerFlags or_flags);
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index 1c7dd56b3b..301f383809 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -273,13 +273,13 @@ static DnsCacheItem* dns_cache_get(DnsCache *c, DnsResourceRecord *rr) {
return NULL;
}
-static usec_t calculate_until(DnsResourceRecord *rr, usec_t timestamp, bool use_soa_minimum) {
+static usec_t calculate_until(DnsResourceRecord *rr, uint32_t nsec_ttl, usec_t timestamp, bool use_soa_minimum) {
uint32_t ttl;
usec_t u;
assert(rr);
- ttl = rr->ttl;
+ ttl = MIN(rr->ttl, nsec_ttl);
if (rr->key->type == DNS_TYPE_SOA && use_soa_minimum) {
/* If this is a SOA RR, and it is requested, clamp to
* the SOA's minimum field. This is used when we do
@@ -339,7 +339,7 @@ static void dns_cache_item_update_positive(
dns_resource_key_unref(i->key);
i->key = dns_resource_key_ref(rr->key);
- i->until = calculate_until(rr, timestamp, false);
+ i->until = calculate_until(rr, (uint32_t) -1, timestamp, false);
i->authenticated = authenticated;
i->shared_owner = shared_owner;
@@ -420,7 +420,7 @@ static int dns_cache_put_positive(
i->type = DNS_CACHE_POSITIVE;
i->key = dns_resource_key_ref(rr->key);
i->rr = dns_resource_record_ref(rr);
- i->until = calculate_until(rr, timestamp, false);
+ i->until = calculate_until(rr, (uint32_t) -1, timestamp, false);
i->authenticated = authenticated;
i->shared_owner = shared_owner;
i->owner_family = owner_family;
@@ -448,6 +448,7 @@ static int dns_cache_put_negative(
DnsResourceKey *key,
int rcode,
bool authenticated,
+ uint32_t nsec_ttl,
usec_t timestamp,
DnsResourceRecord *soa,
int owner_family,
@@ -470,13 +471,13 @@ static int dns_cache_put_negative(
if (dns_type_is_pseudo(key->type))
return 0;
- if (soa->soa.minimum <= 0 || soa->ttl <= 0) {
+ if (nsec_ttl <= 0 || soa->soa.minimum <= 0 || soa->ttl <= 0) {
if (log_get_max_level() >= LOG_DEBUG) {
r = dns_resource_key_to_string(key, &key_str);
if (r < 0)
return r;
- log_debug("Not caching negative entry with zero SOA TTL: %s", key_str);
+ log_debug("Not caching negative entry with zero SOA/NSEC/NSEC3 TTL: %s", key_str);
}
return 0;
@@ -496,7 +497,7 @@ static int dns_cache_put_negative(
return -ENOMEM;
i->type = rcode == DNS_RCODE_SUCCESS ? DNS_CACHE_NODATA : DNS_CACHE_NXDOMAIN;
- i->until = calculate_until(soa, timestamp, true);
+ i->until = calculate_until(soa, nsec_ttl, timestamp, true);
i->authenticated = authenticated;
i->owner_family = owner_family;
i->owner_address = *owner_address;
@@ -571,6 +572,7 @@ int dns_cache_put(
int rcode,
DnsAnswer *answer,
bool authenticated,
+ uint32_t nsec_ttl,
usec_t timestamp,
int owner_family,
const union in_addr_union *owner_address) {
@@ -669,6 +671,7 @@ int dns_cache_put(
key,
rcode,
authenticated,
+ nsec_ttl,
timestamp,
soa,
owner_family, owner_address);
diff --git a/src/resolve/resolved-dns-cache.h b/src/resolve/resolved-dns-cache.h
index 9c85ca4c58..e61b285df4 100644
--- a/src/resolve/resolved-dns-cache.h
+++ b/src/resolve/resolved-dns-cache.h
@@ -41,7 +41,7 @@ typedef struct DnsCache {
void dns_cache_flush(DnsCache *c);
void dns_cache_prune(DnsCache *c);
-int dns_cache_put(DnsCache *c, DnsResourceKey *key, int rcode, DnsAnswer *answer, bool authenticated, usec_t timestamp, int owner_family, const union in_addr_union *owner_address);
+int dns_cache_put(DnsCache *c, DnsResourceKey *key, int rcode, DnsAnswer *answer, bool authenticated, uint32_t nsec_ttl, usec_t timestamp, int owner_family, const union in_addr_union *owner_address);
int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **answer, bool *authenticated);
int dns_cache_check_conflicts(DnsCache *cache, DnsResourceRecord *rr, int owner_family, const union in_addr_union *owner_address);
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c
index 1182201b7d..32d4834aa1 100644
--- a/src/resolve/resolved-dns-dnssec.c
+++ b/src/resolve/resolved-dns-dnssec.c
@@ -38,11 +38,8 @@
* - wildcard zones compatibility (NSEC/NSEC3 wildcard check is missing)
* - multi-label zone compatibility
* - cname/dname compatibility
- * - per-interface DNSSEC setting
* - nxdomain on qname
- * - retry on failed validation?
- * - DNSSEC key revocation support? https://tools.ietf.org/html/rfc5011
- * - when doing negative caching, use NSEC/NSEC3 RR instead of SOA for TTL
+ * - per-interface DNSSEC setting
*
* */
@@ -79,9 +76,9 @@ static void initialize_libgcrypt(void) {
gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
}
-uint16_t dnssec_keytag(DnsResourceRecord *dnskey) {
+uint16_t dnssec_keytag(DnsResourceRecord *dnskey, bool mask_revoke) {
const uint8_t *p;
- uint32_t sum;
+ uint32_t sum, f;
size_t i;
/* The algorithm from RFC 4034, Appendix B. */
@@ -89,8 +86,12 @@ uint16_t dnssec_keytag(DnsResourceRecord *dnskey) {
assert(dnskey);
assert(dnskey->key->type == DNS_TYPE_DNSKEY);
- sum = (uint32_t) dnskey->dnskey.flags +
- ((((uint32_t) dnskey->dnskey.protocol) << 8) + (uint32_t) dnskey->dnskey.algorithm);
+ f = (uint32_t) dnskey->dnskey.flags;
+
+ if (mask_revoke)
+ f &= ~DNSKEY_FLAG_REVOKE;
+
+ sum = f + ((((uint32_t) dnskey->dnskey.protocol) << 8) + (uint32_t) dnskey->dnskey.algorithm);
p = dnskey->dnskey.key;
@@ -116,15 +117,15 @@ static int rr_compare(const void *a, const void *b) {
assert(*y);
assert((*y)->wire_format);
- m = MIN((*x)->wire_format_size, (*y)->wire_format_size);
+ m = MIN(DNS_RESOURCE_RECORD_RDATA_SIZE(*x), DNS_RESOURCE_RECORD_RDATA_SIZE(*y));
- r = memcmp((*x)->wire_format, (*y)->wire_format, m);
+ r = memcmp(DNS_RESOURCE_RECORD_RDATA(*x), DNS_RESOURCE_RECORD_RDATA(*y), m);
if (r != 0)
return r;
- if ((*x)->wire_format_size < (*y)->wire_format_size)
+ if (DNS_RESOURCE_RECORD_RDATA_SIZE(*x) < DNS_RESOURCE_RECORD_RDATA_SIZE(*y))
return -1;
- else if ((*x)->wire_format_size > (*y)->wire_format_size)
+ else if (DNS_RESOURCE_RECORD_RDATA_SIZE(*x) > DNS_RESOURCE_RECORD_RDATA_SIZE(*y))
return 1;
return 0;
@@ -494,7 +495,7 @@ static int algorithm_to_gcrypt_md(uint8_t algorithm) {
int dnssec_verify_rrset(
DnsAnswer *a,
- DnsResourceKey *key,
+ const DnsResourceKey *key,
DnsResourceRecord *rrsig,
DnsResourceRecord *dnskey,
usec_t realtime,
@@ -605,12 +606,11 @@ int dnssec_verify_rrset(
md_add_uint16(md, rr->key->class);
md_add_uint32(md, rrsig->rrsig.original_ttl);
- assert(rr->wire_format_rdata_offset <= rr->wire_format_size);
- l = rr->wire_format_size - rr->wire_format_rdata_offset;
+ l = DNS_RESOURCE_RECORD_RDATA_SIZE(rr);
assert(l <= 0xFFFF);
md_add_uint16(md, (uint16_t) l);
- gcry_md_write(md, (uint8_t*) rr->wire_format + rr->wire_format_rdata_offset, l);
+ gcry_md_write(md, DNS_RESOURCE_RECORD_RDATA(rr), l);
}
hash = gcry_md_read(md, 0);
@@ -654,7 +654,7 @@ finish:
return r;
}
-int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey) {
+int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, bool revoked_ok) {
assert(rrsig);
assert(dnskey);
@@ -671,12 +671,14 @@ int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnske
return 0;
if ((dnskey->dnskey.flags & DNSKEY_FLAG_ZONE_KEY) == 0)
return 0;
+ if (!revoked_ok && (dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE))
+ return 0;
if (dnskey->dnskey.protocol != 3)
return 0;
if (dnskey->dnskey.algorithm != rrsig->rrsig.algorithm)
return 0;
- if (dnssec_keytag(dnskey) != rrsig->rrsig.key_tag)
+ if (dnssec_keytag(dnskey, false) != rrsig->rrsig.key_tag)
return 0;
return dns_name_equal(DNS_RESOURCE_KEY_NAME(dnskey->key), rrsig->rrsig.signer);
@@ -738,7 +740,7 @@ static int dnssec_fix_rrset_ttl(DnsAnswer *a, const DnsResourceKey *key, DnsReso
int dnssec_verify_rrset_search(
DnsAnswer *a,
- DnsResourceKey *key,
+ const DnsResourceKey *key,
DnsAnswer *validated_dnskeys,
usec_t realtime,
DnssecResult *result) {
@@ -777,7 +779,7 @@ int dnssec_verify_rrset_search(
continue;
/* Is this a DNSKEY RR that matches they key of our RRSIG? */
- r = dnssec_rrsig_match_dnskey(rrsig, dnskey);
+ r = dnssec_rrsig_match_dnskey(rrsig, dnskey, false);
if (r < 0)
return r;
if (r == 0)
@@ -957,7 +959,7 @@ static int digest_to_gcrypt_md(uint8_t algorithm) {
}
}
-int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds) {
+int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds, bool mask_revoke) {
char owner_name[DNSSEC_CANONICAL_HOSTNAME_MAX];
gcry_md_hd_t md = NULL;
size_t hash_size;
@@ -975,12 +977,14 @@ int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds) {
return -EINVAL;
if ((dnskey->dnskey.flags & DNSKEY_FLAG_ZONE_KEY) == 0)
return -EKEYREJECTED;
+ if (!mask_revoke && (dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE))
+ return -EKEYREJECTED;
if (dnskey->dnskey.protocol != 3)
return -EKEYREJECTED;
if (dnskey->dnskey.algorithm != ds->ds.algorithm)
return 0;
- if (dnssec_keytag(dnskey) != ds->ds.key_tag)
+ if (dnssec_keytag(dnskey, mask_revoke) != ds->ds.key_tag)
return 0;
initialize_libgcrypt();
@@ -1004,7 +1008,10 @@ int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds) {
return -EIO;
gcry_md_write(md, owner_name, r);
- md_add_uint16(md, dnskey->dnskey.flags);
+ if (mask_revoke)
+ md_add_uint16(md, dnskey->dnskey.flags & ~DNSKEY_FLAG_REVOKE);
+ else
+ md_add_uint16(md, dnskey->dnskey.flags);
md_add_uint8(md, dnskey->dnskey.protocol);
md_add_uint8(md, dnskey->dnskey.algorithm);
gcry_md_write(md, dnskey->dnskey.key, dnskey->dnskey.key_size);
@@ -1049,7 +1056,9 @@ int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_
if (r == 0)
continue;
- r = dnssec_verify_dnskey(dnskey, ds);
+ r = dnssec_verify_dnskey(dnskey, ds, false);
+ if (r == -EKEYREJECTED)
+ return 0; /* The DNSKEY is revoked or otherwise invalid, we won't bless it */
if (r < 0)
return r;
if (r > 0)
@@ -1073,7 +1082,7 @@ static int nsec3_hash_to_gcrypt_md(uint8_t algorithm) {
}
}
-int dnssec_nsec3_hash(const DnsResourceRecord *nsec3, const char *name, void *ret) {
+int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret) {
uint8_t wire_format[DNS_WIRE_FOMAT_HOSTNAME_MAX];
gcry_md_hd_t md = NULL;
size_t hash_size;
@@ -1089,8 +1098,10 @@ int dnssec_nsec3_hash(const DnsResourceRecord *nsec3, const char *name, void *re
if (nsec3->key->type != DNS_TYPE_NSEC3)
return -EINVAL;
- if (nsec3->nsec3.iterations > NSEC3_ITERATIONS_MAX)
+ if (nsec3->nsec3.iterations > NSEC3_ITERATIONS_MAX) {
+ log_debug("Ignoring NSEC3 RR %s with excessive number of iterations.", dns_resource_record_to_string(nsec3));
return -EOPNOTSUPP;
+ }
algorithm = nsec3_hash_to_gcrypt_md(nsec3->nsec3.algorithm);
if (algorithm < 0)
@@ -1200,7 +1211,7 @@ static int nsec3_is_good(DnsResourceRecord *rr, DnsAnswerFlags flags, DnsResourc
return dns_name_equal(a, b);
}
-static int nsec3_hashed_domain(const DnsResourceRecord *nsec3, const char *domain, const char *zone, char **ret) {
+static int nsec3_hashed_domain(DnsResourceRecord *nsec3, const char *domain, const char *zone, char **ret) {
_cleanup_free_ char *l = NULL, *hashed_domain = NULL;
uint8_t hashed[DNSSEC_HASH_SIZE_MAX];
int hashed_size;
@@ -1238,7 +1249,7 @@ static int nsec3_hashed_domain(const DnsResourceRecord *nsec3, const char *domai
* that there is no proof either way. The latter is the case if a the proof of non-existence of a given
* name uses an NSEC3 record with the opt-out bit set. Lastly, if we are given insufficient NSEC3 records
* to conclude anything we indicate this by returning NO_RR. */
-static int dnssec_test_nsec3(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated) {
+static int dnssec_test_nsec3(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated, uint32_t *ttl) {
_cleanup_free_ char *next_closer_domain = NULL, *wildcard = NULL, *wildcard_domain = NULL;
const char *zone, *p, *pp = NULL;
DnsResourceRecord *rr, *enclosure_rr, *suffix_rr, *wildcard_rr = NULL;
@@ -1248,7 +1259,6 @@ static int dnssec_test_nsec3(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecR
assert(key);
assert(result);
- assert(authenticated);
/* First step, find the zone name and the NSEC3 parameters of the zone.
* it is sufficient to look for the longest common suffix we find with
@@ -1357,7 +1367,10 @@ found_closest_encloser:
else
*result = DNSSEC_NSEC_NODATA;
- *authenticated = a;
+ if (authenticated)
+ *authenticated = a;
+ if (ttl)
+ *ttl = enclosure_rr->ttl;
return 0;
}
@@ -1440,7 +1453,6 @@ found_closest_encloser:
if (!no_closer) {
*result = DNSSEC_NSEC_NO_RR;
-
return 0;
}
@@ -1476,12 +1488,16 @@ found_closest_encloser:
}
}
- *authenticated = a;
+ if (authenticated)
+ *authenticated = a;
+
+ if (ttl)
+ *ttl = enclosure_rr->ttl;
return 0;
}
-int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated) {
+int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated, uint32_t *ttl) {
DnsResourceRecord *rr;
bool have_nsec3 = false;
DnsAnswerFlags flags;
@@ -1489,7 +1505,6 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
assert(key);
assert(result);
- assert(authenticated);
/* Look for any NSEC/NSEC3 RRs that say something about the specified key. */
@@ -1512,7 +1527,12 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
*result = DNSSEC_NSEC_CNAME;
else
*result = DNSSEC_NSEC_NODATA;
- *authenticated = flags & DNS_ANSWER_AUTHENTICATED;
+
+ if (authenticated)
+ *authenticated = flags & DNS_ANSWER_AUTHENTICATED;
+ if (ttl)
+ *ttl = rr->ttl;
+
return 0;
}
@@ -1521,7 +1541,12 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
return r;
if (r > 0) {
*result = DNSSEC_NSEC_NXDOMAIN;
- *authenticated = flags & DNS_ANSWER_AUTHENTICATED;
+
+ if (authenticated)
+ *authenticated = flags & DNS_ANSWER_AUTHENTICATED;
+ if (ttl)
+ *ttl = rr->ttl;
+
return 0;
}
break;
@@ -1534,7 +1559,7 @@ int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *r
/* OK, this was not sufficient. Let's see if NSEC3 can help. */
if (have_nsec3)
- return dnssec_test_nsec3(answer, key, result, authenticated);
+ return dnssec_test_nsec3(answer, key, result, authenticated, ttl);
/* No approproate NSEC RR found, report this. */
*result = DNSSEC_NSEC_NO_RR;
diff --git a/src/resolve/resolved-dns-dnssec.h b/src/resolve/resolved-dns-dnssec.h
index f106875027..94d0b23f80 100644
--- a/src/resolve/resolved-dns-dnssec.h
+++ b/src/resolve/resolved-dns-dnssec.h
@@ -72,22 +72,22 @@ enum DnssecResult {
/* The longest digest we'll ever generate, of all digest algorithms we support */
#define DNSSEC_HASH_SIZE_MAX (MAX(20, 32))
-int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey);
+int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, bool revoked_ok);
int dnssec_key_match_rrsig(const DnsResourceKey *key, DnsResourceRecord *rrsig);
-int dnssec_verify_rrset(DnsAnswer *answer, DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime, DnssecResult *result);
-int dnssec_verify_rrset_search(DnsAnswer *answer, DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime, DnssecResult *result);
+int dnssec_verify_rrset(DnsAnswer *answer, const DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime, DnssecResult *result);
+int dnssec_verify_rrset_search(DnsAnswer *answer, const DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime, DnssecResult *result);
-int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds);
+int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds, bool mask_revoke);
int dnssec_verify_dnskey_search(DnsResourceRecord *dnskey, DnsAnswer *validated_ds);
int dnssec_has_rrsig(DnsAnswer *a, const DnsResourceKey *key);
-uint16_t dnssec_keytag(DnsResourceRecord *dnskey);
+uint16_t dnssec_keytag(DnsResourceRecord *dnskey, bool mask_revoke);
int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max);
-int dnssec_nsec3_hash(const DnsResourceRecord *nsec3, const char *name, void *ret);
+int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret);
typedef enum DnssecNsecResult {
DNSSEC_NSEC_NO_RR, /* No suitable NSEC/NSEC3 RR found */
@@ -99,7 +99,7 @@ typedef enum DnssecNsecResult {
DNSSEC_NSEC_OPTOUT,
} DnssecNsecResult;
-int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated);
+int dnssec_test_nsec(DnsAnswer *answer, DnsResourceKey *key, DnssecNsecResult *result, bool *authenticated, uint32_t *ttl);
const char* dnssec_mode_to_string(DnssecMode m) _const_;
DnssecMode dnssec_mode_from_string(const char *s) _pure_;
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index 90c3629166..26ab36401c 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -34,8 +34,9 @@ typedef struct DnsResourceRecord DnsResourceRecord;
typedef struct DnsTxtItem DnsTxtItem;
/* DNSKEY RR flags */
-#define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8)
#define DNSKEY_FLAG_SEP (UINT16_C(1) << 0)
+#define DNSKEY_FLAG_REVOKE (UINT16_C(1) << 7)
+#define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8)
/* mDNS RR flags */
#define MDNS_RR_CACHE_FLUSH (UINT16_C(1) << 15)
@@ -235,7 +236,7 @@ struct DnsResourceRecord {
};
static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
- if (_unlikely_(!key))
+ if (!key)
return NULL;
if (key->_name)
@@ -244,6 +245,27 @@ static inline const char* DNS_RESOURCE_KEY_NAME(const DnsResourceKey *key) {
return (char*) key + sizeof(DnsResourceKey);
}
+static inline const void* DNS_RESOURCE_RECORD_RDATA(DnsResourceRecord *rr) {
+ if (!rr)
+ return NULL;
+
+ if (!rr->wire_format)
+ return NULL;
+
+ assert(rr->wire_format_rdata_offset <= rr->wire_format_size);
+ return (uint8_t*) rr->wire_format + rr->wire_format_rdata_offset;
+}
+
+static inline size_t DNS_RESOURCE_RECORD_RDATA_SIZE(DnsResourceRecord *rr) {
+ if (!rr)
+ return 0;
+ if (!rr->wire_format)
+ return 0;
+
+ assert(rr->wire_format_rdata_offset <= rr->wire_format_size);
+ return rr->wire_format_size - rr->wire_format_rdata_offset;
+}
+
DnsResourceKey* dns_resource_key_new(uint16_t class, uint16_t type, const char *name);
DnsResourceKey* dns_resource_key_new_redirect(const DnsResourceKey *key, const DnsResourceRecord *cname);
int dns_resource_key_new_append_suffix(DnsResourceKey **ret, DnsResourceKey *key, char *name);
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index f7671e070f..870b7586fd 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -19,6 +19,8 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <sd-messages.h>
+
#include "af-list.h"
#include "alloc-util.h"
#include "dns-domain.h"
@@ -38,6 +40,7 @@ static void dns_transaction_reset_answer(DnsTransaction *t) {
t->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID;
t->answer_authenticated = false;
+ t->answer_nsec_ttl = (uint32_t) -1;
}
static void dns_transaction_close_connection(DnsTransaction *t) {
@@ -62,6 +65,8 @@ DnsTransaction* dns_transaction_free(DnsTransaction *t) {
if (!t)
return NULL;
+ log_debug("Freeing transaction %" PRIu16 ".", t->id);
+
dns_transaction_close_connection(t);
dns_transaction_stop_timeout(t);
@@ -106,16 +111,20 @@ DnsTransaction* dns_transaction_free(DnsTransaction *t) {
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsTransaction*, dns_transaction_free);
-void dns_transaction_gc(DnsTransaction *t) {
+bool dns_transaction_gc(DnsTransaction *t) {
assert(t);
if (t->block_gc > 0)
- return;
+ return true;
if (set_isempty(t->notify_query_candidates) &&
set_isempty(t->notify_zone_items) &&
- set_isempty(t->notify_transactions))
+ set_isempty(t->notify_transactions)) {
dns_transaction_free(t);
+ return false;
+ }
+
+ return true;
}
int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key) {
@@ -149,6 +158,7 @@ int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key)
t->dns_udp_fd = -1;
t->answer_source = _DNS_TRANSACTION_SOURCE_INVALID;
t->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
+ t->answer_nsec_ttl = (uint32_t) -1;
t->key = dns_resource_key_ref(key);
/* Find a fresh, unused transaction id */
@@ -237,6 +247,7 @@ void dns_transaction_complete(DnsTransaction *t, DnsTransactionState state) {
if (state == DNS_TRANSACTION_DNSSEC_FAILED)
log_struct(LOG_NOTICE,
+ LOG_MESSAGE_ID(SD_MESSAGE_DNSSEC_FAILURE),
LOG_MESSAGE("DNSSEC validation failed for question %s: %s", dns_transaction_key_string(t), dnssec_result_to_string(t->answer_dnssec_result)),
"DNS_TRANSACTION=%" PRIu16, t->id,
"DNS_QUESTION=%s", dns_transaction_key_string(t),
@@ -473,6 +484,7 @@ static void dns_transaction_cache_answer(DnsTransaction *t) {
t->answer_rcode,
t->answer,
t->answer_authenticated,
+ t->answer_nsec_ttl,
0,
t->received->family,
&t->received->sender);
@@ -718,7 +730,22 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
t->answer_dnssec_result = _DNSSEC_RESULT_INVALID;
t->answer_authenticated = false;
+ /* Block GC while starting requests for additional DNSSEC RRs */
+ t->block_gc++;
r = dns_transaction_request_dnssec_keys(t);
+ t->block_gc--;
+
+ /* Maybe the transaction is ready for GC'ing now? If so, free it and return. */
+ if (!dns_transaction_gc(t))
+ return;
+
+ /* Requesting additional keys might have resulted in
+ * this transaction to fail, since the auxiliary
+ * request failed for some reason. If so, we are not
+ * in pending state anymore, and we should exit
+ * quickly. */
+ if (t->state != DNS_TRANSACTION_PENDING)
+ return;
if (r < 0) {
dns_transaction_complete(t, DNS_TRANSACTION_RESOURCES);
return;
@@ -902,6 +929,41 @@ static int dns_transaction_prepare(DnsTransaction *t, usec_t ts) {
dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS);
return 0;
}
+
+ if (dns_name_is_root(DNS_RESOURCE_KEY_NAME(t->key)) &&
+ t->key->type == DNS_TYPE_DS) {
+
+ /* Hmm, this is a request for the root DS? A
+ * DS RR doesn't exist in the root zone, and
+ * if our trust anchor didn't know it either,
+ * this means we cannot do any DNSSEC logic
+ * anymore. */
+
+ if (t->scope->dnssec_mode == DNSSEC_DOWNGRADE_OK) {
+ /* We are in downgrade mode. In this
+ * case, synthesize an unsigned empty
+ * response, so that the any lookup
+ * depending on this one can continue
+ * assuming there was no DS, and hence
+ * the root zone was unsigned. */
+
+ t->answer_rcode = DNS_RCODE_SUCCESS;
+ t->answer_source = DNS_TRANSACTION_TRUST_ANCHOR;
+ t->answer_authenticated = false;
+ dns_transaction_complete(t, DNS_TRANSACTION_SUCCESS);
+ } else
+ /* If we are not in downgrade mode,
+ * then fail the lookup, because we
+ * cannot reasonably answer it. There
+ * might be DS RRs, but we don't know
+ * them, and the DNS server won't tell
+ * them to us (and even if it would,
+ * we couldn't validate it and trust
+ * it). */
+ dns_transaction_complete(t, DNS_TRANSACTION_NO_TRUST_ANCHOR);
+
+ return 0;
+ }
}
/* Check the zone, but only if this transaction is not used
@@ -1209,6 +1271,28 @@ int dns_transaction_go(DnsTransaction *t) {
return 1;
}
+static int dns_transaction_find_cyclic(DnsTransaction *t, DnsTransaction *aux) {
+ DnsTransaction *n;
+ Iterator i;
+ int r;
+
+ assert(t);
+ assert(aux);
+
+ /* Try to find cyclic dependencies between transaction objects */
+
+ if (t == aux)
+ return 1;
+
+ SET_FOREACH(n, aux->notify_transactions, i) {
+ r = dns_transaction_find_cyclic(t, n);
+ if (r != 0)
+ return r;
+ }
+
+ return r;
+}
+
static int dns_transaction_add_dnssec_transaction(DnsTransaction *t, DnsResourceKey *key, DnsTransaction **ret) {
DnsTransaction *aux;
int r;
@@ -1227,6 +1311,18 @@ static int dns_transaction_add_dnssec_transaction(DnsTransaction *t, DnsResource
*ret = aux;
return 0;
}
+
+ r = dns_transaction_find_cyclic(t, aux);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ log_debug("Detected potential cyclic dependency, refusing to add transaction %" PRIu16 " (%s) as dependency for %" PRIu16 " (%s).",
+ aux->id,
+ strna(dns_transaction_key_string(aux)),
+ t->id,
+ strna(dns_transaction_key_string(t)));
+ return -ELOOP;
+ }
}
r = set_ensure_allocated(&t->dnssec_transactions, NULL);
@@ -1263,12 +1359,6 @@ static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *
assert(t);
assert(key);
- r = dns_resource_key_equal(t->key, key);
- if (r < 0)
- return r;
- if (r > 0) /* Don't go in circles */
- return 0;
-
/* Try to get the data from the trust anchor */
r = dns_trust_anchor_lookup_positive(&t->scope->manager->trust_anchor, key, &a);
if (r < 0)
@@ -1283,6 +1373,8 @@ static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *
/* This didn't work, ask for it via the network/cache then. */
r = dns_transaction_add_dnssec_transaction(t, key, &aux);
+ if (r == -ELOOP) /* This would result in a cyclic dependency */
+ return 0;
if (r < 0)
return r;
@@ -1292,7 +1384,7 @@ static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *
return r;
}
- return 0;
+ return 1;
}
static int dns_transaction_has_positive_answer(DnsTransaction *t, DnsAnswerFlags *flags) {
@@ -1494,7 +1586,7 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
if (!ds)
return -ENOMEM;
- log_debug("Requesting DS to validate transaction %" PRIu16" (%s, DNSKEY with key tag: %" PRIu16 ").", t->id, DNS_RESOURCE_KEY_NAME(rr->key), dnssec_keytag(rr));
+ log_debug("Requesting DS to validate transaction %" PRIu16" (%s, DNSKEY with key tag: %" PRIu16 ").", t->id, DNS_RESOURCE_KEY_NAME(rr->key), dnssec_keytag(rr, false));
r = dns_transaction_request_dnssec_rr(t, ds);
if (r < 0)
return r;
@@ -2116,6 +2208,14 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
r = dns_answer_copy_by_key(&t->validated_keys, t->answer, rr->key, DNS_ANSWER_AUTHENTICATED);
if (r < 0)
return r;
+
+ /* Maybe warn the user that we
+ * encountered a revoked
+ * DNSKEY for a key from our
+ * trust anchor */
+ r = dns_trust_anchor_check_revoked(&t->scope->manager->trust_anchor, t->answer, rr->key);
+ if (r < 0)
+ return r;
}
/* Add the validated RRset to the new
@@ -2288,7 +2388,7 @@ int dns_transaction_validate_dnssec(DnsTransaction *t) {
bool authenticated = false;
/* Bummer! Let's check NSEC/NSEC3 */
- r = dnssec_test_nsec(t->answer, t->key, &nr, &authenticated);
+ r = dnssec_test_nsec(t->answer, t->key, &nr, &authenticated, &t->answer_nsec_ttl);
if (r < 0)
return r;
@@ -2376,6 +2476,7 @@ static const char* const dns_transaction_state_table[_DNS_TRANSACTION_STATE_MAX]
[DNS_TRANSACTION_CONNECTION_FAILURE] = "connection-failure",
[DNS_TRANSACTION_ABORTED] = "aborted",
[DNS_TRANSACTION_DNSSEC_FAILED] = "dnssec-failed",
+ [DNS_TRANSACTION_NO_TRUST_ANCHOR] = "no-trust-anchor",
};
DEFINE_STRING_TABLE_LOOKUP(dns_transaction_state, DnsTransactionState);
diff --git a/src/resolve/resolved-dns-transaction.h b/src/resolve/resolved-dns-transaction.h
index faf3ce6fb9..ede33f9547 100644
--- a/src/resolve/resolved-dns-transaction.h
+++ b/src/resolve/resolved-dns-transaction.h
@@ -39,6 +39,7 @@ enum DnsTransactionState {
DNS_TRANSACTION_CONNECTION_FAILURE,
DNS_TRANSACTION_ABORTED,
DNS_TRANSACTION_DNSSEC_FAILED,
+ DNS_TRANSACTION_NO_TRUST_ANCHOR,
_DNS_TRANSACTION_STATE_MAX,
_DNS_TRANSACTION_STATE_INVALID = -1
};
@@ -80,6 +81,7 @@ struct DnsTransaction {
int answer_rcode;
DnssecResult answer_dnssec_result;
DnsTransactionSource answer_source;
+ uint32_t answer_nsec_ttl;
/* Indicates whether the primary answer is authenticated,
* i.e. whether the RRs from answer which directly match the
@@ -140,7 +142,7 @@ struct DnsTransaction {
int dns_transaction_new(DnsTransaction **ret, DnsScope *s, DnsResourceKey *key);
DnsTransaction* dns_transaction_free(DnsTransaction *t);
-void dns_transaction_gc(DnsTransaction *t);
+bool dns_transaction_gc(DnsTransaction *t);
int dns_transaction_go(DnsTransaction *t);
void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p);
diff --git a/src/resolve/resolved-dns-trust-anchor.c b/src/resolve/resolved-dns-trust-anchor.c
index 03c5b9406e..53b49b091a 100644
--- a/src/resolve/resolved-dns-trust-anchor.c
+++ b/src/resolve/resolved-dns-trust-anchor.c
@@ -19,6 +19,8 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <sd-messages.h>
+
#include "alloc-util.h"
#include "conf-files.h"
#include "def.h"
@@ -28,11 +30,12 @@
#include "hexdecoct.h"
#include "parse-util.h"
#include "resolved-dns-trust-anchor.h"
+#include "resolved-dns-dnssec.h"
#include "set.h"
#include "string-util.h"
#include "strv.h"
-static const char trust_anchor_dirs[] = CONF_PATHS_NULSTR("systemd/dnssec-trust-anchors.d");
+static const char trust_anchor_dirs[] = CONF_PATHS_NULSTR("dnssec-trust-anchors.d");
/* The DS RR from https://data.iana.org/root-anchors/root-anchors.xml, retrieved December 2015 */
static const uint8_t root_digest[] =
@@ -53,6 +56,9 @@ static int dns_trust_anchor_add_builtin(DnsTrustAnchor *d) {
if (hashmap_get(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, ".")))
return 0;
+ if (hashmap_get(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DNSKEY, ".")))
+ return 0;
+
/* Add the RR from https://data.iana.org/root-anchors/root-anchors.xml */
rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, "");
if (!rr)
@@ -188,6 +194,14 @@ static int dns_trust_anchor_load_positive(DnsTrustAnchor *d, const char *path, u
r = safe_atou16(flags, &f);
if (r < 0)
return log_warning_errno(r, "Failed to parse DNSKEY flags field %s on line %s:%u", flags, path, line);
+ if ((f & DNSKEY_FLAG_ZONE_KEY) == 0) {
+ log_warning("DNSKEY lacks zone key bit set on line %s:%u", path, line);
+ return -EINVAL;
+ }
+ if ((f & DNSKEY_FLAG_REVOKE)) {
+ log_warning("DNSKEY is already revoked on line %s:%u", path, line);
+ return -EINVAL;
+ }
a = dnssec_algorithm_from_string(algorithm);
if (a < 0) {
@@ -405,3 +419,170 @@ int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name) {
return set_contains(d->negative_by_name, name);
}
+
+static int dns_trust_anchor_remove_revoked(DnsTrustAnchor *d, DnsResourceRecord *rr) {
+ _cleanup_(dns_answer_unrefp) DnsAnswer *new_answer = NULL;
+ DnsAnswer *old_answer;
+ int r;
+
+ old_answer = hashmap_get(d->positive_by_key, rr->key);
+ if (!old_answer)
+ return 0;
+
+ new_answer = dns_answer_ref(old_answer);
+
+ r = dns_answer_remove_by_rr(&new_answer, rr);
+ if (r <= 0)
+ return r;
+
+ /* We found the key! Warn the user */
+ log_struct(LOG_WARNING,
+ LOG_MESSAGE_ID(SD_MESSAGE_DNSSEC_TRUST_ANCHOR_REVOKED),
+ LOG_MESSAGE("DNSSEC Trust anchor %s has been revoked. Please update the trust anchor, or upgrade your operating system."), strna(dns_resource_record_to_string(rr)),
+ "TRUST_ANCHOR=%s", dns_resource_record_to_string(rr),
+ NULL);
+
+ if (dns_answer_size(new_answer) <= 0) {
+ assert_se(hashmap_remove(d->positive_by_key, rr->key) == old_answer);
+ dns_answer_unref(old_answer);
+ return 1;
+ }
+
+ r = hashmap_replace(d->positive_by_key, new_answer->items[0].rr->key, new_answer);
+ if (r < 0)
+ return r;
+
+ new_answer = NULL;
+ dns_answer_unref(old_answer);
+ return 1;
+}
+
+static int dns_trust_anchor_check_revoked_one(DnsTrustAnchor *d, DnsResourceRecord *revoked_dnskey) {
+ DnsAnswer *a;
+ int r;
+
+ assert(d);
+ assert(revoked_dnskey);
+ assert(revoked_dnskey->key->type == DNS_TYPE_DNSKEY);
+ assert(revoked_dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE);
+
+ a = hashmap_get(d->positive_by_key, revoked_dnskey->key);
+ if (a) {
+ DnsResourceRecord *anchor;
+
+ /* First, look for the precise DNSKEY in our trust anchor database */
+
+ DNS_ANSWER_FOREACH(anchor, a) {
+
+ if (anchor->dnskey.protocol != revoked_dnskey->dnskey.protocol)
+ continue;
+
+ if (anchor->dnskey.algorithm != revoked_dnskey->dnskey.algorithm)
+ continue;
+
+ if (anchor->dnskey.key_size != revoked_dnskey->dnskey.key_size)
+ continue;
+
+ if (((anchor->dnskey.flags ^ revoked_dnskey->dnskey.flags) | DNSKEY_FLAG_REVOKE) != DNSKEY_FLAG_REVOKE)
+ continue;
+
+ if (memcmp(anchor->dnskey.key, revoked_dnskey->dnskey.key, anchor->dnskey.key_size) != 0)
+ continue;
+
+ dns_trust_anchor_remove_revoked(d, anchor);
+ break;
+ }
+ }
+
+ a = hashmap_get(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(revoked_dnskey->key->class, DNS_TYPE_DS, DNS_RESOURCE_KEY_NAME(revoked_dnskey->key)));
+ if (a) {
+ DnsResourceRecord *anchor;
+
+ /* Second, look for DS RRs matching this DNSKEY in our trust anchor database */
+
+ DNS_ANSWER_FOREACH(anchor, a) {
+
+ r = dnssec_verify_dnskey(revoked_dnskey, anchor, true);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ dns_trust_anchor_remove_revoked(d, anchor);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static bool dns_trust_anchor_knows_domain(DnsTrustAnchor *d, const char *name) {
+ assert(d);
+
+ /* Returns true if there's an entry for the specified domain
+ * name in our trust anchor */
+
+ return
+ hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DNSKEY, name)) ||
+ hashmap_contains(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, name));
+}
+
+int dns_trust_anchor_check_revoked(DnsTrustAnchor *d, DnsAnswer *rrs, const DnsResourceKey *key) {
+ DnsResourceRecord *dnskey;
+ int r;
+
+ assert(d);
+ assert(key);
+
+ /* Looks for self-signed DNSKEY RRs in "rrs" that have been revoked. */
+
+ if (key->type != DNS_TYPE_DNSKEY)
+ return 0;
+
+ DNS_ANSWER_FOREACH(dnskey, rrs) {
+ DnsResourceRecord *rrsig;
+ DnssecResult result;
+
+ r = dns_resource_key_equal(key, dnskey->key);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ /* Is this DNSKEY revoked? */
+ if ((dnskey->dnskey.flags & DNSKEY_FLAG_REVOKE) == 0)
+ continue;
+
+ /* Could this be interesting to us at all? If not,
+ * there's no point in looking for and verifying a
+ * self-signed RRSIG. */
+ if (!dns_trust_anchor_knows_domain(d, DNS_RESOURCE_KEY_NAME(dnskey->key)))
+ continue;
+
+ /* Look for a self-signed RRSIG */
+ DNS_ANSWER_FOREACH(rrsig, rrs) {
+
+ if (rrsig->key->type != DNS_TYPE_RRSIG)
+ continue;
+
+ r = dnssec_rrsig_match_dnskey(rrsig, dnskey, true);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ r = dnssec_verify_rrset(rrs, key, rrsig, dnskey, USEC_INFINITY, &result);
+ if (r < 0)
+ return r;
+ if (result != DNSSEC_VALIDATED)
+ continue;
+
+ /* Bingo! Now, act! */
+ r = dns_trust_anchor_check_revoked_one(d, dnskey);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ return 0;
+}
diff --git a/src/resolve/resolved-dns-trust-anchor.h b/src/resolve/resolved-dns-trust-anchor.h
index 1140cde041..303c4088d1 100644
--- a/src/resolve/resolved-dns-trust-anchor.h
+++ b/src/resolve/resolved-dns-trust-anchor.h
@@ -39,3 +39,5 @@ void dns_trust_anchor_flush(DnsTrustAnchor *d);
int dns_trust_anchor_lookup_positive(DnsTrustAnchor *d, const DnsResourceKey* key, DnsAnswer **answer);
int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name);
+
+int dns_trust_anchor_check_revoked(DnsTrustAnchor *d, DnsAnswer *rrs, const DnsResourceKey *key);
diff --git a/src/resolve/resolved-mdns.c b/src/resolve/resolved-mdns.c
index db23bc9d42..7c1012f4ea 100644
--- a/src/resolve/resolved-mdns.c
+++ b/src/resolve/resolved-mdns.c
@@ -122,7 +122,7 @@ static int on_mdns_packet(sd_event_source *s, int fd, uint32_t revents, void *us
dns_transaction_process_reply(t, p);
}
- dns_cache_put(&scope->cache, NULL, DNS_PACKET_RCODE(p), p->answer, false, 0, p->family, &p->sender);
+ dns_cache_put(&scope->cache, NULL, DNS_PACKET_RCODE(p), p->answer, false, (uint32_t) -1, 0, p->family, &p->sender);
} else if (dns_packet_validate_query(p) > 0) {
log_debug("Got mDNS query packet for id %u", DNS_PACKET_ID(p));
diff --git a/src/resolve/test-dnssec.c b/src/resolve/test-dnssec.c
index 6104d8b4c0..0c9efde1fe 100644
--- a/src/resolve/test-dnssec.c
+++ b/src/resolve/test-dnssec.c
@@ -107,10 +107,10 @@ static void test_dnssec_verify_rrset2(void) {
assert_se(dnskey->dnskey.key);
log_info("DNSKEY: %s", strna(dns_resource_record_to_string(dnskey)));
- log_info("DNSKEY keytag: %u", dnssec_keytag(dnskey));
+ log_info("DNSKEY keytag: %u", dnssec_keytag(dnskey, false));
assert_se(dnssec_key_match_rrsig(nsec->key, rrsig) > 0);
- assert_se(dnssec_rrsig_match_dnskey(rrsig, dnskey) > 0);
+ assert_se(dnssec_rrsig_match_dnskey(rrsig, dnskey, false) > 0);
answer = dns_answer_new(1);
assert_se(answer);
@@ -186,10 +186,10 @@ static void test_dnssec_verify_rrset(void) {
assert_se(dnskey->dnskey.key);
log_info("DNSKEY: %s", strna(dns_resource_record_to_string(dnskey)));
- log_info("DNSKEY keytag: %u", dnssec_keytag(dnskey));
+ log_info("DNSKEY keytag: %u", dnssec_keytag(dnskey, false));
assert_se(dnssec_key_match_rrsig(a->key, rrsig) > 0);
- assert_se(dnssec_rrsig_match_dnskey(rrsig, dnskey) > 0);
+ assert_se(dnssec_rrsig_match_dnskey(rrsig, dnskey, false) > 0);
answer = dns_answer_new(1);
assert_se(answer);
@@ -268,10 +268,10 @@ static void test_dnssec_verify_dns_key(void) {
assert_se(dnskey->dnskey.key);
log_info("DNSKEY: %s", strna(dns_resource_record_to_string(dnskey)));
- log_info("DNSKEY keytag: %u", dnssec_keytag(dnskey));
+ log_info("DNSKEY keytag: %u", dnssec_keytag(dnskey, false));
- assert_se(dnssec_verify_dnskey(dnskey, ds1) > 0);
- assert_se(dnssec_verify_dnskey(dnskey, ds2) > 0);
+ assert_se(dnssec_verify_dnskey(dnskey, ds1, false) > 0);
+ assert_se(dnssec_verify_dnskey(dnskey, ds2, false) > 0);
}
static void test_dnssec_canonicalize_one(const char *original, const char *canonical, int r) {
diff --git a/src/systemd/sd-messages.h b/src/systemd/sd-messages.h
index bc658f62b0..1183df6105 100644
--- a/src/systemd/sd-messages.h
+++ b/src/systemd/sd-messages.h
@@ -87,6 +87,7 @@ _SD_BEGIN_DECLARATIONS;
#define SD_MESSAGE_BOOTCHART SD_ID128_MAKE(9f,26,aa,56,2c,f4,40,c2,b1,6c,77,3d,04,79,b5,18)
#define SD_MESSAGE_DNSSEC_FAILURE SD_ID128_MAKE(16,75,d7,f1,72,17,40,98,b1,10,8b,f8,c7,dc,8f,5d)
+#define SD_MESSAGE_DNSSEC_TRUST_ANCHOR_REVOKED SD_ID128_MAKE(4d,44,08,cf,d0,d1,44,85,91,84,d1,e6,5d,7c,8a,65)
_SD_END_DECLARATIONS;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-14 23:05:40 +0000