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-rw-r--r--src/basic/conf-files.c22
-rw-r--r--src/resolve-host/resolve-host.c147
-rw-r--r--src/resolve/RFCs6
-rw-r--r--src/resolve/resolved-dns-dnssec.c10
-rw-r--r--src/resolve/resolved-dns-packet.c2
-rw-r--r--src/resolve/resolved-dns-rr.c33
-rw-r--r--src/resolve/resolved-dns-rr.h4
-rw-r--r--src/resolve/resolved-dns-transaction.c42
-rw-r--r--src/resolve/resolved-dns-trust-anchor.c324
-rw-r--r--src/resolve/resolved-dns-trust-anchor.h6
10 files changed, 539 insertions, 57 deletions
diff --git a/src/basic/conf-files.c b/src/basic/conf-files.c
index 75dad228e3..5854caeb51 100644
--- a/src/basic/conf-files.c
+++ b/src/basic/conf-files.c
@@ -41,6 +41,7 @@
static int files_add(Hashmap *h, const char *root, const char *path, const char *suffix) {
_cleanup_closedir_ DIR *dir = NULL;
const char *dirpath;
+ struct dirent *de;
int r;
assert(path);
@@ -55,18 +56,9 @@ static int files_add(Hashmap *h, const char *root, const char *path, const char
return -errno;
}
- for (;;) {
- struct dirent *de;
+ FOREACH_DIRENT(de, dir, return -errno) {
char *p;
- errno = 0;
- de = readdir(dir);
- if (!de && errno != 0)
- return -errno;
-
- if (!de)
- break;
-
if (!dirent_is_file_with_suffix(de, suffix))
continue;
@@ -116,17 +108,15 @@ static int conf_files_list_strv_internal(char ***strv, const char *suffix, const
STRV_FOREACH(p, dirs) {
r = files_add(fh, root, *p, suffix);
- if (r == -ENOMEM) {
+ if (r == -ENOMEM)
return r;
- } else if (r < 0)
- log_debug_errno(r, "Failed to search for files in %s: %m",
- *p);
+ if (r < 0)
+ log_debug_errno(r, "Failed to search for files in %s, ignoring: %m", *p);
}
files = hashmap_get_strv(fh);
- if (files == NULL) {
+ if (!files)
return -ENOMEM;
- }
qsort_safe(files, hashmap_size(fh), sizeof(char *), base_cmp);
*strv = files;
diff --git a/src/resolve-host/resolve-host.c b/src/resolve-host/resolve-host.c
index dc82769ac6..2cabfeaefa 100644
--- a/src/resolve-host/resolve-host.c
+++ b/src/resolve-host/resolve-host.c
@@ -328,8 +328,7 @@ static int parse_address(const char *s, int *family, union in_addr_union *addres
return 0;
}
-static int resolve_record(sd_bus *bus, const char *name) {
-
+static int resolve_record(sd_bus *bus, const char *name, uint16_t class, uint16_t type) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL;
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
char ifname[IF_NAMESIZE] = "";
@@ -343,7 +342,7 @@ static int resolve_record(sd_bus *bus, const char *name) {
if (arg_ifindex > 0 && !if_indextoname(arg_ifindex, ifname))
return log_error_errno(errno, "Failed to resolve interface name for index %i: %m", arg_ifindex);
- log_debug("Resolving %s %s %s (interface %s).", name, dns_class_to_string(arg_class), dns_type_to_string(arg_type), isempty(ifname) ? "*" : ifname);
+ log_debug("Resolving %s %s %s (interface %s).", name, dns_class_to_string(class), dns_type_to_string(type), isempty(ifname) ? "*" : ifname);
r = sd_bus_message_new_method_call(
bus,
@@ -355,7 +354,7 @@ static int resolve_record(sd_bus *bus, const char *name) {
if (r < 0)
return bus_log_create_error(r);
- r = sd_bus_message_append(req, "isqqt", arg_ifindex, name, arg_class, arg_type, arg_flags);
+ r = sd_bus_message_append(req, "isqqt", arg_ifindex, name, class, type, arg_flags);
if (r < 0)
return bus_log_create_error(r);
@@ -442,6 +441,127 @@ static int resolve_record(sd_bus *bus, const char *name) {
return 0;
}
+static int resolve_rfc4501(sd_bus *bus, const char *name) {
+ uint16_t type = 0, class = 0;
+ const char *p, *q, *n;
+ int r;
+
+ assert(bus);
+ assert(name);
+ assert(startswith(name, "dns:"));
+
+ /* Parse RFC 4501 dns: URIs */
+
+ p = name + 4;
+
+ if (p[0] == '/') {
+ const char *e;
+
+ if (p[1] != '/')
+ goto invalid;
+
+ e = strchr(p + 2, '/');
+ if (!e)
+ goto invalid;
+
+ if (e != p + 2)
+ log_warning("DNS authority specification not supported; ignoring specified authority.");
+
+ p = e + 1;
+ }
+
+ q = strchr(p, '?');
+ if (q) {
+ n = strndupa(p, q - p);
+ q++;
+
+ for (;;) {
+ const char *f;
+
+ f = startswith_no_case(q, "class=");
+ if (f) {
+ _cleanup_free_ char *t = NULL;
+ const char *e;
+
+ if (class != 0) {
+ log_error("DNS class specified twice.");
+ return -EINVAL;
+ }
+
+ e = strchrnul(f, ';');
+ t = strndup(f, e - f);
+ if (!t)
+ return log_oom();
+
+ r = dns_class_from_string(t);
+ if (r < 0) {
+ log_error("Unknown DNS class %s.", t);
+ return -EINVAL;
+ }
+
+ class = r;
+
+ if (*e == ';') {
+ q = e + 1;
+ continue;
+ }
+
+ break;
+ }
+
+ f = startswith_no_case(q, "type=");
+ if (f) {
+ _cleanup_free_ char *t = NULL;
+ const char *e;
+
+ if (type != 0) {
+ log_error("DNS type specified twice.");
+ return -EINVAL;
+ }
+
+ e = strchrnul(f, ';');
+ t = strndup(f, e - f);
+ if (!t)
+ return log_oom();
+
+ r = dns_type_from_string(t);
+ if (r < 0) {
+ log_error("Unknown DNS type %s.", t);
+ return -EINVAL;
+ }
+
+ type = r;
+
+ if (*e == ';') {
+ q = e + 1;
+ continue;
+ }
+
+ break;
+ }
+
+ goto invalid;
+ }
+ } else
+ n = p;
+
+ if (type == 0)
+ type = arg_type;
+ if (type == 0)
+ type = DNS_TYPE_A;
+
+ if (class == 0)
+ class = arg_class;
+ if (class == 0)
+ class = DNS_CLASS_IN;
+
+ return resolve_record(bus, n, class, type);
+
+invalid:
+ log_error("Invalid DNS URI: %s", name);
+ return -EINVAL;
+}
+
static int resolve_service(sd_bus *bus, const char *name, const char *type, const char *domain) {
const char *canonical_name, *canonical_type, *canonical_domain;
_cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL;
@@ -1009,6 +1129,9 @@ static int parse_argv(int argc, char *argv[]) {
if (arg_type != 0 && arg_class == 0)
arg_class = DNS_CLASS_IN;
+ if (arg_class != 0 && arg_type == 0)
+ arg_type = DNS_TYPE_A;
+
return 1 /* work to do */;
}
@@ -1042,11 +1165,15 @@ int main(int argc, char **argv) {
int family, ifindex, k;
union in_addr_union a;
- k = parse_address(argv[optind], &family, &a, &ifindex);
- if (k >= 0)
- k = resolve_address(bus, family, &a, ifindex);
- else
- k = resolve_host(bus, argv[optind]);
+ if (startswith(argv[optind], "dns:"))
+ k = resolve_rfc4501(bus, argv[optind]);
+ else {
+ k = parse_address(argv[optind], &family, &a, &ifindex);
+ if (k >= 0)
+ k = resolve_address(bus, family, &a, ifindex);
+ else
+ k = resolve_host(bus, argv[optind]);
+ }
if (r == 0)
r = k;
@@ -1065,7 +1192,7 @@ int main(int argc, char **argv) {
while (argv[optind]) {
int k;
- k = resolve_record(bus, argv[optind]);
+ k = resolve_record(bus, argv[optind], arg_class, arg_type);
if (r == 0)
r = k;
diff --git a/src/resolve/RFCs b/src/resolve/RFCs
index 8cad108d2c..ccc7f0d640 100644
--- a/src/resolve/RFCs
+++ b/src/resolve/RFCs
@@ -9,6 +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
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
@@ -24,18 +25,23 @@ Y https://tools.ietf.org/html/rfc3597 → Handling of Unknown DNS Resource Recor
Y https://tools.ietf.org/html/rfc4255 → Using DNS to Securely Publish Secure Shell (SSH) Key Fingerprints
Y https://tools.ietf.org/html/rfc4343 → Domain Name System (DNS) Case Insensitivity Clarification
~ https://tools.ietf.org/html/rfc4470 → Minimally Covering NSEC Records and DNSSEC On-line Signing
+Y https://tools.ietf.org/html/rfc4501 → Domain Name System Uniform Resource Identifiers
Y https://tools.ietf.org/html/rfc4509 → Use of SHA-256 in DNSSEC Delegation Signer (DS) Resource Records (RRs)
~ 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
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/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
Y https://tools.ietf.org/html/rfc5966 → DNS Transport over TCP - Implementation Requirements
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
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
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c
index e4b32c7e4b..b7c0b5b824 100644
--- a/src/resolve/resolved-dns-dnssec.c
+++ b/src/resolve/resolved-dns-dnssec.c
@@ -35,7 +35,6 @@
*
* TODO:
*
- * - Make trust anchor store read additional DS+DNSKEY data from disk
* - wildcard zones compatibility (NSEC/NSEC3 wildcard check is missing)
* - multi-label zone compatibility
* - cname/dname compatibility
@@ -53,6 +52,9 @@
/* Permit a maximum clock skew of 1h 10min. This should be enough to deal with DST confusion */
#define SKEW_MAX (1*USEC_PER_HOUR + 10*USEC_PER_MINUTE)
+/* Maximum number of NSEC3 iterations we'll do. */
+#define NSEC3_ITERATIONS_MAX 2048
+
/*
* The DNSSEC Chain of trust:
*
@@ -1087,6 +1089,9 @@ int dnssec_nsec3_hash(DnsResourceRecord *nsec3, const char *name, void *ret) {
if (nsec3->key->type != DNS_TYPE_NSEC3)
return -EINVAL;
+ if (nsec3->nsec3.iterations > NSEC3_ITERATIONS_MAX)
+ return -EOPNOTSUPP;
+
algorithm = nsec3_hash_to_gcrypt_md(nsec3->nsec3.algorithm);
if (algorithm < 0)
return algorithm;
@@ -1155,6 +1160,9 @@ static int nsec3_is_good(DnsResourceRecord *rr, DnsAnswerFlags flags, DnsResourc
/* Ignore NSEC3 RRs whose algorithm we don't know */
if (nsec3_hash_to_gcrypt_md(rr->nsec3.algorithm) < 0)
return 0;
+ /* Ignore NSEC3 RRs with an excessive number of required iterations */
+ if (rr->nsec3.iterations > NSEC3_ITERATIONS_MAX)
+ return 0;
if (!nsec3)
return 1;
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 5cc96308da..4750bf1f5d 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -499,7 +499,7 @@ int dns_packet_append_name(
saved_size = p->size;
- while (*name) {
+ while (!dns_name_is_root(name)) {
const char *z = name;
char label[DNS_LABEL_MAX];
size_t n = 0;
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 274e857586..76723ec4d0 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -308,7 +308,7 @@ const struct hash_ops dns_resource_key_hash_ops = {
int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) {
char cbuf[strlen("CLASS") + DECIMAL_STR_MAX(uint16_t)], tbuf[strlen("TYPE") + DECIMAL_STR_MAX(uint16_t)];
- const char *c, *t;
+ const char *c, *t, *n;
char *s;
/* If we cannot convert the CLASS/TYPE into a known string,
@@ -326,7 +326,8 @@ int dns_resource_key_to_string(const DnsResourceKey *key, char **ret) {
t = tbuf;
}
- if (asprintf(&s, "%s. %s %-5s", DNS_RESOURCE_KEY_NAME(key), c, t) < 0)
+ n = DNS_RESOURCE_KEY_NAME(key);
+ if (asprintf(&s, "%s%s %s %-5s", n, endswith(n, ".") ? "" : ".", c, t) < 0)
return -ENOMEM;
*ret = s;
@@ -915,20 +916,21 @@ const char *dns_resource_record_to_string(DnsResourceRecord *rr) {
break;
case DNS_TYPE_DNSKEY: {
- const char *alg;
+ _cleanup_free_ char *alg = NULL;
- alg = dnssec_algorithm_to_string(rr->dnskey.algorithm);
+ r = dnssec_algorithm_to_string_alloc(rr->dnskey.algorithm, &alg);
+ if (r < 0)
+ return NULL;
t = base64mem(rr->dnskey.key, rr->dnskey.key_size);
if (!t)
return NULL;
- r = asprintf(&s, "%s %u %u %.*s%.*u %s",
+ r = asprintf(&s, "%s %u %u %s %s",
k,
rr->dnskey.flags,
rr->dnskey.protocol,
- alg ? -1 : 0, alg,
- alg ? 0 : 1, alg ? 0u : (unsigned) rr->dnskey.algorithm,
+ alg,
t);
if (r < 0)
return NULL;
@@ -936,11 +938,15 @@ const char *dns_resource_record_to_string(DnsResourceRecord *rr) {
}
case DNS_TYPE_RRSIG: {
- const char *type, *alg;
+ _cleanup_free_ char *alg = NULL;
char expiration[strlen("YYYYMMDDHHmmSS") + 1], inception[strlen("YYYYMMDDHHmmSS") + 1];
+ const char *type;
type = dns_type_to_string(rr->rrsig.type_covered);
- alg = dnssec_algorithm_to_string(rr->rrsig.algorithm);
+
+ r = dnssec_algorithm_to_string_alloc(rr->rrsig.algorithm, &alg);
+ if (r < 0)
+ return NULL;
t = base64mem(rr->rrsig.signature, rr->rrsig.signature_size);
if (!t)
@@ -957,12 +963,11 @@ const char *dns_resource_record_to_string(DnsResourceRecord *rr) {
/* TYPE?? follows
* http://tools.ietf.org/html/rfc3597#section-5 */
- r = asprintf(&s, "%s %s%.*u %.*s%.*u %u %u %s %s %u %s %s",
+ r = asprintf(&s, "%s %s%.*u %s %u %u %s %s %u %s %s",
k,
type ?: "TYPE",
type ? 0 : 1, type ? 0u : (unsigned) rr->rrsig.type_covered,
- alg ? -1 : 0, alg,
- alg ? 0 : 1, alg ? 0u : (unsigned) rr->rrsig.algorithm,
+ alg,
rr->rrsig.labels,
rr->rrsig.original_ttl,
expiration,
@@ -1130,7 +1135,7 @@ static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] =
[DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
[DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
};
-DEFINE_STRING_TABLE_LOOKUP(dnssec_algorithm, int);
+DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_algorithm, int, 255);
static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = {
/* Names as listed on https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
@@ -1139,4 +1144,4 @@ static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = {
[DNSSEC_DIGEST_GOST_R_34_11_94] = "GOST_R_34.11-94",
[DNSSEC_DIGEST_SHA384] = "SHA-384",
};
-DEFINE_STRING_TABLE_LOOKUP(dnssec_digest, int);
+DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(dnssec_digest, int, 255);
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index 27c5f5384e..90c3629166 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -279,8 +279,8 @@ bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b);
extern const struct hash_ops dns_resource_key_hash_ops;
-const char* dnssec_algorithm_to_string(int i) _const_;
+int dnssec_algorithm_to_string_alloc(int i, char **ret);
int dnssec_algorithm_from_string(const char *s) _pure_;
-const char *dnssec_digest_to_string(int i) _const_;
+int dnssec_digest_to_string_alloc(int i, char **ret);
int dnssec_digest_from_string(const char *s) _pure_;
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index fb95554db3..9a03baa9ec 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -588,6 +588,11 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
break;
case DNS_PROTOCOL_DNS:
+ /* Note that we do not need to verify the
+ * addresses/port numbers of incoming traffic, as we
+ * invoked connect() on our UDP socket in which case
+ * the kernel already does the needed verification for
+ * us. */
break;
default:
@@ -887,7 +892,7 @@ static int dns_transaction_prepare(DnsTransaction *t, usec_t ts) {
/* Check the trust anchor. Do so only on classic DNS, since DNSSEC does not apply otherwise. */
if (t->scope->protocol == DNS_PROTOCOL_DNS) {
- r = dns_trust_anchor_lookup(&t->scope->manager->trust_anchor, t->key, &t->answer);
+ r = dns_trust_anchor_lookup_positive(&t->scope->manager->trust_anchor, t->key, &t->answer);
if (r < 0)
return r;
if (r > 0) {
@@ -1265,7 +1270,7 @@ static int dns_transaction_request_dnssec_rr(DnsTransaction *t, DnsResourceKey *
return 0;
/* Try to get the data from the trust anchor */
- r = dns_trust_anchor_lookup(&t->scope->manager->trust_anchor, key, &a);
+ r = dns_trust_anchor_lookup_positive(&t->scope->manager->trust_anchor, key, &a);
if (r < 0)
return r;
if (r > 0) {
@@ -1323,6 +1328,14 @@ static int dns_transaction_has_unsigned_negative_answer(DnsTransaction *t) {
if (r > 0)
return false;
+ /* Is this key explicitly listed as a negative trust anchor?
+ * If so, it's nothing we need to care about */
+ r = dns_trust_anchor_lookup_negative(&t->scope->manager->trust_anchor, DNS_RESOURCE_KEY_NAME(t->key));
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return false;
+
/* The answer does not contain any RRs that match to the
* question. If so, let's see if there are any NSEC/NSEC3 RRs
* included. If not, the answer is unsigned. */
@@ -1407,6 +1420,13 @@ int dns_transaction_request_dnssec_keys(DnsTransaction *t) {
if (dns_type_is_pseudo(rr->key->type))
continue;
+ /* If this RR is in the negative trust anchor, we don't need to validate it. */
+ r = dns_trust_anchor_lookup_negative(&t->scope->manager->trust_anchor, DNS_RESOURCE_KEY_NAME(rr->key));
+ if (r < 0)
+ return r;
+ if (r > 0)
+ continue;
+
switch (rr->key->type) {
case DNS_TYPE_RRSIG: {
@@ -1751,6 +1771,12 @@ static int dns_transaction_requires_rrsig(DnsTransaction *t, DnsResourceRecord *
if (dns_type_is_pseudo(rr->key->type))
return -EINVAL;
+ r = dns_trust_anchor_lookup_negative(&t->scope->manager->trust_anchor, DNS_RESOURCE_KEY_NAME(rr->key));
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return false;
+
switch (rr->key->type) {
case DNS_TYPE_RRSIG:
@@ -1888,6 +1914,12 @@ static int dns_transaction_requires_nsec(DnsTransaction *t) {
if (dns_type_is_pseudo(t->key->type))
return -EINVAL;
+ r = dns_trust_anchor_lookup_negative(&t->scope->manager->trust_anchor, DNS_RESOURCE_KEY_NAME(t->key));
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return false;
+
name = DNS_RESOURCE_KEY_NAME(t->key);
if (IN_SET(t->key->type, DNS_TYPE_SOA, DNS_TYPE_NS, DNS_TYPE_DS)) {
@@ -1939,6 +1971,12 @@ static int dns_transaction_dnskey_authenticated(DnsTransaction *t, DnsResourceRe
* the specified RRset is authenticated (i.e. has a matching
* DS RR). */
+ r = dns_trust_anchor_lookup_negative(&t->scope->manager->trust_anchor, DNS_RESOURCE_KEY_NAME(rr->key));
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return false;
+
DNS_ANSWER_FOREACH(rrsig, t->answer) {
DnsTransaction *dt;
Iterator i;
diff --git a/src/resolve/resolved-dns-trust-anchor.c b/src/resolve/resolved-dns-trust-anchor.c
index 208b7fefc4..03c5b9406e 100644
--- a/src/resolve/resolved-dns-trust-anchor.c
+++ b/src/resolve/resolved-dns-trust-anchor.c
@@ -20,25 +20,37 @@
***/
#include "alloc-util.h"
+#include "conf-files.h"
+#include "def.h"
+#include "dns-domain.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "hexdecoct.h"
+#include "parse-util.h"
#include "resolved-dns-trust-anchor.h"
+#include "set.h"
+#include "string-util.h"
+#include "strv.h"
-/* The DS RR from https://data.iana.org/root-anchors/root-anchors.xml */
+static const char trust_anchor_dirs[] = CONF_PATHS_NULSTR("systemd/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[] =
{ 0x49, 0xAA, 0xC1, 0x1D, 0x7B, 0x6F, 0x64, 0x46, 0x70, 0x2E, 0x54, 0xA1, 0x60, 0x73, 0x71, 0x60,
0x7A, 0x1A, 0x41, 0x85, 0x52, 0x00, 0xFD, 0x2C, 0xE1, 0xCD, 0xDE, 0x32, 0xF2, 0x4E, 0x8F, 0xB5 };
-int dns_trust_anchor_load(DnsTrustAnchor *d) {
+static int dns_trust_anchor_add_builtin(DnsTrustAnchor *d) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
_cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
int r;
assert(d);
- r = hashmap_ensure_allocated(&d->by_key, &dns_resource_key_hash_ops);
+ r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops);
if (r < 0)
return r;
- if (hashmap_get(d->by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, ".")))
+ if (hashmap_get(d->positive_by_key, &DNS_RESOURCE_KEY_CONST(DNS_CLASS_IN, DNS_TYPE_DS, ".")))
return 0;
/* Add the RR from https://data.iana.org/root-anchors/root-anchors.xml */
@@ -62,11 +74,297 @@ int dns_trust_anchor_load(DnsTrustAnchor *d) {
if (r < 0)
return r;
- r = hashmap_put(d->by_key, rr->key, answer);
+ r = hashmap_put(d->positive_by_key, rr->key, answer);
+ if (r < 0)
+ return r;
+
+ answer = NULL;
+ return 0;
+}
+
+static int dns_trust_anchor_load_positive(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) {
+ _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
+ _cleanup_free_ char *domain = NULL, *class = NULL, *type = NULL;
+ _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
+ DnsAnswer *old_answer = NULL;
+ const char *p = s;
+ int r;
+
+ assert(d);
+ assert(line);
+
+ r = extract_first_word(&p, &domain, NULL, EXTRACT_QUOTES);
+ if (r < 0)
+ return log_warning_errno(r, "Unable to parse domain in line %s:%u: %m", path, line);
+
+ if (!dns_name_is_valid(domain)) {
+ log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line);
+ return -EINVAL;
+ }
+
+ r = extract_many_words(&p, NULL, 0, &class, &type, NULL);
+ if (r < 0)
+ return log_warning_errno(r, "Unable to parse class and type in line %s:%u: %m", path, line);
+ if (r != 2) {
+ log_warning("Missing class or type in line %s:%u", path, line);
+ return -EINVAL;
+ }
+
+ if (!strcaseeq(class, "IN")) {
+ log_warning("RR class %s is not supported, ignoring line %s:%u.", class, path, line);
+ return -EINVAL;
+ }
+
+ if (strcaseeq(type, "DS")) {
+ _cleanup_free_ char *key_tag = NULL, *algorithm = NULL, *digest_type = NULL, *digest = NULL;
+ _cleanup_free_ void *dd = NULL;
+ uint16_t kt;
+ int a, dt;
+ size_t l;
+
+ r = extract_many_words(&p, NULL, 0, &key_tag, &algorithm, &digest_type, &digest, NULL);
+ if (r < 0) {
+ log_warning_errno(r, "Failed to parse DS parameters on line %s:%u: %m", path, line);
+ return -EINVAL;
+ }
+ if (r != 4) {
+ log_warning("Missing DS parameters on line %s:%u", path, line);
+ return -EINVAL;
+ }
+
+ r = safe_atou16(key_tag, &kt);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse DS key tag %s on line %s:%u: %m", key_tag, path, line);
+
+ a = dnssec_algorithm_from_string(algorithm);
+ if (a < 0) {
+ log_warning("Failed to parse DS algorithm %s on line %s:%u", algorithm, path, line);
+ return -EINVAL;
+ }
+
+ dt = dnssec_digest_from_string(digest_type);
+ if (dt < 0) {
+ log_warning("Failed to parse DS digest type %s on line %s:%u", digest_type, path, line);
+ return -EINVAL;
+ }
+
+ r = unhexmem(digest, strlen(digest), &dd, &l);
+ if (r < 0) {
+ log_warning("Failed to parse DS digest %s on line %s:%u", digest, path, line);
+ return -EINVAL;
+ }
+
+ rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, domain);
+ if (!rr)
+ return log_oom();
+
+ rr->ds.key_tag = kt;
+ rr->ds.algorithm = a;
+ rr->ds.digest_type = dt;
+ rr->ds.digest_size = l;
+ rr->ds.digest = dd;
+ dd = NULL;
+
+ } else if (strcaseeq(type, "DNSKEY")) {
+ _cleanup_free_ char *flags = NULL, *protocol = NULL, *algorithm = NULL, *key = NULL;
+ _cleanup_free_ void *k = NULL;
+ uint16_t f;
+ size_t l;
+ int a;
+
+ r = extract_many_words(&p, NULL, 0, &flags, &protocol, &algorithm, &key, NULL);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse DNSKEY parameters on line %s:%u: %m", path, line);
+ if (r != 4) {
+ log_warning("Missing DNSKEY parameters on line %s:%u", path, line);
+ return -EINVAL;
+ }
+
+ if (!streq(protocol, "3")) {
+ log_warning("DNSKEY Protocol is not 3 on line %s:%u", path, line);
+ return -EINVAL;
+ }
+
+ 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);
+
+ a = dnssec_algorithm_from_string(algorithm);
+ if (a < 0) {
+ log_warning("Failed to parse DNSKEY algorithm %s on line %s:%u", algorithm, path, line);
+ return -EINVAL;
+ }
+
+ r = unbase64mem(key, strlen(key), &k, &l);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse DNSKEY key data %s on line %s:%u", key, path, line);
+
+ rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DNSKEY, domain);
+ if (!rr)
+ return log_oom();
+
+ rr->dnskey.flags = f;
+ rr->dnskey.protocol = 3;
+ rr->dnskey.algorithm = a;
+ rr->dnskey.key_size = l;
+ rr->dnskey.key = k;
+ k = NULL;
+
+ } else {
+ log_warning("RR type %s is not supported, ignoring line %s:%u.", type, path, line);
+ return -EINVAL;
+ }
+
+ if (!isempty(p)) {
+ log_warning("Trailing garbage on line %s:%u, ignoring line.", path, line);
+ return -EINVAL;
+ }
+
+ r = hashmap_ensure_allocated(&d->positive_by_key, &dns_resource_key_hash_ops);
if (r < 0)
return r;
+ old_answer = hashmap_get(d->positive_by_key, rr->key);
+ answer = dns_answer_ref(old_answer);
+
+ r = dns_answer_add_extend(&answer, rr, 0, DNS_ANSWER_AUTHENTICATED);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add trust anchor RR: %m");
+
+ r = hashmap_replace(d->positive_by_key, rr->key, answer);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add answer to trust anchor: %m");
+
+ old_answer = dns_answer_unref(old_answer);
answer = NULL;
+
+ return 0;
+}
+
+static int dns_trust_anchor_load_negative(DnsTrustAnchor *d, const char *path, unsigned line, const char *s) {
+ _cleanup_free_ char *domain = NULL;
+ const char *p = s;
+ int r;
+
+ assert(d);
+ assert(line);
+
+ r = extract_first_word(&p, &domain, NULL, EXTRACT_QUOTES);
+ if (r < 0)
+ return log_warning_errno(r, "Unable to parse line %s:%u: %m", path, line);
+
+ if (!dns_name_is_valid(domain)) {
+ log_warning("Domain name %s is invalid, at line %s:%u, ignoring line.", domain, path, line);
+ return -EINVAL;
+ }
+
+ if (!isempty(p)) {
+ log_warning("Trailing garbage at line %s:%u, ignoring line.", path, line);
+ return -EINVAL;
+ }
+
+ r = set_ensure_allocated(&d->negative_by_name, &dns_name_hash_ops);
+ if (r < 0)
+ return r;
+
+ r = set_put(d->negative_by_name, domain);
+ if (r < 0)
+ return log_oom();
+ if (r > 0)
+ domain = NULL;
+
+ return 0;
+}
+
+static int dns_trust_anchor_load_files(
+ DnsTrustAnchor *d,
+ const char *suffix,
+ int (*loader)(DnsTrustAnchor *d, const char *path, unsigned n, const char *line)) {
+
+ _cleanup_strv_free_ char **files = NULL;
+ char **f;
+ int r;
+
+ assert(d);
+ assert(suffix);
+ assert(loader);
+
+ r = conf_files_list_nulstr(&files, suffix, NULL, trust_anchor_dirs);
+ if (r < 0)
+ return log_error_errno(r, "Failed to enumerate %s trust anchor files: %m", suffix);
+
+ STRV_FOREACH(f, files) {
+ _cleanup_fclose_ FILE *g = NULL;
+ char line[LINE_MAX];
+ unsigned n = 0;
+
+ g = fopen(*f, "r");
+ if (!g) {
+ if (errno == ENOENT)
+ continue;
+
+ log_warning_errno(errno, "Failed to open %s: %m", *f);
+ continue;
+ }
+
+ FOREACH_LINE(line, g, log_warning_errno(errno, "Failed to read %s, ignoring: %m", *f)) {
+ char *l;
+
+ n++;
+
+ l = strstrip(line);
+ if (isempty(l))
+ continue;
+
+ if (*l == ';')
+ continue;
+
+ (void) loader(d, *f, n, l);
+ }
+ }
+
+ return 0;
+}
+
+static void dns_trust_anchor_dump(DnsTrustAnchor *d) {
+ DnsAnswer *a;
+ Iterator i;
+
+ assert(d);
+
+ log_info("Positive Trust Anchors:");
+ HASHMAP_FOREACH(a, d->positive_by_key, i) {
+ DnsResourceRecord *rr;
+
+ DNS_ANSWER_FOREACH(rr, a)
+ log_info("%s", dns_resource_record_to_string(rr));
+ }
+
+ if (!set_isempty(d->negative_by_name)) {
+ char *n;
+ log_info("Negative trust anchors:");
+
+ SET_FOREACH(n, d->negative_by_name, i)
+ log_info("%s%s", n, endswith(n, ".") ? "" : ".");
+ }
+}
+
+int dns_trust_anchor_load(DnsTrustAnchor *d) {
+ int r;
+
+ assert(d);
+
+ /* If loading things from disk fails, we don't consider this fatal */
+ (void) dns_trust_anchor_load_files(d, ".positive", dns_trust_anchor_load_positive);
+ (void) dns_trust_anchor_load_files(d, ".negative", dns_trust_anchor_load_negative);
+
+ /* However, if the built-in DS fails, then we have a problem. */
+ r = dns_trust_anchor_add_builtin(d);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add trust anchor built-in: %m");
+
+ dns_trust_anchor_dump(d);
+
return 0;
}
@@ -75,13 +373,14 @@ void dns_trust_anchor_flush(DnsTrustAnchor *d) {
assert(d);
- while ((a = hashmap_steal_first(d->by_key)))
+ while ((a = hashmap_steal_first(d->positive_by_key)))
dns_answer_unref(a);
- d->by_key = hashmap_free(d->by_key);
+ d->positive_by_key = hashmap_free(d->positive_by_key);
+ d->negative_by_name = set_free_free(d->negative_by_name);
}
-int dns_trust_anchor_lookup(DnsTrustAnchor *d, DnsResourceKey *key, DnsAnswer **ret) {
+int dns_trust_anchor_lookup_positive(DnsTrustAnchor *d, const DnsResourceKey *key, DnsAnswer **ret) {
DnsAnswer *a;
assert(d);
@@ -92,10 +391,17 @@ int dns_trust_anchor_lookup(DnsTrustAnchor *d, DnsResourceKey *key, DnsAnswer **
if (!IN_SET(key->type, DNS_TYPE_DS, DNS_TYPE_DNSKEY))
return 0;
- a = hashmap_get(d->by_key, key);
+ a = hashmap_get(d->positive_by_key, key);
if (!a)
return 0;
*ret = dns_answer_ref(a);
return 1;
}
+
+int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name) {
+ assert(d);
+ assert(name);
+
+ return set_contains(d->negative_by_name, name);
+}
diff --git a/src/resolve/resolved-dns-trust-anchor.h b/src/resolve/resolved-dns-trust-anchor.h
index 06f3723914..1140cde041 100644
--- a/src/resolve/resolved-dns-trust-anchor.h
+++ b/src/resolve/resolved-dns-trust-anchor.h
@@ -30,10 +30,12 @@ typedef struct DnsTrustAnchor DnsTrustAnchor;
/* This contains a fixed database mapping domain names to DS or DNSKEY records. */
struct DnsTrustAnchor {
- Hashmap *by_key;
+ Hashmap *positive_by_key;
+ Set *negative_by_name;
};
int dns_trust_anchor_load(DnsTrustAnchor *d);
void dns_trust_anchor_flush(DnsTrustAnchor *d);
-int dns_trust_anchor_lookup(DnsTrustAnchor *d, DnsResourceKey* key, DnsAnswer **answer);
+int dns_trust_anchor_lookup_positive(DnsTrustAnchor *d, const DnsResourceKey* key, DnsAnswer **answer);
+int dns_trust_anchor_lookup_negative(DnsTrustAnchor *d, const char *name);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-28 10:44:15 +0000