***/
#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 */
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;
}
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);
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);
+}
projects / platform / upstream / systemd.git / commitdiff