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-rw-r--r--src/hostname/hostnamed.c8
-rw-r--r--src/libsystemd-network/sd-dhcp-client.c2
-rw-r--r--src/resolve/resolved-bus.c12
-rw-r--r--src/resolve/resolved-dns-answer.h25
-rw-r--r--src/resolve/resolved-dns-cache.c45
-rw-r--r--src/resolve/resolved-dns-cache.h1
-rw-r--r--src/resolve/resolved-dns-dnssec.c692
-rw-r--r--src/resolve/resolved-dns-dnssec.h49
-rw-r--r--src/resolve/resolved-dns-packet.c106
-rw-r--r--src/resolve/resolved-dns-packet.h34
-rw-r--r--src/resolve/resolved-dns-question.h13
-rw-r--r--src/resolve/resolved-dns-rr.c78
-rw-r--r--src/resolve/resolved-dns-rr.h49
-rw-r--r--src/resolve/resolved-dns-scope.c6
-rw-r--r--src/resolve/test-dnssec.c217
-rw-r--r--src/shared/dns-domain.c16
-rw-r--r--src/shared/dns-domain.h5
-rw-r--r--src/test/test-dns-domain.c2
18 files changed, 1212 insertions, 148 deletions
diff --git a/src/hostname/hostnamed.c b/src/hostname/hostnamed.c
index e1fbacd11b..d383041d39 100644
--- a/src/hostname/hostnamed.c
+++ b/src/hostname/hostnamed.c
@@ -212,10 +212,10 @@ try_dmi:
unreliable enough, so let's not do any additional guesswork
on top of that.
- See the SMBIOS Specification 2.7.1 section 7.4.1 for
+ See the SMBIOS Specification 4.0 section 7.4.1 for
details about the values listed here:
- http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_2.7.1.pdf
+ https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.0.0.pdf
*/
switch (t) {
@@ -237,7 +237,11 @@ try_dmi:
case 0x11:
case 0x1C:
+ case 0x1D:
return "server";
+
+ case 0x1E:
+ return "tablet";
}
return NULL;
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index a03c8460a8..4521f8f0b1 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -554,7 +554,7 @@ static int client_append_fqdn_option(DHCPMessage *message, size_t optlen, size_t
buffer[1] = 0; /* RCODE1 (deprecated) */
buffer[2] = 0; /* RCODE2 (deprecated) */
- r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3);
+ r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3, false);
if (r > 0)
r = dhcp_option_append(message, optlen, optoffset, 0,
DHCP_OPTION_FQDN, 3 + r, buffer);
diff --git a/src/resolve/resolved-bus.c b/src/resolve/resolved-bus.c
index f86c4ceb05..ddde3af0c3 100644
--- a/src/resolve/resolved-bus.c
+++ b/src/resolve/resolved-bus.c
@@ -425,8 +425,6 @@ fail:
}
static int bus_message_append_rr(sd_bus_message *m, DnsResourceRecord *rr, int ifindex) {
- _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
- size_t start;
int r;
assert(m);
@@ -443,17 +441,11 @@ static int bus_message_append_rr(sd_bus_message *m, DnsResourceRecord *rr, int i
if (r < 0)
return r;
- r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0);
+ r = dns_resource_record_to_wire_format(rr, false);
if (r < 0)
return r;
- p->refuse_compression = true;
-
- r = dns_packet_append_rr(p, rr, &start);
- if (r < 0)
- return r;
-
- r = sd_bus_message_append_array(m, 'y', DNS_PACKET_DATA(p) + start, p->size - start);
+ r = sd_bus_message_append_array(m, 'y', rr->wire_format, rr->wire_format_size);
if (r < 0)
return r;
diff --git a/src/resolve/resolved-dns-answer.h b/src/resolve/resolved-dns-answer.h
index 8814919deb..89c254b02e 100644
--- a/src/resolve/resolved-dns-answer.h
+++ b/src/resolve/resolved-dns-answer.h
@@ -24,6 +24,7 @@
typedef struct DnsAnswer DnsAnswer;
typedef struct DnsAnswerItem DnsAnswerItem;
+#include "macro.h"
#include "resolved-dns-rr.h"
/* A simple array of resource records. We keep track of the
@@ -59,19 +60,23 @@ int dns_answer_reserve(DnsAnswer **a, unsigned n_free);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
-#define DNS_ANSWER_FOREACH(kk, a) \
- for (unsigned _i = ({ \
+#define _DNS_ANSWER_FOREACH(q, kk, a) \
+ for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
0; \
- }); \
- (a) && ((_i) < (a)->n_rrs); \
- _i++, (kk) = (_i < (a)->n_rrs ? (a)->items[_i].rr : NULL))
+ }); \
+ (a) && (UNIQ_T(i, q) < (a)->n_rrs); \
+ UNIQ_T(i, q)++, (kk) = (UNIQ_T(i, q) < (a)->n_rrs ? (a)->items[UNIQ_T(i, q)].rr : NULL))
-#define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) \
- for (unsigned _i = ({ \
+#define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a)
+
+#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifindex, a) \
+ for (unsigned UNIQ_T(i, q) = ({ \
(kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
(ifindex) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
0; \
- }); \
- (a) && ((_i) < (a)->n_rrs); \
- _i++, (kk) = ((_i < (a)->n_rrs) ? (a)->items[_i].rr : NULL), (ifindex) = ((_i < (a)->n_rrs) ? (a)->items[_i].ifindex : 0))
+ }); \
+ (a) && (UNIQ_T(i, q) < (a)->n_rrs); \
+ UNIQ_T(i, q)++, (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), (ifindex) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0))
+
+#define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a)
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index d963ce6e00..3f34017789 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -521,8 +521,8 @@ fail:
return r;
}
-static DnsCacheItem *dns_cache_get_by_key_follow_cname(DnsCache *c, DnsResourceKey *k) {
- _cleanup_(dns_resource_key_unrefp) DnsResourceKey *cname_key = NULL;
+static DnsCacheItem *dns_cache_get_by_key_follow_cname_dname_nsec(DnsCache *c, DnsResourceKey *k) {
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *nsec_key = NULL, *cname_key = NULL;
DnsCacheItem *i;
const char *n;
int r;
@@ -534,20 +534,29 @@ static DnsCacheItem *dns_cache_get_by_key_follow_cname(DnsCache *c, DnsResourceK
* much, after all this is just a cache */
i = hashmap_get(c->by_key, k);
- if (i || k->type == DNS_TYPE_CNAME || k->type == DNS_TYPE_DNAME)
+ if (i || IN_SET(k->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME, DNS_TYPE_NSEC))
+ return i;
+
+ n = DNS_RESOURCE_KEY_NAME(k);
+
+ /* Check if we have an NSEC record instead for the name. */
+ nsec_key = dns_resource_key_new(k->class, DNS_TYPE_NSEC, n);
+ if (!nsec_key)
+ return NULL;
+
+ i = hashmap_get(c->by_key, nsec_key);
+ if (i)
return i;
/* Check if we have a CNAME record instead */
cname_key = dns_resource_key_new_cname(k);
if (!cname_key)
return NULL;
-
i = hashmap_get(c->by_key, cname_key);
if (i)
return i;
/* OK, let's look for cached DNAME records. */
- n = DNS_RESOURCE_KEY_NAME(k);
for (;;) {
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *dname_key = NULL;
char label[DNS_LABEL_MAX];
@@ -578,6 +587,7 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
int r;
bool nxdomain = false;
_cleanup_free_ char *key_str = NULL;
+ DnsResourceRecord *nsec = NULL;
DnsCacheItem *j, *first;
assert(c);
@@ -601,7 +611,7 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
return 0;
}
- first = dns_cache_get_by_key_follow_cname(c, key);
+ first = dns_cache_get_by_key_follow_cname_dname_nsec(c, key);
if (!first) {
/* If one question cannot be answered we need to refresh */
@@ -617,9 +627,11 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
}
LIST_FOREACH(by_key, j, first) {
- if (j->rr)
+ if (j->rr) {
+ if (j->rr->key->type == DNS_TYPE_NSEC)
+ nsec = j->rr;
n++;
- else if (j->type == DNS_CACHE_NXDOMAIN)
+ } else if (j->type == DNS_CACHE_NXDOMAIN)
nxdomain = true;
}
@@ -627,9 +639,22 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
if (r < 0)
return r;
+ if (nsec && key->type != DNS_TYPE_NSEC) {
+ log_debug("NSEC NODATA cache hit for %s", key_str);
+
+ /* We only found an NSEC record that matches our name.
+ * If it says the type doesn't exit report
+ * NODATA. Otherwise report a cache miss. */
+
+ *ret = NULL;
+ *rcode = DNS_RCODE_SUCCESS;
+
+ return !bitmap_isset(nsec->nsec.types, key->type);
+ }
+
log_debug("%s cache hit for %s",
- nxdomain ? "NXDOMAIN" :
- n > 0 ? "Positive" : "NODATA",
+ n > 0 ? "Positive" :
+ nxdomain ? "NXDOMAIN" : "NODATA",
key_str);
if (n <= 0) {
diff --git a/src/resolve/resolved-dns-cache.h b/src/resolve/resolved-dns-cache.h
index 164435b4fb..561d31ad99 100644
--- a/src/resolve/resolved-dns-cache.h
+++ b/src/resolve/resolved-dns-cache.h
@@ -21,7 +21,6 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-
#include "hashmap.h"
#include "list.h"
#include "prioq.h"
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c
new file mode 100644
index 0000000000..a32e938045
--- /dev/null
+++ b/src/resolve/resolved-dns-dnssec.c
@@ -0,0 +1,692 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <gcrypt.h>
+
+#include "alloc-util.h"
+#include "dns-domain.h"
+#include "resolved-dns-dnssec.h"
+#include "resolved-dns-packet.h"
+
+/* Open question:
+ *
+ * How does the DNSSEC canonical form of a hostname with a label
+ * containing a dot look like, the way DNS-SD does it?
+ *
+ * */
+
+#define VERIFY_RRS_MAX 256
+#define MAX_KEY_SIZE (32*1024)
+
+/*
+ * The DNSSEC Chain of trust:
+ *
+ * Normal RRs are protected via RRSIG RRs in combination with DNSKEY RRs, all in the same zone
+ * DNSKEY RRs are either protected like normal RRs, or via a DS from a zone "higher" up the tree
+ * DS RRs are protected like normal RRs
+ *
+ * Example chain:
+ * Normal RR → RRSIG/DNSKEY+ → DS → RRSIG/DNSKEY+ → DS → ... → DS → RRSIG/DNSKEY+ → DS
+ */
+
+static bool dnssec_algorithm_supported(int algorithm) {
+ return IN_SET(algorithm,
+ DNSSEC_ALGORITHM_RSASHA1,
+ DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1,
+ DNSSEC_ALGORITHM_RSASHA256,
+ DNSSEC_ALGORITHM_RSASHA512);
+}
+
+static bool dnssec_digest_supported(int digest) {
+ return IN_SET(digest,
+ DNSSEC_DIGEST_SHA1,
+ DNSSEC_DIGEST_SHA256);
+}
+
+uint16_t dnssec_keytag(DnsResourceRecord *dnskey) {
+ const uint8_t *p;
+ uint32_t sum;
+ size_t i;
+
+ /* The algorithm from RFC 4034, Appendix B. */
+
+ 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);
+
+ p = dnskey->dnskey.key;
+
+ for (i = 0; i < dnskey->dnskey.key_size; i++)
+ sum += (i & 1) == 0 ? (uint32_t) p[i] << 8 : (uint32_t) p[i];
+
+ sum += (sum >> 16) & UINT32_C(0xFFFF);
+
+ return sum & UINT32_C(0xFFFF);
+}
+
+static int rr_compare(const void *a, const void *b) {
+ DnsResourceRecord **x = (DnsResourceRecord**) a, **y = (DnsResourceRecord**) b;
+ size_t m;
+ int r;
+
+ /* Let's order the RRs according to RFC 4034, Section 6.3 */
+
+ assert(x);
+ assert(*x);
+ assert((*x)->wire_format);
+ assert(y);
+ assert(*y);
+ assert((*y)->wire_format);
+
+ m = MIN((*x)->wire_format_size, (*y)->wire_format_size);
+
+ r = memcmp((*x)->wire_format, (*y)->wire_format, m);
+ if (r != 0)
+ return r;
+
+ if ((*x)->wire_format_size < (*y)->wire_format_size)
+ return -1;
+ else if ((*x)->wire_format_size > (*y)->wire_format_size)
+ return 1;
+
+ return 0;
+}
+
+static int dnssec_rsa_verify(
+ const char *hash_algorithm,
+ const void *signature, size_t signature_size,
+ const void *data, size_t data_size,
+ const void *exponent, size_t exponent_size,
+ const void *modulus, size_t modulus_size) {
+
+ gcry_sexp_t public_key_sexp = NULL, data_sexp = NULL, signature_sexp = NULL;
+ gcry_mpi_t n = NULL, e = NULL, s = NULL;
+ gcry_error_t ge;
+ int r;
+
+ assert(hash_algorithm);
+
+ ge = gcry_mpi_scan(&s, GCRYMPI_FMT_USG, signature, signature_size, NULL);
+ if (ge != 0) {
+ r = -EIO;
+ goto finish;
+ }
+
+ ge = gcry_mpi_scan(&e, GCRYMPI_FMT_USG, exponent, exponent_size, NULL);
+ if (ge != 0) {
+ r = -EIO;
+ goto finish;
+ }
+
+ ge = gcry_mpi_scan(&n, GCRYMPI_FMT_USG, modulus, modulus_size, NULL);
+ if (ge != 0) {
+ r = -EIO;
+ goto finish;
+ }
+
+ ge = gcry_sexp_build(&signature_sexp,
+ NULL,
+ "(sig-val (rsa (s %m)))",
+ s);
+
+ if (ge != 0) {
+ r = -EIO;
+ goto finish;
+ }
+
+ ge = gcry_sexp_build(&data_sexp,
+ NULL,
+ "(data (flags pkcs1) (hash %s %b))",
+ hash_algorithm,
+ (int) data_size,
+ data);
+ if (ge != 0) {
+ r = -EIO;
+ goto finish;
+ }
+
+ ge = gcry_sexp_build(&public_key_sexp,
+ NULL,
+ "(public-key (rsa (n %m) (e %m)))",
+ n,
+ e);
+ if (ge != 0) {
+ r = -EIO;
+ goto finish;
+ }
+
+ ge = gcry_pk_verify(signature_sexp, data_sexp, public_key_sexp);
+ if (ge == GPG_ERR_BAD_SIGNATURE)
+ r = 0;
+ else if (ge != 0)
+ r = -EIO;
+ else
+ r = 1;
+
+finish:
+ if (e)
+ gcry_mpi_release(e);
+ if (n)
+ gcry_mpi_release(n);
+ if (s)
+ gcry_mpi_release(s);
+
+ if (public_key_sexp)
+ gcry_sexp_release(public_key_sexp);
+ if (signature_sexp)
+ gcry_sexp_release(signature_sexp);
+ if (data_sexp)
+ gcry_sexp_release(data_sexp);
+
+ return r;
+}
+
+static void md_add_uint8(gcry_md_hd_t md, uint8_t v) {
+ gcry_md_write(md, &v, sizeof(v));
+}
+
+static void md_add_uint16(gcry_md_hd_t md, uint16_t v) {
+ v = htobe16(v);
+ gcry_md_write(md, &v, sizeof(v));
+}
+
+static void md_add_uint32(gcry_md_hd_t md, uint32_t v) {
+ v = htobe32(v);
+ gcry_md_write(md, &v, sizeof(v));
+}
+
+static int dnssec_rrsig_expired(DnsResourceRecord *rrsig, usec_t realtime) {
+ usec_t expiration, inception, skew;
+
+ assert(rrsig);
+ assert(rrsig->key->type == DNS_TYPE_RRSIG);
+
+ if (realtime == USEC_INFINITY)
+ realtime = now(CLOCK_REALTIME);
+
+ expiration = rrsig->rrsig.expiration * USEC_PER_SEC;
+ inception = rrsig->rrsig.inception * USEC_PER_SEC;
+
+ if (inception > expiration)
+ return -EINVAL;
+
+ /* Permit a certain amount of clock skew of 10% of the valid time range */
+ skew = (expiration - inception) / 10;
+
+ if (inception < skew)
+ inception = 0;
+ else
+ inception -= skew;
+
+ if (expiration + skew < expiration)
+ expiration = USEC_INFINITY;
+ else
+ expiration += skew;
+
+ return realtime < inception || realtime > expiration;
+}
+
+int dnssec_verify_rrset(
+ DnsAnswer *a,
+ DnsResourceKey *key,
+ DnsResourceRecord *rrsig,
+ DnsResourceRecord *dnskey,
+ usec_t realtime) {
+
+ uint8_t wire_format_name[DNS_WIRE_FOMAT_HOSTNAME_MAX];
+ size_t exponent_size, modulus_size, hash_size;
+ void *exponent, *modulus, *hash;
+ DnsResourceRecord **list, *rr;
+ gcry_md_hd_t md = NULL;
+ size_t k, n = 0;
+ int r;
+
+ assert(key);
+ assert(rrsig);
+ assert(dnskey);
+ assert(rrsig->key->type == DNS_TYPE_RRSIG);
+ assert(dnskey->key->type == DNS_TYPE_DNSKEY);
+
+ /* Verifies the the RRSet matching the specified "key" in "a",
+ * using the signature "rrsig" and the key "dnskey". It's
+ * assumed the RRSIG and DNSKEY match. */
+
+ if (!dnssec_algorithm_supported(rrsig->rrsig.algorithm))
+ return -EOPNOTSUPP;
+
+ if (a->n_rrs > VERIFY_RRS_MAX)
+ return -E2BIG;
+
+ r = dnssec_rrsig_expired(rrsig, realtime);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return DNSSEC_SIGNATURE_EXPIRED;
+
+ /* Collect all relevant RRs in a single array, so that we can look at the RRset */
+ list = newa(DnsResourceRecord *, a->n_rrs);
+
+ DNS_ANSWER_FOREACH(rr, a) {
+ r = dns_resource_key_equal(key, rr->key);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ /* We need the wire format for ordering, and digest calculation */
+ r = dns_resource_record_to_wire_format(rr, true);
+ if (r < 0)
+ return r;
+
+ list[n++] = rr;
+ }
+
+ if (n <= 0)
+ return -ENODATA;
+
+ /* Bring the RRs into canonical order */
+ qsort_safe(list, n, sizeof(DnsResourceRecord), rr_compare);
+
+ /* OK, the RRs are now in canonical order. Let's calculate the digest */
+ switch (rrsig->rrsig.algorithm) {
+
+ case DNSSEC_ALGORITHM_RSASHA1:
+ case DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1:
+ gcry_md_open(&md, GCRY_MD_SHA1, 0);
+ hash_size = 20;
+ break;
+
+ case DNSSEC_ALGORITHM_RSASHA256:
+ gcry_md_open(&md, GCRY_MD_SHA256, 0);
+ hash_size = 32;
+ break;
+
+ case DNSSEC_ALGORITHM_RSASHA512:
+ gcry_md_open(&md, GCRY_MD_SHA512, 0);
+ hash_size = 64;
+ break;
+
+ default:
+ assert_not_reached("Unknown digest");
+ }
+
+ if (!md)
+ return -EIO;
+
+ md_add_uint16(md, rrsig->rrsig.type_covered);
+ md_add_uint8(md, rrsig->rrsig.algorithm);
+ md_add_uint8(md, rrsig->rrsig.labels);
+ md_add_uint32(md, rrsig->rrsig.original_ttl);
+ md_add_uint32(md, rrsig->rrsig.expiration);
+ md_add_uint32(md, rrsig->rrsig.inception);
+ md_add_uint16(md, rrsig->rrsig.key_tag);
+
+ r = dns_name_to_wire_format(rrsig->rrsig.signer, wire_format_name, sizeof(wire_format_name), true);
+ if (r < 0)
+ goto finish;
+ gcry_md_write(md, wire_format_name, r);
+
+ for (k = 0; k < n; k++) {
+ size_t l;
+ rr = list[k];
+
+ r = dns_name_to_wire_format(DNS_RESOURCE_KEY_NAME(rr->key), wire_format_name, sizeof(wire_format_name), true);
+ if (r < 0)
+ goto finish;
+ gcry_md_write(md, wire_format_name, r);
+
+ md_add_uint16(md, rr->key->type);
+ 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;
+ 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);
+ }
+
+ hash = gcry_md_read(md, 0);
+ if (!hash) {
+ r = -EIO;
+ goto finish;
+ }
+
+ if (*(uint8_t*) dnskey->dnskey.key == 0) {
+ /* exponent is > 255 bytes long */
+
+ exponent = (uint8_t*) dnskey->dnskey.key + 3;
+ exponent_size =
+ ((size_t) (((uint8_t*) dnskey->dnskey.key)[0]) << 8) |
+ ((size_t) ((uint8_t*) dnskey->dnskey.key)[1]);
+
+ if (exponent_size < 256) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (3 + exponent_size >= dnskey->dnskey.key_size) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ modulus = (uint8_t*) dnskey->dnskey.key + 3 + exponent_size;
+ modulus_size = dnskey->dnskey.key_size - 3 - exponent_size;
+
+ } else {
+ /* exponent is <= 255 bytes long */
+
+ exponent = (uint8_t*) dnskey->dnskey.key + 1;
+ exponent_size = (size_t) ((uint8_t*) dnskey->dnskey.key)[0];
+
+ if (exponent_size <= 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (1 + exponent_size >= dnskey->dnskey.key_size) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ modulus = (uint8_t*) dnskey->dnskey.key + 1 + exponent_size;
+ modulus_size = dnskey->dnskey.key_size - 1 - exponent_size;
+ }
+
+ r = dnssec_rsa_verify(
+ gcry_md_algo_name(gcry_md_get_algo(md)),
+ rrsig->rrsig.signature, rrsig->rrsig.signature_size,
+ hash, hash_size,
+ exponent, exponent_size,
+ modulus, modulus_size);
+ if (r < 0)
+ goto finish;
+
+ r = r ? DNSSEC_VERIFIED : DNSSEC_INVALID;
+
+finish:
+ gcry_md_close(md);
+ return r;
+}
+
+int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey) {
+
+ assert(rrsig);
+ assert(dnskey);
+
+ /* Checks if the specified DNSKEY RR matches the key used for
+ * the signature in the specified RRSIG RR */
+
+ if (rrsig->key->type != DNS_TYPE_RRSIG)
+ return -EINVAL;
+
+ if (dnskey->key->type != DNS_TYPE_DNSKEY)
+ return 0;
+ if (dnskey->key->class != rrsig->key->class)
+ return 0;
+ if ((dnskey->dnskey.flags & DNSKEY_FLAG_ZONE_KEY) == 0)
+ 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)
+ return 0;
+
+ return dns_name_equal(DNS_RESOURCE_KEY_NAME(dnskey->key), DNS_RESOURCE_KEY_NAME(rrsig->key));
+}
+
+int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig) {
+ assert(key);
+ assert(rrsig);
+
+ /* Checks if the specified RRSIG RR protects the RRSet of the specified RR key. */
+
+ if (rrsig->key->type != DNS_TYPE_RRSIG)
+ return 0;
+ if (rrsig->key->class != key->class)
+ return 0;
+ if (rrsig->rrsig.type_covered != key->type)
+ return 0;
+
+ return dns_name_equal(DNS_RESOURCE_KEY_NAME(rrsig->key), DNS_RESOURCE_KEY_NAME(key));
+}
+
+int dnssec_verify_rrset_search(
+ DnsAnswer *a,
+ DnsResourceKey *key,
+ DnsAnswer *validated_dnskeys,
+ usec_t realtime) {
+
+ bool found_rrsig = false, found_dnskey = false;
+ DnsResourceRecord *rrsig;
+ int r;
+
+ assert(key);
+
+ /* Verifies all RRs from "a" that match the key "key", against DNSKEY RRs in "validated_dnskeys" */
+
+ if (!a || a->n_rrs <= 0)
+ return -ENODATA;
+
+ /* Iterate through each RRSIG RR. */
+ DNS_ANSWER_FOREACH(rrsig, a) {
+ DnsResourceRecord *dnskey;
+
+ r = dnssec_key_match_rrsig(key, rrsig);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ found_rrsig = true;
+
+ DNS_ANSWER_FOREACH(dnskey, validated_dnskeys) {
+
+ r = dnssec_rrsig_match_dnskey(rrsig, dnskey);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ continue;
+
+ found_dnskey = true;
+
+ /* Take the time here, if it isn't set yet, so
+ * that we do all validations with the same
+ * time. */
+ if (realtime == USEC_INFINITY)
+ realtime = now(CLOCK_REALTIME);
+
+ /* 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
+ * combination. */
+
+ r = dnssec_verify_rrset(a, key, rrsig, dnskey, realtime);
+ if (r < 0 && r != EOPNOTSUPP)
+ return r;
+ if (r == DNSSEC_VERIFIED)
+ return DNSSEC_VERIFIED;
+
+ /* If the signature is invalid, or done using
+ an unsupported algorithm, let's try another
+ key and/or signature. After all they
+ key_tags and stuff are not unique, and
+ might be shared by multiple keys. */
+ }
+ }
+
+ if (found_dnskey)
+ return DNSSEC_INVALID;
+
+ if (found_rrsig)
+ return DNSSEC_MISSING_KEY;
+
+ return DNSSEC_NO_SIGNATURE;
+}
+
+int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max) {
+ _cleanup_free_ char *s = NULL;
+ size_t c = 0;
+ int r;
+
+ /* Converts the specified hostname into DNSSEC canonicalized
+ * form. */
+
+ if (buffer_max < 2)
+ return -ENOBUFS;
+
+ for (;;) {
+ size_t i;
+
+ r = dns_label_unescape(&n, buffer, buffer_max);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+ if (r > 0) {
+ int k;
+
+ /* DNSSEC validation is always done on the ASCII version of the label */
+ k = dns_label_apply_idna(buffer, r, buffer, buffer_max);
+ if (k < 0)
+ return k;
+ if (k > 0)
+ r = k;
+ }
+
+ if (buffer_max < (size_t) r + 2)
+ return -ENOBUFS;
+
+ /* The DNSSEC canonical form is not clear on what to
+ * do with dots appearing in labels, the way DNS-SD
+ * does it. Refuse it for now. */
+
+ if (memchr(buffer, '.', r))
+ return -EINVAL;
+
+ for (i = 0; i < (size_t) r; i ++) {
+ if (buffer[i] >= 'A' && buffer[i] <= 'Z')
+ buffer[i] = buffer[i] - 'A' + 'a';
+ }
+
+ buffer[r] = '.';
+
+ buffer += r + 1;
+ c += r + 1;
+
+ buffer_max -= r + 1;
+ }
+
+ if (c <= 0) {
+ /* Not even a single label: this is the root domain name */
+
+ assert(buffer_max > 2);
+ buffer[0] = '.';
+ buffer[1] = 0;
+
+ return 1;
+ }
+
+ return (int) c;
+}
+
+int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds) {
+ gcry_md_hd_t md = NULL;
+ char owner_name[DNSSEC_CANONICAL_HOSTNAME_MAX];
+ void *result;
+ int r;
+
+ assert(dnskey);
+ assert(ds);
+
+ /* Implements DNSKEY verification by a DS, according to RFC 4035, section 5.2 */
+
+ if (dnskey->key->type != DNS_TYPE_DNSKEY)
+ return -EINVAL;
+ if (ds->key->type != DNS_TYPE_DS)
+ return -EINVAL;
+ if ((dnskey->dnskey.flags & DNSKEY_FLAG_ZONE_KEY) == 0)
+ return -EKEYREJECTED;
+ if (dnskey->dnskey.protocol != 3)
+ return -EKEYREJECTED;
+
+ if (!dnssec_algorithm_supported(dnskey->dnskey.algorithm))
+ return -EOPNOTSUPP;
+ if (!dnssec_digest_supported(ds->ds.digest_type))
+ return -EOPNOTSUPP;
+
+ if (dnskey->dnskey.algorithm != ds->ds.algorithm)
+ return 0;
+ if (dnssec_keytag(dnskey) != ds->ds.key_tag)
+ return 0;
+
+ switch (ds->ds.digest_type) {
+
+ case DNSSEC_DIGEST_SHA1:
+
+ if (ds->ds.digest_size != 20)
+ return 0;
+
+ gcry_md_open(&md, GCRY_MD_SHA1, 0);
+ break;
+
+ case DNSSEC_DIGEST_SHA256:
+
+ if (ds->ds.digest_size != 32)
+ return 0;
+
+ gcry_md_open(&md, GCRY_MD_SHA256, 0);
+ break;
+
+ default:
+ assert_not_reached("Unknown digest");
+ }
+
+ if (!md)
+ return -EIO;
+
+ r = dnssec_canonicalize(DNS_RESOURCE_KEY_NAME(dnskey->key), owner_name, sizeof(owner_name));
+ if (r < 0)
+ goto finish;
+
+ gcry_md_write(md, owner_name, r);
+ 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);
+
+ result = gcry_md_read(md, 0);
+ if (!result) {
+ r = -EIO;
+ goto finish;
+ }
+
+ r = memcmp(result, ds->ds.digest, ds->ds.digest_size) != 0;
+
+finish:
+ gcry_md_close(md);
+ return r;
+}
diff --git a/src/resolve/resolved-dns-dnssec.h b/src/resolve/resolved-dns-dnssec.h
new file mode 100644
index 0000000000..8f812bc1fb
--- /dev/null
+++ b/src/resolve/resolved-dns-dnssec.h
@@ -0,0 +1,49 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "dns-domain.h"
+#include "resolved-dns-answer.h"
+#include "resolved-dns-rr.h"
+
+enum {
+ DNSSEC_VERIFIED,
+ DNSSEC_INVALID,
+ DNSSEC_NO_SIGNATURE,
+ DNSSEC_MISSING_KEY,
+ DNSSEC_SIGNATURE_EXPIRED,
+};
+
+
+#define DNSSEC_CANONICAL_HOSTNAME_MAX (DNS_HOSTNAME_MAX + 2)
+
+int dnssec_rrsig_match_dnskey(DnsResourceRecord *rrsig, DnsResourceRecord *dnskey);
+int dnssec_key_match_rrsig(DnsResourceKey *key, DnsResourceRecord *rrsig);
+
+int dnssec_verify_rrset(DnsAnswer *answer, DnsResourceKey *key, DnsResourceRecord *rrsig, DnsResourceRecord *dnskey, usec_t realtime);
+int dnssec_verify_rrset_search(DnsAnswer *a, DnsResourceKey *key, DnsAnswer *validated_dnskeys, usec_t realtime);
+
+int dnssec_verify_dnskey(DnsResourceRecord *dnskey, DnsResourceRecord *ds);
+
+uint16_t dnssec_keytag(DnsResourceRecord *dnskey);
+
+int dnssec_canonicalize(const char *n, char *buffer, size_t buffer_max);
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 75ca23fd08..2a010ef507 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -108,6 +108,8 @@ DnsPacket *dns_packet_ref(DnsPacket *p) {
if (!p)
return NULL;
+ assert(!p->on_stack);
+
assert(p->n_ref > 0);
p->n_ref++;
return p;
@@ -126,7 +128,9 @@ static void dns_packet_free(DnsPacket *p) {
hashmap_free(p->names);
free(p->_data);
- free(p);
+
+ if (!p->on_stack)
+ free(p);
}
DnsPacket *dns_packet_unref(DnsPacket *p) {
@@ -351,25 +355,10 @@ int dns_packet_append_uint32(DnsPacket *p, uint32_t v, size_t *start) {
}
int dns_packet_append_string(DnsPacket *p, const char *s, size_t *start) {
- void *d;
- size_t l;
- int r;
-
assert(p);
assert(s);
- l = strlen(s);
- if (l > 255)
- return -E2BIG;
-
- r = dns_packet_extend(p, 1 + l, &d, start);
- if (r < 0)
- return r;
-
- ((uint8_t*) d)[0] = (uint8_t) l;
- memcpy(((uint8_t*) d) + 1, s, l);
-
- return 0;
+ return dns_packet_append_raw_string(p, s, strlen(s), start);
}
int dns_packet_append_raw_string(DnsPacket *p, const void *s, size_t size, size_t *start) {
@@ -395,7 +384,7 @@ int dns_packet_append_raw_string(DnsPacket *p, const void *s, size_t size, size_
}
int dns_packet_append_label(DnsPacket *p, const char *d, size_t l, size_t *start) {
- void *w;
+ uint8_t *w;
int r;
assert(p);
@@ -404,12 +393,29 @@ int dns_packet_append_label(DnsPacket *p, const char *d, size_t l, size_t *start
if (l > DNS_LABEL_MAX)
return -E2BIG;
- r = dns_packet_extend(p, 1 + l, &w, start);
+ r = dns_packet_extend(p, 1 + l, (void**) &w, start);
if (r < 0)
return r;
- ((uint8_t*) w)[0] = (uint8_t) l;
- memcpy(((uint8_t*) w) + 1, d, l);
+ *(w++) = (uint8_t) l;
+
+ if (p->canonical_form) {
+ size_t i;
+
+ /* Generate in canonical form, as defined by DNSSEC
+ * RFC 4034, Section 6.2, i.e. all lower-case. */
+
+ for (i = 0; i < l; i++) {
+ if (d[i] >= 'A' && d[i] <= 'Z')
+ w[i] = (uint8_t) (d[i] - 'A' + 'a');
+ else
+ w[i] = (uint8_t) d[i];
+ }
+ } else
+ /* Otherwise, just copy the string unaltered. This is
+ * essential for DNS-SD, where the casing of labels
+ * matters and needs to be retained. */
+ memcpy(w, d, l);
return 0;
}
@@ -662,8 +668,8 @@ fail:
return r;
}
-int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start) {
- size_t saved_size, rdlength_offset, end, rdlength;
+int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start, size_t *rdata_start) {
+ size_t saved_size, rdlength_offset, end, rdlength, rds;
int r;
assert(p);
@@ -684,6 +690,8 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
if (r < 0)
goto fail;
+ rds = p->size - saved_size;
+
switch (rr->unparseable ? _DNS_TYPE_INVALID : rr->key->type) {
case DNS_TYPE_SRV:
@@ -841,11 +849,11 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
break;
case DNS_TYPE_DNSKEY:
- r = dns_packet_append_uint16(p, dnskey_to_flags(rr), NULL);
+ r = dns_packet_append_uint16(p, rr->dnskey.flags, NULL);
if (r < 0)
goto fail;
- r = dns_packet_append_uint8(p, 3u, NULL);
+ r = dns_packet_append_uint8(p, rr->dnskey.protocol, NULL);
if (r < 0)
goto fail;
@@ -962,6 +970,9 @@ int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *star
if (start)
*start = saved_size;
+ if (rdata_start)
+ *rdata_start = rds;
+
return 0;
fail:
@@ -1427,17 +1438,6 @@ static bool loc_size_ok(uint8_t size) {
return m <= 9 && e <= 9 && (m > 0 || e == 0);
}
-static int dnskey_parse_flags(DnsResourceRecord *rr, uint16_t flags) {
- assert(rr);
-
- if (flags & ~(DNSKEY_FLAG_SEP | DNSKEY_FLAG_ZONE_KEY))
- return -EBADMSG;
-
- rr->dnskey.zone_key_flag = flags & DNSKEY_FLAG_ZONE_KEY;
- rr->dnskey.sep_flag = flags & DNSKEY_FLAG_SEP;
- return 0;
-}
-
int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
_cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
@@ -1706,28 +1706,15 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
break;
- case DNS_TYPE_DNSKEY: {
- uint16_t flags;
- uint8_t proto;
-
- r = dns_packet_read_uint16(p, &flags, NULL);
- if (r < 0)
- goto fail;
-
- r = dnskey_parse_flags(rr, flags);
+ case DNS_TYPE_DNSKEY:
+ r = dns_packet_read_uint16(p, &rr->dnskey.flags, NULL);
if (r < 0)
goto fail;
- r = dns_packet_read_uint8(p, &proto, NULL);
+ r = dns_packet_read_uint8(p, &rr->dnskey.protocol, NULL);
if (r < 0)
goto fail;
- /* protocol is required to be always 3 */
- if (proto != 3) {
- r = -EBADMSG;
- goto fail;
- }
-
r = dns_packet_read_uint8(p, &rr->dnskey.algorithm, NULL);
if (r < 0)
goto fail;
@@ -1744,7 +1731,6 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, size_t *start) {
}
break;
- }
case DNS_TYPE_RRSIG:
r = dns_packet_read_uint16(p, &rr->rrsig.type_covered, NULL);
@@ -1976,17 +1962,3 @@ static const char* const dns_protocol_table[_DNS_PROTOCOL_MAX] = {
[DNS_PROTOCOL_LLMNR] = "llmnr",
};
DEFINE_STRING_TABLE_LOOKUP(dns_protocol, DnsProtocol);
-
-static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = {
- [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
- [DNSSEC_ALGORITHM_DH] = "DH",
- [DNSSEC_ALGORITHM_DSA] = "DSA",
- [DNSSEC_ALGORITHM_ECC] = "ECC",
- [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
- [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1",
- [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1",
- [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
- [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
- [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
-};
-DEFINE_STRING_TABLE_LOOKUP(dnssec_algorithm, int);
diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
index 25dfb2642f..a6b88e6c79 100644
--- a/src/resolve/resolved-dns-packet.h
+++ b/src/resolve/resolved-dns-packet.h
@@ -88,8 +88,10 @@ struct DnsPacket {
uint16_t sender_port, destination_port;
uint32_t ttl;
- bool extracted;
- bool refuse_compression;
+ bool on_stack:1;
+ bool extracted:1;
+ bool refuse_compression:1;
+ bool canonical_form:1;
};
static inline uint8_t* DNS_PACKET_DATA(DnsPacket *p) {
@@ -162,7 +164,7 @@ int dns_packet_append_raw_string(DnsPacket *p, const void *s, size_t size, size_
int dns_packet_append_label(DnsPacket *p, const char *s, size_t l, size_t *start);
int dns_packet_append_name(DnsPacket *p, const char *name, bool allow_compression, size_t *start);
int dns_packet_append_key(DnsPacket *p, const DnsResourceKey *key, size_t *start);
-int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start);
+int dns_packet_append_rr(DnsPacket *p, const DnsResourceRecord *rr, size_t *start, size_t *rdata_start);
int dns_packet_append_opt_rr(DnsPacket *p, uint16_t max_udp_size, bool edns0_do, size_t *start);
void dns_packet_truncate(DnsPacket *p, size_t sz);
@@ -223,32 +225,6 @@ DnsProtocol dns_protocol_from_string(const char *s) _pure_;
#define LLMNR_MULTICAST_IPV4_ADDRESS ((struct in_addr) { .s_addr = htobe32(224U << 24 | 252U) })
#define LLMNR_MULTICAST_IPV6_ADDRESS ((struct in6_addr) { .s6_addr = { 0xFF, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x03 } })
-#define DNSKEY_FLAG_ZONE_KEY (1u << 8)
-#define DNSKEY_FLAG_SEP (1u << 0)
-
-static inline uint16_t dnskey_to_flags(const DnsResourceRecord *rr) {
- return (rr->dnskey.zone_key_flag * DNSKEY_FLAG_ZONE_KEY |
- rr->dnskey.sep_flag * DNSKEY_FLAG_SEP);
-}
-
-/* http://tools.ietf.org/html/rfc4034#appendix-A.1 */
-enum {
- DNSSEC_ALGORITHM_RSAMD5 = 1,
- DNSSEC_ALGORITHM_DH,
- DNSSEC_ALGORITHM_DSA,
- DNSSEC_ALGORITHM_ECC,
- DNSSEC_ALGORITHM_RSASHA1,
- DNSSEC_ALGORITHM_DSA_NSEC3_SHA1,
- DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1,
- DNSSEC_ALGORITHM_INDIRECT = 252,
- DNSSEC_ALGORITHM_PRIVATEDNS,
- DNSSEC_ALGORITHM_PRIVATEOID,
- _DNSSEC_ALGORITHM_MAX_DEFINED
-};
-
-const char* dnssec_algorithm_to_string(int i) _const_;
-int dnssec_algorithm_from_string(const char *s) _pure_;
-
static inline uint64_t SD_RESOLVED_FLAGS_MAKE(DnsProtocol protocol, int family) {
/* Converts a protocol + family into a flags field as used in queries */
diff --git a/src/resolve/resolved-dns-question.h b/src/resolve/resolved-dns-question.h
index e77116c03a..5ffb63e250 100644
--- a/src/resolve/resolved-dns-question.h
+++ b/src/resolve/resolved-dns-question.h
@@ -23,9 +23,10 @@
typedef struct DnsQuestion DnsQuestion;
+#include "macro.h"
#include "resolved-dns-rr.h"
-/* A simple array of resources keys */
+/* A simple array of resource keys */
struct DnsQuestion {
unsigned n_ref;
@@ -55,10 +56,12 @@ const char *dns_question_first_name(DnsQuestion *q);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuestion*, dns_question_unref);
-#define DNS_QUESTION_FOREACH(key, q) \
- for (unsigned _i = ({ \
+#define _DNS_QUESTION_FOREACH(u, key, q) \
+ for (unsigned UNIQ_T(i, u) = ({ \
(key) = ((q) && (q)->n_keys > 0) ? (q)->keys[0] : NULL; \
0; \
}); \
- (q) && ((_i) < (q)->n_keys); \
- _i++, (key) = (_i < (q)->n_keys ? (q)->keys[_i] : NULL))
+ (q) && (UNIQ_T(i, u) < (q)->n_keys); \
+ UNIQ_T(i, u)++, (key) = (UNIQ_T(i, u) < (q)->n_keys ? (q)->keys[UNIQ_T(i, u)] : NULL))
+
+#define DNS_QUESTION_FOREACH(key, q) _DNS_QUESTION_FOREACH(UNIQ, key, q)
diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index 4a1abb0cdc..281e228b12 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -27,6 +27,7 @@
#include "hexdecoct.h"
#include "resolved-dns-packet.h"
#include "resolved-dns-rr.h"
+#include "string-table.h"
#include "string-util.h"
#include "strv.h"
@@ -416,6 +417,7 @@ DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
free(rr->generic.data);
}
+ free(rr->wire_format);
dns_resource_key_unref(rr->key);
}
@@ -576,8 +578,8 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
memcmp(a->sshfp.fingerprint, b->sshfp.fingerprint, a->sshfp.fingerprint_size) == 0;
case DNS_TYPE_DNSKEY:
- return a->dnskey.zone_key_flag == b->dnskey.zone_key_flag &&
- a->dnskey.sep_flag == b->dnskey.sep_flag &&
+ return a->dnskey.flags == b->dnskey.flags &&
+ a->dnskey.protocol == b->dnskey.protocol &&
a->dnskey.algorithm == b->dnskey.algorithm &&
a->dnskey.key_size == b->dnskey.key_size &&
memcmp(a->dnskey.key, b->dnskey.key, a->dnskey.key_size) == 0;
@@ -883,9 +885,10 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
if (!t)
return -ENOMEM;
- r = asprintf(&s, "%s %u 3 %.*s%.*u %s",
+ r = asprintf(&s, "%s %u %u %.*s%.*u %s",
k,
- dnskey_to_flags(rr),
+ rr->dnskey.flags,
+ rr->dnskey.protocol,
alg ? -1 : 0, alg,
alg ? 0 : 1, alg ? 0u : (unsigned) rr->dnskey.algorithm,
t);
@@ -993,6 +996,51 @@ int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret) {
return 0;
}
+int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical) {
+
+ DnsPacket packet = {
+ .n_ref = 1,
+ .protocol = DNS_PROTOCOL_DNS,
+ .on_stack = true,
+ .refuse_compression = true,
+ .canonical_form = canonical,
+ };
+
+ size_t start, rds;
+ int r;
+
+ assert(rr);
+
+ /* Generates the RR in wire-format, optionally in the
+ * canonical form as discussed in the DNSSEC RFC 4034, Section
+ * 6.2. We allocate a throw-away DnsPacket object on the stack
+ * here, because we need some book-keeping for memory
+ * management, and can reuse the DnsPacket serializer, that
+ * can generate the canonical form, too, but also knows label
+ * compression and suchlike. */
+
+ if (rr->wire_format && rr->wire_format_canonical == canonical)
+ return 0;
+
+ r = dns_packet_append_rr(&packet, rr, &start, &rds);
+ if (r < 0)
+ return r;
+
+ assert(start == 0);
+ assert(packet._data);
+
+ free(rr->wire_format);
+ rr->wire_format = packet._data;
+ rr->wire_format_size = packet.size;
+ rr->wire_format_rdata_offset = rds;
+ rr->wire_format_canonical = canonical;
+
+ packet._data = NULL;
+ dns_packet_unref(&packet);
+
+ return 0;
+}
+
const char *dns_class_to_string(uint16_t class) {
switch (class) {
@@ -1049,3 +1097,25 @@ bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b) {
return dns_txt_item_equal(a->items_next, b->items_next);
}
+
+static const char* const dnssec_algorithm_table[_DNSSEC_ALGORITHM_MAX_DEFINED] = {
+ [DNSSEC_ALGORITHM_RSAMD5] = "RSAMD5",
+ [DNSSEC_ALGORITHM_DH] = "DH",
+ [DNSSEC_ALGORITHM_DSA] = "DSA",
+ [DNSSEC_ALGORITHM_ECC] = "ECC",
+ [DNSSEC_ALGORITHM_RSASHA1] = "RSASHA1",
+ [DNSSEC_ALGORITHM_DSA_NSEC3_SHA1] = "DSA-NSEC3-SHA1",
+ [DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1] = "RSASHA1-NSEC3-SHA1",
+ [DNSSEC_ALGORITHM_RSASHA256] = "RSASHA256",
+ [DNSSEC_ALGORITHM_RSASHA512] = "RSASHA512",
+ [DNSSEC_ALGORITHM_INDIRECT] = "INDIRECT",
+ [DNSSEC_ALGORITHM_PRIVATEDNS] = "PRIVATEDNS",
+ [DNSSEC_ALGORITHM_PRIVATEOID] = "PRIVATEOID",
+};
+DEFINE_STRING_TABLE_LOOKUP(dnssec_algorithm, int);
+
+static const char* const dnssec_digest_table[_DNSSEC_DIGEST_MAX_DEFINED] = {
+ [DNSSEC_DIGEST_SHA1] = "SHA1",
+ [DNSSEC_DIGEST_SHA256] = "SHA256",
+};
+DEFINE_STRING_TABLE_LOOKUP(dnssec_digest, int);
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index a092961823..2a103aab8d 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -41,6 +41,37 @@ enum {
_DNS_CLASS_INVALID = -1
};
+/* DNSKEY RR flags */
+#define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8)
+#define DNSKEY_FLAG_SEP (UINT16_C(1) << 0)
+
+/* DNSSEC algorithm identifiers, see
+ * http://tools.ietf.org/html/rfc4034#appendix-A.1 and
+ * https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */
+enum {
+ DNSSEC_ALGORITHM_RSAMD5 = 1,
+ DNSSEC_ALGORITHM_DH,
+ DNSSEC_ALGORITHM_DSA,
+ DNSSEC_ALGORITHM_ECC,
+ DNSSEC_ALGORITHM_RSASHA1,
+ DNSSEC_ALGORITHM_DSA_NSEC3_SHA1,
+ DNSSEC_ALGORITHM_RSASHA1_NSEC3_SHA1,
+ DNSSEC_ALGORITHM_RSASHA256 = 8, /* RFC 5702 */
+ DNSSEC_ALGORITHM_RSASHA512 = 10, /* RFC 5702 */
+ DNSSEC_ALGORITHM_INDIRECT = 252,
+ DNSSEC_ALGORITHM_PRIVATEDNS,
+ DNSSEC_ALGORITHM_PRIVATEOID,
+ _DNSSEC_ALGORITHM_MAX_DEFINED
+};
+
+/* DNSSEC digest identifiers, see
+ * https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml */
+enum {
+ DNSSEC_DIGEST_SHA1 = 1,
+ DNSSEC_DIGEST_SHA256 = 2,
+ _DNSSEC_DIGEST_MAX_DEFINED
+};
+
struct DnsResourceKey {
unsigned n_ref;
uint16_t class, type;
@@ -57,7 +88,11 @@ struct DnsResourceRecord {
unsigned n_ref;
DnsResourceKey *key;
uint32_t ttl;
- bool unparseable;
+ bool unparseable:1;
+ bool wire_format_canonical:1;
+ void *wire_format;
+ size_t wire_format_size;
+ size_t wire_format_rdata_offset;
union {
struct {
void *data;
@@ -135,8 +170,8 @@ struct DnsResourceRecord {
/* http://tools.ietf.org/html/rfc4034#section-2.1 */
struct {
- bool zone_key_flag:1;
- bool sep_flag:1;
+ uint16_t flags;
+ uint8_t protocol;
uint8_t algorithm;
void* key;
size_t key_size;
@@ -209,6 +244,8 @@ int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecor
int dns_resource_record_to_string(const DnsResourceRecord *rr, char **ret);
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsResourceRecord*, dns_resource_record_unref);
+int dns_resource_record_to_wire_format(DnsResourceRecord *rr, bool canonical);
+
DnsTxtItem *dns_txt_item_free_all(DnsTxtItem *i);
bool dns_txt_item_equal(DnsTxtItem *a, DnsTxtItem *b);
@@ -216,3 +253,9 @@ const char *dns_class_to_string(uint16_t type);
int dns_class_from_string(const char *name, uint16_t *class);
extern const struct hash_ops dns_resource_key_hash_ops;
+
+const char* dnssec_algorithm_to_string(int i) _const_;
+int dnssec_algorithm_from_string(const char *s) _pure_;
+
+const char *dnssec_digest_to_string(int i) _const_;
+int dnssec_digest_from_string(const char *s) _pure_;
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 09e6872d26..846280e8b8 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -549,7 +549,7 @@ static int dns_scope_make_reply_packet(
if (answer) {
for (i = 0; i < answer->n_rrs; i++) {
- r = dns_packet_append_rr(p, answer->items[i].rr, NULL);
+ r = dns_packet_append_rr(p, answer->items[i].rr, NULL, NULL);
if (r < 0)
return r;
}
@@ -559,7 +559,7 @@ static int dns_scope_make_reply_packet(
if (soa) {
for (i = 0; i < soa->n_rrs; i++) {
- r = dns_packet_append_rr(p, soa->items[i].rr, NULL);
+ r = dns_packet_append_rr(p, soa->items[i].rr, NULL, NULL);
if (r < 0)
return r;
}
@@ -733,7 +733,7 @@ static int dns_scope_make_conflict_packet(
if (r < 0)
return r;
- r = dns_packet_append_rr(p, rr, NULL);
+ r = dns_packet_append_rr(p, rr, NULL, NULL);
if (r < 0)
return r;
diff --git a/src/resolve/test-dnssec.c b/src/resolve/test-dnssec.c
new file mode 100644
index 0000000000..0b2ffeeddd
--- /dev/null
+++ b/src/resolve/test-dnssec.c
@@ -0,0 +1,217 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+#include "alloc-util.h"
+#include "resolved-dns-dnssec.h"
+#include "resolved-dns-rr.h"
+#include "string-util.h"
+
+static void test_dnssec_verify_rrset(void) {
+
+ static const uint8_t signature_blob[] = {
+ 0x7f, 0x79, 0xdd, 0x5e, 0x89, 0x79, 0x18, 0xd0, 0x34, 0x86, 0x8c, 0x72, 0x77, 0x75, 0x48, 0x4d,
+ 0xc3, 0x7d, 0x38, 0x04, 0xab, 0xcd, 0x9e, 0x4c, 0x82, 0xb0, 0x92, 0xca, 0xe9, 0x66, 0xe9, 0x6e,
+ 0x47, 0xc7, 0x68, 0x8c, 0x94, 0xf6, 0x69, 0xcb, 0x75, 0x94, 0xe6, 0x30, 0xa6, 0xfb, 0x68, 0x64,
+ 0x96, 0x1a, 0x84, 0xe1, 0xdc, 0x16, 0x4c, 0x83, 0x6c, 0x44, 0xf2, 0x74, 0x4d, 0x74, 0x79, 0x8f,
+ 0xf3, 0xf4, 0x63, 0x0d, 0xef, 0x5a, 0xe7, 0xe2, 0xfd, 0xf2, 0x2b, 0x38, 0x7c, 0x28, 0x96, 0x9d,
+ 0xb6, 0xcd, 0x5c, 0x3b, 0x57, 0xe2, 0x24, 0x78, 0x65, 0xd0, 0x9e, 0x77, 0x83, 0x09, 0x6c, 0xff,
+ 0x3d, 0x52, 0x3f, 0x6e, 0xd1, 0xed, 0x2e, 0xf9, 0xee, 0x8e, 0xa6, 0xbe, 0x9a, 0xa8, 0x87, 0x76,
+ 0xd8, 0x77, 0xcc, 0x96, 0xa0, 0x98, 0xa1, 0xd1, 0x68, 0x09, 0x43, 0xcf, 0x56, 0xd9, 0xd1, 0x66,
+ };
+
+ static const uint8_t dnskey_blob[] = {
+ 0x03, 0x01, 0x00, 0x01, 0x9b, 0x49, 0x9b, 0xc1, 0xf9, 0x9a, 0xe0, 0x4e, 0xcf, 0xcb, 0x14, 0x45,
+ 0x2e, 0xc9, 0xf9, 0x74, 0xa7, 0x18, 0xb5, 0xf3, 0xde, 0x39, 0x49, 0xdf, 0x63, 0x33, 0x97, 0x52,
+ 0xe0, 0x8e, 0xac, 0x50, 0x30, 0x8e, 0x09, 0xd5, 0x24, 0x3d, 0x26, 0xa4, 0x49, 0x37, 0x2b, 0xb0,
+ 0x6b, 0x1b, 0xdf, 0xde, 0x85, 0x83, 0xcb, 0x22, 0x4e, 0x60, 0x0a, 0x91, 0x1a, 0x1f, 0xc5, 0x40,
+ 0xb1, 0xc3, 0x15, 0xc1, 0x54, 0x77, 0x86, 0x65, 0x53, 0xec, 0x10, 0x90, 0x0c, 0x91, 0x00, 0x5e,
+ 0x15, 0xdc, 0x08, 0x02, 0x4c, 0x8c, 0x0d, 0xc0, 0xac, 0x6e, 0xc4, 0x3e, 0x1b, 0x80, 0x19, 0xe4,
+ 0xf7, 0x5f, 0x77, 0x51, 0x06, 0x87, 0x61, 0xde, 0xa2, 0x18, 0x0f, 0x40, 0x8b, 0x79, 0x72, 0xfa,
+ 0x8d, 0x1a, 0x44, 0x47, 0x0d, 0x8e, 0x3a, 0x2d, 0xc7, 0x39, 0xbf, 0x56, 0x28, 0x97, 0xd9, 0x20,
+ 0x4f, 0x00, 0x51, 0x3b,
+ };
+
+ _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *a = NULL, *rrsig = NULL, *dnskey = NULL;
+ _cleanup_(dns_answer_unrefp) DnsAnswer *answer = NULL;
+ _cleanup_free_ char *x = NULL, *y = NULL, *z = NULL;
+
+ a = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_A, "nAsA.gov");
+ assert_se(a);
+
+ a->a.in_addr.s_addr = inet_addr("52.0.14.116");
+
+ assert_se(dns_resource_record_to_string(a, &x) >= 0);
+ log_info("A: %s", x);
+
+ rrsig = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_RRSIG, "NaSa.GOV.");
+ assert_se(rrsig);
+
+ rrsig->rrsig.type_covered = DNS_TYPE_A;
+ rrsig->rrsig.algorithm = DNSSEC_ALGORITHM_RSASHA256;
+ rrsig->rrsig.labels = 2;
+ rrsig->rrsig.original_ttl = 600;
+ rrsig->rrsig.expiration = 0x5683135c;
+ rrsig->rrsig.inception = 0x565b7da8;
+ rrsig->rrsig.key_tag = 63876;
+ rrsig->rrsig.signer = strdup("Nasa.Gov.");
+ assert_se(rrsig->rrsig.signer);
+ rrsig->rrsig.signature_size = sizeof(signature_blob);
+ rrsig->rrsig.signature = memdup(signature_blob, rrsig->rrsig.signature_size);
+ assert_se(rrsig->rrsig.signature);
+
+ assert_se(dns_resource_record_to_string(rrsig, &y) >= 0);
+ log_info("RRSIG: %s", y);
+
+ dnskey = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DNSKEY, "nASA.gOV");
+ assert_se(dnskey);
+
+ dnskey->dnskey.flags = 256;
+ dnskey->dnskey.protocol = 3;
+ dnskey->dnskey.algorithm = DNSSEC_ALGORITHM_RSASHA256;
+ dnskey->dnskey.key_size = sizeof(dnskey_blob);
+ dnskey->dnskey.key = memdup(dnskey_blob, sizeof(dnskey_blob));
+ assert_se(dnskey->dnskey.key);
+
+ assert_se(dns_resource_record_to_string(dnskey, &z) >= 0);
+ log_info("DNSKEY: %s", z);
+ log_info("DNSKEY keytag: %u", dnssec_keytag(dnskey));
+
+ assert_se(dnssec_key_match_rrsig(a->key, rrsig) > 0);
+ assert_se(dnssec_rrsig_match_dnskey(rrsig, dnskey) > 0);
+
+ answer = dns_answer_new(1);
+ assert_se(answer);
+ assert_se(dns_answer_add(answer, a, 0) >= 0);
+
+ /* Validate the RR as it if was 2015-12-2 today */
+ assert_se(dnssec_verify_rrset(answer, a->key, rrsig, dnskey, 1449092754*USEC_PER_SEC) == DNSSEC_VERIFIED);
+}
+
+static void test_dnssec_verify_dns_key(void) {
+
+ static const uint8_t ds1_fprint[] = {
+ 0x46, 0x8B, 0xC8, 0xDD, 0xC7, 0xE8, 0x27, 0x03, 0x40, 0xBB, 0x8A, 0x1F, 0x3B, 0x2E, 0x45, 0x9D,
+ 0x80, 0x67, 0x14, 0x01,
+ };
+ static const uint8_t ds2_fprint[] = {
+ 0x8A, 0xEE, 0x80, 0x47, 0x05, 0x5F, 0x83, 0xD1, 0x48, 0xBA, 0x8F, 0xF6, 0xDD, 0xA7, 0x60, 0xCE,
+ 0x94, 0xF7, 0xC7, 0x5E, 0x52, 0x4C, 0xF2, 0xE9, 0x50, 0xB9, 0x2E, 0xCB, 0xEF, 0x96, 0xB9, 0x98,
+ };
+ static const uint8_t dnskey_blob[] = {
+ 0x03, 0x01, 0x00, 0x01, 0xa8, 0x12, 0xda, 0x4f, 0xd2, 0x7d, 0x54, 0x14, 0x0e, 0xcc, 0x5b, 0x5e,
+ 0x45, 0x9c, 0x96, 0x98, 0xc0, 0xc0, 0x85, 0x81, 0xb1, 0x47, 0x8c, 0x7d, 0xe8, 0x39, 0x50, 0xcc,
+ 0xc5, 0xd0, 0xf2, 0x00, 0x81, 0x67, 0x79, 0xf6, 0xcc, 0x9d, 0xad, 0x6c, 0xbb, 0x7b, 0x6f, 0x48,
+ 0x97, 0x15, 0x1c, 0xfd, 0x0b, 0xfe, 0xd3, 0xd7, 0x7d, 0x9f, 0x81, 0x26, 0xd3, 0xc5, 0x65, 0x49,
+ 0xcf, 0x46, 0x62, 0xb0, 0x55, 0x6e, 0x47, 0xc7, 0x30, 0xef, 0x51, 0xfb, 0x3e, 0xc6, 0xef, 0xde,
+ 0x27, 0x3f, 0xfa, 0x57, 0x2d, 0xa7, 0x1d, 0x80, 0x46, 0x9a, 0x5f, 0x14, 0xb3, 0xb0, 0x2c, 0xbe,
+ 0x72, 0xca, 0xdf, 0xb2, 0xff, 0x36, 0x5b, 0x4f, 0xec, 0x58, 0x8e, 0x8d, 0x01, 0xe9, 0xa9, 0xdf,
+ 0xb5, 0x60, 0xad, 0x52, 0x4d, 0xfc, 0xa9, 0x3e, 0x8d, 0x35, 0x95, 0xb3, 0x4e, 0x0f, 0xca, 0x45,
+ 0x1b, 0xf7, 0xef, 0x3a, 0x88, 0x25, 0x08, 0xc7, 0x4e, 0x06, 0xc1, 0x62, 0x1a, 0xce, 0xd8, 0x77,
+ 0xbd, 0x02, 0x65, 0xf8, 0x49, 0xfb, 0xce, 0xf6, 0xa8, 0x09, 0xfc, 0xde, 0xb2, 0x09, 0x9d, 0x39,
+ 0xf8, 0x63, 0x9c, 0x32, 0x42, 0x7c, 0xa0, 0x30, 0x86, 0x72, 0x7a, 0x4a, 0xc6, 0xd4, 0xb3, 0x2d,
+ 0x24, 0xef, 0x96, 0x3f, 0xc2, 0xda, 0xd3, 0xf2, 0x15, 0x6f, 0xda, 0x65, 0x4b, 0x81, 0x28, 0x68,
+ 0xf4, 0xfe, 0x3e, 0x71, 0x4f, 0x50, 0x96, 0x72, 0x58, 0xa1, 0x89, 0xdd, 0x01, 0x61, 0x39, 0x39,
+ 0xc6, 0x76, 0xa4, 0xda, 0x02, 0x70, 0x3d, 0xc0, 0xdc, 0x8d, 0x70, 0x72, 0x04, 0x90, 0x79, 0xd4,
+ 0xec, 0x65, 0xcf, 0x49, 0x35, 0x25, 0x3a, 0x14, 0x1a, 0x45, 0x20, 0xeb, 0x31, 0xaf, 0x92, 0xba,
+ 0x20, 0xd3, 0xcd, 0xa7, 0x13, 0x44, 0xdc, 0xcf, 0xf0, 0x27, 0x34, 0xb9, 0xe7, 0x24, 0x6f, 0x73,
+ 0xe7, 0xea, 0x77, 0x03,
+ };
+
+ _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *dnskey = NULL, *ds1 = NULL, *ds2 = NULL;
+ _cleanup_free_ char *a = NULL, *b = NULL, *c = NULL;
+
+ /* The two DS RRs in effect for nasa.gov on 2015-12-01. */
+ ds1 = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, "nasa.gov");
+ assert_se(ds1);
+
+ ds1->ds.key_tag = 47857;
+ ds1->ds.algorithm = DNSSEC_ALGORITHM_RSASHA256;
+ ds1->ds.digest_type = DNSSEC_DIGEST_SHA1;
+ ds1->ds.digest_size = sizeof(ds1_fprint);
+ ds1->ds.digest = memdup(ds1_fprint, ds1->ds.digest_size);
+ assert_se(ds1->ds.digest);
+
+ assert_se(dns_resource_record_to_string(ds1, &a) >= 0);
+ log_info("DS1: %s", a);
+
+ ds2 = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DS, "NASA.GOV");
+ assert_se(ds2);
+
+ ds2->ds.key_tag = 47857;
+ ds2->ds.algorithm = DNSSEC_ALGORITHM_RSASHA256;
+ ds2->ds.digest_type = DNSSEC_DIGEST_SHA256;
+ ds2->ds.digest_size = sizeof(ds2_fprint);
+ ds2->ds.digest = memdup(ds2_fprint, ds2->ds.digest_size);
+ assert_se(ds2->ds.digest);
+
+ assert_se(dns_resource_record_to_string(ds2, &b) >= 0);
+ log_info("DS2: %s", b);
+
+ dnskey = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_DNSKEY, "nasa.GOV");
+ assert_se(dnskey);
+
+ dnskey->dnskey.flags = 257;
+ dnskey->dnskey.protocol = 3;
+ dnskey->dnskey.algorithm = DNSSEC_ALGORITHM_RSASHA256;
+ dnskey->dnskey.key_size = sizeof(dnskey_blob);
+ dnskey->dnskey.key = memdup(dnskey_blob, sizeof(dnskey_blob));
+ assert_se(dnskey->dnskey.key);
+
+ assert_se(dns_resource_record_to_string(dnskey, &c) >= 0);
+ log_info("DNSKEY: %s", c);
+ log_info("DNSKEY keytag: %u", dnssec_keytag(dnskey));
+
+ assert_se(dnssec_verify_dnskey(dnskey, ds1) > 0);
+ assert_se(dnssec_verify_dnskey(dnskey, ds2) > 0);
+}
+
+static void test_dnssec_canonicalize_one(const char *original, const char *canonical, int r) {
+ char canonicalized[DNSSEC_CANONICAL_HOSTNAME_MAX];
+
+ assert_se(dnssec_canonicalize(original, canonicalized, sizeof(canonicalized)) == r);
+ if (r < 0)
+ return;
+
+ assert_se(streq(canonicalized, canonical));
+}
+
+static void test_dnssec_canonicalize(void) {
+ test_dnssec_canonicalize_one("", ".", 1);
+ test_dnssec_canonicalize_one(".", ".", 1);
+ test_dnssec_canonicalize_one("foo", "foo.", 4);
+ test_dnssec_canonicalize_one("foo.", "foo.", 4);
+ test_dnssec_canonicalize_one("FOO.", "foo.", 4);
+ test_dnssec_canonicalize_one("FOO.bar.", "foo.bar.", 8);
+ test_dnssec_canonicalize_one("FOO..bar.", NULL, -EINVAL);
+}
+
+int main(int argc, char*argv[]) {
+
+ test_dnssec_canonicalize();
+ test_dnssec_verify_dns_key();
+ test_dnssec_verify_rrset();
+
+ return 0;
+}
diff --git a/src/shared/dns-domain.c b/src/shared/dns-domain.c
index 5ac8ad5b7a..429aa6d2cb 100644
--- a/src/shared/dns-domain.c
+++ b/src/shared/dns-domain.c
@@ -865,7 +865,7 @@ bool dns_name_is_single_label(const char *name) {
}
/* Encode a domain name according to RFC 1035 Section 3.1, without compression */
-int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len) {
+int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical) {
uint8_t *label_length, *out;
int r;
@@ -890,6 +890,20 @@ int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len) {
if (r < 0)
return r;
+ if (canonical) {
+ size_t i;
+
+ /* Optionally, output the name in DNSSEC
+ * canonical format, as described in RFC 4034,
+ * section 6.2. Or in other words: in
+ * lower-case. */
+
+ for (i = 0; i < (size_t) r; i++) {
+ if (out[i] >= 'A' && out[i] <= 'Z')
+ out[i] = out[i] - 'A' + 'a';
+ }
+ }
+
/* Fill label length, move forward */
*label_length = r;
out += r;
diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h
index 44a9975541..e48d8c6b9d 100644
--- a/src/shared/dns-domain.h
+++ b/src/shared/dns-domain.h
@@ -34,6 +34,9 @@
/* Maximum length of a full hostname, consisting of a series of unescaped labels, and no trailing dot or NUL byte */
#define DNS_HOSTNAME_MAX 253
+/* Maximum length of a full hostname, on the wire, including the final NUL byte */
+#define DNS_WIRE_FOMAT_HOSTNAME_MAX 255
+
int dns_label_unescape(const char **name, char *dest, size_t sz);
int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz);
int dns_label_escape(const char *p, size_t l, char *dest, size_t sz);
@@ -77,7 +80,7 @@ int dns_name_address(const char *p, int *family, union in_addr_union *a);
bool dns_name_is_root(const char *name);
bool dns_name_is_single_label(const char *name);
-int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len);
+int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical);
bool dns_srv_type_is_valid(const char *name);
bool dns_service_name_is_valid(const char *name);
diff --git a/src/test/test-dns-domain.c b/src/test/test-dns-domain.c
index 7f53a8cc56..de003e251c 100644
--- a/src/test/test-dns-domain.c
+++ b/src/test/test-dns-domain.c
@@ -56,7 +56,7 @@ static void test_dns_name_to_wire_format_one(const char *what, const char *expec
uint8_t buffer[buffer_sz];
int r;
- r = dns_name_to_wire_format(what, buffer, buffer_sz);
+ r = dns_name_to_wire_format(what, buffer, buffer_sz, false);
assert_se(r == ret);
if (r < 0)
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-20 07:43:06 +0000