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authorLennart Poettering <lennart@poettering.net>2015-12-27 14:05:45 +0100
committerLennart Poettering <lennart@poettering.net>2015-12-28 01:18:55 +0100
commitea3a892fe39037d71afa43aca12bf1e408a686b4 (patch)
tree2ba1976f21fb2147971dac9fe241aba654e6d0d6 /src/resolve
parentfbf1a66d78626b028fd7a5f89c5b605cd74d1e9c (diff)
resolved: split out RSA-specific code from dnssec_verify_rrset()
In preparation for ECDSA support.
Diffstat (limited to 'src/resolve')
-rw-r--r--src/resolve/resolved-dns-dnssec.c110
1 files changed, 62 insertions, 48 deletions
diff --git a/src/resolve/resolved-dns-dnssec.c b/src/resolve/resolved-dns-dnssec.c
index abf4c18ade..263ab3f412 100644
--- a/src/resolve/resolved-dns-dnssec.c
+++ b/src/resolve/resolved-dns-dnssec.c
@@ -136,7 +136,7 @@ static int rr_compare(const void *a, const void *b) {
return 0;
}
-static int dnssec_rsa_verify(
+static int dnssec_rsa_verify_raw(
const char *hash_algorithm,
const void *signature, size_t signature_size,
const void *data, size_t data_size,
@@ -226,6 +226,62 @@ finish:
return r;
}
+static int dnssec_rsa_verify(
+ const char *hash_algorithm,
+ const void *hash, size_t hash_size,
+ DnsResourceRecord *rrsig,
+ DnsResourceRecord *dnskey) {
+
+ size_t exponent_size, modulus_size;
+ void *exponent, *modulus;
+
+ assert(hash_algorithm);
+ assert(hash);
+ assert(hash_size > 0);
+ assert(rrsig);
+ assert(dnskey);
+
+ 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)
+ return -EINVAL;
+
+ if (3 + exponent_size >= dnskey->dnskey.key_size)
+ return -EINVAL;
+
+ 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)
+ return -EINVAL;
+
+ if (1 + exponent_size >= dnskey->dnskey.key_size)
+ return -EINVAL;
+
+ modulus = (uint8_t*) dnskey->dnskey.key + 1 + exponent_size;
+ modulus_size = dnskey->dnskey.key_size - 1 - exponent_size;
+ }
+
+ return dnssec_rsa_verify_raw(
+ hash_algorithm,
+ rrsig->rrsig.signature, rrsig->rrsig.signature_size,
+ hash, hash_size,
+ exponent, exponent_size,
+ modulus, modulus_size);
+}
+
static void md_add_uint8(gcry_md_hd_t md, uint8_t v) {
gcry_md_write(md, &v, sizeof(v));
}
@@ -305,8 +361,8 @@ int dnssec_verify_rrset(
DnssecResult *result) {
uint8_t wire_format_name[DNS_WIRE_FOMAT_HOSTNAME_MAX];
- size_t exponent_size, modulus_size, hash_size;
- void *exponent, *modulus, *hash;
+ size_t hash_size;
+ void *hash;
DnsResourceRecord **list, *rr;
gcry_md_hd_t md = NULL;
int r, algorithm;
@@ -424,53 +480,11 @@ int dnssec_verify_rrset(
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,
+ gcry_md_algo_name(algorithm),
hash, hash_size,
- exponent, exponent_size,
- modulus, modulus_size);
+ rrsig,
+ dnskey);
if (r < 0)
goto finish;