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-rw-r--r--src/libdnssec/key/privkey.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/src/libdnssec/key/privkey.c b/src/libdnssec/key/privkey.c
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+++ b/src/libdnssec/key/privkey.c
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+/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <gnutls/abstract.h>
+#include <gnutls/gnutls.h>
+
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/key/algorithm.h"
+#include "libdnssec/key/convert.h"
+#include "libdnssec/key/dnskey.h"
+#include "libdnssec/key/internal.h"
+#include "libdnssec/key/privkey.h"
+#include "libdnssec/shared/shared.h"
+#include "libdnssec/shared/binary_wire.h"
+
+/* -- internal functions --------------------------------------------------- */
+
+/*!
+ * Check if the algorithm number is valid for given DNSKEY.
+ */
+static bool valid_algorithm(dnssec_key_t *key, gnutls_privkey_t privkey)
+{
+ uint8_t current = dnssec_key_get_algorithm(key);
+ int gnu_algorithm = gnutls_privkey_get_pk_algorithm(privkey, NULL);
+
+ return (gnu_algorithm == algorithm_to_gnutls(current));
+}
+
+/*!
+ * Create GnuTLS public key from private key.
+ */
+static int public_from_private(gnutls_privkey_t privkey, gnutls_pubkey_t *pubkey)
+{
+ assert(privkey);
+ assert(pubkey);
+
+ gnutls_pubkey_t new_key = NULL;
+ int result = gnutls_pubkey_init(&new_key);
+ if (result != GNUTLS_E_SUCCESS) {
+ return DNSSEC_ENOMEM;
+ }
+
+ result = gnutls_pubkey_import_privkey(new_key, privkey, 0, 0);
+ if (result != GNUTLS_E_SUCCESS) {
+ gnutls_pubkey_deinit(new_key);
+ return DNSSEC_KEY_IMPORT_ERROR;
+ }
+
+ *pubkey = new_key;
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Create public key (GnuTLS and DNSKEY RDATA) from a private key.
+ */
+static int create_public_key(gnutls_privkey_t privkey,
+ gnutls_pubkey_t *pubkey_ptr,
+ dnssec_binary_t *rdata)
+{
+ assert(privkey);
+ assert(pubkey_ptr);
+ assert(rdata);
+
+ // crypto public key
+
+ gnutls_pubkey_t pubkey = NULL;
+ int result = public_from_private(privkey, &pubkey);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ // dnssec public key
+
+ _cleanup_binary_ dnssec_binary_t rdata_pubkey = { 0 };
+ result = convert_pubkey_to_dnskey(pubkey, &rdata_pubkey);
+ if (result != DNSSEC_EOK) {
+ gnutls_pubkey_deinit(pubkey);
+ return result;
+ }
+
+ size_t rdata_size = DNSKEY_RDATA_OFFSET_PUBKEY + rdata_pubkey.size;
+ result = dnssec_binary_resize(rdata, rdata_size);
+ if (result != DNSSEC_EOK) {
+ gnutls_pubkey_deinit(pubkey);
+ return result;
+ }
+
+ // updated RDATA
+
+ wire_ctx_t wire = binary_init(rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PUBKEY);
+ binary_write(&wire, &rdata_pubkey);
+ assert(wire_ctx_offset(&wire) == rdata->size);
+
+ *pubkey_ptr = pubkey;
+
+ return DNSSEC_EOK;
+}
+
+/* -- internal API --------------------------------------------------------- */
+
+/*!
+ * Load a private key into a DNSSEC key, create a public part if necessary.
+ */
+int key_set_private_key(dnssec_key_t *key, gnutls_privkey_t privkey)
+{
+ assert(key);
+ assert(privkey);
+ assert(key->private_key == NULL);
+
+ if (!valid_algorithm(key, privkey)) {
+ return DNSSEC_INVALID_KEY_ALGORITHM;
+ }
+
+ if (!key->public_key) {
+ int r = create_public_key(privkey, &key->public_key, &key->rdata);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+ }
+
+ key->private_key = privkey;
+
+ return DNSSEC_EOK;
+}