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-rw-r--r--src/libdnssec/key.h290
-rw-r--r--src/libdnssec/key/algorithm.c180
-rw-r--r--src/libdnssec/key/algorithm.h30
-rw-r--r--src/libdnssec/key/convert.c375
-rw-r--r--src/libdnssec/key/convert.h44
-rw-r--r--src/libdnssec/key/dnskey.c82
-rw-r--r--src/libdnssec/key/dnskey.h46
-rw-r--r--src/libdnssec/key/ds.c128
-rw-r--r--src/libdnssec/key/internal.h35
-rw-r--r--src/libdnssec/key/key.c439
-rw-r--r--src/libdnssec/key/keytag.c88
-rw-r--r--src/libdnssec/key/privkey.c140
-rw-r--r--src/libdnssec/key/privkey.h35
-rw-r--r--src/libdnssec/key/simple.c55
-rw-r--r--src/libdnssec/keyid.c87
-rw-r--r--src/libdnssec/keyid.h64
-rw-r--r--src/libdnssec/keystore.h154
-rw-r--r--src/libdnssec/keystore/internal.h50
-rw-r--r--src/libdnssec/keystore/keystore.c186
-rw-r--r--src/libdnssec/keystore/pkcs11.c396
-rw-r--r--src/libdnssec/keystore/pkcs8.c494
-rw-r--r--src/libdnssec/keytag.h44
22 files changed, 3442 insertions, 0 deletions
diff --git a/src/libdnssec/key.h b/src/libdnssec/key.h
new file mode 100644
index 0000000..e113028
--- /dev/null
+++ b/src/libdnssec/key.h
@@ -0,0 +1,290 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+/*!
+ * \file
+ *
+ * \addtogroup key
+ *
+ * \brief DNSSEC public and private key manipulation.
+ *
+ * The dnssec_key_t is an abstraction for a DNSSEC key pair. If the key
+ * key is initialized with a public key data only, it can be used only for
+ * signature verification. In order to use the key for signing, private key
+ * has to be loaded. If only a private key is loaded into the structure,
+ * the public key is automatically constructed.
+ *
+ * The module interface provides various functions to retrieve information
+ * about the key. But the key is mostly used by other modules of the library.
+ *
+ * @{
+ */
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <libdnssec/binary.h>
+
+/*!
+ * DNSKEY algorithm numbers.
+ *
+ * \see https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml
+ */
+typedef enum dnssec_key_algorithm {
+ DNSSEC_KEY_ALGORITHM_INVALID = 0,
+ DNSSEC_KEY_ALGORITHM_RSA_SHA1 = 5,
+ DNSSEC_KEY_ALGORITHM_RSA_SHA1_NSEC3 = 7,
+ DNSSEC_KEY_ALGORITHM_RSA_SHA256 = 8,
+ DNSSEC_KEY_ALGORITHM_RSA_SHA512 = 10,
+ DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256 = 13,
+ DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384 = 14,
+ DNSSEC_KEY_ALGORITHM_ED25519 = 15,
+ DNSSEC_KEY_ALGORITHM_ED448 = 16,
+} dnssec_key_algorithm_t;
+
+struct dnssec_key;
+
+/*!
+ * DNSSEC key.
+ */
+typedef struct dnssec_key dnssec_key_t;
+
+/*!
+ * Check whether a DNSKEY algorithm is supported.
+ *
+ * @note: less secure algorithms may go unsupported on purpose.
+ * - if IETF RFCs deprecate algorithm even for validation (see RFC 8624)
+ * - if (local) GnuTLS policy considers an algorithm insecure
+ */
+bool dnssec_algorithm_key_support(dnssec_key_algorithm_t algorithm);
+
+/*!
+ * Check if the algorithm allows deterministic signing.
+ */
+bool dnssec_algorithm_reproducible(dnssec_key_algorithm_t algorithm, bool enabled);
+
+/*!
+ * Allocate new DNSSEC key.
+ *
+ * The protocol field of the key is set to 3 (DNSSEC).
+ * The flags field of the key is set to 256 (zone key, no SEP).
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_key_new(dnssec_key_t **key);
+
+/*!
+ * Clear the DNSSEC key.
+ *
+ * Has the same effect as calling \ref dnssec_key_free and \ref dnssec_key_new.
+ */
+void dnssec_key_clear(dnssec_key_t *key);
+
+/*!
+ * Free the key allocated by \ref dnssec_key_new.
+ */
+void dnssec_key_free(dnssec_key_t *key);
+
+/*!
+ * Create a copy of a DNSSEC key.
+ *
+ * Only a public part of the key is copied.
+ */
+dnssec_key_t *dnssec_key_dup(const dnssec_key_t *key);
+
+/*!
+ * Get the key tag of the DNSSEC key.
+ */
+uint16_t dnssec_key_get_keytag(const dnssec_key_t *key);
+
+/*!
+ * Get the domain name of the DNSSEC key.
+ */
+const uint8_t *dnssec_key_get_dname(const dnssec_key_t *key);
+
+/*!
+ * Set the domain name of the DNSSEC key.
+ */
+int dnssec_key_set_dname(dnssec_key_t *key, const uint8_t *dname);
+
+/*!
+ * Get the flags field of the DNSSEC key.
+ */
+uint16_t dnssec_key_get_flags(const dnssec_key_t *key);
+
+/*!
+ * Set the flags field of the DNSSEC key.
+ */
+int dnssec_key_set_flags(dnssec_key_t *key, uint16_t flags);
+
+/*!
+ * Get the protocol field of the DNSSEC key.
+ */
+uint8_t dnssec_key_get_protocol(const dnssec_key_t *key);
+
+/*!
+ * Get the protocol field of the DNSSEC key.
+ */
+int dnssec_key_set_protocol(dnssec_key_t *key, uint8_t protocol);
+
+/*!
+ * Get the algorithm field of the DNSSEC key.
+ */
+uint8_t dnssec_key_get_algorithm(const dnssec_key_t *key);
+
+/*!
+ * Set the algorithm field of the DNSSEC key.
+ *
+ * The function will fail if the algorithm is incompatible with the
+ * loaded key. This means, that the function can be used to set the initial
+ * algorithm and later, only the hashing algorithm can be changed.
+ */
+int dnssec_key_set_algorithm(dnssec_key_t *key, uint8_t algorithm);
+
+/*!
+ * Get the public key field of the DNSSEC key.
+ *
+ * The returned content must not be modified by the caller. A reference
+ * to internally allocated structure is returned.
+ */
+int dnssec_key_get_pubkey(const dnssec_key_t *key, dnssec_binary_t *pubkey);
+
+/*!
+ * Set the public key field of the DNSSEC key.
+ *
+ * A valid algorithm has to be set prior to calling this function.
+ *
+ * The function will fail if the key is already loaded in the structure.
+ */
+int dnssec_key_set_pubkey(dnssec_key_t *key, const dnssec_binary_t *pubkey);
+
+/*!
+ * Get the bit size of the cryptographic key used with the DNSSEC key.
+ */
+unsigned dnssec_key_get_size(const dnssec_key_t *key);
+
+/*!
+ * \brief Compute key ID from public key.
+ *
+ * \param key Key structure holding the public key.
+ * \param id Output: key ID in hex.
+ *
+ * \return DNSSEC_E*
+ */
+int dnssec_key_get_keyid(const dnssec_key_t *key, char **id);
+
+/*!
+ * Get the RDATA of the DNSSEC key.
+ *
+ * The returned content must not be modified by the caller. A reference
+ * to internally allocated structure is returned.
+ */
+int dnssec_key_get_rdata(const dnssec_key_t *key, dnssec_binary_t *rdata);
+
+/*!
+ * Set the RDATA of the DNSSEC key.
+ *
+ * Calling this function has the same effect as setting the individual
+ * fields of the key step-by-step. The same limitations apply.
+ */
+int dnssec_key_set_rdata(dnssec_key_t *key, const dnssec_binary_t *rdata);
+
+/*!
+ * Load PKCS #8 private key in the unencrypted PEM format.
+ *
+ * At least an algorithm must be set prior to calling this function.
+ *
+ * The function will create public key, unless it was already set (using
+ * \ref dnssec_key_set_pubkey or \ref dnssec_key_set_rdata). If the public key
+ * was set, the function will prevent loading of non-matching private key.
+ */
+int dnssec_key_load_pkcs8(dnssec_key_t *key, const dnssec_binary_t *pem);
+
+/*!
+ * Check if the key can be used for signing.
+ */
+bool dnssec_key_can_sign(const dnssec_key_t *key);
+
+/*!
+ * Check if the key can be used for verification.
+ */
+bool dnssec_key_can_verify(const dnssec_key_t *key);
+
+/*!
+ * Get private key size range for a DNSSEC algorithm.
+ *
+ * \param[in] algorithm DNSKEY algorithm.
+ * \param[out] min Minimal size of the private key (can be NULL).
+ * \param[out] max Maximal size of the private key (can be NULL).
+ *
+ * \return DNSSEC_EOK for valid parameters.
+ */
+int dnssec_algorithm_key_size_range(dnssec_key_algorithm_t algorithm,
+ unsigned *min, unsigned *max);
+
+/*!
+ * Check if the private key size matches DNSKEY constraints.
+ *
+ * \param algorithm DNSKEY algorithm.
+ * \param bits Private key size.
+ *
+ * \return DNSKEY algorithm matches the key size constraints.
+ */
+bool dnssec_algorithm_key_size_check(dnssec_key_algorithm_t algorithm,
+ unsigned bits);
+
+/*!
+ * Get default key size for given algorithm.
+ *
+ * The default size is balance between security and response lengths with
+ * respect to use in DNS.
+ */
+int dnssec_algorithm_key_size_default(dnssec_key_algorithm_t algorithm);
+
+/*!
+ * DS algorithm numbers.
+ *
+ * \see https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml
+ */
+typedef enum dnssec_key_digest {
+ DNSSEC_KEY_DIGEST_INVALID = 0,
+ DNSSEC_KEY_DIGEST_SHA1 = 1,
+ DNSSEC_KEY_DIGEST_SHA256 = 2,
+ DNSSEC_KEY_DIGEST_SHA384 = 4,
+} dnssec_key_digest_t;
+
+/*!
+ * Check whether a DS algorithm is supported.
+ *
+ * @note: see note at dnssec_algorithm_key_support().
+ */
+bool dnssec_algorithm_digest_support(dnssec_key_digest_t algorithm);
+
+/*!
+ * Create DS (Delgation Signer) RDATA from DNSSEC key.
+ *
+ * \param[in] key DNSSEC key.
+ * \param[in] digest Digest algorithm to be used.
+ * \param[out] rdata Allocated DS RDATA.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_key_create_ds(const dnssec_key_t *key, dnssec_key_digest_t digest,
+ dnssec_binary_t *rdata);
+
+/*! @} */
diff --git a/src/libdnssec/key/algorithm.c b/src/libdnssec/key/algorithm.c
new file mode 100644
index 0000000..7f32fd4
--- /dev/null
+++ b/src/libdnssec/key/algorithm.c
@@ -0,0 +1,180 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <gnutls/gnutls.h>
+
+#include "libdnssec/error.h"
+#include "libdnssec/key.h"
+#include "libdnssec/key/algorithm.h"
+#include "libdnssec/shared/shared.h"
+
+/* -- internal ------------------------------------------------------------- */
+
+struct limits {
+ unsigned min;
+ unsigned max;
+ unsigned def;
+ bool (*validate)(unsigned bits);
+};
+
+static const struct limits *get_limits(dnssec_key_algorithm_t algorithm)
+{
+ static const struct limits RSA = {
+ .min = 1024,
+ .max = 4096,
+ .def = 2048,
+ };
+
+ static const struct limits EC256 = {
+ .min = 256,
+ .max = 256,
+ .def = 256,
+ };
+
+ static const struct limits EC384 = {
+ .min = 384,
+ .max = 384,
+ .def = 384,
+ };
+
+ static const struct limits ED25519 = {
+ .min = 256,
+ .max = 256,
+ .def = 256,
+ };
+
+ static const struct limits ED448 = {
+ .min = 456,
+ .max = 456,
+ .def = 456,
+ };
+
+ switch (algorithm) {
+ case DNSSEC_KEY_ALGORITHM_RSA_SHA1:
+ case DNSSEC_KEY_ALGORITHM_RSA_SHA1_NSEC3:
+ case DNSSEC_KEY_ALGORITHM_RSA_SHA256:
+ case DNSSEC_KEY_ALGORITHM_RSA_SHA512:
+ return &RSA;
+ case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
+ return &EC256;
+ case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
+ return &EC384;
+ case DNSSEC_KEY_ALGORITHM_ED25519:
+ return &ED25519;
+ case DNSSEC_KEY_ALGORITHM_ED448:
+ return &ED448;
+ default:
+ return NULL;
+ }
+}
+
+/* -- internal API --------------------------------------------------------- */
+
+gnutls_pk_algorithm_t algorithm_to_gnutls(dnssec_key_algorithm_t dnssec)
+{
+ switch (dnssec) {
+ case DNSSEC_KEY_ALGORITHM_RSA_SHA1:
+ case DNSSEC_KEY_ALGORITHM_RSA_SHA1_NSEC3:
+ case DNSSEC_KEY_ALGORITHM_RSA_SHA256:
+ case DNSSEC_KEY_ALGORITHM_RSA_SHA512:
+ return GNUTLS_PK_RSA;
+ case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
+ case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
+ return GNUTLS_PK_EC;
+#ifdef HAVE_ED25519
+ case DNSSEC_KEY_ALGORITHM_ED25519:
+ return GNUTLS_PK_EDDSA_ED25519;
+#endif
+#ifdef HAVE_ED448
+ case DNSSEC_KEY_ALGORITHM_ED448:
+ return GNUTLS_PK_EDDSA_ED448;
+#endif
+ default:
+ return GNUTLS_PK_UNKNOWN;
+ }
+}
+
+/* -- public API ----------------------------------------------------------- */
+
+_public_
+bool dnssec_algorithm_reproducible(dnssec_key_algorithm_t algorithm, bool enabled)
+{
+ (void)enabled;
+ switch (algorithm) {
+ case DNSSEC_KEY_ALGORITHM_ED25519:
+ case DNSSEC_KEY_ALGORITHM_ED448:
+ return true; // those are always reproducible
+ case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
+ case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
+#ifdef HAVE_GLNUTLS_REPRODUCIBLE
+ return enabled; // Reproducible only if GnuTLS supports && enabled
+#else
+ return false;
+#endif
+ default:
+ return false;
+ }
+}
+
+_public_
+int dnssec_algorithm_key_size_range(dnssec_key_algorithm_t algorithm,
+ unsigned *min_ptr, unsigned *max_ptr)
+{
+ if (!min_ptr && !max_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ const struct limits *limits = get_limits(algorithm);
+ if (!limits) {
+ return DNSSEC_INVALID_KEY_ALGORITHM;
+ }
+
+ if (min_ptr) {
+ *min_ptr = limits->min;
+ }
+ if (max_ptr) {
+ *max_ptr = limits->max;
+ }
+
+ return DNSSEC_EOK;
+}
+
+_public_
+bool dnssec_algorithm_key_size_check(dnssec_key_algorithm_t algorithm,
+ unsigned bits)
+{
+ const struct limits *limits = get_limits(algorithm);
+ if (!limits) {
+ return false;
+ }
+
+ if (bits < limits->min || bits > limits->max) {
+ return false;
+ }
+
+ if (limits->validate && !limits->validate(bits)) {
+ return false;
+ }
+
+ return true;
+}
+
+_public_
+int dnssec_algorithm_key_size_default(dnssec_key_algorithm_t algorithm)
+{
+ const struct limits *limits = get_limits(algorithm);
+ return limits ? limits->def : 0;
+}
diff --git a/src/libdnssec/key/algorithm.h b/src/libdnssec/key/algorithm.h
new file mode 100644
index 0000000..4906675
--- /dev/null
+++ b/src/libdnssec/key/algorithm.h
@@ -0,0 +1,30 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gnutls/gnutls.h>
+
+#include "libdnssec/key.h"
+
+/*!
+ * Convert DNSKEY algorithm identifier to GnuTLS identifier.
+ *
+ * \param dnssec DNSSEC DNSKEY algorithm identifier.
+ *
+ * \return GnuTLS private key algorithm identifier, GNUTLS_PK_UNKNOWN on error.
+ */
+gnutls_pk_algorithm_t algorithm_to_gnutls(dnssec_key_algorithm_t dnssec);
diff --git a/src/libdnssec/key/convert.c b/src/libdnssec/key/convert.c
new file mode 100644
index 0000000..56168f7
--- /dev/null
+++ b/src/libdnssec/key/convert.c
@@ -0,0 +1,375 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <gnutls/abstract.h>
+#include <gnutls/gnutls.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "libdnssec/shared/bignum.h"
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/key.h"
+#include "libdnssec/key/algorithm.h"
+#include "libdnssec/key/dnskey.h"
+#include "libdnssec/shared/shared.h"
+#include "libdnssec/shared/binary_wire.h"
+
+/* -- wrappers for GnuTLS types -------------------------------------------- */
+
+static size_t bignum_size_u_datum(const gnutls_datum_t *_bignum)
+{
+ const dnssec_binary_t bignum = binary_from_datum(_bignum);
+ return bignum_size_u(&bignum);
+}
+
+static void wire_write_bignum_datum(wire_ctx_t *ctx, size_t width,
+ const gnutls_datum_t *_bignum)
+{
+ const dnssec_binary_t bignum = binary_from_datum(_bignum);
+ bignum_write(ctx, width, &bignum);
+}
+
+static gnutls_datum_t wire_take_datum(wire_ctx_t *ctx, size_t count)
+{
+ gnutls_datum_t result = { .data = ctx->position, .size = count };
+ ctx->position += count;
+
+ return result;
+}
+
+/* -- DNSSEC to crypto ------------------------------------------------------*/
+
+/*!
+ * Convert RSA public key to DNSSEC format.
+ */
+static int rsa_pubkey_to_rdata(gnutls_pubkey_t key, dnssec_binary_t *rdata)
+{
+ assert(key);
+ assert(rdata);
+
+ _cleanup_datum_ gnutls_datum_t modulus = { 0 };
+ _cleanup_datum_ gnutls_datum_t exponent = { 0 };
+
+ int result = gnutls_pubkey_get_pk_rsa_raw(key, &modulus, &exponent);
+ if (result != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_EXPORT_ERROR;
+ }
+
+ size_t exponent_size = bignum_size_u_datum(&exponent);
+ if (exponent_size > UINT8_MAX) {
+ return DNSSEC_KEY_EXPORT_ERROR;
+ }
+
+ size_t modulus_size = bignum_size_u_datum(&modulus);
+
+ result = dnssec_binary_alloc(rdata, 1 + exponent_size + modulus_size);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ wire_ctx_t wire = binary_init(rdata);
+ wire_ctx_write_u8(&wire, exponent_size);
+ wire_write_bignum_datum(&wire, exponent_size, &exponent);
+ wire_write_bignum_datum(&wire, modulus_size, &modulus);
+ assert(wire_ctx_offset(&wire) == rdata->size);
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Get point size for an ECDSA curve.
+ */
+static size_t ecdsa_curve_point_size(gnutls_ecc_curve_t curve)
+{
+ switch (curve) {
+ case GNUTLS_ECC_CURVE_SECP256R1: return 32;
+ case GNUTLS_ECC_CURVE_SECP384R1: return 48;
+ default: return 0;
+ }
+}
+
+#if defined(HAVE_ED25519) || defined(HAVE_ED448)
+static size_t eddsa_curve_point_size(gnutls_ecc_curve_t curve)
+{
+ switch (curve) {
+#ifdef HAVE_ED25519
+ case GNUTLS_ECC_CURVE_ED25519: return 32;
+#endif
+#ifdef HAVE_ED448
+ case GNUTLS_ECC_CURVE_ED448: return 57;
+#endif
+ default: return 0;
+ }
+}
+#endif
+
+/*!
+ * Convert ECDSA public key to DNSSEC format.
+ */
+static int ecdsa_pubkey_to_rdata(gnutls_pubkey_t key, dnssec_binary_t *rdata)
+{
+ assert(key);
+ assert(rdata);
+
+ _cleanup_datum_ gnutls_datum_t point_x = { 0 };
+ _cleanup_datum_ gnutls_datum_t point_y = { 0 };
+ gnutls_ecc_curve_t curve = { 0 };
+
+ int result = gnutls_pubkey_get_pk_ecc_raw(key, &curve, &point_x, &point_y);
+ if (result != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_EXPORT_ERROR;
+ }
+
+ size_t point_size = ecdsa_curve_point_size(curve);
+ if (point_size == 0) {
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ result = dnssec_binary_alloc(rdata, 2 * point_size);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ wire_ctx_t wire = binary_init(rdata);
+ wire_write_bignum_datum(&wire, point_size, &point_x);
+ wire_write_bignum_datum(&wire, point_size, &point_y);
+ assert(wire_ctx_offset(&wire) == rdata->size);
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Convert EDDSA public key to DNSSEC format.
+ */
+#if defined(HAVE_ED25519) || defined(HAVE_ED448)
+static int eddsa_pubkey_to_rdata(gnutls_pubkey_t key, dnssec_binary_t *rdata)
+{
+ assert(key);
+ assert(rdata);
+
+ _cleanup_datum_ gnutls_datum_t point_x = { 0 };
+ gnutls_ecc_curve_t curve = { 0 };
+
+ int result = gnutls_pubkey_get_pk_ecc_raw(key, &curve, &point_x, NULL);
+ if (result != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_EXPORT_ERROR;
+ }
+
+ size_t point_size = eddsa_curve_point_size(curve);
+ if (point_size == 0) {
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ result = dnssec_binary_alloc(rdata, point_size);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ wire_ctx_t wire = binary_init(rdata);
+ wire_write_bignum_datum(&wire, point_size, &point_x);
+ assert(wire_ctx_offset(&wire) == rdata->size);
+
+ return DNSSEC_EOK;
+}
+#endif
+
+/* -- crypto to DNSSEC ------------------------------------------------------*/
+
+/*!
+ * Convert RSA key in DNSSEC format to crypto key.
+ */
+static int rsa_rdata_to_pubkey(const dnssec_binary_t *rdata, gnutls_pubkey_t key)
+{
+ assert(rdata);
+ assert(key);
+
+ if (rdata->size == 0) {
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ wire_ctx_t ctx = binary_init(rdata);
+
+ // parse public exponent
+
+ uint8_t exponent_size = wire_ctx_read_u8(&ctx);
+ if (exponent_size == 0 || wire_ctx_available(&ctx) < exponent_size) {
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ gnutls_datum_t exponent = wire_take_datum(&ctx, exponent_size);
+
+ // parse modulus
+
+ size_t modulus_size = wire_ctx_available(&ctx);
+ if (modulus_size == 0) {
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ gnutls_datum_t modulus = wire_take_datum(&ctx, modulus_size);
+
+ assert(wire_ctx_offset(&ctx) == rdata->size);
+
+ int result = gnutls_pubkey_import_rsa_raw(key, &modulus, &exponent);
+ if (result != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_IMPORT_ERROR;
+ }
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Get ECDSA curve based on DNSKEY RDATA size.
+ */
+static gnutls_ecc_curve_t ecdsa_curve_from_rdata_size(size_t rdata_size)
+{
+ switch (rdata_size) {
+ case 64: return GNUTLS_ECC_CURVE_SECP256R1;
+ case 96: return GNUTLS_ECC_CURVE_SECP384R1;
+ default: return GNUTLS_ECC_CURVE_INVALID;
+ }
+}
+
+/*!
+ * Get EDDSA curve based on DNSKEY RDATA size.
+ */
+#if defined(HAVE_ED25519) || defined(HAVE_ED448)
+static gnutls_ecc_curve_t eddsa_curve_from_rdata_size(size_t rdata_size)
+{
+ switch (rdata_size) {
+#ifdef HAVE_ED25519
+ case 32: return GNUTLS_ECC_CURVE_ED25519;
+#endif
+#ifdef HAVE_ED448
+ case 57: return GNUTLS_ECC_CURVE_ED448;
+#endif
+ default: return GNUTLS_ECC_CURVE_INVALID;
+ }
+}
+#endif
+
+/*!
+ * Convert ECDSA key in DNSSEC format to crypto key.
+ */
+static int ecdsa_rdata_to_pubkey(const dnssec_binary_t *rdata, gnutls_pubkey_t key)
+{
+ assert(rdata);
+ assert(key);
+
+ gnutls_ecc_curve_t curve = ecdsa_curve_from_rdata_size(rdata->size);
+ if (curve == GNUTLS_ECC_CURVE_INVALID) {
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ // parse points
+
+ wire_ctx_t ctx = binary_init(rdata);
+
+ size_t point_size = wire_ctx_available(&ctx) / 2;
+ gnutls_datum_t point_x = wire_take_datum(&ctx, point_size);
+ gnutls_datum_t point_y = wire_take_datum(&ctx, point_size);
+ assert(wire_ctx_offset(&ctx) == rdata->size);
+
+ int result = gnutls_pubkey_import_ecc_raw(key, curve, &point_x, &point_y);
+ if (result != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_IMPORT_ERROR;
+ }
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Convert EDDSA key in DNSSEC format to crypto key.
+ */
+#if defined(HAVE_ED25519) || defined(HAVE_ED448)
+static int eddsa_rdata_to_pubkey(const dnssec_binary_t *rdata, gnutls_pubkey_t key)
+{
+ assert(rdata);
+ assert(key);
+
+ gnutls_ecc_curve_t curve = eddsa_curve_from_rdata_size(rdata->size);
+ if (curve == GNUTLS_ECC_CURVE_INVALID) {
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ wire_ctx_t ctx = binary_init(rdata);
+
+ size_t point_size = wire_ctx_available(&ctx);
+ gnutls_datum_t point_x = wire_take_datum(&ctx, point_size);
+ assert(wire_ctx_offset(&ctx) == rdata->size);
+
+ int result = gnutls_pubkey_import_ecc_raw(key, curve, &point_x, NULL);
+ if (result != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_IMPORT_ERROR;
+ }
+
+ return DNSSEC_EOK;
+}
+#endif
+
+/* -- internal API --------------------------------------------------------- */
+
+/*!
+ * Encode public key to the format used in DNSKEY RDATA.
+ */
+int convert_pubkey_to_dnskey(gnutls_pubkey_t key, dnssec_binary_t *rdata)
+{
+ assert(key);
+ assert(rdata);
+
+ int algorithm = gnutls_pubkey_get_pk_algorithm(key, NULL);
+ if (algorithm < 0) {
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ switch ((gnutls_pk_algorithm_t)algorithm) {
+ case GNUTLS_PK_RSA: return rsa_pubkey_to_rdata(key, rdata);
+ case GNUTLS_PK_EC: return ecdsa_pubkey_to_rdata(key, rdata);
+#ifdef HAVE_ED25519
+ case GNUTLS_PK_EDDSA_ED25519: return eddsa_pubkey_to_rdata(key, rdata);
+#endif
+#ifdef HAVE_ED448
+ case GNUTLS_PK_EDDSA_ED448: return eddsa_pubkey_to_rdata(key, rdata);
+#endif
+ default: return DNSSEC_INVALID_KEY_ALGORITHM;
+ }
+}
+
+/*!
+ * Create public key from the format encoded in DNSKEY RDATA.
+ */
+int convert_dnskey_to_pubkey(uint8_t algorithm, const dnssec_binary_t *rdata,
+ gnutls_pubkey_t key)
+{
+ assert(rdata);
+ assert(key);
+
+ gnutls_pk_algorithm_t gnutls_alg = algorithm_to_gnutls(algorithm);
+
+ switch(gnutls_alg) {
+ case GNUTLS_PK_RSA: return rsa_rdata_to_pubkey(rdata, key);
+ case GNUTLS_PK_EC: return ecdsa_rdata_to_pubkey(rdata, key);
+#ifdef HAVE_ED25519
+ case GNUTLS_PK_EDDSA_ED25519: return eddsa_rdata_to_pubkey(rdata, key);
+#endif
+#ifdef HAVE_ED448
+ case GNUTLS_PK_EDDSA_ED448: return eddsa_rdata_to_pubkey(rdata, key);
+#endif
+ default: return DNSSEC_INVALID_KEY_ALGORITHM;
+ }
+}
diff --git a/src/libdnssec/key/convert.h b/src/libdnssec/key/convert.h
new file mode 100644
index 0000000..079a5f6
--- /dev/null
+++ b/src/libdnssec/key/convert.h
@@ -0,0 +1,44 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gnutls/abstract.h>
+
+#include "libdnssec/binary.h"
+#include "libdnssec/key.h"
+
+/*!
+ * Encode public key into the format used in DNSKEY RDATA.
+ *
+ * \param[in] key Public key to be encoded.
+ * \param[out] rdata Encoded key (allocated).
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int convert_pubkey_to_dnskey(gnutls_pubkey_t key, dnssec_binary_t *rdata);
+
+/*!
+ * Create public key from the format encoded in DNSKEY RDATA.
+ *
+ * \param[in] algorithm DNSSEC algorithm identification.
+ * \param[in] rdata Public key in DNSKEY RDATA format.
+ * \param[out] key GnuTLS public key (initialized).
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int convert_dnskey_to_pubkey(uint8_t algorithm, const dnssec_binary_t *rdata,
+ gnutls_pubkey_t key);
diff --git a/src/libdnssec/key/dnskey.c b/src/libdnssec/key/dnskey.c
new file mode 100644
index 0000000..c336381
--- /dev/null
+++ b/src/libdnssec/key/dnskey.c
@@ -0,0 +1,82 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/key/dnskey.h"
+#include "libdnssec/key/convert.h"
+#include "libdnssec/shared/binary_wire.h"
+
+/* -- internal API --------------------------------------------------------- */
+
+/*!
+ * Update 'Public key' field of DNSKEY RDATA.
+ */
+int dnskey_rdata_set_pubkey(dnssec_binary_t *rdata, const dnssec_binary_t *pubkey)
+{
+ assert(rdata);
+ assert(pubkey);
+
+ size_t new_size = DNSKEY_RDATA_OFFSET_PUBKEY + pubkey->size;
+ int result = dnssec_binary_resize(rdata, new_size);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ wire_ctx_t wire = binary_init(rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PUBKEY);
+ binary_write(&wire, pubkey);
+ assert(wire_ctx_offset(&wire) == rdata->size);
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Create a GnuTLS public key from DNSKEY RDATA.
+ *
+ * \param rdata DNSKEY RDATA.
+ * \param key_ptr Resulting public key.
+ */
+int dnskey_rdata_to_crypto_key(const dnssec_binary_t *rdata, gnutls_pubkey_t *key_ptr)
+{
+ assert(rdata);
+ assert(key_ptr);
+
+ uint8_t algorithm = 0;
+ dnssec_binary_t rdata_pubkey = { 0 };
+
+ wire_ctx_t wire = binary_init(rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_ALGORITHM);
+ algorithm = wire_ctx_read_u8(&wire);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PUBKEY);
+ binary_available(&wire, &rdata_pubkey);
+
+ gnutls_pubkey_t key = NULL;
+ int result = gnutls_pubkey_init(&key);
+ if (result != GNUTLS_E_SUCCESS) {
+ return DNSSEC_ENOMEM;
+ }
+
+ result = convert_dnskey_to_pubkey(algorithm, &rdata_pubkey, key);
+ if (result != DNSSEC_EOK) {
+ gnutls_pubkey_deinit(key);
+ return result;
+ }
+
+ *key_ptr = key;
+
+ return DNSSEC_EOK;
+}
diff --git a/src/libdnssec/key/dnskey.h b/src/libdnssec/key/dnskey.h
new file mode 100644
index 0000000..e765046
--- /dev/null
+++ b/src/libdnssec/key/dnskey.h
@@ -0,0 +1,46 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gnutls/abstract.h>
+
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+
+/*!
+ * DNSKEY RDATA fields offsets.
+ *
+ * \see RFC 4034 (section 2.1)
+ */
+enum dnskey_rdata_offsets {
+ DNSKEY_RDATA_OFFSET_FLAGS = 0,
+ DNSKEY_RDATA_OFFSET_PROTOCOL = 2,
+ DNSKEY_RDATA_OFFSET_ALGORITHM = 3,
+ DNSKEY_RDATA_OFFSET_PUBKEY = 4,
+};
+
+/*!
+ * Update 'Public key' field of DNSKEY RDATA.
+ */
+int dnskey_rdata_set_pubkey(dnssec_binary_t *rdata,
+ const dnssec_binary_t *pubkey);
+
+/*!
+ * Create a GnuTLS public key from DNSKEY RDATA.
+ */
+int dnskey_rdata_to_crypto_key(const dnssec_binary_t *rdata,
+ gnutls_pubkey_t *key_ptr);
diff --git a/src/libdnssec/key/ds.c b/src/libdnssec/key/ds.c
new file mode 100644
index 0000000..ad580ad
--- /dev/null
+++ b/src/libdnssec/key/ds.c
@@ -0,0 +1,128 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/key.h"
+#include "libdnssec/key/internal.h"
+#include "libdnssec/shared/dname.h"
+#include "libdnssec/shared/shared.h"
+#include "libdnssec/shared/binary_wire.h"
+
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+/*!
+ * Convert DNSSEC DS digest algorithm to GnuTLS digest algorithm.
+ */
+static gnutls_digest_algorithm_t lookup_algorithm(dnssec_key_digest_t algorithm)
+{
+ switch (algorithm) {
+ case DNSSEC_KEY_DIGEST_SHA1: return GNUTLS_DIG_SHA1;
+ case DNSSEC_KEY_DIGEST_SHA256: return GNUTLS_DIG_SHA256;
+ case DNSSEC_KEY_DIGEST_SHA384: return GNUTLS_DIG_SHA384;
+ default:
+ return GNUTLS_DIG_UNKNOWN;
+ };
+}
+
+_public_
+bool dnssec_algorithm_digest_support(dnssec_key_digest_t algorithm)
+{
+ /* GnuTLS docs:
+ * > It is not possible to query for insecure hash algorithms directly
+ * > (only indirectly through the signature API).
+ * So let's query combining the hash with RSA.
+ */
+ gnutls_sign_algorithm_t rsa;
+ switch (algorithm) {
+ case DNSSEC_KEY_DIGEST_SHA1: rsa = GNUTLS_SIGN_RSA_SHA1; break;
+ case DNSSEC_KEY_DIGEST_SHA256: rsa = GNUTLS_SIGN_RSA_SHA256; break;
+ case DNSSEC_KEY_DIGEST_SHA384: rsa = GNUTLS_SIGN_RSA_SHA384; break;
+ default:
+ return false;
+ };
+ return gnutls_sign_is_secure(rsa);
+}
+
+static void wire_write_digest(wire_ctx_t *wire,
+ gnutls_hash_hd_t digest, int digest_size)
+{
+ assert(wire_ctx_available(wire) >= digest_size);
+ gnutls_hash_output(digest, wire->position);
+ wire->position += digest_size;
+}
+
+_public_
+int dnssec_key_create_ds(const dnssec_key_t *key,
+ dnssec_key_digest_t ds_algorithm,
+ dnssec_binary_t *rdata_ptr)
+{
+ if (!key || !rdata_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ if (!key->dname) {
+ return DNSSEC_INVALID_KEY_NAME;
+ }
+
+ if (!key->public_key){
+ return DNSSEC_INVALID_PUBLIC_KEY;
+ }
+
+ gnutls_digest_algorithm_t algorithm = lookup_algorithm(ds_algorithm);
+ if (algorithm == GNUTLS_DIG_UNKNOWN) {
+ return DNSSEC_INVALID_DS_ALGORITHM;
+ }
+
+ // compute DS hash
+
+ _cleanup_hash_ gnutls_hash_hd_t digest = NULL;
+ int r = gnutls_hash_init(&digest, algorithm);
+ if (r < 0) {
+ return DNSSEC_DS_HASHING_ERROR;
+ }
+
+ if (gnutls_hash(digest, key->dname, dname_length(key->dname)) != 0 ||
+ gnutls_hash(digest, key->rdata.data, key->rdata.size) != 0
+ ) {
+ return DNSSEC_DS_HASHING_ERROR;
+ }
+
+ // build DS RDATA
+
+ int digest_size = gnutls_hash_get_len(algorithm);
+ if (digest_size == 0) {
+ return DNSSEC_DS_HASHING_ERROR;
+ }
+
+ dnssec_binary_t rdata = { 0 };
+ r = dnssec_binary_alloc(&rdata, 4 + digest_size);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ wire_ctx_t wire = binary_init(&rdata);
+ wire_ctx_write_u16(&wire, dnssec_key_get_keytag(key));
+ wire_ctx_write_u8(&wire, dnssec_key_get_algorithm(key));
+ wire_ctx_write_u8(&wire, ds_algorithm);
+ wire_write_digest(&wire, digest, digest_size);
+ assert(wire_ctx_offset(&wire) == wire.size);
+
+ *rdata_ptr = rdata;
+
+ return DNSSEC_EOK;
+}
diff --git a/src/libdnssec/key/internal.h b/src/libdnssec/key/internal.h
new file mode 100644
index 0000000..550e454
--- /dev/null
+++ b/src/libdnssec/key/internal.h
@@ -0,0 +1,35 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gnutls/abstract.h>
+#include <stdint.h>
+
+#include "libdnssec/key.h"
+#include "libdnssec/shared/dname.h"
+
+/*!
+ * DNSSEC key.
+ */
+struct dnssec_key {
+ uint8_t *dname;
+ dnssec_binary_t rdata;
+
+ gnutls_pubkey_t public_key;
+ gnutls_privkey_t private_key;
+ unsigned bits;
+};
diff --git a/src/libdnssec/key/key.c b/src/libdnssec/key/key.c
new file mode 100644
index 0000000..f363167
--- /dev/null
+++ b/src/libdnssec/key/key.c
@@ -0,0 +1,439 @@
+/* Copyright (C) 2019 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <gnutls/abstract.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/key.h"
+#include "libdnssec/key/algorithm.h"
+#include "libdnssec/key/convert.h"
+#include "libdnssec/key/dnskey.h"
+#include "libdnssec/key/internal.h"
+#include "libdnssec/shared/keyid_gnutls.h"
+#include "libdnssec/keystore.h"
+#include "libdnssec/keytag.h"
+#include "libdnssec/shared/shared.h"
+#include "libdnssec/shared/binary_wire.h"
+#include "contrib/wire_ctx.h"
+
+/*!
+ * Minimal size of DNSKEY RDATA.
+ */
+#define DNSKEY_RDATA_MIN_SIZE DNSKEY_RDATA_OFFSET_PUBKEY
+
+/*!
+ * RDATA template for newly allocated keys.
+ */
+static const dnssec_binary_t DNSKEY_RDATA_TEMPLATE = {
+ .size = 4,
+ .data = (uint8_t []) { 0x01, 0x00, 0x03, 0x00 }
+};
+
+/* -- key allocation ------------------------------------------------------- */
+
+_public_
+int dnssec_key_new(dnssec_key_t **key_ptr)
+{
+ if (!key_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ dnssec_key_t *key = calloc(1, sizeof(*key));
+ if (!key) {
+ return DNSSEC_ENOMEM;
+ }
+
+ int r = dnssec_binary_dup(&DNSKEY_RDATA_TEMPLATE, &key->rdata);
+ if (r != DNSSEC_EOK) {
+ free(key);
+ return DNSSEC_ENOMEM;
+ }
+
+ *key_ptr = key;
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Clear allocated fields inside the key structure, except RDATA.
+ */
+static void key_free_internals(dnssec_key_t *key)
+{
+ assert(key);
+
+ free(key->dname);
+ key->dname = NULL;
+
+ gnutls_privkey_deinit(key->private_key);
+ key->private_key = NULL;
+
+ gnutls_pubkey_deinit(key->public_key);
+ key->public_key = NULL;
+}
+
+_public_
+void dnssec_key_clear(dnssec_key_t *key)
+{
+ if (!key) {
+ return;
+ }
+
+ // reuse RDATA
+ dnssec_binary_t rdata = key->rdata;
+
+ // clear the structure
+ key_free_internals(key);
+ clear_struct(key);
+
+ // restore template RDATA (downsize, no need to realloc)
+ assert(rdata.size >= DNSKEY_RDATA_MIN_SIZE);
+ rdata.size = DNSKEY_RDATA_MIN_SIZE;
+ memmove(rdata.data, DNSKEY_RDATA_TEMPLATE.data, rdata.size);
+
+ key->rdata = rdata;
+}
+
+_public_
+void dnssec_key_free(dnssec_key_t *key)
+{
+ if (!key) {
+ return;
+ }
+
+ key_free_internals(key);
+ dnssec_binary_free(&key->rdata);
+
+ free(key);
+}
+
+_public_
+dnssec_key_t *dnssec_key_dup(const dnssec_key_t *key)
+{
+ if (!key) {
+ return NULL;
+ }
+
+ dnssec_key_t *dup = NULL;
+
+ if (dnssec_key_new(&dup) != DNSSEC_EOK ||
+ dnssec_key_set_dname(dup, key->dname) != DNSSEC_EOK ||
+ dnssec_key_set_rdata(dup, &key->rdata) != DNSSEC_EOK
+ ) {
+ dnssec_key_free(dup);
+ return NULL;
+ }
+
+ return dup;
+}
+
+/* -- freely modifiable attributes ----------------------------------------- */
+
+_public_
+const uint8_t *dnssec_key_get_dname(const dnssec_key_t *key)
+{
+ if (!key) {
+ return NULL;
+ }
+
+ return key->dname;
+}
+
+_public_
+int dnssec_key_set_dname(dnssec_key_t *key, const uint8_t *dname)
+{
+ if (!key) {
+ return DNSSEC_EINVAL;
+ }
+
+ uint8_t *copy = NULL;
+ if (dname) {
+ copy = dname_copy(dname);
+ if (!copy) {
+ return DNSSEC_ENOMEM;
+ }
+
+ dname_normalize(copy);
+ }
+
+ free(key->dname);
+ key->dname = copy;
+
+ return DNSSEC_EOK;
+}
+
+_public_
+uint16_t dnssec_key_get_flags(const dnssec_key_t *key)
+{
+ if (!key) {
+ return 0;
+ }
+
+ wire_ctx_t wire = binary_init(&key->rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_FLAGS);
+ return wire_ctx_read_u16(&wire);
+}
+
+_public_
+int dnssec_key_set_flags(dnssec_key_t *key, uint16_t flags)
+{
+ if (!key) {
+ return DNSSEC_EINVAL;
+ }
+
+ wire_ctx_t wire = binary_init(&key->rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_FLAGS);
+ wire_ctx_write_u16(&wire, flags);
+
+ return DNSSEC_EOK;
+}
+
+_public_
+uint8_t dnssec_key_get_protocol(const dnssec_key_t *key)
+{
+ if (!key) {
+ return 0;
+ }
+
+ wire_ctx_t wire = binary_init(&key->rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PROTOCOL);
+ return wire_ctx_read_u8(&wire);
+}
+
+_public_
+int dnssec_key_set_protocol(dnssec_key_t *key, uint8_t protocol)
+{
+ if (!key) {
+ return DNSSEC_EINVAL;
+ }
+
+ wire_ctx_t wire = binary_init(&key->rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PROTOCOL);
+ wire_ctx_write_u8(&wire, protocol);
+
+ return DNSSEC_EOK;
+}
+
+/* -- restricted attributes ------------------------------------------------ */
+
+_public_
+uint16_t dnssec_key_get_keytag(const dnssec_key_t *key)
+{
+ uint16_t keytag = 0;
+ if (dnssec_key_can_verify(key)) {
+ dnssec_keytag(&key->rdata, &keytag);
+ }
+
+ return keytag;
+}
+
+/*!
+ * Check if current public key algorithm matches with the new algorithm.
+ */
+static bool can_change_algorithm(dnssec_key_t *key, uint8_t algorithm)
+{
+ assert(key);
+
+ if (!key->public_key) {
+ return true;
+ }
+
+ gnutls_pk_algorithm_t update = algorithm_to_gnutls(algorithm);
+ if (update == GNUTLS_PK_UNKNOWN) {
+ return false;
+ }
+
+ int current = gnutls_pubkey_get_pk_algorithm(key->public_key, NULL);
+ assert(current >= 0);
+
+ return current == update;
+}
+
+_public_
+uint8_t dnssec_key_get_algorithm(const dnssec_key_t *key)
+{
+ if (!key) {
+ return 0;
+ }
+
+ wire_ctx_t wire = binary_init(&key->rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_ALGORITHM);
+ return wire_ctx_read_u8(&wire);
+}
+
+_public_
+int dnssec_key_set_algorithm(dnssec_key_t *key, uint8_t algorithm)
+{
+ if (!key) {
+ return DNSSEC_EINVAL;
+ }
+
+ if (!can_change_algorithm(key, algorithm)) {
+ return DNSSEC_INVALID_KEY_ALGORITHM;
+ }
+
+ wire_ctx_t wire = binary_init(&key->rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_ALGORITHM);
+ wire_ctx_write_u8(&wire, algorithm);
+
+ return DNSSEC_EOK;
+}
+
+_public_
+int dnssec_key_get_pubkey(const dnssec_key_t *key, dnssec_binary_t *pubkey)
+{
+ if (!key || !pubkey) {
+ return DNSSEC_EINVAL;
+ }
+
+ wire_ctx_t wire = binary_init(&key->rdata);
+ wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PUBKEY);
+ binary_available(&wire, pubkey);
+
+ return DNSSEC_EOK;
+}
+
+_public_
+int dnssec_key_set_pubkey(dnssec_key_t *key, const dnssec_binary_t *pubkey)
+{
+ if (!key || !pubkey || !pubkey->data) {
+ return DNSSEC_EINVAL;
+ }
+
+ if (key->public_key) {
+ return DNSSEC_KEY_ALREADY_PRESENT;
+ }
+
+ if (dnssec_key_get_algorithm(key) == 0) {
+ return DNSSEC_INVALID_KEY_ALGORITHM;
+ }
+
+ int result = dnskey_rdata_set_pubkey(&key->rdata, pubkey);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ result = dnskey_rdata_to_crypto_key(&key->rdata, &key->public_key);
+ if (result != DNSSEC_EOK) {
+ key->rdata.size = DNSKEY_RDATA_OFFSET_PUBKEY; // downsize
+ return result;
+ }
+
+ return DNSSEC_EOK;
+}
+
+_public_
+unsigned dnssec_key_get_size(const dnssec_key_t *key)
+{
+ if (!key || !key->public_key) {
+ return 0;
+ }
+
+ unsigned bits = 0;
+ uint8_t algorithm = dnssec_key_get_algorithm(key);
+ switch (algorithm) {
+ case 13:
+ bits = 256;
+ break;
+ case 14:
+ bits = 384;
+ break;
+ case 15:
+ bits = 256;
+ break;
+ case 16:
+ bits = 456;
+ break;
+ default:
+ gnutls_pubkey_get_pk_algorithm(key->public_key, &bits);
+ }
+
+ return bits;
+}
+
+_public_
+int dnssec_key_get_keyid(const dnssec_key_t *key, char **id)
+{
+ if (!key || !id) {
+ return DNSSEC_EINVAL;
+ }
+
+ return keyid_pubkey_hex(key->public_key, id);
+}
+
+_public_
+int dnssec_key_get_rdata(const dnssec_key_t *key, dnssec_binary_t *rdata)
+{
+ if (!key || !rdata) {
+ return DNSSEC_EINVAL;
+ }
+
+ *rdata = key->rdata;
+
+ return DNSSEC_EOK;
+}
+
+_public_
+int dnssec_key_set_rdata(dnssec_key_t *key, const dnssec_binary_t *rdata)
+{
+ if (!key || !rdata || !rdata->data) {
+ return DNSSEC_EINVAL;
+ }
+
+ if (rdata->size < DNSKEY_RDATA_MIN_SIZE) {
+ return DNSSEC_MALFORMED_DATA;
+ }
+
+ if (key->public_key) {
+ return DNSSEC_KEY_ALREADY_PRESENT;
+ }
+
+ gnutls_pubkey_t new_pubkey = NULL;
+ int result = dnskey_rdata_to_crypto_key(rdata, &new_pubkey);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ result = dnssec_binary_resize(&key->rdata, rdata->size);
+ if (result != DNSSEC_EOK) {
+ gnutls_pubkey_deinit(new_pubkey);
+ return result;
+ }
+
+ // commit result
+ memmove(key->rdata.data, rdata->data, rdata->size);
+ key->public_key = new_pubkey;
+
+ return DNSSEC_EOK;
+}
+
+/* -- key presence checking ------------------------------------------------ */
+
+_public_
+bool dnssec_key_can_sign(const dnssec_key_t *key)
+{
+ return key && key->private_key;
+}
+
+_public_
+bool dnssec_key_can_verify(const dnssec_key_t *key)
+{
+ return key && key->public_key;
+}
diff --git a/src/libdnssec/key/keytag.c b/src/libdnssec/key/keytag.c
new file mode 100644
index 0000000..a14353e
--- /dev/null
+++ b/src/libdnssec/key/keytag.c
@@ -0,0 +1,88 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/key/dnskey.h"
+#include "libdnssec/shared/shared.h"
+
+/*!
+ * Compute keytag for RSA/MD5 key.
+ *
+ * \see RFC 2537 (section 2), RFC 4034 (appendix B.1)
+ */
+static uint16_t keytag_compat(const dnssec_binary_t *rdata)
+{
+ assert(rdata);
+ assert(rdata->data);
+
+ if (rdata->size < 9) { // in fact, the condition could be stricter
+ return 0;
+ }
+
+ uint8_t msb = rdata->data[rdata->size - 3];
+ uint8_t lsb = rdata->data[rdata->size - 2];
+
+ return (msb << 8) + lsb;
+}
+
+/*!
+ * Compute keytag for other than RSA/MD5 key.
+ *
+ * \see RFC 4034 (appendix B)
+ */
+static uint16_t keytag_current(const dnssec_binary_t *rdata)
+{
+ assert(rdata);
+ assert(rdata->data);
+
+ uint32_t ac = 0;
+ for (int i = 0; i < rdata->size; i++) {
+ ac += (i & 1) ? rdata->data[i] : rdata->data[i] << 8;
+ }
+
+ return (ac >> 16) + ac;
+}
+
+/* -- public API ----------------------------------------------------------- */
+
+/*!
+ * Compute keytag for a DNSSEC key.
+ */
+_public_
+int dnssec_keytag(const dnssec_binary_t *rdata, uint16_t *keytag)
+{
+ if (!rdata || !keytag) {
+ return DNSSEC_EINVAL;
+ }
+
+ if (!rdata->data || rdata->size < DNSKEY_RDATA_OFFSET_PUBKEY) {
+ return DNSSEC_MALFORMED_DATA;
+ }
+
+ uint8_t algorithm = rdata->data[DNSKEY_RDATA_OFFSET_ALGORITHM];
+ if (algorithm == 1) {
+ *keytag = keytag_compat(rdata);
+ } else {
+ *keytag = keytag_current(rdata);
+ }
+
+ return DNSSEC_EOK;
+}
diff --git a/src/libdnssec/key/privkey.c b/src/libdnssec/key/privkey.c
new file mode 100644
index 0000000..abe968a
--- /dev/null
+++ b/src/libdnssec/key/privkey.c
@@ -0,0 +1,140 @@
+/* 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 <https://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;
+}
diff --git a/src/libdnssec/key/privkey.h b/src/libdnssec/key/privkey.h
new file mode 100644
index 0000000..8afe7c9
--- /dev/null
+++ b/src/libdnssec/key/privkey.h
@@ -0,0 +1,35 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gnutls/abstract.h>
+
+#include "libdnssec/key.h"
+
+/*!
+ * Load a private key into a DNSSEC key, create a public part if necessary.
+ *
+ * If the public key is not loaded, at least an algorithm must be set.
+ *
+ * Updates private key, public key, RDATA, and key identifiers.
+ *
+ * \param key DNSSEC key to be updated.
+ * \param privkey Private key to be set.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int key_set_private_key(dnssec_key_t *key, gnutls_privkey_t privkey);
diff --git a/src/libdnssec/key/simple.c b/src/libdnssec/key/simple.c
new file mode 100644
index 0000000..10126cc
--- /dev/null
+++ b/src/libdnssec/key/simple.c
@@ -0,0 +1,55 @@
+/* Copyright (C) 2019 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <gnutls/abstract.h>
+#include <gnutls/gnutls.h>
+
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/key.h"
+#include "libdnssec/key/dnskey.h"
+#include "libdnssec/key/internal.h"
+#include "libdnssec/key/privkey.h"
+#include "libdnssec/pem.h"
+#include "libdnssec/shared/shared.h"
+
+/* -- public API ----------------------------------------------------------- */
+
+_public_
+int dnssec_key_load_pkcs8(dnssec_key_t *key, const dnssec_binary_t *pem)
+{
+ if (!key || !pem || !pem->data) {
+ return DNSSEC_EINVAL;
+ }
+
+ if (dnssec_key_get_algorithm(key) == 0) {
+ return DNSSEC_INVALID_KEY_ALGORITHM;
+ }
+
+ gnutls_privkey_t privkey = NULL;
+ int r = dnssec_pem_to_privkey(pem, &privkey);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ r = key_set_private_key(key, privkey);
+ if (r != DNSSEC_EOK) {
+ gnutls_privkey_deinit(privkey);
+ return r;
+ }
+
+ return DNSSEC_EOK;
+}
diff --git a/src/libdnssec/keyid.c b/src/libdnssec/keyid.c
new file mode 100644
index 0000000..5a6f29d
--- /dev/null
+++ b/src/libdnssec/keyid.c
@@ -0,0 +1,87 @@
+/* Copyright (C) 2019 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include "libdnssec/error.h"
+#include "libdnssec/keyid.h"
+#include "libdnssec/shared/shared.h"
+
+#include "contrib/ctype.h"
+#include "contrib/tolower.h"
+
+/* -- public API ----------------------------------------------------------- */
+
+_public_
+bool dnssec_keyid_is_valid(const char *id)
+{
+ if (!id) {
+ return false;
+ }
+
+ if (strlen(id) % 2 != 0) {
+ return false;
+ }
+
+ for (int i = 0; id[i] != '\0'; i++) {
+ if (!is_xdigit(id[i])) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+_public_
+void dnssec_keyid_normalize(char *id)
+{
+ if (!id) {
+ return;
+ }
+
+ for (size_t i = 0; id[i] != '\0'; i++) {
+ assert(id[i] != '\0' && is_xdigit(id[i]));
+ id[i] = knot_tolower(id[i]);
+ }
+}
+
+_public_
+char *dnssec_keyid_copy(const char *id)
+{
+ if (!id) {
+ return NULL;
+ }
+
+ char *copy = strdup(id);
+ if (!copy) {
+ return NULL;
+ }
+
+ dnssec_keyid_normalize(copy);
+
+ return copy;
+}
+
+_public_
+bool dnssec_keyid_equal(const char *one, const char *two)
+{
+ if (!one || !two) {
+ return NULL;
+ }
+
+ return (strcasecmp(one, two) == 0);
+}
diff --git a/src/libdnssec/keyid.h b/src/libdnssec/keyid.h
new file mode 100644
index 0000000..c90bb1c
--- /dev/null
+++ b/src/libdnssec/keyid.h
@@ -0,0 +1,64 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+/*!
+ * \file
+ *
+ * \addtogroup keyid
+ *
+ * \brief DNSSEC key ID manipulation.
+ *
+ * The module contains auxiliary functions for manipulation with key IDs.
+ *
+ * @{
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/*!
+ * Length of the key ID in presentation form (ASCII).
+ */
+#define DNSSEC_KEYID_SIZE 40
+
+/*!
+ * Length of the key ID in internal form (binary).
+ */
+#define DNSSEC_KEYID_BINARY_SIZE 20
+
+/*!
+ * Check if a provided string is a valid key ID string.
+ */
+bool dnssec_keyid_is_valid(const char *id);
+
+/*!
+ * Normalize the key ID string.
+ */
+void dnssec_keyid_normalize(char *id);
+
+/*!
+ * Create a normalized copy if the key ID.
+ */
+char *dnssec_keyid_copy(const char *id);
+
+/*!
+ * Check if two key IDs are equal.
+ */
+bool dnssec_keyid_equal(const char *one, const char *two);
+
+/*! @} */
diff --git a/src/libdnssec/keystore.h b/src/libdnssec/keystore.h
new file mode 100644
index 0000000..1eeda4c
--- /dev/null
+++ b/src/libdnssec/keystore.h
@@ -0,0 +1,154 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+/*!
+ * \file
+ *
+ * \addtogroup keystore
+ *
+ * \brief Private key store access.
+ *
+ * The module provides abstraction for private key store. Basically, PKCS #8
+ * and PKCS #11 interfaces are supported.
+ *
+ * PKCS #8 uses unencrypted PEM.
+ *
+ * PKCS #11 provides access Hardware Security Modules.
+ *
+ * @{
+ */
+
+#pragma once
+
+#include <libdnssec/binary.h>
+#include <libdnssec/key.h>
+
+struct dnssec_keystore;
+
+/*!
+ * DNSSEC private keys store.
+ */
+typedef struct dnssec_keystore dnssec_keystore_t;
+
+/*!
+ * Create default PKCS #8 private key store context.
+ *
+ * The default store maintains the private keys in one directory on the file
+ * system. The private keys are stored in unencrypted PEM format, named
+ * key-id.pem. The configuration string is a path to the directory.
+ *
+ * \param[out] store Opened key store.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_keystore_init_pkcs8(dnssec_keystore_t **store);
+
+/*!
+ * Crate new PKCS #11 private key store context.
+ *
+ * \param[out] store Opened key store.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_keystore_init_pkcs11(dnssec_keystore_t **store);
+
+/*!
+ * Deinitialize private key store context.
+ *
+ * \param store Key store to be deinitialized.
+ */
+int dnssec_keystore_deinit(dnssec_keystore_t *store);
+
+/*!
+ * Initialize new private key store.
+ */
+int dnssec_keystore_init(dnssec_keystore_t *store, const char *config);
+
+/*!
+ * Open private key store.
+ */
+int dnssec_keystore_open(dnssec_keystore_t *store, const char *config);
+
+/*!
+ * Close private key store.
+ *
+ * \param store Key store to be closed.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_keystore_close(dnssec_keystore_t *store);
+
+/*!
+ * Generate a new key in the key store.
+ *
+ * \param[in] store Key store.
+ * \param[in] algorithm Algorithm.
+ * \param[in] bits Bit length of the key to be generated.
+ * \param[out] id_ptr ID of the generated key. Must be freed by the caller.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_keystore_generate(dnssec_keystore_t *store,
+ dnssec_key_algorithm_t algorithm,
+ unsigned bits, char **id_ptr);
+
+/*!
+ * Import an existing key into the key store.
+ *
+ * \param[in] store Key store.
+ * \param[in] pem Private key material in PEM format.
+ * \param[out] id_ptr ID of the imported key. Must be freed by the caller.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_keystore_import(dnssec_keystore_t *store, const dnssec_binary_t *pem,
+ char **id_ptr);
+
+/*!
+ * Remove a private key from the key store.
+ *
+ * \param store Key store.
+ * \param id ID of the private key to be deleted.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_keystore_remove(dnssec_keystore_t *store, const char *id);
+
+/*!
+ * Export private key from the key store into a DNSSEC key.
+ *
+ * The key algorithm has to be set before calling this function.
+ *
+ * \param store Private key store.
+ * \param id ID of the key.
+ * \param key DNSSEC key to be initialized.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_keystore_get_private(dnssec_keystore_t *store, const char *id,
+ dnssec_key_t *key);
+
+/*!
+ * Import a DNSSEC private key into key store.
+ *
+ * \param store Key store.
+ * \param key DNSSEC key with a private key.
+ *
+ * \return Error code, DNSSEC_EOK if successful.
+ */
+int dnssec_keystore_set_private(dnssec_keystore_t *store, dnssec_key_t *key);
+
+/*! @} */
diff --git a/src/libdnssec/keystore/internal.h b/src/libdnssec/keystore/internal.h
new file mode 100644
index 0000000..98d85dc
--- /dev/null
+++ b/src/libdnssec/keystore/internal.h
@@ -0,0 +1,50 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gnutls/gnutls.h>
+#include <gnutls/abstract.h>
+
+#include "libdnssec/binary.h"
+#include "libdnssec/key.h"
+#include "libdnssec/keystore.h"
+
+typedef struct keystore_functions {
+ // construction of internal context
+ int (*ctx_new)(void **ctx_ptr);
+ void (*ctx_free)(void *ctx);
+ // keystore init/open/close
+ int (*init)(void *ctx, const char *config);
+ int (*open)(void *ctx, const char *config);
+ int (*close)(void *ctx);
+ // keystore access
+ int (*generate_key)(void *ctx, gnutls_pk_algorithm_t algorithm,
+ unsigned bits, char **id_ptr);
+ int (*import_key)(void *ctx, const dnssec_binary_t *pem, char **id_ptr);
+ int (*remove_key)(void *ctx, const char *id);
+ // private key access
+ int (*get_private)(void *ctx, const char *id, gnutls_privkey_t *key_ptr);
+ int (*set_private)(void *ctx, gnutls_privkey_t key);
+} keystore_functions_t;
+
+struct dnssec_keystore {
+ const keystore_functions_t *functions;
+ void *ctx;
+};
+
+int keystore_create(dnssec_keystore_t **store_ptr,
+ const keystore_functions_t *functions);
diff --git a/src/libdnssec/keystore/keystore.c b/src/libdnssec/keystore/keystore.c
new file mode 100644
index 0000000..e58fdea
--- /dev/null
+++ b/src/libdnssec/keystore/keystore.c
@@ -0,0 +1,186 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "libdnssec/error.h"
+#include "libdnssec/key.h"
+#include "libdnssec/key/algorithm.h"
+#include "libdnssec/key/dnskey.h"
+#include "libdnssec/key/internal.h"
+#include "libdnssec/key/privkey.h"
+#include "libdnssec/keyid.h"
+#include "libdnssec/keystore.h"
+#include "libdnssec/keystore/internal.h"
+#include "libdnssec/shared/shared.h"
+
+/* -- internal API --------------------------------------------------------- */
+
+int keystore_create(dnssec_keystore_t **store_ptr,
+ const keystore_functions_t *functions)
+{
+ assert(store_ptr);
+ assert(functions);
+
+ dnssec_keystore_t *store = calloc(1, sizeof(*store));
+ if (!store) {
+ return DNSSEC_ENOMEM;
+ }
+
+ store->functions = functions;
+
+ int result = functions->ctx_new(&store->ctx);
+ if (result != DNSSEC_EOK) {
+ free(store);
+ return DNSSEC_ENOMEM;
+ }
+
+ *store_ptr = store;
+ return DNSSEC_EOK;
+}
+
+/* -- public API ----------------------------------------------------------- */
+
+_public_
+int dnssec_keystore_deinit(dnssec_keystore_t *store)
+{
+ if (!store) {
+ return DNSSEC_EINVAL;
+ }
+
+ dnssec_keystore_close(store);
+ store->functions->ctx_free(store->ctx);
+
+ free(store);
+
+ return DNSSEC_EOK;
+}
+
+_public_
+int dnssec_keystore_init(dnssec_keystore_t *store, const char *config)
+{
+ if (!store) {
+ return DNSSEC_EINVAL;
+ }
+
+ return store->functions->init(store->ctx, config);
+}
+
+_public_
+int dnssec_keystore_open(dnssec_keystore_t *store, const char *config)
+{
+ if (!store) {
+ return DNSSEC_EINVAL;
+ }
+
+ return store->functions->open(store->ctx, config);
+}
+
+_public_
+int dnssec_keystore_close(dnssec_keystore_t *store)
+{
+ if (!store) {
+ return DNSSEC_EINVAL;
+ }
+
+ return store->functions->close(store->ctx);
+}
+
+_public_
+int dnssec_keystore_generate(dnssec_keystore_t *store,
+ dnssec_key_algorithm_t _algorithm,
+ unsigned bits, char **id_ptr)
+{
+ if (!store || !_algorithm || !id_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ // prepare parameters
+
+ gnutls_pk_algorithm_t algorithm = algorithm_to_gnutls(_algorithm);
+ if (algorithm == GNUTLS_PK_UNKNOWN) {
+ return DNSSEC_INVALID_KEY_ALGORITHM;
+ }
+
+ if (!dnssec_algorithm_key_size_check(_algorithm, bits)) {
+ return DNSSEC_INVALID_KEY_SIZE;
+ }
+
+ return store->functions->generate_key(store->ctx, algorithm, bits, id_ptr);
+}
+
+_public_
+int dnssec_keystore_import(dnssec_keystore_t *store, const dnssec_binary_t *pem,
+ char **id_ptr)
+{
+ if (!store || !pem || !id_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ return store->functions->import_key(store->ctx, pem, id_ptr);
+}
+
+_public_
+int dnssec_keystore_remove(dnssec_keystore_t *store, const char *id)
+{
+ if (!store || !id) {
+ return DNSSEC_EINVAL;
+ }
+
+ return store->functions->remove_key(store->ctx, id);
+}
+
+_public_
+int dnssec_keystore_get_private(dnssec_keystore_t *store, const char *id,
+ dnssec_key_t *key)
+{
+ if (!store || !id || dnssec_key_get_algorithm(key) == 0 || !key) {
+ return DNSSEC_EINVAL;
+ }
+
+ if (key->private_key) {
+ return DNSSEC_KEY_ALREADY_PRESENT;
+ }
+
+ gnutls_privkey_t privkey = NULL;
+ int r = store->functions->get_private(store->ctx, id, &privkey);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ r = key_set_private_key(key, privkey);
+ if (r != DNSSEC_EOK) {
+ gnutls_privkey_deinit(privkey);
+ return r;
+ }
+
+ return DNSSEC_EOK;
+}
+
+_public_
+int dnssec_keystore_set_private(dnssec_keystore_t *store, dnssec_key_t *key)
+{
+ if (!store || !key) {
+ return DNSSEC_EINVAL;
+ }
+
+ if (!key->private_key) {
+ return DNSSEC_NO_PRIVATE_KEY;
+ }
+
+ return store->functions->set_private(store->ctx, key->private_key);
+}
diff --git a/src/libdnssec/keystore/pkcs11.c b/src/libdnssec/keystore/pkcs11.c
new file mode 100644
index 0000000..e3010a8
--- /dev/null
+++ b/src/libdnssec/keystore/pkcs11.c
@@ -0,0 +1,396 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <gnutls/gnutls.h>
+#include <pthread.h>
+
+#include "contrib/string.h"
+#include "libdnssec/error.h"
+#include "libdnssec/keyid.h"
+#include "libdnssec/shared/keyid_gnutls.h"
+#include "libdnssec/keystore.h"
+#include "libdnssec/keystore/internal.h"
+#include "libdnssec/p11/p11.h"
+#include "libdnssec/pem.h"
+#include "libdnssec/shared/shared.h"
+
+#ifdef ENABLE_PKCS11
+
+struct pkcs11_ctx {
+ char *url;
+};
+
+typedef struct pkcs11_ctx pkcs11_ctx_t;
+
+/*!
+ * Flags used when generating/import key into the token.
+ */
+static const int TOKEN_ADD_FLAGS = GNUTLS_PKCS11_OBJ_FLAG_MARK_SENSITIVE
+ | GNUTLS_PKCS11_OBJ_FLAG_MARK_PRIVATE;
+
+static int key_url(const char *token_uri, const char *key_id, char **url_ptr)
+{
+ assert(token_uri);
+ assert(key_id);
+ assert(url_ptr);
+
+ if (!dnssec_keyid_is_valid(key_id)) {
+ return DNSSEC_INVALID_KEY_ID;
+ }
+
+ size_t token_len = strlen(token_uri);
+ size_t id_len = strlen(key_id);
+
+ // url: <token-url>;id=%aa%bb%cc..
+
+ size_t len = token_len + 4 + (id_len / 2 * 3);
+ char *url = malloc(len + 1);
+ if (!url) {
+ return DNSSEC_ENOMEM;
+ }
+
+ size_t prefix = snprintf(url, len, "%s;id=", token_uri);
+ if (prefix != token_len + 4) {
+ free(url);
+ return DNSSEC_ENOMEM;
+ }
+
+ assert(id_len % 2 == 0);
+ char *pos = url + prefix;
+ for (int i = 0; i < id_len; i += 2, pos += 3) {
+ pos[0] = '%';
+ pos[1] = key_id[i];
+ pos[2] = key_id[i+1];
+ }
+ assert(url + len == pos);
+ url[len] = '\0';
+
+ *url_ptr = url;
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Parse configuration string. Accepted format: "<pkcs11-url> <module-path>"
+ */
+static int parse_config(const char *config, char **uri_ptr, char **module_ptr)
+{
+ const char *space = strchr(config, ' ');
+ if (!space) {
+ return DNSSEC_KEYSTORE_INVALID_CONFIG;
+ }
+
+ char *url = strndup(config, space - config);
+ char *module = strdup(space + 1);
+
+ if (!url || !module) {
+ free(url);
+ free(module);
+ return DNSSEC_ENOMEM;
+ }
+
+ *uri_ptr = url;
+ *module_ptr = module;
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Load PKCS #11 module and check if the token is available.
+ */
+static int safe_open(const char *config, char **url_ptr)
+{
+ char *url = NULL;
+ char *module = NULL;
+
+ int r = parse_config(config, &url, &module);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ r = p11_load_module(module);
+ free(module);
+ if (r != GNUTLS_E_SUCCESS) {
+ free(url);
+ return DNSSEC_P11_FAILED_TO_LOAD_MODULE;
+ }
+
+ unsigned int flags = 0;
+ r = gnutls_pkcs11_token_get_flags(url, &flags);
+ if (r != GNUTLS_E_SUCCESS) {
+ free(url);
+ return DNSSEC_P11_TOKEN_NOT_AVAILABLE;
+ }
+
+ *url_ptr = url;
+
+ return DNSSEC_EOK;
+}
+
+/* -- internal API --------------------------------------------------------- */
+
+static void disable_pkcs11_callbacks(void)
+{
+ gnutls_pkcs11_set_pin_function(NULL, NULL);
+ gnutls_pkcs11_set_token_function(NULL, NULL);
+}
+
+static int pkcs11_ctx_new(void **ctx_ptr)
+{
+ static pthread_once_t once = PTHREAD_ONCE_INIT;
+ pthread_once(&once, disable_pkcs11_callbacks);
+
+ pkcs11_ctx_t *ctx = calloc(1, sizeof(*ctx));
+ if (!ctx) {
+ return DNSSEC_ENOMEM;
+ }
+
+ *ctx_ptr = ctx;
+
+ return DNSSEC_EOK;
+}
+
+static void pkcs11_ctx_free(void *ctx)
+{
+ free(ctx);
+}
+
+static int pkcs11_init(void *ctx, const char *config)
+{
+ /*
+ * Current keystore initialization is idempotent. We don't really
+ * initialize the token because don't want to wipe the data. We just
+ * check that the token is available the same way pkcs11_open() does.
+ */
+
+ _cleanup_free_ char *url = NULL;
+
+ return safe_open(config, &url);
+}
+
+static int pkcs11_open(void *_ctx, const char *config)
+{
+ pkcs11_ctx_t *ctx = _ctx;
+
+ return safe_open(config, &ctx->url);
+}
+
+static int pkcs11_close(void *_ctx)
+{
+ pkcs11_ctx_t *ctx = _ctx;
+
+ free(ctx->url);
+ clear_struct(ctx);
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs11_generate_key(void *_ctx, gnutls_pk_algorithm_t algorithm,
+ unsigned bits, char **id_ptr)
+{
+ pkcs11_ctx_t *ctx = _ctx;
+
+ uint8_t buf[20] = { 0 };
+ gnutls_rnd(GNUTLS_RND_RANDOM, buf, sizeof(buf));
+ dnssec_binary_t cka_id = { .data = buf, .size = sizeof(buf) };
+
+ int flags = TOKEN_ADD_FLAGS | GNUTLS_PKCS11_OBJ_FLAG_LOGIN;
+ gnutls_datum_t gt_cka_id = binary_to_datum(&cka_id);
+ int r = gnutls_pkcs11_privkey_generate3(ctx->url, algorithm, bits, NULL, &gt_cka_id, 0, NULL, 0, flags);
+ if (r != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_GENERATE_ERROR;
+ }
+
+ char *id = bin_to_hex(cka_id.data, cka_id.size);
+ if (id == NULL) {
+ return DNSSEC_ENOMEM;
+ }
+
+ *id_ptr = id;
+
+ return DNSSEC_EOK;
+}
+
+static int import_pem(const dnssec_binary_t *pem,
+ gnutls_x509_privkey_t *key_ptr,
+ gnutls_pubkey_t *pubkey_ptr)
+{
+ gnutls_x509_privkey_t x509_key = NULL;
+ gnutls_privkey_t key = NULL;
+ gnutls_pubkey_t pubkey = NULL;
+
+ int r = dnssec_pem_to_x509(pem, &x509_key);
+ if (r != DNSSEC_EOK) {
+ goto fail;
+ }
+
+ if (gnutls_privkey_init(&key) != GNUTLS_E_SUCCESS ||
+ gnutls_pubkey_init(&pubkey) != GNUTLS_E_SUCCESS
+ ) {
+ r = DNSSEC_ENOMEM;
+ goto fail;
+ }
+
+ if (gnutls_privkey_import_x509(key, x509_key, 0) != GNUTLS_E_SUCCESS ||
+ gnutls_pubkey_import_privkey(pubkey, key, 0, 0) != GNUTLS_E_SUCCESS
+ ) {
+ r = DNSSEC_KEY_IMPORT_ERROR;
+ goto fail;
+ }
+
+fail:
+ gnutls_privkey_deinit(key);
+
+ if (r == DNSSEC_EOK) {
+ *key_ptr = x509_key;
+ *pubkey_ptr = pubkey;
+ } else {
+ gnutls_x509_privkey_deinit(x509_key);
+ gnutls_pubkey_deinit(pubkey);
+ }
+
+ return r;
+}
+
+static int pkcs11_import_key(void *_ctx, const dnssec_binary_t *pem, char **id_ptr)
+{
+ pkcs11_ctx_t *ctx = _ctx;
+
+ _cleanup_x509_privkey_ gnutls_x509_privkey_t key = NULL;
+ _cleanup_pubkey_ gnutls_pubkey_t pubkey = NULL;
+
+ int r = import_pem(pem, &key, &pubkey);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ _cleanup_binary_ dnssec_binary_t id = { 0 };
+ r = keyid_x509(key, &id);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ int flags = TOKEN_ADD_FLAGS | GNUTLS_PKCS11_OBJ_FLAG_LOGIN;
+ gnutls_datum_t gid = binary_to_datum(&id);
+
+ r = gnutls_pkcs11_copy_x509_privkey2(ctx->url, key, NULL, &gid, 0, flags);
+ if (r != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_IMPORT_ERROR;
+ }
+
+ r = gnutls_pkcs11_copy_pubkey(ctx->url, pubkey, NULL, &gid, 0, flags);
+ if (r != GNUTLS_E_SUCCESS) {
+ // note, we result with dangling private key in the token
+ return DNSSEC_KEY_IMPORT_ERROR;
+ }
+
+ *id_ptr = bin_to_hex(id.data, id.size);
+ if (*id_ptr == NULL) {
+ return DNSSEC_ENOMEM;
+ }
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs11_remove_key(void *_ctx, const char *id)
+{
+ pkcs11_ctx_t *ctx = _ctx;
+
+ _cleanup_free_ char *url = NULL;
+ int r = key_url(ctx->url, id, &url);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ r = gnutls_pkcs11_delete_url(url, GNUTLS_PKCS11_OBJ_FLAG_LOGIN);
+ if (r < 0) {
+ return DNSSEC_ERROR;
+ } else if (r == 0) {
+ return DNSSEC_ENOENT;
+ }
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs11_get_private(void *_ctx, const char *id, gnutls_privkey_t *key_ptr)
+{
+ pkcs11_ctx_t *ctx = _ctx;
+
+ _cleanup_free_ char *url = NULL;
+ int r = key_url(ctx->url, id, &url);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ gnutls_privkey_t key = NULL;
+ r = gnutls_privkey_init(&key);
+ if (r != GNUTLS_E_SUCCESS) {
+ return DNSSEC_ENOMEM;
+ }
+
+ r = gnutls_privkey_import_pkcs11_url(key, url);
+ if (r != GNUTLS_E_SUCCESS) {
+ gnutls_privkey_deinit(key);
+ return DNSSEC_NOT_FOUND;
+ }
+
+ *key_ptr = key;
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs11_set_private(void *ctx, gnutls_privkey_t key)
+{
+ _cleanup_binary_ dnssec_binary_t pem = { 0 };
+ int r = dnssec_pem_from_privkey(key, &pem);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ _cleanup_free_ char *keyid = NULL;
+
+ return pkcs11_import_key(ctx, &pem, &keyid);
+}
+
+/* -- public API ----------------------------------------------------------- */
+
+_public_
+int dnssec_keystore_init_pkcs11(dnssec_keystore_t **store_ptr)
+{
+ static const keystore_functions_t IMPLEMENTATION = {
+ .ctx_new = pkcs11_ctx_new,
+ .ctx_free = pkcs11_ctx_free,
+ .init = pkcs11_init,
+ .open = pkcs11_open,
+ .close = pkcs11_close,
+ .generate_key = pkcs11_generate_key,
+ .import_key = pkcs11_import_key,
+ .remove_key = pkcs11_remove_key,
+ .get_private = pkcs11_get_private,
+ .set_private = pkcs11_set_private,
+ };
+
+ return keystore_create(store_ptr, &IMPLEMENTATION);
+}
+
+#else // !ENABLE_PKCS11
+
+_public_
+int dnssec_keystore_init_pkcs11(dnssec_keystore_t **store_ptr)
+{
+ return DNSSEC_NOT_IMPLEMENTED_ERROR;
+}
+
+#endif
diff --git a/src/libdnssec/keystore/pkcs8.c b/src/libdnssec/keystore/pkcs8.c
new file mode 100644
index 0000000..36785fe
--- /dev/null
+++ b/src/libdnssec/keystore/pkcs8.c
@@ -0,0 +1,494 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "contrib/files.h"
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/keystore.h"
+#include "libdnssec/keystore/internal.h"
+#include "libdnssec/pem.h"
+#include "libdnssec/shared/shared.h"
+#include "libdnssec/shared/keyid_gnutls.h"
+
+#define DIR_INIT_MODE 0750
+
+/*!
+ * Context for PKCS #8 key directory.
+ */
+typedef struct {
+ char *dir_name;
+} pkcs8_dir_handle_t;
+
+/* -- internal functions --------------------------------------------------- */
+
+/*!
+ * Get path to a private key in PKCS #8 PEM format.
+ */
+static char *key_path(const char *dir, const char *id)
+{
+ char *strp = NULL;
+
+ int ret = asprintf(&strp, "%s/%s.pem", dir, id);
+ if (ret < 0) {
+ return NULL;
+ }
+ return strp;
+}
+
+/*!
+ * Get size of the file and reset the position to the beginning of the file.
+ */
+static int file_size(int fd, size_t *size)
+{
+ off_t offset = lseek(fd, 0, SEEK_END);
+ if (offset == -1) {
+ return dnssec_errno_to_error(errno);
+ }
+
+ if (lseek(fd, 0, SEEK_SET) == -1) {
+ return dnssec_errno_to_error(errno);
+ }
+
+ assert(offset >= 0);
+ *size = offset;
+
+ return DNSSEC_EOK;
+}
+
+/*!
+ * Open a key file and get the descriptor.
+ */
+static int key_open(const char *dir_name, const char *id, int flags,
+ mode_t mode, int *fd_ptr)
+{
+ assert(dir_name);
+ assert(id);
+ assert(fd_ptr);
+
+ _cleanup_free_ char *filename = key_path(dir_name, id);
+ if (!filename) {
+ return DNSSEC_ENOMEM;
+ }
+
+ int fd = open(filename, flags, mode);
+ if (fd == -1) {
+ return dnssec_errno_to_error(errno);
+ }
+
+ *fd_ptr = fd;
+
+ return DNSSEC_EOK;
+}
+
+static int key_open_read(const char *dir_name, const char *id, int *fd_ptr)
+{
+ return key_open(dir_name, id, O_RDONLY, 0, fd_ptr);
+}
+
+static int key_open_write(const char *dir_name, const char *id, int *fd_ptr)
+{
+ return key_open(dir_name, id, O_WRONLY|O_CREAT|O_EXCL,
+ S_IRUSR|S_IWUSR|S_IRGRP, fd_ptr);
+}
+
+static int pkcs8_dir_read(pkcs8_dir_handle_t *handle, const char *id, dnssec_binary_t *pem)
+{
+ if (!handle || !id || !pem) {
+ return DNSSEC_EINVAL;
+ }
+
+ // open file and get it's size
+
+ _cleanup_close_ int file = -1;
+ int result = key_open_read(handle->dir_name, id, &file);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ size_t size = 0;
+ result = file_size(file, &size);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ if (size == 0) {
+ return DNSSEC_MALFORMED_DATA;
+ }
+
+ // read the stored data
+
+ dnssec_binary_t read_pem = { 0 };
+ result = dnssec_binary_alloc(&read_pem, size);
+ if (result != DNSSEC_EOK) {
+ return result;
+ }
+
+ ssize_t read_count = read(file, read_pem.data, read_pem.size);
+ if (read_count == -1) {
+ dnssec_binary_free(&read_pem);
+ return dnssec_errno_to_error(errno);
+ }
+
+ assert(read_count == read_pem.size);
+ *pem = read_pem;
+
+ return DNSSEC_EOK;
+}
+
+static bool key_is_duplicate(int open_error, pkcs8_dir_handle_t *handle,
+ const char *id, const dnssec_binary_t *pem)
+{
+ assert(handle);
+ assert(id);
+ assert(pem);
+
+ if (open_error != dnssec_errno_to_error(EEXIST)) {
+ return false;
+ }
+
+ _cleanup_binary_ dnssec_binary_t old = { 0 };
+ int r = pkcs8_dir_read(handle, id, &old);
+ if (r != DNSSEC_EOK) {
+ return false;
+ }
+
+ return dnssec_binary_cmp(&old, pem) == 0;
+}
+
+static int pem_generate(gnutls_pk_algorithm_t algorithm, unsigned bits,
+ dnssec_binary_t *pem, char **id)
+{
+ assert(pem);
+ assert(id);
+
+ // generate key
+
+ _cleanup_x509_privkey_ gnutls_x509_privkey_t key = NULL;
+ int r = gnutls_x509_privkey_init(&key);
+ if (r != GNUTLS_E_SUCCESS) {
+ return DNSSEC_ENOMEM;
+ }
+
+ r = gnutls_x509_privkey_generate(key, algorithm, bits, 0);
+ if (r != GNUTLS_E_SUCCESS) {
+ return DNSSEC_KEY_GENERATE_ERROR;
+ }
+
+ // convert to PEM and export the ID
+
+ dnssec_binary_t _pem = { 0 };
+ r = dnssec_pem_from_x509(key, &_pem);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ // export key ID
+
+ char *_id = NULL;
+ r = keyid_x509_hex(key, &_id);
+ if (r != DNSSEC_EOK) {
+ dnssec_binary_free(&_pem);
+ return r;
+ }
+
+ *id = _id;
+ *pem = _pem;
+
+ return DNSSEC_EOK;
+}
+
+/* -- internal API --------------------------------------------------------- */
+
+static int pkcs8_ctx_new(void **ctx_ptr)
+{
+ if (!ctx_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ pkcs8_dir_handle_t *ctx = calloc(1, sizeof(*ctx));
+ if (!ctx) {
+ return DNSSEC_ENOMEM;
+ }
+
+ *ctx_ptr = ctx;
+
+ return DNSSEC_EOK;
+}
+
+static void pkcs8_ctx_free(void *ctx)
+{
+ free(ctx);
+}
+
+static int pkcs8_init(void *ctx, const char *config)
+{
+ if (!ctx || !config) {
+ return DNSSEC_EINVAL;
+ }
+
+ return make_dir(config, DIR_INIT_MODE, true);
+}
+
+static int pkcs8_open(void *ctx, const char *config)
+{
+ if (!ctx || !config) {
+ return DNSSEC_EINVAL;
+ }
+
+ pkcs8_dir_handle_t *handle = ctx;
+
+ char *path = realpath(config, NULL);
+ if (!path) {
+ return DNSSEC_NOT_FOUND;
+ }
+
+ handle->dir_name = path;
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs8_close(void *ctx)
+{
+ if (!ctx) {
+ return DNSSEC_EINVAL;
+ }
+
+ pkcs8_dir_handle_t *handle = ctx;
+
+ free(handle->dir_name);
+ memset(handle, 0, sizeof(*handle));
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs8_generate_key(void *ctx, gnutls_pk_algorithm_t algorithm,
+ unsigned bits, char **id_ptr)
+{
+ if (!ctx || !id_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ pkcs8_dir_handle_t *handle = ctx;
+
+ // generate key
+
+ char *id = NULL;
+ _cleanup_binary_ dnssec_binary_t pem = { 0 };
+ int r = pem_generate(algorithm, bits, &pem, &id);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ // create the file
+
+ _cleanup_close_ int file = -1;
+ r = key_open_write(handle->dir_name, id, &file);
+ if (r != DNSSEC_EOK) {
+ if (key_is_duplicate(r, handle, id, &pem)) {
+ return DNSSEC_EOK;
+ }
+ return r;
+ }
+
+ // write the data
+
+ ssize_t wrote_count = write(file, pem.data, pem.size);
+ if (wrote_count == -1) {
+ return dnssec_errno_to_error(errno);
+ }
+
+ assert(wrote_count == pem.size);
+
+ // finish
+
+ *id_ptr = id;
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs8_import_key(void *ctx, const dnssec_binary_t *pem, char **id_ptr)
+{
+ if (!ctx || !pem || !id_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ pkcs8_dir_handle_t *handle = ctx;
+
+ // retrieve key ID
+
+ char *id = NULL;
+ _cleanup_x509_privkey_ gnutls_x509_privkey_t key = NULL;
+ int r = dnssec_pem_to_x509(pem, &key);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ r = keyid_x509_hex(key, &id);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ // create the file
+
+ _cleanup_close_ int file = -1;
+ r = key_open_write(handle->dir_name, id, &file);
+ if (r != DNSSEC_EOK) {
+ if (key_is_duplicate(r, handle, id, pem)) {
+ *id_ptr = id;
+ return DNSSEC_EOK;
+ }
+ return r;
+ }
+
+ // write the data
+
+ ssize_t wrote_count = write(file, pem->data, pem->size);
+ if (wrote_count == -1) {
+ free(id);
+ return dnssec_errno_to_error(errno);
+ }
+
+ assert(wrote_count == pem->size);
+
+ // finish
+
+ *id_ptr = id;
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs8_remove_key(void *ctx, const char *id)
+{
+ if (!ctx || !id) {
+ return DNSSEC_EINVAL;
+ }
+
+ pkcs8_dir_handle_t *handle = ctx;
+
+ _cleanup_free_ char *filename = key_path(handle->dir_name, id);
+ if (!filename) {
+ return DNSSEC_ENOMEM;
+ }
+
+ if (unlink(filename) == -1) {
+ return dnssec_errno_to_error(errno);
+ }
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs8_get_private(void *ctx, const char *id, gnutls_privkey_t *key_ptr)
+{
+ if (!ctx || !id || !key_ptr) {
+ return DNSSEC_EINVAL;
+ }
+
+ pkcs8_dir_handle_t *handle = ctx;
+
+ // load private key data
+
+ _cleanup_close_ int file = -1;
+ int r = key_open_read(handle->dir_name, id, &file);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ size_t size = 0;
+ r = file_size(file, &size);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ if (size == 0) {
+ return DNSSEC_MALFORMED_DATA;
+ }
+
+ // read the stored data
+
+ _cleanup_binary_ dnssec_binary_t pem = { 0 };
+ r = dnssec_binary_alloc(&pem, size);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ ssize_t read_count = read(file, pem.data, pem.size);
+ if (read_count == -1) {
+ dnssec_binary_free(&pem);
+ return dnssec_errno_to_error(errno);
+ }
+
+ assert(read_count == pem.size);
+
+ // construct the key
+
+ gnutls_privkey_t key = NULL;
+ r = dnssec_pem_to_privkey(&pem, &key);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ // finish
+
+ *key_ptr = key;
+
+ return DNSSEC_EOK;
+}
+
+static int pkcs8_set_private(void *ctx, gnutls_privkey_t key)
+{
+ if (!ctx) {
+ return DNSSEC_EINVAL;
+ }
+
+ _cleanup_binary_ dnssec_binary_t pem = { 0 };
+ int r = dnssec_pem_from_privkey(key, &pem);
+ if (r != DNSSEC_EOK) {
+ return r;
+ }
+
+ _cleanup_free_ char *keyid = NULL;
+
+ return pkcs8_import_key(ctx, &pem, &keyid);
+}
+
+/* -- public API ----------------------------------------------------------- */
+
+_public_
+int dnssec_keystore_init_pkcs8(dnssec_keystore_t **store_ptr)
+{
+ static const keystore_functions_t IMPLEMENTATION = {
+ .ctx_new = pkcs8_ctx_new,
+ .ctx_free = pkcs8_ctx_free,
+ .init = pkcs8_init,
+ .open = pkcs8_open,
+ .close = pkcs8_close,
+ .generate_key = pkcs8_generate_key,
+ .import_key = pkcs8_import_key,
+ .remove_key = pkcs8_remove_key,
+ .get_private = pkcs8_get_private,
+ .set_private = pkcs8_set_private,
+ };
+
+ return keystore_create(store_ptr, &IMPLEMENTATION);
+}
diff --git a/src/libdnssec/keytag.h b/src/libdnssec/keytag.h
new file mode 100644
index 0000000..7915970
--- /dev/null
+++ b/src/libdnssec/keytag.h
@@ -0,0 +1,44 @@
+/* Copyright (C) 2020 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 <https://www.gnu.org/licenses/>.
+ */
+
+/*!
+ * \file
+ *
+ * \addtogroup keytag
+ *
+ * \brief Low-level key tag computation API.
+ *
+ * The module provides simple interface for DNSKEY key id computation.
+ *
+ * @{
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <libdnssec/binary.h>
+
+/*!
+ * Compute a key tag for a DNSSEC key.
+ *
+ * \param[in] rdata DNSKEY RDATA.
+ * \param[out] keytag Computed keytag.
+ *
+ * \return Error code, DNSSEC_EOK of successful.
+ */
+int dnssec_keytag(const dnssec_binary_t *rdata, uint16_t *keytag);
+
+/*! @} */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-14 13:01:50 +0000