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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 00:53:35 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 00:53:35 +0000 |
commit | 69c6a41ffb878ef98c9378ed4b1634a404cfaa7f (patch) | |
tree | b2a4f704565d62fbb129ab9dc3b35977c50e6e7f /src/libdnssec/key/key.c | |
parent | Initial commit. (diff) | |
download | knot-upstream/2.7.6.tar.xz knot-upstream/2.7.6.zip |
Adding upstream version 2.7.6.upstream/2.7.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/libdnssec/key/key.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/src/libdnssec/key/key.c b/src/libdnssec/key/key.c new file mode 100644 index 0000000..6f24f87 --- /dev/null +++ b/src/libdnssec/key/key.c @@ -0,0 +1,440 @@ +/* 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 <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/pem.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; +} |