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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:24:08 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:24:08 +0000 |
commit | f449f278dd3c70e479a035f50a9bb817a9b433ba (patch) | |
tree | 8ca2bfb785dda9bb4d573acdf9b42aea9cd51383 /src/libdnssec/key/ds.c | |
parent | Initial commit. (diff) | |
download | knot-upstream/3.2.6.tar.xz knot-upstream/3.2.6.zip |
Adding upstream version 3.2.6.upstream/3.2.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/libdnssec/key/ds.c | 128 |
1 files changed, 128 insertions, 0 deletions
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; +} |