From f449f278dd3c70e479a035f50a9bb817a9b433ba Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:24:08 +0200 Subject: Adding upstream version 3.2.6. Signed-off-by: Daniel Baumann --- src/libdnssec/key/dnskey.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 src/libdnssec/key/dnskey.c (limited to 'src/libdnssec/key/dnskey.c') diff --git a/src/libdnssec/key/dnskey.c b/src/libdnssec/key/dnskey.c new file mode 100644 index 0000000..6360700 --- /dev/null +++ b/src/libdnssec/key/dnskey.c @@ -0,0 +1,91 @@ +/* Copyright (C) 2022 CZ.NIC, z.s.p.o. + + 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 . + */ + +#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, protocol = 0, flags_hi = 0; + dnssec_binary_t rdata_pubkey = { 0 }; + + wire_ctx_t wire = binary_init(rdata); + + wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_FLAGS); + flags_hi = wire_ctx_read_u8(&wire); + wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PROTOCOL); + protocol = wire_ctx_read_u8(&wire); + if (flags_hi != 0x1 || protocol != 0x3) { + return DNSSEC_INVALID_PUBLIC_KEY; + } + + 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; +} -- cgit v1.2.3