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/privkey.c | 140 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 src/libdnssec/key/privkey.c (limited to 'src/libdnssec/key/privkey.c') 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. + + 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 +#include + +#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; +} -- cgit v1.2.3