diff options
Diffstat (limited to 'src/libstrongswan/plugins/botan/botan_util_keys.c')
| -rw-r--r-- | src/libstrongswan/plugins/botan/botan_util_keys.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/botan/botan_util_keys.c b/src/libstrongswan/plugins/botan/botan_util_keys.c new file mode 100644 index 000000000..176c2caf9 --- /dev/null +++ b/src/libstrongswan/plugins/botan/botan_util_keys.c @@ -0,0 +1,211 @@ +/* + * Copyright (C) 2018 Tobias Brunner + * HSR Hochschule fuer Technik Rapperswil + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "botan_util_keys.h" +#include "botan_ec_public_key.h" +#include "botan_ec_private_key.h" +#include "botan_rsa_public_key.h" +#include "botan_rsa_private_key.h" + +#include <asn1/asn1.h> +#include <asn1/oid.h> + +/** + * Get the algorithm name of a public key + */ +static char *get_algo_name(botan_pubkey_t pubkey) +{ + char *name; + size_t len = 0; + + if (botan_pubkey_algo_name(pubkey, NULL, &len) + != BOTAN_FFI_ERROR_INSUFFICIENT_BUFFER_SPACE) + { + return NULL; + } + + name = malloc(len); + if (botan_pubkey_algo_name(pubkey, name, &len)) + { + free(name); + return NULL; + } + return name; +} + +/* + * Described in header + */ +public_key_t *botan_public_key_load(key_type_t type, va_list args) +{ + public_key_t *this = NULL; + botan_pubkey_t pubkey; + chunk_t blob = chunk_empty; + botan_rng_t rng; + char *name; + + while (TRUE) + { + switch (va_arg(args, builder_part_t)) + { + case BUILD_BLOB_ASN1_DER: + blob = va_arg(args, chunk_t); + continue; + case BUILD_END: + break; + default: + return NULL; + } + break; + } + + if (botan_rng_init(&rng, "user")) + { + return NULL; + } + if (botan_pubkey_load(&pubkey, blob.ptr, blob.len)) + { + botan_rng_destroy(rng); + return NULL; + } + if (botan_pubkey_check_key(pubkey, rng, BOTAN_CHECK_KEY_EXPENSIVE_TESTS)) + { + DBG1(DBG_LIB, "public key failed key checks"); + botan_pubkey_destroy(pubkey); + botan_rng_destroy(rng); + return NULL; + } + botan_rng_destroy(rng); + + name = get_algo_name(pubkey); + if (!name) + { + botan_pubkey_destroy(pubkey); + return NULL; + } + + if (streq(name, "RSA") && (type == KEY_ANY || type == KEY_RSA)) + { + this = (public_key_t*)botan_rsa_public_key_adopt(pubkey); + } + else if (streq(name, "ECDSA") && (type == KEY_ANY || type == KEY_ECDSA)) + { + this = (public_key_t*)botan_ec_public_key_adopt(pubkey); + } + else + { + botan_pubkey_destroy(pubkey); + } + free(name); + return this; +} + +/** + * Determine the curve OID from a PKCS#8 structure + */ +static int determine_ec_oid(chunk_t pkcs8) +{ + int oid = OID_UNKNOWN; + chunk_t inner, params = chunk_empty; + + if (asn1_unwrap(&pkcs8, &pkcs8) == ASN1_SEQUENCE && + asn1_unwrap(&pkcs8, &inner) == ASN1_INTEGER && + asn1_parse_integer_uint64(inner) == 0 && + asn1_parse_algorithmIdentifier(pkcs8, 0, ¶ms) == OID_EC_PUBLICKEY && + params.len && + asn1_unwrap(¶ms, ¶ms) == ASN1_OID) + { + oid = asn1_known_oid(params); + } + return oid; +} + +/* + * Described in header + */ +private_key_t *botan_private_key_load(key_type_t type, va_list args) +{ + private_key_t *this = NULL; + botan_privkey_t key; + botan_pubkey_t pubkey; + chunk_t blob = chunk_empty; + botan_rng_t rng; + char *name; + int oid; + + while (TRUE) + { + switch (va_arg(args, builder_part_t)) + { + case BUILD_BLOB_ASN1_DER: + blob = va_arg(args, chunk_t); + continue; + case BUILD_END: + break; + default: + return NULL; + } + break; + } + + if (botan_rng_init(&rng, "user")) + { + return NULL; + } + if (botan_privkey_load(&key, rng, blob.ptr, blob.len, NULL)) + { + botan_rng_destroy(rng); + return NULL; + } + botan_rng_destroy(rng); + + if (botan_privkey_export_pubkey(&pubkey, key)) + { + botan_privkey_destroy(key); + return NULL; + } + name = get_algo_name(pubkey); + botan_pubkey_destroy(pubkey); + if (!name) + { + return NULL; + } + if (streq(name, "RSA") && (type == KEY_ANY || type == KEY_RSA)) + { + this = (private_key_t*)botan_rsa_private_key_adopt(key); + } + else if (streq(name, "ECDSA") && (type == KEY_ANY || type == KEY_ECDSA)) + { + oid = determine_ec_oid(blob); + if (oid != OID_UNKNOWN) + { + this = (private_key_t*)botan_ec_private_key_adopt(key, oid); + } + } + if (!this) + { + botan_privkey_destroy(key); + } + free(name); + return this; +} |