234 lines
7.8 KiB
C
234 lines
7.8 KiB
C
/*-
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* Copyright 2007-2021 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright Nokia 2007-2019
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* Copyright Siemens AG 2015-2019
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*
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* CRMF implementation by Martin Peylo, Miikka Viljanen, and David von Oheimb.
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*/
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#include <string.h>
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#include <openssl/rand.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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/* explicit #includes not strictly needed since implied by the above: */
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#include <openssl/asn1t.h>
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#include <openssl/crmf.h>
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#include <openssl/err.h>
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#include <openssl/params.h>
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#include <openssl/core_names.h>
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#include "internal/sizes.h"
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#include "crmf_local.h"
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/*-
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* creates and initializes OSSL_CRMF_PBMPARAMETER (section 4.4)
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* |slen| SHOULD be at least 8 (16 is common)
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* |owfnid| e.g., NID_sha256
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* |itercnt| MUST be >= 100 (e.g., 500) and <= OSSL_CRMF_PBM_MAX_ITERATION_COUNT
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* |macnid| e.g., NID_hmac_sha1
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* returns pointer to OSSL_CRMF_PBMPARAMETER on success, NULL on error
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*/
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OSSL_CRMF_PBMPARAMETER *OSSL_CRMF_pbmp_new(OSSL_LIB_CTX *libctx, size_t slen,
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int owfnid, size_t itercnt,
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int macnid)
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{
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OSSL_CRMF_PBMPARAMETER *pbm = NULL;
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unsigned char *salt = NULL;
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if ((pbm = OSSL_CRMF_PBMPARAMETER_new()) == NULL)
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goto err;
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/*
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* salt contains a randomly generated value used in computing the key
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* of the MAC process. The salt SHOULD be at least 8 octets (64
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* bits) long.
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*/
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if ((salt = OPENSSL_malloc(slen)) == NULL)
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goto err;
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if (RAND_bytes_ex(libctx, salt, slen, 0) <= 0) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_FAILURE_OBTAINING_RANDOM);
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goto err;
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}
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if (!ASN1_OCTET_STRING_set(pbm->salt, salt, (int)slen))
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goto err;
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/*
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* owf identifies the hash algorithm and associated parameters used to
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* compute the key used in the MAC process. All implementations MUST
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* support SHA-1.
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*/
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if (!X509_ALGOR_set0(pbm->owf, OBJ_nid2obj(owfnid), V_ASN1_UNDEF, NULL)) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_SETTING_OWF_ALGOR_FAILURE);
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goto err;
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}
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/*
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* iterationCount identifies the number of times the hash is applied
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* during the key computation process. The iterationCount MUST be a
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* minimum of 100. Many people suggest using values as high as 1000
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* iterations as the minimum value. The trade off here is between
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* protection of the password from attacks and the time spent by the
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* server processing all of the different iterations in deriving
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* passwords. Hashing is generally considered a cheap operation but
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* this may not be true with all hash functions in the future.
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*/
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if (itercnt < 100) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_ITERATIONCOUNT_BELOW_100);
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goto err;
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}
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if (itercnt > OSSL_CRMF_PBM_MAX_ITERATION_COUNT) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_BAD_PBM_ITERATIONCOUNT);
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goto err;
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}
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if (!ASN1_INTEGER_set(pbm->iterationCount, itercnt)) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_CRMFERROR);
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goto err;
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}
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/*
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* mac identifies the algorithm and associated parameters of the MAC
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* function to be used. All implementations MUST support HMAC-SHA1 [HMAC].
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* All implementations SHOULD support DES-MAC and Triple-DES-MAC [PKCS11].
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*/
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if (!X509_ALGOR_set0(pbm->mac, OBJ_nid2obj(macnid), V_ASN1_UNDEF, NULL)) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_SETTING_MAC_ALGOR_FAILURE);
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goto err;
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}
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OPENSSL_free(salt);
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return pbm;
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err:
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OPENSSL_free(salt);
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OSSL_CRMF_PBMPARAMETER_free(pbm);
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return NULL;
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}
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/*-
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* calculates the PBM based on the settings of the given OSSL_CRMF_PBMPARAMETER
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* |pbmp| identifies the algorithms, salt to use
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* |msg| message to apply the PBM for
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* |msglen| length of the message
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* |sec| key to use
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* |seclen| length of the key
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* |out| pointer to the computed mac, will be set on success
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* |outlen| if not NULL, will set variable to the length of the mac on success
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* returns 1 on success, 0 on error
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*/
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/* could be combined with other MAC calculations in the library */
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int OSSL_CRMF_pbm_new(OSSL_LIB_CTX *libctx, const char *propq,
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const OSSL_CRMF_PBMPARAMETER *pbmp,
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const unsigned char *msg, size_t msglen,
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const unsigned char *sec, size_t seclen,
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unsigned char **out, size_t *outlen)
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{
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int mac_nid, hmac_md_nid = NID_undef;
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char mdname[OSSL_MAX_NAME_SIZE];
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char hmac_mdname[OSSL_MAX_NAME_SIZE];
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EVP_MD *owf = NULL;
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EVP_MD_CTX *ctx = NULL;
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unsigned char basekey[EVP_MAX_MD_SIZE];
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unsigned int bklen = EVP_MAX_MD_SIZE;
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int64_t iterations;
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unsigned char *mac_res = 0;
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int ok = 0;
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if (out == NULL || pbmp == NULL || pbmp->mac == NULL
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|| pbmp->mac->algorithm == NULL || msg == NULL || sec == NULL) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
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goto err;
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}
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if ((mac_res = OPENSSL_malloc(EVP_MAX_MD_SIZE)) == NULL)
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goto err;
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/*
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* owf identifies the hash algorithm and associated parameters used to
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* compute the key used in the MAC process. All implementations MUST
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* support SHA-1.
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*/
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OBJ_obj2txt(mdname, sizeof(mdname), pbmp->owf->algorithm, 0);
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if ((owf = EVP_MD_fetch(libctx, mdname, propq)) == NULL) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_UNSUPPORTED_ALGORITHM);
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goto err;
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}
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if ((ctx = EVP_MD_CTX_new()) == NULL)
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goto err;
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/* compute the basekey of the salted secret */
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if (!EVP_DigestInit_ex(ctx, owf, NULL))
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goto err;
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/* first the secret */
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if (!EVP_DigestUpdate(ctx, sec, seclen))
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goto err;
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/* then the salt */
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if (!EVP_DigestUpdate(ctx, pbmp->salt->data, pbmp->salt->length))
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goto err;
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if (!EVP_DigestFinal_ex(ctx, basekey, &bklen))
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goto err;
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if (!ASN1_INTEGER_get_int64(&iterations, pbmp->iterationCount)
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|| iterations < 100 /* min from RFC */
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|| iterations > OSSL_CRMF_PBM_MAX_ITERATION_COUNT) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_BAD_PBM_ITERATIONCOUNT);
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goto err;
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}
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/* the first iteration was already done above */
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while (--iterations > 0) {
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if (!EVP_DigestInit_ex(ctx, owf, NULL))
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goto err;
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if (!EVP_DigestUpdate(ctx, basekey, bklen))
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goto err;
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if (!EVP_DigestFinal_ex(ctx, basekey, &bklen))
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goto err;
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}
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/*
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* mac identifies the algorithm and associated parameters of the MAC
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* function to be used. All implementations MUST support HMAC-SHA1 [HMAC].
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* All implementations SHOULD support DES-MAC and Triple-DES-MAC [PKCS11].
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*/
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mac_nid = OBJ_obj2nid(pbmp->mac->algorithm);
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if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, mac_nid, NULL, &hmac_md_nid, NULL)
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|| OBJ_obj2txt(hmac_mdname, sizeof(hmac_mdname),
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OBJ_nid2obj(hmac_md_nid), 0) <= 0) {
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ERR_raise(ERR_LIB_CRMF, CRMF_R_UNSUPPORTED_ALGORITHM);
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goto err;
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}
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/* could be generalized to allow non-HMAC: */
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if (EVP_Q_mac(libctx, "HMAC", propq, hmac_mdname, NULL, basekey, bklen,
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msg, msglen, mac_res, EVP_MAX_MD_SIZE, outlen) == NULL)
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goto err;
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ok = 1;
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err:
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OPENSSL_cleanse(basekey, bklen);
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EVP_MD_free(owf);
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EVP_MD_CTX_free(ctx);
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if (ok == 1) {
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*out = mac_res;
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return 1;
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}
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OPENSSL_free(mac_res);
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if (pbmp != NULL && pbmp->mac != NULL) {
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char buf[128];
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if (OBJ_obj2txt(buf, sizeof(buf), pbmp->mac->algorithm, 0))
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ERR_add_error_data(1, buf);
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}
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return 0;
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}
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