/
val_secalgo.c
1914 lines (1796 loc) · 49 KB
/
val_secalgo.c
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/*
* validator/val_secalgo.c - validator security algorithm functions.
*
* Copyright (c) 2012, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains helper functions for the validator module.
* These functions take raw data buffers, formatted for crypto verification,
* and do the library calls (for the crypto library in use).
*/
#include "config.h"
/* packed_rrset on top to define enum types (forced by c99 standard) */
#include "util/data/packed_rrset.h"
#include "validator/val_secalgo.h"
#include "validator/val_nsec3.h"
#include "util/log.h"
#include "sldns/rrdef.h"
#include "sldns/keyraw.h"
#include "sldns/sbuffer.h"
#if !defined(HAVE_SSL) && !defined(HAVE_NSS) && !defined(HAVE_NETTLE)
#error "Need crypto library to do digital signature cryptography"
#endif
/* OpenSSL implementation */
#if defined(HAVE_SSL) && !defined(HAVE_NETTLE)
#ifdef HAVE_OPENSSL_ERR_H
#include <openssl/err.h>
#endif
#ifdef HAVE_OPENSSL_RAND_H
#include <openssl/rand.h>
#endif
#ifdef HAVE_OPENSSL_CONF_H
#include <openssl/conf.h>
#endif
#ifdef HAVE_OPENSSL_ENGINE_H
#include <openssl/engine.h>
#endif
/** fake DSA support for unit tests */
int fake_dsa = 0;
/** fake SHA1 support for unit tests */
int fake_sha1 = 0;
/**
* Output a libcrypto openssl error to the logfile.
* @param str: string to add to it.
* @param e: the error to output, error number from ERR_get_error().
*/
static void
log_crypto_error(const char* str, unsigned long e)
{
char buf[128];
/* or use ERR_error_string if ERR_error_string_n is not avail TODO */
ERR_error_string_n(e, buf, sizeof(buf));
/* buf now contains */
/* error:[error code]:[library name]:[function name]:[reason string] */
log_err("%s crypto %s", str, buf);
(void) str; /* In case log_err() does nothing. */
}
/* return size of digest if supported, or 0 otherwise */
size_t
nsec3_hash_algo_size_supported(int id)
{
switch(id) {
case NSEC3_HASH_SHA1:
return SHA_DIGEST_LENGTH;
default:
return 0;
}
}
/* perform nsec3 hash. return false on failure */
int
secalgo_nsec3_hash(int algo, unsigned char* buf, size_t len,
unsigned char* res)
{
switch(algo) {
case NSEC3_HASH_SHA1:
#ifdef OPENSSL_FIPS
if(!sldns_digest_evp(buf, len, res, EVP_sha1()))
log_crypto_error("could not digest with EVP_sha1",
ERR_get_error());
#else
(void)SHA1(buf, len, res);
#endif
return 1;
default:
return 0;
}
}
void
secalgo_hash_sha256(unsigned char* buf, size_t len, unsigned char* res)
{
#ifdef OPENSSL_FIPS
if(!sldns_digest_evp(buf, len, res, EVP_sha256()))
log_crypto_error("could not digest with EVP_sha256",
ERR_get_error());
#else
(void)SHA256(buf, len, res);
#endif
}
/**
* Return size of DS digest according to its hash algorithm.
* @param algo: DS digest algo.
* @return size in bytes of digest, or 0 if not supported.
*/
size_t
ds_digest_size_supported(int algo)
{
switch(algo) {
case LDNS_SHA1:
#if defined(HAVE_EVP_SHA1) && defined(USE_SHA1)
return SHA_DIGEST_LENGTH;
#else
if(fake_sha1) return 20;
return 0;
#endif
#ifdef HAVE_EVP_SHA256
case LDNS_SHA256:
return SHA256_DIGEST_LENGTH;
#endif
#ifdef USE_GOST
case LDNS_HASH_GOST:
/* we support GOST if it can be loaded */
(void)sldns_key_EVP_load_gost_id();
if(EVP_get_digestbyname("md_gost94"))
return 32;
else return 0;
#endif
#ifdef USE_ECDSA
case LDNS_SHA384:
return SHA384_DIGEST_LENGTH;
#endif
default: break;
}
return 0;
}
#ifdef USE_GOST
/** Perform GOST hash */
static int
do_gost94(unsigned char* data, size_t len, unsigned char* dest)
{
const EVP_MD* md = EVP_get_digestbyname("md_gost94");
if(!md)
return 0;
return sldns_digest_evp(data, (unsigned int)len, dest, md);
}
#endif
int
secalgo_ds_digest(int algo, unsigned char* buf, size_t len,
unsigned char* res)
{
switch(algo) {
#if defined(HAVE_EVP_SHA1) && defined(USE_SHA1)
case LDNS_SHA1:
#ifdef OPENSSL_FIPS
if(!sldns_digest_evp(buf, len, res, EVP_sha1()))
log_crypto_error("could not digest with EVP_sha1",
ERR_get_error());
#else
(void)SHA1(buf, len, res);
#endif
return 1;
#endif
#ifdef HAVE_EVP_SHA256
case LDNS_SHA256:
#ifdef OPENSSL_FIPS
if(!sldns_digest_evp(buf, len, res, EVP_sha256()))
log_crypto_error("could not digest with EVP_sha256",
ERR_get_error());
#else
(void)SHA256(buf, len, res);
#endif
return 1;
#endif
#ifdef USE_GOST
case LDNS_HASH_GOST:
if(do_gost94(buf, len, res))
return 1;
break;
#endif
#ifdef USE_ECDSA
case LDNS_SHA384:
#ifdef OPENSSL_FIPS
if(!sldns_digest_evp(buf, len, res, EVP_sha384()))
log_crypto_error("could not digest with EVP_sha384",
ERR_get_error());
#else
(void)SHA384(buf, len, res);
#endif
return 1;
#endif
default:
verbose(VERB_QUERY, "unknown DS digest algorithm %d",
algo);
break;
}
return 0;
}
/** return true if DNSKEY algorithm id is supported */
int
dnskey_algo_id_is_supported(int id)
{
switch(id) {
case LDNS_RSAMD5:
/* RFC 6725 deprecates RSAMD5 */
return 0;
case LDNS_DSA:
case LDNS_DSA_NSEC3:
#if defined(USE_DSA) && defined(USE_SHA1)
return 1;
#else
if(fake_dsa || fake_sha1) return 1;
return 0;
#endif
case LDNS_RSASHA1:
case LDNS_RSASHA1_NSEC3:
#ifdef USE_SHA1
return 1;
#else
if(fake_sha1) return 1;
return 0;
#endif
#if defined(HAVE_EVP_SHA256) && defined(USE_SHA2)
case LDNS_RSASHA256:
#endif
#if defined(HAVE_EVP_SHA512) && defined(USE_SHA2)
case LDNS_RSASHA512:
#endif
#ifdef USE_ECDSA
case LDNS_ECDSAP256SHA256:
case LDNS_ECDSAP384SHA384:
#endif
#ifdef USE_ED25519
case LDNS_ED25519:
#endif
#ifdef USE_ED448
case LDNS_ED448:
#endif
#if (defined(HAVE_EVP_SHA256) && defined(USE_SHA2)) || (defined(HAVE_EVP_SHA512) && defined(USE_SHA2)) || defined(USE_ECDSA) || defined(USE_ED25519) || defined(USE_ED448)
return 1;
#endif
#ifdef USE_GOST
case LDNS_ECC_GOST:
/* we support GOST if it can be loaded */
return sldns_key_EVP_load_gost_id();
#endif
default:
return 0;
}
}
#ifdef USE_DSA
/**
* Setup DSA key digest in DER encoding ...
* @param sig: input is signature output alloced ptr (unless failure).
* caller must free alloced ptr if this routine returns true.
* @param len: input is initial siglen, output is output len.
* @return false on failure.
*/
static int
setup_dsa_sig(unsigned char** sig, unsigned int* len)
{
unsigned char* orig = *sig;
unsigned int origlen = *len;
int newlen;
BIGNUM *R, *S;
DSA_SIG *dsasig;
/* extract the R and S field from the sig buffer */
if(origlen < 1 + 2*SHA_DIGEST_LENGTH)
return 0;
R = BN_new();
if(!R) return 0;
(void) BN_bin2bn(orig + 1, SHA_DIGEST_LENGTH, R);
S = BN_new();
if(!S) return 0;
(void) BN_bin2bn(orig + 21, SHA_DIGEST_LENGTH, S);
dsasig = DSA_SIG_new();
if(!dsasig) return 0;
#ifdef HAVE_DSA_SIG_SET0
if(!DSA_SIG_set0(dsasig, R, S)) return 0;
#else
# ifndef S_SPLINT_S
dsasig->r = R;
dsasig->s = S;
# endif /* S_SPLINT_S */
#endif
*sig = NULL;
newlen = i2d_DSA_SIG(dsasig, sig);
if(newlen < 0) {
DSA_SIG_free(dsasig);
free(*sig);
return 0;
}
*len = (unsigned int)newlen;
DSA_SIG_free(dsasig);
return 1;
}
#endif /* USE_DSA */
#ifdef USE_ECDSA
/**
* Setup the ECDSA signature in its encoding that the library wants.
* Converts from plain numbers to ASN formatted.
* @param sig: input is signature, output alloced ptr (unless failure).
* caller must free alloced ptr if this routine returns true.
* @param len: input is initial siglen, output is output len.
* @return false on failure.
*/
static int
setup_ecdsa_sig(unsigned char** sig, unsigned int* len)
{
/* convert from two BIGNUMs in the rdata buffer, to ASN notation.
* ASN preamble: 30440220 <R 32bytefor256> 0220 <S 32bytefor256>
* the '20' is the length of that field (=bnsize).
i * the '44' is the total remaining length.
* if negative, start with leading zero.
* if starts with 00s, remove them from the number.
*/
uint8_t pre[] = {0x30, 0x44, 0x02, 0x20};
int pre_len = 4;
uint8_t mid[] = {0x02, 0x20};
int mid_len = 2;
int raw_sig_len, r_high, s_high, r_rem=0, s_rem=0;
int bnsize = (int)((*len)/2);
unsigned char* d = *sig;
uint8_t* p;
/* if too short or not even length, fails */
if(*len < 16 || bnsize*2 != (int)*len)
return 0;
/* strip leading zeroes from r (but not last one) */
while(r_rem < bnsize-1 && d[r_rem] == 0)
r_rem++;
/* strip leading zeroes from s (but not last one) */
while(s_rem < bnsize-1 && d[bnsize+s_rem] == 0)
s_rem++;
r_high = ((d[0+r_rem]&0x80)?1:0);
s_high = ((d[bnsize+s_rem]&0x80)?1:0);
raw_sig_len = pre_len + r_high + bnsize - r_rem + mid_len +
s_high + bnsize - s_rem;
*sig = (unsigned char*)malloc((size_t)raw_sig_len);
if(!*sig)
return 0;
p = (uint8_t*)*sig;
p[0] = pre[0];
p[1] = (uint8_t)(raw_sig_len-2);
p[2] = pre[2];
p[3] = (uint8_t)(bnsize + r_high - r_rem);
p += 4;
if(r_high) {
*p = 0;
p += 1;
}
memmove(p, d+r_rem, (size_t)bnsize-r_rem);
p += bnsize-r_rem;
memmove(p, mid, (size_t)mid_len-1);
p += mid_len-1;
*p = (uint8_t)(bnsize + s_high - s_rem);
p += 1;
if(s_high) {
*p = 0;
p += 1;
}
memmove(p, d+bnsize+s_rem, (size_t)bnsize-s_rem);
*len = (unsigned int)raw_sig_len;
return 1;
}
#endif /* USE_ECDSA */
#ifdef USE_ECDSA_EVP_WORKAROUND
static EVP_MD ecdsa_evp_256_md;
static EVP_MD ecdsa_evp_384_md;
void ecdsa_evp_workaround_init(void)
{
/* openssl before 1.0.0 fixes RSA with the SHA256
* hash in EVP. We create one for ecdsa_sha256 */
ecdsa_evp_256_md = *EVP_sha256();
ecdsa_evp_256_md.required_pkey_type[0] = EVP_PKEY_EC;
ecdsa_evp_256_md.verify = (void*)ECDSA_verify;
ecdsa_evp_384_md = *EVP_sha384();
ecdsa_evp_384_md.required_pkey_type[0] = EVP_PKEY_EC;
ecdsa_evp_384_md.verify = (void*)ECDSA_verify;
}
#endif /* USE_ECDSA_EVP_WORKAROUND */
/**
* Setup key and digest for verification. Adjust sig if necessary.
*
* @param algo: key algorithm
* @param evp_key: EVP PKEY public key to create.
* @param digest_type: digest type to use
* @param key: key to setup for.
* @param keylen: length of key.
* @return false on failure.
*/
static int
setup_key_digest(int algo, EVP_PKEY** evp_key, const EVP_MD** digest_type,
unsigned char* key, size_t keylen)
{
#if defined(USE_DSA) && defined(USE_SHA1)
DSA* dsa;
#endif
RSA* rsa;
switch(algo) {
#if defined(USE_DSA) && defined(USE_SHA1)
case LDNS_DSA:
case LDNS_DSA_NSEC3:
*evp_key = EVP_PKEY_new();
if(!*evp_key) {
log_err("verify: malloc failure in crypto");
return 0;
}
dsa = sldns_key_buf2dsa_raw(key, keylen);
if(!dsa) {
verbose(VERB_QUERY, "verify: "
"sldns_key_buf2dsa_raw failed");
return 0;
}
if(EVP_PKEY_assign_DSA(*evp_key, dsa) == 0) {
verbose(VERB_QUERY, "verify: "
"EVP_PKEY_assign_DSA failed");
return 0;
}
#ifdef HAVE_EVP_DSS1
*digest_type = EVP_dss1();
#else
*digest_type = EVP_sha1();
#endif
break;
#endif /* USE_DSA && USE_SHA1 */
#if defined(USE_SHA1) || (defined(HAVE_EVP_SHA256) && defined(USE_SHA2)) || (defined(HAVE_EVP_SHA512) && defined(USE_SHA2))
#ifdef USE_SHA1
case LDNS_RSASHA1:
case LDNS_RSASHA1_NSEC3:
#endif
#if defined(HAVE_EVP_SHA256) && defined(USE_SHA2)
case LDNS_RSASHA256:
#endif
#if defined(HAVE_EVP_SHA512) && defined(USE_SHA2)
case LDNS_RSASHA512:
#endif
*evp_key = EVP_PKEY_new();
if(!*evp_key) {
log_err("verify: malloc failure in crypto");
return 0;
}
rsa = sldns_key_buf2rsa_raw(key, keylen);
if(!rsa) {
verbose(VERB_QUERY, "verify: "
"sldns_key_buf2rsa_raw SHA failed");
return 0;
}
if(EVP_PKEY_assign_RSA(*evp_key, rsa) == 0) {
verbose(VERB_QUERY, "verify: "
"EVP_PKEY_assign_RSA SHA failed");
return 0;
}
/* select SHA version */
#if defined(HAVE_EVP_SHA256) && defined(USE_SHA2)
if(algo == LDNS_RSASHA256)
*digest_type = EVP_sha256();
else
#endif
#if defined(HAVE_EVP_SHA512) && defined(USE_SHA2)
if(algo == LDNS_RSASHA512)
*digest_type = EVP_sha512();
else
#endif
#ifdef USE_SHA1
*digest_type = EVP_sha1();
#else
{ verbose(VERB_QUERY, "no digest available"); return 0; }
#endif
break;
#endif /* defined(USE_SHA1) || (defined(HAVE_EVP_SHA256) && defined(USE_SHA2)) || (defined(HAVE_EVP_SHA512) && defined(USE_SHA2)) */
case LDNS_RSAMD5:
*evp_key = EVP_PKEY_new();
if(!*evp_key) {
log_err("verify: malloc failure in crypto");
return 0;
}
rsa = sldns_key_buf2rsa_raw(key, keylen);
if(!rsa) {
verbose(VERB_QUERY, "verify: "
"sldns_key_buf2rsa_raw MD5 failed");
return 0;
}
if(EVP_PKEY_assign_RSA(*evp_key, rsa) == 0) {
verbose(VERB_QUERY, "verify: "
"EVP_PKEY_assign_RSA MD5 failed");
return 0;
}
*digest_type = EVP_md5();
break;
#ifdef USE_GOST
case LDNS_ECC_GOST:
*evp_key = sldns_gost2pkey_raw(key, keylen);
if(!*evp_key) {
verbose(VERB_QUERY, "verify: "
"sldns_gost2pkey_raw failed");
return 0;
}
*digest_type = EVP_get_digestbyname("md_gost94");
if(!*digest_type) {
verbose(VERB_QUERY, "verify: "
"EVP_getdigest md_gost94 failed");
return 0;
}
break;
#endif
#ifdef USE_ECDSA
case LDNS_ECDSAP256SHA256:
*evp_key = sldns_ecdsa2pkey_raw(key, keylen,
LDNS_ECDSAP256SHA256);
if(!*evp_key) {
verbose(VERB_QUERY, "verify: "
"sldns_ecdsa2pkey_raw failed");
return 0;
}
#ifdef USE_ECDSA_EVP_WORKAROUND
*digest_type = &ecdsa_evp_256_md;
#else
*digest_type = EVP_sha256();
#endif
break;
case LDNS_ECDSAP384SHA384:
*evp_key = sldns_ecdsa2pkey_raw(key, keylen,
LDNS_ECDSAP384SHA384);
if(!*evp_key) {
verbose(VERB_QUERY, "verify: "
"sldns_ecdsa2pkey_raw failed");
return 0;
}
#ifdef USE_ECDSA_EVP_WORKAROUND
*digest_type = &ecdsa_evp_384_md;
#else
*digest_type = EVP_sha384();
#endif
break;
#endif /* USE_ECDSA */
#ifdef USE_ED25519
case LDNS_ED25519:
*evp_key = sldns_ed255192pkey_raw(key, keylen);
if(!*evp_key) {
verbose(VERB_QUERY, "verify: "
"sldns_ed255192pkey_raw failed");
return 0;
}
*digest_type = NULL;
break;
#endif /* USE_ED25519 */
#ifdef USE_ED448
case LDNS_ED448:
*evp_key = sldns_ed4482pkey_raw(key, keylen);
if(!*evp_key) {
verbose(VERB_QUERY, "verify: "
"sldns_ed4482pkey_raw failed");
return 0;
}
*digest_type = NULL;
break;
#endif /* USE_ED448 */
default:
verbose(VERB_QUERY, "verify: unknown algorithm %d",
algo);
return 0;
}
return 1;
}
/**
* Check a canonical sig+rrset and signature against a dnskey
* @param buf: buffer with data to verify, the first rrsig part and the
* canonicalized rrset.
* @param algo: DNSKEY algorithm.
* @param sigblock: signature rdata field from RRSIG
* @param sigblock_len: length of sigblock data.
* @param key: public key data from DNSKEY RR.
* @param keylen: length of keydata.
* @param reason: bogus reason in more detail.
* @return secure if verification succeeded, bogus on crypto failure,
* unchecked on format errors and alloc failures.
*/
enum sec_status
verify_canonrrset(sldns_buffer* buf, int algo, unsigned char* sigblock,
unsigned int sigblock_len, unsigned char* key, unsigned int keylen,
char** reason)
{
const EVP_MD *digest_type;
EVP_MD_CTX* ctx;
int res, dofree = 0, docrypto_free = 0;
EVP_PKEY *evp_key = NULL;
#ifndef USE_DSA
if((algo == LDNS_DSA || algo == LDNS_DSA_NSEC3) &&(fake_dsa||fake_sha1))
return sec_status_secure;
#endif
#ifndef USE_SHA1
if(fake_sha1 && (algo == LDNS_DSA || algo == LDNS_DSA_NSEC3 || algo == LDNS_RSASHA1 || algo == LDNS_RSASHA1_NSEC3))
return sec_status_secure;
#endif
if(!setup_key_digest(algo, &evp_key, &digest_type, key, keylen)) {
verbose(VERB_QUERY, "verify: failed to setup key");
*reason = "use of key for crypto failed";
EVP_PKEY_free(evp_key);
return sec_status_bogus;
}
#ifdef USE_DSA
/* if it is a DSA signature in bind format, convert to DER format */
if((algo == LDNS_DSA || algo == LDNS_DSA_NSEC3) &&
sigblock_len == 1+2*SHA_DIGEST_LENGTH) {
if(!setup_dsa_sig(&sigblock, &sigblock_len)) {
verbose(VERB_QUERY, "verify: failed to setup DSA sig");
*reason = "use of key for DSA crypto failed";
EVP_PKEY_free(evp_key);
return sec_status_bogus;
}
docrypto_free = 1;
}
#endif
#if defined(USE_ECDSA) && defined(USE_DSA)
else
#endif
#ifdef USE_ECDSA
if(algo == LDNS_ECDSAP256SHA256 || algo == LDNS_ECDSAP384SHA384) {
/* EVP uses ASN prefix on sig, which is not in the wire data */
if(!setup_ecdsa_sig(&sigblock, &sigblock_len)) {
verbose(VERB_QUERY, "verify: failed to setup ECDSA sig");
*reason = "use of signature for ECDSA crypto failed";
EVP_PKEY_free(evp_key);
return sec_status_bogus;
}
dofree = 1;
}
#endif /* USE_ECDSA */
/* do the signature cryptography work */
#ifdef HAVE_EVP_MD_CTX_NEW
ctx = EVP_MD_CTX_new();
#else
ctx = (EVP_MD_CTX*)malloc(sizeof(*ctx));
if(ctx) EVP_MD_CTX_init(ctx);
#endif
if(!ctx) {
log_err("EVP_MD_CTX_new: malloc failure");
EVP_PKEY_free(evp_key);
if(dofree) free(sigblock);
else if(docrypto_free) OPENSSL_free(sigblock);
return sec_status_unchecked;
}
#ifndef HAVE_EVP_DIGESTVERIFY
if(EVP_DigestInit(ctx, digest_type) == 0) {
verbose(VERB_QUERY, "verify: EVP_DigestInit failed");
#ifdef HAVE_EVP_MD_CTX_NEW
EVP_MD_CTX_destroy(ctx);
#else
EVP_MD_CTX_cleanup(ctx);
free(ctx);
#endif
EVP_PKEY_free(evp_key);
if(dofree) free(sigblock);
else if(docrypto_free) OPENSSL_free(sigblock);
return sec_status_unchecked;
}
if(EVP_DigestUpdate(ctx, (unsigned char*)sldns_buffer_begin(buf),
(unsigned int)sldns_buffer_limit(buf)) == 0) {
verbose(VERB_QUERY, "verify: EVP_DigestUpdate failed");
#ifdef HAVE_EVP_MD_CTX_NEW
EVP_MD_CTX_destroy(ctx);
#else
EVP_MD_CTX_cleanup(ctx);
free(ctx);
#endif
EVP_PKEY_free(evp_key);
if(dofree) free(sigblock);
else if(docrypto_free) OPENSSL_free(sigblock);
return sec_status_unchecked;
}
res = EVP_VerifyFinal(ctx, sigblock, sigblock_len, evp_key);
#else /* HAVE_EVP_DIGESTVERIFY */
if(EVP_DigestVerifyInit(ctx, NULL, digest_type, NULL, evp_key) == 0) {
verbose(VERB_QUERY, "verify: EVP_DigestVerifyInit failed");
#ifdef HAVE_EVP_MD_CTX_NEW
EVP_MD_CTX_destroy(ctx);
#else
EVP_MD_CTX_cleanup(ctx);
free(ctx);
#endif
EVP_PKEY_free(evp_key);
if(dofree) free(sigblock);
else if(docrypto_free) OPENSSL_free(sigblock);
return sec_status_unchecked;
}
res = EVP_DigestVerify(ctx, sigblock, sigblock_len,
(unsigned char*)sldns_buffer_begin(buf),
sldns_buffer_limit(buf));
#endif
#ifdef HAVE_EVP_MD_CTX_NEW
EVP_MD_CTX_destroy(ctx);
#else
EVP_MD_CTX_cleanup(ctx);
free(ctx);
#endif
EVP_PKEY_free(evp_key);
if(dofree) free(sigblock);
else if(docrypto_free) OPENSSL_free(sigblock);
if(res == 1) {
return sec_status_secure;
} else if(res == 0) {
verbose(VERB_QUERY, "verify: signature mismatch");
*reason = "signature crypto failed";
return sec_status_bogus;
}
log_crypto_error("verify:", ERR_get_error());
return sec_status_unchecked;
}
/**************************************************/
#elif defined(HAVE_NSS)
/* libnss implementation */
/* nss3 */
#include "sechash.h"
#include "pk11pub.h"
#include "keyhi.h"
#include "secerr.h"
#include "cryptohi.h"
/* nspr4 */
#include "prerror.h"
/* return size of digest if supported, or 0 otherwise */
size_t
nsec3_hash_algo_size_supported(int id)
{
switch(id) {
case NSEC3_HASH_SHA1:
return SHA1_LENGTH;
default:
return 0;
}
}
/* perform nsec3 hash. return false on failure */
int
secalgo_nsec3_hash(int algo, unsigned char* buf, size_t len,
unsigned char* res)
{
switch(algo) {
case NSEC3_HASH_SHA1:
(void)HASH_HashBuf(HASH_AlgSHA1, res, buf, (unsigned long)len);
return 1;
default:
return 0;
}
}
void
secalgo_hash_sha256(unsigned char* buf, size_t len, unsigned char* res)
{
(void)HASH_HashBuf(HASH_AlgSHA256, res, buf, (unsigned long)len);
}
size_t
ds_digest_size_supported(int algo)
{
/* uses libNSS */
switch(algo) {
#ifdef USE_SHA1
case LDNS_SHA1:
return SHA1_LENGTH;
#endif
#ifdef USE_SHA2
case LDNS_SHA256:
return SHA256_LENGTH;
#endif
#ifdef USE_ECDSA
case LDNS_SHA384:
return SHA384_LENGTH;
#endif
/* GOST not supported in NSS */
case LDNS_HASH_GOST:
default: break;
}
return 0;
}
int
secalgo_ds_digest(int algo, unsigned char* buf, size_t len,
unsigned char* res)
{
/* uses libNSS */
switch(algo) {
#ifdef USE_SHA1
case LDNS_SHA1:
return HASH_HashBuf(HASH_AlgSHA1, res, buf, len)
== SECSuccess;
#endif
#if defined(USE_SHA2)
case LDNS_SHA256:
return HASH_HashBuf(HASH_AlgSHA256, res, buf, len)
== SECSuccess;
#endif
#ifdef USE_ECDSA
case LDNS_SHA384:
return HASH_HashBuf(HASH_AlgSHA384, res, buf, len)
== SECSuccess;
#endif
case LDNS_HASH_GOST:
default:
verbose(VERB_QUERY, "unknown DS digest algorithm %d",
algo);
break;
}
return 0;
}
int
dnskey_algo_id_is_supported(int id)
{
/* uses libNSS */
switch(id) {
case LDNS_RSAMD5:
/* RFC 6725 deprecates RSAMD5 */
return 0;
#if defined(USE_SHA1) || defined(USE_SHA2)
#if defined(USE_DSA) && defined(USE_SHA1)
case LDNS_DSA:
case LDNS_DSA_NSEC3:
#endif
#ifdef USE_SHA1
case LDNS_RSASHA1:
case LDNS_RSASHA1_NSEC3:
#endif
#ifdef USE_SHA2
case LDNS_RSASHA256:
#endif
#ifdef USE_SHA2
case LDNS_RSASHA512:
#endif
return 1;
#endif /* SHA1 or SHA2 */
#ifdef USE_ECDSA
case LDNS_ECDSAP256SHA256:
case LDNS_ECDSAP384SHA384:
return PK11_TokenExists(CKM_ECDSA);
#endif
case LDNS_ECC_GOST:
default:
return 0;
}
}
/* return a new public key for NSS */
static SECKEYPublicKey* nss_key_create(KeyType ktype)
{
SECKEYPublicKey* key;
PLArenaPool* arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if(!arena) {
log_err("out of memory, PORT_NewArena failed");
return NULL;
}
key = PORT_ArenaZNew(arena, SECKEYPublicKey);
if(!key) {
log_err("out of memory, PORT_ArenaZNew failed");
PORT_FreeArena(arena, PR_FALSE);
return NULL;
}
key->arena = arena;
key->keyType = ktype;
key->pkcs11Slot = NULL;
key->pkcs11ID = CK_INVALID_HANDLE;
return key;
}
static SECKEYPublicKey* nss_buf2ecdsa(unsigned char* key, size_t len, int algo)
{
SECKEYPublicKey* pk;
SECItem pub = {siBuffer, NULL, 0};
SECItem params = {siBuffer, NULL, 0};
static unsigned char param256[] = {
/* OBJECTIDENTIFIER 1.2.840.10045.3.1.7 (P-256)
* {iso(1) member-body(2) us(840) ansi-x962(10045) curves(3) prime(1) prime256v1(7)} */
0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07
};
static unsigned char param384[] = {
/* OBJECTIDENTIFIER 1.3.132.0.34 (P-384)
* {iso(1) identified-organization(3) certicom(132) curve(0) ansip384r1(34)} */
0x06, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x22
};
unsigned char buf[256+2]; /* sufficient for 2*384/8+1 */
/* check length, which uncompressed must be 2 bignums */
if(algo == LDNS_ECDSAP256SHA256) {
if(len != 2*256/8) return NULL;
/* ECCurve_X9_62_PRIME_256V1 */
} else if(algo == LDNS_ECDSAP384SHA384) {
if(len != 2*384/8) return NULL;
/* ECCurve_X9_62_PRIME_384R1 */
} else return NULL;
buf[0] = 0x04; /* POINT_FORM_UNCOMPRESSED */
memmove(buf+1, key, len);
pub.data = buf;
pub.len = len+1;
if(algo == LDNS_ECDSAP256SHA256) {
params.data = param256;
params.len = sizeof(param256);
} else {
params.data = param384;
params.len = sizeof(param384);
}
pk = nss_key_create(ecKey);
if(!pk)
return NULL;
pk->u.ec.size = (len/2)*8;
if(SECITEM_CopyItem(pk->arena, &pk->u.ec.publicValue, &pub)) {
SECKEY_DestroyPublicKey(pk);
return NULL;
}
if(SECITEM_CopyItem(pk->arena, &pk->u.ec.DEREncodedParams, ¶ms)) {
SECKEY_DestroyPublicKey(pk);
return NULL;
}
return pk;
}
static SECKEYPublicKey* nss_buf2dsa(unsigned char* key, size_t len)
{
SECKEYPublicKey* pk;
uint8_t T;
uint16_t length;
uint16_t offset;
SECItem Q = {siBuffer, NULL, 0};
SECItem P = {siBuffer, NULL, 0};
SECItem G = {siBuffer, NULL, 0};
SECItem Y = {siBuffer, NULL, 0};