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crypto: switch hash code to use nettle/gcrypt directly

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Currently the internal hash code is using the gnutls hash APIs.
GNUTLS in turn is wrapping either nettle or gcrypt. Not only
were the GNUTLS hash APIs not added until GNUTLS 2.9.10, but
they don't expose support for all the algorithms QEMU needs
to use with LUKS.

Address this by directly wrapping nettle/gcrypt in QEMU and
avoiding GNUTLS's extra layer of indirection. This gives us
support for hash functions on a much wider range of platforms
and opens up ability to support more hash functions. It also
avoids a GNUTLS bug which would not correctly handle hashing
of large data blocks if int != size_t.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-03-11 18:09:22 +00:00
parent 8cbfc94269
commit 0c16c056a4
8 changed files with 299 additions and 122 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
configure vendored
View File

@ -306,7 +306,6 @@ gtk=""
gtkabi=""
gtk_gl="no"
gnutls=""
gnutls_hash=""
gnutls_rnd=""
nettle=""
nettle_kdf="no"
@ -2218,13 +2217,6 @@ if test "$gnutls" != "no"; then
QEMU_CFLAGS="$QEMU_CFLAGS $gnutls_cflags"
gnutls="yes"
# gnutls_hash_init requires >= 2.9.10
if $pkg_config --exists "gnutls >= 2.9.10"; then
gnutls_hash="yes"
else
gnutls_hash="no"
fi
# gnutls_rnd requires >= 2.11.0
if $pkg_config --exists "gnutls >= 2.11.0"; then
gnutls_rnd="yes"
@ -2258,11 +2250,9 @@ if test "$gnutls" != "no"; then
feature_not_found "gnutls" "Install gnutls devel"
else
gnutls="no"
gnutls_hash="no"
gnutls_rnd="no"
fi
else
gnutls_hash="no"
gnutls_rnd="no"
fi
@ -4813,7 +4803,6 @@ echo "GTK support $gtk $(echo_version $gtk $gtk_version)"
echo "GTK GL support $gtk_gl"
echo "VTE support $vte $(echo_version $vte $vteversion)"
echo "GNUTLS support $gnutls"
echo "GNUTLS hash $gnutls_hash"
echo "GNUTLS rnd $gnutls_rnd"
echo "libgcrypt $gcrypt"
echo "libgcrypt kdf $gcrypt_kdf"
@ -5179,9 +5168,6 @@ fi
if test "$gnutls" = "yes" ; then
echo "CONFIG_GNUTLS=y" >> $config_host_mak
fi
if test "$gnutls_hash" = "yes" ; then
echo "CONFIG_GNUTLS_HASH=y" >> $config_host_mak
fi
if test "$gnutls_rnd" = "yes" ; then
echo "CONFIG_GNUTLS_RND=y" >> $config_host_mak
fi

3
crypto/Makefile.objs
View File

@ -1,5 +1,7 @@
crypto-obj-y = init.o
crypto-obj-y += hash.o
crypto-obj-$(CONFIG_NETTLE) += hash-nettle.o
crypto-obj-$(if $(CONFIG_NETTLE),n,$(CONFIG_GCRYPT)) += hash-gcrypt.o
crypto-obj-y += aes.o
crypto-obj-y += desrfb.o
crypto-obj-y += cipher.o
@ -28,3 +30,4 @@ crypto-aes-obj-y = aes.o
stub-obj-y += random-stub.o
stub-obj-y += pbkdf-stub.o
stub-obj-y += hash-stub.o

106
crypto/hash-gcrypt.c Normal file
View File

@ -0,0 +1,106 @@
/*
* QEMU Crypto hash algorithms
*
* Copyright (c) 2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "crypto/hash.h"
#include "gcrypt.h"
static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = GCRY_MD_MD5,
[QCRYPTO_HASH_ALG_SHA1] = GCRY_MD_SHA1,
[QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256,
};
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
qcrypto_hash_alg_map[alg] != GCRY_MD_NONE) {
return true;
}
return false;
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov,
uint8_t **result,
size_t *resultlen,
Error **errp)
{
int i, ret;
gcry_md_hd_t md;
unsigned char *digest;
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
qcrypto_hash_alg_map[alg] == GCRY_MD_NONE) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);
return -1;
}
ret = gcry_md_open(&md, qcrypto_hash_alg_map[alg], 0);
if (ret < 0) {
error_setg(errp,
"Unable to initialize hash algorithm: %s",
gcry_strerror(ret));
return -1;
}
for (i = 0; i < niov; i++) {
gcry_md_write(md, iov[i].iov_base, iov[i].iov_len);
}
ret = gcry_md_get_algo_dlen(qcrypto_hash_alg_map[alg]);
if (ret <= 0) {
error_setg(errp,
"Unable to get hash length: %s",
gcry_strerror(ret));
goto error;
}
if (*resultlen == 0) {
*resultlen = ret;
*result = g_new0(uint8_t, *resultlen);
} else if (*resultlen != ret) {
error_setg(errp,
"Result buffer size %zu is smaller than hash %d",
*resultlen, ret);
goto error;
}
digest = gcry_md_read(md, 0);
if (!digest) {
error_setg(errp,
"No digest produced");
goto error;
}
memcpy(*result, digest, *resultlen);
gcry_md_close(md);
return 0;
error:
gcry_md_close(md);
return -1;
}

126
crypto/hash-nettle.c Normal file
View File

@ -0,0 +1,126 @@
/*
* QEMU Crypto hash algorithms
*
* Copyright (c) 2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "crypto/hash.h"
#include <nettle/md5.h>
#include <nettle/sha.h>
typedef void (*qcrypto_nettle_init)(void *ctx);
typedef void (*qcrypto_nettle_write)(void *ctx,
unsigned int len,
const uint8_t *buf);
typedef void (*qcrypto_nettle_result)(void *ctx,
unsigned int len,
uint8_t *buf);
union qcrypto_hash_ctx {
struct md5_ctx md5;
struct sha1_ctx sha1;
struct sha256_ctx sha256;
};
struct qcrypto_hash_alg {
qcrypto_nettle_init init;
qcrypto_nettle_write write;
qcrypto_nettle_result result;
size_t len;
} qcrypto_hash_alg_map[] = {
[QCRYPTO_HASH_ALG_MD5] = {
.init = (qcrypto_nettle_init)md5_init,
.write = (qcrypto_nettle_write)md5_update,
.result = (qcrypto_nettle_result)md5_digest,
.len = MD5_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA1] = {
.init = (qcrypto_nettle_init)sha1_init,
.write = (qcrypto_nettle_write)sha1_update,
.result = (qcrypto_nettle_result)sha1_digest,
.len = SHA1_DIGEST_SIZE,
},
[QCRYPTO_HASH_ALG_SHA256] = {
.init = (qcrypto_nettle_init)sha256_init,
.write = (qcrypto_nettle_write)sha256_update,
.result = (qcrypto_nettle_result)sha256_digest,
.len = SHA256_DIGEST_SIZE,
},
};
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
qcrypto_hash_alg_map[alg].init != NULL) {
return true;
}
return false;
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov,
uint8_t **result,
size_t *resultlen,
Error **errp)
{
int i;
union qcrypto_hash_ctx ctx;
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
qcrypto_hash_alg_map[alg].init == NULL) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);
return -1;
}
qcrypto_hash_alg_map[alg].init(&ctx);
for (i = 0; i < niov; i++) {
/* Some versions of nettle have functions
* declared with 'int' instead of 'size_t'
* so to be safe avoid writing more than
* UINT_MAX bytes at a time
*/
size_t len = iov[i].iov_len;
uint8_t *base = iov[i].iov_base;
while (len) {
size_t shortlen = MIN(len, UINT_MAX);
qcrypto_hash_alg_map[alg].write(&ctx, len, base);
len -= shortlen;
base += len;
}
}
if (*resultlen == 0) {
*resultlen = qcrypto_hash_alg_map[alg].len;
*result = g_new0(uint8_t, *resultlen);
} else if (*resultlen != qcrypto_hash_alg_map[alg].len) {
error_setg(errp,
"Result buffer size %zu is smaller than hash %zu",
*resultlen, qcrypto_hash_alg_map[alg].len);
return -1;
}
qcrypto_hash_alg_map[alg].result(&ctx, *resultlen, *result);
return 0;
}

41
crypto/hash-stub.c Normal file
View File

@ -0,0 +1,41 @@
/*
* QEMU Crypto hash algorithms
*
* Copyright (c) 2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "crypto/hash.h"
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg G_GNUC_UNUSED)
{
return false;
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov G_GNUC_UNUSED,
size_t niov G_GNUC_UNUSED,
uint8_t **result G_GNUC_UNUSED,
size_t *resultlen G_GNUC_UNUSED,
Error **errp)
{
error_setg(errp,
"Hash algorithm %d not supported without GNUTLS",
alg);
return -1;
}

105
crypto/hash.c
View File

@ -22,12 +22,6 @@
#include "qapi/error.h"
#include "crypto/hash.h"
#ifdef CONFIG_GNUTLS_HASH
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#endif
static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = 16,
[QCRYPTO_HASH_ALG_SHA1] = 20,
@ -41,105 +35,6 @@ size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
}
#ifdef CONFIG_GNUTLS_HASH
static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5,
[QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1,
[QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256,
};
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map)) {
return true;
}
return false;
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov,
uint8_t **result,
size_t *resultlen,
Error **errp)
{
int i, ret;
gnutls_hash_hd_t dig;
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map)) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);
return -1;
}
ret = gnutls_hash_init(&dig, qcrypto_hash_alg_map[alg]);
if (ret < 0) {
error_setg(errp,
"Unable to initialize hash algorithm: %s",
gnutls_strerror(ret));
return -1;
}
for (i = 0; i < niov; i++) {
ret = gnutls_hash(dig, iov[i].iov_base, iov[i].iov_len);
if (ret < 0) {
error_setg(errp,
"Unable process hash data: %s",
gnutls_strerror(ret));
goto error;
}
}
ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]);
if (ret <= 0) {
error_setg(errp,
"Unable to get hash length: %s",
gnutls_strerror(ret));
goto error;
}
if (*resultlen == 0) {
*resultlen = ret;
*result = g_new0(uint8_t, *resultlen);
} else if (*resultlen != ret) {
error_setg(errp,
"Result buffer size %zu is smaller than hash %d",
*resultlen, ret);
goto error;
}
gnutls_hash_deinit(dig, *result);
return 0;
error:
gnutls_hash_deinit(dig, NULL);
return -1;
}
#else /* ! CONFIG_GNUTLS_HASH */
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg G_GNUC_UNUSED)
{
return false;
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov G_GNUC_UNUSED,
size_t niov G_GNUC_UNUSED,
uint8_t **result G_GNUC_UNUSED,
size_t *resultlen G_GNUC_UNUSED,
Error **errp)
{
error_setg(errp,
"Hash algorithm %d not supported without GNUTLS",
alg);
return -1;
}
#endif /* ! CONFIG_GNUTLS_HASH */
int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
const char *buf,
size_t len,

2
tests/Makefile.include
View File

@ -86,7 +86,7 @@ check-unit-y += tests/test-qemu-opts$(EXESUF)
gcov-files-test-qemu-opts-y = qom/test-qemu-opts.c
check-unit-y += tests/test-write-threshold$(EXESUF)
gcov-files-test-write-threshold-y = block/write-threshold.c
check-unit-$(CONFIG_GNUTLS_HASH) += tests/test-crypto-hash$(EXESUF)
check-unit-y += tests/test-crypto-hash$(EXESUF)
check-unit-y += tests/test-crypto-cipher$(EXESUF)
check-unit-y += tests/test-crypto-secret$(EXESUF)
check-unit-$(CONFIG_GNUTLS) += tests/test-crypto-tlscredsx509$(EXESUF)

24
tests/test-crypto-hash.c
View File

@ -68,6 +68,10 @@ static void test_hash_alloc(void)
int ret;
size_t j;
if (!qcrypto_hash_supports(i)) {
continue;
}
ret = qcrypto_hash_bytes(i,
INPUT_TEXT,
strlen(INPUT_TEXT),
@ -98,6 +102,10 @@ static void test_hash_prealloc(void)
int ret;
size_t j;
if (!qcrypto_hash_supports(i)) {
continue;
}
resultlen = expected_lens[i];
result = g_new0(uint8_t, resultlen);
@ -137,6 +145,10 @@ static void test_hash_iov(void)
int ret;
size_t j;
if (!qcrypto_hash_supports(i)) {
continue;
}
ret = qcrypto_hash_bytesv(i,
iov, 3,
&result,
@ -165,6 +177,10 @@ static void test_hash_digest(void)
char *digest;
size_t digestsize;
if (!qcrypto_hash_supports(i)) {
continue;
}
digestsize = qcrypto_hash_digest_len(i);
g_assert_cmpint(digestsize * 2, ==, strlen(expected_outputs[i]));
@ -175,7 +191,7 @@ static void test_hash_digest(void)
&digest,
NULL);
g_assert(ret == 0);
g_assert(g_str_equal(digest, expected_outputs[i]));
g_assert_cmpstr(digest, ==, expected_outputs[i]);
g_free(digest);
}
}
@ -191,13 +207,17 @@ static void test_hash_base64(void)
int ret;
char *digest;
if (!qcrypto_hash_supports(i)) {
continue;
}
ret = qcrypto_hash_base64(i,
INPUT_TEXT,
strlen(INPUT_TEXT),
&digest,
NULL);
g_assert(ret == 0);
g_assert(g_str_equal(digest, expected_outputs_b64[i]));
g_assert_cmpstr(digest, ==, expected_outputs_b64[i]);
g_free(digest);
}
}