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Merge qcrypto-next 2016/07/21 v1

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Merge remote-tracking branch 'remotes/berrange/tags/pull-qcrypto-2016-07-21-1' into staging

Merge qcrypto-next 2016/07/21 v1

# gpg: Signature made Thu 21 Jul 2016 11:07:36 BST
# gpg:                using RSA key 0xBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>"
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>"
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E  8E3F BE86 EBB4 1510 4FDF

* remotes/berrange/tags/pull-qcrypto-2016-07-21-1:
  crypto: don't open-code qcrypto_hash_supports
  crypto: use glib as fallback for hash algorithm
  crypto: use /dev/[u]random as a final fallback random source

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2016-07-21 11:48:49 +01:00
commit 7239247a2b
6 changed files with 136 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
crypto/Makefile.objs
View File

@ -2,6 +2,7 @@ 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-$(if $(CONFIG_NETTLE),n,$(if $(CONFIG_GCRYPT),n,y)) += hash-glib.o
crypto-obj-y += aes.o
crypto-obj-y += desrfb.o
crypto-obj-y += cipher.o
@ -12,6 +13,7 @@ crypto-obj-y += tlssession.o
crypto-obj-y += secret.o
crypto-obj-$(CONFIG_GCRYPT) += random-gcrypt.o
crypto-obj-$(if $(CONFIG_GCRYPT),n,$(CONFIG_GNUTLS_RND)) += random-gnutls.o
crypto-obj-$(if $(CONFIG_GCRYPT),n,$(if $(CONFIG_GNUTLS_RND),n,y)) += random-platform.o
crypto-obj-y += pbkdf.o
crypto-obj-$(CONFIG_NETTLE_KDF) += pbkdf-nettle.o
crypto-obj-$(if $(CONFIG_NETTLE_KDF),n,$(CONFIG_GCRYPT_KDF)) += pbkdf-gcrypt.o
@ -28,6 +30,4 @@ crypto-obj-y += block-luks.o
# Let the userspace emulators avoid linking gnutls/etc
crypto-aes-obj-y = aes.o
stub-obj-y += random-stub.o
stub-obj-y += pbkdf-stub.o
stub-obj-y += hash-stub.o

3
crypto/hash-gcrypt.c
View File

@ -55,8 +55,7 @@ int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
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) {
if (!qcrypto_hash_supports(alg)) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);

97
crypto/hash-glib.c Normal file
View File

@ -0,0 +1,97 @@
/*
* 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"
static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5,
[QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1,
[QCRYPTO_HASH_ALG_SHA224] = -1,
[QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256,
[QCRYPTO_HASH_ALG_SHA384] = -1,
#if GLIB_CHECK_VERSION(2, 36, 0)
[QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
#else
[QCRYPTO_HASH_ALG_SHA512] = -1,
#endif
[QCRYPTO_HASH_ALG_RIPEMD160] = -1,
};
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
qcrypto_hash_alg_map[alg] != -1) {
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;
GChecksum *cs;
if (!qcrypto_hash_supports(alg)) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);
return -1;
}
cs = g_checksum_new(qcrypto_hash_alg_map[alg]);
for (i = 0; i < niov; i++) {
g_checksum_update(cs, iov[i].iov_base, iov[i].iov_len);
}
ret = g_checksum_type_get_length(qcrypto_hash_alg_map[alg]);
if (ret < 0) {
error_setg(errp, "%s",
"Unable to get hash length");
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;
}
g_checksum_get_digest(cs, *result, resultlen);
g_checksum_free(cs);
return 0;
error:
g_checksum_free(cs);
return -1;
}

3
crypto/hash-nettle.c
View File

@ -113,8 +113,7 @@ int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
int i;
union qcrypto_hash_ctx ctx;
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
qcrypto_hash_alg_map[alg].init == NULL) {
if (!qcrypto_hash_supports(alg)) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);

41
crypto/hash-stub.c
View File

@ -1,41 +0,0 @@
/*
* 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;
}

37
crypto/random-stub.c → crypto/random-platform.c
View File

@ -26,6 +26,39 @@ int qcrypto_random_bytes(uint8_t *buf G_GNUC_UNUSED,
size_t buflen G_GNUC_UNUSED,
Error **errp)
{
error_setg(errp, "No random byte source provided in this build");
return -1;
int fd;
int ret = -1;
int got;
/* TBD perhaps also add support for BSD getentropy / Linux
* getrandom syscalls directly */
fd = open("/dev/urandom", O_RDONLY);
if (fd == -1 && errno == ENOENT) {
fd = open("/dev/random", O_RDONLY);
}
if (fd < 0) {
error_setg(errp, "No /dev/urandom or /dev/random found");
return -1;
}
while (buflen > 0) {
got = read(fd, buf, buflen);
if (got < 0) {
error_setg_errno(errp, errno,
"Unable to read random bytes");
goto cleanup;
} else if (!got) {
error_setg(errp,
"Unexpected EOF reading random bytes");
goto cleanup;
}
buflen -= got;
buf += got;
}
ret = 0;
cleanup:
close(fd);
return ret;
}