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Various crypto fixes

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* Support sha384 with glib crypto backend
  * Improve error reporting for unsupported cipher modes
  * Avoid memory leak when bad cipher mode is given
  * Run pbkdf tests on macOS
  * Runtime check for pbkdf hash impls with gnutls & gcrypt
  * Avoid hangs counter pbkdf iterations on some Linux kernels
    by using a throwaway thread for benchmarking performance
  * Fix iotests expected output from gnutls errors
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Merge tag 'crypto-fixes-pull-request' of https://gitlab.com/berrange/qemu into staging

Various crypto fixes

 * Support sha384 with glib crypto backend
 * Improve error reporting for unsupported cipher modes
 * Avoid memory leak when bad cipher mode is given
 * Run pbkdf tests on macOS
 * Runtime check for pbkdf hash impls with gnutls & gcrypt
 * Avoid hangs counter pbkdf iterations on some Linux kernels
   by using a throwaway thread for benchmarking performance
 * Fix iotests expected output from gnutls errors

# -----BEGIN PGP SIGNATURE-----
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# 7PHf4krOSzA+wL67FP+u8x0sVhpPmbPRvU8VW4+D+Av91TK5wo0=
# =wLAZ
# -----END PGP SIGNATURE-----
# gpg: Signature made Mon 09 Sep 2024 15:16:14 BST
# gpg:                using RSA key DAF3A6FDB26B62912D0E8E3FBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" [full]
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>" [full]
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E  8E3F BE86 EBB4 1510 4FDF

* tag 'crypto-fixes-pull-request' of https://gitlab.com/berrange/qemu:
  crypto: Introduce x509 utils
  crypto: Support SHA384 hash when using glib
  crypto: Define macros for hash algorithm digest lengths
  crypto: use consistent error reporting pattern for unsupported cipher modes
  crypto: avoid leak of ctx when bad cipher mode is given
  tests/unit: build pbkdf test on macOS
  tests/unit: always build the pbkdf crypto unit test
  crypto: check gnutls & gcrypt support the requested pbkdf hash
  crypto: run qcrypto_pbkdf2_count_iters in a new thread
  iotests: fix expected output from gnutls

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2024-09-09 15:19:31 +01:00
commit 7bbadc60b5
13 changed files with 200 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
crypto/cipher-nettle.c.inc
View File

@ -525,8 +525,10 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_MODE_CTR:
drv = &qcrypto_nettle_des_driver_ctr;
break;
default:
case QCRYPTO_CIPHER_MODE_XTS:
goto bad_cipher_mode;
default:
g_assert_not_reached();
}
ctx = g_new0(QCryptoNettleDES, 1);
@ -551,8 +553,10 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_MODE_CTR:
drv = &qcrypto_nettle_des3_driver_ctr;
break;
default:
case QCRYPTO_CIPHER_MODE_XTS:
goto bad_cipher_mode;
default:
g_assert_not_reached();
}
ctx = g_new0(QCryptoNettleDES3, 1);
@ -663,8 +667,10 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_MODE_CTR:
drv = &qcrypto_nettle_cast128_driver_ctr;
break;
default:
case QCRYPTO_CIPHER_MODE_XTS:
goto bad_cipher_mode;
default:
g_assert_not_reached();
}
ctx = g_new0(QCryptoNettleCAST128, 1);
@ -734,16 +740,23 @@ static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
#ifdef CONFIG_CRYPTO_SM4
case QCRYPTO_CIPHER_ALG_SM4:
{
QCryptoNettleSm4 *ctx = g_new0(QCryptoNettleSm4, 1);
QCryptoNettleSm4 *ctx;
const QCryptoCipherDriver *drv;
switch (mode) {
case QCRYPTO_CIPHER_MODE_ECB:
ctx->base.driver = &qcrypto_nettle_sm4_driver_ecb;
drv = &qcrypto_nettle_sm4_driver_ecb;
break;
default:
case QCRYPTO_CIPHER_MODE_CBC:
case QCRYPTO_CIPHER_MODE_CTR:
case QCRYPTO_CIPHER_MODE_XTS:
goto bad_cipher_mode;
default:
g_assert_not_reached();
}
ctx = g_new0(QCryptoNettleSm4, 1);
ctx->base.driver = drv;
sm4_set_encrypt_key(&ctx->key[0], key);
sm4_set_decrypt_key(&ctx->key[1], key);

2
crypto/hash-glib.c
View File

@ -29,7 +29,7 @@ static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1,
[QCRYPTO_HASH_ALG_SHA224] = -1,
[QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256,
[QCRYPTO_HASH_ALG_SHA384] = -1,
[QCRYPTO_HASH_ALG_SHA384] = G_CHECKSUM_SHA384,
[QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
[QCRYPTO_HASH_ALG_RIPEMD160] = -1,
};

14
crypto/hash.c
View File

@ -23,13 +23,13 @@
#include "hashpriv.h"
static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = 16,
[QCRYPTO_HASH_ALG_SHA1] = 20,
[QCRYPTO_HASH_ALG_SHA224] = 28,
[QCRYPTO_HASH_ALG_SHA256] = 32,
[QCRYPTO_HASH_ALG_SHA384] = 48,
[QCRYPTO_HASH_ALG_SHA512] = 64,
[QCRYPTO_HASH_ALG_RIPEMD160] = 20,
[QCRYPTO_HASH_ALG_MD5] = QCRYPTO_HASH_DIGEST_LEN_MD5,
[QCRYPTO_HASH_ALG_SHA1] = QCRYPTO_HASH_DIGEST_LEN_SHA1,
[QCRYPTO_HASH_ALG_SHA224] = QCRYPTO_HASH_DIGEST_LEN_SHA224,
[QCRYPTO_HASH_ALG_SHA256] = QCRYPTO_HASH_DIGEST_LEN_SHA256,
[QCRYPTO_HASH_ALG_SHA384] = QCRYPTO_HASH_DIGEST_LEN_SHA384,
[QCRYPTO_HASH_ALG_SHA512] = QCRYPTO_HASH_DIGEST_LEN_SHA512,
[QCRYPTO_HASH_ALG_RIPEMD160] = QCRYPTO_HASH_DIGEST_LEN_RIPEMD160,
};
size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)

4
crypto/meson.build
View File

@ -24,6 +24,10 @@ crypto_ss.add(files(
'rsakey.c',
))
if gnutls.found()
crypto_ss.add(files('x509-utils.c'))
endif
if nettle.found()
crypto_ss.add(nettle, files('hash-nettle.c', 'hmac-nettle.c', 'pbkdf-nettle.c'))
if hogweed.found()

2
crypto/pbkdf-gcrypt.c
View File

@ -33,7 +33,7 @@ bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
case QCRYPTO_HASH_ALG_SHA384:
case QCRYPTO_HASH_ALG_SHA512:
case QCRYPTO_HASH_ALG_RIPEMD160:
return true;
return qcrypto_hash_supports(hash);
default:
return false;
}

2
crypto/pbkdf-gnutls.c
View File

@ -33,7 +33,7 @@ bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
case QCRYPTO_HASH_ALG_SHA384:
case QCRYPTO_HASH_ALG_SHA512:
case QCRYPTO_HASH_ALG_RIPEMD160:
return true;
return qcrypto_hash_supports(hash);
default:
return false;
}

53
crypto/pbkdf.c
View File

@ -19,6 +19,7 @@
*/
#include "qemu/osdep.h"
#include "qemu/thread.h"
#include "qapi/error.h"
#include "crypto/pbkdf.h"
#ifndef _WIN32
@ -85,12 +86,28 @@ static int qcrypto_pbkdf2_get_thread_cpu(unsigned long long *val_ms,
#endif
}
uint64_t qcrypto_pbkdf2_count_iters(QCryptoHashAlgorithm hash,
const uint8_t *key, size_t nkey,
const uint8_t *salt, size_t nsalt,
size_t nout,
Error **errp)
typedef struct CountItersData {
QCryptoHashAlgorithm hash;
const uint8_t *key;
size_t nkey;
const uint8_t *salt;
size_t nsalt;
size_t nout;
uint64_t iterations;
Error **errp;
} CountItersData;
static void *threaded_qcrypto_pbkdf2_count_iters(void *data)
{
CountItersData *iters_data = (CountItersData *) data;
QCryptoHashAlgorithm hash = iters_data->hash;
const uint8_t *key = iters_data->key;
size_t nkey = iters_data->nkey;
const uint8_t *salt = iters_data->salt;
size_t nsalt = iters_data->nsalt;
size_t nout = iters_data->nout;
Error **errp = iters_data->errp;
uint64_t ret = -1;
g_autofree uint8_t *out = g_new(uint8_t, nout);
uint64_t iterations = (1 << 15);
@ -114,7 +131,10 @@ uint64_t qcrypto_pbkdf2_count_iters(QCryptoHashAlgorithm hash,
delta_ms = end_ms - start_ms;
if (delta_ms > 500) {
if (delta_ms == 0) { /* sanity check */
error_setg(errp, "Unable to get accurate CPU usage");
goto cleanup;
} else if (delta_ms > 500) {
break;
} else if (delta_ms < 100) {
iterations = iterations * 10;
@ -129,5 +149,24 @@ uint64_t qcrypto_pbkdf2_count_iters(QCryptoHashAlgorithm hash,
cleanup:
memset(out, 0, nout);
return ret;
iters_data->iterations = ret;
return NULL;
}
uint64_t qcrypto_pbkdf2_count_iters(QCryptoHashAlgorithm hash,
const uint8_t *key, size_t nkey,
const uint8_t *salt, size_t nsalt,
size_t nout,
Error **errp)
{
CountItersData data = {
hash, key, nkey, salt, nsalt, nout, 0, errp
};
QemuThread thread;
qemu_thread_create(&thread, "pbkdf2", threaded_qcrypto_pbkdf2_count_iters,
&data, QEMU_THREAD_JOINABLE);
qemu_thread_join(&thread);
return data.iterations;
}

76
crypto/x509-utils.c Normal file
View File

@ -0,0 +1,76 @@
/*
* X.509 certificate related helpers
*
* Copyright (c) 2024 Dorjoy Chowdhury <dorjoychy111@gmail.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version. See the COPYING file in the
* top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "crypto/x509-utils.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include <gnutls/x509.h>
static const int qcrypto_to_gnutls_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5,
[QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1,
[QCRYPTO_HASH_ALG_SHA224] = GNUTLS_DIG_SHA224,
[QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256,
[QCRYPTO_HASH_ALG_SHA384] = GNUTLS_DIG_SHA384,
[QCRYPTO_HASH_ALG_SHA512] = GNUTLS_DIG_SHA512,
[QCRYPTO_HASH_ALG_RIPEMD160] = GNUTLS_DIG_RMD160,
};
int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size,
QCryptoHashAlgorithm alg,
uint8_t *result,
size_t *resultlen,
Error **errp)
{
int ret = -1;
int hlen;
gnutls_x509_crt_t crt;
gnutls_datum_t datum = {.data = cert, .size = size};
if (alg >= G_N_ELEMENTS(qcrypto_to_gnutls_hash_alg_map)) {
error_setg(errp, "Unknown hash algorithm");
return -1;
}
if (result == NULL) {
error_setg(errp, "No valid buffer given");
return -1;
}
gnutls_x509_crt_init(&crt);
if (gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM) != 0) {
error_setg(errp, "Failed to import certificate");
goto cleanup;
}
hlen = gnutls_hash_get_len(qcrypto_to_gnutls_hash_alg_map[alg]);
if (*resultlen < hlen) {
error_setg(errp,
"Result buffer size %zu is smaller than hash %d",
*resultlen, hlen);
goto cleanup;
}
if (gnutls_x509_crt_get_fingerprint(crt,
qcrypto_to_gnutls_hash_alg_map[alg],
result, resultlen) != 0) {
error_setg(errp, "Failed to get fingerprint from certificate");
goto cleanup;
}
ret = 0;
cleanup:
gnutls_x509_crt_deinit(crt);
return ret;
}

8
include/crypto/hash.h
View File

@ -23,6 +23,14 @@
#include "qapi/qapi-types-crypto.h"
#define QCRYPTO_HASH_DIGEST_LEN_MD5 16
#define QCRYPTO_HASH_DIGEST_LEN_SHA1 20
#define QCRYPTO_HASH_DIGEST_LEN_SHA224 28
#define QCRYPTO_HASH_DIGEST_LEN_SHA256 32
#define QCRYPTO_HASH_DIGEST_LEN_SHA384 48
#define QCRYPTO_HASH_DIGEST_LEN_SHA512 64
#define QCRYPTO_HASH_DIGEST_LEN_RIPEMD160 20
/* See also "QCryptoHashAlgorithm" defined in qapi/crypto.json */
/**

22
include/crypto/x509-utils.h Normal file
View File

@ -0,0 +1,22 @@
/*
* X.509 certificate related helpers
*
* Copyright (c) 2024 Dorjoy Chowdhury <dorjoychy111@gmail.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version. See the COPYING file in the
* top-level directory.
*/
#ifndef QCRYPTO_X509_UTILS_H
#define QCRYPTO_X509_UTILS_H
#include "crypto/hash.h"
int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size,
QCryptoHashAlgorithm hash,
uint8_t *result,
size_t *resultlen,
Error **errp);
#endif

12
tests/qemu-iotests/233.out
View File

@ -69,8 +69,8 @@ read 1048576/1048576 bytes at offset 1048576
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== check TLS with authorization ==
qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: Software caused connection abort
qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: Software caused connection abort
qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: The TLS connection was non-properly terminated.
qemu-img: Could not open 'driver=nbd,host=127.0.0.1,port=PORT,tls-creds=tls0': Failed to read option reply: Cannot read from TLS channel: The TLS connection was non-properly terminated.
== check TLS fail over UNIX with no hostname ==
qemu-img: Could not open 'driver=nbd,path=SOCK_DIR/qemu-nbd.sock,tls-creds=tls0': No hostname for certificate validation
@ -103,14 +103,14 @@ qemu-img: Could not open 'driver=nbd,path=SOCK_DIR/qemu-nbd.sock,tls-creds=tls0'
qemu-nbd: TLS handshake failed: The TLS connection was non-properly terminated.
== final server log ==
qemu-nbd: option negotiation failed: Failed to read opts magic: Cannot read from TLS channel: Software caused connection abort
qemu-nbd: option negotiation failed: Failed to read opts magic: Cannot read from TLS channel: Software caused connection abort
qemu-nbd: option negotiation failed: Failed to read opts magic: Cannot read from TLS channel: The TLS connection was non-properly terminated.
qemu-nbd: option negotiation failed: Failed to read opts magic: Cannot read from TLS channel: The TLS connection was non-properly terminated.
qemu-nbd: option negotiation failed: Verify failed: No certificate was found.
qemu-nbd: option negotiation failed: Verify failed: No certificate was found.
qemu-nbd: option negotiation failed: TLS x509 authz check for DISTINGUISHED-NAME is denied
qemu-nbd: option negotiation failed: TLS x509 authz check for DISTINGUISHED-NAME is denied
qemu-nbd: option negotiation failed: Failed to read opts magic: Cannot read from TLS channel: Software caused connection abort
qemu-nbd: option negotiation failed: Failed to read opts magic: Cannot read from TLS channel: Software caused connection abort
qemu-nbd: option negotiation failed: Failed to read opts magic: Cannot read from TLS channel: The TLS connection was non-properly terminated.
qemu-nbd: option negotiation failed: Failed to read opts magic: Cannot read from TLS channel: The TLS connection was non-properly terminated.
qemu-nbd: option negotiation failed: TLS handshake failed: An illegal parameter has been received.
qemu-nbd: option negotiation failed: TLS handshake failed: An illegal parameter has been received.
*** done

2
tests/unit/meson.build
View File

@ -121,10 +121,8 @@ if have_block
if config_host_data.get('CONFIG_REPLICATION')
tests += {'test-replication': [testblock]}
endif
if nettle.found() or gcrypt.found()
tests += {'test-crypto-pbkdf': [io]}
endif
endif
if have_system
tests += {

13
tests/unit/test-crypto-pbkdf.c
View File

@ -25,8 +25,7 @@
#include <sys/resource.h>
#endif
#if ((defined(CONFIG_NETTLE) || defined(CONFIG_GCRYPT)) && \
(defined(_WIN32) || defined(RUSAGE_THREAD)))
#if defined(_WIN32) || defined(RUSAGE_THREAD) || defined(CONFIG_DARWNI)
#include "crypto/pbkdf.h"
typedef struct QCryptoPbkdfTestData QCryptoPbkdfTestData;
@ -394,7 +393,7 @@ static void test_pbkdf(const void *opaque)
}
static void test_pbkdf_timing(void)
static void test_pbkdf_timing_sha256(void)
{
uint8_t key[32];
uint8_t salt[32];
@ -422,14 +421,18 @@ int main(int argc, char **argv)
g_assert(qcrypto_init(NULL) == 0);
for (i = 0; i < G_N_ELEMENTS(test_data); i++) {
if (!qcrypto_pbkdf2_supports(test_data[i].hash)) {
continue;
}
if (!test_data[i].slow ||
g_test_slow()) {
g_test_add_data_func(test_data[i].path, &test_data[i], test_pbkdf);
}
}
if (g_test_slow()) {
g_test_add_func("/crypt0/pbkdf/timing", test_pbkdf_timing);
if (g_test_slow() && qcrypto_pbkdf2_supports(QCRYPTO_HASH_ALG_SHA256)) {
g_test_add_func("/crypt0/pbkdf/timing/sha256", test_pbkdf_timing_sha256);
}
return g_test_run();