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Remove RSA PKCS#1 v1.5 support from cert_tool

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Support for PKCS#1 v1.5 was deprecated in SHA 1001202 and fully removed
in SHA fe199e3, however, cert_tool is still able to generate
certificates in that form. This patch fully removes the ability for
cert_tool to generate these certificates.

Additionally, this patch also fixes a bug where the issuing certificate
was a RSA and the issued certificate was EcDSA. In this case, the issued
certificate would be signed using PKCS#1 v1.5 instead of RSAPSS per
PKCS#1 v2.1, preventing TF-A from verifying the image signatures. Now
that PKCS#1 v1.5 support is removed, all certificates that are signed
with RSA now use the more modern padding scheme.

Change-Id: Id87d7d915be594a1876a73080528d968e65c4e9a
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>
This commit is contained in:
Justin Chadwell 2019-09-09 15:24:31 +01:00
parent f29213d9e3
commit 6a415a508e
7 changed files with 12 additions and 21 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
docs/getting_started/user-guide.rst
View file

@ -588,10 +588,8 @@ Common build options
- ``KEY_ALG``: This build flag enables the user to select the algorithm to be
used for generating the PKCS keys and subsequent signing of the certificate.
It accepts 3 values: ``rsa``, ``rsa_1_5`` and ``ecdsa``. The option
``rsa_1_5`` is the legacy PKCS#1 RSA 1.5 algorithm which is not TBBR
compliant and is retained only for compatibility. The default value of this
flag is ``rsa`` which is the TBBR compliant PKCS#1 RSA 2.1 scheme.
It accepts 2 values: ``rsa`` and ``ecdsa``. The default value of this flag
is ``rsa`` which is the TBBR compliant PKCS#1 RSA 2.1 scheme.
- ``KEY_SIZE``: This build flag enables the user to select the key size for
the algorithm specified by ``KEY_ALG``. The valid values for ``KEY_SIZE``

6
drivers/auth/mbedtls/mbedtls_common.mk
View file

@ -48,9 +48,9 @@ LIBMBEDTLS_SRCS := $(addprefix ${MBEDTLS_DIR}/library/, \
)
# The platform may define the variable 'TF_MBEDTLS_KEY_ALG' to select the key
# algorithm to use. If the variable is not defined, select it based on algorithm
# used for key generation `KEY_ALG`. If `KEY_ALG` is not defined or is
# defined to `rsa`/`rsa_1_5`, then set the variable to `rsa`.
# algorithm to use. If the variable is not defined, select it based on
# algorithm used for key generation `KEY_ALG`. If `KEY_ALG` is not defined,
# then it is set to `rsa`.
ifeq (${TF_MBEDTLS_KEY_ALG},)
ifeq (${KEY_ALG}, ecdsa)
TF_MBEDTLS_KEY_ALG := ecdsa

3
tools/cert_create/include/cert.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -49,7 +49,6 @@ int cert_init(void);
cert_t *cert_get_by_opt(const char *opt);
int cert_add_ext(X509 *issuer, X509 *subject, int nid, char *value);
int cert_new(
int key_alg,
int md_alg,
cert_t *cert,
int days,

2
tools/cert_create/include/key.h
View file

@ -21,7 +21,6 @@ enum {
/* Supported key algorithms */
enum {
KEY_ALG_RSA, /* RSA PSS as defined by PKCS#1 v2.1 (default) */
KEY_ALG_RSA_1_5, /* RSA as defined by PKCS#1 v1.5 */
#ifndef OPENSSL_NO_EC
KEY_ALG_ECDSA,
#endif /* OPENSSL_NO_EC */
@ -42,7 +41,6 @@ enum{
/* NOTE: the first item in each array is the default key size */
static const unsigned int KEY_SIZES[KEY_ALG_MAX_NUM][KEY_SIZE_MAX_NUM] = {
{ 2048, 1024, 3072, 4096 }, /* KEY_ALG_RSA */
{ 2048, 1024, 3072, 4096 }, /* KEY_ALG_RSA_1_5 */
#ifndef OPENSSL_NO_EC
{} /* KEY_ALG_ECDSA */
#endif /* OPENSSL_NO_EC */

9
tools/cert_create/src/cert.c
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -93,7 +93,6 @@ int cert_add_ext(X509 *issuer, X509 *subject, int nid, char *value)
}
int cert_new(
int key_alg,
int md_alg,
cert_t *cert,
int days,
@ -143,10 +142,10 @@ int cert_new(
}
/*
* Set additional parameters if algorithm is RSA PSS. This is not
* required for RSA 1.5 or ECDSA.
* Set additional parameters if issuing public key algorithm is RSA.
* This is not required for ECDSA.
*/
if (key_alg == KEY_ALG_RSA) {
if (EVP_PKEY_base_id(ikey) == EVP_PKEY_RSA) {
if (!EVP_PKEY_CTX_set_rsa_padding(pKeyCtx, RSA_PKCS1_PSS_PADDING)) {
ERR_print_errors_fp(stdout);
goto END;

1
tools/cert_create/src/key.c
View file

@ -112,7 +112,6 @@ err:
typedef int (*key_create_fn_t)(key_t *key, int key_bits);
static const key_create_fn_t key_create_fn[KEY_ALG_MAX_NUM] = {
key_create_rsa, /* KEY_ALG_RSA */
key_create_rsa, /* KEY_ALG_RSA_1_5 */
#ifndef OPENSSL_NO_EC
key_create_ecdsa, /* KEY_ALG_ECDSA */
#endif /* OPENSSL_NO_EC */

6
tools/cert_create/src/main.c
View file

@ -92,7 +92,6 @@ static char *strdup(const char *str)
static const char *key_algs_str[] = {
[KEY_ALG_RSA] = "rsa",
[KEY_ALG_RSA_1_5] = "rsa_1_5",
#ifndef OPENSSL_NO_EC
[KEY_ALG_ECDSA] = "ecdsa"
#endif /* OPENSSL_NO_EC */
@ -277,8 +276,7 @@ static const cmd_opt_t common_cmd_opt[] = {
},
{
{ "key-alg", required_argument, NULL, 'a' },
"Key algorithm: 'rsa' (default) - RSAPSS scheme as per \
PKCS#1 v2.1, 'rsa_1_5' - RSA PKCS#1 v1.5, 'ecdsa'"
"Key algorithm: 'rsa' (default)- RSAPSS scheme as per PKCS#1 v2.1, 'ecdsa'"
},
{
{ "key-size", required_argument, NULL, 'b' },
@ -545,7 +543,7 @@ int main(int argc, char *argv[])
}
/* Create certificate. Signed with corresponding key */
if (cert->fn && !cert_new(key_alg, hash_alg, cert, VAL_DAYS, 0, sk)) {
if (cert->fn && !cert_new(hash_alg, cert, VAL_DAYS, 0, sk)) {
ERROR("Cannot create %s\n", cert->cn);
exit(1);
}