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48279d52a7
This patch adds support for non-volatile counter authentication to
the Authentication Module. This method consists of matching the
counter values provided in the certificates with the ones stored
in the platform. If the value from the certificate is lower than
the platform, the boot process is aborted. This mechanism protects
the system against rollback.
The TBBR CoT has been updated to include this method as part of the
authentication process. Two counters are used: one for the trusted
world images and another for the non trusted world images.
** NEW PLATFORM APIs (mandatory when TBB is enabled) **
int plat_get_nv_ctr(void *cookie, unsigned int *nv_ctr);
This API returns the non-volatile counter value stored
in the platform. The cookie in the first argument may be
used to select the counter in case the platform provides
more than one (i.e. TBSA compliant platforms must provide
trusted and non-trusted counters). This cookie is specified
in the CoT.
int plat_set_nv_ctr(void *cookie, unsigned int nv_ctr);
This API sets a new counter value. The cookie may be
used to select the counter to be updated.
An implementation of these new APIs for ARM platforms is also
provided. The values are obtained from the Trusted Non-Volatile
Counters peripheral. The cookie is used to pass the extension OID.
This OID may be interpreted by the platform to know which counter
must return. On Juno, The trusted and non-trusted counter values
have been tied to 31 and 223, respectively, and cannot be modified.
** IMPORTANT **
THIS PATCH BREAKS THE BUILD WHEN TRUSTED_BOARD_BOOT IS ENABLED. THE
NEW PLATFORM APIs INTRODUCED IN THIS PATCH MUST BE IMPLEMENTED IN
ORDER TO SUCCESSFULLY BUILD TF.
Change-Id: Ic943b76b25f2a37f490eaaab6d87b4a8b3cbc89a
145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/*
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* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __AUTH_COMMON_H__
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#define __AUTH_COMMON_H__
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/*
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* Authentication framework common types
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*/
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/*
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* Type of parameters that can be extracted from an image and
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* used for authentication
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*/
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typedef enum auth_param_type_enum {
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AUTH_PARAM_NONE,
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AUTH_PARAM_RAW_DATA, /* Raw image data */
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AUTH_PARAM_SIG, /* The image signature */
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AUTH_PARAM_SIG_ALG, /* The image signature algorithm */
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AUTH_PARAM_HASH, /* A hash (including the algorithm) */
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AUTH_PARAM_PUB_KEY, /* A public key */
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AUTH_PARAM_NV_CTR, /* A non-volatile counter */
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} auth_param_type_t;
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/*
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* Defines an authentication parameter. The cookie will be interpreted by the
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* image parser module.
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*/
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typedef struct auth_param_type_desc_s {
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auth_param_type_t type;
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void *cookie;
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} auth_param_type_desc_t;
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/*
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* Store a pointer to the authentication parameter and its length
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*/
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typedef struct auth_param_data_desc_s {
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void *ptr;
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unsigned int len;
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} auth_param_data_desc_t;
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/*
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* Authentication parameter descriptor, including type and value
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*/
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typedef struct auth_param_desc_s {
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auth_param_type_desc_t *type_desc;
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auth_param_data_desc_t data;
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} auth_param_desc_t;
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/*
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* The method type defines how an image is authenticated
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*/
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typedef enum auth_method_type_enum {
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AUTH_METHOD_NONE = 0,
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AUTH_METHOD_HASH, /* Authenticate by hash matching */
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AUTH_METHOD_SIG, /* Authenticate by PK operation */
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AUTH_METHOD_NV_CTR, /* Authenticate by Non-Volatile Counter */
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AUTH_METHOD_NUM /* Number of methods */
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} auth_method_type_t;
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/*
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* Parameters for authentication by hash matching
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*/
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typedef struct auth_method_param_hash_s {
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auth_param_type_desc_t *data; /* Data to hash */
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auth_param_type_desc_t *hash; /* Hash to match with */
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} auth_method_param_hash_t;
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/*
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* Parameters for authentication by signature
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*/
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typedef struct auth_method_param_sig_s {
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auth_param_type_desc_t *pk; /* Public key */
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auth_param_type_desc_t *sig; /* Signature to check */
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auth_param_type_desc_t *alg; /* Signature algorithm */
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auth_param_type_desc_t *data; /* Data signed */
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} auth_method_param_sig_t;
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/*
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* Parameters for authentication by NV counter
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*/
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typedef struct auth_method_param_nv_ctr_s {
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auth_param_type_desc_t *cert_nv_ctr; /* NV counter in certificate */
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auth_param_type_desc_t *plat_nv_ctr; /* NV counter in platform */
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} auth_method_param_nv_ctr_t;
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/*
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* Authentication method descriptor
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*/
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typedef struct auth_method_desc_s {
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auth_method_type_t type;
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union {
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auth_method_param_hash_t hash;
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auth_method_param_sig_t sig;
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auth_method_param_nv_ctr_t nv_ctr;
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} param;
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} auth_method_desc_t;
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/*
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* Helper macro to define an authentication parameter type descriptor
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*/
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#define AUTH_PARAM_TYPE_DESC(_type, _cookie) \
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{ \
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.type = _type, \
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.cookie = (void *)_cookie \
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}
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/*
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* Helper macro to define an authentication parameter data descriptor
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*/
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#define AUTH_PARAM_DATA_DESC(_ptr, _len) \
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{ \
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.ptr = (void *)_ptr, \
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.len = (unsigned int)_len \
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}
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#endif /* __AUTH_COMMON_H__ */
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