72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
/*
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* Copyright (c) 2016, 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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#include <assert.h>
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#include <auth/auth_mod.h>
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#include <platform.h>
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#include <platform_oid.h>
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#include <string.h>
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/*
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* Store a new non-volatile counter value. This implementation
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* only allows updating of the platform's Trusted NV counter when a
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* certificate protected by the Trusted NV counter is signed with
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* the ROT key. This avoids a compromised secondary certificate from
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* updating the platform's Trusted NV counter, which could lead to the
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* platform becoming unusable. The function is suitable for all TBBR
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* compliant platforms.
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*
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* Return: 0 = success, Otherwise = error
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*/
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int plat_set_nv_ctr2(void *cookie, const auth_img_desc_t *img_desc,
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unsigned int nv_ctr)
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{
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int trusted_nv_ctr;
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assert(cookie != NULL);
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assert(img_desc != NULL);
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trusted_nv_ctr = strcmp(cookie, TRUSTED_FW_NVCOUNTER_OID) == 0;
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/*
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* Only update the Trusted NV Counter if the certificate
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* has been signed with the ROT key. Non Trusted NV counter
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* updates are unconditional.
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*/
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if (!trusted_nv_ctr || img_desc->parent == NULL)
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return plat_set_nv_ctr(cookie, nv_ctr);
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/*
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* Trusted certificates not signed with the ROT key are not
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* allowed to update the Trusted NV Counter.
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*/
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return 1;
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}
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