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lib/libsecureboot/vepcr.c
- This file was added.
| Property | Old Value | New Value |
|---|---|---|
| svn:eol-style | null | native \ No newline at end of property |
| svn:keywords | null | FreeBSD=%H \ No newline at end of property |
| svn:mime-type | null | text/plain \ No newline at end of property |
| /*- | |||||
| * Copyright (c) 2018, Juniper Networks, Inc. | |||||
| * | |||||
| * Redistribution and use in source and binary forms, with or without | |||||
| * modification, are permitted provided that the following conditions | |||||
| * are met: | |||||
| * 1. Redistributions of source code must retain the above copyright | |||||
| * notice, this list of conditions and the following disclaimer. | |||||
| * 2. Redistributions in binary form must reproduce the above copyright | |||||
| * notice, this list of conditions and the following disclaimer in the | |||||
| * documentation and/or other materials provided with the distribution. | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |||||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |||||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |||||
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |||||
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |||||
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |||||
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |||||
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |||||
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |||||
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |||||
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |||||
| */ | |||||
| #include <sys/cdefs.h> | |||||
| __FBSDID("$FreeBSD$"); | |||||
| #include "libsecureboot-priv.h" | |||||
| /* | |||||
| * To support measured boot without putting a ton | |||||
| * of extra code in the loader, we just maintain | |||||
| * a hash of all the hashes we (attempt to) verify. | |||||
| * The loader can export this for kernel or rc script | |||||
| * to feed to a TPM pcr register - hence the name ve_pcr. | |||||
| * | |||||
| * NOTE: in the current standard the TPM pcr register size is for SHA1, | |||||
| * the fact that we provide a SHA256 hash should not matter | |||||
| * as long as we are consistent - it can be truncated or hashed | |||||
| * before feeding to TPM. | |||||
| */ | |||||
| static const br_hash_class *pcr_md = NULL; | |||||
| static br_hash_compat_context pcr_ctx; | |||||
| static size_t pcr_hlen = 0; | |||||
| /** | |||||
| * @brief initialize pcr context | |||||
| * | |||||
| * Real TPM registers only hold a SHA1 hash | |||||
| * but we use SHA256 | |||||
| */ | |||||
| void | |||||
| ve_pcr_init(void) | |||||
| { | |||||
| pcr_hlen = br_sha256_SIZE; | |||||
| pcr_md = &br_sha256_vtable; | |||||
| pcr_md->init(&pcr_ctx.vtable); | |||||
| } | |||||
| /** | |||||
| * @brief update pcr context | |||||
| */ | |||||
| void | |||||
| ve_pcr_update(unsigned char *data, size_t dlen) | |||||
| { | |||||
| if (pcr_md) | |||||
| pcr_md->update(&pcr_ctx.vtable, data, dlen); | |||||
| } | |||||
| /** | |||||
| * @brief get pcr result | |||||
| */ | |||||
| ssize_t | |||||
| ve_pcr_get(unsigned char *buf, size_t sz) | |||||
| { | |||||
| if (!pcr_md) | |||||
| return (-1); | |||||
| if (sz < pcr_hlen) | |||||
| return (-1); | |||||
| pcr_md->out(&pcr_ctx.vtable, buf); | |||||
| return (pcr_hlen); | |||||
| } | |||||