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Diffstat (limited to '')
| -rw-r--r-- | src/tpm2/Volatile.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/src/tpm2/Volatile.c b/src/tpm2/Volatile.c new file mode 100644 index 0000000..ff15c7f --- /dev/null +++ b/src/tpm2/Volatile.c @@ -0,0 +1,119 @@ +/********************************************************************************/ +/* */ +/* Marshalling and unmarshalling of state */ +/* Written by Stefan Berger */ +/* IBM Thomas J. Watson Research Center */ +/* */ +/* (c) Copyright IBM Corporation 2017,2018. */ +/* */ +/* All rights reserved. */ +/* */ +/* Redistribution and use in source and binary forms, with or without */ +/* modification, are permitted provided that the following conditions are */ +/* met: */ +/* */ +/* Redistributions of source code must retain the above copyright notice, */ +/* this list of conditions and the following disclaimer. */ +/* */ +/* 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. */ +/* */ +/* Neither the names of the IBM Corporation nor the names of its */ +/* contributors may be used to endorse or promote products derived from */ +/* this software without specific prior written permission. */ +/* */ +/* 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 */ +/* HOLDER 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. */ +/********************************************************************************/ + +#if defined __FreeBSD__ || defined __DragonFly__ +# include <sys/endian.h> +#elif defined __APPLE__ +# include <libkern/OSByteOrder.h> +#else +# include <endian.h> +#endif +#include <string.h> + +#include "config.h" + +#include "assert.h" +#include "NVMarshal.h" +#include "Volatile.h" + +#define TPM_HAVE_TPM2_DECLARATIONS +#include "tpm_library_intern.h" + +TPM_RC +VolatileState_Load(BYTE **buffer, INT32 *size) +{ + TPM_RC rc = TPM_RC_SUCCESS; + BYTE hash[SHA1_DIGEST_SIZE], acthash[SHA1_DIGEST_SIZE]; + UINT16 hashAlg = TPM_ALG_SHA1; + + if (rc == TPM_RC_SUCCESS) { + if ((UINT32)*size < sizeof(hash)) + return TPM_RC_INSUFFICIENT; + + CryptHashBlock(hashAlg, *size - sizeof(hash), *buffer, + sizeof(acthash), acthash); + rc = VolatileState_Unmarshal(buffer, size); + /* specific error has already been reported */ + } + + if (rc == TPM_RC_SUCCESS) { + /* + * advance pointer towards hash if we have a later version of + * the state that has extra data we didn't read + */ + if (*size > 0 && (UINT32)*size > sizeof(hash)) { + *buffer += *size - sizeof(hash); + *size = sizeof(hash); + } + rc = Array_Unmarshal(hash, sizeof(hash), buffer, size); + if (rc != TPM_RC_SUCCESS) + TPMLIB_LogTPM2Error("Error unmarshalling volatile state hash: " + "0x%02x\n", rc); + } + + if (rc == TPM_RC_SUCCESS) { + if (memcmp(acthash, hash, sizeof(hash))) { + rc = TPM_RC_HASH; + TPMLIB_LogTPM2Error("Volatile state checksum error: 0x%02x\n", + rc); + } + } + + if (rc != TPM_RC_SUCCESS) + g_inFailureMode = TRUE; + + return rc; +} + +UINT16 +VolatileState_Save(BYTE **buffer, INT32 *size) +{ + UINT16 written; + const BYTE *start; + BYTE hash[SHA1_DIGEST_SIZE]; + TPM_ALG_ID hashAlg = TPM_ALG_SHA1; + + start = *buffer; + written = VolatileState_Marshal(buffer, size); + + /* append the checksum */ + CryptHashBlock(hashAlg, written, start, sizeof(hash), hash); + written += Array_Marshal(hash, sizeof(hash), buffer, size); + + return written; +} |