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bb782513017665df4a258c8e57f3fa14d327debb
xen/tools/vtpm_manager/manager/securestorage.c
T
kfraser@localhost.localdomain 6b900ffb50 [VTPM_Tools] Support for (non-local) Migration added. Local migration 
works provided that the hotplug scripts deliver the "suspend" before
the "resume," but this is not always true.
Signed-off-by: Vinnie Scarlata <vincent.r.scarlata@intel.com>
2006-07-10 15:38:49 +01:00

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// ===================================================================
//
// Copyright (c) 2005, Intel Corp.
// 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 name of Intel 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 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.
// ===================================================================
//
// securestorage.c
//
// Functions regarding securely storing DMI secrets.
//
// ==================================================================
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include "tcg.h"
#include "vtpm_manager.h"
#include "vtpmpriv.h"
#include "vtsp.h"
#include "bsg.h"
#include "crypto.h"
#include "hashtable.h"
#include "hashtable_itr.h"
#include "buffer.h"
#include "log.h"
TPM_RESULT envelope_encrypt(const buffer_t *inbuf,
CRYPTO_INFO *asymkey,
buffer_t *sealed_data) {
TPM_RESULT status = TPM_SUCCESS;
symkey_t symkey;
buffer_t data_cipher = NULL_BUF,
symkey_cipher = NULL_BUF;
UINT32 i;
struct pack_constbuf_t symkey_cipher32, data_cipher32;
vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Enveloping Input[%d]: 0x", buffer_len(inbuf));
for (i=0; i< buffer_len(inbuf); i++)
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", inbuf->bytes[i]);
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
// Generate a sym key and encrypt state with it
TPMTRY(TPM_ENCRYPT_ERROR, Crypto_symcrypto_genkey (&symkey) );
TPMTRY(TPM_ENCRYPT_ERROR, Crypto_symcrypto_encrypt (&symkey, inbuf, &data_cipher) );
// Encrypt symmetric key
TPMTRYRETURN( VTSP_Bind( asymkey,
&symkey.key,
&symkey_cipher) );
// Create output blob: symkey_size + symkey_cipher + state_cipher_size + state_cipher
symkey_cipher32.size = buffer_len(&symkey_cipher);
symkey_cipher32.data = symkey_cipher.bytes;
data_cipher32.size = buffer_len(&data_cipher);
data_cipher32.data = data_cipher.bytes;
TPMTRYRETURN( buffer_init(sealed_data, 2 * sizeof(UINT32) + symkey_cipher32.size + data_cipher32.size, NULL));
BSG_PackList(sealed_data->bytes, 2,
BSG_TPM_SIZE32_DATA, &symkey_cipher32,
BSG_TPM_SIZE32_DATA, &data_cipher32);
vtpmloginfo(VTPM_LOG_VTPM, "Saved %d bytes of E(symkey) + %d bytes of E(data)\n", buffer_len(&symkey_cipher), buffer_len(&data_cipher));
vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Enveloping Output[%d]: 0x", buffer_len(sealed_data));
for (i=0; i< buffer_len(sealed_data); i++)
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", sealed_data->bytes[i]);
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
goto egress;
abort_egress:
vtpmlogerror(VTPM_LOG_VTPM, "Failed to envelope encrypt\n.");
egress:
buffer_free ( &data_cipher);
buffer_free ( &symkey_cipher);
Crypto_symcrypto_freekey (&symkey);
return status;
}
TPM_RESULT envelope_decrypt(const buffer_t *cipher,
TCS_CONTEXT_HANDLE TCSContext,
TPM_HANDLE keyHandle,
const TPM_AUTHDATA *key_usage_auth,
buffer_t *unsealed_data) {
TPM_RESULT status = TPM_SUCCESS;
symkey_t symkey;
buffer_t data_cipher = NULL_BUF,
symkey_clear = NULL_BUF,
symkey_cipher = NULL_BUF;
struct pack_buf_t symkey_cipher32, data_cipher32;
int i;
memset(&symkey, 0, sizeof(symkey_t));
vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Envelope Decrypt Input[%d]: 0x", buffer_len(cipher) );
for (i=0; i< buffer_len(cipher); i++)
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", cipher->bytes[i]);
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
BSG_UnpackList(cipher->bytes, 2,
BSG_TPM_SIZE32_DATA, &symkey_cipher32,
BSG_TPM_SIZE32_DATA, &data_cipher32);
TPMTRYRETURN( buffer_init_alias_convert (&symkey_cipher,
symkey_cipher32.size,
symkey_cipher32.data) );
TPMTRYRETURN( buffer_init_alias_convert (&data_cipher,
data_cipher32.size,
data_cipher32.data) );
// Decrypt Symmetric Key
TPMTRYRETURN( VTSP_Unbind( TCSContext,
keyHandle,
&symkey_cipher,
key_usage_auth,
&symkey_clear,
&(vtpm_globals->keyAuth) ) );
// create symmetric key using saved bits
Crypto_symcrypto_initkey (&symkey, &symkey_clear);
// Decrypt State
TPMTRY(TPM_DECRYPT_ERROR, Crypto_symcrypto_decrypt (&symkey, &data_cipher, unsealed_data) );
vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Envelope Decrypte Output[%d]: 0x", buffer_len(unsealed_data));
for (i=0; i< buffer_len(unsealed_data); i++)
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", unsealed_data->bytes[i]);
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
goto egress;
abort_egress:
vtpmlogerror(VTPM_LOG_VTPM, "Failed to envelope decrypt data\n.");
egress:
buffer_free ( &data_cipher);
buffer_free ( &symkey_clear);
buffer_free ( &symkey_cipher);
Crypto_symcrypto_freekey (&symkey);
return status;
}
TPM_RESULT VTPM_Handle_Save_NVM(VTPM_DMI_RESOURCE *myDMI,
const buffer_t *inbuf,
buffer_t *outbuf) {
TPM_RESULT status = TPM_SUCCESS;
int fh;
long bytes_written;
buffer_t sealed_NVM = NULL_BUF;
vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Saving %d bytes of NVM.\n", buffer_len(inbuf));
TPMTRYRETURN( envelope_encrypt(inbuf,
&vtpm_globals->storageKey,
&sealed_NVM) );
// Write sealed blob off disk from NVMLocation
// TODO: How to properly return from these. Do we care if we return failure
// after writing the file? We can't get the old one back.
// TODO: Backup old file and try and recover that way.
fh = open(myDMI->NVMLocation, O_WRONLY | O_CREAT, S_IREAD | S_IWRITE);
if ( (bytes_written = write(fh, sealed_NVM.bytes, buffer_len(&sealed_NVM) ) != (long) buffer_len(&sealed_NVM))) {
vtpmlogerror(VTPM_LOG_VTPM, "We just overwrote a DMI_NVM and failed to finish. %ld/%ld bytes.\n", bytes_written, (long)buffer_len(&sealed_NVM));
status = TPM_IOERROR;
goto abort_egress;
}
close(fh);
Crypto_SHA1Full (sealed_NVM.bytes, buffer_len(&sealed_NVM), (BYTE *) &myDMI->NVM_measurement);
goto egress;
abort_egress:
vtpmlogerror(VTPM_LOG_VTPM, "Failed to save NVM\n.");
egress:
buffer_free(&sealed_NVM);
return status;
}
/* Expected Params: inbuf = null, outbuf = sealed blob size, sealed blob.*/
TPM_RESULT VTPM_Handle_Load_NVM(VTPM_DMI_RESOURCE *myDMI,
const buffer_t *inbuf,
buffer_t *outbuf) {
TPM_RESULT status = TPM_SUCCESS;
buffer_t sealed_NVM = NULL_BUF;
long fh_size;
int fh, stat_ret, i;
struct stat file_stat;
TPM_DIGEST sealedNVMHash;
if (myDMI->NVMLocation == NULL) {
vtpmlogerror(VTPM_LOG_VTPM, "Unable to load NVM because the file name NULL.\n");
status = TPM_AUTHFAIL;
goto abort_egress;
}
//Read sealed blob off disk from NVMLocation
fh = open(myDMI->NVMLocation, O_RDONLY);
stat_ret = fstat(fh, &file_stat);
if (stat_ret == 0)
fh_size = file_stat.st_size;
else {
status = TPM_IOERROR;
goto abort_egress;
}
TPMTRYRETURN( buffer_init( &sealed_NVM, fh_size, NULL) );
if (read(fh, sealed_NVM.bytes, buffer_len(&sealed_NVM)) != fh_size) {
status = TPM_IOERROR;
goto abort_egress;
}
close(fh);
vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Load_NVMing[%d],\n", buffer_len(&sealed_NVM));
Crypto_SHA1Full(sealed_NVM.bytes, buffer_len(&sealed_NVM), (BYTE *) &sealedNVMHash);
// Verify measurement of sealed blob.
if (memcmp(&sealedNVMHash, &myDMI->NVM_measurement, sizeof(TPM_DIGEST)) ) {
vtpmlogerror(VTPM_LOG_VTPM, "VTPM LoadNVM NVM measurement check failed.\n");
vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Correct hash: ");
for (i=0; i< sizeof(TPM_DIGEST); i++)
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", ((BYTE*)&myDMI->NVM_measurement)[i]);
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Measured hash: ");
for (i=0; i< sizeof(TPM_DIGEST); i++)
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", ((BYTE*)&sealedNVMHash)[i]);
vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
status = TPM_AUTHFAIL;
goto abort_egress;
}
TPMTRYRETURN( envelope_decrypt(&sealed_NVM,
myDMI->TCSContext,
vtpm_globals->storageKeyHandle,
(const TPM_AUTHDATA*)&vtpm_globals->storage_key_usage_auth,
outbuf) );
goto egress;
abort_egress:
vtpmlogerror(VTPM_LOG_VTPM, "Failed to load NVM\n.");
egress:
buffer_free( &sealed_NVM );
return status;
}
TPM_RESULT VTPM_SaveManagerData(void) {
TPM_RESULT status=TPM_SUCCESS;
int fh, dmis=-1;
BYTE *flat_boot_key=NULL, *flat_dmis=NULL, *flat_enc=NULL;
buffer_t clear_flat_global=NULL_BUF, enc_flat_global=NULL_BUF;
UINT32 storageKeySize = buffer_len(&vtpm_globals->storageKeyWrap);
UINT32 bootKeySize = buffer_len(&vtpm_globals->bootKeyWrap);
struct pack_buf_t storage_key_pack = {storageKeySize, vtpm_globals->storageKeyWrap.bytes};
struct pack_buf_t boot_key_pack = {bootKeySize, vtpm_globals->bootKeyWrap.bytes};
BYTE vtpm_manager_gen = VTPM_MANAGER_GEN;
struct hashtable_itr *dmi_itr;
VTPM_DMI_RESOURCE *dmi_res;
UINT32 boot_key_size = 0, flat_dmis_size = 0;
// Initially fill these with buffer sizes for each data type. Later fill
// in actual size, once flattened.
boot_key_size = sizeof(UINT32) + // bootkeysize
bootKeySize; // boot key
TPMTRYRETURN(buffer_init(&clear_flat_global,sizeof(BYTE) + // manager version
3*sizeof(TPM_DIGEST) + // Auths
sizeof(UINT32) +// storagekeysize
storageKeySize, NULL) ); // storage key
flat_boot_key = (BYTE *) malloc( boot_key_size );
flat_enc = (BYTE *) malloc( sizeof(UINT32) );
boot_key_size = BSG_PackList(flat_boot_key, 1,
BSG_TPM_SIZE32_DATA, &boot_key_pack);
BSG_PackList(clear_flat_global.bytes, 4,
BSG_TYPE_BYTE, &vtpm_manager_gen,
BSG_TPM_AUTHDATA, &vtpm_globals->owner_usage_auth,
BSG_TPM_SECRET, &vtpm_globals->storage_key_usage_auth,
BSG_TPM_SIZE32_DATA, &storage_key_pack);
TPMTRYRETURN(envelope_encrypt(&clear_flat_global,
&vtpm_globals->bootKey,
&enc_flat_global) );
BSG_PackConst(buffer_len(&enc_flat_global), 4, flat_enc);
// Per DMI values to be saved (if any exit)
if (hashtable_count(vtpm_globals->dmi_map) > 1) {
flat_dmis = (BYTE *) malloc(
(hashtable_count(vtpm_globals->dmi_map) - 1) * // num DMIS (-1 for Dom0)
(sizeof(UINT32) +sizeof(BYTE) + 2*sizeof(TPM_DIGEST)) ); // Per DMI info
dmi_itr = hashtable_iterator(vtpm_globals->dmi_map);
do {
dmi_res = (VTPM_DMI_RESOURCE *) hashtable_iterator_value(dmi_itr);
dmis++;
// No need to save dmi0.
if (dmi_res->dmi_id == 0)
continue;
flat_dmis_size += BSG_PackList( flat_dmis + flat_dmis_size, 4,
BSG_TYPE_UINT32, &dmi_res->dmi_id,
BSG_TYPE_BYTE, &dmi_res->dmi_type,
BSG_TPM_DIGEST, &dmi_res->NVM_measurement,
BSG_TPM_DIGEST, &dmi_res->DMI_measurement);
} while (hashtable_iterator_advance(dmi_itr));
}
fh = open(STATE_FILE, O_WRONLY | O_CREAT, S_IREAD | S_IWRITE);
if (fh == -1) {
vtpmlogerror(VTPM_LOG_VTPM, "Unable to open %s file for write.\n", STATE_FILE);
status = TPM_IOERROR;
goto abort_egress;
}
if ( ( write(fh, flat_boot_key, boot_key_size) != boot_key_size ) ||
( write(fh, flat_enc, sizeof(UINT32)) != sizeof(UINT32) ) ||
( write(fh, enc_flat_global.bytes, buffer_len(&enc_flat_global)) != buffer_len(&enc_flat_global) ) ||
( write(fh, flat_dmis, flat_dmis_size) != flat_dmis_size ) ) {
vtpmlogerror(VTPM_LOG_VTPM, "Failed to completely write service data.\n");
status = TPM_IOERROR;
goto abort_egress;
}
goto egress;
abort_egress:
egress:
free(flat_boot_key);
free(flat_enc);
buffer_free(&enc_flat_global);
free(flat_dmis);
close(fh);
vtpmloginfo(VTPM_LOG_VTPM, "Saved VTPM Manager state (status = %d, dmis = %d)\n", (int) status, dmis);
return status;
}
TPM_RESULT VTPM_LoadManagerData(void) {
TPM_RESULT status=TPM_SUCCESS;
int fh, stat_ret, dmis=0;
long fh_size = 0, step_size;
BYTE *flat_table=NULL;
buffer_t unsealed_data, enc_table_abuf;
struct pack_buf_t storage_key_pack, boot_key_pack;
UINT32 *dmi_id_key, enc_size;
BYTE vtpm_manager_gen;
VTPM_DMI_RESOURCE *dmi_res;
UINT32 dmi_id;
BYTE dmi_type;
struct stat file_stat;
TPM_HANDLE boot_key_handle;
TPM_AUTHDATA boot_usage_auth;
memset(&boot_usage_auth, 0, sizeof(TPM_AUTHDATA));
fh = open(STATE_FILE, O_RDONLY );
stat_ret = fstat(fh, &file_stat);
if (stat_ret == 0)
fh_size = file_stat.st_size;
else {
status = TPM_IOERROR;
goto abort_egress;
}
flat_table = (BYTE *) malloc(fh_size);
if ((long) read(fh, flat_table, fh_size) != fh_size ) {
status = TPM_IOERROR;
goto abort_egress;
}
// Read Boot Key
step_size = BSG_UnpackList( flat_table, 2,
BSG_TPM_SIZE32_DATA, &boot_key_pack,
BSG_TYPE_UINT32, &enc_size);
TPMTRYRETURN(buffer_init(&vtpm_globals->bootKeyWrap, 0, 0) );
TPMTRYRETURN(buffer_init_alias_convert(&enc_table_abuf, enc_size, flat_table + step_size) );
TPMTRYRETURN(buffer_append_raw(&vtpm_globals->bootKeyWrap, boot_key_pack.size, boot_key_pack.data) );
//Load Boot Key
TPMTRYRETURN( VTSP_LoadKey( vtpm_globals->manager_tcs_handle,
TPM_SRK_KEYHANDLE,
&vtpm_globals->bootKeyWrap,
&SRK_AUTH,
&boot_key_handle,
&vtpm_globals->keyAuth,
&vtpm_globals->bootKey,
FALSE) );
TPMTRYRETURN( envelope_decrypt(&enc_table_abuf,
vtpm_globals->manager_tcs_handle,
boot_key_handle,
(const TPM_AUTHDATA*) &boot_usage_auth,
&unsealed_data) );
step_size += enc_size;
if (*unsealed_data.bytes != VTPM_MANAGER_GEN) {
// Once there is more than one gen, this will include some compatability stuff
vtpmlogerror(VTPM_LOG_VTPM, "Warning: Manager Data file is gen %d, which this manager is gen %d.\n", vtpm_manager_gen, VTPM_MANAGER_GEN);
}
// Global Values needing to be saved
BSG_UnpackList( unsealed_data.bytes, 4,
BSG_TYPE_BYTE, &vtpm_manager_gen,
BSG_TPM_AUTHDATA, &vtpm_globals->owner_usage_auth,
BSG_TPM_SECRET, &vtpm_globals->storage_key_usage_auth,
BSG_TPM_SIZE32_DATA, &storage_key_pack);
TPMTRYRETURN(buffer_init(&vtpm_globals->storageKeyWrap, 0, 0) );
TPMTRYRETURN(buffer_append_raw(&vtpm_globals->storageKeyWrap, storage_key_pack.size, storage_key_pack.data) );
// Per DMI values to be saved
while ( step_size < fh_size ){
if (fh_size - step_size < (long) (sizeof(UINT32) + sizeof(BYTE) + 2*sizeof(TPM_DIGEST))) {
vtpmlogerror(VTPM_LOG_VTPM, "Encountered %ld extra bytes at end of manager state.\n", fh_size-step_size);
step_size = fh_size;
} else {
step_size += BSG_UnpackList(flat_table + step_size, 2,
BSG_TYPE_UINT32, &dmi_id,
BSG_TYPE_BYTE, &dmi_type);
//TODO: Try and gracefully recover from problems.
TPMTRYRETURN(init_dmi(dmi_id, dmi_type, &dmi_res) );
dmis++;
step_size += BSG_UnpackList(flat_table + step_size, 2,
BSG_TPM_DIGEST, &dmi_res->NVM_measurement,
BSG_TPM_DIGEST, &dmi_res->DMI_measurement);
}
}
vtpmloginfo(VTPM_LOG_VTPM, "Loaded saved state (dmis = %d).\n", dmis);
goto egress;
abort_egress:
vtpmlogerror(VTPM_LOG_VTPM, "Failed to load service data with error = %s\n", tpm_get_error_name(status));
egress:
free(flat_table);
close(fh);
// TODO: Could be nice and evict BootKey. (Need to add EvictKey to VTSP.
return status;
}
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