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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [VTPM v5 1/7] add vtpm-stubdom code
Add the code base for vtpm-stubdom to the stubdom
heirarchy. Makefile changes in later patch.
Signed-off-by: Matthew Fioravante <matthew.fioravante@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
stubdom/vtpm/Makefile | 37 +++++
stubdom/vtpm/minios.cfg | 14 ++
stubdom/vtpm/vtpm.c | 404 ++++++++++++++++++++++++++++++++++++++++++++++
stubdom/vtpm/vtpm.h | 36 +++++
stubdom/vtpm/vtpm_cmd.c | 256 +++++++++++++++++++++++++++++
stubdom/vtpm/vtpm_cmd.h | 31 ++++
stubdom/vtpm/vtpm_pcrs.c | 43 +++++
stubdom/vtpm/vtpm_pcrs.h | 53 ++++++
stubdom/vtpm/vtpmblk.c | 307 +++++++++++++++++++++++++++++++++++
stubdom/vtpm/vtpmblk.h | 31 ++++
10 files changed, 1212 insertions(+)
create mode 100644 stubdom/vtpm/Makefile
create mode 100644 stubdom/vtpm/minios.cfg
create mode 100644 stubdom/vtpm/vtpm.c
create mode 100644 stubdom/vtpm/vtpm.h
create mode 100644 stubdom/vtpm/vtpm_cmd.c
create mode 100644 stubdom/vtpm/vtpm_cmd.h
create mode 100644 stubdom/vtpm/vtpm_pcrs.c
create mode 100644 stubdom/vtpm/vtpm_pcrs.h
create mode 100644 stubdom/vtpm/vtpmblk.c
create mode 100644 stubdom/vtpm/vtpmblk.h
diff --git a/stubdom/vtpm/Makefile b/stubdom/vtpm/Makefile
new file mode 100644
index 0000000..686c0ea
--- /dev/null
+++ b/stubdom/vtpm/Makefile
@@ -0,0 +1,37 @@
+# Copyright (c) 2010-2012 United States Government, as represented by
+# the Secretary of Defense. All rights reserved.
+#
+# THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+# ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+# INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+# DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+# SOFTWARE.
+#
+
+XEN_ROOT=../..
+
+PSSL_DIR=../polarssl-$(XEN_TARGET_ARCH)/library
+PSSL_OBJS=aes.o sha1.o entropy.o ctr_drbg.o sha4.o
+
+TARGET=vtpm.a
+OBJS=vtpm.o vtpm_cmd.o vtpmblk.o vtpm_pcrs.o
+
+
+CPPFLAGS+=-I../tpm_emulator-$(XEN_TARGET_ARCH)/build
+CPPFLAGS+=-I../tpm_emulator-$(XEN_TARGET_ARCH)/tpm
+CPPFLAGS+=-I../tpm_emulator-$(XEN_TARGET_ARCH)/crypto
+CPPFLAGS+=-I../tpm_emulator-$(XEN_TARGET_ARCH)
+
+$(TARGET): $(OBJS)
+ ar -cr $@ $(OBJS) $(TPMEMU_OBJS) $(foreach
obj,$(PSSL_OBJS),$(PSSL_DIR)/$(obj))
+
+$(OBJS): vtpm_manager.h
+
+vtpm_manager.h:
+ ln -s ../vtpmmgr/vtpm_manager.h vtpm_manager.h
+
+clean:
+ -rm $(TARGET) $(OBJS) vtpm_manager.h
+
+.PHONY: clean
diff --git a/stubdom/vtpm/minios.cfg b/stubdom/vtpm/minios.cfg
new file mode 100644
index 0000000..31652ee
--- /dev/null
+++ b/stubdom/vtpm/minios.cfg
@@ -0,0 +1,14 @@
+CONFIG_TPMFRONT=y
+CONFIG_TPM_TIS=n
+CONFIG_TPMBACK=y
+CONFIG_START_NETWORK=n
+CONFIG_TEST=n
+CONFIG_PCIFRONT=n
+CONFIG_BLKFRONT=y
+CONFIG_NETFRONT=n
+CONFIG_FBFRONT=n
+CONFIG_KBDFRONT=n
+CONFIG_CONSFRONT=n
+CONFIG_XENBUS=y
+CONFIG_LWIP=n
+CONFIG_XC=n
diff --git a/stubdom/vtpm/vtpm.c b/stubdom/vtpm/vtpm.c
new file mode 100644
index 0000000..71aef78
--- /dev/null
+++ b/stubdom/vtpm/vtpm.c
@@ -0,0 +1,404 @@
+/*
+ * Copyright (c) 2010-2012 United States Government, as represented by
+ * the Secretary of Defense. All rights reserved.
+ *
+ * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+ * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+ * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+ * SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <syslog.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <xen/xen.h>
+#include <tpmback.h>
+#include <tpmfront.h>
+
+#include <polarssl/entropy.h>
+#include <polarssl/ctr_drbg.h>
+
+#include "tpm/tpm_emulator_extern.h"
+#include "tpm/tpm_marshalling.h"
+#include "vtpm.h"
+#include "vtpm_cmd.h"
+#include "vtpm_pcrs.h"
+#include "vtpmblk.h"
+
+#define TPM_LOG_INFO LOG_INFO
+#define TPM_LOG_ERROR LOG_ERR
+#define TPM_LOG_DEBUG LOG_DEBUG
+
+/* Global commandline options - default values */
+struct Opt_args opt_args = {
+ .startup = ST_CLEAR,
+ .loglevel = TPM_LOG_INFO,
+ .hwinitpcrs = VTPM_PCRNONE,
+ .tpmconf = 0,
+ .enable_maint_cmds = false,
+};
+
+static uint32_t badords[32];
+static unsigned int n_badords = 0;
+
+entropy_context entropy;
+ctr_drbg_context ctr_drbg;
+
+struct tpmfront_dev* tpmfront_dev;
+
+void vtpm_get_extern_random_bytes(void *buf, size_t nbytes)
+{
+ ctr_drbg_random(&ctr_drbg, buf, nbytes);
+}
+
+int vtpm_read_from_file(uint8_t **data, size_t *data_length) {
+ return read_vtpmblk(tpmfront_dev, data, data_length);
+}
+
+int vtpm_write_to_file(uint8_t *data, size_t data_length) {
+ return write_vtpmblk(tpmfront_dev, data, data_length);
+}
+
+int vtpm_extern_init_fake(void) {
+ return 0;
+}
+
+void vtpm_extern_release_fake(void) {
+}
+
+
+void vtpm_log(int priority, const char *fmt, ...)
+{
+ if(opt_args.loglevel >= priority) {
+ va_list v;
+ va_start(v, fmt);
+ vprintf(fmt, v);
+ va_end(v);
+ }
+}
+
+static uint64_t vtpm_get_ticks(void)
+{
+ static uint64_t old_t = 0;
+ uint64_t new_t, res_t;
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ new_t = (uint64_t)tv.tv_sec * 1000000 + (uint64_t)tv.tv_usec;
+ res_t = (old_t > 0) ? new_t - old_t : 0;
+ old_t = new_t;
+ return res_t;
+}
+
+
+static int tpm_entropy_source(void* dummy, unsigned char* data, size_t len,
size_t* olen) {
+ UINT32 sz = len;
+ TPM_RESULT rc = VTPM_GetRandom(tpmfront_dev, data, &sz);
+ *olen = sz;
+ return rc == TPM_SUCCESS ? 0 : POLARSSL_ERR_ENTROPY_SOURCE_FAILED;
+}
+
+int init_random(void) {
+ /* Initialize the rng */
+ entropy_init(&entropy);
+ entropy_add_source(&entropy, tpm_entropy_source, NULL, 0);
+ entropy_gather(&entropy);
+ ctr_drbg_init(&ctr_drbg, entropy_func, &entropy, NULL, 0);
+ ctr_drbg_set_prediction_resistance( &ctr_drbg, CTR_DRBG_PR_OFF );
+
+ return 0;
+}
+
+int check_ordinal(tpmcmd_t* tpmcmd) {
+ TPM_COMMAND_CODE ord;
+ UINT32 len = 4;
+ BYTE* ptr;
+ unsigned int i;
+
+ if(tpmcmd->req_len < 10) {
+ return true;
+ }
+
+ ptr = tpmcmd->req + 6;
+ tpm_unmarshal_UINT32(&ptr, &len, &ord);
+
+ for(i = 0; i < n_badords; ++i) {
+ if(ord == badords[i]) {
+ error("Disabled command ordinal (%" PRIu32") requested!\n");
+ return false;
+ }
+ }
+ return true;
+}
+
+static void main_loop(void) {
+ tpmcmd_t* tpmcmd = NULL;
+ domid_t domid; /* Domid of frontend */
+ unsigned int handle; /* handle of frontend */
+ int res = -1;
+
+ info("VTPM Initializing\n");
+
+ /* Set required tpm config args */
+ opt_args.tpmconf |= TPM_CONF_STRONG_PERSISTENCE;
+ opt_args.tpmconf &= ~TPM_CONF_USE_INTERNAL_PRNG;
+ opt_args.tpmconf |= TPM_CONF_GENERATE_EK;
+ opt_args.tpmconf |= TPM_CONF_GENERATE_SEED_DAA;
+
+ /* Initialize the emulator */
+ tpm_emulator_init(opt_args.startup, opt_args.tpmconf);
+
+ /* Initialize any requested PCRs with hardware TPM values */
+ if(vtpm_initialize_hw_pcrs(tpmfront_dev, opt_args.hwinitpcrs) !=
TPM_SUCCESS) {
+ error("Failed to initialize PCRs with hardware TPM values");
+ goto abort_postpcrs;
+ }
+
+ /* Wait for the frontend domain to connect */
+ info("Waiting for frontend domain to connect..");
+ if(tpmback_wait_for_frontend_connect(&domid, &handle) == 0) {
+ info("VTPM attached to Frontend %u/%u", (unsigned int) domid, handle);
+ } else {
+ error("Unable to attach to a frontend");
+ }
+
+ tpmcmd = tpmback_req(domid, handle);
+ while(tpmcmd) {
+ /* Handle the request */
+ if(tpmcmd->req_len) {
+ tpmcmd->resp = NULL;
+ tpmcmd->resp_len = 0;
+
+ /* First check for disabled ordinals */
+ if(!check_ordinal(tpmcmd)) {
+ create_error_response(tpmcmd, TPM_BAD_ORDINAL);
+ }
+ /* If not disabled, do the command */
+ else {
+ if((res = tpm_handle_command(tpmcmd->req, tpmcmd->req_len,
&tpmcmd->resp, &tpmcmd->resp_len)) != 0) {
+ error("tpm_handle_command() failed");
+ create_error_response(tpmcmd, TPM_FAIL);
+ }
+ }
+ }
+
+ /* Send the response */
+ tpmback_resp(tpmcmd);
+
+ /* Wait for the next request */
+ tpmcmd = tpmback_req(domid, handle);
+
+ }
+
+abort_postpcrs:
+ info("VTPM Shutting down\n");
+
+ tpm_emulator_shutdown();
+}
+
+int parse_cmd_line(int argc, char** argv)
+{
+ char sval[25];
+ char* logstr = NULL;
+ /* Parse the command strings */
+ for(unsigned int i = 1; i < argc; ++i) {
+ if (sscanf(argv[i], "loglevel=%25s", sval) == 1){
+ if (!strcmp(sval, "debug")) {
+ opt_args.loglevel = TPM_LOG_DEBUG;
+ logstr = "debug";
+ }
+ else if (!strcmp(sval, "info")) {
+ logstr = "info";
+ opt_args.loglevel = TPM_LOG_INFO;
+ }
+ else if (!strcmp(sval, "error")) {
+ logstr = "error";
+ opt_args.loglevel = TPM_LOG_ERROR;
+ }
+ }
+ else if (!strcmp(argv[i], "clear")) {
+ opt_args.startup = ST_CLEAR;
+ }
+ else if (!strcmp(argv[i], "save")) {
+ opt_args.startup = ST_SAVE;
+ }
+ else if (!strcmp(argv[i], "deactivated")) {
+ opt_args.startup = ST_DEACTIVATED;
+ }
+ else if (!strncmp(argv[i], "maintcmds=", 10)) {
+ if(!strcmp(argv[i] + 10, "1")) {
+ opt_args.enable_maint_cmds = true;
+ } else if(!strcmp(argv[i] + 10, "0")) {
+ opt_args.enable_maint_cmds = false;
+ }
+ }
+ else if(!strncmp(argv[i], "hwinitpcr=", 10)) {
+ char *pch = argv[i] + 10;
+ unsigned int v1, v2;
+ pch = strtok(pch, ",");
+ while(pch != NULL) {
+ if(!strcmp(pch, "all")) {
+ //Set all
+ opt_args.hwinitpcrs = VTPM_PCRALL;
+ } else if(!strcmp(pch, "none")) {
+ //Set none
+ opt_args.hwinitpcrs = VTPM_PCRNONE;
+ } else if(sscanf(pch, "%u", &v1) == 1) {
+ //Set one
+ if(v1 >= TPM_NUM_PCR) {
+ error("hwinitpcr error: Invalid PCR index %u", v1);
+ return -1;
+ }
+ opt_args.hwinitpcrs |= (1 << v1);
+ } else if(sscanf(pch, "%u-%u", &v1, &v2) == 2) {
+ //Set range
+ if(v1 >= TPM_NUM_PCR) {
+ error("hwinitpcr error: Invalid PCR index %u", v1);
+ return -1;
+ }
+ if(v2 >= TPM_NUM_PCR) {
+ error("hwinitpcr error: Invalid PCR index %u", v1);
+ return -1;
+ }
+ if(v2 < v1) {
+ unsigned tp = v1;
+ v1 = v2;
+ v2 = tp;
+ }
+ for(unsigned int i = v1; i <= v2; ++i) {
+ opt_args.hwinitpcrs |= (1 << i);
+ }
+ } else {
+ error("hwintipcr error: Invalid PCR specification : %s", pch);
+ return -1;
+ }
+ pch = strtok(NULL, ",");
+ }
+ }
+ else {
+ error("Invalid command line option `%s'", argv[i]);
+ }
+
+ }
+
+ /* Check Errors and print results */
+ switch(opt_args.startup) {
+ case ST_CLEAR:
+ info("Startup mode is `clear'");
+ break;
+ case ST_SAVE:
+ info("Startup mode is `save'");
+ break;
+ case ST_DEACTIVATED:
+ info("Startup mode is `deactivated'");
+ break;
+ default:
+ error("Invalid startup mode %d", opt_args.startup);
+ return -1;
+ }
+
+ if(opt_args.hwinitpcrs & (VTPM_PCRALL))
+ {
+ char pcrstr[1024];
+ char* ptr = pcrstr;
+
+ pcrstr[0] = '\0';
+ info("The following PCRs will be initialized with values from the
hardware TPM:");
+ for(unsigned int i = 0; i < TPM_NUM_PCR; ++i) {
+ if(opt_args.hwinitpcrs & (1 << i)) {
+ ptr += sprintf(ptr, "%u, ", i);
+ }
+ }
+ /* get rid of the last comma if any numbers were printed */
+ *(ptr -2) = '\0';
+
+ info("\t%s", pcrstr);
+ } else {
+ info("All PCRs initialized to default values");
+ }
+
+ if(!opt_args.enable_maint_cmds) {
+ info("TPM Maintenance Commands disabled");
+ badords[n_badords++] = TPM_ORD_CreateMaintenanceArchive;
+ badords[n_badords++] = TPM_ORD_LoadMaintenanceArchive;
+ badords[n_badords++] = TPM_ORD_KillMaintenanceFeature;
+ badords[n_badords++] = TPM_ORD_LoadManuMaintPub;
+ badords[n_badords++] = TPM_ORD_ReadManuMaintPub;
+ } else {
+ info("TPM Maintenance Commands enabled");
+ }
+
+ info("Log level set to %s", logstr);
+
+ return 0;
+}
+
+void cleanup_opt_args(void) {
+}
+
+int main(int argc, char **argv)
+{
+ //FIXME: initializing blkfront without this sleep causes the domain to
crash on boot
+ sleep(2);
+
+ /* Setup extern function pointers */
+ tpm_extern_init = vtpm_extern_init_fake;
+ tpm_extern_release = vtpm_extern_release_fake;
+ tpm_malloc = malloc;
+ tpm_free = free;
+ tpm_log = vtpm_log;
+ tpm_get_ticks = vtpm_get_ticks;
+ tpm_get_extern_random_bytes = vtpm_get_extern_random_bytes;
+ tpm_write_to_storage = vtpm_write_to_file;
+ tpm_read_from_storage = vtpm_read_from_file;
+
+ info("starting TPM Emulator (1.2.%d.%d-%d)", VERSION_MAJOR, VERSION_MINOR,
VERSION_BUILD);
+ if(parse_cmd_line(argc, argv)) {
+ error("Error parsing commandline\n");
+ return -1;
+ }
+
+ /* Initialize devices */
+ init_tpmback();
+ if((tpmfront_dev = init_tpmfront(NULL)) == NULL) {
+ error("Unable to initialize tpmfront device");
+ goto abort_posttpmfront;
+ }
+
+ /* Seed the RNG with entropy from hardware TPM */
+ if(init_random()) {
+ error("Unable to initialize RNG");
+ goto abort_postrng;
+ }
+
+ /* Initialize blkfront device */
+ if(init_vtpmblk(tpmfront_dev)) {
+ error("Unable to initialize Blkfront persistent storage");
+ goto abort_postvtpmblk;
+ }
+
+ /* Run main loop */
+ main_loop();
+
+ /* Shutdown blkfront */
+ shutdown_vtpmblk();
+abort_postvtpmblk:
+abort_postrng:
+
+ /* Close devices */
+ shutdown_tpmfront(tpmfront_dev);
+abort_posttpmfront:
+ shutdown_tpmback();
+
+ cleanup_opt_args();
+
+ return 0;
+}
diff --git a/stubdom/vtpm/vtpm.h b/stubdom/vtpm/vtpm.h
new file mode 100644
index 0000000..5919e44
--- /dev/null
+++ b/stubdom/vtpm/vtpm.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2010-2012 United States Government, as represented by
+ * the Secretary of Defense. All rights reserved.
+ *
+ * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+ * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+ * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+ * SOFTWARE.
+ */
+
+#ifndef VTPM_H
+#define VTPM_H
+
+#include <stdbool.h>
+
+/* For testing */
+#define VERS_CMD
"\x00\xC1\x00\x00\x00\x16\x00\x00\x00\x65\x00\x00\x00\x05\x00\x00\x00\x04\x00\x00\x01\x03"
+#define VERS_CMD_LEN 22
+
+/* Global commandline options */
+struct Opt_args {
+ enum StartUp {
+ ST_CLEAR = 1,
+ ST_SAVE = 2,
+ ST_DEACTIVATED = 3
+ } startup;
+ unsigned long hwinitpcrs;
+ int loglevel;
+ uint32_t tpmconf;
+ bool enable_maint_cmds;
+};
+extern struct Opt_args opt_args;
+
+#endif
diff --git a/stubdom/vtpm/vtpm_cmd.c b/stubdom/vtpm/vtpm_cmd.c
new file mode 100644
index 0000000..7eae98b
--- /dev/null
+++ b/stubdom/vtpm/vtpm_cmd.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2010-2012 United States Government, as represented by
+ * the Secretary of Defense. All rights reserved.
+ *
+ * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+ * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+ * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+ * SOFTWARE.
+ */
+
+#include <types.h>
+#include <xen/xen.h>
+#include <mm.h>
+#include <gnttab.h>
+#include "tpm/tpm_marshalling.h"
+#include "vtpm_manager.h"
+#include "vtpm_cmd.h"
+#include <tpmback.h>
+
+#define TRYFAILGOTO(C) \
+ if((C)) { \
+ status = TPM_FAIL; \
+ goto abort_egress; \
+ }
+#define TRYFAILGOTOMSG(C, msg) \
+ if((C)) { \
+ status = TPM_FAIL; \
+ error(msg); \
+ goto abort_egress; \
+ }
+#define CHECKSTATUSGOTO(ret, fname) \
+ if((ret) != TPM_SUCCESS) { \
+ error("%s failed with error code (%lu)", fname, (unsigned long) ret); \
+ status = ord; \
+ goto abort_egress; \
+ }
+
+#define ERR_MALFORMED "Malformed response from backend"
+#define ERR_TPMFRONT "Error sending command through frontend device"
+
+struct shpage {
+ void* page;
+ grant_ref_t grantref;
+};
+
+typedef struct shpage shpage_t;
+
+static inline int pack_header(uint8_t** bptr, UINT32* len, TPM_TAG tag, UINT32
size, TPM_COMMAND_CODE ord)
+{
+ return *bptr == NULL ||
+ tpm_marshal_UINT16(bptr, len, tag) ||
+ tpm_marshal_UINT32(bptr, len, size) ||
+ tpm_marshal_UINT32(bptr, len, ord);
+}
+
+static inline int unpack_header(uint8_t** bptr, UINT32* len, TPM_TAG* tag,
UINT32* size, TPM_COMMAND_CODE* ord)
+{
+ return *bptr == NULL ||
+ tpm_unmarshal_UINT16(bptr, len, tag) ||
+ tpm_unmarshal_UINT32(bptr, len, size) ||
+ tpm_unmarshal_UINT32(bptr, len, ord);
+}
+
+int create_error_response(tpmcmd_t* tpmcmd, TPM_RESULT errorcode)
+{
+ TPM_TAG tag;
+ UINT32 len = tpmcmd->req_len;
+ uint8_t* respptr;
+ uint8_t* cmdptr = tpmcmd->req;
+
+ if(!tpm_unmarshal_UINT16(&cmdptr, &len, &tag)) {
+ switch (tag) {
+ case TPM_TAG_RQU_COMMAND:
+ tag = TPM_TAG_RSP_COMMAND;
+ break;
+ case TPM_TAG_RQU_AUTH1_COMMAND:
+ tag = TPM_TAG_RQU_AUTH2_COMMAND;
+ break;
+ case TPM_TAG_RQU_AUTH2_COMMAND:
+ tag = TPM_TAG_RQU_AUTH2_COMMAND;
+ break;
+ }
+ } else {
+ tag = TPM_TAG_RSP_COMMAND;
+ }
+
+ tpmcmd->resp_len = len = 10;
+ tpmcmd->resp = respptr = tpm_malloc(tpmcmd->resp_len);
+
+ return pack_header(&respptr, &len, tag, len, errorcode);
+}
+
+TPM_RESULT VTPM_GetRandom(struct tpmfront_dev* tpmfront_dev, BYTE* bytes,
UINT32 *numbytes) {
+ TPM_RESULT status = TPM_SUCCESS;
+ uint8_t* cmdbuf, *resp, *bptr;
+ size_t resplen = 0;
+ UINT32 len;
+
+ /*Ask the real tpm for random bytes for the seed */
+ TPM_TAG tag = TPM_TAG_RQU_COMMAND;
+ UINT32 size;
+ TPM_COMMAND_CODE ord = TPM_ORD_GetRandom;
+ len = size = sizeof(TPM_TAG) + sizeof(UINT32) + sizeof(TPM_COMMAND_CODE) +
sizeof(UINT32);
+
+ /*Create the raw tpm command */
+ bptr = cmdbuf = malloc(size);
+ TRYFAILGOTO(pack_header(&bptr, &len, tag, size, ord));
+ TRYFAILGOTO(tpm_marshal_UINT32(&bptr, &len, *numbytes));
+
+ /* Send cmd, wait for response */
+ TRYFAILGOTOMSG(tpmfront_cmd(tpmfront_dev, cmdbuf, size, &resp, &resplen),
+ ERR_TPMFRONT);
+
+ bptr = resp; len = resplen;
+ TRYFAILGOTOMSG(unpack_header(&bptr, &len, &tag, &size, &ord),
ERR_MALFORMED);
+
+ //Check return status of command
+ CHECKSTATUSGOTO(ord, "TPM_GetRandom()");
+
+ // Get the number of random bytes in the response
+ TRYFAILGOTOMSG(tpm_unmarshal_UINT32(&bptr, &len, &size), ERR_MALFORMED);
+ *numbytes = size;
+
+ //Get the random bytes out, tpm may give us less bytes than what we wanrt
+ TRYFAILGOTOMSG(tpm_unmarshal_BYTE_ARRAY(&bptr, &len, bytes, *numbytes),
ERR_MALFORMED);
+
+ goto egress;
+abort_egress:
+egress:
+ free(cmdbuf);
+ return status;
+
+}
+
+TPM_RESULT VTPM_LoadHashKey(struct tpmfront_dev* tpmfront_dev, uint8_t** data,
size_t* data_length)
+{
+ TPM_RESULT status = TPM_SUCCESS;
+ uint8_t* bptr, *resp;
+ uint8_t* cmdbuf = NULL;
+ size_t resplen = 0;
+ UINT32 len;
+
+ TPM_TAG tag = VTPM_TAG_REQ;
+ UINT32 size;
+ TPM_COMMAND_CODE ord = VTPM_ORD_LOADHASHKEY;
+
+ /*Create the command*/
+ len = size = VTPM_COMMAND_HEADER_SIZE;
+ bptr = cmdbuf = malloc(size);
+ TRYFAILGOTO(pack_header(&bptr, &len, tag, size, ord));
+
+ /* Send the command to vtpm_manager */
+ info("Requesting Encryption key from backend");
+ TRYFAILGOTOMSG(tpmfront_cmd(tpmfront_dev, cmdbuf, size, &resp, &resplen),
ERR_TPMFRONT);
+
+ /* Unpack response header */
+ bptr = resp;
+ len = resplen;
+ TRYFAILGOTOMSG(unpack_header(&bptr, &len, &tag, &size, &ord),
ERR_MALFORMED);
+
+ /* Check return code */
+ CHECKSTATUSGOTO(ord, "VTPM_LoadHashKey()");
+
+ /* Get the size of the key */
+ *data_length = size - VTPM_COMMAND_HEADER_SIZE;
+
+ /* Copy the key bits */
+ *data = malloc(*data_length);
+ memcpy(*data, bptr, *data_length);
+
+ goto egress;
+abort_egress:
+ error("VTPM_LoadHashKey failed");
+egress:
+ free(cmdbuf);
+ return status;
+}
+
+TPM_RESULT VTPM_SaveHashKey(struct tpmfront_dev* tpmfront_dev, uint8_t* data,
size_t data_length)
+{
+ TPM_RESULT status = TPM_SUCCESS;
+ uint8_t* bptr, *resp;
+ uint8_t* cmdbuf = NULL;
+ size_t resplen = 0;
+ UINT32 len;
+
+ TPM_TAG tag = VTPM_TAG_REQ;
+ UINT32 size;
+ TPM_COMMAND_CODE ord = VTPM_ORD_SAVEHASHKEY;
+
+ /*Create the command*/
+ len = size = VTPM_COMMAND_HEADER_SIZE + data_length;
+ bptr = cmdbuf = malloc(size);
+ TRYFAILGOTO(pack_header(&bptr, &len, tag, size, ord));
+ memcpy(bptr, data, data_length);
+ bptr += data_length;
+
+ /* Send the command to vtpm_manager */
+ info("Sending encryption key to backend");
+ TRYFAILGOTOMSG(tpmfront_cmd(tpmfront_dev, cmdbuf, size, &resp, &resplen),
ERR_TPMFRONT);
+
+ /* Unpack response header */
+ bptr = resp;
+ len = resplen;
+ TRYFAILGOTOMSG(unpack_header(&bptr, &len, &tag, &size, &ord),
ERR_MALFORMED);
+
+ /* Check return code */
+ CHECKSTATUSGOTO(ord, "VTPM_SaveHashKey()");
+
+ goto egress;
+abort_egress:
+ error("VTPM_SaveHashKey failed");
+egress:
+ free(cmdbuf);
+ return status;
+}
+
+TPM_RESULT VTPM_PCRRead(struct tpmfront_dev* tpmfront_dev, UINT32 pcrIndex,
BYTE* outDigest)
+{
+ TPM_RESULT status = TPM_SUCCESS;
+ uint8_t *cmdbuf, *resp, *bptr;
+ size_t resplen = 0;
+ UINT32 len;
+
+ /*Just send a TPM_PCRRead Command to the HW tpm */
+ TPM_TAG tag = TPM_TAG_RQU_COMMAND;
+ UINT32 size;
+ TPM_COMMAND_CODE ord = TPM_ORD_PCRRead;
+ len = size = sizeof(TPM_TAG) + sizeof(UINT32) + sizeof(TPM_COMMAND_CODE) +
sizeof(UINT32);
+
+ /*Create the raw tpm cmd */
+ bptr = cmdbuf = malloc(size);
+ TRYFAILGOTO(pack_header(&bptr, &len, tag, size, ord));
+ TRYFAILGOTO(tpm_marshal_UINT32(&bptr, &len, pcrIndex));
+
+ /*Send Cmd wait for response */
+ TRYFAILGOTOMSG(tpmfront_cmd(tpmfront_dev, cmdbuf, size, &resp, &resplen),
ERR_TPMFRONT);
+
+ bptr = resp; len = resplen;
+ TRYFAILGOTOMSG(unpack_header(&bptr, &len, &tag, &size, &ord),
ERR_MALFORMED);
+
+ //Check return status of command
+ CHECKSTATUSGOTO(ord, "TPM_PCRRead");
+
+ //Get the ptr value
+ memcpy(outDigest, bptr, sizeof(TPM_PCRVALUE));
+
+ goto egress;
+abort_egress:
+egress:
+ free(cmdbuf);
+ return status;
+
+}
diff --git a/stubdom/vtpm/vtpm_cmd.h b/stubdom/vtpm/vtpm_cmd.h
new file mode 100644
index 0000000..b0bfa22
--- /dev/null
+++ b/stubdom/vtpm/vtpm_cmd.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2010-2012 United States Government, as represented by
+ * the Secretary of Defense. All rights reserved.
+ *
+ * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+ * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+ * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+ * SOFTWARE.
+ */
+
+#ifndef MANAGER_H
+#define MANAGER_H
+
+#include <tpmfront.h>
+#include <tpmback.h>
+#include "tpm/tpm_structures.h"
+
+/* Create a command response error header */
+int create_error_response(tpmcmd_t* tpmcmd, TPM_RESULT errorcode);
+/* Request random bytes from hardware tpm, returns 0 on success */
+TPM_RESULT VTPM_GetRandom(struct tpmfront_dev* tpmfront_dev, BYTE* bytes,
UINT32* numbytes);
+/* Retreive 256 bit AES encryption key from manager */
+TPM_RESULT VTPM_LoadHashKey(struct tpmfront_dev* tpmfront_dev, uint8_t** data,
size_t* data_length);
+/* Manager securely saves our 256 bit AES encryption key */
+TPM_RESULT VTPM_SaveHashKey(struct tpmfront_dev* tpmfront_dev, uint8_t* data,
size_t data_length);
+/* Send a TPM_PCRRead command passthrough the manager to the hw tpm */
+TPM_RESULT VTPM_PCRRead(struct tpmfront_dev* tpmfront_dev, UINT32 pcrIndex,
BYTE* outDigest);
+
+#endif
diff --git a/stubdom/vtpm/vtpm_pcrs.c b/stubdom/vtpm/vtpm_pcrs.c
new file mode 100644
index 0000000..22a6cef
--- /dev/null
+++ b/stubdom/vtpm/vtpm_pcrs.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2010-2012 United States Government, as represented by
+ * the Secretary of Defense. All rights reserved.
+ *
+ * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+ * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+ * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+ * SOFTWARE.
+ */
+
+#include "vtpm_pcrs.h"
+#include "vtpm_cmd.h"
+#include "tpm/tpm_data.h"
+
+#define PCR_VALUE tpmData.permanent.data.pcrValue
+
+static int write_pcr_direct(unsigned int pcrIndex, uint8_t* val) {
+ if(pcrIndex > TPM_NUM_PCR) {
+ return TPM_BADINDEX;
+ }
+ memcpy(&PCR_VALUE[pcrIndex], val, sizeof(TPM_PCRVALUE));
+ return TPM_SUCCESS;
+}
+
+TPM_RESULT vtpm_initialize_hw_pcrs(struct tpmfront_dev* tpmfront_dev, unsigned
long pcrs)
+{
+ TPM_RESULT rc = TPM_SUCCESS;
+ uint8_t digest[sizeof(TPM_PCRVALUE)];
+
+ for(unsigned int i = 0; i < TPM_NUM_PCR; ++i) {
+ if(pcrs & 1 << i) {
+ if((rc = VTPM_PCRRead(tpmfront_dev, i, digest)) != TPM_SUCCESS) {
+ error("TPM_PCRRead failed with error : %d", rc);
+ return rc;
+ }
+ write_pcr_direct(i, digest);
+ }
+ }
+
+ return rc;
+}
diff --git a/stubdom/vtpm/vtpm_pcrs.h b/stubdom/vtpm/vtpm_pcrs.h
new file mode 100644
index 0000000..11835f9
--- /dev/null
+++ b/stubdom/vtpm/vtpm_pcrs.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2010-2012 United States Government, as represented by
+ * the Secretary of Defense. All rights reserved.
+ *
+ * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+ * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+ * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+ * SOFTWARE.
+ */
+
+#ifndef VTPM_PCRS_H
+#define VTPM_PCRS_H
+
+#include "tpm/tpm_structures.h"
+
+#define VTPM_PCR0 1
+#define VTPM_PCR1 1 << 1
+#define VTPM_PCR2 1 << 2
+#define VTPM_PCR3 1 << 3
+#define VTPM_PCR4 1 << 4
+#define VTPM_PCR5 1 << 5
+#define VTPM_PCR6 1 << 6
+#define VTPM_PCR7 1 << 7
+#define VTPM_PCR8 1 << 8
+#define VTPM_PCR9 1 << 9
+#define VTPM_PCR10 1 << 10
+#define VTPM_PCR11 1 << 11
+#define VTPM_PCR12 1 << 12
+#define VTPM_PCR13 1 << 13
+#define VTPM_PCR14 1 << 14
+#define VTPM_PCR15 1 << 15
+#define VTPM_PCR16 1 << 16
+#define VTPM_PCR17 1 << 17
+#define VTPM_PCR18 1 << 18
+#define VTPM_PCR19 1 << 19
+#define VTPM_PCR20 1 << 20
+#define VTPM_PCR21 1 << 21
+#define VTPM_PCR22 1 << 22
+#define VTPM_PCR23 1 << 23
+
+#define VTPM_PCRALL (1 << TPM_NUM_PCR) - 1
+#define VTPM_PCRNONE 0
+
+#define VTPM_NUMPCRS 24
+
+struct tpmfront_dev;
+
+TPM_RESULT vtpm_initialize_hw_pcrs(struct tpmfront_dev* tpmfront_dev, unsigned
long pcrs);
+
+
+#endif
diff --git a/stubdom/vtpm/vtpmblk.c b/stubdom/vtpm/vtpmblk.c
new file mode 100644
index 0000000..b343bd8
--- /dev/null
+++ b/stubdom/vtpm/vtpmblk.c
@@ -0,0 +1,307 @@
+/*
+ * Copyright (c) 2010-2012 United States Government, as represented by
+ * the Secretary of Defense. All rights reserved.
+ *
+ * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+ * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+ * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+ * SOFTWARE.
+ */
+
+#include <mini-os/byteorder.h>
+#include "vtpmblk.h"
+#include "tpm/tpm_marshalling.h"
+#include "vtpm_cmd.h"
+#include "polarssl/aes.h"
+#include "polarssl/sha1.h"
+#include <blkfront.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+/*Encryption key and block sizes */
+#define BLKSZ 16
+
+static struct blkfront_dev* blkdev = NULL;
+static int blkfront_fd = -1;
+
+int init_vtpmblk(struct tpmfront_dev* tpmfront_dev)
+{
+ struct blkfront_info blkinfo;
+ info("Initializing persistent NVM storage\n");
+
+ if((blkdev = init_blkfront(NULL, &blkinfo)) == NULL) {
+ error("BLKIO: ERROR Unable to initialize blkfront");
+ return -1;
+ }
+ if (blkinfo.info & VDISK_READONLY || blkinfo.mode != O_RDWR) {
+ error("BLKIO: ERROR block device is read only!");
+ goto error;
+ }
+ if((blkfront_fd = blkfront_open(blkdev)) == -1) {
+ error("Unable to open blkfront file descriptor!");
+ goto error;
+ }
+
+ return 0;
+error:
+ shutdown_blkfront(blkdev);
+ blkdev = NULL;
+ return -1;
+}
+
+void shutdown_vtpmblk(void)
+{
+ close(blkfront_fd);
+ blkfront_fd = -1;
+ blkdev = NULL;
+}
+
+int write_vtpmblk_raw(uint8_t *data, size_t data_length)
+{
+ int rc;
+ uint32_t lenbuf;
+ debug("Begin Write data=%p len=%u", data, data_length);
+
+ lenbuf = cpu_to_be32((uint32_t)data_length);
+
+ lseek(blkfront_fd, 0, SEEK_SET);
+ if((rc = write(blkfront_fd, (uint8_t*)&lenbuf, 4)) != 4) {
+ error("write(length) failed! error was %s", strerror(errno));
+ return -1;
+ }
+ if((rc = write(blkfront_fd, data, data_length)) != data_length) {
+ error("write(data) failed! error was %s", strerror(errno));
+ return -1;
+ }
+
+ info("Wrote %u bytes to NVM persistent storage", data_length);
+
+ return 0;
+}
+
+int read_vtpmblk_raw(uint8_t **data, size_t *data_length)
+{
+ int rc;
+ uint32_t lenbuf;
+
+ lseek(blkfront_fd, 0, SEEK_SET);
+ if(( rc = read(blkfront_fd, (uint8_t*)&lenbuf, 4)) != 4) {
+ error("read(length) failed! error was %s", strerror(errno));
+ return -1;
+ }
+ *data_length = (size_t) cpu_to_be32(lenbuf);
+ if(*data_length == 0) {
+ error("read 0 data_length for NVM");
+ return -1;
+ }
+
+ *data = tpm_malloc(*data_length);
+ if((rc = read(blkfront_fd, *data, *data_length)) != *data_length) {
+ error("read(data) failed! error was %s", strerror(errno));
+ return -1;
+ }
+
+ info("Read %u bytes from NVM persistent storage", *data_length);
+ return 0;
+}
+
+int encrypt_vtpmblk(uint8_t* clear, size_t clear_len, uint8_t** cipher,
size_t* cipher_len, uint8_t* symkey)
+{
+ int rc = 0;
+ uint8_t iv[BLKSZ];
+ aes_context aes_ctx;
+ UINT32 temp;
+ int mod;
+
+ uint8_t* clbuf = NULL;
+
+ uint8_t* ivptr;
+ int ivlen;
+
+ uint8_t* cptr; //Cipher block pointer
+ int clen; //Cipher block length
+
+ /*Create a new 256 bit encryption key */
+ if(symkey == NULL) {
+ rc = -1;
+ goto abort_egress;
+ }
+ tpm_get_extern_random_bytes(symkey, NVMKEYSZ);
+
+ /*Setup initialization vector - random bits and then 4 bytes clear text
size at the end*/
+ temp = sizeof(UINT32);
+ ivlen = BLKSZ - temp;
+ tpm_get_extern_random_bytes(iv, ivlen);
+ ivptr = iv + ivlen;
+ tpm_marshal_UINT32(&ivptr, &temp, (UINT32) clear_len);
+
+ /*The clear text needs to be padded out to a multiple of BLKSZ */
+ mod = clear_len % BLKSZ;
+ clen = mod ? clear_len + BLKSZ - mod : clear_len;
+ clbuf = malloc(clen);
+ if (clbuf == NULL) {
+ rc = -1;
+ goto abort_egress;
+ }
+ memcpy(clbuf, clear, clear_len);
+ /* zero out the padding bits - FIXME: better / more secure way to handle
these? */
+ if(clen - clear_len) {
+ memset(clbuf + clear_len, 0, clen - clear_len);
+ }
+
+ /* Setup the ciphertext buffer */
+ *cipher_len = BLKSZ + clen; /*iv + ciphertext */
+ cptr = *cipher = malloc(*cipher_len);
+ if (*cipher == NULL) {
+ rc = -1;
+ goto abort_egress;
+ }
+
+ /* Copy the IV to cipher text blob*/
+ memcpy(cptr, iv, BLKSZ);
+ cptr += BLKSZ;
+
+ /* Setup encryption */
+ aes_setkey_enc(&aes_ctx, symkey, 256);
+
+ /* Do encryption now */
+ aes_crypt_cbc(&aes_ctx, AES_ENCRYPT, clen, iv, clbuf, cptr);
+
+ goto egress;
+abort_egress:
+egress:
+ free(clbuf);
+ return rc;
+}
+int decrypt_vtpmblk(uint8_t* cipher, size_t cipher_len, uint8_t** clear,
size_t* clear_len, uint8_t* symkey)
+{
+ int rc = 0;
+ uint8_t iv[BLKSZ];
+ uint8_t* ivptr;
+ UINT32 u32, temp;
+ aes_context aes_ctx;
+
+ uint8_t* cptr = cipher; //cipher block pointer
+ int clen = cipher_len; //cipher block length
+
+ /* Pull out the initialization vector */
+ memcpy(iv, cipher, BLKSZ);
+ cptr += BLKSZ;
+ clen -= BLKSZ;
+
+ /* Setup the clear text buffer */
+ if((*clear = malloc(clen)) == NULL) {
+ rc = -1;
+ goto abort_egress;
+ }
+
+ /* Get the length of clear text from last 4 bytes of iv */
+ temp = sizeof(UINT32);
+ ivptr = iv + BLKSZ - temp;
+ tpm_unmarshal_UINT32(&ivptr, &temp, &u32);
+ *clear_len = u32;
+
+ /* Setup decryption */
+ aes_setkey_dec(&aes_ctx, symkey, 256);
+
+ /* Do decryption now */
+ if ((clen % BLKSZ) != 0) {
+ error("Decryption Error: Cipher block size was not a multiple of %u",
BLKSZ);
+ rc = -1;
+ goto abort_egress;
+ }
+ aes_crypt_cbc(&aes_ctx, AES_DECRYPT, clen, iv, cptr, *clear);
+
+ goto egress;
+abort_egress:
+egress:
+ return rc;
+}
+
+int write_vtpmblk(struct tpmfront_dev* tpmfront_dev, uint8_t* data, size_t
data_length) {
+ int rc;
+ uint8_t* cipher = NULL;
+ size_t cipher_len = 0;
+ uint8_t hashkey[HASHKEYSZ];
+ uint8_t* symkey = hashkey + HASHSZ;
+
+ /* Encrypt the data */
+ if((rc = encrypt_vtpmblk(data, data_length, &cipher, &cipher_len, symkey)))
{
+ goto abort_egress;
+ }
+ /* Write to disk */
+ if((rc = write_vtpmblk_raw(cipher, cipher_len))) {
+ goto abort_egress;
+ }
+ /* Get sha1 hash of data */
+ sha1(cipher, cipher_len, hashkey);
+
+ /* Send hash and key to manager */
+ if((rc = VTPM_SaveHashKey(tpmfront_dev, hashkey, HASHKEYSZ)) !=
TPM_SUCCESS) {
+ goto abort_egress;
+ }
+ goto egress;
+abort_egress:
+egress:
+ free(cipher);
+ return rc;
+}
+
+int read_vtpmblk(struct tpmfront_dev* tpmfront_dev, uint8_t** data, size_t
*data_length) {
+ int rc;
+ uint8_t* cipher = NULL;
+ size_t cipher_len = 0;
+ size_t keysize;
+ uint8_t* hashkey = NULL;
+ uint8_t hash[HASHSZ];
+ uint8_t* symkey;
+
+ /* Retreive the hash and the key from the manager */
+ if((rc = VTPM_LoadHashKey(tpmfront_dev, &hashkey, &keysize)) !=
TPM_SUCCESS) {
+ goto abort_egress;
+ }
+ if(keysize != HASHKEYSZ) {
+ error("Manager returned a hashkey of invalid size! expected %d, actual
%d", NVMKEYSZ, keysize);
+ rc = -1;
+ goto abort_egress;
+ }
+ symkey = hashkey + HASHSZ;
+
+ /* Read from disk now */
+ if((rc = read_vtpmblk_raw(&cipher, &cipher_len))) {
+ goto abort_egress;
+ }
+
+ /* Compute the hash of the cipher text and compare */
+ sha1(cipher, cipher_len, hash);
+ if(memcmp(hash, hashkey, HASHSZ)) {
+ int i;
+ error("NVM Storage Checksum failed!");
+ printf("Expected: ");
+ for(i = 0; i < HASHSZ; ++i) {
+ printf("%02hhX ", hashkey[i]);
+ }
+ printf("\n");
+ printf("Actual: ");
+ for(i = 0; i < HASHSZ; ++i) {
+ printf("%02hhX ", hash[i]);
+ }
+ printf("\n");
+ rc = -1;
+ goto abort_egress;
+ }
+
+ /* Decrypt the blob */
+ if((rc = decrypt_vtpmblk(cipher, cipher_len, data, data_length, symkey))) {
+ goto abort_egress;
+ }
+ goto egress;
+abort_egress:
+egress:
+ free(cipher);
+ free(hashkey);
+ return rc;
+}
diff --git a/stubdom/vtpm/vtpmblk.h b/stubdom/vtpm/vtpmblk.h
new file mode 100644
index 0000000..282ce6a
--- /dev/null
+++ b/stubdom/vtpm/vtpmblk.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2010-2012 United States Government, as represented by
+ * the Secretary of Defense. All rights reserved.
+ *
+ * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
+ * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
+ * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
+ * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
+ * SOFTWARE.
+ */
+
+#ifndef NVM_H
+#define NVM_H
+#include <mini-os/types.h>
+#include <xen/xen.h>
+#include <tpmfront.h>
+
+#define NVMKEYSZ 32
+#define HASHSZ 20
+#define HASHKEYSZ (NVMKEYSZ + HASHSZ)
+
+int init_vtpmblk(struct tpmfront_dev* tpmfront_dev);
+void shutdown_vtpmblk(void);
+
+/* Encrypts and writes data to blk device */
+int write_vtpmblk(struct tpmfront_dev* tpmfront_dev, uint8_t *data, size_t
data_length);
+/* Reads, Decrypts, and returns data from blk device */
+int read_vtpmblk(struct tpmfront_dev* tpmfront_dev, uint8_t **data, size_t
*data_length);
+
+#endif
--
1.7.10.4
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