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qemu / seabios / refs/heads/1.10-stable / . / src / tcgbios.c
blob: d62ab9934c1bfa1e35bfac05a334f55cde9737cf [file] [log] [blame]
// Implementation of the TCG BIOS extension according to the specification
// described in specs found at
// http://www.trustedcomputinggroup.org/resources/pc_client_work_group_specific_implementation_specification_for_conventional_bios
//
// Copyright (C) 2006-2011, 2014, 2015 IBM Corporation
//
// Authors:
// Stefan Berger <stefanb@linux.vnet.ibm.com>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "bregs.h" // struct bregs
#include "byteorder.h" // cpu_to_*
#include "config.h" // CONFIG_TCGBIOS
#include "farptr.h" // MAKE_FLATPTR
#include "fw/paravirt.h" // runningOnXen
#include "hw/tpm_drivers.h" // tpm_drivers[]
#include "output.h" // dprintf
#include "sha1.h" // sha1
#include "std/acpi.h" // RSDP_SIGNATURE, rsdt_descriptor
#include "std/smbios.h" // struct smbios_entry_point
#include "std/tcg.h" // TCG_PC_LOGOVERFLOW
#include "string.h" // checksum
#include "tcgbios.h"// tpm_*, prototypes
#include "util.h" // printf, get_keystroke
#include "stacks.h" // wait_threads, reset
#include "malloc.h" // malloc_high
/****************************************************************
* TPM 1.2 commands
****************************************************************/
static const u8 Startup_ST_CLEAR[] = { 0x00, TPM_ST_CLEAR };
static const u8 Startup_ST_STATE[] = { 0x00, TPM_ST_STATE };
static const u8 PhysicalPresence_CMD_ENABLE[] = { 0x00, 0x20 };
static const u8 PhysicalPresence_PRESENT[] = { 0x00, 0x08 };
static const u8 PhysicalPresence_NOT_PRESENT_LOCK[] = { 0x00, 0x14 };
static const u8 CommandFlag_FALSE[1] = { 0x00 };
static const u8 CommandFlag_TRUE[1] = { 0x01 };
/****************************************************************
* TPM 2 commands
****************************************************************/
static const u8 Startup_SU_CLEAR[] = { 0x00, TPM2_SU_CLEAR};
static const u8 Startup_SU_STATE[] = { 0x00, TPM2_SU_STATE};
static const u8 TPM2_SelfTest_YES[] = { TPM2_YES }; /* full test */
typedef u8 tpm_ppi_code;
/****************************************************************
* ACPI TCPA table interface
****************************************************************/
struct {
/* length of the TCPA log buffer */
u32 log_area_minimum_length;
/* start address of TCPA log buffer */
u8 * log_area_start_address;
/* number of log entries written */
u32 entry_count;
/* address to write next log entry to */
u8 * log_area_next_entry;
/* address of last entry written (need for TCG_StatusCheck) */
u8 * log_area_last_entry;
} tpm_state VARLOW;
static int TPM_has_physical_presence;
static TPMVersion TPM_version;
static u32 tpm20_pcr_selection_size;
static struct tpml_pcr_selection *tpm20_pcr_selection;
static struct tcpa_descriptor_rev2 *
find_tcpa_by_rsdp(struct rsdp_descriptor *rsdp)
{
if (!rsdp) {
dprintf(DEBUG_tcg,
"TCGBIOS: RSDP was NOT found! -- Disabling interface.\n");
return NULL;
}
struct rsdt_descriptor *rsdt = (void*)rsdp->rsdt_physical_address;
if (!rsdt)
return NULL;
u32 length = rsdt->length;
u16 off = offsetof(struct rsdt_descriptor, entry);
u32 ctr = 0;
while ((off + sizeof(rsdt->entry[0])) <= length) {
/* try all pointers to structures */
struct tcpa_descriptor_rev2 *tcpa = (void*)rsdt->entry[ctr];
/* valid TCPA ACPI table ? */
if (tcpa->signature == TCPA_SIGNATURE
&& checksum(tcpa, tcpa->length) == 0)
return tcpa;
off += sizeof(rsdt->entry[0]);
ctr++;
}
dprintf(DEBUG_tcg, "TCGBIOS: TCPA ACPI was NOT found!\n");
return NULL;
}
static int
tpm_tcpa_probe(void)
{
struct tcpa_descriptor_rev2 *tcpa = find_tcpa_by_rsdp(RsdpAddr);
if (!tcpa)
return -1;
u8 *log_area_start_address = (u8*)(long)tcpa->log_area_start_address;
u32 log_area_minimum_length = tcpa->log_area_minimum_length;
if (!log_area_start_address || !log_area_minimum_length)
return -1;
memset(log_area_start_address, 0, log_area_minimum_length);
tpm_state.log_area_start_address = log_area_start_address;
tpm_state.log_area_minimum_length = log_area_minimum_length;
tpm_state.log_area_next_entry = log_area_start_address;
tpm_state.log_area_last_entry = NULL;
tpm_state.entry_count = 0;
return 0;
}
/*
* Extend the ACPI log with the given entry by copying the
* entry data into the log.
* Input
* entry : The header data to use (including the variable length digest)
* digest_len : Length of the digest in 'entry'
* event : Pointer to the event body to be copied into the log
* event_len : Length of 'event'
*
* Output:
* Returns an error code in case of faiure, 0 in case of success
*/
static int
tpm_log_event(struct tpm_log_header *entry, int digest_len
, const void *event, int event_len)
{
dprintf(DEBUG_tcg, "TCGBIOS: LASA = %p, next entry = %p\n",
tpm_state.log_area_start_address, tpm_state.log_area_next_entry);
if (tpm_state.log_area_next_entry == NULL)
return -1;
u32 size = (sizeof(*entry) + digest_len
+ sizeof(struct tpm_log_trailer) + event_len);
u32 logsize = (tpm_state.log_area_next_entry + size
- tpm_state.log_area_start_address);
if (logsize > tpm_state.log_area_minimum_length) {
dprintf(DEBUG_tcg, "TCGBIOS: LOG OVERFLOW: size = %d\n", size);
return -1;
}
void *dest = tpm_state.log_area_next_entry;
memcpy(dest, entry, sizeof(*entry) + digest_len);
struct tpm_log_trailer *t = dest + sizeof(*entry) + digest_len;
t->eventdatasize = event_len;
memcpy(t->event, event, event_len);
tpm_state.log_area_last_entry = tpm_state.log_area_next_entry;
tpm_state.log_area_next_entry += size;
tpm_state.entry_count++;
return 0;
}
/****************************************************************
* Helper functions
****************************************************************/
u8 TPM_working VARLOW;
static int
tpm_is_working(void)
{
return CONFIG_TCGBIOS && TPM_working;
}
int
tpm_can_show_menu(void)
{
switch (TPM_version) {
case TPM_VERSION_1_2:
return tpm_is_working() && TPM_has_physical_presence;
case TPM_VERSION_2:
return tpm_is_working();
}
return 0;
}
// A 'struct tpm_log_entry' is a local data structure containing a
// 'tpm_log_header' followed by space for the maximum supported
// digest. (The digest is a sha1 hash on tpm1.2 or a series of
// tpm2_digest_value structs on tpm2.0)
struct tpm_log_entry {
struct tpm_log_header hdr;
u8 pad[sizeof(struct tpm2_digest_values)
+ 5 * sizeof(struct tpm2_digest_value)
+ SHA1_BUFSIZE + SHA256_BUFSIZE + SHA384_BUFSIZE
+ SHA512_BUFSIZE + SM3_256_BUFSIZE];
} PACKED;
static int
tpm20_get_hash_buffersize(u16 hashAlg)
{
switch (hashAlg) {
case TPM2_ALG_SHA1:
return SHA1_BUFSIZE;
case TPM2_ALG_SHA256:
return SHA256_BUFSIZE;
case TPM2_ALG_SHA384:
return SHA384_BUFSIZE;
case TPM2_ALG_SHA512:
return SHA512_BUFSIZE;
case TPM2_ALG_SM3_256:
return SM3_256_BUFSIZE;
default:
return -1;
}
}
// Add an entry at the start of the log describing digest formats
static int
tpm20_write_EfiSpecIdEventStruct(void)
{
if (!tpm20_pcr_selection)
return -1;
struct {
struct TCG_EfiSpecIdEventStruct hdr;
u8 pad[256];
} event = {
.hdr.signature = "Spec ID Event03",
.hdr.platformClass = TPM_TCPA_ACPI_CLASS_CLIENT,
.hdr.specVersionMinor = 0,
.hdr.specVersionMajor = 2,
.hdr.specErrata = 0,
.hdr.uintnSize = 2,
};
struct tpms_pcr_selection *sel = tpm20_pcr_selection->selections;
void *nsel, *end = (void*)tpm20_pcr_selection + tpm20_pcr_selection_size;
u32 count;
for (count = 0; count < be32_to_cpu(tpm20_pcr_selection->count); count++) {
u8 sizeOfSelect = sel->sizeOfSelect;
nsel = (void*)sel + sizeof(*sel) + sizeOfSelect;
if (nsel > end)
break;
int hsize = tpm20_get_hash_buffersize(be16_to_cpu(sel->hashAlg));
if (hsize < 0) {
dprintf(DEBUG_tcg, "TPM is using an unsupported hash: %d\n",
be16_to_cpu(sel->hashAlg));
return -1;
}
int event_size = offsetof(struct TCG_EfiSpecIdEventStruct
, digestSizes[count+1]);
if (event_size > sizeof(event) - sizeof(u32)) {
dprintf(DEBUG_tcg, "EfiSpecIdEventStruct pad too small\n");
return -1;
}
event.hdr.digestSizes[count].algorithmId = be16_to_cpu(sel->hashAlg);
event.hdr.digestSizes[count].digestSize = hsize;
sel = nsel;
}
if (sel != end) {
dprintf(DEBUG_tcg, "Malformed pcr selection structure fron TPM\n");
return -1;
}
event.hdr.numberOfAlgorithms = count;
int event_size = offsetof(struct TCG_EfiSpecIdEventStruct
, digestSizes[count]);
u32 *vendorInfoSize = (void*)&event + event_size;
*vendorInfoSize = 0;
event_size += sizeof(*vendorInfoSize);
struct tpm_log_entry le = {
.hdr.eventtype = EV_NO_ACTION,
};
return tpm_log_event(&le.hdr, SHA1_BUFSIZE, &event, event_size);
}
/*
* Build the TPM2 tpm2_digest_values data structure from the given hash.
* Follow the PCR bank configuration of the TPM and write the same hash
* in either truncated or zero-padded form in the areas of all the other
* hashes. For example, write the sha1 hash in the area of the sha256
* hash and fill the remaining bytes with zeros. Or truncate the sha256
* hash when writing it in the area of the sha1 hash.
*
* le: the log entry to build the digest in
* sha1: the sha1 hash value to use
*
* Returns the digest size; -1 on fatal error
*/
static int
tpm20_build_digest(struct tpm_log_entry *le, const u8 *sha1)
{
if (!tpm20_pcr_selection)
return -1;
struct tpms_pcr_selection *sel = tpm20_pcr_selection->selections;
void *nsel, *end = (void*)tpm20_pcr_selection + tpm20_pcr_selection_size;
void *dest = le->hdr.digest + sizeof(struct tpm2_digest_values);
u32 count;
for (count = 0; count < be32_to_cpu(tpm20_pcr_selection->count); count++) {
u8 sizeOfSelect = sel->sizeOfSelect;
nsel = (void*)sel + sizeof(*sel) + sizeOfSelect;
if (nsel > end)
break;
int hsize = tpm20_get_hash_buffersize(be16_to_cpu(sel->hashAlg));
if (hsize < 0) {
dprintf(DEBUG_tcg, "TPM is using an unsupported hash: %d\n",
be16_to_cpu(sel->hashAlg));
return -1;
}
/* buffer size sanity check before writing */
struct tpm2_digest_value *v = dest;
if (dest + sizeof(*v) + hsize > (void*)le + sizeof(*le)) {
dprintf(DEBUG_tcg, "tpm_log_entry is too small\n");
return -1;
}
v->hashAlg = sel->hashAlg;
memset(v->hash, 0, hsize);
memcpy(v->hash, sha1, hsize > SHA1_BUFSIZE ? SHA1_BUFSIZE : hsize);
dest += sizeof(*v) + hsize;
sel = nsel;
}
if (sel != end) {
dprintf(DEBUG_tcg, "Malformed pcr selection structure fron TPM\n");
return -1;
}
struct tpm2_digest_values *v = (void*)le->hdr.digest;
v->count = cpu_to_be32(count);
return dest - (void*)le->hdr.digest;
}
static int
tpm12_build_digest(struct tpm_log_entry *le, const u8 *sha1)
{
// On TPM 1.2 the digest contains just the SHA1 hash
memcpy(le->hdr.digest, sha1, SHA1_BUFSIZE);
return SHA1_BUFSIZE;
}
static int
tpm_build_digest(struct tpm_log_entry *le, const u8 *sha1)
{
switch (TPM_version) {
case TPM_VERSION_1_2:
return tpm12_build_digest(le, sha1);
case TPM_VERSION_2:
return tpm20_build_digest(le, sha1);
}
return -1;
}
/*
* Send a TPM command with the given ordinal. Append the given buffer
* containing all data in network byte order to the command (this is
* the custom part per command) and expect a response of the given size.
*/
static int
tpm_build_and_send_cmd(u8 locty, u32 ordinal, const u8 *append,
u32 append_size, enum tpmDurationType to_t)
{
struct {
struct tpm_req_header trqh;
u8 cmd[10];
} PACKED req = {
.trqh.tag = cpu_to_be16(TPM_TAG_RQU_CMD),
.trqh.totlen = cpu_to_be32(sizeof(req.trqh) + append_size),
.trqh.ordinal = cpu_to_be32(ordinal),
};
switch (TPM_version) {
case TPM_VERSION_1_2:
req.trqh.tag = cpu_to_be16(TPM_TAG_RQU_CMD);
break;
case TPM_VERSION_2:
req.trqh.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
break;
}
u8 obuffer[64];
struct tpm_rsp_header *trsh = (struct tpm_rsp_header *)obuffer;
u32 obuffer_len = sizeof(obuffer);
memset(obuffer, 0x0, sizeof(obuffer));
if (append_size > sizeof(req.cmd)) {
warn_internalerror();
return -1;
}
if (append_size)
memcpy(req.cmd, append, append_size);
int ret = tpmhw_transmit(locty, &req.trqh, obuffer, &obuffer_len, to_t);
ret = ret ? -1 : be32_to_cpu(trsh->errcode);
dprintf(DEBUG_tcg, "Return from build_and_send_cmd(%x, %x %x) = %x\n",
ordinal, req.cmd[0], req.cmd[1], ret);
return ret;
}
static int
tpm20_hierarchycontrol(u32 hierarchy, u8 state)
{
/* we will try to deactivate the TPM now - ignoring all errors */
struct tpm2_req_hierarchycontrol trh = {
.hdr.tag = cpu_to_be16(TPM2_ST_SESSIONS),
.hdr.totlen = cpu_to_be32(sizeof(trh)),
.hdr.ordinal = cpu_to_be32(TPM2_CC_HierarchyControl),
.authhandle = cpu_to_be32(TPM2_RH_PLATFORM),
.authblocksize = cpu_to_be32(sizeof(trh.authblock)),
.authblock = {
.handle = cpu_to_be32(TPM2_RS_PW),
.noncesize = cpu_to_be16(0),
.contsession = TPM2_YES,
.pwdsize = cpu_to_be16(0),
},
.enable = cpu_to_be32(hierarchy),
.state = state,
};
struct tpm_rsp_header rsp;
u32 resp_length = sizeof(rsp);
int ret = tpmhw_transmit(0, &trh.hdr, &rsp, &resp_length,
TPM_DURATION_TYPE_MEDIUM);
if (ret || resp_length != sizeof(rsp) || rsp.errcode)
ret = -1;
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_HierarchyControl = 0x%08x\n",
ret);
return ret;
}
static void
tpm_set_failure(void)
{
switch (TPM_version) {
case TPM_VERSION_1_2:
/*
* We will try to deactivate the TPM now - ignoring all errors
* Physical presence is asserted.
*/
tpm_build_and_send_cmd(0, TPM_ORD_SetTempDeactivated,
NULL, 0, TPM_DURATION_TYPE_SHORT);
break;
case TPM_VERSION_2:
tpm20_hierarchycontrol(TPM2_RH_ENDORSEMENT, TPM2_NO);
tpm20_hierarchycontrol(TPM2_RH_OWNER, TPM2_NO);
break;
}
TPM_working = 0;
}
static int
tpm12_get_capability(u32 cap, u32 subcap, struct tpm_rsp_header *rsp, u32 rsize)
{
struct tpm_req_getcap trgc = {
.hdr.tag = cpu_to_be16(TPM_TAG_RQU_CMD),
.hdr.totlen = cpu_to_be32(sizeof(trgc)),
.hdr.ordinal = cpu_to_be32(TPM_ORD_GetCapability),
.capArea = cpu_to_be32(cap),
.subCapSize = cpu_to_be32(sizeof(trgc.subCap)),
.subCap = cpu_to_be32(subcap)
};
u32 resp_size = rsize;
int ret = tpmhw_transmit(0, &trgc.hdr, rsp, &resp_size,
TPM_DURATION_TYPE_SHORT);
ret = (ret || resp_size != rsize) ? -1 : be32_to_cpu(rsp->errcode);
dprintf(DEBUG_tcg, "TCGBIOS: Return code from TPM_GetCapability(%d, %d)"
" = %x\n", cap, subcap, ret);
if (ret) {
dprintf(DEBUG_tcg, "TCGBIOS: TPM malfunctioning (line %d).\n", __LINE__);
tpm_set_failure();
}
return ret;
}
static int
tpm20_getcapability(u32 capability, u32 property, u32 count,
struct tpm_rsp_header *rsp, u32 rsize)
{
struct tpm2_req_getcapability trg = {
.hdr.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
.hdr.totlen = cpu_to_be32(sizeof(trg)),
.hdr.ordinal = cpu_to_be32(TPM2_CC_GetCapability),
.capability = cpu_to_be32(capability),
.property = cpu_to_be32(property),
.propertycount = cpu_to_be32(count),
};
u32 resp_size = rsize;
int ret = tpmhw_transmit(0, &trg.hdr, rsp, &resp_size,
TPM_DURATION_TYPE_SHORT);
ret = (ret ||
rsize < be32_to_cpu(rsp->totlen)) ? -1 : be32_to_cpu(rsp->errcode);
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_GetCapability = 0x%08x\n",
ret);
return ret;
}
static int
tpm20_get_pcrbanks(void)
{
u8 buffer[128];
struct tpm2_res_getcapability *trg =
(struct tpm2_res_getcapability *)&buffer;
int ret = tpm20_getcapability(TPM2_CAP_PCRS, 0, 8, &trg->hdr,
sizeof(buffer));
if (ret)
return ret;
u32 size = be32_to_cpu(trg->hdr.totlen) -
offsetof(struct tpm2_res_getcapability, data);
tpm20_pcr_selection = malloc_high(size);
if (tpm20_pcr_selection) {
memcpy(tpm20_pcr_selection, &trg->data, size);
tpm20_pcr_selection_size = size;
} else {
warn_noalloc();
ret = -1;
}
return ret;
}
static int
tpm12_determine_timeouts(void)
{
struct tpm_res_getcap_timeouts timeouts;
int ret = tpm12_get_capability(TPM_CAP_PROPERTY, TPM_CAP_PROP_TIS_TIMEOUT
, &timeouts.hdr, sizeof(timeouts));
if (ret)
return ret;
struct tpm_res_getcap_durations durations;
ret = tpm12_get_capability(TPM_CAP_PROPERTY, TPM_CAP_PROP_DURATION
, &durations.hdr, sizeof(durations));
if (ret)
return ret;
int i;
for (i = 0; i < 3; i++)
durations.durations[i] = be32_to_cpu(durations.durations[i]);
for (i = 0; i < 4; i++)
timeouts.timeouts[i] = be32_to_cpu(timeouts.timeouts[i]);
dprintf(DEBUG_tcg, "TCGBIOS: timeouts: %u %u %u %u\n",
timeouts.timeouts[0],
timeouts.timeouts[1],
timeouts.timeouts[2],
timeouts.timeouts[3]);
dprintf(DEBUG_tcg, "TCGBIOS: durations: %u %u %u\n",
durations.durations[0],
durations.durations[1],
durations.durations[2]);
tpmhw_set_timeouts(timeouts.timeouts, durations.durations);
return 0;
}
static void
tpm20_set_timeouts(void)
{
u32 durations[3] = {
TPM2_DEFAULT_DURATION_SHORT,
TPM2_DEFAULT_DURATION_MEDIUM,
TPM2_DEFAULT_DURATION_LONG,
};
u32 timeouts[4] = {
TIS2_DEFAULT_TIMEOUT_A,
TIS2_DEFAULT_TIMEOUT_B,
TIS2_DEFAULT_TIMEOUT_C,
TIS2_DEFAULT_TIMEOUT_D,
};
tpmhw_set_timeouts(timeouts, durations);
}
static int
tpm12_extend(struct tpm_log_entry *le, int digest_len)
{
struct tpm_req_extend tre = {
.hdr.tag = cpu_to_be16(TPM_TAG_RQU_CMD),
.hdr.totlen = cpu_to_be32(sizeof(tre)),
.hdr.ordinal = cpu_to_be32(TPM_ORD_Extend),
.pcrindex = cpu_to_be32(le->hdr.pcrindex),
};
memcpy(tre.digest, le->hdr.digest, sizeof(tre.digest));
struct tpm_rsp_extend rsp;
u32 resp_length = sizeof(rsp);
int ret = tpmhw_transmit(0, &tre.hdr, &rsp, &resp_length,
TPM_DURATION_TYPE_SHORT);
if (ret || resp_length != sizeof(rsp) || rsp.hdr.errcode)
return -1;
return 0;
}
static int tpm20_extend(struct tpm_log_entry *le, int digest_len)
{
struct tpm2_req_extend tmp_tre = {
.hdr.tag = cpu_to_be16(TPM2_ST_SESSIONS),
.hdr.totlen = cpu_to_be32(0),
.hdr.ordinal = cpu_to_be32(TPM2_CC_PCR_Extend),
.pcrindex = cpu_to_be32(le->hdr.pcrindex),
.authblocksize = cpu_to_be32(sizeof(tmp_tre.authblock)),
.authblock = {
.handle = cpu_to_be32(TPM2_RS_PW),
.noncesize = cpu_to_be16(0),
.contsession = TPM2_YES,
.pwdsize = cpu_to_be16(0),
},
};
u8 buffer[sizeof(tmp_tre) + sizeof(le->pad)];
struct tpm2_req_extend *tre = (struct tpm2_req_extend *)buffer;
memcpy(tre, &tmp_tre, sizeof(tmp_tre));
memcpy(&tre->digest[0], le->hdr.digest, digest_len);
tre->hdr.totlen = cpu_to_be32(sizeof(tmp_tre) + digest_len);
struct tpm_rsp_header rsp;
u32 resp_length = sizeof(rsp);
int ret = tpmhw_transmit(0, &tre->hdr, &rsp, &resp_length,
TPM_DURATION_TYPE_SHORT);
if (ret || resp_length != sizeof(rsp) || rsp.errcode)
return -1;
return 0;
}
static int
tpm_extend(struct tpm_log_entry *le, int digest_len)
{
switch (TPM_version) {
case TPM_VERSION_1_2:
return tpm12_extend(le, digest_len);
case TPM_VERSION_2:
return tpm20_extend(le, digest_len);
}
return -1;
}
/*
* Add a measurement to the log; the data at data_seg:data/length are
* appended to the TCG_PCClientPCREventStruct
*
* Input parameters:
* pcrindex : which PCR to extend
* event_type : type of event; specs section on 'Event Types'
* event : pointer to info (e.g., string) to be added to log as-is
* event_length: length of the event
* hashdata : pointer to the data to be hashed
* hashdata_length: length of the data to be hashed
*/
static void
tpm_add_measurement_to_log(u32 pcrindex, u32 event_type,
const char *event, u32 event_length,
const u8 *hashdata, u32 hashdata_length)
{
if (!tpm_is_working())
return;
u8 hash[SHA1_BUFSIZE];
sha1(hashdata, hashdata_length, hash);
struct tpm_log_entry le = {
.hdr.pcrindex = pcrindex,
.hdr.eventtype = event_type,
};
int digest_len = tpm_build_digest(&le, hash);
if (digest_len < 0)
return;
int ret = tpm_extend(&le, digest_len);
if (ret) {
tpm_set_failure();
return;
}
tpm_log_event(&le.hdr, digest_len, event, event_length);
}
/****************************************************************
* Setup and Measurements
****************************************************************/
// Add an EV_ACTION measurement to the list of measurements
static void
tpm_add_action(u32 pcrIndex, const char *string)
{
u32 len = strlen(string);
tpm_add_measurement_to_log(pcrIndex, EV_ACTION,
string, len, (u8 *)string, len);
}
/*
* Add event separators for PCRs 0 to 7; specs on 'Measuring Boot Events'
*/
static void
tpm_add_event_separators(void)
{
static const u8 evt_separator[] = {0xff,0xff,0xff,0xff};
u32 pcrIndex;
for (pcrIndex = 0; pcrIndex <= 7; pcrIndex++)
tpm_add_measurement_to_log(pcrIndex, EV_SEPARATOR,
NULL, 0,
evt_separator,
sizeof(evt_separator));
}
static void
tpm_smbios_measure(void)
{
struct pcctes pcctes = {
.eventid = 1,
.eventdatasize = SHA1_BUFSIZE,
};
struct smbios_entry_point *sep = SMBiosAddr;
dprintf(DEBUG_tcg, "TCGBIOS: SMBIOS at %p\n", sep);
if (!sep)
return;
sha1((const u8 *)sep->structure_table_address,
sep->structure_table_length, pcctes.digest);
tpm_add_measurement_to_log(1,
EV_EVENT_TAG,
(const char *)&pcctes, sizeof(pcctes),
(u8 *)&pcctes, sizeof(pcctes));
}
static int
tpm12_read_permanent_flags(char *buf, int buf_len)
{
memset(buf, 0, buf_len);
struct tpm_res_getcap_perm_flags pf;
int ret = tpm12_get_capability(TPM_CAP_FLAG, TPM_CAP_FLAG_PERMANENT
, &pf.hdr, sizeof(pf));
if (ret)
return -1;
memcpy(buf, &pf.perm_flags, buf_len);
return 0;
}
static int
tpm12_assert_physical_presence(void)
{
int ret = tpm_build_and_send_cmd(0, TPM_ORD_PhysicalPresence,
PhysicalPresence_PRESENT,
sizeof(PhysicalPresence_PRESENT),
TPM_DURATION_TYPE_SHORT);
if (!ret)
return 0;
struct tpm_permanent_flags pf;
ret = tpm12_read_permanent_flags((char *)&pf, sizeof(pf));
if (ret)
return -1;
/* check if hardware physical presence is supported */
if (pf.flags[PERM_FLAG_IDX_PHYSICAL_PRESENCE_HW_ENABLE]) {
/* HW phys. presence may not be asserted... */
return 0;
}
if (!pf.flags[PERM_FLAG_IDX_PHYSICAL_PRESENCE_LIFETIME_LOCK]
&& !pf.flags[PERM_FLAG_IDX_PHYSICAL_PRESENCE_CMD_ENABLE]) {
tpm_build_and_send_cmd(0, TPM_ORD_PhysicalPresence,
PhysicalPresence_CMD_ENABLE,
sizeof(PhysicalPresence_CMD_ENABLE),
TPM_DURATION_TYPE_SHORT);
return tpm_build_and_send_cmd(0, TPM_ORD_PhysicalPresence,
PhysicalPresence_PRESENT,
sizeof(PhysicalPresence_PRESENT),
TPM_DURATION_TYPE_SHORT);
}
return -1;
}
static int
tpm12_startup(void)
{
dprintf(DEBUG_tcg, "TCGBIOS: Starting with TPM_Startup(ST_CLEAR)\n");
int ret = tpm_build_and_send_cmd(0, TPM_ORD_Startup,
Startup_ST_CLEAR,
sizeof(Startup_ST_CLEAR),
TPM_DURATION_TYPE_SHORT);
if (CONFIG_COREBOOT && ret == TPM_INVALID_POSTINIT)
/* with other firmware on the system the TPM may already have been
* initialized
*/
ret = 0;
if (ret)
goto err_exit;
/* assertion of physical presence is only possible after startup */
ret = tpm12_assert_physical_presence();
if (!ret)
TPM_has_physical_presence = 1;
ret = tpm12_determine_timeouts();
if (ret)
return -1;
ret = tpm_build_and_send_cmd(0, TPM_ORD_SelfTestFull, NULL, 0,
TPM_DURATION_TYPE_LONG);
if (ret)
goto err_exit;
ret = tpm_build_and_send_cmd(3, TSC_ORD_ResetEstablishmentBit, NULL, 0,
TPM_DURATION_TYPE_SHORT);
if (ret && ret != TPM_BAD_LOCALITY)
goto err_exit;
return 0;
err_exit:
dprintf(DEBUG_tcg, "TCGBIOS: TPM malfunctioning (line %d).\n", __LINE__);
tpm_set_failure();
return -1;
}
static int
tpm20_startup(void)
{
tpm20_set_timeouts();
int ret = tpm_build_and_send_cmd(0, TPM2_CC_Startup,
Startup_SU_CLEAR,
sizeof(Startup_SU_CLEAR),
TPM_DURATION_TYPE_SHORT);
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_Startup(SU_CLEAR) = 0x%08x\n",
ret);
if (CONFIG_COREBOOT && ret == TPM2_RC_INITIALIZE)
/* with other firmware on the system the TPM may already have been
* initialized
*/
ret = 0;
if (ret)
goto err_exit;
ret = tpm_build_and_send_cmd(0, TPM2_CC_SelfTest,
TPM2_SelfTest_YES,
sizeof(TPM2_SelfTest_YES),
TPM_DURATION_TYPE_LONG);
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_SelfTest = 0x%08x\n",
ret);
if (ret)
goto err_exit;
ret = tpm20_get_pcrbanks();
if (ret)
goto err_exit;
ret = tpm20_write_EfiSpecIdEventStruct();
if (ret)
goto err_exit;
return 0;
err_exit:
dprintf(DEBUG_tcg, "TCGBIOS: TPM malfunctioning (line %d).\n", __LINE__);
tpm_set_failure();
return -1;
}
static int
tpm_startup(void)
{
switch (TPM_version) {
case TPM_VERSION_1_2:
return tpm12_startup();
case TPM_VERSION_2:
return tpm20_startup();
}
return -1;
}
void
tpm_setup(void)
{
if (!CONFIG_TCGBIOS)
return;
TPM_version = tpmhw_probe();
if (TPM_version == TPM_VERSION_NONE)
return;
dprintf(DEBUG_tcg,
"TCGBIOS: Detected a TPM %s.\n",
(TPM_version == TPM_VERSION_1_2) ? "1.2" : "2");
int ret = tpm_tcpa_probe();
if (ret)
return;
TPM_working = 1;
if (runningOnXen())
return;
ret = tpm_startup();
if (ret)
return;
tpm_smbios_measure();
tpm_add_action(2, "Start Option ROM Scan");
}
static int
tpm20_stirrandom(void)
{
struct tpm2b_stir stir = {
.size = cpu_to_be16(sizeof(stir.stir)),
.stir = rdtscll(),
};
/* set more bits to stir with */
stir.stir += swab64(rdtscll());
int ret = tpm_build_and_send_cmd(0, TPM2_CC_StirRandom,
(u8 *)&stir, sizeof(stir),
TPM_DURATION_TYPE_SHORT);
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_StirRandom = 0x%08x\n",
ret);
return ret;
}
static int
tpm20_getrandom(u8 *buf, u16 buf_len)
{
struct tpm2_res_getrandom rsp;
if (buf_len > sizeof(rsp.rnd.buffer))
return -1;
struct tpm2_req_getrandom trgr = {
.hdr.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
.hdr.totlen = cpu_to_be32(sizeof(trgr)),
.hdr.ordinal = cpu_to_be32(TPM2_CC_GetRandom),
.bytesRequested = cpu_to_be16(buf_len),
};
u32 resp_length = sizeof(rsp);
int ret = tpmhw_transmit(0, &trgr.hdr, &rsp, &resp_length,
TPM_DURATION_TYPE_MEDIUM);
if (ret || resp_length != sizeof(rsp) || rsp.hdr.errcode)
ret = -1;
else
memcpy(buf, rsp.rnd.buffer, buf_len);
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_GetRandom = 0x%08x\n",
ret);
return ret;
}
static int
tpm20_hierarchychangeauth(u8 auth[20])
{
struct tpm2_req_hierarchychangeauth trhca = {
.hdr.tag = cpu_to_be16(TPM2_ST_SESSIONS),
.hdr.totlen = cpu_to_be32(sizeof(trhca)),
.hdr.ordinal = cpu_to_be32(TPM2_CC_HierarchyChangeAuth),
.authhandle = cpu_to_be32(TPM2_RH_PLATFORM),
.authblocksize = cpu_to_be32(sizeof(trhca.authblock)),
.authblock = {
.handle = cpu_to_be32(TPM2_RS_PW),
.noncesize = cpu_to_be16(0),
.contsession = TPM2_YES,
.pwdsize = cpu_to_be16(0),
},
.newAuth = {
.size = cpu_to_be16(sizeof(trhca.newAuth.buffer)),
},
};
memcpy(trhca.newAuth.buffer, auth, sizeof(trhca.newAuth.buffer));
struct tpm_rsp_header rsp;
u32 resp_length = sizeof(rsp);
int ret = tpmhw_transmit(0, &trhca.hdr, &rsp, &resp_length,
TPM_DURATION_TYPE_MEDIUM);
if (ret || resp_length != sizeof(rsp) || rsp.errcode)
ret = -1;
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_HierarchyChangeAuth = 0x%08x\n",
ret);
return ret;
}
static void
tpm20_prepboot(void)
{
int ret = tpm20_stirrandom();
if (ret)
goto err_exit;
u8 auth[20];
ret = tpm20_getrandom(&auth[0], sizeof(auth));
if (ret)
goto err_exit;
ret = tpm20_hierarchychangeauth(auth);
if (ret)
goto err_exit;
return;
err_exit:
dprintf(DEBUG_tcg, "TCGBIOS: TPM malfunctioning (line %d).\n", __LINE__);
tpm_set_failure();
}
void
tpm_prepboot(void)
{
if (!CONFIG_TCGBIOS)
return;
switch (TPM_version) {
case TPM_VERSION_1_2:
if (TPM_has_physical_presence)
tpm_build_and_send_cmd(0, TPM_ORD_PhysicalPresence,
PhysicalPresence_NOT_PRESENT_LOCK,
sizeof(PhysicalPresence_NOT_PRESENT_LOCK),
TPM_DURATION_TYPE_SHORT);
break;
case TPM_VERSION_2:
tpm20_prepboot();
break;
}
tpm_add_action(4, "Calling INT 19h");
tpm_add_event_separators();
}
/*
* Add measurement to the log about an option rom
*/
void
tpm_option_rom(const void *addr, u32 len)
{
if (!tpm_is_working())
return;
struct pcctes_romex pcctes = {
.eventid = 7,
.eventdatasize = sizeof(u16) + sizeof(u16) + SHA1_BUFSIZE,
};
sha1((const u8 *)addr, len, pcctes.digest);
tpm_add_measurement_to_log(2,
EV_EVENT_TAG,
(const char *)&pcctes, sizeof(pcctes),
(u8 *)&pcctes, sizeof(pcctes));
}
void
tpm_add_bcv(u32 bootdrv, const u8 *addr, u32 length)
{
if (!tpm_is_working())
return;
if (length < 0x200)
return;
const char *string = "Booting BCV device 00h (Floppy)";
if (bootdrv == 0x80)
string = "Booting BCV device 80h (HDD)";
tpm_add_action(4, string);
/* specs: see section 'Hard Disk Device or Hard Disk-Like Devices' */
/* equivalent to: dd if=/dev/hda ibs=1 count=440 | sha1sum */
string = "MBR";
tpm_add_measurement_to_log(4, EV_IPL,
string, strlen(string),
addr, 0x1b8);
/* equivalent to: dd if=/dev/hda ibs=1 count=72 skip=440 | sha1sum */
string = "MBR PARTITION_TABLE";
tpm_add_measurement_to_log(5, EV_IPL_PARTITION_DATA,
string, strlen(string),
addr + 0x1b8, 0x48);
}
void
tpm_add_cdrom(u32 bootdrv, const u8 *addr, u32 length)
{
if (!tpm_is_working())
return;
tpm_add_action(4, "Booting from CD ROM device");
/* specs: see section 'El Torito' */
const char *string = "EL TORITO IPL";
tpm_add_measurement_to_log(4, EV_IPL,
string, strlen(string),
addr, length);
}
void
tpm_add_cdrom_catalog(const u8 *addr, u32 length)
{
if (!tpm_is_working())
return;
tpm_add_action(4, "Booting from CD ROM device");
/* specs: see section 'El Torito' */
const char *string = "BOOT CATALOG";
tpm_add_measurement_to_log(5, EV_IPL_PARTITION_DATA,
string, strlen(string),
addr, length);
}
void
tpm_s3_resume(void)
{
if (!tpm_is_working())
return;
dprintf(DEBUG_tcg, "TCGBIOS: Resuming with TPM_Startup(ST_STATE)\n");
int ret = -1;
switch (TPM_version) {
case TPM_VERSION_1_2:
ret = tpm_build_and_send_cmd(0, TPM_ORD_Startup,
Startup_ST_STATE,
sizeof(Startup_ST_STATE),
TPM_DURATION_TYPE_SHORT);
break;
case TPM_VERSION_2:
ret = tpm_build_and_send_cmd(0, TPM2_CC_Startup,
Startup_SU_STATE,
sizeof(Startup_SU_STATE),
TPM_DURATION_TYPE_SHORT);
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_Startup(SU_STATE) = 0x%08x\n",
ret);
if (ret)
goto err_exit;
ret = tpm_build_and_send_cmd(0, TPM2_CC_SelfTest,
TPM2_SelfTest_YES, sizeof(TPM2_SelfTest_YES),
TPM_DURATION_TYPE_LONG);
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_SelfTest() = 0x%08x\n",
ret);
break;
}
if (ret)
goto err_exit;
return;
err_exit:
dprintf(DEBUG_tcg, "TCGBIOS: TPM malfunctioning (line %d).\n", __LINE__);
tpm_set_failure();
}
/****************************************************************
* BIOS interface
****************************************************************/
u8 TPM_interface_shutdown VARLOW;
static inline void *input_buf32(struct bregs *regs)
{
return MAKE_FLATPTR(regs->es, regs->di);
}
static inline void *output_buf32(struct bregs *regs)
{
return MAKE_FLATPTR(regs->ds, regs->si);
}
static u32
hash_log_extend(struct pcpes *pcpes, const void *hashdata, u32 hashdata_length
, void *event, int extend)
{
if (pcpes->pcrindex >= 24)
return TCG_INVALID_INPUT_PARA;
if (hashdata)
sha1(hashdata, hashdata_length, pcpes->digest);
struct tpm_log_entry le = {
.hdr.pcrindex = pcpes->pcrindex,
.hdr.eventtype = pcpes->eventtype,
};
int digest_len = tpm_build_digest(&le, pcpes->digest);
if (digest_len < 0)
return TCG_GENERAL_ERROR;
if (extend) {
int ret = tpm_extend(&le, digest_len);
if (ret)
return TCG_TCG_COMMAND_ERROR;
}
int ret = tpm_log_event(&le.hdr, digest_len
, pcpes->event, pcpes->eventdatasize);
if (ret)
return TCG_PC_LOGOVERFLOW;
return 0;
}
static u32
hash_log_extend_event_int(const struct hleei_short *hleei_s,
struct hleeo *hleeo)
{
u32 rc = 0;
struct hleei_long *hleei_l = (struct hleei_long *)hleei_s;
const void *logdataptr;
u32 logdatalen;
struct pcpes *pcpes;
u32 pcrindex;
/* short or long version? */
switch (hleei_s->ipblength) {
case sizeof(struct hleei_short):
/* short */
logdataptr = hleei_s->logdataptr;
logdatalen = hleei_s->logdatalen;
pcrindex = hleei_s->pcrindex;
break;
case sizeof(struct hleei_long):
/* long */
logdataptr = hleei_l->logdataptr;
logdatalen = hleei_l->logdatalen;
pcrindex = hleei_l->pcrindex;
break;
default:
/* bad input block */
rc = TCG_INVALID_INPUT_PARA;
goto err_exit;
}
pcpes = (struct pcpes *)logdataptr;
if (pcpes->pcrindex != pcrindex
|| logdatalen != sizeof(*pcpes) + pcpes->eventdatasize) {
rc = TCG_INVALID_INPUT_PARA;
goto err_exit;
}
rc = hash_log_extend(pcpes, hleei_s->hashdataptr, hleei_s->hashdatalen
, pcpes->event, 1);
if (rc)
goto err_exit;
hleeo->opblength = sizeof(struct hleeo);
hleeo->reserved = 0;
hleeo->eventnumber = tpm_state.entry_count;
memcpy(hleeo->digest, pcpes->digest, sizeof(hleeo->digest));
err_exit:
if (rc != 0) {
hleeo->opblength = 4;
hleeo->reserved = 0;
}
return rc;
}
static u32
pass_through_to_tpm_int(struct pttti *pttti, struct pttto *pttto)
{
u32 rc = 0;
struct tpm_req_header *trh = (void*)pttti->tpmopin;
if (pttti->ipblength < sizeof(struct pttti) + sizeof(*trh)
|| pttti->ipblength != sizeof(struct pttti) + be32_to_cpu(trh->totlen)
|| pttti->opblength < sizeof(struct pttto)) {
rc = TCG_INVALID_INPUT_PARA;
goto err_exit;
}
u16 tag = be16_to_cpu(trh->tag);
switch (TPM_version) {
case TPM_VERSION_1_2:
if (tag != TPM_TAG_RQU_CMD && tag != TPM_TAG_RQU_AUTH1_CMD
&& tag != TPM_TAG_RQU_AUTH2_CMD) {
rc = TCG_INVALID_INPUT_PARA;
goto err_exit;
}
break;
case TPM_VERSION_2:
if (tag != TPM2_ST_NO_SESSIONS && tag != TPM2_ST_SESSIONS) {
rc = TCG_INVALID_INPUT_PARA;
goto err_exit;
}
}
u32 resbuflen = pttti->opblength - offsetof(struct pttto, tpmopout);
int ret = tpmhw_transmit(0, trh, pttto->tpmopout, &resbuflen,
TPM_DURATION_TYPE_LONG /* worst case */);
if (ret) {
rc = TCG_FATAL_COM_ERROR;
goto err_exit;
}
pttto->opblength = offsetof(struct pttto, tpmopout) + resbuflen;
pttto->reserved = 0;
err_exit:
if (rc != 0) {
pttto->opblength = 4;
pttto->reserved = 0;
}
return rc;
}
static u32
shutdown_preboot_interface(void)
{
TPM_interface_shutdown = 1;
return 0;
}
static u32
hash_log_event_int(const struct hlei *hlei, struct hleo *hleo)
{
u32 rc = 0;
u16 size;
struct pcpes *pcpes;
size = hlei->ipblength;
if (size != sizeof(*hlei)) {
rc = TCG_INVALID_INPUT_PARA;
goto err_exit;
}
pcpes = (struct pcpes *)hlei->logdataptr;
if (pcpes->pcrindex != hlei->pcrindex
|| pcpes->eventtype != hlei->logeventtype
|| hlei->logdatalen != sizeof(*pcpes) + pcpes->eventdatasize) {
rc = TCG_INVALID_INPUT_PARA;
goto err_exit;
}
rc = hash_log_extend(pcpes, hlei->hashdataptr, hlei->hashdatalen
, pcpes->event, 0);
if (rc)
goto err_exit;
/* updating the log was fine */
hleo->opblength = sizeof(struct hleo);
hleo->reserved = 0;
hleo->eventnumber = tpm_state.entry_count;
err_exit:
if (rc != 0) {
hleo->opblength = 2;
hleo->reserved = 0;
}
return rc;
}
static u32
hash_all_int(const struct hai *hai, u8 *hash)
{
if (hai->ipblength != sizeof(struct hai) ||
hai->hashdataptr == 0 ||
hai->hashdatalen == 0 ||
hai->algorithmid != TPM_ALG_SHA)
return TCG_INVALID_INPUT_PARA;
sha1((const u8 *)hai->hashdataptr, hai->hashdatalen, hash);
return 0;
}
static u32
tss_int(struct ti *ti, struct to *to)
{
to->opblength = sizeof(struct to);
to->reserved = 0;
return TCG_PC_UNSUPPORTED;
}
static u32
compact_hash_log_extend_event_int(u8 *buffer,
u32 info,
u32 length,
u32 pcrindex,
u32 *edx_ptr)
{
struct pcpes pcpes = {
.pcrindex = pcrindex,
.eventtype = EV_COMPACT_HASH,
.eventdatasize = sizeof(info),
};
u32 rc = hash_log_extend(&pcpes, buffer, length, &info, 1);
if (rc)
return rc;
*edx_ptr = tpm_state.entry_count;
return 0;
}
void VISIBLE32FLAT
tpm_interrupt_handler32(struct bregs *regs)
{
if (!CONFIG_TCGBIOS)
return;
set_cf(regs, 0);
if (TPM_interface_shutdown && regs->al) {
regs->eax = TCG_INTERFACE_SHUTDOWN;
return;
}
switch ((enum irq_ids)regs->al) {
case TCG_StatusCheck:
if (!tpmhw_is_present()) {
/* no TPM available */
regs->eax = TCG_PC_TPM_NOT_PRESENT;
} else {
regs->eax = 0;
regs->ebx = TCG_MAGIC;
regs->ch = TCG_VERSION_MAJOR;
regs->cl = TCG_VERSION_MINOR;
regs->edx = 0x0;
regs->esi = (u32)tpm_state.log_area_start_address;
regs->edi = (u32)tpm_state.log_area_last_entry;
}
break;
case TCG_HashLogExtendEvent:
regs->eax =
hash_log_extend_event_int(
(struct hleei_short *)input_buf32(regs),
(struct hleeo *)output_buf32(regs));
break;
case TCG_PassThroughToTPM:
regs->eax =
pass_through_to_tpm_int((struct pttti *)input_buf32(regs),
(struct pttto *)output_buf32(regs));
break;
case TCG_ShutdownPreBootInterface:
regs->eax = shutdown_preboot_interface();
break;
case TCG_HashLogEvent:
regs->eax = hash_log_event_int((struct hlei*)input_buf32(regs),
(struct hleo*)output_buf32(regs));
break;
case TCG_HashAll:
regs->eax =
hash_all_int((struct hai*)input_buf32(regs),
(u8 *)output_buf32(regs));
break;
case TCG_TSS:
regs->eax = tss_int((struct ti*)input_buf32(regs),
(struct to*)output_buf32(regs));
break;
case TCG_CompactHashLogExtendEvent:
regs->eax =
compact_hash_log_extend_event_int((u8 *)input_buf32(regs),
regs->esi,
regs->ecx,
regs->edx,
&regs->edx);
break;
default:
set_cf(regs, 1);
}
return;
}
/****************************************************************
* TPM Configuration Menu
****************************************************************/
static int
tpm12_read_has_owner(int *has_owner)
{
struct tpm_res_getcap_ownerauth oauth;
int ret = tpm12_get_capability(TPM_CAP_PROPERTY, TPM_CAP_PROP_OWNER
, &oauth.hdr, sizeof(oauth));
if (ret)
return -1;
*has_owner = oauth.flag;
return 0;
}
static int
tpm12_enable_tpm(int enable, int verbose)
{
struct tpm_permanent_flags pf;
int ret = tpm12_read_permanent_flags((char *)&pf, sizeof(pf));
if (ret)
return -1;
if (pf.flags[PERM_FLAG_IDX_DISABLE] && !enable)
return 0;
ret = tpm_build_and_send_cmd(0, enable ? TPM_ORD_PhysicalEnable
: TPM_ORD_PhysicalDisable,
NULL, 0, TPM_DURATION_TYPE_SHORT);
if (ret) {
if (enable)
dprintf(DEBUG_tcg, "TCGBIOS: Enabling the TPM failed.\n");
else
dprintf(DEBUG_tcg, "TCGBIOS: Disabling the TPM failed.\n");
}
return ret;
}
static int
tpm12_activate_tpm(int activate, int allow_reset, int verbose)
{
struct tpm_permanent_flags pf;
int ret = tpm12_read_permanent_flags((char *)&pf, sizeof(pf));
if (ret)
return -1;
if (pf.flags[PERM_FLAG_IDX_DEACTIVATED] && !activate)
return 0;
if (pf.flags[PERM_FLAG_IDX_DISABLE])
return 0;
ret = tpm_build_and_send_cmd(0, TPM_ORD_PhysicalSetDeactivated,
activate ? CommandFlag_FALSE
: CommandFlag_TRUE,
activate ? sizeof(CommandFlag_FALSE)
: sizeof(CommandFlag_TRUE),
TPM_DURATION_TYPE_SHORT);
if (ret)
return ret;
if (activate && allow_reset) {
if (verbose) {
printf("Requiring a reboot to activate the TPM.\n");
msleep(2000);
}
reset();
}
return 0;
}
static int
tpm12_enable_activate(int allow_reset, int verbose)
{
int ret = tpm12_enable_tpm(1, verbose);
if (ret)
return ret;
return tpm12_activate_tpm(1, allow_reset, verbose);
}
static int
tpm12_force_clear(int enable_activate_before, int enable_activate_after,
int verbose)
{
int has_owner;
int ret = tpm12_read_has_owner(&has_owner);
if (ret)
return -1;
if (!has_owner) {
if (verbose)
printf("TPM does not have an owner.\n");
return 0;
}
if (enable_activate_before) {
ret = tpm12_enable_activate(0, verbose);
if (ret) {
dprintf(DEBUG_tcg,
"TCGBIOS: Enabling/activating the TPM failed.\n");
return ret;
}
}
ret = tpm_build_and_send_cmd(0, TPM_ORD_ForceClear,
NULL, 0, TPM_DURATION_TYPE_SHORT);
if (ret)
return ret;
if (!enable_activate_after) {
if (verbose)
printf("Owner successfully cleared.\n"
"You will need to enable/activate the TPM again.\n\n");
return 0;
}
return tpm12_enable_activate(1, verbose);
}
static int
tpm12_set_owner_install(int allow, int verbose)
{
int has_owner;
int ret = tpm12_read_has_owner(&has_owner);
if (ret)
return -1;
if (has_owner) {
if (verbose)
printf("Must first remove owner.\n");
return 0;
}
struct tpm_permanent_flags pf;
ret = tpm12_read_permanent_flags((char *)&pf, sizeof(pf));
if (ret)
return -1;
if (pf.flags[PERM_FLAG_IDX_DISABLE]) {
if (verbose)
printf("TPM must first be enable.\n");
return 0;
}
ret = tpm_build_and_send_cmd(0, TPM_ORD_SetOwnerInstall,
(allow) ? CommandFlag_TRUE
: CommandFlag_FALSE,
sizeof(CommandFlag_TRUE),
TPM_DURATION_TYPE_SHORT);
if (ret)
return ret;
if (verbose)
printf("Installation of owner %s.\n", allow ? "enabled" : "disabled");
return 0;
}
static int
tpm12_process_cfg(tpm_ppi_code msgCode, int verbose)
{
int ret = 0;
switch (msgCode) {
case TPM_PPI_OP_NOOP: /* no-op */
break;
case TPM_PPI_OP_ENABLE:
ret = tpm12_enable_tpm(1, verbose);
break;
case TPM_PPI_OP_DISABLE:
ret = tpm12_enable_tpm(0, verbose);
break;
case TPM_PPI_OP_ACTIVATE:
ret = tpm12_activate_tpm(1, 1, verbose);
break;
case TPM_PPI_OP_DEACTIVATE:
ret = tpm12_activate_tpm(0, 1, verbose);
break;
case TPM_PPI_OP_CLEAR:
ret = tpm12_force_clear(1, 0, verbose);
break;
case TPM_PPI_OP_SET_OWNERINSTALL_TRUE:
ret = tpm12_set_owner_install(1, verbose);
break;
case TPM_PPI_OP_SET_OWNERINSTALL_FALSE:
ret = tpm12_set_owner_install(0, verbose);
break;
default:
break;
}
if (ret)
printf("Op %d: An error occurred: 0x%x\n", msgCode, ret);
return ret;
}
static int
tpm20_clearcontrol(u8 disable, int verbose)
{
struct tpm2_req_clearcontrol trc = {
.hdr.tag = cpu_to_be16(TPM2_ST_SESSIONS),
.hdr.totlen = cpu_to_be32(sizeof(trc)),
.hdr.ordinal = cpu_to_be32(TPM2_CC_ClearControl),
.authhandle = cpu_to_be32(TPM2_RH_PLATFORM),
.authblocksize = cpu_to_be32(sizeof(trc.authblock)),
.authblock = {
.handle = cpu_to_be32(TPM2_RS_PW),
.noncesize = cpu_to_be16(0),
.contsession = TPM2_YES,
.pwdsize = cpu_to_be16(0),
},
.disable = disable,
};
struct tpm_rsp_header rsp;
u32 resp_length = sizeof(rsp);
int ret = tpmhw_transmit(0, &trc.hdr, &rsp, &resp_length,
TPM_DURATION_TYPE_SHORT);
if (ret || resp_length != sizeof(rsp) || rsp.errcode)
ret = -1;
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_ClearControl = 0x%08x\n",
ret);
return ret;
}
static int
tpm20_clear(void)
{
struct tpm2_req_clear trq = {
.hdr.tag = cpu_to_be16(TPM2_ST_SESSIONS),
.hdr.totlen = cpu_to_be32(sizeof(trq)),
.hdr.ordinal = cpu_to_be32(TPM2_CC_Clear),
.authhandle = cpu_to_be32(TPM2_RH_PLATFORM),
.authblocksize = cpu_to_be32(sizeof(trq.authblock)),
.authblock = {
.handle = cpu_to_be32(TPM2_RS_PW),
.noncesize = cpu_to_be16(0),
.contsession = TPM2_YES,
.pwdsize = cpu_to_be16(0),
},
};
struct tpm_rsp_header rsp;
u32 resp_length = sizeof(rsp);
int ret = tpmhw_transmit(0, &trq.hdr, &rsp, &resp_length,
TPM_DURATION_TYPE_MEDIUM);
if (ret || resp_length != sizeof(rsp) || rsp.errcode)
ret = -1;
dprintf(DEBUG_tcg, "TCGBIOS: Return value from sending TPM2_CC_Clear = 0x%08x\n",
ret);
return ret;
}
static int
tpm20_process_cfg(tpm_ppi_code msgCode, int verbose)
{
int ret = 0;
switch (msgCode) {
case TPM_PPI_OP_NOOP: /* no-op */
break;
case TPM_PPI_OP_CLEAR:
ret = tpm20_clearcontrol(0, verbose);
if (!ret)
ret = tpm20_clear();
break;
}
if (ret)
printf("Op %d: An error occurred: 0x%x\n", msgCode, ret);
return ret;
}
static int
tpm12_get_tpm_state(void)
{
int state = 0;
struct tpm_permanent_flags pf;
int has_owner;
if (tpm12_read_permanent_flags((char *)&pf, sizeof(pf)) ||
tpm12_read_has_owner(&has_owner))
return ~0;
if (!pf.flags[PERM_FLAG_IDX_DISABLE])
state |= TPM_STATE_ENABLED;
if (!pf.flags[PERM_FLAG_IDX_DEACTIVATED])
state |= TPM_STATE_ACTIVE;
if (has_owner) {
state |= TPM_STATE_OWNED;
} else {
if (pf.flags[PERM_FLAG_IDX_OWNERSHIP])
state |= TPM_STATE_OWNERINSTALL;
}
return state;
}
static void
tpm12_show_tpm_menu(int state, int next_scancodes[7])
{
int i = 0;
printf("\nThe current state of the TPM is:\n");
if (state & TPM_STATE_ENABLED)
printf(" Enabled");
else
printf(" Disabled");
if (state & TPM_STATE_ACTIVE)
printf(" and active\n");
else
printf(" and deactivated\n");
if (state & TPM_STATE_OWNED)
printf(" Ownership has been taken\n");
else {
printf(" Ownership has not been taken\n");
if (state & TPM_STATE_OWNERINSTALL)
printf(" A user can take ownership of the TPM\n");
else
printf(" Taking ownership of the TPM has been disabled\n");
}
if ((state & (TPM_STATE_ENABLED | TPM_STATE_ACTIVE)) !=
(TPM_STATE_ENABLED | TPM_STATE_ACTIVE)) {
printf("\nNote: To make use of all functionality, the TPM must be "
"enabled and active.\n");
}
printf("\nAvailable options are:\n");
if (state & TPM_STATE_ENABLED) {
printf(" d. Disable the TPM\n");
next_scancodes[i++] = 32;
if (state & TPM_STATE_ACTIVE) {
printf(" v. Deactivate the TPM\n");
next_scancodes[i++] = 47;
if (state & TPM_STATE_OWNERINSTALL) {
printf(" p. Prevent installation of an owner\n");
next_scancodes[i++] = 25;
} else {
printf(" s. Allow installation of an owner\n");
next_scancodes[i++] = 31;
}
} else {
printf(" a. Activate the TPM\n");
next_scancodes[i++] = 30;
}
} else {
printf(" e. Enable the TPM\n");
next_scancodes[i++] = 18;
}
if (state & TPM_STATE_OWNED) {
printf(" c. Clear ownership\n");
next_scancodes[i++] = 46;
}
next_scancodes[i++] = 0;
}
static void
tpm12_menu(void)
{
int scancode, next_scancodes[7];
tpm_ppi_code msgCode;
int state = 0, i;
int waitkey;
printf("The Trusted Platform Module (TPM) is a hardware device in "
"this machine.\n"
"It can help verify the integrity of system software.\n\n");
for (;;) {
if ((state = tpm12_get_tpm_state()) != ~0) {
tpm12_show_tpm_menu(state, next_scancodes);
} else {
printf("TPM is not working correctly.\n");
return;
}
printf("\nIf no change is desired or if this menu was reached by "
"mistake, press ESC to\n"
"reboot the machine.\n");
msgCode = TPM_PPI_OP_NOOP;
waitkey = 1;
while (waitkey) {
while ((scancode = get_keystroke(1000)) == ~0)
;
switch (scancode) {
case 1:
// ESC
reset();
break;
case 18: /* e. enable */
msgCode = TPM_PPI_OP_ENABLE;
break;
case 32: /* d. disable */
msgCode = TPM_PPI_OP_DISABLE;
break;
case 30: /* a. activate */
msgCode = TPM_PPI_OP_ACTIVATE;
break;
case 47: /* v. deactivate */
msgCode = TPM_PPI_OP_DEACTIVATE;
break;
case 46: /* c. clear owner */
msgCode = TPM_PPI_OP_CLEAR;
break;
case 25: /* p. prevent ownerinstall */
msgCode = TPM_PPI_OP_SET_OWNERINSTALL_FALSE;
break;
case 31: /* s. allow ownerinstall */
msgCode = TPM_PPI_OP_SET_OWNERINSTALL_TRUE;
break;
default:
continue;
}
/*
* Using the next_scancodes array, check whether the
* pressed key is currently a valid option.
*/
for (i = 0; i < sizeof(next_scancodes); i++) {
if (next_scancodes[i] == 0)
break;
if (next_scancodes[i] == scancode) {
tpm12_process_cfg(msgCode, 1);
waitkey = 0;
break;
}
}
}
}
}
static void
tpm20_menu(void)
{
int scan_code;
tpm_ppi_code msgCode;
for (;;) {
printf("1. Clear TPM\n");
printf("\nIf no change is desired or if this menu was reached by "
"mistake, press ESC to\n"
"reboot the machine.\n");
msgCode = TPM_PPI_OP_NOOP;
while ((scan_code = get_keystroke(1000)) == ~0)
;
switch (scan_code) {
case 1:
// ESC
reset();
break;
case 2:
msgCode = TPM_PPI_OP_CLEAR;
break;
default:
continue;
}
tpm20_process_cfg(msgCode, 0);
}
}
void
tpm_menu(void)
{
if (!CONFIG_TCGBIOS)
return;
while (get_keystroke(0) >= 0)
;
wait_threads();
switch (TPM_version) {
case TPM_VERSION_1_2:
tpm12_menu();
break;
case TPM_VERSION_2:
tpm20_menu();
break;
}
}