ims-volte-vowifi
/
strongswan
9
0
Fork 0
Code Pull Requests Releases Activity
strongswan/src/libtpmtss/tpm_tss_tss2_v2.c

1191 lines
29 KiB
C
Raw Blame History

/*
* Copyright (C) 2018 Andreas Steffen
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "tpm_tss_tss2.h"
#include "tpm_tss_tss2_names.h"
#ifdef TSS_TSS2_V2
#include <asn1/asn1.h>
#include <asn1/oid.h>
#include <bio/bio_reader.h>
#include <tss2/tss2_sys.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#define LABEL "TPM 2.0 -"
#define PLATFORM_PCR 24
typedef struct private_tpm_tss_tss2_t private_tpm_tss_tss2_t;
/**
* Private data of an tpm_tss_tss2_t object.
*/
struct private_tpm_tss_tss2_t {
/**
* Public tpm_tss_tss2_t interface.
*/
tpm_tss_t public;
/**
* TCTI context
*/
TSS2_TCTI_CONTEXT *tcti_context;
/**
* SYS context
*/
TSS2_SYS_CONTEXT *sys_context;
/**
* Number of supported algorithms
*/
size_t supported_algs_count;
/**
* List of supported algorithms
*/
TPM2_ALG_ID supported_algs[TPM2_PT_ALGORITHM_SET];
};
/**
* Global TCTI dynamic library handle and init function
*/
static void *tcti_handle;
static TSS2_TCTI_INIT_FUNC tcti_init;
static char *tcti_opts;
/**
* Empty AUTH_COMMAND
*/
static const TPMS_AUTH_COMMAND auth_cmd_empty;
/**
* Convert hash algorithm to TPM2_ALG_ID
*/
static TPM2_ALG_ID hash_alg_to_tpm_alg_id(hash_algorithm_t alg)
{
switch (alg)
{
case HASH_SHA1:
return TPM2_ALG_SHA1;
case HASH_SHA256:
return TPM2_ALG_SHA256;
case HASH_SHA384:
return TPM2_ALG_SHA384;
case HASH_SHA512:
return TPM2_ALG_SHA512;
default:
return TPM2_ALG_ERROR;
}
}
/**
* Convert TPM2_ALG_ID to hash algorithm
*/
static hash_algorithm_t hash_alg_from_tpm_alg_id(TPM2_ALG_ID alg)
{
switch (alg)
{
case TPM2_ALG_SHA1:
return HASH_SHA1;
case TPM2_ALG_SHA256:
return HASH_SHA256;
case TPM2_ALG_SHA384:
return HASH_SHA384;
case TPM2_ALG_SHA512:
return HASH_SHA512;
default:
return HASH_UNKNOWN;
}
}
/**
* Check if an algorithm given by its TPM2_ALG_ID is supported by the TPM
*/
static bool is_supported_alg(private_tpm_tss_tss2_t *this, TPM2_ALG_ID alg_id)
{
int i;
if (alg_id == TPM2_ALG_ERROR)
{
return FALSE;
}
for (i = 0; i < this->supported_algs_count; i++)
{
if (this->supported_algs[i] == alg_id)
{
return TRUE;
}
}
return FALSE;
}
/**
* Get a list of supported algorithms
*/
static bool get_algs_capability(private_tpm_tss_tss2_t *this)
{
TPMS_CAPABILITY_DATA cap_data;
TPMS_TAGGED_PROPERTY tp;
TPMI_YES_NO more_data;
TPM2_ALG_ID alg;
uint32_t rval, i, offset, revision = 0, year = 0;
size_t len = BUF_LEN;
char buf[BUF_LEN], manufacturer[5], vendor_string[17];
char *pos = buf;
int written;
/* get fixed properties */
rval = Tss2_Sys_GetCapability(this->sys_context, 0, TPM2_CAP_TPM_PROPERTIES,
TPM2_PT_FIXED, TPM2_MAX_TPM_PROPERTIES,
&more_data, &cap_data, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s GetCapability failed for TPM2_CAP_TPM_PROPERTIES: 0x%06x",
LABEL, rval);
return FALSE;
}
memset(manufacturer, '\0', sizeof(manufacturer));
memset(vendor_string, '\0', sizeof(vendor_string));
/* print fixed properties */
for (i = 0; i < cap_data.data.tpmProperties.count; i++)
{
tp = cap_data.data.tpmProperties.tpmProperty[i];
switch (tp.property)
{
case TPM2_PT_REVISION:
revision = tp.value;
break;
case TPM2_PT_YEAR:
year = tp.value;
break;
case TPM2_PT_MANUFACTURER:
htoun32(manufacturer, tp.value);
break;
case TPM2_PT_VENDOR_STRING_1:
case TPM2_PT_VENDOR_STRING_2:
case TPM2_PT_VENDOR_STRING_3:
case TPM2_PT_VENDOR_STRING_4:
offset = 4 * (tp.property - TPM2_PT_VENDOR_STRING_1);
htoun32(vendor_string + offset, tp.value);
break;
default:
break;
}
}
DBG2(DBG_PTS, "%s manufacturer: %s (%s) rev: %05.2f %u", LABEL, manufacturer,
vendor_string, (float)revision/100, year);
/* get supported algorithms */
rval = Tss2_Sys_GetCapability(this->sys_context, 0, TPM2_CAP_ALGS,
0, TPM2_PT_ALGORITHM_SET, &more_data, &cap_data, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s GetCapability failed for TPM2_CAP_ALGS: 0x%06x",
LABEL, rval);
return FALSE;
}
/* Number of supported algorithms */
this->supported_algs_count = cap_data.data.algorithms.count;
/* store and print supported algorithms */
for (i = 0; i < this->supported_algs_count; i++)
{
alg = cap_data.data.algorithms.algProperties[i].alg;
this->supported_algs[i] = alg;
written = snprintf(pos, len, " %N", tpm_alg_id_names, alg);
if (written < 0 || written >= len)
{
break;
}
pos += written;
len -= written;
}
DBG2(DBG_PTS, "%s algorithms:%s", LABEL, buf);
/* get supported ECC curves */
rval = Tss2_Sys_GetCapability(this->sys_context, 0, TPM2_CAP_ECC_CURVES,
0, TPM2_PT_LOADED_CURVES, &more_data, &cap_data, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s GetCapability failed for TPM2_ECC_CURVES: 0x%06x",
LABEL, rval);
return FALSE;
}
/* reset print buffer */
pos = buf;
len = BUF_LEN;
/* print supported ECC curves */
for (i = 0; i < cap_data.data.eccCurves.count; i++)
{
written = snprintf(pos, len, " %N", tpm_ecc_curve_names,
cap_data.data.eccCurves.eccCurves[i]);
if (written < 0 || written >= len)
{
break;
}
pos += written;
len -= written;
}
DBG2(DBG_PTS, "%s ECC curves:%s", LABEL, buf);
return TRUE;
}
/**
* Initialize TSS2 TCTI context
*/
static bool initialize_tcti_context(private_tpm_tss_tss2_t *this)
{
size_t tcti_context_size;
uint32_t rval;
if (!tcti_init)
{
return FALSE;
}
/* determine size of tcti context */
rval = tcti_init(NULL, &tcti_context_size, tcti_opts);
if (rval != TSS2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s tcti init setup failed: 0x%06x", LABEL, rval);
return FALSE;
}
/* allocate and initialize memory for tcti context */
this->tcti_context = (TSS2_TCTI_CONTEXT*)malloc(tcti_context_size);
memset(this->tcti_context, 0x00, tcti_context_size);
/* initialize tcti context */
rval = tcti_init(this->tcti_context, &tcti_context_size, tcti_opts);
if (rval != TSS2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s tcti init allocation failed: 0x%06x", LABEL,rval);
return FALSE;
}
return TRUE;
}
/**
* Initialize TSS2 Sys context
*/
static bool initialize_sys_context(private_tpm_tss_tss2_t *this)
{
uint32_t sys_context_size;
uint32_t rval;
TSS2_ABI_VERSION abi_version = {
.tssCreator = 1,
.tssFamily = 2,
.tssLevel = 1,
.tssVersion = 108
};
/* determine size of sys context */
sys_context_size = Tss2_Sys_GetContextSize(0);
/* allocate memory for sys context */
this->sys_context = (TSS2_SYS_CONTEXT*)malloc(sys_context_size);
/* initialize sys context */
rval = Tss2_Sys_Initialize(this->sys_context, sys_context_size,
this->tcti_context, &abi_version);
if (rval != TSS2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s could not get sys_context: 0x%06x",
LABEL, rval);
return FALSE;
}
/* get a list of supported algorithms and ECC curves */
return get_algs_capability(this);
}
/**
* Finalize TSS context
*/
static void finalize_context(private_tpm_tss_tss2_t *this)
{
if (this->tcti_context)
{
Tss2_Tcti_Finalize(this->tcti_context);
free(this->tcti_context);
}
if (this->sys_context)
{
Tss2_Sys_Finalize(this->sys_context);
free(this->sys_context);
}
}
METHOD(tpm_tss_t, get_version, tpm_version_t,
private_tpm_tss_tss2_t *this)
{
return TPM_VERSION_2_0;
}
METHOD(tpm_tss_t, get_version_info, chunk_t,
private_tpm_tss_tss2_t *this)
{
return chunk_empty;
}
/**
* read the public key portion of a TSS 2.0 AIK key from NVRAM
*/
bool read_public(private_tpm_tss_tss2_t *this, TPMI_DH_OBJECT handle,
TPM2B_PUBLIC *public)
{
uint32_t rval;
TPM2B_NAME name = { sizeof(TPM2B_NAME)-2, };
TPM2B_NAME qualified_name = { sizeof(TPM2B_NAME)-2, };
TSS2L_SYS_AUTH_RESPONSE auth_rsp;
/* read public key for a given object handle from TPM 2.0 NVRAM */
rval = Tss2_Sys_ReadPublic(this->sys_context, handle, 0, public, &name,
&qualified_name, &auth_rsp);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s could not read public key from handle 0x%08x: 0x%06x",
LABEL, handle, rval);
return FALSE;
}
return TRUE;
}
METHOD(tpm_tss_t, generate_aik, bool,
private_tpm_tss_tss2_t *this, chunk_t ca_modulus, chunk_t *aik_blob,
chunk_t *aik_pubkey, chunk_t *identity_req)
{
return FALSE;
}
METHOD(tpm_tss_t, get_public, chunk_t,
private_tpm_tss_tss2_t *this, uint32_t handle)
{
TPM2B_PUBLIC public = { 0, };
TPM2_ALG_ID sig_alg, digest_alg;
chunk_t aik_blob, aik_pubkey = chunk_empty;
if (!read_public(this, handle, &public))
{
return chunk_empty;
}
aik_blob = chunk_create((u_char*)&public, sizeof(public));
DBG3(DBG_LIB, "%s AIK public key blob: %B", LABEL, &aik_blob);
/* convert TSS 2.0 AIK public key blot into PKCS#1 format */
switch (public.publicArea.type)
{
case TPM2_ALG_RSA:
{
TPM2B_PUBLIC_KEY_RSA *rsa;
TPMT_RSA_SCHEME *scheme;
chunk_t aik_exponent, aik_modulus;
scheme = &public.publicArea.parameters.rsaDetail.scheme;
sig_alg = scheme->scheme;
digest_alg = scheme->details.anySig.hashAlg;
rsa = &public.publicArea.unique.rsa;
aik_modulus = chunk_create(rsa->buffer, rsa->size);
aik_exponent = chunk_from_chars(0x01, 0x00, 0x01);
/* subjectPublicKeyInfo encoding of AIK RSA key */
if (!lib->encoding->encode(lib->encoding, PUBKEY_SPKI_ASN1_DER,
NULL, &aik_pubkey, CRED_PART_RSA_MODULUS, aik_modulus,
CRED_PART_RSA_PUB_EXP, aik_exponent, CRED_PART_END))
{
DBG1(DBG_PTS, "%s subjectPublicKeyInfo encoding of AIK key "
"failed", LABEL);
return chunk_empty;
}
break;
}
case TPM2_ALG_ECC:
{
TPMS_ECC_POINT *ecc;
TPMT_ECC_SCHEME *scheme;
chunk_t ecc_point;
uint8_t *pos;
scheme = &public.publicArea.parameters.eccDetail.scheme;
sig_alg = scheme->scheme;
digest_alg = scheme->details.anySig.hashAlg;
ecc = &public.publicArea.unique.ecc;
/* allocate space for bit string */
pos = asn1_build_object(&ecc_point, ASN1_BIT_STRING,
2 + ecc->x.size + ecc->y.size);
/* bit string length is a multiple of octets */
*pos++ = 0x00;
/* uncompressed ECC point format */
*pos++ = 0x04;
/* copy x coordinate of ECC point */
memcpy(pos, ecc->x.buffer, ecc->x.size);
pos += ecc->x.size;
/* copy y coordinate of ECC point */
memcpy(pos, ecc->y.buffer, ecc->y.size);
/* subjectPublicKeyInfo encoding of AIK ECC key */
aik_pubkey = asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_build_known_oid(OID_EC_PUBLICKEY),
asn1_build_known_oid(ecc->x.size == 32 ?
OID_PRIME256V1 : OID_SECT384R1)),
ecc_point);
break;
}
default:
DBG1(DBG_PTS, "%s unsupported AIK key type", LABEL);
return chunk_empty;
}
DBG1(DBG_PTS, "AIK signature algorithm is %N with %N hash",
tpm_alg_id_names, sig_alg, tpm_alg_id_names, digest_alg);
return aik_pubkey;
}
/**
* Configure a PCR Selection assuming a maximum of 24 registers
*/
static bool init_pcr_selection(private_tpm_tss_tss2_t *this, uint32_t pcrs,
hash_algorithm_t alg, TPML_PCR_SELECTION *pcr_sel)
{
TPM2_ALG_ID alg_id;
uint32_t pcr;
/* check if hash algorithm is supported by TPM */
alg_id = hash_alg_to_tpm_alg_id(alg);
if (!is_supported_alg(this, alg_id))
{
DBG1(DBG_PTS, "%s %N hash algorithm not supported by TPM",
LABEL, hash_algorithm_short_names, alg);
return FALSE;
}
/* initialize the PCR Selection structure,*/
pcr_sel->count = 1;
pcr_sel->pcrSelections[0].hash = alg_id;
pcr_sel->pcrSelections[0].sizeofSelect = 3;
pcr_sel->pcrSelections[0].pcrSelect[0] = 0;
pcr_sel->pcrSelections[0].pcrSelect[1] = 0;
pcr_sel->pcrSelections[0].pcrSelect[2] = 0;
/* set the selected PCRs */
for (pcr = 0; pcr < PLATFORM_PCR; pcr++)
{
if (pcrs & (1 << pcr))
{
pcr_sel->pcrSelections[0].pcrSelect[pcr / 8] |= ( 1 << (pcr % 8) );
}
}
return TRUE;
}
METHOD(tpm_tss_t, read_pcr, bool,
private_tpm_tss_tss2_t *this, uint32_t pcr_num, chunk_t *pcr_value,
hash_algorithm_t alg)
{
TPML_PCR_SELECTION pcr_selection;
TPML_DIGEST pcr_values;
uint32_t pcr_update_counter, rval;
uint8_t *pcr_value_ptr;
size_t pcr_value_len;
if (pcr_num >= PLATFORM_PCR)
{
DBG1(DBG_PTS, "%s maximum number of supported PCR is %d",
LABEL, PLATFORM_PCR);
return FALSE;
}
if (!init_pcr_selection(this, (1 << pcr_num), alg, &pcr_selection))
{
return FALSE;
}
/* initialize the PCR Digest structure */
memset(&pcr_values, 0, sizeof(TPML_DIGEST));
/* read the PCR value */
rval = Tss2_Sys_PCR_Read(this->sys_context, 0, &pcr_selection,
&pcr_update_counter, &pcr_selection, &pcr_values, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s PCR bank could not be read: 0x%60x",
LABEL, rval);
return FALSE;
}
pcr_value_ptr = (uint8_t *)pcr_values.digests[0].buffer;
pcr_value_len = (size_t) pcr_values.digests[0].size;
*pcr_value = chunk_clone(chunk_create(pcr_value_ptr, pcr_value_len));
return TRUE;
}
METHOD(tpm_tss_t, extend_pcr, bool,
private_tpm_tss_tss2_t *this, uint32_t pcr_num, chunk_t *pcr_value,
chunk_t data, hash_algorithm_t alg)
{
uint32_t rval;
TPM2_ALG_ID alg_id;
TPML_DIGEST_VALUES digest_values;
TSS2L_SYS_AUTH_COMMAND auth_cmd = { 1, { auth_cmd_empty } };
TSS2L_SYS_AUTH_RESPONSE auth_rsp;
auth_cmd.auths[0].sessionHandle = TPM2_RS_PW;
/* check if hash algorithm is supported by TPM */
alg_id = hash_alg_to_tpm_alg_id(alg);
if (!is_supported_alg(this, alg_id))
{
DBG1(DBG_PTS, "%s %N hash algorithm not supported by TPM",
LABEL, hash_algorithm_short_names, alg);
return FALSE;
}
digest_values.count = 1;
digest_values.digests[0].hashAlg = alg_id;
switch (alg)
{
case HASH_SHA1:
if (data.len != HASH_SIZE_SHA1)
{
return FALSE;
}
memcpy(digest_values.digests[0].digest.sha1, data.ptr,
HASH_SIZE_SHA1);
break;
case HASH_SHA256:
if (data.len != HASH_SIZE_SHA256)
{
return FALSE;
}
memcpy(digest_values.digests[0].digest.sha256, data.ptr,
HASH_SIZE_SHA256);
break;
case HASH_SHA384:
if (data.len != HASH_SIZE_SHA384)
{
return FALSE;
}
memcpy(digest_values.digests[0].digest.sha384, data.ptr,
HASH_SIZE_SHA384);
break;
case HASH_SHA512:
if (data.len != HASH_SIZE_SHA512)
{
return FALSE;
}
memcpy(digest_values.digests[0].digest.sha512, data.ptr,
HASH_SIZE_SHA512);
break;
default:
return FALSE;
}
/* extend PCR */
rval = Tss2_Sys_PCR_Extend(this->sys_context, pcr_num, &auth_cmd,
&digest_values, &auth_rsp);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS, "%s PCR %02u could not be extended: 0x%06x",
LABEL, pcr_num, rval);
return FALSE;
}
/* get updated PCR value */
return read_pcr(this, pcr_num, pcr_value, alg);
}
METHOD(tpm_tss_t, quote, bool,
private_tpm_tss_tss2_t *this, uint32_t aik_handle, uint32_t pcr_sel,
hash_algorithm_t alg, chunk_t data, tpm_quote_mode_t *quote_mode,
tpm_tss_quote_info_t **quote_info, chunk_t *quote_sig)
{
chunk_t quoted_chunk, qualified_signer, extra_data, clock_info,
firmware_version, pcr_select, pcr_digest;
hash_algorithm_t pcr_digest_alg;
bio_reader_t *reader;
uint32_t rval;
TPM2B_DATA qualifying_data;
TPML_PCR_SELECTION pcr_selection;
TPM2B_ATTEST quoted = { sizeof(TPM2B_ATTEST)-2, };
TPMT_SIG_SCHEME scheme;
TPMT_SIGNATURE sig;
TPMI_ALG_HASH hash_alg;
TSS2L_SYS_AUTH_COMMAND auth_cmd = { 1, { auth_cmd_empty } };
TSS2L_SYS_AUTH_RESPONSE auth_rsp;
auth_cmd.auths[0].sessionHandle = TPM2_RS_PW;
qualifying_data.size = data.len;
memcpy(qualifying_data.buffer, data.ptr, data.len);
scheme.scheme = TPM2_ALG_NULL;
memset(&sig, 0x00, sizeof(sig));
/* set Quote mode */
*quote_mode = TPM_QUOTE_TPM2;
if (!init_pcr_selection(this, pcr_sel, alg, &pcr_selection))
{
return FALSE;
}
rval = Tss2_Sys_Quote(this->sys_context, aik_handle, &auth_cmd,
&qualifying_data, &scheme, &pcr_selection, &quoted,
&sig, &auth_rsp);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_Quote failed: 0x%06x", LABEL, rval);
return FALSE;
}
quoted_chunk = chunk_create(quoted.attestationData, quoted.size);
reader = bio_reader_create(chunk_skip(quoted_chunk, 6));
if (!reader->read_data16(reader, &qualified_signer) ||
!reader->read_data16(reader, &extra_data) ||
!reader->read_data (reader, 17, &clock_info) ||
!reader->read_data (reader, 8, &firmware_version) ||
!reader->read_data (reader, 10, &pcr_select) ||
!reader->read_data16(reader, &pcr_digest))
{
DBG1(DBG_PTS, "%s parsing of quoted struct failed", LABEL);
reader->destroy(reader);
return FALSE;
}
reader->destroy(reader);
DBG2(DBG_PTS, "PCR Composite digest: %B", &pcr_digest);
DBG2(DBG_PTS, "TPM Quote Info: %B", &quoted_chunk);
DBG2(DBG_PTS, "qualifiedSigner: %B", &qualified_signer);
DBG2(DBG_PTS, "extraData: %B", &extra_data);
DBG2(DBG_PTS, "clockInfo: %B", &clock_info);
DBG2(DBG_PTS, "firmwareVersion: %B", &firmware_version);
DBG2(DBG_PTS, "pcrSelect: %B", &pcr_select);
/* extract signature */
switch (sig.sigAlg)
{
case TPM2_ALG_RSASSA:
case TPM2_ALG_RSAPSS:
*quote_sig = chunk_clone(
chunk_create(
sig.signature.rsassa.sig.buffer,
sig.signature.rsassa.sig.size));
hash_alg = sig.signature.rsassa.hash;
break;
case TPM2_ALG_ECDSA:
case TPM2_ALG_ECDAA:
case TPM2_ALG_SM2:
case TPM2_ALG_ECSCHNORR:
*quote_sig = chunk_cat("cc",
chunk_create(
sig.signature.ecdsa.signatureR.buffer,
sig.signature.ecdsa.signatureR.size),
chunk_create(
sig.signature.ecdsa.signatureS.buffer,
sig.signature.ecdsa.signatureS.size));
hash_alg = sig.signature.ecdsa.hash;
break;
default:
DBG1(DBG_PTS, "%s unsupported %N signature algorithm",
LABEL, tpm_alg_id_names, sig.sigAlg);
return FALSE;
};
DBG2(DBG_PTS, "PCR digest algorithm is %N", tpm_alg_id_names, hash_alg);
pcr_digest_alg = hash_alg_from_tpm_alg_id(hash_alg);
DBG2(DBG_PTS, "TPM Quote Signature: %B", quote_sig);
/* Create and initialize Quote Info object */
*quote_info = tpm_tss_quote_info_create(*quote_mode, pcr_digest_alg,
pcr_digest);
(*quote_info)->set_tpm2_info(*quote_info, qualified_signer, clock_info,
pcr_select);
(*quote_info)->set_version_info(*quote_info, firmware_version);
return TRUE;
}
METHOD(tpm_tss_t, sign, bool,
private_tpm_tss_tss2_t *this, uint32_t hierarchy, uint32_t handle,
signature_scheme_t scheme, void *params, chunk_t data, chunk_t pin,
chunk_t *signature)
{
key_type_t key_type;
hash_algorithm_t hash_alg;
rsa_pss_params_t *rsa_pss_params;
uint32_t rval;
TPM2_ALG_ID alg_id;
TPM2B_MAX_BUFFER buffer;
TPM2B_DIGEST hash = { sizeof(TPM2B_DIGEST)-2, };
TPMT_TK_HASHCHECK validation;
TPM2B_PUBLIC public = { 0, };
TPMT_SIG_SCHEME sig_scheme;
TPMT_SIGNATURE sig;
TPMS_AUTH_COMMAND *cmd;
TSS2L_SYS_AUTH_COMMAND auth_cmd = { 1, { auth_cmd_empty } };
TSS2L_SYS_AUTH_RESPONSE auth_rsp;
cmd = &auth_cmd.auths[0];
cmd->sessionHandle = TPM2_RS_PW;
if (pin.len > 0)
{
cmd->hmac.size = min(sizeof(cmd->hmac)-2, pin.len);
memcpy(cmd->hmac.buffer, pin.ptr, cmd->hmac.size);
}
if (scheme == SIGN_RSA_EMSA_PSS)
{
key_type = KEY_RSA;
rsa_pss_params = (rsa_pss_params_t *)params;
hash_alg = rsa_pss_params->hash;
}
else
{
key_type = key_type_from_signature_scheme(scheme);
hash_alg = hasher_from_signature_scheme(scheme, NULL);
}
/* Check if hash algorithm is supported by TPM */
alg_id = hash_alg_to_tpm_alg_id(hash_alg);
if (!is_supported_alg(this, alg_id))
{
DBG1(DBG_PTS, "%s %N hash algorithm not supported by TPM",
LABEL, hash_algorithm_short_names, hash_alg);
return FALSE;
}
/* Get public key */
if (!read_public(this, handle, &public))
{
return FALSE;
}
if (key_type == KEY_RSA && public.publicArea.type == TPM2_ALG_RSA)
{
if (scheme == SIGN_RSA_EMSA_PSS)
{
sig_scheme.scheme = TPM2_ALG_RSAPSS;
sig_scheme.details.rsapss.hashAlg = alg_id;
}
else
{
sig_scheme.scheme = TPM2_ALG_RSASSA;
sig_scheme.details.rsassa.hashAlg = alg_id;
}
}
else if (key_type == KEY_ECDSA && public.publicArea.type == TPM2_ALG_ECC)
{
sig_scheme.scheme = TPM2_ALG_ECDSA;
sig_scheme.details.ecdsa.hashAlg = alg_id;
}
else
{
DBG1(DBG_PTS, "%s signature scheme %N not supported by TPM key",
LABEL, signature_scheme_names, scheme);
return FALSE;
}
if (data.len <= TPM2_MAX_DIGEST_BUFFER)
{
memcpy(buffer.buffer, data.ptr, data.len);
buffer.size = data.len;
rval = Tss2_Sys_Hash(this->sys_context, 0, &buffer, alg_id, hierarchy,
&hash, &validation, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_Hash failed: 0x%06x", LABEL, rval);
return FALSE;
}
}
else
{
TPMI_DH_OBJECT sequence_handle;
TPM2B_AUTH null_auth;
null_auth.size = 0;
rval = Tss2_Sys_HashSequenceStart(this->sys_context, 0, &null_auth,
alg_id, &sequence_handle, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_HashSequenceStart failed: 0x%06x",
LABEL, rval);
return FALSE;
}
while (data.len > 0)
{
buffer.size = min(data.len, TPM2_MAX_DIGEST_BUFFER);
memcpy(buffer.buffer, data.ptr, buffer.size);
data.ptr += buffer.size;
data.len -= buffer.size;
rval = Tss2_Sys_SequenceUpdate(this->sys_context, sequence_handle,
&auth_cmd, &buffer, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_SequenceUpdate failed: 0x%06x",
LABEL, rval);
return FALSE;
}
}
buffer.size = 0;
rval = Tss2_Sys_SequenceComplete(this->sys_context, sequence_handle,
&auth_cmd, &buffer, hierarchy,
&hash, &validation, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_SequenceComplete failed: 0x%06x",
LABEL, rval);
return FALSE;
}
}
rval = Tss2_Sys_Sign(this->sys_context, handle, &auth_cmd, &hash,
&sig_scheme, &validation, &sig, &auth_rsp);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_Sign failed: 0x%06x", LABEL, rval);
return FALSE;
}
/* extract signature */
switch (scheme)
{
case SIGN_RSA_EMSA_PKCS1_SHA1:
case SIGN_RSA_EMSA_PKCS1_SHA2_256:
case SIGN_RSA_EMSA_PKCS1_SHA2_384:
case SIGN_RSA_EMSA_PKCS1_SHA2_512:
*signature = chunk_clone(
chunk_create(
sig.signature.rsassa.sig.buffer,
sig.signature.rsassa.sig.size));
break;
case SIGN_RSA_EMSA_PSS:
*signature = chunk_clone(
chunk_create(
sig.signature.rsapss.sig.buffer,
sig.signature.rsapss.sig.size));
break;
case SIGN_ECDSA_256:
case SIGN_ECDSA_384:
case SIGN_ECDSA_521:
*signature = chunk_cat("cc",
chunk_create(
sig.signature.ecdsa.signatureR.buffer,
sig.signature.ecdsa.signatureR.size),
chunk_create(
sig.signature.ecdsa.signatureS.buffer,
sig.signature.ecdsa.signatureS.size));
break;
case SIGN_ECDSA_WITH_SHA256_DER:
case SIGN_ECDSA_WITH_SHA384_DER:
case SIGN_ECDSA_WITH_SHA512_DER:
*signature = asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_integer("c",
chunk_create(
sig.signature.ecdsa.signatureR.buffer,
sig.signature.ecdsa.signatureR.size)),
asn1_integer("c",
chunk_create(
sig.signature.ecdsa.signatureS.buffer,
sig.signature.ecdsa.signatureS.size)));
break;
default:
DBG1(DBG_PTS, "%s unsupported %N signature scheme",
LABEL, signature_scheme_names, scheme);
return FALSE;
};
return TRUE;
}
METHOD(tpm_tss_t, get_random, bool,
private_tpm_tss_tss2_t *this, size_t bytes, uint8_t *buffer)
{
size_t len, random_len= sizeof(TPM2B_DIGEST)-2;
TPM2B_DIGEST random = { random_len, };
uint8_t *pos = buffer;
uint32_t rval;
while (bytes > 0)
{
len = min(bytes, random_len);
rval = Tss2_Sys_GetRandom(this->sys_context, NULL, len, &random, NULL);
if (rval != TSS2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_GetRandom failed: 0x%06x", LABEL, rval);
return FALSE;
}
memcpy(pos, random.buffer, random.size);
pos += random.size;
bytes -= random.size;
}
return TRUE;
}
METHOD(tpm_tss_t, get_data, bool,
private_tpm_tss_tss2_t *this, uint32_t hierarchy, uint32_t handle,
chunk_t pin, chunk_t *data)
{
uint16_t max_data_size, nv_size, nv_offset = 0;
uint32_t rval;
TPMS_CAPABILITY_DATA cap_data;
TPMI_YES_NO more_data;
TPM2B_NAME nv_name = { sizeof(TPM2B_NAME)-2, };
TPM2B_NV_PUBLIC nv_public = { 0, };
TPM2B_MAX_NV_BUFFER nv_data = { TPM2_MAX_NV_BUFFER_SIZE, };
TPMS_AUTH_COMMAND *cmd;
TSS2L_SYS_AUTH_COMMAND auth_cmd = { 1, { auth_cmd_empty } };
TSS2L_SYS_AUTH_RESPONSE auth_rsp;
/* query maximum TPM data transmission size */
rval = Tss2_Sys_GetCapability(this->sys_context, 0, TPM2_CAP_TPM_PROPERTIES,
TPM2_PT_NV_BUFFER_MAX, 1, &more_data, &cap_data, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_GetCapability failed for "
"TPM2_CAP_TPM_PROPERTIES: 0x%06x", LABEL, rval);
return FALSE;
}
max_data_size = min(cap_data.data.tpmProperties.tpmProperty[0].value,
TPM2_MAX_NV_BUFFER_SIZE);
/* get size of NV object */
rval = Tss2_Sys_NV_ReadPublic(this->sys_context, handle, 0, &nv_public,
&nv_name, 0);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_NV_ReadPublic failed: 0x%06x", LABEL, rval);
return FALSE;
}
nv_size = nv_public.nvPublic.dataSize;
*data = chunk_alloc(nv_size);
/* prepare NV read session */
cmd = &auth_cmd.auths[0];
cmd->sessionHandle = TPM2_RS_PW;
if (pin.len > 0)
{
cmd->hmac.size = min(sizeof(cmd->hmac)-2, pin.len);
memcpy(cmd->hmac.buffer, pin.ptr, cmd->hmac.size);
}
/* read NV data a maximum data size block at a time */
while (nv_size > 0)
{
rval = Tss2_Sys_NV_Read(this->sys_context, hierarchy, handle, &auth_cmd,
min(nv_size, max_data_size), nv_offset, &nv_data, &auth_rsp);
if (rval != TPM2_RC_SUCCESS)
{
DBG1(DBG_PTS,"%s Tss2_Sys_NV_Read failed: 0x%06x", LABEL, rval);
chunk_free(data);
return FALSE;
}
memcpy(data->ptr + nv_offset, nv_data.buffer, nv_data.size);
nv_offset += nv_data.size;
nv_size -= nv_data.size;
}
return TRUE;
}
METHOD(tpm_tss_t, destroy, void,
private_tpm_tss_tss2_t *this)
{
finalize_context(this);
free(this);
}
/**
* See header
*/
tpm_tss_t *tpm_tss_tss2_create()
{
private_tpm_tss_tss2_t *this;
bool available;
INIT(this,
.public = {
.get_version = _get_version,
.get_version_info = _get_version_info,
.generate_aik = _generate_aik,
.get_public = _get_public,
.read_pcr = _read_pcr,
.extend_pcr = _extend_pcr,
.quote = _quote,
.sign = _sign,
.get_random = _get_random,
.get_data = _get_data,
.destroy = _destroy,
},
);
available = initialize_tcti_context(this);
if (available)
{
available = initialize_sys_context(this);
}
DBG1(DBG_PTS, "TPM 2.0 via TSS2 v2 %savailable", available ? "" : "not ");
if (!available)
{
destroy(this);
return NULL;
}
return &this->public;
}
/**
* See header
*/
bool tpm_tss_tss2_init(void)
{
TSS2_TCTI_INFO_FUNC infofn;
const TSS2_TCTI_INFO *info;
char tcti_lib_format[] = "libtss2-tcti-%s.so.0";
char tcti_lib[BUF_LEN];
char *tcti_names[] = { "device", "tabrmd", "mssim" };
char *tcti_options[] = { "/dev/tpmrm0", "", "" };
char *tcti_name;
bool match = FALSE;
struct stat st;
int i = 0;
/* check for the existence of an in-kernel TPM resource manager */
if (stat(tcti_options[i], &st))
{
i = 1;
}
DBG2(DBG_PTS, "%s \"%s\" in-kernel resource manager is %spresent",
LABEL, tcti_options[0], i ? "not " : "");
/* select a dynamic TCTI library (device, tabrmd or mssim) */
tcti_name = lib->settings->get_str(lib->settings,
"%s.plugins.tpm.tcti.name", tcti_names[i], lib->ns);
snprintf(tcti_lib, BUF_LEN, tcti_lib_format, tcti_name);
for (i = 0; i < countof(tcti_names); i++)
{
if (streq(tcti_name, tcti_names[i]))
{
match = TRUE;
break;
}
}
if (!match)
{
DBG1(DBG_PTS, "%s \"%s\" is not a valid TCTI library name",
LABEL, tcti_lib);
return FALSE;
}
tcti_opts = lib->settings->get_str(lib->settings,
"%s.plugins.tpm.tcti.opts", tcti_options[i], lib->ns);
/* open the selected dynamic TCTI library */
tcti_handle = dlopen(tcti_lib, RTLD_LAZY);
if (!tcti_handle)
{
DBG1(DBG_PTS, "%s could not load \"%s\"", LABEL, tcti_lib);
return FALSE;
}
infofn = (TSS2_TCTI_INFO_FUNC)dlsym(tcti_handle, TSS2_TCTI_INFO_SYMBOL);
if (!infofn)
{
DBG1(DBG_PTS, "%s symbol \"%s\" not found in \"%s\"", LABEL,
TSS2_TCTI_INFO_SYMBOL, tcti_lib);
tpm_tss_tss2_deinit();
return FALSE;
}
DBG2(DBG_PTS, "%s \"%s\" successfully loaded", LABEL, tcti_lib);
info = infofn();
tcti_init = info->init;
return TRUE;
}
/**
* See header
*/
void tpm_tss_tss2_deinit(void)
{
dlclose(tcti_handle);
tcti_handle = NULL;
tcti_init = NULL;
tcti_opts = NULL;
}
#else /* TSS_TSS2_V2 */
/**
* See header
*/
bool tpm_tss_tss2_init(void)
{
return TRUE;
}
/**
* See header
*/
void tpm_tss_tss2_deinit(void)
{
/* empty */
}
#endif /* TSS_TSS2_V2 */
View Git Blame Copy Permalink