647 строки
17 KiB
C
647 строки
17 KiB
C
/*
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* Copyright (C) 2014 Intel Corporation
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*
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* Authors:
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* Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* This file contains TPM2 protocol implementations of the commands
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* used by the kernel internally.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#include "tpm.h"
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struct tpm2_startup_in {
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__be16 startup_type;
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} __packed;
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struct tpm2_self_test_in {
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u8 full_test;
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} __packed;
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struct tpm2_pcr_read_in {
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__be32 pcr_selects_cnt;
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__be16 hash_alg;
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u8 pcr_select_size;
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u8 pcr_select[TPM2_PCR_SELECT_MIN];
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} __packed;
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struct tpm2_pcr_read_out {
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__be32 update_cnt;
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__be32 pcr_selects_cnt;
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__be16 hash_alg;
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u8 pcr_select_size;
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u8 pcr_select[TPM2_PCR_SELECT_MIN];
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__be32 digests_cnt;
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__be16 digest_size;
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u8 digest[TPM_DIGEST_SIZE];
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} __packed;
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struct tpm2_null_auth_area {
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__be32 handle;
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__be16 nonce_size;
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u8 attributes;
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__be16 auth_size;
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} __packed;
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struct tpm2_pcr_extend_in {
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__be32 pcr_idx;
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__be32 auth_area_size;
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struct tpm2_null_auth_area auth_area;
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__be32 digest_cnt;
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__be16 hash_alg;
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u8 digest[TPM_DIGEST_SIZE];
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} __packed;
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struct tpm2_get_tpm_pt_in {
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__be32 cap_id;
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__be32 property_id;
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__be32 property_cnt;
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} __packed;
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struct tpm2_get_tpm_pt_out {
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u8 more_data;
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__be32 subcap_id;
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__be32 property_cnt;
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__be32 property_id;
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__be32 value;
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} __packed;
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struct tpm2_get_random_in {
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__be16 size;
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} __packed;
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struct tpm2_get_random_out {
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__be16 size;
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u8 buffer[TPM_MAX_RNG_DATA];
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} __packed;
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union tpm2_cmd_params {
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struct tpm2_startup_in startup_in;
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struct tpm2_self_test_in selftest_in;
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struct tpm2_pcr_read_in pcrread_in;
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struct tpm2_pcr_read_out pcrread_out;
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struct tpm2_pcr_extend_in pcrextend_in;
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struct tpm2_get_tpm_pt_in get_tpm_pt_in;
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struct tpm2_get_tpm_pt_out get_tpm_pt_out;
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struct tpm2_get_random_in getrandom_in;
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struct tpm2_get_random_out getrandom_out;
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};
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struct tpm2_cmd {
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tpm_cmd_header header;
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union tpm2_cmd_params params;
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} __packed;
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/*
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* Array with one entry per ordinal defining the maximum amount
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* of time the chip could take to return the result. The values
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* of the SHORT, MEDIUM, and LONG durations are taken from the
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* PC Client Profile (PTP) specification.
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*/
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static const u8 tpm2_ordinal_duration[TPM2_CC_LAST - TPM2_CC_FIRST + 1] = {
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TPM_UNDEFINED, /* 11F */
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TPM_UNDEFINED, /* 120 */
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TPM_LONG, /* 121 */
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TPM_UNDEFINED, /* 122 */
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TPM_UNDEFINED, /* 123 */
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TPM_UNDEFINED, /* 124 */
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TPM_UNDEFINED, /* 125 */
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TPM_UNDEFINED, /* 126 */
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TPM_UNDEFINED, /* 127 */
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TPM_UNDEFINED, /* 128 */
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TPM_LONG, /* 129 */
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TPM_UNDEFINED, /* 12a */
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TPM_UNDEFINED, /* 12b */
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TPM_UNDEFINED, /* 12c */
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TPM_UNDEFINED, /* 12d */
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TPM_UNDEFINED, /* 12e */
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TPM_UNDEFINED, /* 12f */
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TPM_UNDEFINED, /* 130 */
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TPM_UNDEFINED, /* 131 */
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TPM_UNDEFINED, /* 132 */
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TPM_UNDEFINED, /* 133 */
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TPM_UNDEFINED, /* 134 */
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TPM_UNDEFINED, /* 135 */
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TPM_UNDEFINED, /* 136 */
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TPM_UNDEFINED, /* 137 */
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TPM_UNDEFINED, /* 138 */
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TPM_UNDEFINED, /* 139 */
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TPM_UNDEFINED, /* 13a */
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TPM_UNDEFINED, /* 13b */
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TPM_UNDEFINED, /* 13c */
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TPM_UNDEFINED, /* 13d */
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TPM_MEDIUM, /* 13e */
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TPM_UNDEFINED, /* 13f */
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TPM_UNDEFINED, /* 140 */
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TPM_UNDEFINED, /* 141 */
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TPM_UNDEFINED, /* 142 */
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TPM_LONG, /* 143 */
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TPM_MEDIUM, /* 144 */
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TPM_UNDEFINED, /* 145 */
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TPM_UNDEFINED, /* 146 */
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TPM_UNDEFINED, /* 147 */
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TPM_UNDEFINED, /* 148 */
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TPM_UNDEFINED, /* 149 */
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TPM_UNDEFINED, /* 14a */
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TPM_UNDEFINED, /* 14b */
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TPM_UNDEFINED, /* 14c */
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TPM_UNDEFINED, /* 14d */
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TPM_LONG, /* 14e */
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TPM_UNDEFINED, /* 14f */
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TPM_UNDEFINED, /* 150 */
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TPM_UNDEFINED, /* 151 */
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TPM_UNDEFINED, /* 152 */
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TPM_UNDEFINED, /* 153 */
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TPM_UNDEFINED, /* 154 */
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TPM_UNDEFINED, /* 155 */
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TPM_UNDEFINED, /* 156 */
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TPM_UNDEFINED, /* 157 */
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TPM_UNDEFINED, /* 158 */
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TPM_UNDEFINED, /* 159 */
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TPM_UNDEFINED, /* 15a */
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TPM_UNDEFINED, /* 15b */
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TPM_MEDIUM, /* 15c */
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TPM_UNDEFINED, /* 15d */
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TPM_UNDEFINED, /* 15e */
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TPM_UNDEFINED, /* 15f */
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TPM_UNDEFINED, /* 160 */
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TPM_UNDEFINED, /* 161 */
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TPM_UNDEFINED, /* 162 */
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TPM_UNDEFINED, /* 163 */
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TPM_UNDEFINED, /* 164 */
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TPM_UNDEFINED, /* 165 */
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TPM_UNDEFINED, /* 166 */
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TPM_UNDEFINED, /* 167 */
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TPM_UNDEFINED, /* 168 */
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TPM_UNDEFINED, /* 169 */
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TPM_UNDEFINED, /* 16a */
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TPM_UNDEFINED, /* 16b */
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TPM_UNDEFINED, /* 16c */
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TPM_UNDEFINED, /* 16d */
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TPM_UNDEFINED, /* 16e */
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TPM_UNDEFINED, /* 16f */
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TPM_UNDEFINED, /* 170 */
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TPM_UNDEFINED, /* 171 */
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TPM_UNDEFINED, /* 172 */
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TPM_UNDEFINED, /* 173 */
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TPM_UNDEFINED, /* 174 */
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TPM_UNDEFINED, /* 175 */
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TPM_UNDEFINED, /* 176 */
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TPM_LONG, /* 177 */
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TPM_UNDEFINED, /* 178 */
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TPM_UNDEFINED, /* 179 */
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TPM_MEDIUM, /* 17a */
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TPM_LONG, /* 17b */
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TPM_UNDEFINED, /* 17c */
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TPM_UNDEFINED, /* 17d */
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TPM_UNDEFINED, /* 17e */
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TPM_UNDEFINED, /* 17f */
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TPM_UNDEFINED, /* 180 */
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TPM_UNDEFINED, /* 181 */
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TPM_MEDIUM, /* 182 */
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TPM_UNDEFINED, /* 183 */
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TPM_UNDEFINED, /* 184 */
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TPM_MEDIUM, /* 185 */
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TPM_MEDIUM, /* 186 */
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TPM_UNDEFINED, /* 187 */
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TPM_UNDEFINED, /* 188 */
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TPM_UNDEFINED, /* 189 */
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TPM_UNDEFINED, /* 18a */
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TPM_UNDEFINED, /* 18b */
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TPM_UNDEFINED, /* 18c */
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TPM_UNDEFINED, /* 18d */
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TPM_UNDEFINED, /* 18e */
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TPM_UNDEFINED /* 18f */
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};
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#define TPM2_PCR_READ_IN_SIZE \
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(sizeof(struct tpm_input_header) + \
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sizeof(struct tpm2_pcr_read_in))
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static const struct tpm_input_header tpm2_pcrread_header = {
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.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
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.length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE),
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.ordinal = cpu_to_be32(TPM2_CC_PCR_READ)
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};
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/**
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* tpm2_pcr_read() - read a PCR value
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* @chip: TPM chip to use.
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* @pcr_idx: index of the PCR to read.
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* @ref_buf: buffer to store the resulting hash,
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*
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* 0 is returned when the operation is successful. If a negative number is
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* returned it remarks a POSIX error code. If a positive number is returned
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* it remarks a TPM error.
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*/
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int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
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{
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int rc;
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struct tpm2_cmd cmd;
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u8 *buf;
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if (pcr_idx >= TPM2_PLATFORM_PCR)
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return -EINVAL;
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cmd.header.in = tpm2_pcrread_header;
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cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
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cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
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cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
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memset(cmd.params.pcrread_in.pcr_select, 0,
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sizeof(cmd.params.pcrread_in.pcr_select));
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cmd.params.pcrread_in.pcr_select[pcr_idx >> 3] = 1 << (pcr_idx & 0x7);
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rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
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"attempting to read a pcr value");
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if (rc == 0) {
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buf = cmd.params.pcrread_out.digest;
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memcpy(res_buf, buf, TPM_DIGEST_SIZE);
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}
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return rc;
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}
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#define TPM2_GET_PCREXTEND_IN_SIZE \
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(sizeof(struct tpm_input_header) + \
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sizeof(struct tpm2_pcr_extend_in))
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static const struct tpm_input_header tpm2_pcrextend_header = {
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.tag = cpu_to_be16(TPM2_ST_SESSIONS),
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.length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
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.ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
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};
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/**
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* tpm2_pcr_extend() - extend a PCR value
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* @chip: TPM chip to use.
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* @pcr_idx: index of the PCR.
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* @hash: hash value to use for the extend operation.
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*
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* 0 is returned when the operation is successful. If a negative number is
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* returned it remarks a POSIX error code. If a positive number is returned
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* it remarks a TPM error.
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*/
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int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
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{
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struct tpm2_cmd cmd;
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int rc;
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cmd.header.in = tpm2_pcrextend_header;
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cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
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cmd.params.pcrextend_in.auth_area_size =
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cpu_to_be32(sizeof(struct tpm2_null_auth_area));
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cmd.params.pcrextend_in.auth_area.handle =
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cpu_to_be32(TPM2_RS_PW);
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cmd.params.pcrextend_in.auth_area.nonce_size = 0;
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cmd.params.pcrextend_in.auth_area.attributes = 0;
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cmd.params.pcrextend_in.auth_area.auth_size = 0;
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cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
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cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
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memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
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rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
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"attempting extend a PCR value");
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return rc;
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}
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#define TPM2_GETRANDOM_IN_SIZE \
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(sizeof(struct tpm_input_header) + \
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sizeof(struct tpm2_get_random_in))
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static const struct tpm_input_header tpm2_getrandom_header = {
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.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
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.length = cpu_to_be32(TPM2_GETRANDOM_IN_SIZE),
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.ordinal = cpu_to_be32(TPM2_CC_GET_RANDOM)
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};
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/**
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* tpm2_get_random() - get random bytes from the TPM RNG
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* @chip: TPM chip to use
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* @out: destination buffer for the random bytes
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* @max: the max number of bytes to write to @out
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*
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* 0 is returned when the operation is successful. If a negative number is
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* returned it remarks a POSIX error code. If a positive number is returned
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* it remarks a TPM error.
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*/
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int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max)
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{
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struct tpm2_cmd cmd;
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u32 recd;
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u32 num_bytes;
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int err;
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int total = 0;
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int retries = 5;
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u8 *dest = out;
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num_bytes = min_t(u32, max, sizeof(cmd.params.getrandom_out.buffer));
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if (!out || !num_bytes ||
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max > sizeof(cmd.params.getrandom_out.buffer))
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return -EINVAL;
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do {
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cmd.header.in = tpm2_getrandom_header;
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cmd.params.getrandom_in.size = cpu_to_be16(num_bytes);
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err = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
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"attempting get random");
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if (err)
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break;
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recd = min_t(u32, be16_to_cpu(cmd.params.getrandom_out.size),
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num_bytes);
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memcpy(dest, cmd.params.getrandom_out.buffer, recd);
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dest += recd;
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total += recd;
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num_bytes -= recd;
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} while (retries-- && total < max);
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return total ? total : -EIO;
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}
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#define TPM2_GET_TPM_PT_IN_SIZE \
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(sizeof(struct tpm_input_header) + \
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sizeof(struct tpm2_get_tpm_pt_in))
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static const struct tpm_input_header tpm2_get_tpm_pt_header = {
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.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
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.length = cpu_to_be32(TPM2_GET_TPM_PT_IN_SIZE),
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.ordinal = cpu_to_be32(TPM2_CC_GET_CAPABILITY)
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};
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/**
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* tpm2_get_tpm_pt() - get value of a TPM_CAP_TPM_PROPERTIES type property
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* @chip: TPM chip to use.
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* @property_id: property ID.
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* @value: output variable.
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* @desc: passed to tpm_transmit_cmd()
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*
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* 0 is returned when the operation is successful. If a negative number is
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* returned it remarks a POSIX error code. If a positive number is returned
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* it remarks a TPM error.
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*/
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ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id, u32 *value,
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const char *desc)
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{
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struct tpm2_cmd cmd;
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int rc;
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cmd.header.in = tpm2_get_tpm_pt_header;
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cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
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cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(property_id);
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cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
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rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), desc);
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if (!rc)
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*value = cmd.params.get_tpm_pt_out.value;
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return rc;
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}
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#define TPM2_STARTUP_IN_SIZE \
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(sizeof(struct tpm_input_header) + \
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sizeof(struct tpm2_startup_in))
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static const struct tpm_input_header tpm2_startup_header = {
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.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
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.length = cpu_to_be32(TPM2_STARTUP_IN_SIZE),
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.ordinal = cpu_to_be32(TPM2_CC_STARTUP)
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};
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/**
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* tpm2_startup() - send startup command to the TPM chip
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* @chip: TPM chip to use.
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* @startup_type startup type. The value is either
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* TPM_SU_CLEAR or TPM_SU_STATE.
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*
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* 0 is returned when the operation is successful. If a negative number is
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* returned it remarks a POSIX error code. If a positive number is returned
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* it remarks a TPM error.
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*/
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int tpm2_startup(struct tpm_chip *chip, u16 startup_type)
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{
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struct tpm2_cmd cmd;
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cmd.header.in = tpm2_startup_header;
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cmd.params.startup_in.startup_type = cpu_to_be16(startup_type);
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return tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
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"attempting to start the TPM");
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}
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EXPORT_SYMBOL_GPL(tpm2_startup);
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#define TPM2_SHUTDOWN_IN_SIZE \
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(sizeof(struct tpm_input_header) + \
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sizeof(struct tpm2_startup_in))
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static const struct tpm_input_header tpm2_shutdown_header = {
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.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
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.length = cpu_to_be32(TPM2_SHUTDOWN_IN_SIZE),
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.ordinal = cpu_to_be32(TPM2_CC_SHUTDOWN)
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};
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/**
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* tpm2_shutdown() - send shutdown command to the TPM chip
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* @chip: TPM chip to use.
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* @shutdown_type shutdown type. The value is either
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* TPM_SU_CLEAR or TPM_SU_STATE.
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*/
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void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type)
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{
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struct tpm2_cmd cmd;
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int rc;
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cmd.header.in = tpm2_shutdown_header;
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cmd.params.startup_in.startup_type = cpu_to_be16(shutdown_type);
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rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), "stopping the TPM");
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/* In places where shutdown command is sent there's no much we can do
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* except print the error code on a system failure.
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*/
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if (rc < 0)
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dev_warn(chip->pdev, "transmit returned %d while stopping the TPM",
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rc);
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}
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EXPORT_SYMBOL_GPL(tpm2_shutdown);
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/*
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* tpm2_calc_ordinal_duration() - maximum duration for a command
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* @chip: TPM chip to use.
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* @ordinal: command code number.
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*
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* 0 is returned when the operation is successful. If a negative number is
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* returned it remarks a POSIX error code. If a positive number is returned
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* it remarks a TPM error.
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*/
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unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
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{
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int index = TPM_UNDEFINED;
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int duration = 0;
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if (ordinal >= TPM2_CC_FIRST && ordinal <= TPM2_CC_LAST)
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index = tpm2_ordinal_duration[ordinal - TPM2_CC_FIRST];
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if (index != TPM_UNDEFINED)
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duration = chip->vendor.duration[index];
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if (duration <= 0)
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duration = 2 * 60 * HZ;
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return duration;
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}
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EXPORT_SYMBOL_GPL(tpm2_calc_ordinal_duration);
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#define TPM2_SELF_TEST_IN_SIZE \
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(sizeof(struct tpm_input_header) + \
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sizeof(struct tpm2_self_test_in))
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static const struct tpm_input_header tpm2_selftest_header = {
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.tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
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.length = cpu_to_be32(TPM2_SELF_TEST_IN_SIZE),
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.ordinal = cpu_to_be32(TPM2_CC_SELF_TEST)
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};
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/**
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* tpm2_continue_selftest() - start a self test
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* @chip: TPM chip to use
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* @full: test all commands instead of testing only those that were not
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* previously tested.
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*
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* 0 is returned when the operation is successful. If a negative number is
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* returned it remarks a POSIX error code. If a positive number is returned
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* it remarks a TPM error.
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*/
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static int tpm2_start_selftest(struct tpm_chip *chip, bool full)
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{
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int rc;
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struct tpm2_cmd cmd;
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cmd.header.in = tpm2_selftest_header;
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cmd.params.selftest_in.full_test = full;
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rc = tpm_transmit_cmd(chip, &cmd, TPM2_SELF_TEST_IN_SIZE,
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"continue selftest");
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/* At least some prototype chips seem to give RC_TESTING error
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* immediately. This is a workaround for that.
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*/
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if (rc == TPM2_RC_TESTING) {
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dev_warn(chip->pdev, "Got RC_TESTING, ignoring\n");
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rc = 0;
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}
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return rc;
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}
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/**
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* tpm2_do_selftest() - run a full self test
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* @chip: TPM chip to use
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*
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* During the self test TPM2 commands return with the error code RC_TESTING.
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* Waiting is done by issuing PCR read until it executes successfully.
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*
|
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* 0 is returned when the operation is successful. If a negative number is
|
|
* returned it remarks a POSIX error code. If a positive number is returned
|
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* it remarks a TPM error.
|
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*/
|
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int tpm2_do_selftest(struct tpm_chip *chip)
|
|
{
|
|
int rc;
|
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unsigned int loops;
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unsigned int delay_msec = 100;
|
|
unsigned long duration;
|
|
struct tpm2_cmd cmd;
|
|
int i;
|
|
|
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duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST);
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|
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loops = jiffies_to_msecs(duration) / delay_msec;
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|
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rc = tpm2_start_selftest(chip, true);
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if (rc)
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return rc;
|
|
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for (i = 0; i < loops; i++) {
|
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/* Attempt to read a PCR value */
|
|
cmd.header.in = tpm2_pcrread_header;
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|
cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
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cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
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cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
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cmd.params.pcrread_in.pcr_select[0] = 0x01;
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cmd.params.pcrread_in.pcr_select[1] = 0x00;
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|
cmd.params.pcrread_in.pcr_select[2] = 0x00;
|
|
|
|
rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL);
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if (rc < 0)
|
|
break;
|
|
|
|
rc = be32_to_cpu(cmd.header.out.return_code);
|
|
if (rc != TPM2_RC_TESTING)
|
|
break;
|
|
|
|
msleep(delay_msec);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm2_do_selftest);
|
|
|
|
/**
|
|
* tpm2_gen_interrupt() - generate an interrupt
|
|
* @chip: TPM chip to use
|
|
*
|
|
* 0 is returned when the operation is successful. If a negative number is
|
|
* returned it remarks a POSIX error code. If a positive number is returned
|
|
* it remarks a TPM error.
|
|
*/
|
|
int tpm2_gen_interrupt(struct tpm_chip *chip)
|
|
{
|
|
u32 dummy;
|
|
|
|
return tpm2_get_tpm_pt(chip, 0x100, &dummy,
|
|
"attempting to generate an interrupt");
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm2_gen_interrupt);
|
|
|
|
/**
|
|
* tpm2_probe() - probe TPM 2.0
|
|
* @chip: TPM chip to use
|
|
*
|
|
* Send idempotent TPM 2.0 command and see whether TPM 2.0 chip replied based on
|
|
* the reply tag.
|
|
*/
|
|
int tpm2_probe(struct tpm_chip *chip)
|
|
{
|
|
struct tpm2_cmd cmd;
|
|
int rc;
|
|
|
|
cmd.header.in = tpm2_get_tpm_pt_header;
|
|
cmd.params.get_tpm_pt_in.cap_id = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES);
|
|
cmd.params.get_tpm_pt_in.property_id = cpu_to_be32(0x100);
|
|
cmd.params.get_tpm_pt_in.property_cnt = cpu_to_be32(1);
|
|
|
|
rc = tpm_transmit(chip, (const char *) &cmd, sizeof(cmd));
|
|
if (rc < 0)
|
|
return rc;
|
|
else if (rc < TPM_HEADER_SIZE)
|
|
return -EFAULT;
|
|
|
|
if (be16_to_cpu(cmd.header.out.tag) == TPM2_ST_NO_SESSIONS)
|
|
chip->flags |= TPM_CHIP_FLAG_TPM2;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tpm2_probe);
|