544 lines
13 KiB
C
544 lines
13 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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* Copyright (C) 2015 Intel Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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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 as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#ifndef __TPM_H__
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#define __TPM_H__
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/tpm.h>
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#include <linux/acpi.h>
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#include <linux/cdev.h>
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#include <linux/highmem.h>
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enum tpm_const {
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TPM_MINOR = 224, /* officially assigned */
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TPM_BUFSIZE = 4096,
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TPM_NUM_DEVICES = 65536,
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TPM_RETRY = 50, /* 5 seconds */
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};
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enum tpm_timeout {
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TPM_TIMEOUT = 5, /* msecs */
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TPM_TIMEOUT_RETRY = 100 /* msecs */
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};
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/* TPM addresses */
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enum tpm_addr {
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TPM_SUPERIO_ADDR = 0x2E,
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TPM_ADDR = 0x4E,
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};
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/* Indexes the duration array */
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enum tpm_duration {
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TPM_SHORT = 0,
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TPM_MEDIUM = 1,
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TPM_LONG = 2,
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TPM_UNDEFINED,
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};
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#define TPM_WARN_RETRY 0x800
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#define TPM_WARN_DOING_SELFTEST 0x802
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#define TPM_ERR_DEACTIVATED 0x6
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#define TPM_ERR_DISABLED 0x7
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#define TPM_ERR_INVALID_POSTINIT 38
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#define TPM_HEADER_SIZE 10
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enum tpm2_const {
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TPM2_PLATFORM_PCR = 24,
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TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
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TPM2_TIMEOUT_A = 750,
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TPM2_TIMEOUT_B = 2000,
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TPM2_TIMEOUT_C = 200,
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TPM2_TIMEOUT_D = 30,
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TPM2_DURATION_SHORT = 20,
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TPM2_DURATION_MEDIUM = 750,
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TPM2_DURATION_LONG = 2000,
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};
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enum tpm2_structures {
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TPM2_ST_NO_SESSIONS = 0x8001,
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TPM2_ST_SESSIONS = 0x8002,
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};
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enum tpm2_return_codes {
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TPM2_RC_HASH = 0x0083, /* RC_FMT1 */
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TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */
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TPM2_RC_DISABLED = 0x0120,
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TPM2_RC_TESTING = 0x090A, /* RC_WARN */
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};
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enum tpm2_algorithms {
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TPM2_ALG_SHA1 = 0x0004,
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TPM2_ALG_KEYEDHASH = 0x0008,
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TPM2_ALG_SHA256 = 0x000B,
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TPM2_ALG_SHA384 = 0x000C,
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TPM2_ALG_SHA512 = 0x000D,
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TPM2_ALG_NULL = 0x0010,
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TPM2_ALG_SM3_256 = 0x0012,
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};
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enum tpm2_command_codes {
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TPM2_CC_FIRST = 0x011F,
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TPM2_CC_SELF_TEST = 0x0143,
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TPM2_CC_STARTUP = 0x0144,
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TPM2_CC_SHUTDOWN = 0x0145,
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TPM2_CC_CREATE = 0x0153,
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TPM2_CC_LOAD = 0x0157,
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TPM2_CC_UNSEAL = 0x015E,
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TPM2_CC_FLUSH_CONTEXT = 0x0165,
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TPM2_CC_GET_CAPABILITY = 0x017A,
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TPM2_CC_GET_RANDOM = 0x017B,
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TPM2_CC_PCR_READ = 0x017E,
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TPM2_CC_PCR_EXTEND = 0x0182,
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TPM2_CC_LAST = 0x018F,
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};
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enum tpm2_permanent_handles {
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TPM2_RS_PW = 0x40000009,
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};
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enum tpm2_capabilities {
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TPM2_CAP_TPM_PROPERTIES = 6,
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};
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enum tpm2_startup_types {
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TPM2_SU_CLEAR = 0x0000,
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TPM2_SU_STATE = 0x0001,
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};
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#define TPM_VID_INTEL 0x8086
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#define TPM_VID_WINBOND 0x1050
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#define TPM_VID_STM 0x104A
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#define TPM_PPI_VERSION_LEN 3
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enum tpm_chip_flags {
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TPM_CHIP_FLAG_REGISTERED = BIT(0),
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TPM_CHIP_FLAG_TPM2 = BIT(1),
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TPM_CHIP_FLAG_IRQ = BIT(2),
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TPM_CHIP_FLAG_VIRTUAL = BIT(3),
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TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
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};
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struct tpm_chip {
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struct device dev;
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struct cdev cdev;
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/* A driver callback under ops cannot be run unless ops_sem is held
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* (sometimes implicitly, eg for the sysfs code). ops becomes null
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* when the driver is unregistered, see tpm_try_get_ops.
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*/
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struct rw_semaphore ops_sem;
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const struct tpm_class_ops *ops;
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unsigned int flags;
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int dev_num; /* /dev/tpm# */
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unsigned long is_open; /* only one allowed */
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struct mutex tpm_mutex; /* tpm is processing */
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unsigned long timeout_a; /* jiffies */
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unsigned long timeout_b; /* jiffies */
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unsigned long timeout_c; /* jiffies */
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unsigned long timeout_d; /* jiffies */
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bool timeout_adjusted;
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unsigned long duration[3]; /* jiffies */
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bool duration_adjusted;
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struct dentry **bios_dir;
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const struct attribute_group *groups[3];
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unsigned int groups_cnt;
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#ifdef CONFIG_ACPI
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acpi_handle acpi_dev_handle;
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char ppi_version[TPM_PPI_VERSION_LEN + 1];
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#endif /* CONFIG_ACPI */
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};
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#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
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static inline int tpm_read_index(int base, int index)
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{
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outb(index, base);
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return inb(base+1) & 0xFF;
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}
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static inline void tpm_write_index(int base, int index, int value)
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{
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outb(index, base);
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outb(value & 0xFF, base+1);
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}
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struct tpm_input_header {
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__be16 tag;
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__be32 length;
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__be32 ordinal;
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} __packed;
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struct tpm_output_header {
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__be16 tag;
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__be32 length;
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__be32 return_code;
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} __packed;
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#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
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struct stclear_flags_t {
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__be16 tag;
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u8 deactivated;
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u8 disableForceClear;
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u8 physicalPresence;
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u8 physicalPresenceLock;
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u8 bGlobalLock;
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} __packed;
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struct tpm_version_t {
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u8 Major;
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u8 Minor;
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u8 revMajor;
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u8 revMinor;
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} __packed;
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struct tpm_version_1_2_t {
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__be16 tag;
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u8 Major;
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u8 Minor;
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u8 revMajor;
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u8 revMinor;
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} __packed;
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struct timeout_t {
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__be32 a;
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__be32 b;
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__be32 c;
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__be32 d;
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} __packed;
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struct duration_t {
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__be32 tpm_short;
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__be32 tpm_medium;
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__be32 tpm_long;
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} __packed;
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struct permanent_flags_t {
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__be16 tag;
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u8 disable;
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u8 ownership;
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u8 deactivated;
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u8 readPubek;
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u8 disableOwnerClear;
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u8 allowMaintenance;
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u8 physicalPresenceLifetimeLock;
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u8 physicalPresenceHWEnable;
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u8 physicalPresenceCMDEnable;
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u8 CEKPUsed;
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u8 TPMpost;
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u8 TPMpostLock;
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u8 FIPS;
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u8 operator;
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u8 enableRevokeEK;
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u8 nvLocked;
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u8 readSRKPub;
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u8 tpmEstablished;
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u8 maintenanceDone;
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u8 disableFullDALogicInfo;
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} __packed;
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typedef union {
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struct permanent_flags_t perm_flags;
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struct stclear_flags_t stclear_flags;
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bool owned;
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__be32 num_pcrs;
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struct tpm_version_t tpm_version;
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struct tpm_version_1_2_t tpm_version_1_2;
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__be32 manufacturer_id;
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struct timeout_t timeout;
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struct duration_t duration;
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} cap_t;
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enum tpm_capabilities {
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TPM_CAP_FLAG = cpu_to_be32(4),
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TPM_CAP_PROP = cpu_to_be32(5),
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CAP_VERSION_1_1 = cpu_to_be32(0x06),
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CAP_VERSION_1_2 = cpu_to_be32(0x1A)
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};
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enum tpm_sub_capabilities {
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TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
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TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
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TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
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TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
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TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
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TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
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TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
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};
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struct tpm_getcap_params_in {
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__be32 cap;
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__be32 subcap_size;
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__be32 subcap;
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} __packed;
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struct tpm_getcap_params_out {
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__be32 cap_size;
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cap_t cap;
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} __packed;
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struct tpm_readpubek_params_out {
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u8 algorithm[4];
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u8 encscheme[2];
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u8 sigscheme[2];
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__be32 paramsize;
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u8 parameters[12]; /*assuming RSA*/
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__be32 keysize;
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u8 modulus[256];
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u8 checksum[20];
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} __packed;
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typedef union {
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struct tpm_input_header in;
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struct tpm_output_header out;
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} tpm_cmd_header;
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struct tpm_pcrread_out {
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u8 pcr_result[TPM_DIGEST_SIZE];
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} __packed;
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struct tpm_pcrread_in {
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__be32 pcr_idx;
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} __packed;
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struct tpm_pcrextend_in {
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__be32 pcr_idx;
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u8 hash[TPM_DIGEST_SIZE];
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} __packed;
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/* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
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* bytes, but 128 is still a relatively large number of random bytes and
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* anything much bigger causes users of struct tpm_cmd_t to start getting
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* compiler warnings about stack frame size. */
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#define TPM_MAX_RNG_DATA 128
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struct tpm_getrandom_out {
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__be32 rng_data_len;
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u8 rng_data[TPM_MAX_RNG_DATA];
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} __packed;
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struct tpm_getrandom_in {
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__be32 num_bytes;
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} __packed;
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struct tpm_startup_in {
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__be16 startup_type;
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} __packed;
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typedef union {
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struct tpm_getcap_params_out getcap_out;
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struct tpm_readpubek_params_out readpubek_out;
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u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
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struct tpm_getcap_params_in getcap_in;
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struct tpm_pcrread_in pcrread_in;
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struct tpm_pcrread_out pcrread_out;
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struct tpm_pcrextend_in pcrextend_in;
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struct tpm_getrandom_in getrandom_in;
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struct tpm_getrandom_out getrandom_out;
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struct tpm_startup_in startup_in;
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} tpm_cmd_params;
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struct tpm_cmd_t {
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tpm_cmd_header header;
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tpm_cmd_params params;
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} __packed;
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/* A string buffer type for constructing TPM commands. This is based on the
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* ideas of string buffer code in security/keys/trusted.h but is heap based
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* in order to keep the stack usage minimal.
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*/
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enum tpm_buf_flags {
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TPM_BUF_OVERFLOW = BIT(0),
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};
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struct tpm_buf {
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struct page *data_page;
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unsigned int flags;
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u8 *data;
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};
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static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
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{
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struct tpm_input_header *head;
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buf->data_page = alloc_page(GFP_HIGHUSER);
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if (!buf->data_page)
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return -ENOMEM;
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buf->flags = 0;
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buf->data = kmap(buf->data_page);
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head = (struct tpm_input_header *) buf->data;
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head->tag = cpu_to_be16(tag);
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head->length = cpu_to_be32(sizeof(*head));
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head->ordinal = cpu_to_be32(ordinal);
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return 0;
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}
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static inline void tpm_buf_destroy(struct tpm_buf *buf)
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{
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kunmap(buf->data_page);
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__free_page(buf->data_page);
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}
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static inline u32 tpm_buf_length(struct tpm_buf *buf)
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{
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struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
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return be32_to_cpu(head->length);
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}
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static inline u16 tpm_buf_tag(struct tpm_buf *buf)
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{
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struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
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return be16_to_cpu(head->tag);
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}
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static inline void tpm_buf_append(struct tpm_buf *buf,
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const unsigned char *new_data,
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unsigned int new_len)
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{
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struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
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u32 len = tpm_buf_length(buf);
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/* Return silently if overflow has already happened. */
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if (buf->flags & TPM_BUF_OVERFLOW)
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return;
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if ((len + new_len) > PAGE_SIZE) {
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WARN(1, "tpm_buf: overflow\n");
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buf->flags |= TPM_BUF_OVERFLOW;
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return;
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}
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memcpy(&buf->data[len], new_data, new_len);
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head->length = cpu_to_be32(len + new_len);
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}
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static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
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{
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tpm_buf_append(buf, &value, 1);
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}
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static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
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{
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__be16 value2 = cpu_to_be16(value);
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tpm_buf_append(buf, (u8 *) &value2, 2);
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}
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static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
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{
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__be32 value2 = cpu_to_be32(value);
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tpm_buf_append(buf, (u8 *) &value2, 4);
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}
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extern struct class *tpm_class;
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extern dev_t tpm_devt;
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extern const struct file_operations tpm_fops;
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extern struct idr dev_nums_idr;
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enum tpm_transmit_flags {
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TPM_TRANSMIT_UNLOCKED = BIT(0),
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};
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ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
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unsigned int flags);
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ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd, int len,
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unsigned int flags, const char *desc);
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ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
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const char *desc);
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int tpm_get_timeouts(struct tpm_chip *);
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int tpm1_auto_startup(struct tpm_chip *chip);
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int tpm_do_selftest(struct tpm_chip *chip);
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unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
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int tpm_pm_suspend(struct device *dev);
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int tpm_pm_resume(struct device *dev);
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int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
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wait_queue_head_t *queue, bool check_cancel);
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struct tpm_chip *tpm_chip_find_get(int chip_num);
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__must_check int tpm_try_get_ops(struct tpm_chip *chip);
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void tpm_put_ops(struct tpm_chip *chip);
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struct tpm_chip *tpm_chip_alloc(struct device *dev,
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const struct tpm_class_ops *ops);
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struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
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const struct tpm_class_ops *ops);
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int tpm_chip_register(struct tpm_chip *chip);
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void tpm_chip_unregister(struct tpm_chip *chip);
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void tpm_sysfs_add_device(struct tpm_chip *chip);
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int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
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#ifdef CONFIG_ACPI
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extern void tpm_add_ppi(struct tpm_chip *chip);
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#else
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static inline void tpm_add_ppi(struct tpm_chip *chip)
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{
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}
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#endif
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static inline inline u32 tpm2_rc_value(u32 rc)
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{
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return (rc & BIT(7)) ? rc & 0xff : rc;
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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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int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
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int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
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int tpm2_seal_trusted(struct tpm_chip *chip,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options);
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int tpm2_unseal_trusted(struct tpm_chip *chip,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options);
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ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
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u32 *value, const char *desc);
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int tpm2_auto_startup(struct tpm_chip *chip);
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void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
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unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
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int tpm2_probe(struct tpm_chip *chip);
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#endif
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