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linux/drivers/char/tpm/tpm.h
Jarkko Sakkinen a74f8b3635 tpm: introduce tpm_buf 
This patch introduces struct tpm_buf that provides a string buffer for
constructing TPM commands. This allows to construct variable sized TPM
commands. For the buffer a page is allocated and mapped, which limits
maximum size to PAGE_SIZE.

Variable sized TPM commands are needed in order to add algorithmic
agility.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
2015-10-19 01:01:20 +02:00

539 lines
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/*
* Copyright (C) 2004 IBM Corporation
* Copyright (C) 2015 Intel Corporation
*
* Authors:
* Leendert van Doorn <leendert@watson.ibm.com>
* Dave Safford <safford@watson.ibm.com>
* Reiner Sailer <sailer@watson.ibm.com>
* Kylene Hall <kjhall@us.ibm.com>
*
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
*
* Device driver for TCG/TCPA TPM (trusted platform module).
* Specifications at www.trustedcomputinggroup.org
*
* 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, version 2 of the
* License.
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/tpm.h>
#include <linux/acpi.h>
#include <linux/cdev.h>
#include <linux/highmem.h>
enum tpm_const {
TPM_MINOR = 224, /* officially assigned */
TPM_BUFSIZE = 4096,
TPM_NUM_DEVICES = 256,
TPM_RETRY = 50, /* 5 seconds */
};
enum tpm_timeout {
TPM_TIMEOUT = 5, /* msecs */
TPM_TIMEOUT_RETRY = 100 /* msecs */
};
/* TPM addresses */
enum tpm_addr {
TPM_SUPERIO_ADDR = 0x2E,
TPM_ADDR = 0x4E,
};
/* Indexes the duration array */
enum tpm_duration {
TPM_SHORT = 0,
TPM_MEDIUM = 1,
TPM_LONG = 2,
TPM_UNDEFINED,
};
#define TPM_WARN_RETRY 0x800
#define TPM_WARN_DOING_SELFTEST 0x802
#define TPM_ERR_DEACTIVATED 0x6
#define TPM_ERR_DISABLED 0x7
#define TPM_ERR_INVALID_POSTINIT 38
#define TPM_HEADER_SIZE 10
enum tpm2_const {
TPM2_PLATFORM_PCR = 24,
TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
TPM2_TIMEOUT_A = 750,
TPM2_TIMEOUT_B = 2000,
TPM2_TIMEOUT_C = 200,
TPM2_TIMEOUT_D = 30,
TPM2_DURATION_SHORT = 20,
TPM2_DURATION_MEDIUM = 750,
TPM2_DURATION_LONG = 2000,
};
enum tpm2_structures {
TPM2_ST_NO_SESSIONS = 0x8001,
TPM2_ST_SESSIONS = 0x8002,
};
enum tpm2_return_codes {
TPM2_RC_INITIALIZE = 0x0100,
TPM2_RC_TESTING = 0x090A,
TPM2_RC_DISABLED = 0x0120,
};
enum tpm2_algorithms {
TPM2_ALG_SHA1 = 0x0004,
};
enum tpm2_command_codes {
TPM2_CC_FIRST = 0x011F,
TPM2_CC_SELF_TEST = 0x0143,
TPM2_CC_STARTUP = 0x0144,
TPM2_CC_SHUTDOWN = 0x0145,
TPM2_CC_GET_CAPABILITY = 0x017A,
TPM2_CC_GET_RANDOM = 0x017B,
TPM2_CC_PCR_READ = 0x017E,
TPM2_CC_PCR_EXTEND = 0x0182,
TPM2_CC_LAST = 0x018F,
};
enum tpm2_permanent_handles {
TPM2_RS_PW = 0x40000009,
};
enum tpm2_capabilities {
TPM2_CAP_TPM_PROPERTIES = 6,
};
enum tpm2_startup_types {
TPM2_SU_CLEAR = 0x0000,
TPM2_SU_STATE = 0x0001,
};
enum tpm2_start_method {
TPM2_START_ACPI = 2,
TPM2_START_FIFO = 6,
TPM2_START_CRB = 7,
TPM2_START_CRB_WITH_ACPI = 8,
};
struct tpm_chip;
struct tpm_vendor_specific {
void __iomem *iobase; /* ioremapped address */
unsigned long base; /* TPM base address */
int irq;
int probed_irq;
int region_size;
int have_region;
struct list_head list;
int locality;
unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
bool timeout_adjusted;
unsigned long duration[3]; /* jiffies */
bool duration_adjusted;
void *priv;
wait_queue_head_t read_queue;
wait_queue_head_t int_queue;
u16 manufacturer_id;
};
#define TPM_VPRIV(c) ((c)->vendor.priv)
#define TPM_VID_INTEL 0x8086
#define TPM_VID_WINBOND 0x1050
#define TPM_VID_STM 0x104A
#define TPM_PPI_VERSION_LEN 3
enum tpm_chip_flags {
TPM_CHIP_FLAG_REGISTERED = BIT(0),
TPM_CHIP_FLAG_TPM2 = BIT(1),
};
struct tpm_chip {
struct device *pdev; /* Device stuff */
struct device dev;
struct cdev cdev;
const struct tpm_class_ops *ops;
unsigned int flags;
int dev_num; /* /dev/tpm# */
char devname[7];
unsigned long is_open; /* only one allowed */
int time_expired;
struct mutex tpm_mutex; /* tpm is processing */
struct tpm_vendor_specific vendor;
struct dentry **bios_dir;
#ifdef CONFIG_ACPI
const struct attribute_group *groups[2];
unsigned int groups_cnt;
acpi_handle acpi_dev_handle;
char ppi_version[TPM_PPI_VERSION_LEN + 1];
#endif /* CONFIG_ACPI */
struct list_head list;
};
#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
static inline void tpm_chip_put(struct tpm_chip *chip)
{
module_put(chip->pdev->driver->owner);
}
static inline int tpm_read_index(int base, int index)
{
outb(index, base);
return inb(base+1) & 0xFF;
}
static inline void tpm_write_index(int base, int index, int value)
{
outb(index, base);
outb(value & 0xFF, base+1);
}
struct tpm_input_header {
__be16 tag;
__be32 length;
__be32 ordinal;
} __packed;
struct tpm_output_header {
__be16 tag;
__be32 length;
__be32 return_code;
} __packed;
#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
struct stclear_flags_t {
__be16 tag;
u8 deactivated;
u8 disableForceClear;
u8 physicalPresence;
u8 physicalPresenceLock;
u8 bGlobalLock;
} __packed;
struct tpm_version_t {
u8 Major;
u8 Minor;
u8 revMajor;
u8 revMinor;
} __packed;
struct tpm_version_1_2_t {
__be16 tag;
u8 Major;
u8 Minor;
u8 revMajor;
u8 revMinor;
} __packed;
struct timeout_t {
__be32 a;
__be32 b;
__be32 c;
__be32 d;
} __packed;
struct duration_t {
__be32 tpm_short;
__be32 tpm_medium;
__be32 tpm_long;
} __packed;
struct permanent_flags_t {
__be16 tag;
u8 disable;
u8 ownership;
u8 deactivated;
u8 readPubek;
u8 disableOwnerClear;
u8 allowMaintenance;
u8 physicalPresenceLifetimeLock;
u8 physicalPresenceHWEnable;
u8 physicalPresenceCMDEnable;
u8 CEKPUsed;
u8 TPMpost;
u8 TPMpostLock;
u8 FIPS;
u8 operator;
u8 enableRevokeEK;
u8 nvLocked;
u8 readSRKPub;
u8 tpmEstablished;
u8 maintenanceDone;
u8 disableFullDALogicInfo;
} __packed;
typedef union {
struct permanent_flags_t perm_flags;
struct stclear_flags_t stclear_flags;
bool owned;
__be32 num_pcrs;
struct tpm_version_t tpm_version;
struct tpm_version_1_2_t tpm_version_1_2;
__be32 manufacturer_id;
struct timeout_t timeout;
struct duration_t duration;
} cap_t;
enum tpm_capabilities {
TPM_CAP_FLAG = cpu_to_be32(4),
TPM_CAP_PROP = cpu_to_be32(5),
CAP_VERSION_1_1 = cpu_to_be32(0x06),
CAP_VERSION_1_2 = cpu_to_be32(0x1A)
};
enum tpm_sub_capabilities {
TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
};
struct tpm_getcap_params_in {
__be32 cap;
__be32 subcap_size;
__be32 subcap;
} __packed;
struct tpm_getcap_params_out {
__be32 cap_size;
cap_t cap;
} __packed;
struct tpm_readpubek_params_out {
u8 algorithm[4];
u8 encscheme[2];
u8 sigscheme[2];
__be32 paramsize;
u8 parameters[12]; /*assuming RSA*/
__be32 keysize;
u8 modulus[256];
u8 checksum[20];
} __packed;
typedef union {
struct tpm_input_header in;
struct tpm_output_header out;
} tpm_cmd_header;
struct tpm_pcrread_out {
u8 pcr_result[TPM_DIGEST_SIZE];
} __packed;
struct tpm_pcrread_in {
__be32 pcr_idx;
} __packed;
struct tpm_pcrextend_in {
__be32 pcr_idx;
u8 hash[TPM_DIGEST_SIZE];
} __packed;
/* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
* bytes, but 128 is still a relatively large number of random bytes and
* anything much bigger causes users of struct tpm_cmd_t to start getting
* compiler warnings about stack frame size. */
#define TPM_MAX_RNG_DATA 128
struct tpm_getrandom_out {
__be32 rng_data_len;
u8 rng_data[TPM_MAX_RNG_DATA];
} __packed;
struct tpm_getrandom_in {
__be32 num_bytes;
} __packed;
struct tpm_startup_in {
__be16 startup_type;
} __packed;
typedef union {
struct tpm_getcap_params_out getcap_out;
struct tpm_readpubek_params_out readpubek_out;
u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
struct tpm_getcap_params_in getcap_in;
struct tpm_pcrread_in pcrread_in;
struct tpm_pcrread_out pcrread_out;
struct tpm_pcrextend_in pcrextend_in;
struct tpm_getrandom_in getrandom_in;
struct tpm_getrandom_out getrandom_out;
struct tpm_startup_in startup_in;
} tpm_cmd_params;
struct tpm_cmd_t {
tpm_cmd_header header;
tpm_cmd_params params;
} __packed;
/* A string buffer type for constructing TPM commands. This is based on the
* ideas of string buffer code in security/keys/trusted.h but is heap based
* in order to keep the stack usage minimal.
*/
enum tpm_buf_flags {
TPM_BUF_OVERFLOW = BIT(0),
};
struct tpm_buf {
struct page *data_page;
unsigned int flags;
u8 *data;
};
static inline void tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
{
struct tpm_input_header *head;
buf->data_page = alloc_page(GFP_HIGHUSER);
if (!buf->data_page)
return -ENOMEM;
buf->flags = 0;
buf->data = kmap(buf->data_page);
head = (struct tpm_input_header *) buf->data;
head->tag = cpu_to_be16(tag);
head->length = cpu_to_be32(sizeof(*head));
head->ordinal = cpu_to_be32(ordinal);
return 0;
}
static inline void tpm_buf_destroy(struct tpm_buf *buf)
{
kunmap(buf->data_page);
__free_page(buf->data_page);
}
static inline u32 tpm_buf_length(struct tpm_buf *buf)
{
struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
return be32_to_cpu(head->length);
}
static inline u16 tpm_buf_tag(struct tpm_buf *buf)
{
struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
return be16_to_cpu(head->tag);
}
static inline void tpm_buf_append(struct tpm_buf *buf,
const unsigned char *new_data,
unsigned int new_len)
{
struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
u32 len = tpm_buf_length(buf);
/* Return silently if overflow has already happened. */
if (buf->flags & TPM_BUF_OVERFLOW)
return;
if ((len + new_len) > PAGE_SIZE) {
WARN(1, "tpm_buf: overflow\n");
buf->flags |= TPM_BUF_OVERFLOW;
return;
}
memcpy(&buf->data[len], new_data, new_len);
head->length = cpu_to_be32(len + new_len);
}
static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
{
tpm_buf_append(buf, &value, 1);
}
static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
{
__be16 value2 = cpu_to_be16(value);
tpm_buf_append(buf, (u8 *) &value2, 2);
}
static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
{
__be32 value2 = cpu_to_be32(value);
tpm_buf_append(buf, (u8 *) &value2, 4);
}
extern struct class *tpm_class;
extern dev_t tpm_devt;
extern const struct file_operations tpm_fops;
ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
size_t bufsiz);
ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
const char *desc);
extern int tpm_get_timeouts(struct tpm_chip *);
extern void tpm_gen_interrupt(struct tpm_chip *);
extern int tpm_do_selftest(struct tpm_chip *);
extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
extern int tpm_pm_suspend(struct device *);
extern int tpm_pm_resume(struct device *);
extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
wait_queue_head_t *, bool);
struct tpm_chip *tpm_chip_find_get(int chip_num);
extern struct tpm_chip *tpmm_chip_alloc(struct device *dev,
const struct tpm_class_ops *ops);
extern int tpm_chip_register(struct tpm_chip *chip);
extern void tpm_chip_unregister(struct tpm_chip *chip);
int tpm_sysfs_add_device(struct tpm_chip *chip);
void tpm_sysfs_del_device(struct tpm_chip *chip);
int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
#ifdef CONFIG_ACPI
extern void tpm_add_ppi(struct tpm_chip *chip);
#else
static inline void tpm_add_ppi(struct tpm_chip *chip)
{
}
#endif
int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
u32 *value, const char *desc);
extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
extern int tpm2_do_selftest(struct tpm_chip *chip);
extern int tpm2_gen_interrupt(struct tpm_chip *chip);
extern int tpm2_probe(struct tpm_chip *chip);
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