src/lib/tpm2_tlcl_structures.h

/*
 * Copyright 2016 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef __SRC_LIB_TPM2_TLCL_STRUCTURES_H
#define __SRC_LIB_TPM2_TLCL_STRUCTURES_H

/*
 * This file includes a subset of definitions of TPM protocol version 2.x
 * constants and structures needed for functions used in coreboot.
 */
#include <stdint.h>
#include <compiler.h>
#include <tpm_lite/tlcl.h>
#include <types.h>

/* This should be plenty for what firmware needs. */
#define TPM_BUFFER_SIZE 256

/* Basic TPM2 types. */
typedef uint16_t TPM_SU;
typedef uint16_t TPM_ALG_ID;
typedef uint32_t TPM_CC;
typedef uint32_t TPM_HANDLE;
typedef uint32_t TPM_RC;
typedef uint8_t TPMI_YES_NO;
typedef TPM_ALG_ID TPMI_ALG_HASH;
typedef TPM_HANDLE TPMI_DH_PCR;
typedef TPM_HANDLE TPMI_RH_NV_INDEX;
typedef TPM_HANDLE TPMI_RH_ENABLES;
typedef TPM_HANDLE TPMI_SH_AUTH_SESSION;
typedef TPM_HANDLE TPM_RH;

/* Some hardcoded algorithm values. */
#define TPM_ALG_HMAC   ((TPM_ALG_ID)0x0005)
#define TPM_ALG_NULL   ((TPM_ALG_ID)0x0010)
#define TPM_ALG_SHA1   ((TPM_ALG_ID)0x0004)
#define TPM_ALG_SHA256 ((TPM_ALG_ID)0x000b)

#define SHA256_DIGEST_SIZE 32

/* Some hardcoded hierarchies. */
#define TPM_RH_NULL         0x40000007
#define TPM_RS_PW           0x40000009
#define TPM_RH_PLATFORM     0x4000000C

typedef struct {
	uint16_t      size;
	uint8_t       *buffer;
} TPM2B;

/* Relevant TPM Command's structures. */
/* Common command/response header. */
struct tpm_header {
	uint16_t tpm_tag;
	uint32_t tpm_size;
	TPM_CC tpm_code;
} __packed;

/* TPM command codes. */
#define TPM2_Hierarchy_Control ((TPM_CC)0x00000121)
#define TPM2_Clear             ((TPM_CC)0x00000126)
#define TPM2_NV_DefineSpace    ((TPM_CC)0x0000012A)
#define TPM2_NV_Write          ((TPM_CC)0x00000137)
#define TPM2_NV_WriteLock      ((TPM_CC)0x00000138)
#define TPM2_SelfTest          ((TPM_CC)0x00000143)
#define TPM2_Startup           ((TPM_CC)0x00000144)
#define TPM2_NV_Read           ((TPM_CC)0x0000014E)
#define TPM2_GetCapability     ((TPM_CC)0x0000017A)
#define TPM2_PCR_Extend        ((TPM_CC)0x00000182)
/* TPM2 specifies vendor commands need to have this bit set. Vendor command
   space is defined by the lower 16 bits. */
#define TPM_CC_VENDOR_BIT_MASK 0x20000000
/* FIXME: below is not enough to differentiate between vendors commands
   of numerous devices. However, the current tpm2 APIs aren't very amenable
   to extending generically because the marshaling code is assuming all
   knowledge of all commands. */
#define TPM2_CR50_VENDOR_COMMAND ((TPM_CC)(TPM_CC_VENDOR_BIT_MASK | 0))
#define  TPM2_CR50_SUB_CMD_NVMEM_ENABLE_COMMITS (21)
#define  TPM2_CR50_SUB_CMD_TURN_UPDATE_ON (24)

/* Startup values. */
#define TPM_SU_CLEAR 0
#define TPM_SU_STATE 1

#define TPM_HT_PCR             0x00
#define TPM_HT_NV_INDEX        0x01
#define TPM_HT_HMAC_SESSION    0x02
#define TPM_HT_POLICY_SESSION  0x03

#define HR_SHIFT               24
#define HR_PCR                (TPM_HT_PCR <<  HR_SHIFT)
#define HR_HMAC_SESSION       (TPM_HT_HMAC_SESSION <<  HR_SHIFT)
#define HR_POLICY_SESSION     (TPM_HT_POLICY_SESSION <<  HR_SHIFT)
#define HR_TRANSIENT          (TPM_HT_TRANSIENT <<  HR_SHIFT)
#define HR_PERSISTENT         (TPM_HT_PERSISTENT <<  HR_SHIFT)
#define HR_NV_INDEX           (TPM_HT_NV_INDEX <<  HR_SHIFT)
#define HR_PERMANENT          (TPM_HT_PERMANENT <<  HR_SHIFT)
#define PCR_FIRST             (HR_PCR + 0)
#define PCR_LAST              (PCR_FIRST + IMPLEMENTATION_PCR-1)
#define HMAC_SESSION_FIRST    (HR_HMAC_SESSION + 0)
#define HMAC_SESSION_LAST     (HMAC_SESSION_FIRST+MAX_ACTIVE_SESSIONS-1)
#define LOADED_SESSION_FIRST  HMAC_SESSION_FIRST
#define LOADED_SESSION_LAST   HMAC_SESSION_LAST
#define POLICY_SESSION_FIRST  (HR_POLICY_SESSION + 0)
#define POLICY_SESSION_LAST   (POLICY_SESSION_FIRST + MAX_ACTIVE_SESSIONS-1)
#define TRANSIENT_FIRST       (HR_TRANSIENT + 0)
#define ACTIVE_SESSION_FIRST  POLICY_SESSION_FIRST
#define ACTIVE_SESSION_LAST   POLICY_SESSION_LAST
#define TRANSIENT_LAST        (TRANSIENT_FIRST+MAX_LOADED_OBJECTS-1)
#define PERSISTENT_FIRST      (HR_PERSISTENT + 0)
#define PERSISTENT_LAST       (PERSISTENT_FIRST + 0x00FFFFFF)
#define PLATFORM_PERSISTENT   (PERSISTENT_FIRST + 0x00800000)
#define NV_INDEX_FIRST        (HR_NV_INDEX + 0)
#define NV_INDEX_LAST         (NV_INDEX_FIRST + 0x00FFFFFF)
#define PERMANENT_FIRST       TPM_RH_FIRST
#define PERMANENT_LAST        TPM_RH_LAST

/* Tpm2 command tags. */
#define TPM_ST_NO_SESSIONS 0x8001
#define TPM_ST_SESSIONS    0x8002

/* Values copied from tpm2/tpm_types.h */
#define RC_VER1                                         0x100
#define TPM_RC_INITIALIZE         ((TPM_RC)(RC_VER1 + 0x000))
#define TPM_RC_NV_UNINITIALIZED	  ((TPM_RC)(RC_VER1 + 0x04A))

/*
 * Cr50 returns this code when an attempt is made to read an NV location which
 * has not yet been defined. This is an aggregation of various return code
 * extensions which may or may not match if a different TPM2 device is
 * used.
 */
#define TPM_RC_CR50_NV_UNDEFINED  0x28b

/* TPM command structures. */

struct tpm2_startup {
	TPM_SU  startup_type;
};

/* Various TPM capability types to use when querying the device. */
typedef uint32_t TPM_CAP;
#define TPM_CAP_TPM_PROPERTIES   ((TPM_CAP)0x00000006)

typedef TPM_HANDLE TPMI_RH_NV_AUTH;
typedef TPM_HANDLE TPMI_RH_NV_INDEX;

/* TPM Property capability constants. */
typedef uint32_t TPM_PT;
#define PT_GROUP                                   0x00000100
#define PT_VAR                                 (PT_GROUP * 2)
#define TPM_PT_PERMANENT               ((TPM_PT)(PT_VAR + 0))

/* Structures of payloads of various TPM2 commands. */
struct tpm2_get_capability {
	TPM_CAP capability;
	uint32_t property;
	uint32_t propertyCount;
};

/* get_capability response when PT_PERMANENT is requested. */
typedef struct {
	uint32_t ownerAuthSet       : 1;
	uint32_t endorsementAuthSet : 1;
	uint32_t lockoutAuthSet     : 1;
	uint32_t reserved3_7        : 5;
	uint32_t disableClear       : 1;
	uint32_t inLockout          : 1;
	uint32_t tpmGeneratedEPS    : 1;
	uint32_t reserved11_31      : 21;
} TPMA_PERMANENT;

typedef struct {
	uint32_t TPMA_NV_PPWRITE        : 1;
	uint32_t TPMA_NV_OWNERWRITE     : 1;
	uint32_t TPMA_NV_AUTHWRITE      : 1;
	uint32_t TPMA_NV_POLICYWRITE    : 1;
	uint32_t TPMA_NV_COUNTER        : 1;
	uint32_t TPMA_NV_BITS           : 1;
	uint32_t TPMA_NV_EXTEND         : 1;
	uint32_t reserved7_9            : 3;
	uint32_t TPMA_NV_POLICY_DELETE  : 1;
	uint32_t TPMA_NV_WRITELOCKED    : 1;
	uint32_t TPMA_NV_WRITEALL       : 1;
	uint32_t TPMA_NV_WRITEDEFINE    : 1;
	uint32_t TPMA_NV_WRITE_STCLEAR  : 1;
	uint32_t TPMA_NV_GLOBALLOCK     : 1;
	uint32_t TPMA_NV_PPREAD         : 1;
	uint32_t TPMA_NV_OWNERREAD      : 1;
	uint32_t TPMA_NV_AUTHREAD       : 1;
	uint32_t TPMA_NV_POLICYREAD     : 1;
	uint32_t reserved20_24          : 5;
	uint32_t TPMA_NV_NO_DA          : 1;
	uint32_t TPMA_NV_ORDERLY        : 1;
	uint32_t TPMA_NV_CLEAR_STCLEAR  : 1;
	uint32_t TPMA_NV_READLOCKED     : 1;
	uint32_t TPMA_NV_WRITTEN        : 1;
	uint32_t TPMA_NV_PLATFORMCREATE : 1;
	uint32_t TPMA_NV_READ_STCLEAR   : 1;
} TPMA_NV;

typedef union {
	struct {
		uint16_t  size;
		const uint8_t   *buffer;
	} t;
	TPM2B b;
} TPM2B_DIGEST;

typedef TPM2B_DIGEST TPM2B_AUTH;
typedef TPM2B_DIGEST TPM2B_NONCE;

typedef struct {
	TPM_PT  property;
	uint32_t  value;
} TPMS_TAGGED_PROPERTY;

#define MAX_CAP_DATA (TPM_BUFFER_SIZE - sizeof(struct tpm_header) - \
		      sizeof(TPMI_YES_NO) - sizeof(TPM_CAP) - sizeof(uint32_t))
#define MAX_TPM_PROPERTIES  (MAX_CAP_DATA/sizeof(TPMS_TAGGED_PROPERTY))

/* Somewhat arbitrary, leave enough room for command wrappers. */
#define MAX_NV_BUFFER_SIZE (TPM_BUFFER_SIZE - sizeof(struct tpm_header) - 50)

typedef struct {
	uint32_t              count;
	TPMS_TAGGED_PROPERTY  tpmProperty[MAX_TPM_PROPERTIES];
} TPML_TAGGED_TPM_PROPERTY;

typedef union {
	TPML_TAGGED_TPM_PROPERTY  tpmProperties;
} TPMU_CAPABILITIES;

typedef struct {
	TPM_CAP            capability;
	TPMU_CAPABILITIES  data;
} TPMS_CAPABILITY_DATA;

struct get_cap_response {
	TPMI_YES_NO more_data;
	TPMS_CAPABILITY_DATA cd;
};

typedef struct {
	TPMI_RH_NV_INDEX  nvIndex;
	TPMI_ALG_HASH     nameAlg;
	TPMA_NV           attributes;
	TPM2B_DIGEST      authPolicy;
	uint16_t          dataSize;
} TPMS_NV_PUBLIC;

typedef union {
	struct {
		uint16_t        size;
		TPMS_NV_PUBLIC  nvPublic;
	} t;
	TPM2B b;
} TPM2B_NV_PUBLIC;

typedef union {
	struct {
		uint16_t  size;
		const uint8_t   *buffer;
	} t;
	TPM2B b;
} TPM2B_MAX_NV_BUFFER;

/*
 * This is a union, but as of now we support just one digest - sha256, so
 * there is just one element.
 */
typedef union {
	uint8_t  sha256[SHA256_DIGEST_SIZE];
} TPMU_HA;

typedef struct {
	TPMI_ALG_HASH  hashAlg;
	TPMU_HA        digest;
} TPMT_HA;

typedef struct {
	uint32_t   count;
	TPMT_HA  digests[1];  /* Limit max number of hashes to 1. */
} TPML_DIGEST_VALUES;

struct nv_read_response {
	uint32_t params_size;
	TPM2B_MAX_NV_BUFFER buffer;
};

struct vendor_command_response {
	uint16_t vc_subcommand;
	union {
		uint8_t num_restored_headers;
	};
};

struct tpm2_session_attrs {
	uint8_t continueSession : 1;
	uint8_t auditExclusive  : 1;
	uint8_t auditReset      : 1;
	uint8_t reserved3_4     : 2;
	uint8_t decrypt         : 1;
	uint8_t encrypt         : 1;
	uint8_t audit           : 1;
};

/*
 * TPM session header for commands requiring session information. Also
 * included in the responses to those commands.
 */
struct tpm2_session_header {
	uint32_t session_handle;
	uint16_t nonce_size;
	uint8_t *nonce;
	union {
		struct tpm2_session_attrs session_attr_bits;
		uint8_t session_attrs;
	}  __packed;
	uint16_t auth_size;
	uint8_t *auth;
};

struct tpm2_response {
	struct tpm_header hdr;
	union {
		struct get_cap_response gc;
		struct nv_read_response nvr;
		struct tpm2_session_header def_space;
		struct vendor_command_response vcr;
	};
};

struct tpm2_nv_define_space_cmd {
	TPM2B_AUTH auth;
	TPMS_NV_PUBLIC publicInfo;
};

struct tpm2_nv_write_cmd {
	TPMI_RH_NV_INDEX nvIndex;
	TPM2B_MAX_NV_BUFFER data;
	uint16_t offset;
};

struct tpm2_self_test {
	TPMI_YES_NO yes_no;
};

struct tpm2_nv_read_cmd {
	TPMI_RH_NV_INDEX nvIndex;
	uint16_t size;
	uint16_t offset;
};

struct tpm2_nv_write_lock_cmd {
	TPMI_RH_NV_INDEX nvIndex;
};

struct tpm2_pcr_extend_cmd {
	TPMI_DH_PCR pcrHandle;
	TPML_DIGEST_VALUES digests;
};

struct tpm2_hierarchy_control_cmd {
	TPMI_RH_ENABLES enable;
	TPMI_YES_NO state;
};

#endif // __SRC_LIB_TPM2_TLCL_STRUCTURES_H