/* * Copyright (C) 2004 IBM Corporation * Copyright (C) 2015 Intel Corporation * * Authors: * Leendert van Doorn * Dave Safford * Reiner Sailer * Kylene Hall * * Maintained by: * * 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 #include #include #include #include #include #include #include #include #include #include enum tpm_const { TPM_MINOR = 224, /* officially assigned */ TPM_BUFSIZE = 4096, TPM_NUM_DEVICES = 65536, 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_HASH = 0x0083, /* RC_FMT1 */ TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */ TPM2_RC_DISABLED = 0x0120, TPM2_RC_TESTING = 0x090A, /* RC_WARN */ }; enum tpm2_algorithms { TPM2_ALG_SHA1 = 0x0004, TPM2_ALG_KEYEDHASH = 0x0008, TPM2_ALG_SHA256 = 0x000B, TPM2_ALG_SHA384 = 0x000C, TPM2_ALG_SHA512 = 0x000D, TPM2_ALG_NULL = 0x0010, TPM2_ALG_SM3_256 = 0x0012, }; enum tpm2_command_codes { TPM2_CC_FIRST = 0x011F, TPM2_CC_SELF_TEST = 0x0143, TPM2_CC_STARTUP = 0x0144, TPM2_CC_SHUTDOWN = 0x0145, TPM2_CC_CREATE = 0x0153, TPM2_CC_LOAD = 0x0157, TPM2_CC_UNSEAL = 0x015E, TPM2_CC_FLUSH_CONTEXT = 0x0165, 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, }; struct tpm_chip; struct tpm_vendor_specific { void __iomem *iobase; /* ioremapped address */ int irq; 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; }; #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 dev; struct cdev cdev; /* A driver callback under ops cannot be run unless ops_sem is held * (sometimes implicitly, eg for the sysfs code). ops becomes null * when the driver is unregistered, see tpm_try_get_ops. */ struct rw_semaphore ops_sem; const struct tpm_class_ops *ops; unsigned int flags; int dev_num; /* /dev/tpm# */ unsigned long is_open; /* only one allowed */ 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 */ }; #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev) 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 int 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; extern struct idr dev_nums_idr; 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); __must_check int tpm_try_get_ops(struct tpm_chip *chip); void tpm_put_ops(struct tpm_chip *chip); extern struct tpm_chip *tpm_chip_alloc(struct device *dev, const struct tpm_class_ops *ops); extern struct tpm_chip *tpmm_chip_alloc(struct device *pdev, 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); int tpm2_seal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); int tpm2_unseal_trusted(struct tpm_chip *chip, struct trusted_key_payload *payload, struct trusted_key_options *options); 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);