tpm: Support boot measurements
Add TPM2 functions to support boot measurement. This includes starting up the TPM, initializing/appending the event log, and measuring the U-Boot version. Much of the code was used in the EFI subsystem, so remove it there and use the common functions. Signed-off-by: Eddie James <eajames@linux.ibm.com> For the API moving around from EFI -> u-boot core Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> For EFI testing Tested-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Eddie James
Ilias Apalodimas
parent
54b96e8b2b
commit
97707f12fd
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@ -129,50 +129,6 @@ struct efi_tcg2_boot_service_capability {
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#define BOOT_SERVICE_CAPABILITY_MIN \
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offsetof(struct efi_tcg2_boot_service_capability, number_of_pcr_banks)
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#define TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03 "Spec ID Event03"
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#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2 2
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#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 0
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#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2 2
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/**
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* struct TCG_EfiSpecIdEventAlgorithmSize - hashing algorithm information
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*
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* @algorithm_id: algorithm defined in enum tpm2_algorithms
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* @digest_size: size of the algorithm
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*/
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struct tcg_efi_spec_id_event_algorithm_size {
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u16 algorithm_id;
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u16 digest_size;
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} __packed;
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/**
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* struct TCG_EfiSpecIDEventStruct - content of the event log header
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*
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* @signature: signature, set to Spec ID Event03
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* @platform_class: class defined in TCG ACPI Specification
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* Client Common Header.
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* @spec_version_minor: minor version
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* @spec_version_major: major version
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* @spec_version_errata: major version
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* @uintn_size: size of the efi_uintn_t fields used in various
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* data structures used in this specification.
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* 0x01 indicates u32 and 0x02 indicates u64
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* @number_of_algorithms: hashing algorithms used in this event log
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* @digest_sizes: array of number_of_algorithms pairs
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* 1st member defines the algorithm id
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* 2nd member defines the algorithm size
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*/
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struct tcg_efi_spec_id_event {
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u8 signature[16];
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u32 platform_class;
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u8 spec_version_minor;
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u8 spec_version_major;
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u8 spec_errata;
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u8 uintn_size;
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u32 number_of_algorithms;
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struct tcg_efi_spec_id_event_algorithm_size digest_sizes[];
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} __packed;
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/**
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* struct tdEFI_TCG2_FINAL_EVENTS_TABLE - log entries after Get Event Log
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* @version: version number for this structure
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259
include/tpm-v2.h
259
include/tpm-v2.h
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@ -216,6 +216,50 @@ struct tcg_pcr_event2 {
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u8 event[];
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} __packed;
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/**
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* struct TCG_EfiSpecIdEventAlgorithmSize - hashing algorithm information
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*
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* @algorithm_id: algorithm defined in enum tpm2_algorithms
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* @digest_size: size of the algorithm
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*/
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struct tcg_efi_spec_id_event_algorithm_size {
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u16 algorithm_id;
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u16 digest_size;
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} __packed;
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#define TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03 "Spec ID Event03"
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#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2 2
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#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 0
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#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2 2
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/**
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* struct TCG_EfiSpecIDEventStruct - content of the event log header
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*
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* @signature: signature, set to Spec ID Event03
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* @platform_class: class defined in TCG ACPI Specification
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* Client Common Header.
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* @spec_version_minor: minor version
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* @spec_version_major: major version
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* @spec_version_errata: major version
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* @uintn_size: size of the efi_uintn_t fields used in various
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* data structures used in this specification.
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* 0x01 indicates u32 and 0x02 indicates u64
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* @number_of_algorithms: hashing algorithms used in this event log
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* @digest_sizes: array of number_of_algorithms pairs
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* 1st member defines the algorithm id
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* 2nd member defines the algorithm size
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*/
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struct tcg_efi_spec_id_event {
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u8 signature[16];
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u32 platform_class;
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u8 spec_version_minor;
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u8 spec_version_major;
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u8 spec_errata;
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u8 uintn_size;
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u32 number_of_algorithms;
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struct tcg_efi_spec_id_event_algorithm_size digest_sizes[];
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} __packed;
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/**
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* TPM2 Structure Tags for command/response buffers.
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*
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@ -342,6 +386,26 @@ enum tpm2_algorithms {
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TPM2_ALG_SM3_256 = 0x12,
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};
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extern const enum tpm2_algorithms tpm2_supported_algorithms[4];
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static inline u16 tpm2_algorithm_to_len(enum tpm2_algorithms a)
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{
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switch (a) {
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case TPM2_ALG_SHA1:
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return TPM2_SHA1_DIGEST_SIZE;
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case TPM2_ALG_SHA256:
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return TPM2_SHA256_DIGEST_SIZE;
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case TPM2_ALG_SHA384:
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return TPM2_SHA384_DIGEST_SIZE;
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case TPM2_ALG_SHA512:
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return TPM2_SHA512_DIGEST_SIZE;
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default:
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return 0;
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}
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}
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#define tpm2_algorithm_to_mask(a) (1 << (a))
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/* NV index attributes */
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enum tpm_index_attrs {
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TPMA_NV_PPWRITE = 1UL << 0,
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@ -421,6 +485,188 @@ enum {
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HR_NV_INDEX = TPM_HT_NV_INDEX << HR_SHIFT,
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};
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/**
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* struct tcg2_event_log - Container for managing the platform event log
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*
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* @log: Address of the log
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* @log_position: Current entry position
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* @log_size: Log space available
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* @found: Boolean indicating if an existing log was discovered
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*/
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struct tcg2_event_log {
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u8 *log;
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u32 log_position;
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u32 log_size;
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bool found;
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};
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/**
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* Create a list of digests of the supported PCR banks for a given input data
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*
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* @dev TPM device
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* @input Data
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* @length Length of the data to calculate the digest
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* @digest_list List of digests to fill in
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
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struct tpml_digest_values *digest_list);
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/**
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* Get the event size of the specified digests
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*
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* @digest_list List of digests for the event
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*
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* Return: Size in bytes of the event
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*/
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u32 tcg2_event_get_size(struct tpml_digest_values *digest_list);
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/**
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* tcg2_get_active_pcr_banks
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*
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* @dev TPM device
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* @active_pcr_banks Bitmask of PCR algorithms supported
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks);
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/**
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* tcg2_log_append - Append an event to an event log
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*
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* @pcr_index Index of the PCR
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* @event_type Type of event
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* @digest_list List of digests to add
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* @size Size of event
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* @event Event data
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* @log Log buffer to append the event to
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*/
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void tcg2_log_append(u32 pcr_index, u32 event_type,
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struct tpml_digest_values *digest_list, u32 size,
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const u8 *event, u8 *log);
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/**
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* Extend the PCR with specified digests
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*
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* @dev TPM device
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* @pcr_index Index of the PCR
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* @digest_list List of digests to extend
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
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struct tpml_digest_values *digest_list);
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/**
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* Read the PCR into a list of digests
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*
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* @dev TPM device
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* @pcr_index Index of the PCR
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* @digest_list List of digests to extend
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
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struct tpml_digest_values *digest_list);
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/**
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* Measure data into the TPM PCRs and the platform event log.
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*
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* @dev TPM device
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* @log Platform event log
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* @pcr_index Index of the PCR
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* @size Size of the data or 0 for event only
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* @data Pointer to the data or NULL for event only
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* @event_type Event log type
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* @event_size Size of the event
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* @event Pointer to the event
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog,
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u32 pcr_index, u32 size, const u8 *data, u32 event_type,
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u32 event_size, const u8 *event);
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#define tcg2_measure_event(dev, elog, pcr_index, event_type, size, event) \
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tcg2_measure_data(dev, elog, pcr_index, 0, NULL, event_type, size, \
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event)
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/**
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* Prepare the event log buffer. This function tries to discover an existing
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* event log in memory from a previous bootloader stage. If such a log exists
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* and the PCRs are not extended, the log is "replayed" to extend the PCRs.
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* If no log is discovered, create the log header.
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*
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* @dev TPM device
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* @elog Platform event log. The log pointer and log_size
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* members must be initialized to either 0 or to a valid
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* memory region, in which case any existing log
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* discovered will be copied to the specified memory
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* region.
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* @ignore_existing_log Boolean to indicate whether or not to ignore an
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* existing platform log in memory
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog,
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bool ignore_existing_log);
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/**
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* Begin measurements.
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*
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* @dev TPM device
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* @elog Platform event log. The log pointer and log_size
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* members must be initialized to either 0 or to a valid
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* memory region, in which case any existing log
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* discovered will be copied to the specified memory
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* region.
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* @ignore_existing_log Boolean to indicate whether or not to ignore an
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* existing platform log in memory
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog,
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bool ignore_existing_log);
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/**
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* Stop measurements and record separator events.
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*
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* @dev TPM device
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* @elog Platform event log
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* @error Boolean to indicate whether an error ocurred or not
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*/
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void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
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bool error);
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/**
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* Get the platform event log address and size.
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*
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* @dev TPM device
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* @addr Address of the log
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* @size Size of the log
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size);
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/**
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* Get the first TPM2 device found.
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*
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* @dev TPM device
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*
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* Return: zero on success, negative errno otherwise
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*/
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int tcg2_platform_get_tpm2(struct udevice **dev);
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/**
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* Platform-specific function for handling TPM startup errors
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*
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* @dev TPM device
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* @rc The TPM response code
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*/
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void tcg2_platform_startup_error(struct udevice *dev, int rc);
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/**
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* Issue a TPM2_Startup command.
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*
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@ -540,6 +786,19 @@ u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
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u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
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void *buf, size_t prop_count);
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/**
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* tpm2_get_pcr_info() - get the supported, active PCRs and number of banks
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*
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* @dev: TPM device
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* @supported_pcr: bitmask with the algorithms supported
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* @active_pcr: bitmask with the active algorithms
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* @pcr_banks: number of PCR banks
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*
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* @return 0 on success, code of operation or negative errno on failure
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*/
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int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr, u32 *active_pcr,
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u32 *pcr_banks);
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/**
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* Issue a TPM2_DictionaryAttackLockReset command.
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*
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@ -431,6 +431,10 @@ config TPM
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bool "Trusted Platform Module (TPM) Support"
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depends on DM
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imply DM_RNG
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select SHA1
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select SHA256
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select SHA384
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select SHA512
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help
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This enables support for TPMs which can be used to provide security
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features for your board. The TPM can be connected via LPC or I2C
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File diff suppressed because it is too large
Load Diff
814
lib/tpm-v2.c
814
lib/tpm-v2.c
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@ -1,16 +1,705 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2023 Linaro Limited
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* Copyright (c) 2018 Bootlin
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* Author: Miquel Raynal <miquel.raynal@bootlin.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/of_access.h>
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#include <tpm_api.h>
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#include <tpm-common.h>
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#include <tpm-v2.h>
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#include <u-boot/sha1.h>
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#include <u-boot/sha256.h>
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#include <u-boot/sha512.h>
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#include <version_string.h>
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#include <asm/io.h>
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#include <linux/bitops.h>
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#include <linux/unaligned/be_byteshift.h>
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#include <linux/unaligned/generic.h>
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#include <linux/unaligned/le_byteshift.h>
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#include "tpm-utils.h"
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const enum tpm2_algorithms tpm2_supported_algorithms[4] = {
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TPM2_ALG_SHA1,
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TPM2_ALG_SHA256,
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TPM2_ALG_SHA384,
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TPM2_ALG_SHA512,
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};
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int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks)
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{
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u32 supported = 0;
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u32 pcr_banks = 0;
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u32 active = 0;
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int rc;
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rc = tpm2_get_pcr_info(dev, &supported, &active, &pcr_banks);
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if (rc)
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return rc;
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*active_pcr_banks = active;
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return 0;
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}
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u32 tcg2_event_get_size(struct tpml_digest_values *digest_list)
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{
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u32 len;
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size_t i;
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len = offsetof(struct tcg_pcr_event2, digests);
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len += offsetof(struct tpml_digest_values, digests);
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for (i = 0; i < digest_list->count; ++i) {
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u16 l = tpm2_algorithm_to_len(digest_list->digests[i].hash_alg);
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if (!l)
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continue;
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len += l + offsetof(struct tpmt_ha, digest);
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}
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len += sizeof(u32);
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return len;
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}
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int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
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struct tpml_digest_values *digest_list)
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{
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u8 final[sizeof(union tpmu_ha)];
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sha256_context ctx_256;
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sha512_context ctx_512;
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sha1_context ctx;
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u32 active;
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size_t i;
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u32 len;
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int rc;
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rc = tcg2_get_active_pcr_banks(dev, &active);
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if (rc)
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return rc;
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digest_list->count = 0;
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for (i = 0; i < ARRAY_SIZE(tpm2_supported_algorithms); ++i) {
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u32 mask =
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tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
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if (!(active & mask))
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continue;
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switch (tpm2_supported_algorithms[i]) {
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case TPM2_ALG_SHA1:
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sha1_starts(&ctx);
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sha1_update(&ctx, input, length);
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sha1_finish(&ctx, final);
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len = TPM2_SHA1_DIGEST_SIZE;
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break;
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case TPM2_ALG_SHA256:
|
||||
sha256_starts(&ctx_256);
|
||||
sha256_update(&ctx_256, input, length);
|
||||
sha256_finish(&ctx_256, final);
|
||||
len = TPM2_SHA256_DIGEST_SIZE;
|
||||
break;
|
||||
case TPM2_ALG_SHA384:
|
||||
sha384_starts(&ctx_512);
|
||||
sha384_update(&ctx_512, input, length);
|
||||
sha384_finish(&ctx_512, final);
|
||||
len = TPM2_SHA384_DIGEST_SIZE;
|
||||
break;
|
||||
case TPM2_ALG_SHA512:
|
||||
sha512_starts(&ctx_512);
|
||||
sha512_update(&ctx_512, input, length);
|
||||
sha512_finish(&ctx_512, final);
|
||||
len = TPM2_SHA512_DIGEST_SIZE;
|
||||
break;
|
||||
default:
|
||||
printf("%s: unsupported algorithm %x\n", __func__,
|
||||
tpm2_supported_algorithms[i]);
|
||||
continue;
|
||||
}
|
||||
|
||||
digest_list->digests[digest_list->count].hash_alg =
|
||||
tpm2_supported_algorithms[i];
|
||||
memcpy(&digest_list->digests[digest_list->count].digest, final,
|
||||
len);
|
||||
digest_list->count++;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void tcg2_log_append(u32 pcr_index, u32 event_type,
|
||||
struct tpml_digest_values *digest_list, u32 size,
|
||||
const u8 *event, u8 *log)
|
||||
{
|
||||
size_t len;
|
||||
size_t pos;
|
||||
u32 i;
|
||||
|
||||
pos = offsetof(struct tcg_pcr_event2, pcr_index);
|
||||
put_unaligned_le32(pcr_index, log);
|
||||
pos = offsetof(struct tcg_pcr_event2, event_type);
|
||||
put_unaligned_le32(event_type, log + pos);
|
||||
pos = offsetof(struct tcg_pcr_event2, digests) +
|
||||
offsetof(struct tpml_digest_values, count);
|
||||
put_unaligned_le32(digest_list->count, log + pos);
|
||||
|
||||
pos = offsetof(struct tcg_pcr_event2, digests) +
|
||||
offsetof(struct tpml_digest_values, digests);
|
||||
for (i = 0; i < digest_list->count; ++i) {
|
||||
u16 hash_alg = digest_list->digests[i].hash_alg;
|
||||
|
||||
len = tpm2_algorithm_to_len(hash_alg);
|
||||
if (!len)
|
||||
continue;
|
||||
|
||||
pos += offsetof(struct tpmt_ha, hash_alg);
|
||||
put_unaligned_le16(hash_alg, log + pos);
|
||||
pos += offsetof(struct tpmt_ha, digest);
|
||||
memcpy(log + pos, (u8 *)&digest_list->digests[i].digest, len);
|
||||
pos += len;
|
||||
}
|
||||
|
||||
put_unaligned_le32(size, log + pos);
|
||||
pos += sizeof(u32);
|
||||
memcpy(log + pos, event, size);
|
||||
}
|
||||
|
||||
static int tcg2_log_append_check(struct tcg2_event_log *elog, u32 pcr_index,
|
||||
u32 event_type,
|
||||
struct tpml_digest_values *digest_list,
|
||||
u32 size, const u8 *event)
|
||||
{
|
||||
u32 event_size;
|
||||
u8 *log;
|
||||
|
||||
event_size = size + tcg2_event_get_size(digest_list);
|
||||
if (elog->log_position + event_size > elog->log_size) {
|
||||
printf("%s: log too large: %u + %u > %u\n", __func__,
|
||||
elog->log_position, event_size, elog->log_size);
|
||||
return -ENOBUFS;
|
||||
}
|
||||
|
||||
log = elog->log + elog->log_position;
|
||||
elog->log_position += event_size;
|
||||
|
||||
tcg2_log_append(pcr_index, event_type, digest_list, size, event, log);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tcg2_log_init(struct udevice *dev, struct tcg2_event_log *elog)
|
||||
{
|
||||
struct tcg_efi_spec_id_event *ev;
|
||||
struct tcg_pcr_event *log;
|
||||
u32 event_size;
|
||||
u32 count = 0;
|
||||
u32 log_size;
|
||||
u32 active;
|
||||
u32 mask;
|
||||
size_t i;
|
||||
u16 len;
|
||||
int rc;
|
||||
|
||||
rc = tcg2_get_active_pcr_banks(dev, &active);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
event_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes);
|
||||
for (i = 0; i < ARRAY_SIZE(tpm2_supported_algorithms); ++i) {
|
||||
mask = tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
|
||||
|
||||
if (!(active & mask))
|
||||
continue;
|
||||
|
||||
switch (tpm2_supported_algorithms[i]) {
|
||||
case TPM2_ALG_SHA1:
|
||||
case TPM2_ALG_SHA256:
|
||||
case TPM2_ALG_SHA384:
|
||||
case TPM2_ALG_SHA512:
|
||||
count++;
|
||||
break;
|
||||
default:
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
event_size += 1 +
|
||||
(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count);
|
||||
log_size = offsetof(struct tcg_pcr_event, event) + event_size;
|
||||
|
||||
if (log_size > elog->log_size) {
|
||||
printf("%s: log too large: %u > %u\n", __func__, log_size,
|
||||
elog->log_size);
|
||||
return -ENOBUFS;
|
||||
}
|
||||
|
||||
log = (struct tcg_pcr_event *)elog->log;
|
||||
put_unaligned_le32(0, &log->pcr_index);
|
||||
put_unaligned_le32(EV_NO_ACTION, &log->event_type);
|
||||
memset(&log->digest, 0, sizeof(log->digest));
|
||||
put_unaligned_le32(event_size, &log->event_size);
|
||||
|
||||
ev = (struct tcg_efi_spec_id_event *)log->event;
|
||||
strlcpy((char *)ev->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
|
||||
sizeof(ev->signature));
|
||||
put_unaligned_le32(0, &ev->platform_class);
|
||||
ev->spec_version_minor = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2;
|
||||
ev->spec_version_major = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2;
|
||||
ev->spec_errata = TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2;
|
||||
ev->uintn_size = sizeof(size_t) / sizeof(u32);
|
||||
put_unaligned_le32(count, &ev->number_of_algorithms);
|
||||
|
||||
count = 0;
|
||||
for (i = 0; i < ARRAY_SIZE(tpm2_supported_algorithms); ++i) {
|
||||
mask = tpm2_algorithm_to_mask(tpm2_supported_algorithms[i]);
|
||||
|
||||
if (!(active & mask))
|
||||
continue;
|
||||
|
||||
len = tpm2_algorithm_to_len(tpm2_supported_algorithms[i]);
|
||||
if (!len)
|
||||
continue;
|
||||
|
||||
put_unaligned_le16(tpm2_supported_algorithms[i],
|
||||
&ev->digest_sizes[count].algorithm_id);
|
||||
put_unaligned_le16(len, &ev->digest_sizes[count].digest_size);
|
||||
count++;
|
||||
}
|
||||
|
||||
*((u8 *)ev + (event_size - 1)) = 0;
|
||||
elog->log_position = log_size;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tcg2_replay_eventlog(struct tcg2_event_log *elog,
|
||||
struct udevice *dev,
|
||||
struct tpml_digest_values *digest_list,
|
||||
u32 log_position)
|
||||
{
|
||||
const u32 offset = offsetof(struct tcg_pcr_event2, digests) +
|
||||
offsetof(struct tpml_digest_values, digests);
|
||||
u32 event_size;
|
||||
u32 count;
|
||||
u16 algo;
|
||||
u32 pcr;
|
||||
u32 pos;
|
||||
u16 len;
|
||||
u8 *log;
|
||||
int rc;
|
||||
u32 i;
|
||||
|
||||
while (log_position + offset < elog->log_size) {
|
||||
log = elog->log + log_position;
|
||||
|
||||
pos = offsetof(struct tcg_pcr_event2, pcr_index);
|
||||
pcr = get_unaligned_le32(log + pos);
|
||||
pos = offsetof(struct tcg_pcr_event2, event_type);
|
||||
if (!get_unaligned_le32(log + pos))
|
||||
return 0;
|
||||
|
||||
pos = offsetof(struct tcg_pcr_event2, digests) +
|
||||
offsetof(struct tpml_digest_values, count);
|
||||
count = get_unaligned_le32(log + pos);
|
||||
if (count > ARRAY_SIZE(tpm2_supported_algorithms) ||
|
||||
(digest_list->count && digest_list->count != count))
|
||||
return 0;
|
||||
|
||||
pos = offsetof(struct tcg_pcr_event2, digests) +
|
||||
offsetof(struct tpml_digest_values, digests);
|
||||
for (i = 0; i < count; ++i) {
|
||||
pos += offsetof(struct tpmt_ha, hash_alg);
|
||||
if (log_position + pos + sizeof(u16) >= elog->log_size)
|
||||
return 0;
|
||||
|
||||
algo = get_unaligned_le16(log + pos);
|
||||
pos += offsetof(struct tpmt_ha, digest);
|
||||
switch (algo) {
|
||||
case TPM2_ALG_SHA1:
|
||||
case TPM2_ALG_SHA256:
|
||||
case TPM2_ALG_SHA384:
|
||||
case TPM2_ALG_SHA512:
|
||||
len = tpm2_algorithm_to_len(algo);
|
||||
break;
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (digest_list->count) {
|
||||
if (algo != digest_list->digests[i].hash_alg ||
|
||||
log_position + pos + len >= elog->log_size)
|
||||
return 0;
|
||||
|
||||
memcpy(digest_list->digests[i].digest.sha512,
|
||||
log + pos, len);
|
||||
}
|
||||
|
||||
pos += len;
|
||||
}
|
||||
|
||||
if (log_position + pos + sizeof(u32) >= elog->log_size)
|
||||
return 0;
|
||||
|
||||
event_size = get_unaligned_le32(log + pos);
|
||||
pos += event_size + sizeof(u32);
|
||||
if (log_position + pos > elog->log_size)
|
||||
return 0;
|
||||
|
||||
if (digest_list->count) {
|
||||
rc = tcg2_pcr_extend(dev, pcr, digest_list);
|
||||
if (rc)
|
||||
return rc;
|
||||
}
|
||||
|
||||
log_position += pos;
|
||||
}
|
||||
|
||||
elog->log_position = log_position;
|
||||
elog->found = true;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int tcg2_log_parse(struct udevice *dev, struct tcg2_event_log *elog)
|
||||
{
|
||||
struct tpml_digest_values digest_list;
|
||||
struct tcg_efi_spec_id_event *event;
|
||||
struct tcg_pcr_event *log;
|
||||
u32 log_active;
|
||||
u32 calc_size;
|
||||
u32 active;
|
||||
u32 count;
|
||||
u32 evsz;
|
||||
u32 mask;
|
||||
u16 algo;
|
||||
u16 len;
|
||||
int rc;
|
||||
u32 i;
|
||||
u16 j;
|
||||
|
||||
if (elog->log_size <= offsetof(struct tcg_pcr_event, event))
|
||||
return 0;
|
||||
|
||||
log = (struct tcg_pcr_event *)elog->log;
|
||||
if (get_unaligned_le32(&log->pcr_index) != 0 ||
|
||||
get_unaligned_le32(&log->event_type) != EV_NO_ACTION)
|
||||
return 0;
|
||||
|
||||
for (i = 0; i < sizeof(log->digest); i++) {
|
||||
if (log->digest[i])
|
||||
return 0;
|
||||
}
|
||||
|
||||
evsz = get_unaligned_le32(&log->event_size);
|
||||
if (evsz < offsetof(struct tcg_efi_spec_id_event, digest_sizes) ||
|
||||
evsz + offsetof(struct tcg_pcr_event, event) > elog->log_size)
|
||||
return 0;
|
||||
|
||||
event = (struct tcg_efi_spec_id_event *)log->event;
|
||||
if (memcmp(event->signature, TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03,
|
||||
sizeof(TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03)))
|
||||
return 0;
|
||||
|
||||
if (event->spec_version_minor != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 ||
|
||||
event->spec_version_major != TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2)
|
||||
return 0;
|
||||
|
||||
count = get_unaligned_le32(&event->number_of_algorithms);
|
||||
if (count > ARRAY_SIZE(tpm2_supported_algorithms))
|
||||
return 0;
|
||||
|
||||
calc_size = offsetof(struct tcg_efi_spec_id_event, digest_sizes) +
|
||||
(sizeof(struct tcg_efi_spec_id_event_algorithm_size) * count) +
|
||||
1;
|
||||
if (evsz != calc_size)
|
||||
return 0;
|
||||
|
||||
rc = tcg2_get_active_pcr_banks(dev, &active);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
digest_list.count = 0;
|
||||
log_active = 0;
|
||||
|
||||
for (i = 0; i < count; ++i) {
|
||||
algo = get_unaligned_le16(&event->digest_sizes[i].algorithm_id);
|
||||
mask = tpm2_algorithm_to_mask(algo);
|
||||
|
||||
if (!(active & mask))
|
||||
return 0;
|
||||
|
||||
switch (algo) {
|
||||
case TPM2_ALG_SHA1:
|
||||
case TPM2_ALG_SHA256:
|
||||
case TPM2_ALG_SHA384:
|
||||
case TPM2_ALG_SHA512:
|
||||
len = get_unaligned_le16(&event->digest_sizes[i].digest_size);
|
||||
if (tpm2_algorithm_to_len(algo) != len)
|
||||
return 0;
|
||||
digest_list.digests[digest_list.count++].hash_alg = algo;
|
||||
break;
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
|
||||
log_active |= mask;
|
||||
}
|
||||
|
||||
/* Ensure the previous firmware extended all the PCRs. */
|
||||
if (log_active != active)
|
||||
return 0;
|
||||
|
||||
/* Read PCR0 to check if previous firmware extended the PCRs or not. */
|
||||
rc = tcg2_pcr_read(dev, 0, &digest_list);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
for (i = 0; i < digest_list.count; ++i) {
|
||||
len = tpm2_algorithm_to_len(digest_list.digests[i].hash_alg);
|
||||
for (j = 0; j < len; ++j) {
|
||||
if (digest_list.digests[i].digest.sha512[j])
|
||||
break;
|
||||
}
|
||||
|
||||
/* PCR is non-zero; it has been extended, so skip extending. */
|
||||
if (j != len) {
|
||||
digest_list.count = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return tcg2_replay_eventlog(elog, dev, &digest_list,
|
||||
offsetof(struct tcg_pcr_event, event) +
|
||||
evsz);
|
||||
}
|
||||
|
||||
int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
|
||||
struct tpml_digest_values *digest_list)
|
||||
{
|
||||
u32 rc;
|
||||
u32 i;
|
||||
|
||||
for (i = 0; i < digest_list->count; i++) {
|
||||
u32 alg = digest_list->digests[i].hash_alg;
|
||||
|
||||
rc = tpm2_pcr_extend(dev, pcr_index, alg,
|
||||
(u8 *)&digest_list->digests[i].digest,
|
||||
tpm2_algorithm_to_len(alg));
|
||||
if (rc) {
|
||||
printf("%s: error pcr:%u alg:%08x\n", __func__,
|
||||
pcr_index, alg);
|
||||
return rc;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
|
||||
struct tpml_digest_values *digest_list)
|
||||
{
|
||||
struct tpm_chip_priv *priv;
|
||||
u32 rc;
|
||||
u32 i;
|
||||
|
||||
priv = dev_get_uclass_priv(dev);
|
||||
if (!priv)
|
||||
return -ENODEV;
|
||||
|
||||
for (i = 0; i < digest_list->count; i++) {
|
||||
u32 alg = digest_list->digests[i].hash_alg;
|
||||
u8 *digest = (u8 *)&digest_list->digests[i].digest;
|
||||
|
||||
rc = tpm2_pcr_read(dev, pcr_index, priv->pcr_select_min, alg,
|
||||
digest, tpm2_algorithm_to_len(alg), NULL);
|
||||
if (rc) {
|
||||
printf("%s: error pcr:%u alg:%08x\n", __func__,
|
||||
pcr_index, alg);
|
||||
return rc;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog,
|
||||
u32 pcr_index, u32 size, const u8 *data, u32 event_type,
|
||||
u32 event_size, const u8 *event)
|
||||
{
|
||||
struct tpml_digest_values digest_list;
|
||||
int rc;
|
||||
|
||||
if (data)
|
||||
rc = tcg2_create_digest(dev, data, size, &digest_list);
|
||||
else
|
||||
rc = tcg2_create_digest(dev, event, event_size, &digest_list);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
rc = tcg2_pcr_extend(dev, pcr_index, &digest_list);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
return tcg2_log_append_check(elog, pcr_index, event_type, &digest_list,
|
||||
event_size, event);
|
||||
}
|
||||
|
||||
int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog,
|
||||
bool ignore_existing_log)
|
||||
{
|
||||
struct tcg2_event_log log;
|
||||
int rc;
|
||||
|
||||
elog->log_position = 0;
|
||||
elog->found = false;
|
||||
|
||||
rc = tcg2_platform_get_log(dev, (void **)&log.log, &log.log_size);
|
||||
if (!rc) {
|
||||
log.log_position = 0;
|
||||
log.found = false;
|
||||
|
||||
if (!ignore_existing_log) {
|
||||
rc = tcg2_log_parse(dev, &log);
|
||||
if (rc)
|
||||
return rc;
|
||||
}
|
||||
|
||||
if (elog->log_size) {
|
||||
if (log.found) {
|
||||
if (elog->log_size < log.log_position)
|
||||
return -ENOSPC;
|
||||
|
||||
/*
|
||||
* Copy the discovered log into the user buffer
|
||||
* if there's enough space.
|
||||
*/
|
||||
memcpy(elog->log, log.log, log.log_position);
|
||||
}
|
||||
|
||||
unmap_physmem(log.log, MAP_NOCACHE);
|
||||
} else {
|
||||
elog->log = log.log;
|
||||
elog->log_size = log.log_size;
|
||||
}
|
||||
|
||||
elog->log_position = log.log_position;
|
||||
elog->found = log.found;
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialize the log buffer if no log was discovered and the buffer is
|
||||
* valid. User's can pass in their own buffer as a fallback if no
|
||||
* memory region is found.
|
||||
*/
|
||||
if (!elog->found && elog->log_size)
|
||||
rc = tcg2_log_init(dev, elog);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog,
|
||||
bool ignore_existing_log)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = tcg2_platform_get_tpm2(dev);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
rc = tpm_auto_start(*dev);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
rc = tcg2_log_prepare_buffer(*dev, elog, ignore_existing_log);
|
||||
if (rc) {
|
||||
tcg2_measurement_term(*dev, elog, true);
|
||||
return rc;
|
||||
}
|
||||
|
||||
rc = tcg2_measure_event(*dev, elog, 0, EV_S_CRTM_VERSION,
|
||||
strlen(version_string) + 1,
|
||||
(u8 *)version_string);
|
||||
if (rc) {
|
||||
tcg2_measurement_term(*dev, elog, true);
|
||||
return rc;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
|
||||
bool error)
|
||||
{
|
||||
u32 event = error ? 0x1 : 0xffffffff;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 8; ++i)
|
||||
tcg2_measure_event(dev, elog, i, EV_SEPARATOR, sizeof(event),
|
||||
(const u8 *)&event);
|
||||
|
||||
if (elog->log)
|
||||
unmap_physmem(elog->log, MAP_NOCACHE);
|
||||
}
|
||||
|
||||
__weak int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size)
|
||||
{
|
||||
const __be32 *addr_prop;
|
||||
const __be32 *size_prop;
|
||||
int asize;
|
||||
int ssize;
|
||||
|
||||
*addr = NULL;
|
||||
*size = 0;
|
||||
|
||||
addr_prop = dev_read_prop(dev, "tpm_event_log_addr", &asize);
|
||||
if (!addr_prop)
|
||||
addr_prop = dev_read_prop(dev, "linux,sml-base", &asize);
|
||||
|
||||
size_prop = dev_read_prop(dev, "tpm_event_log_size", &ssize);
|
||||
if (!size_prop)
|
||||
size_prop = dev_read_prop(dev, "linux,sml-size", &ssize);
|
||||
|
||||
if (addr_prop && size_prop) {
|
||||
u64 a = of_read_number(addr_prop, asize / sizeof(__be32));
|
||||
u64 s = of_read_number(size_prop, ssize / sizeof(__be32));
|
||||
|
||||
*addr = map_physmem(a, s, MAP_NOCACHE);
|
||||
*size = (u32)s;
|
||||
} else {
|
||||
struct ofnode_phandle_args args;
|
||||
phys_addr_t a;
|
||||
fdt_size_t s;
|
||||
|
||||
if (dev_read_phandle_with_args(dev, "memory-region", NULL, 0,
|
||||
0, &args))
|
||||
return -ENODEV;
|
||||
|
||||
a = ofnode_get_addr_size(args.node, "reg", &s);
|
||||
if (a == FDT_ADDR_T_NONE)
|
||||
return -ENOMEM;
|
||||
|
||||
*addr = map_physmem(a, s, MAP_NOCACHE);
|
||||
*size = (u32)s;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
__weak int tcg2_platform_get_tpm2(struct udevice **dev)
|
||||
{
|
||||
for_each_tpm_device(*dev) {
|
||||
if (tpm_get_version(*dev) == TPM_V2)
|
||||
return 0;
|
||||
}
|
||||
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
__weak void tcg2_platform_startup_error(struct udevice *dev, int rc) {}
|
||||
|
||||
u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
|
||||
{
|
||||
const u8 command_v2[12] = {
|
||||
|
|
@ -359,6 +1048,131 @@ u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int tpm2_get_num_pcr(struct udevice *dev, u32 *num_pcr)
|
||||
{
|
||||
u8 response[(sizeof(struct tpms_capability_data) -
|
||||
offsetof(struct tpms_capability_data, data))];
|
||||
u32 properties_offset =
|
||||
offsetof(struct tpml_tagged_tpm_property, tpm_property) +
|
||||
offsetof(struct tpms_tagged_property, value);
|
||||
u32 ret;
|
||||
|
||||
memset(response, 0, sizeof(response));
|
||||
ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
|
||||
TPM2_PT_PCR_COUNT, response, 1);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
*num_pcr = get_unaligned_be32(response + properties_offset);
|
||||
if (*num_pcr > TPM2_MAX_PCRS) {
|
||||
printf("%s: too many pcrs: %u\n", __func__, *num_pcr);
|
||||
return -E2BIG;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool tpm2_is_active_pcr(struct tpms_pcr_selection *selection)
|
||||
{
|
||||
int i;
|
||||
|
||||
/*
|
||||
* check the pcr_select. If at least one of the PCRs supports the
|
||||
* algorithm add it on the active ones
|
||||
*/
|
||||
for (i = 0; i < selection->size_of_select; i++) {
|
||||
if (selection->pcr_select[i])
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr, u32 *active_pcr,
|
||||
u32 *pcr_banks)
|
||||
{
|
||||
u8 response[(sizeof(struct tpms_capability_data) -
|
||||
offsetof(struct tpms_capability_data, data))];
|
||||
struct tpml_pcr_selection pcrs;
|
||||
u32 num_pcr;
|
||||
size_t i;
|
||||
u32 ret;
|
||||
|
||||
*supported_pcr = 0;
|
||||
*active_pcr = 0;
|
||||
*pcr_banks = 0;
|
||||
memset(response, 0, sizeof(response));
|
||||
ret = tpm2_get_capability(dev, TPM2_CAP_PCRS, 0, response, 1);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
pcrs.count = get_unaligned_be32(response);
|
||||
/*
|
||||
* We only support 5 algorithms for now so check against that
|
||||
* instead of TPM2_NUM_PCR_BANKS
|
||||
*/
|
||||
if (pcrs.count > ARRAY_SIZE(tpm2_supported_algorithms) ||
|
||||
pcrs.count < 1) {
|
||||
printf("%s: too many pcrs: %u\n", __func__, pcrs.count);
|
||||
return -EMSGSIZE;
|
||||
}
|
||||
|
||||
ret = tpm2_get_num_pcr(dev, &num_pcr);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
for (i = 0; i < pcrs.count; i++) {
|
||||
/*
|
||||
* Definition of TPMS_PCR_SELECTION Structure
|
||||
* hash: u16
|
||||
* size_of_select: u8
|
||||
* pcr_select: u8 array
|
||||
*
|
||||
* The offsets depend on the number of the device PCRs
|
||||
* so we have to calculate them based on that
|
||||
*/
|
||||
u32 hash_offset = offsetof(struct tpml_pcr_selection, selection) +
|
||||
i * offsetof(struct tpms_pcr_selection, pcr_select) +
|
||||
i * ((num_pcr + 7) / 8);
|
||||
u32 size_select_offset =
|
||||
hash_offset + offsetof(struct tpms_pcr_selection,
|
||||
size_of_select);
|
||||
u32 pcr_select_offset =
|
||||
hash_offset + offsetof(struct tpms_pcr_selection,
|
||||
pcr_select);
|
||||
|
||||
pcrs.selection[i].hash =
|
||||
get_unaligned_be16(response + hash_offset);
|
||||
pcrs.selection[i].size_of_select =
|
||||
__get_unaligned_be(response + size_select_offset);
|
||||
if (pcrs.selection[i].size_of_select > TPM2_PCR_SELECT_MAX) {
|
||||
printf("%s: pcrs selection too large: %u\n", __func__,
|
||||
pcrs.selection[i].size_of_select);
|
||||
return -ENOBUFS;
|
||||
}
|
||||
/* copy the array of pcr_select */
|
||||
memcpy(pcrs.selection[i].pcr_select, response + pcr_select_offset,
|
||||
pcrs.selection[i].size_of_select);
|
||||
}
|
||||
|
||||
for (i = 0; i < pcrs.count; i++) {
|
||||
u32 hash_mask = tpm2_algorithm_to_mask(pcrs.selection[i].hash);
|
||||
|
||||
if (hash_mask) {
|
||||
*supported_pcr |= hash_mask;
|
||||
if (tpm2_is_active_pcr(&pcrs.selection[i]))
|
||||
*active_pcr |= hash_mask;
|
||||
} else {
|
||||
printf("%s: unknown algorithm %x\n", __func__,
|
||||
pcrs.selection[i].hash);
|
||||
}
|
||||
}
|
||||
|
||||
*pcr_banks = pcrs.count;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz)
|
||||
{
|
||||
u8 command_v2[COMMAND_BUFFER_SIZE] = {
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user