| /* SPDX-License-Identifier: BSD-3-Clause */ |
| |
| /* |
| * Functions for querying, manipulating and locking rollback indices |
| * stored in the TPM NVRAM. |
| */ |
| |
| #ifndef ANTIROLLBACK_H_ |
| #define ANTIROLLBACK_H_ |
| |
| #include <types.h> |
| #include <security/tpm/tspi.h> |
| #include <vb2_sha.h> |
| |
| struct vb2_context; |
| enum vb2_pcr_digest; |
| |
| /* TPM NVRAM location indices. */ |
| #define FIRMWARE_NV_INDEX 0x1007 |
| #define KERNEL_NV_INDEX 0x1008 |
| /* 0x1009 used to be used as a backup space. Think of conflicts if you |
| * want to use 0x1009 for something else. */ |
| #define BACKUP_NV_INDEX 0x1009 |
| #define FWMP_NV_INDEX 0x100a |
| /* 0x100b: Hash of MRC_CACHE training data for recovery boot */ |
| #define MRC_REC_HASH_NV_INDEX 0x100b |
| /* 0x100c: OOBE autoconfig public key hashes */ |
| /* 0x100d: Hash of MRC_CACHE training data for non-recovery boot */ |
| #define MRC_RW_HASH_NV_INDEX 0x100d |
| #define HASH_NV_SIZE VB2_SHA256_DIGEST_SIZE |
| |
| /* Structure definitions for TPM spaces */ |
| |
| /* Flags for firmware space */ |
| |
| /* |
| * Last boot was developer mode. TPM ownership is cleared when transitioning |
| * to/from developer mode. |
| */ |
| #define FLAG_LAST_BOOT_DEVELOPER 0x01 |
| |
| /* All functions return TPM_SUCCESS (zero) if successful, non-zero if error */ |
| |
| uint32_t antirollback_read_space_firmware(struct vb2_context *ctx); |
| |
| /** |
| * Write may be called if the versions change. |
| */ |
| uint32_t antirollback_write_space_firmware(struct vb2_context *ctx); |
| |
| /** |
| * Read and write kernel space in TPM. |
| */ |
| uint32_t antirollback_read_space_kernel(struct vb2_context *ctx); |
| uint32_t antirollback_write_space_kernel(struct vb2_context *ctx); |
| |
| /** |
| * Lock must be called. |
| */ |
| uint32_t antirollback_lock_space_firmware(void); |
| |
| /* |
| * Read MRC hash data from TPM. |
| * @param index index into TPM NVRAM where hash is stored The index |
| * can be set to either MRC_REC_HASH_NV_INDEX or |
| * MRC_RW_HASH_NV_INDEX depending upon whether we are |
| * booting in recovery or normal mode. |
| * @param data pointer to buffer where hash from TPM read into |
| * @param size size of buffer |
| */ |
| uint32_t antirollback_read_space_mrc_hash(uint32_t index, uint8_t *data, uint32_t size); |
| /* |
| * Write new hash data to MRC space in TPM.\ |
| * @param index index into TPM NVRAM where hash is stored The index |
| * can be set to either MRC_REC_HASH_NV_INDEX or |
| * MRC_RW_HASH_NV_INDEX depending upon whether we are |
| * booting in recovery or normal mode. |
| * @param data pointer to buffer of hash value to be written |
| * @param size size of buffer |
| */ |
| uint32_t antirollback_write_space_mrc_hash(uint32_t index, const uint8_t *data, |
| uint32_t size); |
| /* |
| * Lock down MRC hash space in TPM. |
| * @param index index into TPM NVRAM where hash is stored The index |
| * can be set to either MRC_REC_HASH_NV_INDEX or |
| * MRC_RW_HASH_NV_INDEX depending upon whether we are |
| * booting in recovery or normal mode. |
| */ |
| uint32_t antirollback_lock_space_mrc_hash(uint32_t index); |
| |
| #endif /* ANTIROLLBACK_H_ */ |