spamdef

spamdef

package spamdef provides some common definitions for TPM spams that don't need to be exposed in the main spam API, but should be unit testable.

Constants

TPMSpamAttributes is the set of TPM NV attributes for spam. As these are essential to the security properties of the library, they are discussed here. Attribute rationales:

• TPMA_NV_PPWRITE = 0: Can't write with Platform Authorization
• TPMA_NV_OWNERWRITE = 0: Can't write with Owner Authorization
• TPMA_NV_AUTHWRITE = 0: Can't write with Auth Value
• TPMA_NV_POLICYWRITE = 1: Can write with Policy
• TPMA_NV_POLICY_DELETE = 0: Can delete with Platform Authorization
• TPMA_NV_WRITELOCKED = 0: Not write locked (can't be set at creation)
• TPMA_NV_WRITEALL = 1: A partial write of the data is not allowed
• TPMA_NV_WRITEDEFINE = 0: May not be permanently write-locked
• TPMA_NV_WRITE_STCLEAR = 0: May not be write-locked until next boot
• TPMA_NV_GLOBALLOCK = 0: Is not affected by the global NV lock
• TPMA_NV_PPREAD = 0: Can't read with Platform Authorization
• TPMA_NV_OWNERREAD = 0: Can't read with Owner Authorization
• TPMA_NV_AUTHREAD = 1: Can read with Auth Value
• TPMA_NV_POLICYREAD = 0: Can't read with Policy
• TPMA_NV_NO_DA = 1: Exempt from Dictionary Attack logic
• TPMA_NV_ORDERLY = 0: NV writes are not deferred til clean shutdown
• TPMA_NV_CLEAR_STCLEAR = 1: TPMA_NV_WRITTEN is cleared by reboot
• TPMA_NV_READLOCKED = 0: Not read locked (can't be set at creation)
• TPMA_NV_WRITTEN = 0: Not already written (can't be set at creation)
• TPMA_NV_PLATFORMCREATE = 1: Undefined with Platform, not Owner Auth
• TPMA_NV_READ_STCLEAR = 0: May not be read-locked

const TPMSpamAttributes tpm2.NVAttr = tpm2.AttrPolicyWrite |
    tpm2.AttrWriteAll |
    tpm2.AttrAuthRead |
    tpm2.AttrNoDA |
    tpm2.AttrClearSTClear |
    tpm2.AttrPlatformCreate

TPMSpamOffset is the offset of the first spam in TPM NV memory. This is in "reserved Platform Handles" space per TCG.

const TPMSpamOffset = 0x017F0000

Functions

func Handle

func Handle(index uint16) (*tpmutil.Handle, error)

Handle returns the TPM NV index associated with the given spam handle.

func Name

func Name(index uint16) ([]byte, error)

Name returns the TPM name for a spam index.

func Policy

func Policy(alg crypto.Hash) ([]byte, error)

Policy returns the Policy hash for defining a TPM NV index as spam.

func Template

func Template(index uint16) (*tpm2.NVPublic, error)

Template returns the TPM NV template for a spam index.

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