trust

Documentation

Overview

Package trust defines core trust types and values for attestation verification.

Index

• Variables
• func ClearProductCertCache()
• func ParseCert(cert []byte) (*x509.Certificate, error)
• type AMDRootCerts
  • func (r *AMDRootCerts) Decode(ask []byte, ark []byte) error
  • func (r *AMDRootCerts) FromKDSCert(path string) error
  • func (r *AMDRootCerts) FromKDSCertBytes(data []byte) error
  • func (r *AMDRootCerts) Unmarshal(data []byte) error
  • func (r *AMDRootCerts) X509Options(now time.Time, key abi.ReportSigner) *x509.VerifyOptions
• type AttestationRecreationErr
  • func (e *AttestationRecreationErr) Error() string
• type HTTPSGetter
  • func DefaultHTTPSGetter() HTTPSGetter
• type ProductCerts
  • func GetProductChain(product string, s abi.ReportSigner, getter HTTPSGetter) (*ProductCerts, error)
  • func (r *ProductCerts) Decode(ask []byte, ark []byte) error
  • func (r *ProductCerts) FromKDSCert(path string) error
  • func (r *ProductCerts) FromKDSCertBytes(data []byte) error
  • func (r *ProductCerts) X509Options(now time.Time, key abi.ReportSigner) *x509.VerifyOptions
• type RetryHTTPSGetter
  • func (n *RetryHTTPSGetter) Get(url string) ([]byte, error)
• type SimpleHTTPSGetter
  • func (n *SimpleHTTPSGetter) Get(url string) ([]byte, error)

Variables

var (
	// DefaultRootCerts holds AMD's SEV API certificate format for ASK and ARK keys as published here
	// https://download.amd.com/developer/eula/sev/ask_ark_milan.cert
	DefaultRootCerts map[string]*AMDRootCerts
)

Functions

func ClearProductCertCache

func ClearProductCertCache()

ClearProductCertCache clears the product certificate cache. This is useful for testing with multiple roots of trust.

func ParseCert

func ParseCert(cert []byte) (*x509.Certificate, error)

ParseCert returns an X.509 Certificate type for a PEM[CERTIFICATE]- or DER-encoded cert.

Types

type AMDRootCerts

type AMDRootCerts struct {
	// Product is the expected CPU product name, e.g., Milan, Turin, Genoa.
	Product string
	// ProductCerts contains the root key and signing key devoted to a given product line.
	ProductCerts *ProductCerts
	// AskSev is the AMD certificate representation of the AMD signing key that certifies
	// versioned chip endoresement keys. If present, the information must match AskX509.
	AskSev *abi.AskCert
	// ArkSev is the AMD certificate representation of the self-signed AMD root key that
	// certifies the AMD signing key. If present, the information must match ArkX509.
	ArkSev *abi.AskCert
	// Mu protects concurrent accesses to CRL.
	Mu sync.Mutex
	// CRL is the certificate revocation list for this AMD product. Populated once, only when a
	// revocation is checked.
	CRL *x509.RevocationList
}

AMDRootCerts encapsulates the certificates that represent root of trust in AMD.

func (*AMDRootCerts) Decode

func (r *AMDRootCerts) Decode(ask []byte, ark []byte) error

Decode populates the AMDRootCerts from DER-formatted certificates for both the ASK and the ARK.

func (*AMDRootCerts) FromKDSCert

func (r *AMDRootCerts) FromKDSCert(path string) error

FromKDSCert populates r's AskX509 and ArkX509 certificates from the certificate format AMD's Key Distribution Service (KDS) uses, e.g., https://kdsintf.amd.com/vcek/v1/Milan/cert_chain

func (*AMDRootCerts) FromKDSCertBytes

func (r *AMDRootCerts) FromKDSCertBytes(data []byte) error

FromKDSCertBytes populates r's AskX509 and ArkX509 certificates from the two PEM-encoded certificates in data. This is the format the Key Distribution Service (KDS) uses, e.g., https://kdsintf.amd.com/vcek/v1/Milan/cert_chain

func (*AMDRootCerts) Unmarshal

func (r *AMDRootCerts) Unmarshal(data []byte) error

Unmarshal populates ASK and ARK certificates from AMD SEV format certificates in data.

func (*AMDRootCerts) X509Options

func (r *AMDRootCerts) X509Options(now time.Time, key abi.ReportSigner) *x509.VerifyOptions

X509Options returns the AS[V]K and ARK as the only intermediate and root certificates of an x509 verification options object, or nil if either key's x509 certificate is not present in r. Choice between ASK and ASVK is determined by key.

type AttestationRecreationErr

type AttestationRecreationErr struct {
	Msg string
}

AttestationRecreationErr represents a problem with fetching or interpreting associated certificates for a given attestation report. This is typically due to network unreliability.

func (*AttestationRecreationErr) Error

func (e *AttestationRecreationErr) Error() string

type HTTPSGetter

type HTTPSGetter interface {
	Get(url string) ([]byte, error)
}

HTTPSGetter represents the ability to fetch data from the internet from an HTTP URL. Used particularly for fetching certificates.

func DefaultHTTPSGetter

func DefaultHTTPSGetter() HTTPSGetter

DefaultHTTPSGetter returns the library's default getter implementation. It will retry slowly due to the AMD KDS's rate limiting.

type ProductCerts

type ProductCerts struct {
	Ask  *x509.Certificate
	Asvk *x509.Certificate
	Ark  *x509.Certificate
}

ProductCerts contains the root key and signing key devoted to a given product line.

func GetProductChain

func GetProductChain(product string, s abi.ReportSigner, getter HTTPSGetter) (*ProductCerts, error)

GetProductChain returns the ASK and ARK certificates of the given product, either from getter or from a cache of the results from the last successful call.

func (*ProductCerts) Decode

func (r *ProductCerts) Decode(ask []byte, ark []byte) error

Decode populates the ProductCerts from DER-formatted certificates for both the AS[V]K and the ARK.

func (*ProductCerts) FromKDSCert

func (r *ProductCerts) FromKDSCert(path string) error

FromKDSCert populates r's AskX509 and ArkX509 certificates from the certificate format AMD's Key Distribution Service (KDS) uses, e.g., https://kdsintf.amd.com/vcek/v1/Milan/cert_chain

func (*ProductCerts) FromKDSCertBytes

func (r *ProductCerts) FromKDSCertBytes(data []byte) error

FromKDSCertBytes populates r's AskX509 and ArkX509 certificates from the two PEM-encoded certificates in data. This is the format the Key Distribution Service (KDS) uses, e.g., https://kdsintf.amd.com/vcek/v1/Milan/cert_chain

func (*ProductCerts) X509Options

func (r *ProductCerts) X509Options(now time.Time, key abi.ReportSigner) *x509.VerifyOptions

X509Options returns the AS[V]K and ARK as the only intermediate and root certificates of an x509 verification options object, or nil if either key's x509 certificate is not present in r. The choice between ASK and ASVK is determined bey key.

type RetryHTTPSGetter

type RetryHTTPSGetter struct {
	// Timeout is how long to retry before failure.
	Timeout time.Duration
	// MaxRetryDelay is the maximum amount of time to wait between retries.
	MaxRetryDelay time.Duration
	// Getter is the non-retrying way of getting a URL.
	Getter HTTPSGetter
}

RetryHTTPSGetter is a meta-HTTPS getter that will retry on failure a given number of times.

func (*RetryHTTPSGetter) Get

func (n *RetryHTTPSGetter) Get(url string) ([]byte, error)

Get fetches the body of the URL, retrying a given amount of times on failure.

type SimpleHTTPSGetter

type SimpleHTTPSGetter struct{}

SimpleHTTPSGetter implements the HTTPSGetter interface with http.Get.

func (*SimpleHTTPSGetter) Get

func (n *SimpleHTTPSGetter) Get(url string) ([]byte, error)

Get uses http.Get to return the HTTPS response body as a byte array.