ocsp

Documentation

Overview

Package ocsp exposes OCSP signing functionality, much like the signer package does for certificate signing. It also provies a basic OCSP responder stack for serving pre-signed OCSP responses.

Package ocsp implements an OCSP responder based on a generic storage backend. It provides a couple of sample implementations. Because OCSP responders handle high query volumes, we have to be careful about how much logging we do. Error-level logs are reserved for problems internal to the server, that can be fixed by an administrator. Any type of incorrect input from a user should be logged and Info or below. For things that are logged on every request, Debug is the appropriate level.

Index

• Variables
• func ReasonStringToCode(reason string) (reasonCode int, err error)
• type DBSource
  • func (src DBSource) Response(req *ocsp.Request) ([]byte, bool)
• type InMemorySource
  • func (src InMemorySource) Response(request *ocsp.Request) (response []byte, present bool)
• type Responder
  • func NewResponder(source Source) *Responder
  • func (rs Responder) ServeHTTP(response http.ResponseWriter, request *http.Request)
• type SignRequest
• type Signer
  • func NewSigner(issuer, responder *x509.Certificate, key crypto.Signer, interval time.Duration) (Signer, error)
  • func NewSignerFromFile(issuerFile, responderFile, keyFile string, interval time.Duration) (Signer, error)
• type Source
  • func NewDBSource(dbAccessor certdb.Accessor) Source
  • func NewSourceFromFile(responseFile string) (Source, error)
• type StandardSigner
  • func (s StandardSigner) Sign(req SignRequest) ([]byte, error)

Variables

var StatusCode = map[string]int{
	"good":    ocsp.Good,
	"revoked": ocsp.Revoked,
	"unknown": ocsp.Unknown,
}

StatusCode is a map between string statuses sent by cli/api to ocsp int statuses

Functions

func ReasonStringToCode

func ReasonStringToCode(reason string) (reasonCode int, err error)

ReasonStringToCode tries to convert a reason string to an integer code

Types

type DBSource

type DBSource struct {
	Accessor certdb.Accessor
}

DBSource represnts a source of OCSP responses backed by the certdb package.

func (DBSource) Response

func (src DBSource) Response(req *ocsp.Request) ([]byte, bool)

Response implements cfssl.ocsp.responder.Source, which returns the OCSP response in the Database for the given request with the expiration date furthest in the future. Response also returns a bool that is false if there were any errors obtaining the OCSP response and/or no OCSP response is present in the DB for the given request. Response will return a true bool if the byte array returned is a valid OCSP response.

type InMemorySource

type InMemorySource map[string][]byte

An InMemorySource is a map from serialNumber -> der(response)

func (InMemorySource) Response

func (src InMemorySource) Response(request *ocsp.Request) (response []byte, present bool)

Response looks up an OCSP response to provide for a given request. InMemorySource looks up a response purely based on serial number, without regard to what issuer the request is asking for.

type Responder

type Responder struct {
	Source Source
	// contains filtered or unexported fields
}

A Responder object provides the HTTP logic to expose a Source of OCSP responses.

func NewResponder

func NewResponder(source Source) *Responder

NewResponder instantiates a Responder with the give Source.

func (Responder) ServeHTTP

func (rs Responder) ServeHTTP(response http.ResponseWriter, request *http.Request)

A Responder can process both GET and POST requests. The mapping from an OCSP request to an OCSP response is done by the Source; the Responder simply decodes the request, and passes back whatever response is provided by the source. Note: The caller must use http.StripPrefix to strip any path components (including '/') on GET requests. Do not use this responder in conjunction with http.NewServeMux, because the default handler will try to canonicalize path components by changing any strings of repeated '/' into a single '/', which will break the base64 encoding.

type SignRequest

type SignRequest struct {
	Certificate *x509.Certificate
	Status      string
	Reason      int
	RevokedAt   time.Time
	Extensions  []pkix.Extension
	// IssuerHash is the hashing function used to hash the issuer subject and public key
	// in the OCSP response. Valid values are crypto.SHA1, crypto.SHA256, crypto.SHA384,
	// and crypto.SHA512. If zero, the default is crypto.SHA1.
	IssuerHash crypto.Hash
}

SignRequest represents the desired contents of a specific OCSP response.

type Signer

type Signer interface {
	Sign(req SignRequest) ([]byte, error)
}

Signer represents a general signer of OCSP responses. It is responsible for populating all fields in the OCSP response that are not reflected in the SignRequest.

func NewSigner

func NewSigner(issuer, responder *x509.Certificate, key crypto.Signer, interval time.Duration) (Signer, error)

NewSigner simply constructs a new StandardSigner object from the inputs, taking the interval in seconds

func NewSignerFromFile

func NewSignerFromFile(issuerFile, responderFile, keyFile string, interval time.Duration) (Signer, error)

NewSignerFromFile reads the issuer cert, the responder cert and the responder key from PEM files, and takes an interval in seconds

type Source

type Source interface {
	Response(*ocsp.Request) ([]byte, bool)
}

Source represents the logical source of OCSP responses, i.e., the logic that actually chooses a response based on a request. In order to create an actual responder, wrap one of these in a Responder object and pass it to http.Handle.

func NewDBSource

func NewDBSource(dbAccessor certdb.Accessor) Source

NewDBSource creates a new DBSource type with an associated dbAccessor.

func NewSourceFromFile

func NewSourceFromFile(responseFile string) (Source, error)

NewSourceFromFile reads the named file into an InMemorySource. The file read by this function must contain whitespace-separated OCSP responses. Each OCSP response must be in base64-encoded DER form (i.e., PEM without headers or whitespace). Invalid responses are ignored. This function pulls the entire file into an InMemorySource.

type StandardSigner

type StandardSigner struct {
	// contains filtered or unexported fields
}

StandardSigner is the default concrete type of OCSP signer. It represents a single responder (represented by a key and certificate) speaking for a single issuer (certificate). It is assumed that OCSP responses are issued at a regular interval, which is used to compute the nextUpdate value based on the current time.

func (StandardSigner) Sign

func (s StandardSigner) Sign(req SignRequest) ([]byte, error)

Sign is used with an OCSP signer to request the issuance of an OCSP response.