593 lines
18 KiB
Go
593 lines
18 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package ocsp parses OCSP responses as specified in RFC 2560. OCSP responses
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// are signed messages attesting to the validity of a certificate for a small
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// period of time. This is used to manage revocation for X.509 certificates.
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package ocsp
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha1"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/asn1"
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"errors"
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"math/big"
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"time"
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)
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var idPKIXOCSPBasic = asn1.ObjectIdentifier([]int{1, 3, 6, 1, 5, 5, 7, 48, 1, 1})
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// These are internal structures that reflect the ASN.1 structure of an OCSP
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// response. See RFC 2560, section 4.2.
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const (
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ocspSuccess = 0
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ocspMalformed = 1
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ocspInternalError = 2
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ocspTryLater = 3
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ocspSigRequired = 4
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ocspUnauthorized = 5
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)
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type certID struct {
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HashAlgorithm pkix.AlgorithmIdentifier
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NameHash []byte
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IssuerKeyHash []byte
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SerialNumber *big.Int
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}
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// https://tools.ietf.org/html/rfc2560#section-4.1.1
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type ocspRequest struct {
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TBSRequest tbsRequest
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}
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type tbsRequest struct {
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Version int `asn1:"explicit,tag:0,default:0,optional"`
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RequestorName pkix.RDNSequence `asn1:"explicit,tag:1,optional"`
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RequestList []request
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}
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type request struct {
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Cert certID
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}
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type responseASN1 struct {
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Status asn1.Enumerated
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Response responseBytes `asn1:"explicit,tag:0"`
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}
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type responseBytes struct {
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ResponseType asn1.ObjectIdentifier
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Response []byte
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}
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type basicResponse struct {
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TBSResponseData responseData
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SignatureAlgorithm pkix.AlgorithmIdentifier
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Signature asn1.BitString
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Certificates []asn1.RawValue `asn1:"explicit,tag:0,optional"`
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}
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type responseData struct {
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Raw asn1.RawContent
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Version int `asn1:"optional,default:1,explicit,tag:0"`
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RawResponderName asn1.RawValue `asn1:"optional,explicit,tag:1"`
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KeyHash []byte `asn1:"optional,explicit,tag:2"`
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ProducedAt time.Time `asn1:"generalized"`
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Responses []singleResponse
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}
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type singleResponse struct {
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CertID certID
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Good asn1.Flag `asn1:"tag:0,optional"`
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Revoked revokedInfo `asn1:"explicit,tag:1,optional"`
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Unknown asn1.Flag `asn1:"tag:2,optional"`
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ThisUpdate time.Time `asn1:"generalized"`
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NextUpdate time.Time `asn1:"generalized,explicit,tag:0,optional"`
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}
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type revokedInfo struct {
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RevocationTime time.Time `asn1:"generalized"`
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Reason int `asn1:"explicit,tag:0,optional"`
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}
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var (
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oidSignatureMD2WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 2}
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oidSignatureMD5WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 4}
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oidSignatureSHA1WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 5}
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oidSignatureSHA256WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 11}
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oidSignatureSHA384WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 12}
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oidSignatureSHA512WithRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 13}
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oidSignatureDSAWithSHA1 = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 3}
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oidSignatureDSAWithSHA256 = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 4, 3, 2}
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oidSignatureECDSAWithSHA1 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 1}
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oidSignatureECDSAWithSHA256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 2}
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oidSignatureECDSAWithSHA384 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 3}
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oidSignatureECDSAWithSHA512 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 4}
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)
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var hashOIDs = map[crypto.Hash]asn1.ObjectIdentifier{
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crypto.SHA1: asn1.ObjectIdentifier([]int{1, 3, 14, 3, 2, 26}),
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crypto.SHA256: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 1}),
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crypto.SHA384: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 2}),
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crypto.SHA512: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 3}),
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}
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// TODO(rlb): This is also from crypto/x509, so same comment as AGL's below
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var signatureAlgorithmDetails = []struct {
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algo x509.SignatureAlgorithm
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oid asn1.ObjectIdentifier
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pubKeyAlgo x509.PublicKeyAlgorithm
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hash crypto.Hash
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}{
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{x509.MD2WithRSA, oidSignatureMD2WithRSA, x509.RSA, crypto.Hash(0) /* no value for MD2 */},
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{x509.MD5WithRSA, oidSignatureMD5WithRSA, x509.RSA, crypto.MD5},
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{x509.SHA1WithRSA, oidSignatureSHA1WithRSA, x509.RSA, crypto.SHA1},
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{x509.SHA256WithRSA, oidSignatureSHA256WithRSA, x509.RSA, crypto.SHA256},
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{x509.SHA384WithRSA, oidSignatureSHA384WithRSA, x509.RSA, crypto.SHA384},
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{x509.SHA512WithRSA, oidSignatureSHA512WithRSA, x509.RSA, crypto.SHA512},
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{x509.DSAWithSHA1, oidSignatureDSAWithSHA1, x509.DSA, crypto.SHA1},
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{x509.DSAWithSHA256, oidSignatureDSAWithSHA256, x509.DSA, crypto.SHA256},
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{x509.ECDSAWithSHA1, oidSignatureECDSAWithSHA1, x509.ECDSA, crypto.SHA1},
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{x509.ECDSAWithSHA256, oidSignatureECDSAWithSHA256, x509.ECDSA, crypto.SHA256},
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{x509.ECDSAWithSHA384, oidSignatureECDSAWithSHA384, x509.ECDSA, crypto.SHA384},
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{x509.ECDSAWithSHA512, oidSignatureECDSAWithSHA512, x509.ECDSA, crypto.SHA512},
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}
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// TODO(rlb): This is also from crypto/x509, so same comment as AGL's below
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func signingParamsForPublicKey(pub interface{}, requestedSigAlgo x509.SignatureAlgorithm) (hashFunc crypto.Hash, sigAlgo pkix.AlgorithmIdentifier, err error) {
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var pubType x509.PublicKeyAlgorithm
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switch pub := pub.(type) {
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case *rsa.PublicKey:
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pubType = x509.RSA
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hashFunc = crypto.SHA256
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sigAlgo.Algorithm = oidSignatureSHA256WithRSA
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sigAlgo.Parameters = asn1.RawValue{
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Tag: 5,
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}
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case *ecdsa.PublicKey:
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pubType = x509.ECDSA
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switch pub.Curve {
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case elliptic.P224(), elliptic.P256():
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hashFunc = crypto.SHA256
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sigAlgo.Algorithm = oidSignatureECDSAWithSHA256
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case elliptic.P384():
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hashFunc = crypto.SHA384
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sigAlgo.Algorithm = oidSignatureECDSAWithSHA384
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case elliptic.P521():
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hashFunc = crypto.SHA512
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sigAlgo.Algorithm = oidSignatureECDSAWithSHA512
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default:
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err = errors.New("x509: unknown elliptic curve")
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}
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default:
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err = errors.New("x509: only RSA and ECDSA keys supported")
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}
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if err != nil {
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return
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}
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if requestedSigAlgo == 0 {
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return
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}
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found := false
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for _, details := range signatureAlgorithmDetails {
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if details.algo == requestedSigAlgo {
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if details.pubKeyAlgo != pubType {
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err = errors.New("x509: requested SignatureAlgorithm does not match private key type")
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return
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}
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sigAlgo.Algorithm, hashFunc = details.oid, details.hash
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if hashFunc == 0 {
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err = errors.New("x509: cannot sign with hash function requested")
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return
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}
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found = true
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break
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}
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}
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if !found {
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err = errors.New("x509: unknown SignatureAlgorithm")
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}
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return
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}
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// TODO(agl): this is taken from crypto/x509 and so should probably be exported
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// from crypto/x509 or crypto/x509/pkix.
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func getSignatureAlgorithmFromOID(oid asn1.ObjectIdentifier) x509.SignatureAlgorithm {
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for _, details := range signatureAlgorithmDetails {
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if oid.Equal(details.oid) {
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return details.algo
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}
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}
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return x509.UnknownSignatureAlgorithm
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}
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// TODO(rlb): This is not taken from crypto/x509, but it's of the same general form.
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func getHashAlgorithmFromOID(target asn1.ObjectIdentifier) crypto.Hash {
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for hash, oid := range hashOIDs {
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if oid.Equal(target) {
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return hash
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}
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}
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return crypto.Hash(0)
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}
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// This is the exposed reflection of the internal OCSP structures.
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const (
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// Good means that the certificate is valid.
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Good = iota
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// Revoked means that the certificate has been deliberately revoked.
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Revoked = iota
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// Unknown means that the OCSP responder doesn't know about the certificate.
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Unknown = iota
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// ServerFailed means that the OCSP responder failed to process the request.
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ServerFailed = iota
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)
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// Request represents an OCSP request. See RFC 2560.
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type Request struct {
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HashAlgorithm crypto.Hash
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IssuerNameHash []byte
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IssuerKeyHash []byte
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SerialNumber *big.Int
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}
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// Response represents an OCSP response. See RFC 2560.
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type Response struct {
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// Status is one of {Good, Revoked, Unknown, ServerFailed}
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Status int
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SerialNumber *big.Int
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ProducedAt, ThisUpdate, NextUpdate, RevokedAt time.Time
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RevocationReason int
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Certificate *x509.Certificate
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// TBSResponseData contains the raw bytes of the signed response. If
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// Certificate is nil then this can be used to verify Signature.
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TBSResponseData []byte
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Signature []byte
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SignatureAlgorithm x509.SignatureAlgorithm
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}
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// These are pre-serialized error responses for the various non-success codes
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// defined by OCSP. The Unauthorized code in particular can be used by an OCSP
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// responder that supports only pre-signed responses as a response to requests
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// for certificates with unknown status. See RFC 5019.
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var (
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MalformedRequestErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x01}
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InternalErrorErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x02}
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TryLaterErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x03}
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SigRequredErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x05}
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UnauthorizedErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x06}
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)
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// CheckSignatureFrom checks that the signature in resp is a valid signature
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// from issuer. This should only be used if resp.Certificate is nil. Otherwise,
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// the OCSP response contained an intermediate certificate that created the
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// signature. That signature is checked by ParseResponse and only
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// resp.Certificate remains to be validated.
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func (resp *Response) CheckSignatureFrom(issuer *x509.Certificate) error {
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return issuer.CheckSignature(resp.SignatureAlgorithm, resp.TBSResponseData, resp.Signature)
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}
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// ParseError results from an invalid OCSP response.
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type ParseError string
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func (p ParseError) Error() string {
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return string(p)
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}
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// ParseRequest parses an OCSP request in DER form. It only supports
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// requests for a single certificate. Signed requests are not supported.
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// If a request includes a signature, it will result in a ParseError.
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func ParseRequest(bytes []byte) (*Request, error) {
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var req ocspRequest
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rest, err := asn1.Unmarshal(bytes, &req)
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if err != nil {
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return nil, err
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}
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if len(rest) > 0 {
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return nil, ParseError("trailing data in OCSP request")
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}
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if len(req.TBSRequest.RequestList) == 0 {
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return nil, ParseError("OCSP request contains no request body")
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}
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innerRequest := req.TBSRequest.RequestList[0]
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hashFunc := getHashAlgorithmFromOID(innerRequest.Cert.HashAlgorithm.Algorithm)
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if hashFunc == crypto.Hash(0) {
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return nil, ParseError("OCSP request uses unknown hash function")
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}
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return &Request{
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HashAlgorithm: hashFunc,
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IssuerNameHash: innerRequest.Cert.NameHash,
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IssuerKeyHash: innerRequest.Cert.IssuerKeyHash,
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SerialNumber: innerRequest.Cert.SerialNumber,
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}, nil
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}
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// ParseResponse parses an OCSP response in DER form. It only supports
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// responses for a single certificate. If the response contains a certificate
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// then the signature over the response is checked. If issuer is not nil then
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// it will be used to validate the signature or embedded certificate. Invalid
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// signatures or parse failures will result in a ParseError.
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func ParseResponse(bytes []byte, issuer *x509.Certificate) (*Response, error) {
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var resp responseASN1
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rest, err := asn1.Unmarshal(bytes, &resp)
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if err != nil {
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return nil, err
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}
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if len(rest) > 0 {
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return nil, ParseError("trailing data in OCSP response")
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}
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ret := new(Response)
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if resp.Status != ocspSuccess {
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ret.Status = ServerFailed
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return ret, nil
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}
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if !resp.Response.ResponseType.Equal(idPKIXOCSPBasic) {
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return nil, ParseError("bad OCSP response type")
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}
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var basicResp basicResponse
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rest, err = asn1.Unmarshal(resp.Response.Response, &basicResp)
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if err != nil {
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return nil, err
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}
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if len(basicResp.Certificates) > 1 {
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return nil, ParseError("OCSP response contains bad number of certificates")
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}
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if len(basicResp.TBSResponseData.Responses) != 1 {
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return nil, ParseError("OCSP response contains bad number of responses")
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}
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ret.TBSResponseData = basicResp.TBSResponseData.Raw
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ret.Signature = basicResp.Signature.RightAlign()
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ret.SignatureAlgorithm = getSignatureAlgorithmFromOID(basicResp.SignatureAlgorithm.Algorithm)
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if len(basicResp.Certificates) > 0 {
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ret.Certificate, err = x509.ParseCertificate(basicResp.Certificates[0].FullBytes)
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if err != nil {
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return nil, err
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}
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if err := ret.CheckSignatureFrom(ret.Certificate); err != nil {
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return nil, ParseError("bad OCSP signature")
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}
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if issuer != nil {
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if err := issuer.CheckSignature(ret.Certificate.SignatureAlgorithm, ret.Certificate.RawTBSCertificate, ret.Certificate.Signature); err != nil {
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return nil, ParseError("bad signature on embedded certificate")
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}
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}
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} else if issuer != nil {
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if err := ret.CheckSignatureFrom(issuer); err != nil {
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return nil, ParseError("bad OCSP signature")
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}
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}
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r := basicResp.TBSResponseData.Responses[0]
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ret.SerialNumber = r.CertID.SerialNumber
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switch {
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case bool(r.Good):
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ret.Status = Good
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case bool(r.Unknown):
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ret.Status = Unknown
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default:
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ret.Status = Revoked
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ret.RevokedAt = r.Revoked.RevocationTime
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ret.RevocationReason = r.Revoked.Reason
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}
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ret.ProducedAt = basicResp.TBSResponseData.ProducedAt
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ret.ThisUpdate = r.ThisUpdate
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ret.NextUpdate = r.NextUpdate
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return ret, nil
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}
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// RequestOptions contains options for constructing OCSP requests.
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type RequestOptions struct {
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// Hash contains the hash function that should be used when
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// constructing the OCSP request. If zero, SHA-1 will be used.
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Hash crypto.Hash
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}
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func (opts *RequestOptions) hash() crypto.Hash {
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if opts == nil || opts.Hash == 0 {
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// SHA-1 is nearly universally used in OCSP.
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return crypto.SHA1
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}
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return opts.Hash
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}
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// CreateRequest returns a DER-encoded, OCSP request for the status of cert. If
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// opts is nil then sensible defaults are used.
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func CreateRequest(cert, issuer *x509.Certificate, opts *RequestOptions) ([]byte, error) {
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hashFunc := opts.hash()
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// OCSP seems to be the only place where these raw hash identifiers are
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// used. I took the following from
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// http://msdn.microsoft.com/en-us/library/ff635603.aspx
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var hashOID asn1.ObjectIdentifier
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hashOID, ok := hashOIDs[hashFunc]
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if !ok {
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return nil, x509.ErrUnsupportedAlgorithm
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}
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if !hashFunc.Available() {
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return nil, x509.ErrUnsupportedAlgorithm
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}
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h := opts.hash().New()
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var publicKeyInfo struct {
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Algorithm pkix.AlgorithmIdentifier
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PublicKey asn1.BitString
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}
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if _, err := asn1.Unmarshal(issuer.RawSubjectPublicKeyInfo, &publicKeyInfo); err != nil {
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return nil, err
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}
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h.Write(publicKeyInfo.PublicKey.RightAlign())
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issuerKeyHash := h.Sum(nil)
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h.Reset()
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h.Write(issuer.RawSubject)
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issuerNameHash := h.Sum(nil)
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return asn1.Marshal(ocspRequest{
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tbsRequest{
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Version: 0,
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RequestList: []request{
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{
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Cert: certID{
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pkix.AlgorithmIdentifier{
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Algorithm: hashOID,
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Parameters: asn1.RawValue{Tag: 5 /* ASN.1 NULL */},
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},
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issuerNameHash,
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issuerKeyHash,
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cert.SerialNumber,
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},
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},
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},
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},
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})
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}
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// CreateResponse returns a DER-encoded OCSP response with the specified contents.
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// The fields in the response are populated as follows:
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//
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// The responder cert is used to populate the ResponderName field, and the certificate
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// itself is provided alongside the OCSP response signature.
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//
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// The issuer cert is used to puplate the IssuerNameHash and IssuerKeyHash fields.
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// (SHA-1 is used for the hash function; this is not configurable.)
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//
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// The template is used to populate the SerialNumber, RevocationStatus, RevokedAt,
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// RevocationReason, ThisUpdate, and NextUpdate fields.
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//
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// The ProducedAt date is automatically set to the current date, to the nearest minute.
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func CreateResponse(issuer, responderCert *x509.Certificate, template Response, priv crypto.Signer) ([]byte, error) {
|
|
var publicKeyInfo struct {
|
|
Algorithm pkix.AlgorithmIdentifier
|
|
PublicKey asn1.BitString
|
|
}
|
|
if _, err := asn1.Unmarshal(issuer.RawSubjectPublicKeyInfo, &publicKeyInfo); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
h := sha1.New()
|
|
h.Write(publicKeyInfo.PublicKey.RightAlign())
|
|
issuerKeyHash := h.Sum(nil)
|
|
|
|
h.Reset()
|
|
h.Write(issuer.RawSubject)
|
|
issuerNameHash := h.Sum(nil)
|
|
|
|
innerResponse := singleResponse{
|
|
CertID: certID{
|
|
HashAlgorithm: pkix.AlgorithmIdentifier{
|
|
Algorithm: hashOIDs[crypto.SHA1],
|
|
Parameters: asn1.RawValue{Tag: 5 /* ASN.1 NULL */},
|
|
},
|
|
NameHash: issuerNameHash,
|
|
IssuerKeyHash: issuerKeyHash,
|
|
SerialNumber: template.SerialNumber,
|
|
},
|
|
ThisUpdate: template.ThisUpdate.UTC(),
|
|
NextUpdate: template.NextUpdate.UTC(),
|
|
}
|
|
|
|
switch template.Status {
|
|
case Good:
|
|
innerResponse.Good = true
|
|
case Unknown:
|
|
innerResponse.Unknown = true
|
|
case Revoked:
|
|
innerResponse.Revoked = revokedInfo{
|
|
RevocationTime: template.RevokedAt.UTC(),
|
|
Reason: template.RevocationReason,
|
|
}
|
|
}
|
|
|
|
responderName := asn1.RawValue{
|
|
Class: 2, // context-specific
|
|
Tag: 1, // explicit tag
|
|
IsCompound: true,
|
|
Bytes: responderCert.RawSubject,
|
|
}
|
|
tbsResponseData := responseData{
|
|
Version: 0,
|
|
RawResponderName: responderName,
|
|
ProducedAt: time.Now().Truncate(time.Minute).UTC(),
|
|
Responses: []singleResponse{innerResponse},
|
|
}
|
|
|
|
tbsResponseDataDER, err := asn1.Marshal(tbsResponseData)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
hashFunc, signatureAlgorithm, err := signingParamsForPublicKey(priv.Public(), template.SignatureAlgorithm)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
responseHash := hashFunc.New()
|
|
responseHash.Write(tbsResponseDataDER)
|
|
signature, err := priv.Sign(rand.Reader, responseHash.Sum(nil), hashFunc)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
response := basicResponse{
|
|
TBSResponseData: tbsResponseData,
|
|
SignatureAlgorithm: signatureAlgorithm,
|
|
Signature: asn1.BitString{
|
|
Bytes: signature,
|
|
BitLength: 8 * len(signature),
|
|
},
|
|
}
|
|
if template.Certificate != nil {
|
|
response.Certificates = []asn1.RawValue{
|
|
asn1.RawValue{FullBytes: template.Certificate.Raw},
|
|
}
|
|
}
|
|
responseDER, err := asn1.Marshal(response)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return asn1.Marshal(responseASN1{
|
|
Status: ocspSuccess,
|
|
Response: responseBytes{
|
|
ResponseType: idPKIXOCSPBasic,
|
|
Response: responseDER,
|
|
},
|
|
})
|
|
}
|