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crypto/x509: Parse Extended Key Usage extension 

This changeset makes it possible for crypto/x509 to parse
certificates that include the 'Extended Key Usage' extension
with the critical bit set.

R=agl1
CC=golang-dev
https://golang.org/cl/4277075
This commit is contained in:
Mikkel Krautz 2011-03-29 10:35:34 -04:00 committed by Adam Langley
parent 054516338a
commit a7bb288f99
1 changed files with 77 additions and 0 deletions
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77
src/pkg/crypto/x509/x509.go
View File

@ -304,6 +304,42 @@ const (
KeyUsageDecipherOnly
)
// RFC 5280, 4.2.1.12 Extended Key Usage
//
// anyExtendedKeyUsage OBJECT IDENTIFIER ::= { id-ce-extKeyUsage 0 }
//
// id-kp OBJECT IDENTIFIER ::= { id-pkix 3 }
//
// id-kp-serverAuth OBJECT IDENTIFIER ::= { id-kp 1 }
// id-kp-clientAuth OBJECT IDENTIFIER ::= { id-kp 2 }
// id-kp-codeSigning OBJECT IDENTIFIER ::= { id-kp 3 }
// id-kp-emailProtection OBJECT IDENTIFIER ::= { id-kp 4 }
// id-kp-timeStamping OBJECT IDENTIFIER ::= { id-kp 8 }
// id-kp-OCSPSigning OBJECT IDENTIFIER ::= { id-kp 9 }
var (
oidExtKeyUsageAny = asn1.ObjectIdentifier{2, 5, 29, 37, 0}
oidExtKeyUsageServerAuth = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 1}
oidExtKeyUsageClientAuth = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 2}
oidExtKeyUsageCodeSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 3}
oidExtKeyUsageEmailProtection = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 4}
oidExtKeyUsageTimeStamping = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 8}
oidExtKeyUsageOCSPSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 9}
)
// ExtKeyUsage represents an extended set of actions that are valid for a given key.
// Each of the ExtKeyUsage* constants define a unique action.
type ExtKeyUsage int
const (
ExtKeyUsageAny ExtKeyUsage = iota
ExtKeyUsageServerAuth
ExtKeyUsageClientAuth
ExtKeyUsageCodeSigning
ExtKeyUsageEmailProtection
ExtKeyUsageTimeStamping
ExtKeyUsageOCSPSigning
)
// A Certificate represents an X.509 certificate.
type Certificate struct {
Raw []byte // Raw ASN.1 DER contents.
@ -320,6 +356,9 @@ type Certificate struct {
NotBefore, NotAfter *time.Time // Validity bounds.
KeyUsage KeyUsage
ExtKeyUsage []ExtKeyUsage // Sequence of extended key usages.
UnknownExtKeyUsage []asn1.ObjectIdentifier // Encountered extended key usages unknown to this package.
BasicConstraintsValid bool // if true then the next two fields are valid.
IsCA bool
MaxPathLen int
@ -666,6 +705,44 @@ func parseCertificate(in *certificate) (*Certificate, os.Error) {
out.AuthorityKeyId = a.Id
continue
case 37:
// RFC 5280, 4.2.1.12. Extended Key Usage
// id-ce-extKeyUsage OBJECT IDENTIFIER ::= { id-ce 37 }
//
// ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
//
// KeyPurposeId ::= OBJECT IDENTIFIER
var keyUsage []asn1.ObjectIdentifier
_, err = asn1.Unmarshal(e.Value, &keyUsage)
if err != nil {
return nil, err
}
for _, u := range keyUsage {
switch {
case u.Equal(oidExtKeyUsageAny):
out.ExtKeyUsage = append(out.ExtKeyUsage, ExtKeyUsageAny)
case u.Equal(oidExtKeyUsageServerAuth):
out.ExtKeyUsage = append(out.ExtKeyUsage, ExtKeyUsageServerAuth)
case u.Equal(oidExtKeyUsageClientAuth):
out.ExtKeyUsage = append(out.ExtKeyUsage, ExtKeyUsageClientAuth)
case u.Equal(oidExtKeyUsageCodeSigning):
out.ExtKeyUsage = append(out.ExtKeyUsage, ExtKeyUsageCodeSigning)
case u.Equal(oidExtKeyUsageEmailProtection):
out.ExtKeyUsage = append(out.ExtKeyUsage, ExtKeyUsageEmailProtection)
case u.Equal(oidExtKeyUsageTimeStamping):
out.ExtKeyUsage = append(out.ExtKeyUsage, ExtKeyUsageTimeStamping)
case u.Equal(oidExtKeyUsageOCSPSigning):
out.ExtKeyUsage = append(out.ExtKeyUsage, ExtKeyUsageOCSPSigning)
default:
out.UnknownExtKeyUsage = append(out.UnknownExtKeyUsage, u)
}
}
continue
case 14:
// RFC 5280, 4.2.1.2
var keyid []byte