// Copyright 2011 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Package pkix contains shared, low level structures used for ASN.1 parsing // and serialization of X.509 certificates, CRL and OCSP. package pkix import ( "encoding/asn1" "math/big" "time" ) // AlgorithmIdentifier represents the ASN.1 structure of the same name. See RFC // 5280, section 4.1.1.2. type AlgorithmIdentifier struct { Algorithm asn1.ObjectIdentifier Parameters asn1.RawValue `asn1:"optional"` } type RDNSequence []RelativeDistinguishedNameSET type RelativeDistinguishedNameSET []AttributeTypeAndValue // AttributeTypeAndValue mirrors the ASN.1 structure of the same name in // http://tools.ietf.org/html/rfc5280#section-4.1.2.4 type AttributeTypeAndValue struct { Type asn1.ObjectIdentifier Value interface{} } // AttributeTypeAndValueSET represents a set of ASN.1 sequences of // AttributeTypeAndValue sequences from RFC 2986 (PKCS #10). type AttributeTypeAndValueSET struct { Type asn1.ObjectIdentifier Value [][]AttributeTypeAndValue `asn1:"set"` } // Extension represents the ASN.1 structure of the same name. See RFC // 5280, section 4.2. type Extension struct { Id asn1.ObjectIdentifier Critical bool `asn1:"optional"` Value []byte } // Name represents an X.509 distinguished name. This only includes the common // elements of a DN. When parsing, all elements are stored in Names and // non-standard elements can be extracted from there. When marshaling, elements // in ExtraNames are appended and override other values with the same OID. type Name struct { Country, Organization, OrganizationalUnit []string Locality, Province []string StreetAddress, PostalCode []string SerialNumber, CommonName string Names []AttributeTypeAndValue ExtraNames []AttributeTypeAndValue } func (n *Name) FillFromRDNSequence(rdns *RDNSequence) { for _, rdn := range *rdns { if len(rdn) == 0 { continue } for _, atv := range rdn { n.Names = append(n.Names, atv) value, ok := atv.Value.(string) if !ok { continue } t := atv.Type if len(t) == 4 && t[0] == 2 && t[1] == 5 && t[2] == 4 { switch t[3] { case 3: n.CommonName = value case 5: n.SerialNumber = value case 6: n.Country = append(n.Country, value) case 7: n.Locality = append(n.Locality, value) case 8: n.Province = append(n.Province, value) case 9: n.StreetAddress = append(n.StreetAddress, value) case 10: n.Organization = append(n.Organization, value) case 11: n.OrganizationalUnit = append(n.OrganizationalUnit, value) case 17: n.PostalCode = append(n.PostalCode, value) } } } } } var ( oidCountry = []int{2, 5, 4, 6} oidOrganization = []int{2, 5, 4, 10} oidOrganizationalUnit = []int{2, 5, 4, 11} oidCommonName = []int{2, 5, 4, 3} oidSerialNumber = []int{2, 5, 4, 5} oidLocality = []int{2, 5, 4, 7} oidProvince = []int{2, 5, 4, 8} oidStreetAddress = []int{2, 5, 4, 9} oidPostalCode = []int{2, 5, 4, 17} ) // appendRDNs appends a relativeDistinguishedNameSET to the given RDNSequence // and returns the new value. The relativeDistinguishedNameSET contains an // attributeTypeAndValue for each of the given values. See RFC 5280, A.1, and // search for AttributeTypeAndValue. func (n Name) appendRDNs(in RDNSequence, values []string, oid asn1.ObjectIdentifier) RDNSequence { if len(values) == 0 || oidInAttributeTypeAndValue(oid, n.ExtraNames) { return in } s := make([]AttributeTypeAndValue, len(values)) for i, value := range values { s[i].Type = oid s[i].Value = value } return append(in, s) } func (n Name) ToRDNSequence() (ret RDNSequence) { ret = n.appendRDNs(ret, n.Country, oidCountry) ret = n.appendRDNs(ret, n.Province, oidProvince) ret = n.appendRDNs(ret, n.Locality, oidLocality) ret = n.appendRDNs(ret, n.StreetAddress, oidStreetAddress) ret = n.appendRDNs(ret, n.PostalCode, oidPostalCode) ret = n.appendRDNs(ret, n.Organization, oidOrganization) ret = n.appendRDNs(ret, n.OrganizationalUnit, oidOrganizationalUnit) if len(n.CommonName) > 0 { ret = n.appendRDNs(ret, []string{n.CommonName}, oidCommonName) } if len(n.SerialNumber) > 0 { ret = n.appendRDNs(ret, []string{n.SerialNumber}, oidSerialNumber) } for _, atv := range n.ExtraNames { ret = append(ret, []AttributeTypeAndValue{atv}) } return ret } // oidInAttributeTypeAndValue returns whether a type with the given OID exists // in atv. func oidInAttributeTypeAndValue(oid asn1.ObjectIdentifier, atv []AttributeTypeAndValue) bool { for _, a := range atv { if a.Type.Equal(oid) { return true } } return false } // CertificateList represents the ASN.1 structure of the same name. See RFC // 5280, section 5.1. Use Certificate.CheckCRLSignature to verify the // signature. type CertificateList struct { TBSCertList TBSCertificateList SignatureAlgorithm AlgorithmIdentifier SignatureValue asn1.BitString } // HasExpired reports whether now is past the expiry time of certList. func (certList *CertificateList) HasExpired(now time.Time) bool { return now.After(certList.TBSCertList.NextUpdate) } // TBSCertificateList represents the ASN.1 structure of the same name. See RFC // 5280, section 5.1. type TBSCertificateList struct { Raw asn1.RawContent Version int `asn1:"optional,default:0"` Signature AlgorithmIdentifier Issuer RDNSequence ThisUpdate time.Time NextUpdate time.Time `asn1:"optional"` RevokedCertificates []RevokedCertificate `asn1:"optional"` Extensions []Extension `asn1:"tag:0,optional,explicit"` } // RevokedCertificate represents the ASN.1 structure of the same name. See RFC // 5280, section 5.1. type RevokedCertificate struct { SerialNumber *big.Int RevocationTime time.Time Extensions []Extension `asn1:"optional"` }