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// 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"
"encoding/hex"
"fmt"
"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
var attributeTypeNames = map[string]string{
"2.5.4.6": "C",
"2.5.4.10": "O",
"2.5.4.11": "OU",
"2.5.4.3": "CN",
"2.5.4.5": "SERIALNUMBER",
"2.5.4.7": "L",
"2.5.4.8": "ST",
"2.5.4.9": "STREET",
"2.5.4.17": "POSTALCODE",
}
// String returns a string representation of the sequence r,
// roughly following the RFC 2253 Distinguished Names syntax.
func (r RDNSequence) String() string {
s := ""
for i := 0; i < len(r); i++ {
rdn := r[len(r)-1-i]
if i > 0 {
s += ","
}
for j, tv := range rdn {
if j > 0 {
s += "+"
}
oidString := tv.Type.String()
typeName, ok := attributeTypeNames[oidString]
if !ok {
derBytes, err := asn1.Marshal(tv.Value)
if err == nil {
s += oidString + "=#" + hex.EncodeToString(derBytes)
continue // No value escaping necessary.
}
typeName = oidString
}
valueString := fmt.Sprint(tv.Value)
escaped := make([]rune, 0, len(valueString))
for k, c := range valueString {
escape := false
switch c {
case ',', '+', '"', '\\', '<', '>', ';':
escape = true
case ' ':
escape = k == 0 || k == len(valueString)-1
case '#':
escape = k == 0
}
if escape {
escaped = append(escaped, '\\', c)
} else {
escaped = append(escaped, c)
}
}
s += typeName + "=" + string(escaped)
}
}
return s
}
type RelativeDistinguishedNameSET []AttributeTypeAndValue
// AttributeTypeAndValue mirrors the ASN.1 structure of the same name in
// RFC 5280, 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
}
// String returns the string form of n, roughly following
// the RFC 2253 Distinguished Names syntax.
func (n Name) String() string {
return n.ToRDNSequence().String()
}
// oidInAttributeTypeAndValue reports 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 certList should have been updated by now.
func (certList *CertificateList) HasExpired(now time.Time) bool {
return !now.Before(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"`
}