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names.go
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names.go
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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package x509tools
import (
"crypto/x509"
"encoding/asn1"
"encoding/binary"
"fmt"
"strings"
"unicode/utf16"
)
type rdnAttr struct {
Type asn1.ObjectIdentifier
Value asn1.RawValue
}
type rdnNameSet []rdnAttr
type NameStyle int
const (
NameStyleOpenSsl NameStyle = iota
NameStyleLdap
NameStyleMsOsco
)
type attrName struct {
Type asn1.ObjectIdentifier
Name string
}
var nameStyleLdap = []attrName{
attrName{asn1.ObjectIdentifier{2, 5, 4, 3}, "CN"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 4}, "surname"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 5}, "serialNumber"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 6}, "C"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 7}, "L"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 8}, "ST"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 9}, "street"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 10}, "O"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 11}, "OU"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 12}, "title"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 13}, "description"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 17}, "postalCode"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 18}, "postOfficeBox"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 20}, "telephoneNumber"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 42}, "givenName"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 43}, "initials"},
attrName{asn1.ObjectIdentifier{0, 9, 2342, 19200300, 100, 1, 25}, "dc"},
attrName{asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 1}, "emailAddress"},
}
// Per [MS-OSCO]
// https://msdn.microsoft.com/en-us/library/dd947276(v=office.12).aspx
var nameStyleMsOsco = []attrName{
attrName{asn1.ObjectIdentifier{2, 5, 4, 3}, "CN"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 7}, "L"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 10}, "O"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 11}, "OU"},
attrName{asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 9, 1}, "E"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 6}, "C"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 8}, "S"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 9}, "STREET"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 12}, "T"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 42}, "G"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 43}, "I"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 4}, "SN"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 5}, "SERIALNUMBER"},
attrName{asn1.ObjectIdentifier{0, 9, 2342, 19200300, 100, 1, 25}, "DC"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 13}, "Description"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 17}, "PostalCode"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 18}, "POBox"},
attrName{asn1.ObjectIdentifier{2, 5, 4, 20}, "Phone"},
}
// returned by the Format* functions in case there's something cripplingly
// wrong with it
const InvalidName = "<invalid>"
// Format the name (RDN sequence) from its raw DER to a readable style.
func FormatPkixName(der []byte, style NameStyle) string {
var seq asn1.RawValue
if _, err := asn1.Unmarshal(der, &seq); err != nil {
return InvalidName
}
seqbytes := seq.Bytes
var formatted []string
for len(seqbytes) > 0 {
var rdnSet rdnNameSet
var err error
seqbytes, err = asn1.UnmarshalWithParams(seqbytes, &rdnSet, "set")
if err != nil {
return InvalidName
}
for _, attr := range rdnSet {
formatted = append(formatted, fmt.Sprintf("%s=%s", attName(attr.Type, style), attValue(attr.Value, style)))
}
}
if len(formatted) == 0 {
return ""
}
switch style {
case NameStyleOpenSsl:
return "/" + strings.Join(formatted, "/") + "/"
case NameStyleLdap, NameStyleMsOsco:
// Per RFC 2253 2.1, reverse the order
for i := 0; i < len(formatted)/2; i++ {
j := len(formatted) - i - 1
formatted[i], formatted[j] = formatted[j], formatted[i]
}
return strings.Join(formatted, ", ")
default:
panic("invalid style argument")
}
}
func attName(t asn1.ObjectIdentifier, style NameStyle) string {
var names []attrName
var defaultPrefix string
switch style {
case NameStyleLdap, NameStyleOpenSsl:
names = nameStyleLdap
case NameStyleMsOsco:
names = nameStyleMsOsco
defaultPrefix = "OID."
default:
panic("invalid style argument")
}
for _, name := range names {
if name.Type.Equal(t) {
return name.Name
}
}
return defaultPrefix + t.String()
}
func attValue(raw asn1.RawValue, style NameStyle) string {
var value string
switch raw.Tag {
case asn1.TagUTF8String, asn1.TagIA5String, asn1.TagPrintableString:
var ret interface{}
if _, err := asn1.Unmarshal(raw.FullBytes, &ret); err != nil {
return InvalidName
}
value = ret.(string)
case Asn1TagBMPString:
value = ParseBMPString(raw)
default:
return InvalidName
}
switch style {
case NameStyleOpenSsl:
value = strings.Replace(value, "/", "\\/", -1)
case NameStyleLdap, NameStyleMsOsco:
quote := false
if len(value) == 0 {
quote = true
}
if strings.HasPrefix(value, " ") || strings.HasSuffix(value, " ") {
quote = true
}
if i := strings.IndexAny(value, ",+=\n<>#;'\""); i >= 0 {
quote = true
}
value = strings.Replace(value, "\"", "\"\"", -1)
if quote {
value = "\"" + value + "\""
}
}
return value
}
func ParseBMPString(raw asn1.RawValue) string {
runes := make([]uint16, len(raw.Bytes)/2)
for i := range runes {
runes[i] = binary.BigEndian.Uint16(raw.Bytes[i*2:])
}
return string(utf16.Decode(runes))
}
func ToBMPString(value string) asn1.RawValue {
runes := utf16.Encode([]rune(value))
raw := make([]byte, 2*len(runes))
for i, r := range runes {
binary.BigEndian.PutUint16(raw[i*2:], r)
}
return asn1.RawValue{Tag: Asn1TagBMPString, Bytes: raw}
}
// Format the certificate subject name in LDAP style
func FormatSubject(cert *x509.Certificate) string {
return FormatPkixName(cert.RawSubject, NameStyleLdap)
}
// Format the certificate issuer name in LDAP style
func FormatIssuer(cert *x509.Certificate) string {
return FormatPkixName(cert.RawIssuer, NameStyleLdap)
}