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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| package cert | ||
|
|
||
| import ( | ||
| "crypto/x509/pkix" | ||
| "encoding/asn1" | ||
| "fmt" | ||
| "strings" | ||
| ) | ||
|
|
||
| type Extension struct { | ||
| Name string | ||
| Critical bool | ||
| Value string | ||
| } | ||
|
|
||
| func ToExtensions(in []pkix.Extension) []Extension { | ||
|
|
||
| var out []Extension | ||
| for _, v := range in { | ||
| name, value := parseExtension(v) | ||
| out = append(out, Extension{ | ||
| Name: name, | ||
| Critical: v.Critical, | ||
| Value: value, | ||
| }) | ||
| } | ||
| return out | ||
| } | ||
|
|
||
| func parseExtension(in pkix.Extension) (string, string) { | ||
| if fn, ok := extensionsByOid[in.Id.String()]; ok { | ||
| return fn(in.Value) | ||
| } | ||
| return in.Id.String(), "-" | ||
| } | ||
|
|
||
| var extensionsByOid = map[string]func(in []byte) (string, string){ | ||
| //"2.5.29.35": parseAuthorityKeyIdentifier, | ||
| "2.5.29.14": parseSubjectKeyIdentifier, | ||
| "2.5.29.15": parseKeyUsage, | ||
| //"2.5.29.32": parseCertificatePolicies, | ||
| //"2.5.29.": parsePolicyMappings, | ||
| //"2.5.29.": parseSubjectAlternativeName, | ||
| //"2.5.29.": parseIssuerAlternativeName, | ||
| //"2.5.29.": parseSubjectDirectoryAttributes, | ||
| "2.5.29.19": parseBasicConstraints, | ||
| //"2.5.29.": parseNameConstraints, | ||
| //"2.5.29.": parsePolicyConstraints, | ||
| //"2.5.29.": parseExtendedKeyUsage, | ||
| //"2.5.29.": parseCRLDistributionPoints, | ||
| //"2.5.29.": parseInhibitAnyPolicy, | ||
| //"2.5.29.": parseFreshestCRL, | ||
| // private internet extensions | ||
| //"": parseAuthorityInformationAccess, | ||
| //"": parseSubjectInformationAccess, | ||
| } | ||
|
|
||
| func parseSubjectKeyIdentifier(in []byte) (string, string) { | ||
| name := "Subject Key Identifier" | ||
| out := asn1.RawValue{Tag: asn1.TagOctetString} | ||
| if _, err := asn1.Unmarshal(in, &out); err != nil { | ||
| return name, err.Error() | ||
| } | ||
| return name, formatHexArray(out.Bytes) | ||
| } | ||
|
|
||
| func parseKeyUsage(in []byte) (string, string) { | ||
| name := "Key Usage" | ||
| var out asn1.BitString | ||
| if _, err := asn1.Unmarshal(in, &out); err != nil { | ||
| return name, err.Error() | ||
| } | ||
| return name, strings.Join(toKeyUsage(out), ", ") | ||
| } | ||
|
|
||
| func parseBasicConstraints(in []byte) (string, string) { | ||
| name := "Basic Constraints" | ||
| out := struct { | ||
| CA bool `asn1:"optional"` | ||
| PathLenConstraint int `asn1:"optional"` | ||
| }{} | ||
|
|
||
| if _, err := asn1.Unmarshal(in, &out); err != nil { | ||
| return name, err.Error() | ||
| } | ||
|
|
||
| fields := []string{fmt.Sprintf("CA: %t", out.CA)} | ||
| if out.PathLenConstraint != 0 { | ||
| fields = append(fields, fmt.Sprintf("PathLenConstraint: %d", out.PathLenConstraint)) | ||
| } | ||
| return name, strings.Join(fields, ", ") | ||
| } | ||
|
|
||
| // order is important! | ||
| var keyUsage = []string{ | ||
| "Digital Signature", | ||
| "Content Commitment", // renamed from non repudiation | ||
| "Key Encipherment", | ||
| "Data Encipherment", | ||
| "Key Agreement", | ||
| "Key Cert Sign", | ||
| "CRLs Sign", | ||
| "Encipher Only", | ||
| "Decipher Only", | ||
| } | ||
|
|
||
| func toKeyUsage(in asn1.BitString) []string { | ||
| var out []string | ||
| for i, v := range keyUsage { | ||
| if in.At(i) != 0 { | ||
| out = append(out, v) | ||
| } | ||
| } | ||
| return out | ||
| } |