cloudflared-mirror/certutil/certutil.go

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package certutil
import (
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"strings"
)
type namedTunnelToken struct {
ZoneID string `json:"zoneID"`
AccountID string `json:"accountID"`
ServiceKey string `json:"serviceKey"`
}
type OriginCert struct {
PrivateKey interface{}
Cert *x509.Certificate
ZoneID string
ServiceKey string
AccountID string
}
func DecodeOriginCert(blocks []byte) (*OriginCert, error) {
if len(blocks) == 0 {
return nil, fmt.Errorf("Cannot decode empty certificate")
}
originCert := OriginCert{}
block, rest := pem.Decode(blocks)
for {
if block == nil {
break
}
switch block.Type {
case "PRIVATE KEY":
if originCert.PrivateKey != nil {
return nil, fmt.Errorf("Found multiple private key in the certificate")
}
// RSA private key
privateKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("Cannot parse private key")
}
originCert.PrivateKey = privateKey
case "CERTIFICATE":
if originCert.Cert != nil {
return nil, fmt.Errorf("Found multiple certificates in the certificate")
}
cert, err := x509.ParseCertificates(block.Bytes)
if err != nil {
return nil, fmt.Errorf("Cannot parse certificate")
} else if len(cert) > 1 {
return nil, fmt.Errorf("Found multiple certificates in the certificate")
}
originCert.Cert = cert[0]
case "WARP TOKEN", "ARGO TUNNEL TOKEN":
if originCert.ZoneID != "" || originCert.ServiceKey != "" {
return nil, fmt.Errorf("Found multiple tokens in the certificate")
}
// The token is a string,
// Try the newer JSON format
ntt := namedTunnelToken{}
if err := json.Unmarshal(block.Bytes, &ntt); err == nil {
originCert.ZoneID = ntt.ZoneID
originCert.ServiceKey = ntt.ServiceKey
originCert.AccountID = ntt.AccountID
} else {
// Try the older format, where the zoneID and service key are seperated by
// a new line character
token := string(block.Bytes)
s := strings.Split(token, "\n")
if len(s) != 2 {
return nil, fmt.Errorf("Cannot parse token")
}
originCert.ZoneID = s[0]
originCert.ServiceKey = s[1]
}
default:
return nil, fmt.Errorf("Unknown block %s in the certificate", block.Type)
}
block, rest = pem.Decode(rest)
}
if originCert.PrivateKey == nil {
return nil, fmt.Errorf("Missing private key in the certificate")
} else if originCert.Cert == nil {
return nil, fmt.Errorf("Missing certificate in the certificate")
} else if originCert.ZoneID == "" || originCert.ServiceKey == "" {
return nil, fmt.Errorf("Missing token in the certificate")
}
return &originCert, nil
}