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package goproxy
import (
"crypto/rsa"
"crypto/sha1"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"math/big"
"net"
"runtime"
"sort"
"time"
)
func hashSorted(lst []string) []byte {
c := make([]string, len(lst))
copy(c, lst)
sort.Strings(c)
h := sha1.New()
for _, s := range c {
h.Write([]byte(s + ","))
}
return h.Sum(nil)
}
func hashSortedBigInt(lst []string) *big.Int {
rv := new(big.Int)
rv.SetBytes(hashSorted(lst))
return rv
}
var goproxySignerVersion = ":goroxy1"
func signHost(ca tls.Certificate, hosts []string) (cert tls.Certificate, err error) {
var x509ca *x509.Certificate
if x509ca, err = x509.ParseCertificate(GoproxyCa.Certificate[0]); err != nil {
return
}
start := time.Unix(0, 0)
end, err := time.Parse("2006-01-02", "2049-12-31")
if err != nil {
panic(err)
}
hash := hashSorted(append(hosts, goproxySignerVersion, ":"+runtime.Version()))
serial := new(big.Int)
serial.SetBytes(hash)
template := x509.Certificate{
// TODO(elazar): instead of this ugly hack, just encode the certificate and hash the binary form.
SerialNumber: serial,
Issuer: x509ca.Subject,
Subject: pkix.Name{
Organization: []string{"GoProxy untrusted MITM proxy Inc"},
},
NotBefore: start,
NotAfter: end,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
var csprng CounterEncryptorRand
if csprng, err = NewCounterEncryptorRandFromKey(ca.PrivateKey, hash); err != nil {
return
}
var certpriv *rsa.PrivateKey
if certpriv, err = rsa.GenerateKey(&csprng, 1024); err != nil {
return
}
var derBytes []byte
if derBytes, err = x509.CreateCertificate(&csprng, &template, x509ca, &certpriv.PublicKey, ca.PrivateKey); err != nil {
return
}
return tls.Certificate{
Certificate: [][]byte{derBytes, ca.Certificate[0]},
PrivateKey: certpriv,
}, nil
}
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