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ca.go
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ca.go
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package webca
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"io/ioutil"
"log"
"math/big"
"os"
"strings"
"time"
)
const (
CERT_SUFFIX = ".pem"
KEY_SUFFIX = ".key.pem"
SECS_IN_DAY = 24 * 60 * 60
)
type Cert struct {
Crt *x509.Certificate
Key *rsa.PrivateKey
Parent *Cert // parent (CA) cert if any
}
type CertTree struct {
Certs map[string]*Cert // Name to cert mapper
CAkids map[string][]*Cert // CA to cert list
Order []*Cert // Ordered list of certs
}
func GenCACert(name pkix.Name, days int) (*Cert, error) {
return genCert(nil, name, days)
}
func GenCert(parent *Cert, cert string, days int) (*Cert, error) {
name := copyName(parent.Crt.Subject)
name.CommonName = cert
return genCert(parent, name, days)
}
func RenewCert(cert *Cert) (*Cert, error) {
days := int((cert.Crt.NotAfter.Unix() - cert.Crt.NotBefore.Unix()) / SECS_IN_DAY)
return genCert(cert.Parent, cert.Crt.Subject, days)
}
func copyName(name pkix.Name) pkix.Name {
return pkix.Name{CommonName: name.CommonName,
StreetAddress: name.StreetAddress,
PostalCode: name.PostalCode,
Locality: name.Locality,
Province: name.Province,
OrganizationalUnit: name.OrganizationalUnit,
Organization: name.Organization,
Country: name.Country,
}
}
func prepareName(name *pkix.Name) {
if name.Country == nil {
name.StreetAddress = []string{""}
name.PostalCode = []string{""}
name.Province = []string{""}
name.Locality = []string{""}
name.OrganizationalUnit = []string{""}
name.Organization = []string{""}
name.Country = []string{""}
}
}
func genCert(p *Cert, name pkix.Name, days int) (*Cert, error) {
t := &Cert{}
key, err := rsa.GenerateKey(rand.Reader, 1024)
if err != nil {
return nil, fmt.Errorf("Failed to generate private key: %s", err)
}
now := time.Now()
serial, err := rand.Int(rand.Reader, new(big.Int).SetInt64(9223372036854775807))
ski := []byte{0, 0, 0, 0}
rand.Reader.Read(ski)
if err != nil {
return nil, fmt.Errorf("Failed to generate random serial number: %s", err)
}
//log.Println("serial:", serial)
//log.Println("ski:", ski)
t.Crt = &x509.Certificate{
SerialNumber: serial,
Subject: name,
NotBefore: now.Add(-5 * time.Minute).UTC(),
NotAfter: now.AddDate(0, 0, days).UTC(), // valid for days
SubjectKeyId: ski,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
}
t.Key = key
if p == nil {
t.Crt.BasicConstraintsValid = true
t.Crt.IsCA = true
t.Crt.MaxPathLen = 0
t.Crt.KeyUsage = t.Crt.KeyUsage | x509.KeyUsageCertSign
p = t
//log.Println("t.Key.PublicKey=", t.Key.PublicKey)
//log.Println("p.Key=", t.Key)
} else {
t.Parent = p
}
certname := name.CommonName + CERT_SUFFIX
keyname := name.CommonName + KEY_SUFFIX
derBytes, err := x509.CreateCertificate(rand.Reader, t.Crt, p.Crt, &t.Key.PublicKey, p.Key)
//log.Println("Generated:", tmpl)
if err != nil {
return nil, fmt.Errorf("Failed to create Certificate: %s", err)
}
certOut, err := os.Create(certname)
if err != nil {
return nil, fmt.Errorf("Failed to open "+certname+" for writing: %s", err)
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
certOut.Close()
//log.Print("Written " + certname + "\n")
keyOut, err := os.OpenFile(keyname, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return nil, fmt.Errorf("Failed to open "+keyname+" for writing: %s", err)
}
pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(t.Key)})
keyOut.Close()
//log.Print("Written " + keyname + "\n")
return t, nil
}
func loadCert(name string) (*Cert, error) {
cert := Cert{}
kname := name
if strings.HasSuffix(kname, CERT_SUFFIX) {
kname = kname[:len(kname)-len(CERT_SUFFIX)]
}
if !strings.HasSuffix(kname, KEY_SUFFIX) {
kname = kname + KEY_SUFFIX
}
if !strings.HasSuffix(name, CERT_SUFFIX) {
name = name + CERT_SUFFIX
}
certIn, err := ioutil.ReadFile(name)
if err != nil {
return nil, fmt.Errorf("Failed to open "+name+" for reading: %s", err)
}
b, _ := pem.Decode(certIn)
if b == nil {
return nil, fmt.Errorf("Failed to find a certificate in " + name)
}
cert.Crt, err = x509.ParseCertificate(b.Bytes)
if err != nil {
return nil, fmt.Errorf("Failed to parse certificate " + name)
}
keyIn, err := ioutil.ReadFile(kname)
if err != nil {
return nil, fmt.Errorf("Failed to open "+kname+" for reading: %s", err)
}
kb, _ := pem.Decode(keyIn)
if kb == nil {
return nil, fmt.Errorf("Failed to find a key in " + kname)
}
cert.Key, err = x509.ParsePKCS1PrivateKey(kb.Bytes)
if err != nil {
return nil, fmt.Errorf("Failed to parse key " + kname)
}
return &cert, nil
}
func LoadCertTree(dir string) *CertTree {
ctree := newCertTree()
fi, err := os.Lstat(dir)
if err != nil {
log.Printf("(Warning) Failed to check path "+dir+":", err)
return nil
}
if !fi.IsDir() {
log.Printf("(Warning) Path " + dir + " is not a directory!")
return nil
}
f, err := os.Open(dir)
if err != nil {
log.Printf("(Warning) Can't open "+dir+" for reading:", err)
return nil
}
defer f.Close()
for fis, err := f.Readdir(100); err == nil; fis, err = f.Readdir(100) {
for _, fi := range fis {
if !fi.IsDir() && strings.HasSuffix(fi.Name(), CERT_SUFFIX) &&
!strings.HasSuffix(fi.Name(), KEY_SUFFIX) {
if crt, err := loadCert(fi.Name()); err == nil {
ctree.addCert(crt)
} else {
log.Printf("(Warning) %s", err)
}
}
}
}
if err != nil {
log.Printf("(Warning) Can't read dir "+dir+":", err)
return nil
}
if len(ctree.Certs) == 0 {
return nil
}
return ctree
}
func newCertTree() *CertTree {
return &CertTree{make(map[string]*Cert, 0), make(map[string][]*Cert, 0), make([]*Cert, 0)}
}
func (ct *CertTree) insertCert(cert *Cert) {
ct.Certs[cert.Crt.Subject.CommonName] = cert
ct.Order = append(ct.Order, cert)
if cert.Crt.IsCA {
kids := ct.CAkids[cert.Crt.Subject.CommonName]
if kids == nil {
kids = make([]*Cert, 0)
ct.CAkids[cert.Crt.Subject.CommonName] = kids
} else {
for _, kidcrt := range kids {
kidcrt.Parent = cert
}
}
} else {
kids := ct.CAkids[cert.Crt.Issuer.CommonName]
if kids == nil {
kids = []*Cert{cert}
ct.CAkids[cert.Crt.Issuer.CommonName] = kids
} else {
ct.CAkids[cert.Crt.Issuer.CommonName] = append(kids, cert)
}
cacert := ct.Certs[cert.Crt.Issuer.CommonName]
if cacert != nil {
cert.Parent = cacert
}
}
}
func (ct *CertTree) addCert(cert *Cert) {
prev := ct.Certs[cert.Crt.Subject.CommonName]
if prev == nil {
ct.insertCert(cert)
return
}
if cert.Crt != nil {
prev.Crt = cert.Crt
}
if cert.Parent != nil {
prev.Parent = cert.Parent
}
if cert.Key != nil {
prev.Key = cert.Key
}
}
func (ct *CertTree) String() string {
s := "CertTree:\n"
for ca, kids := range ct.CAkids {
s += ct.Certs[ca].String() + "\n"
for _, crt := range kids {
s += " " + crt.String() + "\n"
}
}
return s
}
func (cert *Cert) String() string {
prefix := ""
if cert.Crt.IsCA {
prefix = "(CA)"
}
return prefix + " " + cert.Crt.Subject.CommonName +
" (" + cert.Crt.NotBefore.String() + " - " + cert.Crt.NotAfter.String() + ")"
}
func handleFatal(err error) {
if err != nil {
log.Fatalf(err.Error())
}
}
/*
func main() {
certTree := LoadCertTree(".")
if certTree == nil {
certTree = newCertTree()
ca, err := GenCACert(pkix.Name{CommonName: "TestCA",
StreetAddress: []string{"Acme st. num. 23"},
PostalCode: []string{"12345"},
Locality: []string{"Acme City"},
Province: []string{"Acme County"},
OrganizationalUnit: []string{"Acme Labs"},
Organization: []string{"Acme"},
Country: []string{"AcmeLand"}}, 1095)
handleFatal(err)
certTree.addCert(ca)
for _, crtName := range []string{"server.acme.com", "tys14ubu.rfranco.com"} {
crt, err := GenCert(ca, crtName, 365)
handleFatal(err)
certTree.addCert(crt)
}
}
log.Print(certTree)
//log.Print("CertTree.first:\n", certTree.first)
//RenewCert(nil, certTree.first.ca)
//RenewCert(certTree.first.ca, certTree.first.Certs[0])
//certTree = LoadCertTree(".")
//log.Print("Renewed CertTree:\n", certTree)
}*/