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package main
import (
"crypto/x509"
"flag"
"fmt"
"math/big"
"time"
"github.com/gibheer/pki"
)
var (
// the possible valid key usages to check against the commandline
ValidKeyUsages = map[string]x509.KeyUsage{
"digitalsignature": x509.KeyUsageDigitalSignature,
"contentcommitment": x509.KeyUsageContentCommitment,
"keyencipherment": x509.KeyUsageKeyEncipherment,
"dataencipherment": x509.KeyUsageDataEncipherment,
"keyagreement": x509.KeyUsageKeyAgreement,
"certsign": x509.KeyUsageCertSign,
"crlsign": x509.KeyUsageCRLSign,
"encipheronly": x509.KeyUsageEncipherOnly,
"decipheronly": x509.KeyUsageDecipherOnly,
}
// the valid extended key usages, to check against the commandline
ValidExtKeyUsages = map[string]x509.ExtKeyUsage{
"any": x509.ExtKeyUsageAny,
"serverauth": x509.ExtKeyUsageServerAuth,
"clientauth": x509.ExtKeyUsageClientAuth,
"codesigning": x509.ExtKeyUsageCodeSigning,
"emailprotection": x509.ExtKeyUsageEmailProtection,
"ipsecendsystem": x509.ExtKeyUsageIPSECEndSystem,
"ipsectunnel": x509.ExtKeyUsageIPSECTunnel,
"ipsecuser": x509.ExtKeyUsageIPSECUser,
"timestamping": x509.ExtKeyUsageTimeStamping,
"ocspsigning": x509.ExtKeyUsageOCSPSigning,
"microsoftservergatedcrypto": x509.ExtKeyUsageMicrosoftServerGatedCrypto,
"netscapeservergatedcrypto": x509.ExtKeyUsageNetscapeServerGatedCrypto,
}
)
func CreateCert(args []string) error {
var (
flagUsageTemplate string
flagKeyUsage string
flagKeyExtUsage stringList
flagNotBefore string
flagNotAfter string
flagSerial int64
flagLength int
flagIsCA bool
flagCA string
flagPrivate string
flagCSR string
flagOutput string
)
fs := flag.NewFlagSet("pkictl create-cert", flag.ExitOnError)
fs.StringVar(&flagPrivate, "private-key", "", "the private key to generate the request")
fs.StringVar(&flagCSR, "sign-request", "", "the certificate sign request")
fs.StringVar(&flagOutput, "output", "stdout", "path to the output file (default stdout)")
fs.BoolVar(&flagIsCA, "is-ca", false, "is the result a CA - when true ca is ignored")
fs.StringVar(&flagUsageTemplate, "usage", "", "templates for usage (all, server, client)")
fs.StringVar(&flagKeyUsage, "key-usage", "", "comma separated list of key usages")
fs.Var(&flagKeyExtUsage, "key-ext-usage", "comma separated list of further usages")
fs.Int64Var(&flagSerial, "serial", 0, "the serial for the issued certificate")
fs.IntVar(&flagLength, "length", 0, "the number of sub CAs allowed (-1 equals no limit)")
fs.StringVar(&flagCA, "ca", "", "path to the CA certificate")
fs.StringVar(
&flagNotBefore,
"not-before",
time.Now().Format(time.RFC3339),
"time before the certificate is not valid in RFC3339 format (default now)",
)
fs.StringVar(
&flagNotAfter,
"not-after",
time.Now().Format(time.RFC3339),
"time after the certificate is not valid in RFC3339 format (default now)",
)
fs.Parse(args)
if flagPrivate == "" {
return fmt.Errorf("missing private key")
}
if flagCSR == "" {
return fmt.Errorf("missing certificate sign request")
}
out, err := openOutput(flagOutput)
if err != nil {
return err
}
// FIXME check all other out.Close for stdout exception
if flagOutput != "stdout" {
defer out.Close()
}
pk, err := loadPrivateKey(flagPrivate)
if err != nil {
return err
}
csr, err := parseCSR(flagCSR)
if err != nil {
return err
}
var ca *pki.Certificate
if !flagIsCA {
ca, err = parseCA(flagCA)
if err != nil {
return err
}
}
notBefore, err := time.Parse(time.RFC3339, flagNotBefore)
if err != nil {
return err
}
notAfter, err := time.Parse(time.RFC3339, flagNotAfter)
if err != nil {
return err
}
if notBefore.After(notAfter) {
return fmt.Errorf("before and after range is wrong")
}
cert_opts := pki.CertificateOptions{
SerialNumber: big.NewInt(flagSerial),
NotBefore: notBefore,
NotAfter: notAfter,
IsCA: flagIsCA,
CALength: flagLength,
}
if flagKeyUsage != "" {
keyUsage, found := ValidKeyUsages[flagKeyUsage]
if !found {
return fmt.Errorf("unknown key usage")
}
cert_opts.KeyUsage = keyUsage
}
for pos, name := range flagKeyExtUsage {
if val, found := ValidExtKeyUsages[name]; !found {
return fmt.Errorf("%d ext key usage '%s' unknown", pos, name)
} else {
cert_opts.KeyExtendedUsage = append(cert_opts.KeyExtendedUsage, val)
}
}
cert, err := csr.ToCertificate(pk, cert_opts, ca)
if err != nil {
return err
}
return writePem(cert, out)
}
func parseCSR(path string) (*pki.CertificateRequest, error) {
pems_raw, err := openInput(path)
if err != nil {
return nil, err
}
defer pems_raw.Close()
pems, err := parseFile(pems_raw)
if err != nil {
return nil, err
}
csr_raw, err := getSectionFromPem(pems, pki.PemLabelCertificateRequest)
if err != nil {
return nil, err
}
csr, err := pki.LoadCertificateSignRequest(csr_raw)
if err != nil {
return nil, err
}
return csr, nil
}
func parseCA(path string) (*pki.Certificate, error) {
pems_raw, err := openInput(path)
if err != nil {
return nil, err
}
defer pems_raw.Close()
pems, err := parseFile(pems_raw)
if err != nil {
return nil, err
}
ca_raw, err := getSectionFromPem(pems, pki.PemLabelCertificate)
if err != nil {
return nil, err
}
ca, err := pki.LoadCertificate(ca_raw)
if err != nil {
return nil, err
}
return ca, nil
}
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