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package main
import (
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"flag"
"io"
"net"
"os"
"regexp"
)
type (
SignFlags struct {
PrivateKeyPath string // path to the private key
Output string // path where to store the CSR
BaseAttributes pkix.Name
DNSNames []string // alternative names to the BaseAttributes.CommonName
IPAddresses []net.IP // alternative IP addresses
private_key crypto.Signer
output_stream io.Writer // the output stream for the CSR
}
)
var (
COMMA_SPLIT = regexp.MustCompile(`,[[:space:]]?`)
)
// create a sign request with a private key
func create_sign_request() {
flags := parse_sign_flags()
flags.private_key = load_private_key(flags.PrivateKeyPath)
stream, err := open_output_stream(flags.Output)
if err != nil {
crash_with_help(2, fmt.Sprintf("Error when creating file %s: %s", flags.Output, err))
}
defer stream.Close()
flags.output_stream = stream
if err = create_csr(flags); err != nil {
fmt.Fprintln(os.Stderr, "Error when generating CSR: ", err)
os.Exit(3)
}
}
// parse the flags to create a certificate sign request
func parse_sign_flags() SignFlags {
dns_names := "" // string to hold the alternative names
ips := "" // string to hold the alternative ips
flags := SignFlags{}
fs := flag.NewFlagSet("create-cert-sign", flag.ExitOnError)
fs.StringVar(&flags.PrivateKeyPath, "private-key", "", "path to the private key file")
fs.StringVar(&flags.Output, "output", "STDOUT", "path where the generated csr should be stored")
flags.BaseAttributes = pkix.Name{}
fs.StringVar(&flags.BaseAttributes.CommonName, "common-name", "", "the name of the resource")
fs.StringVar(&flags.BaseAttributes.SerialNumber, "serial", "1", "serial number for the request")
fs.StringVar(&dns_names, "names", "", "alternative names (comma separated)")
fs.StringVar(&ips, "ips", "", "alternative IPs (comma separated)")
fs.Parse(os.Args[2:])
// convert array flags to config structs
flags.DNSNames = COMMA_SPLIT.Split(dns_names, -1)
tmp_ips := COMMA_SPLIT.Split(ips, -1)
for _, sip := range tmp_ips {
flags.IPAddresses = append(flags.IPAddresses, net.ParseIP(sip))
}
return flags
}
// generate the csr and print into flags.output_stream
func create_csr(flags SignFlags) (error) {
csr_template := &x509.CertificateRequest{
Subject: flags.BaseAttributes,
DNSNames: flags.DNSNames,
IPAddresses: flags.IPAddresses,
}
csr_raw, err := x509.CreateCertificateRequest(rand.Reader, csr_template, flags.private_key)
if err != nil { return err }
block := &pem.Block{Type: TypeLabelCSR, Bytes: csr_raw}
pem.Encode(flags.output_stream, block)
return nil
}
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