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