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util.go
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util.go
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package main
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"net"
"os"
"strings"
cferr "github.com/cloudflare/cfssl/errors"
"github.com/kr/text"
)
// following two lifted from CFSSL, (replace-regexp "\(.+\): \(.+\),"
// "\2: \1,")
var keyUsage = map[x509.KeyUsage]string{
x509.KeyUsageDigitalSignature: "digital signature",
x509.KeyUsageContentCommitment: "content committment",
x509.KeyUsageKeyEncipherment: "key encipherment",
x509.KeyUsageKeyAgreement: "key agreement",
x509.KeyUsageDataEncipherment: "data encipherment",
x509.KeyUsageCertSign: "cert sign",
x509.KeyUsageCRLSign: "crl sign",
x509.KeyUsageEncipherOnly: "encipher only",
x509.KeyUsageDecipherOnly: "decipher only",
}
var extKeyUsages = map[x509.ExtKeyUsage]string{
x509.ExtKeyUsageAny: "any",
x509.ExtKeyUsageServerAuth: "server auth",
x509.ExtKeyUsageClientAuth: "client auth",
x509.ExtKeyUsageCodeSigning: "code signing",
x509.ExtKeyUsageEmailProtection: "s/mime",
x509.ExtKeyUsageIPSECEndSystem: "ipsec end system",
x509.ExtKeyUsageIPSECTunnel: "ipsec tunnel",
x509.ExtKeyUsageIPSECUser: "ipsec user",
x509.ExtKeyUsageTimeStamping: "timestamping",
x509.ExtKeyUsageOCSPSigning: "ocsp signing",
x509.ExtKeyUsageMicrosoftServerGatedCrypto: "microsoft sgc",
x509.ExtKeyUsageNetscapeServerGatedCrypto: "netscape sgc",
}
func pubKeyAlgo(a x509.PublicKeyAlgorithm) string {
switch a {
case x509.RSA:
return "RSA"
case x509.ECDSA:
return "ECDSA"
case x509.DSA:
return "DSA"
default:
return "unknown public key algorithm"
}
}
func sigAlgoPK(a x509.SignatureAlgorithm) string {
switch a {
case x509.MD2WithRSA, x509.MD5WithRSA, x509.SHA1WithRSA, x509.SHA256WithRSA, x509.SHA384WithRSA, x509.SHA512WithRSA:
return "RSA"
case x509.ECDSAWithSHA1, x509.ECDSAWithSHA256, x509.ECDSAWithSHA384, x509.ECDSAWithSHA512:
return "ECDSA"
case x509.DSAWithSHA1, x509.DSAWithSHA256:
return "DSA"
default:
return "unknown public key algorithm"
}
}
func sigAlgoHash(a x509.SignatureAlgorithm) string {
switch a {
case x509.MD2WithRSA:
return "MD2"
case x509.MD5WithRSA:
return "MD5"
case x509.SHA1WithRSA, x509.ECDSAWithSHA1, x509.DSAWithSHA1:
return "SHA1"
case x509.SHA256WithRSA, x509.ECDSAWithSHA256, x509.DSAWithSHA256:
return "SHA256"
case x509.SHA384WithRSA, x509.ECDSAWithSHA384:
return "SHA384"
case x509.SHA512WithRSA, x509.ECDSAWithSHA512:
return "SHA512"
default:
return "unknown hash algorithm"
}
}
// TranslateCFSSLError turns a CFSSL error into a more readable string.
func TranslateCFSSLError(err error) error {
if err == nil {
return nil
}
// printing errors as json is terrible
if cfsslError, ok := err.(*cferr.Error); ok {
err = errors.New(cfsslError.Message)
}
return err
}
// Warnx displays a formatted error message to standard error, à la
// warnx(3).
func Warnx(format string, a ...interface{}) (int, error) {
format += "\n"
return fmt.Fprintf(os.Stderr, format, a...)
}
// Warn displays a formatted error message to standard output,
// appending the error string, à la warn(3).
func Warn(err error, format string, a ...interface{}) (int, error) {
format += ": %v\n"
a = append(a, err)
return fmt.Fprintf(os.Stderr, format, a...)
}
const maxLine = 78
func makeIndent(n int) string {
s := " "
for i := 0; i < n; i++ {
s += " "
}
return s
}
func indentLen(n int) int {
return 4 + (8 * n)
}
// this isn't real efficient, but that's not a problem here
func wrap(s string, indent int) string {
if indent > 3 {
indent = 3
}
wrapped := text.Wrap(s, maxLine)
lines := strings.SplitN(wrapped, "\n", 2)
if len(lines) == 1 {
return lines[0]
}
if (maxLine - indentLen(indent)) <= 0 {
panic("too much indentation")
}
rest := strings.Join(lines[1:], " ")
wrapped = text.Wrap(rest, maxLine-indentLen(indent))
return lines[0] + "\n" + text.Indent(wrapped, makeIndent(indent))
}
func dumpHex(in []byte) string {
var s string
for i := range in {
s += fmt.Sprintf("%02X:", in[i])
}
return strings.Trim(s, ":")
}
// permissiveConfig returns a maximally-accepting TLS configuration;
// the purpose is to look at the cert, not verify the security properties
// of the connection.
func permissiveConfig() *tls.Config {
return &tls.Config{
InsecureSkipVerify: true,
}
}
// verifyConfig returns a config that will verify the connection.
func verifyConfig(hostname string) *tls.Config {
return &tls.Config{
ServerName: hostname,
}
}
type connInfo struct {
// The original URI provided.
URI string
// The hostname of the server.
Host string
// The port to connect on.
Port string
// The address to connect to.
Addr string
}
func getConnInfo(uri string) *connInfo {
ci := &connInfo{URI: uri}
ci.Host = uri[len("https://"):]
host, port, err := net.SplitHostPort(ci.Host)
if err != nil {
ci.Port = "443"
} else {
ci.Host = host
ci.Port = port
}
ci.Addr = net.JoinHostPort(ci.Host, ci.Port)
return ci
}