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package main
import (
"fmt"
"os"
"path/filepath"
"strings"
"time"
"golang.org/x/crypto/ssh"
)
func main() {
sshDir, err := getSSHDirectory()
if err != nil {
fmt.Fprintf(os.Stderr, "Error getting SSH directory: %v\n", err)
os.Exit(1)
}
certFiles, err := findCertificateFiles(sshDir)
if err != nil {
fmt.Fprintf(os.Stderr, "Error reading SSH directory %s: %v\n", sshDir, err)
os.Exit(1)
}
if len(certFiles) == 0 {
fmt.Printf("No SSH certificates found in %s\n", sshDir)
return
}
fmt.Println("SSH Certificate Report")
fmt.Println("======================")
fmt.Println()
for _, certPath := range certFiles {
checkCertificate(certPath)
fmt.Println()
}
}
func getSSHDirectory() (string, error) {
home, err := os.UserHomeDir()
if err != nil {
return "", fmt.Errorf("failed to get home directory: %w", err)
}
return filepath.Join(home, ".ssh"), nil
}
func findCertificateFiles(sshDir string) ([]string, error) {
entries, err := os.ReadDir(sshDir)
if err != nil {
return nil, err
}
var certFiles []string
for _, entry := range entries {
if entry.IsDir() {
continue
}
name := entry.Name()
if strings.HasSuffix(name, ".pub") && strings.Contains(name, "-cert.pub") {
certFiles = append(certFiles, filepath.Join(sshDir, name))
}
}
return certFiles, nil
}
func checkCertificate(certPath string) {
fmt.Printf("Certificate: %s\n", certPath)
certData, err := os.ReadFile(certPath)
if err != nil {
fmt.Printf(" Error: Failed to read certificate file: %v\n", err)
return
}
pubKey, _, _, _, err := ssh.ParseAuthorizedKey(certData)
if err != nil {
fmt.Printf(" Error: Failed to parse certificate: %v\n", err)
return
}
cert, ok := pubKey.(*ssh.Certificate)
if !ok {
fmt.Printf(" Error: Not an SSH certificate\n")
return
}
displayCertificateInfo(cert)
}
func displayCertificateInfo(cert *ssh.Certificate) {
certType := "Unknown"
switch cert.CertType {
case ssh.UserCert:
certType = "ssh-ed25519-cert-v01@openssh.com user certificate"
case ssh.HostCert:
certType = "ssh-ed25519-cert-v01@openssh.com host certificate"
}
fmt.Printf(" Type: %s\n", certType)
fmt.Printf(" Public key: %s %s\n", cert.Key.Type(), cert.KeyId)
fmt.Printf(" Signing CA: %s\n", cert.SignatureKey.Type())
fmt.Printf(" Key ID: %s\n", cert.KeyId)
fmt.Printf(" Serial: %d\n", cert.Serial)
validFrom := time.Unix(int64(cert.ValidAfter), 0)
validTo := time.Unix(int64(cert.ValidBefore), 0)
fmt.Printf(" Valid from: %s\n", validFrom.Format("2006-01-02T15:04:05"))
if cert.ValidBefore == ssh.CertTimeInfinity {
fmt.Printf(" Valid to: forever\n")
fmt.Println(" ✓ Certificate is currently valid")
} else {
fmt.Printf(" Valid to: %s\n", validTo.Format("2006-01-02T15:04:05"))
checkCertificateExpiration(validTo)
}
if len(cert.ValidPrincipals) > 0 {
fmt.Println(" Principals:")
for _, principal := range cert.ValidPrincipals {
fmt.Printf(" %s\n", principal)
}
}
if len(cert.CriticalOptions) > 0 {
fmt.Println(" Critical Options:")
for key, value := range cert.CriticalOptions {
if value == "" {
fmt.Printf(" %s\n", key)
} else {
fmt.Printf(" %s %s\n", key, value)
}
}
}
if len(cert.Extensions) > 0 {
fmt.Println(" Extensions:")
for key, value := range cert.Extensions {
if value == "" {
fmt.Printf(" %s\n", key)
} else {
fmt.Printf(" %s %s\n", key, value)
}
}
}
}
func checkCertificateExpiration(validTo time.Time) {
now := time.Now()
if validTo.Before(now) {
fmt.Println(" ⚠️ WARNING: Certificate has EXPIRED!")
} else {
fmt.Println(" ✓ Certificate is currently valid")
}
}
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