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certdump.go
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certdump.go
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package main
import (
"crypto/x509"
"encoding/hex"
"encoding/pem"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"time"
log "github.com/Sirupsen/logrus"
"github.com/codegangsta/cli"
)
func dumpCert(label string, data []byte) {
offset := 0
for len(data) > 0 {
der, rest := pem.Decode(data)
if der == nil {
log.Debugf("Decode fail on %s", label)
return
}
c, err := x509.ParseCertificate(der.Bytes)
if err != nil {
log.Debugf("Parse error on %s %s", label, err)
return
}
n := time.Now()
valid := "VALID"
if n.Before(c.NotBefore) {
valid = "NOT YET VALID"
} else if n.After(c.NotAfter) {
valid = "EXPIRED"
}
ca := ""
if c.IsCA {
ca = " (Cert is a CA)"
}
sans := c.DNSNames
for _, ip := range c.IPAddresses {
sans = append(sans, ip.String())
}
fmt.Printf(`%s:%d
Subject:%s
CN:%s
ID:%s
O:%s
OU:%s
Serial:%s
Valid between %s and %s (%s)
SANs: %s
Issuer
CN:%s
ID:%s
O:%s
OU:%s
`,
label, offset,
ca,
c.Subject.CommonName,
hex.EncodeToString(c.SubjectKeyId),
c.Subject.Organization,
c.Subject.OrganizationalUnit,
hex.EncodeToString(c.SerialNumber.Bytes()),
c.NotBefore.String(), c.NotAfter.String(), valid,
sans,
c.Issuer.CommonName,
hex.EncodeToString(c.AuthorityKeyId),
c.Issuer.Organization,
c.Issuer.OrganizationalUnit,
)
offset++
data = rest
}
// Could dump much more... https://golang.org/pkg/crypto/x509/#Certificate
}
func scan() {
pem_candidates, _ := filepath.Glob("/*/*.pem")
crt_candidates, _ := filepath.Glob("/*/*.crt")
key_candidates, _ := filepath.Glob("/*/*.key")
candidates := append(pem_candidates, crt_candidates...)
candidates = append(candidates, key_candidates...)
log.Infof("Candidates: %v", candidates)
for _, filename := range candidates {
log.Infof("Loading: %s", filename)
data, err := ioutil.ReadFile(filename)
if err != nil {
continue
}
dumpCert(filename, data)
}
}
func main() {
log.SetOutput(os.Stderr)
app := cli.NewApp()
app.Name = `Certificate Information Tool
By default the tool will read from stdin and dump the cert`
app.Flags = []cli.Flag{
cli.BoolFlag{
Name: "scan",
Usage: "Scan /*/*.pem and display information for all readable certs found",
},
}
app.Action = func(c *cli.Context) error {
if c.Bool("scan") {
scan()
} else {
data, _ := ioutil.ReadAll(os.Stdin)
dumpCert("stdin", data)
}
return nil
}
app.Run(os.Args)
}