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certverify.go
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certverify.go
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package apicupcfg
import (
"crypto/x509"
"fmt"
"time"
)
func CertVerify2(certfile string, chainfiles []string, noexpire bool) (bool, error) {
var cert *x509.Certificate
var err error
if len(certfile) > 0 {
//fmt.Printf("parsing file '%s'...\n", certfile)
if cert, err = ParseCertFile(certfile); err != nil {
return false, err
}
// must not be ca cert
if cert.IsCA {
err := fmt.Errorf("file '%s' is ca certificate... subject cn %v, issuer cn %v",
certfile, cert.Subject.CommonName, cert.Issuer.CommonName)
return false, err
}
}
chaincerts := make([]*x509.Certificate, len(chainfiles))
for chainidx, chainfile := range chainfiles {
//fmt.Printf("parsing file '%s'...\n", chainfile)
if chaincerts[chainidx], err = ParseCertFile(chainfile); err != nil {
return false, err
}
cacert := chaincerts[chainidx]
// must be ca cert
if ! cacert.IsCA {
err := fmt.Errorf("file '%s' is not a ca certificate... subject cn %v, issuer cn %v",
chainfile, cacert.Subject.CommonName, cacert.Issuer.CommonName)
return false, err
}
}
chains, err := BuildChain2(cert, chaincerts, noexpire)
//fmt.Printf("%v, %v\n", chains, err)
if err != nil {
return false, err
}
//fmt.Printf("not-before: %v, not after %v\n", cert.NotBefore, cert.NotAfter)
fmt.Printf("\nbuilding trust chain...\n")
for chi, chain := range chains {
for ci, cp := range chain {
isroot := cp.Subject.CommonName == cp.Issuer.CommonName
fmt.Printf("cert[%d,%d]... subj-cn... %v, is-ca... %t, issuer-cn... %v, is-root... %t\n",
chi, ci, cp.Subject.CommonName, cp.IsCA, cp.Issuer.CommonName, isroot)
if ci == len(chain)-1 && isroot {
// chain is terminated with the root cert
return true, nil
}
}
}
// no chains all the way to the root
return false, nil
}
func CertVerify(certfile string, cafile string, rootcafile string, noexpire bool) (bool, error) {
var cert *x509.Certificate
var cacert *x509.Certificate
var rootcert *x509.Certificate
var err error
if len(certfile) > 0 {
//fmt.Printf("parsing file '%s'...\n", certfile)
if cert, err = ParseCertFile(certfile); err != nil {
return false, err
}
// must not be ca cert
if cert.IsCA {
err := fmt.Errorf("file '%s' is ca certificate... subject cn %v, issuer cn %v",
certfile, cert.Subject.CommonName, cert.Issuer.CommonName)
return false, err
}
}
if len(cafile) > 0 {
//fmt.Printf("parsing file '%s'...\n", chainfile)
if cacert, err = ParseCertFile(cafile); err != nil {
return false, err
}
// must be ca cert
if ! cacert.IsCA {
err := fmt.Errorf("file '%s' is not a ca certificate... subject cn %v, issuer cn %v",
cafile, cacert.Subject.CommonName, cacert.Issuer.CommonName)
return false, err
}
}
if len(rootcafile) > 0 {
//fmt.Printf("parsing file '%s'\n...", rootcafile)
if rootcert, err = ParseCertFile(rootcafile); err != nil {
return false, err
}
// must be root cert
isroot := rootcert.Subject.CommonName == rootcert.Issuer.CommonName
//fmt.Printf("rootcert... subj-cn... %v, is-ca... %t, issuer-cn... %v, is-root... %t\n",
// rootcert.Subject.CommonName, rootcert.IsCA, rootcert.Issuer.CommonName, isroot)
if ! isroot {
err := fmt.Errorf("file '%s' is not a root cert... subject cn %v, issuer cn %v",
rootcafile, rootcert.Subject.CommonName, rootcert.Issuer.CommonName)
return false, err
}
}
chains, err := BuildChain(cert, cacert, rootcert, noexpire)
//fmt.Printf("%v, %v\n", chains, err)
if err != nil {
return false, err
}
//fmt.Printf("not-before: %v, not after %v\n", cert.NotBefore, cert.NotAfter)
fmt.Printf("\nbuilding trust chain...\n")
for chi, chain := range chains {
for ci, cp := range chain {
isroot := cp.Subject.CommonName == cp.Issuer.CommonName
fmt.Printf("cert[%d,%d]... subj-cn... %v, is-ca... %t, issuer-cn... %v, is-root... %t\n",
chi, ci, cp.Subject.CommonName, cp.IsCA, cp.Issuer.CommonName, isroot)
if ci == len(chain)-1 && isroot {
// chain is terminated with the root cert
return true, nil
}
}
}
// no chains all the way to the root
return false, nil
}
func BuildChain2(cert *x509.Certificate, fullchain []*x509.Certificate, noexpire bool) ([][]*x509.Certificate, error) {
chainpool := x509.NewCertPool()
rootpool := x509.NewCertPool()
if cert != nil {
for _, c := range fullchain {
if c.IsCA && c.Issuer.CommonName == c.Subject.CommonName {
rootpool.AddCert(c)
} else if c.IsCA {
chainpool.AddCert(c)
}
}
opts := x509.VerifyOptions{Roots:rootpool, Intermediates:chainpool,}
if noexpire {
opts.CurrentTime = cert.NotBefore.Add(time.Duration(time.Hour * 24))
}
fmt.Printf("verifying cert... subject-cn %v\n", cert.Subject.CommonName)
chains, err := cert.Verify(opts)
return chains, err
}
return nil, fmt.Errorf("%s", "build-chain... no certificates to verfiy...")
}
func BuildChain(cert *x509.Certificate, chaincert *x509.Certificate, rootcert *x509.Certificate, noexpire bool) ([][]*x509.Certificate, error) {
chainpool := x509.NewCertPool()
rootpool := x509.NewCertPool()
if cert != nil {
if chaincert != nil {
chainpool.AddCert(chaincert)
}
if rootcert != nil {
rootpool.AddCert(rootcert)
}
opts := x509.VerifyOptions{Roots:rootpool, Intermediates:chainpool,}
if noexpire {
opts.CurrentTime = cert.NotBefore.Add(time.Duration(time.Hour * 24))
}
fmt.Printf("verifying cert... subject-cn %v\n", cert.Subject.CommonName)
chains, err := cert.Verify(opts)
return chains, err
} else if chaincert != nil {
if rootcert != nil {
rootpool.AddCert(rootcert)
}
opts := x509.VerifyOptions{Roots:rootpool,}
if noexpire {
opts.CurrentTime = chaincert.NotBefore.Add(time.Duration(time.Hour * 24))
}
fmt.Printf("verifying cert... subject-cn %v\n", chaincert.Subject.CommonName)
chains, err := chaincert.Verify(opts)
return chains, err
}
return nil, fmt.Errorf("%s", "build-chain... no certificates to verfiy...")
}