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ca.go
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ca.go
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package certs
/*
Sliver Implant Framework
Copyright (C) 2019 Bishop Fox
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import (
"crypto/ecdsa"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"os"
"path"
"github.com/bishopfox/sliver/server/assets"
)
// -----------------------
// CERTIFICATE AUTHORITY
// -----------------------
// SetupCAs - Creates directories for certs
func SetupCAs() {
GenerateCertificateAuthority(ServerCA)
GenerateCertificateAuthority(SliverCA)
GenerateCertificateAuthority(OperatorCA)
GenerateCertificateAuthority(HTTPSCA)
}
func getCertDir() string {
rootDir := assets.GetRootAppDir()
certDir := path.Join(rootDir, "certs")
if _, err := os.Stat(certDir); os.IsNotExist(err) {
err := os.MkdirAll(certDir, 0700)
if err != nil {
certsLog.Fatalf("Failed to create cert dir %s", err)
}
}
return certDir
}
// GenerateCertificateAuthority - Creates a new CA cert for a given type
func GenerateCertificateAuthority(caType string) (*x509.Certificate, *ecdsa.PrivateKey) {
storageDir := getCertDir()
certFilePath := path.Join(storageDir, fmt.Sprintf("%s-ca-cert.pem", caType))
if _, err := os.Stat(certFilePath); os.IsNotExist(err) {
certsLog.Infof("Generating certificate authority for '%s'", caType)
cert, key := GenerateECCCertificate(caType, "", true, false)
SaveCertificateAuthority(caType, cert, key)
}
cert, key, err := GetCertificateAuthority(caType)
if err != nil {
certsLog.Fatalf("Failed to load CA %s", err)
}
return cert, key
}
// GetCertificateAuthority - Get the current CA certificate
func GetCertificateAuthority(caType string) (*x509.Certificate, *ecdsa.PrivateKey, error) {
certPEM, keyPEM, err := GetCertificateAuthorityPEM(caType)
if err != nil {
return nil, nil, err
}
certBlock, _ := pem.Decode(certPEM)
if certBlock == nil {
certsLog.Error("Failed to parse certificate PEM")
return nil, nil, err
}
cert, err := x509.ParseCertificate(certBlock.Bytes)
if err != nil {
certsLog.Error("Failed to parse certificate: " + err.Error())
return nil, nil, err
}
keyBlock, _ := pem.Decode(keyPEM)
if keyBlock == nil {
certsLog.Error("Failed to parse certificate PEM")
return nil, nil, err
}
key, err := x509.ParseECPrivateKey(keyBlock.Bytes)
if err != nil {
certsLog.Error(err)
return nil, nil, err
}
return cert, key, nil
}
// GetCertificateAuthorityPEM - Get PEM encoded CA cert/key
func GetCertificateAuthorityPEM(caType string) ([]byte, []byte, error) {
caType = path.Base(caType)
caCertPath := path.Join(getCertDir(), fmt.Sprintf("%s-ca-cert.pem", caType))
caKeyPath := path.Join(getCertDir(), fmt.Sprintf("%s-ca-key.pem", caType))
certPEM, err := ioutil.ReadFile(caCertPath)
if err != nil {
certsLog.Error(err)
return nil, nil, err
}
keyPEM, err := ioutil.ReadFile(caKeyPath)
if err != nil {
certsLog.Error(err)
return nil, nil, err
}
return certPEM, keyPEM, nil
}
// SaveCertificateAuthority - Save the certificate and the key to the filesystem
// doesn't return an error because errors are fatal. If we can't generate CAs,
// then we can't secure comms and we should die a horrible death.
func SaveCertificateAuthority(caType string, cert []byte, key []byte) {
storageDir := getCertDir()
if _, err := os.Stat(storageDir); os.IsNotExist(err) {
os.MkdirAll(storageDir, 0700)
}
// CAs get written to the filesystem since we control the names and makes them
// easier to move around/backup
certFilePath := path.Join(storageDir, fmt.Sprintf("%s-ca-cert.pem", caType))
keyFilePath := path.Join(storageDir, fmt.Sprintf("%s-ca-key.pem", caType))
err := ioutil.WriteFile(certFilePath, cert, 0600)
if err != nil {
certsLog.Fatalf("Failed write certificate data to: %s", certFilePath)
}
err = ioutil.WriteFile(keyFilePath, key, 0600)
if err != nil {
certsLog.Fatalf("Failed write certificate data to: %s", keyFilePath)
}
}