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setup.go
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setup.go
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// This file is part of ezBastion.
// ezBastion is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// ezBastion 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 Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with ezBastion. If not, see <https://www.gnu.org/licenses/>.
package setup
import (
"bufio"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/binary"
"encoding/json"
"encoding/pem"
"fmt"
"io/ioutil"
"net"
"os"
"path"
"path/filepath"
"regexp"
"strings"
log "github.com/sirupsen/logrus"
"github.com/ezBastion/ezb_db/configuration"
"github.com/ezbastion/ezb_lib/setupmanager"
fqdn "github.com/ShowMax/go-fqdn"
)
var (
exPath string
confFile string
)
func init() {
ex, _ := os.Executable()
exPath = filepath.Dir(ex)
confFile = path.Join(exPath, "conf/config.json")
}
func CheckConfig() (conf configuration.Configuration, err error) {
raw, err := ioutil.ReadFile(confFile)
if err != nil {
return conf, err
}
json.Unmarshal(raw, &conf)
log.Debug("json config found and loaded.")
return conf, nil
}
func CheckDBFolder() error {
err := setupmanager.CheckFolder(exPath)
if err != nil {
return err
}
if _, err := os.Stat(path.Join(exPath, "db")); os.IsNotExist(err) {
err = os.MkdirAll(path.Join(exPath, "db"), 0600)
if err != nil {
return err
}
log.Println("Make db folder.")
}
return nil
}
func Setup(isIntSess bool) error {
_fqdn := fqdn.Get()
quiet := true
hostname, _ := os.Hostname()
err := CheckDBFolder()
if err != nil {
return err
}
conf, err := CheckConfig()
if err != nil {
quiet = false
conf.ListenJWT = ":8443"
conf.ListenPKI = ":8444"
conf.ServiceFullName = "Easy Bastion Database"
conf.ServiceName = "ezb_db"
conf.Logger.LogLevel = "warning"
conf.Logger.MaxSize = 10
conf.Logger.MaxBackups = 5
conf.Logger.MaxAge = 180
conf.CaCert = "cert/ca.crt"
conf.PrivateKey = "cert/ezb_db.key"
conf.PublicCert = "cert/ezb_db.crt"
conf.EzbPki = "localhost:6000"
conf.SAN = []string{_fqdn, hostname}
conf.DB = "sqlite"
conf.SQLITE.DBPath = "db/ezb_db.db"
conf.STA = "http://change.me/token"
}
_, fica := os.Stat(path.Join(exPath, conf.CaCert))
_, fipriv := os.Stat(path.Join(exPath, conf.PrivateKey))
_, fipub := os.Stat(path.Join(exPath, conf.PublicCert))
if quiet == false {
fmt.Print("\n\n")
fmt.Println("***********")
fmt.Println("*** PKI ***")
fmt.Println("***********")
fmt.Println("ezBastion nodes use elliptic curve digital signature algorithm ")
fmt.Println("(ECDSA) to communicate.")
fmt.Println("We need ezb_pki address and port, to request certificat pair.")
fmt.Println("ex: 10.20.1.2:6000 pki.domain.local:6000")
for {
p := askForValue("ezb_pki", conf.EzbPki, `^[a-zA-Z0-9-\.]+:[0-9]{4,5}$`)
c := askForConfirmation(fmt.Sprintf("pki address (%s) ok?", p))
if c {
conn, err := net.Dial("tcp", p)
if err != nil {
fmt.Printf("## Failed to connect to %s ##\n", p)
} else {
conn.Close()
conf.EzbPki = p
break
}
}
}
fmt.Print("\n\n")
fmt.Println("Certificat Subject Alternative Name.")
fmt.Printf("\nBy default using: <%s, %s> as SAN. Add more ?\n", _fqdn, hostname)
for {
tmp := conf.SAN
san := askForValue("SAN (comma separated list)", strings.Join(conf.SAN, ","), `(?m)^[[:ascii:]]*,?$`)
t := strings.Replace(san, " ", "", -1)
tmp = strings.Split(t, ",")
c := askForConfirmation(fmt.Sprintf("SAN list %s ok?", tmp))
if c {
conf.SAN = tmp
break
}
}
}
if os.IsNotExist(fica) || os.IsNotExist(fipriv) || os.IsNotExist(fipub) {
keyFile := path.Join(exPath, conf.PrivateKey)
certFile := path.Join(exPath, conf.PublicCert)
caFile := path.Join(exPath, conf.CaCert)
request := newCertificateRequest(conf.ServiceName, 730, conf.SAN)
generate(request, conf.EzbPki, certFile, keyFile, caFile)
}
if quiet == false {
c, _ := json.Marshal(conf)
ioutil.WriteFile(confFile, c, 0600)
log.Println(confFile, " saved.")
}
return nil
}
func newCertificateRequest(commonName string, duration int, addresses []string) *x509.CertificateRequest {
certificate := x509.CertificateRequest{
Subject: pkix.Name{
Organization: []string{"ezBastion"},
CommonName: commonName,
},
SignatureAlgorithm: x509.ECDSAWithSHA256,
}
for i := 0; i < len(addresses); i++ {
if ip := net.ParseIP(addresses[i]); ip != nil {
certificate.IPAddresses = append(certificate.IPAddresses, ip)
} else {
certificate.DNSNames = append(certificate.DNSNames, addresses[i])
}
}
return &certificate
}
func generate(certificate *x509.CertificateRequest, ezbpki, certFilename, keyFilename, caFileName string) {
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
fmt.Println("Failed to generate private key:", err)
os.Exit(1)
}
derBytes, err := x509.CreateCertificateRequest(rand.Reader, certificate, priv)
if err != nil {
return
}
fmt.Println("Created Certificate Signing Request for client.")
conn, err := net.Dial("tcp", ezbpki)
if err != nil {
return
}
defer conn.Close()
fmt.Println("Successfully connected to Root Certificate Authority.")
writer := bufio.NewWriter(conn)
// Send two-byte header containing the number of ASN1 bytes transmitted.
header := make([]byte, 2)
binary.LittleEndian.PutUint16(header, uint16(len(derBytes)))
_, err = writer.Write(header)
if err != nil {
return
}
// Now send the certificate request data
_, err = writer.Write(derBytes)
if err != nil {
return
}
err = writer.Flush()
if err != nil {
return
}
fmt.Println("Transmitted Certificate Signing Request to RootCA.")
// The RootCA will now send our signed certificate back for us to read.
reader := bufio.NewReader(conn)
// Read header containing the size of the ASN1 data.
certHeader := make([]byte, 2)
_, err = reader.Read(certHeader)
if err != nil {
return
}
certSize := binary.LittleEndian.Uint16(certHeader)
// Now read the certificate data.
certBytes := make([]byte, certSize)
_, err = reader.Read(certBytes)
if err != nil {
return
}
fmt.Println("Received new Certificate from RootCA.")
newCert, err := x509.ParseCertificate(certBytes)
if err != nil {
return
}
// Finally, the RootCA will send its own certificate back so that we can validate the new certificate.
rootCertHeader := make([]byte, 2)
_, err = reader.Read(rootCertHeader)
if err != nil {
return
}
rootCertSize := binary.LittleEndian.Uint16(rootCertHeader)
// Now read the certificate data.
rootCertBytes := make([]byte, rootCertSize)
_, err = reader.Read(rootCertBytes)
if err != nil {
return
}
fmt.Println("Received Root Certificate from RootCA.")
rootCert, err := x509.ParseCertificate(rootCertBytes)
if err != nil {
return
}
err = validateCertificate(newCert, rootCert)
if err != nil {
return
}
// all good save the files
keyOut, err := os.OpenFile(keyFilename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
fmt.Println("Failed to open key "+keyFilename+" for writing:", err)
os.Exit(1)
}
b, err := x509.MarshalECPrivateKey(priv)
if err != nil {
fmt.Println("Failed to marshal priv:", err)
os.Exit(1)
}
pem.Encode(keyOut, &pem.Block{Type: "EC PRIVATE KEY", Bytes: b})
keyOut.Close()
certOut, err := os.Create(certFilename)
if err != nil {
fmt.Println("Failed to open "+certFilename+" for writing:", err)
os.Exit(1)
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: certBytes})
certOut.Close()
caOut, err := os.Create(caFileName)
if err != nil {
fmt.Println("Failed to open "+caFileName+" for writing:", err)
os.Exit(1)
}
pem.Encode(caOut, &pem.Block{Type: "CERTIFICATE", Bytes: rootCertBytes})
caOut.Close()
}
func validateCertificate(newCert *x509.Certificate, rootCert *x509.Certificate) error {
roots := x509.NewCertPool()
roots.AddCert(rootCert)
verifyOptions := x509.VerifyOptions{
Roots: roots,
KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
}
_, err := newCert.Verify(verifyOptions)
if err != nil {
fmt.Println("Failed to verify chain of trust.")
return err
}
fmt.Println("Successfully verified chain of trust.")
return nil
}
func askForConfirmation(s string) bool {
reader := bufio.NewReader(os.Stdin)
for {
fmt.Printf("\n%s [y/n]: ", s)
response, err := reader.ReadString('\n')
if err != nil {
fmt.Println(err)
}
response = strings.ToLower(strings.TrimSpace(response))
if response == "y" || response == "yes" {
return true
} else if response == "n" || response == "no" {
return false
}
}
}
func askForValue(s, def string, pattern string) string {
reader := bufio.NewReader(os.Stdin)
re := regexp.MustCompile(pattern)
for {
fmt.Printf("%s [%s]: ", s, def)
response, err := reader.ReadString('\n')
if err != nil {
fmt.Println(err)
}
response = strings.TrimSpace(response)
if response == "" {
return def
} else if re.MatchString(response) {
return response
} else {
fmt.Printf("[%s] wrong format, must match (%s)\n", response, pattern)
}
}
}