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Switch to cobra as a CLI framework

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Signed-off-by: Knut Ahlers <knut@ahlers.me>
This commit is contained in:
Knut Ahlers 2018-05-27 12:02:56 +02:00
parent 2cbf5dd6ac
commit 0c61a521c1
Signed by: luzifer
GPG key ID: DC2729FDD34BE99E
9 changed files with 605 additions and 485 deletions
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33
cmd/client.go Normal file
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package cmd
import (
"errors"
"time"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
// clientCmd represents the client command
var clientCmd = &cobra.Command{
Use: "client",
Short: "Generate certificate and output client config",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 || !validateFQDN(args[0]) {
return errors.New("You need to provide a valid FQDN")
}
return generateCertificateConfig("client.conf", args[0])
},
}
func init() {
RootCmd.AddCommand(clientCmd)
clientCmd.Flags().BoolVar(&cfg.AutoRevoke, "auto-revoke", true, "Automatically revoke older certificates for this FQDN")
clientCmd.Flags().DurationVar(&cfg.CertTTL, "ttl", 8760*time.Hour, "Set the TTL for this certificate")
clientCmd.Flags().StringVar(&cfg.OVPNKey, "ovpn-key", "", "Specify a secret name that holds an OpenVPN shared key")
clientCmd.Flags().StringVar(&cfg.TemplatePath, "template-path", ".", "Path to read the client.conf / server.conf template from")
viper.BindPFlags(clientCmd.Flags())
}

208
cmd/helpers.go Normal file
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package cmd
import (
"crypto/x509"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"os"
"path"
"strings"
"text/template"
"time"
log "github.com/sirupsen/logrus"
"github.com/spf13/viper"
)
func fetchCertificateBySerial(serial string) (*x509.Certificate, bool, error) {
path := strings.Join([]string{strings.Trim(viper.GetString("pki-mountpoint"), "/"), "cert", serial}, "/")
cs, err := client.Logical().Read(path)
if err != nil {
return nil, false, fmt.Errorf("Unable to read certificate: %s", err.Error())
}
revoked := false
if revokationTime, ok := cs.Data["revocation_time"]; ok {
rt, err := revokationTime.(json.Number).Int64()
if err == nil && rt < time.Now().Unix() && rt > 0 {
// Don't display revoked certs
revoked = true
}
}
data, _ := pem.Decode([]byte(cs.Data["certificate"].(string)))
cert, err := x509.ParseCertificate(data.Bytes)
return cert, revoked, err
}
func fetchOVPNKey() (string, error) {
path := strings.Trim(viper.GetString("ovpn-key"), "/")
secret, err := client.Logical().Read(path)
if err != nil {
return "", err
}
if secret == nil || secret.Data == nil {
return "", errors.New("Got no data from backend")
}
key, ok := secret.Data["key"]
if !ok {
return "", errors.New("Within specified secret no entry named 'key' was found")
}
return key.(string), nil
}
func fetchValidCertificatesFromVault() ([]*x509.Certificate, error) {
res := []*x509.Certificate{}
path := strings.Join([]string{strings.Trim(viper.GetString("pki-mountpoint"), "/"), "certs"}, "/")
secret, err := client.Logical().List(path)
if err != nil {
return res, err
}
if secret == nil {
return nil, errors.New("Was not able to read list of certificates")
}
if secret.Data == nil {
return res, errors.New("Got no data from backend")
}
for _, serial := range secret.Data["keys"].([]interface{}) {
cert, revoked, err := fetchCertificateBySerial(serial.(string))
if err != nil {
return res, err
}
if revoked {
continue
}
res = append(res, cert)
}
return res, nil
}
func generateCertificate(fqdn string) (*templateVars, error) {
path := strings.Join([]string{strings.Trim(viper.GetString("pki-mountpoint"), "/"), "issue", viper.GetString("pki-role")}, "/")
secret, err := client.Logical().Write(path, map[string]interface{}{
"common_name": fqdn,
"ttl": viper.GetDuration("ttl").String(),
})
if err != nil {
return nil, err
}
if secret.Data == nil {
return nil, errors.New("Got no data from backend")
}
log.WithFields(log.Fields{
"cn": fqdn,
"serial": secret.Data["serial_number"].(string),
}).Debug("Generated new certificate")
return &templateVars{
Certificate: secret.Data["certificate"].(string),
PrivateKey: secret.Data["private_key"].(string),
}, nil
}
func generateCertificateConfig(tplName, fqdn string) error {
if viper.GetBool("auto-revoke") {
if err := revokeCertificateByFQDN(fqdn); err != nil {
return fmt.Errorf("Could not revoke certificate: %s", err)
}
}
caCert, err := getCAChain()
if err != nil {
caCert, err = getCACert()
if err != nil {
return fmt.Errorf("Could not load CA certificate: %s", err)
}
}
tplv, err := generateCertificate(fqdn)
if err != nil {
return fmt.Errorf("Could not generate new certificate: %s", err)
}
tplv.CertAuthority = caCert
if viper.GetString("ovpn-key") != "" {
tplv.TLSAuth, err = fetchOVPNKey()
if err != nil {
return fmt.Errorf("Could not fetch TLSAuth key: %s", err)
}
}
if err := renderTemplate(tplName, tplv); err != nil {
return fmt.Errorf("Could not render configuration: %s", err)
}
return nil
}
func getCACert() (string, error) {
path := strings.Join([]string{strings.Trim(viper.GetString("pki-mountpoint"), "/"), "cert", "ca"}, "/")
cs, err := client.Logical().Read(path)
if err != nil {
return "", errors.New("Unable to read certificate: " + err.Error())
}
return cs.Data["certificate"].(string), nil
}
func getCAChain() (string, error) {
path := strings.Join([]string{strings.Trim(viper.GetString("pki-mountpoint"), "/"), "cert", "ca_chain"}, "/")
cs, err := client.Logical().Read(path)
if err != nil {
return "", errors.New("Unable to read ca_chain: " + err.Error())
}
if cs.Data == nil {
return "", errors.New("Unable to read ca_chain: Empty")
}
cert, ok := cs.Data["certificate"]
if !ok || len(cert.(string)) == 0 {
return "", errors.New("Unable to read ca_chain: Empty")
}
return cert.(string), nil
}
func renderTemplate(tplName string, tplv *templateVars) error {
raw, err := ioutil.ReadFile(path.Join(viper.GetString("template-path"), tplName))
if err != nil {
return err
}
tpl, err := template.New("tpl").Parse(string(raw))
if err != nil {
return err
}
return tpl.Execute(os.Stdout, tplv)
}
func validateFQDN(fqdn string) bool {
// Very basic check: It should be delimited by "." and have at least 2 components
// Vault will do a more sophisticated check
return len(strings.Split(fqdn, ".")) > 1
}
func validateSerial(serial string) bool {
// Also very basic check, also here Vault does the real validation
return len(strings.Split(serial, ":")) > 1
}

72
cmd/list.go Normal file
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package cmd
import (
"os"
"sort"
"github.com/hashicorp/vault/helper/certutil"
"github.com/olekukonko/tablewriter"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
// listCmd represents the list command
var listCmd = &cobra.Command{
Use: "list",
Short: "List all valid (not expired, not revoked) certificates",
RunE: func(cmd *cobra.Command, args []string) error {
return listCertificates()
},
}
func init() {
RootCmd.AddCommand(listCmd)
listCmd.Flags().StringVar(&cfg.Sort, "sort", "fqdn", "How to sort list output (fqdn, issuedate, expiredate)")
viper.BindPFlags(listCmd.Flags())
}
func listCertificates() error {
table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"FQDN", "Not Before", "Not After", "Serial"})
table.SetBorder(false)
lines := []listCertificatesTableRow{}
certs, err := fetchValidCertificatesFromVault()
if err != nil {
return err
}
for _, cert := range certs {
lines = append(lines, listCertificatesTableRow{
FQDN: cert.Subject.CommonName,
NotBefore: cert.NotBefore,
NotAfter: cert.NotAfter,
Serial: certutil.GetHexFormatted(cert.SerialNumber.Bytes(), ":"),
})
}
sort.Slice(lines, func(i, j int) bool {
switch viper.GetString("sort") {
case "issuedate":
return lines[i].NotBefore.Before(lines[j].NotBefore)
case "expiredate":
return lines[i].NotAfter.Before(lines[j].NotAfter)
default:
if lines[i].FQDN == lines[j].FQDN {
return lines[i].NotBefore.Before(lines[j].NotBefore)
}
return lines[i].FQDN < lines[j].FQDN
}
})
for _, line := range lines {
table.Append(line.ToLine())
}
table.Render()
return nil
}

51
cmd/revoke-serial.go Normal file
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package cmd
import (
"errors"
"fmt"
"strings"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
// revokeSerialCmd represents the revoke-serial command
var revokeSerialCmd = &cobra.Command{
Use: "revoke-serial <serial>",
Short: "Revoke certificate by serial number",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 || !validateSerial(args[0]) {
return errors.New("You need to provide a valid serial")
}
return revokeCertificateBySerial(args[0])
},
}
func init() {
RootCmd.AddCommand(revokeSerialCmd)
}
func revokeCertificateBySerial(serial string) error {
cert, revoked, err := fetchCertificateBySerial(serial)
if err != nil {
return err
}
if revoked {
return nil
}
path := strings.Join([]string{strings.Trim(viper.GetString("pki-mountpoint"), "/"), "revoke"}, "/")
if _, err := client.Logical().Write(path, map[string]interface{}{
"serial_number": serial,
}); err != nil {
return fmt.Errorf("Revoke of serial %q failed: %s", serial, err.Error())
}
log.WithFields(log.Fields{
"cn": cert.Subject.CommonName,
"serial": serial,
}).Info("Revoked certificate")
return nil
}

42
cmd/revoke.go Normal file
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package cmd
import (
"errors"
"github.com/hashicorp/vault/helper/certutil"
"github.com/spf13/cobra"
)
// revokeCmd represents the revoke command
var revokeCmd = &cobra.Command{
Use: "revoke <fqdn>",
Short: "Revoke all certificates matching to FQDN",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 || !validateFQDN(args[0]) {
return errors.New("You need to provide a valid FQDN")
}
return revokeCertificateByFQDN(args[0])
},
}
func init() {
RootCmd.AddCommand(revokeCmd)
}
func revokeCertificateByFQDN(fqdn string) error {
certs, err := fetchValidCertificatesFromVault()
if err != nil {
return err
}
for _, cert := range certs {
if cert.Subject.CommonName == fqdn {
if err := revokeCertificateBySerial(certutil.GetHexFormatted(cert.SerialNumber.Bytes(), ":")); err != nil {
return err
}
}
}
return nil
}

137
cmd/root.go Normal file
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package cmd
import (
"fmt"
"io/ioutil"
"os"
"time"
"github.com/hashicorp/vault/api"
homedir "github.com/mitchellh/go-homedir"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
const dateFormat = "2006-01-02 15:04:05"
var (
cfg = struct {
ConfigFile string
VaultAddress string
VaultToken string
PKIMountPoint string
PKIRole string
AutoRevoke bool
CertTTL time.Duration
OVPNKey string
LogLevel string
Sort string
TemplatePath string
}{}
version string
client *api.Client
)
// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
Use: "vault-openvpn",
Short: "Manage OpenVPN configuration combined with a Vault PKI",
PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
// Configure log level
if logLevel, err := log.ParseLevel(viper.GetString("log-level")); err == nil {
log.SetLevel(logLevel)
} else {
return fmt.Errorf("Unable to interprete log level: %s", err)
}
// Ensure token is present
if viper.GetString("vault-token") == "" {
return fmt.Errorf("You need to set vault-token")
}
clientConfig := api.DefaultConfig()
clientConfig.ReadEnvironment()
clientConfig.Address = viper.GetString("vault-addr")
var err error
client, err = api.NewClient(clientConfig)
if err != nil {
return fmt.Errorf("Could not create Vault client: %s", err)
}
client.SetToken(viper.GetString("vault-token"))
return nil
},
}
// Execute adds all child commands to the root command sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute(ver string) {
version = ver
if err := RootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(-1)
}
}
func init() {
cobra.OnInitialize(initConfig)
RootCmd.PersistentFlags().StringVar(&cfg.ConfigFile, "config", "", "config file (default is $HOME/.config/vault-openvpn.yaml)")
RootCmd.PersistentFlags().StringVar(&cfg.VaultAddress, "vault-addr", "https://127.0.0.1:8200", "Vault API address")
RootCmd.PersistentFlags().StringVar(&cfg.VaultToken, "vault-token", "", "Specify a token to use (~/.vault-token file is taken into account)")
RootCmd.PersistentFlags().StringVar(&cfg.PKIMountPoint, "pki-mountpoint", "/pki", "Path the PKI provider is mounted to")
RootCmd.PersistentFlags().StringVar(&cfg.PKIRole, "pki-role", "openvpn", "Role defined in the PKI usable by the token and able to write the specified FQDN")
RootCmd.PersistentFlags().StringVar(&cfg.LogLevel, "log-level", "info", "Log level to use (debug, info, warning, error)")
viper.BindPFlags(RootCmd.PersistentFlags())
viper.BindEnv("vault-addr", "VAULT_ADDR")
viper.BindEnv("vault-token", "VAULT_TOKEN")
if tok := vaultTokenFromDisk(); tok != "" {
viper.Set("vault-token", tok)
}
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfg.ConfigFile != "" { // enable ability to specify config file via flag
viper.SetConfigFile(cfg.ConfigFile)
}
viper.SetConfigName("vault-openvpn") // name of config file (without extension)
viper.AddConfigPath("$HOME") // adding home directory as first search path
viper.AddConfigPath("$HOME/.config") // adding config directory as second search path
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
log.Debugf("Using config file: %s", viper.ConfigFileUsed())
}
}
func vaultTokenFromDisk() string {
vf, err := homedir.Expand("~/.vault-token")
if err != nil {
return ""
}
data, err := ioutil.ReadFile(vf)
if err != nil {
return ""
}
return string(data)
}

33
cmd/server.go Normal file
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package cmd
import (
"errors"
"time"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
// serverCmd represents the server command
var serverCmd = &cobra.Command{
Use: "server",
Short: "Generate certificate and output server config",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 || !validateFQDN(args[0]) {
return errors.New("You need to provide a valid FQDN")
}
return generateCertificateConfig("server.conf", args[0])
},
}
func init() {
RootCmd.AddCommand(serverCmd)
serverCmd.Flags().BoolVar(&cfg.AutoRevoke, "auto-revoke", true, "Automatically revoke older certificates for this FQDN")
serverCmd.Flags().DurationVar(&cfg.CertTTL, "ttl", 8760*time.Hour, "Set the TTL for this certificate")
serverCmd.Flags().StringVar(&cfg.OVPNKey, "ovpn-key", "", "Specify a secret name that holds an OpenVPN shared key")
serverCmd.Flags().StringVar(&cfg.TemplatePath, "template-path", ".", "Path to read the client.conf / server.conf template from")
viper.BindPFlags(serverCmd.Flags())
}

26
cmd/structs.go Normal file
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package cmd
import "time"
type templateVars struct {
CertAuthority string
Certificate string
PrivateKey string
TLSAuth string
}
type listCertificatesTableRow struct {
FQDN string
NotBefore time.Time
NotAfter time.Time
Serial string
}
func (l listCertificatesTableRow) ToLine() []string {
return []string{
l.FQDN,
l.NotBefore.Format(dateFormat),
l.NotAfter.Format(dateFormat),
l.Serial,
}
}

488
main.go
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@ -1,491 +1,9 @@
package main
import (
"crypto/x509"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"os"
"path"
"sort"
"strings"
"text/template"
"time"
import "github.com/Luzifer/vault-openvpn/cmd"
yaml "gopkg.in/yaml.v2"
"github.com/Luzifer/rconfig"
log "github.com/Sirupsen/logrus"
"github.com/hashicorp/vault/api"
"github.com/hashicorp/vault/helper/certutil"
homedir "github.com/mitchellh/go-homedir"
"github.com/olekukonko/tablewriter"
)
const (
actionList = "list"
actionMakeClientConfig = "client"
actionMakeServerConfig = "server"
actionRevoke = "revoke"
actionRevokeSerial = "revoke-serial"
dateFormat = "2006-01-02 15:04:05"
defaultsFile = "~/.config/vault-openvpn.yaml"
)
var (
cfg = struct {
VaultAddress string `flag:"vault-addr" env:"VAULT_ADDR" default:"https://127.0.0.1:8200" description:"Vault API address"`
VaultToken string `flag:"vault-token" env:"VAULT_TOKEN" vardefault:"vault-token" description:"Specify a token to use instead of app-id auth"`
PKIMountPoint string `flag:"pki-mountpoint" vardefault:"pki-mountpoint" description:"Path the PKI provider is mounted to"`
PKIRole string `flag:"pki-role" vardefault:"pki-role" description:"Role defined in the PKI usable by the token and able to write the specified FQDN"`
AutoRevoke bool `flag:"auto-revoke" vardefault:"auto-revoke" description:"Automatically revoke older certificates for this FQDN"`
CertTTL time.Duration `flag:"ttl" vardefault:"ttl" description:"Set the TTL for this certificate"`
OVPNKey string `flag:"ovpn-key" vardefault:"ovpn-key" description:"Specify a secret name that holds an OpenVPN shared key"`
LogLevel string `flag:"log-level" vardefault:"log-level" description:"Log level to use (debug, info, warning, error)"`
Sort string `flag:"sort" vardefault:"sort" description:"How to sort list output (fqdn, issuedate, expiredate)"`
TemplatePath string `flag:"template-path" vardefault:"template-path" description:"Path to read the client.conf / server.conf template from"`
VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
}{}
defaultConfig = map[string]string{
"auto-revoke": "true",
"log-level": "info",
"ovpn-key": "",
"pki-mountpoint": "/pki",
"pki-role": "openvpn",
"sort": "fqdn",
"template-path": ".",
"ttl": "8760h",
}
version = "dev"
client *api.Client
)
type templateVars struct {
CertAuthority string
Certificate string
PrivateKey string
TLSAuth string
}
type listCertificatesTableRow struct {
FQDN string
NotBefore time.Time
NotAfter time.Time
Serial string
}
func (l listCertificatesTableRow) ToLine() []string {
return []string{
l.FQDN,
l.NotBefore.Format(dateFormat),
l.NotAfter.Format(dateFormat),
l.Serial,
}
}
func vaultTokenFromDisk() string {
vf, err := homedir.Expand("~/.vault-token")
if err != nil {
return ""
}
data, err := ioutil.ReadFile(vf)
if err != nil {
return ""
}
return string(data)
}
func defualtsFromDisk() map[string]string {
res := defaultConfig
df, err := homedir.Expand(defaultsFile)
if err != nil {
return res
}
yamlSource, err := ioutil.ReadFile(df)
if err != nil {
return res
}
if err := yaml.Unmarshal(yamlSource, &res); err != nil {
log.Errorf("Unable to parse defaults file %q: %s", defaultsFile, err)
}
return res
}
func init() {
defaults := defualtsFromDisk()
defaults["vault-token"] = vaultTokenFromDisk()
rconfig.SetVariableDefaults(defaults)
if err := rconfig.Parse(&cfg); err != nil {
log.Fatalf("Unable to parse commandline options: %s", err)
}
if logLevel, err := log.ParseLevel(cfg.LogLevel); err == nil {
log.SetLevel(logLevel)
} else {
log.Fatalf("Unable to interprete log level: %s", err)
}
if cfg.VersionAndExit {
fmt.Printf("vault-openvpn %s\n", version)
os.Exit(0)
}
if cfg.VaultToken == "" {
log.Fatalf("[ERR] You need to set vault-token")
}
}
var version = "dev"
func main() {
if len(rconfig.Args()) < 2 {
fmt.Println("Usage: vault-openvpn [options] <action>")
fmt.Println(" client <fqdn> - Generate certificate and output client config")
fmt.Println(" server <fqdn> - Generate certificate and output server config")
fmt.Println(" list - List all valid (not expired, not revoked) certificates")
fmt.Println(" revoke <fqdn> - Revoke all certificates matching to FQDN")
fmt.Println(" revoke-serial <serial> - Revoke certificate by serial number")
os.Exit(1)
}
action := rconfig.Args()[1]
var err error
clientConfig := api.DefaultConfig()
clientConfig.ReadEnvironment()
clientConfig.Address = cfg.VaultAddress
client, err = api.NewClient(clientConfig)
if err != nil {
log.Fatalf("Could not create Vault client: %s", err)
}
client.SetToken(cfg.VaultToken)
switch action {
case actionRevoke:
if len(rconfig.Args()) < 3 || !validateFQDN(rconfig.Args()[2]) {
log.Fatalf("You need to provide a valid FQDN")
}
if err := revokeCertificateByFQDN(rconfig.Args()[2]); err != nil {
log.Fatalf("Could not revoke certificate: %s", err)
}
case actionRevokeSerial:
if len(rconfig.Args()) < 3 || !validateSerial(rconfig.Args()[2]) {
log.Fatalf("You need to provide a valid serial")
}
if err := revokeCertificateBySerial(rconfig.Args()[2]); err != nil {
log.Fatalf("Could not revoke certificate: %s", err)
}
case actionMakeClientConfig:
if len(rconfig.Args()) < 3 || !validateFQDN(rconfig.Args()[2]) {
log.Fatalf("You need to provide a valid FQDN")
}
if err := generateCertificateConfig("client.conf", rconfig.Args()[2]); err != nil {
log.Fatalf("Unable to generate config file: %s", err)
}
case actionMakeServerConfig:
if len(rconfig.Args()) < 3 || !validateFQDN(rconfig.Args()[2]) {
log.Fatalf("You need to provide a valid FQDN")
}
if err := generateCertificateConfig("server.conf", rconfig.Args()[2]); err != nil {
log.Fatalf("Unable to generate config file: %s", err)
}
case actionList:
if err := listCertificates(); err != nil {
log.Fatalf("Unable to list certificates: %s", err)
}
default:
log.Fatalf("Unknown action: %s", action)
}
}
func validateFQDN(fqdn string) bool {
// Very basic check: It should be delimited by "." and have at least 2 components
// Vault will do a more sophisticated check
return len(strings.Split(fqdn, ".")) > 1
}
func validateSerial(serial string) bool {
// Also very basic check, also here Vault does the real validation
return len(strings.Split(serial, ":")) > 1
}
func listCertificates() error {
table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"FQDN", "Not Before", "Not After", "Serial"})
table.SetBorder(false)
lines := []listCertificatesTableRow{}
certs, err := fetchValidCertificatesFromVault()
if err != nil {
return err
}
for _, cert := range certs {
lines = append(lines, listCertificatesTableRow{
FQDN: cert.Subject.CommonName,
NotBefore: cert.NotBefore,
NotAfter: cert.NotAfter,
Serial: certutil.GetHexFormatted(cert.SerialNumber.Bytes(), ":"),
})
}
sort.Slice(lines, func(i, j int) bool {
switch cfg.Sort {
case "issuedate":
return lines[i].NotBefore.Before(lines[j].NotBefore)
case "expiredate":
return lines[i].NotAfter.Before(lines[j].NotAfter)
default:
if lines[i].FQDN == lines[j].FQDN {
return lines[i].NotBefore.Before(lines[j].NotBefore)
}
return lines[i].FQDN < lines[j].FQDN
}
})
for _, line := range lines {
table.Append(line.ToLine())
}
table.Render()
return nil
}
func generateCertificateConfig(tplName, fqdn string) error {
if cfg.AutoRevoke {
if err := revokeCertificateByFQDN(fqdn); err != nil {
return fmt.Errorf("Could not revoke certificate: %s", err)
}
}
caCert, err := getCAChain()
if err != nil {
caCert, err = getCACert()
if err != nil {
return fmt.Errorf("Could not load CA certificate: %s", err)
}
}
tplv, err := generateCertificate(fqdn)
if err != nil {
return fmt.Errorf("Could not generate new certificate: %s", err)
}
tplv.CertAuthority = caCert
if cfg.OVPNKey != "" {
tplv.TLSAuth, err = fetchOVPNKey()
if err != nil {
return fmt.Errorf("Could not fetch TLSAuth key: %s", err)
}
}
if err := renderTemplate(tplName, tplv); err != nil {
return fmt.Errorf("Could not render configuration: %s", err)
}
return nil
}
func renderTemplate(tplName string, tplv *templateVars) error {
raw, err := ioutil.ReadFile(path.Join(cfg.TemplatePath, tplName))
if err != nil {
return err
}
tpl, err := template.New("tpl").Parse(string(raw))
if err != nil {
return err
}
return tpl.Execute(os.Stdout, tplv)
}
func fetchCertificateBySerial(serial string) (*x509.Certificate, bool, error) {
path := strings.Join([]string{strings.Trim(cfg.PKIMountPoint, "/"), "cert", serial}, "/")
cs, err := client.Logical().Read(path)
if err != nil {
return nil, false, fmt.Errorf("Unable to read certificate: %s", err.Error())
}
revoked := false
if revokationTime, ok := cs.Data["revocation_time"]; ok {
rt, err := revokationTime.(json.Number).Int64()
if err == nil && rt < time.Now().Unix() && rt > 0 {
// Don't display revoked certs
revoked = true
}
}
data, _ := pem.Decode([]byte(cs.Data["certificate"].(string)))
cert, err := x509.ParseCertificate(data.Bytes)
return cert, revoked, err
}
func fetchValidCertificatesFromVault() ([]*x509.Certificate, error) {
res := []*x509.Certificate{}
path := strings.Join([]string{strings.Trim(cfg.PKIMountPoint, "/"), "certs"}, "/")
secret, err := client.Logical().List(path)
if err != nil {
return res, err
}
if secret == nil {
return nil, errors.New("Was not able to read list of certificates")
}
if secret.Data == nil {
return res, errors.New("Got no data from backend")
}
for _, serial := range secret.Data["keys"].([]interface{}) {
cert, revoked, err := fetchCertificateBySerial(serial.(string))
if err != nil {
return res, err
}
if revoked {
continue
}
res = append(res, cert)
}
return res, nil
}
func revokeCertificateByFQDN(fqdn string) error {
certs, err := fetchValidCertificatesFromVault()
if err != nil {
return err
}
for _, cert := range certs {
if cert.Subject.CommonName == fqdn {
if err := revokeCertificateBySerial(certutil.GetHexFormatted(cert.SerialNumber.Bytes(), ":")); err != nil {
return err
}
}
}
return nil
}
func revokeCertificateBySerial(serial string) error {
cert, revoked, err := fetchCertificateBySerial(serial)
if err != nil {
return err
}
if revoked {
return nil
}
path := strings.Join([]string{strings.Trim(cfg.PKIMountPoint, "/"), "revoke"}, "/")
if _, err := client.Logical().Write(path, map[string]interface{}{
"serial_number": serial,
}); err != nil {
return fmt.Errorf("Revoke of serial %q failed: %s", serial, err.Error())
}
log.WithFields(log.Fields{
"cn": cert.Subject.CommonName,
"serial": serial,
}).Info("Revoked certificate")
return nil
}
func getCAChain() (string, error) {
path := strings.Join([]string{strings.Trim(cfg.PKIMountPoint, "/"), "cert", "ca_chain"}, "/")
cs, err := client.Logical().Read(path)
if err != nil {
return "", errors.New("Unable to read ca_chain: " + err.Error())
}
if cs.Data == nil {
return "", errors.New("Unable to read ca_chain: Empty")
}
cert, ok := cs.Data["certificate"]
if !ok || len(cert.(string)) == 0 {
return "", errors.New("Unable to read ca_chain: Empty")
}
return cert.(string), nil
}
func getCACert() (string, error) {
path := strings.Join([]string{strings.Trim(cfg.PKIMountPoint, "/"), "cert", "ca"}, "/")
cs, err := client.Logical().Read(path)
if err != nil {
return "", errors.New("Unable to read certificate: " + err.Error())
}
return cs.Data["certificate"].(string), nil
}
func fetchOVPNKey() (string, error) {
path := strings.Trim(cfg.OVPNKey, "/")
secret, err := client.Logical().Read(path)
if err != nil {
return "", err
}
if secret == nil || secret.Data == nil {
return "", errors.New("Got no data from backend")
}
key, ok := secret.Data["key"]
if !ok {
return "", errors.New("Within specified secret no entry named 'key' was found")
}
return key.(string), nil
}
func generateCertificate(fqdn string) (*templateVars, error) {
path := strings.Join([]string{strings.Trim(cfg.PKIMountPoint, "/"), "issue", cfg.PKIRole}, "/")
secret, err := client.Logical().Write(path, map[string]interface{}{
"common_name": fqdn,
"ttl": cfg.CertTTL.String(),
})
if err != nil {
return nil, err
}
if secret.Data == nil {
return nil, errors.New("Got no data from backend")
}
log.WithFields(log.Fields{
"cn": fqdn,
"serial": secret.Data["serial_number"].(string),
}).Debug("Generated new certificate")
return &templateVars{
Certificate: secret.Data["certificate"].(string),
PrivateKey: secret.Data["private_key"].(string),
}, nil
cmd.Execute(version)
}