mirror of
https://github.com/quexten/goldwarden.git
synced 2024-12-13 13:26:16 +01:00
225 lines
6.2 KiB
Go
225 lines
6.2 KiB
Go
package ssh
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import (
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"bytes"
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"crypto/rand"
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"errors"
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"fmt"
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"time"
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"github.com/quexten/goldwarden/cli/agent/config"
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"github.com/quexten/goldwarden/cli/agent/notify"
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"github.com/quexten/goldwarden/cli/agent/sockets"
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"github.com/quexten/goldwarden/cli/agent/systemauth"
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"github.com/quexten/goldwarden/cli/agent/systemauth/pinentry"
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"github.com/quexten/goldwarden/cli/agent/vault"
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"github.com/quexten/goldwarden/cli/logging"
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"golang.org/x/crypto/ssh"
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"golang.org/x/crypto/ssh/agent"
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)
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var log = logging.GetLogger("Goldwarden", "SSH")
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type vaultAgent struct {
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vault *vault.Vault
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config *config.Config
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unlockRequestAction func() bool
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context sockets.CallingContext
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}
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func (vaultAgent) Add(key agent.AddedKey) error {
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log.Warn("Add Request - Not implemented")
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return nil
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}
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func (vaultAgent vaultAgent) List() ([]*agent.Key, error) {
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log.Info("List Request")
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if vaultAgent.vault.Keyring.IsLocked() {
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if !vaultAgent.unlockRequestAction() {
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log.Warn("List request failed - Vault is locked")
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return nil, errors.New("vault is locked")
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}
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systemauth.CreatePinSession(vaultAgent.context, systemauth.SSHTTL)
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}
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vaultSSHKeys := (*vaultAgent.vault).GetSSHKeys()
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var sshKeys []*agent.Key
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for _, vaultSSHKey := range vaultSSHKeys {
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signer, err := ssh.ParsePrivateKey([]byte(vaultSSHKey.Key))
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if err != nil {
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log.Warn("List request key skipped - Could not parse key: %s", err)
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continue
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}
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pub := signer.PublicKey()
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sshKeys = append(sshKeys, &agent.Key{
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Format: pub.Type(),
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Blob: pub.Marshal(),
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Comment: vaultSSHKey.Name})
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}
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return sshKeys, nil
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}
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func (vaultAgent) Lock(passphrase []byte) error {
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log.Warn("Lock Request - Not implemented")
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return nil
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}
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func (vaultAgent) Remove(key ssh.PublicKey) error {
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log.Warn("Remove Request - Not implemented")
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return nil
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}
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func (vaultAgent) RemoveAll() error {
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log.Warn("RemoveAll Request - Not implemented")
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return nil
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}
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func Eq(a, b ssh.PublicKey) bool {
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return 0 == bytes.Compare(a.Marshal(), b.Marshal())
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}
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func (vaultAgent vaultAgent) Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error) {
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return vaultAgent.SignWithFlags(key, data, agent.SignatureFlagReserved)
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}
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func (vaultAgent vaultAgent) SignWithFlags(key ssh.PublicKey, data []byte, flags agent.SignatureFlags) (*ssh.Signature, error) {
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log.Info("Sign Request for key: %s", ssh.FingerprintSHA256(key))
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if vaultAgent.vault.Keyring.IsLocked() {
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if !vaultAgent.unlockRequestAction() {
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return nil, errors.New("vault is locked")
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}
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systemauth.CreatePinSession(vaultAgent.context, systemauth.SSHTTL)
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}
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var signer ssh.Signer
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var sshKey *vault.SSHKey
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vaultSSHKeys := (*vaultAgent.vault).GetSSHKeys()
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for _, vaultSSHKey := range vaultSSHKeys {
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sg, err := ssh.ParsePrivateKey([]byte(vaultSSHKey.Key))
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if err != nil {
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return nil, err
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}
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if Eq(sg.PublicKey(), key) {
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signer = sg
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sshKey = &vaultSSHKey
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break
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}
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}
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if sshKey == nil {
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return nil, errors.New("key not found")
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}
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isGit := false
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magicHeader := []byte("SSHSIG\x00\x00\x00\x03git")
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if bytes.HasPrefix(data, magicHeader) {
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isGit = true
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}
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requestTemplate := ""
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message := ""
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if !vaultAgent.context.Error {
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if isGit {
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requestTemplate = "%s on %s>%s>%s is requesting git signage with key %s"
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} else {
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requestTemplate = "%s on %s>%s>%s is requesting ssh signage with key %s"
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}
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message = fmt.Sprintf(requestTemplate, vaultAgent.context.UserName, vaultAgent.context.GrandParentProcessName, vaultAgent.context.ParentProcessName, vaultAgent.context.ProcessName, sshKey.Name)
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} else {
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if isGit {
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requestTemplate = "%s is requesting git signage with key %s"
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} else {
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requestTemplate = "%s is requesting ssh signage with key %s"
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}
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message = fmt.Sprintf(requestTemplate, vaultAgent.context.UserName, sshKey.Name)
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}
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// todo refactor
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if !systemauth.GetSSHSession(vaultAgent.context) {
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if approved, err := pinentry.GetApproval("SSH Key Signing Request", message); err != nil || !approved {
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log.Info("Sign Request for key: %s denied", sshKey.Name)
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return nil, errors.New("Approval not given")
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}
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if !systemauth.VerifyPinSession(vaultAgent.context) {
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if permission, err := systemauth.GetPermission(systemauth.SSHKey, vaultAgent.context, vaultAgent.config); err != nil || !permission {
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log.Info("Sign Request for key: %s denied", key.Marshal())
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return nil, errors.New("Biometrics not checked")
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}
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}
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systemauth.CreateSSHSession(vaultAgent.context)
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} else {
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log.Info("Using cached session approval")
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}
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var rand = rand.Reader
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log.Info("Sign Request for key: %s %s accepted", ssh.FingerprintSHA256(key), sshKey.Name)
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if isGit {
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notify.Notify("Goldwarden", fmt.Sprintf("Git Signing Request Approved for %s", sshKey.Name), "", 10*time.Second, func() {})
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} else {
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notify.Notify("Goldwarden", fmt.Sprintf("SSH Signing Request Approved for %s", sshKey.Name), "", 10*time.Second, func() {})
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}
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algo := ""
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switch flags {
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case agent.SignatureFlagRsaSha256:
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algo = ssh.KeyAlgoRSASHA256
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case agent.SignatureFlagRsaSha512:
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algo = ssh.KeyAlgoRSASHA512
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default:
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return signer.Sign(rand, data)
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}
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log.Info("%s algorithm requested", algo)
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algoSigner, err := ssh.NewSignerWithAlgorithms(signer.(ssh.AlgorithmSigner), []string{algo})
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if err != nil {
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return nil, err
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}
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return algoSigner.SignWithAlgorithm(rand, data, algo)
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}
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func (vaultAgent) Extension(extensionType string, contents []byte) ([]byte, error) {
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return nil, agent.ErrExtensionUnsupported
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}
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func (vaultAgent) Signers() ([]ssh.Signer, error) {
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log.Warn("Signers Request - Not implemented")
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return []ssh.Signer{}, nil
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}
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func (vaultAgent) Unlock(passphrase []byte) error {
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log.Warn("Unlock Request - Not implemented")
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return nil
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}
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type SSHAgentServer struct {
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vault *vault.Vault
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config *config.Config
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runtimeConfig *config.RuntimeConfig
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unlockRequestAction func() bool
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}
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func (v *SSHAgentServer) SetUnlockRequestAction(action func() bool) {
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v.unlockRequestAction = action
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}
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func NewVaultAgent(vault *vault.Vault, config *config.Config, runtimeConfig *config.RuntimeConfig) SSHAgentServer {
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return SSHAgentServer{
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vault: vault,
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config: config,
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runtimeConfig: runtimeConfig,
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unlockRequestAction: func() bool {
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log.Info("Unlock Request, but no action defined")
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return false
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},
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}
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}
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