mirror of
https://github.com/go-gitea/gitea.git
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242 lines
5.3 KiB
Go
242 lines
5.3 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package agent
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import (
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"bytes"
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"crypto/rand"
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"crypto/subtle"
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"errors"
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"fmt"
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"sync"
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"time"
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"golang.org/x/crypto/ssh"
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)
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type privKey struct {
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signer ssh.Signer
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comment string
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expire *time.Time
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}
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type keyring struct {
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mu sync.Mutex
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keys []privKey
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locked bool
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passphrase []byte
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}
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var errLocked = errors.New("agent: locked")
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// NewKeyring returns an Agent that holds keys in memory. It is safe
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// for concurrent use by multiple goroutines.
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func NewKeyring() Agent {
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return &keyring{}
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}
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// RemoveAll removes all identities.
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func (r *keyring) RemoveAll() error {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.locked {
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return errLocked
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}
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r.keys = nil
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return nil
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}
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// removeLocked does the actual key removal. The caller must already be holding the
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// keyring mutex.
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func (r *keyring) removeLocked(want []byte) error {
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found := false
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for i := 0; i < len(r.keys); {
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if bytes.Equal(r.keys[i].signer.PublicKey().Marshal(), want) {
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found = true
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r.keys[i] = r.keys[len(r.keys)-1]
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r.keys = r.keys[:len(r.keys)-1]
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continue
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} else {
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i++
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}
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}
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if !found {
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return errors.New("agent: key not found")
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}
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return nil
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}
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// Remove removes all identities with the given public key.
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func (r *keyring) Remove(key ssh.PublicKey) error {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.locked {
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return errLocked
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}
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return r.removeLocked(key.Marshal())
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}
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// Lock locks the agent. Sign and Remove will fail, and List will return an empty list.
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func (r *keyring) Lock(passphrase []byte) error {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.locked {
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return errLocked
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}
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r.locked = true
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r.passphrase = passphrase
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return nil
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}
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// Unlock undoes the effect of Lock
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func (r *keyring) Unlock(passphrase []byte) error {
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r.mu.Lock()
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defer r.mu.Unlock()
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if !r.locked {
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return errors.New("agent: not locked")
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}
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if 1 != subtle.ConstantTimeCompare(passphrase, r.passphrase) {
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return fmt.Errorf("agent: incorrect passphrase")
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}
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r.locked = false
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r.passphrase = nil
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return nil
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}
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// expireKeysLocked removes expired keys from the keyring. If a key was added
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// with a lifetimesecs contraint and seconds >= lifetimesecs seconds have
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// ellapsed, it is removed. The caller *must* be holding the keyring mutex.
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func (r *keyring) expireKeysLocked() {
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for _, k := range r.keys {
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if k.expire != nil && time.Now().After(*k.expire) {
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r.removeLocked(k.signer.PublicKey().Marshal())
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}
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}
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}
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// List returns the identities known to the agent.
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func (r *keyring) List() ([]*Key, error) {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.locked {
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// section 2.7: locked agents return empty.
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return nil, nil
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}
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r.expireKeysLocked()
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var ids []*Key
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for _, k := range r.keys {
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pub := k.signer.PublicKey()
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ids = append(ids, &Key{
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Format: pub.Type(),
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Blob: pub.Marshal(),
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Comment: k.comment})
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}
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return ids, nil
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}
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// Insert adds a private key to the keyring. If a certificate
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// is given, that certificate is added as public key. Note that
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// any constraints given are ignored.
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func (r *keyring) Add(key AddedKey) error {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.locked {
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return errLocked
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}
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signer, err := ssh.NewSignerFromKey(key.PrivateKey)
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if err != nil {
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return err
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}
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if cert := key.Certificate; cert != nil {
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signer, err = ssh.NewCertSigner(cert, signer)
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if err != nil {
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return err
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}
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}
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p := privKey{
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signer: signer,
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comment: key.Comment,
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}
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if key.LifetimeSecs > 0 {
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t := time.Now().Add(time.Duration(key.LifetimeSecs) * time.Second)
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p.expire = &t
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}
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r.keys = append(r.keys, p)
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return nil
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}
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// Sign returns a signature for the data.
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func (r *keyring) Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error) {
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return r.SignWithFlags(key, data, 0)
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}
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func (r *keyring) SignWithFlags(key ssh.PublicKey, data []byte, flags SignatureFlags) (*ssh.Signature, error) {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.locked {
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return nil, errLocked
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}
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r.expireKeysLocked()
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wanted := key.Marshal()
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for _, k := range r.keys {
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if bytes.Equal(k.signer.PublicKey().Marshal(), wanted) {
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if flags == 0 {
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return k.signer.Sign(rand.Reader, data)
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} else {
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if algorithmSigner, ok := k.signer.(ssh.AlgorithmSigner); !ok {
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return nil, fmt.Errorf("agent: signature does not support non-default signature algorithm: %T", k.signer)
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} else {
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var algorithm string
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switch flags {
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case SignatureFlagRsaSha256:
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algorithm = ssh.SigAlgoRSASHA2256
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case SignatureFlagRsaSha512:
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algorithm = ssh.SigAlgoRSASHA2512
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default:
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return nil, fmt.Errorf("agent: unsupported signature flags: %d", flags)
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}
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return algorithmSigner.SignWithAlgorithm(rand.Reader, data, algorithm)
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}
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}
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}
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}
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return nil, errors.New("not found")
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}
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// Signers returns signers for all the known keys.
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func (r *keyring) Signers() ([]ssh.Signer, error) {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.locked {
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return nil, errLocked
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}
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r.expireKeysLocked()
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s := make([]ssh.Signer, 0, len(r.keys))
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for _, k := range r.keys {
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s = append(s, k.signer)
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}
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return s, nil
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}
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// The keyring does not support any extensions
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func (r *keyring) Extension(extensionType string, contents []byte) ([]byte, error) {
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return nil, ErrExtensionUnsupported
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}
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