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sftpfs: cache and reuse parsed private keys

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Signed-off-by: Nicola Murino <nicola.murino@gmail.com>
This commit is contained in:
Nicola Murino 2024-07-16 19:20:28 +02:00
parent fef388d8cb
commit 99f47ca4e7
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GPG key ID: 935D2952DEC4EECF
1 changed files with 40 additions and 38 deletions
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78
internal/vfs/sftpfs.go
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@ -69,6 +69,17 @@ type SFTPFsConfig struct {
forbiddenSelfUsernames []string `json:"-"`
}
func (c *SFTPFsConfig) getKeySigner() (ssh.Signer, error) {
privPayload := c.PrivateKey.GetPayload()
if privPayload == "" {
return nil, nil
}
if key := c.KeyPassphrase.GetPayload(); key != "" {
return ssh.ParsePrivateKeyWithPassphrase([]byte(privPayload), []byte(key))
}
return ssh.ParsePrivateKey([]byte(privPayload))
}
// HideConfidentialData hides confidential data
func (c *SFTPFsConfig) HideConfidentialData() {
if c.Password != nil {
@ -185,25 +196,20 @@ func (c *SFTPFsConfig) validate() error {
func (c *SFTPFsConfig) validatePrivateKey() error {
if c.PrivateKey.IsPlain() {
var signer ssh.Signer
var err error
if c.KeyPassphrase.IsPlain() {
signer, err = ssh.ParsePrivateKeyWithPassphrase([]byte(c.PrivateKey.GetPayload()),
[]byte(c.KeyPassphrase.GetPayload()))
} else {
signer, err = ssh.ParsePrivateKey([]byte(c.PrivateKey.GetPayload()))
}
signer, err := c.getKeySigner()
if err != nil {
return util.NewI18nError(fmt.Errorf("invalid private key: %w", err), util.I18nErrorPrivKeyInvalid)
}
if key, ok := signer.PublicKey().(ssh.CryptoPublicKey); ok {
cryptoKey := key.CryptoPublicKey()
if rsaKey, ok := cryptoKey.(*rsa.PublicKey); ok {
if size := rsaKey.N.BitLen(); size < 2048 {
return util.NewI18nError(
fmt.Errorf("rsa key with size %d not accepted, minimum 2048", size),
util.I18nErrorKeySizeInvalid,
)
if signer != nil {
if key, ok := signer.PublicKey().(ssh.CryptoPublicKey); ok {
cryptoKey := key.CryptoPublicKey()
if rsaKey, ok := cryptoKey.(*rsa.PublicKey); ok {
if size := rsaKey.N.BitLen(); size < 2048 {
return util.NewI18nError(
fmt.Errorf("rsa key with size %d not accepted, minimum 2048", size),
util.I18nErrorKeySizeInvalid,
)
}
}
}
}
@ -331,15 +337,19 @@ func NewSFTPFs(connectionID, mountPath, localTempDir string, forbiddenSelfUserna
return nil, err
}
}
conn, err := sftpConnsCache.Get(&config, connectionID)
if err != nil {
return nil, err
}
config.forbiddenSelfUsernames = forbiddenSelfUsernames
sftpFs := &SFTPFs{
connectionID: connectionID,
mountPath: getMountPath(mountPath),
localTempDir: localTempDir,
config: &config,
conn: sftpConnsCache.Get(&config, connectionID),
conn: conn,
}
err := sftpFs.createConnection()
err = sftpFs.createConnection()
if err != nil {
sftpFs.Close() //nolint:errcheck
}
@ -910,6 +920,7 @@ type sftpConnection struct {
isConnected bool
sessions map[string]bool
lastActivity time.Time
signer ssh.Signer
}
func newSFTPConnection(config *SFTPFsConfig, sessionID string) *sftpConnection {
@ -919,6 +930,7 @@ func newSFTPConnection(config *SFTPFsConfig, sessionID string) *sftpConnection {
isConnected: false,
sessions: map[string]bool{},
lastActivity: time.Now().UTC(),
signer: nil,
}
c.sessions[sessionID] = true
return c
@ -931,17 +943,6 @@ func (c *sftpConnection) OpenConnection() error {
return c.openConnNoLock()
}
func (c *sftpConnection) getKeySigner() (ssh.Signer, error) {
privPayload := c.config.PrivateKey.GetPayload()
if privPayload == "" {
return nil, nil
}
if key := c.config.KeyPassphrase.GetPayload(); key != "" {
return ssh.ParsePrivateKeyWithPassphrase([]byte(privPayload), []byte(key))
}
return ssh.ParsePrivateKey([]byte(privPayload))
}
func (c *sftpConnection) openConnNoLock() error {
if c.isConnected {
logger.Debug(c.logSender, "", "reusing connection")
@ -979,12 +980,8 @@ func (c *sftpConnection) openConnNoLock() error {
Timeout: 15 * time.Second,
ClientVersion: fmt.Sprintf("SSH-2.0-%s", version.GetServerVersion("_", false)),
}
signer, err := c.getKeySigner()
if err != nil {
return fmt.Errorf("sftpfs: unable to parse the private key: %w", err)
}
if signer != nil {
clientConfig.Auth = append(clientConfig.Auth, ssh.PublicKeys(signer))
if c.signer != nil {
clientConfig.Auth = append(clientConfig.Auth, ssh.PublicKeys(c.signer))
}
if pwd := c.config.Password.GetPayload(); pwd != "" {
clientConfig.Auth = append(clientConfig.Auth, ssh.Password(pwd))
@ -1156,7 +1153,7 @@ func newSFTPConnectionCache() *sftpConnectionsCache {
return c
}
func (c *sftpConnectionsCache) Get(config *SFTPFsConfig, sessionID string) *sftpConnection {
func (c *sftpConnectionsCache) Get(config *SFTPFsConfig, sessionID string) (*sftpConnection, error) {
partition := 0
key := config.getUniqueID(partition)
@ -1172,7 +1169,7 @@ func (c *sftpConnectionsCache) Get(config *SFTPFsConfig, sessionID string) *sftp
"reusing connection for session ID %q, key: %d, active sessions %d, active connections: %d",
sessionID, key, activeSessions+1, len(c.items))
val.AddSession(sessionID)
return val
return val, nil
}
partition++
oldKey = key
@ -1182,11 +1179,16 @@ func (c *sftpConnectionsCache) Get(config *SFTPFsConfig, sessionID string) *sftp
partition, activeSessions, oldKey, key)
} else {
conn := newSFTPConnection(config, sessionID)
signer, err := config.getKeySigner()
if err != nil {
return nil, fmt.Errorf("sftpfs: unable to parse the private key: %w", err)
}
conn.signer = signer
c.items[key] = conn
logger.Debug(logSenderSFTPCache, "",
"adding new connection for session ID %q, partition: %d, key: %d, active connections: %d",
sessionID, partition, key, len(c.items))
return conn
return conn, nil
}
}
}