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package auth
import (
"crypto/subtle"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/sftpd/user"
"golang.org/x/crypto/ssh"
)
// PublicKeyAuthenticator handles public key-based authentication
type PublicKeyAuthenticator struct {
userStore user.Store
enabled bool
}
// NewPublicKeyAuthenticator creates a new public key authenticator
func NewPublicKeyAuthenticator(userStore user.Store, enabled bool) *PublicKeyAuthenticator {
return &PublicKeyAuthenticator{
userStore: userStore,
enabled: enabled,
}
}
// Enabled returns whether public key authentication is enabled
func (a *PublicKeyAuthenticator) Enabled() bool {
return a.enabled
}
// Authenticate validates a public key for a user
func (a *PublicKeyAuthenticator) Authenticate(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
username := conn.User()
// Check if public key auth is enabled
if !a.enabled {
return nil, fmt.Errorf("public key authentication disabled")
}
// Convert key to string format for comparison
keyData := string(key.Marshal())
// Validate public key
if ValidatePublicKey(a.userStore, username, keyData) {
return &ssh.Permissions{
Extensions: map[string]string{
"username": username,
},
}, nil
}
return nil, fmt.Errorf("authentication failed")
}
// ValidatePublicKey checks if the provided public key is valid for the user
func ValidatePublicKey(store user.Store, username string, keyData string) bool {
user, err := store.GetUser(username)
if err != nil {
return false
}
for _, key := range user.PublicKeys {
if subtle.ConstantTimeCompare([]byte(key), []byte(keyData)) == 1 {
return true
}
}
return false
}
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