mirror of
https://github.com/drakkan/sftpgo.git
synced 2024-11-22 23:50:32 +00:00
612 lines
20 KiB
Go
612 lines
20 KiB
Go
// Copyright (C) 2019-2023 Nicola Murino
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published
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// by the Free Software Foundation, version 3.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package sftpd
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import (
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"crypto/md5"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"errors"
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"fmt"
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"hash"
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"io"
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"os"
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"os/exec"
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"path"
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"runtime/debug"
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"strings"
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"sync"
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"time"
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"github.com/google/shlex"
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"github.com/sftpgo/sdk"
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"golang.org/x/crypto/ssh"
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"github.com/drakkan/sftpgo/v2/internal/common"
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"github.com/drakkan/sftpgo/v2/internal/dataprovider"
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"github.com/drakkan/sftpgo/v2/internal/logger"
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"github.com/drakkan/sftpgo/v2/internal/metric"
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"github.com/drakkan/sftpgo/v2/internal/util"
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"github.com/drakkan/sftpgo/v2/internal/vfs"
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)
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const (
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scpCmdName = "scp"
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sshCommandLogSender = "SSHCommand"
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)
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var (
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errUnsupportedConfig = errors.New("command unsupported for this configuration")
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)
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type sshCommand struct {
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command string
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args []string
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connection *Connection
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startTime time.Time
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}
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type systemCommand struct {
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cmd *exec.Cmd
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fsPath string
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quotaCheckPath string
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fs vfs.Fs
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}
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func (c *systemCommand) GetSTDs() (io.WriteCloser, io.ReadCloser, io.ReadCloser, error) {
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stdin, err := c.cmd.StdinPipe()
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if err != nil {
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return nil, nil, nil, err
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}
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stdout, err := c.cmd.StdoutPipe()
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if err != nil {
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stdin.Close()
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return nil, nil, nil, err
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}
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stderr, err := c.cmd.StderrPipe()
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if err != nil {
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stdin.Close()
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stdout.Close()
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return nil, nil, nil, err
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}
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return stdin, stdout, stderr, nil
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}
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func processSSHCommand(payload []byte, connection *Connection, enabledSSHCommands []string) bool {
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var msg sshSubsystemExecMsg
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if err := ssh.Unmarshal(payload, &msg); err == nil {
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name, args, err := parseCommandPayload(msg.Command)
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connection.Log(logger.LevelDebug, "new ssh command: %q args: %v num args: %d user: %s, error: %v",
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name, args, len(args), connection.User.Username, err)
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if err == nil && util.Contains(enabledSSHCommands, name) {
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connection.command = msg.Command
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if name == scpCmdName && len(args) >= 2 {
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connection.SetProtocol(common.ProtocolSCP)
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scpCommand := scpCommand{
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sshCommand: sshCommand{
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command: name,
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connection: connection,
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startTime: time.Now(),
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args: args},
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}
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go scpCommand.handle() //nolint:errcheck
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return true
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}
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if name != scpCmdName {
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connection.SetProtocol(common.ProtocolSSH)
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sshCommand := sshCommand{
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command: name,
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connection: connection,
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startTime: time.Now(),
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args: args,
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}
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go sshCommand.handle() //nolint:errcheck
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return true
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}
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} else {
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connection.Log(logger.LevelInfo, "ssh command not enabled/supported: %q", name)
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}
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}
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err := connection.CloseFS()
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connection.Log(logger.LevelError, "unable to unmarshal ssh command, close fs, err: %v", err)
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return false
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}
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func (c *sshCommand) handle() (err error) {
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defer func() {
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if r := recover(); r != nil {
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logger.Error(logSender, "", "panic in handle ssh command: %q stack trace: %v", r, string(debug.Stack()))
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err = common.ErrGenericFailure
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}
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}()
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if err := common.Connections.Add(c.connection); err != nil {
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logger.Info(logSender, "", "unable to add SSH command connection: %v", err)
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return err
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}
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defer common.Connections.Remove(c.connection.GetID())
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c.connection.UpdateLastActivity()
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if util.Contains(sshHashCommands, c.command) {
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return c.handleHashCommands()
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} else if util.Contains(systemCommands, c.command) {
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command, err := c.getSystemCommand()
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if err != nil {
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return c.sendErrorResponse(err)
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}
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return c.executeSystemCommand(command)
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} else if c.command == "cd" {
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c.sendExitStatus(nil)
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} else if c.command == "pwd" {
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// hard coded response to the start directory
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c.connection.channel.Write([]byte(util.CleanPath(c.connection.User.Filters.StartDirectory) + "\n")) //nolint:errcheck
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c.sendExitStatus(nil)
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} else if c.command == "sftpgo-copy" {
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return c.handleSFTPGoCopy()
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} else if c.command == "sftpgo-remove" {
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return c.handleSFTPGoRemove()
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}
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return
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}
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func (c *sshCommand) handleSFTPGoCopy() error {
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sshSourcePath := c.getSourcePath()
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sshDestPath := c.getDestPath()
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if sshSourcePath == "" || sshDestPath == "" || len(c.args) != 2 {
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return c.sendErrorResponse(errors.New("usage sftpgo-copy <source dir path> <destination dir path>"))
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}
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c.connection.Log(logger.LevelDebug, "requested copy %q -> %q", sshSourcePath, sshDestPath)
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if err := c.connection.Copy(sshSourcePath, sshDestPath); err != nil {
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return c.sendErrorResponse(err)
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}
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c.connection.channel.Write([]byte("OK\n")) //nolint:errcheck
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c.sendExitStatus(nil)
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return nil
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}
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func (c *sshCommand) handleSFTPGoRemove() error {
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sshDestPath, err := c.getRemovePath()
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if err != nil {
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return c.sendErrorResponse(err)
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}
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if err := c.connection.RemoveAll(sshDestPath); err != nil {
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return c.sendErrorResponse(err)
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}
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c.connection.channel.Write([]byte("OK\n")) //nolint:errcheck
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c.sendExitStatus(nil)
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return nil
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}
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func (c *sshCommand) updateQuota(sshDestPath string, filesNum int, filesSize int64) {
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vfolder, err := c.connection.User.GetVirtualFolderForPath(sshDestPath)
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if err == nil {
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dataprovider.UpdateVirtualFolderQuota(&vfolder.BaseVirtualFolder, filesNum, filesSize, false) //nolint:errcheck
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if vfolder.IsIncludedInUserQuota() {
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dataprovider.UpdateUserQuota(&c.connection.User, filesNum, filesSize, false) //nolint:errcheck
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}
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} else {
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dataprovider.UpdateUserQuota(&c.connection.User, filesNum, filesSize, false) //nolint:errcheck
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}
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}
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func (c *sshCommand) handleHashCommands() error {
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var h hash.Hash
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if c.command == "md5sum" {
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h = md5.New()
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} else if c.command == "sha1sum" {
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h = sha1.New()
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} else if c.command == "sha256sum" {
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h = sha256.New()
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} else if c.command == "sha384sum" {
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h = sha512.New384()
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} else {
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h = sha512.New()
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}
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var response string
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if len(c.args) == 0 {
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// without args we need to read the string to hash from stdin
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buf := make([]byte, 4096)
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n, err := c.connection.channel.Read(buf)
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if err != nil && err != io.EOF {
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return c.sendErrorResponse(err)
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}
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h.Write(buf[:n]) //nolint:errcheck
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response = fmt.Sprintf("%x -\n", h.Sum(nil))
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} else {
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sshPath := c.getDestPath()
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if ok, policy := c.connection.User.IsFileAllowed(sshPath); !ok {
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c.connection.Log(logger.LevelInfo, "hash not allowed for file %q", sshPath)
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return c.sendErrorResponse(c.connection.GetErrorForDeniedFile(policy))
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}
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fs, fsPath, err := c.connection.GetFsAndResolvedPath(sshPath)
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if err != nil {
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return c.sendErrorResponse(err)
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}
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if !c.connection.User.HasPerm(dataprovider.PermListItems, sshPath) {
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return c.sendErrorResponse(c.connection.GetPermissionDeniedError())
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}
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hash, err := c.computeHashForFile(fs, h, fsPath)
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if err != nil {
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return c.sendErrorResponse(c.connection.GetFsError(fs, err))
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}
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response = fmt.Sprintf("%v %v\n", hash, sshPath)
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}
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c.connection.channel.Write([]byte(response)) //nolint:errcheck
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c.sendExitStatus(nil)
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return nil
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}
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func (c *sshCommand) executeSystemCommand(command systemCommand) error {
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sshDestPath := c.getDestPath()
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if !c.isLocalPath(sshDestPath) {
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return c.sendErrorResponse(errUnsupportedConfig)
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}
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diskQuota, transferQuota := c.connection.HasSpace(true, false, command.quotaCheckPath)
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if !diskQuota.HasSpace || !transferQuota.HasUploadSpace() || !transferQuota.HasDownloadSpace() {
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return c.sendErrorResponse(common.ErrQuotaExceeded)
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}
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perms := []string{dataprovider.PermDownload, dataprovider.PermUpload, dataprovider.PermCreateDirs, dataprovider.PermListItems,
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dataprovider.PermOverwrite, dataprovider.PermDelete}
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if !c.connection.User.HasPerms(perms, sshDestPath) {
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return c.sendErrorResponse(c.connection.GetPermissionDeniedError())
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}
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initialFiles, initialSize, err := c.getSizeForPath(command.fs, command.fsPath)
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if err != nil {
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return c.sendErrorResponse(err)
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}
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stdin, stdout, stderr, err := command.GetSTDs()
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if err != nil {
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return c.sendErrorResponse(err)
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}
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err = command.cmd.Start()
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if err != nil {
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return c.sendErrorResponse(err)
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}
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closeCmdOnError := func() {
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c.connection.Log(logger.LevelDebug, "kill cmd: %q and close ssh channel after read or write error",
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c.connection.command)
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killerr := command.cmd.Process.Kill()
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closerr := c.connection.channel.Close()
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c.connection.Log(logger.LevelDebug, "kill cmd error: %v close channel error: %v", killerr, closerr)
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}
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var once sync.Once
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commandResponse := make(chan bool)
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remainingQuotaSize := diskQuota.GetRemainingSize()
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go func() {
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defer stdin.Close()
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baseTransfer := common.NewBaseTransfer(nil, c.connection.BaseConnection, nil, command.fsPath, command.fsPath, sshDestPath,
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common.TransferUpload, 0, 0, remainingQuotaSize, 0, false, command.fs, transferQuota)
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transfer := newTransfer(baseTransfer, nil, nil, nil)
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w, e := transfer.copyFromReaderToWriter(stdin, c.connection.channel)
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c.connection.Log(logger.LevelDebug, "command: %q, copy from remote command to sdtin ended, written: %v, "+
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"initial remaining quota: %v, err: %v", c.connection.command, w, remainingQuotaSize, e)
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if e != nil {
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once.Do(closeCmdOnError)
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}
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}()
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go func() {
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baseTransfer := common.NewBaseTransfer(nil, c.connection.BaseConnection, nil, command.fsPath, command.fsPath, sshDestPath,
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common.TransferDownload, 0, 0, 0, 0, false, command.fs, transferQuota)
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transfer := newTransfer(baseTransfer, nil, nil, nil)
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w, e := transfer.copyFromReaderToWriter(c.connection.channel, stdout)
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c.connection.Log(logger.LevelDebug, "command: %q, copy from sdtout to remote command ended, written: %v err: %v",
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c.connection.command, w, e)
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if e != nil {
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once.Do(closeCmdOnError)
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}
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commandResponse <- true
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}()
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go func() {
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baseTransfer := common.NewBaseTransfer(nil, c.connection.BaseConnection, nil, command.fsPath, command.fsPath, sshDestPath,
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common.TransferDownload, 0, 0, 0, 0, false, command.fs, transferQuota)
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transfer := newTransfer(baseTransfer, nil, nil, nil)
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w, e := transfer.copyFromReaderToWriter(c.connection.channel.(ssh.Channel).Stderr(), stderr)
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c.connection.Log(logger.LevelDebug, "command: %q, copy from sdterr to remote command ended, written: %v err: %v",
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c.connection.command, w, e)
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// os.ErrClosed means that the command is finished so we don't need to do anything
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if (e != nil && !errors.Is(e, os.ErrClosed)) || w > 0 {
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once.Do(closeCmdOnError)
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}
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}()
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<-commandResponse
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err = command.cmd.Wait()
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c.sendExitStatus(err)
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numFiles, dirSize, errSize := c.getSizeForPath(command.fs, command.fsPath)
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if errSize == nil {
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c.updateQuota(sshDestPath, numFiles-initialFiles, dirSize-initialSize)
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}
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c.connection.Log(logger.LevelDebug, "command %q finished for path %q, initial files %v initial size %v "+
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"current files %v current size %v size err: %v", c.connection.command, command.fsPath, initialFiles, initialSize,
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numFiles, dirSize, errSize)
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return c.connection.GetFsError(command.fs, err)
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}
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func (c *sshCommand) isSystemCommandAllowed() error {
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sshDestPath := c.getDestPath()
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if c.connection.User.IsVirtualFolder(sshDestPath) {
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// overlapped virtual path are not allowed
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return nil
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}
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if c.connection.User.HasVirtualFoldersInside(sshDestPath) {
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c.connection.Log(logger.LevelDebug, "command %q is not allowed, path %q has virtual folders inside it, user %q",
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c.command, sshDestPath, c.connection.User.Username)
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return errUnsupportedConfig
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}
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for _, f := range c.connection.User.Filters.FilePatterns {
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if f.Path == sshDestPath {
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c.connection.Log(logger.LevelDebug,
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"command %q is not allowed inside folders with file patterns filters %q user %q",
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c.command, sshDestPath, c.connection.User.Username)
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return errUnsupportedConfig
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}
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if len(sshDestPath) > len(f.Path) {
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if strings.HasPrefix(sshDestPath, f.Path+"/") || f.Path == "/" {
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c.connection.Log(logger.LevelDebug,
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"command %q is not allowed it includes folders with file patterns filters %q user %q",
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c.command, sshDestPath, c.connection.User.Username)
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return errUnsupportedConfig
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}
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}
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if len(sshDestPath) < len(f.Path) {
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if strings.HasPrefix(sshDestPath+"/", f.Path) || sshDestPath == "/" {
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c.connection.Log(logger.LevelDebug,
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"command %q is not allowed inside folder with file patterns filters %q user %q",
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c.command, sshDestPath, c.connection.User.Username)
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return errUnsupportedConfig
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}
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}
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}
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return nil
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}
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func (c *sshCommand) getSystemCommand() (systemCommand, error) {
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command := systemCommand{
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cmd: nil,
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fs: nil,
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fsPath: "",
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quotaCheckPath: "",
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}
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if err := common.CheckClosing(); err != nil {
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return command, err
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}
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args := make([]string, len(c.args))
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copy(args, c.args)
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var fsPath, quotaPath string
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sshPath := c.getDestPath()
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fs, err := c.connection.User.GetFilesystemForPath(sshPath, c.connection.ID)
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if err != nil {
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return command, err
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}
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if len(c.args) > 0 {
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var err error
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fsPath, err = fs.ResolvePath(sshPath)
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if err != nil {
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return command, c.connection.GetFsError(fs, err)
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}
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quotaPath = sshPath
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fi, err := fs.Stat(fsPath)
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if err == nil && fi.IsDir() {
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// if the target is an existing dir the command will write inside this dir
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// so we need to check the quota for this directory and not its parent dir
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quotaPath = path.Join(sshPath, "fakecontent")
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}
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if strings.HasSuffix(sshPath, "/") && !strings.HasSuffix(fsPath, string(os.PathSeparator)) {
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fsPath += string(os.PathSeparator)
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c.connection.Log(logger.LevelDebug, "path separator added to fsPath %q", fsPath)
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}
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args = args[:len(args)-1]
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args = append(args, fsPath)
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}
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if err := c.isSystemCommandAllowed(); err != nil {
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return command, errUnsupportedConfig
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}
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if c.command == "rsync" {
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// we cannot avoid that rsync creates symlinks so if the user has the permission
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// to create symlinks we add the option --safe-links to the received rsync command if
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// it is not already set. This should prevent to create symlinks that point outside
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// the home dir.
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// If the user cannot create symlinks we add the option --munge-links, if it is not
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// already set. This should make symlinks unusable (but manually recoverable)
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if c.connection.User.HasPerm(dataprovider.PermCreateSymlinks, c.getDestPath()) {
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if !util.Contains(args, "--safe-links") {
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args = append([]string{"--safe-links"}, args...)
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}
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} else {
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if !util.Contains(args, "--munge-links") {
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args = append([]string{"--munge-links"}, args...)
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}
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}
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}
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c.connection.Log(logger.LevelDebug, "new system command %q, with args: %+v fs path %q quota check path %q",
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c.command, args, fsPath, quotaPath)
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cmd := exec.Command(c.command, args...)
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uid := c.connection.User.GetUID()
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gid := c.connection.User.GetGID()
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cmd = wrapCmd(cmd, uid, gid)
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command.cmd = cmd
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command.fsPath = fsPath
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command.quotaCheckPath = quotaPath
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command.fs = fs
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return command, nil
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}
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// for the supported commands, the destination path, if any, is the last argument
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func (c *sshCommand) getDestPath() string {
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if len(c.args) == 0 {
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return ""
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}
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return c.cleanCommandPath(c.args[len(c.args)-1])
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}
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// for the supported commands, the destination path, if any, is the second-last argument
|
|
func (c *sshCommand) getSourcePath() string {
|
|
if len(c.args) < 2 {
|
|
return ""
|
|
}
|
|
return c.cleanCommandPath(c.args[len(c.args)-2])
|
|
}
|
|
|
|
func (c *sshCommand) cleanCommandPath(name string) string {
|
|
name = strings.Trim(name, "'")
|
|
name = strings.Trim(name, "\"")
|
|
result := c.connection.User.GetCleanedPath(name)
|
|
if strings.HasSuffix(name, "/") && !strings.HasSuffix(result, "/") {
|
|
result += "/"
|
|
}
|
|
return result
|
|
}
|
|
|
|
func (c *sshCommand) getRemovePath() (string, error) {
|
|
sshDestPath := c.getDestPath()
|
|
if sshDestPath == "" || len(c.args) != 1 {
|
|
err := errors.New("usage sftpgo-remove <destination path>")
|
|
return "", err
|
|
}
|
|
if len(sshDestPath) > 1 {
|
|
sshDestPath = strings.TrimSuffix(sshDestPath, "/")
|
|
}
|
|
return sshDestPath, nil
|
|
}
|
|
|
|
func (c *sshCommand) isLocalPath(virtualPath string) bool {
|
|
folder, err := c.connection.User.GetVirtualFolderForPath(virtualPath)
|
|
if err != nil {
|
|
return c.connection.User.FsConfig.Provider == sdk.LocalFilesystemProvider
|
|
}
|
|
return folder.FsConfig.Provider == sdk.LocalFilesystemProvider
|
|
}
|
|
|
|
func (c *sshCommand) getSizeForPath(fs vfs.Fs, name string) (int, int64, error) {
|
|
if dataprovider.GetQuotaTracking() > 0 {
|
|
fi, err := fs.Lstat(name)
|
|
if err != nil {
|
|
if fs.IsNotExist(err) {
|
|
return 0, 0, nil
|
|
}
|
|
c.connection.Log(logger.LevelDebug, "unable to stat %q error: %v", name, err)
|
|
return 0, 0, err
|
|
}
|
|
if fi.IsDir() {
|
|
files, size, err := fs.GetDirSize(name)
|
|
if err != nil {
|
|
c.connection.Log(logger.LevelDebug, "unable to get size for dir %q error: %v", name, err)
|
|
}
|
|
return files, size, err
|
|
} else if fi.Mode().IsRegular() {
|
|
return 1, fi.Size(), nil
|
|
}
|
|
}
|
|
return 0, 0, nil
|
|
}
|
|
|
|
func (c *sshCommand) sendErrorResponse(err error) error {
|
|
errorString := fmt.Sprintf("%v: %v %v\n", c.command, c.getDestPath(), err)
|
|
c.connection.channel.Write([]byte(errorString)) //nolint:errcheck
|
|
c.sendExitStatus(err)
|
|
return err
|
|
}
|
|
|
|
func (c *sshCommand) sendExitStatus(err error) {
|
|
status := uint32(0)
|
|
vCmdPath := c.getDestPath()
|
|
cmdPath := ""
|
|
targetPath := ""
|
|
vTargetPath := ""
|
|
if c.command == "sftpgo-copy" {
|
|
vTargetPath = vCmdPath
|
|
vCmdPath = c.getSourcePath()
|
|
}
|
|
if err != nil {
|
|
status = uint32(1)
|
|
c.connection.Log(logger.LevelError, "command failed: %q args: %v user: %s err: %v",
|
|
c.command, c.args, c.connection.User.Username, err)
|
|
}
|
|
exitStatus := sshSubsystemExitStatus{
|
|
Status: status,
|
|
}
|
|
_, errClose := c.connection.channel.(ssh.Channel).SendRequest("exit-status", false, ssh.Marshal(&exitStatus))
|
|
c.connection.Log(logger.LevelDebug, "exit status sent, error: %v", errClose)
|
|
c.connection.channel.Close()
|
|
// for scp we notify single uploads/downloads
|
|
if c.command != scpCmdName {
|
|
elapsed := time.Since(c.startTime).Nanoseconds() / 1000000
|
|
metric.SSHCommandCompleted(err)
|
|
if vCmdPath != "" {
|
|
_, p, errFs := c.connection.GetFsAndResolvedPath(vCmdPath)
|
|
if errFs == nil {
|
|
cmdPath = p
|
|
}
|
|
}
|
|
if vTargetPath != "" {
|
|
_, p, errFs := c.connection.GetFsAndResolvedPath(vTargetPath)
|
|
if errFs == nil {
|
|
targetPath = p
|
|
}
|
|
}
|
|
common.ExecuteActionNotification(c.connection.BaseConnection, common.OperationSSHCmd, cmdPath, vCmdPath, //nolint:errcheck
|
|
targetPath, vTargetPath, c.command, 0, err, elapsed)
|
|
if err == nil {
|
|
logger.CommandLog(sshCommandLogSender, cmdPath, targetPath, c.connection.User.Username, "", c.connection.ID,
|
|
common.ProtocolSSH, -1, -1, "", "", c.connection.command, -1, c.connection.GetLocalAddress(),
|
|
c.connection.GetRemoteAddress(), elapsed)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *sshCommand) computeHashForFile(fs vfs.Fs, hasher hash.Hash, path string) (string, error) {
|
|
hash := ""
|
|
f, r, _, err := fs.Open(path, 0)
|
|
if err != nil {
|
|
return hash, err
|
|
}
|
|
var reader io.ReadCloser
|
|
if f != nil {
|
|
reader = f
|
|
} else {
|
|
reader = r
|
|
}
|
|
defer reader.Close()
|
|
_, err = io.Copy(hasher, reader)
|
|
if err == nil {
|
|
hash = fmt.Sprintf("%x", hasher.Sum(nil))
|
|
}
|
|
return hash, err
|
|
}
|
|
|
|
func parseCommandPayload(command string) (string, []string, error) {
|
|
parts, err := shlex.Split(command)
|
|
if err == nil && len(parts) == 0 {
|
|
err = fmt.Errorf("invalid command: %q", command)
|
|
}
|
|
if err != nil {
|
|
return "", []string{}, err
|
|
}
|
|
if len(parts) < 2 {
|
|
return parts[0], []string{}, nil
|
|
}
|
|
return parts[0], parts[1:], nil
|
|
}
|