├── COPYING ├── MANIFEST.in ├── NEWS ├── README ├── authconfig.ini.example ├── gen-server-keys.py ├── pysftpd.ini.example ├── setup.py ├── sftp-server.py └── sftpd ├── Authorization.py ├── CLI.py ├── Configuration.py ├── SFTPServer.py ├── SFTPServerInterface.py ├── __init__.py └── errors.py /COPYING: -------------------------------------------------------------------------------- 1 | 2 | GNU GENERAL PUBLIC LICENSE 3 | Version 3, 29 June 2007 4 | 5 | Copyright (C) 2007 Free Software Foundation, Inc. 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The GNU General Public License is a free, copyleft license for 12 | software and other kinds of works. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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It is safest 631 | to attach them to the start of each source file to most effectively 632 | state the exclusion of warranty; and each file should have at least 633 | the "copyright" line and a pointer to where the full notice is found. 634 | 635 | 636 | Copyright (C) 637 | 638 | This program is free software: you can redistribute it and/or modify 639 | it under the terms of the GNU General Public License as published by 640 | the Free Software Foundation, either version 3 of the License, or 641 | (at your option) any later version. 642 | 643 | This program is distributed in the hope that it will be useful, 644 | but WITHOUT ANY WARRANTY; without even the implied warranty of 645 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 646 | GNU General Public License for more details. 647 | 648 | You should have received a copy of the GNU General Public License 649 | along with this program. If not, see . 650 | 651 | Also add information on how to contact you by electronic and paper mail. 652 | 653 | If the program does terminal interaction, make it output a short 654 | notice like this when it starts in an interactive mode: 655 | 656 | Copyright (C) 657 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 658 | This is free software, and you are welcome to redistribute it 659 | under certain conditions; type `show c' for details. 660 | 661 | The hypothetical commands `show w' and `show c' should show the appropriate 662 | parts of the General Public License. Of course, your program's commands 663 | might be different; for a GUI interface, you would use an "about box". 664 | 665 | You should also get your employer (if you work as a programmer) or school, 666 | if any, to sign a "copyright disclaimer" for the program, if necessary. 667 | For more information on this, and how to apply and follow the GNU GPL, see 668 | . 669 | 670 | The GNU General Public License does not permit incorporating your program 671 | into proprietary programs. If your program is a subroutine library, you 672 | may consider it more useful to permit linking proprietary applications with 673 | the library. If this is what you want to do, use the GNU Lesser General 674 | Public License instead of this License. But first, please read 675 | . 676 | 677 | -------------------------------------------------------------------------------- /MANIFEST.in: -------------------------------------------------------------------------------- 1 | include README COPYING NEWS sftp-server.py gen-server-keys.py authconfig.ini.example pysftpd.ini.example 2 | -------------------------------------------------------------------------------- /NEWS: -------------------------------------------------------------------------------- 1 | ==== 2 | NEWS 3 | ==== 4 | 5 | Highlights of what's new in each release: 6 | 7 | 8 | Releases 9 | ~~~~~~~~ 10 | 11 | v0.1.0 2008-03-02 12 | ----------------- 13 | * Initial release. 14 | 15 | -------------------------------------------------------------------------------- /README: -------------------------------------------------------------------------------- 1 | *********** 2 | * PySFTPd * 3 | *********** 4 | 5 | Author: Dwayne C. Litzenberger 6 | Homepage: http://www.dlitz.net/software/pysftpd/ 7 | 8 | PySFTPd is an SFTP server implementation that builds upon Robey Pointer's 9 | paramiko secure shell library. 10 | 11 | Note: At this time, PySFTPd supports only read-only operation, though you can 12 | extend it to support read-write operations if you wish. 13 | 14 | 15 | Copyright: 16 | ~~~~~~~~~~ 17 | Copyright (C) 2007-2008 Dwayne C. Litzenberger 18 | 19 | PySFTPd is free software: you can redistribute it and/or modify it under the 20 | terms of the GNU General Public License as published by the Free Software 21 | Foundation, either version 3 of the License, or (at your option) any later 22 | version. 23 | 24 | PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 25 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 26 | A PARTICULAR PURPOSE. See the GNU General Public License for more details. 27 | 28 | You should have received a copy of the GNU General Public License along with 29 | this program. If not, see . 30 | 31 | 32 | Revision History: 33 | ~~~~~~~~~~~~~~~~~ 34 | See the file NEWS for details. 35 | 36 | 37 | Quick Start: 38 | ~~~~~~~~~~~~ 39 | 1. Unpack the source distribution. 40 | 41 | 2. Generate SSH server keys "server_rsa_key" and "server_dss_key" 42 | 43 | ./gen-server-keys.py 44 | 45 | 3. Copy pysftpd.ini.example to pysftpd.ini and edit it to suit your needs. 46 | 47 | 4. Copy authconfig.ini.example to authconfig.ini and edit it to suit your 48 | needs. 49 | 50 | 5. Read the usage info for PySFTPd 51 | 52 | ./sftp-server.py --help 53 | 54 | 5. Start PySFTPd 55 | 56 | ./sftp-server.py -c pysftpd.ini 57 | 58 | -------------------------------------------------------------------------------- /authconfig.ini.example: -------------------------------------------------------------------------------- 1 | [anonymous] 2 | anonymous = true 3 | root_path = /var/ftpd 4 | 5 | [dwon] 6 | password = $1$XXXXXXXX$oqV205xSKMnljqNTxnZaP. 7 | root_path = / 8 | authorized_keys_file = /home/dwon/.ssh/authorized_keys 9 | -------------------------------------------------------------------------------- /gen-server-keys.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | import sys 20 | import os 21 | import paramiko 22 | 23 | rsa_bits = 3072 24 | dss_bits = 1024 25 | 26 | rsa_key_filename = "server_rsa_key" 27 | dss_key_filename = "server_dss_key" 28 | 29 | def show_progress(s): 30 | sys.stdout.write("... " + s) 31 | sys.stdout.flush() 32 | 33 | def main(): 34 | status = 0 35 | 36 | if os.path.exists(rsa_key_filename): 37 | print >>sys.stderr, "%s already exists. Not generating RSA host key." % (rsa_key_filename,) 38 | status = 2 39 | elif os.path.exists(rsa_key_filename + ".pub"): 40 | print >>sys.stderr, "%s already exists. Not generating RSA host key." % (rsa_key_filename + ".pub",) 41 | status = 2 42 | else: 43 | print "Generating %d-bit RSA host key..." % (rsa_bits,) 44 | rsa_key = paramiko.RSAKey.generate(bits=rsa_bits, progress_func=show_progress) 45 | print "... Writing %s" % (rsa_key_filename,) 46 | rsa_key.write_private_key_file(rsa_key_filename) 47 | print "... Writing %s" % (rsa_key_filename + ".pub",) 48 | open(rsa_key_filename + ".pub", "w").write("%s %s\n" % (rsa_key.get_name(), rsa_key.get_base64())) 49 | del rsa_key 50 | print "... done!" 51 | 52 | if os.path.exists(dss_key_filename): 53 | print >>sys.stderr, "%s already exists. Not generating DSS host key." % (dss_key_filename,) 54 | status = 2 55 | elif os.path.exists(dss_key_filename + ".pub"): 56 | print >>sys.stderr, "%s already exists. Not generating DSS host key." % (dss_key_filename + ".pub",) 57 | status = 2 58 | else: 59 | print "Generating %d-bit RSA host key..." % (dss_bits,) 60 | dss_key = paramiko.DSSKey.generate(bits=dss_bits, progress_func=show_progress) 61 | print "... Writing %s" % (dss_key_filename,) 62 | dss_key.write_private_key_file(dss_key_filename) 63 | print "... Writing %s" % (dss_key_filename + ".pub",) 64 | open(dss_key_filename + ".pub", "w").write("%s %s\n" % (dss_key.get_name(), dss_key.get_base64())) 65 | del dss_key 66 | print "... done!" 67 | 68 | sys.exit(status) 69 | 70 | if __name__ == '__main__': 71 | main() 72 | 73 | # vim:set ts=4 sw=4 sts=4 expandtab: 74 | -------------------------------------------------------------------------------- /pysftpd.ini.example: -------------------------------------------------------------------------------- 1 | [pysftpd] 2 | auth_config = ./authconfig.ini 3 | host_key.0 = ./server_rsa_key 4 | host_key.1 = ./server_dss_key 5 | listen_host = 6 | listen_port = 54321 7 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | from distutils.core import setup 20 | 21 | setup( 22 | name='PySFTPd', 23 | version='0.1.0', # don't forget to update download_url and "Development Status" below 24 | download_url='https://secure.dlitz.net/pub/dlitz/python/pysftpd/PySFTPd-0.1.0.tar.gz', 25 | requires=['paramiko (>=1.7.2)'], 26 | description='SFTP daemon', 27 | long_description="PySFTPd is an SFTP server implementation that builds upon the paramiko secure shell library.", 28 | author='Dwayne C. Litzenberger', 29 | author_email='dlitz@dlitz.net', 30 | url='http://www.dlitz.net/software/pysftpd/', 31 | packages=['sftpd'], 32 | license='GNU General Public License (GPL) >= 3', 33 | classifiers=[ 34 | 'Development Status :: 3 - Alpha', 35 | 'Intended Audience :: Developers', 36 | 'Intended Audience :: System Administrators', 37 | 'Topic :: Internet', 38 | 'Topic :: Security :: Cryptography', 39 | 'License :: OSI Approved :: GNU General Public License (GPL)', 40 | 'Operating System :: POSIX :: Linux', 41 | ], 42 | ) 43 | 44 | # vim:set ts=4 sw=4 sts=4 expandtab: 45 | -------------------------------------------------------------------------------- /sftp-server.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | import optparse 20 | import sys 21 | import os 22 | import logging 23 | import pwd 24 | import grp 25 | import paramiko 26 | from sftpd.CLI import CLI 27 | 28 | if __name__ == '__main__': 29 | CLI().main() 30 | 31 | # vim:set ts=4 sw=4 sts=4 expandtab: 32 | -------------------------------------------------------------------------------- /sftpd/Authorization.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | import paramiko 20 | import crypt 21 | 22 | class Authorization(paramiko.ServerInterface): 23 | 24 | users = None 25 | 26 | def __init__(self, users, setAuthUserFunc): 27 | self.users = users 28 | self._setAuthUser = setAuthUserFunc 29 | 30 | def get_allowed_auths(self, username): 31 | return "publickey,password" 32 | 33 | def check_auth_none(self, username): 34 | if username == 'anonymous' and username in self.users and self.users[username].anonymous: 35 | self._setAuthUser(self.users[username]) 36 | return paramiko.AUTH_SUCCESSFUL 37 | else: 38 | return paramiko.AUTH_FAILED 39 | 40 | def check_auth_password(self, username, password): 41 | if username == 'anonymous' and username in self.users and self.users[username].anonymous: 42 | # 'anonymous' user may use any password 43 | pass 44 | elif username in self.users: 45 | pwhash = self.users[username].password_hash 46 | if crypt.crypt(password, pwhash) != pwhash: 47 | return paramiko.AUTH_FAILED 48 | else: 49 | return paramiko.AUTH_FAILED 50 | self._setAuthUser(self.users[username]) 51 | return paramiko.AUTH_SUCCESSFUL 52 | 53 | def check_auth_publickey(self, username, key): 54 | if username == 'anonymous' and username in self.users and self.users[username].anonymous: 55 | # 'anonymous' user may use any public key 56 | pass 57 | elif username in self.users: 58 | if key not in self.users[username].authorized_keys: 59 | return paramiko.AUTH_FAILED 60 | else: 61 | return paramiko.AUTH_FAILED 62 | self._setAuthUser(self.users[username]) 63 | return paramiko.AUTH_SUCCESSFUL 64 | 65 | def check_channel_request(self, kind, chanid): 66 | if kind == 'session': 67 | return paramiko.OPEN_SUCCEEDED 68 | return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED 69 | 70 | # vim:set ts=4 sw=4 sts=4 expandtab: 71 | -------------------------------------------------------------------------------- /sftpd/CLI.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | import optparse 20 | import sys 21 | import os 22 | import logging 23 | import pwd 24 | import grp 25 | import paramiko 26 | from SFTPServer import SFTPServer 27 | from Configuration import Configuration 28 | 29 | class CLI(object): 30 | 31 | def parse_args(self): 32 | # Defaults 33 | defaults = {} 34 | defaults['config'] = "/etc/pysftpd/pysftpd.ini" 35 | 36 | # Parse options 37 | op = optparse.OptionParser(usage="Usage: %s [opts]") 38 | op.add_option("-c", "--config", metavar="FILE", 39 | dest="config", default=defaults['config'], 40 | help="load program configuration from FILE (default: %s)" % (defaults['config'],)) 41 | op.add_option("--user", metavar="NAME", 42 | dest="user", 43 | help="setuid to this user before accepting connections") 44 | op.add_option("--group", metavar="NAME", 45 | dest="group", 46 | help="setgid to this group before accepting connections") 47 | op.add_option("--chroot", metavar="PATH", 48 | dest="chroot", 49 | help="[experimental] chroot to PATH before accepting connections (requires --user and --group; don't forget to close open file descriptors!)") 50 | op.add_option("-v", "--verbose", metavar="FILE", 51 | dest="verbosity", action="count", default=0, 52 | help="verbose operation (multiple -v options allowed)") 53 | 54 | (options, args) = op.parse_args() 55 | if len(args) != 0: 56 | print >>sys.stderr, "%s: error: invalid arguments" % (sys.argv[0],) 57 | sys.exit(1) 58 | 59 | if options.chroot and (not options.user or not options.group): 60 | print >>sys.stderr, "%s: error: --chroot requires --user and --group" % (sys.argv[0],) 61 | sys.exit(1) 62 | 63 | return options 64 | 65 | def main(self): 66 | options = self.parse_args() 67 | 68 | # Log verbosity 69 | if options.verbosity == 0: 70 | logging.basicConfig(level=logging.ERROR) 71 | elif options.verbosity == 1: 72 | logging.basicConfig(level=logging.INFO) 73 | elif options.verbosity >= 2: 74 | logging.basicConfig(level=logging.DEBUG) 75 | 76 | config = Configuration(options.config) 77 | 78 | server = SFTPServer(config.bind_address, config=config) 79 | if options.chroot: 80 | uid = pwd.getpwnam(options.user)[2] 81 | gid = grp.getgrnam(options.group)[2] 82 | 83 | # TODO: Audit this 84 | os.chroot(options.chroot) 85 | os.setgroups([]) # Drop supplemental group privileges 86 | os.setgid(gid) 87 | os.setuid(uid) 88 | server.serve_forever() 89 | 90 | 91 | # vim:set ts=4 sw=4 sts=4 expandtab: 92 | -------------------------------------------------------------------------------- /sftpd/Configuration.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | import ConfigParser 20 | import paramiko 21 | import base64 22 | 23 | class ConfigurationError(Exception): 24 | pass 25 | 26 | class User(object): 27 | def __init__(self): 28 | self.anonymous = False 29 | self.password_hash = None 30 | self.root_path = None 31 | self.authorized_keys = [] 32 | 33 | class Configuration(object): 34 | 35 | def __init__(self, conffile_path): 36 | self.conffile_path = conffile_path 37 | self.load() 38 | 39 | def load(self): 40 | cfgSection = 'pysftpd' 41 | 42 | # Read the main configuration file 43 | config = ConfigParser.RawConfigParser() 44 | if not config.read(self.conffile_path): 45 | raise ConfigurationError("Unable to load configuration file %r" % (self.conffile_path,)) 46 | 47 | # Read bind address 48 | listen_host = config.get(cfgSection, 'listen_host') 49 | listen_port = config.getint(cfgSection, 'listen_port') 50 | self.bind_address = (listen_host, listen_port) 51 | 52 | # Load host keys 53 | host_keys = [] 54 | for optname in config.options(cfgSection): 55 | if optname != "host_key" and not optname.startswith("host_key."): 56 | continue 57 | filename = config.get(cfgSection, optname) 58 | try: 59 | host_key = paramiko.RSAKey.from_private_key_file(filename=filename) 60 | except paramiko.SSHException: 61 | host_key = paramiko.DSSKey.from_private_key_file(filename=filename) 62 | host_keys.append(host_key) 63 | host_key = None # erase reference to host key 64 | if not host_keys: 65 | raise ConfigurationError("config file %r does not specify any host key" % (self.conffile_path,)) 66 | self.host_keys = host_keys 67 | 68 | # Load the user auth file (authconfig.ini) 69 | auth_config = ConfigParser.RawConfigParser() 70 | auth_config.read(config.get(cfgSection, 'auth_config')) 71 | users = {} 72 | for username in auth_config.sections(): 73 | u = User() 74 | if auth_config.has_option(username, 'anonymous'): 75 | u.anonymous = auth_config.getboolean(username, 'anonymous') 76 | if not u.anonymous: 77 | u.password_hash = auth_config.get(username, 'password') 78 | u.root_path = auth_config.get(username, 'root_path') 79 | 80 | # TODO: Move authorized_keys parsing into a separate function 81 | u.authorized_keys = [] 82 | if auth_config.has_option(username, 'authorized_keys_file'): 83 | filename = auth_config.get(username, 'authorized_keys_file') 84 | for rawline in open(filename, 'r'): 85 | line = rawline.strip() 86 | if not line or line.startswith("#"): 87 | continue 88 | if line.startswith("ssh-rsa ") or line.startswith("ssh-dss "): 89 | # Get the key field 90 | try: 91 | d = " ".join(line.split(" ")[1:]).lstrip().split(" ")[0] 92 | except: 93 | # Parse error 94 | continue 95 | if line.startswith("ssh-rsa"): 96 | k = paramiko.RSAKey(data=base64.decodestring(d)) 97 | else: 98 | k = paramiko.DSSKey(data=base64.decodestring(d)) 99 | del d 100 | u.authorized_keys.append(k) 101 | users[username] = u 102 | self.users = users 103 | 104 | # vim:set ts=4 sw=4 sts=4 expandtab: 105 | -------------------------------------------------------------------------------- /sftpd/SFTPServer.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | import SocketServer 20 | from SFTPServerInterface import SFTPServerInterface 21 | from Authorization import Authorization 22 | from errors import ProtocolError 23 | import paramiko 24 | 25 | class SFTPServer(SocketServer.TCPServer): 26 | 27 | def __init__(self, server_address, config, RequestHandlerClass=None): 28 | if RequestHandlerClass is None: 29 | RequestHandlerClass = SFTPConnectionRequestHandler 30 | SocketServer.TCPServer.__init__(self, server_address, RequestHandlerClass) 31 | 32 | # These attributes will be accessed by the RequestHandlerClass 33 | self.users = config.users 34 | self.host_keys = config.host_keys 35 | 36 | 37 | class SFTPConnectionRequestHandler(SocketServer.BaseRequestHandler): 38 | 39 | auth_timeout = 120 # authentication timeout (in seconds) 40 | 41 | def setup(self): 42 | self.transport = self.make_transport(self.request) 43 | self.load_server_moduli() 44 | self.set_security_options() 45 | self.add_host_keys() 46 | self.set_subsystem_handlers() 47 | 48 | def handle(self): 49 | srvIface = Authorization(self.server.users, self._set_authenticated_user) 50 | self.transport.start_server(server=srvIface) 51 | # Get the session channel 52 | chan = self.transport.accept(self.auth_timeout) 53 | if chan is None: 54 | raise ProtocolError("session channel not opened (authentication failure?)") 55 | self.transport.join() 56 | 57 | def _set_authenticated_user(self, user): 58 | self._auth_user = user 59 | 60 | def _get_authenticated_user(self): 61 | return self._auth_user 62 | 63 | def make_transport(self, sock): 64 | return paramiko.Transport(sock) 65 | 66 | def load_server_moduli(self): 67 | self.transport.load_server_moduli() 68 | 69 | def set_security_options(self): 70 | so = self.transport.get_security_options() 71 | 72 | # Don't support any of (hmac-sha1-96, hmac-md5, hmac-md5-96, none) 73 | so.digests = ('hmac-sha1',) 74 | 75 | # Support delayed zlib compression, but not 'zlib' compression. 76 | # 'zlib@openssh.com' does the same thing as 'zlib', but avoids attacks 77 | # by unauthenticated users. 78 | so.compression = ('zlib@openssh.com', 'none') 79 | 80 | def add_host_keys(self): 81 | for key in self.server.host_keys: 82 | self.transport.add_server_key(key) 83 | 84 | def set_subsystem_handlers(self): 85 | self.transport.set_subsystem_handler('sftp', paramiko.SFTPServer, 86 | sftp_si=SFTPServerInterface, getUserFunc=self._get_authenticated_user) 87 | 88 | 89 | # vim:set ts=4 sw=4 sts=4 expandtab: 90 | -------------------------------------------------------------------------------- /sftpd/SFTPServerInterface.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | import paramiko 20 | import os 21 | import stat 22 | import posixpath 23 | import sys 24 | 25 | class SFTPServerInterface(paramiko.SFTPServerInterface): 26 | 27 | def __init__(self, server, getUserFunc): 28 | self._base_dir = getUserFunc().root_path 29 | 30 | def _local_path(self, sftp_path): 31 | """Return the local path given an SFTP path. Raise an exception if the path is illegal.""" 32 | if sys.platform == 'win32': 33 | # We would need to check for illegal characters, special filenames like 34 | # PRN.txt and AUX, and then convert to unicode (for NTFS). 35 | # See "Naming a File" 36 | raise NotImplementedError("Win32 path sanitization not implemented") 37 | absBasePath = os.path.abspath(self._base_dir) 38 | if not sftp_path.startswith("/"): 39 | raise ValueError("Invalid SFTP path %r" % sftp_path) 40 | sp = posixpath.normpath(sftp_path) 41 | sp = sp.lstrip("/") 42 | assert('..' not in posixpath.split(sp)) 43 | lp = os.path.abspath(os.path.join(self._base_dir, sp)) 44 | assert(os.path.commonprefix((absBasePath, lp)) == absBasePath) 45 | return lp 46 | 47 | def list_folder(self, sftp_path): 48 | local_path = self._local_path(sftp_path) 49 | retval = [] 50 | for filename in os.listdir(local_path): 51 | lpf = os.path.join(local_path, filename) 52 | retval.append(paramiko.SFTPAttributes.from_stat(os.lstat(lpf), filename)) 53 | return retval 54 | 55 | def stat(self, sftp_path): 56 | local_path = self._local_path(sftp_path) 57 | filename = os.path.basename(local_path) 58 | return paramiko.SFTPAttributes.from_stat(os.stat(local_path), filename) 59 | 60 | def lstat(self, sftp_path): 61 | local_path = self._local_path(sftp_path) 62 | filename = os.path.basename(local_path) 63 | return paramiko.SFTPAttributes.from_stat(os.lstat(local_path), filename) 64 | 65 | def open(self, sftp_path, flags, attr): 66 | local_path = self._local_path(sftp_path) 67 | if (flags & os.O_WRONLY) or (flags & os.O_RDWR): 68 | return paramiko.SFTP_PERMISSION_DENIED 69 | h = paramiko.SFTPHandle() 70 | h.readfile = open(local_path, "rb") 71 | return h 72 | 73 | # vim:set ts=4 sw=4 sts=4 expandtab: 74 | -------------------------------------------------------------------------------- /sftpd/__init__.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | """ 20 | I{PySFTPd} is a Python module that implements a ready-made SFTP server on top 21 | of the Paramiko library. 22 | 23 | PySFTPd is released under the GNU General Public License. See the source code 24 | for details. 25 | """ 26 | 27 | from errors import ProtocolError 28 | 29 | # vim:set ts=4 sw=4 sts=4 expandtab: 30 | -------------------------------------------------------------------------------- /sftpd/errors.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python -tt 2 | # -*- coding: ascii -*- 3 | # Copyright (c) 2007, 2008 Dwayne C. Litzenberger 4 | # 5 | # This file is part of PySFTPd. 6 | # 7 | # PySFTPd is free software: you can redistribute it and/or modify it under the 8 | # terms of the GNU General Public License as published by the Free Software 9 | # Foundation, either version 3 of the License, or (at your option) any later 10 | # version. 11 | # 12 | # PySFTPd is distributed in the hope that it will be useful, but WITHOUT ANY 13 | # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 14 | # A PARTICULAR PURPOSE. See the GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | class ProtocolError(Exception): 20 | """The remote application behaved unexpectedly.""" 21 | 22 | # vim:set ts=4 sw=4 sts=4 expandtab: 23 | 24 | --------------------------------------------------------------------------------