def check_scp_sftp(self):
""" This method checks if the user is trying to SCP a file onto the
server. If this is the case, it checks if the user is allowed to use
SCP or not, and acts as requested. : )
"""
if 'ssh' in self.conf:
if 'SSH_CLIENT' in os.environ \
and 'SSH_TTY' not in os.environ:
# check if sftp is requested and allowed
if 'sftp-server' in self.conf['ssh']:
if self.conf['sftp'] is 1:
self.log.error('SFTP connect')
utils.exec_cmd(self.conf['ssh'])
self.log.error('SFTP disconnect')
sys.exit(0)
else:
self.log.error('*** forbidden SFTP connection')
sys.exit(0)
# initialize cli session
from lshell.shellcmd import ShellCmd
cli = ShellCmd(self.conf, None, None, None, None,
self.conf['ssh'])
ret_check_path, self.conf = sec.check_path(self.conf['ssh'],
self.conf,
ssh=1)
if ret_check_path == 1:
self.ssh_warn('path over SSH', self.conf['ssh'])
# check if scp is requested and allowed
if self.conf['ssh'].startswith('scp '):
if self.conf['scp'] is 1 or 'scp' in self.conf['overssh']:
if ' -f ' in self.conf['ssh']:
# case scp download is allowed
if self.conf['scp_download']:
self.log.error('SCP: GET "%s"' %
self.conf['ssh'])
# case scp download is forbidden
else:
self.log.error(
'SCP: download forbidden: "%s"' %
self.conf['ssh'])
sys.exit(0)
elif ' -t ' in self.conf['ssh']:
# case scp upload is allowed
if self.conf['scp_upload']:
if 'scpforce' in self.conf:
cmdsplit = self.conf['ssh'].split(' ')
scppath = os.path.realpath(cmdsplit[-1])
forcedpath = os.path.realpath(
self.conf['scpforce'])
if scppath != forcedpath:
self.log.error('SCP: forced SCP '
'directory: %s' %
scppath)
cmdsplit.pop(-1)
cmdsplit.append(forcedpath)
self.conf['ssh'] = string.join(
cmdsplit)
self.log.error('SCP: PUT "%s"' %
self.conf['ssh'])
# case scp upload is forbidden
else:
self.log.error('SCP: upload forbidden: "%s"' %
self.conf['ssh'])
sys.exit(0)
utils.exec_cmd(self.conf['ssh'])
self.log.error('SCP disconnect')
sys.exit(0)
else:
self.ssh_warn('SCP connection', self.conf['ssh'],
'scp')
# check if command is in allowed overssh commands
elif self.conf['ssh']:
# replace aliases
self.conf['ssh'] = utils.get_aliases(
self.conf['ssh'], self.conf['aliases'])
# if command is not "secure", exit
ret_check_secure, self.conf = sec.check_secure(
self.conf['ssh'], self.conf, strict=1, ssh=1)
if ret_check_secure:
self.ssh_warn('char/command over SSH',
self.conf['ssh'])
# else
self.log.error('Over SSH: "%s"' % self.conf['ssh'])
# if command is "help"
if self.conf['ssh'] == "help":
cli.do_help(None)
else:
utils.exec_cmd(self.conf['ssh'])
self.log.error('Exited')
sys.exit(0)
# else warn and log
else:
self.ssh_warn('command over SSH', self.conf['ssh'])
else:
# case of shell escapes
self.ssh_warn('shell escape', self.conf['ssh'])
def __getattr__(self, attr):
""" This method actually takes care of all the called method that are
not resolved (i.e not existing methods). It actually will simulate
the existence of any method entered in the 'allowed' variable list.
e.g. You just have to add 'uname' in list of allowed commands in
the 'allowed' variable, and lshell will react as if you had
added a do_uname in the ShellCmd class!
"""
# expand environment variables in command line
self.g_cmd = os.path.expandvars(self.g_cmd)
self.g_line = os.path.expandvars(self.g_line)
self.g_arg = os.path.expandvars(self.g_arg)
# in case the configuration file has been modified, reload it
if self.conf['config_mtime'] != os.path.getmtime(
self.conf['configfile']):
from lshell.checkconfig import CheckConfig
self.conf = CheckConfig(['--config', self.conf['configfile']],
refresh=1).returnconf()
self.conf['promptprint'] = utils.updateprompt(
os.getcwd(), self.conf)
self.log = self.conf['logpath']
if self.g_cmd in ['quit', 'exit', 'EOF']:
self.log.error('Exited')
if self.g_cmd == 'EOF':
self.stdout.write('\n')
if self.conf['disable_exit'] != 1:
sys.exit(0)
# check that commands/chars present in line are allowed/secure
ret_check_secure, self.conf = sec.check_secure(
self.g_line, self.conf, strict=self.conf['strict'])
if ret_check_secure == 1:
# see http://tldp.org/LDP/abs/html/exitcodes.html
self.retcode = 126
return object.__getattribute__(self, attr)
# check that path present in line are allowed/secure
ret_check_path, self.conf = sec.check_path(self.g_line,
self.conf,
strict=self.conf['strict'])
if ret_check_path == 1:
# see http://tldp.org/LDP/abs/html/exitcodes.html
self.retcode = 126
# in case request was sent by WinSCP, return error code has to be
# sent via an specific echo command
if self.conf['winscp'] and re.search('WinSCP: this is end-of-file',
self.g_line):
utils.exec_cmd('echo "WinSCP: this is end-of-file: %s"' %
self.retcode)
return object.__getattribute__(self, attr)
if self.g_cmd in self.conf['allowed']:
if self.conf['timer'] > 0:
self.mytimer(0)
self.g_arg = re.sub('^~$|^~/', '%s/' % self.conf['home_path'],
self.g_arg)
self.g_arg = re.sub(' ~/', ' %s/' % self.conf['home_path'],
self.g_arg)
# replace previous command exit code
# in case multiple commands (using separators), only replace first
# command. Regex replaces all occurrences of $?, before ;,&,|
if re.search('[;&|]', self.g_line):
p = re.compile("(\s|^)(\$\?)([\s|$]?[;&|].*)")
else:
p = re.compile("(\s|^)(\$\?)(\s|$)")
self.g_line = p.sub(r' %s \3' % self.retcode, self.g_line)
if type(self.conf['aliases']) == dict:
self.g_line = utils.get_aliases(self.g_line,
self.conf['aliases'])
self.log.info('CMD: "%s"' % self.g_line)
if self.g_cmd == 'cd':
# split cd <dir> and rest of command
cmd_split = re.split(';|&&|&|\|\||\|', self.g_line, 1)
# in case the are commands following cd, first change the
# directory, then execute the command
if len(cmd_split) == 2:
directory, command = cmd_split
# only keep cd's argument
directory = directory.split('cd', 1)[1].strip()
# change directory then, if success, execute the rest of
# the cmd line
self.retcode, self.conf = builtins.cd(directory, self.conf)
if self.retcode == 0:
self.retcode = utils.exec_cmd(command)
else:
# set directory to command line argument and change dir
directory = self.g_arg
self.retcode, self.conf = builtins.cd(directory, self.conf)
# built-in lpath function: list all allowed path
elif self.g_cmd == 'lpath':
self.retcode = builtins.lpath(self.conf)
# built-in lsudo function: list all allowed sudo commands
elif self.g_cmd == 'lsudo':
self.retcode = builtins.lsudo(self.conf)
# built-in history function: print command history
elif self.g_cmd == 'history':
self.retcode = builtins.history(self.conf, self.log)
# built-in export function
elif self.g_cmd == 'export':
self.retcode, var = builtins.export(self.g_line)
if self.retcode == 1:
self.log.critical(
"** forbidden environment variable '%s'" % var)
# case 'cd' is in an alias e.g. {'toto':'cd /var/tmp'}
elif self.g_line[0:2] == 'cd':
self.g_cmd = self.g_line.split()[0]
directory = ' '.join(self.g_line.split()[1:])
self.retcode, self.conf = builtins.cd(directory, self.conf)
else:
self.retcode = utils.exec_cmd(self.g_line)
elif self.g_cmd not in ['', '?', 'help', None]:
self.log.warn('INFO: unknown syntax -> "%s"' % self.g_line)
self.stderr.write('*** unknown syntax: %s\n' % self.g_cmd)
self.g_cmd, self.g_arg, self.g_line = ['', '', '']
if self.conf['timer'] > 0:
self.mytimer(self.conf['timer'])
return object.__getattribute__(self, attr)
def cmdloop(self, intro=None):
"""Repeatedly issue a prompt, accept input, parse an initial prefix
off the received input, and dispatch to action methods, passing them
the remainder of the line as argument.
"""
self.preloop()
if self.use_rawinput and self.completekey:
try:
readline.read_history_file(self.conf['history_file'])
readline.set_history_length(self.conf['history_size'])
except IOError:
# if history file does not exist
try:
open(self.conf['history_file'], 'w').close()
readline.read_history_file(self.conf['history_file'])
except IOError:
pass
readline.set_completer_delims(
readline.get_completer_delims().replace('-', ''))
self.old_completer = readline.get_completer()
readline.set_completer(self.complete)
readline.parse_and_bind(self.completekey + ": complete")
try:
if self.intro and isinstance(self.intro, str):
self.stdout.write("%s\n" % self.intro)
if self.conf['login_script']:
utils.exec_cmd(self.conf['login_script'])
stop = None
while not stop:
if self.cmdqueue:
line = self.cmdqueue.pop(0)
else:
if self.use_rawinput:
try:
# raw_input renamed as input in py3
try:
line = raw_input(self.conf['promptprint'])
except NameError:
line = input(self.conf['promptprint'])
except EOFError:
line = 'EOF'
except KeyboardInterrupt:
self.stdout.write('\n')
line = ''
else:
self.stdout.write(self.conf['promptprint'])
self.stdout.flush()
line = self.stdin.readline()
if not len(line):
line = 'EOF'
else:
# chop \n
line = line[:-1]
line = self.precmd(line)
stop = self.onecmd(line)
stop = self.postcmd(stop, line)
self.postloop()
finally:
if self.use_rawinput and self.completekey:
try:
readline.set_completer_delims(
readline.get_completer_delims().replace('-', ''))
readline.set_completer(self.old_completer)
except ImportError:
pass
try:
readline.write_history_file(self.conf['history_file'])
except IOError:
self.log.error('WARN: couldn\'t write history '
'to file %s\n' % self.conf['history_file'])
def check_scp_sftp(self):
""" This method checks if the user is trying to SCP a file onto the
server. If this is the case, it checks if the user is allowed to use
SCP or not, and acts as requested. : )
"""
if 'ssh' in self.conf:
if 'SSH_CLIENT' in os.environ \
and 'SSH_TTY' not in os.environ:
# check if sftp is requested and allowed
if 'sftp-server' in self.conf['ssh']:
if self.conf['sftp'] is 1:
self.log.error('SFTP connect')
utils.exec_cmd(self.conf['ssh'])
self.log.error('SFTP disconnect')
sys.exit(0)
else:
self.log.error('*** forbidden SFTP connection')
sys.exit(0)
# initialize cli session
from lshell.shellcmd import ShellCmd
cli = ShellCmd(self.conf,
None, None, None, None,
self.conf['ssh'])
ret_check_path, self.conf = sec.check_path(self.conf['ssh'],
self.conf,
ssh=1)
if ret_check_path == 1:
self.ssh_warn('path over SSH', self.conf['ssh'])
# check if scp is requested and allowed
if self.conf['ssh'].startswith('scp '):
if self.conf['scp'] is 1 or 'scp' in self.conf['overssh']:
if ' -f ' in self.conf['ssh']:
# case scp download is allowed
if self.conf['scp_download']:
self.log.error('SCP: GET "%s"'
% self.conf['ssh'])
# case scp download is forbidden
else:
self.log.error('SCP: download forbidden: "%s"'
% self.conf['ssh'])
sys.exit(0)
elif ' -t ' in self.conf['ssh']:
# case scp upload is allowed
if self.conf['scp_upload']:
if 'scpforce' in self.conf:
cmdsplit = self.conf['ssh'].split(' ')
scppath = os.path.realpath(cmdsplit[-1])
forcedpath = os.path.realpath(self.conf
['scpforce'])
if scppath != forcedpath:
self.log.error('SCP: forced SCP '
'directory: %s'
% scppath)
cmdsplit.pop(-1)
cmdsplit.append(forcedpath)
self.conf['ssh'] = string.join(
cmdsplit)
self.log.error('SCP: PUT "%s"'
% self.conf['ssh'])
# case scp upload is forbidden
else:
self.log.error('SCP: upload forbidden: "%s"'
% self.conf['ssh'])
sys.exit(0)
utils.exec_cmd(self.conf['ssh'])
self.log.error('SCP disconnect')
sys.exit(0)
else:
self.ssh_warn('SCP connection',
self.conf['ssh'],
'scp')
# check if command is in allowed overssh commands
elif self.conf['ssh']:
# replace aliases
self.conf['ssh'] = utils.get_aliases(self.conf['ssh'],
self.conf['aliases'])
# if command is not "secure", exit
ret_check_secure, self.conf = sec.check_secure(
self.conf['ssh'],
self.conf,
strict=1,
ssh=1)
if ret_check_secure:
self.ssh_warn('char/command over SSH',
self.conf['ssh'])
# else
self.log.error('Over SSH: "%s"' % self.conf['ssh'])
# if command is "help"
if self.conf['ssh'] == "help":
cli.do_help(None)
else:
utils.exec_cmd(self.conf['ssh'])
self.log.error('Exited')
sys.exit(0)
# else warn and log
else:
self.ssh_warn('command over SSH', self.conf['ssh'])
else:
# case of shell escapes
self.ssh_warn('shell escape', self.conf['ssh'])
def __getattr__(self, attr):
""" This method actually takes care of all the called method that are
not resolved (i.e not existing methods). It actually will simulate
the existence of any method entered in the 'allowed' variable list.
e.g. You just have to add 'uname' in list of allowed commands in
the 'allowed' variable, and lshell will react as if you had
added a do_uname in the ShellCmd class!
"""
# expand environment variables in command line
self.g_cmd = os.path.expandvars(self.g_cmd)
self.g_line = os.path.expandvars(self.g_line)
self.g_arg = os.path.expandvars(self.g_arg)
# in case the configuration file has been modified, reload it
if self.conf['config_mtime'] != os.path.getmtime(
self.conf['configfile']):
from lshell.checkconfig import CheckConfig
self.conf = CheckConfig(['--config', self.conf['configfile']],
refresh=1).returnconf()
self.conf['promptprint'] = utils.updateprompt(os.getcwd(),
self.conf)
self.log = self.conf['logpath']
if self.g_cmd in ['quit', 'exit', 'EOF']:
self.log.error('Exited')
if self.g_cmd == 'EOF':
self.stdout.write('\n')
if self.conf['disable_exit'] != 1:
sys.exit(0)
# check that commands/chars present in line are allowed/secure
ret_check_secure, self.conf = sec.check_secure(
self.g_line,
self.conf,
strict=self.conf['strict'])
if ret_check_secure == 1:
# see http://tldp.org/LDP/abs/html/exitcodes.html
self.retcode = 126
return object.__getattribute__(self, attr)
# check that path present in line are allowed/secure
ret_check_path, self.conf = sec.check_path(self.g_line,
self.conf,
strict=self.conf['strict'])
if ret_check_path == 1:
# see http://tldp.org/LDP/abs/html/exitcodes.html
self.retcode = 126
# in case request was sent by WinSCP, return error code has to be
# sent via an specific echo command
if self.conf['winscp'] and re.search('WinSCP: this is end-of-file',
self.g_line):
utils.exec_cmd('echo "WinSCP: this is end-of-file: %s"'
% self.retcode)
return object.__getattribute__(self, attr)
if self.g_cmd in self.conf['allowed']:
if self.conf['timer'] > 0:
self.mytimer(0)
self.g_arg = re.sub('^~$|^~/', '%s/' % self.conf['home_path'],
self.g_arg)
self.g_arg = re.sub(' ~/', ' %s/' % self.conf['home_path'],
self.g_arg)
# replace previous command exit code
# in case multiple commands (using separators), only replace first
# command. Regex replaces all occurrences of $?, before ;,&,|
if re.search('[;&\|]', self.g_line):
p = re.compile("(\s|^)(\$\?)([\s|$]?[;&|].*)")
else:
p = re.compile("(\s|^)(\$\?)(\s|$)")
self.g_line = p.sub(r' %s \3' % self.retcode, self.g_line)
if type(self.conf['aliases']) == dict:
self.g_line = utils.get_aliases(self.g_line,
self.conf['aliases'])
self.log.info('CMD: "%s"' % self.g_line)
if self.g_cmd == 'cd':
# split cd <dir> and rest of command
cmd_split = re.split(';|&&|&|\|\||\|', self.g_line, 1)
# in case the are commands following cd, first change the
# directory, then execute the command
if len(cmd_split) == 2:
directory, command = cmd_split
# only keep cd's argument
directory = directory.split('cd', 1)[1].strip()
# change directory then, if success, execute the rest of
# the cmd line
self.retcode, self.conf = builtins.cd(directory,
self.conf)
if self.retcode == 0:
self.retcode = utils.exec_cmd(command)
else:
# set directory to command line argument and change dir
directory = self.g_arg
self.retcode, self.conf = builtins.cd(directory,
self.conf)
# built-in lpath function: list all allowed path
elif self.g_cmd == 'lpath':
self.retcode = builtins.lpath(self.conf)
# built-in lsudo function: list all allowed sudo commands
elif self.g_cmd == 'lsudo':
self.retcode = builtins.lsudo(self.conf)
# built-in history function: print command history
elif self.g_cmd == 'history':
self.retcode = builtins.history(self.conf, self.log)
# built-in export function
elif self.g_cmd == 'export':
self.retcode, var = builtins.export(self.g_line)
if self.retcode == 1:
self.log.critical("** forbidden environment variable '%s'"
% var)
# case 'cd' is in an alias e.g. {'toto':'cd /var/tmp'}
elif self.g_line[0:2] == 'cd':
self.g_cmd = self.g_line.split()[0]
directory = ' '.join(self.g_line.split()[1:])
self.retcode, self.conf = builtins.cd(directory,
self.conf)
else:
self.retcode = utils.exec_cmd(self.g_line)
elif self.g_cmd not in ['', '?', 'help', None]:
self.log.warn('INFO: unknown syntax -> "%s"' % self.g_line)
self.stderr.write('*** unknown syntax: %s\n' % self.g_cmd)
self.g_cmd, self.g_arg, self.g_line = ['', '', '']
if self.conf['timer'] > 0:
self.mytimer(self.conf['timer'])
return object.__getattribute__(self, attr)
def cmdloop(self, intro=None):
"""Repeatedly issue a prompt, accept input, parse an initial prefix
off the received input, and dispatch to action methods, passing them
the remainder of the line as argument.
"""
self.preloop()
if self.use_rawinput and self.completekey:
try:
readline.read_history_file(self.conf['history_file'])
readline.set_history_length(self.conf['history_size'])
except IOError:
# if history file does not exist
try:
open(self.conf['history_file'], 'w').close()
readline.read_history_file(self.conf['history_file'])
except IOError:
pass
readline.set_completer_delims(
readline.get_completer_delims().replace('-', ''))
self.old_completer = readline.get_completer()
readline.set_completer(self.complete)
readline.parse_and_bind(self.completekey + ": complete")
try:
if self.intro and isinstance(self.intro, str):
self.stdout.write("%s\n" % self.intro)
if self.conf['login_script']:
utils.exec_cmd(self.conf['login_script'])
stop = None
while not stop:
if self.cmdqueue:
line = self.cmdqueue.pop(0)
else:
if self.use_rawinput:
try:
# raw_input renamed as input in py3
try:
line = raw_input(self.conf['promptprint'])
except NameError:
line = input(self.conf['promptprint'])
except EOFError:
line = 'EOF'
except KeyboardInterrupt:
self.stdout.write('\n')
line = ''
else:
self.stdout.write(self.conf['promptprint'])
self.stdout.flush()
line = self.stdin.readline()
if not len(line):
line = 'EOF'
else:
# chop \n
line = line[:-1]
line = self.precmd(line)
stop = self.onecmd(line)
stop = self.postcmd(stop, line)
self.postloop()
finally:
if self.use_rawinput and self.completekey:
try:
readline.set_completer_delims(
readline.get_completer_delims().replace('-', ''))
readline.set_completer(self.old_completer)
except ImportError:
pass
try:
readline.write_history_file(self.conf['history_file'])
except IOError:
self.log.error('WARN: couldn\'t write history '
'to file %s\n' % self.conf['history_file'])