314 lines
10 KiB
Python
314 lines
10 KiB
Python
#!/usr/bin/env python3
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# License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
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import atexit
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import io
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import os
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import re
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import shlex
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import sys
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import tarfile
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import tempfile
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import time
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from base64 import standard_b64decode
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from contextlib import suppress
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from typing import (
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Any, Dict, Iterator, List, NoReturn, Optional, Set, Tuple, Union
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)
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from kitty.constants import cache_dir, shell_integration_dir, terminfo_dir
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from kitty.shell_integration import get_effective_ksi_env_var
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from kitty.short_uuid import uuid4
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from kitty.types import run_once
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from kitty.utils import SSHConnectionData
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from .completion import complete, ssh_options
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from .options.types import Options as SSHOptions
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def make_tarfile(ssh_opts: SSHOptions) -> bytes:
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def normalize_tarinfo(tarinfo: tarfile.TarInfo) -> tarfile.TarInfo:
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tarinfo.uname = tarinfo.gname = 'kitty'
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tarinfo.uid = tarinfo.gid = 0
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return tarinfo
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def add_data_as_file(tf: tarfile.TarFile, arcname: str, data: Union[str, bytes]) -> tarfile.TarInfo:
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ans = tarfile.TarInfo(arcname)
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ans.mtime = int(time.time())
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ans.type = tarfile.REGTYPE
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if isinstance(data, str):
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data = data.encode('utf-8')
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ans.size = len(data)
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normalize_tarinfo(ans)
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tf.addfile(ans, io.BytesIO(data))
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return ans
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def filter_files(tarinfo: tarfile.TarInfo) -> Optional[tarfile.TarInfo]:
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if tarinfo.name.endswith('ssh/bootstrap.sh') or tarinfo.name.endswith('ssh/bootstrap.py'):
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return None
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return normalize_tarinfo(tarinfo)
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buf = io.BytesIO()
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with tarfile.open(mode='w:bz2', fileobj=buf, encoding='utf-8') as tf:
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rd = ssh_opts.remote_dir.rstrip('/')
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ksi = get_effective_ksi_env_var()
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if ksi:
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tf.add(shell_integration_dir, arcname=rd + '/shell-integration', filter=filter_files)
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add_data_as_file(tf, rd + '/settings/ksi_env_var', ksi)
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tf.add(terminfo_dir, arcname='.terminfo', filter=filter_files)
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return buf.getvalue()
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@run_once
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def load_ssh_options() -> Dict[str, SSHOptions]:
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from .config import init_config
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return init_config()
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def get_ssh_data(msg: str, ssh_opts: Optional[Dict[str, SSHOptions]] = None) -> Iterator[bytes]:
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from .config import options_for_host
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record_sep = b'\036'
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if ssh_opts is None:
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ssh_opts = load_ssh_options()
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def fmt_prefix(msg: Any) -> bytes:
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return str(msg).encode('ascii') + record_sep
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yield record_sep # to discard leading data
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try:
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msg = standard_b64decode(msg).decode('utf-8')
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md = dict(x.split('=', 1) for x in msg.split(':'))
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hostname = md['hostname']
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pw = md['pw']
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pwfilename = md['pwfile']
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except Exception:
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yield fmt_prefix('!invalid ssh data request message')
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else:
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try:
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with open(os.path.join(cache_dir(), pwfilename)) as f:
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os.unlink(f.name)
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if pw != f.read():
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raise ValueError('Incorrect password')
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except Exception:
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yield fmt_prefix('!incorrect ssh data password')
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else:
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resolved_ssh_opts = options_for_host(hostname, ssh_opts)
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try:
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data = make_tarfile(resolved_ssh_opts)
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except Exception:
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yield fmt_prefix('!error while gathering ssh data')
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else:
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from base64 import standard_b64encode
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encoded_data = standard_b64encode(data)
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yield fmt_prefix(len(encoded_data))
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yield fmt_prefix(resolved_ssh_opts.remote_dir)
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yield encoded_data
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def safe_remove(x: str) -> None:
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with suppress(OSError):
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os.remove(x)
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def prepare_script(ans: str, replacements: Dict[str, str]) -> str:
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pw = uuid4()
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with tempfile.NamedTemporaryFile(prefix='ssh-kitten-pw-', dir=cache_dir(), delete=False) as tf:
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tf.write(pw.encode('utf-8'))
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atexit.register(safe_remove, tf.name)
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replacements['DATA_PASSWORD'] = pw
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replacements['PASSWORD_FILENAME'] = os.path.basename(tf.name)
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for k in ('EXEC_CMD', 'OVERRIDE_LOGIN_SHELL'):
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replacements[k] = replacements.get(k, '')
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def sub(m: 're.Match[str]') -> str:
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return replacements[m.group()]
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return re.sub('|'.join(fr'\b{k}\b' for k in replacements), sub, ans)
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def bootstrap_script(script_type: str = 'sh', **replacements: str) -> str:
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with open(os.path.join(shell_integration_dir, 'ssh', f'bootstrap.{script_type}')) as f:
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ans = f.read()
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return prepare_script(ans, replacements)
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def load_script(script_type: str = 'sh', exec_cmd: str = '') -> str:
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return bootstrap_script(script_type, EXEC_CMD=exec_cmd)
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def get_ssh_cli() -> Tuple[Set[str], Set[str]]:
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other_ssh_args: Set[str] = set()
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boolean_ssh_args: Set[str] = set()
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for k, v in ssh_options().items():
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k = f'-{k}'
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if v:
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other_ssh_args.add(k)
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else:
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boolean_ssh_args.add(k)
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return boolean_ssh_args, other_ssh_args
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def get_connection_data(args: List[str], cwd: str = '') -> Optional[SSHConnectionData]:
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boolean_ssh_args, other_ssh_args = get_ssh_cli()
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port: Optional[int] = None
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expecting_port = expecting_identity = False
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expecting_option_val = False
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expecting_hostname = False
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host_name = identity_file = found_ssh = ''
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for i, arg in enumerate(args):
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if not found_ssh:
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if os.path.basename(arg).lower() in ('ssh', 'ssh.exe'):
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found_ssh = arg
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continue
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if expecting_hostname:
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host_name = arg
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continue
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if arg.startswith('-') and not expecting_option_val:
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if arg in boolean_ssh_args:
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continue
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if arg == '--':
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expecting_hostname = True
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if arg.startswith('-p'):
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if arg[2:].isdigit():
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with suppress(Exception):
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port = int(arg[2:])
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continue
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elif arg == '-p':
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expecting_port = True
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elif arg.startswith('-i'):
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if arg == '-i':
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expecting_identity = True
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else:
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identity_file = arg[2:]
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continue
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expecting_option_val = True
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continue
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if expecting_option_val:
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if expecting_port:
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with suppress(Exception):
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port = int(arg)
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expecting_port = False
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elif expecting_identity:
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identity_file = arg
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expecting_option_val = False
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continue
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if not host_name:
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host_name = arg
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if not host_name:
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return None
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if identity_file:
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if not os.path.isabs(identity_file):
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identity_file = os.path.expanduser(identity_file)
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if not os.path.isabs(identity_file):
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identity_file = os.path.normpath(os.path.join(cwd or os.getcwd(), identity_file))
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return SSHConnectionData(found_ssh, host_name, port, identity_file)
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class InvalidSSHArgs(ValueError):
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def __init__(self, msg: str = ''):
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super().__init__(msg)
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self.err_msg = msg
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def system_exit(self) -> None:
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if self.err_msg:
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print(self.err_msg, file=sys.stderr)
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os.execlp('ssh', 'ssh')
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def parse_ssh_args(args: List[str]) -> Tuple[List[str], List[str], bool]:
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boolean_ssh_args, other_ssh_args = get_ssh_cli()
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passthrough_args = {f'-{x}' for x in 'Nnf'}
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ssh_args = []
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server_args: List[str] = []
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expecting_option_val = False
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passthrough = False
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stop_option_processing = False
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for argument in args:
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if len(server_args) > 1 or stop_option_processing:
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server_args.append(argument)
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continue
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if argument.startswith('-') and not expecting_option_val:
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if argument == '--':
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stop_option_processing = True
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continue
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# could be a multi-character option
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all_args = argument[1:]
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for i, arg in enumerate(all_args):
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arg = f'-{arg}'
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if arg in passthrough_args:
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passthrough = True
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if arg in boolean_ssh_args:
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ssh_args.append(arg)
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continue
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if arg in other_ssh_args:
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ssh_args.append(arg)
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rest = all_args[i+1:]
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if rest:
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ssh_args.append(rest)
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else:
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expecting_option_val = True
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break
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raise InvalidSSHArgs(f'unknown option -- {arg[1:]}')
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continue
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if expecting_option_val:
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ssh_args.append(argument)
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expecting_option_val = False
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continue
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server_args.append(argument)
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if not server_args:
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raise InvalidSSHArgs()
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return ssh_args, server_args, passthrough
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def get_posix_cmd(remote_args: List[str]) -> List[str]:
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command_to_execute = ''
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if remote_args:
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# ssh simply concatenates multiple commands using a space see
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# line 1129 of ssh.c and on the remote side sshd.c runs the
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# concatenated command as shell -c cmd
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args = [c.replace("'", """'"'"'""") for c in remote_args]
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command_to_execute = "exec $login_shell -c '{}'".format(' '.join(args))
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sh_script = load_script(exec_cmd=command_to_execute)
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return [f'sh -c {shlex.quote(sh_script)}']
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def get_python_cmd(remote_args: List[str]) -> List[str]:
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raise NotImplementedError('TODO: Implement me')
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def main(args: List[str]) -> NoReturn:
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args = args[1:]
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use_posix = True
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if args and args[0] == 'use-python':
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args = args[1:]
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use_posix = False
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try:
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ssh_args, server_args, passthrough = parse_ssh_args(args)
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except InvalidSSHArgs as e:
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e.system_exit()
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cmd = ['ssh'] + ssh_args
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if passthrough:
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cmd += server_args
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else:
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hostname, remote_args = server_args[0], server_args[1:]
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if not remote_args:
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cmd.append('-t')
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cmd.append('--')
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cmd.append(hostname)
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f = get_posix_cmd if use_posix else get_python_cmd
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cmd += f(remote_args)
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os.execvp('ssh', cmd)
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if __name__ == '__main__':
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main(sys.argv)
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elif __name__ == '__completer__':
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setattr(sys, 'kitten_completer', complete)
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