mirror of
https://github.com/ClickHouse/ClickHouse.git
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135 lines
4.0 KiB
Python
135 lines
4.0 KiB
Python
#!/usr/bin/env python3
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import logging
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import os
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import shutil
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import signal
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import subprocess
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import tempfile
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class SSHAgent:
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def __init__(self):
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self._env = {}
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self._env_backup = {}
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self._keys = {}
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self.start()
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@property
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def pid(self):
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return int(self._env["SSH_AGENT_PID"])
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def start(self):
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if shutil.which("ssh-agent") is None:
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raise RuntimeError("ssh-agent binary is not available")
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self._env_backup["SSH_AUTH_SOCK"] = os.environ.get("SSH_AUTH_SOCK")
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self._env_backup["SSH_OPTIONS"] = os.environ.get("SSH_OPTIONS")
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# set ENV from stdout of ssh-agent
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for line in self._run(["ssh-agent"]).splitlines():
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name, _, value = line.partition(b"=")
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if _ == b"=":
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value = value.split(b";", 1)[0]
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self._env[name.decode()] = value.decode()
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os.environ[name.decode()] = value.decode()
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ssh_options = (
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"," + os.environ["SSH_OPTIONS"] if os.environ.get("SSH_OPTIONS") else ""
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)
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os.environ[
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"SSH_OPTIONS"
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] = f"{ssh_options}UserKnownHostsFile=/dev/null,StrictHostKeyChecking=no"
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def add(self, key):
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key_pub = self._key_pub(key)
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if key_pub in self._keys:
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self._keys[key_pub] += 1
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else:
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self._run(["ssh-add", "-"], stdin=key.encode())
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self._keys[key_pub] = 1
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return key_pub
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def remove(self, key_pub):
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if key_pub not in self._keys:
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raise ValueError(f"Private key not found, public part: {key_pub}")
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if self._keys[key_pub] > 1:
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self._keys[key_pub] -= 1
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else:
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with tempfile.NamedTemporaryFile() as f:
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f.write(key_pub)
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f.flush()
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self._run(["ssh-add", "-d", f.name])
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self._keys.pop(key_pub)
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def print_keys(self):
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keys = self._run(["ssh-add", "-l"]).splitlines()
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if keys:
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logging.info("ssh-agent keys:")
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for key in keys:
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logging.info("%s", key)
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else:
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logging.info("ssh-agent (pid %d) is empty", self.pid)
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def kill(self):
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for k, v in self._env.items():
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os.environ.pop(k, None)
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for k, v in self._env_backup.items():
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if v is not None:
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os.environ[k] = v
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os.kill(self.pid, signal.SIGTERM)
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def _key_pub(self, key):
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with tempfile.NamedTemporaryFile() as f:
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f.write(key.encode())
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f.flush()
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return self._run(["ssh-keygen", "-y", "-f", f.name])
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@staticmethod
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def _run(cmd, stdin=None):
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shell = isinstance(cmd, str)
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with subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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stdin=subprocess.PIPE if stdin else None,
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shell=shell,
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) as p:
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stdout, stderr = p.communicate(stdin)
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if stdout.strip().decode() == "The agent has no identities.":
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return ""
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if p.returncode:
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message = stderr.strip() + b"\n" + stdout.strip()
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raise RuntimeError(message.strip().decode())
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return stdout
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class SSHKey:
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def __init__(self, key_name=None, key_value=None):
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if key_name is None and key_value is None:
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raise ValueError("Either key_name or key_value must be specified")
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if key_name is not None and key_value is not None:
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raise ValueError("key_name or key_value must be specified")
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if key_name is not None:
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self.key = os.getenv(key_name)
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else:
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self.key = key_value
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self._key_pub = None
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self._ssh_agent = SSHAgent()
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def __enter__(self):
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self._key_pub = self._ssh_agent.add(self.key)
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self._ssh_agent.print_keys()
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def __exit__(self, exc_type, exc_val, exc_tb):
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self._ssh_agent.remove(self._key_pub)
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self._ssh_agent.print_keys()
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