2023-08-09 14:38:08 +00:00
|
|
|
import os
|
|
|
|
import shutil
|
|
|
|
import subprocess
|
|
|
|
import time
|
|
|
|
from pathlib import Path
|
|
|
|
from sys import platform
|
|
|
|
from tempfile import TemporaryDirectory
|
2023-08-10 10:30:52 +00:00
|
|
|
from typing import TYPE_CHECKING, Iterator
|
2023-08-09 14:38:08 +00:00
|
|
|
|
|
|
|
import pytest
|
2023-08-10 13:35:38 +00:00
|
|
|
|
|
|
|
if TYPE_CHECKING:
|
|
|
|
from command import Command
|
2023-08-27 07:34:36 +00:00
|
|
|
from ports import PortFunction
|
2023-08-09 14:38:08 +00:00
|
|
|
|
|
|
|
|
|
|
|
class Sshd:
|
|
|
|
def __init__(self, port: int, proc: subprocess.Popen[str], key: str) -> None:
|
|
|
|
self.port = port
|
|
|
|
self.proc = proc
|
|
|
|
self.key = key
|
|
|
|
|
|
|
|
|
|
|
|
class SshdConfig:
|
2023-08-10 10:30:52 +00:00
|
|
|
def __init__(
|
|
|
|
self, path: Path, login_shell: Path, key: str, preload_lib: Path
|
|
|
|
) -> None:
|
2023-08-09 14:38:08 +00:00
|
|
|
self.path = path
|
2023-08-10 10:30:52 +00:00
|
|
|
self.login_shell = login_shell
|
2023-08-09 14:38:08 +00:00
|
|
|
self.key = key
|
|
|
|
self.preload_lib = preload_lib
|
|
|
|
|
|
|
|
|
|
|
|
@pytest.fixture(scope="session")
|
|
|
|
def sshd_config(project_root: Path, test_root: Path) -> Iterator[SshdConfig]:
|
|
|
|
# FIXME, if any parent of `project_root` is world-writable than sshd will refuse it.
|
|
|
|
with TemporaryDirectory(dir=project_root) as _dir:
|
|
|
|
dir = Path(_dir)
|
|
|
|
host_key = dir / "host_ssh_host_ed25519_key"
|
|
|
|
subprocess.run(
|
|
|
|
[
|
|
|
|
"ssh-keygen",
|
|
|
|
"-t",
|
|
|
|
"ed25519",
|
|
|
|
"-f",
|
|
|
|
host_key,
|
|
|
|
"-N",
|
|
|
|
"",
|
|
|
|
],
|
|
|
|
check=True,
|
|
|
|
)
|
|
|
|
|
|
|
|
sshd_config = dir / "sshd_config"
|
|
|
|
sshd_config.write_text(
|
|
|
|
f"""
|
|
|
|
HostKey {host_key}
|
|
|
|
LogLevel DEBUG3
|
|
|
|
# In the nix build sandbox we don't get any meaningful PATH after login
|
|
|
|
MaxStartups 64:30:256
|
|
|
|
AuthorizedKeysFile {host_key}.pub
|
2023-08-10 10:30:52 +00:00
|
|
|
AcceptEnv REALPATH
|
2023-08-09 14:38:08 +00:00
|
|
|
"""
|
|
|
|
)
|
2023-08-10 10:30:52 +00:00
|
|
|
login_shell = dir / "shell"
|
|
|
|
|
|
|
|
bash = shutil.which("bash")
|
|
|
|
path = os.environ["PATH"]
|
|
|
|
assert bash is not None
|
|
|
|
|
|
|
|
login_shell.write_text(
|
|
|
|
f"""#!{bash}
|
|
|
|
if [[ -f /etc/profile ]]; then
|
|
|
|
source /etc/profile
|
|
|
|
fi
|
|
|
|
if [[ -n "$REALPATH" ]]; then
|
|
|
|
export PATH="$REALPATH:${path}"
|
|
|
|
else
|
|
|
|
export PATH="${path}"
|
|
|
|
fi
|
|
|
|
exec {bash} -l "${{@}}"
|
|
|
|
"""
|
|
|
|
)
|
|
|
|
login_shell.chmod(0o755)
|
2023-08-09 14:38:08 +00:00
|
|
|
|
|
|
|
lib_path = None
|
2023-08-10 10:30:52 +00:00
|
|
|
assert (
|
|
|
|
platform == "linux"
|
|
|
|
), "we do not support the ld_preload trick on non-linux just now"
|
2023-08-09 14:38:08 +00:00
|
|
|
|
2023-08-10 10:30:52 +00:00
|
|
|
# This enforces a login shell by overriding the login shell of `getpwnam(3)`
|
|
|
|
lib_path = dir / "libgetpwnam-preload.so"
|
|
|
|
subprocess.run(
|
|
|
|
[
|
|
|
|
os.environ.get("CC", "cc"),
|
|
|
|
"-shared",
|
|
|
|
"-o",
|
|
|
|
lib_path,
|
|
|
|
str(test_root / "getpwnam-preload.c"),
|
|
|
|
],
|
|
|
|
check=True,
|
|
|
|
)
|
|
|
|
|
|
|
|
yield SshdConfig(sshd_config, login_shell, str(host_key), lib_path)
|
2023-08-09 14:38:08 +00:00
|
|
|
|
|
|
|
|
|
|
|
@pytest.fixture
|
2023-08-27 07:34:36 +00:00
|
|
|
def sshd(
|
|
|
|
sshd_config: SshdConfig, command: "Command", unused_tcp_port: "PortFunction"
|
|
|
|
) -> Iterator[Sshd]:
|
|
|
|
import subprocess
|
|
|
|
|
|
|
|
subprocess.run(["echo", "hello"], check=True)
|
|
|
|
port = unused_tcp_port()
|
2023-08-09 14:38:08 +00:00
|
|
|
sshd = shutil.which("sshd")
|
|
|
|
assert sshd is not None, "no sshd binary found"
|
|
|
|
env = {}
|
2023-08-10 10:30:52 +00:00
|
|
|
env = dict(
|
|
|
|
LD_PRELOAD=str(sshd_config.preload_lib),
|
|
|
|
LOGIN_SHELL=str(sshd_config.login_shell),
|
|
|
|
)
|
2023-08-09 14:38:08 +00:00
|
|
|
proc = command.run(
|
2023-08-10 10:30:52 +00:00
|
|
|
[sshd, "-f", str(sshd_config.path), "-D", "-p", str(port)], extra_env=env
|
2023-08-09 14:38:08 +00:00
|
|
|
)
|
|
|
|
|
|
|
|
while True:
|
|
|
|
if (
|
|
|
|
subprocess.run(
|
|
|
|
[
|
|
|
|
"ssh",
|
|
|
|
"-o",
|
|
|
|
"StrictHostKeyChecking=no",
|
|
|
|
"-o",
|
|
|
|
"UserKnownHostsFile=/dev/null",
|
|
|
|
"-i",
|
|
|
|
sshd_config.key,
|
|
|
|
"localhost",
|
|
|
|
"-p",
|
|
|
|
str(port),
|
|
|
|
"true",
|
|
|
|
]
|
|
|
|
).returncode
|
|
|
|
== 0
|
|
|
|
):
|
|
|
|
yield Sshd(port, proc, sshd_config.key)
|
|
|
|
return
|
|
|
|
else:
|
|
|
|
rc = proc.poll()
|
|
|
|
if rc is not None:
|
|
|
|
raise Exception(f"sshd processes was terminated with {rc}")
|
|
|
|
time.sleep(0.1)
|