535 lines
20 KiB
Bash
Executable File
535 lines
20 KiB
Bash
Executable File
#!/usr/bin/env bash
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# `boot --server` is deliberately public and must be safe before it reaches the
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# cloned repository. Exercise its root branch through a PTY, against only a
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# temporary filesystem and PATH adapters.
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set -uo pipefail
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repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
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boot="$repo_dir/boot"
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[[ -x "$boot" ]] || {
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printf 'root server bootstrap: %s is not executable\n' "$boot" >&2
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exit 1
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}
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python3 - "$boot" <<'PY'
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import atexit
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import errno
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import fcntl
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import os
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import pty
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import re
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import shutil
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import subprocess
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import sys
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import tempfile
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import termios
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from pathlib import Path
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boot = sys.argv[1]
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work = Path(tempfile.mkdtemp())
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atexit.register(shutil.rmtree, work, ignore_errors=True)
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findings: list[str] = []
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def note(message: str) -> None:
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findings.append(message)
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def write_executable(path: Path, contents: str) -> None:
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path.write_text(contents)
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path.chmod(0o755)
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def make_stubs(stub_dir: Path, fixture_root: Path, calls: Path) -> None:
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common = f'''#!/usr/bin/env bash
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set -u
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calls={str(calls)!r}
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log() {{
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local argument
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{{ for argument in "$@"; do printf '%q ' "$argument"; done; printf '\\n'; }} >>"$calls"
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}}
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consume_result() {{
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local name="$1" results result
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results="$PANAMA_BOOT_FIXTURE_ROOT/state/$name"
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if ! IFS= read -r result <"$results"; then
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return 0
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fi
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/usr/bin/tail -n +2 "$results" >"$results.next"
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/usr/bin/mv -f -- "$results.next" "$results"
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[[ "$result" =~ ^[0-9]+$ ]] || exit 97
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return "$result"
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}}
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'''
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write_executable(stub_dir / "id", common + r'''
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log id "$@"
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case "${1:-}" in
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-u)
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case "${2:-}" in
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'') printf '0\n' ;;
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root) printf '0\n' ;;
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gib) cat "$PANAMA_BOOT_FIXTURE_ROOT/state/target-uid" ;;
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*) exit 97 ;;
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esac
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;;
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-nG) [[ "${2:-}" == gib ]] || exit 97; printf 'gib wheel\n' ;;
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*) exit 97 ;;
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esac
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''')
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write_executable(stub_dir / "passwd", common + r'''
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log passwd "$@"
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[[ "${1:-}" == -S && "${2:-}" == gib ]] || exit 97
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printf 'gib PS\n'
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''')
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write_executable(stub_dir / "getent", common + r'''
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log getent "$@"
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[[ "${1:-}" == passwd && "${2:-}" == gib ]] || exit 97
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home="$(<"$PANAMA_BOOT_FIXTURE_ROOT/state/home")"
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printf 'gib:x:1000:1000::%s:/bin/bash\n' "$home"
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''')
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write_executable(stub_dir / "stat", common + r'''
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log stat "$@"
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[[ "${1:-}" == -Lc && "${2:-}" == '%u:%a' ]] || exit 97
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case "${3:-}" in
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"$PANAMA_BOOT_FIXTURE_ROOT/home/gib/.ssh") cat "$PANAMA_BOOT_FIXTURE_ROOT/state/target-dir-meta" ;;
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"$PANAMA_BOOT_FIXTURE_ROOT/home/gib/.ssh/authorized_keys") cat "$PANAMA_BOOT_FIXTURE_ROOT/state/target-key-meta" ;;
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"$PANAMA_BOOT_FIXTURE_ROOT/root/.ssh/authorized_keys") cat "$PANAMA_BOOT_FIXTURE_ROOT/state/root-key-meta" ;;
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*) exit 97 ;;
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esac
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''')
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write_executable(stub_dir / "runuser", common + r'''
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log runuser "$@"
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[[ "${1:-}" == -u && "${2:-}" == gib && "${3:-}" == -- ]] || exit 97
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shift 3
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"$@"
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''')
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write_executable(stub_dir / "git", common + r'''
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log git "$@"
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case "${1:-}" in
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clone)
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mkdir -p "$3/.git"
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cp "$PANAMA_BOOT_FIXTURE_ROOT/stub-install" "$3/install"
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chmod +x "$3/install"
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;;
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-C) [[ "${3:-}" == pull && "${4:-}" == --ff-only ]] || exit 97 ;;
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*) exit 97 ;;
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esac
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''')
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write_executable(stub_dir / "dnf", common + r'''
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log dnf "$@"
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[[ "${1:-}" == install && "${2:-}" == -y && "${3:-}" == git ]] || exit 97
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''')
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write_executable(stub_dir / "sshd", common + r'''
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log sshd "$@"
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[[ "$#" -eq 1 && "$1" == -t ]] || exit 97
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for artifact in "$PANAMA_BOOT_FIXTURE_ROOT/etc/ssh/sshd_config.d"/.90-panama.*; do
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[[ -e "$artifact" ]] || continue
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log ssh-artifact "$artifact" "$(/usr/bin/stat -c %a -- "$artifact")"
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done
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consume_result SSHD_RESULTS
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''')
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write_executable(stub_dir / "systemctl", common + r'''
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log systemctl "$@"
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case "${1:-}:${2:-}" in
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cat:sshd.service) [[ "$(<"$PANAMA_BOOT_FIXTURE_ROOT/state/SSHD_UNIT")" == present ]] ;;
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cat:ssh.service) [[ "$(<"$PANAMA_BOOT_FIXTURE_ROOT/state/SSH_UNIT")" == present ]] ;;
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reload:sshd.service|reload:ssh.service) consume_result RELOAD_RESULTS ;;
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*) exit 97 ;;
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esac
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''')
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write_executable(stub_dir / "mv", common + r'''
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log mv "$@" "source-mode=$(/usr/bin/stat -c %a -- "${3:-}")"
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exec /usr/bin/mv "$@"
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''')
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for command in ("useradd", "usermod"):
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write_executable(stub_dir / command, common + f'''\nlog {command} "$@"\nexit 97\n''')
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def configure_case(
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name: str,
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*,
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sshd_results: tuple[int, ...] = (),
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reload_results: tuple[int, ...] = (),
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prior_dropin: bytes | None = None,
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sshd_unit: bool = True,
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ssh_unit: bool = True,
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) -> tuple[Path, Path]:
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fixture_root = work / name / "root"
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stub_dir = work / name / "bin"
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calls = fixture_root / "calls"
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state = fixture_root / "state"
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ssh_dir = fixture_root / "home/gib/.ssh"
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root_ssh_dir = fixture_root / "root/.ssh"
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(fixture_root / "etc/ssh/sshd_config.d").mkdir(parents=True)
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ssh_dir.mkdir(parents=True)
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root_ssh_dir.mkdir(parents=True)
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stub_dir.mkdir(parents=True)
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state.mkdir()
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calls.touch()
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(state / "target-uid").write_text("1000\n")
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(state / "home").write_text("/home/gib\n")
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(state / "target-dir-meta").write_text("1000:700\n")
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(state / "target-key-meta").write_text("1000:600\n")
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(state / "root-key-meta").write_text("0:600\n")
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(state / "SSHD_RESULTS").write_text("".join(f"{result}\n" for result in sshd_results))
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(state / "RELOAD_RESULTS").write_text("".join(f"{result}\n" for result in reload_results))
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(state / "SSHD_UNIT").write_text("present\n" if sshd_unit else "absent\n")
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(state / "SSH_UNIT").write_text("present\n" if ssh_unit else "absent\n")
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(fixture_root / "stub-install").write_text(
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"#!/usr/bin/env bash\nprintf 'install-handoff %s\\n' \"${PANAMA_PATH:-unset}\" >> \"$PANAMA_BOOT_FIXTURE_ROOT/calls\"\n"
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)
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(fixture_root / "stub-install").chmod(0o755)
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make_stubs(stub_dir, fixture_root, calls)
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if prior_dropin is not None:
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dropin = fixture_root / "etc/ssh/sshd_config.d/90-panama.conf"
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dropin.write_bytes(prior_dropin)
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dropin.chmod(0o600)
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target_keys = ssh_dir / "authorized_keys"
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root_keys = root_ssh_dir / "authorized_keys"
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if name == "missing":
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pass
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elif name == "empty":
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target_keys.touch()
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elif name == "comment-only":
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target_keys.write_text("# no usable key\n\n")
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elif name == "ssh-directory-symlink":
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shutil.rmtree(ssh_dir)
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alternate = fixture_root / "unsafe-ssh"
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alternate.mkdir()
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(fixture_root / "home/gib/.ssh").symlink_to(alternate)
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elif name == "authorized-keys-symlink":
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alternate = fixture_root / "unsafe-authorized-keys"
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alternate.write_text("ssh-ed25519 unsafe\n")
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target_keys.symlink_to(alternate)
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elif name == "directory-wrong-mode":
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target_keys.write_text("ssh-ed25519 target\n")
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(state / "target-dir-meta").write_text("1000:755\n")
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elif name == "root-copy-directory-wrong-mode":
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root_keys.write_text("ssh-ed25519 root\n")
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(state / "target-dir-meta").write_text("1000:755\n")
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elif name == "file-wrong-mode":
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target_keys.write_text("ssh-ed25519 target\n")
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(state / "target-key-meta").write_text("1000:644\n")
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elif name == "directory-wrong-owner":
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target_keys.write_text("ssh-ed25519 target\n")
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(state / "target-dir-meta").write_text("0:700\n")
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elif name == "file-wrong-owner":
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target_keys.write_text("ssh-ed25519 target\n")
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(state / "target-key-meta").write_text("0:600\n")
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elif name == "root-target-account":
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target_keys.write_text("ssh-ed25519 target\n")
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(state / "target-uid").write_text("0\n")
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elif name == "relative-home":
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target_keys.write_text("ssh-ed25519 target\n")
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(state / "home").write_text("home/gib\n")
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elif name in (
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"safe-existing-key",
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"success-without-prior-dropin",
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"success-replaces-prior-dropin",
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"candidate-invalid",
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"candidate-reload-fails",
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"rollback-validation-fails",
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"rollback-reload-fails",
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):
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target_keys.write_text("ssh-ed25519 target\n")
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elif name == "safe-root-key-copy":
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root_keys.write_text("ssh-ed25519 root\n")
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else:
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raise ValueError(name)
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return fixture_root, stub_dir
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def run_case(name: str, **configuration: object) -> tuple[int, str, str, Path]:
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fixture_root, stub_dir = configure_case(name, **configuration)
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master, slave = pty.openpty()
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def attach_terminal() -> None:
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fcntl.ioctl(0, termios.TIOCSCTTY, 0)
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env = {
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**os.environ,
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"PATH": f"{stub_dir}:/usr/bin:/bin",
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"PANAMA_BOOT_FIXTURE_ROOT": str(fixture_root),
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"PANAMA_PATH": f"{fixture_root}/home/gib/.local/share/Panama",
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"HOME": f"{fixture_root}/root",
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}
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process = subprocess.Popen(
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["bash", boot, "--server"],
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stdin=slave,
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stdout=slave,
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stderr=slave,
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env=env,
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start_new_session=True,
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preexec_fn=attach_terminal,
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)
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os.close(slave)
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os.write(master, b"gib\nY\n")
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chunks: list[bytes] = []
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while True:
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try:
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chunk = os.read(master, 4096)
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except OSError as error:
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if error.errno == errno.EIO:
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break
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raise
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if not chunk:
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break
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chunks.append(chunk)
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os.close(master)
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status = process.wait()
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calls = (fixture_root / "calls").read_text()
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output = b"".join(chunks).decode(errors="replace")
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return status, output, calls, fixture_root
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unsafe_cases = (
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"missing",
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"empty",
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"comment-only",
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"ssh-directory-symlink",
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"authorized-keys-symlink",
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"directory-wrong-mode",
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"root-copy-directory-wrong-mode",
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"file-wrong-mode",
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"directory-wrong-owner",
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"file-wrong-owner",
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"root-target-account",
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"relative-home",
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)
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for case in unsafe_cases:
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status, output, calls, fixture_root = run_case(case)
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if status != 0:
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note(f"{case}: bootstrap stopped with status {status}: {output.strip()}")
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if "SSH hardening unavailable" not in output:
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note(f"{case}: unsafe login path did not explain why hardening was unavailable")
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if "sshd -t" in calls:
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note(f"{case}: unsafe login path validated sshd")
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if "systemctl reload" in calls:
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note(f"{case}: unsafe login path reloaded SSH")
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if (fixture_root / "etc/ssh/sshd_config.d/90-panama.conf").exists():
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note(f"{case}: unsafe login path changed the SSH drop-in")
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if case == "root-copy-directory-wrong-mode" and (
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fixture_root / "home/gib/.ssh/authorized_keys"
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).exists():
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note("root-copy-directory-wrong-mode: copied a root key into an unsafe SSH directory")
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if "install-handoff " not in calls:
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note(f"{case}: unsafe login path did not hand off to install")
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for case in ("safe-existing-key", "safe-root-key-copy"):
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status, output, calls, fixture_root = run_case(case)
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if status != 0:
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note(f"{case}: safe login path stopped with status {status}: {output.strip()}")
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if "SSH hardening unavailable" in output:
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note(f"{case}: safe login path was rejected")
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if "systemctl reload" not in calls:
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note(f"{case}: safe login path did not reach SSH hardening")
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if "install-handoff " not in calls:
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note(f"{case}: safe login path did not hand off to install")
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dropin = fixture_root / "etc/ssh/sshd_config.d/90-panama.conf"
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if (dropin.read_text() if dropin.exists() else "") != "PermitRootLogin no\nPasswordAuthentication no\n":
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note(f"{case}: safe login path did not write the expected SSH drop-in")
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if case == "safe-root-key-copy":
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keys = fixture_root / "home/gib/.ssh/authorized_keys"
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if not keys.exists() or keys.read_text() != "ssh-ed25519 root\n":
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note("safe-root-key-copy: root key was not copied to the target account")
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desired_dropin = b"PermitRootLogin no\nPasswordAuthentication no\n"
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prior_dropin = b"# prior Panama settings\nPasswordAuthentication yes\n"
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transaction_cases = {
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"success-without-prior-dropin": {
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"sshd_results": (0,),
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"reload_results": (0,),
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"prior_dropin": None,
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"sshd_unit": True,
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"ssh_unit": True,
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"succeeds": True,
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},
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"success-replaces-prior-dropin": {
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"sshd_results": (0,),
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"reload_results": (0,),
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"prior_dropin": prior_dropin,
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"sshd_unit": False,
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"ssh_unit": True,
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"succeeds": True,
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},
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"candidate-invalid": {
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"sshd_results": (1, 0),
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"reload_results": (),
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"prior_dropin": prior_dropin,
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"sshd_unit": True,
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"ssh_unit": True,
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"succeeds": False,
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},
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"candidate-reload-fails": {
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"sshd_results": (0, 0),
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"reload_results": (1, 0),
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"prior_dropin": prior_dropin,
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"sshd_unit": True,
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"ssh_unit": True,
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"succeeds": False,
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},
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"rollback-validation-fails": {
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"sshd_results": (0, 1),
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"reload_results": (1,),
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"prior_dropin": prior_dropin,
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"sshd_unit": True,
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"ssh_unit": True,
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"succeeds": False,
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"rollback_fails": True,
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},
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"rollback-reload-fails": {
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"sshd_results": (0, 0),
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"reload_results": (1, 1),
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"prior_dropin": prior_dropin,
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"sshd_unit": True,
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"ssh_unit": True,
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"succeeds": False,
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"rollback_fails": True,
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},
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}
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for case, expected in transaction_cases.items():
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configuration = {
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key: value
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for key, value in expected.items()
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if key not in {"succeeds", "rollback_fails"}
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}
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status, output, calls, fixture_root = run_case(case, **configuration)
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call_lines = calls.splitlines()
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dropin = fixture_root / "etc/ssh/sshd_config.d/90-panama.conf"
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sshd_dir = dropin.parent
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validations = [index for index, line in enumerate(call_lines) if line.startswith("sshd -t ")]
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reloads = [
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index
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for index, line in enumerate(call_lines)
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if line.startswith("systemctl reload ")
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]
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activation_lines = [
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(index, line)
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for index, line in enumerate(call_lines)
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if re.fullmatch(
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rf"mv -f -- {re.escape(str(sshd_dir))}/\.90-panama\.[A-Za-z0-9]+\.tmp "
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rf"{re.escape(str(dropin))} source-mode=600 ",
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line,
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)
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]
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restore_lines = [
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index
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for index, line in enumerate(call_lines)
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if re.fullmatch(
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rf"mv -f -- {re.escape(str(sshd_dir))}/\.90-panama\.[A-Za-z0-9]+\.restore "
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rf"{re.escape(str(dropin))} source-mode=600 ",
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line,
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)
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]
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succeeds = bool(expected["succeeds"])
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if succeeds and status != 0:
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note(f"{case}: transaction stopped with status {status}: {output.strip()}")
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if not succeeds and status == 0:
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note(f"{case}: failed transaction returned success")
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if succeeds and "install-handoff " not in calls:
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note(f"{case}: successful transaction did not hand off to install")
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if not succeeds and "install-handoff " in calls:
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note(f"{case}: failed transaction handed off to install")
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wanted_contents = desired_dropin if succeeds else prior_dropin
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actual_contents = dropin.read_bytes() if dropin.exists() else None
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if actual_contents != wanted_contents:
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note(f"{case}: SSH drop-in contents were not {'activated' if succeeds else 'restored'}")
|
|
|
|
if len(activation_lines) != 1:
|
|
note(f"{case}: candidate was not activated once through a restrictive same-directory rename")
|
|
if succeeds:
|
|
if len(validations) != 1 or len(reloads) != 1:
|
|
note(f"{case}: success did not validate once and reload once")
|
|
elif activation_lines and not activation_lines[0][0] < validations[0] < reloads[0]:
|
|
note(f"{case}: success did not activate, validate, then reload")
|
|
elif case == "candidate-invalid":
|
|
if len(validations) != 2 or reloads:
|
|
note(f"{case}: invalid candidate did not validate candidate and restoration without reload")
|
|
elif activation_lines and restore_lines and not (
|
|
activation_lines[0][0] < validations[0] < restore_lines[0] < validations[1]
|
|
):
|
|
note(f"{case}: rollback command order was wrong")
|
|
else:
|
|
if len(validations) != 2 or len(reloads) != 2:
|
|
note(f"{case}: reload failure did not validate and reload the restored configuration")
|
|
elif activation_lines and restore_lines and not (
|
|
activation_lines[0][0]
|
|
< validations[0]
|
|
< reloads[0]
|
|
< restore_lines[0]
|
|
< validations[1]
|
|
< reloads[1]
|
|
):
|
|
note(f"{case}: rollback command order was wrong")
|
|
|
|
if succeeds and restore_lines:
|
|
note(f"{case}: successful transaction performed a rollback")
|
|
if not succeeds and len(restore_lines) != 1:
|
|
note(f"{case}: prior drop-in was not restored exactly once")
|
|
|
|
detected_unit = "ssh.service" if case == "success-replaces-prior-dropin" else "sshd.service"
|
|
other_unit = "sshd.service" if detected_unit == "ssh.service" else "ssh.service"
|
|
reload_lines = [call_lines[index] for index in reloads]
|
|
if reload_lines and any(line != f"systemctl reload {detected_unit} " for line in reload_lines):
|
|
note(f"{case}: reloaded a unit other than detected {detected_unit}")
|
|
if any(line == f"systemctl reload {other_unit} " for line in call_lines):
|
|
note(f"{case}: guessed {other_unit} after reload failure")
|
|
if detected_unit == "sshd.service":
|
|
if "systemctl cat sshd.service " not in call_lines:
|
|
note(f"{case}: did not detect sshd.service")
|
|
if "systemctl cat ssh.service " in call_lines:
|
|
note(f"{case}: probed ssh.service after finding sshd.service")
|
|
elif not (
|
|
"systemctl cat sshd.service " in call_lines
|
|
and "systemctl cat ssh.service " in call_lines
|
|
and call_lines.index("systemctl cat sshd.service ")
|
|
< call_lines.index("systemctl cat ssh.service ")
|
|
):
|
|
note(f"{case}: did not fall back from absent sshd.service to ssh.service")
|
|
|
|
artifacts = list(sshd_dir.glob(".90-panama.*"))
|
|
rollback_fails = bool(expected.get("rollback_fails", False))
|
|
if not rollback_fails and artifacts:
|
|
note(f"{case}: successful or cleanly rolled-back transaction left temporary artifacts")
|
|
if rollback_fails:
|
|
backups = [artifact for artifact in artifacts if artifact.name.endswith(".backup")]
|
|
if len(backups) != 1:
|
|
note(f"{case}: rollback failure did not retain exactly one backup")
|
|
else:
|
|
backup = backups[0]
|
|
if backup.parent != sshd_dir or backup.read_bytes() != prior_dropin:
|
|
note(f"{case}: retained backup was not a same-directory byte copy")
|
|
if backup.stat().st_mode & 0o777 != 0o600:
|
|
note(f"{case}: retained backup permissions were not restrictive")
|
|
if str(backup.resolve()) not in output:
|
|
note(f"{case}: recovery output omitted the absolute backup path")
|
|
if "sshd -t" not in output or f"systemctl reload {detected_unit}" not in output:
|
|
note(f"{case}: recovery output omitted validation or reload commands")
|
|
|
|
artifact_logs = [line for line in call_lines if line.startswith("ssh-artifact ")]
|
|
if expected["prior_dropin"] is not None and not any(
|
|
re.fullmatch(
|
|
rf"ssh-artifact {re.escape(str(sshd_dir))}/\.90-panama\.[A-Za-z0-9]+\.backup 600 ",
|
|
line,
|
|
)
|
|
for line in artifact_logs
|
|
):
|
|
note(f"{case}: backup was not collision-safe, same-directory, non-.conf, and restrictive")
|
|
|
|
if findings:
|
|
print(f"root server bootstrap: {len(findings)} finding(s)", file=sys.stderr)
|
|
for finding in findings:
|
|
print(f" - {finding}", file=sys.stderr)
|
|
raise SystemExit(1)
|
|
|
|
print("root server bootstrap: PASS")
|
|
PY
|