Mini Shell

#!/opt/imh-python/bin/python3
"""Search for and kill old moveuser keys"""
import os
import sys
import time

SSH_ROOT = '/home/moveuser/.ssh'
AGE = 604800  # 7 days in seconds


def main():
    """Search for and kill old moveuser keys"""
    try:
        found = os.listdir(SSH_ROOT)
    except OSError:
        print(SSH_ROOT, 'is missing; nothing to do')
        sys.exit(0)
    auth_found = 'authorized_keys' in found
    found = [
        os.path.join(SSH_ROOT, x)
        for x in found
        if x.endswith('.key') or x.endswith('.config')
    ]
    if auth_found:
        clean_auth()
    clean_found(found)
    print('done.')


def clean_auth():
    """Remove public keys older than 2 days"""
    auth_path = os.path.join(SSH_ROOT, 'authorized_keys')
    cutoff = time.time() - AGE
    fixed = []
    with open(auth_path, encoding='utf-8') as auth_file:
        auth_data = auth_file.readlines()
    for line in auth_data:
        items = line.strip().split()
        if not items:  # blank line
            continue
        if items[0] != "ssh-rsa":  # the only one we actually use
            print('removed(invalid):', line)
            continue  # invalid line
        comment_last = items[-1]
        try:
            stamp = get_stamp(comment_last)
        except ValueError:  # missing a timestamp
            # add it to be expired in 2 days
            fixed.append(f'{line} {time.time() + AGE}')
            print('added expiration:', line)
            continue
        if stamp > cutoff:
            fixed.append(line)
        else:
            print('removed(old):', line)
    with open(auth_path, 'w', encoding='utf-8') as auth_file:
        auth_file.write('\n'.join(fixed))
        auth_file.write('\n')


def get_stamp(comment_last: str) -> int:
    """Try to get the timestamp placed by SNM in authorized_keys"""
    try:
        # it was just a column with a float timestamp
        return int(float(comment_last))
    except ValueError:
        pass
    # try to get it as comment_timestamp
    return int(float(comment_last.split('_')[-1]))


def clean_found(found: list[str]):
    """Remove private keys and ssh configs older than 7 days"""
    cutoff = time.time() - AGE
    for item in found:
        if os.stat(item).st_mtime < cutoff:
            print('removed(old):', item)
            os.remove(item)


if __name__ == '__main__':
    main()