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213 lines
7.5 KiB
Python
Executable file
213 lines
7.5 KiB
Python
Executable file
#!/bin/python3
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# Dict of file paths with their sha256 checksums
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# make sure to run with `--auto-update` flag if you're running first time on this machine
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# to automatically update all stored checksums to new values
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files = {
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'/etc/pam.d/system-auth': '89d62406b2d623a76d53c33aca98ce8ee124ed4a450ff6c8a44cfccca78baa2f',
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'/etc/pam.d/su': 'ac2b504ba30d9a773e9b0b40b693dd79966cf390b619fcde41a66b79487a6b9e',
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'/etc/pam.d/sudo': 'd1738818070684a5d2c9b26224906aad69a4fea77aabd960fc2675aee2df1fa2',
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'/etc/pam.d/sddm': 'e80cd484ab66d47f50830464c7d60a9107d011d68c9c97855156859f3ae18ddc',
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'/etc/pam.d/kde': '00090291204baabe9d6857d3b1419832376dd2e279087d718b64792691e86739',
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'/bin/sudo': '0ffaf9e93a080ca1698837729641c283d24500d6cdd2cb4eb8e42427566a230e',
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'/bin/su': '3101438405d98e71e9eb68fbc5a33536f1ad0dad5a1c8aacd6da6c95ef082194',
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'/etc/ssh/sshd_config': '515db2484625122b4254472f7e673649e3d89b57577eaa29395017676735907b',
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'/etc/ssh/sshd_config': '515db2484625122b4254472f7e673649e3d89b57577eaa29395017676735907b',
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'/usr/bin/passwd': 'd4df1659159737bb4c08a430d493d257d75cdd93e18427946265ae5862a714c7',
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'/usr/bin/chsh': '6bc0ae69620dde18f7942e2573afb4a6200b10269612151f48f54ef8423a64fe',
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'/usr/bin/chfn': '63178af1347a62f58874640d38d605d3cb1bebe8092533787965ba317e8b553b',
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}
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# default state of ENABLE_UPDATE variable, this should be kept to false
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# to make sure this script can run as cronjob, not just manually by user
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# this variable will get set to True if the script is ran with `--update`
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ENABLE_UPDATE = False
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# default state of AUTO_UPDATE variable, this has no effect if above is
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# False, if not and this variable is True, user input is skipped entirely
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# and the checksums are updated automatically, otherwise user confirmation
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# is needed, controlled with `--no-confirm`, or `--auto-update`
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AUTO_UPDATE = False
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# default state of TO_ADD variable, this controls new files, checksums of
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# which should be added to the `files` dictionary, this is controlled
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# by flag `--add=/path/to/file`
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TO_ADD = []
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# -----------------------------------------------------------------------------------------------
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# - CODE PART, DON'T EDIT UNLESS YOU KNOW WHAT YOU'RE DOING -
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# -----------------------------------------------------------------------------------------------
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import subprocess
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import sys
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import os
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import re
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def _print_help(prepend_newline=False):
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if prepend_newline:
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print()
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print(
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'Accepted flags:\n'
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' `--update`: If invalid checksum is found, ask user if it should be updated (y/n)\n'
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' `--no-confirm`: Used in combination with `--update`, automatically assumes `y` for all questions\n'
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' `--auto-update`: Combines `--update` and `--no-confirm`\n'
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' `-h`/`--help`: Show this help'
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)
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def _yes_no(text, add_yn=True):
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if add_yn:
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text += ' (y/n): '
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while True:
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user_inp = input(text).lower()
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if user_inp in ('y', 'yes'):
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return True
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elif user_inp in ('n', 'no'):
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return False
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def _add_file(file_path, checksum):
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this = os.path.abspath(__file__)
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pattern = re.compile(r"files = \{\n(\s+)(['\"])(.+\n)+\}")
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if file_path in files:
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print(
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f"Unable to add '{file_path}', this file is already in the file dictionary, "
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"perhaps you wanted `--update`?"
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)
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return False
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with open(this, 'r') as f:
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contents = f.read()
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try:
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match = list(pattern.finditer(contents))[0]
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except IndexError:
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raise RuntimeError("Unable to detect files dict with regex, changed dict structure?")
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new_line = f"{match[1]}{match[2]}{file_path}{match[2]}: {match[2]}{checksum}{match[2]},\n"
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add_position = match.end() - 1 # before bracket symbol
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if not match[3].endswith(',\n'):
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add_position -= 1 # before newline character on non-comma line
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contents = contents[:add_position] + ',' + contents[add_position:]
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add_position += 2
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new_contents = contents[:add_position] + new_line + contents[add_position:]
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with open(this, 'w') as f:
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f.write(new_contents)
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return True
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def _update_file(file_path, new_checksum, stored_checksum):
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this = os.path.abspath(__file__)
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pattern = re.compile(rf"(\s+)(['\"]){file_path}['\"]:(\s+)['\"]{stored_checksum}['\"],?")
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with open(this, 'r') as f:
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contents = f.read()
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new_contents = re.sub(
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pattern,
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rf'\1\2{file_path}\2:\3\g<2>{new_checksum}\2,',
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contents
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)
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if contents == new_contents: # Line wasn't find, perhaps it's a new file?
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return False
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with open(this, 'w') as f:
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f.write(new_contents)
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return True
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def ask_update(file_path, new_checksum, stored_checksum):
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if not ENABLE_UPDATE:
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return False # only proceed if user input is enabled
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if AUTO_UPDATE or _yes_no('Do you wish to update this checksum?'):
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result = _update_file(file_path, new_checksum, stored_checksum)
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print(f"Updated '{file_path}' checksum entry\n")
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return result
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return False # return False if user didn't agree
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def _get_checksum(file):
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proc = subprocess.run(['sha256sum', file], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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proc_stdout = proc.stdout.decode('utf-8')
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if "No such file or directory" in proc_stdout:
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print(
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f"File '{file}' not found, can't produce sha256 checksum, "
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"check the 'files' dictionary on the top of the program and remove this entry."
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)
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exit(2)
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return proc_stdout.replace(f' {file}\n', '')
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def run_check():
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not_matched = []
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for file, checksum in files.items():
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sha256_sum = _get_checksum(file)
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if sha256_sum != checksum:
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print(f"WARNING: {file} doesn't match the checksum")
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print(f" -> detected: {sha256_sum}")
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print(f" -> stored: {checksum}")
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if ask_update(file, sha256_sum, checksum) is False:
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# User did not choose to update the checksum
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not_matched.append(file)
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return not_matched
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def analyze_args():
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# Using globals isn't usually ideal solution,
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# but it is the easiest way to handle this
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global ENABLE_UPDATE, AUTO_UPDATE, TO_ADD
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try:
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args = sys.argv[1:]
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except IndexError:
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return
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for arg in args:
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if arg == '--update':
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ENABLE_UPDATE = True
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elif arg == '--no-confirm':
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AUTO_UPDATE = True
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elif arg == '--auto-update':
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ENABLE_UPDATE = True
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AUTO_UPDATE = True
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elif '--add=' in arg:
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path = arg.replace('--add=', '')
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if os.path.exists(path):
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TO_ADD.append(path)
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else:
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print(f"Can't add {path} -> non-existent path")
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exit(2)
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elif arg in ('-h', '--help'):
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_print_help()
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exit()
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else:
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print(f'Unrecognized flag: {arg}')
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_print_help(prepend_newline=True)
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exit(2)
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if __name__ == '__main__':
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analyze_args()
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# if file adding was requested, handle it
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if len(TO_ADD) > 0:
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for file in TO_ADD:
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checksum = _get_checksum(file)
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if _add_file(file, checksum):
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print(f"Added '{file}': '{checksum}'")
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exit(0) # when adding files, don't run the check too
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# run the actual checksum verifier
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not_matched = run_check()
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if len(not_matched) > 0:
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exit(1) # exit with error code in case we have changed checksums
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else:
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print("All checksums are correct")
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