mirror of
https://github.com/ItsDrike/dotfiles.git
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Use separate checksum file instead of modifying the executable
This commit is contained in:
ItsDrike
parent
06b39e5b5b
commit
cc85ab1e78
2 changed files with 80 additions and 157 deletions
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@ -1,66 +1,48 @@
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#!/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': '7d8962b4a2cd10cf4bc13da8949a4a6151b572d39e87b7125be55f882b16c4da',
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'/etc/pam.d/sudo': 'd1738818070684a5d2c9b26224906aad69a4fea77aabd960fc2675aee2df1fa2',
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'/etc/passwd': '28d6bec52ac5b4957a2c30dfcd15008dc1a39665c27abce97408489f3dbf02c9',
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'/etc/shadow': 'a24f72cba4cbc6b0a8433da2f4b011f31345068e3e5d6bebed6fb6a35769bd59',
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'/etc/ssh/sshd_config': '515db2484625122b4254472f7e673649e3d89b57577eaa29395017676735907b',
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'/bin/sudo': '0ffaf9e93a080ca1698837729641c283d24500d6cdd2cb4eb8e42427566a230e',
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'/bin/su': '3101438405d98e71e9eb68fbc5a33536f1ad0dad5a1c8aacd6da6c95ef082194',
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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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'/home/itsdrike/.ssh/authorized_keys': '674806197893dbf67d3c9ba3abf049d30e571de0c4b450fc9819d3e8b0f854cc',
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'/boot/vmlinuz-linux': '398e3771c5a5e06eebc317cb7c622c9d3217887b92671876e5b0fae0754cab13',
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'/boot/grub/grub.cfg': '39a57270f03a2fbd89f8e99af101ba34380a216a2cb2150268538c84480bc69c',
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}
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# default state of VERBOSE variable, this is controlled by flag
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# `--verbose`, and should probably be kept as false by default
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VERBOSE = False
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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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# TODO: Add color highlighting to help
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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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import colorama
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import json
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colorama.init(autoreset=True)
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# default verbosity state, controlled with `--verbose` flag
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VERBOSE = False
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# update ability is turned off by default, controlled with
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# `--update` flag. This is off to avoid need for user input
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# and only work with returned error codes, making it possible
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# to run this script easily with cronjobs or similar schedulers
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ENABLE_UPDATE = False
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# update automatically without asking the user first (will only
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# have effect if ENABLE_UPDATE is True - or turned by user), this
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# will still inform user about those files being updated, but user
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# won't be able to choose not to update
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AUTO_UPDATE = False
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# default path to the JSON file that stores known file checksums
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# this can be overrided by using `--checksum-file=path` flag
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CHECKSUM_FILE = '/usr/local/share/tamper-check/checksums.json'
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# This shouldn't be touched, entries in this list should be valid
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# path strings which are the new files that should be added to
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# CHECKSUM_FILE, controlled by flag `--add=/path/to/file`
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TO_ADD = []
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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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'tamper-check is a command line utility to automate checking for file edits.\n'
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'This is achieved by storing sha256 checksums of each added file and comparing them\n\n'
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'Accepted flags:\n'
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' `-u`/`--update`: If invalid checksum is found, ask user if it should be updated (y/n)\n'
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' `-a=path`/`--add=path`: Add a new file to the list of check entries\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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' `-e`/`--edit`: Edit this file using your $EDITOR (falls back to vi)\n'
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' `-f=path/--checksum-file=path: JSON file storing the file checksums, defaults to /usr/local/share/tamper-check/checksums.json\n`'
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' `-v`/`--verbose`: Verbose mode, show checksums on failures and some more info\n'
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' `-h`/`--help`: Show this help'
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)
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@ -77,71 +59,45 @@ def _yes_no(text, add_yn=True):
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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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def _get_checksum_dict(file):
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try:
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with open(file, 'r') as f:
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checksums = json.load(f)
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return checksums
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except FileNotFoundError:
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print(
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f'{colorama.Fore.YELLOW}Checksum file not found: {colorama.Fore.RESET}'
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f"'{colorama.Fore.BLUE}{file}{colorama.Fore.RESET}'{colorama.Fore.YELLOW} "
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'Creating new empty checksum file...'
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)
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os.makedirs(os.path.dirname(file), exist_ok=True)
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checksums = {}
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with open(file, 'w') as f:
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json.dump(checksums, f)
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return checksums
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if file_path in files:
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def _add_file(file_path, checksum, checksum_file, update_only=False):
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checksums = _get_checksum_dict(checksum_file)
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if file_path in checksums and not update_only:
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print(
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f"{colorama.Fore.RED}Path {colorama.Fore.RESET}"
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f"'{colorama.Fore.BLUE}{file_path}{colorama.Fore.RESET}' {colorama.Fore.RED}"
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"is already in the 'files' dictionary perhaps you wanted `--update`?"
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"is already in the checksum file 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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checksums[file_path] = checksum
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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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try:
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with open(this, 'w') as f:
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f.write(new_contents)
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with open(checksum_file, 'w') as f:
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json.dump(checksums, f)
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except PermissionError:
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print(
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f'{colorama.Fore.RED}PermissionError: {colorama.Fore.RESET}'
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'To add a new rule, you must have write access to: '
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f"'{colorama.Fore.BLUE}{this}{colorama.Fore.RESET}' (forgot sudo?)"
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)
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exit(2)
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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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try:
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with open(this, 'w') as f:
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f.write(new_contents)
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except PermissionError as e:
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print(
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f'{colorama.Fore.RED}PermissionError: {colorama.Fore.RESET}'
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'To update a rule, you must have write access to: '
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f"'{colorama.Fore.BLUE}{this}{colorama.Fore.RESET}' (forgot sudo?)"
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f"'{colorama.Fore.BLUE}{checksum_file}{colorama.Fore.RESET}' (forgot sudo?)"
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)
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exit(2)
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@ -153,10 +109,9 @@ def _get_checksum(file):
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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'{colorama.Fore.RED}File {colorama.Fore.RESET}'
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f"'{colorama.Fore.BLUE}{file}{colorama.Fore.RESET}'{colorama.Fore.RED} not found, "
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"can't produce sha256 checksum, check the 'files' dictionary on the top of the "
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'program and remove this entry.'
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f'{colorama.Fore.RED}FileNotFound: {colorama.Fore.RESET}'
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f"'{colorama.Fore.BLUE}{file}{colorama.Fore.RESET}' not found, can't produce "
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"sha256 checksum, check the checksum file and remove this entry"
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)
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exit(2)
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elif "Permission denied" in proc_stdout:
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@ -169,15 +124,14 @@ def _command_exists(command):
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return proc.returncode == 0
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def ask_update(file_path):
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def ask_update(file_path, checksum_file):
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new_checksum = _get_checksum(file_path)
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stored_checksum = files[file_path]
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file_line = f"'{colorama.Fore.BLUE}{file_path}{colorama.Fore.RESET}'"
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if AUTO_UPDATE or _yes_no(' - ' + file_line + ' update checksum?'):
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if AUTO_UPDATE:
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print(' - updating checksum for ' + file_line) # path won't get printed by _yes_no(), so print here
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result = _update_file(file_path, new_checksum, stored_checksum)
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result = _add_file(file_path, new_checksum, checksum_file, update_only=True)
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print(f'{colorama.Fore.GREEN} -> Updated')
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return result
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@ -185,53 +139,13 @@ def ask_update(file_path):
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return False
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def run_editor():
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try:
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editor = os.environ['EDITOR']
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except KeyError:
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for candidate in ('nvim', 'vim', 'vi', 'emacs', 'nano', 'ne', 'tilde'):
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if _command_exists(candidate):
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editor = candidate
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break
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else:
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print(f'{colorama.Fore.RED}Unable to find editor software, set {colorama.Fore.YELLOW}$EDITOR')
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exit(2)
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this = os.path.abspath(__file__)
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cmd = f'{editor} {this}'
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if not os.access(this, os.W_OK):
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if _command_exists('sudo'):
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cmd = 'sudo ' + cmd
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if VERBOSE:
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print(
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f'{colorama.Fore.CYAN}'
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f'Running editor in escalated mode ({colorama.Fore.YELLOW}sudo{colorama.Fore.CYAN})'
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)
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elif _command_exists('doas'):
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cmd = 'doas ' + cmd
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if VERBOSE:
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print(
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f'{colorama.Fore.CYAN}'
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'Running editor in escalated mode ({colorama.Fore.YELLOW}doas{colorama.Fore.CYAN})'
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)
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else:
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if VERBOSE:
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print(
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f'{colorama.Fore.RED}'
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'Running editor non-escalated, sudo/doas unaviable '
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f'({colorama.Fore.YELLOW}no write perms){colorama.Fore.RED}'
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)
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if VERBOSE:
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print(f'Starting editor: {colorama.Fore.YELLOW}{cmd}')
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return subprocess.run(cmd, shell=True)
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def run_check():
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checksums = _get_checksum_dict(CHECKSUM_FILE)
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not_matched = []
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for file, checksum in files.items():
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for file, checksum in checksums.items():
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try:
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sha256_sum = _get_checksum(file)
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except PermissionError as e:
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except PermissionError:
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print(
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f"Checksum of '{colorama.Fore.BLUE}{file}{colorama.Fore.RESET}': "
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f'{colorama.Fore.YELLOW}SKIPPED [PermissionError - no read perms]')
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@ -254,7 +168,7 @@ def run_check():
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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 VERBOSE, ENABLE_UPDATE, AUTO_UPDATE, TO_ADD
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global VERBOSE, ENABLE_UPDATE, AUTO_UPDATE, TO_ADD, CHECKSUM_FILE
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try:
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args = sys.argv[1:]
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@ -269,7 +183,7 @@ def analyze_args():
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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 or '-a=' in arg:
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elif arg.startswith('--add=') or arg.startswith('-a='):
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path = arg.replace('--add=', '').replace('-a=', '')
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if os.path.exists(path):
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path = os.path.abspath(path)
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@ -282,9 +196,16 @@ def analyze_args():
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exit(2)
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elif arg in ('-v', '--verbose'):
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VERBOSE = True
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elif arg in ('-e', '--edit'):
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run_editor()
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exit()
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elif arg.startswith('-f=') or arg.startswith('--checksum-file='):
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path = arg.replace('--checksum-file=', '').replace('-f=', '')
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if os.path.exists(path):
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path = os.path.abspath(path)
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CHECKSUM_FILE = path
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else:
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print(
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f'{colorama.Fore.RED}FileNotFoundError: {colorama.Fore.RESET}'
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f"'{colorama.Fore.BLUE}{path}{colorama.Fore.RESET}' -> invalid path"
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)
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elif arg in ('-h', '--help'):
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_print_help()
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exit()
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@ -301,7 +222,7 @@ if __name__ == '__main__':
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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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if _add_file(file, checksum, CHECKSUM_FILE):
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print(
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f"Added '{colorama.Fore.YELLOW}{file}{colorama.Fore.RESET}': "
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f"'{colorama.Fore.CYAN}{checksum}{colorama.Fore.RESET}'"
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@ -312,16 +233,17 @@ if __name__ == '__main__':
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not_matched = run_check()
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if len(not_matched) > 0 and ENABLE_UPDATE is True:
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print(f'\nFiles with mismatched checksums:')
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print('\nFiles with mismatched checksums:')
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unfixed = not_matched.copy()
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for mismatched_file in not_matched:
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if ask_update(mismatched_file) is True:
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if ask_update(mismatched_file, CHECKSUM_FILE) is True:
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# User did not choose to update the checksum
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unfixed.remove(mismatched_file)
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if len(unfixed) > 0:
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exit(1) # we still have some unfixed mismatched checksums, exit with 1
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exit(1) # we still have some unfixed mismatched checksums, exit with 1
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elif len(not_matched) > 0:
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print(f'\nFiles with mismatched checksums:')
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print('\nFiles with mismatched checksums:')
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for mismatched_file in not_matched:
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print(
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f'{colorama.Fore.RED} - '
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1
root/usr/local/share/tamper-check/checksums.json
Normal file
1
root/usr/local/share/tamper-check/checksums.json
Normal file
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@ -0,0 +1 @@
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{"/etc/pam.d/system-auth": "89d62406b2d623a76d53c33aca98ce8ee124ed4a450ff6c8a44cfccca78baa2f", "/etc/pam.d/su": "7d8962b4a2cd10cf4bc13da8949a4a6151b572d39e87b7125be55f882b16c4da", "/etc/pam.d/sudo": "d1738818070684a5d2c9b26224906aad69a4fea77aabd960fc2675aee2df1fa2", "/etc/passwd": "28d6bec52ac5b4957a2c30dfcd15008dc1a39665c27abce97408489f3dbf02c9", "/etc/shadow": "a24f72cba4cbc6b0a8433da2f4b011f31345068e3e5d6bebed6fb6a35769bd59", "/etc/ssh/sshd_config": "515db2484625122b4254472f7e673649e3d89b57577eaa29395017676735907b", "/bin/sudo": "4ff88367f05a314a98cf69d9949d8ca6b266cee6b93e9ff4d553b399ea472264", "/bin/su": "3101438405d98e71e9eb68fbc5a33536f1ad0dad5a1c8aacd6da6c95ef082194", "/usr/bin/passwd": "d4df1659159737bb4c08a430d493d257d75cdd93e18427946265ae5862a714c7", "/usr/bin/chsh": "6bc0ae69620dde18f7942e2573afb4a6200b10269612151f48f54ef8423a64fe", "/usr/bin/chfn": "63178af1347a62f58874640d38d605d3cb1bebe8092533787965ba317e8b553b", "/home/itsdrike/.ssh/authorized_keys": "674806197893dbf67d3c9ba3abf049d30e571de0c4b450fc9819d3e8b0f854cc", "/boot/vmlinuz-linux": "fcd97f4aa96cce36e0bd5d69a6135741a37019b57157c97ffceaf9f5f0e86f32", "/boot/grub/grub.cfg": "39a57270f03a2fbd89f8e99af101ba34380a216a2cb2150268538c84480bc69c", "/efi/EFI/GRUB/grubx64.efi": "511141419219eeabb86f8f585d9a186094d3a449c9126d667fe8d37bddccb46c"}
|
||||
Loading…
Add table
Add a link
Reference in a new issue