613 lines
28 KiB
Python
Executable File
613 lines
28 KiB
Python
Executable File
#!/usr/bin/env python3
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import getopt
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import json
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import os
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import sys
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import time
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from os.path import join, dirname
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from sys import _getframe as frame
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import tomli
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from dotenv import load_dotenv
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##############################################################################################
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# General process environment handlers #
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##############################################################################################
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# Define paths: wazuh_path = wazuh root directory
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# log_path = wazuh-notify.log,
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# config_path = wazuh-notify-config.toml
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def set_environment() -> tuple:
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set_wazuh_path = os.path.abspath(os.path.join(__file__, '../../..'))
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set_log_path = '{0}/logs/wazuh-notify.log'.format(set_wazuh_path)
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set_config_path = '{0}/etc/wazuh-notify-config.toml'.format(set_wazuh_path)
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return set_wazuh_path, set_log_path, set_config_path
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wazuh_path, log_path, config_path = set_environment()
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def set_time_format() -> tuple:
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now_message = time.strftime('%A, %d %b %Y %H:%M:%S')
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now_logging = time.strftime('%Y-%m-%d %H:%M:%S')
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now_time = time.strftime('%H:%M')
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now_weekday = time.strftime('%A')
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return now_message, now_logging, now_weekday, now_time
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# Logger: print to console and/or log to file
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def logger(level: int, config: dict, me: str, him: str, message: str) -> None:
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_, now_logging, _, _ = set_time_format()
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logger_wazuh_path, logger_log_path, _ = set_environment()
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# When logging from main(), the destination function is called '<module>'. For cosmetic reasons rename to 'main'.
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him: str = 'main' if him == '<module>' else him
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log_line: str = f'{now_logging} | {level} | {me: <27} | {him: <27} | {message}'
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# Compare the extended_print log level in the configuration to the log level of the message.
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if config.get('python').get('extended_print', 0) >= level:
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print(log_line)
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try:
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# Compare the extended_logging level in the configuration to the log level of the message.
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with open(logger_log_path, mode='a') as log_file:
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if config.get('python').get('extended_logging', 0) >= level:
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log_file.write(log_line)
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else:
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now_logging = 'Timestamp'
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level = 'Lvl'
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him = 'Origination function'
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me = 'Executed function'
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message = 'Information'
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log_line: str = f'\n{now_logging: <19} |{level: <3}| {me: <27} | {him: <27} | {message}'
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log_file.write(log_line + '\n')
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now_logging = '------------------'
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level = '---'
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him = '---------------------------'
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me = '---------------------------'
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message = '------------------------------------------------'
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log_line: str = f'\n{now_logging: <19} |{level: <3}| {me: <27} | {him: <27} | {message}'
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log_file.write(log_line + '\n')
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except (FileNotFoundError, PermissionError, OSError):
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# Special message to console when logging to file fails and console logging might not be set.
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log_line: str = f'{now_logging} | {level} | {me: <27} | {him: <17} | error opening log file: {logger_log_path}'
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print(log_line)
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# Get the content of the .env file (url's and/or webhooks).
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def get_env() -> tuple:
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# The 'me' variable sets the called function (current function), the 'him' the calling function. Used for logging.
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me: str = frame(0).f_code.co_name
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him: str = frame(1).f_code.co_name
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# Write the configuration to a dictionary.
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config: dict = get_config()
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logger(level=2, config=config, me=me, him=him, message=f'Configuration retrieved to dictionary')
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# Check if the secrets .env file is available.
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try:
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dotenv_path = join(dirname(__file__), '.env')
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load_dotenv(dotenv_path)
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if not os.path.isfile(dotenv_path):
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logger(level=0, config=config, me=me, him=him, message=f'%s not found' % dotenv_path)
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raise Exception(dotenv_path, 'file not found')
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# Retrieve URLs from .env
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discord_url = os.getenv('DISCORD_URL')
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logger(level=2, config=config, me=me, him=him, message=f'DISCORD_URL: %s' % discord_url)
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ntfy_url = os.getenv('NTFY_URL')
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logger(level=2, config=config, me=me, him=him, message=f'NTFY_URL: %s' % ntfy_url)
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slack_url = os.getenv('SLACK_URL')
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logger(level=2, config=config, me=me, him=him, message=f'SLACK_URL: %s' % slack_url)
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except Exception as err:
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# output error, and return with an error code
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logger(level=0, config=config, me=me, him=him, message=f'Error reading %s' % err)
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exit(err)
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logger(level=2, config=config, me=me, him=him, message=f'%s loaded' % dotenv_path)
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return discord_url, ntfy_url, slack_url
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# Read and process configuration settings from wazuh-notify-config.toml and create dictionary.
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def get_config() -> dict:
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me: str = frame(0).f_code.co_name
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him: str = frame(1).f_code.co_name
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this_config_path: str = ''
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config: dict = {}
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try:
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_, _, this_config_path = set_environment()
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with open(this_config_path, 'rb') as ntfier_config:
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config: dict = tomli.load(ntfier_config)
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except (FileNotFoundError, PermissionError, OSError):
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logger(level=2, config=config, me=me, him=him, message=f'Error accessing configuration: %s' % this_config_path)
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logger(level=2, config=config, me=me, him=him, message=f'Reading TOML configuration file: %s' % this_config_path)
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config['targets']: str = config.get('general').get('targets', 'discord, slack, ntfy')
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config['full_alert']: bool = config.get('general').get('full_alert', False)
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config['excluded_rules']: str = config.get('general').get('excluded_rules', '')
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config['excluded_agents']: str = config.get('general').get('excluded_agents', '')
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config['priority_map']: dict = config.get('priority_map', [])
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config['sender']: str = config.get('general').get('sender', 'Wazuh (IDS)')
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config['click']: str = config.get('general').get('click', 'https://wazuh.com')
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config['md_e']: str = config.get('general').get('markdown_emphasis', '')
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config['excluded_days']: list = config.get('python').get('excluded_days', '')
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config['excluded_hours']: list = config.get('python').get('excluded_hours', '')
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config['test_mode']: bool = config.get('python').get('test_mode', False)
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config['extended_logging']: int = config.get('python').get('extended_logging', 0)
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config['extended_print']: int = config.get('python').get('extended_print', 0)
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return config
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def view_config() -> None:
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_, _, this_config_path, _ = set_environment()
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try:
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with open(this_config_path, 'r') as ntfier_config:
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print(ntfier_config.read())
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except (FileNotFoundError, PermissionError, OSError):
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print(f'%s does not exist or is not accessible' % this_config_path)
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return
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# Get script arguments during execution. Params found here override config settings.
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def get_arguments() -> dict:
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me: str = frame(0).f_code.co_name
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him: str = frame(1).f_code.co_name
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config: dict = get_config()
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logger(level=2, config=config, me=me, him=him, message=f'Configuration retrieved to dictionary')
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# Short options
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options: str = 'u:s:p:m:t:c:hv'
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# Long options
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long_options: list = ['url=',
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'sender=',
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'targets=',
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'priority=',
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'message=f',
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'tags=',
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'click=',
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'help',
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'view'
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]
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help_text: str = '''
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-u, --url is the url for the server, ending with a '/'.
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-s, --sender is the sender of the message, either an app name or a person.
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-d, --targets is the list of platforms to send a message to (slack, ntfy, discord)
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-p, --priority is the priority of the message, ranging from 1 (lowest), to 5 (highest).
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-m, --message is the text of the message to be sent.
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-t, --tags is an arbitrary strings of tags (keywords), seperated by a ',' (comma).
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-c, --click is a link (URL) that can be followed by tapping/clicking inside the message.
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-h, --help shows this help message. Must have no value argument.
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-v, --view show config.
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'''
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url: str = ''
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sender: str = ''
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targets: str = ''
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message: str = ''
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priority: int = 0
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tags: str = ''
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click: str = ''
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# Fetch the arguments from the command line, skipping the first argument (name of the script).
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argument_list: list = sys.argv[1:]
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logger(level=2, config=config, me=me, him=him, message=f'Found arguments: %s' % argument_list)
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if not argument_list:
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logger(level=1, config=config, me=me, him=him,
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message=f'No argument list found (no arguments provided with script execution')
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# Store defaults for the non-existing arguments in the arguments dictionary to avoid None errors.
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arguments: dict = {'url': url,
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'sender': sender,
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'targets': targets,
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'message': message,
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'priority': priority,
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'tags': tags,
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'click': click}
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return arguments
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else:
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try:
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# Parsing arguments
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p_arguments, values = getopt.getopt(argument_list, options, long_options)
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logger(level=2, config=config, me=me, him=him, message=f'Parsing arguments')
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# Check each argument. Arguments that are present will override the defaults.
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for current_argument, current_value in p_arguments:
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if current_argument in ('-h', '--help'):
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print(help_text)
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exit()
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elif current_argument in ('-v', '--view'):
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view_config()
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exit()
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elif current_argument in ('-u', '--url'):
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url: str = current_value
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elif current_argument in ('-s', '--sender'):
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sender: str = current_value
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elif current_argument in ('-d', '--targets'):
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targets: str = current_value
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elif current_argument in ('-p', '--priority'):
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priority: int = int(current_value)
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elif current_argument in ('-m', '--message'):
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message: str = current_value
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elif current_argument in ('-t', '--tags'):
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tags: str = current_value
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elif current_argument in ('-c', '--click'):
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click: str = current_value
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except getopt.error as err:
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# Output error, and return error code
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logger(level=0, config=config, me=me, him=him, message=f'Error during argument parsing: %s' % err)
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logger(level=2, config=config, me=me, him=him, message=f'Arguments returned as dictionary')
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# Store the arguments in the arguments dictionary.
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arguments: dict = {'url': url, 'sender': sender, 'targets': targets, 'message': message,
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'priority': priority, 'tags': tags, 'click': click}
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return arguments
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##############################################################################################
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# Wazuh event handling #
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##############################################################################################
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# Receive and load message from Wazuh
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def load_message() -> dict:
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me: str = frame(0).f_code.co_name
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him: str = frame(1).f_code.co_name
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config: dict = get_config()
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logger(level=2, config=config, me=me, him=him, message=f'Loading event message from STDIN')
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input_str: str = ''
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for line in sys.stdin:
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input_str: str = line
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break
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data: json = json.loads(input_str)
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if data.get('command') == 'add':
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logger(level=1, config=config, me=me, him=him, message=f'Relevant event data found')
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return data
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else:
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logger(level=0, config=config, me=me, him=him, message=f'Event data not found')
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sys.exit(1)
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def check_test_mode(config) -> dict:
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me: str = frame(0).f_code.co_name
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him: str = frame(1).f_code.co_name
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if config.get('python').get('test_mode'):
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logger(level=1, config=config, me=me, him=him,
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message=f'Running in test mode: using test message wazuh-notify-test-event.json')
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# Load the test event data.
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home_path, _, _ = set_environment()
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with (open(home_path + '/etc/wazuh-notify-test-event.json') as event_file):
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data: dict = json.loads(event_file.read())
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else:
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# We are running live. Load the data from the Wazuh process.
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logger(level=2, config=config, me=me, him=him, message=f'Running in live mode: using live message')
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data: dict = load_message()
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return data
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# Check if there are reasons not to process this event. Check exclusions for rules, agents, days and hours from config.
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def exclusions_check(config, alert) -> bool:
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me: str = frame(0).f_code.co_name
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him: str = frame(1).f_code.co_name
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now_message, now_logging, now_weekday, now_time = set_time_format()
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logger(level=2, config=config, me=me, him=him, message=f'Get datetime formats for evaluation purposes.')
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logger(level=1, config=config, me=me, him=him, message=f'Checking if we are outside of the exclusion rules: ')
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ex_hours: tuple = config.get('python').get('excluded_hours')
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ex_days: str = config.get('python').get('excluded_days')
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ex_agents: str = config.get('general').get('excluded_agents')
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ex_rules: str = config.get('general').get('excluded_rules')
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# Get agent and rule from within the event.
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ev_agent: str = alert['agent']['id']
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ev_rule: str = alert['rule']['id']
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# Start hour may not be later than end hours. End hour may not exceed 00:00 midnight to avoid day jump.
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ex_hours: tuple = [ex_hours[0], '23:59'] if (ex_hours[1] >= '23:59' or ex_hours[1] < ex_hours[0]) else ex_hours
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# Let's assume all lights are green, until proven otherwise.
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ex_hours_eval, ex_weekday_eval, ev_rule_eval, ev_agent_eval = True, True, True, True
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# Evaluate the conditions for sending a notification. Any False will cause the notification to be discarded.
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if (now_time > ex_hours[0]) and (now_time < ex_hours[1]):
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logger(level=2, config=config, me=me, him=him, message=f'excluded: event inside exclusion time frame')
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ex_hours_eval = False
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elif now_weekday in ex_days:
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logger(level=2, config=config, me=me, him=him, message=f'excluded: event inside excluded weekdays')
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ex_weekday_eval = False
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elif ev_rule in ex_rules:
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logger(level=2, config=config, me=me, him=him, message=f'excluded: event id inside exclusion list')
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ev_rule_eval = False
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elif ev_agent in ex_agents:
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logger(level=2, config=config, me=me, him=him, message=f'excluded: event agent inside exclusion list')
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ev_rule_eval = False
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notification_eval: bool = True if (ex_hours_eval and ex_weekday_eval and ev_rule_eval and ev_agent_eval) else False
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logger(level=1, config=config, me=me, him=him,
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message=f'Exclusion rules evaluated. Process event is %s' % notification_eval)
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return notification_eval
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# Map the event threat level to the appropriate 5-level priority scale and color for use in the notification platforms.
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def threat_mapping(config, threat_level, fired_times):
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me: str = frame(0).f_code.co_name
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him: str = frame(1).f_code.co_name
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# Map threat level to priority. Enters Homeland Security :-).
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p_map: dict = config.get('priority_map')
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logger(level=2, config=config, me=me, him=him, message=f'Threat mapping: priority mapped to: %s' % p_map)
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for i in range(len(p_map)):
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logger(level=2, config=config, me=me, him=him, message=f'Threat mapping: list loop counter: %s' % i)
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logger(level=2, config=config, me=me, him=him, message=f'Threat mapping: threat level found: %s' % threat_level)
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if threat_level in p_map[i]['threat_map']:
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color_mapping: dict = p_map[i]['color']
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priority_mapping = 5 - i
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logger(level=2, config=config, me=me, him=him,
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message=f'Threat mapping: priority %s and color %s' % (priority_mapping, color_mapping))
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if fired_times >= p_map[i]['notify_threshold']:
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logger(level=2, config=config, me=me, him=him,
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message=f'The notification_threshold prevents this message from sending')
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exit(0)
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if fired_times >= p_map[i]['mention_threshold']:
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# When this flag is set, Discord!! recipients get a stronger message (DM).
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mention_flag = '@here'
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logger(level=2, config=config, me=me, him=him,
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message=f'Threat mapping: mention flag: %s' % mention_flag)
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else:
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mention_flag = ''
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logger(level=2, config=config, me=me, him=him,
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message=f'Threat level mapped as: priority: %s color: %s mention: %s'
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% (priority_mapping, color_mapping, mention_flag))
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return priority_mapping, color_mapping, mention_flag
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logger(level=0, config=config, me=me, him=him, message=f'Threat level mapping failed! Returning (99, 99, 99)')
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return 99, 99, '99'
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##############################################################################################
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# Common notification preparation #
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##############################################################################################
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# Construct the message that will be sent to the notifier platforms.
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def construct_message_body(caller, config, arguments, alert) -> str:
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me: str = frame(0).f_code.co_name
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him: str = frame(1).f_code.co_name
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logger(level=2, config=config, me=me, him=him, message=f'%s: Constructing message body' % caller)
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# Include a specific control sequence for markdown bold parameter names.
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# todo To be fixed
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md_map = config.get('markdown_emphasis', '')
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md_e = md_map[caller]
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logger(level=2, config=config, me=me, him=him, message=caller + 'Emphasis string used: ' + md_e)
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# If the --message (-m) argument was fulfilled, use this message to be sent.
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if arguments['message']:
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message_body = arguments['message']
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else:
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_, timestamp, _, _ = set_time_format()
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message_body: str = \
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(
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md_e + 'Timestamp:' + md_e + ' ' + timestamp + '\n' +
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md_e + 'Agent:' + md_e + ' ' + alert['agent']['name'] + ' (' + alert['agent']['id'] + ')' + '\n' +
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md_e + 'Rule id:' + md_e + ' ' + alert['rule']['id'] + '\n' +
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md_e + 'Rule:' + md_e + ' ' + alert['rule']['description'] + '\n' +
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md_e + 'Description:' + md_e + ' ' + alert['full_log'] + '\n' +
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md_e + 'Threat level:' + md_e + ' ' + str(alert['rule']['level']) + '\n' +
|
|
md_e + 'Times fired:' + md_e + ' ' + str(alert['rule']['firedtimes']) + '\n'
|
|
)
|
|
logger(level=2, config=config, me=me, him=him,
|
|
message=f'%s basic message constructed.\n%s' % (caller, message_body))
|
|
return message_body
|
|
|
|
|
|
# Construct the notification (message + additional information) that will be sent to the notifier platforms.
|
|
def prepare_payload(caller, config, arguments, message_body, alert, priority):
|
|
me: str = frame(0).f_code.co_name
|
|
him: str = frame(1).f_code.co_name
|
|
|
|
logger(level=2, config=config, me=me, him=him, message=f'Payload being constructed.')
|
|
|
|
md_map = config.get('markdown_emphasis', '')
|
|
md_e = md_map[caller]
|
|
logger(level=2, config=config, me=me, him=him, message=f'%s: emphasis string used: %s' % (caller, md_e))
|
|
|
|
priority: str = str(priority)
|
|
tags = (str(alert['rule']['groups']).replace('[', '')
|
|
.replace(']', '')
|
|
.replace("'", '')
|
|
.replace(',', ', ')
|
|
)
|
|
logger(level=2, config=config, me=me, him=him, message=f'Full event formatted.')
|
|
|
|
full_event: str = str(json.dumps(alert, indent=4)
|
|
.replace('"', '')
|
|
.replace('{', '')
|
|
.replace('}', '')
|
|
.replace('[', '')
|
|
.replace(']', '')
|
|
.replace(',', ' ')
|
|
)
|
|
# Fill some of the variables with argument values if available.
|
|
|
|
priority = arguments['priority'] if arguments['priority'] else priority
|
|
tags = arguments['tags'] if arguments['tags'] else tags
|
|
sender: str = config.get('general').get('sender', 'Wazuh (IDS)')
|
|
sender = arguments['sender'] if arguments['sender'] else sender
|
|
click: str = config.get('general').get('click', 'https://wazuh.com')
|
|
click = arguments['click'] if arguments['click'] else click
|
|
|
|
# Add the full alert data to the notification.
|
|
if caller in config['full_alert']:
|
|
logger(level=2, config=config, me=me, him=him, message=caller + 'Full alert data will be attached.')
|
|
# Add the full alert data to the notification body
|
|
notification_body: str = ('\n\n' + message_body + '\n' +
|
|
md_e + '__Full event__' + md_e + '\n' + '```\n' + full_event + '```')
|
|
else:
|
|
notification_body: str = message_body
|
|
|
|
# Add priority & tags to the notification body
|
|
notification_body = (notification_body + '\n\n' + md_e + 'Priority:' + md_e + ' ' + str(priority) + '\n' +
|
|
md_e + 'Tags:' + md_e + ' ' + tags + '\n\n' + click)
|
|
logger(level=2, config=config, me=me, him=him, message=f'Adding priority and tags')
|
|
|
|
config['targets'] = arguments['targets'] if arguments['targets'] != '' else config['targets']
|
|
|
|
return notification_body, click, sender
|
|
|
|
|
|
##############################################################################################
|
|
# Platform specific notification creation and handling #
|
|
##############################################################################################
|
|
|
|
|
|
# Build the notification for this specific platform.
|
|
def build_discord_notification(config, notification_body, color, mention, sender):
|
|
me: str = frame(0).f_code.co_name
|
|
him: str = frame(1).f_code.co_name
|
|
logger(level=2, config=config, me=me, him=him, message=f'Discord payload created')
|
|
|
|
payload_json = {'username': sender,
|
|
'content': mention,
|
|
'embeds': [{'description': notification_body,
|
|
'color': color,
|
|
'title': sender}]}
|
|
logger(level=2, config=config, me=me, him=him, message=f'Discord notification built')
|
|
return '', '', payload_json
|
|
|
|
|
|
# Build the notification for this specific platform.
|
|
def build_ntfy_notification(config, notification_body, priority, click, sender):
|
|
me: str = frame(0).f_code.co_name
|
|
him: str = frame(1).f_code.co_name
|
|
logger(level=2, config=config, me=me, him=him, message=f'Ntfy payloads created')
|
|
|
|
payload_data = notification_body
|
|
payload_headers = {'Markdown': 'yes',
|
|
'Title': sender,
|
|
'Priority': str(priority),
|
|
'Click': click}
|
|
logger(level=2, config=config, me=me, him=him, message=f'Ntfy notification built')
|
|
return payload_headers, payload_data, ''
|
|
|
|
|
|
# Build the notification for this specific platform.
|
|
def build_slack_notification(config, notification_body, color, mention, sender):
|
|
me: str = frame(0).f_code.co_name
|
|
him: str = frame(1).f_code.co_name
|
|
logger(level=2, config=config, me=me, him=him, message=f'Slack payload created')
|
|
|
|
notification_body = '*' + sender + '*' + '\n\n' + notification_body
|
|
|
|
payload_json = {'username': sender, 'text': notification_body}
|
|
logger(level=2, config=config, me=me, him=him, message=f'Slack notification built')
|
|
return '', '', payload_json
|
|
|
|
|
|
# Handle the complete notification generation for this specific platform.
|
|
def handle_discord_notification(config, arguments, alert, color, priority, mention):
|
|
me: str = frame(0).f_code.co_name
|
|
him: str = frame(1).f_code.co_name
|
|
|
|
logger(level=1, config=config, me=me, him=him, message=f'Process discord notification: start')
|
|
|
|
# Load the url/webhook from the configuration.
|
|
discord_url, _, _ = get_env()
|
|
discord_url = arguments['url'] if arguments['url'] else discord_url
|
|
|
|
# Build the basic message content.
|
|
message_body: str = construct_message_body(caller='discord', config=config, arguments=arguments, alert=alert)
|
|
|
|
# Common preparation of the notification.
|
|
notification_body, click, sender = prepare_payload(caller='discord', config=config, arguments=arguments,
|
|
message_body=message_body, alert=alert, priority=priority)
|
|
|
|
# Build the payload(s) for the POST request.
|
|
_, _, payload_json = build_discord_notification(config=config, notification_body=notification_body, color=color,
|
|
mention=mention, sender=sender)
|
|
|
|
logger(level=1, config=config, me=me, him=him, message=f'Process discord notification: done')
|
|
return payload_json, discord_url
|
|
|
|
|
|
# Handle the complete notification generation for this specific platform.
|
|
def handle_ntfy_notification(config, arguments, alert, priority):
|
|
me: str = frame(0).f_code.co_name
|
|
him: str = frame(1).f_code.co_name
|
|
|
|
logger(level=1, config=config, me=me, him=him, message=f'Process ntfy notification: start')
|
|
|
|
# Load the url/webhook from the configuration.
|
|
_, ntfy_url, _ = get_env()
|
|
ntfy_url = arguments['url'] if arguments['url'] else ntfy_url
|
|
|
|
# Build the basic message content.
|
|
message_body: str = construct_message_body(caller='ntfy', config=config, arguments=arguments, alert=alert)
|
|
|
|
# Special blank line after the title of the message.
|
|
message_body = ' \n' + message_body
|
|
|
|
# Common preparation of the notification.
|
|
notification_body, click, sender = prepare_payload(caller='ntfy', config=config, arguments=arguments,
|
|
message_body=message_body, alert=alert, priority=priority)
|
|
|
|
# Build the payload(s) for the POST request.
|
|
payload_headers, payload_data, _ = build_ntfy_notification(config=config, notification_body=notification_body,
|
|
priority=priority, click=click, sender=sender)
|
|
|
|
logger(level=1, config=config, me=me, him=him, message=f'Process ntfy notification: done')
|
|
return payload_data, payload_headers, ntfy_url
|
|
|
|
|
|
# Handle the complete notification generation for this specific platform.
|
|
def handle_slack_notification(config, arguments, alert, color, priority, mention):
|
|
me: str = frame(0).f_code.co_name
|
|
him: str = frame(1).f_code.co_name
|
|
|
|
logger(level=1, config=config, me=me, him=him, message=f'Process slack notification: start')
|
|
|
|
# Load the url/webhook from the configuration.
|
|
_, _, slack_url = get_env()
|
|
slack_url = arguments['url'] if arguments['url'] else slack_url
|
|
|
|
# Build the basic message content.
|
|
message_body: str = construct_message_body(caller='slack', config=config, arguments=arguments, alert=alert)
|
|
|
|
# Common preparation of the notification.
|
|
notification_body, click, sender = prepare_payload(caller='slack', config=config, arguments=arguments,
|
|
message_body=message_body, alert=alert, priority=priority)
|
|
|
|
# Build the payload(s) for the POST request.
|
|
_, _, payload_json = build_slack_notification(config=config, notification_body=notification_body, color=color,
|
|
mention=mention, sender=sender)
|
|
|
|
logger(level=1, config=config, me=me, him=him, message=f'Process slack notification: done')
|
|
return payload_json, slack_url
|