#!/usr/bin/python3 import re import dateutil.parser import mailconfig import utils def scan_mail_log(logger, env): collector = { "other-services": set(), "imap-logins": { }, "postgrey": { }, "rejected-mail": { }, } collector["real_mail_addresses"] = set(mailconfig.get_mail_users(env)) | set(alias[0] for alias in mailconfig.get_mail_aliases(env)) with open("/var/log/mail.log") as log: for line in log: scan_mail_log_line(line.strip(), collector) if collector["imap-logins"]: logger.add_heading("Recent IMAP Logins") logger.print_block("The most recent login from each remote IP adddress is show.") for k in utils.sort_email_addresses(collector["imap-logins"], env): for ip, date in sorted(collector["imap-logins"][k].items(), key = lambda kv : kv[1]): logger.print_line(k + "\t" + str(date) + "\t" + ip) if collector["postgrey"]: logger.add_heading("Greylisted Mail") logger.print_block("The following mail was greylisted, meaning the emails were temporarily rejected. Legitimate senders will try again within ten minutes.") logger.print_line("recipient" + "\t" + "received" + "\t" + "sender" + "\t" + "delivered") for recipient in utils.sort_email_addresses(collector["postgrey"], env): for (client_address, sender), (first_date, delivered_date) in sorted(collector["postgrey"][recipient].items(), key = lambda kv : kv[1][0]): logger.print_line(recipient + "\t" + str(first_date) + "\t" + sender + "\t" + (("delivered " + str(delivered_date)) if delivered_date else "no retry")) if collector["rejected-mail"]: logger.add_heading("Rejected Mail") logger.print_block("The following incoming mail was rejected.") for k in utils.sort_email_addresses(collector["rejected-mail"], env): for date, sender, message in collector["rejected-mail"][k]: logger.print_line(k + "\t" + str(date) + "\t" + sender + "\t" + message) logger.add_heading("Other") logger.print_block("Unrecognized services in the log: " + ", ".join(collector["other-services"])) def scan_mail_log_line(line, collector): m = re.match(r"(\S+ \d+ \d+:\d+:\d+) (\S+) (\S+?)(\[\d+\])?: (.*)", line) if not m: return date, system, service, pid, log = m.groups() date = dateutil.parser.parse(date) if service == "dovecot": scan_dovecot_line(date, log, collector) elif service == "postgrey": scan_postgrey_line(date, log, collector) elif service == "postfix/smtpd": scan_postfix_smtpd_line(date, log, collector) elif service in ("postfix/qmgr", "postfix/pickup", "postfix/cleanup", "postfix/scache", "spampd", "postfix/anvil", "postfix/master", "opendkim", "postfix/lmtp", "postfix/tlsmgr"): # nothing to look at pass else: collector["other-services"].add(service) def scan_dovecot_line(date, log, collector): m = re.match("imap-login: Login: user=<(.*?)>, method=PLAIN, rip=(.*?),", log) if m: login, ip = m.group(1), m.group(2) if ip != "127.0.0.1": # local login from webmail/zpush collector["imap-logins"].setdefault(login, {})[ip] = date def scan_postgrey_line(date, log, collector): m = re.match("action=(greylist|pass), reason=(.*?), (?:delay=\d+, )?client_name=(.*), client_address=(.*), sender=(.*), recipient=(.*)", log) if m: action, reason, client_name, client_address, sender, recipient = m.groups() key = (client_address, sender) if action == "greylist" and reason == "new": collector["postgrey"].setdefault(recipient, {})[key] = (date, None) elif action == "pass" and reason == "triplet found" and key in collector["postgrey"].get(recipient, {}): collector["postgrey"][recipient][key] = (collector["postgrey"][recipient][key][0], date) def scan_postfix_smtpd_line(date, log, collector): m = re.match("NOQUEUE: reject: RCPT from .*?: (.*?); from=<(.*?)> to=<(.*?)>", log) if m: message, sender, recipient = m.groups() if recipient in collector["real_mail_addresses"]: # only log mail to real recipients collector["rejected-mail"].setdefault(recipient, []).append( (date, sender, message) ) if __name__ == "__main__": from status_checks import ConsoleOutput env = utils.load_environment() scan_mail_log(ConsoleOutput(), env)