Andrew's git - logparse.git/blob - logparse/parsers/sshd.py

   1#
   2#   sshd.py
   3#   
   4#   Find number of ssh logins and authorised users (uses /var/log/auth.log)
   5#   
   6#   NOTE: This file is now deprecated in favour of the newer journald mechanism
   7#   used in sshd-journald.py. This parser is still functional but is slower and
   8#   has less features. Please switch over if possible.
   9#
  10
  11import re
  12
  13from logparse.formatting import *
  14from logparse.util import readlog, resolve
  15from logparse import config
  16from logparse.load_parsers import Parser
  17
  18class Sshd(Parser):
  19
  20    def __init__(self):
  21        super().__init__()
  22        self.name = "sshd"
  23        self.info = "Find number of ssh logins and authorised users (uses /var/log/auth.log)"
  24
  25    def parse_log(self):
  26
  27        logger.warning("NOTE: This sshd parser is now deprecated. Please use sshd-journald if possible.")
  28
  29        logger.debug("Starting sshd section")
  30        section = Section("ssh")
  31        logger.debug("Searching for matches in {0}".format(config.prefs.get("logs", "auth")))
  32        matches = re.findall('.*sshd.*Accepted publickey for .* from .*', readlog(config.prefs.get("logs", "auth")))    # get all logins
  33        logger.debug("Finished searching for logins")
  34
  35        logger.debug("Searching for matches in {0}".format(config.prefs.get("logs", "auth")))
  36        authlog = readlog(config.prefs.get("logs", "auth"))
  37       
  38        matches = re.findall('.*sshd.*Accepted publickey for .* from .*', authlog)    # get all logins
  39        invalid_matches = re.findall(".*sshd.*Invalid user .* from .*", authlog)
  40        root_matches = re.findall("Disconnected from authenticating user root", authlog)
  41        logger.debug("Finished searching for logins")
  42        
  43        users = []  # list of users with format [username, number of logins] for each item
  44        data = []
  45        num = len(matches)     # total number of logins
  46        for match in matches:
  47            entry = re.search('^.*publickey\sfor\s(\w*)\sfrom\s(\S*)', match)  # [('user', 'ip')]
  48
  49            user = entry.group(1)
  50            ip = entry.group(2)
  51
  52            userhost = user + '@' + resolve(ip, fqdn=config.prefs.get("sshd", "sshd-resolve-domains"))
  53            users.append(userhost)
  54        logger.debug("Parsed list of authorised users")
  55
  56        auth_data = Data(subtitle=plural('login', num) + ' from', items=users)
  57
  58        if (len(auth_data.items) == 1):             # if only one user, do not display no of logins for this user
  59            logger.debug("found " + str(len(matches)) + " ssh logins for user " + users[0])
  60            auth_data.subtitle += ' ' + auth_data.items[0]
  61        auth_data.orderbyfreq()
  62        auth_data.truncl(config.prefs.getint("logparse", "maxlist"))
  63        logger.debug("Found " + str(len(matches)) + " ssh logins for users " + str(data))
  64        section.append_data(auth_data)
  65
  66        invalid_users = []
  67        for match in invalid_matches:
  68            entry = re.search('^.*Invalid user (\S+) from (\S+).*', match)  # [('user', 'ip')]
  69
  70            try:
  71                user = entry.group(1)
  72                ip = entry.group(2)
  73            except:     # blank user field
  74                continue
  75
  76            userhost = user + '@' + ip
  77            invalid_users.append(userhost)
  78        logger.debug("Parsed list of invalid users")
  79        invalid_data = Data(subtitle=plural("attempted login", len(invalid_matches)) + " from " + plural("invalid user", len(invalid_users), print_quantity=False), items=invalid_users)
  80        if (len(invalid_data.items) == 1):             # if only one user, do not display no of logins for this user
  81            logger.debug("Found " + str(len(invalid_matches)) + " SSH login attempts for invalid user " + invalid_users[0])
  82            invalid_data.subtitle += ' ' + invalid_data.items[0]
  83        invalid_data.orderbyfreq()
  84        invalid_data.truncl(config.prefs.get("logparse", "maxlist"))
  85        logger.debug("Found " + str(len(invalid_matches)) + " SSH login attempts for invalid users " + str(data))
  86        section.append_data(invalid_data)
  87
  88        logger.debug("Found {0} attempted logins for root".format(str(len(root_matches))))
  89
  90        section.append_data(Data(subtitle=plural("attempted login", str(len(root_matches))) + " for root"))
  91
  92        logger.info("Finished sshd section")
  93        return section