lynis/include/tests_logging

#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2013-2016, CISOfy
#
# Website  : https://cisofy.com
# Blog     : http://linux-audit.com
# GitHub   : https://github.com/CISOfy/lynis
#
# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
# welcome to redistribute it under the terms of the GNU General Public License.
# See LICENSE file for usage of this software.
#
#################################################################################
#
# Logging and related files
#
#################################################################################
#
    LOG_FILES_LOCS="/var/log /var/adm"
    LOGROTATE_CONFIG_FOUND=0
    LOGROTATE_TOOL=""
    METALOG_RUNNING=0
    RFC3195D_RUNNING=0
    RSYSLOG_RUNNING=0
    SOLARIS_LOGHOST_FOUND=0
    SYSLOG_DAEMON_PRESENT=0
    SYSLOG_DAEMON_RUNNING=0
    SYSLOG_NG_RUNNING=0
    SYSTEMD_JOURNAL_RUNNING=0
#
#################################################################################
#
    InsertSection "Logging and files"

    # Test        : LOGG-2130
    # Description : Check for a running syslog daemon
    Register --test-no LOGG-2130 --weight L --network NO --description "Check for running syslog daemon"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching for a logging daemon"
        FIND=`${PSBINARY} ax | egrep "syslogd|syslog-ng|metalog|systemd-journal" | grep -v "grep"`
        if [ "${FIND}" = "" ]; then
            Display --indent 2 --text "- Checking for a running log daemon" --result WARNING --color RED
            LogText "Result: Could not find a syslog daemon like syslog, syslog-ng, rsyslog, metalog, systemd-journal"
            ReportSuggestion ${TEST_NO} "Check if any syslog daemon is running and correctly configured."
            ReportWarning ${TEST_NO} "H" "No syslog daemon found"
            AddHP 0 3
          else
            Display --indent 2 --text "- Checking for a running log daemon" --result OK --color GREEN
            LogText "Result: Found a logging daemon"
            SYSLOG_DAEMON_PRESENT=1
            SYSLOG_DAEMON_RUNNING=1
            AddHP 3 3
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2132
    # Description : Check for a running syslog-ng daemon
    Register --test-no LOGG-2132 --weight L --network NO --description "Check for running syslog-ng daemon"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching for syslog-ng daemon in process list"
        IsRunning syslog-ng
        if [ ${RUNNING} -eq 1 ]; then
            LogText "Result: Found syslog-ng in process list"
            Display --indent 4 --text "- Checking Syslog-NG status" --result FOUND --color GREEN
            SYSLOG_DAEMON_PRESENT=1
            SYSLOG_NG_RUNNING=1
          else
            LogText "Result: Syslog-ng NOT found in process list"
            Display --indent 4 --text "- Checking Syslog-NG status" --result "NOT FOUND" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2134
    # Description : Check for Syslog-NG configuration file consistency
    if [ ! "${SYSLOGNGBINARY}" = "" -a ${SYSLOG_NG_RUNNING} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no LOGG-2134 --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking Syslog-NG configuration file consistency"
    if [ ${SKIPTEST} -eq 0 ]; then
        FIND=`${SYSLOGNGBINARY} -s; echo $?`
        if [ "${FIND}" = "0" ]; then
            LogText "Result: Syslog-NG configuration file seems to be consistent"
            Display --indent 6 --text "- Checking Syslog-NG consistency" --result OK --color GREEN
          else
            LogText "Result: Syslog-NG configuration file seems NOT to be consistent"
            Display --indent 6 --text "- Checking Syslog-NG consistency" --result WARNING --color RED
            ReportWarning ${TEST_NO} "L" "Found one or more problems in Syslog-NG configuration file"
            ReportSuggestion ${TEST_NO} "Check the Syslog-NG configuration file and/or run a manual consistency check with: syslog-ng -s"
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2136
    # Description : Check for a running systemd-journal daemon
    Register --test-no LOGG-2136 --weight L --network NO --description "Check for running systemd journal daemon"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching for systemd journal daemon in process list"
        IsRunning systemd-journal
        if [ ${RUNNING} -eq 1 ]; then
            Display --indent 4 --text "- Checking systemd journal status" --result FOUND --color GREEN
            SYSTEMD_JOURNAL_RUNNING=1
          else
            Display --indent 4 --text "- Checking systemd journal status" --result "NOT FOUND" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2210
    # Description : Check for a running metalog daemon
    Register --test-no LOGG-2210 --weight L --network NO --description "Check for running metalog daemon"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching for metalog daemon in process list"
        IsRunning metalog
        if [ ${RUNNING} -eq 1 ]; then
            LogText "Result: Found metalog in process list"
            Display --indent 4 --text "- Checking Metalog status" --result FOUND --color GREEN
            SYSLOG_DAEMON_PRESENT=1
            METALOG_RUNNING=1
          else
            LogText "Result: metalog NOT found in process list"
            Display --indent 4 --text "- Checking Metalog status" --result "NOT FOUND" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2230
    # Description : Check for a running rsyslog daemon
    Register --test-no LOGG-2230 --weight L --network NO --description "Check for running RSyslog daemon"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching for RSyslog daemon in process list"
        IsRunning rsyslogd
        if [ ${RUNNING} -eq 1 ]; then
            LogText "Result: Found rsyslogd in process list"
            Display --indent 4 --text "- Checking RSyslog status" --result FOUND --color GREEN
            SYSLOG_DAEMON_PRESENT=1
            RSYSLOG_RUNNING=1
          else
            LogText "Result: rsyslogd NOT found in process list"
            Display --indent 4 --text "- Checking RSyslog status" --result "NOT FOUND" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2240
    # Description : Check for a running RFC 3195 compliant daemon (syslog via TCP)
    Register --test-no LOGG-2240 --weight L --network NO --description "Check for running RFC 3195 compliant daemon"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching for RFC 3195 daemon (alias syslog reliable) in process list"
        IsRunning rfc3195d
        if [ ${RUNNING} -eq 1 ]; then
            LogText "Result: Found rfc3195d in process list"
            Display --indent 4 --text "- Checking RFC 3195 daemon status" --result FOUND --color GREEN
            SYSLOG_DAEMON_PRESENT=1
            RFC3195D_RUNNING=1
          else
            LogText "Result: rfc3195d NOT found in process list"
            Display --indent 4 --text "- Checking RFC 3195 daemon status" --result "NOT FOUND" --color WHITE
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2138
    # Description : Check for kernel log daemon (klogd) presence on Linux systems
    # Notes       : * When using rsyslog or systemd (systemd-journal), this process is not needed.
    #               * In combination with syslog-ng, klogd is still an addition to it, since it
    #                 captures kernel related events and send them to syslog-ng.
    #               * This test should be below all other logging daemons
    Register --test-no LOGG-2138 --os Linux --weight L --network NO --description "Checking kernel logger daemon on Linux"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching kernel logger daemon (klogd)"
        if [ ${RSYSLOG_RUNNING} -eq 0 -a ${SYSTEMD_JOURNAL_RUNNING} -eq 0 ]; then
            # Search for klogd, but ignore other lines related to klogd (like dd with input/output file)
            #FIND=`${PSBINARY} ax | grep "klogd" | grep -v "dd" | grep -v "grep"`
            IsRunning klogd
            if [ ${RUNNING} -eq 1 ]; then
                LogText "Result: klogd running"
                Display --indent 4 --text "- Checking klogd" --result FOUND --color GREEN
              else
                LogText "Result: No klogd found"
                Display --indent 4 --text "- Checking klogd" --result "NOT FOUND" --color RED
                ReportWarning ${TEST_NO} "L" "klogd is not running, which could lead to missing kernel messages in log files"
            fi
          else
            LogText "Result: test skipped, because other facility is being used to log kernel messages"
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2142
    # Description : Check for minilogd presence on Linux systems
    Register --test-no LOGG-2142 --os Linux --weight L --network NO --description "Checking minilog daemon"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Result: Checking for unkilled minilogd instances"
        # Search for minilogd. It shouldn't be running normally, if another syslog daemon is started
        IsRunning minilogd
        if [ ${RUNNING} -eq 0 ]; then
            Display --indent 4 --text "- Checking minilogd instances" --result "NOT FOUND" --color WHITE
            LogText "Result: No minilogd is running"
          else
            Display --indent 4 --text "- Checking minilogd instances" --result WARNING --color RED
            LogText "Result: minilogd found in process list"
            # minilogd daemon seems to be running
            ReportWarning ${TEST_NO} "L" "minilogd is running, which should normally not be running"
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2146
    # Description : Check for logrotate (/etc/logrotate.conf and logrotate.d)
    Register --test-no LOGG-2146 --weight L --os Linux --network NO --description "Checking logrotate.conf and logrotate.d"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking for /etc/logrotate.conf"
        if [ -f /etc/logrotate.conf ]; then
            LOGROTATE_CONFIG_FOUND=1
            LOGROTATE_TOOL="logrotate"
            LogText "Result: /etc/logrotate.conf found (file)"
          else
            LogText "Result: /etc/logrotate.conf NOT found"
        fi
        LogText "Test: Checking for /etc/logrotate.d (directory)"
        if [ -d /etc/logrotate.d ]; then
            LOGROTATE_CONFIG_FOUND=1
            LOGROTATE_TOOL="logrotate"
            LogText "Result: /etc/logrotate.d found"
          else
            LogText "Result: /etc/logrotate.conf found"
        fi
        if [ ${LOGROTATE_CONFIG_FOUND} -eq 1 ]; then
            Display --indent 2 --text "- Checking logrotate presence" --result OK --color GREEN
            LogText "Result: logrotate configuration found"
          else
            Display --indent 2 --text "- Checking logrotate presence" --result WARNING --color RED
            LogText "Result: No logrotate configuration found"
            ReportSuggestion ${TEST_NO} "Check if files are properly rotated by a some tool instead of logrotate"
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2148
    # Description : Checking log files rotated with logrotate
    if [ ! "${LOGROTATEBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no LOGG-2148 --weight L --preqs-met ${PREQS_MET} --network NO --description "Checking logrotated files"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking which files are rotated with logrotate and if they exist"
        FIND=`${LOGROTATEBINARY} -d -v /etc/logrotate.conf 2>&1 | egrep "considering log|skipping" | grep -v '*' | sort -u | awk '{ if ($2!="log") { print "File:"$2":does_not_exist" } else { print "File:"$3":exists" } }'`
        if [ "${FIND}" = "" ]; then
            LogText "Result: nothing found"
          else
            LogText "Result: found one or more files which are rotated via logrotate"
            for I in ${FIND}; do
                LogText "Output: ${I}"
            done
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2150
    # Description : Checking log directories rotated with logrotate
    if [ ! "${LOGROTATEBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no LOGG-2150 --weight L --preqs-met ${PREQS_MET} --network NO --description "Checking directories in logrotate configuration"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Checking which directories can be found in logrotate configuration"
        FIND=`${LOGROTATEBINARY} -d -v /etc/logrotate.conf 2>&1 | egrep "considering log|skipping" | grep -v '*' | sort -u | awk '{ if ($2=="log") { print $3 } }' | sed 's@/[^/]*$@@g' | sort -u`
        if [ "${FIND}" = "" ]; then
            LogText "Result: nothing found"
          else
            LogText "Result: found one or more directories (via logrotate configuration)"
            for I in ${FIND}; do
                if [ -d ${I} ]; then
                    LogText "Directory found: ${I}"
                    Report "log_directory[]=${I}"
                  else
                    LogText "Directory could not be found: ${I}"
                fi
            done
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2152
    # Description : Check for Solaris 'loghost' entry in /etc/inet/hosts, or
    #               succesful resolving via DNS or any other name service.
    Register --test-no LOGG-2152 --weight L --os Solaris --network NO --description "Checking loghost"
    if [ ${SKIPTEST} -eq 0 ]; then
        # Try local hosts file
        LogText "Result: Checking for loghost in /etc/inet/hosts"
        FIND=`grep loghost /etc/inet/hosts | grep -v "^#"`
        if [ ! "${FIND}" = "" ]; then
            SOLARIS_LOGHOST_FOUND=1
            LogText "Result: Found loghost entry in /etc/inet/hosts"
          else
            LogText "Result: No loghost entry found in /etc/inet/hosts"

            # Try name resolving if no entry is present in local host file
            LogText "Result: Checking for loghost via name resolving"
            FIND=`getent hosts loghost | grep loghost`
            if [ ! "${FIND}" = "" ]; then
                SOLARIS_LOGHOST_FOUND=1
                LogText "Result: name resolving was succesful"
                LogText "Output: ${FIND}"
              else
                LogText "Result: name resolving didn't find results"
            fi
        fi

        if [ ${SOLARIS_LOGHOST_FOUND} -eq 1 ]; then
            LogText "Result: loghost entry found and most likely used to send syslog messages"
            Display --indent 2 --text "- Checking loghost entry" --result OK --color GREEN
          else
            Display --indent 2 --text "- Checking loghost entry" --result WARNING --color RED
            LogText "Result: No loghost entry found"
            ReportWarning ${TEST_NO} "L" "No loghost entry found"
            ReportSuggestion ${TEST_NO} "Add a loghost entry to /etc/inet/hosts or other name services"
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2154
    # Description : Check to see if remote logging is enabled
    # Notes       : prevent lines showing up with commands in it (like |mail)
    if [ ${SYSLOG_DAEMON_RUNNING} -eq 1 ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no LOGG-2154 --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking syslog configuration file"
    if [ ${SKIPTEST} -eq 0 ]; then
        if [ ${SYSLOG_NG_RUNNING} -eq 1 ]; then
            SYSLOGD_CONF="/etc/syslog-ng/syslog-ng.conf"
          else
            SYSLOGD_CONF="/etc/syslog.conf"
        fi
        if [ -f ${SYSLOGD_CONF} ]; then
            LogText "Test: check if logs are also logged to a remote logging host"
            FIND=`egrep "@[a-zA-Z0-9]|destination\s.+(udp|tcp).+\sport" ${SYSLOGD_CONF} | grep -v "^#" | grep -v "[a-zA-Z0-9]@"`
            if [ ! "${FIND}" = "" ]; then
                LogText "Result: remote logging enabled"
                REMOTE_LOGGING_ENABLED=1
            else
                # Search for configured destinations with an IP address or hostname, then determine which ones are used as a log destination
                DESTINATIONS=`grep "^destination" ${SYSLOGD_CONF} | egrep "(udp|tcp)" | grep "port" | awk '{print $2}'`
                for DESTINATION in ${DESTINATIONS}; do
                    FIND2=`grep "log" | grep "source" | egrep "destination\(${DESTINATION}\)"`
                    if [ ! "${FIND2}" = "" ]; then
                        LogText "Result: found destination ${DESTINATION} configured for remote logging"
                        REMOTE_LOGGING_ENABLED=1
                    fi
                done
            fi
            if [ ${REMOTE_LOGGING_ENABLED} -eq 0 ]; then
                LogText "Result: no remote logging found"
                ReportSuggestion ${TEST_NO} "Enable logging to an external logging host for archiving purposes and additional protection"
                AddHP 1 3
                Display --indent 2 --text "- Checking remote logging" --result "NOT ENABLED" --color YELLOW
              else
                AddHP 5 5
                Display --indent 2 --text "- Checking remote logging" --result ENABLED --color GREEN
            fi
          else
            LogText "Result: test skipped, file ${SYSLOGD_CONF} not found"
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2160
    # Description : Check for /etc/newsyslog.conf (FreeBSD/OpenBSD)
    if [ -f /etc/newsyslog.conf ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no LOGG-2160 --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking /etc/newsyslog.conf"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Result: /etc/newsyslog.conf found"
        Display --indent 2 --text "- Checking /etc/newsyslog.conf" --result FOUND --color GREEN
        LOGROTATE_CONFIG_FOUND=1
        LOGROTATE_TOOL="newsyslog"
    fi
#
#################################################################################
#
    # Test        : LOGG-2162
    # Description : Check for directories in /etc/newsyslog.conf
    if [ -f /etc/newsyslog.conf ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no LOGG-2162 --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking directories in /etc/newsyslog.conf"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: parsing directories from /etc/newsyslog.conf file"
        FIND=`awk '/^\// { print $1 }' /etc/newsyslog.conf | sed 's/\/*[a-zA-Z_.-]*$//g' | sort -u`
        for I in ${FIND}; do
            if [ -d ${I} ]; then
                LogText "Result: Directory ${I} found and exists"
                Report "log_directory[]=${I}"
              else
                LogText "Result: Item ${I} is not a directory"
            fi
        done
        Display --indent 4 --text "- Checking log directories (newsyslog.conf)" --result DONE --color GREEN
    fi
#
#################################################################################
#
    # Test        : LOGG-2164
    # Description : Check for files in /etc/newsyslog.conf
    if [ -f /etc/newsyslog.conf ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no LOGG-2164 --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking files specified /etc/newsyslog.conf"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: parsing files from /etc/newsyslog.conf file"
        FIND=`awk '/^\// { print $1 }' /etc/newsyslog.conf | sort -u`
        for I in ${FIND}; do
            if [ -f ${I} ]; then
                LogText "Result: File ${I} found and exists"
              else
                LogText "Result: Item ${I} is not a file"
            fi
        done
        Display --indent 4 --text "- Checking log files (newsyslog.conf)" --result DONE --color GREEN
    fi
#
#################################################################################
#
    # Test        : LOGG-2170
    # Description : Search available log paths
    Register --test-no LOGG-2170 --weight L --network NO --description "Checking log paths"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Searching log paths"
        for I in ${LOG_FILES_LOCS}; do
            if [ -d ${I} ]; then
                LogText "Result: directory ${I} exists"
                Report "log_directory[]=${I}"
              else
                LogText "Result: directory ${I} can't be found"
            fi
        done
        Display --indent 2 --text "- Checking log directories (static list)" --result DONE --color GREEN
    fi
#
#################################################################################
#
    # Test        : LOGG-2180
    # Description : Search open log file
    Register --test-no LOGG-2180 --weight L --network NO --description "Checking open log files"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: checking open log files with lsof"
        if [ ! "${LSOFBINARY}" = "" ]; then
            FIND=`${LSOFBINARY} -n 2>&1 | grep "log$" | egrep -v "WARNING|Output information" | awk '{ if ($5=="REG") { print $9 } }' | sort -u | grep -v "^$"`
            for I in ${FIND}; do
                LogText "Found logfile: ${I}"
                Report "open_logfile[]=${I}"
            done
            Display --indent 2 --text "- Checking open log files" --result DONE --color GREEN
          else
            LogText "Result: lsof not installed, skipping test"
            Display --indent 2 --text "- Checking open log files" --result SKIPPED --color YELLOW
            # Add suggestion
        fi
    fi
#
#################################################################################
#
    # Test        : LOGG-2190
    # Description : Checking deleted files
    if [ ! "${LSOFBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no LOGG-2190 --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking for deleted files in use"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: checking deleted files that are still in use"

        LSOF_GREP="WARNING|Output information"
        if [ ${GRSEC_FOUND} -eq 1 ]; then
            # grsecurity causes Fail2Ban to hold onto deleted in-use files in /var/tmp
            LSOF_GREP="${LSOF_GREP}|fail2ban"
        fi
        if [ ${OS_REDHAT_OR_CLONE} -eq 1 ]; then
            # If lynis is run from /etc/cron.daily some deleted in-use files are kept in /tmp
            LSOF_GREP="${LSOF_GREP}|anacron|awk|run-parts"
        fi

        FIND=`${LSOFBINARY} -n +L 1 2>&1 | egrep -vw "${LSOF_GREP}" | awk '{ if ($5=="REG") { printf "%s(%s)\n", $10, $1 } }' | grep -v "^$" | sort -u`
        if [ ! "${FIND}" = "" ]; then
            LogText "Result: found one or more files which are deleted, but still in use"
            for I in ${FIND}; do
                LogText "Found deleted file: ${I}"
                Report "deleted_file[]=${I}"
            done
            Display --indent 2 --text "- Checking deleted files in use" --result "FILES FOUND" --color YELLOW
            ReportSuggestion ${TEST_NO} "Check what deleted files are still in use and why."
          else
            LogText "Result: no deleted files found"
            Display --indent 2 --text "- Checking deleted files in use" --result DONE --color GREEN
        fi
    fi
#
#################################################################################
#

Report "log_rotation_config_found=${LOGROTATE_CONFIG_FOUND}"
Report "log_rotation_tool=${LOGROTATE_TOOL}"

WaitForKeyPress

#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com