mirror of
https://github.com/CISOfy/lynis.git
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536 lines
29 KiB
Bash
536 lines
29 KiB
Bash
#!/bin/sh
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#########################################################################
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#
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# * DO NOT REMOVE *
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#-----------------------------------------------------
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# PLUGIN_AUTHOR=Michael Boelen <michael.boelen@cisofy.com>
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# PLUGIN_CATEGORY=authentication
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# PLUGIN_DATE=2020-03-21
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# PLUGIN_DESC=PAM
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# PLUGIN_NAME=pam
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# PLUGIN_PACKAGE=all
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# PLUGIN_REQUIRED_TESTS=
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# PLUGIN_VERSION=1.0.5
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#-----------------------------------------------------
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#########################################################################
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#
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# Variables
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CREDITS_D_PASSWORD=""
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CREDITS_L_PASSWORD=""
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CREDITS_O_PASSWORD=""
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CREDITS_U_PASSWORD=""
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MAX_PASSWORD_RETRY=""
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MIN_PASSWORD_CLASS=""
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PAM_DIRECTORY="${ROOTDIR}etc/pam.d"
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#
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#########################################################################
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#
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# Test : PLGN-0008
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# Description : Check PAM configuration
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FILE="${ROOTDIR}etc/security/pwquality.conf"
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if [ -f ${FILE} ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no PLGN-0008 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check PAM configuration (pwquality.conf)" --progress
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if [ ${SKIPTEST} -eq 0 ]; then
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for LINE in $(${GREPBINARY} -v "^#" ${FILE} | ${TRBINARY} -d " "); do
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for I in ${LINE}; do
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OPTION=$(echo ${I} | ${AWKBINARY} -F= '{ print $1 }')
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VALUE=$(echo ${I} | ${AWKBINARY} -F= '{ print $2 }')
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case ${OPTION} in
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minlen)
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DigitsOnly ${VALUE}
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MIN_PASSWORD_LENGTH=${VALUE}
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;;
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retry)
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DigitsOnly ${VALUE}
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MAX_PASSWORD_RETRY=${VALUE}
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;;
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minclass)
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MIN_PASSWORD_CLASS=${VALUE}
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;;
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dcredit)
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CREDITS_D_PASSWORD=${VALUE}
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;;
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lcredit)
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CREDITS_L_PASSWORD=${VALUE}
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;;
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ocredit)
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CREDITS_O_PASSWORD=${VALUE}
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;;
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ucredit)
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CREDITS_U_PASSWORD=${VALUE}
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;;
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esac
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done
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done
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fi
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#
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#########################################################################
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#
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# Test : PLGN-0010
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# Description : Check PAM configuration
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if [ -f ${ROOTDIR}etc/pam.conf -o -d ${PAM_DIRECTORY} ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no PLGN-0010 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check PAM configuration" --progress
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if [ ${SKIPTEST} -eq 0 ]; then
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FOUNDPROBLEM=0
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# Check if the PAM directory structure exists
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if [ -d ${PAM_DIRECTORY} ]; then
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LogText "Result: ${PAM_DIRECTORY} exists"
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if [ ! "${OS}" = "FreeBSD" -a ! "${OS}" = "NetBSD" ]; then
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FIND_FILES=$(find ${PAM_DIRECTORY} \! -name "*.pam-old" -type f -print)
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else
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if [ -f ${PAM_DIRECTORY}/README ]; then
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LogText "Skipped checking ${OS} ${PAM_DIRECTORY}/README as a PAM file"
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fi
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FIND_FILES=$(find ${PAM_DIRECTORY} \! -name "README" \! -name "*.pam-old" -type f -print)
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fi
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for PAM_FILE in ${FIND_FILES}; do
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LogText "Now checking PAM file ${PAM_FILE}"
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while read line; do
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# Strip empty lines, commented lines, tabs, line breaks (\), then finally remove all double spaces
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LINE=$(echo $line | grep -v "^#" | grep -v "^$" | tr '\011' ' ' | sed 's/\\\n/ /' | sed 's/ / /g' | sed 's/ #\(.*\)$//')
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if [ ! "${LINE}" = "" ]; then
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PAM_SERVICE=$(echo ${PAM_FILE} | awk -F/ '{ print $NF }')
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PAM_CONTROL_FLAG="-"
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PAM_CONTROL_OPTIONS="-"
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PAM_MODULE="-"
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PAM_MODULE_OPTIONS="-"
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PAM_TYPE=$(echo ${LINE} | awk '{ print $1 }' | sed 's/^ *-//g')
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PARSELINE=0
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case ${PAM_TYPE} in
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"@include")
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FILE=$(echo ${LINE} | awk '{ print $2 }')
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Debug "Result: Found @include in ${PAM_FILE}. Does include PAM settings from file ${FILE} (which is individually processed)"
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;;
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"account")
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PARSELINE=1
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;;
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"auth")
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PARSELINE=1
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;;
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"password")
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PARSELINE=1
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;;
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"session")
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PARSELINE=1
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;;
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*)
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LogText "Exception: Unknown PAM type found (${PAM_TYPE})"
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;;
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esac
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if [ ${PARSELINE} -eq 1 ]; then
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MULTIPLE_OPTIONS=$(echo ${LINE} | awk '$2 ~ /^\[/')
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if [ ! "${MULTIPLE_OPTIONS}" = "" ]; then
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# Needs more parsing, depending on the options found
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PAM_CONTROL_OPTIONS=$(echo ${LINE} | sed "s/^.*\[//" | sed "s/\].*$//")
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LogText "Result: Found brackets in line, indicating multiple options for control flags: ${PAM_CONTROL_OPTIONS}"
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LINE=$(echo ${LINE} | sed "s/ \[.*\] / other /")
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fi
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PAM_MODULE=$(echo ${LINE} | awk '{ print $3 }')
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PAM_MODULE_OPTIONS=$(echo ${LINE} | cut -d ' ' -f 4-)
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PAM_CONTROL_FLAG=$(echo ${LINE} | awk '{ print $2 }')
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if [ ${PAM_CONTROL_FLAG} = "include" ]; then
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FILE=$(echo ${LINE} | awk '{ print $3 }')
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Debug "Result: Found include in ${PAM_FILE}. Does include PAM settings from file ${FILE} (which is individually processed)"
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PARSELINE=0
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fi
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fi
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if [ ${PARSELINE} -eq 1 ]; then
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case ${PAM_CONTROL_FLAG} in
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"optional"|"required"|"requisite"|"sufficient")
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#Debug "Found a common control flag: ${PAM_CONTROL_FLAG} for ${PAM_MODULE}"
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X=0 # do nothing
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;;
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"other")
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LogText "Result: brackets used, ignoring control flags"
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;;
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*)
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LogText "Unknown control flag found (${PAM_CONTROL_FLAG})"
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;;
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esac
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if [ ! "${PAM_MODULE_OPTIONS}" = "" ]; then
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LogText "Result: using module ${PAM_MODULE} (${PAM_CONTROL_FLAG}) with options ${PAM_MODULE_OPTIONS}"
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else
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PAM_MODULE_OPTIONS="-"
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LogText "Result: using module ${PAM_MODULE} (${PAM_CONTROL_FLAG}) without options configured"
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fi
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PAM_MODULE_NAME=$(echo ${PAM_MODULE} | sed 's/.so$//')
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#
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# Specific PAMs are commonly seen on these platforms:
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#
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# FreeBSD Linux macOS NetBSD
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# pam_access v
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# pam_afpmount v
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# pam_afslog v
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# pam_deny v v v v
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# pam_env v
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# pam_chroot v v
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# pam_echo v ? v
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# pam_exec v ? v
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# pam_ftpusers v
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# pam_group v v v
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# pam_guest v
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# pam_krb5 v v v
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# pam_ksu v v
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# pam_lastlog v v
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# pam_launchd v
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# pam_login_access v v
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# pam_mount v
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# pam_nologin v v v
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# pam_ntlm v
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# pam_opendirectory v
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# pam_opie v
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# pam_opieaccess v
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# pam_passwdqc v
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# pam_permit v v v
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# pam_radius v v
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# pam_rhosts v v
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# pam_rootok v v v
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# pam_sacl v
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# pam_securetty v v v
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# pam_securityserver v
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# pam_self v v
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# pam_skey v
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# pam_ssh v v
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# pam_tacplus v
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# pam_unix v v v
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# pam_uwtmp v
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# pam_wheel v
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# pam_winbind v
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case ${PAM_MODULE_NAME} in
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pam_access) ;;
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pam_afpmount | pam_afslog) ;;
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pam_cap) ;;
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pam_debug | pam_deny) ;;
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pam_echo| pam_env | pam_exec | pam_faildelay) ;;
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pam_filter | pam_ftp | pam_ftpusers) ;;
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# Google Authenticator / YubiKey
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# Common to find it only enabled for SSH
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pam_google_authenticator | pam_yubico)
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LogText "Result: found pam_google_authenticator"
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if [ "${PAM_CONTROL_FLAG}" = "required" ]; then
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PAM_2F_AUTH_ENABLED=1
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PAM_2F_AUTH_REQUIRED=1
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Report "authentication_2f_provider[]=${PAM_MODULE_NAME}"
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Report "authentication_2f_service[]=${PAM_SERVICE}"
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elif [ "${PAM_CONTROL_FLAG}" = "sufficient" ]; then
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PAM_2F_AUTH_ENABLED=1
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Report "authentication_2f_provider[]=${PAM_MODULE_NAME}"
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Report "authentication_2f_service[]=${PAM_SERVICE}"
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else
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LogText "exception: found 2F authenticator enabled with uncommon control flag: ${PAM_CONTROL_FLAG}"
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fi
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;;
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pam_group) ;;
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pam_guest) ;;
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pam_issue) ;;
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pam_keyinit | pam_krb5 | pam_ksu) ;;
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pam_launchd) ;;
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pam_lastlog | pam_limits) ;;
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pam_login_access) ;;
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# Log UID for auditd
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pam_loginuid)
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PAM_LOGINUID_FOUND=1
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;;
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pam_listfile | pam_localuser) ;;
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pam_mail | pam_mkhomedir | pam_motd) ;;
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pam_namespace | pam_nologin | pam_ntlm) ;;
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pam_opendirectory) ;;
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pam_permit) ;;
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# Password history - Can be configured via pam_unix or pam_pwhistory
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pam_pwhistory)
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LogText "Result: found ${PAM_MODULE} module (password history)"
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# set default for having pam_pwhistory enabled
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PAM_PASSWORD_PWHISTORY_ENABLED=1
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if [ "${PAM_PASSWORD_PWHISTORY_AMOUNT}" = "" ]; then PAM_PASSWORD_PWHISTORY_AMOUNT=10; fi
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if [ ! "${PAM_MODULE_OPTIONS}" = "" ]; then
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for I in ${PAM_MODULE_OPTIONS}; do
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OPTION=$(echo ${I} | awk -F= '{ print $1 }')
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VALUE=$(echo ${I} | awk -F= '{ print $2 }')
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CREDITS_CONFIGURED=0
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case ${OPTION} in
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remember)
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LogText "Result: password history (remember) configured for pam_pwhistory"
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DigitsOnly ${VALUE}
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PAM_PASSWORD_PWHISTORY_AMOUNT=${VALUE}
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Debug "Found password history enabled with module ${PAM_MODULE_NAME} and password amount ${PAM_PASSWORD_PWHISTORY_AMOUNT}"
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;;
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esac
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done
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fi
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;;
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pam_radius) ;;
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pam_rhosts) ;;
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pam_rootok) ;;
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pam_sacl) ;;
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pam_securetty) ;;
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pam_securityserver) ;;
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pam_self) ;;
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pam_selinux) ;;
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pam_shells) ;;
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pam_skey) ;;
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pam_ssh)
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LogText "Result: found ${PAM_MODULE} module (SSH authentication/session management)"
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ReportWarning ${TEST_NO} "Potential security risks using of pam_ssh(8) module."
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;;
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pam_stress | pam_succeed_if | pam_systemd) ;;
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pam_time | pam_timestamp) ;;
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pam_umask) ;;
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# Password history - Can be configured via pam_unix or pam_pwhistory
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pam_unix)
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LogText "Result: found ${PAM_MODULE} module (generic)"
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if [ ! "${PAM_MODULE_OPTIONS}" = "" ]; then
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for I in ${PAM_MODULE_OPTIONS}; do
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OPTION=$(echo ${I} | awk -F= '{ print $1 }')
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VALUE=$(echo ${I} | awk -F= '{ print $2 }')
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CREDITS_CONFIGURED=0
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case ${OPTION} in
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remember)
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LogText "Result: password history configured for pam_unix"
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DigitsOnly ${VALUE}
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PAM_PASSWORD_UXHISTORY_AMOUNT=${VALUE}
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PAM_PASSWORD_UXHISTORY_ENABLED=1
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Debug "Found password history enabled with module ${PAM_MODULE_NAME} and password amount ${PAM_PASSWORD_UXHISTORY_AMOUNT}"
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;;
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esac
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done
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fi
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;;
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pam_unix_acct| pam_unix_auth | pam_unix_passwd | pam_unix_session | pam_unix2) ;;
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pam_uwtmp) ;;
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pam_vbox) ;;
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pam_warn | pam_wheel) ;;
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pam_winbind) ;;
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pam_xauth) ;;
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# Password strength testing
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pam_cracklib | pam_pwquality)
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LogText "Result: found module ${PAM_MODULE} for password strength testing"
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# Set default values
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if [ "${CREDITS_D_PASSWORD}" = "" ]; then CREDITS_D_PASSWORD=1; fi
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if [ "${CREDITS_L_PASSWORD}" = "" ]; then CREDITS_L_PASSWORD=1; fi
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if [ "${CREDITS_O_PASSWORD}" = "" ]; then CREDITS_O_PASSWORD=1; fi
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if [ "${CREDITS_U_PASSWORD}" = "" ]; then CREDITS_U_PASSWORD=1; fi
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if [ "${MIN_PASSWORD_CLASS}" = "" ]; then MIN_PASSWORD_CLASS=0; fi
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if [ "${MIN_PASSWORD_LENGTH}" = "" ]; then MIN_PASSWORD_LENGTH=6; fi
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PAM_PASSWORD_STRENGTH_TESTED=1
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if [ ! "${PAM_MODULE_OPTIONS}" = "" ]; then
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Debug "Module options configured"
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for I in ${PAM_MODULE_OPTIONS}; do
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OPTION=$(echo ${I} | awk -F= '{ print $1 }')
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Debug ${OPTION}
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VALUE=$(echo ${I} | awk -F= '{ print $2 }')
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CREDITS_CONFIGURED=0
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case ${OPTION} in
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minlen)
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# Minimum length (remove 1 if credits are configured, at later stage in function)
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LogText "Result: minlen configured"
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DigitsOnly ${VALUE}
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MIN_PASSWORD_LENGTH=${VALUE}
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;;
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retry)
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# Maximum password retry
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LogText "Result: Max password Retry configured"
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DigitsOnly ${VALUE}
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MAX_PASSWORD_RETRY=${VALUE}
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;;
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minclass)
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# Minimum number of class required out of upper, lower, digit and others
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LogText "Result: Min number of password class is configured"
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MIN_PASSWORD_CLASS=${VALUE}
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;;
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dcredit)
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CREDITS_D_PASSWORD=${VALUE}
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;;
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lcredit)
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CREDITS_L_PASSWORD=${VALUE}
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;;
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ocredit)
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CREDITS_O_PASSWORD=${VALUE}
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;;
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ucredit)
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CREDITS_U_PASSWORD=${VALUE}
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;;
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*)
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LogText "Result: unknown option found: ${OPTION} with value ${VALUE}"
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;;
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esac
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done
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fi
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;;
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pam_tally | pam_tally2)
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if [ "${PAM_CONTROL_FLAG}" = "required" ]; then
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LogText "Result: found a required module for countering brute force cracking attempts"
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Report "pam_auth_brute_force_protection_module[]=${PAM_MODULE_NAME}"
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PAM_AUTH_BRUTE_FORCE_PROTECTION=1
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fi
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if [ ! "${PAM_MODULE_OPTIONS}" = "" ]; then
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for I in ${PAM_MODULE_OPTIONS}; do
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OPTION=$(echo ${I} | awk -F= '{ print $1 }')
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VALUE=$(echo ${I} | awk -F= '{ print $2 }')
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case ${OPTION} in
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deny)
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AUTH_BLOCK_BAD_LOGIN_ATTEMPTS="${VALUE}"
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;;
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unlock_time)
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AUTH_UNLOCK_TIME="${VALUE}"
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;;
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esac
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done
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fi
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;;
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"-")
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LogText "NOTE: this module is not parsed, as it uses an unknown control flag or type"
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;;
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*)
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LogText "Result: found pluggable authentication module ${PAM_MODULE}, which is unknown"
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;;
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esac
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fi
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#Debug "Service: ${PAM_SERVICE}"
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#Debug "Type: ${PAM_TYPE}"
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#Debug "Control: ${PAM_CONTROL_FLAG}"
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#Debug "Control options: ${PAM_CONTROL_OPTIONS}"
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#Debug "Module: ${PAM_MODULE_NAME}"
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#Debug "Module options: ${PAM_MODULE_OPTIONS}"
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fi
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done < ${PAM_FILE}
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#ParsePAMLine ${J}
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#StoreSetting "pam" "
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done
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fi
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fi
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#
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#################################################################################
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#
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# /etc/security/opasswd should exist when:
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# password history is enabled via pam_unix
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# pam_cracklib or pam_pwquality is used
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# In that case, the file should be owned by root, with 440/640/660 permissions
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LogText "[PAM] PAM 2F authentication enabled: ${PAM_2F_AUTH_ENABLED}"
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Report "authentication_two_factor_enabled=${PAM_2F_AUTH_ENABLED}"
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LogText "[PAM] PAM 2F authentication required: ${PAM_2F_AUTH_REQUIRED}"
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Report "authentication_two_factor_required=${PAM_2F_AUTH_REQUIRED}"
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if [ ! "${AUTH_UNLOCK_TIME}" = "-1" ]; then
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LogText "[PAM] Authentication unlock time: ${AUTH_UNLOCK_TIME}"
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Report "authentication_unlock_time=${AUTH_UNLOCK_TIME}"
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else
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LogText "[PAM] Authentication unlock time: not configured"
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fi
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LogText "[PAM] Password brute force protection: ${PAM_AUTH_BRUTE_FORCE_PROTECTION}"
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if [ ${PAM_AUTH_BRUTE_FORCE_PROTECTION} -eq 1 ]; then
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Report "authentication_brute_force_protection=1"
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fi
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if [ ! "${MIN_PASSWORD_LENGTH}" = "-1" ]; then
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LogText "[PAM] Minimum password length: ${MIN_PASSWORD_LENGTH}"
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Report "minimum_password_length=${MIN_PASSWORD_LENGTH}"
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else
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LogText "[PAM] Minimum password length: not configured"
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fi
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LogText "[PAM] Password strength testing enabled: ${PAM_PASSWORD_STRENGTH_TESTED}"
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if [ ${PAM_PASSWORD_STRENGTH_TESTED} -eq 1 ]; then
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Report "password_strength_tested=1"
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if [ ${CREDITS_D_PASSWORD} -ge 1 -a ${CREDITS_L_PASSWORD} -ge 1 -a ${CREDITS_O_PASSWORD} -ge 1 -a ${CREDITS_U_PASSWORD} -ge 1 ]; then
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# Show how many password class are required out of 4
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LogText "[PAM] Minimum password class out of 4: ${MIN_PASSWORD_CLASS}"
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Report "min_password_class=${MIN_PASSWORD_CLASS}"
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else
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LogText "[PAM] Minimum password class setting of ${MIN_PASSWORD_CLASS} out of 4 is ignored since at least 1 class are forced"
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Report "min_password_class=ignored"
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fi
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# Digits
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if [ ${CREDITS_D_PASSWORD} -lt 0 ]; then
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|
CREDITS_D_PASSWORD=$(echo ${CREDITS_D_PASSWORD} | cut -b 2-)
|
|
LogText "[PAM] Minimum number of Digital characters required: ${CREDITS_D_PASSWORD}"
|
|
Report "password_min_digital_required=${CREDITS_D_PASSWORD}"
|
|
elif [ ${CREDITS_D_PASSWORD} -ge 0 ]; then
|
|
LogText "[PAM] Maximum credit for Digital characters: ${CREDITS_D_PASSWORD}"
|
|
Report "password_max_digital_credit=${CREDITS_D_PASSWORD}"
|
|
fi
|
|
|
|
# Lowercase
|
|
if [ ${CREDITS_L_PASSWORD} -lt 0 ]; then
|
|
CREDITS_L_PASSWORD=$(echo ${CREDITS_L_PASSWORD} | cut -b 2-)
|
|
LogText "[PAM] Minimum number of Lowercase characters required: ${CREDITS_L_PASSWORD}"
|
|
Report "password_min_l_required=${CREDITS_L_PASSWORD}"
|
|
elif [ ${CREDITS_L_PASSWORD} -ge 0 ]; then
|
|
LogText "[PAM] Maximum credit for Lowercase characters: ${CREDITS_L_PASSWORD}"
|
|
Report "password_max_l_credit=${CREDITS_L_PASSWORD}"
|
|
fi
|
|
|
|
# Other characters
|
|
if [ ${CREDITS_O_PASSWORD} -lt 0 ]; then
|
|
CREDITS_O_PASSWORD=$(echo ${CREDITS_O_PASSWORD} | cut -b 2-)
|
|
LogText "[PAM] Minimum number of Other characters required: ${CREDITS_O_PASSWORD}"
|
|
Report "password_min_other_required=${CREDITS_O_PASSWORD}"
|
|
elif [ ${CREDITS_O_PASSWORD} -ge 0 ]; then
|
|
LogText "[PAM] Maximum credit for Other characters: ${CREDITS_O_PASSWORD}"
|
|
Report "password_max_other_credit=${CREDITS_O_PASSWORD}"
|
|
fi
|
|
|
|
# Uppercase
|
|
if [ ${CREDITS_U_PASSWORD} -lt 0 ]; then
|
|
CREDITS_U_PASSWORD=$(echo ${CREDITS_U_PASSWORD} | cut -b 2-)
|
|
LogText "[PAM] Minimum number of Uppercase characters required: ${CREDITS_U_PASSWORD}"
|
|
Report "password_min_u_required=${CREDITS_U_PASSWORD}"
|
|
elif [ ${CREDITS_U_PASSWORD} -ge 0 ]; then
|
|
LogText "[PAM] Maximum credit for Uppercase characters: ${CREDITS_U_PASSWORD}"
|
|
Report "password_max_u_credit=${CREDITS_U_PASSWORD}"
|
|
fi
|
|
fi
|
|
|
|
# Show how many retries are allowed to change password
|
|
if [ ! -z "${MAX_PASSWORD_RETRY}" ]; then
|
|
LogText "[PAM] Password maximum retry: ${MAX_PASSWORD_RETRY}"
|
|
Report "max_password_retry=${MAX_PASSWORD_RETRY}"
|
|
else
|
|
LogText "[PAM] Password maximum retry: Not configured"
|
|
fi
|
|
|
|
# If auditd is running, but pam_loginuid not, events might not be properly logged
|
|
if [ ${AUDITD_RUNNING} -eq 1 ]; then
|
|
if [ ${PAM_LOGINUID_FOUND} -eq 0 ]; then
|
|
Report "pam_issue[]=pam_loginuid is missing"
|
|
fi
|
|
fi
|
|
|
|
if [ ${PAM_PASSWORD_PWHISTORY_ENABLED} -eq 1 ]; then
|
|
LogText "[PAM] Password history with pam_pwhistory enabled: ${PAM_PASSWORD_PWHISTORY_ENABLED}"
|
|
LogText "[PAM] Password history with pam_pwhistory amount: ${PAM_PASSWORD_PWHISTORY_AMOUNT}"
|
|
Report "password_history_amount=${PAM_PASSWORD_PWHISTORY_AMOUNT}"
|
|
else
|
|
LogText "[PAM] Password history with pam_pwhistory IS NOT enabled"
|
|
fi
|
|
|
|
if [ ${PAM_PASSWORD_UXHISTORY_ENABLED} -eq 1 ]; then
|
|
LogText "[PAM] Password history with pam_unix enabled: ${PAM_PASSWORD_UXHISTORY_ENABLED}"
|
|
LogText "[PAM] Password history with pam_unix amount: ${PAM_PASSWORD_UXHISTORY_AMOUNT}"
|
|
Report "password_history_amount=${PAM_PASSWORD_UXHISTORY_AMOUNT}"
|
|
else
|
|
LogText "[PAM] Password history with pam_unix IS NOT enabled"
|
|
fi
|
|
|
|
|
|
|
|
#EOF
|