diff --git a/db/languages/en b/db/languages/en index 52ace1f7..689cc57e 100644 --- a/db/languages/en +++ b/db/languages/en @@ -63,6 +63,7 @@ SECTION_USB_DEVICES="USB Devices" SECTION_USERS_GROUPS_AND_AUTHENTICATION="Users, Groups and Authentication" SECTION_VIRTUALIZATION="Virtualization" SECTION_WEBSERVER="Software: webserver" +SECTION_KERBEROS="Kerberos" STATUS_ACTIVE="ACTIVE" STATUS_CHECK_NEEDED="CHECK NEEDED" STATUS_DEBUG="DEBUG" diff --git a/default.prf b/default.prf index ec043417..0e90fa04 100644 --- a/default.prf +++ b/default.prf @@ -144,6 +144,7 @@ plugin=software plugin=system-integrity plugin=systemd plugin=users +plugin=krb5 # Disable a particular plugin (will overrule an enabled plugin) #disable-plugin=authentication diff --git a/include/binaries b/include/binaries index a2b4895a..46359b3c 100644 --- a/include/binaries +++ b/include/binaries @@ -196,6 +196,8 @@ iptables-save) IPTABLESSAVEBINARY="${BINARY}"; LogText " Found known binary: iptables-save (firewall) - ${BINARY}" ;; istat) ISTATBINARY="${BINARY}"; LogText " Found known binary: istat (file information) - ${BINARY}" ;; journalctl) JOURNALCTLBINARY="${BINARY}"; LogText " Found known binary: journalctl (systemd journal) - ${BINARY}" ;; + kadmin.local) KADMINLOCALBINARY="${BINARY}"; LogText " Found known binary: kadmin.local (krb5) - ${BINARY}" ;; + kdb5_util) KDB5UTILBINARY="${BINARY}"; LogText " Found known binary: kdb5_util (krb5) - ${BINARY}" ;; kldstat) KLDSTATBINARY="${BINARY}"; LogText " Found known binary: kldstat (kernel modules) - ${BINARY}" ;; kstat) KSTATBINARY="${BINARY}"; LogText " Found known binary: kstat (kernel statistics) - ${BINARY}" ;; launchctl) LAUNCHCTL_BINARY="${BINARY}"; SERVICE_MANAGER="launchd"; LogText " Found known binary: launchctl (launchd client) - ${BINARY}" ;; diff --git a/include/tests_kerberos b/include/tests_kerberos new file mode 100644 index 00000000..494a01b1 --- /dev/null +++ b/include/tests_kerberos @@ -0,0 +1,188 @@ +#!/bin/sh + +InsertSection "${SECTION_KERBEROS}" + +# +######################################################################### +# + + # Test : KRB-1000 + # Description : Check that Kerberos principals have passwords that expire + Register --test-no KRB-1000 --weight L --network NO --description "Check for Kerberos KDC tools" + if [ -n "${KADMINLOCALBINARY}" ] && [ -n "${KDB5UTILBINARY}" ] + then + PREQS_MET="YES" + # Make sure krb5 debugging doesn't mess up the output + unset KRB5_TRACE + PRINCS="$(${KADMINLOCALBINARY} listprincs | ${TRBINARY:-tr} '\n' ' ')" + if [ -z "${PRINCS}" ] + then + PREQS_MET="NO" + fi + else + PREQS_MET="NO" + fi + if [ "${PREQS_MET}" = "YES" ]; then + Display --indent 2 --text "- Check for Kerberos KDC and principals" --result "${STATUS_FOUND}" --color GREEN + else + Display --indent 2 --text "- Check for Kerberos KDC and principals" --result "${STATUS_NOT_FOUND}" --color WHITE + fi + + # Test : KRB-1010 + # Description : Check that Kerberos principals have passwords that expire + Register --test-no KRB-1010 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check that Kerberos principals have passwords that expire" + FOUND=0 + if [ ${SKIPTEST} -eq 0 ]; then + for I in ${PRINCS} + do + FIND="$(${KADMINLOCALBINARY} getprinc "${I}" | ${GREPBINARY} '^Password expiration date:')" + if [ "${FIND}" = "Password expiration date: [never]" ] + then + LogText "Result: Kerberos principal ${I} has a password/key that never expires" + FOUND=1 + fi + done + fi + if [ ${FOUND} -eq 1 ]; then + Display --indent 4 --text "- Principals without expiring password" --result "${STATUS_WARNING}" --color RED + ReportSuggestion "${TEST_NO}" "Make sure all your Kerberos principals have expiring passwords" + else + Display --indent 4 --text "- Principals without expiring password" --result "${STATUS_OK}" --color GREEN + fi +# +################################################################################# +# + + # Test : KRB-1020 + # Description : Check last password change for Kerberos principals + Register --test-no KRB-1020 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check last password change for Kerberos principals" + if [ ${SKIPTEST} -eq 0 ]; then + FOUND=0 + for I in ${PRINCS} + do + FIND="$(${KADMINLOCALBINARY} getprinc "${I}" | ${SEDBINARY} -n '/^Last password change:\s\+/s/^Last password change:\s\+//p')" + if [ "${FIND}" = "[never]" ] + then + LogText "Result: Kerberos principal ${I} has a password/key that has never been changed" + FOUND=1 + else + J="$(date -d "${FIND}" +%s)" + if [ ${J} -lt $((NOW - 60 * 60 * 24 * 365)) ] + then + LogText "Result: Kerberos principal ${I} has had a password/key change over a year ago" + FOUND=1 + fi + fi + done + if [ ${FOUND} -eq 1 ]; then + Display --indent 4 --text "- Principals with late password change" --result "${STATUS_WARNING}" --color RED + ReportSuggestion "${TEST_NO}" "Enforce frequent password/key change for your Kerberos principals" + else + Display --indent 4 --text "- Principals with late password change" --result "${STATUS_OK}" --color GREEN + fi + fi + +# +################################################################################# +# + + # Test : KRB-1030 + # Description : Check that Kerberos principals have a policy associated to them + Register --test-no KRB5-1030 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check that Kerberos principals have a policy associated to them" + if [ ${SKIPTEST} -eq 0 ]; then + FOUND=0 + for I in ${PRINCS} + do + FIND="$(${KADMINLOCALBINARY} getprinc "${I}" | ${GREPBINARY} '^Policy:')" + if [ "${FIND}" = "Policy: [none]" ] + then + LogText "Result: Kerberos principal ${I} does not have a policy associated to it" + FOUND=1 + fi + done + if [ ${FOUND} -eq 1 ]; then + Display --indent 4 --text "- Principals without associated policy" --result "${STATUS_WARNING}" --color RED + ReportSuggestion "${TEST_NO}" "Make sure all your Kerberos principals have a policy associated to them" + else + Display --indent 4 --text "- Principals without associated policy" --result "${STATUS_OK}" --color GREEN + fi + fi + +# +################################################################################# +# + + # Test : KRB-1040 + # Description : Check various attributes for Kerberos principals + Register --test-no KRB5-1040 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check various attributes for Kerberos principals" + if [ ${SKIPTEST} -eq 0 ]; then + FOUND=0 + for I in ${PRINCS} + do + J="$(${KADMINLOCALBINARY} getprinc "${I}" | ${SEDBINARY} -n 's/^Attributes:\s\+\(.\+\)$/\1/p')" + if ContainsString "^K/M@" "${I}" || \ + ContainsString "^kadmin/admin@" "${I}" || \ + ContainsString "^kadmin/changepw@" "${I}" || \ + ContainsString "^krbtgt/" "${I}" + then + if ! ContainsString "\bLOCKDOWN_KEYS\b" "${J}" + then + LogText "Result: Sensitive Kerberos principal ${I} does not have the lockdown_keys attribute" + FOUND=1 + fi + elif ContainsString "/admin@" "${I}" + then + if ! ContainsString "\bDISALLOW_TGT_BASED\b" "${J}" + then + LogText "Result: Kerberos admin principal ${I} does not have the disallow_tgt_based attribute" + FOUND=1 + fi + elif ContainsString "^[^/$]+@" "${I}" + then + if ! ContainsString "\bREQUIRES_PRE_AUTH\b.+\bDISALLOW_SVR\b" "${J}" + then + LogText "Result: Regular Kerberos user principal ${I} does not have the requires_pre_auth and/or the disallow_svr attribute" + FOUND=1 + fi + fi + done + if [ ${FOUND} -eq 1 ]; then + Display --indent 4 --text "- Checking principals for various attributes" --result "${STATUS_WARNING}" --color RED + ReportSuggestion "${TEST_NO}" "Harden your Kerberos principals with appropriate attributes" + else + Display --indent 4 --text "- Checking principals for various attributes" --result "${STATUS_OK}" --color GREEN + fi + fi + +# +################################################################################# +# + + # Test : KRB-1050 + # Description : Check for weak crypto + Register --test-no KRB-1050 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check for weak crypto" + if [ ${SKIPTEST} -eq 0 ]; then + FIND=$(${KDB5UTILBINARY} tabdump keyinfo | ${AWKBINARY} '$4 ~ /(des|arcfour|cbc|sha1)/{print$1,$4}') + if [ -n "${FIND}" ]; then + while read I J + do + LogText "Result: Kerberos principal ${I} has a key with weak cryptographic algorithm ${J}" + done << EOF +${FIND} +EOF + Display --indent 4 --text "- Principals with weak crypto" --result "${STATUS_WARNING}" --color RED + ReportSuggestion "${TEST_NO}" "Remove weak (des|arcfour|cbc|sha1) cryptographic keys from principals" + else + Display --indent 4 --text "- Principals with weak crypto" --result "${STATUS_OK}" --color GREEN + fi + fi + +# +################################################################################# +# + +unset PRINCS +unset I +unset J + +#EOF diff --git a/lynis b/lynis index ee6cc596..95135e92 100755 --- a/lynis +++ b/lynis @@ -1018,7 +1018,7 @@ ${NORMAL} if [ "${TEST_GROUP_TO_CHECK}" = "all" ]; then LogText "Info: perform tests from all categories" - INCLUDE_TESTS="boot_services kernel memory_processes authentication shells \ + INCLUDE_TESTS="boot_services kernel memory_processes authentication kerberos shells \ filesystems usb storage storage_nfs nameservices dns ports_packages networking printers_spoolers \ mail_messaging firewalls webservers ssh snmp databases ldap php squid logging \ insecure_services banners scheduling accounting time crypto virtualization containers \