From ac526be452c6e09d179680e3aa5e587ac47d5619 Mon Sep 17 00:00:00 2001 From: pyllyukko Date: Wed, 14 Feb 2024 21:12:55 +0200 Subject: [PATCH] Added initial version of a Kerberos plugin --- default.prf | 1 + include/binaries | 1 + plugins/plugin_krb5_phase1 | 121 +++++++++++++++++++++++++++++++++++++ 3 files changed, 123 insertions(+) create mode 100644 plugins/plugin_krb5_phase1 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..b65d5159 100644 --- a/include/binaries +++ b/include/binaries @@ -196,6 +196,7 @@ 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) - ${BINARY}" ;; kldstat) KLDSTATBINARY="${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) - ${BINARY}" ;; diff --git a/plugins/plugin_krb5_phase1 b/plugins/plugin_krb5_phase1 new file mode 100644 index 00000000..5a480dcb --- /dev/null +++ b/plugins/plugin_krb5_phase1 @@ -0,0 +1,121 @@ +#!/bin/sh + +######################################################################### +# +# * DO NOT REMOVE * +#----------------------------------------------------- +# PLUGIN_AUTHOR="pyllyukko" +# PLUGIN_CATEGORY=security +# PLUGIN_DATE=2024-02-14 +# PLUGIN_DESC=Kerberos +# PLUGIN_NAME=krb5 +# PLUGIN_REQUIRED_TESTS= +# PLUGIN_VERSION=0.1 +#----------------------------------------------------- +# +######################################################################### +# + + # Test for the prerequisites first + if [ -n "${KADMINLOCALBINARY}" ] + 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 + + # Test : KRB5-0001 + # Description : Check that Kerberos principals have passwords that expire + Register --test-no KRB5-0001 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check that Kerberos principals have passwords that expire" --progress + 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" + fi + done + fi +# +################################################################################# +# + + # Test : KRB5-0002 + # Description : Check last password change for Kerberos principals + Register --test-no KRB5-0002 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check last password change for Kerberos principals" --progress + if [ ${SKIPTEST} -eq 0 ]; then + 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 ${I} has a password/key that has never been changed" + else + J="$(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" + fi + fi + done + fi + +# +################################################################################# +# + + # Test : KRB5-0003 + # Description : Check that Kerberos principals have a policy associated to them + Register --test-no KRB5-0003 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check that Kerberos principals have a policy associated to them" --progress + if [ ${SKIPTEST} -eq 0 ]; then + 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" + fi + done + fi + +# +################################################################################# +# + + # Test : KRB5-0004 + # Description : Check various attributes for Kerberos principals + Register --test-no KRB5-0004 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check various attributes for Kerberos principals" --progress + if [ ${SKIPTEST} -eq 0 ]; then + 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" + fi + fi + done + fi + +# +################################################################################# +# + +unset PRINCS +unset I +unset J + +#EOF