-
Notifications
You must be signed in to change notification settings - Fork 124
/
Copy pathcis-audit
executable file
·1634 lines (1285 loc) · 59.1 KB
/
cis-audit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#!/bin/bash
#This script will run through several checks and for each check output to the terminal 'OK' or 'ERROR
#The checks are designed to test whether or not the host conforms to the benchmarks in the
#following document
#https://benchmarks.cisecurity.org/tools2/linux/CIS_CentOS_Linux_7_Benchmark_v1.1.0.pdf
#This is aimed to be a starting point for a sysadmin to check or audit hosts he/she supports
#It's envisaged that it will need customising to suit a particular environment
#e.g. there are about 200 checks, someone may want to chop out X of them to suit their environment
#The script does not change anything on the host, mostly it runs a lot of greps & cuts
#on config files.
#To quickly get an idea of what this script does have a look at the 'main' and 'func_wrapper' functions
#Copyright (c) 2015, Ross Hamilton. All rights reserved.
FSTAB='/etc/fstab'
YUM_CONF='/etc/yum.conf'
GRUB_CFG='/boot/grub2/grub.cfg'
GRUB_DIR='/etc/grub.d'
SELINUX_CFG='/etc/selinux/config'
NTP_CONF='/etc/ntp.conf'
SYSCON_NTPD='/etc/sysconfig/ntpd'
LIMITS_CNF='/etc/security/limits.conf'
SYSCTL_CNF='/etc/sysctl.conf'
CENTOS_REL='/etc/centos-release'
LATEST_REL_STR='CentOS Linux release 7.1.1503 (Core)'
HOSTS_ALLOW='/etc/hosts.allow'
HOSTS_DENY='/etc/hosts.deny'
CIS_CNF='/etc/modprobe.d/CIS.conf'
RSYSLOG_CNF='/etc/rsyslog.conf'
AUDITD_CNF='/etc/audit/auditd.conf'
AUDIT_RULES='/etc/audit/audit.rules'
LOGR_SYSLOG='/etc/logrotate.d/syslog'
ANACRONTAB='/etc/anacrontab'
CRONTAB='/etc/crontab'
CRON_HOURLY='/etc/cron.hourly'
CRON_DAILY='/etc/cron.daily'
CRON_WEEKLY='/etc/cron.weekly'
CRON_MONTHLY='/etc/cron.monthly'
CRON_DIR='/etc/cron.d'
AT_ALLOW='/etc/at.allow'
AT_DENY='/etc/at.deny'
CRON_ALLOW='/etc/cron.allow'
CRON_DENY='/etc/cron.deny'
SSHD_CFG='/etc/ssh/sshd_config'
SYSTEM_AUTH='/etc/pam.d/system-auth'
PWQUAL_CNF='/etc/security/pwquality.conf'
PASS_AUTH='/etc/pam.d/password-auth'
PAM_SU='/etc/pam.d/su'
GROUP='/etc/group'
LOGIN_DEFS='/etc/login.defs'
PASSWD='/etc/passwd'
SHADOW='/etc/shadow'
GSHADOW='/etc/gshadow'
BASHRC='/etc/bashrc'
PROF_D='/etc/profile.d'
MOTD='/etc/motd'
ISSUE='/etc/issue'
ISSUE_NET='/etc/issue.net'
BANNER_MSG='/etc/dconf/db/gdm.d/01-banner-message'
function separate_partition {
# Test that the supplied $1 is a separate partition
local filesystem="${1}"
grep -q "[[:space:]]${filesystem}[[:space:]]" "${FSTAB}" || return
}
function mount_option {
# Test the the supplied mount option $2 is in use on the supplied filesystem $1
local filesystem="${1}"
local mnt_option="${2}"
grep "[[:space:]]${filesystem}[[:space:]]" "${FSTAB}" | grep -q "${mnt_option}" || return
mount | grep "[[:space:]]${filesystem}[[:space:]]" | grep -q "${mnt_option}" || return
}
function bind_mounted_to {
# Test that a directory /foo/dir is bind mounted onto a particular filesystem
local directory="${1}"
local filesystem="${2}"
local E_NO_MOUNT_OUTPUT=1
grep "^${filesystem}[[:space:]]" "${FSTAB}" | grep -q "${directory}" || return
local grep_mount
grep_mount=$(mount | grep "^${filesystem}[[:space:]]" | grep "${directory}")
#If $directory doesn't appear in the mount output as mounted on the $filesystem
#it may appear in the output as being mounted on the same device as $filesystem, check for this
local fs_dev
local dir_dev
fs_dev="$(mount | grep "[[:space:]]${filesystem}[[:space:]]" | cut -d" " -f1)"
dir_dev="$(mount | grep "[[:space:]]${directory}[[:space:]]" | cut -d" " -f1)"
if [[ -z "${grep_mount}" ]] && [[ "${fs_dev}" != "${dir_dev}" ]] ; then
return "${E_NO_MOUNT_OUTPUT}"
fi
}
function test_disable_mounting {
# Test the the supplied filesystem type $1 is disabled
local module="${1}"
modprobe -n -v ${module} | grep -q "install \+/bin/true" || return
lsmod | grep -qv "${module}" || return
}
function centos_gpg_key_installed {
# Test CentOS GPG Key is installed
local centos_off_str='gpg(CentOS-7 Key (CentOS 7 Official Signing Key) <[email protected]>)'
rpm -q --queryformat "%{SUMMARY}\n" gpg-pubkey | grep -q "${centos_off_str}" || return
}
function yum_gpgcheck {
# Check that gpgcheck is Globally Activated
cut -d \# -f1 ${YUM_CONF} | grep 'gpgcheck' | grep -q 'gpgcheck=1' || return
}
function yum_update {
# Check for outstanding pkg update with yum
yum -q check-update || return
}
function pkg_integrity {
# Verify the installed packages by comparing the installed files against file info stored in the pkg
local rpm_out
rpm_out="$(rpm -qVa | awk '$2 != "c" { print $0}')"
[[ -z "${rpm_out}" ]] || return
}
function rpm_installed {
# Test whether an rpm is installed
local rpm="${1}"
local rpm_out
rpm_out="$(rpm -q --queryformat "%{NAME}\n" ${rpm})"
[[ "${rpm}" = "${rpm_out}" ]] || return
}
function verify_aide_cron {
# Verify there is a cron job scheduled to run the aide check
crontab -u root -l | cut -d\# -f1 | grep -q "aide \+--check" || return
}
function verify_selinux_grubcfg {
# Verify SELinux is not disabled in grub.cfg file
local grep_out1
grep_out1="$(grep selinux=0 ${GRUB_CFG})"
[[ -z "${grep_out1}" ]] || return
local grep_out2
grep_out2="$(grep enforcing=0 ${GRUB_CFG})"
[[ -z "${grep_out2}" ]] || return
}
function verify_selinux_state {
# Verify SELinux configured state in /etc/selinux/config
cut -d \# -f1 ${SELINUX_CFG} | grep 'SELINUX=' | tr -d '[[:space:]]' | grep -q 'SELINUX=enforcing' || return
}
function verify_selinux_policy {
# Verify SELinux policy in /etc/selinux/config
cut -d \# -f1 ${SELINUX_CFG} | grep 'SELINUXTYPE=' | tr -d '[[:space:]]' | grep -q 'SELINUXTYPE=targeted' || return
}
function rpm_not_installed {
# Check that the supplied rpm $1 is not installed
local rpm="${1}"
rpm -q ${rpm} | grep -q "package ${rpm} is not installed" || return
}
function unconfined_procs {
# Test for unconfined daemons
local ps_out
ps_out="$(ps -eZ | egrep 'initrc|unconfined' | egrep -v 'bash|ps|grep')"
[[ -n "${ps_out}" ]] || return
}
function check_grub_owns {
# Check User/Group Owner on grub.cfg file
stat -L -c "%u %g" ${GRUB_CFG} | grep -q '0 0' || return
}
function check_grub_perms {
# Check Perms on grub.cfg file
stat -L -c "%a" ${GRUB_CFG} | grep -q '.00' || return
}
function check_file_perms {
# Check Perms on a supplied file match supplied pattern
local file="${1}"
local pattern="${2}"
stat -L -c "%a" ${file} | grep -q "${pattern}" || return
}
function check_root_owns {
# Check User/Group Owner on the specified file
local file="${1}"
stat -L -c "%u %g" ${file} | grep -q '0 0' || return
}
function check_boot_pass {
grep -q 'set superusers=' "${GRUB_CFG}"
if [[ "$?" -ne 0 ]]; then
grep -q 'set superusers=' ${GRUB_DIR}/* || return
file="$(grep 'set superusers' ${GRUB_DIR}/* | cut -d: -f1)"
grep -q 'password' "${file}" || return
else
grep -q 'password' "${GRUB_CFG}" || return
fi
}
function check_svc_not_enabled {
# Verify that the service $1 is not enabled
local service="$1"
systemctl list-unit-files | grep -qv "${service}" && return
systemctl is-enabled "${service}" | grep -q 'enabled' || return
}
function check_svc_enabled {
# Verify that the service $1 is enabled
local service="$1"
systemctl list-unit-files | grep -q "${service}.service" || return
systemctl is-enabled "${service}" | grep -q 'enabled' && return
}
function ntp_cfg {
cut -d\# -f1 ${NTP_CONF} | egrep "restrict{1}[[:space:]]+default{1}" ${NTP_CONF} | grep kod \
| grep nomodify | grep notrap | grep nopeer | grep -q noquery || return
cut -d\# -f1 ${NTP_CONF} | egrep "restrict{1}[[:space:]]+\-6{1}[[:space:]]+default" | grep kod \
| grep nomodify | grep notrap | grep nopeer | grep -q noquery || return
cut -d\# -f1 ${NTP_CONF} | egrep -q "^[[:space:]]*server" || return
cut -d\# -f1 ${SYSCON_NTPD} | grep "OPTIONS=" | grep -q "ntp:ntp" || return
}
function restrict_core_dumps {
# Verify that suid programs cannot dump their core
egrep -q "\*{1}[[:space:]]+hard[[:space:]]+core[[:space:]]+0" "${LIMITS_CNF}" || return
cut -d\# -f1 ${SYSCTL_CNF} | grep fs.suid_dumpable | cut -d= -f2 | tr -d '[[:space:]]' | grep -q '0' || return
}
function chk_sysctl_cnf {
# Check the sysctl_conf file contains a particular flag, set to a particular value
local flag="$1"
local value="$2"
local sysctl_cnf="$3"
cut -d\# -f1 ${sysctl_cnf} | grep "${flag}" | cut -d= -f2 | tr -d '[[:space:]]' | grep -q "${value}" || return
}
function chk_sysctl {
local flag="$1"
local value="$2"
sysctl "${flag}" | cut -d= -f2 | tr -d '[[:space:]]' | grep -q "${value}" || return
}
function chk_latest_rel {
grep -q "${LATEST_REL_STR}" "${CENTOS_REL}" || return
}
function sticky_wrld_w_dirs {
dirs="$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -type d \
\( -perm -0002 -a ! -perm -1000 \))"
[[ -z "${dirs}" ]] || return
}
function check_umask {
cut -d\# -f1 /etc/sysconfig/init | grep -q "umask[[:space:]]027" || return
}
function check_def_tgt {
#Check that the default boot target is multi-user.target
local default_tgt
default_tgt="$(systemctl get-default)"
[[ "${default_tgt}" = "multi-user.target" ]] || return
}
function mta_local_only {
# If port 25 is being listened on, check it is on the loopback address
netstat_out="$(netstat -an | grep "LIST" | grep ":25[[:space:]]")"
if [[ "$?" -eq 0 ]] ; then
ip=$(echo ${netstat_out} | cut -d: -f1 | cut -d" " -f4)
[[ "${ip}" = "127.0.0.1" ]] || return
fi
}
function ip6_router_advertisements_dis {
# Check that IPv6 Router Advertisements are disabled
# If ipv6 is disabled then we don't mind what IPv6 router advertisements are set to
# If ipv6 is enabled then both settings should be set to zero
chk_sysctl net.ipv6.conf.all.disable_ipv6 1 && return
chk_sysctl net.ipv6.conf.all.accept_ra 0 || return
chk_sysctl net.ipv6.conf.default.accept_ra 0 || return
}
function ip6_redirect_accept_dis {
# Check that IPv6 Redirect Acceptance is disabled
# If ipv6 is disabled then we don't mind what IPv6 redirect acceptance is set to
# If ipv6 is enabled then both settings should be set to zero
chk_sysctl net.ipv6.conf.all.disable_ipv6 1 && return
chk_sysctl net.ipv6.conf.all.accept_redirects 0 || return
chk_sysctl net.ipv6.conf.default.accept_redirects 0 || return
}
function chk_file_exists {
local file="$1"
[[ -f "${file}" ]] || return
}
function chk_hosts_deny_content {
# Check the hosts.deny file resembles ALL: ALL
cut -d\# -f1 ${HOSTS_DENY} | grep -q "ALL[[:space:]]*:[[:space:]]*ALL" || return
}
function chk_cis_cnf {
local protocol="$1"
local file="$2"
grep -q "install[[:space:]]${protocol}[[:space:]]/bin/true" ${file} || return
}
function chk_rsyslog_content {
# rsyslog should be configured to send logs to a remote host
# grep output should resemble
# *.* @@loghost.example.com
grep -q "^*.*[^I][^I]*@" ${RSYSLOG_CNF} || return
}
function audit_log_storage_size {
# Check the max size of the audit log file is configured
cut -d\# -f1 ${AUDITD_CNF} | egrep -q "max_log_file[[:space:]]|max_log_file=" || return
}
function dis_on_audit_log_full {
# Check auditd.conf is configured to notify the admin and halt the system when audit logs are full
cut -d\# -f2 ${AUDITD_CNF} | grep 'space_left_action' | cut -d= -f2 | tr -d '[[:space:]]' | grep -q 'email' || return
cut -d\# -f2 ${AUDITD_CNF} | grep 'action_mail_acct' | cut -d= -f2 | tr -d '[[:space:]]' | grep -q 'root' || return
cut -d\# -f2 ${AUDITD_CNF} | grep 'admin_space_left_action' | cut -d= -f2 | tr -d '[[:space:]]' | grep -q 'halt' || return
}
function keep_all_audit_info {
# Check auditd.conf is configured to retain audit logs
cut -d\# -f2 ${AUDITD_CNF} | grep 'max_log_file_action' | cut -d= -f2 | tr -d '[[:space:]]' | grep -q 'keep_logs' || return
}
function audit_procs_prior_2_auditd {
# Check lines that start with linux have the audit=1 parameter set
grep_grub="$(grep "^[[:space:]]*linux" ${GRUB_CFG} | grep -v 'audit=1')"
[[ -z "${grep_grub}" ]] || return
}
function audit_date_time {
# Confirm that the time-change lines specified below do appear in the audit.rules file
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+time-change" | egrep "\-S[[:space:]]+settimeofday" \
| egrep "\-S[[:space:]]+adjtimex" | egrep "\-F[[:space:]]+arch=b64" | egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+time-change" | egrep "\-S[[:space:]]+settimeofday" \
| egrep "\-S[[:space:]]+adjtimex" | egrep "\-F[[:space:]]+arch=b32" | egrep "\-S[[:space:]]+stime" | egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+time-change" | egrep "\-F[[:space:]]+arch=b64" \
| egrep "\-S[[:space:]]+clock_settime" | egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+time-change" | egrep "\-F[[:space:]]+arch=b32" \
| egrep "\-S[[:space:]]+clock_settime" | egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+time-change" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/localtime" || return
}
function audit_user_group {
# Confirm that the identity lines specified below do appear in the audit.rules file
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+identity" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/group" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+identity" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/passwd" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+identity" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/gshadow" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+identity" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/shadow" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+identity" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/security\/opasswd" || return
}
function audit_network_env {
# Confirm that the system-locale lines specified below do appear in the audit.rules file
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+system-locale" | egrep "\-S[[:space:]]+sethostname" \
| egrep "\-S[[:space:]]+setdomainname" | egrep "\-F[[:space:]]+arch=b64" | egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+system-locale" | egrep "\-S[[:space:]]+sethostname" \
| egrep "\-S[[:space:]]+setdomainname" | egrep "\-F[[:space:]]+arch=b32" | egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+system-locale" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/issue" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+system-locale" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/issue.net" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+system-locale" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/hosts" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+system-locale" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/sysconfig\/network" || return
}
function audit_logins_logouts {
# Confirm that the logins lines specified below do appear in the audit.rules file
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+logins" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/var\/log\/faillog" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+logins" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/var\/log\/lastlog" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+logins" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/var\/log\/tallylog" || return
}
function audit_session_init {
# Confirm that the logins lines specified below do appear in the audit.rules file
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+session" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/var\/run\/utmp" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+session" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/var\/log\/wtmp" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+session" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/var\/log\/btmp" || return
}
function audit_sys_mac {
# Confirm that the logins lines specified below do appear in the audit.rules file
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+MAC-policy" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/selinux\/" || return
}
function audit_dac_perm_mod_events {
# Confirm that perm_mod lines matching the patterns below do appear in the audit.rules file
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+perm_mod" | egrep "\-S[[:space:]]+chmod" \
| egrep "\-S[[:space:]]+fchmod" | egrep "\-S[[:space:]]+fchmodat" | egrep "\-F[[:space:]]+arch=b64" \
| egrep "\-F[[:space:]]+auid>=1000" | egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+perm_mod" | egrep "\-S[[:space:]]+chmod" \
| egrep "\-S[[:space:]]+fchmod" | egrep "\-S[[:space:]]+fchmodat" | egrep "\-F[[:space:]]+arch=b32" \
| egrep "\-F[[:space:]]+auid>=1000" | egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+perm_mod" | egrep "\-S[[:space:]]+chown" \
| egrep "\-S[[:space:]]+fchown" | egrep "\-S[[:space:]]+fchownat" | egrep "\-S[[:space:]]+fchown" \
| egrep "\-F[[:space:]]+arch=b64" | egrep "\-F[[:space:]]+auid>=1000" | egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+perm_mod" | egrep "\-S[[:space:]]+chown" \
| egrep "\-S[[:space:]]+fchown" | egrep "\-S[[:space:]]+fchownat" | egrep "\-S[[:space:]]+fchown" \
| egrep "\-F[[:space:]]+arch=b32" | egrep "\-F[[:space:]]+auid>=1000" | egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+perm_mod" | egrep "\-S[[:space:]]+setxattr" \
| egrep "\-S[[:space:]]+lsetxattr" | egrep "\-S[[:space:]]+fsetxattr" | egrep "\-S[[:space:]]+removexattr" \
| egrep "\-S[[:space:]]+lremovexattr" | egrep "\-S[[:space:]]+fremovexattr" | egrep "\-F[[:space:]]+arch=b64" \
| egrep "\-F[[:space:]]+auid>=1000" | egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+perm_mod" | egrep "\-S[[:space:]]+setxattr" \
| egrep "\-S[[:space:]]+lsetxattr" | egrep "\-S[[:space:]]+fsetxattr" | egrep "\-S[[:space:]]+removexattr" \
| egrep "\-S[[:space:]]+lremovexattr" | egrep "\-S[[:space:]]+fremovexattr" | egrep "\-F[[:space:]]+arch=b32" \
| egrep "\-F[[:space:]]+auid>=1000" | egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
}
function unsuc_unauth_acc_attempts {
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+access" | egrep "\-S[[:space:]]+creat" \
| egrep "\-S[[:space:]]+open" | egrep "\-S[[:space:]]+openat" | egrep "\-S[[:space:]]+truncate" \
| egrep "\-S[[:space:]]+ftruncate" | egrep "\-F[[:space:]]+arch=b64" | egrep "\-F[[:space:]]+auid>=1000" \
| egrep "\-F[[:space:]]+auid\!=4294967295" | egrep "\-F[[:space:]]exit=\-EACCES" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+access" | egrep "\-S[[:space:]]+creat" \
| egrep "\-S[[:space:]]+open" | egrep "\-S[[:space:]]+openat" | egrep "\-S[[:space:]]+truncate" \
| egrep "\-S[[:space:]]+ftruncate" | egrep "\-F[[:space:]]+arch=b32" | egrep "\-F[[:space:]]+auid>=1000" \
| egrep "\-F[[:space:]]+auid\!=4294967295" | egrep "\-F[[:space:]]exit=\-EACCES" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+access" | egrep "\-S[[:space:]]+creat" \
| egrep "\-S[[:space:]]+open" | egrep "\-S[[:space:]]+openat" | egrep "\-S[[:space:]]+truncate" \
| egrep "\-S[[:space:]]+ftruncate" | egrep "\-F[[:space:]]+arch=b64" | egrep "\-F[[:space:]]+auid>=1000" \
| egrep "\-F[[:space:]]+auid\!=4294967295" | egrep "\-F[[:space:]]exit=\-EPERM" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+access" | egrep "\-S[[:space:]]+creat" \
| egrep "\-S[[:space:]]+open" | egrep "\-S[[:space:]]+openat" | egrep "\-S[[:space:]]+truncate" \
| egrep "\-S[[:space:]]+ftruncate" | egrep "\-F[[:space:]]+arch=b32" | egrep "\-F[[:space:]]+auid>=1000" \
| egrep "\-F[[:space:]]+auid\!=4294967295" | egrep "\-F[[:space:]]exit=\-EPERM" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
}
function coll_priv_cmds {
local priv_cmds
priv_cmds="$(find / -xdev \( -perm -4000 -o -perm -2000 \) -type f)"
for cmd in ${priv_cmds} ; do
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+privileged" | egrep "\-F[[:space:]]+path=${cmd}" \
| egrep "\-F[[:space:]]+perm=x" | egrep "\-F[[:space:]]+auid>=1000" | egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
done
}
function coll_suc_fs_mnts {
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+mounts" | egrep "\-S[[:space:]]+mount" \
| egrep "\-F[[:space:]]+arch=b64" | egrep "\-F[[:space:]]+auid>=1000" \
| egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+mounts" | egrep "\-S[[:space:]]+mount" \
| egrep "\-F[[:space:]]+arch=b32" | egrep "\-F[[:space:]]+auid>=1000" \
| egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
}
function coll_file_del_events {
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+delete" | egrep "\-S[[:space:]]+unlink" \
| egrep "\-F[[:space:]]+arch=b64" | egrep "\-S[[:space:]]+unlinkat" | egrep "\-S[[:space:]]+rename" \
| egrep "\-S[[:space:]]+renameat" | egrep "\-F[[:space:]]+auid>=1000" \
| egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+delete" | egrep "\-S[[:space:]]+unlink" \
| egrep "\-F[[:space:]]+arch=b32" | egrep "\-S[[:space:]]+unlinkat" | egrep "\-S[[:space:]]+rename" \
| egrep "\-S[[:space:]]+renameat" | egrep "\-F[[:space:]]+auid>=1000" \
| egrep "\-F[[:space:]]+auid\!=4294967295" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
}
function coll_chg2_sysadm_scope {
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+scope" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/etc\/sudoers" || return
}
function coll_sysadm_actions {
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+actions" | egrep "\-p[[:space:]]+wa" \
| egrep -q "\-w[[:space:]]+\/var\/log\/sudo.log" || return
}
function kmod_lod_unlod {
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+modules" | egrep "\-p[[:space:]]+x" \
| egrep -q "\-w[[:space:]]+\/sbin\/insmod" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+modules" | egrep "\-p[[:space:]]+x" \
| egrep -q "\-w[[:space:]]+\/sbin\/rmmod" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+modules" | egrep "\-p[[:space:]]+x" \
| egrep -q "\-w[[:space:]]+\/sbin\/modprobe" || return
cut -d\# -f1 ${AUDIT_RULES} | egrep "\-k[[:space:]]+modules" | egrep "\-S[[:space:]]+delete_module" \
| egrep "\-F[[:space:]]+arch=b64" | egrep "\-S[[:space:]]+init_module" \
| egrep -q "\-a[[:space:]]+always,exit|\-a[[:space:]]+exit,always" || return
}
function audit_cfg_immut {
# There should be a "-e 2" at the end of the audit.rules file
cut -d\# -f1 ${AUDIT_RULES} | egrep -q "^-e[[:space:]]+2" || return
}
function logrotate_cfg {
[[ -f "${LOGR_SYSLOG}" ]] || return
local timestamp
timestamp=$(date '+%Y%m%d_%H%M%S')
local tmp_data="/tmp/logrotate.tmp.${timestamp}"
local file_list="/var/log/messages /var/log/secure /var/log/maillog /var/log/spooler /var/log/boot.log /var/log/cron"
local line_num
line_num=$(grep -n '{' "${LOGR_SYSLOG}" | cut -d: -f1)
line_num=$((${line_num} - 1))
head -${line_num} "${LOGR_SYSLOG}" > ${tmp_data}
for file in ${file_list} ; do
grep -q "${file}" ${tmp_data} || return
done
rm "${tmp_data}"
}
function atd_cfg {
[[ ! -f ${AT_DENY} ]] || return
[[ -f ${AT_ALLOW} ]] || return
check_root_owns "${AT_ALLOW}"
check_file_perms "${AT_ALLOW}" 600
}
function at_cron_auth_users {
[[ ! -f ${AT_DENY} ]] || return
[[ ! -f ${CRON_DENY} ]] || return
check_root_owns "${CRON_ALLOW}"
check_root_owns "${AT_ALLOW}"
check_file_perms "${CRON_ALLOW}" 600
check_file_perms "${AT_ALLOW}" 600
}
function chk_param {
local file="${1}"
local parameter="${2}"
local value="${3}"
cut -d\# -f1 ${file} | egrep -q "^${parameter}[[:space:]]+${value}" || return
}
function ssh_maxauthtries {
local allowed_max="${1}"
local actual_value
actual_value=$(cut -d\# -f1 ${SSHD_CFG} | grep 'MaxAuthTries' | cut -d" " -f2)
[[ ${actual_value} -le ${allowed_max} ]] || return
}
function ssh_access {
local allow_users
local allow_groups
local deny_users
local deny_users
allow_users="$(cut -d\# -f1 ${SSHD_CFG} | grep "AllowUsers" | cut -d" " -f2)"
allow_groups="$(cut -d\# -f1 ${SSHD_CFG} | grep "AllowGroups" | cut -d" " -f2)"
deny_users="$(cut -d\# -f1 ${SSHD_CFG} | grep "DenyUsers" | cut -d" " -f2)"
deny_groups="$(cut -d\# -f1 ${SSHD_CFG} | grep "DenyGroups" | cut -d" " -f2)"
[[ -n "${allow_users}" ]] || return
[[ -n "${allow_groups}" ]] || return
[[ -n "${deny_users}" ]] || return
[[ -n "${deny_groups}" ]] || return
}
function pass_hash_algo {
local algo="${1}"
authconfig --test | grep 'hashing' | grep -q "${algo}" || return
}
function pass_req_params {
# verify the pam_pwquality.so params in /etc/pam.d/system-auth
grep pam_pwquality.so ${SYSTEM_AUTH} | grep 'password' | grep 'requisite' | grep 'try_first_pass' | grep 'local_users_only' | grep 'retry=3' | grep -q 'authtok_type=' || return
grep -q 'minlen=14' ${PWQUAL_CNF} || return
grep -q 'dcredit=-1' ${PWQUAL_CNF} || return
grep -q 'ucredit=-1' ${PWQUAL_CNF} || return
grep -q 'ocredit=-1' ${PWQUAL_CNF} || return
grep -q 'lcredit=-1' ${PWQUAL_CNF} || return
}
function failed_pass_lock {
egrep "auth[[:space:]]+required" ${PASS_AUTH} | grep -q 'pam_deny.so' || return
egrep "auth[[:space:]]+required" ${PASS_AUTH} | grep 'pam_faillock.so' | grep 'preauth' | grep 'audit' | grep 'silent' | grep 'deny=5' | grep -q 'unlock_time=900' || return
grep 'auth' ${PASS_AUTH} | grep 'pam_unix.so' | egrep -q "\[success=1[[:space:]]+default=bad\]" || return
grep 'auth' ${PASS_AUTH} | grep 'pam_faillock.so' | grep 'authfail' | grep 'audit' | grep 'deny=5' | grep 'unlock_time=900' | egrep -q "\[default=die\]" || return
egrep "auth[[:space:]]+sufficient" ${PASS_AUTH} | grep 'pam_faillock.so' | grep 'authsucc' | grep 'audit' | grep 'deny=5' | grep -q 'unlock_time=900' || return
egrep "auth[[:space:]]+required" ${PASS_AUTH} | grep -q 'pam_deny.so' || return
egrep "auth[[:space:]]+required" ${SYSTEM_AUTH} | grep -q 'pam_env.so' || return
egrep "auth[[:space:]]+required" ${SYSTEM_AUTH} | grep 'pam_faillock.so' | grep 'preauth' | grep 'audit' | grep 'silent' | grep 'deny=5' | grep -q 'unlock_time=900' || return
grep 'auth' ${SYSTEM_AUTH} | grep 'pam_unix.so' | egrep -q "\[success=1[[:space:]]+default=bad\]" || return
grep 'auth' ${SYSTEM_AUTH} | grep 'pam_faillock.so' | grep 'authfail' | grep 'audit' | grep 'deny=5' | grep 'unlock_time=900' | egrep -q "\[default=die\]" || return
egrep "auth[[:space:]]+sufficient" ${SYSTEM_AUTH} | grep 'pam_faillock.so' | grep 'authsucc' | grep 'audit' | grep 'deny=5' | grep -q 'unlock_time=900' || return
egrep "auth[[:space:]]+required" ${SYSTEM_AUTH} | grep -q 'pam_deny.so' || return
}
function lim_passwd_reuse {
egrep "auth[[:space:]]+sufficient" ${SYSTEM_AUTH} | grep 'pam_unix.so' | grep -q 'remember=5' || return
}
function su_access {
egrep "auth[[:space:]]+required" "${PAM_SU}" | grep 'pam_wheel.so' | grep -q 'use_uid' || return
grep 'wheel' "${GROUP}" | cut -d: -f4 | grep -q 'root' || return
}
function dis_sys_accs {
# Check that system accounts are disabled
local accounts
accounts="$(egrep -v "^\+" /etc/passwd | awk -F: '($1!="root" && $1!="sync" && $1!="shutdown" \
&& $1!="halt" && $3<1000 && $7!="/sbin/nologin") {print}')"
[[ -z "${accounts}" ]] || return
}
function root_def_grp {
local gid1
local gid2
gid1="$(grep "^root:" "${PASSWD}" | cut -d: -f4)"
[[ "${gid1}" -eq 0 ]] || return
gid2="$(id -g root)"
[[ "${gid2}" -eq 0 ]] || return
}
function def_umask_for_users {
cut -d\# -f1 "${BASHRC}" | egrep -q "umask[[:space:]]+077" || return
egrep -q "umask[[:space:]]+077" ${PROF_D}/* || return
}
function inactive_usr_acs_locked {
# After being inactive for a period of time the account should be disabled
local days
local inactive_threshold=35
days="$(useradd -D | grep INACTIVE | cut -d= -f2)"
[[ ${days} -ge ${inactive_threshold} ]] || return
}
function warning_banners {
# Check that system login banners don't contain any OS information
local motd
local issue
local issue_net
motd="$(egrep '(\\v|\\r|\\m|\\s)' ${MOTD})"
issue="$(egrep '(\\v|\\r|\\m|\\s)' ${ISSUE})"
issue_net="$(egrep '(\\v|\\r|\\m|\\s)' ${ISSUE_NET})"
[[ -z "${motd}" ]] || return
[[ -z "${issue}" ]] || return
[[ -z "${issue_net}" ]] || return
}
function gnome_banner {
# On a host aiming to meet CIS requirements GNOME is unlikely to be installed
# Thus the function says if the file exists then it should have these lines in it
if [[ -f "${BANNER_MSG}" ]] ; then
egrep '[org/gnome/login-screen]' ${BANNER_MSG} || return
egrep 'banner-message-enable=true' ${BANNER_MSG} || return
egrep 'banner-message-text=' ${BANNER_MSG} || return
fi
}
function unowned_files {
local uo_files
uo_files="$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -nouser)"
[[ -z "${uo_files}" ]] || return
}
function ungrouped_files {
local ug_files
ug_files="$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -nogroup)"
[[ -z "${ug_files}" ]] || return
}
function suid_exes {
# For every suid exe on the host use the rpm cmd to verify that it should be suid executable
# If the rpm cmd returns no output then the rpm is as it was when it was installed so no prob
local suid_exes rpm rpm_out
suid_exes="$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -type f -perm -4000 -print)"
for suid_exe in ${suid_exes}
do
rpm=$(rpm -qf $suid_exe)
rpm_out="$(rpm -V --noconfig $rpm | grep $suid_exe)"
[[ -z "${rpm_out}" ]] || return
done
}
function sgid_exes {
# For every sgid exe on the host use the rpm cmd to verify that it should be sgid executable
# If the rpm cmd returns no output then the rpm is as it was when it was installed so no prob
local sgid_exes rpm rpm_out
sgid_exes="$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -type f -perm -4000 -print)"
for sgid_exe in ${sgid_exes}
do
rpm=$(rpm -qf $suid_exe)
rpm_out="$(rpm -V --noconfig $rpm | grep $suid_exe)"
[[ -z "${rpm_out}" ]] || return
done
}
function passwd_field_chk {
local shadow_out
shadow_out="$(awk -F: '($2 == "" ) { print $1 }' ${SHADOW})"
[[ -z "${shadow_out}" ]] || return
}
function nis_in_file {
# Check for lines starting with + in the supplied file $1
# In /etc/{passwd,shadow,group} it used to be a marker to insert data from NIS
# There shouldn't be any entries like this
local file="${1}"
local grep_out
grep_out="$(grep '^+:' ${file})"
[[ -z "${grep_out}" ]] || return
}
function no_uid0_other_root {
local grep_passwd
grep_passwd="$(awk -F: '($3 == 0) { print $1 }' ${PASSWD})"
[[ "${grep_passwd}" = "root" ]] || return
}
function world_w_dirs {
dirs="$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -type f -perm -0002)"
[[ -z "${dirs}" ]] || return
}
function root_path {
# There should not be an empty dir in $PATH
local grep=/bin/grep
local sed=/bin/sed
path_grep="$(echo ${PATH} | ${grep} '::')"
[[ -z "${path_grep}" ]] || return
# There should not be a trailing : on $PATH
path_grep="$(echo ${PATH} | ${grep} :$)"
[[ -z "${path_grep}" ]] || return
path_dirs="$(echo $PATH | ${sed} -e 's/::/:/' -e 's/:$//' -e 's/:/ /g')"
for dir in ${path_dirs} ; do
# PATH should not contain .
[[ "${dir}" != "." ]] || return
#$dir should be a directory
[[ -d "${dir}" ]] || return
local ls_out
ls_out="$(ls -ldH ${dir})"
if is_group_writable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_other_writable ${ls_out} ; then return 1 ; else return 0 ; fi
# Directory should be owned by root
dir_own="$(echo ${ls_out} | awk '{print $3}')"
[[ "${dir_own}" = "root" ]] || return
done
}
function is_group_readable {
local ls_output="${1}"
# 5th byte of ls output is the field for group readable
[[ "${ls_output:4:1}" = "r" ]] || return
}
function is_group_writable {
local ls_output="${1}"
# 6th byte of ls output is the field for group writable
[[ "${ls_output:5:1}" = "w" ]] || return
}
function is_group_executable {
local ls_output="${1}"
# 7th byte of ls output is the field for group readable
[[ "${ls_output:6:1}" = "r" ]] || return
}
function is_other_readable {
local ls_output="${1}"
# 8th byte of ls output is the field for other readable
[[ "${ls_output:7:1}" = "r" ]] || return
}
function is_other_writable {
local ls_output="${1}"
# 9th byte of ls output is the field for other writable
[[ "${ls_output:8:1}" = "w" ]] || return
}
function is_other_executable {
local ls_output="${1}"
# 10th byte of ls output is the field for other executable
[[ "${ls_output:9:1}" = "x" ]] || return
}
function home_dir_perms {
dirs="$(grep -v 'root|halt|sync|shutdown' ${PASSWD} | awk -F: '($7 != "/sbin/nologin") { print $6 }')"
[[ -z "${dirs}" ]] && return
for dir in ${dirs} ; do
[[ -d "${dir}" ]] || continue
local ls_out
ls_out="$(ls -ldH ${dir})"
if is_group_writable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_other_readable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_other_writable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_other_executable ${ls_out} ; then return 1 ; else return 0 ; fi
done
}
function dot_file_perms {
dirs="$(grep -v 'root|halt|sync|shutdown' ${PASSWD} | awk -F: '($7 != "/sbin/nologin") { print $6 }')"
for dir in ${dirs} ; do
[[ -d "${dir}" ]] || continue
for file in ${dir}/.[A-Za-z0-9]* ; do
if [[ ! -h "${file}" && -f "${file}" ]] ; then
local ls_out
ls_out="$(ls -ldH ${dir})"
if is_group_writable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_other_writable ${ls_out} ; then return 1 ; else return 0 ; fi
fi
done
done
}
function dot_rhosts_files {
dirs="$(grep -v 'root|halt|sync|shutdown' ${PASSWD} | awk -F: '($7 != "/sbin/nologin") { print $6 }')"
for dir in ${dirs} ; do
[[ -d "${dir}" ]] || continue
local file="${dir}/.rhosts"
if [[ ! -h "${file}" && -f "${file}" ]] ; then
return 1
else
return 0
fi
done
}
function chk_groups_passwd {
# We don't want to see any groups in /etc/passwd that aren't in /etc/group
group_ids="$(cut -s -d: -f4 ${PASSWD} | sort -u)"
for group_id in ${group_ids} ; do
grep -q -P "^.*?:x:${group_id}:" ${GROUP} || return
done
}
function chk_home_dirs_exist {
#Check that users home directory do all exist
while read user uid dir ; do
if [[ "${uid}" -ge 1000 && ! -d "${dir}" && "${user}" != "nfsnobody" ]] ; then
return 1
fi
done < <(awk -F: '{ print $1 " " $3 " " $6 }' ${PASSWD})
}
function chk_home_dirs_owns {
#Check that users home directory do all exist
while read user uid dir ; do
if [[ "${uid}" -ge 1000 && ! -d "${dir}" && "${user}" != "nfsnobody" ]] ; then
local owner
owner="$(stat -L -c "%U" "${dir}")"
[[ "${owner}" = "${user}" ]] || return
fi
done < <(awk -F: '{ print $1 " " $3 " " $6 }' ${PASSWD})
}
function dot_netrc_perms {
dirs="$(grep -v 'root|halt|sync|shutdown' ${PASSWD} | awk -F: '($7 != "/sbin/nologin") { print $6 }')"
for dir in ${dirs} ; do
[[ -d "${dir}" ]] || continue
for file in ${dir}/.netrc ; do
if [[ ! -h "${file}" && -f "${file}" ]] ; then
local ls_out
ls_out="$(ls -ldH ${dir})"
if is_group_readable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_group_writable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_group_executable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_other_readable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_other_writable ${ls_out} ; then return 1 ; else return 0 ; fi
if is_other_executable ${ls_out} ; then return 1 ; else return 0 ; fi
fi
done
done
}
function user_dot_netrc {
# We don't want to see any ~/.netrc files
local dirs
dirs="$(cut -d: -f6 ${PASSWD})"
for dir in ${dirs} ; do
[[ -d "${dir}" ]] || continue
if [[ ! -h "${dir}/.netrc" && -f "${dir}/.netrc" ]] ; then
return 1
fi
done
}
function user_dot_forward {
# We don't want to see any ~/.forward files
local dirs
dirs="$(cut -d: -f6 ${PASSWD})"
for dir in ${dirs} ; do
[[ -d "${dir}" ]] || continue
if [[ ! -h "${dir}/.forward" && -f "${dir}/.forward" ]] ; then
return 1
fi
done
}
function duplicate_uids {
local num_of_uids
local uniq_num_of_uids
num_of_uids="$(cut -f3 -d":" ${PASSWD} | wc -l)"
uniq_num_of_uids="$(cut -f3 -d":" ${PASSWD} | sort -n | uniq | wc -l)"
[[ "${num_of_uids}" -eq "${uniq_num_of_uids}" ]] || return
}
function duplicate_gids {
local num_of_gids
local uniq_num_of_gids
num_of_gids="$(cut -f3 -d":" ${GROUP} | wc -l)"
uniq_num_of_gids="$(cut -f3 -d":" ${GROUP} | sort -n | uniq | wc -l)"
[[ "${num_of_gids}" -eq "${uniq_num_of_gids}" ]] || return
}
function chk_uids_4_res {
local default_users='root bin daemon adm lp sync shutdown halt mail news uucp operator games \
gopher ftp nobody nscd vcsa rpc mailnull smmsp pcap ntp dbus avahi sshd rpcuser systemd-network \
nfsnobody haldaemon avahi-autoipd distcache apache oprofile webalizer dovecot squid \
named xfs gdm sabayon usbmuxd rtkit abrt saslauth pulse postfix tcpdump polkitd tss chrony'
while read user uid; do
local found=0
for duser in ${default_users} ${custom_system_users}; do
if [[ "${user}" = "${duser}" ]] ; then
found=1
fi
done
[[ "${found}" -eq 1 ]] || return
done < <(awk -F: '($3 < 1000) {print $1" "$3 }' ${PASSWD})
}
function duplicate_usernames {
local num_of_usernames
local num_of_uniq_usernames
num_of_usernames="$(cut -f1 -d":" ${PASSWD} | wc -l)"