blob: 022360445777ca3f3d84c2714e1b99e02a53346f (
plain)
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
|
#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2018, CISOfy
#
# Website : https://cisofy.com
# Blog : http://linux-audit.com
# GitHub : https://github.com/CISOfy/lynis
#
# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
# welcome to redistribute it under the terms of the GNU General Public License.
# See LICENSE file for usage of this software.
#
#################################################################################
#
# E-mail and messaging
#
#################################################################################
#
InsertSection "Software: e-mail and messaging"
#
#################################################################################
#
DOVECOT_RUNNING=0
EXIM_RUNNING=0
EXIM_TYPE=""
IMAP_DAEMON=""
OPENSMTPD_RUNNING=0
POP3_DAEMON=""
POSTFIX_RUNNING=0
QMAIL_RUNNING=0
SENDMAIL_RUNNING=0
SMTP_DAEMON=""
#
#################################################################################
#
# Test : MAIL-8802
# Description : Check Exim process status
Register --test-no MAIL-8802 --weight L --network NO --category security --description "Check Exim status"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: check Exim status"
IsRunning exim4 || IsRunning exim
if [ ${RUNNING} -eq 1 ]; then
LogText "Result: found running Exim process"
Display --indent 2 --text "- Exim status" --result "${STATUS_RUNNING}" --color GREEN
EXIM_RUNNING=1
SMTP_DAEMON="exim"
Report "smtp_daemon[]=exim"
else
LogText "Result: no running Exim processes found"
if IsVerbose; then Display --indent 2 --text "- Exim status" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8804
# Description : Exim configuration options
if [ ${EXIM_RUNNING} -eq 1 -a ! "${EXIMBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no MAIL-8803 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Exim configuration options"
if [ ${SKIPTEST} -eq 0 -a ${EXIM_RUNNING} -eq 1 ]; then
LogText "Test: Exim configuration options"
EXIM_ROUTERS=$(exim -bP router_list)
unset FIND FIND2 FIND3 FIND4
# Local Only
FIND=$(echo "${EXIM_ROUTERS}" | ${EGREPBINARY} '^nonlocal')
# Internet Host
FIND2=$(echo "${EXIM_ROUTERS}" | ${EGREPBINARY} '^dnslookup_relay_to_domains')
# Smarthost or Satellite
FIND3=$(echo "${EXIM_ROUTERS}" | ${EGREPBINARY} '^smarthost')
if [ ! -z "${FIND}" ]; then
EXIM_TYPE="LOCAL ONLY"
elif [ ! -z "${FIND2}" ]; then
EXIM_TYPE="INTERNET HOST"
elif [ ! -z "${FIND3}" ]; then
FIND4=$(echo "${EXIM_ROUTERS}" | ${EGREPBINARY} '^hub_user_smarthost')
if [ ! -z "${FIND4}" ]; then
EXIM_TYPE="SATELLITE"
else
EXIM_TYPE="SMARTHOST"
fi
fi
if [ ! -z "${EXIM_TYPE}" ]; then
LogText "Result: Exim Type - ${EXIM_TYPE}"
Display --indent 4 --text "- Type" --result "${EXIM_TYPE}" --color GREEN
else
LogText "Result: Exim Type - Not Configured"
Display --indent 4 --text "- Type" --result "Not Configured" --color WHITE
fi
if [ "${EXIM_TYPE}" = "INTERNET HOST" -o "${EXIM_TYPE}" = "SMARTHOST" ]; then
LogText "Test: Exim Public Interfaces"
EXIM_IP=$(exim -bP local_interfaces | cut -d '=' -f2 | sed -e 's/\s*<\s*\;\?//' -e 's/\s*::0\s*\;\?//' -e 's/\s*127.0.0.1\s*\;\?//' -e 's/^\s*//' -e 's/\s*$//')
if [ ! -z "${EXIM_IP}" ]; then
LogText "Result: ${EXIM_IP}"
Display --indent 4 --text "- Public Interface(s)" --result "${EXIM_IP}" --color GREEN
else
LogText "Result: None"
Display --indent 4 --text "- Public Interface(s)" --result "NONE" --color WHITE
fi
LogText "Test: Exim TLS State"
EXIM_TLS=$(exim -bP tls_advertise_hosts | cut -d '=' -f2 | sed -e 's/^\s*//' -e 's/\s*$//')
if [ ! -z "${EXIM_TLS}" ]; then
LogText "Result: Enabled"
Display --indent 4 --text "- TLS" --result "ENABLED" --color GREEN
else
LogText "Result: Not enabled"
Display --indent 4 --text "- TLS" --result "NOT ENABLED" --color WHITE
fi
fi
if [ ! -z "${EXIM_TYPE}" -a "${EXIM_TYPE}" != "LOCAL ONLY" ]; then
LogText "Test: Exim Certificate and Private Key"
case "${EXIM_TYPE}" in
"INTERNET HOST" | "SMARTHOST" )
EXIM_CERTIFICATE=$(exim -bP tls_certificate | cut -d '=' -f2 | sed -e 's/^\s*//' -e 's/\s*$//')
EXIM_PRIVATEKEY=$(exim -bP tls_privatekey | cut -d '=' -f2 | sed -e 's/^\s*//' -e 's/\s*$//')
;;
"SATELLITE" )
EXIM_CERTIFICATE=$(exim -bP transport remote_smtp_smarthost | grep tls_certificate | cut -d '=' -f2 | sed -e 's/^\s*//' -e 's/\s*$//')
EXIM_PRIVATEKEY=$(exim -bP transport remote_smtp_smarthost | grep tls_privatekey | cut -d '=' -f2 | sed -e 's/^\s*//' -e 's/\s*$//')
;;
esac
if [ ! -z "${EXIM_CERTIFICATE}" ]; then
LogText "Result: ${EXIM_CERTIFICATE}"
if [ -f "${EXIM_CERTIFICATE}" ]; then
Display --indent 4 --text "- Certificate" --result "${STATUS_FOUND}" --color GREEN
LogText "Result: Certificate found."
else
Display --indent 4 --text "- Certificate" --result "${STATUS_NOT_FOUND}" --color YELLOW
LogText "Result: Certificate not found."
fi
else
LogText "Result: Certificate not set."
Display --indent 4 --text "- Certificate not set" --result "${STATUS_WARNING}" --color WHITE
fi
if [ ! -z "${EXIM_PRIVATEKEY}" ]; then
LogText "Result: ${EXIM_PRIVATEKEY}"
if [ -f "${EXIM_PRIVATEKEY}" ]; then
LogText "Result: Private Key found."
Display --indent 4 --text "- Private Key" --result "${STATUS_FOUND}" --color GREEN
else
Display --indent 4 --text "- Private Key" --result "${STATUS_NOT_FOUND}" --color YELLOW
LogText "Result: Private Key not found."
fi
else
LogText "Result: Private Key not set."
Display --indent 4 --text "- Private Key not set" --result "${STATUS_WARNING}" --color WHITE
fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8814
# Description : Check Postfix process
# Notes : qmgr and pickup run under postfix uid, without full path to binary
Register --test-no MAIL-8814 --weight L --network NO --category security --description "Check postfix process status"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: check Postfix status"
# Some other processes also use master, therefore it should include both master and postfix
FIND1=$(${PSBINARY} ax | ${GREPBINARY} "master" | ${GREPBINARY} "postfix" | ${GREPBINARY} -v "grep")
if [ ! -z "${FIND1}" ]; then
LogText "Result: found running Postfix process"
Display --indent 2 --text "- Postfix status" --result "${STATUS_RUNNING}" --color GREEN
POSTFIX_RUNNING=1
SMTP_DAEMON="postfix"
Report "smtp_daemon[]=postfix"
else
LogText "Result: no running Postfix processes found"
if IsVerbose; then Display --indent 2 --text "- Postfix status" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8816
# Description : Check Postfix configuration
if [ ${POSTFIX_RUNNING} -eq 1 -a ! "${POSTFIXBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no MAIL-8816 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check Postfix configuration"
if [ ${SKIPTEST} -eq 0 ]; then
Display --indent 4 --text "- Postfix configuration" --result "${STATUS_FOUND}" --color GREEN
POSTFIX_CONFIGDIR=$(${POSTCONFBINARY} 2> /dev/null | ${GREPBINARY} '^config_directory' | ${AWKBINARY} '{ print $3 }')
POSTFIX_CONFIGFILE="${POSTFIX_CONFIGDIR}/main.cf"
LogText "Postfix configuration directory: ${POSTFIX_CONFIGDIR}"
LogText "Postfix configuration file: ${POSTFIX_CONFIGFILE}"
fi
#
#################################################################################
#
# Test : MAIL-8817
# Description : Check Postfix configuration for error
if [ ${POSTFIX_RUNNING} -eq 1 -a ! "${POSTFIXBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no MAIL-8817 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check Postfix configuration errors"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: using postconf to see if Postfix configuration has errors"
FIND=$(${POSTCONFBINARY} 2>&1 | ${GREPBINARY} "warning:")
if [ ! -z "${FIND}" ]; then
Report "postfix_config_error=1"
Display --indent 6 --text "- Postfix configuration errors" --result "${STATUS_WARNING}" --color RED
LogText "Result: found an error or warning in the Postfix configuration. Manual check suggested."
ReportSuggestion ${TEST_NO} "Found a configuration error in Postfix" "${POSTFIX_CONFIGFILE}" "text:run postconf > /dev/null"
else
LogText "Result: all looks to be fine with Postfix configuration"
if IsVerbose; then Display --indent 6 --text "- Postfix configuration errors" --result "${STATUS_OK}" --color GREEN; fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8818
# Description : Check Postfix configuration
if [ ${POSTFIX_RUNNING} -eq 1 -a ! "${POSTFIXBINARY}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no MAIL-8818 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check Postfix configuration: banner"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: Checking Postfix banner"
FIND1=$(${POSTCONFBINARY} 2> /dev/null | ${GREPBINARY} '^smtpd_banner' | ${GREPBINARY} 'postfix')
FIND2=$(${POSTCONFBINARY} 2> /dev/null | ${GREPBINARY} '^smtpd_banner' | ${GREPBINARY} '$mail_name')
FIND3=$(${POSTCONFBINARY} 2> /dev/null | ${GREPBINARY} '^mail_name' | ${GREPBINARY} -i 'postfix')
FIND4=$(${POSTCONFBINARY} 2> /dev/null | ${GREPBINARY} '^smtpd_banner' | ${GREPBINARY} -i "${OS}")
if [ ! -z "${LINUX_VERSION}" ]; then
FIND5=$(${POSTCONFBINARY} 2> /dev/null | ${GREPBINARY} '^smtpd_banner' | ${GREPBINARY} -i "${LINUX_VERSION}")
fi
SHOWWARNING=0
if [ ! -z "${FIND1}" ]; then
SHOWWARNING=1
Report "banner_software_disclosure[]=${FIND1}"
elif [ ! -z "${FIND2}" -a ! -z "${FIND3}" ]; then
SHOWWARNING=1
Report "banner_software_disclosure[]=${FIND2}"
elif [ ! -z "${FIND4}" ]; then
SHOWWARNING=1
Report "banner_os_disclosure[]=${FIND4}"
elif [ ! -z "${FIND5}" ]; then
SHOWWARNING=1
Report "banner_os_disclosure[]=${FIND5}"
fi
if [ ${SHOWWARNING} -eq 1 ]; then
Display --indent 6 --text "- Postfix banner" --result "${STATUS_WARNING}" --color RED
LogText "Result: found OS, or mail_name in SMTP banner, and/or mail_name contains 'Postfix'."
ReportWarning ${TEST_NO} "Found some information disclosure in SMTP banner (OS or software name)"
ReportSuggestion ${TEST_NO} "You are advised to hide the mail_name (option: smtpd_banner) from your postfix configuration. Use postconf -e or change your main.cf file (${POSTFIX_CONFIGFILE})"
else
if IsVerbose; then Display --indent 6 --text "- Postfix banner" --result "${STATUS_OK}" --color GREEN; fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8820
Register --test-no MAIL-8820 --weight L --network NO --category security --description "Postfix configuration scan"
if [ ${SKIPTEST} -eq 0 ]; then
if [ "$(postconf -h inet_interfaces 2> /dev/null)" = "all" ]; then
if ! SkipAtomicTest "${TEST_NO}:disable_vrfy_command"; then
if [ "$(postconf -h disable_vrfy_command 2> /dev/null)" = "no" ]; then
ReportSuggestion "${TEST_NO}:disable_vrfy_command" "Disable the 'VRFY' command" "disable_vrfy_command=no" "text:run postconf -e disable_vrfy_command=yes to change the value"
fi
fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8838
# Description : Check Dovecot process
Register --test-no MAIL-8838 --weight L --network NO --category security --description "Check dovecot process"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: check dovecot status"
IsRunning dovecot
if [ ${RUNNING} -eq 1 ]; then
LogText "Result: found running dovecot process"
Display --indent 2 --text "- Dovecot status" --result "${STATUS_RUNNING}" --color GREEN
DOVECOT_RUNNING=1
IMAP_DAEMON="dovecot"
POP3_DAEMON="dovecot"
Report "pop3_daemon[]=dovecot"
Report "imap_daemon[]=dovecot"
else
LogText "Result: dovecot not found"
if IsVerbose; then Display --indent 2 --text "- Dovecot status" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8860
# Description : Check Qmail process status
Register --test-no MAIL-8860 --weight L --network NO --category security --description "Check Qmail status"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: check Qmail status"
IsRunning qmail-smtpd
if [ ${RUNNING} -eq 1 ]; then
LogText "Result: found running Qmail process"
Display --indent 2 --text "- Qmail status" --result "${STATUS_RUNNING}" --color GREEN
QMAIL_RUNNING=1
SMTP_DAEMON="qmail"
Report "smtp_daemon[]=qmail"
else
LogText "Result: no running Qmail processes found"
if IsVerbose; then Display --indent 2 --text "- Qmail status" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8880
# Description : Check Sendmail process status
Register --test-no MAIL-8880 --weight L --network NO --category security --description "Check Sendmail status"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: check sendmail status"
IsRunning sendmail
if [ ${RUNNING} -eq 1 ]; then
LogText "Result: found running Sendmail process"
Display --indent 2 --text "- Sendmail status" --result "${STATUS_RUNNING}" --color GREEN
SENDMAIL_RUNNING=1
SMTP_DAEMON="sendmail"
Report "smtp_daemon[]=sendmail"
else
LogText "Result: no running Sendmail processes found"
if IsVerbose; then Display --indent 2 --text "- Sendmail status" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
fi
fi
#
#################################################################################
#
# Test : MAIL-8920
# Description : Check OpenSMTPD process status
if [ ! -z "${SMTPCTLBINARY}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
Register --test-no MAIL-8920 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Check OpenSMTPD status"
if [ ${SKIPTEST} -eq 0 ]; then
LogText "Test: check smtpd status"
FIND=$(${PSBINARY} ax | ${EGREPBINARY} "(/smtpd|smtpd: \[priv\]|smtpd: smtp)" | ${GREPBINARY} -v "grep")
if [ ! "${FIND}" = "" ]; then
LogText "Result: found running smtpd process"
Display --indent 2 --text "- OpenSMTPD status" --result "${STATUS_RUNNING}" --color GREEN
OPENSMTPD_RUNNING=1
Report "smtp_daemon[]=opensmtpd"
else
LogText "Result: smtpd not found"
if IsVerbose; then Display --indent 2 --text "- OpenSMTPD status" --result "${STATUS_NOT_FOUND}" --color WHITE; fi
fi
fi
#
#################################################################################
#
Report "imap_daemon=${IMAP_DAEMON}"
Report "pop3_daemon=${POP3_DAEMON}"
Report "smtp_daemon=${SMTP_DAEMON}"
WaitForKeyPress
#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
|