blob: 1942af8a6eb239023ea0e4e1f4c16918efe000fd (
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
|
#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2013-2016, 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
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 exim
if [ ${RUNNING} -eq 1 ]; then
LogText "Result: found running Exim process"
Display --indent 2 --text "- Checking Exim status" --result "${STATUS_RUNNING}" --color GREEN
EXIM_RUNNING=1
SMTP_DAEMON="exim"
else
LogText "Result: no running Exim processes found"
Display --indent 2 --text "- Checking Exim status" --result "${STATUS_NOT_FOUND}" --color WHITE
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 "- Checking Postfix status" --result "${STATUS_RUNNING}" --color GREEN
POSTFIX_RUNNING=1
SMTP_DAEMON="postfix"
else
LogText "Result: no running Postfix processes found"
Display --indent 2 --text "- Checking Postfix status" --result "${STATUS_NOT_FOUND}" --color WHITE
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 [ ${SKIPTEST} -eq 0 ]; then
Display --indent 2 --text "- Checking Postfix configuration" --result "${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-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' | ${EGREPBINARY} -i "${OS}|${LINUX_VERSION}")
SHOWWARNING=0
if [ ! -z "${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}"
fi
if [ ${SHOWWARNING} -eq 1 ]; then
Display --indent 4 --text "- Postfix banner" --result "${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 4 --text "- Postfix banner" --result "${STATUS_OK}" --color GREEN; 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 [ ${RUNNING} -eq 1 ]; then
LogText "Result: found running dovecot process"
Display --indent 2 --text "- Checking Dovecot status" --result "${STATUS_RUNNING}" --color GREEN
DOVECOT_RUNNING=1
IMAP_DAEMON="dovecot"
POP3_DAEMON="dovecot"
else
LogText "Result: dovecot not found"
Display --indent 2 --text "- Checking Dovecot status" --result "${STATUS_NOT_FOUND}" --color WHITE
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 [ ${RUNNING} -eq 1 ]; then
LogText "Result: found running Qmail process"
Display --indent 2 --text "- Checking Qmail status" --result "${STATUS_RUNNING}" --color GREEN
QMAIL_RUNNING=1
SMTP_DAEMON="qmail"
else
LogText "Result: no running Qmail processes found"
Display --indent 2 --text "- Checking Qmail status" --result "${STATUS_NOT_FOUND}" --color WHITE
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 [ ${RUNNING} -eq 1 ]; then
LogText "Result: found running Sendmail process"
Display --indent 2 --text "- Checking Sendmail status" --result "${STATUS_RUNNING}" --color GREEN
SENDMAIL_RUNNING=1
SMTP_DAEMON="sendmail"
else
LogText "Result: no running Sendmail processes found"
Display --indent 2 --text "- Checking Sendmail status" --result "${STATUS_NOT_FOUND}" --color WHITE
fi
fi
#
#################################################################################
#
# Test : MAIL-8920
# Description : Check OpenSMTPD process status
if [ ! -z "${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 "- Checking OpenSMTPD status" --result "${STATUS_RUNNING}" --color GREEN
OPENSMTPD_RUNNING=1
SMTP_DAEMON="opensmtpd"
else
LogText "Result: smtpd not found"
Display --indent 2 --text "- Checking OpenSMTPD status" --result "${STATUS_NOT_FOUND}" --color WHITE
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
|