blob: 3c0885823f20bfac9e372c52632e1eea1a9d091a (
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
|
#!/bin/bash
#
# Written by Vandoorselaere Yoann, <yoann@mandrakesoft.com>
#
if [ -f /etc/security/msec/security.conf ]; then
. /etc/security/msec/security.conf
else
echo "/etc/security/msec/security.conf don't exist."
exit 1
fi
if [ "${CHECK_SECURITY}" == "no" ]; then
exit 0
fi
# Modified filters coming from debian security scripts.
CS_NFSAFS='(nfs|afs|xfs|coda)'
CS_TYPES=' type (devpts|auto|proc|msdos|fat|vfat|iso9660|ncpfs|smbfs|'$CS_NFSAFS')'
CS_DEVS='^/dev/fd'
CS_DIRS='on /mnt'
FILTERS="$CS_TYPES|$CS_DEVS|$CS_DIRS"
DIR=`mount | grep -vE "$FILTERS" | cut -d ' ' -f3`
###
SUID_ROOT_TODAY="/var/log/security/suid_root.today"
SUID_ROOT_YESTERDAY="/var/log/security/suid_root.yesterday"
SUID_ROOT_DIFF="/var/log/security/suid_root.diff"
SUID_GROUP_TODAY="/var/log/security/suid_group.today"
SUID_GROUP_YESTERDAY="/var/log/security/suid_group.yesterday"
SUID_GROUP_DIFF="/var/log/security/suid_group.diff"
SUID_MD5_TODAY="/var/log/security/suid_md5.today"
SUID_MD5_YESTERDAY="/var/log/security/suid_md5.yesterday"
SUID_MD5_DIFF="/var/log/security/suid_md5.diff"
OPEN_PORT_TODAY="/var/log/security/open_port.today"
OPEN_PORT_YESTERDAY="/var/log/security/open_port.yesterday"
OPEN_PORT_DIFF="/var/log/security/open_port.diff"
WRITEABLE_TODAY="/var/log/security/writeable.today"
WRITEABLE_YESTERDAY="/var/log/security/writeable.yesterday"
WRITEABLE_DIFF="/var/log/security/writeable.diff"
UNOWNED_TODAY="/var/log/security/unowned.today"
UNOWNED_YESTERDAY="/var/log/security/unowned.yesterday"
UNOWNED_DIFF="/var/log/security/unowned.diff"
SECURITY_LOG="/var/log/security.log"
TMP="/tmp/secure.tmp"
if [ ! -d /var/log/security ]; then
mkdir /var/log/security
fi
chattr -a /var/log/security/ >& /dev/null
chattr -a /var/log/security/* >& /dev/null
rm -f ${TMP} ${SECURITY_TMP} >& /dev/null
### Functions ###
Syslog() {
if [[ ${SYSLOG_WARN} == yes ]]; then
cat ${1} | while read line; do
/sbin/initlog --string="${line}"
done
fi
}
Ttylog() {
if [[ ${TTY_WARN} == yes ]]; then
for i in `w | grep -v "load\|TTY" | awk '{print $2}'` ; do
echo -e "$1" > /dev/$i
done
fi
}
##################
### New Suid root files detection
if [[ ${CHECK_SUID_ROOT} == yes ]]; then
if [ -f ${SUID_ROOT_TODAY} ]; then
mv ${SUID_ROOT_TODAY} ${SUID_ROOT_YESTERDAY}
fi
find ${DIR} -xdev -type f -perm +04000 -user root \
-printf "%8i %5m %3n %-10u %-10g %9s %t %h/%f\n" | sort > ${SUID_ROOT_TODAY}
if [ -f ${SUID_ROOT_YESTERDAY} ]; then
if ! diff -u ${SUID_ROOT_YESTERDAY} ${SUID_ROOT_TODAY} > ${SUID_ROOT_DIFF}; then
printf "\nSecurity Warning: Change in Suid Root files found :\n" >> ${TMP}
grep '^+' ${SUID_ROOT_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added suid root files : ${file}.\n" >> ${TMP}
done
grep '^-' ${SUID_ROOT_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed suid root files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### New Suid group files detection
if [ ${CHECK_SUID_GROUP} ]; then
if [ -f ${SUID_GROUP_TODAY} ]; then
mv ${SUID_GROUP_TODAY} ${SUID_GROUP_YESTERDAY}
fi
find ${DIR} -xdev -type f -perm +02000 \
-printf "%8i %5m %3n %-10u %-10g %9s %t %h/%f\n" | sort > ${SUID_GROUP_TODAY}
if [ -f ${SUID_GROUP_YESTERDAY} ]; then
if ! diff -u ${SUID_GROUP_YESTERDAY} ${SUID_GROUP_TODAY} > ${SUID_GROUP_DIFF}; then
printf "\nSecurity Warning: Changes in Suid Group files found :\n" >> ${TMP}
grep '^+' ${SUID_GROUP_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added suid group files : ${file}.\n" >> ${TMP}
done
grep '^-' ${SUID_GROUP_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed suid group files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### Writable files detection
if [[ ${CHECK_WRITEABLE} == yes ]]; then
if [ -f ${WRITEABLE_TODAY} ]; then
mv -f ${WRITEABLE_TODAY} ${WRITEABLE_YESTERDAY}
fi
find ${DIR} -xdev -type f -perm -2 -ls -print | sort > ${WRITEABLE_TODAY}
if [ -f ${WRITEABLE_YESTERDAY} ]; then
if ! diff -u ${WRITEABLE_YESTERDAY} ${WRITEABLE_TODAY} > ${WRITEABLE_DIFF}; then
printf "\nSecurity Warning: Change in World Writeable Files found :\n" >> ${TMP}
grep '^+' ${WRITEABLE_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added writables files : ${file}.\n" >> ${TMP}
done
grep '^-' ${WRITEABLE_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed writables files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### Search Non Owned files
if [[ ${CHECK_UNOWNED} == yes ]]; then
if [ -f ${UNOWNED_TODAY} ]; then
mv -f ${UNOWNED_TODAY} ${UNOWNED_YESTERDAY}
fi
find ${DIR} -xdev -nouser -print -ls | sort > ${UNOWNED_TODAY}
if [ -f ${UNOWNED_YESTERDAY} ]; then
if ! diff -u ${UNOWNED_YESTERDAY} ${UNOWNED_TODAY} > ${UNOWNED_DIFF}; then
printf "\nSecurity Warning: the following files aren't owned by an user :\n" >> ${TMP}
grep '^+' ${UNOWNED_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added un-owned files : ${file}.\n" >> ${TMP}
done
grep '^-' ${UNOWNED_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed un-owned files : ${file}.\n" >> ${TMP}
done
fi
fi
find ${DIR} -xdev -nogroup -print -ls | sort >> ${UNOWNED_TODAY}
if [ -f ${UNOWNED_YESTERDAY} ]; then
if ! diff -u ${UNOWNED_YESTERDAY} ${UNOWNED_TODAY} > ${UNOWNED_DIFF}; then
printf "\nSecurity Warning: the following files aren't owned by a group :\n" >> ${TMP}
grep '^+' ${UNOWNED_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added un-owned files : ${file}.\n" >> ${TMP}
done
grep '^-' ${UNOWNED_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed un-owned files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### Md5 check for SUID root file
if [[ ${CHECK_SUID_MD5} == yes ]]; then
if [ -f ${SUID_MD5_TODAY} ]; then
mv ${SUID_MD5_TODAY} ${SUID_MD5_YESTERDAY}
fi
touch ${SUID_MD5_TODAY}
awk '{print $12}' ${SUID_ROOT_TODAY} |
while read line; do
md5sum ${line} >> ${SUID_MD5_TODAY}
done
if [ -f ${SUID_MD5_YESTERDAY} ]; then
if ! diff -u ${SUID_MD5_YESTERDAY} ${SUID_MD5_TODAY} > ${SUID_MD5_DIFF}; then
printf "\nSecurity Warning: the md5 checksum for one of your SUID files has changed,\n" >> ${TMP}
printf "\tmaybe an intruder modified one of these suid binary in order to put in a backdoor...\n" >> ${TMP}
grep '^+' ${SUID_MD5_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $2}' | while read file; do
printf "\t\t- Changed ( added ) files : ${file}.\n" >> ${TMP}
done
grep '^-' ${SUID_MD5_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $2}' | while read file; do
printf "\t\t- Changed ( removed ) files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### Changed open port
if [[ ${CHECK_OPEN_PORT} == yes ]]; then
if [ -f ${OPEN_PORT_TODAY} ]; then
mv -f ${OPEN_PORT_TODAY} ${OPEN_PORT_YESTERDAY}
fi
netstat -pvlA inet > ${OPEN_PORT_TODAY};
if [ -f ${OPEN_PORT_YESTERDAY} ]; then
if ! diff -u ${OPEN_PORT_YESTERDAY} ${OPEN_PORT_TODAY} 1> ${OPEN_PORT_DIFF}; then
printf "\nSecurity Warning: There is a new port listening on your machine :\n" >> ${TMP}
grep '^+' ${OPEN_PORT_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Opened ports : ${file}.\n" >> ${TMP}
done
grep '^-' ${OPEN_PORT_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Closed ports : ${file}.\n" >> ${TMP}
done
fi
fi
fi
######## Report ######
if [ -s ${TMP} ]; then
Syslog ${TMP}
Ttylog ${TMP}
date=`date`
echo -e "\n\n*** Diff Check, ${date} ***\n" >> ${SECURITY_LOG}
cat ${TMP} >> ${SECURITY_LOG}
fi
if [ -f ${TMP} ]; then
rm -f ${TMP}
fi
|
