blob: 22b5e8e30b41098508bae4237603b1bd9550000a (
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
|
#!/bin/sh -
#
# @(#)security 5.3 (Berkeley) 5/28/91
# $FreeBSD$
#
PATH=/sbin:/bin:/usr/bin
LC_ALL=C; export LC_ALL
rc=0
LOG=/var/log
TMP=/var/run/_secure.$$
separator () {
echo ''
echo ''
}
catmsgs() {
[ -f $LOG/messages.0.gz ] && zcat $LOG/messages.0.gz
[ -f $LOG/messages.0 ] && cat $LOG/messages.0
[ -f $LOG/messages ] && cat $LOG/messages
}
sflag=FALSE ignore=
while getopts ams c
do
case "$c" in
a) ignore="$ignore|^amd:";;
m) ignore="$ignore|^mfs:";;
s) sflag=TRUE;;
esac
done
yesterday=`date -v-1d "+%b %e "`
host=`hostname`
[ $sflag = FALSE ] && echo "Subject: ${host} security check output"
umask 027
echo "checking setuid files and devices:"
# Don't have ncheck, but this does the equivalent of the commented out block.
# Note that one of the original problems, the possibility of overrunning
# the args to ls, is still here...
#
MP=`mount -t ufs | grep -v " nosuid" | awk '{ print $3 }' | sort`
set ${MP}
while [ $# -ge 1 ]; do
mount=$1
shift
find $mount -xdev -type f \
\( -perm -u+x -or -perm -g+x -or -perm -o+x \) \
\( -perm -u+s -or -perm -g+s \) -print0
done | xargs -0 -n 20 ls -liTd | sort +10 > ${TMP}
if [ ! -f ${LOG}/setuid.today ]; then
[ $rc -lt 1 ] && rc=1
separator
echo "no ${LOG}/setuid.today"
cp ${TMP} ${LOG}/setuid.today || rc=3
fi
if ! cmp ${LOG}/setuid.today ${TMP} >/dev/null; then
[ $rc -lt 1 ] && rc=1
separator
echo "${host} setuid diffs:"
diff -w ${LOG}/setuid.today ${TMP}
mv ${LOG}/setuid.today ${LOG}/setuid.yesterday || rc=3
mv ${TMP} ${LOG}/setuid.today || rc=3
fi
# Show changes in the way filesystems are mounted
#
[ -n "$ignore" ] && cmd="egrep -v ${ignore#|}" || cmd=cat
if mount -p | $cmd > $TMP; then
if [ ! -f $LOG/mount.today ]; then
[ $rc -lt 1 ] && rc=1
separator
echo "no $LOG/mount.today"
cp $TMP $LOG/mount.today || rc=3
fi
if ! cmp $LOG/mount.today $TMP >/dev/null 2>&1; then
[ $rc -lt 1 ] && rc=1
separator
echo "$host changes in mounted filesystems:"
diff -b $LOG/mount.today $TMP
mv $LOG/mount.today $LOG/mount.yesterday || rc=3
mv $TMP $LOG/mount.today || rc=3
fi
fi
separator
echo "checking for uids of 0:"
n=$(awk -F: '$3==0 {print $1,$3}' /etc/master.passwd |
tee /dev/stderr |
sed -e '/^root 0$/d' -e '/^toor 0$/d' |
wc -l)
[ $n -gt 0 -a $rc -lt 1 ] && rc=1
separator
echo "checking for passwordless accounts:"
n=$(awk -F: 'NF > 1 && $1 !~ /^[#+-]/ && $2=="" {print $0}' /etc/master.passwd |
tee /dev/stderr | wc -l)
[ $n -gt 0 -a $rc -lt 1 ] && rc=1
# Show denied packets
#
if ipfw -a l 2>/dev/null | egrep "deny|reset|unreach" > ${TMP}; then
if [ ! -f ${LOG}/ipfw.today ]; then
[ $rc -lt 1 ] && rc=1
separator
echo "no ${LOG}/ipfw.today"
cp ${TMP} ${LOG}/ipfw.today || rc=3
fi
if ! cmp ${LOG}/ipfw.today ${TMP} >/dev/null; then
[ $rc -lt 1 ] && rc=1
separator
echo "${host} denied packets:"
diff -b ${LOG}/ipfw.today ${TMP} | egrep "^>"
mv ${LOG}/ipfw.today ${LOG}/ipfw.yesterday || rc=3
mv ${TMP} ${LOG}/ipfw.today || rc=3
fi
fi
# Show ipfw rules which have reached the log limit
#
IPFW_LOG_LIMIT=`sysctl -n net.inet.ip.fw.verbose_limit 2> /dev/null`
if [ $? -eq 0 -a "${IPFW_LOG_LIMIT}" -ne 0 ]; then
ipfw -a l | grep " log " | perl -n -e \
'/^\d+\s+(\d+)/; print if ($1 >= '$IPFW_LOG_LIMIT')' > ${TMP}
if [ -s "${TMP}" ]; then
[ $rc -lt 1 ] && rc=1
separator
echo "ipfw log limit reached:"
cat ${TMP}
fi
fi
# Show kernel log messages
#
if dmesg 2>/dev/null > ${TMP}; then
if [ ! -f ${LOG}/dmesg.today ]; then
[ $rc -lt 1 ] && rc=1
separator
echo "no ${LOG}/dmesg.today"
cp ${TMP} ${LOG}/dmesg.today || rc=3
fi
if ! cmp ${LOG}/dmesg.today ${TMP} >/dev/null 2>&1; then
[ $rc -lt 1 ] && rc=1
separator
echo "${host} kernel log messages:"
diff -b ${LOG}/dmesg.today ${TMP} | egrep "^>"
mv ${LOG}/dmesg.today ${LOG}/dmesg.yesterday || rc=3
mv ${TMP} ${LOG}/dmesg.today || rc=3
fi
fi
# Show login failures
#
separator
echo "${host} login failures:"
n=$(catmsgs | grep -i "^$yesterday.*login failure" | tee /dev/stderr | wc -l)
[ $n -gt 0 -a $rc -lt 1 ] && rc=1
# Show tcp_wrapper warning messages
#
separator
echo "${host} refused connections:"
n=$(catmsgs | grep -i "^$yesterday.*refused connect" | tee /dev/stderr | wc -l)
[ $n -gt 0 -a $rc -lt 1 ] && rc=1
rm -f ${TMP}
exit $rc
|