blob: 9343d1615423c3cbd44adf3540148c30064a05ce (
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
|
#!/usr/bin/env bash
# COPYRIGHT NOTICE STARTS HERE
#
# Copyright 2019 Samsung Electronics Co., Ltd.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# COPYRIGHT NOTICE ENDS HERE
# Check all ports exposed by pods to internal network and look for
# open JDWP ports
#
# Dependencies:
# kubectl + config
# netcat
#
# Return value: Number of discovered JDWP ports
# Output: List of pods and exposing JDWP interface
#
usage() {
cat <<EOF
Usage: $(basename $0) <k8s-namespace> [-l <white list file>]
-l: jdpw white list ports file
EOF
exit ${1:-0}
}
if [ "$#" -lt 1 ]; then
usage
exit 1
fi
K8S_NAMESPACE=$1
LOCAL_PORT=12543
FILTERED_PORTS_LIST=$(mktemp jdpw_ports_XXXXXX)
WL_RAW_FILE_PATH=$(mktemp raw_filtered_ports_XXXXXX)
manage_white_list() {
# init filtered port list file
if [ ! -f $WL_FILE_PATH ];then
echo "File not found"
usage
fi
grep -o '^[^#]*' $WL_FILE_PATH > $WL_RAW_FILE_PATH
}
### getopts
while :
do
case $2 in
-h|--help|help) usage;;
-l) WL_FILE_PATH=$3;manage_white_list;shift;;
-*) usage 1 ;;
*) break ;;
esac
done
list_pods() {
kubectl get po --namespace=$K8S_NAMESPACE | grep Running | awk '{print $1}' | grep -v NAME
}
do_jdwp_handshake() {
local ip="127.0.0.1"
local port=$1
local jdwp_challenge="JDWP-Handshake\n"
local jdwp_response="JDWP-Handshake"
# 10s timeout to avoid hangs when service doesn't answer at all
local response=`nc -w 10 $ip $port <<<$jdwp_challenge | tr '\0' '\n'`
local n_response_lines=`echo "$response" | wc -l`
if [[ "$n_response_lines" -le 1 ]] && [[ $response == *"$jdwp_response"* ]]; then
return 0
fi
return 1
}
# get open ports from procfs as netstat is not always available
get_open_ports_on_pod() {
local pod=$1
local open_ports_hex=`kubectl exec --namespace=$K8S_NAMESPACE $pod cat /proc/net/tcp 2>/dev/null| grep -v "local_address" | awk '{ print $2" "$4 }' | grep '0A$' | tr ":" " " | awk '{ print $2 }' | sort | uniq`
for hex_port in $open_ports_hex; do
echo $((16#$hex_port))
done
}
N_PORTS=0
# go through all pods
for pod in `list_pods`; do
open_ports=`get_open_ports_on_pod $pod`
# if there is no open ports just go to next pod
if [ -z "$open_ports" ]; then
continue
fi
# let's setup a proxy and check every open port
for port in $open_ports; do
# run proxy
kubectl port-forward --namespace=$K8S_NAMESPACE $pod $LOCAL_PORT:$port &>/dev/null &
sleep 1
proxy_pid=$!
do_jdwp_handshake $LOCAL_PORT
if [ $? -eq 0 ]; then
echo $pod $port | tee $FILTERED_PORTS_LIST
((++N_PORTS))
fi
kill $proxy_pid 2>/dev/null
wait $proxy_pid 2>/dev/null
done
done
while IFS= read -r line; do
# for each line we test if it is in the white list with a regular expression
while IFS= read -r wl_line; do
wl_name=$(echo $wl_line | awk {'print $1'})
wl_port=$(echo $wl_line | awk {'print $2'})
if grep -e $wl_name.*$wl_port <<< "$line";then
# Found in white list, exclude it
sed -i "/$line/d" $FILTERED_PORTS_LIST
fi
done < $WL_RAW_FILE_PATH
done < $FILTERED_PORTS_LIST
N_FILTERED_PORTS_LIST=$(cat $FILTERED_PORTS_LIST |wc -l)
echo "------------------------------------"
echo "Nb error pod(s): $N_FILTERED_PORTS_LIST"
cat $FILTERED_PORTS_LIST
exit $N_FILTERED_PORTS_LIST
|
