blob: 8ecead4ccad0c3bc0764e69b9e2e797ee4cb7ebd (
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
|
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
set -e
set -u
set -o pipefail
IMA_POLICY_FILE="/sys/kernel/security/ima/policy"
TEST_BINARY="/bin/true"
VERBOSE="${SELFTESTS_VERBOSE:=0}"
LOG_FILE="$(mktemp /tmp/ima_setup.XXXX.log)"
usage()
{
echo "Usage: $0 <setup|cleanup|run|modify-bin|restore-bin|load-policy> <existing_tmp_dir>"
exit 1
}
ensure_mount_securityfs()
{
local securityfs_dir=$(grep "securityfs" /proc/mounts | awk '{print $2}')
if [ -z "${securityfs_dir}" ]; then
securityfs_dir=/sys/kernel/security
mount -t securityfs security "${securityfs_dir}"
fi
if [ ! -d "${securityfs_dir}" ]; then
echo "${securityfs_dir}: securityfs is not mounted" && exit 1
fi
}
setup()
{
local tmp_dir="$1"
local mount_img="${tmp_dir}/test.img"
local mount_dir="${tmp_dir}/mnt"
local copied_bin_path="${mount_dir}/$(basename ${TEST_BINARY})"
mkdir -p ${mount_dir}
dd if=/dev/zero of="${mount_img}" bs=1M count=10
losetup -f "${mount_img}"
local loop_device=$(losetup -a | grep ${mount_img:?} | cut -d ":" -f1)
mkfs.ext2 "${loop_device:?}"
mount "${loop_device}" "${mount_dir}"
cp "${TEST_BINARY}" "${mount_dir}"
local mount_uuid="$(blkid ${loop_device} | sed 's/.*UUID="\([^"]*\)".*/\1/')"
ensure_mount_securityfs
echo "measure func=BPRM_CHECK fsuuid=${mount_uuid}" > ${IMA_POLICY_FILE}
echo "measure func=BPRM_CHECK fsuuid=${mount_uuid}" > ${mount_dir}/policy_test
}
cleanup() {
local tmp_dir="$1"
local mount_img="${tmp_dir}/test.img"
local mount_dir="${tmp_dir}/mnt"
local loop_devices=$(losetup -a | grep ${mount_img:?} | cut -d ":" -f1)
for loop_dev in "${loop_devices}"; do
losetup -d $loop_dev
done
umount ${mount_dir}
rm -rf ${tmp_dir}
}
run()
{
local tmp_dir="$1"
local mount_dir="${tmp_dir}/mnt"
local copied_bin_path="${mount_dir}/$(basename ${TEST_BINARY})"
exec "${copied_bin_path}"
}
modify_bin()
{
local tmp_dir="$1"
local mount_dir="${tmp_dir}/mnt"
local copied_bin_path="${mount_dir}/$(basename ${TEST_BINARY})"
echo "mod" >> "${copied_bin_path}"
}
restore_bin()
{
local tmp_dir="$1"
local mount_dir="${tmp_dir}/mnt"
local copied_bin_path="${mount_dir}/$(basename ${TEST_BINARY})"
truncate -s -4 "${copied_bin_path}"
}
load_policy()
{
local tmp_dir="$1"
local mount_dir="${tmp_dir}/mnt"
echo ${mount_dir}/policy_test > ${IMA_POLICY_FILE} 2> /dev/null
}
catch()
{
local exit_code="$1"
local log_file="$2"
if [[ "${exit_code}" -ne 0 ]]; then
cat "${log_file}" >&3
fi
rm -f "${log_file}"
exit ${exit_code}
}
main()
{
[[ $# -ne 2 ]] && usage
local action="$1"
local tmp_dir="$2"
[[ ! -d "${tmp_dir}" ]] && echo "Directory ${tmp_dir} doesn't exist" && exit 1
if [[ "${action}" == "setup" ]]; then
setup "${tmp_dir}"
elif [[ "${action}" == "cleanup" ]]; then
cleanup "${tmp_dir}"
elif [[ "${action}" == "run" ]]; then
run "${tmp_dir}"
elif [[ "${action}" == "modify-bin" ]]; then
modify_bin "${tmp_dir}"
elif [[ "${action}" == "restore-bin" ]]; then
restore_bin "${tmp_dir}"
elif [[ "${action}" == "load-policy" ]]; then
load_policy "${tmp_dir}"
else
echo "Unknown action: ${action}"
exit 1
fi
}
trap 'catch "$?" "${LOG_FILE}"' EXIT
if [[ "${VERBOSE}" -eq 0 ]]; then
# Save the stderr to 3 so that we can output back to
# it incase of an error.
exec 3>&2 1>"${LOG_FILE}" 2>&1
fi
main "$@"
rm -f "${LOG_FILE}"
|
