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
|
# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::PathTraversal, feature_category: :shared do
using RSpec::Parameterized::TableSyntax
delegate :check_path_traversal!, :check_allowed_absolute_path!,
:check_allowed_absolute_path_and_path_traversal!, to: :described_class
describe '.check_path_traversal!' do
it 'detects path traversal in string without any separators' do
expect { check_path_traversal!('.') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('..') }.to raise_error(/Invalid path/)
end
it 'detects path traversal at the start of the string' do
expect { check_path_traversal!('../foo') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('..\\foo') }.to raise_error(/Invalid path/)
end
it 'detects path traversal at the start of the string, even to just the subdirectory' do
expect { check_path_traversal!('../') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('..\\') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('/../') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('\\..\\') }.to raise_error(/Invalid path/)
end
it 'detects path traversal in the middle of the string' do
expect { check_path_traversal!('foo/../../bar') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('foo\\..\\..\\bar') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('foo/..\\bar') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('foo\\../bar') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('foo/..\\..\\..\\..\\../bar') }.to raise_error(/Invalid path/)
end
it 'detects path traversal at the end of the string when slash-terminates' do
expect { check_path_traversal!('foo/../') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('foo\\..\\') }.to raise_error(/Invalid path/)
end
it 'detects path traversal at the end of the string' do
expect { check_path_traversal!('foo/..') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('foo\\..') }.to raise_error(/Invalid path/)
end
it 'detects path traversal in string with encoded chars' do
expect { check_path_traversal!('foo%2F..%2Fbar') }.to raise_error(/Invalid path/)
expect { check_path_traversal!('foo%2F%2E%2E%2Fbar') }.to raise_error(/Invalid path/)
end
it 'detects double encoded chars' do
expect { check_path_traversal!('foo%252F..%2Fbar') }
.to raise_error(Gitlab::Utils::DoubleEncodingError, /is not allowed/)
expect { check_path_traversal!('foo%252F%2E%2E%2Fbar') }
.to raise_error(Gitlab::Utils::DoubleEncodingError, /is not allowed/)
end
it 'does nothing for a safe string' do
expect(check_path_traversal!('./foo')).to eq('./foo')
expect(check_path_traversal!('.test/foo')).to eq('.test/foo')
expect(check_path_traversal!('..test/foo')).to eq('..test/foo')
expect(check_path_traversal!('dir/..foo.rb')).to eq('dir/..foo.rb')
expect(check_path_traversal!('dir/.foo.rb')).to eq('dir/.foo.rb')
end
it 'logs potential path traversal attempts' do
expect(Gitlab::AppLogger).to receive(:warn)
.with(message: "Potential path traversal attempt detected", path: "..")
expect { check_path_traversal!('..') }.to raise_error(/Invalid path/)
end
it 'logs does nothing for a safe string' do
expect(Gitlab::AppLogger).not_to receive(:warn)
.with(message: "Potential path traversal attempt detected", path: "dir/.foo.rb")
expect(check_path_traversal!('dir/.foo.rb')).to eq('dir/.foo.rb')
end
it 'does nothing for nil' do
expect(check_path_traversal!(nil)).to be_nil
end
it 'does nothing for safe HashedPath' do
expect(check_path_traversal!(Gitlab::HashedPath.new('tmp', root_hash: 1)))
.to eq '6b/86/6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b/tmp'
end
it 'raises for unsafe HashedPath' do
expect { check_path_traversal!(Gitlab::HashedPath.new('tmp', '..', 'etc', 'passwd', root_hash: 1)) }
.to raise_error(/Invalid path/)
end
it 'raises for other non-strings' do
expect { check_path_traversal!(%w[/tmp /tmp/../etc/passwd]) }.to raise_error(/Invalid path/)
end
context 'when skip_decoding is used' do
it 'does not detect double encoded chars' do
expect(check_path_traversal!('foo%252F..%2Fbar', skip_decoding: true)).to eq('foo%252F..%2Fbar')
expect(check_path_traversal!('foo%252F%2E%2E%2Fbar', skip_decoding: true)).to eq('foo%252F%2E%2E%2Fbar')
end
end
end
describe '.check_allowed_absolute_path!' do
let(:allowed_paths) { ['/home/foo'] }
it 'raises an exception if an absolute path is not allowed' do
expect { check_allowed_absolute_path!('/etc/passwd', allowed_paths) }.to raise_error(StandardError)
end
it 'does nothing for an allowed absolute path' do
expect(check_allowed_absolute_path!('/home/foo', allowed_paths)).to be_nil
end
end
describe '.check_allowed_absolute_path_and_path_traversal!' do
let(:allowed_paths) { %w[/home/foo ./foo .test/foo ..test/foo dir/..foo.rb dir/.foo.rb] }
it 'detects path traversal in string without any separators' do
expect { check_allowed_absolute_path_and_path_traversal!('.', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('..', allowed_paths) }
.to raise_error(/Invalid path/)
end
it 'detects path traversal at the start of the string' do
expect { check_allowed_absolute_path_and_path_traversal!('../foo', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('..\\foo', allowed_paths) }
.to raise_error(/Invalid path/)
end
it 'detects path traversal at the start of the string, even to just the subdirectory' do
expect { check_allowed_absolute_path_and_path_traversal!('../', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('..\\', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('/../', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('\\..\\', allowed_paths) }
.to raise_error(/Invalid path/)
end
it 'detects path traversal in the middle of the string' do
expect { check_allowed_absolute_path_and_path_traversal!('foo/../../bar', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('foo\\..\\..\\bar', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('foo/..\\bar', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('foo\\../bar', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('foo/..\\..\\..\\..\\../bar', allowed_paths) }
.to raise_error(/Invalid path/)
end
it 'detects path traversal at the end of the string when slash-terminates' do
expect { check_allowed_absolute_path_and_path_traversal!('foo/../', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('foo\\..\\', allowed_paths) }
.to raise_error(/Invalid path/)
end
it 'detects path traversal at the end of the string' do
expect { check_allowed_absolute_path_and_path_traversal!('foo/..', allowed_paths) }
.to raise_error(/Invalid path/)
expect { check_allowed_absolute_path_and_path_traversal!('foo\\..', allowed_paths) }
.to raise_error(/Invalid path/)
end
it 'does not return errors for a safe string' do
expect(check_allowed_absolute_path_and_path_traversal!('./foo', allowed_paths)).to be_nil
expect(check_allowed_absolute_path_and_path_traversal!('.test/foo', allowed_paths)).to be_nil
expect(check_allowed_absolute_path_and_path_traversal!('..test/foo', allowed_paths)).to be_nil
expect(check_allowed_absolute_path_and_path_traversal!('dir/..foo.rb', allowed_paths)).to be_nil
expect(check_allowed_absolute_path_and_path_traversal!('dir/.foo.rb', allowed_paths)).to be_nil
end
it 'raises error for a non-string' do
expect { check_allowed_absolute_path_and_path_traversal!(nil, allowed_paths) }.to raise_error(StandardError)
end
it 'raises an exception if an absolute path is not allowed' do
expect { check_allowed_absolute_path!('/etc/passwd', allowed_paths) }.to raise_error(StandardError)
end
it 'does nothing for an allowed absolute path' do
expect(check_allowed_absolute_path!('/home/foo', allowed_paths)).to be_nil
end
end
end
|