/src/kea-fuzzer/fuzz_encode.cc
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1 | | // Copyright (C) 2025 Ada Logics Ltd. |
2 | | // |
3 | | // This Source Code Form is subject to the terms of the Mozilla Public |
4 | | // License, v. 2.0. If a copy of the MPL was not distributed with this |
5 | | // file, You can obtain one at http://mozilla.org/MPL/2.0/. |
6 | | //////////////////////////////////////////////////////////////////////////////// |
7 | | #include <config.h> |
8 | | #include <fuzzer/FuzzedDataProvider.h> |
9 | | |
10 | | #include <exceptions/exceptions.h> |
11 | | #include <util/encode/encode.h> |
12 | | |
13 | | #include <string> |
14 | | #include <vector> |
15 | | #include <cstddef> |
16 | | |
17 | | using namespace isc::util::encode; |
18 | | |
19 | 1.34k | extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) { |
20 | 1.34k | if (size < 2) { |
21 | 1 | return 0; |
22 | 1 | } |
23 | | |
24 | 1.34k | FuzzedDataProvider fdp(data, size); |
25 | | |
26 | | // Choose which encoding/decoding path to test |
27 | 1.34k | uint8_t path = fdp.ConsumeIntegralInRange<uint8_t>(0, 11); |
28 | | |
29 | 1.34k | std::vector<uint8_t> binary_data; |
30 | 1.34k | std::string encoded_str; |
31 | 1.34k | std::vector<uint8_t> decoded_output; |
32 | | |
33 | 1.34k | switch (path) { |
34 | 121 | case 0: { |
35 | | // Test Base64 encoding from binary data |
36 | 121 | try { |
37 | 121 | size_t bin_size = fdp.ConsumeIntegralInRange<size_t>(0, size); |
38 | 121 | binary_data = fdp.ConsumeBytes<uint8_t>(bin_size); |
39 | 121 | encoded_str = encodeBase64(binary_data); |
40 | | // Verify round-trip |
41 | 121 | decodeBase64(encoded_str, decoded_output); |
42 | 121 | } catch (const isc::Exception&) { |
43 | | // Expected for invalid input |
44 | 0 | } |
45 | 121 | break; |
46 | 121 | } |
47 | | |
48 | 102 | case 1: { |
49 | | // Test Base64 decoding from string |
50 | 102 | try { |
51 | 102 | encoded_str = fdp.ConsumeRemainingBytesAsString(); |
52 | 102 | decodeBase64(encoded_str, decoded_output); |
53 | 102 | } catch (const isc::Exception&) { |
54 | | // Expected for invalid Base64 strings |
55 | 100 | } |
56 | 102 | break; |
57 | 102 | } |
58 | | |
59 | 95 | case 2: { |
60 | | // Test Base32Hex encoding from binary data |
61 | 95 | try { |
62 | 95 | size_t bin_size = fdp.ConsumeIntegralInRange<size_t>(0, size); |
63 | 95 | binary_data = fdp.ConsumeBytes<uint8_t>(bin_size); |
64 | 95 | encoded_str = encodeBase32Hex(binary_data); |
65 | | // Verify round-trip |
66 | 95 | decodeBase32Hex(encoded_str, decoded_output); |
67 | 95 | } catch (const isc::Exception&) { |
68 | | // Expected for invalid input |
69 | 0 | } |
70 | 95 | break; |
71 | 95 | } |
72 | | |
73 | 72 | case 3: { |
74 | | // Test Base32Hex decoding from string |
75 | 72 | try { |
76 | 72 | encoded_str = fdp.ConsumeRemainingBytesAsString(); |
77 | 72 | decodeBase32Hex(encoded_str, decoded_output); |
78 | 72 | } catch (const isc::Exception&) { |
79 | | // Expected for invalid Base32Hex strings |
80 | 70 | } |
81 | 72 | break; |
82 | 72 | } |
83 | | |
84 | 109 | case 4: { |
85 | | // Test Base16 (hex) encoding from binary data |
86 | 109 | try { |
87 | 109 | size_t bin_size = fdp.ConsumeIntegralInRange<size_t>(0, size); |
88 | 109 | binary_data = fdp.ConsumeBytes<uint8_t>(bin_size); |
89 | 109 | encoded_str = encodeHex(binary_data); |
90 | | // Verify round-trip |
91 | 109 | decodeHex(encoded_str, decoded_output); |
92 | 109 | } catch (const isc::Exception&) { |
93 | | // Expected for invalid input |
94 | 0 | } |
95 | 109 | break; |
96 | 109 | } |
97 | | |
98 | 63 | case 5: { |
99 | | // Test Base16 (hex) decoding from string |
100 | 63 | try { |
101 | 63 | encoded_str = fdp.ConsumeRemainingBytesAsString(); |
102 | 63 | decodeHex(encoded_str, decoded_output); |
103 | 63 | } catch (const isc::Exception&) { |
104 | | // Expected for invalid hex strings |
105 | 61 | } |
106 | 63 | break; |
107 | 63 | } |
108 | | |
109 | 142 | case 6: { |
110 | | // Test Base64 with various padding scenarios |
111 | 142 | try { |
112 | 142 | std::string test_str = fdp.ConsumeRandomLengthString(); |
113 | | // Add various padding permutations |
114 | 142 | test_str += fdp.ConsumeBool() ? "=" : ""; |
115 | 142 | test_str += fdp.ConsumeBool() ? "=" : ""; |
116 | 142 | decodeBase64(test_str, decoded_output); |
117 | 142 | } catch (const isc::Exception&) { |
118 | | // Expected for invalid padding |
119 | 100 | } |
120 | 142 | break; |
121 | 142 | } |
122 | | |
123 | 133 | case 7: { |
124 | | // Test Base32Hex with various padding scenarios |
125 | 133 | try { |
126 | 133 | std::string test_str = fdp.ConsumeRandomLengthString(); |
127 | | // Add various padding permutations |
128 | 238 | for (int i = 0; i < fdp.ConsumeIntegralInRange(0, 6); i++) { |
129 | 105 | test_str += "="; |
130 | 105 | } |
131 | 133 | decodeBase32Hex(test_str, decoded_output); |
132 | 133 | } catch (const isc::Exception&) { |
133 | | // Expected for invalid padding |
134 | 112 | } |
135 | 133 | break; |
136 | 133 | } |
137 | | |
138 | 68 | case 8: { |
139 | | // Test mixed case Base64 (should be case-sensitive) |
140 | 68 | try { |
141 | 68 | encoded_str = fdp.ConsumeRemainingBytesAsString(); |
142 | | // Mix uppercase and lowercase |
143 | 8.73M | for (auto& c : encoded_str) { |
144 | 8.73M | if (fdp.ConsumeBool() && isalpha(c)) { |
145 | 0 | c = (isupper(c)) ? tolower(c) : toupper(c); |
146 | 0 | } |
147 | 8.73M | } |
148 | 68 | decodeBase64(encoded_str, decoded_output); |
149 | 68 | } catch (const isc::Exception&) { |
150 | | // Expected for case errors |
151 | 67 | } |
152 | 68 | break; |
153 | 68 | } |
154 | | |
155 | 67 | case 9: { |
156 | | // Test mixed case Base32Hex (case-insensitive) |
157 | 67 | try { |
158 | 67 | encoded_str = fdp.ConsumeRemainingBytesAsString(); |
159 | | // Mix uppercase and lowercase |
160 | 7.01M | for (auto& c : encoded_str) { |
161 | 7.01M | if (fdp.ConsumeBool() && isalpha(c)) { |
162 | 0 | c = (isupper(c)) ? tolower(c) : toupper(c); |
163 | 0 | } |
164 | 7.01M | } |
165 | 67 | decodeBase32Hex(encoded_str, decoded_output); |
166 | 67 | } catch (const isc::Exception&) { |
167 | | // May succeed due to case-insensitivity |
168 | 66 | } |
169 | 67 | break; |
170 | 67 | } |
171 | | |
172 | 66 | case 10: { |
173 | | // Test Base16 with mixed case (case-insensitive) |
174 | 66 | try { |
175 | 66 | encoded_str = fdp.ConsumeRemainingBytesAsString(); |
176 | | // Mix uppercase and lowercase |
177 | 7.43M | for (auto& c : encoded_str) { |
178 | 7.43M | if (fdp.ConsumeBool() && isalpha(c)) { |
179 | 0 | c = (isupper(c)) ? tolower(c) : toupper(c); |
180 | 0 | } |
181 | 7.43M | } |
182 | 66 | decodeHex(encoded_str, decoded_output); |
183 | 66 | } catch (const isc::Exception&) { |
184 | | // May succeed due to case-insensitivity |
185 | 64 | } |
186 | 66 | break; |
187 | 66 | } |
188 | | |
189 | 309 | case 11: { |
190 | | // Test encoding/decoding with whitespace injection |
191 | 309 | try { |
192 | 309 | std::string test_str = fdp.ConsumeRandomLengthString(); |
193 | | // Inject whitespace characters |
194 | 309 | size_t insertions = fdp.ConsumeIntegralInRange<size_t>(0, 10); |
195 | 1.34k | for (size_t i = 0; i < insertions && test_str.size() > 0; i++) { |
196 | 1.03k | size_t pos = fdp.ConsumeIntegralInRange<size_t>(0, test_str.size()); |
197 | 1.03k | char ws = fdp.PickValueInArray({' ', '\t', '\n', '\r'}); |
198 | 1.03k | test_str.insert(pos, 1, ws); |
199 | 1.03k | } |
200 | | |
201 | | // Try decoding with all encoders |
202 | 309 | try { decodeBase64(test_str, decoded_output); } catch (...) {} |
203 | 309 | try { decodeBase32Hex(test_str, decoded_output); } catch (...) {} |
204 | 309 | try { decodeHex(test_str, decoded_output); } catch (...) {} |
205 | 309 | } catch (const isc::Exception&) { |
206 | | // Expected for whitespace handling |
207 | 0 | } |
208 | 309 | break; |
209 | 309 | } |
210 | 1.34k | } |
211 | | |
212 | 1.34k | return 0; |
213 | 1.34k | } |