1 /* $OpenBSD: test_sshbuf_getput_crypto.c,v 1.3 2021/12/14 21:25:27 deraadt Exp $ */
2 /*
3 * Regress test for sshbuf.h buffer API
4 *
5 * Placed in the public domain
6 */
7
8 #include <sys/types.h>
9 #include <stdio.h>
10 #include <stdint.h>
11 #include <stdlib.h>
12 #include <string.h>
13
14 #include <openssl/bn.h>
15 #include <openssl/ec.h>
16 #include <openssl/objects.h>
17
18 #include "test_helper.h"
19 #include "ssherr.h"
20 #include "sshbuf.h"
21
22 void sshbuf_getput_crypto_tests(void);
23
24 void
sshbuf_getput_crypto_tests(void)25 sshbuf_getput_crypto_tests(void)
26 {
27 struct sshbuf *p1;
28 const u_char *d;
29 size_t s;
30 BIGNUM *bn, *bn2, *bn_x, *bn_y;
31 const char *hexbn1 = "0102030405060708090a0b0c0d0e0f10";
32 /* This one has MSB set to test bignum2 encoding negative-avoidance */
33 const char *hexbn2 = "f0e0d0c0b0a0908070605040302010007fff11";
34 u_char expbn1[] = {
35 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
36 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
37 };
38 u_char expbn2[] = {
39 0xf0, 0xe0, 0xd0, 0xc0, 0xb0, 0xa0, 0x90, 0x80,
40 0x70, 0x60, 0x50, 0x40, 0x30, 0x20, 0x10, 0x00,
41 0x7f, 0xff, 0x11
42 };
43 int ec256_nid = NID_X9_62_prime256v1;
44 char *ec256_x = "0C828004839D0106AA59575216191357"
45 "34B451459DADB586677EF9DF55784999";
46 char *ec256_y = "4D196B50F0B4E94B3C73E3A9D4CD9DF2"
47 "C8F9A35E42BDD047550F69D80EC23CD4";
48 u_char expec256[] = {
49 0x04,
50 0x0c, 0x82, 0x80, 0x04, 0x83, 0x9d, 0x01, 0x06,
51 0xaa, 0x59, 0x57, 0x52, 0x16, 0x19, 0x13, 0x57,
52 0x34, 0xb4, 0x51, 0x45, 0x9d, 0xad, 0xb5, 0x86,
53 0x67, 0x7e, 0xf9, 0xdf, 0x55, 0x78, 0x49, 0x99,
54 0x4d, 0x19, 0x6b, 0x50, 0xf0, 0xb4, 0xe9, 0x4b,
55 0x3c, 0x73, 0xe3, 0xa9, 0xd4, 0xcd, 0x9d, 0xf2,
56 0xc8, 0xf9, 0xa3, 0x5e, 0x42, 0xbd, 0xd0, 0x47,
57 0x55, 0x0f, 0x69, 0xd8, 0x0e, 0xc2, 0x3c, 0xd4
58 };
59 EC_KEY *eck;
60 EC_POINT *ecp;
61 int r;
62
63 #define MKBN(b, bnn) \
64 do { \
65 bnn = NULL; \
66 ASSERT_INT_GT(BN_hex2bn(&bnn, b), 0); \
67 } while (0)
68
69 TEST_START("sshbuf_put_bignum2");
70 MKBN(hexbn1, bn);
71 p1 = sshbuf_new();
72 ASSERT_PTR_NE(p1, NULL);
73 ASSERT_INT_EQ(sshbuf_put_bignum2(p1, bn), 0);
74 ASSERT_SIZE_T_EQ(sshbuf_len(p1), sizeof(expbn1) + 4);
75 ASSERT_U32_EQ(PEEK_U32(sshbuf_ptr(p1)), (u_int32_t)BN_num_bytes(bn));
76 ASSERT_MEM_EQ(sshbuf_ptr(p1) + 4, expbn1, sizeof(expbn1));
77 BN_free(bn);
78 sshbuf_free(p1);
79 TEST_DONE();
80
81 TEST_START("sshbuf_put_bignum2 limited");
82 MKBN(hexbn1, bn);
83 p1 = sshbuf_new();
84 ASSERT_PTR_NE(p1, NULL);
85 ASSERT_INT_EQ(sshbuf_set_max_size(p1, sizeof(expbn1) + 3), 0);
86 r = sshbuf_put_bignum2(p1, bn);
87 ASSERT_INT_EQ(r, SSH_ERR_NO_BUFFER_SPACE);
88 ASSERT_SIZE_T_EQ(sshbuf_len(p1), 0);
89 BN_free(bn);
90 sshbuf_free(p1);
91 TEST_DONE();
92
93 TEST_START("sshbuf_put_bignum2 bn2");
94 MKBN(hexbn2, bn);
95 p1 = sshbuf_new();
96 ASSERT_PTR_NE(p1, NULL);
97 ASSERT_INT_EQ(sshbuf_put_bignum2(p1, bn), 0);
98 ASSERT_SIZE_T_EQ(sshbuf_len(p1), sizeof(expbn2) + 4 + 1); /* MSB */
99 ASSERT_U32_EQ(PEEK_U32(sshbuf_ptr(p1)), (u_int32_t)BN_num_bytes(bn) + 1);
100 ASSERT_U8_EQ(*(sshbuf_ptr(p1) + 4), 0x00);
101 ASSERT_MEM_EQ(sshbuf_ptr(p1) + 5, expbn2, sizeof(expbn2));
102 BN_free(bn);
103 sshbuf_free(p1);
104 TEST_DONE();
105
106 TEST_START("sshbuf_put_bignum2 bn2 limited");
107 MKBN(hexbn2, bn);
108 p1 = sshbuf_new();
109 ASSERT_PTR_NE(p1, NULL);
110 ASSERT_INT_EQ(sshbuf_set_max_size(p1, sizeof(expbn2) + 3), 0);
111 r = sshbuf_put_bignum2(p1, bn);
112 ASSERT_INT_EQ(r, SSH_ERR_NO_BUFFER_SPACE);
113 ASSERT_SIZE_T_EQ(sshbuf_len(p1), 0);
114 BN_free(bn);
115 sshbuf_free(p1);
116 TEST_DONE();
117
118 TEST_START("sshbuf_get_bignum2");
119 MKBN(hexbn1, bn);
120 p1 = sshbuf_new();
121 ASSERT_PTR_NE(p1, NULL);
122 ASSERT_INT_EQ(sshbuf_put_u32(p1, BN_num_bytes(bn)), 0);
123 ASSERT_INT_EQ(sshbuf_put(p1, expbn1, sizeof(expbn1)), 0);
124 ASSERT_SIZE_T_EQ(sshbuf_len(p1), 4 + sizeof(expbn1));
125 ASSERT_INT_EQ(sshbuf_put_u16(p1, 0xd00f), 0);
126 bn2 = NULL;
127 ASSERT_INT_EQ(sshbuf_get_bignum2(p1, &bn2), 0);
128 ASSERT_BIGNUM_EQ(bn, bn2);
129 ASSERT_SIZE_T_EQ(sshbuf_len(p1), 2);
130 BN_free(bn);
131 BN_free(bn2);
132 sshbuf_free(p1);
133 TEST_DONE();
134
135 TEST_START("sshbuf_get_bignum2 truncated");
136 MKBN(hexbn1, bn);
137 p1 = sshbuf_new();
138 ASSERT_PTR_NE(p1, NULL);
139 ASSERT_INT_EQ(sshbuf_put_u32(p1, BN_num_bytes(bn)), 0);
140 ASSERT_INT_EQ(sshbuf_put(p1, expbn1, sizeof(expbn1) - 1), 0);
141 bn2 = NULL;
142 r = sshbuf_get_bignum2(p1, &bn2);
143 ASSERT_INT_EQ(r, SSH_ERR_MESSAGE_INCOMPLETE);
144 ASSERT_SIZE_T_EQ(sshbuf_len(p1), sizeof(expbn1) + 3);
145 BN_free(bn);
146 BN_free(bn2);
147 sshbuf_free(p1);
148 TEST_DONE();
149
150 TEST_START("sshbuf_get_bignum2 giant");
151 MKBN(hexbn1, bn);
152 p1 = sshbuf_new();
153 ASSERT_PTR_NE(p1, NULL);
154 ASSERT_INT_EQ(sshbuf_put_u32(p1, 65536), 0);
155 ASSERT_INT_EQ(sshbuf_reserve(p1, 65536, NULL), 0);
156 bn2 = NULL;
157 r = sshbuf_get_bignum2(p1, &bn2);
158 ASSERT_INT_EQ(r, SSH_ERR_BIGNUM_TOO_LARGE);
159 ASSERT_SIZE_T_EQ(sshbuf_len(p1), 65536 + 4);
160 BN_free(bn);
161 BN_free(bn2);
162 sshbuf_free(p1);
163 TEST_DONE();
164
165 TEST_START("sshbuf_get_bignum2 bn2");
166 MKBN(hexbn2, bn);
167 p1 = sshbuf_new();
168 ASSERT_PTR_NE(p1, NULL);
169 ASSERT_INT_EQ(sshbuf_put_u32(p1, BN_num_bytes(bn) + 1), 0); /* MSB */
170 ASSERT_INT_EQ(sshbuf_put_u8(p1, 0x00), 0);
171 ASSERT_INT_EQ(sshbuf_put(p1, expbn2, sizeof(expbn2)), 0);
172 ASSERT_SIZE_T_EQ(sshbuf_len(p1), 4 + 1 + sizeof(expbn2));
173 ASSERT_INT_EQ(sshbuf_put_u16(p1, 0xd00f), 0);
174 bn2 = NULL;
175 ASSERT_INT_EQ(sshbuf_get_bignum2(p1, &bn2), 0);
176 ASSERT_BIGNUM_EQ(bn, bn2);
177 ASSERT_SIZE_T_EQ(sshbuf_len(p1), 2);
178 BN_free(bn);
179 BN_free(bn2);
180 sshbuf_free(p1);
181 TEST_DONE();
182
183 TEST_START("sshbuf_get_bignum2 bn2 truncated");
184 MKBN(hexbn2, bn);
185 p1 = sshbuf_new();
186 ASSERT_PTR_NE(p1, NULL);
187 ASSERT_INT_EQ(sshbuf_put_u32(p1, BN_num_bytes(bn) + 1), 0);
188 ASSERT_INT_EQ(sshbuf_put_u8(p1, 0x00), 0);
189 ASSERT_INT_EQ(sshbuf_put(p1, expbn2, sizeof(expbn2) - 1), 0);
190 bn2 = NULL;
191 r = sshbuf_get_bignum2(p1, &bn2);
192 ASSERT_INT_EQ(r, SSH_ERR_MESSAGE_INCOMPLETE);
193 ASSERT_SIZE_T_EQ(sshbuf_len(p1), sizeof(expbn2) + 1 + 4 - 1);
194 BN_free(bn);
195 BN_free(bn2);
196 sshbuf_free(p1);
197 TEST_DONE();
198
199 TEST_START("sshbuf_get_bignum2 bn2 negative");
200 MKBN(hexbn2, bn);
201 p1 = sshbuf_new();
202 ASSERT_PTR_NE(p1, NULL);
203 ASSERT_INT_EQ(sshbuf_put_u32(p1, BN_num_bytes(bn)), 0);
204 ASSERT_INT_EQ(sshbuf_put(p1, expbn2, sizeof(expbn2)), 0);
205 bn2 = NULL;
206 r = sshbuf_get_bignum2(p1, &bn2);
207 ASSERT_INT_EQ(r, SSH_ERR_BIGNUM_IS_NEGATIVE);
208 ASSERT_SIZE_T_EQ(sshbuf_len(p1), sizeof(expbn2) + 4);
209 BN_free(bn);
210 BN_free(bn2);
211 sshbuf_free(p1);
212 TEST_DONE();
213
214 TEST_START("sshbuf_put_ec");
215 eck = EC_KEY_new_by_curve_name(ec256_nid);
216 ASSERT_PTR_NE(eck, NULL);
217 ecp = EC_POINT_new(EC_KEY_get0_group(eck));
218 ASSERT_PTR_NE(ecp, NULL);
219 MKBN(ec256_x, bn_x);
220 MKBN(ec256_y, bn_y);
221 ASSERT_INT_EQ(EC_POINT_set_affine_coordinates_GFp(
222 EC_KEY_get0_group(eck), ecp, bn_x, bn_y, NULL), 1);
223 ASSERT_INT_EQ(EC_KEY_set_public_key(eck, ecp), 1);
224 BN_free(bn_x);
225 BN_free(bn_y);
226 EC_POINT_free(ecp);
227 p1 = sshbuf_new();
228 ASSERT_PTR_NE(p1, NULL);
229 ASSERT_INT_EQ(sshbuf_put_eckey(p1, eck), 0);
230 ASSERT_INT_EQ(sshbuf_get_string_direct(p1, &d, &s), 0);
231 ASSERT_SIZE_T_EQ(s, sizeof(expec256));
232 ASSERT_MEM_EQ(d, expec256, sizeof(expec256));
233 sshbuf_free(p1);
234 EC_KEY_free(eck);
235 TEST_DONE();
236
237 TEST_START("sshbuf_get_ec");
238 eck = EC_KEY_new_by_curve_name(ec256_nid);
239 ASSERT_PTR_NE(eck, NULL);
240 p1 = sshbuf_new();
241 ASSERT_PTR_NE(p1, NULL);
242 ASSERT_INT_EQ(sshbuf_put_string(p1, expec256, sizeof(expec256)), 0);
243 ASSERT_SIZE_T_EQ(sshbuf_len(p1), sizeof(expec256) + 4);
244 ASSERT_INT_EQ(sshbuf_put_u8(p1, 0x00), 0);
245 ASSERT_INT_EQ(sshbuf_get_eckey(p1, eck), 0);
246 bn_x = BN_new();
247 bn_y = BN_new();
248 ASSERT_PTR_NE(bn_x, NULL);
249 ASSERT_PTR_NE(bn_y, NULL);
250 ASSERT_INT_EQ(EC_POINT_get_affine_coordinates_GFp(
251 EC_KEY_get0_group(eck), EC_KEY_get0_public_key(eck),
252 bn_x, bn_y, NULL), 1);
253 MKBN(ec256_x, bn);
254 MKBN(ec256_y, bn2);
255 ASSERT_INT_EQ(BN_cmp(bn_x, bn), 0);
256 ASSERT_INT_EQ(BN_cmp(bn_y, bn2), 0);
257 ASSERT_SIZE_T_EQ(sshbuf_len(p1), 1);
258 sshbuf_free(p1);
259 EC_KEY_free(eck);
260 BN_free(bn_x);
261 BN_free(bn_y);
262 BN_free(bn);
263 BN_free(bn2);
264 TEST_DONE();
265 }
266
267