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 22void sshbuf_getput_crypto_tests(void); 23 24void 25sshbuf_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