1 /* 2 * Copyright 2003-2024 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include "e_os.h" 11 #include <string.h> 12 #include <limits.h> 13 #include <openssl/crypto.h> 14 #include "crypto/ctype.h" 15 #include "internal/cryptlib.h" 16 #include "internal/thread_once.h" 17 18 #define DEFAULT_SEPARATOR ':' 19 #define CH_ZERO '\0' 20 21 char *CRYPTO_strdup(const char *str, const char* file, int line) 22 { 23 char *ret; 24 25 if (str == NULL) 26 return NULL; 27 ret = CRYPTO_malloc(strlen(str) + 1, file, line); 28 if (ret != NULL) 29 strcpy(ret, str); 30 return ret; 31 } 32 33 char *CRYPTO_strndup(const char *str, size_t s, const char* file, int line) 34 { 35 size_t maxlen; 36 char *ret; 37 38 if (str == NULL) 39 return NULL; 40 41 maxlen = OPENSSL_strnlen(str, s); 42 43 ret = CRYPTO_malloc(maxlen + 1, file, line); 44 if (ret) { 45 memcpy(ret, str, maxlen); 46 ret[maxlen] = CH_ZERO; 47 } 48 return ret; 49 } 50 51 void *CRYPTO_memdup(const void *data, size_t siz, const char* file, int line) 52 { 53 void *ret; 54 55 if (data == NULL || siz >= INT_MAX) 56 return NULL; 57 58 ret = CRYPTO_malloc(siz, file, line); 59 if (ret == NULL) { 60 ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE); 61 return NULL; 62 } 63 return memcpy(ret, data, siz); 64 } 65 66 size_t OPENSSL_strnlen(const char *str, size_t maxlen) 67 { 68 const char *p; 69 70 for (p = str; maxlen-- != 0 && *p != CH_ZERO; ++p) ; 71 72 return p - str; 73 } 74 75 size_t OPENSSL_strlcpy(char *dst, const char *src, size_t size) 76 { 77 size_t l = 0; 78 for (; size > 1 && *src; size--) { 79 *dst++ = *src++; 80 l++; 81 } 82 if (size) 83 *dst = CH_ZERO; 84 return l + strlen(src); 85 } 86 87 size_t OPENSSL_strlcat(char *dst, const char *src, size_t size) 88 { 89 size_t l = 0; 90 for (; size > 0 && *dst; size--, dst++) 91 l++; 92 return l + OPENSSL_strlcpy(dst, src, size); 93 } 94 95 int OPENSSL_hexchar2int(unsigned char c) 96 { 97 #ifdef CHARSET_EBCDIC 98 c = os_toebcdic[c]; 99 #endif 100 101 switch (c) { 102 case '0': 103 return 0; 104 case '1': 105 return 1; 106 case '2': 107 return 2; 108 case '3': 109 return 3; 110 case '4': 111 return 4; 112 case '5': 113 return 5; 114 case '6': 115 return 6; 116 case '7': 117 return 7; 118 case '8': 119 return 8; 120 case '9': 121 return 9; 122 case 'a': case 'A': 123 return 0x0A; 124 case 'b': case 'B': 125 return 0x0B; 126 case 'c': case 'C': 127 return 0x0C; 128 case 'd': case 'D': 129 return 0x0D; 130 case 'e': case 'E': 131 return 0x0E; 132 case 'f': case 'F': 133 return 0x0F; 134 } 135 return -1; 136 } 137 138 static int hexstr2buf_sep(unsigned char *buf, size_t buf_n, size_t *buflen, 139 const char *str, const char sep) 140 { 141 unsigned char *q; 142 unsigned char ch, cl; 143 int chi, cli; 144 const unsigned char *p; 145 size_t cnt; 146 147 for (p = (const unsigned char *)str, q = buf, cnt = 0; *p; ) { 148 ch = *p++; 149 /* A separator of CH_ZERO means there is no separator */ 150 if (ch == sep && sep != CH_ZERO) 151 continue; 152 cl = *p++; 153 if (!cl) { 154 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ODD_NUMBER_OF_DIGITS); 155 return 0; 156 } 157 cli = OPENSSL_hexchar2int(cl); 158 chi = OPENSSL_hexchar2int(ch); 159 if (cli < 0 || chi < 0) { 160 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_ILLEGAL_HEX_DIGIT); 161 return 0; 162 } 163 cnt++; 164 if (q != NULL) { 165 if (cnt > buf_n) { 166 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER); 167 return 0; 168 } 169 *q++ = (unsigned char)((chi << 4) | cli); 170 } 171 } 172 173 if (buflen != NULL) 174 *buflen = cnt; 175 return 1; 176 } 177 178 /* 179 * Given a string of hex digits convert to a buffer 180 */ 181 int OPENSSL_hexstr2buf_ex(unsigned char *buf, size_t buf_n, size_t *buflen, 182 const char *str, const char sep) 183 { 184 return hexstr2buf_sep(buf, buf_n, buflen, str, sep); 185 } 186 187 unsigned char *ossl_hexstr2buf_sep(const char *str, long *buflen, 188 const char sep) 189 { 190 unsigned char *buf; 191 size_t buf_n, tmp_buflen; 192 193 buf_n = strlen(str); 194 if (buf_n <= 1) { 195 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_HEX_STRING_TOO_SHORT); 196 return NULL; 197 } 198 buf_n /= 2; 199 if ((buf = OPENSSL_malloc(buf_n)) == NULL) { 200 ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE); 201 return NULL; 202 } 203 204 if (buflen != NULL) 205 *buflen = 0; 206 tmp_buflen = 0; 207 if (hexstr2buf_sep(buf, buf_n, &tmp_buflen, str, sep)) { 208 if (buflen != NULL) 209 *buflen = (long)tmp_buflen; 210 return buf; 211 } 212 OPENSSL_free(buf); 213 return NULL; 214 } 215 216 unsigned char *OPENSSL_hexstr2buf(const char *str, long *buflen) 217 { 218 return ossl_hexstr2buf_sep(str, buflen, DEFAULT_SEPARATOR); 219 } 220 221 static int buf2hexstr_sep(char *str, size_t str_n, size_t *strlength, 222 const unsigned char *buf, size_t buflen, 223 const char sep) 224 { 225 static const char hexdig[] = "0123456789ABCDEF"; 226 const unsigned char *p; 227 char *q; 228 size_t i; 229 int has_sep = (sep != CH_ZERO); 230 size_t len = has_sep ? buflen * 3 : 1 + buflen * 2; 231 232 if (len == 0) 233 ++len; 234 if (strlength != NULL) 235 *strlength = len; 236 if (str == NULL) 237 return 1; 238 239 if (str_n < len) { 240 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER); 241 return 0; 242 } 243 244 q = str; 245 for (i = 0, p = buf; i < buflen; i++, p++) { 246 *q++ = hexdig[(*p >> 4) & 0xf]; 247 *q++ = hexdig[*p & 0xf]; 248 if (has_sep) 249 *q++ = sep; 250 } 251 if (has_sep && buflen > 0) 252 --q; 253 *q = CH_ZERO; 254 255 #ifdef CHARSET_EBCDIC 256 ebcdic2ascii(str, str, q - str); 257 #endif 258 return 1; 259 } 260 261 int OPENSSL_buf2hexstr_ex(char *str, size_t str_n, size_t *strlength, 262 const unsigned char *buf, size_t buflen, 263 const char sep) 264 { 265 return buf2hexstr_sep(str, str_n, strlength, buf, buflen, sep); 266 } 267 268 char *ossl_buf2hexstr_sep(const unsigned char *buf, long buflen, char sep) 269 { 270 char *tmp; 271 size_t tmp_n; 272 273 if (buflen == 0) 274 return OPENSSL_zalloc(1); 275 276 tmp_n = (sep != CH_ZERO) ? buflen * 3 : 1 + buflen * 2; 277 if ((tmp = OPENSSL_malloc(tmp_n)) == NULL) { 278 ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE); 279 return NULL; 280 } 281 282 if (buf2hexstr_sep(tmp, tmp_n, NULL, buf, buflen, sep)) 283 return tmp; 284 OPENSSL_free(tmp); 285 return NULL; 286 } 287 288 289 /* 290 * Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its 291 * hex representation @@@ (Contents of buffer are always kept in ASCII, also 292 * on EBCDIC machines) 293 */ 294 char *OPENSSL_buf2hexstr(const unsigned char *buf, long buflen) 295 { 296 return ossl_buf2hexstr_sep(buf, buflen, ':'); 297 } 298 299 int openssl_strerror_r(int errnum, char *buf, size_t buflen) 300 { 301 #if defined(_MSC_VER) && _MSC_VER>=1400 && !defined(_WIN32_WCE) 302 return !strerror_s(buf, buflen, errnum); 303 #elif defined(_GNU_SOURCE) 304 char *err; 305 306 /* 307 * GNU strerror_r may not actually set buf. 308 * It can return a pointer to some (immutable) static string in which case 309 * buf is left unused. 310 */ 311 err = strerror_r(errnum, buf, buflen); 312 if (err == NULL || buflen == 0) 313 return 0; 314 /* 315 * If err is statically allocated, err != buf and we need to copy the data. 316 * If err points somewhere inside buf, OPENSSL_strlcpy can handle this, 317 * since src and dest are not annotated with __restrict and the function 318 * reads src byte for byte and writes to dest. 319 * If err == buf we do not have to copy anything. 320 */ 321 if (err != buf) 322 OPENSSL_strlcpy(buf, err, buflen); 323 return 1; 324 #elif (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \ 325 (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600) 326 /* 327 * We can use "real" strerror_r. The OpenSSL version differs in that it 328 * gives 1 on success and 0 on failure for consistency with other OpenSSL 329 * functions. Real strerror_r does it the other way around 330 */ 331 return !strerror_r(errnum, buf, buflen); 332 #else 333 char *err; 334 335 /* Fall back to non-thread safe strerror()...its all we can do */ 336 if (buflen < 2) 337 return 0; 338 err = strerror(errnum); 339 /* Can this ever happen? */ 340 if (err == NULL) 341 return 0; 342 OPENSSL_strlcpy(buf, err, buflen); 343 return 1; 344 #endif 345 } 346 347 int OPENSSL_strcasecmp(const char *s1, const char *s2) 348 { 349 int t; 350 351 while ((t = ossl_tolower(*s1) - ossl_tolower(*s2++)) == 0) 352 if (*s1++ == '\0') 353 return 0; 354 return t; 355 } 356 357 int OPENSSL_strncasecmp(const char *s1, const char *s2, size_t n) 358 { 359 int t; 360 size_t i; 361 362 for (i = 0; i < n; i++) 363 if ((t = ossl_tolower(*s1) - ossl_tolower(*s2++)) != 0) 364 return t; 365 else if (*s1++ == '\0') 366 return 0; 367 return 0; 368 } 369