1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/asn1.h> 58 59 #include <limits.h> 60 61 #include <openssl/buf.h> 62 #include <openssl/err.h> 63 #include <openssl/mem.h> 64 65 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb); 66 67 #ifndef NO_OLD_ASN1 68 # ifndef OPENSSL_NO_FP_API 69 70 void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x) 71 { 72 BIO *b; 73 void *ret; 74 75 if ((b = BIO_new(BIO_s_file())) == NULL) { 76 OPENSSL_PUT_ERROR(ASN1, ERR_R_BUF_LIB); 77 return (NULL); 78 } 79 BIO_set_fp(b, in, BIO_NOCLOSE); 80 ret = ASN1_d2i_bio(xnew, d2i, b, x); 81 BIO_free(b); 82 return (ret); 83 } 84 # endif 85 86 void *ASN1_d2i_bio(void *(*xnew) (void), d2i_of_void *d2i, BIO *in, void **x) 87 { 88 BUF_MEM *b = NULL; 89 const unsigned char *p; 90 void *ret = NULL; 91 int len; 92 93 len = asn1_d2i_read_bio(in, &b); 94 if (len < 0) 95 goto err; 96 97 p = (unsigned char *)b->data; 98 ret = d2i(x, &p, len); 99 err: 100 if (b != NULL) 101 BUF_MEM_free(b); 102 return (ret); 103 } 104 105 #endif 106 107 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x) 108 { 109 BUF_MEM *b = NULL; 110 const unsigned char *p; 111 void *ret = NULL; 112 int len; 113 114 len = asn1_d2i_read_bio(in, &b); 115 if (len < 0) 116 goto err; 117 118 p = (const unsigned char *)b->data; 119 ret = ASN1_item_d2i(x, &p, len, it); 120 err: 121 if (b != NULL) 122 BUF_MEM_free(b); 123 return (ret); 124 } 125 126 #ifndef OPENSSL_NO_FP_API 127 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x) 128 { 129 BIO *b; 130 char *ret; 131 132 if ((b = BIO_new(BIO_s_file())) == NULL) { 133 OPENSSL_PUT_ERROR(ASN1, ERR_R_BUF_LIB); 134 return (NULL); 135 } 136 BIO_set_fp(b, in, BIO_NOCLOSE); 137 ret = ASN1_item_d2i_bio(it, b, x); 138 BIO_free(b); 139 return (ret); 140 } 141 #endif 142 143 typedef struct asn1_const_ctx_st 144 { 145 const unsigned char *p;/* work char pointer */ 146 int eos; /* end of sequence read for indefinite encoding */ 147 int error; /* error code to use when returning an error */ 148 int inf; /* constructed if 0x20, indefinite is 0x21 */ 149 int tag; /* tag from last 'get object' */ 150 int xclass; /* class from last 'get object' */ 151 long slen; /* length of last 'get object' */ 152 const unsigned char *max; /* largest value of p allowed */ 153 const unsigned char *q;/* temporary variable */ 154 const unsigned char **pp;/* variable */ 155 int line; /* used in error processing */ 156 } ASN1_const_CTX; 157 158 #define HEADER_SIZE 8 159 #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024) 160 static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb) 161 { 162 BUF_MEM *b; 163 unsigned char *p; 164 int i; 165 ASN1_const_CTX c; 166 size_t want = HEADER_SIZE; 167 int eos = 0; 168 size_t off = 0; 169 size_t len = 0; 170 171 b = BUF_MEM_new(); 172 if (b == NULL) { 173 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 174 return -1; 175 } 176 177 ERR_clear_error(); 178 for (;;) { 179 if (want >= (len - off)) { 180 want -= (len - off); 181 182 if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) { 183 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 184 goto err; 185 } 186 i = BIO_read(in, &(b->data[len]), want); 187 if ((i < 0) && ((len - off) == 0)) { 188 OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA); 189 goto err; 190 } 191 if (i > 0) { 192 if (len + i < len) { 193 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); 194 goto err; 195 } 196 len += i; 197 } 198 } 199 /* else data already loaded */ 200 201 p = (unsigned char *)&(b->data[off]); 202 c.p = p; 203 c.inf = ASN1_get_object(&(c.p), &(c.slen), &(c.tag), &(c.xclass), 204 len - off); 205 if (c.inf & 0x80) { 206 uint32_t e; 207 208 e = ERR_GET_REASON(ERR_peek_error()); 209 if (e != ASN1_R_TOO_LONG) 210 goto err; 211 else 212 ERR_clear_error(); /* clear error */ 213 } 214 i = c.p - p; /* header length */ 215 off += i; /* end of data */ 216 217 if (c.inf & 1) { 218 /* no data body so go round again */ 219 eos++; 220 if (eos < 0) { 221 OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG); 222 goto err; 223 } 224 want = HEADER_SIZE; 225 } else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC)) { 226 /* eos value, so go back and read another header */ 227 eos--; 228 if (eos <= 0) 229 break; 230 else 231 want = HEADER_SIZE; 232 } else { 233 /* suck in c.slen bytes of data */ 234 want = c.slen; 235 if (want > (len - off)) { 236 size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE; 237 want -= (len - off); 238 if (want > INT_MAX /* BIO_read takes an int length */ || 239 len + want < len) { 240 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); 241 goto err; 242 } 243 while (want > 0) { 244 /* 245 * Read content in chunks of increasing size 246 * so we can return an error for EOF without 247 * having to allocate the entire content length 248 * in one go. 249 */ 250 size_t chunk = want > chunk_max ? chunk_max : want; 251 252 if (!BUF_MEM_grow_clean(b, len + chunk)) { 253 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); 254 goto err; 255 } 256 want -= chunk; 257 while (chunk > 0) { 258 i = BIO_read(in, &(b->data[len]), chunk); 259 if (i <= 0) { 260 OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA); 261 goto err; 262 } 263 /* 264 * This can't overflow because |len+want| didn't 265 * overflow. 266 */ 267 len += i; 268 chunk -= i; 269 } 270 if (chunk_max < INT_MAX/2) 271 chunk_max *= 2; 272 } 273 } 274 if (off + c.slen < off) { 275 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); 276 goto err; 277 } 278 off += c.slen; 279 if (eos <= 0) { 280 break; 281 } else 282 want = HEADER_SIZE; 283 } 284 } 285 286 if (off > INT_MAX) { 287 OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); 288 goto err; 289 } 290 291 *pb = b; 292 return off; 293 err: 294 if (b != NULL) 295 BUF_MEM_free(b); 296 return -1; 297 } 298
