Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 2 | * All rights reserved. |
| 3 | * |
| 4 | * This package is an SSL implementation written |
| 5 | * by Eric Young (eay@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@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@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@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 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 65 | static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb); |
| 66 | |
| 67 | #ifndef NO_OLD_ASN1 |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 68 | # ifndef OPENSSL_NO_FP_API |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 69 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 70 | void *ASN1_d2i_fp(void *(*xnew) (void), d2i_of_void *d2i, FILE *in, void **x) |
| 71 | { |
| 72 | BIO *b; |
| 73 | void *ret; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 74 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 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 |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 85 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 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; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 92 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 93 | len = asn1_d2i_read_bio(in, &b); |
| 94 | if (len < 0) |
| 95 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 96 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 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 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 104 | |
| 105 | #endif |
| 106 | |
| 107 | void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x) |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 108 | { |
| 109 | BUF_MEM *b = NULL; |
| 110 | const unsigned char *p; |
| 111 | void *ret = NULL; |
| 112 | int len; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 113 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 114 | len = asn1_d2i_read_bio(in, &b); |
| 115 | if (len < 0) |
| 116 | goto err; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 117 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 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 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 125 | |
| 126 | #ifndef OPENSSL_NO_FP_API |
| 127 | void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x) |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 128 | { |
| 129 | BIO *b; |
| 130 | char *ret; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 131 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 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 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 141 | #endif |
| 142 | |
| 143 | #define HEADER_SIZE 8 |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 144 | #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024) |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 145 | static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb) |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 146 | { |
| 147 | BUF_MEM *b; |
| 148 | unsigned char *p; |
| 149 | int i; |
| 150 | ASN1_const_CTX c; |
| 151 | size_t want = HEADER_SIZE; |
| 152 | int eos = 0; |
| 153 | size_t off = 0; |
| 154 | size_t len = 0; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 155 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 156 | b = BUF_MEM_new(); |
| 157 | if (b == NULL) { |
| 158 | OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); |
| 159 | return -1; |
| 160 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 161 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 162 | ERR_clear_error(); |
| 163 | for (;;) { |
| 164 | if (want >= (len - off)) { |
| 165 | want -= (len - off); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 166 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 167 | if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) { |
| 168 | OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); |
| 169 | goto err; |
| 170 | } |
| 171 | i = BIO_read(in, &(b->data[len]), want); |
| 172 | if ((i < 0) && ((len - off) == 0)) { |
| 173 | OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA); |
| 174 | goto err; |
| 175 | } |
| 176 | if (i > 0) { |
| 177 | if (len + i < len) { |
| 178 | OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); |
| 179 | goto err; |
| 180 | } |
| 181 | len += i; |
| 182 | } |
| 183 | } |
| 184 | /* else data already loaded */ |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 185 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 186 | p = (unsigned char *)&(b->data[off]); |
| 187 | c.p = p; |
| 188 | c.inf = ASN1_get_object(&(c.p), &(c.slen), &(c.tag), &(c.xclass), |
| 189 | len - off); |
| 190 | if (c.inf & 0x80) { |
| 191 | uint32_t e; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 192 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 193 | e = ERR_GET_REASON(ERR_peek_error()); |
| 194 | if (e != ASN1_R_TOO_LONG) |
| 195 | goto err; |
| 196 | else |
| 197 | ERR_clear_error(); /* clear error */ |
| 198 | } |
| 199 | i = c.p - p; /* header length */ |
| 200 | off += i; /* end of data */ |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 201 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 202 | if (c.inf & 1) { |
| 203 | /* no data body so go round again */ |
| 204 | eos++; |
| 205 | if (eos < 0) { |
| 206 | OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG); |
| 207 | goto err; |
| 208 | } |
| 209 | want = HEADER_SIZE; |
| 210 | } else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC)) { |
| 211 | /* eos value, so go back and read another header */ |
| 212 | eos--; |
| 213 | if (eos <= 0) |
| 214 | break; |
| 215 | else |
| 216 | want = HEADER_SIZE; |
| 217 | } else { |
| 218 | /* suck in c.slen bytes of data */ |
| 219 | want = c.slen; |
| 220 | if (want > (len - off)) { |
| 221 | size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE; |
| 222 | want -= (len - off); |
| 223 | if (want > INT_MAX /* BIO_read takes an int length */ || |
| 224 | len + want < len) { |
| 225 | OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); |
| 226 | goto err; |
| 227 | } |
| 228 | while (want > 0) { |
| 229 | /* |
| 230 | * Read content in chunks of increasing size |
| 231 | * so we can return an error for EOF without |
| 232 | * having to allocate the entire content length |
| 233 | * in one go. |
| 234 | */ |
| 235 | size_t chunk = want > chunk_max ? chunk_max : want; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 236 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 237 | if (!BUF_MEM_grow_clean(b, len + chunk)) { |
| 238 | OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE); |
| 239 | goto err; |
| 240 | } |
| 241 | want -= chunk; |
| 242 | while (chunk > 0) { |
| 243 | i = BIO_read(in, &(b->data[len]), chunk); |
| 244 | if (i <= 0) { |
| 245 | OPENSSL_PUT_ERROR(ASN1, ASN1_R_NOT_ENOUGH_DATA); |
| 246 | goto err; |
| 247 | } |
| 248 | /* |
| 249 | * This can't overflow because |len+want| didn't |
| 250 | * overflow. |
| 251 | */ |
| 252 | len += i; |
| 253 | chunk -= i; |
| 254 | } |
| 255 | if (chunk_max < INT_MAX/2) |
| 256 | chunk_max *= 2; |
| 257 | } |
| 258 | } |
| 259 | if (off + c.slen < off) { |
| 260 | OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); |
| 261 | goto err; |
| 262 | } |
| 263 | off += c.slen; |
| 264 | if (eos <= 0) { |
| 265 | break; |
| 266 | } else |
| 267 | want = HEADER_SIZE; |
| 268 | } |
| 269 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 270 | |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 271 | if (off > INT_MAX) { |
| 272 | OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG); |
| 273 | goto err; |
| 274 | } |
| 275 | |
| 276 | *pb = b; |
| 277 | return off; |
| 278 | err: |
| 279 | if (b != NULL) |
| 280 | BUF_MEM_free(b); |
| 281 | return -1; |
| 282 | } |