Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/asn1/a_bytes.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This package is an SSL implementation written |
| 6 | * by Eric Young (eay@cryptsoft.com). |
| 7 | * The implementation was written so as to conform with Netscapes SSL. |
| 8 | * |
| 9 | * This library is free for commercial and non-commercial use as long as |
| 10 | * the following conditions are aheared to. The following conditions |
| 11 | * apply to all code found in this distribution, be it the RC4, RSA, |
| 12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| 13 | * included with this distribution is covered by the same copyright terms |
| 14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| 15 | * |
| 16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
| 17 | * the code are not to be removed. |
| 18 | * If this package is used in a product, Eric Young should be given attribution |
| 19 | * as the author of the parts of the library used. |
| 20 | * This can be in the form of a textual message at program startup or |
| 21 | * in documentation (online or textual) provided with the package. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * 1. Redistributions of source code must retain the copyright |
| 27 | * notice, this list of conditions and the following disclaimer. |
| 28 | * 2. Redistributions in binary form must reproduce the above copyright |
| 29 | * notice, this list of conditions and the following disclaimer in the |
| 30 | * documentation and/or other materials provided with the distribution. |
| 31 | * 3. All advertising materials mentioning features or use of this software |
| 32 | * must display the following acknowledgement: |
| 33 | * "This product includes cryptographic software written by |
| 34 | * Eric Young (eay@cryptsoft.com)" |
| 35 | * The word 'cryptographic' can be left out if the rouines from the library |
| 36 | * being used are not cryptographic related :-). |
| 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 38 | * the apps directory (application code) you must include an acknowledgement: |
| 39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 40 | * |
| 41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| 42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 51 | * SUCH DAMAGE. |
| 52 | * |
| 53 | * The licence and distribution terms for any publically available version or |
| 54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
| 55 | * copied and put under another distribution licence |
| 56 | * [including the GNU Public Licence.] |
| 57 | */ |
| 58 | |
| 59 | #include <stdio.h> |
| 60 | #include "cryptlib.h" |
| 61 | #include <openssl/asn1.h> |
| 62 | |
| 63 | static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c); |
| 64 | /* type is a 'bitmap' of acceptable string types. |
| 65 | */ |
| 66 | ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp, |
| 67 | long length, int type) |
| 68 | { |
| 69 | ASN1_STRING *ret=NULL; |
| 70 | const unsigned char *p; |
| 71 | unsigned char *s; |
| 72 | long len; |
| 73 | int inf,tag,xclass; |
| 74 | int i=0; |
| 75 | |
| 76 | p= *pp; |
| 77 | inf=ASN1_get_object(&p,&len,&tag,&xclass,length); |
| 78 | if (inf & 0x80) goto err; |
| 79 | |
| 80 | if (tag >= 32) |
| 81 | { |
| 82 | i=ASN1_R_TAG_VALUE_TOO_HIGH; |
| 83 | goto err; |
| 84 | } |
| 85 | if (!(ASN1_tag2bit(tag) & type)) |
| 86 | { |
| 87 | i=ASN1_R_WRONG_TYPE; |
| 88 | goto err; |
| 89 | } |
| 90 | |
| 91 | /* If a bit-string, exit early */ |
| 92 | if (tag == V_ASN1_BIT_STRING) |
| 93 | return(d2i_ASN1_BIT_STRING(a,pp,length)); |
| 94 | |
| 95 | if ((a == NULL) || ((*a) == NULL)) |
| 96 | { |
| 97 | if ((ret=ASN1_STRING_new()) == NULL) return(NULL); |
| 98 | } |
| 99 | else |
| 100 | ret=(*a); |
| 101 | |
| 102 | if (len != 0) |
| 103 | { |
| 104 | s=(unsigned char *)OPENSSL_malloc((int)len+1); |
| 105 | if (s == NULL) |
| 106 | { |
| 107 | i=ERR_R_MALLOC_FAILURE; |
| 108 | goto err; |
| 109 | } |
| 110 | memcpy(s,p,(int)len); |
| 111 | s[len]='\0'; |
| 112 | p+=len; |
| 113 | } |
| 114 | else |
| 115 | s=NULL; |
| 116 | |
| 117 | if (ret->data != NULL) OPENSSL_free(ret->data); |
| 118 | ret->length=(int)len; |
| 119 | ret->data=s; |
| 120 | ret->type=tag; |
| 121 | if (a != NULL) (*a)=ret; |
| 122 | *pp=p; |
| 123 | return(ret); |
| 124 | err: |
| 125 | ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i); |
| 126 | if ((ret != NULL) && ((a == NULL) || (*a != ret))) |
| 127 | ASN1_STRING_free(ret); |
| 128 | return(NULL); |
| 129 | } |
| 130 | |
| 131 | int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass) |
| 132 | { |
| 133 | int ret,r,constructed; |
| 134 | unsigned char *p; |
| 135 | |
| 136 | if (a == NULL) return(0); |
| 137 | |
| 138 | if (tag == V_ASN1_BIT_STRING) |
| 139 | return(i2d_ASN1_BIT_STRING(a,pp)); |
| 140 | |
| 141 | ret=a->length; |
| 142 | r=ASN1_object_size(0,ret,tag); |
| 143 | if (pp == NULL) return(r); |
| 144 | p= *pp; |
| 145 | |
| 146 | if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET)) |
| 147 | constructed=1; |
| 148 | else |
| 149 | constructed=0; |
| 150 | ASN1_put_object(&p,constructed,ret,tag,xclass); |
| 151 | memcpy(p,a->data,a->length); |
| 152 | p+=a->length; |
| 153 | *pp= p; |
| 154 | return(r); |
| 155 | } |
| 156 | |
| 157 | ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp, |
| 158 | long length, int Ptag, int Pclass) |
| 159 | { |
| 160 | ASN1_STRING *ret=NULL; |
| 161 | const unsigned char *p; |
| 162 | unsigned char *s; |
| 163 | long len; |
| 164 | int inf,tag,xclass; |
| 165 | int i=0; |
| 166 | |
| 167 | if ((a == NULL) || ((*a) == NULL)) |
| 168 | { |
| 169 | if ((ret=ASN1_STRING_new()) == NULL) return(NULL); |
| 170 | } |
| 171 | else |
| 172 | ret=(*a); |
| 173 | |
| 174 | p= *pp; |
| 175 | inf=ASN1_get_object(&p,&len,&tag,&xclass,length); |
| 176 | if (inf & 0x80) |
| 177 | { |
| 178 | i=ASN1_R_BAD_OBJECT_HEADER; |
| 179 | goto err; |
| 180 | } |
| 181 | |
| 182 | if (tag != Ptag) |
| 183 | { |
| 184 | i=ASN1_R_WRONG_TAG; |
| 185 | goto err; |
| 186 | } |
| 187 | |
| 188 | if (inf & V_ASN1_CONSTRUCTED) |
| 189 | { |
| 190 | ASN1_const_CTX c; |
| 191 | |
| 192 | c.pp=pp; |
| 193 | c.p=p; |
| 194 | c.inf=inf; |
| 195 | c.slen=len; |
| 196 | c.tag=Ptag; |
| 197 | c.xclass=Pclass; |
| 198 | c.max=(length == 0)?0:(p+length); |
| 199 | if (!asn1_collate_primitive(ret,&c)) |
| 200 | goto err; |
| 201 | else |
| 202 | { |
| 203 | p=c.p; |
| 204 | } |
| 205 | } |
| 206 | else |
| 207 | { |
| 208 | if (len != 0) |
| 209 | { |
| 210 | if ((ret->length < len) || (ret->data == NULL)) |
| 211 | { |
| 212 | if (ret->data != NULL) OPENSSL_free(ret->data); |
| 213 | s=(unsigned char *)OPENSSL_malloc((int)len + 1); |
| 214 | if (s == NULL) |
| 215 | { |
| 216 | i=ERR_R_MALLOC_FAILURE; |
| 217 | goto err; |
| 218 | } |
| 219 | } |
| 220 | else |
| 221 | s=ret->data; |
| 222 | memcpy(s,p,(int)len); |
| 223 | s[len] = '\0'; |
| 224 | p+=len; |
| 225 | } |
| 226 | else |
| 227 | { |
| 228 | s=NULL; |
| 229 | if (ret->data != NULL) OPENSSL_free(ret->data); |
| 230 | } |
| 231 | |
| 232 | ret->length=(int)len; |
| 233 | ret->data=s; |
| 234 | ret->type=Ptag; |
| 235 | } |
| 236 | |
| 237 | if (a != NULL) (*a)=ret; |
| 238 | *pp=p; |
| 239 | return(ret); |
| 240 | err: |
| 241 | if ((ret != NULL) && ((a == NULL) || (*a != ret))) |
| 242 | ASN1_STRING_free(ret); |
| 243 | ASN1err(ASN1_F_D2I_ASN1_BYTES,i); |
| 244 | return(NULL); |
| 245 | } |
| 246 | |
| 247 | |
| 248 | /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse |
| 249 | * them into the one structure that is then returned */ |
| 250 | /* There have been a few bug fixes for this function from |
| 251 | * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */ |
| 252 | static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c) |
| 253 | { |
| 254 | ASN1_STRING *os=NULL; |
| 255 | BUF_MEM b; |
| 256 | int num; |
| 257 | |
| 258 | b.length=0; |
| 259 | b.max=0; |
| 260 | b.data=NULL; |
| 261 | |
| 262 | if (a == NULL) |
| 263 | { |
| 264 | c->error=ERR_R_PASSED_NULL_PARAMETER; |
| 265 | goto err; |
| 266 | } |
| 267 | |
| 268 | num=0; |
| 269 | for (;;) |
| 270 | { |
| 271 | if (c->inf & 1) |
| 272 | { |
| 273 | c->eos=ASN1_const_check_infinite_end(&c->p, |
| 274 | (long)(c->max-c->p)); |
| 275 | if (c->eos) break; |
| 276 | } |
| 277 | else |
| 278 | { |
| 279 | if (c->slen <= 0) break; |
| 280 | } |
| 281 | |
| 282 | c->q=c->p; |
| 283 | if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass) |
| 284 | == NULL) |
| 285 | { |
| 286 | c->error=ERR_R_ASN1_LIB; |
| 287 | goto err; |
| 288 | } |
| 289 | |
| 290 | if (!BUF_MEM_grow_clean(&b,num+os->length)) |
| 291 | { |
| 292 | c->error=ERR_R_BUF_LIB; |
| 293 | goto err; |
| 294 | } |
| 295 | memcpy(&(b.data[num]),os->data,os->length); |
| 296 | if (!(c->inf & 1)) |
| 297 | c->slen-=(c->p-c->q); |
| 298 | num+=os->length; |
| 299 | } |
| 300 | |
| 301 | if (!asn1_const_Finish(c)) goto err; |
| 302 | |
| 303 | a->length=num; |
| 304 | if (a->data != NULL) OPENSSL_free(a->data); |
| 305 | a->data=(unsigned char *)b.data; |
| 306 | if (os != NULL) ASN1_STRING_free(os); |
| 307 | return(1); |
| 308 | err: |
| 309 | ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error); |
| 310 | if (os != NULL) ASN1_STRING_free(os); |
| 311 | if (b.data != NULL) OPENSSL_free(b.data); |
| 312 | return(0); |
| 313 | } |
| 314 | |