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 <openssl/asn1t.h>
60#include <openssl/mem.h>
61#include <openssl/obj.h>
62#include <openssl/err.h>
63
64
65/* Utility functions for manipulating fields and offsets */
66
67/* Add 'offset' to 'addr' */
68#define offset2ptr(addr, offset) (void *)(((char *) addr) + offset)
69
70/* Given an ASN1_ITEM CHOICE type return the selector value */
71int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it) {
72  int *sel = offset2ptr(*pval, it->utype);
73  return *sel;
74}
75
76/* Given an ASN1_ITEM CHOICE type set the selector value, return old value. */
77int asn1_set_choice_selector(ASN1_VALUE **pval, int value,
78                             const ASN1_ITEM *it) {
79  int *sel, ret;
80  sel = offset2ptr(*pval, it->utype);
81  ret = *sel;
82  *sel = value;
83  return ret;
84}
85
86/* Do reference counting. The value 'op' decides what to do. if it is +1 then
87 * the count is incremented. If op is 0 count is set to 1. If op is -1 count is
88 * decremented and the return value is the current refrence count or 0 if no
89 * reference count exists. */
90int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it) {
91  const ASN1_AUX *aux;
92  int *lck, ret;
93  if (it->itype != ASN1_ITYPE_SEQUENCE &&
94      it->itype != ASN1_ITYPE_NDEF_SEQUENCE) {
95    return 0;
96  }
97  aux = it->funcs;
98  if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT)) {
99    return 0;
100  }
101  lck = offset2ptr(*pval, aux->ref_offset);
102  if (op == 0) {
103    *lck = 1;
104    return 1;
105  }
106  ret = CRYPTO_add(lck, op, aux->ref_lock);
107  return ret;
108}
109
110static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it) {
111  const ASN1_AUX *aux;
112  if (!pval || !*pval) {
113    return NULL;
114  }
115  aux = it->funcs;
116  if (!aux || !(aux->flags & ASN1_AFLG_ENCODING)) {
117    return NULL;
118  }
119  return offset2ptr(*pval, aux->enc_offset);
120}
121
122void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it) {
123  ASN1_ENCODING *enc;
124  enc = asn1_get_enc_ptr(pval, it);
125  if (enc) {
126    enc->enc = NULL;
127    enc->len = 0;
128    enc->modified = 1;
129  }
130}
131
132void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it) {
133  ASN1_ENCODING *enc;
134  enc = asn1_get_enc_ptr(pval, it);
135  if (enc) {
136    if (enc->enc) {
137      OPENSSL_free(enc->enc);
138    }
139    enc->enc = NULL;
140    enc->len = 0;
141    enc->modified = 1;
142  }
143}
144
145int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,
146                  const ASN1_ITEM *it) {
147  ASN1_ENCODING *enc;
148  enc = asn1_get_enc_ptr(pval, it);
149  if (!enc) {
150    return 1;
151  }
152
153  if (enc->enc) {
154    OPENSSL_free(enc->enc);
155  }
156  enc->enc = OPENSSL_malloc(inlen);
157  if (!enc->enc) {
158    return 0;
159  }
160  memcpy(enc->enc, in, inlen);
161  enc->len = inlen;
162  enc->modified = 0;
163
164  return 1;
165}
166
167int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,
168                     const ASN1_ITEM *it) {
169  ASN1_ENCODING *enc;
170  enc = asn1_get_enc_ptr(pval, it);
171  if (!enc || enc->modified) {
172    return 0;
173  }
174  if (out) {
175    memcpy(*out, enc->enc, enc->len);
176    *out += enc->len;
177  }
178  if (len) {
179    *len = enc->len;
180  }
181  return 1;
182}
183
184/* Given an ASN1_TEMPLATE get a pointer to a field */
185ASN1_VALUE **asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) {
186  ASN1_VALUE **pvaltmp;
187  if (tt->flags & ASN1_TFLG_COMBINE) {
188    return pval;
189  }
190  pvaltmp = offset2ptr(*pval, tt->offset);
191  /* NOTE for BOOLEAN types the field is just a plain int so we can't return
192   * int **, so settle for (int *). */
193  return pvaltmp;
194}
195
196/* Handle ANY DEFINED BY template, find the selector, look up the relevant
197 * ASN1_TEMPLATE in the table and return it. */
198const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
199                                 int nullerr) {
200  const ASN1_ADB *adb;
201  const ASN1_ADB_TABLE *atbl;
202  long selector;
203  ASN1_VALUE **sfld;
204  int i;
205  if (!(tt->flags & ASN1_TFLG_ADB_MASK)) {
206    return tt;
207  }
208
209  /* Else ANY DEFINED BY ... get the table */
210  adb = ASN1_ADB_ptr(tt->item);
211
212  /* Get the selector field */
213  sfld = offset2ptr(*pval, adb->offset);
214
215  /* Check if NULL */
216  if (!sfld) {
217    if (!adb->null_tt) {
218      goto err;
219    }
220    return adb->null_tt;
221  }
222
223  /* Convert type to a long:
224   * NB: don't check for NID_undef here because it
225   * might be a legitimate value in the table */
226  if (tt->flags & ASN1_TFLG_ADB_OID) {
227    selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);
228  } else {
229    selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);
230  }
231
232  /* Try to find matching entry in table Maybe should check application types
233   * first to allow application override? Might also be useful to have a flag
234   * which indicates table is sorted and we can do a binary search. For now
235   * stick to a linear search. */
236
237  for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++) {
238    if (atbl->value == selector) {
239      return &atbl->tt;
240    }
241  }
242
243  /* FIXME: need to search application table too */
244
245  /* No match, return default type */
246  if (!adb->default_tt) {
247    goto err;
248  }
249  return adb->default_tt;
250
251err:
252  /* FIXME: should log the value or OID of unsupported type */
253  if (nullerr) {
254    OPENSSL_PUT_ERROR(ASN1, asn1_do_adb,
255                      ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);
256  }
257  return NULL;
258}
259