1 /*
2 * Copyright 2000-2021 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 <stddef.h>
11 #include <openssl/asn1.h>
12 #include <openssl/objects.h>
13 #include <openssl/err.h>
14 #include <openssl/asn1t.h>
15 #include <string.h>
16 #include "asn1_local.h"
17
18 static int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
19 int embed, OSSL_LIB_CTX *libctx,
20 const char *propq);
21 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
22 int embed);
23 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
24 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
25 OSSL_LIB_CTX *libctx, const char *propq);
26 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);
27 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
28
ASN1_item_new(const ASN1_ITEM * it)29 ASN1_VALUE *ASN1_item_new(const ASN1_ITEM *it)
30 {
31 ASN1_VALUE *ret = NULL;
32 if (ASN1_item_ex_new(&ret, it) > 0)
33 return ret;
34 return NULL;
35 }
36
ASN1_item_new_ex(const ASN1_ITEM * it,OSSL_LIB_CTX * libctx,const char * propq)37 ASN1_VALUE *ASN1_item_new_ex(const ASN1_ITEM *it, OSSL_LIB_CTX *libctx,
38 const char *propq)
39 {
40 ASN1_VALUE *ret = NULL;
41 if (asn1_item_embed_new(&ret, it, 0, libctx, propq) > 0)
42 return ret;
43 return NULL;
44 }
45
46 /* Allocate an ASN1 structure */
47
48
ossl_asn1_item_ex_new_intern(ASN1_VALUE ** pval,const ASN1_ITEM * it,OSSL_LIB_CTX * libctx,const char * propq)49 int ossl_asn1_item_ex_new_intern(ASN1_VALUE **pval, const ASN1_ITEM *it,
50 OSSL_LIB_CTX *libctx, const char *propq)
51 {
52 return asn1_item_embed_new(pval, it, 0, libctx, propq);
53 }
54
ASN1_item_ex_new(ASN1_VALUE ** pval,const ASN1_ITEM * it)55 int ASN1_item_ex_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
56 {
57 return asn1_item_embed_new(pval, it, 0, NULL, NULL);
58 }
59
asn1_item_embed_new(ASN1_VALUE ** pval,const ASN1_ITEM * it,int embed,OSSL_LIB_CTX * libctx,const char * propq)60 int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed,
61 OSSL_LIB_CTX *libctx, const char *propq)
62 {
63 const ASN1_TEMPLATE *tt = NULL;
64 const ASN1_EXTERN_FUNCS *ef;
65 const ASN1_AUX *aux = it->funcs;
66 ASN1_aux_cb *asn1_cb;
67 ASN1_VALUE **pseqval;
68 int i;
69 if (aux && aux->asn1_cb)
70 asn1_cb = aux->asn1_cb;
71 else
72 asn1_cb = 0;
73
74 switch (it->itype) {
75
76 case ASN1_ITYPE_EXTERN:
77 ef = it->funcs;
78 if (ef != NULL) {
79 if (ef->asn1_ex_new_ex != NULL) {
80 if (!ef->asn1_ex_new_ex(pval, it, libctx, propq))
81 goto asn1err;
82 } else if (ef->asn1_ex_new != NULL) {
83 if (!ef->asn1_ex_new(pval, it))
84 goto asn1err;
85 }
86 }
87 break;
88
89 case ASN1_ITYPE_PRIMITIVE:
90 if (it->templates) {
91 if (!asn1_template_new(pval, it->templates, libctx, propq))
92 goto asn1err;
93 } else if (!asn1_primitive_new(pval, it, embed))
94 goto asn1err;
95 break;
96
97 case ASN1_ITYPE_MSTRING:
98 if (!asn1_primitive_new(pval, it, embed))
99 goto asn1err;
100 break;
101
102 case ASN1_ITYPE_CHOICE:
103 if (asn1_cb) {
104 i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
105 if (!i)
106 goto auxerr;
107 if (i == 2) {
108 return 1;
109 }
110 }
111 if (embed) {
112 memset(*pval, 0, it->size);
113 } else {
114 *pval = OPENSSL_zalloc(it->size);
115 if (*pval == NULL)
116 return 0;
117 }
118 ossl_asn1_set_choice_selector(pval, -1, it);
119 if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
120 goto auxerr2;
121 break;
122
123 case ASN1_ITYPE_NDEF_SEQUENCE:
124 case ASN1_ITYPE_SEQUENCE:
125 if (asn1_cb) {
126 i = asn1_cb(ASN1_OP_NEW_PRE, pval, it, NULL);
127 if (!i)
128 goto auxerr;
129 if (i == 2) {
130 return 1;
131 }
132 }
133 if (embed) {
134 memset(*pval, 0, it->size);
135 } else {
136 *pval = OPENSSL_zalloc(it->size);
137 if (*pval == NULL)
138 return 0;
139 }
140 /* 0 : init. lock */
141 if (ossl_asn1_do_lock(pval, 0, it) < 0) {
142 if (!embed) {
143 OPENSSL_free(*pval);
144 *pval = NULL;
145 }
146 goto asn1err;
147 }
148 ossl_asn1_enc_init(pval, it);
149 for (i = 0, tt = it->templates; i < it->tcount; tt++, i++) {
150 pseqval = ossl_asn1_get_field_ptr(pval, tt);
151 if (!asn1_template_new(pseqval, tt, libctx, propq))
152 goto asn1err2;
153 }
154 if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
155 goto auxerr2;
156 break;
157 }
158 return 1;
159
160 asn1err2:
161 ossl_asn1_item_embed_free(pval, it, embed);
162 asn1err:
163 ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
164 return 0;
165
166 auxerr2:
167 ossl_asn1_item_embed_free(pval, it, embed);
168 auxerr:
169 ERR_raise(ERR_LIB_ASN1, ASN1_R_AUX_ERROR);
170 return 0;
171
172 }
173
asn1_item_clear(ASN1_VALUE ** pval,const ASN1_ITEM * it)174 static void asn1_item_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
175 {
176 const ASN1_EXTERN_FUNCS *ef;
177
178 switch (it->itype) {
179
180 case ASN1_ITYPE_EXTERN:
181 ef = it->funcs;
182 if (ef && ef->asn1_ex_clear)
183 ef->asn1_ex_clear(pval, it);
184 else
185 *pval = NULL;
186 break;
187
188 case ASN1_ITYPE_PRIMITIVE:
189 if (it->templates)
190 asn1_template_clear(pval, it->templates);
191 else
192 asn1_primitive_clear(pval, it);
193 break;
194
195 case ASN1_ITYPE_MSTRING:
196 asn1_primitive_clear(pval, it);
197 break;
198
199 case ASN1_ITYPE_CHOICE:
200 case ASN1_ITYPE_SEQUENCE:
201 case ASN1_ITYPE_NDEF_SEQUENCE:
202 *pval = NULL;
203 break;
204 }
205 }
206
asn1_template_new(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt,OSSL_LIB_CTX * libctx,const char * propq)207 static int asn1_template_new(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,
208 OSSL_LIB_CTX *libctx, const char *propq)
209 {
210 const ASN1_ITEM *it = ASN1_ITEM_ptr(tt->item);
211 int embed = tt->flags & ASN1_TFLG_EMBED;
212 ASN1_VALUE *tval;
213 int ret;
214 if (embed) {
215 tval = (ASN1_VALUE *)pval;
216 pval = &tval;
217 }
218 if (tt->flags & ASN1_TFLG_OPTIONAL) {
219 asn1_template_clear(pval, tt);
220 return 1;
221 }
222 /* If ANY DEFINED BY nothing to do */
223
224 if (tt->flags & ASN1_TFLG_ADB_MASK) {
225 *pval = NULL;
226 return 1;
227 }
228 /* If SET OF or SEQUENCE OF, its a STACK */
229 if (tt->flags & ASN1_TFLG_SK_MASK) {
230 STACK_OF(ASN1_VALUE) *skval;
231 skval = sk_ASN1_VALUE_new_null();
232 if (!skval) {
233 ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
234 ret = 0;
235 goto done;
236 }
237 *pval = (ASN1_VALUE *)skval;
238 ret = 1;
239 goto done;
240 }
241 /* Otherwise pass it back to the item routine */
242 ret = asn1_item_embed_new(pval, it, embed, libctx, propq);
243 done:
244 return ret;
245 }
246
asn1_template_clear(ASN1_VALUE ** pval,const ASN1_TEMPLATE * tt)247 static void asn1_template_clear(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
248 {
249 /* If ADB or STACK just NULL the field */
250 if (tt->flags & (ASN1_TFLG_ADB_MASK | ASN1_TFLG_SK_MASK))
251 *pval = NULL;
252 else
253 asn1_item_clear(pval, ASN1_ITEM_ptr(tt->item));
254 }
255
256 /*
257 * NB: could probably combine most of the real XXX_new() behaviour and junk
258 * all the old functions.
259 */
260
asn1_primitive_new(ASN1_VALUE ** pval,const ASN1_ITEM * it,int embed)261 static int asn1_primitive_new(ASN1_VALUE **pval, const ASN1_ITEM *it,
262 int embed)
263 {
264 ASN1_TYPE *typ;
265 ASN1_STRING *str;
266 int utype;
267
268 if (!it)
269 return 0;
270
271 if (it->funcs) {
272 const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
273 if (embed) {
274 if (pf->prim_clear) {
275 pf->prim_clear(pval, it);
276 return 1;
277 }
278 } else if (pf->prim_new) {
279 return pf->prim_new(pval, it);
280 }
281 }
282
283 if (it->itype == ASN1_ITYPE_MSTRING)
284 utype = -1;
285 else
286 utype = it->utype;
287 switch (utype) {
288 case V_ASN1_OBJECT:
289 *pval = (ASN1_VALUE *)OBJ_nid2obj(NID_undef);
290 return 1;
291
292 case V_ASN1_BOOLEAN:
293 *(ASN1_BOOLEAN *)pval = it->size;
294 return 1;
295
296 case V_ASN1_NULL:
297 *pval = (ASN1_VALUE *)1;
298 return 1;
299
300 case V_ASN1_ANY:
301 if ((typ = OPENSSL_malloc(sizeof(*typ))) == NULL)
302 return 0;
303 typ->value.ptr = NULL;
304 typ->type = -1;
305 *pval = (ASN1_VALUE *)typ;
306 break;
307
308 default:
309 if (embed) {
310 str = *(ASN1_STRING **)pval;
311 memset(str, 0, sizeof(*str));
312 str->type = utype;
313 str->flags = ASN1_STRING_FLAG_EMBED;
314 } else {
315 str = ASN1_STRING_type_new(utype);
316 *pval = (ASN1_VALUE *)str;
317 }
318 if (it->itype == ASN1_ITYPE_MSTRING && str)
319 str->flags |= ASN1_STRING_FLAG_MSTRING;
320 break;
321 }
322 if (*pval)
323 return 1;
324 return 0;
325 }
326
asn1_primitive_clear(ASN1_VALUE ** pval,const ASN1_ITEM * it)327 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
328 {
329 int utype;
330 if (it && it->funcs) {
331 const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
332 if (pf->prim_clear)
333 pf->prim_clear(pval, it);
334 else
335 *pval = NULL;
336 return;
337 }
338 if (!it || (it->itype == ASN1_ITYPE_MSTRING))
339 utype = -1;
340 else
341 utype = it->utype;
342 if (utype == V_ASN1_BOOLEAN)
343 *(ASN1_BOOLEAN *)pval = it->size;
344 else
345 *pval = NULL;
346 }
347
