1 /* bio_ndef.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project.
4 */
5 /* ====================================================================
6 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 */
54
55 #include <openssl/asn1.h>
56 #include <openssl/asn1t.h>
57 #include <openssl/bio.h>
58 #include <openssl/err.h>
59
60 #include <stdio.h>
61
62 /* Experimental NDEF ASN1 BIO support routines */
63
64 /* The usage is quite simple, initialize an ASN1 structure,
65 * get a BIO from it then any data written through the BIO
66 * will end up translated to approptiate format on the fly.
67 * The data is streamed out and does *not* need to be
68 * all held in memory at once.
69 *
70 * When the BIO is flushed the output is finalized and any
71 * signatures etc written out.
72 *
73 * The BIO is a 'proper' BIO and can handle non blocking I/O
74 * correctly.
75 *
76 * The usage is simple. The implementation is *not*...
77 */
78
79 /* BIO support data stored in the ASN1 BIO ex_arg */
80
81 typedef struct ndef_aux_st
82 {
83 /* ASN1 structure this BIO refers to */
84 ASN1_VALUE *val;
85 const ASN1_ITEM *it;
86 /* Top of the BIO chain */
87 BIO *ndef_bio;
88 /* Output BIO */
89 BIO *out;
90 /* Boundary where content is inserted */
91 unsigned char **boundary;
92 /* DER buffer start */
93 unsigned char *derbuf;
94 } NDEF_SUPPORT;
95
96 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
97 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
98 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
99 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
100
101 BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
102 {
103 NDEF_SUPPORT *ndef_aux = NULL;
104 BIO *asn_bio = NULL;
105 const ASN1_AUX *aux = it->funcs;
106 ASN1_STREAM_ARG sarg;
107
108 if (!aux || !aux->asn1_cb)
109 {
110 ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
111 return NULL;
112 }
113 ndef_aux = OPENSSL_malloc(sizeof(NDEF_SUPPORT));
114 asn_bio = BIO_new(BIO_f_asn1());
115
116 /* ASN1 bio needs to be next to output BIO */
117
118 out = BIO_push(asn_bio, out);
119
120 if (!ndef_aux || !asn_bio || !out)
121 goto err;
122
123 BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
124 BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
125
126 /* Now let callback prepend any digest, cipher etc BIOs
127 * ASN1 structure needs.
128 */
129
130 sarg.out = out;
131 sarg.ndef_bio = NULL;
132 sarg.boundary = NULL;
133
134 if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
135 goto err;
136
137 ndef_aux->val = val;
138 ndef_aux->it = it;
139 ndef_aux->ndef_bio = sarg.ndef_bio;
140 ndef_aux->boundary = sarg.boundary;
141 ndef_aux->out = out;
142
143 BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
144
145 return sarg.ndef_bio;
146
147 err:
148 if (asn_bio)
149 BIO_free(asn_bio);
150 if (ndef_aux)
151 OPENSSL_free(ndef_aux);
152 return NULL;
153 }
154
155 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
156 {
157 NDEF_SUPPORT *ndef_aux;
158 unsigned char *p;
159 int derlen;
160
161 if (!parg)
162 return 0;
163
164 ndef_aux = *(NDEF_SUPPORT **)parg;
165
166 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
167 p = OPENSSL_malloc(derlen);
168 ndef_aux->derbuf = p;
169 *pbuf = p;
170 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
171
172 if (!*ndef_aux->boundary)
173 return 0;
174
175 *plen = *ndef_aux->boundary - *pbuf;
176
177 return 1;
178 }
179
180 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
181 {
182 NDEF_SUPPORT *ndef_aux;
183
184 if (!parg)
185 return 0;
186
187 ndef_aux = *(NDEF_SUPPORT **)parg;
188
189 if (ndef_aux->derbuf)
190 OPENSSL_free(ndef_aux->derbuf);
191
192 ndef_aux->derbuf = NULL;
193 *pbuf = NULL;
194 *plen = 0;
195 return 1;
196 }
197
198 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
199 {
200 NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
201 if (!ndef_prefix_free(b, pbuf, plen, parg))
202 return 0;
203 OPENSSL_free(*pndef_aux);
204 *pndef_aux = NULL;
205 return 1;
206 }
207
208 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
209 {
210 NDEF_SUPPORT *ndef_aux;
211 unsigned char *p;
212 int derlen;
213 const ASN1_AUX *aux;
214 ASN1_STREAM_ARG sarg;
215
216 if (!parg)
217 return 0;
218
219 ndef_aux = *(NDEF_SUPPORT **)parg;
220
221 aux = ndef_aux->it->funcs;
222
223 /* Finalize structures */
224 sarg.ndef_bio = ndef_aux->ndef_bio;
225 sarg.out = ndef_aux->out;
226 sarg.boundary = ndef_aux->boundary;
227 if (aux->asn1_cb(ASN1_OP_STREAM_POST,
228 &ndef_aux->val, ndef_aux->it, &sarg) <= 0)
229 return 0;
230
231 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
232 p = OPENSSL_malloc(derlen);
233 ndef_aux->derbuf = p;
234 *pbuf = p;
235 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
236
237 if (!*ndef_aux->boundary)
238 return 0;
239 *pbuf = *ndef_aux->boundary;
240 *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);
241
242 return 1;
243 }