1 /* $OpenBSD: bio_asn1.c,v 1.11 2015/02/10 09:52:35 miod Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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)
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49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
59 /* Experimental ASN1 BIO. When written through the data is converted
60 * to an ASN1 string type: default is OCTET STRING. Additional functions
61 * can be provided to add prefix and suffix data.
67 #include <openssl/bio.h>
68 #include <openssl/asn1.h>
70 /* Must be large enough for biggest tag+length */
71 #define DEFAULT_ASN1_BUF_SIZE 20
77 ASN1_STATE_HEADER_COPY,
83 typedef struct BIO_ASN1_EX_FUNCS_st {
84 asn1_ps_func *ex_func;
85 asn1_ps_func *ex_free_func;
88 typedef struct BIO_ASN1_BUF_CTX_t {
90 asn1_bio_state_t state;
95 /* Current position in buffer */
97 /* Current buffer length */
99 /* Amount of data to copy */
101 /* Class and tag to use */
102 int asn1_class, asn1_tag;
103 asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free;
104 /* Extra buffer for prefix and suffix data */
105 unsigned char *ex_buf;
112 static int asn1_bio_write(BIO *h, const char *buf, int num);
113 static int asn1_bio_read(BIO *h, char *buf, int size);
114 static int asn1_bio_puts(BIO *h, const char *str);
115 static int asn1_bio_gets(BIO *h, char *str, int size);
116 static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2);
117 static int asn1_bio_new(BIO *h);
118 static int asn1_bio_free(BIO *data);
119 static long asn1_bio_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
121 static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
122 static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
123 asn1_ps_func *cleanup, asn1_bio_state_t next);
124 static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
125 asn1_ps_func *setup, asn1_bio_state_t ex_state,
126 asn1_bio_state_t other_state);
128 static BIO_METHOD methods_asn1 = {
129 .type = BIO_TYPE_ASN1,
131 .bwrite = asn1_bio_write,
132 .bread = asn1_bio_read,
133 .bputs = asn1_bio_puts,
134 .bgets = asn1_bio_gets,
135 .ctrl = asn1_bio_ctrl,
136 .create = asn1_bio_new,
137 .destroy = asn1_bio_free,
138 .callback_ctrl = asn1_bio_callback_ctrl
144 return (&methods_asn1);
150 BIO_ASN1_BUF_CTX *ctx;
151 ctx = malloc(sizeof(BIO_ASN1_BUF_CTX));
154 if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE)) {
159 b->ptr = (char *)ctx;
165 asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
167 ctx->buf = malloc(size);
174 ctx->asn1_class = V_ASN1_UNIVERSAL;
175 ctx->asn1_tag = V_ASN1_OCTET_STRING;
179 ctx->state = ASN1_STATE_START;
184 asn1_bio_free(BIO *b)
186 BIO_ASN1_BUF_CTX *ctx;
188 ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
200 asn1_bio_write(BIO *b, const char *in , int inl)
202 BIO_ASN1_BUF_CTX *ctx;
203 int wrmax, wrlen, ret, buflen;
206 if (!in || (inl < 0) || (b->next_bio == NULL))
208 ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
216 switch (ctx->state) {
218 /* Setup prefix data, call it */
219 case ASN1_STATE_START:
220 if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
221 ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
225 /* Copy any pre data first */
226 case ASN1_STATE_PRE_COPY:
227 ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
233 case ASN1_STATE_HEADER:
234 buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
235 if (buflen <= 0 || buflen > ctx->bufsize)
237 ctx->buflen = buflen;
239 ASN1_put_object(&p, 0, inl,
240 ctx->asn1_tag, ctx->asn1_class);
242 ctx->state = ASN1_STATE_HEADER_COPY;
245 case ASN1_STATE_HEADER_COPY:
246 ret = BIO_write(b->next_bio,
247 ctx->buf + ctx->bufpos, ctx->buflen);
256 ctx->state = ASN1_STATE_DATA_COPY;
260 case ASN1_STATE_DATA_COPY:
262 if (inl > ctx->copylen)
263 wrmax = ctx->copylen;
266 ret = BIO_write(b->next_bio, in, wrmax);
274 if (ctx->copylen == 0)
275 ctx->state = ASN1_STATE_HEADER;
281 BIO_clear_retry_flags(b);
288 BIO_clear_retry_flags(b);
289 BIO_copy_next_retry(b);
291 return (wrlen > 0) ? wrlen : ret;
295 asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, asn1_ps_func *cleanup,
296 asn1_bio_state_t next)
300 if (ctx->ex_len <= 0)
303 ret = BIO_write(b->next_bio, ctx->ex_buf + ctx->ex_pos,
312 cleanup(b, &ctx->ex_buf, &ctx->ex_len,
323 asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, asn1_ps_func *setup,
324 asn1_bio_state_t ex_state, asn1_bio_state_t other_state)
326 if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg)) {
327 BIO_clear_retry_flags(b);
331 ctx->state = ex_state;
333 ctx->state = other_state;
338 asn1_bio_read(BIO *b, char *in , int inl)
342 return BIO_read(b->next_bio, in , inl);
346 asn1_bio_puts(BIO *b, const char *str)
348 return asn1_bio_write(b, str, strlen(str));
352 asn1_bio_gets(BIO *b, char *str, int size)
356 return BIO_gets(b->next_bio, str , size);
360 asn1_bio_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
362 if (b->next_bio == NULL)
364 return BIO_callback_ctrl(b->next_bio, cmd, fp);
368 asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2)
370 BIO_ASN1_BUF_CTX *ctx;
371 BIO_ASN1_EX_FUNCS *ex_func;
374 ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
379 case BIO_C_SET_PREFIX:
381 ctx->prefix = ex_func->ex_func;
382 ctx->prefix_free = ex_func->ex_free_func;
385 case BIO_C_GET_PREFIX:
387 ex_func->ex_func = ctx->prefix;
388 ex_func->ex_free_func = ctx->prefix_free;
391 case BIO_C_SET_SUFFIX:
393 ctx->suffix = ex_func->ex_func;
394 ctx->suffix_free = ex_func->ex_free_func;
397 case BIO_C_GET_SUFFIX:
399 ex_func->ex_func = ctx->suffix;
400 ex_func->ex_free_func = ctx->suffix_free;
403 case BIO_C_SET_EX_ARG:
407 case BIO_C_GET_EX_ARG:
408 *(void **)arg2 = ctx->ex_arg;
415 /* Call post function if possible */
416 if (ctx->state == ASN1_STATE_HEADER) {
417 if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
418 ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
422 if (ctx->state == ASN1_STATE_POST_COPY) {
423 ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
429 if (ctx->state == ASN1_STATE_DONE)
430 return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
432 BIO_clear_retry_flags(b);
441 return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
449 asn1_bio_set_ex(BIO *b, int cmd, asn1_ps_func *ex_func, asn1_ps_func
452 BIO_ASN1_EX_FUNCS extmp;
454 extmp.ex_func = ex_func;
455 extmp.ex_free_func = ex_free_func;
456 return BIO_ctrl(b, cmd, 0, &extmp);
460 asn1_bio_get_ex(BIO *b, int cmd, asn1_ps_func **ex_func,
461 asn1_ps_func **ex_free_func)
463 BIO_ASN1_EX_FUNCS extmp;
466 ret = BIO_ctrl(b, cmd, 0, &extmp);
468 *ex_func = extmp.ex_func;
469 *ex_free_func = extmp.ex_free_func;
475 BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix, asn1_ps_func *prefix_free)
477 return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
481 BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix, asn1_ps_func **pprefix_free)
483 return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
487 BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix, asn1_ps_func *suffix_free)
489 return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
493 BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix, asn1_ps_func **psuffix_free)
495 return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);