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 <assert.h>
60 #include <string.h>
61
62 #include <openssl/bio.h>
63 #include <openssl/mem.h>
64
65
66 /* Must be large enough for biggest tag+length */
67 #define DEFAULT_ASN1_BUF_SIZE 20
68
69 typedef enum
70 {
71 ASN1_STATE_START,
72 ASN1_STATE_PRE_COPY,
73 ASN1_STATE_HEADER,
74 ASN1_STATE_HEADER_COPY,
75 ASN1_STATE_DATA_COPY,
76 ASN1_STATE_POST_COPY,
77 ASN1_STATE_DONE
78 } asn1_bio_state_t;
79
80 typedef struct BIO_ASN1_EX_FUNCS_st
81 {
82 asn1_ps_func *ex_func;
83 asn1_ps_func *ex_free_func;
84 } BIO_ASN1_EX_FUNCS;
85
86 typedef struct BIO_ASN1_BUF_CTX_t
87 {
88 /* Internal state */
89 asn1_bio_state_t state;
90 /* Internal buffer */
91 unsigned char *buf;
92 /* Size of buffer */
93 int bufsize;
94 /* Current position in buffer */
95 int bufpos;
96 /* Current buffer length */
97 int buflen;
98 /* Amount of data to copy */
99 int copylen;
100 /* Class and tag to use */
101 int asn1_class, asn1_tag;
102 asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free;
103 /* Extra buffer for prefix and suffix data */
104 unsigned char *ex_buf;
105 int ex_len;
106 int ex_pos;
107 void *ex_arg;
108 } BIO_ASN1_BUF_CTX;
109
110
111 static int asn1_bio_write(BIO *h, const char *buf,int num);
112 static int asn1_bio_read(BIO *h, char *buf, int size);
113 static int asn1_bio_puts(BIO *h, const char *str);
114 static int asn1_bio_gets(BIO *h, char *str, int size);
115 static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2);
116 static int asn1_bio_new(BIO *h);
117 static int asn1_bio_free(BIO *data);
118 static long asn1_bio_callback_ctrl(BIO *h, int cmd, bio_info_cb fp);
119
120 static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
121 static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
122 asn1_ps_func *cleanup, asn1_bio_state_t next);
123 static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
124 asn1_ps_func *setup,
125 asn1_bio_state_t ex_state,
126 asn1_bio_state_t other_state);
127
128 static const BIO_METHOD methods_asn1=
129 {
130 BIO_TYPE_ASN1,
131 "asn1",
132 asn1_bio_write,
133 asn1_bio_read,
134 asn1_bio_puts,
135 asn1_bio_gets,
136 asn1_bio_ctrl,
137 asn1_bio_new,
138 asn1_bio_free,
139 asn1_bio_callback_ctrl,
140 };
141
BIO_f_asn1(void)142 const BIO_METHOD *BIO_f_asn1(void)
143 {
144 return(&methods_asn1);
145 }
146
147
asn1_bio_new(BIO * b)148 static int asn1_bio_new(BIO *b)
149 {
150 BIO_ASN1_BUF_CTX *ctx;
151 ctx = OPENSSL_malloc(sizeof(BIO_ASN1_BUF_CTX));
152 if (!ctx)
153 return 0;
154 if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE))
155 {
156 OPENSSL_free(ctx);
157 return 0;
158 }
159 b->init = 1;
160 b->ptr = (char *)ctx;
161 b->flags = 0;
162 return 1;
163 }
164
asn1_bio_init(BIO_ASN1_BUF_CTX * ctx,int size)165 static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
166 {
167 ctx->buf = OPENSSL_malloc(size);
168 if (!ctx->buf)
169 return 0;
170 ctx->bufsize = size;
171 ctx->bufpos = 0;
172 ctx->buflen = 0;
173 ctx->copylen = 0;
174 ctx->asn1_class = V_ASN1_UNIVERSAL;
175 ctx->asn1_tag = V_ASN1_OCTET_STRING;
176 ctx->ex_buf = 0;
177 ctx->ex_pos = 0;
178 ctx->ex_len = 0;
179 ctx->state = ASN1_STATE_START;
180 return 1;
181 }
182
asn1_bio_free(BIO * b)183 static int asn1_bio_free(BIO *b)
184 {
185 BIO_ASN1_BUF_CTX *ctx;
186 ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
187 if (ctx == NULL)
188 return 0;
189 if (ctx->buf)
190 OPENSSL_free(ctx->buf);
191 OPENSSL_free(ctx);
192 b->init = 0;
193 b->ptr = NULL;
194 b->flags = 0;
195 return 1;
196 }
197
asn1_bio_write(BIO * b,const char * in,int inl)198 static int asn1_bio_write(BIO *b, const char *in , int inl)
199 {
200 BIO_ASN1_BUF_CTX *ctx;
201 int wrmax, wrlen, ret;
202 unsigned char *p;
203 if (!in || (inl < 0) || (b->next_bio == NULL))
204 return 0;
205 ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
206 if (ctx == NULL)
207 return 0;
208
209 wrlen = 0;
210 ret = -1;
211
212 for(;;)
213 {
214 switch (ctx->state)
215 {
216
217 /* Setup prefix data, call it */
218 case ASN1_STATE_START:
219 if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
220 ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
221 return 0;
222 break;
223
224 /* Copy any pre data first */
225 case ASN1_STATE_PRE_COPY:
226
227 ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
228 ASN1_STATE_HEADER);
229
230 if (ret <= 0)
231 goto done;
232
233 break;
234
235 case ASN1_STATE_HEADER:
236 ctx->buflen =
237 ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
238 assert(ctx->buflen <= ctx->bufsize);
239 p = ctx->buf;
240 ASN1_put_object(&p, 0, inl,
241 ctx->asn1_tag, ctx->asn1_class);
242 ctx->copylen = inl;
243 ctx->state = ASN1_STATE_HEADER_COPY;
244
245 break;
246
247 case ASN1_STATE_HEADER_COPY:
248 ret = BIO_write(b->next_bio,
249 ctx->buf + ctx->bufpos, ctx->buflen);
250 if (ret <= 0)
251 goto done;
252
253 ctx->buflen -= ret;
254 if (ctx->buflen)
255 ctx->bufpos += ret;
256 else
257 {
258 ctx->bufpos = 0;
259 ctx->state = ASN1_STATE_DATA_COPY;
260 }
261
262 break;
263
264 case ASN1_STATE_DATA_COPY:
265
266 if (inl > ctx->copylen)
267 wrmax = ctx->copylen;
268 else
269 wrmax = inl;
270 ret = BIO_write(b->next_bio, in, wrmax);
271 if (ret <= 0)
272 break;
273 wrlen += ret;
274 ctx->copylen -= ret;
275 in += ret;
276 inl -= ret;
277
278 if (ctx->copylen == 0)
279 ctx->state = ASN1_STATE_HEADER;
280
281 if (inl == 0)
282 goto done;
283
284 break;
285
286 default:
287 BIO_clear_retry_flags(b);
288 return 0;
289
290 }
291
292 }
293
294 done:
295 BIO_clear_retry_flags(b);
296 BIO_copy_next_retry(b);
297
298 return (wrlen > 0) ? wrlen : ret;
299
300 }
301
asn1_bio_flush_ex(BIO * b,BIO_ASN1_BUF_CTX * ctx,asn1_ps_func * cleanup,asn1_bio_state_t next)302 static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
303 asn1_ps_func *cleanup, asn1_bio_state_t next)
304 {
305 int ret;
306 if (ctx->ex_len <= 0)
307 return 1;
308 for(;;)
309 {
310 ret = BIO_write(b->next_bio, ctx->ex_buf + ctx->ex_pos,
311 ctx->ex_len);
312 if (ret <= 0)
313 break;
314 ctx->ex_len -= ret;
315 if (ctx->ex_len > 0)
316 ctx->ex_pos += ret;
317 else
318 {
319 if(cleanup)
320 cleanup(b, &ctx->ex_buf, &ctx->ex_len,
321 &ctx->ex_arg);
322 ctx->state = next;
323 ctx->ex_pos = 0;
324 break;
325 }
326 }
327 return ret;
328 }
329
asn1_bio_setup_ex(BIO * b,BIO_ASN1_BUF_CTX * ctx,asn1_ps_func * setup,asn1_bio_state_t ex_state,asn1_bio_state_t other_state)330 static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
331 asn1_ps_func *setup,
332 asn1_bio_state_t ex_state,
333 asn1_bio_state_t other_state)
334 {
335 if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg))
336 {
337 BIO_clear_retry_flags(b);
338 return 0;
339 }
340 if (ctx->ex_len > 0)
341 ctx->state = ex_state;
342 else
343 ctx->state = other_state;
344 return 1;
345 }
346
asn1_bio_read(BIO * b,char * in,int inl)347 static int asn1_bio_read(BIO *b, char *in , int inl)
348 {
349 if (!b->next_bio)
350 return 0;
351 return BIO_read(b->next_bio, in , inl);
352 }
353
asn1_bio_puts(BIO * b,const char * str)354 static int asn1_bio_puts(BIO *b, const char *str)
355 {
356 return asn1_bio_write(b, str, strlen(str));
357 }
358
asn1_bio_gets(BIO * b,char * str,int size)359 static int asn1_bio_gets(BIO *b, char *str, int size)
360 {
361 if (!b->next_bio)
362 return 0;
363 return BIO_gets(b->next_bio, str , size);
364 }
365
asn1_bio_callback_ctrl(BIO * b,int cmd,bio_info_cb fp)366 static long asn1_bio_callback_ctrl(BIO *b, int cmd, bio_info_cb fp)
367 {
368 if (b->next_bio == NULL) return(0);
369 return BIO_callback_ctrl(b->next_bio,cmd,fp);
370 }
371
asn1_bio_ctrl(BIO * b,int cmd,long arg1,void * arg2)372 static long asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2)
373 {
374 BIO_ASN1_BUF_CTX *ctx;
375 BIO_ASN1_EX_FUNCS *ex_func;
376 long ret = 1;
377 ctx = (BIO_ASN1_BUF_CTX *) b->ptr;
378 if (ctx == NULL)
379 return 0;
380 switch(cmd)
381 {
382
383 case BIO_C_SET_PREFIX:
384 ex_func = arg2;
385 ctx->prefix = ex_func->ex_func;
386 ctx->prefix_free = ex_func->ex_free_func;
387 break;
388
389 case BIO_C_GET_PREFIX:
390 ex_func = arg2;
391 ex_func->ex_func = ctx->prefix;
392 ex_func->ex_free_func = ctx->prefix_free;
393 break;
394
395 case BIO_C_SET_SUFFIX:
396 ex_func = arg2;
397 ctx->suffix = ex_func->ex_func;
398 ctx->suffix_free = ex_func->ex_free_func;
399 break;
400
401 case BIO_C_GET_SUFFIX:
402 ex_func = arg2;
403 ex_func->ex_func = ctx->suffix;
404 ex_func->ex_free_func = ctx->suffix_free;
405 break;
406
407 case BIO_C_SET_EX_ARG:
408 ctx->ex_arg = arg2;
409 break;
410
411 case BIO_C_GET_EX_ARG:
412 *(void **)arg2 = ctx->ex_arg;
413 break;
414
415 case BIO_CTRL_FLUSH:
416 if (!b->next_bio)
417 return 0;
418
419 /* Call post function if possible */
420 if (ctx->state == ASN1_STATE_HEADER)
421 {
422 if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
423 ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
424 return 0;
425 }
426
427 if (ctx->state == ASN1_STATE_POST_COPY)
428 {
429 ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
430 ASN1_STATE_DONE);
431 if (ret <= 0)
432 return ret;
433 }
434
435 if (ctx->state == ASN1_STATE_DONE)
436 return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
437 else
438 {
439 BIO_clear_retry_flags(b);
440 return 0;
441 }
442 break;
443
444
445 default:
446 if (!b->next_bio)
447 return 0;
448 return BIO_ctrl(b->next_bio, cmd, arg1, arg2);
449
450 }
451
452 return ret;
453 }
454
asn1_bio_set_ex(BIO * b,int cmd,asn1_ps_func * ex_func,asn1_ps_func * ex_free_func)455 static int asn1_bio_set_ex(BIO *b, int cmd,
456 asn1_ps_func *ex_func, asn1_ps_func *ex_free_func)
457 {
458 BIO_ASN1_EX_FUNCS extmp;
459 extmp.ex_func = ex_func;
460 extmp.ex_free_func = ex_free_func;
461 return BIO_ctrl(b, cmd, 0, &extmp);
462 }
463
asn1_bio_get_ex(BIO * b,int cmd,asn1_ps_func ** ex_func,asn1_ps_func ** ex_free_func)464 static int asn1_bio_get_ex(BIO *b, int cmd,
465 asn1_ps_func **ex_func, asn1_ps_func **ex_free_func)
466 {
467 BIO_ASN1_EX_FUNCS extmp;
468 int ret;
469 ret = BIO_ctrl(b, cmd, 0, &extmp);
470 if (ret > 0)
471 {
472 *ex_func = extmp.ex_func;
473 *ex_free_func = extmp.ex_free_func;
474 }
475 return ret;
476 }
477
BIO_asn1_set_prefix(BIO * b,asn1_ps_func * prefix,asn1_ps_func * prefix_free)478 int BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix, asn1_ps_func *prefix_free)
479 {
480 return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
481 }
482
BIO_asn1_get_prefix(BIO * b,asn1_ps_func ** pprefix,asn1_ps_func ** pprefix_free)483 int BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix, asn1_ps_func **pprefix_free)
484 {
485 return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
486 }
487
BIO_asn1_set_suffix(BIO * b,asn1_ps_func * suffix,asn1_ps_func * suffix_free)488 int BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix, asn1_ps_func *suffix_free)
489 {
490 return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
491 }
492
BIO_asn1_get_suffix(BIO * b,asn1_ps_func ** psuffix,asn1_ps_func ** psuffix_free)493 int BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix, asn1_ps_func **psuffix_free)
494 {
495 return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);
496 }
497