1 /* crypto/evp/bio_ber.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include <errno.h>
61 #include "cryptlib.h"
62 #include <openssl/buffer.h>
63 #include <openssl/evp.h>
64
65 static int ber_write(BIO *h,char *buf,int num);
66 static int ber_read(BIO *h,char *buf,int size);
67 /*static int ber_puts(BIO *h,char *str); */
68 /*static int ber_gets(BIO *h,char *str,int size); */
69 static long ber_ctrl(BIO *h,int cmd,long arg1,char *arg2);
70 static int ber_new(BIO *h);
71 static int ber_free(BIO *data);
72 static long ber_callback_ctrl(BIO *h,int cmd,void *(*fp)());
73 #define BER_BUF_SIZE (32)
74
75 /* This is used to hold the state of the BER objects being read. */
76 typedef struct ber_struct
77 {
78 int tag;
79 int class;
80 long length;
81 int inf;
82 int num_left;
83 int depth;
84 } BER_CTX;
85
86 typedef struct bio_ber_struct
87 {
88 int tag;
89 int class;
90 long length;
91 int inf;
92
93 /* most of the following are used when doing non-blocking IO */
94 /* reading */
95 long num_left; /* number of bytes still to read/write in block */
96 int depth; /* used with indefinite encoding. */
97 int finished; /* No more read data */
98
99 /* writting */
100 char *w_addr;
101 int w_offset;
102 int w_left;
103
104 int buf_len;
105 int buf_off;
106 unsigned char buf[BER_BUF_SIZE];
107 } BIO_BER_CTX;
108
109 static BIO_METHOD methods_ber=
110 {
111 BIO_TYPE_CIPHER,"cipher",
112 ber_write,
113 ber_read,
114 NULL, /* ber_puts, */
115 NULL, /* ber_gets, */
116 ber_ctrl,
117 ber_new,
118 ber_free,
119 ber_callback_ctrl,
120 };
121
BIO_f_ber(void)122 BIO_METHOD *BIO_f_ber(void)
123 {
124 return(&methods_ber);
125 }
126
ber_new(BIO * bi)127 static int ber_new(BIO *bi)
128 {
129 BIO_BER_CTX *ctx;
130
131 ctx=(BIO_BER_CTX *)OPENSSL_malloc(sizeof(BIO_BER_CTX));
132 if (ctx == NULL) return(0);
133
134 memset((char *)ctx,0,sizeof(BIO_BER_CTX));
135
136 bi->init=0;
137 bi->ptr=(char *)ctx;
138 bi->flags=0;
139 return(1);
140 }
141
ber_free(BIO * a)142 static int ber_free(BIO *a)
143 {
144 BIO_BER_CTX *b;
145
146 if (a == NULL) return(0);
147 b=(BIO_BER_CTX *)a->ptr;
148 OPENSSL_cleanse(a->ptr,sizeof(BIO_BER_CTX));
149 OPENSSL_free(a->ptr);
150 a->ptr=NULL;
151 a->init=0;
152 a->flags=0;
153 return(1);
154 }
155
bio_ber_get_header(BIO * bio,BIO_BER_CTX * ctx)156 int bio_ber_get_header(BIO *bio, BIO_BER_CTX *ctx)
157 {
158 char buf[64];
159 int i,j,n;
160 int ret;
161 unsigned char *p;
162 unsigned long length
163 int tag;
164 int class;
165 long max;
166
167 BIO_clear_retry_flags(b);
168
169 /* Pack the buffer down if there is a hole at the front */
170 if (ctx->buf_off != 0)
171 {
172 p=ctx->buf;
173 j=ctx->buf_off;
174 n=ctx->buf_len-j;
175 for (i=0; i<n; i++)
176 {
177 p[0]=p[j];
178 p++;
179 }
180 ctx->buf_len-j;
181 ctx->buf_off=0;
182 }
183
184 /* If there is more room, read some more data */
185 i=BER_BUF_SIZE-ctx->buf_len;
186 if (i)
187 {
188 i=BIO_read(bio->next_bio,&(ctx->buf[ctx->buf_len]),i);
189 if (i <= 0)
190 {
191 BIO_copy_next_retry(b);
192 return(i);
193 }
194 else
195 ctx->buf_len+=i;
196 }
197
198 max=ctx->buf_len;
199 p=ctx->buf;
200 ret=ASN1_get_object(&p,&length,&tag,&class,max);
201
202 if (ret & 0x80)
203 {
204 if ((ctx->buf_len < BER_BUF_SIZE) &&
205 (ERR_GET_REASON(ERR_peek_error()) == ASN1_R_TOO_LONG))
206 {
207 ERR_clear_error(); /* clear the error */
208 BIO_set_retry_read(b);
209 }
210 return(-1);
211 }
212
213 /* We have no error, we have a header, so make use of it */
214
215 if ((ctx->tag >= 0) && (ctx->tag != tag))
216 {
217 BIOerr(BIO_F_BIO_BER_GET_HEADER,BIO_R_TAG_MISMATCH);
218 sprintf(buf,"tag=%d, got %d",ctx->tag,tag);
219 ERR_add_error_data(1,buf);
220 return(-1);
221 }
222 if (ret & 0x01)
223 if (ret & V_ASN1_CONSTRUCTED)
224 }
225
ber_read(BIO * b,char * out,int outl)226 static int ber_read(BIO *b, char *out, int outl)
227 {
228 int ret=0,i,n;
229 BIO_BER_CTX *ctx;
230
231 BIO_clear_retry_flags(b);
232
233 if (out == NULL) return(0);
234 ctx=(BIO_BER_CTX *)b->ptr;
235
236 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
237
238 if (ctx->finished) return(0);
239
240 again:
241 /* First see if we are half way through reading a block */
242 if (ctx->num_left > 0)
243 {
244 if (ctx->num_left < outl)
245 n=ctx->num_left;
246 else
247 n=outl;
248 i=BIO_read(b->next_bio,out,n);
249 if (i <= 0)
250 {
251 BIO_copy_next_retry(b);
252 return(i);
253 }
254 ctx->num_left-=i;
255 outl-=i;
256 ret+=i;
257 if (ctx->num_left <= 0)
258 {
259 ctx->depth--;
260 if (ctx->depth <= 0)
261 ctx->finished=1;
262 }
263 if (outl <= 0)
264 return(ret);
265 else
266 goto again;
267 }
268 else /* we need to read another BER header */
269 {
270 }
271 }
272
ber_write(BIO * b,char * in,int inl)273 static int ber_write(BIO *b, char *in, int inl)
274 {
275 int ret=0,n,i;
276 BIO_ENC_CTX *ctx;
277
278 ctx=(BIO_ENC_CTX *)b->ptr;
279 ret=inl;
280
281 BIO_clear_retry_flags(b);
282 n=ctx->buf_len-ctx->buf_off;
283 while (n > 0)
284 {
285 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
286 if (i <= 0)
287 {
288 BIO_copy_next_retry(b);
289 return(i);
290 }
291 ctx->buf_off+=i;
292 n-=i;
293 }
294 /* at this point all pending data has been written */
295
296 if ((in == NULL) || (inl <= 0)) return(0);
297
298 ctx->buf_off=0;
299 while (inl > 0)
300 {
301 n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl;
302 EVP_CipherUpdate(&(ctx->cipher),
303 (unsigned char *)ctx->buf,&ctx->buf_len,
304 (unsigned char *)in,n);
305 inl-=n;
306 in+=n;
307
308 ctx->buf_off=0;
309 n=ctx->buf_len;
310 while (n > 0)
311 {
312 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
313 if (i <= 0)
314 {
315 BIO_copy_next_retry(b);
316 return(i);
317 }
318 n-=i;
319 ctx->buf_off+=i;
320 }
321 ctx->buf_len=0;
322 ctx->buf_off=0;
323 }
324 BIO_copy_next_retry(b);
325 return(ret);
326 }
327
ber_ctrl(BIO * b,int cmd,long num,char * ptr)328 static long ber_ctrl(BIO *b, int cmd, long num, char *ptr)
329 {
330 BIO *dbio;
331 BIO_ENC_CTX *ctx,*dctx;
332 long ret=1;
333 int i;
334
335 ctx=(BIO_ENC_CTX *)b->ptr;
336
337 switch (cmd)
338 {
339 case BIO_CTRL_RESET:
340 ctx->ok=1;
341 ctx->finished=0;
342 EVP_CipherInit_ex(&(ctx->cipher),NULL,NULL,NULL,NULL,
343 ctx->cipher.berrypt);
344 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
345 break;
346 case BIO_CTRL_EOF: /* More to read */
347 if (ctx->cont <= 0)
348 ret=1;
349 else
350 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
351 break;
352 case BIO_CTRL_WPENDING:
353 ret=ctx->buf_len-ctx->buf_off;
354 if (ret <= 0)
355 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
356 break;
357 case BIO_CTRL_PENDING: /* More to read in buffer */
358 ret=ctx->buf_len-ctx->buf_off;
359 if (ret <= 0)
360 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
361 break;
362 case BIO_CTRL_FLUSH:
363 /* do a final write */
364 again:
365 while (ctx->buf_len != ctx->buf_off)
366 {
367 i=ber_write(b,NULL,0);
368 if (i < 0)
369 {
370 ret=i;
371 break;
372 }
373 }
374
375 if (!ctx->finished)
376 {
377 ctx->finished=1;
378 ctx->buf_off=0;
379 ret=EVP_CipherFinal_ex(&(ctx->cipher),
380 (unsigned char *)ctx->buf,
381 &(ctx->buf_len));
382 ctx->ok=(int)ret;
383 if (ret <= 0) break;
384
385 /* push out the bytes */
386 goto again;
387 }
388
389 /* Finally flush the underlying BIO */
390 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
391 break;
392 case BIO_C_GET_CIPHER_STATUS:
393 ret=(long)ctx->ok;
394 break;
395 case BIO_C_DO_STATE_MACHINE:
396 BIO_clear_retry_flags(b);
397 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
398 BIO_copy_next_retry(b);
399 break;
400
401 case BIO_CTRL_DUP:
402 dbio=(BIO *)ptr;
403 dctx=(BIO_ENC_CTX *)dbio->ptr;
404 memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher));
405 dbio->init=1;
406 break;
407 default:
408 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
409 break;
410 }
411 return(ret);
412 }
413
ber_callback_ctrl(BIO * b,int cmd,void * (* fp)())414 static long ber_callback_ctrl(BIO *b, int cmd, void *(*fp)())
415 {
416 long ret=1;
417
418 if (b->next_bio == NULL) return(0);
419 switch (cmd)
420 {
421 default:
422 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
423 break;
424 }
425 return(ret);
426 }
427
428 /*
429 void BIO_set_cipher_ctx(b,c)
430 BIO *b;
431 EVP_CIPHER_ctx *c;
432 {
433 if (b == NULL) return;
434
435 if ((b->callback != NULL) &&
436 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
437 return;
438
439 b->init=1;
440 ctx=(BIO_ENC_CTX *)b->ptr;
441 memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
442
443 if (b->callback != NULL)
444 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
445 }
446 */
447
BIO_set_cipher(BIO * b,EVP_CIPHER * c,unsigned char * k,unsigned char * i,int e)448 void BIO_set_cipher(BIO *b, EVP_CIPHER *c, unsigned char *k, unsigned char *i,
449 int e)
450 {
451 BIO_ENC_CTX *ctx;
452
453 if (b == NULL) return;
454
455 if ((b->callback != NULL) &&
456 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
457 return;
458
459 b->init=1;
460 ctx=(BIO_ENC_CTX *)b->ptr;
461 EVP_CipherInit_ex(&(ctx->cipher),c,NULL,k,i,e);
462
463 if (b->callback != NULL)
464 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
465 }
466
467