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
65static int ber_write(BIO *h,char *buf,int num);
66static 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); */
69static long ber_ctrl(BIO *h,int cmd,long arg1,char *arg2);
70static int ber_new(BIO *h);
71static int ber_free(BIO *data);
72static 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. */
76typedef 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
86typedef 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
109static 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
122BIO_METHOD *BIO_f_ber(void)
123	{
124	return(&methods_ber);
125	}
126
127static 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
142static 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
156int 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_get_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
226static 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
240again:
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
273static 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
328static 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 */
364again:
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
414static 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/*
429void BIO_set_cipher_ctx(b,c)
430BIO *b;
431EVP_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
448void 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