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source: vbox/trunk/src/libs/openssl-1.1.1l/crypto/comp/c_zlib.c@ 91772

Last change on this file since 91772 was 91772, checked in by vboxsync, 3 years ago

openssl-1.1.1l: Applied and adjusted our OpenSSL changes to 1.1.1l. bugref:10126
File size: 17.4 KB
Line 
1/*
2 * Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <stdlib.h>
12#include <string.h>
13#include <openssl/objects.h>
14#include "internal/comp.h"
15#include <openssl/err.h>
16#include "crypto/cryptlib.h"
17#include "internal/bio.h"
18#include "comp_local.h"
19
20COMP_METHOD *COMP_zlib(void);
21
22static COMP_METHOD zlib_method_nozlib = {
23 NID_undef,
24 "(undef)",
25 NULL,
26 NULL,
27 NULL,
28 NULL,
29};
30
31#ifndef ZLIB
32# undef ZLIB_SHARED
33#else
34
35# include <zlib.h>
36
37static int zlib_stateful_init(COMP_CTX *ctx);
38static void zlib_stateful_finish(COMP_CTX *ctx);
39static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
40 unsigned int olen, unsigned char *in,
41 unsigned int ilen);
42static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
43 unsigned int olen, unsigned char *in,
44 unsigned int ilen);
45
46/* memory allocations functions for zlib initialisation */
47static void *zlib_zalloc(void *opaque, unsigned int no, unsigned int size)
48{
49 void *p;
50
51 p = OPENSSL_zalloc(no * size);
52 return p;
53}
54
55static void zlib_zfree(void *opaque, void *address)
56{
57 OPENSSL_free(address);
58}
59
60
61static COMP_METHOD zlib_stateful_method = {
62 NID_zlib_compression,
63 LN_zlib_compression,
64 zlib_stateful_init,
65 zlib_stateful_finish,
66 zlib_stateful_compress_block,
67 zlib_stateful_expand_block
68};
69
70/*
71 * When OpenSSL is built on Windows, we do not want to require that
72 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
73 * work. Therefore, all ZLIB routines are loaded at run time
74 * and we do not link to a .LIB file when ZLIB_SHARED is set.
75 */
76# if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
77# include <windows.h>
78# endif /* !(OPENSSL_SYS_WINDOWS ||
79 * OPENSSL_SYS_WIN32) */
80
81# ifdef ZLIB_SHARED
82# include "internal/dso.h"
83
84/* Function pointers */
85typedef int (*compress_ft) (Bytef *dest, uLongf * destLen,
86 const Bytef *source, uLong sourceLen);
87typedef int (*inflateEnd_ft) (z_streamp strm);
88typedef int (*inflate_ft) (z_streamp strm, int flush);
89typedef int (*inflateInit__ft) (z_streamp strm,
90 const char *version, int stream_size);
91typedef int (*deflateEnd_ft) (z_streamp strm);
92typedef int (*deflate_ft) (z_streamp strm, int flush);
93typedef int (*deflateInit__ft) (z_streamp strm, int level,
94 const char *version, int stream_size);
95typedef const char *(*zError__ft) (int err);
96static compress_ft p_compress = NULL;
97static inflateEnd_ft p_inflateEnd = NULL;
98static inflate_ft p_inflate = NULL;
99static inflateInit__ft p_inflateInit_ = NULL;
100static deflateEnd_ft p_deflateEnd = NULL;
101static deflate_ft p_deflate = NULL;
102static deflateInit__ft p_deflateInit_ = NULL;
103static zError__ft p_zError = NULL;
104
105static int zlib_loaded = 0; /* only attempt to init func pts once */
106static DSO *zlib_dso = NULL;
107
108# define compress p_compress
109# define inflateEnd p_inflateEnd
110# define inflate p_inflate
111# define inflateInit_ p_inflateInit_
112# define deflateEnd p_deflateEnd
113# define deflate p_deflate
114# define deflateInit_ p_deflateInit_
115# define zError p_zError
116# endif /* ZLIB_SHARED */
117
118struct zlib_state {
119 z_stream istream;
120 z_stream ostream;
121};
122
123static int zlib_stateful_init(COMP_CTX *ctx)
124{
125 int err;
126 struct zlib_state *state = OPENSSL_zalloc(sizeof(*state));
127
128 if (state == NULL)
129 goto err;
130
131 state->istream.zalloc = zlib_zalloc;
132 state->istream.zfree = zlib_zfree;
133 state->istream.opaque = Z_NULL;
134 state->istream.next_in = Z_NULL;
135 state->istream.next_out = Z_NULL;
136 err = inflateInit_(&state->istream, ZLIB_VERSION, sizeof(z_stream));
137 if (err != Z_OK)
138 goto err;
139
140 state->ostream.zalloc = zlib_zalloc;
141 state->ostream.zfree = zlib_zfree;
142 state->ostream.opaque = Z_NULL;
143 state->ostream.next_in = Z_NULL;
144 state->ostream.next_out = Z_NULL;
145 err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION,
146 ZLIB_VERSION, sizeof(z_stream));
147 if (err != Z_OK)
148 goto err;
149
150 ctx->data = state;
151 return 1;
152 err:
153 OPENSSL_free(state);
154 return 0;
155}
156
157static void zlib_stateful_finish(COMP_CTX *ctx)
158{
159 struct zlib_state *state = ctx->data;
160 inflateEnd(&state->istream);
161 deflateEnd(&state->ostream);
162 OPENSSL_free(state);
163}
164
165static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
166 unsigned int olen, unsigned char *in,
167 unsigned int ilen)
168{
169 int err = Z_OK;
170 struct zlib_state *state = ctx->data;
171
172 if (state == NULL)
173 return -1;
174
175 state->ostream.next_in = in;
176 state->ostream.avail_in = ilen;
177 state->ostream.next_out = out;
178 state->ostream.avail_out = olen;
179 if (ilen > 0)
180 err = deflate(&state->ostream, Z_SYNC_FLUSH);
181 if (err != Z_OK)
182 return -1;
183 return olen - state->ostream.avail_out;
184}
185
186static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
187 unsigned int olen, unsigned char *in,
188 unsigned int ilen)
189{
190 int err = Z_OK;
191 struct zlib_state *state = ctx->data;
192
193 if (state == NULL)
194 return 0;
195
196 state->istream.next_in = in;
197 state->istream.avail_in = ilen;
198 state->istream.next_out = out;
199 state->istream.avail_out = olen;
200 if (ilen > 0)
201 err = inflate(&state->istream, Z_SYNC_FLUSH);
202 if (err != Z_OK)
203 return -1;
204 return olen - state->istream.avail_out;
205}
206
207#endif
208
209COMP_METHOD *COMP_zlib(void)
210{
211 COMP_METHOD *meth = &zlib_method_nozlib;
212
213#ifdef ZLIB_SHARED
214 /* LIBZ may be externally defined, and we should respect that value */
215# ifndef LIBZ
216# if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
217# define LIBZ "ZLIB1"
218# elif defined(OPENSSL_SYS_VMS)
219# define LIBZ "LIBZ"
220# else
221# define LIBZ "z"
222# endif
223# endif
224
225 if (!zlib_loaded) {
226 zlib_dso = DSO_load(NULL, LIBZ, NULL, 0);
227 if (zlib_dso != NULL) {
228 p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress");
229 p_inflateEnd
230 = (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd");
231 p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate");
232 p_inflateInit_
233 = (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_");
234 p_deflateEnd
235 = (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd");
236 p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate");
237 p_deflateInit_
238 = (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_");
239 p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError");
240
241 if (p_compress && p_inflateEnd && p_inflate
242 && p_inflateInit_ && p_deflateEnd
243 && p_deflate && p_deflateInit_ && p_zError)
244 zlib_loaded++;
245
246 if (!OPENSSL_init_crypto(OPENSSL_INIT_ZLIB, NULL)) {
247 comp_zlib_cleanup_int();
248 return meth;
249 }
250 if (zlib_loaded)
251 meth = &zlib_stateful_method;
252 }
253 }
254#endif
255#if defined(ZLIB)
256 meth = &zlib_stateful_method;
257#endif
258
259 return meth;
260}
261
262void comp_zlib_cleanup_int(void)
263{
264#ifdef ZLIB_SHARED
265 DSO_free(zlib_dso);
266 zlib_dso = NULL;
267#endif
268}
269
270#ifdef ZLIB
271
272/* Zlib based compression/decompression filter BIO */
273
274typedef struct {
275 unsigned char *ibuf; /* Input buffer */
276 int ibufsize; /* Buffer size */
277 z_stream zin; /* Input decompress context */
278 unsigned char *obuf; /* Output buffer */
279 int obufsize; /* Output buffer size */
280 unsigned char *optr; /* Position in output buffer */
281 int ocount; /* Amount of data in output buffer */
282 int odone; /* deflate EOF */
283 int comp_level; /* Compression level to use */
284 z_stream zout; /* Output compression context */
285} BIO_ZLIB_CTX;
286
287# define ZLIB_DEFAULT_BUFSIZE 1024
288
289static int bio_zlib_new(BIO *bi);
290static int bio_zlib_free(BIO *bi);
291static int bio_zlib_read(BIO *b, char *out, int outl);
292static int bio_zlib_write(BIO *b, const char *in, int inl);
293static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
294static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp);
295
296static const BIO_METHOD bio_meth_zlib = {
297 BIO_TYPE_COMP,
298 "zlib",
299 /* TODO: Convert to new style write function */
300 bwrite_conv,
301 bio_zlib_write,
302 /* TODO: Convert to new style read function */
303 bread_conv,
304 bio_zlib_read,
305 NULL, /* bio_zlib_puts, */
306 NULL, /* bio_zlib_gets, */
307 bio_zlib_ctrl,
308 bio_zlib_new,
309 bio_zlib_free,
310 bio_zlib_callback_ctrl
311};
312
313const BIO_METHOD *BIO_f_zlib(void)
314{
315 return &bio_meth_zlib;
316}
317
318static int bio_zlib_new(BIO *bi)
319{
320 BIO_ZLIB_CTX *ctx;
321# ifdef ZLIB_SHARED
322 (void)COMP_zlib();
323 if (!zlib_loaded) {
324 COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
325 return 0;
326 }
327# endif
328 ctx = OPENSSL_zalloc(sizeof(*ctx));
329 if (ctx == NULL) {
330 COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
331 return 0;
332 }
333 ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
334 ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
335 ctx->zin.zalloc = Z_NULL;
336 ctx->zin.zfree = Z_NULL;
337 ctx->zout.zalloc = Z_NULL;
338 ctx->zout.zfree = Z_NULL;
339 ctx->comp_level = Z_DEFAULT_COMPRESSION;
340 BIO_set_init(bi, 1);
341 BIO_set_data(bi, ctx);
342
343 return 1;
344}
345
346static int bio_zlib_free(BIO *bi)
347{
348 BIO_ZLIB_CTX *ctx;
349 if (!bi)
350 return 0;
351 ctx = BIO_get_data(bi);
352 if (ctx->ibuf) {
353 /* Destroy decompress context */
354 inflateEnd(&ctx->zin);
355 OPENSSL_free(ctx->ibuf);
356 }
357 if (ctx->obuf) {
358 /* Destroy compress context */
359 deflateEnd(&ctx->zout);
360 OPENSSL_free(ctx->obuf);
361 }
362 OPENSSL_free(ctx);
363 BIO_set_data(bi, NULL);
364 BIO_set_init(bi, 0);
365
366 return 1;
367}
368
369static int bio_zlib_read(BIO *b, char *out, int outl)
370{
371 BIO_ZLIB_CTX *ctx;
372 int ret;
373 z_stream *zin;
374 BIO *next = BIO_next(b);
375
376 if (!out || !outl)
377 return 0;
378 ctx = BIO_get_data(b);
379 zin = &ctx->zin;
380 BIO_clear_retry_flags(b);
381 if (!ctx->ibuf) {
382 ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
383 if (ctx->ibuf == NULL) {
384 COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
385 return 0;
386 }
387 inflateInit(zin);
388 zin->next_in = ctx->ibuf;
389 zin->avail_in = 0;
390 }
391
392 /* Copy output data directly to supplied buffer */
393 zin->next_out = (unsigned char *)out;
394 zin->avail_out = (unsigned int)outl;
395 for (;;) {
396 /* Decompress while data available */
397 while (zin->avail_in) {
398 ret = inflate(zin, 0);
399 if ((ret != Z_OK) && (ret != Z_STREAM_END)) {
400 COMPerr(COMP_F_BIO_ZLIB_READ, COMP_R_ZLIB_INFLATE_ERROR);
401 ERR_add_error_data(2, "zlib error:", zError(ret));
402 return 0;
403 }
404 /* If EOF or we've read everything then return */
405 if ((ret == Z_STREAM_END) || !zin->avail_out)
406 return outl - zin->avail_out;
407 }
408
409 /*
410 * No data in input buffer try to read some in, if an error then
411 * return the total data read.
412 */
413 ret = BIO_read(next, ctx->ibuf, ctx->ibufsize);
414 if (ret <= 0) {
415 /* Total data read */
416 int tot = outl - zin->avail_out;
417 BIO_copy_next_retry(b);
418 if (ret < 0)
419 return (tot > 0) ? tot : ret;
420 return tot;
421 }
422 zin->avail_in = ret;
423 zin->next_in = ctx->ibuf;
424 }
425}
426
427static int bio_zlib_write(BIO *b, const char *in, int inl)
428{
429 BIO_ZLIB_CTX *ctx;
430 int ret;
431 z_stream *zout;
432 BIO *next = BIO_next(b);
433
434 if (!in || !inl)
435 return 0;
436 ctx = BIO_get_data(b);
437 if (ctx->odone)
438 return 0;
439 zout = &ctx->zout;
440 BIO_clear_retry_flags(b);
441 if (!ctx->obuf) {
442 ctx->obuf = OPENSSL_malloc(ctx->obufsize);
443 /* Need error here */
444 if (ctx->obuf == NULL) {
445 COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
446 return 0;
447 }
448 ctx->optr = ctx->obuf;
449 ctx->ocount = 0;
450 deflateInit(zout, ctx->comp_level);
451 zout->next_out = ctx->obuf;
452 zout->avail_out = ctx->obufsize;
453 }
454 /* Obtain input data directly from supplied buffer */
455 zout->next_in = (void *)in;
456 zout->avail_in = inl;
457 for (;;) {
458 /* If data in output buffer write it first */
459 while (ctx->ocount) {
460 ret = BIO_write(next, ctx->optr, ctx->ocount);
461 if (ret <= 0) {
462 /* Total data written */
463 int tot = inl - zout->avail_in;
464 BIO_copy_next_retry(b);
465 if (ret < 0)
466 return (tot > 0) ? tot : ret;
467 return tot;
468 }
469 ctx->optr += ret;
470 ctx->ocount -= ret;
471 }
472
473 /* Have we consumed all supplied data? */
474 if (!zout->avail_in)
475 return inl;
476
477 /* Compress some more */
478
479 /* Reset buffer */
480 ctx->optr = ctx->obuf;
481 zout->next_out = ctx->obuf;
482 zout->avail_out = ctx->obufsize;
483 /* Compress some more */
484 ret = deflate(zout, 0);
485 if (ret != Z_OK) {
486 COMPerr(COMP_F_BIO_ZLIB_WRITE, COMP_R_ZLIB_DEFLATE_ERROR);
487 ERR_add_error_data(2, "zlib error:", zError(ret));
488 return 0;
489 }
490 ctx->ocount = ctx->obufsize - zout->avail_out;
491 }
492}
493
494static int bio_zlib_flush(BIO *b)
495{
496 BIO_ZLIB_CTX *ctx;
497 int ret;
498 z_stream *zout;
499 BIO *next = BIO_next(b);
500
501 ctx = BIO_get_data(b);
502 /* If no data written or already flush show success */
503 if (!ctx->obuf || (ctx->odone && !ctx->ocount))
504 return 1;
505 zout = &ctx->zout;
506 BIO_clear_retry_flags(b);
507 /* No more input data */
508 zout->next_in = NULL;
509 zout->avail_in = 0;
510 for (;;) {
511 /* If data in output buffer write it first */
512 while (ctx->ocount) {
513 ret = BIO_write(next, ctx->optr, ctx->ocount);
514 if (ret <= 0) {
515 BIO_copy_next_retry(b);
516 return ret;
517 }
518 ctx->optr += ret;
519 ctx->ocount -= ret;
520 }
521 if (ctx->odone)
522 return 1;
523
524 /* Compress some more */
525
526 /* Reset buffer */
527 ctx->optr = ctx->obuf;
528 zout->next_out = ctx->obuf;
529 zout->avail_out = ctx->obufsize;
530 /* Compress some more */
531 ret = deflate(zout, Z_FINISH);
532 if (ret == Z_STREAM_END)
533 ctx->odone = 1;
534 else if (ret != Z_OK) {
535 COMPerr(COMP_F_BIO_ZLIB_FLUSH, COMP_R_ZLIB_DEFLATE_ERROR);
536 ERR_add_error_data(2, "zlib error:", zError(ret));
537 return 0;
538 }
539 ctx->ocount = ctx->obufsize - zout->avail_out;
540 }
541}
542
543static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
544{
545 BIO_ZLIB_CTX *ctx;
546 int ret, *ip;
547 int ibs, obs;
548 BIO *next = BIO_next(b);
549
550 if (next == NULL)
551 return 0;
552 ctx = BIO_get_data(b);
553 switch (cmd) {
554
555 case BIO_CTRL_RESET:
556 ctx->ocount = 0;
557 ctx->odone = 0;
558 ret = 1;
559 break;
560
561 case BIO_CTRL_FLUSH:
562 ret = bio_zlib_flush(b);
563 if (ret > 0)
564 ret = BIO_flush(next);
565 break;
566
567 case BIO_C_SET_BUFF_SIZE:
568 ibs = -1;
569 obs = -1;
570 if (ptr != NULL) {
571 ip = ptr;
572 if (*ip == 0)
573 ibs = (int)num;
574 else
575 obs = (int)num;
576 } else {
577 ibs = (int)num;
578 obs = ibs;
579 }
580
581 if (ibs != -1) {
582 OPENSSL_free(ctx->ibuf);
583 ctx->ibuf = NULL;
584 ctx->ibufsize = ibs;
585 }
586
587 if (obs != -1) {
588 OPENSSL_free(ctx->obuf);
589 ctx->obuf = NULL;
590 ctx->obufsize = obs;
591 }
592 ret = 1;
593 break;
594
595 case BIO_C_DO_STATE_MACHINE:
596 BIO_clear_retry_flags(b);
597 ret = BIO_ctrl(next, cmd, num, ptr);
598 BIO_copy_next_retry(b);
599 break;
600
601 case BIO_CTRL_WPENDING:
602 if (ctx->obuf == NULL)
603 return 0;
604
605 if (ctx->odone) {
606 ret = ctx->ocount;
607 } else {
608 ret = ctx->ocount;
609 if (ret == 0)
610 /* Unknown amount pending but we are not finished */
611 ret = 1;
612 }
613 if (ret == 0)
614 ret = BIO_ctrl(next, cmd, num, ptr);
615 break;
616
617 case BIO_CTRL_PENDING:
618 ret = ctx->zin.avail_in;
619 if (ret == 0)
620 ret = BIO_ctrl(next, cmd, num, ptr);
621 break;
622
623 default:
624 ret = BIO_ctrl(next, cmd, num, ptr);
625 break;
626
627 }
628
629 return ret;
630}
631
632static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
633{
634 BIO *next = BIO_next(b);
635 if (next == NULL)
636 return 0;
637 return BIO_callback_ctrl(next, cmd, fp);
638}
639
640#endif
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