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select.2: timeout is restrict too.
[dragonfly.git] / contrib / libarchive / libarchive / archive_read_support_format_zip.c
blob0a0be96b5990ba0a7837fb9e53dd744900864d51
1 /*-
2 * Copyright (c) 2004-2013 Tim Kientzle
3 * Copyright (c) 2011-2012,2014 Michihiro NAKAJIMA
4 * Copyright (c) 2013 Konrad Kleine
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "archive_platform.h"
29 __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_zip.c 201102 2009-12-28 03:11:36Z kientzle $");
30
31 /*
32 * The definitive documentation of the Zip file format is:
33 * http://www.pkware.com/documents/casestudies/APPNOTE.TXT
34 *
35 * The Info-Zip project has pioneered various extensions to better
36 * support Zip on Unix, including the 0x5455 "UT", 0x5855 "UX", 0x7855
37 * "Ux", and 0x7875 "ux" extensions for time and ownership
38 * information.
39 *
40 * History of this code: The streaming Zip reader was first added to
41 * libarchive in January 2005. Support for seekable input sources was
42 * added in Nov 2011. Zip64 support (including a significant code
43 * refactoring) was added in 2014.
44 */
45
46 #ifdef HAVE_ERRNO_H
47 #include <errno.h>
48 #endif
49 #ifdef HAVE_STDLIB_H
50 #include <stdlib.h>
51 #endif
52 #ifdef HAVE_ZLIB_H
53 #include <zlib.h>
54 #endif
55
56 #include "archive.h"
57 #include "archive_digest_private.h"
58 #include "archive_cryptor_private.h"
59 #include "archive_endian.h"
60 #include "archive_entry.h"
61 #include "archive_entry_locale.h"
62 #include "archive_hmac_private.h"
63 #include "archive_private.h"
64 #include "archive_rb.h"
65 #include "archive_read_private.h"
66
67 #ifndef HAVE_ZLIB_H
68 #include "archive_crc32.h"
69 #endif
70
71 struct zip_entry {
72 struct archive_rb_node node;
73 struct zip_entry *next;
74 int64_t local_header_offset;
75 int64_t compressed_size;
76 int64_t uncompressed_size;
77 int64_t gid;
78 int64_t uid;
79 struct archive_string rsrcname;
80 time_t mtime;
81 time_t atime;
82 time_t ctime;
83 uint32_t crc32;
84 uint16_t mode;
85 uint16_t zip_flags; /* From GP Flags Field */
86 unsigned char compression;
87 unsigned char system; /* From "version written by" */
88 unsigned char flags; /* Our extra markers. */
89 unsigned char decdat;/* Used for Decryption check */
90
91 /* WinZip AES encryption extra field should be available
92 * when compression is 99. */
93 struct {
94 /* Vendor version: AE-1 - 0x0001, AE-2 - 0x0002 */
95 unsigned vendor;
96 #define AES_VENDOR_AE_1 0x0001
97 #define AES_VENDOR_AE_2 0x0002
98 /* AES encryption strength:
99 * 1 - 128 bits, 2 - 192 bits, 2 - 256 bits. */
100 unsigned strength;
101 /* Actual compression method. */
102 unsigned char compression;
103 } aes_extra;
104 };
105
106 struct trad_enc_ctx {
107 uint32_t keys[3];
108 };
109
110 /* Bits used in zip_flags. */
111 #define ZIP_ENCRYPTED (1 << 0)
112 #define ZIP_LENGTH_AT_END (1 << 3)
113 #define ZIP_STRONG_ENCRYPTED (1 << 6)
114 #define ZIP_UTF8_NAME (1 << 11)
115 /* See "7.2 Single Password Symmetric Encryption Method"
116 in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */
117 #define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13)
118
119 /* Bits used in flags. */
120 #define LA_USED_ZIP64 (1 << 0)
121 #define LA_FROM_CENTRAL_DIRECTORY (1 << 1)
122
123 /*
124 * See "WinZip - AES Encryption Information"
125 * http://www.winzip.com/aes_info.htm
126 */
127 /* Value used in compression method. */
128 #define WINZIP_AES_ENCRYPTION 99
129 /* Authentication code size. */
130 #define AUTH_CODE_SIZE 10
131 /**/
132 #define MAX_DERIVED_KEY_BUF_SIZE (AES_MAX_KEY_SIZE * 2 + 2)
133
134 struct zip {
135 /* Structural information about the archive. */
136 struct archive_string format_name;
137 int64_t central_directory_offset;
138 size_t central_directory_entries_total;
139 size_t central_directory_entries_on_this_disk;
140 int has_encrypted_entries;
141
142 /* List of entries (seekable Zip only) */
143 struct zip_entry *zip_entries;
144 struct archive_rb_tree tree;
145 struct archive_rb_tree tree_rsrc;
146
147 /* Bytes read but not yet consumed via __archive_read_consume() */
148 size_t unconsumed;
149
150 /* Information about entry we're currently reading. */
151 struct zip_entry *entry;
152 int64_t entry_bytes_remaining;
153
154 /* These count the number of bytes actually read for the entry. */
155 int64_t entry_compressed_bytes_read;
156 int64_t entry_uncompressed_bytes_read;
157
158 /* Running CRC32 of the decompressed data */
159 unsigned long entry_crc32;
160 unsigned long (*crc32func)(unsigned long, const void *,
161 size_t);
162 char ignore_crc32;
163
164 /* Flags to mark progress of decompression. */
165 char decompress_init;
166 char end_of_entry;
167
168 #ifdef HAVE_ZLIB_H
169 unsigned char *uncompressed_buffer;
170 size_t uncompressed_buffer_size;
171 z_stream stream;
172 char stream_valid;
173 #endif
174
175 struct archive_string_conv *sconv;
176 struct archive_string_conv *sconv_default;
177 struct archive_string_conv *sconv_utf8;
178 int init_default_conversion;
179 int process_mac_extensions;
180
181 char init_decryption;
182
183 /* Decryption buffer. */
184 unsigned char *decrypted_buffer;
185 unsigned char *decrypted_ptr;
186 size_t decrypted_buffer_size;
187 size_t decrypted_bytes_remaining;
188 size_t decrypted_unconsumed_bytes;
189
190 /* Traditional PKWARE decryption. */
191 struct trad_enc_ctx tctx;
192 char tctx_valid;
193
194 /* WinZip AES decyption. */
195 /* Contexts used for AES decryption. */
196 archive_crypto_ctx cctx;
197 char cctx_valid;
198 archive_hmac_sha1_ctx hctx;
199 char hctx_valid;
200
201 /* Strong encryption's decryption header information. */
202 unsigned iv_size;
203 unsigned alg_id;
204 unsigned bit_len;
205 unsigned flags;
206 unsigned erd_size;
207 unsigned v_size;
208 unsigned v_crc32;
209 uint8_t *iv;
210 uint8_t *erd;
211 uint8_t *v_data;
212 };
213
214 /* Many systems define min or MIN, but not all. */
215 #define zipmin(a,b) ((a) < (b) ? (a) : (b))
216
217 /* ------------------------------------------------------------------------ */
218
219 /*
220 Traditional PKWARE Decryption functions.
221 */
222
223 static void
224 trad_enc_update_keys(struct trad_enc_ctx *ctx, uint8_t c)
225 {
226 uint8_t t;
227 #define CRC32(c, b) (crc32(c ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL)
228
229 ctx->keys[0] = CRC32(ctx->keys[0], c);
230 ctx->keys[1] = (ctx->keys[1] + (ctx->keys[0] & 0xff)) * 134775813L + 1;
231 t = (ctx->keys[1] >> 24) & 0xff;
232 ctx->keys[2] = CRC32(ctx->keys[2], t);
233 #undef CRC32
234 }
235
236 static uint8_t
237 trad_enc_decypt_byte(struct trad_enc_ctx *ctx)
238 {
239 unsigned temp = ctx->keys[2] | 2;
240 return (uint8_t)((temp * (temp ^ 1)) >> 8) & 0xff;
241 }
242
243 static void
244 trad_enc_decrypt_update(struct trad_enc_ctx *ctx, const uint8_t *in,
245 size_t in_len, uint8_t *out, size_t out_len)
246 {
247 unsigned i, max;
248
249 max = (unsigned)((in_len < out_len)? in_len: out_len);
250
251 for (i = 0; i < max; i++) {
252 uint8_t t = in[i] ^ trad_enc_decypt_byte(ctx);
253 out[i] = t;
254 trad_enc_update_keys(ctx, t);
255 }
256 }
257
258 static int
259 trad_enc_init(struct trad_enc_ctx *ctx, const char *pw, size_t pw_len,
260 const uint8_t *key, size_t key_len, uint8_t *crcchk)
261 {
262 uint8_t header[12];
263
264 if (key_len < 12) {
265 *crcchk = 0xff;
266 return -1;
267 }
268
269 ctx->keys[0] = 305419896L;
270 ctx->keys[1] = 591751049L;
271 ctx->keys[2] = 878082192L;
272
273 for (;pw_len; --pw_len)
274 trad_enc_update_keys(ctx, *pw++);
275
276 trad_enc_decrypt_update(ctx, key, 12, header, 12);
277 /* Return the last byte for CRC check. */
278 *crcchk = header[11];
279 return 0;
280 }
281
282 #if 0
283 static void
284 crypt_derive_key_sha1(const void *p, int size, unsigned char *key,
285 int key_size)
286 {
287 #define MD_SIZE 20
288 archive_sha1_ctx ctx;
289 unsigned char md1[MD_SIZE];
290 unsigned char md2[MD_SIZE * 2];
291 unsigned char mkb[64];
292 int i;
293
294 archive_sha1_init(&ctx);
295 archive_sha1_update(&ctx, p, size);
296 archive_sha1_final(&ctx, md1);
297
298 memset(mkb, 0x36, sizeof(mkb));
299 for (i = 0; i < MD_SIZE; i++)
300 mkb[i] ^= md1[i];
301 archive_sha1_init(&ctx);
302 archive_sha1_update(&ctx, mkb, sizeof(mkb));
303 archive_sha1_final(&ctx, md2);
304
305 memset(mkb, 0x5C, sizeof(mkb));
306 for (i = 0; i < MD_SIZE; i++)
307 mkb[i] ^= md1[i];
308 archive_sha1_init(&ctx);
309 archive_sha1_update(&ctx, mkb, sizeof(mkb));
310 archive_sha1_final(&ctx, md2 + MD_SIZE);
311
312 if (key_size > 32)
313 key_size = 32;
314 memcpy(key, md2, key_size);
315 #undef MD_SIZE
316 }
317 #endif
318
319 /*
320 * Common code for streaming or seeking modes.
321 *
322 * Includes code to read local file headers, decompress data
323 * from entry bodies, and common API.
324 */
325
326 static unsigned long
327 real_crc32(unsigned long crc, const void *buff, size_t len)
328 {
329 return crc32(crc, buff, (unsigned int)len);
330 }
331
332 /* Used by "ignorecrc32" option to speed up tests. */
333 static unsigned long
334 fake_crc32(unsigned long crc, const void *buff, size_t len)
335 {
336 (void)crc; /* UNUSED */
337 (void)buff; /* UNUSED */
338 (void)len; /* UNUSED */
339 return 0;
340 }
341
342 static struct {
343 int id;
344 const char * name;
345 } compression_methods[] = {
346 {0, "uncompressed"}, /* The file is stored (no compression) */
347 {1, "shrinking"}, /* The file is Shrunk */
348 {2, "reduced-1"}, /* The file is Reduced with compression factor 1 */
349 {3, "reduced-2"}, /* The file is Reduced with compression factor 2 */
350 {4, "reduced-3"}, /* The file is Reduced with compression factor 3 */
351 {5, "reduced-4"}, /* The file is Reduced with compression factor 4 */
352 {6, "imploded"}, /* The file is Imploded */
353 {7, "reserved"}, /* Reserved for Tokenizing compression algorithm */
354 {8, "deflation"}, /* The file is Deflated */
355 {9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */
356 {10, "ibm-terse"},/* PKWARE Data Compression Library Imploding
357 * (old IBM TERSE) */
358 {11, "reserved"}, /* Reserved by PKWARE */
359 {12, "bzip"}, /* File is compressed using BZIP2 algorithm */
360 {13, "reserved"}, /* Reserved by PKWARE */
361 {14, "lzma"}, /* LZMA (EFS) */
362 {15, "reserved"}, /* Reserved by PKWARE */
363 {16, "reserved"}, /* Reserved by PKWARE */
364 {17, "reserved"}, /* Reserved by PKWARE */
365 {18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */
366 {19, "ibm-lz777"},/* IBM LZ77 z Architecture (PFS) */
367 {97, "wav-pack"}, /* WavPack compressed data */
368 {98, "ppmd-1"}, /* PPMd version I, Rev 1 */
369 {99, "aes"} /* WinZip AES encryption */
370 };
371
372 static const char *
373 compression_name(const int compression)
374 {
375 static const int num_compression_methods =
376 sizeof(compression_methods)/sizeof(compression_methods[0]);
377 int i=0;
378
379 while(compression >= 0 && i < num_compression_methods) {
380 if (compression_methods[i].id == compression)
381 return compression_methods[i].name;
382 i++;
383 }
384 return "??";
385 }
386
387 /* Convert an MSDOS-style date/time into Unix-style time. */
388 static time_t
389 zip_time(const char *p)
390 {
391 int msTime, msDate;
392 struct tm ts;
393
394 msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]);
395 msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]);
396
397 memset(&ts, 0, sizeof(ts));
398 ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */
399 ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */
400 ts.tm_mday = msDate & 0x1f; /* Day of month. */
401 ts.tm_hour = (msTime >> 11) & 0x1f;
402 ts.tm_min = (msTime >> 5) & 0x3f;
403 ts.tm_sec = (msTime << 1) & 0x3e;
404 ts.tm_isdst = -1;
405 return mktime(&ts);
406 }
407
408 /*
409 * The extra data is stored as a list of
410 * id1+size1+data1 + id2+size2+data2 ...
411 * triplets. id and size are 2 bytes each.
412 */
413 static void
414 process_extra(const char *p, size_t extra_length, struct zip_entry* zip_entry)
415 {
416 unsigned offset = 0;
417
418 while (offset < extra_length - 4) {
419 unsigned short headerid = archive_le16dec(p + offset);
420 unsigned short datasize = archive_le16dec(p + offset + 2);
421
422 offset += 4;
423 if (offset + datasize > extra_length) {
424 break;
425 }
426 #ifdef DEBUG
427 fprintf(stderr, "Header id 0x%04x, length %d\n",
428 headerid, datasize);
429 #endif
430 switch (headerid) {
431 case 0x0001:
432 /* Zip64 extended information extra field. */
433 zip_entry->flags |= LA_USED_ZIP64;
434 if (zip_entry->uncompressed_size == 0xffffffff) {
435 if (datasize < 8)
436 break;
437 zip_entry->uncompressed_size =
438 archive_le64dec(p + offset);
439 offset += 8;
440 datasize -= 8;
441 }
442 if (zip_entry->compressed_size == 0xffffffff) {
443 if (datasize < 8)
444 break;
445 zip_entry->compressed_size =
446 archive_le64dec(p + offset);
447 offset += 8;
448 datasize -= 8;
449 }
450 if (zip_entry->local_header_offset == 0xffffffff) {
451 if (datasize < 8)
452 break;
453 zip_entry->local_header_offset =
454 archive_le64dec(p + offset);
455 offset += 8;
456 datasize -= 8;
457 }
458 /* archive_le32dec(p + offset) gives disk
459 * on which file starts, but we don't handle
460 * multi-volume Zip files. */
461 break;
462 #ifdef DEBUG
463 case 0x0017:
464 {
465 /* Strong encryption field. */
466 if (archive_le16dec(p + offset) == 2) {
467 unsigned algId =
468 archive_le16dec(p + offset + 2);
469 unsigned bitLen =
470 archive_le16dec(p + offset + 4);
471 int flags =
472 archive_le16dec(p + offset + 6);
473 fprintf(stderr, "algId=0x%04x, bitLen=%u, "
474 "flgas=%d\n", algId, bitLen,flags);
475 }
476 break;
477 }
478 #endif
479 case 0x5455:
480 {
481 /* Extended time field "UT". */
482 int flags = p[offset];
483 offset++;
484 datasize--;
485 /* Flag bits indicate which dates are present. */
486 if (flags & 0x01)
487 {
488 #ifdef DEBUG
489 fprintf(stderr, "mtime: %lld -> %d\n",
490 (long long)zip_entry->mtime,
491 archive_le32dec(p + offset));
492 #endif
493 if (datasize < 4)
494 break;
495 zip_entry->mtime = archive_le32dec(p + offset);
496 offset += 4;
497 datasize -= 4;
498 }
499 if (flags & 0x02)
500 {
501 if (datasize < 4)
502 break;
503 zip_entry->atime = archive_le32dec(p + offset);
504 offset += 4;
505 datasize -= 4;
506 }
507 if (flags & 0x04)
508 {
509 if (datasize < 4)
510 break;
511 zip_entry->ctime = archive_le32dec(p + offset);
512 offset += 4;
513 datasize -= 4;
514 }
515 break;
516 }
517 case 0x5855:
518 {
519 /* Info-ZIP Unix Extra Field (old version) "UX". */
520 if (datasize >= 8) {
521 zip_entry->atime = archive_le32dec(p + offset);
522 zip_entry->mtime =
523 archive_le32dec(p + offset + 4);
524 }
525 if (datasize >= 12) {
526 zip_entry->uid =
527 archive_le16dec(p + offset + 8);
528 zip_entry->gid =
529 archive_le16dec(p + offset + 10);
530 }
531 break;
532 }
533 case 0x6c78:
534 {
535 /* Experimental 'xl' field */
536 /*
537 * Introduced Dec 2013 to provide a way to
538 * include external file attributes (and other
539 * fields that ordinarily appear only in
540 * central directory) in local file header.
541 * This provides file type and permission
542 * information necessary to support full
543 * streaming extraction. Currently being
544 * discussed with other Zip developers
545 * ... subject to change.
546 *
547 * Format:
548 * The field starts with a bitmap that specifies
549 * which additional fields are included. The
550 * bitmap is variable length and can be extended in
551 * the future.
552 *
553 * n bytes - feature bitmap: first byte has low-order
554 * 7 bits. If high-order bit is set, a subsequent
555 * byte holds the next 7 bits, etc.
556 *
557 * if bitmap & 1, 2 byte "version made by"
558 * if bitmap & 2, 2 byte "internal file attributes"
559 * if bitmap & 4, 4 byte "external file attributes"
560 * if bitmap & 8, 2 byte comment length + n byte comment
561 */
562 int bitmap, bitmap_last;
563
564 if (datasize < 1)
565 break;
566 bitmap_last = bitmap = 0xff & p[offset];
567 offset += 1;
568 datasize -= 1;
569
570 /* We only support first 7 bits of bitmap; skip rest. */
571 while ((bitmap_last & 0x80) != 0
572 && datasize >= 1) {
573 bitmap_last = p[offset];
574 offset += 1;
575 datasize -= 1;
576 }
577
578 if (bitmap & 1) {
579 /* 2 byte "version made by" */
580 if (datasize < 2)
581 break;
582 zip_entry->system
583 = archive_le16dec(p + offset) >> 8;
584 offset += 2;
585 datasize -= 2;
586 }
587 if (bitmap & 2) {
588 /* 2 byte "internal file attributes" */
589 uint32_t internal_attributes;
590 if (datasize < 2)
591 break;
592 internal_attributes
593 = archive_le16dec(p + offset);
594 /* Not used by libarchive at present. */
595 (void)internal_attributes; /* UNUSED */
596 offset += 2;
597 datasize -= 2;
598 }
599 if (bitmap & 4) {
600 /* 4 byte "external file attributes" */
601 uint32_t external_attributes;
602 if (datasize < 4)
603 break;
604 external_attributes
605 = archive_le32dec(p + offset);
606 if (zip_entry->system == 3) {
607 zip_entry->mode
608 = external_attributes >> 16;
609 } else if (zip_entry->system == 0) {
610 // Interpret MSDOS directory bit
611 if (0x10 == (external_attributes & 0x10)) {
612 zip_entry->mode = AE_IFDIR | 0775;
613 } else {
614 zip_entry->mode = AE_IFREG | 0664;
615 }
616 if (0x01 == (external_attributes & 0x01)) {
617 // Read-only bit; strip write permissions
618 zip_entry->mode &= 0555;
619 }
620 } else {
621 zip_entry->mode = 0;
622 }
623 offset += 4;
624 datasize -= 4;
625 }
626 if (bitmap & 8) {
627 /* 2 byte comment length + comment */
628 uint32_t comment_length;
629 if (datasize < 2)
630 break;
631 comment_length
632 = archive_le16dec(p + offset);
633 offset += 2;
634 datasize -= 2;
635
636 if (datasize < comment_length)
637 break;
638 /* Comment is not supported by libarchive */
639 offset += comment_length;
640 datasize -= comment_length;
641 }
642 break;
643 }
644 case 0x7855:
645 /* Info-ZIP Unix Extra Field (type 2) "Ux". */
646 #ifdef DEBUG
647 fprintf(stderr, "uid %d gid %d\n",
648 archive_le16dec(p + offset),
649 archive_le16dec(p + offset + 2));
650 #endif
651 if (datasize >= 2)
652 zip_entry->uid = archive_le16dec(p + offset);
653 if (datasize >= 4)
654 zip_entry->gid =
655 archive_le16dec(p + offset + 2);
656 break;
657 case 0x7875:
658 {
659 /* Info-Zip Unix Extra Field (type 3) "ux". */
660 int uidsize = 0, gidsize = 0;
661
662 /* TODO: support arbitrary uidsize/gidsize. */
663 if (datasize >= 1 && p[offset] == 1) {/* version=1 */
664 if (datasize >= 4) {
665 /* get a uid size. */
666 uidsize = 0xff & (int)p[offset+1];
667 if (uidsize == 2)
668 zip_entry->uid =
669 archive_le16dec(
670 p + offset + 2);
671 else if (uidsize == 4 && datasize >= 6)
672 zip_entry->uid =
673 archive_le32dec(
674 p + offset + 2);
675 }
676 if (datasize >= (2 + uidsize + 3)) {
677 /* get a gid size. */
678 gidsize = 0xff & (int)p[offset+2+uidsize];
679 if (gidsize == 2)
680 zip_entry->gid =
681 archive_le16dec(
682 p+offset+2+uidsize+1);
683 else if (gidsize == 4 &&
684 datasize >= (2 + uidsize + 5))
685 zip_entry->gid =
686 archive_le32dec(
687 p+offset+2+uidsize+1);
688 }
689 }
690 break;
691 }
692 case 0x9901:
693 /* WinZIp AES extra data field. */
694 if (p[offset + 2] == 'A' && p[offset + 3] == 'E') {
695 /* Vendor version. */
696 zip_entry->aes_extra.vendor =
697 archive_le16dec(p + offset);
698 /* AES encryption strength. */
699 zip_entry->aes_extra.strength = p[offset + 4];
700 /* Actual compression method. */
701 zip_entry->aes_extra.compression =
702 p[offset + 5];
703 }
704 break;
705 default:
706 break;
707 }
708 offset += datasize;
709 }
710 #ifdef DEBUG
711 if (offset != extra_length)
712 {
713 fprintf(stderr,
714 "Extra data field contents do not match reported size!\n");
715 }
716 #endif
717 }
718
719 /*
720 * Assumes file pointer is at beginning of local file header.
721 */
722 static int
723 zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry,
724 struct zip *zip)
725 {
726 const char *p;
727 const void *h;
728 const wchar_t *wp;
729 const char *cp;
730 size_t len, filename_length, extra_length;
731 struct archive_string_conv *sconv;
732 struct zip_entry *zip_entry = zip->entry;
733 struct zip_entry zip_entry_central_dir;
734 int ret = ARCHIVE_OK;
735 char version;
736
737 /* Save a copy of the original for consistency checks. */
738 zip_entry_central_dir = *zip_entry;
739
740 zip->decompress_init = 0;
741 zip->end_of_entry = 0;
742 zip->entry_uncompressed_bytes_read = 0;
743 zip->entry_compressed_bytes_read = 0;
744 zip->entry_crc32 = zip->crc32func(0, NULL, 0);
745
746 /* Setup default conversion. */
747 if (zip->sconv == NULL && !zip->init_default_conversion) {
748 zip->sconv_default =
749 archive_string_default_conversion_for_read(&(a->archive));
750 zip->init_default_conversion = 1;
751 }
752
753 if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) {
754 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
755 "Truncated ZIP file header");
756 return (ARCHIVE_FATAL);
757 }
758
759 if (memcmp(p, "PK\003\004", 4) != 0) {
760 archive_set_error(&a->archive, -1, "Damaged Zip archive");
761 return ARCHIVE_FATAL;
762 }
763 version = p[4];
764 zip_entry->system = p[5];
765 zip_entry->zip_flags = archive_le16dec(p + 6);
766 if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) {
767 zip->has_encrypted_entries = 1;
768 archive_entry_set_is_data_encrypted(entry, 1);
769 if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED &&
770 zip_entry->zip_flags & ZIP_ENCRYPTED &&
771 zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) {
772 archive_entry_set_is_metadata_encrypted(entry, 1);
773 return ARCHIVE_FATAL;
774 }
775 }
776 zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED);
777 zip_entry->compression = (char)archive_le16dec(p + 8);
778 zip_entry->mtime = zip_time(p + 10);
779 zip_entry->crc32 = archive_le32dec(p + 14);
780 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
781 zip_entry->decdat = p[11];
782 else
783 zip_entry->decdat = p[17];
784 zip_entry->compressed_size = archive_le32dec(p + 18);
785 zip_entry->uncompressed_size = archive_le32dec(p + 22);
786 filename_length = archive_le16dec(p + 26);
787 extra_length = archive_le16dec(p + 28);
788
789 __archive_read_consume(a, 30);
790
791 /* Read the filename. */
792 if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) {
793 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
794 "Truncated ZIP file header");
795 return (ARCHIVE_FATAL);
796 }
797 if (zip_entry->zip_flags & ZIP_UTF8_NAME) {
798 /* The filename is stored to be UTF-8. */
799 if (zip->sconv_utf8 == NULL) {
800 zip->sconv_utf8 =
801 archive_string_conversion_from_charset(
802 &a->archive, "UTF-8", 1);
803 if (zip->sconv_utf8 == NULL)
804 return (ARCHIVE_FATAL);
805 }
806 sconv = zip->sconv_utf8;
807 } else if (zip->sconv != NULL)
808 sconv = zip->sconv;
809 else
810 sconv = zip->sconv_default;
811
812 if (archive_entry_copy_pathname_l(entry,
813 h, filename_length, sconv) != 0) {
814 if (errno == ENOMEM) {
815 archive_set_error(&a->archive, ENOMEM,
816 "Can't allocate memory for Pathname");
817 return (ARCHIVE_FATAL);
818 }
819 archive_set_error(&a->archive,
820 ARCHIVE_ERRNO_FILE_FORMAT,
821 "Pathname cannot be converted "
822 "from %s to current locale.",
823 archive_string_conversion_charset_name(sconv));
824 ret = ARCHIVE_WARN;
825 }
826 __archive_read_consume(a, filename_length);
827
828 /* Read the extra data. */
829 if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) {
830 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
831 "Truncated ZIP file header");
832 return (ARCHIVE_FATAL);
833 }
834
835 process_extra(h, extra_length, zip_entry);
836 __archive_read_consume(a, extra_length);
837
838 /* Work around a bug in Info-Zip: When reading from a pipe, it
839 * stats the pipe instead of synthesizing a file entry. */
840 if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) {
841 zip_entry->mode &= ~ AE_IFMT;
842 zip_entry->mode |= AE_IFREG;
843 }
844
845 if ((zip_entry->mode & AE_IFMT) == 0) {
846 /* Especially in streaming mode, we can end up
847 here without having seen proper mode information.
848 Guess from the filename. */
849 wp = archive_entry_pathname_w(entry);
850 if (wp != NULL) {
851 len = wcslen(wp);
852 if (len > 0 && wp[len - 1] == L'/')
853 zip_entry->mode |= AE_IFDIR;
854 else
855 zip_entry->mode |= AE_IFREG;
856 } else {
857 cp = archive_entry_pathname(entry);
858 len = (cp != NULL)?strlen(cp):0;
859 if (len > 0 && cp[len - 1] == '/')
860 zip_entry->mode |= AE_IFDIR;
861 else
862 zip_entry->mode |= AE_IFREG;
863 }
864 if (zip_entry->mode == AE_IFDIR) {
865 zip_entry->mode |= 0775;
866 } else if (zip_entry->mode == AE_IFREG) {
867 zip_entry->mode |= 0664;
868 }
869 }
870
871 /* Make sure directories end in '/' */
872 if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) {
873 wp = archive_entry_pathname_w(entry);
874 if (wp != NULL) {
875 len = wcslen(wp);
876 if (len > 0 && wp[len - 1] != L'/') {
877 struct archive_wstring s;
878 archive_string_init(&s);
879 archive_wstrcat(&s, wp);
880 archive_wstrappend_wchar(&s, L'/');
881 archive_entry_copy_pathname_w(entry, s.s);
882 }
883 } else {
884 cp = archive_entry_pathname(entry);
885 len = (cp != NULL)?strlen(cp):0;
886 if (len > 0 && cp[len - 1] != '/') {
887 struct archive_string s;
888 archive_string_init(&s);
889 archive_strcat(&s, cp);
890 archive_strappend_char(&s, '/');
891 archive_entry_set_pathname(entry, s.s);
892 }
893 }
894 }
895
896 if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) {
897 /* If this came from the central dir, it's size info
898 * is definitive, so ignore the length-at-end flag. */
899 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END;
900 /* If local header is missing a value, use the one from
901 the central directory. If both have it, warn about
902 mismatches. */
903 if (zip_entry->crc32 == 0) {
904 zip_entry->crc32 = zip_entry_central_dir.crc32;
905 } else if (!zip->ignore_crc32
906 && zip_entry->crc32 != zip_entry_central_dir.crc32) {
907 archive_set_error(&a->archive,
908 ARCHIVE_ERRNO_FILE_FORMAT,
909 "Inconsistent CRC32 values");
910 ret = ARCHIVE_WARN;
911 }
912 if (zip_entry->compressed_size == 0) {
913 zip_entry->compressed_size
914 = zip_entry_central_dir.compressed_size;
915 } else if (zip_entry->compressed_size
916 != zip_entry_central_dir.compressed_size) {
917 archive_set_error(&a->archive,
918 ARCHIVE_ERRNO_FILE_FORMAT,
919 "Inconsistent compressed size: "
920 "%jd in central directory, %jd in local header",
921 (intmax_t)zip_entry_central_dir.compressed_size,
922 (intmax_t)zip_entry->compressed_size);
923 ret = ARCHIVE_WARN;
924 }
925 if (zip_entry->uncompressed_size == 0) {
926 zip_entry->uncompressed_size
927 = zip_entry_central_dir.uncompressed_size;
928 } else if (zip_entry->uncompressed_size
929 != zip_entry_central_dir.uncompressed_size) {
930 archive_set_error(&a->archive,
931 ARCHIVE_ERRNO_FILE_FORMAT,
932 "Inconsistent uncompressed size: "
933 "%jd in central directory, %jd in local header",
934 (intmax_t)zip_entry_central_dir.uncompressed_size,
935 (intmax_t)zip_entry->uncompressed_size);
936 ret = ARCHIVE_WARN;
937 }
938 }
939
940 /* Populate some additional entry fields: */
941 archive_entry_set_mode(entry, zip_entry->mode);
942 archive_entry_set_uid(entry, zip_entry->uid);
943 archive_entry_set_gid(entry, zip_entry->gid);
944 archive_entry_set_mtime(entry, zip_entry->mtime, 0);
945 archive_entry_set_ctime(entry, zip_entry->ctime, 0);
946 archive_entry_set_atime(entry, zip_entry->atime, 0);
947
948 if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) {
949 size_t linkname_length;
950
951 if (zip_entry->compressed_size > 64 * 1024) {
952 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
953 "Zip file with oversized link entry");
954 return ARCHIVE_FATAL;
955 }
956
957 linkname_length = (size_t)zip_entry->compressed_size;
958
959 archive_entry_set_size(entry, 0);
960 p = __archive_read_ahead(a, linkname_length, NULL);
961 if (p == NULL) {
962 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
963 "Truncated Zip file");
964 return ARCHIVE_FATAL;
965 }
966
967 sconv = zip->sconv;
968 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME))
969 sconv = zip->sconv_utf8;
970 if (sconv == NULL)
971 sconv = zip->sconv_default;
972 if (archive_entry_copy_symlink_l(entry, p, linkname_length,
973 sconv) != 0) {
974 if (errno != ENOMEM && sconv == zip->sconv_utf8 &&
975 (zip->entry->zip_flags & ZIP_UTF8_NAME))
976 archive_entry_copy_symlink_l(entry, p,
977 linkname_length, NULL);
978 if (errno == ENOMEM) {
979 archive_set_error(&a->archive, ENOMEM,
980 "Can't allocate memory for Symlink");
981 return (ARCHIVE_FATAL);
982 }
983 /*
984 * Since there is no character-set regulation for
985 * symlink name, do not report the conversion error
986 * in an automatic conversion.
987 */
988 if (sconv != zip->sconv_utf8 ||
989 (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) {
990 archive_set_error(&a->archive,
991 ARCHIVE_ERRNO_FILE_FORMAT,
992 "Symlink cannot be converted "
993 "from %s to current locale.",
994 archive_string_conversion_charset_name(
995 sconv));
996 ret = ARCHIVE_WARN;
997 }
998 }
999 zip_entry->uncompressed_size = zip_entry->compressed_size = 0;
1000
1001 if (__archive_read_consume(a, linkname_length) < 0) {
1002 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1003 "Read error skipping symlink target name");
1004 return ARCHIVE_FATAL;
1005 }
1006 } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1007 || zip_entry->uncompressed_size > 0) {
1008 /* Set the size only if it's meaningful. */
1009 archive_entry_set_size(entry, zip_entry->uncompressed_size);
1010 }
1011 zip->entry_bytes_remaining = zip_entry->compressed_size;
1012
1013 /* If there's no body, force read_data() to return EOF immediately. */
1014 if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1015 && zip->entry_bytes_remaining < 1)
1016 zip->end_of_entry = 1;
1017
1018 /* Set up a more descriptive format name. */
1019 archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)",
1020 version / 10, version % 10,
1021 compression_name(zip->entry->compression));
1022 a->archive.archive_format_name = zip->format_name.s;
1023
1024 return (ret);
1025 }
1026
1027 static int
1028 check_authentication_code(struct archive_read *a, const void *_p)
1029 {
1030 struct zip *zip = (struct zip *)(a->format->data);
1031
1032 /* Check authentication code. */
1033 if (zip->hctx_valid) {
1034 const void *p;
1035 uint8_t hmac[20];
1036 size_t hmac_len = 20;
1037 int cmp;
1038
1039 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len);
1040 if (_p == NULL) {
1041 /* Read authentication code. */
1042 p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL);
1043 if (p == NULL) {
1044 archive_set_error(&a->archive,
1045 ARCHIVE_ERRNO_FILE_FORMAT,
1046 "Truncated ZIP file data");
1047 return (ARCHIVE_FATAL);
1048 }
1049 } else {
1050 p = _p;
1051 }
1052 cmp = memcmp(hmac, p, AUTH_CODE_SIZE);
1053 __archive_read_consume(a, AUTH_CODE_SIZE);
1054 if (cmp != 0) {
1055 archive_set_error(&a->archive,
1056 ARCHIVE_ERRNO_MISC,
1057 "ZIP bad Authentication code");
1058 return (ARCHIVE_WARN);
1059 }
1060 }
1061 return (ARCHIVE_OK);
1062 }
1063
1064 /*
1065 * Read "uncompressed" data. There are three cases:
1066 * 1) We know the size of the data. This is always true for the
1067 * seeking reader (we've examined the Central Directory already).
1068 * 2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred.
1069 * Info-ZIP seems to do this; we know the size but have to grab
1070 * the CRC from the data descriptor afterwards.
1071 * 3) We're streaming and ZIP_LENGTH_AT_END was specified and
1072 * we have no size information. In this case, we can do pretty
1073 * well by watching for the data descriptor record. The data
1074 * descriptor is 16 bytes and includes a computed CRC that should
1075 * provide a strong check.
1076 *
1077 * TODO: Technically, the PK\007\010 signature is optional.
1078 * In the original spec, the data descriptor contained CRC
1079 * and size fields but had no leading signature. In practice,
1080 * newer writers seem to provide the signature pretty consistently.
1081 *
1082 * For uncompressed data, the PK\007\010 marker seems essential
1083 * to be sure we've actually seen the end of the entry.
1084 *
1085 * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets
1086 * zip->end_of_entry if it consumes all of the data.
1087 */
1088 static int
1089 zip_read_data_none(struct archive_read *a, const void **_buff,
1090 size_t *size, int64_t *offset)
1091 {
1092 struct zip *zip;
1093 const char *buff;
1094 ssize_t bytes_avail;
1095 int r;
1096
1097 (void)offset; /* UNUSED */
1098
1099 zip = (struct zip *)(a->format->data);
1100
1101 if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) {
1102 const char *p;
1103 ssize_t grabbing_bytes = 24;
1104
1105 if (zip->hctx_valid)
1106 grabbing_bytes += AUTH_CODE_SIZE;
1107 /* Grab at least 24 bytes. */
1108 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail);
1109 if (bytes_avail < grabbing_bytes) {
1110 /* Zip archives have end-of-archive markers
1111 that are longer than this, so a failure to get at
1112 least 24 bytes really does indicate a truncated
1113 file. */
1114 archive_set_error(&a->archive,
1115 ARCHIVE_ERRNO_FILE_FORMAT,
1116 "Truncated ZIP file data");
1117 return (ARCHIVE_FATAL);
1118 }
1119 /* Check for a complete PK\007\010 signature, followed
1120 * by the correct 4-byte CRC. */
1121 p = buff;
1122 if (zip->hctx_valid)
1123 p += AUTH_CODE_SIZE;
1124 if (p[0] == 'P' && p[1] == 'K'
1125 && p[2] == '\007' && p[3] == '\010'
1126 && (archive_le32dec(p + 4) == zip->entry_crc32
1127 || zip->ignore_crc32
1128 || (zip->hctx_valid
1129 && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) {
1130 if (zip->entry->flags & LA_USED_ZIP64) {
1131 zip->entry->crc32 = archive_le32dec(p + 4);
1132 zip->entry->compressed_size =
1133 archive_le64dec(p + 8);
1134 zip->entry->uncompressed_size =
1135 archive_le64dec(p + 16);
1136 zip->unconsumed = 24;
1137 } else {
1138 zip->entry->crc32 = archive_le32dec(p + 4);
1139 zip->entry->compressed_size =
1140 archive_le32dec(p + 8);
1141 zip->entry->uncompressed_size =
1142 archive_le32dec(p + 12);
1143 zip->unconsumed = 16;
1144 }
1145 if (zip->hctx_valid) {
1146 r = check_authentication_code(a, buff);
1147 if (r != ARCHIVE_OK)
1148 return (r);
1149 }
1150 zip->end_of_entry = 1;
1151 return (ARCHIVE_OK);
1152 }
1153 /* If not at EOF, ensure we consume at least one byte. */
1154 ++p;
1155
1156 /* Scan forward until we see where a PK\007\010 signature
1157 * might be. */
1158 /* Return bytes up until that point. On the next call,
1159 * the code above will verify the data descriptor. */
1160 while (p < buff + bytes_avail - 4) {
1161 if (p[3] == 'P') { p += 3; }
1162 else if (p[3] == 'K') { p += 2; }
1163 else if (p[3] == '\007') { p += 1; }
1164 else if (p[3] == '\010' && p[2] == '\007'
1165 && p[1] == 'K' && p[0] == 'P') {
1166 if (zip->hctx_valid)
1167 p -= AUTH_CODE_SIZE;
1168 break;
1169 } else { p += 4; }
1170 }
1171 bytes_avail = p - buff;
1172 } else {
1173 if (zip->entry_bytes_remaining == 0) {
1174 zip->end_of_entry = 1;
1175 if (zip->hctx_valid) {
1176 r = check_authentication_code(a, NULL);
1177 if (r != ARCHIVE_OK)
1178 return (r);
1179 }
1180 return (ARCHIVE_OK);
1181 }
1182 /* Grab a bunch of bytes. */
1183 buff = __archive_read_ahead(a, 1, &bytes_avail);
1184 if (bytes_avail <= 0) {
1185 archive_set_error(&a->archive,
1186 ARCHIVE_ERRNO_FILE_FORMAT,
1187 "Truncated ZIP file data");
1188 return (ARCHIVE_FATAL);
1189 }
1190 if (bytes_avail > zip->entry_bytes_remaining)
1191 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1192 }
1193 if (zip->tctx_valid || zip->cctx_valid) {
1194 size_t dec_size = bytes_avail;
1195
1196 if (dec_size > zip->decrypted_buffer_size)
1197 dec_size = zip->decrypted_buffer_size;
1198 if (zip->tctx_valid) {
1199 trad_enc_decrypt_update(&zip->tctx,
1200 (const uint8_t *)buff, dec_size,
1201 zip->decrypted_buffer, dec_size);
1202 } else {
1203 size_t dsize = dec_size;
1204 archive_hmac_sha1_update(&zip->hctx,
1205 (const uint8_t *)buff, dec_size);
1206 archive_decrypto_aes_ctr_update(&zip->cctx,
1207 (const uint8_t *)buff, dec_size,
1208 zip->decrypted_buffer, &dsize);
1209 }
1210 bytes_avail = dec_size;
1211 buff = (const char *)zip->decrypted_buffer;
1212 }
1213 *size = bytes_avail;
1214 zip->entry_bytes_remaining -= bytes_avail;
1215 zip->entry_uncompressed_bytes_read += bytes_avail;
1216 zip->entry_compressed_bytes_read += bytes_avail;
1217 zip->unconsumed += bytes_avail;
1218 *_buff = buff;
1219 return (ARCHIVE_OK);
1220 }
1221
1222 #ifdef HAVE_ZLIB_H
1223 static int
1224 zip_deflate_init(struct archive_read *a, struct zip *zip)
1225 {
1226 int r;
1227
1228 /* If we haven't yet read any data, initialize the decompressor. */
1229 if (!zip->decompress_init) {
1230 if (zip->stream_valid)
1231 r = inflateReset(&zip->stream);
1232 else
1233 r = inflateInit2(&zip->stream,
1234 -15 /* Don't check for zlib header */);
1235 if (r != Z_OK) {
1236 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1237 "Can't initialize ZIP decompression.");
1238 return (ARCHIVE_FATAL);
1239 }
1240 /* Stream structure has been set up. */
1241 zip->stream_valid = 1;
1242 /* We've initialized decompression for this stream. */
1243 zip->decompress_init = 1;
1244 }
1245 return (ARCHIVE_OK);
1246 }
1247
1248 static int
1249 zip_read_data_deflate(struct archive_read *a, const void **buff,
1250 size_t *size, int64_t *offset)
1251 {
1252 struct zip *zip;
1253 ssize_t bytes_avail;
1254 const void *compressed_buff, *sp;
1255 int r;
1256
1257 (void)offset; /* UNUSED */
1258
1259 zip = (struct zip *)(a->format->data);
1260
1261 /* If the buffer hasn't been allocated, allocate it now. */
1262 if (zip->uncompressed_buffer == NULL) {
1263 zip->uncompressed_buffer_size = 256 * 1024;
1264 zip->uncompressed_buffer
1265 = (unsigned char *)malloc(zip->uncompressed_buffer_size);
1266 if (zip->uncompressed_buffer == NULL) {
1267 archive_set_error(&a->archive, ENOMEM,
1268 "No memory for ZIP decompression");
1269 return (ARCHIVE_FATAL);
1270 }
1271 }
1272
1273 r = zip_deflate_init(a, zip);
1274 if (r != ARCHIVE_OK)
1275 return (r);
1276
1277 /*
1278 * Note: '1' here is a performance optimization.
1279 * Recall that the decompression layer returns a count of
1280 * available bytes; asking for more than that forces the
1281 * decompressor to combine reads by copying data.
1282 */
1283 compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail);
1284 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1285 && bytes_avail > zip->entry_bytes_remaining) {
1286 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1287 }
1288 if (bytes_avail <= 0) {
1289 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1290 "Truncated ZIP file body");
1291 return (ARCHIVE_FATAL);
1292 }
1293
1294 if (zip->tctx_valid || zip->cctx_valid) {
1295 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) {
1296 size_t buff_remaining = zip->decrypted_buffer_size
1297 - (zip->decrypted_ptr - zip->decrypted_buffer);
1298
1299 if (buff_remaining > (size_t)bytes_avail)
1300 buff_remaining = (size_t)bytes_avail;
1301
1302 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) &&
1303 zip->entry_bytes_remaining > 0) {
1304 if ((int64_t)(zip->decrypted_bytes_remaining
1305 + buff_remaining)
1306 > zip->entry_bytes_remaining) {
1307 if (zip->entry_bytes_remaining <
1308 (int64_t)zip->decrypted_bytes_remaining)
1309 buff_remaining = 0;
1310 else
1311 buff_remaining =
1312 (size_t)zip->entry_bytes_remaining
1313 - zip->decrypted_bytes_remaining;
1314 }
1315 }
1316 if (buff_remaining > 0) {
1317 if (zip->tctx_valid) {
1318 trad_enc_decrypt_update(&zip->tctx,
1319 compressed_buff, buff_remaining,
1320 zip->decrypted_ptr
1321 + zip->decrypted_bytes_remaining,
1322 buff_remaining);
1323 } else {
1324 size_t dsize = buff_remaining;
1325 archive_decrypto_aes_ctr_update(
1326 &zip->cctx,
1327 compressed_buff, buff_remaining,
1328 zip->decrypted_ptr
1329 + zip->decrypted_bytes_remaining,
1330 &dsize);
1331 }
1332 zip->decrypted_bytes_remaining += buff_remaining;
1333 }
1334 }
1335 bytes_avail = zip->decrypted_bytes_remaining;
1336 compressed_buff = (const char *)zip->decrypted_ptr;
1337 }
1338
1339 /*
1340 * A bug in zlib.h: stream.next_in should be marked 'const'
1341 * but isn't (the library never alters data through the
1342 * next_in pointer, only reads it). The result: this ugly
1343 * cast to remove 'const'.
1344 */
1345 zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff;
1346 zip->stream.avail_in = (uInt)bytes_avail;
1347 zip->stream.total_in = 0;
1348 zip->stream.next_out = zip->uncompressed_buffer;
1349 zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size;
1350 zip->stream.total_out = 0;
1351
1352 r = inflate(&zip->stream, 0);
1353 switch (r) {
1354 case Z_OK:
1355 break;
1356 case Z_STREAM_END:
1357 zip->end_of_entry = 1;
1358 break;
1359 case Z_MEM_ERROR:
1360 archive_set_error(&a->archive, ENOMEM,
1361 "Out of memory for ZIP decompression");
1362 return (ARCHIVE_FATAL);
1363 default:
1364 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1365 "ZIP decompression failed (%d)", r);
1366 return (ARCHIVE_FATAL);
1367 }
1368
1369 /* Consume as much as the compressor actually used. */
1370 bytes_avail = zip->stream.total_in;
1371 if (zip->tctx_valid || zip->cctx_valid) {
1372 zip->decrypted_bytes_remaining -= bytes_avail;
1373 if (zip->decrypted_bytes_remaining == 0)
1374 zip->decrypted_ptr = zip->decrypted_buffer;
1375 else
1376 zip->decrypted_ptr += bytes_avail;
1377 }
1378 /* Calculate compressed data as much as we used.*/
1379 if (zip->hctx_valid)
1380 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail);
1381 __archive_read_consume(a, bytes_avail);
1382 zip->entry_bytes_remaining -= bytes_avail;
1383 zip->entry_compressed_bytes_read += bytes_avail;
1384
1385 *size = zip->stream.total_out;
1386 zip->entry_uncompressed_bytes_read += zip->stream.total_out;
1387 *buff = zip->uncompressed_buffer;
1388
1389 if (zip->end_of_entry && zip->hctx_valid) {
1390 r = check_authentication_code(a, NULL);
1391 if (r != ARCHIVE_OK)
1392 return (r);
1393 }
1394
1395 if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1396 const char *p;
1397
1398 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) {
1399 archive_set_error(&a->archive,
1400 ARCHIVE_ERRNO_FILE_FORMAT,
1401 "Truncated ZIP end-of-file record");
1402 return (ARCHIVE_FATAL);
1403 }
1404 /* Consume the optional PK\007\010 marker. */
1405 if (p[0] == 'P' && p[1] == 'K' &&
1406 p[2] == '\007' && p[3] == '\010') {
1407 p += 4;
1408 zip->unconsumed = 4;
1409 }
1410 if (zip->entry->flags & LA_USED_ZIP64) {
1411 zip->entry->crc32 = archive_le32dec(p);
1412 zip->entry->compressed_size = archive_le64dec(p + 4);
1413 zip->entry->uncompressed_size = archive_le64dec(p + 12);
1414 zip->unconsumed += 20;
1415 } else {
1416 zip->entry->crc32 = archive_le32dec(p);
1417 zip->entry->compressed_size = archive_le32dec(p + 4);
1418 zip->entry->uncompressed_size = archive_le32dec(p + 8);
1419 zip->unconsumed += 12;
1420 }
1421 }
1422
1423 return (ARCHIVE_OK);
1424 }
1425 #endif
1426
1427 static int
1428 read_decryption_header(struct archive_read *a)
1429 {
1430 struct zip *zip = (struct zip *)(a->format->data);
1431 const char *p;
1432 unsigned int remaining_size;
1433 unsigned int ts;
1434
1435 /*
1436 * Read an initialization vector data field.
1437 */
1438 p = __archive_read_ahead(a, 2, NULL);
1439 if (p == NULL)
1440 goto truncated;
1441 ts = zip->iv_size;
1442 zip->iv_size = archive_le16dec(p);
1443 __archive_read_consume(a, 2);
1444 if (ts < zip->iv_size) {
1445 free(zip->iv);
1446 zip->iv = NULL;
1447 }
1448 p = __archive_read_ahead(a, zip->iv_size, NULL);
1449 if (p == NULL)
1450 goto truncated;
1451 if (zip->iv == NULL) {
1452 zip->iv = malloc(zip->iv_size);
1453 if (zip->iv == NULL)
1454 goto nomem;
1455 }
1456 memcpy(zip->iv, p, zip->iv_size);
1457 __archive_read_consume(a, zip->iv_size);
1458
1459 /*
1460 * Read a size of remaining decryption header field.
1461 */
1462 p = __archive_read_ahead(a, 14, NULL);
1463 if (p == NULL)
1464 goto truncated;
1465 remaining_size = archive_le32dec(p);
1466 if (remaining_size < 16 || remaining_size > (1 << 18))
1467 goto corrupted;
1468
1469 /* Check if format version is supported. */
1470 if (archive_le16dec(p+4) != 3) {
1471 archive_set_error(&a->archive,
1472 ARCHIVE_ERRNO_FILE_FORMAT,
1473 "Unsupported encryption format version: %u",
1474 archive_le16dec(p+4));
1475 return (ARCHIVE_FAILED);
1476 }
1477
1478 /*
1479 * Read an encryption algorithm field.
1480 */
1481 zip->alg_id = archive_le16dec(p+6);
1482 switch (zip->alg_id) {
1483 case 0x6601:/* DES */
1484 case 0x6602:/* RC2 */
1485 case 0x6603:/* 3DES 168 */
1486 case 0x6609:/* 3DES 112 */
1487 case 0x660E:/* AES 128 */
1488 case 0x660F:/* AES 192 */
1489 case 0x6610:/* AES 256 */
1490 case 0x6702:/* RC2 (version >= 5.2) */
1491 case 0x6720:/* Blowfish */
1492 case 0x6721:/* Twofish */
1493 case 0x6801:/* RC4 */
1494 /* Suuported encryption algorithm. */
1495 break;
1496 default:
1497 archive_set_error(&a->archive,
1498 ARCHIVE_ERRNO_FILE_FORMAT,
1499 "Unknown encryption algorithm: %u", zip->alg_id);
1500 return (ARCHIVE_FAILED);
1501 }
1502
1503 /*
1504 * Read a bit length field.
1505 */
1506 zip->bit_len = archive_le16dec(p+8);
1507
1508 /*
1509 * Read a flags field.
1510 */
1511 zip->flags = archive_le16dec(p+10);
1512 switch (zip->flags & 0xf000) {
1513 case 0x0001: /* Password is required to decrypt. */
1514 case 0x0002: /* Certificates only. */
1515 case 0x0003: /* Password or certificate required to decrypt. */
1516 break;
1517 default:
1518 archive_set_error(&a->archive,
1519 ARCHIVE_ERRNO_FILE_FORMAT,
1520 "Unknown encryption flag: %u", zip->flags);
1521 return (ARCHIVE_FAILED);
1522 }
1523 if ((zip->flags & 0xf000) == 0 ||
1524 (zip->flags & 0xf000) == 0x4000) {
1525 archive_set_error(&a->archive,
1526 ARCHIVE_ERRNO_FILE_FORMAT,
1527 "Unknown encryption flag: %u", zip->flags);
1528 return (ARCHIVE_FAILED);
1529 }
1530
1531 /*
1532 * Read an encrypted random data field.
1533 */
1534 ts = zip->erd_size;
1535 zip->erd_size = archive_le16dec(p+12);
1536 __archive_read_consume(a, 14);
1537 if ((zip->erd_size & 0xf) != 0 ||
1538 (zip->erd_size + 16) > remaining_size ||
1539 (zip->erd_size + 16) < zip->erd_size)
1540 goto corrupted;
1541
1542 if (ts < zip->erd_size) {
1543 free(zip->erd);
1544 zip->erd = NULL;
1545 }
1546 p = __archive_read_ahead(a, zip->erd_size, NULL);
1547 if (p == NULL)
1548 goto truncated;
1549 if (zip->erd == NULL) {
1550 zip->erd = malloc(zip->erd_size);
1551 if (zip->erd == NULL)
1552 goto nomem;
1553 }
1554 memcpy(zip->erd, p, zip->erd_size);
1555 __archive_read_consume(a, zip->erd_size);
1556
1557 /*
1558 * Read a reserved data field.
1559 */
1560 p = __archive_read_ahead(a, 4, NULL);
1561 if (p == NULL)
1562 goto truncated;
1563 /* Reserved data size should be zero. */
1564 if (archive_le32dec(p) != 0)
1565 goto corrupted;
1566 __archive_read_consume(a, 4);
1567
1568 /*
1569 * Read a password validation data field.
1570 */
1571 p = __archive_read_ahead(a, 2, NULL);
1572 if (p == NULL)
1573 goto truncated;
1574 ts = zip->v_size;
1575 zip->v_size = archive_le16dec(p);
1576 __archive_read_consume(a, 2);
1577 if ((zip->v_size & 0x0f) != 0 ||
1578 (zip->erd_size + zip->v_size + 16) > remaining_size ||
1579 (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size))
1580 goto corrupted;
1581 if (ts < zip->v_size) {
1582 free(zip->v_data);
1583 zip->v_data = NULL;
1584 }
1585 p = __archive_read_ahead(a, zip->v_size, NULL);
1586 if (p == NULL)
1587 goto truncated;
1588 if (zip->v_data == NULL) {
1589 zip->v_data = malloc(zip->v_size);
1590 if (zip->v_data == NULL)
1591 goto nomem;
1592 }
1593 memcpy(zip->v_data, p, zip->v_size);
1594 __archive_read_consume(a, zip->v_size);
1595
1596 p = __archive_read_ahead(a, 4, NULL);
1597 if (p == NULL)
1598 goto truncated;
1599 zip->v_crc32 = archive_le32dec(p);
1600 __archive_read_consume(a, 4);
1601
1602 /*return (ARCHIVE_OK);
1603 * This is not fully implemnted yet.*/
1604 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1605 "Encrypted file is unsupported");
1606 return (ARCHIVE_FAILED);
1607 truncated:
1608 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1609 "Truncated ZIP file data");
1610 return (ARCHIVE_FATAL);
1611 corrupted:
1612 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1613 "Corrupted ZIP file data");
1614 return (ARCHIVE_FATAL);
1615 nomem:
1616 archive_set_error(&a->archive, ENOMEM,
1617 "No memory for ZIP decryption");
1618 return (ARCHIVE_FATAL);
1619 }
1620
1621 static int
1622 zip_alloc_decryption_buffer(struct archive_read *a)
1623 {
1624 struct zip *zip = (struct zip *)(a->format->data);
1625 size_t bs = 256 * 1024;
1626
1627 if (zip->decrypted_buffer == NULL) {
1628 zip->decrypted_buffer_size = bs;
1629 zip->decrypted_buffer = malloc(bs);
1630 if (zip->decrypted_buffer == NULL) {
1631 archive_set_error(&a->archive, ENOMEM,
1632 "No memory for ZIP decryption");
1633 return (ARCHIVE_FATAL);
1634 }
1635 }
1636 zip->decrypted_ptr = zip->decrypted_buffer;
1637 return (ARCHIVE_OK);
1638 }
1639
1640 static int
1641 init_traditional_PKWARE_decryption(struct archive_read *a)
1642 {
1643 struct zip *zip = (struct zip *)(a->format->data);
1644 const void *p;
1645 int retry;
1646 int r;
1647
1648 if (zip->tctx_valid)
1649 return (ARCHIVE_OK);
1650
1651 /*
1652 Read the 12 bytes encryption header stored at
1653 the start of the data area.
1654 */
1655 #define ENC_HEADER_SIZE 12
1656 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1657 && zip->entry_bytes_remaining < ENC_HEADER_SIZE) {
1658 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1659 "Truncated Zip encrypted body: only %jd bytes available",
1660 (intmax_t)zip->entry_bytes_remaining);
1661 return (ARCHIVE_FATAL);
1662 }
1663
1664 p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL);
1665 if (p == NULL) {
1666 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1667 "Truncated ZIP file data");
1668 return (ARCHIVE_FATAL);
1669 }
1670
1671 for (retry = 0;; retry++) {
1672 const char *passphrase;
1673 uint8_t crcchk;
1674
1675 passphrase = __archive_read_next_passphrase(a);
1676 if (passphrase == NULL) {
1677 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1678 (retry > 0)?
1679 "Incorrect passphrase":
1680 "Passphrase required for this entry");
1681 return (ARCHIVE_FAILED);
1682 }
1683
1684 /*
1685 * Initialize ctx for Traditional PKWARE Decyption.
1686 */
1687 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase),
1688 p, ENC_HEADER_SIZE, &crcchk);
1689 if (r == 0 && crcchk == zip->entry->decdat)
1690 break;/* The passphrase is OK. */
1691 if (retry > 10000) {
1692 /* Avoid infinity loop. */
1693 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1694 "Too many incorrect passphrases");
1695 return (ARCHIVE_FAILED);
1696 }
1697 }
1698
1699 __archive_read_consume(a, ENC_HEADER_SIZE);
1700 zip->tctx_valid = 1;
1701 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1702 zip->entry_bytes_remaining -= ENC_HEADER_SIZE;
1703 }
1704 /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/
1705 zip->entry_compressed_bytes_read += ENC_HEADER_SIZE;
1706 zip->decrypted_bytes_remaining = 0;
1707
1708 return (zip_alloc_decryption_buffer(a));
1709 #undef ENC_HEADER_SIZE
1710 }
1711
1712 static int
1713 init_WinZip_AES_decryption(struct archive_read *a)
1714 {
1715 struct zip *zip = (struct zip *)(a->format->data);
1716 const void *p;
1717 const uint8_t *pv;
1718 size_t key_len, salt_len;
1719 uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE];
1720 int retry;
1721 int r;
1722
1723 if (zip->cctx_valid || zip->hctx_valid)
1724 return (ARCHIVE_OK);
1725
1726 switch (zip->entry->aes_extra.strength) {
1727 case 1: salt_len = 8; key_len = 16; break;
1728 case 2: salt_len = 12; key_len = 24; break;
1729 case 3: salt_len = 16; key_len = 32; break;
1730 default: goto corrupted;
1731 }
1732 p = __archive_read_ahead(a, salt_len + 2, NULL);
1733 if (p == NULL)
1734 goto truncated;
1735
1736 for (retry = 0;; retry++) {
1737 const char *passphrase;
1738
1739 passphrase = __archive_read_next_passphrase(a);
1740 if (passphrase == NULL) {
1741 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1742 (retry > 0)?
1743 "Incorrect passphrase":
1744 "Passphrase required for this entry");
1745 return (ARCHIVE_FAILED);
1746 }
1747 memset(derived_key, 0, sizeof(derived_key));
1748 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase),
1749 p, salt_len, 1000, derived_key, key_len * 2 + 2);
1750 if (r != 0) {
1751 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1752 "Decryption is unsupported due to lack of "
1753 "crypto library");
1754 return (ARCHIVE_FAILED);
1755 }
1756
1757 /* Check password verification value. */
1758 pv = ((const uint8_t *)p) + salt_len;
1759 if (derived_key[key_len * 2] == pv[0] &&
1760 derived_key[key_len * 2 + 1] == pv[1])
1761 break;/* The passphrase is OK. */
1762 if (retry > 10000) {
1763 /* Avoid infinity loop. */
1764 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1765 "Too many incorrect passphrases");
1766 return (ARCHIVE_FAILED);
1767 }
1768 }
1769
1770 r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len);
1771 if (r != 0) {
1772 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1773 "Decryption is unsupported due to lack of crypto library");
1774 return (ARCHIVE_FAILED);
1775 }
1776 r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len);
1777 if (r != 0) {
1778 archive_decrypto_aes_ctr_release(&zip->cctx);
1779 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1780 "Failed to initialize HMAC-SHA1");
1781 return (ARCHIVE_FAILED);
1782 }
1783 zip->cctx_valid = zip->hctx_valid = 1;
1784 __archive_read_consume(a, salt_len + 2);
1785 zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE;
1786 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
1787 && zip->entry_bytes_remaining < 0)
1788 goto corrupted;
1789 zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE;
1790 zip->decrypted_bytes_remaining = 0;
1791
1792 zip->entry->compression = zip->entry->aes_extra.compression;
1793 return (zip_alloc_decryption_buffer(a));
1794
1795 truncated:
1796 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1797 "Truncated ZIP file data");
1798 return (ARCHIVE_FATAL);
1799 corrupted:
1800 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1801 "Corrupted ZIP file data");
1802 return (ARCHIVE_FATAL);
1803 }
1804
1805 static int
1806 archive_read_format_zip_read_data(struct archive_read *a,
1807 const void **buff, size_t *size, int64_t *offset)
1808 {
1809 int r;
1810 struct zip *zip = (struct zip *)(a->format->data);
1811
1812 if (zip->has_encrypted_entries ==
1813 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
1814 zip->has_encrypted_entries = 0;
1815 }
1816
1817 *offset = zip->entry_uncompressed_bytes_read;
1818 *size = 0;
1819 *buff = NULL;
1820
1821 /* If we hit end-of-entry last time, return ARCHIVE_EOF. */
1822 if (zip->end_of_entry)
1823 return (ARCHIVE_EOF);
1824
1825 /* Return EOF immediately if this is a non-regular file. */
1826 if (AE_IFREG != (zip->entry->mode & AE_IFMT))
1827 return (ARCHIVE_EOF);
1828
1829 __archive_read_consume(a, zip->unconsumed);
1830 zip->unconsumed = 0;
1831
1832 if (zip->init_decryption) {
1833 zip->has_encrypted_entries = 1;
1834 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
1835 r = read_decryption_header(a);
1836 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
1837 r = init_WinZip_AES_decryption(a);
1838 else
1839 r = init_traditional_PKWARE_decryption(a);
1840 if (r != ARCHIVE_OK)
1841 return (r);
1842 zip->init_decryption = 0;
1843 }
1844
1845 switch(zip->entry->compression) {
1846 case 0: /* No compression. */
1847 r = zip_read_data_none(a, buff, size, offset);
1848 break;
1849 #ifdef HAVE_ZLIB_H
1850 case 8: /* Deflate compression. */
1851 r = zip_read_data_deflate(a, buff, size, offset);
1852 break;
1853 #endif
1854 default: /* Unsupported compression. */
1855 /* Return a warning. */
1856 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1857 "Unsupported ZIP compression method (%s)",
1858 compression_name(zip->entry->compression));
1859 /* We can't decompress this entry, but we will
1860 * be able to skip() it and try the next entry. */
1861 return (ARCHIVE_FAILED);
1862 break;
1863 }
1864 if (r != ARCHIVE_OK)
1865 return (r);
1866 /* Update checksum */
1867 if (*size)
1868 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff,
1869 (unsigned)*size);
1870 /* If we hit the end, swallow any end-of-data marker. */
1871 if (zip->end_of_entry) {
1872 /* Check file size, CRC against these values. */
1873 if (zip->entry->compressed_size !=
1874 zip->entry_compressed_bytes_read) {
1875 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1876 "ZIP compressed data is wrong size "
1877 "(read %jd, expected %jd)",
1878 (intmax_t)zip->entry_compressed_bytes_read,
1879 (intmax_t)zip->entry->compressed_size);
1880 return (ARCHIVE_WARN);
1881 }
1882 /* Size field only stores the lower 32 bits of the actual
1883 * size. */
1884 if ((zip->entry->uncompressed_size & UINT32_MAX)
1885 != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) {
1886 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1887 "ZIP uncompressed data is wrong size "
1888 "(read %jd, expected %jd)\n",
1889 (intmax_t)zip->entry_uncompressed_bytes_read,
1890 (intmax_t)zip->entry->uncompressed_size);
1891 return (ARCHIVE_WARN);
1892 }
1893 /* Check computed CRC against header */
1894 if ((!zip->hctx_valid ||
1895 zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) &&
1896 zip->entry->crc32 != zip->entry_crc32
1897 && !zip->ignore_crc32) {
1898 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1899 "ZIP bad CRC: 0x%lx should be 0x%lx",
1900 (unsigned long)zip->entry_crc32,
1901 (unsigned long)zip->entry->crc32);
1902 return (ARCHIVE_WARN);
1903 }
1904 }
1905
1906 return (ARCHIVE_OK);
1907 }
1908
1909 static int
1910 archive_read_format_zip_cleanup(struct archive_read *a)
1911 {
1912 struct zip *zip;
1913 struct zip_entry *zip_entry, *next_zip_entry;
1914
1915 zip = (struct zip *)(a->format->data);
1916 #ifdef HAVE_ZLIB_H
1917 if (zip->stream_valid)
1918 inflateEnd(&zip->stream);
1919 free(zip->uncompressed_buffer);
1920 #endif
1921 if (zip->zip_entries) {
1922 zip_entry = zip->zip_entries;
1923 while (zip_entry != NULL) {
1924 next_zip_entry = zip_entry->next;
1925 archive_string_free(&zip_entry->rsrcname);
1926 free(zip_entry);
1927 zip_entry = next_zip_entry;
1928 }
1929 }
1930 free(zip->decrypted_buffer);
1931 if (zip->cctx_valid)
1932 archive_decrypto_aes_ctr_release(&zip->cctx);
1933 if (zip->hctx_valid)
1934 archive_hmac_sha1_cleanup(&zip->hctx);
1935 free(zip->iv);
1936 free(zip->erd);
1937 free(zip->v_data);
1938 archive_string_free(&zip->format_name);
1939 free(zip);
1940 (a->format->data) = NULL;
1941 return (ARCHIVE_OK);
1942 }
1943
1944 static int
1945 archive_read_format_zip_has_encrypted_entries(struct archive_read *_a)
1946 {
1947 if (_a && _a->format) {
1948 struct zip * zip = (struct zip *)_a->format->data;
1949 if (zip) {
1950 return zip->has_encrypted_entries;
1951 }
1952 }
1953 return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
1954 }
1955
1956 static int
1957 archive_read_format_zip_options(struct archive_read *a,
1958 const char *key, const char *val)
1959 {
1960 struct zip *zip;
1961 int ret = ARCHIVE_FAILED;
1962
1963 zip = (struct zip *)(a->format->data);
1964 if (strcmp(key, "compat-2x") == 0) {
1965 /* Handle filenames as libarchive 2.x */
1966 zip->init_default_conversion = (val != NULL) ? 1 : 0;
1967 return (ARCHIVE_OK);
1968 } else if (strcmp(key, "hdrcharset") == 0) {
1969 if (val == NULL || val[0] == 0)
1970 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1971 "zip: hdrcharset option needs a character-set name"
1972 );
1973 else {
1974 zip->sconv = archive_string_conversion_from_charset(
1975 &a->archive, val, 0);
1976 if (zip->sconv != NULL) {
1977 if (strcmp(val, "UTF-8") == 0)
1978 zip->sconv_utf8 = zip->sconv;
1979 ret = ARCHIVE_OK;
1980 } else
1981 ret = ARCHIVE_FATAL;
1982 }
1983 return (ret);
1984 } else if (strcmp(key, "ignorecrc32") == 0) {
1985 /* Mostly useful for testing. */
1986 if (val == NULL || val[0] == 0) {
1987 zip->crc32func = real_crc32;
1988 zip->ignore_crc32 = 0;
1989 } else {
1990 zip->crc32func = fake_crc32;
1991 zip->ignore_crc32 = 1;
1992 }
1993 return (ARCHIVE_OK);
1994 } else if (strcmp(key, "mac-ext") == 0) {
1995 zip->process_mac_extensions = (val != NULL && val[0] != 0);
1996 return (ARCHIVE_OK);
1997 }
1998
1999 /* Note: The "warn" return is just to inform the options
2000 * supervisor that we didn't handle it. It will generate
2001 * a suitable error if no one used this option. */
2002 return (ARCHIVE_WARN);
2003 }
2004
2005 int
2006 archive_read_support_format_zip(struct archive *a)
2007 {
2008 int r;
2009 r = archive_read_support_format_zip_streamable(a);
2010 if (r != ARCHIVE_OK)
2011 return r;
2012 return (archive_read_support_format_zip_seekable(a));
2013 }
2014
2015 /* ------------------------------------------------------------------------ */
2016
2017 /*
2018 * Streaming-mode support
2019 */
2020
2021
2022 static int
2023 archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)
2024 {
2025 (void)a; /* UNUSED */
2026 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2027 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2028 }
2029
2030 static int
2031 archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid)
2032 {
2033 const char *p;
2034
2035 (void)best_bid; /* UNUSED */
2036
2037 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2038 return (-1);
2039
2040 /*
2041 * Bid of 29 here comes from:
2042 * + 16 bits for "PK",
2043 * + next 16-bit field has 6 options so contributes
2044 * about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits
2045 *
2046 * So we've effectively verified ~29 total bits of check data.
2047 */
2048 if (p[0] == 'P' && p[1] == 'K') {
2049 if ((p[2] == '\001' && p[3] == '\002')
2050 || (p[2] == '\003' && p[3] == '\004')
2051 || (p[2] == '\005' && p[3] == '\006')
2052 || (p[2] == '\006' && p[3] == '\006')
2053 || (p[2] == '\007' && p[3] == '\010')
2054 || (p[2] == '0' && p[3] == '0'))
2055 return (29);
2056 }
2057
2058 /* TODO: It's worth looking ahead a little bit for a valid
2059 * PK signature. In particular, that would make it possible
2060 * to read some UUEncoded SFX files or SFX files coming from
2061 * a network socket. */
2062
2063 return (0);
2064 }
2065
2066 static int
2067 archive_read_format_zip_streamable_read_header(struct archive_read *a,
2068 struct archive_entry *entry)
2069 {
2070 struct zip *zip;
2071
2072 a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
2073 if (a->archive.archive_format_name == NULL)
2074 a->archive.archive_format_name = "ZIP";
2075
2076 zip = (struct zip *)(a->format->data);
2077
2078 /*
2079 * It should be sufficient to call archive_read_next_header() for
2080 * a reader to determine if an entry is encrypted or not. If the
2081 * encryption of an entry is only detectable when calling
2082 * archive_read_data(), so be it. We'll do the same check there
2083 * as well.
2084 */
2085 if (zip->has_encrypted_entries ==
2086 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
2087 zip->has_encrypted_entries = 0;
2088
2089 /* Make sure we have a zip_entry structure to use. */
2090 if (zip->zip_entries == NULL) {
2091 zip->zip_entries = malloc(sizeof(struct zip_entry));
2092 if (zip->zip_entries == NULL) {
2093 archive_set_error(&a->archive, ENOMEM,
2094 "Out of memory");
2095 return ARCHIVE_FATAL;
2096 }
2097 }
2098 zip->entry = zip->zip_entries;
2099 memset(zip->entry, 0, sizeof(struct zip_entry));
2100
2101 if (zip->cctx_valid)
2102 archive_decrypto_aes_ctr_release(&zip->cctx);
2103 if (zip->hctx_valid)
2104 archive_hmac_sha1_cleanup(&zip->hctx);
2105 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
2106 __archive_read_reset_passphrase(a);
2107
2108 /* Search ahead for the next local file header. */
2109 __archive_read_consume(a, zip->unconsumed);
2110 zip->unconsumed = 0;
2111 for (;;) {
2112 int64_t skipped = 0;
2113 const char *p, *end;
2114 ssize_t bytes;
2115
2116 p = __archive_read_ahead(a, 4, &bytes);
2117 if (p == NULL)
2118 return (ARCHIVE_FATAL);
2119 end = p + bytes;
2120
2121 while (p + 4 <= end) {
2122 if (p[0] == 'P' && p[1] == 'K') {
2123 if (p[2] == '\003' && p[3] == '\004') {
2124 /* Regular file entry. */
2125 __archive_read_consume(a, skipped);
2126 return zip_read_local_file_header(a,
2127 entry, zip);
2128 }
2129
2130 /*
2131 * TODO: We cannot restore permissions
2132 * based only on the local file headers.
2133 * Consider scanning the central
2134 * directory and returning additional
2135 * entries for at least directories.
2136 * This would allow us to properly set
2137 * directory permissions.
2138 *
2139 * This won't help us fix symlinks
2140 * and may not help with regular file
2141 * permissions, either. <sigh>
2142 */
2143 if (p[2] == '\001' && p[3] == '\002') {
2144 return (ARCHIVE_EOF);
2145 }
2146
2147 /* End of central directory? Must be an
2148 * empty archive. */
2149 if ((p[2] == '\005' && p[3] == '\006')
2150 || (p[2] == '\006' && p[3] == '\006'))
2151 return (ARCHIVE_EOF);
2152 }
2153 ++p;
2154 ++skipped;
2155 }
2156 __archive_read_consume(a, skipped);
2157 }
2158 }
2159
2160 static int
2161 archive_read_format_zip_read_data_skip_streamable(struct archive_read *a)
2162 {
2163 struct zip *zip;
2164 int64_t bytes_skipped;
2165
2166 zip = (struct zip *)(a->format->data);
2167 bytes_skipped = __archive_read_consume(a, zip->unconsumed);
2168 zip->unconsumed = 0;
2169 if (bytes_skipped < 0)
2170 return (ARCHIVE_FATAL);
2171
2172 /* If we've already read to end of data, we're done. */
2173 if (zip->end_of_entry)
2174 return (ARCHIVE_OK);
2175
2176 /* So we know we're streaming... */
2177 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2178 || zip->entry->compressed_size > 0) {
2179 /* We know the compressed length, so we can just skip. */
2180 bytes_skipped = __archive_read_consume(a,
2181 zip->entry_bytes_remaining);
2182 if (bytes_skipped < 0)
2183 return (ARCHIVE_FATAL);
2184 return (ARCHIVE_OK);
2185 }
2186
2187 if (zip->init_decryption) {
2188 int r;
2189
2190 zip->has_encrypted_entries = 1;
2191 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
2192 r = read_decryption_header(a);
2193 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
2194 r = init_WinZip_AES_decryption(a);
2195 else
2196 r = init_traditional_PKWARE_decryption(a);
2197 if (r != ARCHIVE_OK)
2198 return (r);
2199 zip->init_decryption = 0;
2200 }
2201
2202 /* We're streaming and we don't know the length. */
2203 /* If the body is compressed and we know the format, we can
2204 * find an exact end-of-entry by decompressing it. */
2205 switch (zip->entry->compression) {
2206 #ifdef HAVE_ZLIB_H
2207 case 8: /* Deflate compression. */
2208 while (!zip->end_of_entry) {
2209 int64_t offset = 0;
2210 const void *buff = NULL;
2211 size_t size = 0;
2212 int r;
2213 r = zip_read_data_deflate(a, &buff, &size, &offset);
2214 if (r != ARCHIVE_OK)
2215 return (r);
2216 }
2217 return ARCHIVE_OK;
2218 #endif
2219 default: /* Uncompressed or unknown. */
2220 /* Scan for a PK\007\010 signature. */
2221 for (;;) {
2222 const char *p, *buff;
2223 ssize_t bytes_avail;
2224 buff = __archive_read_ahead(a, 16, &bytes_avail);
2225 if (bytes_avail < 16) {
2226 archive_set_error(&a->archive,
2227 ARCHIVE_ERRNO_FILE_FORMAT,
2228 "Truncated ZIP file data");
2229 return (ARCHIVE_FATAL);
2230 }
2231 p = buff;
2232 while (p <= buff + bytes_avail - 16) {
2233 if (p[3] == 'P') { p += 3; }
2234 else if (p[3] == 'K') { p += 2; }
2235 else if (p[3] == '\007') { p += 1; }
2236 else if (p[3] == '\010' && p[2] == '\007'
2237 && p[1] == 'K' && p[0] == 'P') {
2238 if (zip->entry->flags & LA_USED_ZIP64)
2239 __archive_read_consume(a,
2240 p - buff + 24);
2241 else
2242 __archive_read_consume(a,
2243 p - buff + 16);
2244 return ARCHIVE_OK;
2245 } else { p += 4; }
2246 }
2247 __archive_read_consume(a, p - buff);
2248 }
2249 }
2250 }
2251
2252 int
2253 archive_read_support_format_zip_streamable(struct archive *_a)
2254 {
2255 struct archive_read *a = (struct archive_read *)_a;
2256 struct zip *zip;
2257 int r;
2258
2259 archive_check_magic(_a, ARCHIVE_READ_MAGIC,
2260 ARCHIVE_STATE_NEW, "archive_read_support_format_zip");
2261
2262 zip = (struct zip *)calloc(1, sizeof(*zip));
2263 if (zip == NULL) {
2264 archive_set_error(&a->archive, ENOMEM,
2265 "Can't allocate zip data");
2266 return (ARCHIVE_FATAL);
2267 }
2268
2269 /* Streamable reader doesn't support mac extensions. */
2270 zip->process_mac_extensions = 0;
2271
2272 /*
2273 * Until enough data has been read, we cannot tell about
2274 * any encrypted entries yet.
2275 */
2276 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
2277 zip->crc32func = real_crc32;
2278
2279 r = __archive_read_register_format(a,
2280 zip,
2281 "zip",
2282 archive_read_format_zip_streamable_bid,
2283 archive_read_format_zip_options,
2284 archive_read_format_zip_streamable_read_header,
2285 archive_read_format_zip_read_data,
2286 archive_read_format_zip_read_data_skip_streamable,
2287 NULL,
2288 archive_read_format_zip_cleanup,
2289 archive_read_support_format_zip_capabilities_streamable,
2290 archive_read_format_zip_has_encrypted_entries);
2291
2292 if (r != ARCHIVE_OK)
2293 free(zip);
2294 return (ARCHIVE_OK);
2295 }
2296
2297 /* ------------------------------------------------------------------------ */
2298
2299 /*
2300 * Seeking-mode support
2301 */
2302
2303 static int
2304 archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)
2305 {
2306 (void)a; /* UNUSED */
2307 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
2308 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
2309 }
2310
2311 /*
2312 * TODO: This is a performance sink because it forces the read core to
2313 * drop buffered data from the start of file, which will then have to
2314 * be re-read again if this bidder loses.
2315 *
2316 * We workaround this a little by passing in the best bid so far so
2317 * that later bidders can do nothing if they know they'll never
2318 * outbid. But we can certainly do better...
2319 */
2320 static int
2321 read_eocd(struct zip *zip, const char *p, int64_t current_offset)
2322 {
2323 /* Sanity-check the EOCD we've found. */
2324
2325 /* This must be the first volume. */
2326 if (archive_le16dec(p + 4) != 0)
2327 return 0;
2328 /* Central directory must be on this volume. */
2329 if (archive_le16dec(p + 4) != archive_le16dec(p + 6))
2330 return 0;
2331 /* All central directory entries must be on this volume. */
2332 if (archive_le16dec(p + 10) != archive_le16dec(p + 8))
2333 return 0;
2334 /* Central directory can't extend beyond start of EOCD record. */
2335 if (archive_le32dec(p + 16) + archive_le32dec(p + 12)
2336 > current_offset)
2337 return 0;
2338
2339 /* Save the central directory location for later use. */
2340 zip->central_directory_offset = archive_le32dec(p + 16);
2341
2342 /* This is just a tiny bit higher than the maximum
2343 returned by the streaming Zip bidder. This ensures
2344 that the more accurate seeking Zip parser wins
2345 whenever seek is available. */
2346 return 32;
2347 }
2348
2349 /*
2350 * Examine Zip64 EOCD locator: If it's valid, store the information
2351 * from it.
2352 */
2353 static void
2354 read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p)
2355 {
2356 int64_t eocd64_offset;
2357 int64_t eocd64_size;
2358
2359 /* Sanity-check the locator record. */
2360
2361 /* Central dir must be on first volume. */
2362 if (archive_le32dec(p + 4) != 0)
2363 return;
2364 /* Must be only a single volume. */
2365 if (archive_le32dec(p + 16) != 1)
2366 return;
2367
2368 /* Find the Zip64 EOCD record. */
2369 eocd64_offset = archive_le64dec(p + 8);
2370 if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0)
2371 return;
2372 if ((p = __archive_read_ahead(a, 56, NULL)) == NULL)
2373 return;
2374 /* Make sure we can read all of it. */
2375 eocd64_size = archive_le64dec(p + 4) + 12;
2376 if (eocd64_size < 56 || eocd64_size > 16384)
2377 return;
2378 if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL)
2379 return;
2380
2381 /* Sanity-check the EOCD64 */
2382 if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */
2383 return;
2384 if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */
2385 return;
2386 /* CD can't be split. */
2387 if (archive_le64dec(p + 24) != archive_le64dec(p + 32))
2388 return;
2389
2390 /* Save the central directory offset for later use. */
2391 zip->central_directory_offset = archive_le64dec(p + 48);
2392 }
2393
2394 static int
2395 archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid)
2396 {
2397 struct zip *zip = (struct zip *)a->format->data;
2398 int64_t file_size, current_offset;
2399 const char *p;
2400 int i, tail;
2401
2402 /* If someone has already bid more than 32, then avoid
2403 trashing the look-ahead buffers with a seek. */
2404 if (best_bid > 32)
2405 return (-1);
2406
2407 file_size = __archive_read_seek(a, 0, SEEK_END);
2408 if (file_size <= 0)
2409 return 0;
2410
2411 /* Search last 16k of file for end-of-central-directory
2412 * record (which starts with PK\005\006) */
2413 tail = (int)zipmin(1024 * 16, file_size);
2414 current_offset = __archive_read_seek(a, -tail, SEEK_END);
2415 if (current_offset < 0)
2416 return 0;
2417 if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL)
2418 return 0;
2419 /* Boyer-Moore search backwards from the end, since we want
2420 * to match the last EOCD in the file (there can be more than
2421 * one if there is an uncompressed Zip archive as a member
2422 * within this Zip archive). */
2423 for (i = tail - 22; i > 0;) {
2424 switch (p[i]) {
2425 case 'P':
2426 if (memcmp(p + i, "PK\005\006", 4) == 0) {
2427 int ret = read_eocd(zip, p + i,
2428 current_offset + i);
2429 if (ret > 0) {
2430 /* Zip64 EOCD locator precedes
2431 * regular EOCD if present. */
2432 if (i >= 20
2433 && memcmp(p + i - 20, "PK\006\007", 4) == 0) {
2434 read_zip64_eocd(a, zip, p + i - 20);
2435 }
2436 return (ret);
2437 }
2438 }
2439 i -= 4;
2440 break;
2441 case 'K': i -= 1; break;
2442 case 005: i -= 2; break;
2443 case 006: i -= 3; break;
2444 default: i -= 4; break;
2445 }
2446 }
2447 return 0;
2448 }
2449
2450 /* The red-black trees are only used in seeking mode to manage
2451 * the in-memory copy of the central directory. */
2452
2453 static int
2454 cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2)
2455 {
2456 const struct zip_entry *e1 = (const struct zip_entry *)n1;
2457 const struct zip_entry *e2 = (const struct zip_entry *)n2;
2458
2459 if (e1->local_header_offset > e2->local_header_offset)
2460 return -1;
2461 if (e1->local_header_offset < e2->local_header_offset)
2462 return 1;
2463 return 0;
2464 }
2465
2466 static int
2467 cmp_key(const struct archive_rb_node *n, const void *key)
2468 {
2469 /* This function won't be called */
2470 (void)n; /* UNUSED */
2471 (void)key; /* UNUSED */
2472 return 1;
2473 }
2474
2475 static const struct archive_rb_tree_ops rb_ops = {
2476 &cmp_node, &cmp_key
2477 };
2478
2479 static int
2480 rsrc_cmp_node(const struct archive_rb_node *n1,
2481 const struct archive_rb_node *n2)
2482 {
2483 const struct zip_entry *e1 = (const struct zip_entry *)n1;
2484 const struct zip_entry *e2 = (const struct zip_entry *)n2;
2485
2486 return (strcmp(e2->rsrcname.s, e1->rsrcname.s));
2487 }
2488
2489 static int
2490 rsrc_cmp_key(const struct archive_rb_node *n, const void *key)
2491 {
2492 const struct zip_entry *e = (const struct zip_entry *)n;
2493 return (strcmp((const char *)key, e->rsrcname.s));
2494 }
2495
2496 static const struct archive_rb_tree_ops rb_rsrc_ops = {
2497 &rsrc_cmp_node, &rsrc_cmp_key
2498 };
2499
2500 static const char *
2501 rsrc_basename(const char *name, size_t name_length)
2502 {
2503 const char *s, *r;
2504
2505 r = s = name;
2506 for (;;) {
2507 s = memchr(s, '/', name_length - (s - name));
2508 if (s == NULL)
2509 break;
2510 r = ++s;
2511 }
2512 return (r);
2513 }
2514
2515 static void
2516 expose_parent_dirs(struct zip *zip, const char *name, size_t name_length)
2517 {
2518 struct archive_string str;
2519 struct zip_entry *dir;
2520 char *s;
2521
2522 archive_string_init(&str);
2523 archive_strncpy(&str, name, name_length);
2524 for (;;) {
2525 s = strrchr(str.s, '/');
2526 if (s == NULL)
2527 break;
2528 *s = '\0';
2529 /* Transfer the parent directory from zip->tree_rsrc RB
2530 * tree to zip->tree RB tree to expose. */
2531 dir = (struct zip_entry *)
2532 __archive_rb_tree_find_node(&zip->tree_rsrc, str.s);
2533 if (dir == NULL)
2534 break;
2535 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node);
2536 archive_string_free(&dir->rsrcname);
2537 __archive_rb_tree_insert_node(&zip->tree, &dir->node);
2538 }
2539 archive_string_free(&str);
2540 }
2541
2542 static int
2543 slurp_central_directory(struct archive_read *a, struct zip *zip)
2544 {
2545 ssize_t i;
2546 unsigned found;
2547 int64_t correction;
2548 ssize_t bytes_avail;
2549 const char *p;
2550
2551 /*
2552 * Find the start of the central directory. The end-of-CD
2553 * record has our starting point, but there are lots of
2554 * Zip archives which have had other data prepended to the
2555 * file, which makes the recorded offsets all too small.
2556 * So we search forward from the specified offset until we
2557 * find the real start of the central directory. Then we
2558 * know the correction we need to apply to account for leading
2559 * padding.
2560 */
2561 if (__archive_read_seek(a, zip->central_directory_offset, SEEK_SET) < 0)
2562 return ARCHIVE_FATAL;
2563
2564 found = 0;
2565 while (!found) {
2566 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL)
2567 return ARCHIVE_FATAL;
2568 for (found = 0, i = 0; !found && i < bytes_avail - 4;) {
2569 switch (p[i + 3]) {
2570 case 'P': i += 3; break;
2571 case 'K': i += 2; break;
2572 case 001: i += 1; break;
2573 case 002:
2574 if (memcmp(p + i, "PK\001\002", 4) == 0) {
2575 p += i;
2576 found = 1;
2577 } else
2578 i += 4;
2579 break;
2580 case 005: i += 1; break;
2581 case 006:
2582 if (memcmp(p + i, "PK\005\006", 4) == 0) {
2583 p += i;
2584 found = 1;
2585 } else if (memcmp(p + i, "PK\006\006", 4) == 0) {
2586 p += i;
2587 found = 1;
2588 } else
2589 i += 1;
2590 break;
2591 default: i += 4; break;
2592 }
2593 }
2594 __archive_read_consume(a, i);
2595 }
2596 correction = archive_filter_bytes(&a->archive, 0)
2597 - zip->central_directory_offset;
2598
2599 __archive_rb_tree_init(&zip->tree, &rb_ops);
2600 __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops);
2601
2602 zip->central_directory_entries_total = 0;
2603 while (1) {
2604 struct zip_entry *zip_entry;
2605 size_t filename_length, extra_length, comment_length;
2606 uint32_t external_attributes;
2607 const char *name, *r;
2608
2609 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
2610 return ARCHIVE_FATAL;
2611 if (memcmp(p, "PK\006\006", 4) == 0
2612 || memcmp(p, "PK\005\006", 4) == 0) {
2613 break;
2614 } else if (memcmp(p, "PK\001\002", 4) != 0) {
2615 archive_set_error(&a->archive,
2616 -1, "Invalid central directory signature");
2617 return ARCHIVE_FATAL;
2618 }
2619 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL)
2620 return ARCHIVE_FATAL;
2621
2622 zip_entry = calloc(1, sizeof(struct zip_entry));
2623 zip_entry->next = zip->zip_entries;
2624 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY;
2625 zip->zip_entries = zip_entry;
2626 zip->central_directory_entries_total++;
2627
2628 /* version = p[4]; */
2629 zip_entry->system = p[5];
2630 /* version_required = archive_le16dec(p + 6); */
2631 zip_entry->zip_flags = archive_le16dec(p + 8);
2632 if (zip_entry->zip_flags
2633 & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){
2634 zip->has_encrypted_entries = 1;
2635 }
2636 zip_entry->compression = (char)archive_le16dec(p + 10);
2637 zip_entry->mtime = zip_time(p + 12);
2638 zip_entry->crc32 = archive_le32dec(p + 16);
2639 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
2640 zip_entry->decdat = p[13];
2641 else
2642 zip_entry->decdat = p[19];
2643 zip_entry->compressed_size = archive_le32dec(p + 20);
2644 zip_entry->uncompressed_size = archive_le32dec(p + 24);
2645 filename_length = archive_le16dec(p + 28);
2646 extra_length = archive_le16dec(p + 30);
2647 comment_length = archive_le16dec(p + 32);
2648 /* disk_start = archive_le16dec(p + 34); */ /* Better be zero. */
2649 /* internal_attributes = archive_le16dec(p + 36); */ /* text bit */
2650 external_attributes = archive_le32dec(p + 38);
2651 zip_entry->local_header_offset =
2652 archive_le32dec(p + 42) + correction;
2653
2654 /* If we can't guess the mode, leave it zero here;
2655 when we read the local file header we might get
2656 more information. */
2657 if (zip_entry->system == 3) {
2658 zip_entry->mode = external_attributes >> 16;
2659 } else if (zip_entry->system == 0) {
2660 // Interpret MSDOS directory bit
2661 if (0x10 == (external_attributes & 0x10)) {
2662 zip_entry->mode = AE_IFDIR | 0775;
2663 } else {
2664 zip_entry->mode = AE_IFREG | 0664;
2665 }
2666 if (0x01 == (external_attributes & 0x01)) {
2667 // Read-only bit; strip write permissions
2668 zip_entry->mode &= 0555;
2669 }
2670 } else {
2671 zip_entry->mode = 0;
2672 }
2673
2674 /* We're done with the regular data; get the filename and
2675 * extra data. */
2676 __archive_read_consume(a, 46);
2677 p = __archive_read_ahead(a, filename_length + extra_length,
2678 NULL);
2679 if (p == NULL) {
2680 archive_set_error(&a->archive,
2681 ARCHIVE_ERRNO_FILE_FORMAT,
2682 "Truncated ZIP file header");
2683 return ARCHIVE_FATAL;
2684 }
2685 process_extra(p + filename_length, extra_length, zip_entry);
2686
2687 /*
2688 * Mac resource fork files are stored under the
2689 * "__MACOSX/" directory, so we should check if
2690 * it is.
2691 */
2692 if (!zip->process_mac_extensions) {
2693 /* Treat every entry as a regular entry. */
2694 __archive_rb_tree_insert_node(&zip->tree,
2695 &zip_entry->node);
2696 } else {
2697 name = p;
2698 r = rsrc_basename(name, filename_length);
2699 if (filename_length >= 9 &&
2700 strncmp("__MACOSX/", name, 9) == 0) {
2701 /* If this file is not a resource fork nor
2702 * a directory. We should treat it as a non
2703 * resource fork file to expose it. */
2704 if (name[filename_length-1] != '/' &&
2705 (r - name < 3 || r[0] != '.' || r[1] != '_')) {
2706 __archive_rb_tree_insert_node(
2707 &zip->tree, &zip_entry->node);
2708 /* Expose its parent directories. */
2709 expose_parent_dirs(zip, name,
2710 filename_length);
2711 } else {
2712 /* This file is a resource fork file or
2713 * a directory. */
2714 archive_strncpy(&(zip_entry->rsrcname),
2715 name, filename_length);
2716 __archive_rb_tree_insert_node(
2717 &zip->tree_rsrc, &zip_entry->node);
2718 }
2719 } else {
2720 /* Generate resource fork name to find its
2721 * resource file at zip->tree_rsrc. */
2722 archive_strcpy(&(zip_entry->rsrcname),
2723 "__MACOSX/");
2724 archive_strncat(&(zip_entry->rsrcname),
2725 name, r - name);
2726 archive_strcat(&(zip_entry->rsrcname), "._");
2727 archive_strncat(&(zip_entry->rsrcname),
2728 name + (r - name),
2729 filename_length - (r - name));
2730 /* Register an entry to RB tree to sort it by
2731 * file offset. */
2732 __archive_rb_tree_insert_node(&zip->tree,
2733 &zip_entry->node);
2734 }
2735 }
2736
2737 /* Skip the comment too ... */
2738 __archive_read_consume(a,
2739 filename_length + extra_length + comment_length);
2740 }
2741
2742 return ARCHIVE_OK;
2743 }
2744
2745 static ssize_t
2746 zip_get_local_file_header_size(struct archive_read *a, size_t extra)
2747 {
2748 const char *p;
2749 ssize_t filename_length, extra_length;
2750
2751 if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) {
2752 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2753 "Truncated ZIP file header");
2754 return (ARCHIVE_WARN);
2755 }
2756 p += extra;
2757
2758 if (memcmp(p, "PK\003\004", 4) != 0) {
2759 archive_set_error(&a->archive, -1, "Damaged Zip archive");
2760 return ARCHIVE_WARN;
2761 }
2762 filename_length = archive_le16dec(p + 26);
2763 extra_length = archive_le16dec(p + 28);
2764
2765 return (30 + filename_length + extra_length);
2766 }
2767
2768 static int
2769 zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
2770 struct zip_entry *rsrc)
2771 {
2772 struct zip *zip = (struct zip *)a->format->data;
2773 unsigned char *metadata, *mp;
2774 int64_t offset = archive_filter_bytes(&a->archive, 0);
2775 size_t remaining_bytes, metadata_bytes;
2776 ssize_t hsize;
2777 int ret = ARCHIVE_OK, eof;
2778
2779 switch(rsrc->compression) {
2780 case 0: /* No compression. */
2781 if (rsrc->uncompressed_size != rsrc->compressed_size) {
2782 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2783 "Malformed OS X metadata entry: inconsistent size");
2784 return (ARCHIVE_FATAL);
2785 }
2786 #ifdef HAVE_ZLIB_H
2787 case 8: /* Deflate compression. */
2788 #endif
2789 break;
2790 default: /* Unsupported compression. */
2791 /* Return a warning. */
2792 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2793 "Unsupported ZIP compression method (%s)",
2794 compression_name(rsrc->compression));
2795 /* We can't decompress this entry, but we will
2796 * be able to skip() it and try the next entry. */
2797 return (ARCHIVE_WARN);
2798 }
2799
2800 if (rsrc->uncompressed_size > (4 * 1024 * 1024)) {
2801 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2802 "Mac metadata is too large: %jd > 4M bytes",
2803 (intmax_t)rsrc->uncompressed_size);
2804 return (ARCHIVE_WARN);
2805 }
2806 if (rsrc->compressed_size > (4 * 1024 * 1024)) {
2807 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2808 "Mac metadata is too large: %jd > 4M bytes",
2809 (intmax_t)rsrc->compressed_size);
2810 return (ARCHIVE_WARN);
2811 }
2812
2813 metadata = malloc((size_t)rsrc->uncompressed_size);
2814 if (metadata == NULL) {
2815 archive_set_error(&a->archive, ENOMEM,
2816 "Can't allocate memory for Mac metadata");
2817 return (ARCHIVE_FATAL);
2818 }
2819
2820 if (offset < rsrc->local_header_offset)
2821 __archive_read_consume(a, rsrc->local_header_offset - offset);
2822 else if (offset != rsrc->local_header_offset) {
2823 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET);
2824 }
2825
2826 hsize = zip_get_local_file_header_size(a, 0);
2827 __archive_read_consume(a, hsize);
2828
2829 remaining_bytes = (size_t)rsrc->compressed_size;
2830 metadata_bytes = (size_t)rsrc->uncompressed_size;
2831 mp = metadata;
2832 eof = 0;
2833 while (!eof && remaining_bytes) {
2834 const unsigned char *p;
2835 ssize_t bytes_avail;
2836 size_t bytes_used;
2837
2838 p = __archive_read_ahead(a, 1, &bytes_avail);
2839 if (p == NULL) {
2840 archive_set_error(&a->archive,
2841 ARCHIVE_ERRNO_FILE_FORMAT,
2842 "Truncated ZIP file header");
2843 ret = ARCHIVE_WARN;
2844 goto exit_mac_metadata;
2845 }
2846 if ((size_t)bytes_avail > remaining_bytes)
2847 bytes_avail = remaining_bytes;
2848 switch(rsrc->compression) {
2849 case 0: /* No compression. */
2850 if ((size_t)bytes_avail > metadata_bytes)
2851 bytes_avail = metadata_bytes;
2852 memcpy(mp, p, bytes_avail);
2853 bytes_used = (size_t)bytes_avail;
2854 metadata_bytes -= bytes_used;
2855 mp += bytes_used;
2856 if (metadata_bytes == 0)
2857 eof = 1;
2858 break;
2859 #ifdef HAVE_ZLIB_H
2860 case 8: /* Deflate compression. */
2861 {
2862 int r;
2863
2864 ret = zip_deflate_init(a, zip);
2865 if (ret != ARCHIVE_OK)
2866 goto exit_mac_metadata;
2867 zip->stream.next_in =
2868 (Bytef *)(uintptr_t)(const void *)p;
2869 zip->stream.avail_in = (uInt)bytes_avail;
2870 zip->stream.total_in = 0;
2871 zip->stream.next_out = mp;
2872 zip->stream.avail_out = (uInt)metadata_bytes;
2873 zip->stream.total_out = 0;
2874
2875 r = inflate(&zip->stream, 0);
2876 switch (r) {
2877 case Z_OK:
2878 break;
2879 case Z_STREAM_END:
2880 eof = 1;
2881 break;
2882 case Z_MEM_ERROR:
2883 archive_set_error(&a->archive, ENOMEM,
2884 "Out of memory for ZIP decompression");
2885 ret = ARCHIVE_FATAL;
2886 goto exit_mac_metadata;
2887 default:
2888 archive_set_error(&a->archive,
2889 ARCHIVE_ERRNO_MISC,
2890 "ZIP decompression failed (%d)", r);
2891 ret = ARCHIVE_FATAL;
2892 goto exit_mac_metadata;
2893 }
2894 bytes_used = zip->stream.total_in;
2895 metadata_bytes -= zip->stream.total_out;
2896 mp += zip->stream.total_out;
2897 break;
2898 }
2899 #endif
2900 default:
2901 bytes_used = 0;
2902 break;
2903 }
2904 __archive_read_consume(a, bytes_used);
2905 remaining_bytes -= bytes_used;
2906 }
2907 archive_entry_copy_mac_metadata(entry, metadata,
2908 (size_t)rsrc->uncompressed_size - metadata_bytes);
2909
2910 exit_mac_metadata:
2911 __archive_read_seek(a, offset, SEEK_SET);
2912 zip->decompress_init = 0;
2913 free(metadata);
2914 return (ret);
2915 }
2916
2917 static int
2918 archive_read_format_zip_seekable_read_header(struct archive_read *a,
2919 struct archive_entry *entry)
2920 {
2921 struct zip *zip = (struct zip *)a->format->data;
2922 struct zip_entry *rsrc;
2923 int64_t offset;
2924 int r, ret = ARCHIVE_OK;
2925
2926 /*
2927 * It should be sufficient to call archive_read_next_header() for
2928 * a reader to determine if an entry is encrypted or not. If the
2929 * encryption of an entry is only detectable when calling
2930 * archive_read_data(), so be it. We'll do the same check there
2931 * as well.
2932 */
2933 if (zip->has_encrypted_entries ==
2934 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
2935 zip->has_encrypted_entries = 0;
2936
2937 a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
2938 if (a->archive.archive_format_name == NULL)
2939 a->archive.archive_format_name = "ZIP";
2940
2941 if (zip->zip_entries == NULL) {
2942 r = slurp_central_directory(a, zip);
2943 if (r != ARCHIVE_OK)
2944 return r;
2945 /* Get first entry whose local header offset is lower than
2946 * other entries in the archive file. */
2947 zip->entry =
2948 (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree);
2949 } else if (zip->entry != NULL) {
2950 /* Get next entry in local header offset order. */
2951 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate(
2952 &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT);
2953 }
2954
2955 if (zip->entry == NULL)
2956 return ARCHIVE_EOF;
2957
2958 if (zip->entry->rsrcname.s)
2959 rsrc = (struct zip_entry *)__archive_rb_tree_find_node(
2960 &zip->tree_rsrc, zip->entry->rsrcname.s);
2961 else
2962 rsrc = NULL;
2963
2964 if (zip->cctx_valid)
2965 archive_decrypto_aes_ctr_release(&zip->cctx);
2966 if (zip->hctx_valid)
2967 archive_hmac_sha1_cleanup(&zip->hctx);
2968 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
2969 __archive_read_reset_passphrase(a);
2970
2971 /* File entries are sorted by the header offset, we should mostly
2972 * use __archive_read_consume to advance a read point to avoid redundant
2973 * data reading. */
2974 offset = archive_filter_bytes(&a->archive, 0);
2975 if (offset < zip->entry->local_header_offset)
2976 __archive_read_consume(a,
2977 zip->entry->local_header_offset - offset);
2978 else if (offset != zip->entry->local_header_offset) {
2979 __archive_read_seek(a, zip->entry->local_header_offset,
2980 SEEK_SET);
2981 }
2982 zip->unconsumed = 0;
2983 r = zip_read_local_file_header(a, entry, zip);
2984 if (r != ARCHIVE_OK)
2985 return r;
2986 if (rsrc) {
2987 int ret2 = zip_read_mac_metadata(a, entry, rsrc);
2988 if (ret2 < ret)
2989 ret = ret2;
2990 }
2991 return (ret);
2992 }
2993
2994 /*
2995 * We're going to seek for the next header anyway, so we don't
2996 * need to bother doing anything here.
2997 */
2998 static int
2999 archive_read_format_zip_read_data_skip_seekable(struct archive_read *a)
3000 {
3001 struct zip *zip;
3002 zip = (struct zip *)(a->format->data);
3003
3004 zip->unconsumed = 0;
3005 return (ARCHIVE_OK);
3006 }
3007
3008 int
3009 archive_read_support_format_zip_seekable(struct archive *_a)
3010 {
3011 struct archive_read *a = (struct archive_read *)_a;
3012 struct zip *zip;
3013 int r;
3014
3015 archive_check_magic(_a, ARCHIVE_READ_MAGIC,
3016 ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable");
3017
3018 zip = (struct zip *)calloc(1, sizeof(*zip));
3019 if (zip == NULL) {
3020 archive_set_error(&a->archive, ENOMEM,
3021 "Can't allocate zip data");
3022 return (ARCHIVE_FATAL);
3023 }
3024
3025 #ifdef HAVE_COPYFILE_H
3026 /* Set this by default on Mac OS. */
3027 zip->process_mac_extensions = 1;
3028 #endif
3029
3030 /*
3031 * Until enough data has been read, we cannot tell about
3032 * any encrypted entries yet.
3033 */
3034 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
3035 zip->crc32func = real_crc32;
3036
3037 r = __archive_read_register_format(a,
3038 zip,
3039 "zip",
3040 archive_read_format_zip_seekable_bid,
3041 archive_read_format_zip_options,
3042 archive_read_format_zip_seekable_read_header,
3043 archive_read_format_zip_read_data,
3044 archive_read_format_zip_read_data_skip_seekable,
3045 NULL,
3046 archive_read_format_zip_cleanup,
3047 archive_read_support_format_zip_capabilities_seekable,
3048 archive_read_format_zip_has_encrypted_entries);
3049
3050 if (r != ARCHIVE_OK)
3051 free(zip);
3052 return (ARCHIVE_OK);
3053 }
DragonFly BSD