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Tohur
2025-11-18 14:18:26 -07:00
parent 33eb6e3707
commit 27277ec342
6106 changed files with 3571167 additions and 0 deletions
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262
3rdparty/libzip/lib/zip_source_pkware_encode.c vendored Normal file
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/*
zip_source_pkware_encode.c -- Traditional PKWARE encryption routines
Copyright (C) 2009-2024 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <info@libzip.org>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. The names of the authors may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <string.h>
#include "zipint.h"
struct trad_pkware {
char *password;
zip_pkware_keys_t keys;
zip_buffer_t *buffer;
bool eof;
zip_dostime_t dostime;
zip_error_t error;
};
static int encrypt_header(zip_source_t *, struct trad_pkware *);
static zip_int64_t pkware_encrypt(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t);
static void trad_pkware_free(struct trad_pkware *);
static struct trad_pkware *trad_pkware_new(const char *password, zip_error_t *error);
zip_source_t *
zip_source_pkware_encode(zip_t *za, zip_source_t *src, zip_uint16_t em, int flags, const char *password) {
struct trad_pkware *ctx;
zip_source_t *s2;
if (password == NULL || src == NULL || em != ZIP_EM_TRAD_PKWARE) {
zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return NULL;
}
if (!(flags & ZIP_CODEC_ENCODE)) {
zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0);
return NULL;
}
if ((ctx = trad_pkware_new(password, &za->error)) == NULL) {
zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
return NULL;
}
if (zip_source_get_dos_time(src, &ctx->dostime) <= 0) {
zip_stat_t st;
if (zip_source_stat(src, &st) < 0) {
zip_error_set_from_source(&za->error, src);
trad_pkware_free(ctx);
return NULL;
}
if (_zip_u2d_time((st.valid & ZIP_STAT_MTIME) ? st.mtime : time(NULL), &ctx->dostime, &za->error) < 0) {
trad_pkware_free(ctx);
return NULL;
}
}
if ((s2 = zip_source_layered(za, src, pkware_encrypt, ctx)) == NULL) {
trad_pkware_free(ctx);
return NULL;
}
return s2;
}
static int
encrypt_header(zip_source_t *src, struct trad_pkware *ctx) {
zip_uint8_t *header;
if ((ctx->buffer = _zip_buffer_new(NULL, ZIP_CRYPTO_PKWARE_HEADERLEN)) == NULL) {
zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
return -1;
}
header = _zip_buffer_data(ctx->buffer);
/* generate header from random bytes and mtime
see appnote.iz, XIII. Decryption, Step 2, last paragraph */
if (!zip_secure_random(header, ZIP_CRYPTO_PKWARE_HEADERLEN - 1)) {
zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
_zip_buffer_free(ctx->buffer);
ctx->buffer = NULL;
return -1;
}
header[ZIP_CRYPTO_PKWARE_HEADERLEN - 1] = (zip_uint8_t)((ctx->dostime.time >> 8) & 0xff);
_zip_pkware_encrypt(&ctx->keys, header, header, ZIP_CRYPTO_PKWARE_HEADERLEN);
return 0;
}
static zip_int64_t
pkware_encrypt(zip_source_t *src, void *ud, void *data, zip_uint64_t length, zip_source_cmd_t cmd) {
struct trad_pkware *ctx;
zip_int64_t n;
zip_uint64_t buffer_n;
ctx = (struct trad_pkware *)ud;
switch (cmd) {
case ZIP_SOURCE_OPEN:
ctx->eof = false;
/* initialize keys */
_zip_pkware_keys_reset(&ctx->keys);
_zip_pkware_encrypt(&ctx->keys, NULL, (const zip_uint8_t *)ctx->password, strlen(ctx->password));
if (encrypt_header(src, ctx) < 0) {
return -1;
}
return 0;
case ZIP_SOURCE_READ:
buffer_n = 0;
if (ctx->buffer) {
/* write header values to data */
buffer_n = _zip_buffer_read(ctx->buffer, data, length);
data = (zip_uint8_t *)data + buffer_n;
length -= buffer_n;
if (_zip_buffer_eof(ctx->buffer)) {
_zip_buffer_free(ctx->buffer);
ctx->buffer = NULL;
}
}
if (ctx->eof) {
return (zip_int64_t)buffer_n;
}
if ((n = zip_source_read(src, data, length)) < 0) {
zip_error_set_from_source(&ctx->error, src);
return -1;
}
_zip_pkware_encrypt(&ctx->keys, (zip_uint8_t *)data, (zip_uint8_t *)data, (zip_uint64_t)n);
if ((zip_uint64_t)n < length) {
ctx->eof = true;
}
return (zip_int64_t)buffer_n + n;
case ZIP_SOURCE_CLOSE:
_zip_buffer_free(ctx->buffer);
ctx->buffer = NULL;
return 0;
case ZIP_SOURCE_STAT: {
zip_stat_t *st;
st = (zip_stat_t *)data;
st->encryption_method = ZIP_EM_TRAD_PKWARE;
st->valid |= ZIP_STAT_ENCRYPTION_METHOD;
if (st->valid & ZIP_STAT_COMP_SIZE) {
st->comp_size += ZIP_CRYPTO_PKWARE_HEADERLEN;
}
return 0;
}
case ZIP_SOURCE_GET_FILE_ATTRIBUTES: {
zip_file_attributes_t *attributes = (zip_file_attributes_t *)data;
if (length < sizeof(*attributes)) {
zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
return -1;
}
attributes->valid |= ZIP_FILE_ATTRIBUTES_VERSION_NEEDED;
attributes->version_needed = 20;
return 0;
}
case ZIP_SOURCE_GET_DOS_TIME:
if (length < sizeof(ctx->dostime)) {
zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
return -1;
}
(void)memcpy_s(data, sizeof(ctx->dostime), &ctx->dostime, sizeof(ctx->dostime));
return sizeof(ctx->dostime);
case ZIP_SOURCE_SUPPORTS:
return zip_source_make_command_bitmap(ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_CLOSE, ZIP_SOURCE_STAT, ZIP_SOURCE_ERROR, ZIP_SOURCE_FREE, ZIP_SOURCE_GET_FILE_ATTRIBUTES, ZIP_SOURCE_GET_DOS_TIME, -1);
case ZIP_SOURCE_ERROR:
return zip_error_to_data(&ctx->error, data, length);
case ZIP_SOURCE_FREE:
trad_pkware_free(ctx);
return 0;
default:
return zip_source_pass_to_lower_layer(src, data, length, cmd);
}
}
static struct trad_pkware *
trad_pkware_new(const char *password, zip_error_t *error) {
struct trad_pkware *ctx;
if ((ctx = (struct trad_pkware *)malloc(sizeof(*ctx))) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
if ((ctx->password = strdup(password)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
free(ctx);
return NULL;
}
ctx->buffer = NULL;
zip_error_init(&ctx->error);
return ctx;
}
static void
trad_pkware_free(struct trad_pkware *ctx) {
if (ctx == NULL) {
return;
}
free(ctx->password);
_zip_buffer_free(ctx->buffer);
zip_error_fini(&ctx->error);
free(ctx);
}