mirror of https://github.com/PCSX2/pcsx2.git
272 lines
7.8 KiB
C
272 lines
7.8 KiB
C
/*
|
|
zip_source_pkware_encode.c -- Traditional PKWARE encryption routines
|
|
Copyright (C) 2009-2020 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;
|
|
bool mtime_set;
|
|
time_t mtime;
|
|
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);
|
|
static void set_mtime(struct trad_pkware* ctx, zip_stat_t* st);
|
|
|
|
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) {
|
|
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) {
|
|
unsigned short dostime, dosdate;
|
|
zip_uint8_t *header;
|
|
|
|
if (!ctx->mtime_set) {
|
|
struct zip_stat st;
|
|
if (zip_source_stat(src, &st) != 0) {
|
|
zip_error_set_from_source(&ctx->error, src);
|
|
return -1;
|
|
}
|
|
set_mtime(ctx, &st);
|
|
}
|
|
|
|
_zip_u2d_time(ctx->mtime, &dostime, &dosdate);
|
|
|
|
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)((dostime >> 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;
|
|
}
|
|
set_mtime(ctx, st);
|
|
st->mtime = ctx->mtime;
|
|
st->valid |= ZIP_STAT_MTIME;
|
|
|
|
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_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, -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;
|
|
ctx->mtime_set = false;
|
|
ctx->mtime = 0;
|
|
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);
|
|
}
|
|
|
|
|
|
static void set_mtime(struct trad_pkware* ctx, zip_stat_t* st) {
|
|
if (!ctx->mtime_set) {
|
|
if (st->valid & ZIP_STAT_MTIME) {
|
|
ctx->mtime = st->mtime;
|
|
}
|
|
else {
|
|
time(&ctx->mtime);
|
|
}
|
|
ctx->mtime_set = true;
|
|
}
|
|
}
|