mirror of https://github.com/neutrinolabs/xrdp
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/**
|
|
* xrdp: A Remote Desktop Protocol server.
|
|
*
|
|
* Copyright (C) Koichiro Iwao 2017
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* Base64 encoder / decoder
|
|
*/
|
|
|
|
#if defined(HAVE_CONFIG_H)
|
|
#include <config_ac.h>
|
|
#endif
|
|
|
|
#include "string_calls.h"
|
|
|
|
#include <openssl/bio.h>
|
|
#include <openssl/evp.h>
|
|
|
|
size_t
|
|
base64_decoded_bytes(const char *src)
|
|
{
|
|
size_t len;
|
|
size_t padding;
|
|
|
|
len = g_strlen(src);
|
|
padding = 0;
|
|
|
|
if (src[len - 1] == '=')
|
|
{
|
|
padding++;
|
|
|
|
if (src[len - 2] == '=')
|
|
{
|
|
padding++;
|
|
}
|
|
}
|
|
|
|
return len * 3 / 4 - padding;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
char *
|
|
base64_decode(char *dst, const char *src, size_t len)
|
|
{
|
|
BIO *b64;
|
|
BIO *bio;
|
|
char *b64str;
|
|
size_t estimated_decoded_bytes;
|
|
size_t decoded_bytes;
|
|
|
|
b64str = g_strdup(src);
|
|
estimated_decoded_bytes = base64_decoded_bytes(b64str);
|
|
dst[estimated_decoded_bytes] = '\0';
|
|
|
|
b64 = BIO_new(BIO_f_base64());
|
|
bio = BIO_new_mem_buf(b64str, len);
|
|
bio = BIO_push(b64, bio);
|
|
BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
|
|
decoded_bytes = BIO_read(bio, dst, len);
|
|
BIO_free_all(bio);
|
|
|
|
/* if input is corrupt, return empty string */
|
|
if (estimated_decoded_bytes != decoded_bytes)
|
|
{
|
|
g_strncpy(dst, "", sizeof(""));
|
|
}
|
|
|
|
return dst;
|
|
}
|