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Refactor Base64 functions, encode/decode using OpenSSL's EVP interface

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Our own implementation works fine, however we should use OpenSSL's one since we already link to the library.

Base64Decode() and Base64Encode() return the required buffer size when "dst" is NULL.

This allows to efficiently allocate a buffer, without wasting memory or risking an overflow.

Base64FromBin() and Base64ToBin() perform all steps, returning a heap-allocated buffer with the data in it.
This commit is contained in:
Davide Beatrici
2021-07-02 09:24:41 +02:00
parent 03d67fd5b1
commit 233e28f38c
14 changed files with 224 additions and 369 deletions
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69
src/Cedar/Wpc.c
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@ -11,6 +11,7 @@
#include "Protocol.h"
#include "Mayaqua/DNS.h"
#include "Mayaqua/Encoding.h"
#include "Mayaqua/Memory.h"
#include "Mayaqua/Microsoft.h"
#include "Mayaqua/Pack.h"
@ -807,19 +808,14 @@ BUF *HttpRequestEx3(URL_DATA *data, INTERNET_SETTING *setting,
if (IsEmptyStr(setting->ProxyUsername) == false || IsEmptyStr(setting->ProxyPassword) == false)
{
char auth_tmp_str[MAX_SIZE], auth_b64_str[MAX_SIZE * 2];
char basic_str[MAX_SIZE * 2];
char auth_str[MAX_SIZE * 2];
Format(auth_str, sizeof(auth_str), "%s:%s", setting->ProxyUsername, setting->ProxyPassword);
// Generate the authentication string
Format(auth_tmp_str, sizeof(auth_tmp_str), "%s:%s",
setting->ProxyUsername, setting->ProxyPassword);
char *base64 = Base64FromBin(NULL, auth_str, StrLen(auth_str));
Format(auth_str, sizeof(auth_str), "Basic %s", base64);
Free(base64);
// Base64 encode
Zero(auth_b64_str, sizeof(auth_b64_str));
Encode64(auth_b64_str, auth_tmp_str);
Format(basic_str, sizeof(basic_str), "Basic %s", auth_b64_str);
AddHttpValue(h, NewHttpValue("Proxy-Authorization", basic_str));
AddHttpValue(h, NewHttpValue("Proxy-Authorization", auth_str));
}
}
@ -1229,18 +1225,14 @@ bool ParseUrl(URL_DATA *data, char *str, bool is_post, char *referrer)
}
// String replacement
void Base64ToSafe64(char *str)
void Base64ToSafe64(char *str, const UINT size)
{
UINT i, len;
// Validate arguments
if (str == NULL)
if (str == NULL || size == 0)
{
return;
}
len = StrLen(str);
for (i = 0;i < len;i++)
for (UINT i = 0; i < size; ++i)
{
switch (str[i])
{
@ -1258,18 +1250,14 @@ void Base64ToSafe64(char *str)
}
}
}
void Safe64ToBase64(char *str)
void Safe64ToBase64(char *str, const UINT size)
{
UINT i, len;
// Validate arguments
if (str == NULL)
if (str == NULL || size == 0)
{
return;
}
len = StrLen(str);
for (i = 0;i < len;i++)
for (UINT i = 0; i < size; ++i)
{
switch (str[i])
{
@ -1288,44 +1276,39 @@ void Safe64ToBase64(char *str)
}
}
// Decode from Safe64
UINT DecodeSafe64(void *dst, char *src, UINT src_strlen)
// Decode from escaped Base64
UINT DecodeSafe64(void *dst, const char *src, UINT size)
{
char *tmp;
UINT ret;
if (dst == NULL || src == NULL)
{
return 0;
}
if (src_strlen == 0)
if (size == 0)
{
src_strlen = StrLen(src);
size = StrLen(src);
}
tmp = Malloc(src_strlen + 1);
Copy(tmp, src, src_strlen);
tmp[src_strlen] = 0;
Safe64ToBase64(tmp);
char *tmp = Malloc(size + 1);
Copy(tmp, src, size);
tmp[size] = '\0';
ret = B64_Decode(dst, tmp, src_strlen);
Safe64ToBase64(tmp, size);
const UINT ret = Base64Decode(dst, tmp, size);
Free(tmp);
return ret;
}
// Encode to Safe64
void EncodeSafe64(char *dst, void *src, UINT src_size)
// Encode to escaped Base64
void EncodeSafe64(char *dst, const void *src, const UINT size)
{
UINT size;
if (dst == NULL || src == NULL)
{
return;
}
size = B64_Encode(dst, src, src_size);
dst[size] = 0;
const UINT ret = Base64Encode(dst, src, size);
Base64ToSafe64(dst);
Base64ToSafe64(dst, ret);
}