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/* Starshatter: The Open Source Project
Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
Copyright (c) 1997-2006, Destroyer Studios LLC.
AUTHOR: John DiCamillo
OVERVIEW
========
This class represents a user connecting to the multiplayer lobby
*/
#include "MemDebug.h"
#include "NetAuth.h"
#include "NetLobby.h"
#include "NetUser.h"
#include "ModConfig.h"
#include "ModInfo.h"
#include "Random.h"
#include "Sha1.h"
static int auth_level = NetAuth::NET_AUTH_MINIMAL;
// +-------------------------------------------------------------------+
int
NetAuth::AuthLevel()
{
return auth_level;
}
void
NetAuth::SetAuthLevel(int n)
{
if (n >= NET_AUTH_MINIMAL && n <= NET_AUTH_SECURE)
auth_level = n;
}
// +-------------------------------------------------------------------+
Text
NetAuth::CreateAuthRequest(NetUser* u)
{
Text request;
if (u) {
u->SetAuthLevel(auth_level);
if (auth_level == NET_AUTH_MINIMAL) {
u->SetAuthState(NET_AUTH_OK);
u->SetSalt("Very Low Sodium");
}
else if (auth_level == NET_AUTH_STANDARD) {
u->SetAuthState(NET_AUTH_INITIAL);
u->SetSalt("Very Low Sodium");
request = "level 1";
}
else {
char salt[33];
for (int i = 0; i < 32; i++)
salt[i] = (char) ('0' + (int) Random(0, 9.4));
salt[32] = 0;
u->SetSalt(salt);
u->SetAuthState(NET_AUTH_INITIAL);
request = "level 2 salt ";
request += salt;
}
}
return request;
}
// +-------------------------------------------------------------------+
static Text Digest(const char* salt, const char* file)
{
int length = 0;
int offset = 0;
char block[4096];
char digest[64];
ZeroMemory(digest, sizeof(digest));
if (file) {
FILE* f;
fopen_s(&f, file, "rb");
if (f) {
SHA1 sha1;
if (salt) {
sha1.Input(salt, strlen(salt));
}
fseek(f, 0, SEEK_END);
length = ftell(f);
fseek(f, 0, SEEK_SET);
while (offset < length) {
int n = fread(block, sizeof(char), 4096, f);
sha1.Input(block, n);
offset += n;
}
fclose(f);
unsigned result[5];
if (sha1.Result(result)) {
sprintf_s(digest, "SHA1_%08X_%08X_%08X_%08X_%08X",
result[0], result[1], result[2], result[3], result[4]);
}
}
}
return digest;
}
// +-------------------------------------------------------------------+
Text
NetAuth::CreateAuthResponse(int level, const char* salt)
{
Text response;
ModConfig* config = ModConfig::GetInstance();
if (level == NET_AUTH_SECURE) {
response += "exe ";
response += Digest(salt, "stars.exe"); // XXX should look up name of this exe
response += " ";
response += "dat ";
response += Digest(salt, "shatter.dat");
response += " ";
response += "etc ";
response += Digest(salt, "start.dat");
response += " ";
}
if (level >= NET_AUTH_STANDARD) {
List<ModInfo>& mods = config->GetModInfoList();
ListIter<ModInfo> mod_iter = mods;
char buffer[32];
sprintf_s(buffer, "num %d ", mods.size());
response += buffer;
while (++mod_iter) {
ModInfo* info = mod_iter.value();
response += "mod \"";
response += info->Name();
response += "\" ver \"";
response += info->Version();
response += "\" ";
if (level == NET_AUTH_SECURE) {
response += "sha ";
response += Digest(salt, info->Filename());
response += " ";
}
}
}
return response;
}
// +-------------------------------------------------------------------+
bool
NetAuth::AuthUser(NetUser* u, Text response)
{
bool authentic = false;
if (auth_level == NET_AUTH_MINIMAL) { // (this case should not occur)
if (u) {
u->SetAuthLevel(auth_level);
u->SetAuthState(NET_AUTH_OK);
}
authentic = (u != 0);
}
else if (u) {
Text expected_response = CreateAuthResponse(auth_level, u->Salt());
if (expected_response == response)
authentic = true;
u->SetAuthState(authentic ? NET_AUTH_OK : NET_AUTH_FAILED);
}
return authentic;
}
// +-------------------------------------------------------------------+
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