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fairfree.js
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const cm = new CModule(`
#include <stdio.h>
unsigned int calcDecryptDataLen(unsigned long X0)
{
unsigned int v0 = (X0 ^ 0x2CFCF86E);
unsigned int v1 = 1514590667 * v0;
unsigned int v12 = *(unsigned int *)(X0+0x28) + v1;
unsigned int v770 = v12 - 0x44A75F25;
unsigned int v24 = (v770 - ((2 * v770 + 274998170) & 0x66F8C006) - 0x44518E30) ^ 0xB37C6003;
return v24;
}
unsigned int calcEncryptDataLen(unsigned long a1)
{
unsigned int v2 = 2101767179 * (a1 ^ 0x4A16AFDC);
unsigned long v5 = (unsigned int)(*(unsigned int *)(a1 + 0x28) - v2);
unsigned long v7 = v5 - 1275503213 - ((2 * (v5 - 1275503213) - 441333462) & 0xB165B874) + 1267450063;
unsigned int v13 = (v7 ^ 0xE74FB145) + (2 * v7 & 0x7FFADAFE ^ 0x31609874) + 2065611771;
unsigned int size = v13 - 0x3B1C297A;
return size;
}
typedef unsigned long uint64_t;
typedef unsigned int uint32_t;
typedef unsigned int bool;
void signEncryptArg(uint64_t pArg, int datalen)
{
// int datalen = 0xD0;
// uint64_t pArg = 0x16FA31798;
uint64_t X13 = pArg;
uint32_t W23 = 0x6B9A323B + datalen;
uint32_t W13 = (X13 ^ 0x4A16AFDC) * 0x7D466C0B;
uint32_t W11 = W13 + W23 + 0xED938B9D;
printf("\n%p %X %X\n", X13, W13, W11); //DF239AEE 38515994
*(uint32_t*)(pArg + 0x28) = W11;
{
bool flag=1; //10025DF3C CMP W8, W9
uint32_t __W13 = 5; //10025DF40 LDR W13, [SP,#0x137C]
uint32_t W9 = !flag;
uint32_t W10 = flag;
//uint32_t
W9 = W9*0x6195 + __W13;
uint32_t W22 = W10*0x6198 + W9;
uint32_t W12 = W22 + 0xFFFF9E65;
//uint32_t
W9 = W12 ^ W13;
printf("\n\n%X %X %X\n\n", W22, W12, W9);
*(uint32_t*)(pArg + 0x2C) = W9;
}
}
`);
// console.log(JSON.stringify(cm));
const calcDecryptDataLen = new NativeFunction(cm.calcDecryptDataLen, 'int', ["pointer"]);
const calcEncryptDataLen = new NativeFunction(cm.calcEncryptDataLen, 'int', ["pointer"]);
const signEncryptArg = new NativeFunction(cm.signEncryptArg, 'void', ["pointer","int"]);
var base_addr = Module.findBaseAddress("fairplayd.H2");
send("base_addr addr:" + base_addr);
global.lastsinf = "";
Interceptor.attach(base_addr.add(0x021F3E4), {
onEnter: function(args) {
let key = args[0].add(0x10).readPointer();
let iv = args[0].add(0x30).readPointer();
let priv = args[0].add(0x20).readPointer();
let outbuf = args[0].add(0x8).readPointer();
let len_enc = args[0].add(0x28).readUInt();
let datalen = calcDecryptDataLen(args[0]);
console.log("\ndecode***********", args[0], "len="+datalen.toString(16), "in="+priv, "out="+outbuf);
send("\ncallstack:\n" + Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join('\n'));
send("return address: " + this.returnAddress.sub(base_addr));
console.log("\n----key:\n", hexdump(key,{offset: 0,length: 16,header:false,ansi:false}),
"\n----iv:\n", hexdump(iv,{offset: 0,length: 16,header:false,ansi:false}),
"\n----data:\n", hexdump(priv,{offset: 0,length: datalen})
);
this.datalen = datalen;
this.outbuf = outbuf;
this.key = key;
this.iv = iv;
//if(datalen==0x1B0) {
// for(let i=0; i<16; i++) key.add(i).writeU8(0);
// for(let i=0; i<16; i++) iv.add(i).writeU8(0);
// for(let i=0; i<0x1B0; i++) priv.add(i).writeU8(0);
//}
},
onLeave: function(retval){
//retval.replace(0);
for(let i=0; i<this.datalen; i++)
{
let p = this.outbuf.add(i);
p.writeU8(p.readU8() ^ 0x45);
}
console.log("\n----decrypted:\n",
hexdump(this.outbuf, {offset: 0, length: this.datalen})
);
var savefile = "/tmp/"+this.outbuf+"."+this.datalen;
var file = new File(savefile, "wb");
file.write(this.outbuf.readByteArray(this.datalen));
file.flush()
file.close();
for(let i=0; i<this.datalen; i++)
{
let p = this.outbuf.add(i);
p.writeU8(p.readU8() ^ 0x45);
}
if(this.datalen==0x1B0)
{
console.log("lastsinf="+global.lastsinf);
let datalen=this.datalen;
let inbuf = Memory.dup(this.outbuf, datalen);
inbuf.add(0xA6).writeU8(0 ^ 0x45); //mode=0
let outbuf = Memory.alloc(datalen);
let arg = Memory.alloc(0x30);
arg.add(0x00).writePointer(this.key);
arg.add(0x10).writePointer(this.iv);
arg.add(0x18).writePointer(outbuf);
arg.add(0x20).writePointer(inbuf);
signEncryptArg(arg, datalen);
const funcEncrypt = new NativeFunction(base_addr.add(0x7790F8), 'void', ["pointer"]);
funcEncrypt(arg);
console.log("ret="+arg.add(8).readUInt().toString(16), "datalen="+datalen.toString(16), "\n", hexdump(outbuf,{offset: 0,length: datalen}) );
let fopen = new NativeFunction(Module.findExportByName(null,"fopen"), 'pointer', ["pointer", "pointer"]);
let fwrite = new NativeFunction(Module.findExportByName(null,"fwrite"), 'int', ["pointer", "int", "int", "pointer"]);
let fclose = new NativeFunction(Module.findExportByName(null,"fclose"), 'void', ["pointer"]);
let fseek = new NativeFunction(Module.findExportByName(null,"fseek"), 'void', ["pointer", "int", "int"]);
const SEEK_SET=0;
let fp = fopen(Memory.allocUtf8String(global.lastsinf), Memory.allocUtf8String("rb+"));
console.log("fp=", fp);
fseek(fp, 0xC6, SEEK_SET);
let mode = Memory.alloc(1); mode.writeU8(0);
fwrite(mode, 1, 1, fp);
fseek(fp, 0x1E0, SEEK_SET); //priv
fwrite(outbuf, datalen, 1, fp);
fclose(fp);
}
}
});
let data = [
0x69, 0x74, 0x75, 0x6e, 0x00, 0x00, 0x00, 0x0c, 0x76, 0x65, 0x72, 0x73, 0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x18, 0x6b, 0x65, 0x79, 0x20, 0x17, 0x5b, 0xc7, 0x3d, 0x91, 0xaf, 0x0e, 0x52,
0x64, 0xe1, 0xa7, 0xea, 0x64, 0x28, 0x7c, 0x07, 0x00, 0x00, 0x00, 0x18, 0x69, 0x76, 0x69, 0x76,
0x4e, 0xac, 0xfd, 0xaa, 0xb1, 0x87, 0xf6, 0x84, 0x0f, 0x37, 0x25, 0x8e, 0xc7, 0x42, 0xab, 0xfc,
0x00, 0x00, 0x00, 0x18, 0x74, 0x6d, 0x70, 0x72, 0xb3, 0xc6, 0xb9, 0xf9, 0x73, 0x06, 0x9b, 0xbf,
0xdb, 0xf6, 0x67, 0x84, 0x5a, 0x50, 0x86, 0x8e, 0x00, 0x00, 0x00, 0x58, 0x72, 0x69, 0x67, 0x68,
0x76, 0x65, 0x49, 0x44, 0x00, 0x21, 0x4d, 0xae, 0x70, 0x6c, 0x61, 0x74, 0x00, 0x00, 0x00, 0x02,
0x61, 0x76, 0x65, 0x72, 0x01, 0x01, 0x01, 0x00, 0x74, 0x72, 0x61, 0x6e, 0xdf, 0x4a, 0x6c, 0x1f,
0x73, 0x69, 0x6e, 0x67, 0x00, 0x00, 0x00, 0x00, 0x73, 0x6f, 0x6e, 0x67, 0x27, 0xd8, 0x83, 0x43,
0x74, 0x6f, 0x6f, 0x6c, 0x50, 0x36, 0x30, 0x35, 0x6d, 0x65, 0x64, 0x69, 0x00, 0x00, 0x00, 0x80,
0x6d, 0x6f, 0x64, 0x65, 0x00, 0x00, 0x20, 0x00, 0x68, 0x69, 0x33, 0x32, 0x00, 0x00, 0x00, 0x04,
0x00, 0x00, 0x01, 0x08, 0x6e, 0x61, 0x6d, 0x65, 0xe7, 0x9b, 0x9b, 0x20, 0xe5, 0xbc, 0xa0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
];
//let data = [0x69,0x74,0x75,0x6e,0x00,0x00,0x00,0x0c,0x76,0x65,0x72,0x73,0x00,0x00,0x00,0x01];
let datalen=data.length;
let iv = Memory.alloc(0x10);
let key = Memory.alloc(0x10);
let inbuf = Memory.alloc(datalen);
let outbuf = Memory.alloc(datalen);
for(let i=0; i<16; i++) key.add(i).writeU8([0xD7,0x8D,0x1A,0xB7,0x9B,0xD1,0x50,0xD2,0x45,0x60,0xE2,0x33,0xA8,0x71,0xBB,0xA2][i]);
for(let i=0; i<16; i++) iv.add(i).writeU8([0x04,0xAA,0x10,0xE4,0x13,0xE9,0x94,0x2E,0xC0,0x7D,0x28,0x5C,0xBE,0xCD,0xA4,0x15][i]);
for(let i=0; i<datalen; i++) inbuf.add(i).writeU8(data[i] ^ 0x45);
let arg = Memory.alloc(0x30);
arg.add(0x00).writePointer(key);
arg.add(0x10).writePointer(iv);
arg.add(0x18).writePointer(outbuf);
arg.add(0x20).writePointer(inbuf);
signEncryptArg(arg, datalen);
const funcEncrypt = new NativeFunction(base_addr.add(0x7790F8), 'void', ["pointer"]);
funcEncrypt(arg);
console.log("ret="+arg.add(8).readUInt().toString(16), "datalen="+datalen.toString(16), "\n", hexdump(outbuf,{offset: 0,length: datalen}) );
if(0)
Interceptor.attach(base_addr.add(0x7790F8), {
onEnter: function(args) {
let key = args[0].add(0).readPointer();
let iv = args[0].add(0x10).readPointer();
let outbuf = args[0].add(0x18).readPointer();
let inbuf = args[0].add(0x20).readPointer();
//signEncryptArg(args[0], 16);
let datalen = calcEncryptDataLen(args[0]);
console.log("\x07*********** encode ***********", args[0], "len="+datalen.toString(16), "in="+inbuf, "out="+outbuf);
//send("\ncallstack:\n" + Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join('\n'));
send("return address: " + this.returnAddress.sub(base_addr));
//!auto dealloc by frida!
//Memory.protect(iv, 16, "rw-");
iv=this.iv=Memory.dup(iv, 16); args[0].add(0x10).writePointer(this.iv);
key=this.key=Memory.dup(key, 16); args[0].add(0).writePointer(this.key);
//inbuf=this.inbuf=Memory.dup(inbuf, datalen); args[0].add(0x20).writePointer(this.inbuf);
//make sure inbuf < outbuf
this.newbuf = Memory.alloc(datalen*2);
Memory.copy(this.newbuf, inbuf, datalen);
inbuf = this.newbuf; args[0].add(0x20).writePointer(inbuf);
outbuf = this.newbuf.add(datalen); args[0].add(0x18).writePointer(outbuf);
// for(let i=0; i<16; i++) key.add(i).writeU8(0);
// for(let i=0; i<16; i++) iv.add(i).writeU8(0);
// for(let i=0; i<16; i++) inbuf.add(i).writeU8([0x02,0x01,0x3A,0xB2,0xFC,0x21,0x68,0xCD,0x43,0x7D,0x27,0xB0,0x10,0x42,0x9B,0xD4][i]);
for(let i=0; i<16; i++) key.add(i).writeU8([0xD7,0x8D,0x1A,0xB7,0x9B,0xD1,0x50,0xD2,0x45,0x60,0xE2,0x33,0xA8,0x71,0xBB,0xA2][i]);
for(let i=0; i<16; i++) iv.add(i).writeU8([0x04,0xAA,0x10,0xE4,0x13,0xE9,0x94,0x2E,0xC0,0x7D,0x28,0x5C,0xBE,0xCD,0xA4,0x15][i]);
for(let i=0; i<16; i++) inbuf.add(i).writeU8([0x69,0x74,0x75,0x6e,0x00,0x00,0x00,0x0c,0x76,0x65,0x72,0x73,0x00,0x00,0x00,0x01][i] ^ 0x45);
//args[0].add(0x28).writeInt(datalen + 0x3B1C297A);
console.log("\n----key:\n", hexdump(key,{offset: 0,length: 16,header:false,ansi:false}),
"\n----iv:\n", hexdump(iv,{offset: 0,length: 16,header:false,ansi:false}),
"\n----data:\n", hexdump(inbuf,{offset: 0,length: datalen})
);
this.datalen = datalen;
this.outbuf = outbuf;
},
onLeave: function(retval){
//retval.replace(0);
console.log("\n-------------encrypted:\n",
hexdump(this.outbuf, {offset: 0, length: this.datalen})
);
}
});
global.fds = [];
Interceptor.attach(Module.findExportByName("libSystem.B.dylib","open"), {
onEnter: function(args) {
//send("hookfunc: "+args[0] + " " +args[1] + " " +args[2] + " " +args[3] + " " +args[4] + " " +args[5] + " " +args[6] + " " +args[7] + " ");
send("\n******** open "+args[1]+"\t"+args[0].readCString());
this.fname = args[0].readCString();
send("callstack:\n" + Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join('\n'));
send("return address: " + this.returnAddress.sub(base_addr));
if(/\.sinf$/.test(this.fname)) global.lastsinf = this.fname;
},
onLeave: function(retval){
send("func return: "+retval+"\n");
global.fds[retval] = this.fname;
//send(hexdump(retval, {offset: 0,length: 64,header: true,ansi: true}));
//retval.replace(0);
}
});
Interceptor.attach(Module.findExportByName("libSystem.B.dylib","open_dprotected_np"), {
onEnter: function(args) {
//send("hookfunc: "+args[0] + " " +args[1] + " " +args[2] + " " +args[3] + " " +args[4] + " " +args[5] + " " +args[6] + " " +args[7] + " ");
send("\n******** open_dprotected_np "+args[1]+"\t"+args[0].readCString());
this.fname = args[0].readCString();
send("callstack:\n" + Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join('\n'));
send("return address: " + this.returnAddress.sub(base_addr));
},
onLeave: function(retval){
send("func return: "+retval+"\n");
global.fds[retval] = this.fname;
//send(hexdump(retval, {offset: 0,length: 64,header: true,ansi: true}));
//retval.replace(0);
}
});
const lseek = new NativeFunction(Module.findExportByName("libSystem.B.dylib","lseek"), 'int', ["int", "int", "int"]);
Interceptor.attach(Module.findExportByName("libSystem.B.dylib","write"), {
onEnter: function(args) {
const SEEK_CUR=1;
let off = lseek(Number(args[0]), 0, SEEK_CUR);
console.log("\x07\n******** write "+args[0], args[1], args[2], "off="+off, "name="+global.fds[args[0]], "\n");
send("callstack:\n" + Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join('\n'));
send("return address: " + this.returnAddress.sub(base_addr));
console.log("\n", args[1].readByteArray(Number(args[2])));
// if(Number(args[2])==0xE4) {
// args[1].writeInt(0);
// }
}
});
// Interceptor.attach(Module.findExportByName("fairplayd.H2", "malloc"), {
// onEnter: function(args) {
// //send("hookfunc: "+args[0] + " " +args[1] + " " +args[2] + " " +args[3] + " " +args[4] + " " +args[5] + " " +args[6] + " " +args[7] + " ");
// console.log("malloc", args[0], Number(args[0]));
// this.allocsize = Number(args[0]);
// send("callstack:\n" + Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join('\n'));
// send("return address: " + this.returnAddress.sub(base_addr));
// },
// onLeave: function(retval) {
// for(let i=0; i<this.allocsize; i++) retval.add(i).writeU8(0);
// send("buffer= "+retval+" ~" + retval.add(this.allocsize) + "\n\n");
// //global.malloc[retval] = this.allocsize;
// //send(hexdump(retval, {offset: 0,length: 64,header: true,ansi: true}));
// //retval.replace(0);
// }
// });