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Added AES software-based implementation

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This commit is contained in:
Gregor Haas
2020-01-10 14:35:51 -05:00
parent 8c5c5a8976
commit 5326c19acc
5 changed files with 285 additions and 12 deletions
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13
c8_payloads/CMakeLists.txt
View File

@@ -11,12 +11,17 @@ endif()
set(CMAKE_C_FLAGS "-nostdlib -O")
set(PAYLOADS payload_sync payload_aes payload_sysreg payload_aes_busy)
add_executable(payload_sync src/sync.c)
set(PAYLOADS
payload_aes
payload_aes_busy
payload_aes_sw
payload_sync
payload_sysreg)
add_executable(payload_aes src/aes.c)
add_executable(payload_aes_busy src/aes_busy.c)
add_executable(payload_aes_sw src/aes_sw.c)
add_executable(payload_sync src/sync.c)
add_executable(payload_sysreg src/sysreg.c)
file(MAKE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/bin/)
@@ -26,7 +31,7 @@ foreach(BINARY ${PAYLOADS})
add_custom_command(TARGET ${BINARY} POST_BUILD
BYPRODUCTS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BINARY}.bin
COMMAND ${CMAKE_OBJCOPY}
ARGS -O binary -j .text -j .payload_text
ARGS -O binary -j .text -j .payload_text -j .payload_data
${CMAKE_CURRENT_BINARY_DIR}/${BINARY}
${CMAKE_CURRENT_SOURCE_DIR}/bin/${BINARY}.bin)
endforeach(BINARY)

150
c8_payloads/src/aes_sw.c Normal file
View File

@@ -0,0 +1,150 @@
#include "util.h"
PAYLOAD_SECTION
void sub_bytes(unsigned char block[16], unsigned char sbox[16][16])
{
int i;
unsigned char val;
for(i = 0; i < 16; i++)
{
val = block[i];
block[i] = sbox[val >> 4u][val & 0xfu];
}
}
PAYLOAD_SECTION
void shift_rows(unsigned char block[16])
{
unsigned char temp1, temp2;
temp1 = block[0x1];
block[0x1] = block[0x5];
block[0x5] = block[0x9];
block[0x9] = block[0xd];
block[0xd] = temp1;
temp1 = block[0x2];
temp2 = block[0xe];
block[0x2] = block[0xa];
block[0xe] = block[0x6];
block[0xa] = temp1;
block[0x6] = temp2;
temp1 = block[0x3];
block[0x3] = block[0xf];
block[0xf] = block[0xb];
block[0xb] = block[0x7];
block[0x7] = temp1;
}
PAYLOAD_SECTION
void mix_cols(unsigned char block[16],
unsigned char mul2_lookup[256], unsigned char mul3_lookup[256])
{
unsigned char r0, r1, r2, r3;
int i;
for(i = 0; i < 4; i++)
{
r0 = block[4 * i];
r1 = block[4 * i + 1];
r2 = block[4 * i + 2];
r3 = block[4 * i + 3];
// no reason for the "+ 0" here but it makes the code look more lined up :)
block[4 * i + 0] = mul2_lookup[r0] ^ mul3_lookup[r1] ^ r2 ^ r3;
block[4 * i + 1] = r0 ^ mul2_lookup[r1] ^ mul3_lookup[r2] ^ r3;
block[4 * i + 2] = r0 ^ r1 ^ mul2_lookup[r2] ^ mul3_lookup[r3];
block[4 * i + 3] = mul3_lookup[r0] ^ r1 ^ r2 ^ mul2_lookup[r3];
}
}
PAYLOAD_SECTION
void add_key(unsigned char block[16], unsigned char key[16])
{
int i;
for(i = 0; i < 16; i++)
{
block[i] = block[i] ^ key[i];
}
}
PAYLOAD_SECTION
void expand_key(unsigned char key[16], unsigned char key_sched[176], int n,
unsigned char sbox[16][16], unsigned char rc_lookup[11])
{
int i, j, prev_key_base, key_base = 0;
unsigned char val;
for(i = 0; i < 16; i++)
{
key_sched[i] = key[i];
}
for(i = 1; i < n; i++)
{
prev_key_base = key_base;
key_base = 16 * i;
for(j = 0; j < 3; j++)
{
val = key_sched[prev_key_base + 13 + j];
key_sched[key_base + j] = sbox[val >> 4u][val & 0xfu];
}
val = key_sched[prev_key_base + 12];
key_sched[key_base + 3] = sbox[val >> 4u][val & 0xfu];
key_sched[key_base] ^= rc_lookup[i - 1];
for(j = 0; j < 4; j++)
{
key_sched[key_base + j] = key_sched[key_base + j] ^ key_sched[prev_key_base + j];
}
for(j = 4; j < 16; j++)
{
key_sched[key_base + j] = key_sched[key_base + j - 4] ^ key_sched[prev_key_base + j];
}
}
}
PAYLOAD_SECTION
void aes128_encrypt_ecb(unsigned char *msg, unsigned int msg_len, unsigned char key[16],
unsigned char sbox[16][16], unsigned char rc_lookup[11],
unsigned char mul2[256], unsigned char mul3[256])
{
unsigned char key_sched[176];
expand_key(key, key_sched, 11, sbox, rc_lookup);
unsigned int num_blocks = msg_len / 16;
unsigned char *block;
unsigned int i, j;
for(i = 0; i < num_blocks; i++)
{
block = &msg[16 * i];
add_key(block, key_sched);
for(j = 0; j < 9; j++)
{
sub_bytes(block, sbox);
shift_rows(block);
mix_cols(block, mul2, mul3);
add_key(block, &key_sched[16 * (j + 1)]);
}
sub_bytes(block, sbox);
shift_rows(block);
add_key(block, &key_sched[16 * (j + 1)]);
}
}
TEXT_SECTION
unsigned int _start(unsigned char *msg, unsigned int msg_len, unsigned char *key,
unsigned char sbox[16][16], unsigned char rc_lookup[11],
unsigned char mul2[256], unsigned char mul3[256])
{
aes128_encrypt_ecb(msg, msg_len, key, sbox, rc_lookup, mul2, mul3);
return 0xDEADBEEF;
}

2
c8_remote/include/payload.h
View File

@@ -5,6 +5,7 @@
#define PAYLOAD_AES_BIN CHECKM8_BIN_BASE "payloads/payload_aes.bin"
#define PAYLOAD_AES_BUSY_BIN CHECKM8_BIN_BASE "payloads/payload_aes_busy.bin"
#define PAYLOAD_AES_SW_BIN CHECKM8_BIN_BASE "payloads/payload_aes_sw.bin"
#define PAYLOAD_SYNC_BIN CHECKM8_BIN_BASE "payloads/payload_sync.bin"
#define PAYLOAD_SYSREG_BIN CHECKM8_BIN_BASE "payloads/payload_sysreg.bin"
@@ -12,6 +13,7 @@ typedef enum
{
PAYLOAD_AES,
PAYLOAD_AES_BUSY,
PAYLOAD_AES_SW,
PAYLOAD_SYNC,
PAYLOAD_SYSREG,
} PAYLOAD_T;

128
c8_remote/main.c
View File

@@ -43,9 +43,106 @@ void checkm8_debug_block(const char *format, ...)
#endif
}
void write_aes_utils(struct pwned_device *dev)
{
unsigned char sbox[256] =
{
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};
unsigned char rc_lookup[11] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c};
unsigned char mul2_lookup[256] =
{
0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e,
0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e,
0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e,
0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e,
0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e,
0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe,
0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde,
0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe,
0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05,
0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25,
0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45,
0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65,
0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85,
0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5,
0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5,
0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5
};
unsigned char mul3_lookup[256] =
{
0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, 0x12, 0x11,
0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21,
0x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71,
0x50, 0x53, 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41,
0xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1,
0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1,
0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1,
0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81,
0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a,
0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, 0xb9, 0xba,
0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea,
0xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda,
0x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a,
0x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a,
0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a,
0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x13, 0x10, 0x15, 0x16, 0x1f, 0x1c, 0x19, 0x1a
};
struct dev_cmd_resp *resp;
resp = write_gadget(dev, 0x180154000, sbox, 256);
if(IS_CHECKM8_FAIL(resp->ret))
{
printf("failed to write sbox\n");
return;
}
free_dev_cmd_resp(resp);
resp = write_gadget(dev, 0x180154000 + 256, rc_lookup, 11);
if(IS_CHECKM8_FAIL(resp->ret))
{
printf("failed to write rc lookup\n");
return;
}
free_dev_cmd_resp(resp);
resp = write_gadget(dev, 0x180154000 + 256 + 16, mul2_lookup, 256);
if(IS_CHECKM8_FAIL(resp->ret))
{
printf("failed to write mul2 lookup\n");
return;
}
free_dev_cmd_resp(resp);
resp = write_gadget(dev, 0x180154000 + 512 + 16, mul3_lookup, 256);
if(IS_CHECKM8_FAIL(resp->ret))
{
printf("failed to write mul3 lookup\n");
return;
}
}
int main()
{
int ret;
struct dev_cmd_resp *resp;
struct pwned_device *dev = exploit_device();
if(dev == NULL || dev->status == DEV_NORMAL)
@@ -54,10 +151,12 @@ int main()
return -1;
}
unsigned char key[8] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef};
unsigned char key[16] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd,
0xef};
unsigned char data[16] = {0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe,
0xef};
if(IS_CHECKM8_FAIL(open_device_session(dev)))
{
printf("failed to open device session\n");
@@ -70,19 +169,20 @@ int main()
return -1;
}
if(IS_CHECKM8_FAIL(install_payload(dev, PAYLOAD_AES_BUSY, SRAM)))
if(IS_CHECKM8_FAIL(install_payload(dev, PAYLOAD_AES_SW, SRAM)))
{
printf("failed to install aes busy payload\n");
return -1;
}
resp = write_gadget(dev, 0x180152000, key, 8);
resp = write_gadget(dev, 0x180152000, key, 16);
if(IS_CHECKM8_FAIL(resp->ret))
{
printf("failed to write key to device\n");
return -1;
}
free_dev_cmd_resp(resp);
resp = write_gadget(dev, 0x180153000, data, 16);
if(IS_CHECKM8_FAIL(resp->ret))
{
@@ -90,6 +190,7 @@ int main()
return -1;
}
free_dev_cmd_resp(resp);
resp = execute_payload(dev, PAYLOAD_SYNC, 0, 0);
if(IS_CHECKM8_FAIL(resp->ret))
@@ -98,16 +199,28 @@ int main()
return -1;
}
write_aes_utils(dev);
free_dev_cmd_resp(resp);
for(int i = 0; i < 100000; i++)
for(int i = 0; i < 32; i++)
{
resp = execute_payload(dev, PAYLOAD_AES_BUSY, 16, 4, 0x180153000, 0x1800b0010, 0x180150000, 8);
resp = execute_payload(dev, PAYLOAD_AES_SW, 0, 7,
0x180153000, 16, 0x180152000,
0x180154000, 0x180154000 + 256,
0x180154000 + 256 + 16, 0x180154000 + 512 + 16);
if(IS_CHECKM8_FAIL(resp->ret))
{
printf("failed to execute busy AES payload\n");
printf("failed to execute sw AES payload\n");
return -1;
}
free_dev_cmd_resp(resp);
resp = read_gadget(dev, 0x180153000, 16);
if(IS_CHECKM8_FAIL(resp->ret))
{
printf("failed to read encrypted data from memory\n");
}
memcpy(data, resp->data, 16);
free_dev_cmd_resp(resp);
@@ -117,7 +230,6 @@ int main()
printf("%02x", data[j]);
}
printf("\n");
usleep(3000000);
}
close_device_session(dev);

4
c8_remote/src/payload.c
View File

@@ -35,6 +35,10 @@ struct payload *get_payload(PAYLOAD_T p)
path = PAYLOAD_AES_BUSY_BIN;
break;
case PAYLOAD_AES_SW:
path = PAYLOAD_AES_SW_BIN;
break;
case PAYLOAD_SYNC:
path = PAYLOAD_SYNC_BIN;
break;