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xudt_rce.c
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xudt_rce.c
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// uncomment to enable printf in CKB-VM
//#define CKB_C_STDLIB_PRINTF
//#include <stdio.h>
// it's used by blockchain-api2.h, the behavior when panic
#ifndef MOL2_EXIT
#define MOL2_EXIT ckb_exit
#endif
int ckb_exit(signed char);
#include <stdbool.h>
#include <string.h>
#include "blake2b.h"
#include "blockchain-api2.h"
#include "ckb_consts.h"
#if defined(CKB_USE_SIM)
#include <stdio.h>
#include "ckb_syscall_xudt_sim.h"
#define xudt_printf printf
#else
// it will be re-defined in ckb_dlfcn.h
#undef MAX
#undef MIN
#include "ckb_dlfcn.h"
#include "ckb_syscalls.h"
#define xudt_printf(x, ...) (void)0
#endif
#define BLAKE160_SIZE 20
#define SCRIPT_SIZE 32768
#define RAW_EXTENSION_SIZE 65536
#define EXPORTED_FUNC_NAME "validate"
#define MAX_CODE_SIZE (1024 * 1024)
#define FLAGS_SIZE 4
#define MAX_LOCK_SCRIPT_HASH_COUNT 2048
#define OWNER_MODE_INPUT_TYPE_MASK 0x80000000
#define OWNER_MODE_OUTPUT_TYPE_MASK 0x40000000
#define OWNER_MODE_INPUT_LOCK_NOT_MASK 0x20000000
#define OWNER_MODE_MASK \
(OWNER_MODE_INPUT_TYPE_MASK | OWNER_MODE_OUTPUT_TYPE_MASK | \
OWNER_MODE_INPUT_LOCK_NOT_MASK)
#include "rce.h"
// global variables, type definitions, etc
// We will leverage gcc's 128-bit integer extension here for number crunching.
typedef unsigned __int128 uint128_t;
uint8_t g_script[SCRIPT_SIZE] = {0};
uint8_t g_raw_extension_data[RAW_EXTENSION_SIZE] = {0};
WitnessArgsType g_witness_args;
/*
is_owner_mode indicates if current xUDT is unlocked via owner mode(as
described by sUDT), extension_index refers to the index of current extension in
the ScriptVec structure. args and args_length are set to the script args
included in Script structure of current extension script.
If this function returns 0, the validation for current extension script is
consider successful.
*/
typedef int (*ValidateFuncType)(int is_owner_mode, size_t extension_index,
const uint8_t* args, size_t args_len);
typedef enum XUDTFlags {
XUDTFlagsPlain = 0,
XUDTFlagsInArgs = 1,
XUDTFlagsInWitness = 2,
} XUDTFlags;
typedef enum XUDTValidateFuncCategory {
CateNormal = 0, // normal extension script
CateRce = 1, // Regulation Compliance Extension
} XUDTValidateFuncCategory;
uint8_t RCE_HASH[32] = {1};
// functions
int load_validate_func(uint8_t* code_buff, uint32_t* code_used,
const uint8_t* hash, uint8_t hash_type,
ValidateFuncType* func, XUDTValidateFuncCategory* cat) {
int err = 0;
void* handle = NULL;
size_t consumed_size = 0;
if (memcmp(RCE_HASH, hash, 32) == 0 && hash_type == 1) {
*cat = CateRce;
*func = rce_validate;
return 0;
}
CHECK2(MAX_CODE_SIZE > *code_used, ERROR_NOT_ENOUGH_BUFF);
err = ckb_dlopen2(hash, hash_type, &code_buff[*code_used],
MAX_CODE_SIZE - *code_used, &handle, &consumed_size);
CHECK(err);
CHECK2(handle != NULL, ERROR_CANT_LOAD_LIB);
ASSERT(consumed_size % RISCV_PGSIZE == 0);
*code_used += consumed_size;
*func = (ValidateFuncType)ckb_dlsym(handle, EXPORTED_FUNC_NAME);
CHECK2(*func != NULL, ERROR_CANT_FIND_SYMBOL);
*cat = CateNormal;
err = 0;
exit:
return err;
}
int verify_script_vec(uint8_t* ptr, uint32_t size, uint32_t* real_size) {
int err = 0;
CHECK2(size >= MOL_NUM_T_SIZE, ERROR_INVALID_MOL_FORMAT);
mol_num_t full_size = mol_unpack_number(ptr);
*real_size = full_size;
CHECK2(*real_size <= size, ERROR_INVALID_MOL_FORMAT);
err = 0;
exit:
return err;
}
static uint32_t read_from_witness(uintptr_t arg[], uint8_t* ptr, uint32_t len,
uint32_t offset) {
int err;
uint64_t output_len = len;
err = ckb_load_witness(ptr, &output_len, offset, arg[0], arg[1]);
if (err != 0) {
return 0;
}
if (output_len > len) {
return len;
} else {
return output_len;
}
}
uint8_t g_witness_data_source[DEFAULT_DATA_SOURCE_LENGTH];
// due to the "static" data (s_witness_data_source), the "WitnessArgsType" is a
// singleton. note: mol2_data_source_t consumes a lot of memory due to the
// "cache" field (default 2K)
int make_cursor_from_witness(WitnessArgsType* witness, bool* use_input_type) {
int err = 0;
uint64_t witness_len = 0;
// at the beginning of the transactions including RCE,
// there is no "witness" in CKB_SOURCE_GROUP_INPUT
// here we use the first witness of CKB_SOURCE_GROUP_OUTPUT
// same logic is applied to rce_validator
size_t source = CKB_SOURCE_GROUP_INPUT;
err = ckb_load_witness(NULL, &witness_len, 0, 0, source);
if (err == CKB_INDEX_OUT_OF_BOUND) {
source = CKB_SOURCE_GROUP_OUTPUT;
err = ckb_load_witness(NULL, &witness_len, 0, 0, source);
*use_input_type = false;
} else {
*use_input_type = true;
}
CHECK(err);
CHECK2(witness_len > 0, ERROR_INVALID_MOL_FORMAT);
mol2_cursor_t cur;
cur.offset = 0;
cur.size = witness_len;
mol2_data_source_t* ptr = (mol2_data_source_t*)g_witness_data_source;
ptr->read = read_from_witness;
ptr->total_size = witness_len;
// pass index and source as args
ptr->args[0] = 0;
ptr->args[1] = source;
ptr->cache_size = 0;
ptr->start_point = 0;
ptr->max_cache_size = MAX_CACHE_SIZE;
cur.data_source = ptr;
*witness = make_WitnessArgs(&cur);
err = 0;
exit:
return err;
}
int get_extension_data(uint32_t index, uint8_t* buff, uint32_t buff_len,
uint32_t* out_len) {
int err = 0;
bool use_input_type = true;
err = make_cursor_from_witness(&g_witness_args, &use_input_type);
CHECK(err);
BytesOptType input;
if (use_input_type)
input = g_witness_args.t->input_type(&g_witness_args);
else
input = g_witness_args.t->output_type(&g_witness_args);
CHECK2(!input.t->is_none(&input), ERROR_INVALID_MOL_FORMAT);
mol2_cursor_t bytes = input.t->unwrap(&input);
// convert Bytes to XudtWitnessInputType
XudtWitnessInputType witness_input = make_XudtWitnessInput(&bytes);
BytesVecType extension_data_vec =
witness_input.t->extension_data(&witness_input);
bool existing = false;
mol2_cursor_t extension_data =
extension_data_vec.t->get(&extension_data_vec, index, &existing);
CHECK2(existing, ERROR_INVALID_MOL_FORMAT);
CHECK2(buff_len >= extension_data.size, ERROR_INVALID_MOL_FORMAT);
*out_len = mol2_read_at(&extension_data, buff, buff_len);
CHECK2(*out_len == extension_data.size, ERROR_INVALID_MOL_FORMAT);
err = 0;
exit:
return err;
}
// the *var_len may be bigger than real length of raw extension data
int load_raw_extension_data(uint8_t** var_data, uint32_t* var_len) {
int err = 0;
bool use_input_type = true;
err = make_cursor_from_witness(&g_witness_args, &use_input_type);
CHECK(err);
BytesOptType input;
if (use_input_type) {
input = g_witness_args.t->input_type(&g_witness_args);
} else {
input = g_witness_args.t->output_type(&g_witness_args);
}
CHECK2(!input.t->is_none(&input), ERROR_INVALID_MOL_FORMAT);
struct mol2_cursor_t bytes = input.t->unwrap(&input);
// convert Bytes to XudtWitnessInputType
XudtWitnessInputType witness_input = make_XudtWitnessInput(&bytes);
ScriptVecOptType script_vec =
witness_input.t->raw_extension_data(&witness_input);
uint32_t read_len =
mol2_read_at(&script_vec.cur, g_raw_extension_data, RAW_EXTENSION_SIZE);
CHECK2(read_len == script_vec.cur.size, ERROR_INVALID_MOL_FORMAT);
*var_data = g_raw_extension_data;
*var_len = read_len;
err = 0;
exit:
return err;
}
int check_owner_mode(size_t source, size_t field, mol_seg_t args_bytes_seg,
int* owner_mode) {
int err = 0;
size_t i = 0;
uint8_t buffer[BLAKE2B_BLOCK_SIZE];
while (1) {
uint64_t len = BLAKE2B_BLOCK_SIZE;
err = ckb_checked_load_cell_by_field(buffer, &len, 0, i, source, field);
if (err == CKB_INDEX_OUT_OF_BOUND) {
err = 0;
break;
}
if (err == CKB_ITEM_MISSING) {
i += 1;
err = 0;
continue;
}
CHECK(err);
if (args_bytes_seg.size >= BLAKE2B_BLOCK_SIZE &&
memcmp(buffer, args_bytes_seg.ptr, BLAKE2B_BLOCK_SIZE) == 0) {
*owner_mode = 1;
break;
}
i += 1;
}
exit:
return err;
}
// *var_data will point to "Raw Extension Data", which can be in args or witness
// *var_data will refer to a memory location of g_script or g_raw_extension_data
int parse_args(int* owner_mode, XUDTFlags* flags, uint8_t** var_data,
uint32_t* var_len, uint8_t* hashes, uint32_t* hashes_count) {
int err = 0;
bool owner_mode_for_input_type = false;
bool owner_mode_for_output_type = false;
// default is on
bool owner_mode_for_input_lock = true;
uint64_t len = SCRIPT_SIZE;
int ret = ckb_checked_load_script(g_script, &len, 0);
CHECK(ret);
CHECK2(len <= SCRIPT_SIZE, ERROR_SCRIPT_TOO_LONG);
mol_seg_t script_seg;
script_seg.ptr = g_script;
script_seg.size = len;
mol_errno mol_err = MolReader_Script_verify(&script_seg, false);
CHECK2(mol_err == MOL_OK, ERROR_ENCODING);
mol_seg_t args_seg = MolReader_Script_get_args(&script_seg);
mol_seg_t args_bytes_seg = MolReader_Bytes_raw_bytes(&args_seg);
CHECK2(args_bytes_seg.size >= BLAKE2B_BLOCK_SIZE, ERROR_ARGUMENTS_LEN);
if (args_bytes_seg.size >= (FLAGS_SIZE + BLAKE2B_BLOCK_SIZE)) {
uint32_t val = *(uint32_t*)(args_bytes_seg.ptr + BLAKE2B_BLOCK_SIZE);
if (val & OWNER_MODE_INPUT_TYPE_MASK) {
owner_mode_for_input_type = true;
}
if (val & OWNER_MODE_OUTPUT_TYPE_MASK) {
owner_mode_for_output_type = true;
}
if (val & OWNER_MODE_INPUT_LOCK_NOT_MASK) {
owner_mode_for_input_lock = false;
}
}
*hashes_count = 0;
// collect hashes
size_t i = 0;
while (1) {
uint8_t buffer[BLAKE2B_BLOCK_SIZE];
uint64_t len2 = BLAKE2B_BLOCK_SIZE;
ret = ckb_checked_load_cell_by_field(buffer, &len2, 0, i, CKB_SOURCE_INPUT,
CKB_CELL_FIELD_LOCK_HASH);
if (ret == CKB_INDEX_OUT_OF_BOUND) {
break;
}
CHECK(ret);
CHECK2(*hashes_count < MAX_LOCK_SCRIPT_HASH_COUNT, ERROR_TOO_MANY_LOCK);
memcpy(&hashes[(*hashes_count) * BLAKE2B_BLOCK_SIZE], buffer,
BLAKE2B_BLOCK_SIZE);
*hashes_count += 1;
i += 1;
}
*owner_mode = 0;
if (owner_mode_for_input_lock && *owner_mode == 0) {
err = check_owner_mode(CKB_SOURCE_INPUT, CKB_CELL_FIELD_LOCK_HASH,
args_bytes_seg, owner_mode);
CHECK(err);
}
if (owner_mode_for_input_type && *owner_mode == 0) {
err = check_owner_mode(CKB_SOURCE_INPUT, CKB_CELL_FIELD_TYPE_HASH,
args_bytes_seg, owner_mode);
CHECK(err);
}
if (owner_mode_for_output_type && *owner_mode == 0) {
err = check_owner_mode(CKB_SOURCE_OUTPUT, CKB_CELL_FIELD_TYPE_HASH,
args_bytes_seg, owner_mode);
CHECK(err);
}
// parse xUDT args
if (args_bytes_seg.size < (FLAGS_SIZE + BLAKE2B_BLOCK_SIZE)) {
*var_data = NULL;
*var_len = 0;
*flags = XUDTFlagsPlain;
} else {
uint32_t temp_flags =
(*(uint32_t*)(args_bytes_seg.ptr + BLAKE2B_BLOCK_SIZE)) &
~OWNER_MODE_MASK;
if (temp_flags == XUDTFlagsPlain) {
*flags = XUDTFlagsPlain;
} else if (temp_flags == XUDTFlagsInArgs) {
uint32_t real_size = 0;
*flags = XUDTFlagsInArgs;
*var_len = args_bytes_seg.size - BLAKE2B_BLOCK_SIZE - FLAGS_SIZE;
*var_data = args_bytes_seg.ptr + BLAKE2B_BLOCK_SIZE + FLAGS_SIZE;
err = verify_script_vec(*var_data, *var_len, &real_size);
CHECK(err);
// note, it's different than "flag = 2"
CHECK2(real_size == *var_len, ERROR_INVALID_ARGS_FORMAT);
} else if (temp_flags == XUDTFlagsInWitness) {
*flags = XUDTFlagsInWitness;
uint32_t hash_size =
args_bytes_seg.size - BLAKE2B_BLOCK_SIZE - FLAGS_SIZE;
CHECK2(hash_size == BLAKE160_SIZE, ERROR_INVALID_FLAG);
err = load_raw_extension_data(var_data, var_len);
CHECK(err);
CHECK2(var_len > 0, ERROR_INVALID_MOL_FORMAT);
// verify the hash
uint8_t hash[BLAKE2B_BLOCK_SIZE] = {0};
uint8_t* blake160_hash =
args_bytes_seg.ptr + BLAKE2B_BLOCK_SIZE + FLAGS_SIZE;
err = blake2b(hash, BLAKE2B_BLOCK_SIZE, *var_data, *var_len, NULL, 0);
CHECK2(err == 0, ERROR_BLAKE2B_ERROR);
CHECK2(memcmp(blake160_hash, hash, BLAKE160_SIZE) == 0,
ERROR_HASH_MISMATCHED);
} else {
CHECK2(false, ERROR_INVALID_FLAG);
}
}
err = 0;
exit:
return err;
}
// copied from simple_udt.c
int simple_udt(int owner_mode) {
if (owner_mode) return CKB_SUCCESS;
int ret = 0;
// When the owner mode is not enabled, however, we will then need to ensure
// the sum of all input tokens is not smaller than the sum of all output
// tokens. First, let's loop through all input cells containing current UDTs,
// and gather the sum of all input tokens.
uint128_t input_amount = 0;
size_t i = 0;
uint64_t len = 0;
while (1) {
uint128_t current_amount = 0;
len = 16;
// The implementation here does not require that the transaction only
// contains UDT cells for the current UDT type. It's perfectly fine to mix
// the cells for multiple different types of UDT together in one
// transaction. But that also means we need a way to tell one UDT type from
// another UDT type. The trick is in the `CKB_SOURCE_GROUP_INPUT` value used
// here. When using it as the source part of the syscall, the syscall would
// only iterate through cells with the same script as the current running
// script. Since different UDT types will naturally have different
// script(the args part will be different), we can be sure here that this
// loop would only iterate through UDTs that are of the same type as the one
// identified by the current running script.
//
// In the case that multiple UDT types are included in the same transaction,
// this simple UDT script will be run multiple times to validate the
// transaction, each time with a different script containing different
// script args, representing different UDT types.
//
// A different trick used here, is that our current implementation assumes
// that the amount of UDT is stored as unsigned 128-bit little endian
// integer in the first 16 bytes of cell data. Since RISC-V also uses little
// endian format, we can just read the first 16 bytes of cell data into
// `current_amount`, which is just an unsigned 128-bit integer in C. The
// memory layout of a C program will ensure that the value is set correctly.
ret = ckb_checked_load_cell_data((uint8_t*)¤t_amount, &len, 0, i,
CKB_SOURCE_GROUP_INPUT);
// When `CKB_INDEX_OUT_OF_BOUND` is reached, we know we have iterated
// through all cells of current type.
if (ret == CKB_INDEX_OUT_OF_BOUND) {
break;
}
if (ret != CKB_SUCCESS) {
return ret;
}
if (len < 16) {
return ERROR_ENCODING;
}
input_amount += current_amount;
// Like any serious smart contract out there, we will need to check for
// overflows.
if (input_amount < current_amount) {
return ERROR_OVERFLOWING;
}
i += 1;
}
// With the sum of all input UDT tokens gathered, let's now iterate through
// output cells to grab the sum of all output UDT tokens.
uint128_t output_amount = 0;
i = 0;
while (1) {
uint128_t current_amount = 0;
len = 16;
// Similar to the above code piece, we are also looping through output cells
// with the same script as current running script here by using
// `CKB_SOURCE_GROUP_OUTPUT`.
ret = ckb_checked_load_cell_data((uint8_t*)¤t_amount, &len, 0, i,
CKB_SOURCE_GROUP_OUTPUT);
if (ret == CKB_INDEX_OUT_OF_BOUND) {
break;
}
if (ret != CKB_SUCCESS) {
return ret;
}
if (len < 16) {
return ERROR_ENCODING;
}
output_amount += current_amount;
// Like any serious smart contract out there, we will need to check for
// overflows.
if (output_amount < current_amount) {
return ERROR_OVERFLOWING;
}
i += 1;
}
// When both value are gathered, we can perform the final check here to
// prevent non-authorized token issurance.
if (input_amount < output_amount) {
return ERROR_AMOUNT;
}
return CKB_SUCCESS;
}
// If the extension script is identical to a lock script of one input cell in
// current transaction, we consider the extension script to be already
// validated, no additional check is needed for current extension
int is_extension_script_validated(mol_seg_t extension_script,
uint8_t* input_lock_script_hash,
uint32_t input_lock_script_hash_count) {
int err = 0;
uint8_t hash[BLAKE2B_BLOCK_SIZE];
err = blake2b(hash, BLAKE2B_BLOCK_SIZE, extension_script.ptr,
extension_script.size, NULL, 0);
CHECK2(err == 0, ERROR_BLAKE2B_ERROR);
for (uint32_t i = 0; i < input_lock_script_hash_count; i++) {
if (memcmp(&input_lock_script_hash[i * BLAKE2B_BLOCK_SIZE], hash,
BLAKE2B_BLOCK_SIZE) == 0) {
return 0;
}
}
err = ERROR_NOT_VALIDATED;
exit:
return err;
}
#ifdef CKB_USE_SIM
int simulator_main() {
#else
int main() {
#endif
// don't move code_buff into global variable. It doesn't work.
// it's a ckb-vm bug: the global variable will be freezed:
// https://github.com/nervosnetwork/ckb-vm/blob/d43f58d6bf8cc6210721fdcdb6e5ecba513ade0c/src/machine/elf_adaptor.rs#L28-L32
// The code can't be loaded into freezed memory.
uint8_t code_buff[MAX_CODE_SIZE] __attribute__((aligned(RISCV_PGSIZE)));
uint32_t code_used = 0;
int err = 0;
int owner_mode = 0;
uint8_t* raw_extension_data = NULL;
uint32_t raw_extension_len = 0;
XUDTFlags flags = XUDTFlagsPlain;
uint8_t
input_lock_script_hashes[MAX_LOCK_SCRIPT_HASH_COUNT * BLAKE2B_BLOCK_SIZE];
uint32_t input_lock_script_hash_count = 0;
err = parse_args(&owner_mode, &flags, &raw_extension_data, &raw_extension_len,
input_lock_script_hashes, &input_lock_script_hash_count);
CHECK(err);
CHECK2(owner_mode == 1 || owner_mode == 0, ERROR_INVALID_ARGS_FORMAT);
if (flags != XUDTFlagsPlain) {
CHECK2(raw_extension_data != NULL, ERROR_INVALID_ARGS_FORMAT);
CHECK2(raw_extension_len > 0, ERROR_INVALID_ARGS_FORMAT);
}
err = simple_udt(owner_mode);
if (err != 0) {
goto exit;
}
if (flags == XUDTFlagsPlain) {
err = 0;
goto exit;
}
mol_seg_t raw_extension_seg = {0};
raw_extension_seg.ptr = raw_extension_data;
raw_extension_seg.size = raw_extension_len;
CHECK2(MolReader_ScriptVec_verify(&raw_extension_seg, true) == MOL_OK,
ERROR_INVALID_ARGS_FORMAT);
uint32_t size = MolReader_ScriptVec_length(&raw_extension_seg);
for (uint32_t i = 0; i < size; i++) {
ValidateFuncType func;
mol_seg_res_t res = MolReader_ScriptVec_get(&raw_extension_seg, i);
CHECK2(res.errno == 0, ERROR_INVALID_MOL_FORMAT);
CHECK2(MolReader_Script_verify(&res.seg, false) == MOL_OK,
ERROR_INVALID_MOL_FORMAT);
mol_seg_t code_hash = MolReader_Script_get_code_hash(&res.seg);
mol_seg_t hash_type = MolReader_Script_get_hash_type(&res.seg);
mol_seg_t args = MolReader_Script_get_args(&res.seg);
uint8_t hash_type2 = *((uint8_t*)hash_type.ptr);
XUDTValidateFuncCategory cat = CateNormal;
err = load_validate_func(code_buff, &code_used, code_hash.ptr, hash_type2,
&func, &cat);
CHECK(err);
// RCE is with high priority, must be checked
if (cat != CateRce) {
int err2 = is_extension_script_validated(
res.seg, input_lock_script_hashes, input_lock_script_hash_count);
if (err2 == 0) {
continue;
}
}
mol_seg_t args_raw_bytes = MolReader_Bytes_raw_bytes(&args);
err = func(owner_mode, i, args_raw_bytes.ptr, args_raw_bytes.size);
CHECK(err);
}
err = 0;
exit:
return err;
}