642 lines
23 KiB
Rust
642 lines
23 KiB
Rust
//! budget program
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use bincode::{self, deserialize, serialize_into, serialized_size};
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use budget_expr::BudgetExpr;
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use budget_instruction::Instruction;
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use chrono::prelude::{DateTime, Utc};
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use payment_plan::Witness;
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use solana_sdk::account::Account;
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use solana_sdk::pubkey::Pubkey;
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use std::io;
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use transaction::Transaction;
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#[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
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pub enum BudgetError {
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InsufficientFunds,
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ContractAlreadyExists,
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ContractNotPending,
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SourceIsPendingContract,
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UninitializedContract,
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NegativeTokens,
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DestinationMissing,
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FailedWitness,
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UserdataTooSmall,
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UserdataDeserializeFailure,
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UnsignedKey,
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}
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#[derive(Serialize, Deserialize, Debug, Clone, Default, PartialEq)]
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pub struct BudgetState {
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pub initialized: bool,
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pub pending_budget: Option<BudgetExpr>,
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}
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const BUDGET_PROGRAM_ID: [u8; 32] = [
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129, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0,
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];
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impl BudgetState {
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fn is_pending(&self) -> bool {
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self.pending_budget != None
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}
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pub fn id() -> Pubkey {
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Pubkey::new(&BUDGET_PROGRAM_ID)
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}
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pub fn check_id(program_id: &Pubkey) -> bool {
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program_id.as_ref() == BUDGET_PROGRAM_ID
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}
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/// Process a Witness Signature. Any payment plans waiting on this signature
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/// will progress one step.
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fn apply_signature(
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&mut self,
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tx: &Transaction,
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instruction_index: usize,
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accounts: &mut [&mut Account],
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) -> Result<(), BudgetError> {
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let mut final_payment = None;
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if let Some(ref mut expr) = self.pending_budget {
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let key = match tx.signed_key(instruction_index, 0) {
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None => return Err(BudgetError::UnsignedKey),
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Some(key) => key,
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};
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expr.apply_witness(&Witness::Signature, key);
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final_payment = expr.final_payment();
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}
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if let Some(payment) = final_payment {
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if Some(&payment.to) != tx.key(instruction_index, 2) {
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trace!("destination missing");
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return Err(BudgetError::DestinationMissing);
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}
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self.pending_budget = None;
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accounts[1].tokens -= payment.tokens;
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accounts[2].tokens += payment.tokens;
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}
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Ok(())
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}
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/// Process a Witness Timestamp. Any payment plans waiting on this timestamp
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/// will progress one step.
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fn apply_timestamp(
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&mut self,
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tx: &Transaction,
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instruction_index: usize,
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accounts: &mut [&mut Account],
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dt: DateTime<Utc>,
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) -> Result<(), BudgetError> {
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// Check to see if any timelocked transactions can be completed.
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let mut final_payment = None;
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if let Some(ref mut expr) = self.pending_budget {
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let key = match tx.signed_key(instruction_index, 0) {
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None => return Err(BudgetError::UnsignedKey),
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Some(key) => key,
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};
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expr.apply_witness(&Witness::Timestamp(dt), key);
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final_payment = expr.final_payment();
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}
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if let Some(payment) = final_payment {
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if Some(&payment.to) != tx.key(instruction_index, 2) {
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trace!("destination missing");
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return Err(BudgetError::DestinationMissing);
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}
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self.pending_budget = None;
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accounts[1].tokens -= payment.tokens;
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accounts[2].tokens += payment.tokens;
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}
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Ok(())
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}
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fn apply_debits_to_budget_state(
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tx: &Transaction,
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instruction_index: usize,
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accounts: &mut [&mut Account],
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instruction: &Instruction,
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) -> Result<(), BudgetError> {
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if !accounts[0].userdata.is_empty() {
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trace!("source is pending");
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return Err(BudgetError::SourceIsPendingContract);
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}
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match instruction {
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Instruction::NewBudget(expr) => {
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let expr = expr.clone();
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if let Some(payment) = expr.final_payment() {
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accounts[1].tokens += payment.tokens;
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Ok(())
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} else {
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let existing = Self::deserialize(&accounts[1].userdata).ok();
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if Some(true) == existing.map(|x| x.initialized) {
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trace!("contract already exists");
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Err(BudgetError::ContractAlreadyExists)
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} else {
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let mut state = BudgetState::default();
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state.pending_budget = Some(expr);
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accounts[1].tokens += accounts[0].tokens;
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accounts[0].tokens = 0;
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state.initialized = true;
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state.serialize(&mut accounts[1].userdata)
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}
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}
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}
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Instruction::ApplyTimestamp(dt) => {
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if let Ok(mut state) = Self::deserialize(&accounts[1].userdata) {
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if !state.is_pending() {
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Err(BudgetError::ContractNotPending)
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} else if !state.initialized {
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trace!("contract is uninitialized");
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Err(BudgetError::UninitializedContract)
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} else {
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trace!("apply timestamp");
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state.apply_timestamp(tx, instruction_index, accounts, *dt)?;
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trace!("apply timestamp committed");
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state.serialize(&mut accounts[1].userdata)
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}
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} else {
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Err(BudgetError::UninitializedContract)
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}
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}
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Instruction::ApplySignature => {
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if let Ok(mut state) = Self::deserialize(&accounts[1].userdata) {
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if !state.is_pending() {
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Err(BudgetError::ContractNotPending)
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} else if !state.initialized {
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trace!("contract is uninitialized");
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Err(BudgetError::UninitializedContract)
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} else {
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trace!("apply signature");
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state.apply_signature(tx, instruction_index, accounts)?;
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trace!("apply signature committed");
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state.serialize(&mut accounts[1].userdata)
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}
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} else {
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Err(BudgetError::UninitializedContract)
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}
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}
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}
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}
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fn serialize(&self, output: &mut [u8]) -> Result<(), BudgetError> {
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let len = serialized_size(self).unwrap() as u64;
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if output.len() < len as usize {
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warn!(
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"{} bytes required to serialize, only have {} bytes",
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len,
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output.len()
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);
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return Err(BudgetError::UserdataTooSmall);
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}
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{
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let writer = io::BufWriter::new(&mut output[..8]);
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serialize_into(writer, &len).unwrap();
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}
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{
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let writer = io::BufWriter::new(&mut output[8..8 + len as usize]);
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serialize_into(writer, self).unwrap();
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}
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Ok(())
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}
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pub fn deserialize(input: &[u8]) -> bincode::Result<Self> {
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if input.len() < 8 {
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return Err(Box::new(bincode::ErrorKind::SizeLimit));
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}
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let len: u64 = deserialize(&input[..8]).unwrap();
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if len < 2 {
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return Err(Box::new(bincode::ErrorKind::SizeLimit));
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}
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if input.len() < 8 + len as usize {
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return Err(Box::new(bincode::ErrorKind::SizeLimit));
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}
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deserialize(&input[8..8 + len as usize])
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}
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/// Budget DSL contract interface
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/// * tx - the transaction
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/// * accounts[0] - The source of the tokens
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/// * accounts[1] - The contract context. Once the contract has been completed, the tokens can
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/// be spent from this account .
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pub fn process_transaction(
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tx: &Transaction,
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instruction_index: usize,
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accounts: &mut [&mut Account],
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) -> Result<(), BudgetError> {
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if let Ok(instruction) = deserialize(tx.userdata(instruction_index)) {
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trace!("process_transaction: {:?}", instruction);
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Self::apply_debits_to_budget_state(tx, instruction_index, accounts, &instruction)
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} else {
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info!(
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"Invalid transaction userdata: {:?}",
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tx.userdata(instruction_index)
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);
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Err(BudgetError::UserdataDeserializeFailure)
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}
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}
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//TODO the contract needs to provide a "get_balance" introspection call of the userdata
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pub fn get_balance(account: &Account) -> u64 {
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if let Ok(state) = deserialize(&account.userdata) {
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let state: BudgetState = state;
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if state.is_pending() {
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0
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} else {
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account.tokens
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}
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} else {
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account.tokens
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}
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}
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}
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#[cfg(test)]
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mod test {
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use bincode::serialize;
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use budget_program::{BudgetError, BudgetState};
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use budget_transaction::BudgetTransaction;
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use chrono::prelude::{DateTime, NaiveDate, Utc};
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use hash::Hash;
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use signature::{GenKeys, Keypair, KeypairUtil};
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use solana_sdk::account::Account;
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use solana_sdk::pubkey::Pubkey;
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use transaction::Transaction;
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fn process_transaction(tx: &Transaction, accounts: &mut [Account]) -> Result<(), BudgetError> {
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let mut refs: Vec<&mut Account> = accounts.iter_mut().collect();
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BudgetState::process_transaction(&tx, 0, &mut refs[..])
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}
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#[test]
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fn test_serializer() {
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let mut a = Account::new(0, 512, BudgetState::id());
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let b = BudgetState::default();
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b.serialize(&mut a.userdata).unwrap();
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let buf = serialize(&b).unwrap();
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assert_eq!(a.userdata[8..8 + buf.len()], buf[0..]);
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let c = BudgetState::deserialize(&a.userdata).unwrap();
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assert_eq!(b, c);
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}
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#[test]
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fn test_serializer_userdata_too_small() {
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let mut a = Account::new(0, 1, BudgetState::id());
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let b = BudgetState::default();
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assert_eq!(
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b.serialize(&mut a.userdata),
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Err(BudgetError::UserdataTooSmall)
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);
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}
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#[test]
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fn test_invalid_instruction() {
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let mut accounts = vec![
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Account::new(1, 0, BudgetState::id()),
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Account::new(0, 512, BudgetState::id()),
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];
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let from = Keypair::new();
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let contract = Keypair::new();
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let userdata = (1u8, 2u8, 3u8);
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let tx = Transaction::new(
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&from,
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&[contract.pubkey()],
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BudgetState::id(),
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&userdata,
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Hash::default(),
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0,
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);
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assert!(process_transaction(&tx, &mut accounts).is_err());
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}
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#[test]
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fn test_unsigned_witness_key() {
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let mut accounts = vec![
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Account::new(1, 0, BudgetState::id()),
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Account::new(0, 512, BudgetState::id()),
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Account::new(0, 0, BudgetState::id()),
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];
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// Initialize BudgetState
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let from = Keypair::new();
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let contract = Keypair::new().pubkey();
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let to = Keypair::new().pubkey();
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let witness = Keypair::new().pubkey();
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let tx = Transaction::budget_new_when_signed(
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&from,
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to,
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contract,
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witness,
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None,
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1,
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Hash::default(),
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);
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process_transaction(&tx, &mut accounts).unwrap();
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// Attack! Part 1: Sign a witness transaction with a random key.
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let rando = Keypair::new();
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let mut tx = Transaction::budget_new_signature(&rando, contract, to, Hash::default());
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// Attack! Part 2: Point the instruction to the expected, but unsigned, key.
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tx.account_keys.push(from.pubkey());
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tx.instructions[0].accounts[0] = 3;
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// Ensure the transaction fails because of the unsigned key.
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assert_eq!(
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process_transaction(&tx, &mut accounts),
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Err(BudgetError::UnsignedKey)
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);
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}
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#[test]
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fn test_unsigned_timestamp() {
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let mut accounts = vec![
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Account::new(1, 0, BudgetState::id()),
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Account::new(0, 512, BudgetState::id()),
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Account::new(0, 0, BudgetState::id()),
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];
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// Initialize BudgetState
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let from = Keypair::new();
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let contract = Keypair::new().pubkey();
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let to = Keypair::new().pubkey();
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let dt = Utc::now();
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let tx = Transaction::budget_new_on_date(
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&from,
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to,
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contract,
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dt,
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from.pubkey(),
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None,
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1,
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Hash::default(),
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);
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process_transaction(&tx, &mut accounts).unwrap();
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// Attack! Part 1: Sign a timestamp transaction with a random key.
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let rando = Keypair::new();
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let mut tx = Transaction::budget_new_timestamp(&rando, contract, to, dt, Hash::default());
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// Attack! Part 2: Point the instruction to the expected, but unsigned, key.
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tx.account_keys.push(from.pubkey());
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tx.instructions[0].accounts[0] = 3;
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// Ensure the transaction fails because of the unsigned key.
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assert_eq!(
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process_transaction(&tx, &mut accounts),
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Err(BudgetError::UnsignedKey)
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);
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}
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#[test]
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fn test_transfer_on_date() {
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let mut accounts = vec![
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Account::new(1, 0, BudgetState::id()),
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Account::new(0, 512, BudgetState::id()),
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Account::new(0, 0, BudgetState::id()),
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];
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let from_account = 0;
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let contract_account = 1;
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let to_account = 2;
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let from = Keypair::new();
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let contract = Keypair::new();
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let to = Keypair::new();
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let rando = Keypair::new();
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let dt = Utc::now();
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let tx = Transaction::budget_new_on_date(
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&from,
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to.pubkey(),
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contract.pubkey(),
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dt,
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from.pubkey(),
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None,
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1,
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Hash::default(),
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);
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process_transaction(&tx, &mut accounts).unwrap();
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assert_eq!(accounts[from_account].tokens, 0);
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assert_eq!(accounts[contract_account].tokens, 1);
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let state = BudgetState::deserialize(&accounts[contract_account].userdata).unwrap();
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assert!(state.is_pending());
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// Attack! Try to payout to a rando key
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let tx = Transaction::budget_new_timestamp(
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&from,
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contract.pubkey(),
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rando.pubkey(),
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dt,
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Hash::default(),
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);
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assert_eq!(
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process_transaction(&tx, &mut accounts),
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Err(BudgetError::DestinationMissing)
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);
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assert_eq!(accounts[from_account].tokens, 0);
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assert_eq!(accounts[contract_account].tokens, 1);
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assert_eq!(accounts[to_account].tokens, 0);
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let state = BudgetState::deserialize(&accounts[contract_account].userdata).unwrap();
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assert!(state.is_pending());
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// Now, acknowledge the time in the condition occurred and
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// that pubkey's funds are now available.
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let tx = Transaction::budget_new_timestamp(
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&from,
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contract.pubkey(),
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to.pubkey(),
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dt,
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Hash::default(),
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);
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process_transaction(&tx, &mut accounts).unwrap();
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assert_eq!(accounts[from_account].tokens, 0);
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assert_eq!(accounts[contract_account].tokens, 0);
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assert_eq!(accounts[to_account].tokens, 1);
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let state = BudgetState::deserialize(&accounts[contract_account].userdata).unwrap();
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assert!(!state.is_pending());
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// try to replay the timestamp contract
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assert_eq!(
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process_transaction(&tx, &mut accounts),
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Err(BudgetError::ContractNotPending)
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);
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assert_eq!(accounts[from_account].tokens, 0);
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assert_eq!(accounts[contract_account].tokens, 0);
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assert_eq!(accounts[to_account].tokens, 1);
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}
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#[test]
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fn test_cancel_transfer() {
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let mut accounts = vec![
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Account::new(1, 0, BudgetState::id()),
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Account::new(0, 512, BudgetState::id()),
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Account::new(0, 0, BudgetState::id()),
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];
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let from_account = 0;
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let contract_account = 1;
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let pay_account = 2;
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let from = Keypair::new();
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let contract = Keypair::new();
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let to = Keypair::new();
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let dt = Utc::now();
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let tx = Transaction::budget_new_on_date(
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&from,
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to.pubkey(),
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contract.pubkey(),
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dt,
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from.pubkey(),
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Some(from.pubkey()),
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1,
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Hash::default(),
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);
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process_transaction(&tx, &mut accounts).unwrap();
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assert_eq!(accounts[from_account].tokens, 0);
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assert_eq!(accounts[contract_account].tokens, 1);
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let state = BudgetState::deserialize(&accounts[contract_account].userdata).unwrap();
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assert!(state.is_pending());
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// Attack! try to put the tokens into the wrong account with cancel
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let tx =
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Transaction::budget_new_signature(&to, contract.pubkey(), to.pubkey(), Hash::default());
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// unit test hack, the `from account` is passed instead of the `to` account to avoid
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// creating more account vectors
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process_transaction(&tx, &mut accounts).unwrap();
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// nothing should be changed because apply witness didn't finalize a payment
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assert_eq!(accounts[from_account].tokens, 0);
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assert_eq!(accounts[contract_account].tokens, 1);
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// this would be the `to.pubkey()` account
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assert_eq!(accounts[pay_account].tokens, 0);
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// Now, cancel the transaction. from gets her funds back
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let tx = Transaction::budget_new_signature(
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&from,
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contract.pubkey(),
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from.pubkey(),
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Hash::default(),
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);
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process_transaction(&tx, &mut accounts).unwrap();
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assert_eq!(accounts[from_account].tokens, 0);
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assert_eq!(accounts[contract_account].tokens, 0);
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assert_eq!(accounts[pay_account].tokens, 1);
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// try to replay the signature contract
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|
let tx = Transaction::budget_new_signature(
|
|
&from,
|
|
contract.pubkey(),
|
|
from.pubkey(),
|
|
Hash::default(),
|
|
);
|
|
assert_eq!(
|
|
process_transaction(&tx, &mut accounts),
|
|
Err(BudgetError::ContractNotPending)
|
|
);
|
|
assert_eq!(accounts[from_account].tokens, 0);
|
|
assert_eq!(accounts[contract_account].tokens, 0);
|
|
assert_eq!(accounts[pay_account].tokens, 1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_userdata_too_small() {
|
|
let mut accounts = vec![
|
|
Account::new(1, 0, BudgetState::id()),
|
|
Account::new(1, 0, BudgetState::id()), // <== userdata is 0, which is not enough
|
|
Account::new(1, 0, BudgetState::id()),
|
|
];
|
|
let from = Keypair::new();
|
|
let contract = Keypair::new();
|
|
let to = Keypair::new();
|
|
let tx = Transaction::budget_new_on_date(
|
|
&from,
|
|
to.pubkey(),
|
|
contract.pubkey(),
|
|
Utc::now(),
|
|
from.pubkey(),
|
|
None,
|
|
1,
|
|
Hash::default(),
|
|
);
|
|
|
|
assert!(process_transaction(&tx, &mut accounts).is_err());
|
|
assert!(BudgetState::deserialize(&accounts[1].userdata).is_err());
|
|
|
|
let tx = Transaction::budget_new_timestamp(
|
|
&from,
|
|
contract.pubkey(),
|
|
to.pubkey(),
|
|
Utc::now(),
|
|
Hash::default(),
|
|
);
|
|
assert!(process_transaction(&tx, &mut accounts).is_err());
|
|
assert!(BudgetState::deserialize(&accounts[1].userdata).is_err());
|
|
|
|
// Success if there was no panic...
|
|
}
|
|
|
|
/// Detect binary changes in the serialized contract userdata, which could have a downstream
|
|
/// affect on SDKs and DApps
|
|
#[test]
|
|
fn test_sdk_serialize() {
|
|
let keypair = &GenKeys::new([0u8; 32]).gen_n_keypairs(1)[0];
|
|
let to = Pubkey::new(&[
|
|
1, 1, 1, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 8, 7, 6, 5, 4,
|
|
1, 1, 1,
|
|
]);
|
|
let contract = Pubkey::new(&[
|
|
2, 2, 2, 4, 5, 6, 7, 8, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 8, 7, 6, 5, 4,
|
|
2, 2, 2,
|
|
]);
|
|
let date =
|
|
DateTime::<Utc>::from_utc(NaiveDate::from_ymd(2016, 7, 8).and_hms(9, 10, 11), Utc);
|
|
let date_iso8601 = "2016-07-08T09:10:11Z";
|
|
|
|
let tx = Transaction::budget_new(&keypair, to, 192, Hash::default());
|
|
assert_eq!(
|
|
tx.userdata(0).to_vec(),
|
|
vec![2, 0, 0, 0, 192, 0, 0, 0, 0, 0, 0, 0]
|
|
);
|
|
assert_eq!(
|
|
tx.userdata(1).to_vec(),
|
|
vec![
|
|
0, 0, 0, 0, 0, 0, 0, 0, 192, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 4, 5, 6, 7, 8, 9, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 8, 7, 6, 5, 4, 1, 1, 1
|
|
]
|
|
);
|
|
|
|
let tx = Transaction::budget_new_on_date(
|
|
&keypair,
|
|
to,
|
|
contract,
|
|
date,
|
|
keypair.pubkey(),
|
|
Some(keypair.pubkey()),
|
|
192,
|
|
Hash::default(),
|
|
);
|
|
assert_eq!(
|
|
tx.userdata(0).to_vec(),
|
|
vec![
|
|
0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 50, 48, 49, 54, 45,
|
|
48, 55, 45, 48, 56, 84, 48, 57, 58, 49, 48, 58, 49, 49, 90, 32, 253, 186, 201, 177,
|
|
11, 117, 135, 187, 167, 181, 188, 22, 59, 206, 105, 231, 150, 215, 30, 78, 212, 76,
|
|
16, 252, 180, 72, 134, 137, 247, 161, 68, 192, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 4, 5,
|
|
6, 7, 8, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 8, 7, 6, 5, 4, 1, 1, 1, 1,
|
|
0, 0, 0, 32, 253, 186, 201, 177, 11, 117, 135, 187, 167, 181, 188, 22, 59, 206,
|
|
105, 231, 150, 215, 30, 78, 212, 76, 16, 252, 180, 72, 134, 137, 247, 161, 68, 192,
|
|
0, 0, 0, 0, 0, 0, 0, 32, 253, 186, 201, 177, 11, 117, 135, 187, 167, 181, 188, 22,
|
|
59, 206, 105, 231, 150, 215, 30, 78, 212, 76, 16, 252, 180, 72, 134, 137, 247, 161,
|
|
68
|
|
]
|
|
);
|
|
|
|
// ApplyTimestamp(date)
|
|
let tx = Transaction::budget_new_timestamp(
|
|
&keypair,
|
|
keypair.pubkey(),
|
|
to,
|
|
date,
|
|
Hash::default(),
|
|
);
|
|
let mut expected_userdata = vec![1, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0];
|
|
expected_userdata.extend(date_iso8601.as_bytes());
|
|
assert_eq!(tx.userdata(0).to_vec(), expected_userdata);
|
|
|
|
// ApplySignature
|
|
let tx = Transaction::budget_new_signature(&keypair, keypair.pubkey(), to, Hash::default());
|
|
assert_eq!(tx.userdata(0).to_vec(), vec![2, 0, 0, 0]);
|
|
}
|
|
}
|