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safe_hashes.sh
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#!/usr/bin/env bash
########################
# Don't trust, verify! #
########################
# @license GNU Affero General Public License v3.0 only
# @author pcaversaccio
# Set the terminal formatting constants.
readonly GREEN="\e[32m"
readonly RED="\e[31m"
readonly UNDERLINE="\e[4m"
readonly BOLD="\e[1m"
readonly RESET="\e[0m"
# Check the Bash version compatibility.
if [[ "${BASH_VERSINFO[0]:-0}" -lt 4 ]]; then
echo -e "${BOLD}${RED}Error: This script requires Bash 4.0 or higher!${RESET}"
echo -e "${BOLD}${RED}Current version: $BASH_VERSION${RESET}"
echo -e "${BOLD}${RED}Please upgrade your Bash installation.${RESET}"
echo -e "${BOLD}${RED}If you've already upgraded via Homebrew, try running:${RESET}"
echo -e "${BOLD}${RED}/opt/homebrew/bin/bash $0 $@${RESET}"
exit 1
fi
# Utility function to ensure all required tools are installed.
check_required_tools() {
local tools=("curl" "jq" "chisel" "cast")
local missing_tools=()
for tool in "${tools[@]}"; do
if ! command -v "$tool" &>/dev/null; then
missing_tools+=("$tool")
fi
done
if [[ ${#missing_tools[@]} -ne 0 ]]; then
echo -e "${BOLD}${RED}The following required tools are not installed:${RESET}"
for tool in "${missing_tools[@]}"; do
echo -e "${BOLD}${RED} - $tool${RESET}"
done
echo -e "${BOLD}${RED}Please install them to run the script properly.${RESET}"
exit 1
fi
}
check_required_tools
# Enable strict error handling:
# -E: Inherit `ERR` traps in functions and subshells.
# -e: Exit immediately if a command exits with a non-zero status.
# -u: Treat unset variables as an error and exit.
# -o pipefail: Return the exit status of the first failed command in a pipeline.
set -Eeuo pipefail
# Enable debug mode if the environment variable `DEBUG` is set to `true`.
if [[ "${DEBUG:-false}" == "true" ]]; then
# Print each command before executing it.
set -x
fi
# Set the zero address as a global constant.
readonly ZERO_ADDRESS="0x0000000000000000000000000000000000000000"
# Set a global flag indicating whether a delegate call warning was already displayed
# to the user. Used to determine proper spacing between multiple warnings.
delegate_call_warning_shown="false"
# Set a global variable to store the Safe transaction hash for use across multiple functions.
global_safe_tx_hash="0x0000000000000000000000000000000000000000000000000000000000000000"
# Set the type hash constants.
# => `keccak256("EIP712Domain(uint256 chainId,address verifyingContract)");`
# See: https://github.com/safe-global/safe-smart-account/blob/a0a1d4292006e26c4dbd52282f4c932e1ffca40f/contracts/Safe.sol#L54-L57.
readonly DOMAIN_SEPARATOR_TYPEHASH="0x47e79534a245952e8b16893a336b85a3d9ea9fa8c573f3d803afb92a79469218"
# => `keccak256("EIP712Domain(address verifyingContract)");`
# See: https://github.com/safe-global/safe-smart-account/blob/703dde2ea9882a35762146844d5cfbeeec73e36f/contracts/GnosisSafe.sol#L20-L23.
readonly DOMAIN_SEPARATOR_TYPEHASH_OLD="0x035aff83d86937d35b32e04f0ddc6ff469290eef2f1b692d8a815c89404d4749"
# => `keccak256("SafeTx(address to,uint256 value,bytes data,uint8 operation,uint256 safeTxGas,uint256 baseGas,uint256 gasPrice,address gasToken,address refundReceiver,uint256 nonce)");`
# See: https://github.com/safe-global/safe-smart-account/blob/a0a1d4292006e26c4dbd52282f4c932e1ffca40f/contracts/Safe.sol#L59-L62.
readonly SAFE_TX_TYPEHASH="0xbb8310d486368db6bd6f849402fdd73ad53d316b5a4b2644ad6efe0f941286d8"
# => `keccak256("SafeTx(address to,uint256 value,bytes data,uint8 operation,uint256 safeTxGas,uint256 dataGas,uint256 gasPrice,address gasToken,address refundReceiver,uint256 nonce)");`
# See: https://github.com/safe-global/safe-smart-account/blob/427d6f7e779431333c54bcb4d4cde31e4d57ce96/contracts/GnosisSafe.sol#L25-L28.
readonly SAFE_TX_TYPEHASH_OLD="0x14d461bc7412367e924637b363c7bf29b8f47e2f84869f4426e5633d8af47b20"
# => `keccak256("SafeMessage(bytes message)");`
# See: https://github.com/safe-global/safe-smart-account/blob/febab5e4e859e6e65914f17efddee415e4992961/contracts/libraries/SignMessageLib.sol#L12-L13.
readonly SAFE_MSG_TYPEHASH="0x60b3cbf8b4a223d68d641b3b6ddf9a298e7f33710cf3d3a9d1146b5a6150fbca"
# Set the trusted (i.e. for delegate calls) `MultiSendCallOnly` addresses:
# MultiSendCallOnly `v1.3.0` (canonical): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.3.0/multi_send_call_only.json#L7,
# MultiSendCallOnly `v1.3.0` (eip155): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.3.0/multi_send_call_only.json#L11,
# MultiSendCallOnly `v1.3.0` (zksync): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.3.0/multi_send_call_only.json#L15,
# MultiSendCallOnly `v1.4.1` (canonical): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.4.1/multi_send_call_only.json#L7,
# MultiSendCallOnly `v1.4.1` (zksync): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.4.1/multi_send_call_only.json#L11.
declare -a -r MultiSendCallOnly=(
"0x40A2aCCbd92BCA938b02010E17A5b8929b49130D" # MultiSendCallOnly `v1.3.0` (canonical).
"0xA1dabEF33b3B82c7814B6D82A79e50F4AC44102B" # MultiSendCallOnly `v1.3.0` (eip155).
"0xf220D3b4DFb23C4ade8C88E526C1353AbAcbC38F" # MultiSendCallOnly `v1.3.0` (zksync).
"0x9641d764fc13c8B624c04430C7356C1C7C8102e2" # MultiSendCallOnly `v1.4.1` (canonical).
"0x0408EF011960d02349d50286D20531229BCef773" # MultiSendCallOnly `v1.4.1` (zksync).
)
# Set the trusted (i.e. for delegate calls) `SafeMigration` addresses:
# SafeMigration `v1.4.1` (canonical): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.4.1/safe_migration.json#L7,
# SafeMigration `v1.4.1` (zksync): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.4.1/safe_migration.json#L11.
declare -a -r SafeMigration=(
"0x526643F69b81B008F46d95CD5ced5eC0edFFDaC6" # SafeMigration `v1.4.1` (canonical).
"0x817756C6c555A94BCEE39eB5a102AbC1678b09A7" # SafeMigration `v1.4.1` (zksync).
)
# Set the trusted (i.e. for delegate calls) `SignMessageLib` addresses:
# SignMessageLib `v1.3.0` (canonical): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.3.0/sign_message_lib.json#L7,
# SignMessageLib `v1.3.0` (eip155): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.3.0/sign_message_lib.json#L11,
# SignMessageLib `v1.3.0` (zksync): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.3.0/sign_message_lib.json#L15,
# SignMessageLib `v1.4.1` (canonical): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.4.1/sign_message_lib.json#L7,
# SignMessageLib `v1.4.1` (zksync): https://github.com/safe-global/safe-deployments/blob/cc1ac692a5fcc70696cb66bb94d1c2cad3ec68ee/src/assets/v1.4.1/sign_message_lib.json#L11.
declare -a -r SignMessageLib=(
"0xA65387F16B013cf2Af4605Ad8aA5ec25a2cbA3a2" # SignMessageLib `v1.3.0` (canonical).
"0x98FFBBF51bb33A056B08ddf711f289936AafF717" # SignMessageLib `v1.3.0` (eip155).
"0x357147caf9C0cCa67DfA0CF5369318d8193c8407" # SignMessageLib `v1.3.0` (zksync).
"0xd53cd0aB83D845Ac265BE939c57F53AD838012c9" # SignMessageLib `v1.4.1` (canonical).
"0xAca1ec0a1A575CDCCF1DC3d5d296202Eb6061888" # SignMessageLib `v1.4.1` (zksync).
)
# Set the trusted (i.e. for delegate calls) contract addresses.
# See: https://github.com/safe-global/safe-transaction-service/blob/0e6da1d19cec56f8e2834e6159f2d25733c64843/safe_transaction_service/contracts/management/commands/setup_safe_contracts.py#L15-L19.
declare -A -r TRUSTED_FOR_DELEGATE_CALL=(
["MultiSendCallOnly"]="${MultiSendCallOnly[@]}"
["SafeMigration"]="${SafeMigration[@]}"
["SignMessageLib"]="${SignMessageLib[@]}"
)
# Define the supported networks from the Safe transaction service.
# See https://docs.safe.global/advanced/smart-account-supported-networks?service=Transaction+Service.
declare -A -r API_URLS=(
["arbitrum"]="https://safe-transaction-arbitrum.safe.global"
["aurora"]="https://safe-transaction-aurora.safe.global"
["avalanche"]="https://safe-transaction-avalanche.safe.global"
["base"]="https://safe-transaction-base.safe.global"
["base-sepolia"]="https://safe-transaction-base-sepolia.safe.global"
["berachain"]="https://safe-transaction-berachain.safe.global"
["blast"]="https://safe-transaction-blast.safe.global"
["bsc"]="https://safe-transaction-bsc.safe.global"
["celo"]="https://safe-transaction-celo.safe.global"
["ethereum"]="https://safe-transaction-mainnet.safe.global"
["gnosis"]="https://safe-transaction-gnosis-chain.safe.global"
["gnosis-chiado"]="https://safe-transaction-chiado.safe.global"
["ink"]="https://safe-transaction-ink.safe.global"
["linea"]="https://safe-transaction-linea.safe.global"
["mantle"]="https://safe-transaction-mantle.safe.global"
["optimism"]="https://safe-transaction-optimism.safe.global"
["polygon"]="https://safe-transaction-polygon.safe.global"
["polygon-zkevm"]="https://safe-transaction-zkevm.safe.global"
["scroll"]="https://safe-transaction-scroll.safe.global"
["sepolia"]="https://safe-transaction-sepolia.safe.global"
["sonic"]="https://safe-transaction-sonic.safe.global"
["unichain"]="https://safe-transaction-unichain.safe.global"
["worldchain"]="https://safe-transaction-worldchain.safe.global"
["xlayer"]="https://safe-transaction-xlayer.safe.global"
["zksync"]="https://safe-transaction-zksync.safe.global"
)
# Define the chain IDs of the supported networks from the Safe transaction service.
declare -A -r CHAIN_IDS=(
["arbitrum"]="42161"
["aurora"]="1313161554"
["avalanche"]="43114"
["base"]="8453"
["base-sepolia"]="84532"
["berachain"]="80094"
["blast"]="81457"
["bsc"]="56"
["celo"]="42220"
["ethereum"]="1"
["gnosis"]="100"
["gnosis-chiado"]="10200"
["ink"]="57073"
["linea"]="59144"
["mantle"]="5000"
["optimism"]="10"
["polygon"]="137"
["polygon-zkevm"]="1101"
["scroll"]="534352"
["sepolia"]="11155111"
["sonic"]="146"
["unichain"]="130"
["worldchain"]="480"
["xlayer"]="196"
["zksync"]="324"
)
# Utility function to display the usage information.
usage() {
cat <<EOF
Usage: $0 [--help] [--version] [--list-networks]
--network <network> --address <address> [--nonce <nonce>]
[--nested-safe-address <address>] [--nested-safe-nonce <nonce>]
[--message <file>] [--interactive]
Options:
--help Display this help message
--version Display the latest local commit hash (=version) of the script
--list-networks List all supported networks and their chain IDs
--network <network> Specify the network (required)
--address <address> Specify the Safe multisig address (required)
--nonce <nonce> Specify the transaction nonce (required for transaction hashes)
--nested-safe-address <address> Specify the nested Safe multisig address (optional for transaction hashes or off-chain message hashes)
--nested-safe-nonce <nonce> Specify the nonce for the nested Safe transaction (optional for transaction hashes)
--message <file> Specify the message file (required for off-chain message hashes)
--interactive Use the interactive mode (optional for transaction hashes)
Example for transaction hashes:
$0 --network ethereum --address 0x1234...5678 --nonce 42
Example for transaction hashes (interactive mode):
$0 --network ethereum --address 0x1234...5678 --nonce 42 --interactive
Example for transaction hashes via a nested Safe multisig approval:
$0 --network ethereum --address 0x1234...5678 --nonce 42 --nested-safe-address 0x8765...4321 --nested-safe-nonce 10
Example for transaction hashes via a nested Safe multisig approval (interactive mode):
$0 --network ethereum --address 0x1234...5678 --nonce 42 --nested-safe-address 0x8765...4321 --nested-safe-nonce 10 --interactive
Example for off-chain message hashes:
$0 --network ethereum --address 0x1234...5678 --message message.txt
Example for off-chain message hashes via a nested Safe multisig signer:
$0 --network ethereum --address 0x1234...5678 --nested-safe-address 0x8765...4321 --message message.txt
EOF
exit "${1:-1}"
}
# Utility function to retrieve the latest local commit hash from the Git repository.
# We don't include `git` in the `check_required_tools` function to avoid making
# it a strict dependency for the script to run.
get_latest_git_commit_hash() {
local commit_hash=""
if command -v git &>/dev/null; then
commit_hash=$(git rev-parse HEAD 2>/dev/null)
if [[ -n "$commit_hash" ]]; then
echo -e "Latest local commit hash (=version) of the script: ${GREEN}$commit_hash${RESET}."
exit 0
else
echo -e "${BOLD}${RED}No commit hash information available. There may be an issue with your Git installation or repository configuration.${RESET}"
exit 1
fi
else
echo -e "${BOLD}${RED}Git is not installed or not found. Unable to retrieve the commit hash information!${RESET}"
exit 1
fi
}
# Utility function to list all supported networks.
list_networks() {
echo "Supported Networks:"
for network in $(echo "${!CHAIN_IDS[@]}" | tr " " "\n" | sort); do
echo " $network (${CHAIN_IDS[$network]})"
done
exit 0
}
# Utility function to print a section header.
print_header() {
local header=$1
if [[ -t 1 ]] && tput sgr0 >/dev/null 2>&1; then
# Terminal supports formatting.
printf "\n${UNDERLINE}%s${RESET}\n" "$header"
else
# Fallback for terminals without formatting support.
printf "\n%s\n" "> $header:"
fi
}
# Utility function to print a labelled value.
print_field() {
local label=$1
local value=$2
local empty_line="${3:-false}"
if [[ -t 1 ]] && tput sgr0 >/dev/null 2>&1; then
# Terminal supports formatting.
printf "%s: ${GREEN}%s${RESET}\n" "$label" "$value"
else
# Fallback for terminals without formatting support.
printf "%s: %s\n" "$label" "$value"
fi
# Print an empty line if requested.
if [[ "$empty_line" == "true" ]]; then
printf "\n"
fi
}
# Utility function to print the transaction data.
print_transaction_data() {
local address=$1
local to=$2
local value=$3
local data=$4
local operation=$5
local safe_tx_gas=$6
local base_gas=$7
local gas_price=$8
local gas_token=$9
local refund_receiver=${10}
local nonce=${11}
local message=${12}
print_header "Transaction Data"
print_field "Multisig address" "$address"
print_field "To" "$to"
print_field "Value" "$value"
print_field "Data" "$data"
case "$operation" in
1)
if [[ "$operation" -eq 1 && ! " ${TRUSTED_FOR_DELEGATE_CALL[@]} " =~ " ${to} " ]]; then
print_field "Operation" "Delegatecall $(tput setaf 1)(UNTRUSTED delegatecall; carefully verify before proceeding!)$(tput sgr0)"
else
print_field "Operation" "Delegatecall $(tput setaf 3)(trusted delegatecall)$(tput sgr0)"
fi
;;
0)
print_field "Operation" "Call"
;;
*)
print_field "Operation" "Unknown"
;;
esac
print_field "Safe Transaction Gas" "$safe_tx_gas"
print_field "Base Gas" "$base_gas"
print_field "Gas Price" "$gas_price"
print_field "Gas Token" "$gas_token"
print_field "Refund Receiver" "$refund_receiver"
print_field "Nonce" "$nonce"
print_field "Encoded message" "$message"
}
# Utility function to format the hash (keep `0x` lowercase, rest uppercase).
format_hash() {
local hash=$1
local prefix="${hash:0:2}"
local rest="${hash:2}"
echo "${prefix,,}${rest^^}"
}
# Utility function to print the hash information.
print_hash_info() {
local domain_hash=$1
local message_hash=$2
local safe_tx_hash=$3
print_header "Hashes"
print_field "Domain hash" "$(format_hash "$domain_hash")"
print_field "Message hash" "$(format_hash "$message_hash")"
print_field "Safe transaction hash" "$safe_tx_hash"
}
# Utility function to print the ABI-decoded transaction data.
print_decoded_data() {
local data=$1
local data_decoded=$2
if [[ "$data" == "0x" && "$data_decoded" == "0x" ]]; then
print_field "Method" "0x (ETH Transfer)"
print_field "Parameters" "[]"
elif [[ "$data" != "0x" && "$data_decoded" == "0x" ]]; then
print_field "Method" "Unknown"
print_field "Parameters" "Unknown"
elif [[ "$data_decoded" == "interactive" ]]; then
print_field "Method" "Unavailable in interactive mode"
print_field "Parameters" "Unavailable in interactive mode"
else
local method=$(echo "$data_decoded" | jq -r ".method")
local parameters=$(echo "$data_decoded" | jq -r ".parameters")
print_field "Method" "$method"
print_field "Parameters" "$parameters"
# Check if the called function is sensitive and print a warning in bold.
case "$method" in
addOwnerWithThreshold | removeOwner | swapOwner | changeThreshold)
echo
echo -e "${BOLD}${RED}WARNING: The \"$method\" function modifies the owners or threshold of the Safe. Proceed with caution!${RESET}"
;;
esac
# Check for sensitive functions in nested transactions.
echo "$parameters" | jq -c ".[] | .valueDecoded[]? | select(.dataDecoded != null)" | while read -r nested_param; do
nested_method=$(echo "$nested_param" | jq -r ".dataDecoded.method")
if [[ "$nested_method" =~ ^(addOwnerWithThreshold|removeOwner|swapOwner|changeThreshold)$ ]]; then
echo
echo -e "${BOLD}${RED}WARNING: The \"$nested_method\" function modifies the owners or threshold of the Safe! Proceed with caution!${RESET}"
fi
done
fi
}
# Utility function to extract the clean Safe multisig version.
get_version() {
local version=$1
# Safe multisig versions can have the format `X.Y.Z+L2`.
# Remove any suffix after and including the `+` in the version string for comparison.
local clean_version=$(echo "$version" | sed "s/+.*//")
echo "$clean_version"
}
# Utility function to validate the Safe multisig version.
validate_version() {
local version=$1
if [[ -z "$version" ]]; then
echo "$(tput setaf 3)No Safe multisig contract found for the specified network. Please ensure that you have selected the correct network.$(tput sgr0)"
exit 0
fi
local clean_version=$(get_version "$version")
# Ensure that the Safe multisig version is `>= 0.1.0`.
if [[ "$(printf "%s\n%s" "$clean_version" "0.1.0" | sort -V | head -n1)" == "$clean_version" && "$clean_version" != "0.1.0" ]]; then
echo "$(tput setaf 3)Safe multisig version \"${clean_version}\" is not supported!$(tput sgr0)"
exit 0
fi
}
# Utility function to calculate the domain hash.
calculate_domain_hash() {
local version=$1
local domain_separator_typehash=$2
local domain_hash_args=$3
# Validate the Safe multisig version.
validate_version "$version"
local clean_version=$(get_version "$version")
# Safe multisig versions `<= 1.2.0` use a legacy (i.e. without `chainId`) `DOMAIN_SEPARATOR_TYPEHASH` value.
# Starting with version `1.3.0`, the `chainId` field was introduced: https://github.com/safe-global/safe-smart-account/pull/264.
if [[ "$(printf "%s\n%s" "$clean_version" "1.2.0" | sort -V | head -n1)" == "$clean_version" ]]; then
domain_separator_typehash="$DOMAIN_SEPARATOR_TYPEHASH_OLD"
domain_hash_args="$domain_separator_typehash, $address"
fi
# Calculate the domain hash.
local domain_hash=$(chisel eval "keccak256(abi.encode($domain_hash_args))" |
awk '/Data:/ {gsub(/\x1b\[[0-9;]*m/, "", $3); print $3}')
echo "$domain_hash"
}
# Utility function to calculate the domain and message hashes.
calculate_hashes() {
local chain_id=$1
local address=$2
local to=$3
local value=$4
local data=$5
local operation=$6
local safe_tx_gas=$7
local base_gas=$8
local gas_price=$9
local gas_token=${10}
local refund_receiver=${11}
local nonce=${12}
local data_decoded=${13}
local version=${14}
local update_global_safe_tx_hash=${15:-}
local domain_separator_typehash="$DOMAIN_SEPARATOR_TYPEHASH"
local domain_hash_args="$domain_separator_typehash, $chain_id, $address"
local safe_tx_typehash="$SAFE_TX_TYPEHASH"
# Validate the Safe multisig version.
validate_version "$version"
local clean_version=$(get_version "$version")
# Calculate the domain hash.
local domain_hash=$(calculate_domain_hash "$version" "$domain_separator_typehash" "$domain_hash_args")
# Calculate the data hash.
# The dynamic value `bytes` is encoded as a `keccak256` hash of its content.
# See: https://eips.ethereum.org/EIPS/eip-712#definition-of-encodedata.
local data_hashed=$(cast keccak "$data")
# Safe multisig versions `< 1.0.0` use a legacy (i.e. the parameter value `baseGas` was
# called `dataGas` previously) `SAFE_TX_TYPEHASH` value. Starting with version `1.0.0`,
# `baseGas` was introduced: https://github.com/safe-global/safe-smart-account/pull/90.
if [[ "$(printf "%s\n%s" "$clean_version" "1.0.0" | sort -V | head -n1)" == "$clean_version" && "$clean_version" != "1.0.0" ]]; then
safe_tx_typehash="$SAFE_TX_TYPEHASH_OLD"
fi
# Encode the message.
local message=$(cast abi-encode "SafeTxStruct(bytes32,address,uint256,bytes32,uint8,uint256,uint256,uint256,address,address,uint256)" \
"$safe_tx_typehash" \
"$to" \
"$value" \
"$data_hashed" \
"$operation" \
"$safe_tx_gas" \
"$base_gas" \
"$gas_price" \
"$gas_token" \
"$refund_receiver" \
"$nonce")
# Calculate the message hash.
local message_hash=$(cast keccak "$message")
# Calculate the Safe transaction hash.
local safe_tx_hash=$(chisel eval "keccak256(abi.encodePacked(bytes1(0x19), bytes1(0x01), bytes32($domain_hash), bytes32($message_hash)))" |
awk '/Data:/ {gsub(/\x1b\[[0-9;]*m/, "", $3); print $3}')
# Print the retrieved transaction data.
print_transaction_data "$address" "$to" "$value" "$data" "$operation" "$safe_tx_gas" "$base_gas" "$gas_price" "$gas_token" "$refund_receiver" "$nonce" "$message"
# Print the ABI-decoded transaction data.
print_decoded_data "$data" "$data_decoded"
# Print the results with the same formatting for "Domain hash" and "Message hash" as a Ledger hardware device.
print_hash_info "$domain_hash" "$message_hash" "$safe_tx_hash"
# Store the Safe transaction hash so it can be captured by a calling function.
if [[ -n "$update_global_safe_tx_hash" ]]; then
global_safe_tx_hash="$safe_tx_hash"
readonly global_safe_tx_hash
fi
}
# Utility function to calculate the domain and message hashes for a nested Safe multisig address.
calculate_nested_safe_hashes() {
local chain_id=$1
local target_safe_address=$2
local nested_safe_address=$3
local nested_safe_nonce=$4
local safe_tx_hash=$5
local nested_safe_version=$6
# Set the fixed parameters for the `approveHash` transaction.
local to="$target_safe_address"
local value="0"
# Encode the `approveHash(bytes32)` function call with the Safe transaction hash.
# See (`approveHash` function): https://github.com/safe-global/safe-smart-account/blob/bdcfce3a76c4d1dfb256ac2ca971be7cfd6e493a/contracts/Safe.sol#L372-L379.
# See (`execTransaction` function part): https://github.com/safe-global/safe-smart-account/blob/bdcfce3a76c4d1dfb256ac2ca971be7cfd6e493a/contracts/Safe.sol#L108-L143.
# See (`checkNSignatures` function part): https://github.com/safe-global/safe-smart-account/blob/bdcfce3a76c4d1dfb256ac2ca971be7cfd6e493a/contracts/Safe.sol#L318-L323.
# => `bytes4(keccak256("approveHash(bytes32)"));`
local approve_hash_signature="0xd4d9bdcd"
# => `abi.encodePacked(bytes4(keccak256("approveHash(bytes32)")), bytes32(safeTxHash));`
local data="${approve_hash_signature}${safe_tx_hash#0x}"
local operation="0"
local safe_tx_gas="0"
local base_gas="0"
local gas_price="0"
local gas_token="$ZERO_ADDRESS"
local refund_receiver="$ZERO_ADDRESS"
local nonce="$nested_safe_nonce"
local data_decoded="{\"method\": \"approveHash\", \"parameters\": [{\"name\": \"hashToApprove\", \"type\": \"bytes32\", \"value\": \"$safe_tx_hash\"}]}"
echo -e "\n${BOLD}${UNDERLINE}Nested Safe \`approveHash\` Transaction Data and Computed Hashes${RESET}"
cat <<EOF
$(tput setaf 3)The specified nested Safe at $nested_safe_address will use the following transaction to approve the primary transaction.$(tput sgr0)
EOF
# Calculate the domain and message hashes for the specified nested Safe multisig address.
calculate_hashes "$chain_id" \
"$nested_safe_address" \
"$to" \
"$value" \
"$data" \
"$operation" \
"$safe_tx_gas" \
"$base_gas" \
"$gas_price" \
"$gas_token" \
"$refund_receiver" \
"$nonce" \
"$data_decoded" \
"$nested_safe_version"
}
# Utility function to validate the network name.
validate_network() {
local network="$1"
if [[ -z "$network" ]]; then
echo -e "${BOLD}${RED}Network name is empty!${RESET}" >&2
echo
calculate_safe_hashes --list-networks >&2
exit 1
fi
if [[ -z "${API_URLS[$network]:-}" || -z "${CHAIN_IDS[$network]:-}" ]]; then
echo -e "${BOLD}${RED}Invalid network name: \"${network}\"${RESET}\n" >&2
echo
calculate_safe_hashes --list-networks >&2
exit 1
fi
}
# Utility function to retrieve the API URL of the selected network.
get_api_url() {
local network="$1"
validate_network "$network"
echo "${API_URLS[$network]}"
}
# Utility function to retrieve the chain ID of the selected network.
get_chain_id() {
local network="$1"
validate_network "$network"
echo "${CHAIN_IDS[$network]}"
}
# Utility function to validate the multisig address.
validate_address() {
local address="$1"
if [[ -z "$address" || ! "$address" =~ ^0x[a-fA-F0-9]{40}$ ]]; then
echo -e "${BOLD}${RED}Invalid Ethereum address format: \"${address}\"${RESET}" >&2
exit 1
fi
}
# Utility function to validate a value parameter.
validate_value() {
local value="$1"
local name="$2"
if [[ -z "$value" || ! "$value" =~ ^[0-9]+$ ]]; then
echo -e "${BOLD}${RED}Invalid \`${name}\` value: \"${value}\". Must be a non-negative integer!${RESET}" >&2
exit 1
fi
}
# Utility function to warn the user if the transaction includes an untrusted delegate call.
warn_if_delegate_call() {
local operation="$1"
local to="$2"
# Warn the user if `operation` equals `1`, implying a `delegatecall`, and if the `to` address is untrusted.
# See: https://github.com/safe-global/safe-smart-account/blob/34359e8305d618b7d74e39ed370a6b59ab14f827/contracts/libraries/Enum.sol.
if [[ "$operation" -eq 1 && ! " ${TRUSTED_FOR_DELEGATE_CALL[@]} " =~ " ${to} " ]]; then
cat <<EOF
$(tput setaf 1)WARNING: The transaction includes an untrusted delegate call to address $to!
This may lead to unexpected behaviour or vulnerabilities. Please review it carefully before you sign!$(tput sgr0)
EOF
delegate_call_warning_shown="true"
readonly delegate_call_warning_shown
fi
}
# Utility function to check for a potential gas token attack.
check_gas_token_attack() {
local gas_price=$1
local gas_token=$2
local refund_receiver=$3
local warning_message=""
if [[ "$gas_token" != "$ZERO_ADDRESS" && "$refund_receiver" != "$ZERO_ADDRESS" ]]; then
warning_message+="$(tput setaf 1)WARNING: This transaction uses a custom gas token and a custom refund receiver.
This combination can be used to hide a rerouting of funds through gas refunds.$(tput sgr0)\n"
if [[ "$gas_price" != "0" ]]; then
warning_message+="$(tput setaf 1)Furthermore, the gas price is non-zero, which increases the potential for hidden value transfers.$(tput sgr0)\n"
fi
elif [[ "$gas_token" != "$ZERO_ADDRESS" ]]; then
warning_message+="$(tput setaf 3)WARNING: This transaction uses a custom gas token. Please verify that this is intended.$(tput sgr0)\n"
elif [[ "$refund_receiver" != "$ZERO_ADDRESS" ]]; then
warning_message+="$(tput setaf 3)WARNING: This transaction uses a custom refund receiver. Please verify that this is intended.$(tput sgr0)\n"
fi
if [[ -n "$warning_message" ]]; then
if [[ "$delegate_call_warning_shown" != "true" ]]; then
echo -e "\n$warning_message"
else
echo -e "$warning_message"
fi
fi
}
# Utility function to validate the message file.
validate_message_file() {
local message_file="$1"
if [[ ! -f "$message_file" ]]; then
echo -e "${BOLD}${RED}Message file not found: \"${message_file}\"!${RESET}" >&2
exit 1
fi
if [[ ! -s "$message_file" ]]; then
echo -e "${BOLD}${RED}Message file is empty: \"${message_file}\"!${RESET}" >&2
exit 1
fi
}
# Utility function to calculate the domain and message hashes for off-chain messages.
calculate_offchain_message_hashes() {
local network=$1
local chain_id=$2
local address=$3
local message_file=$4
local version=$5
validate_message_file "$message_file"
# Validate the Safe multisig version.
validate_version "$version"
local message_raw=$(<"$message_file")
# Normalise line endings to `LF` (`\n`).
message_raw=$(echo "$message_raw" | tr -d "\r")
local hashed_message=$(cast hash-message "$message_raw")
local domain_separator_typehash="$DOMAIN_SEPARATOR_TYPEHASH"
local domain_hash_args="$domain_separator_typehash, $chain_id, $address"
# Calculate the domain hash.
local domain_hash=$(calculate_domain_hash "$version" "$domain_separator_typehash" "$domain_hash_args")
# Calculate the message hash.
local message_hash=$(chisel eval "keccak256(abi.encode(bytes32($SAFE_MSG_TYPEHASH), keccak256(abi.encode(bytes32($hashed_message)))))" |
awk '/Data:/ {gsub(/\x1b\[[0-9;]*m/, "", $3); print $3}')
# Calculate the Safe message hash.
local safe_msg_hash=$(chisel eval "keccak256(abi.encodePacked(bytes1(0x19), bytes1(0x01), bytes32($domain_hash), bytes32($message_hash)))" |
awk '/Data:/ {gsub(/\x1b\[[0-9;]*m/, "", $3); print $3}')
# Calculate and display the hashes.
echo "==================================="
echo "= Selected Network Configurations ="
echo -e "===================================\n"
print_field "Network" "$network"
print_field "Chain ID" "$chain_id" true
echo "===================================="
echo "= Message Data and Computed Hashes ="
echo "===================================="
print_header "Message Data"
print_field "Multisig address" "$address"
print_field "Message" "$message_raw"
print_header "Hashes"
print_field "Safe message" "$hashed_message"
print_field "Domain hash" "$(format_hash "$domain_hash")"
print_field "Message hash" "$(format_hash "$message_hash")"
print_field "Safe message hash" "$safe_msg_hash"
}
# Utility function to calculate the domain and message hashes for off-chain messages,
# using a nested Safe multisig address. Please note that off-chain messages are hashed
# and passed to a nested Safe via EIP-712 (https://eips.ethereum.org/EIPS/eip-712) objects.
calculate_nested_safe_offchain_message_hashes() {
local chain_id=$1
local address=$2
local nested_safe_address=$3
local message_file=$4
local nested_safe_version=$5
validate_message_file "$message_file"
# Validate the Safe multisig version.
validate_version "$nested_safe_version"
local message_raw=$(<"$message_file")
# Normalise line endings to `LF` (`\n`).
message_raw=$(echo "$message_raw" | tr -d "\r")
local hashed_message=$(cast hash-message "$message_raw")
local domain_separator_typehash="$DOMAIN_SEPARATOR_TYPEHASH"
local domain_hash_args="$domain_separator_typehash, $chain_id, $nested_safe_address"
# Calculate the Safe multisig domain hash.
local safe_domain_hash=$(calculate_domain_hash "$nested_safe_version" "$domain_separator_typehash" "$domain_hash_args")
# Calculate the EIP-712 message domain hash.
local message_domain_hash=$(chisel eval "keccak256(abi.encode(bytes32($domain_separator_typehash), uint256($chain_id), address($address)))" |
awk '/Data:/ {gsub(/\x1b\[[0-9;]*m/, "", $3); print $3}')
# Encode the message. Please note the value `hashed_message` is treated as a string and encoded
# as a `keccak256` hash of its content according to EIP-712 (https://eips.ethereum.org/EIPS/eip-712#definition-of-encodedata).
local message=$(cast abi-encode "SafeMessage(bytes32,bytes32)" "$SAFE_MSG_TYPEHASH" "$(cast keccak "$hashed_message")")
# Hash the message.
local hashed_encoded_message=$(cast keccak "$message")
# Calculate the Safe message.
local safe_msg=$(chisel eval "keccak256(abi.encodePacked(bytes1(0x19), bytes1(0x01), bytes32($message_domain_hash), bytes32($hashed_encoded_message)))" |
awk '/Data:/ {gsub(/\x1b\[[0-9;]*m/, "", $3); print $3}')
# Calculate the message hash.
local message_hash=$(chisel eval "keccak256(abi.encode(bytes32($SAFE_MSG_TYPEHASH), keccak256(abi.encode(bytes32($safe_msg)))))" |
awk '/Data:/ {gsub(/\x1b\[[0-9;]*m/, "", $3); print $3}')
# Calculate the Safe message hash.
local safe_msg_hash=$(chisel eval "keccak256(abi.encodePacked(bytes1(0x19), bytes1(0x01), bytes32($safe_domain_hash), bytes32($message_hash)))" |
awk '/Data:/ {gsub(/\x1b\[[0-9;]*m/, "", $3); print $3}')
echo -e "\n${BOLD}${UNDERLINE}Nested Safe Computed Hashes${RESET}"
cat <<EOF
$(tput setaf 3)The specified nested Safe at $nested_safe_address will sign the above displayed Safe message $hashed_message via an EIP-712 message object.$(tput sgr0)
EOF
# Calculate and display the hashes.
print_header "Hashes"
print_field "Safe message" "$safe_msg"
print_field "Domain hash" "$(format_hash "$safe_domain_hash")"
print_field "Message hash" "$(format_hash "$message_hash")"
print_field "Safe message hash" "$safe_msg_hash"
}
##############################################
# Safe Transaction/Message Hashes Calculator #
##############################################
# This function orchestrates the entire process of calculating the Safe transaction/message hashes:
# 1. Parses command-line arguments (`help`, `version`, `list-networks`, `network`, `address`, `nonce`,
# `nested-safe-address`, `nested-safe-nonce`, `message`, `interactive`).
# 2. Validates that all required parameters are provided.
# 3. Retrieves the API URL and chain ID for the specified network.
# 4. Constructs the API endpoint URL.
# 5. If a message file is provided:
# - Validates that no interactive mode is specified (as it's not applicable for off-chain message hashes).
# - Validates that no `nonce` or `nested-safe-nonce` is specified (as it's not applicable for off-chain message hashes).
# - Calls `calculate_offchain_message_hashes` to compute and display the message hashes.
# - If a nested Safe address is provided, invokes the `calculate_nested_safe_offchain_message_hashes` function with the nested
# parameter values and displays the resulting hashes.
# 6. If a `nonce` is provided:
# - Fetches the transaction data from the Safe transaction service API.
# - Extracts the relevant transaction details from the API response.
# - If the interactive mode is specified, overrides the desired parameter values.
# - Warns the user if the transaction includes an untrusted delegate call.
# - Checks for a potential gas token attack.
# - Calls the `calculate_hashes` function to compute and display the results.
# - If nested Safe parameters are provided, invokes the `calculate_nested_safe_hashes` function with the approval transaction
# data and displays the resulting hashes.
calculate_safe_hashes() {
# Display the help message if no arguments are provided.
if [[ $# -eq 0 ]]; then
usage
fi
# Initialise the CLI parameters.
local network=""
local address=""
local nonce=""
local nested_safe_address=""
local nested_safe_nonce=""
local message_file=""
local interactive=""
# Parse the command line arguments.
# Please note that `--help`, `--version`, and `--list-networks` can be used
# independently or alongside other options without causing the script to fail.
# They are special options that can be called without affecting the rest of
# the command processing.
while [[ $# -gt 0 ]]; do
case "$1" in
--help) usage 0 ;;
--version) get_latest_git_commit_hash ;;
--list-networks) list_networks ;;
--network)
network="$2"
shift 2
;;
--address)
address="$2"
shift 2
;;
--nonce)
nonce="$2"
shift 2
;;
--nested-safe-address)
nested_safe_address="$2"
shift 2
;;
--nested-safe-nonce)
nested_safe_nonce="$2"
shift 2
;;
--message)
message_file="$2"
shift 2
;;
--interactive)
interactive="1"
shift
;;
*)
echo "Unknown option: $1" >&2
usage
;;
esac
done
# Validate if the required parameters have the correct format.
validate_network "$network"
validate_address "$address"
# Get the API URL and chain ID for the specified network.
local api_url=$(get_api_url "$network")
local chain_id=$(get_chain_id "$network")
local endpoint="${api_url}/api/v2/safes/${address}/multisig-transactions/?nonce=${nonce}"
# Get the Safe multisig version.
local version=$(curl -sf "${api_url}/api/v1/safes/${address}/" | jq -r ".version // \"0.0.0\"" || echo "0.0.0")
# Validate the nested Safe address if provided.
local nested_safe_version=""
if [[ -n "$nested_safe_address" ]]; then
# Validate the nested Safe address.
validate_address "$nested_safe_address"
# Get the nested Safe multisig version.
nested_safe_version=$(curl -sf "${api_url}/api/v1/safes/${nested_safe_address}/" | jq -r ".version // \"0.0.0\"" || echo "0.0.0")
fi
# If --interactive mode is enabled, the version value can be overridden by the user's input.
if [[ -n "$interactive" ]]; then
cat <<EOF
Interactive mode is enabled. You will be prompted to enter values for parameters such as \`version\`, \`to\`, \`value\`, and others.
$(tput setaf 1)If it's not already obvious: This is YOLO mode – BE VERY CAREFUL!$(tput sgr0)
$(tput setaf 3)IMPORTANT:
- Leaving a parameter empty will use the value retrieved from the Safe transaction service API, displayed as the "default value".
If the value is unavailable (e.g. if the API endpoint is down), it will default to zero.
- If multiple transactions share the same nonce, the first transaction in the array will be selected to provide the default values.
- No warnings will be shown if multiple transactions share the same nonce. It's recommended to first run a validation without interactive mode enabled!
- Some parameters (e.g., \`version\`, \`to\`, \`operation\`) enforce valid options, but not all inputs are strictly validated.
Please double-check your entries before proceeding.$(tput sgr0)
EOF
read -rp "Enter the Safe multisig version (default: $version): " user_version
if [[ -n "$user_version" ]]; then
version="$user_version"
fi
validate_version $version
# If a nested Safe is used, allow overriding its version as well.
if [[ -n "$nested_safe_address" ]]; then
read -rp "Enter the nested Safe multisig version (default: $nested_safe_version): " user_nested_version
if [[ -n "$user_nested_version" ]]; then
nested_safe_version="$user_nested_version"
fi
validate_version $nested_safe_version
fi
fi
# Calculate the domain and message hashes for off-chain messages.
if [[ -n "$message_file" ]]; then
if [[ -n "$interactive" ]]; then
echo -e "${RED}Error: When calculating off-chain message hashes, do not specify the \`--interactive\` mode!${RESET}" >&2
exit 1
fi
if [[ -n "$nonce" ]]; then
echo -e "${RED}Error: When calculating off-chain message hashes, do not specify a nonce!${RESET}" >&2
exit 1
fi
calculate_offchain_message_hashes "$network" "$chain_id" "$address" "$message_file" "$version"
# If a nested Safe address is provided, calculate the domain and message hashes for off-chain messages
# using the nested Safe multisig address.
if [[ -n "$nested_safe_nonce" ]]; then
echo -e "${RED}Error: When calculating off-chain message hashes using a nested Safe, do not specify a nonce for the nested Safe!${RESET}" >&2
exit 1
elif [[ -n "$nested_safe_address" ]]; then
calculate_nested_safe_offchain_message_hashes "$chain_id" "$address" "$nested_safe_address" "$message_file" "$nested_safe_version"
fi
exit 0
fi
# Validate if the nonce parameter has the correct format.
# Please note that the nonce validation is intentionally placed
# after the domain and message hash calculations for off-chain
# messages, where a `nonce` (and `nested-safe-nonce`) is not required.
validate_value "$nonce" "nonce"
if [[ -n "$nested_safe_address" ]]; then
validate_value "$nested_safe_nonce" "nested-safe-nonce"
fi
# Fetch the transaction data from the API.
local response=$(curl -sf "$endpoint" || echo "{}")
# Set the default index value for the transaction array.
local idx=0
if [[ -z "$interactive" ]]; then
local count=$(echo "$response" | jq -r ".count // \"0\"")
# Inform the user that no transactions are available for the specified nonce.
if [[ $count -eq 0 ]]; then
echo "$(tput setaf 3)No transaction is available for this nonce!$(tput sgr0)"
exit 0
# Notify the user about multiple transactions with identical nonce values and prompt for user input.
elif [[ $count -gt 1 ]]; then
cat <<EOF
$(tput setaf 3)Several transactions with identical nonce values have been detected.
This occurrence is normal if you are deliberately replacing an existing transaction.
However, if your Safe interface displays only a single transaction, this could indicate
potential irregular activity requiring your attention.$(tput sgr0)
Kindly specify the transaction's array value (available range: 0-$((${count} - 1))).
You can find the array values at the following endpoint:
$(tput setaf 2)$endpoint$(tput sgr0)