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#66 in Cryptography
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This repository contains
tmkms, a key management service intended to be deployed
in conjunction with Tendermint applications (ideally on separate physical hosts)
which provides the following:
- High-availability access to validator signing keys
- Double-signing prevention even in the event the validator process is compromised
- Hardware security module storage for validator keys which can survive host compromise
Tendermint KMS is currently beta quality. It has undergone one security audit with only one low-severity finding.
Tendermint KMS implements beta quality double signing detection. It has undergone some testing, however we do not (yet) recommend using the KMS in conjunction with multiple simultaneously active validators on the same network for prolonged periods of time.
In particular, there is presently no double signing defense in the case that multiple KMS instances are running simultaneously and connecting to multiple validators on the same network.
You MUST select one or more signing provider(s) when compiling the KMS,
passed as the argument to the
--features flag (see below for more
instructions on how to build Tendermint KMS).
The following signing backend providers are presently supported:
- YubiHSM2 (gated under the
yubihsmcargo feature. See README.yubihsm.md for more info)
- Ledger (gated under the
softsignbackend which uses ed25519-dalek
tmkms should build on any supported Rust platform which is also supported
by libusb, however there are some platforms which meet those criteria which
are unsuitable for cryptography purposes due to lack of constant-time CPU
instructions. Below are some of the available tier 1, 2, and 3 Rust platforms
which meet our minimum criteria for KMS use.
tmkms is presently tested on Linux/x86_64. We don't otherwise guarantee
support for any of the platforms below, but they theoretically meet the necessary
prerequisites for support.
- Linux (recommended)
You will need the following prerequisites:
- Rust (stable; 1.41+): https://rustup.rs/
- C compiler: e.g. gcc, clang
- libusb (1.0+). Install instructions for common platforms:
apt install libusb-1.0-0-dev
yum install libusb1-devel
- macOS (Homebrew):
brew install libusb
NOTE (x86_64 only): Configure
RUSTFLAGS environment variable:
There are two ways to install
tmkms: either compiling the source code after
cloning it from git, or using Rust's
cargo install command.
tmkms can be compiled directly from the git repository source code using the
The following example adds
--features=yubihsm to enable YubiHSM 2 support.
$ git clone https://github.com/iqlusioninc/tmkms.git && cd tmkms [...] $ cargo build --release --features=yubihsm
--features=ledgertm to enable Ledger support.
If successful, this will produce a
tmkms executable located at
With Rust (1.44+) installed, you can install tmkms with the following:
cargo install tmkms --features=yubihsm
Or to install a specific version (recommended):
cargo install tmkms --features=yubihsm --version=0.4.0
--features=ledgertm to enable Ledger support.
tmkms init command can be used to generate a directory containing
the configuration files needed to run the KMS. Run the following:
$ tmkms init /path/to/kms/home
This will output a
tmkms.toml file, a
kms-identity.key (used to authenticate
the KMS to the validator), and create
Please look through
tmkms.toml after it's generated, as various sections
will require some customization.
tmkms init command also accepts a
--networks argument which can
be used to specify certain well-known Tendermint chains to initialize:
$ tmkms init -n cosmoshub,irishub,columbus /path/to/kms/home
After creading the configuration, start
tmkms with the following:
$ tmkms start
This will read the configuration from the
tmkms.toml file in the current
To explicitly specify the path to the configuration, use the
$ tmkms start -c /path/to/tmkms.toml
The following are instructions for setting up a development environment. They assume you've already followed steps 1 & 2 from the Installation section above.
- Install rustfmt:
rustup component add rustfmt
- Install clippy:
rustup component add clippy
Alternatively, you can build a Docker image from the Dockerfile in the top level of the repository, which is what is used to run tests in CI.
Before opening a pull request, please run the checks below:
Run the test suite with:
cargo test --all-features -- --test-threads 1
Make sure your code is well-formatted by running:
Lint your code (i.e. check it for common issues) with:
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.