879 lines
28 KiB
Markdown
879 lines
28 KiB
Markdown
Clef
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----
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Clef can be used to sign transactions and data and is meant as a replacement for geth's account management.
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This allows DApps not to depend on geth's account management. When a DApp wants to sign data it can send the data to
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the signer, the signer will then provide the user with context and asks the user for permission to sign the data. If
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the users grants the signing request the signer will send the signature back to the DApp.
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This setup allows a DApp to connect to a remote Ethereum node and send transactions that are locally signed. This can
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help in situations when a DApp is connected to a remote node because a local Ethereum node is not available, not
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synchronised with the chain or a particular Ethereum node that has no built-in (or limited) account management.
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Clef can run as a daemon on the same machine, or off a usb-stick like [usb armory](https://inversepath.com/usbarmory),
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or a separate VM in a [QubesOS](https://www.qubes-os.org/) type os setup.
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Check out
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* the [tutorial](tutorial.md) for some concrete examples on how the signer works.
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* the [setup docs](docs/setup.md) for some information on how to configure it to work on QubesOS or USBArmory.
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## Command line flags
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Clef accepts the following command line options:
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```
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COMMANDS:
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init Initialize the signer, generate secret storage
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attest Attest that a js-file is to be used
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addpw Store a credential for a keystore file
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help Shows a list of commands or help for one command
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GLOBAL OPTIONS:
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--loglevel value log level to emit to the screen (default: 4)
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--keystore value Directory for the keystore (default: "$HOME/.ethereum/keystore")
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--configdir value Directory for clef configuration (default: "$HOME/.clef")
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--networkid value Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, 4=Rinkeby) (default: 1)
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--lightkdf Reduce key-derivation RAM & CPU usage at some expense of KDF strength
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--nousb Disables monitoring for and managing USB hardware wallets
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--rpcaddr value HTTP-RPC server listening interface (default: "localhost")
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--rpcport value HTTP-RPC server listening port (default: 8550)
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--signersecret value A file containing the password used to encrypt signer credentials, e.g. keystore credentials and ruleset hash
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--4bytedb value File containing 4byte-identifiers (default: "./4byte.json")
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--4bytedb-custom value File used for writing new 4byte-identifiers submitted via API (default: "./4byte-custom.json")
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--auditlog value File used to emit audit logs. Set to "" to disable (default: "audit.log")
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--rules value Enable rule-engine (default: "rules.json")
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--stdio-ui Use STDIN/STDOUT as a channel for an external UI. This means that an STDIN/STDOUT is used for RPC-communication with a e.g. a graphical user interface, and can be used when the signer is started by an external process.
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--stdio-ui-test Mechanism to test interface between signer and UI. Requires 'stdio-ui'.
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--help, -h show help
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--version, -v print the version
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```
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Example:
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```
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signer -keystore /my/keystore -chainid 4
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```
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## Security model
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The security model of the signer is as follows:
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* One critical component (the signer binary / daemon) is responsible for handling cryptographic operations: signing, private keys, encryption/decryption of keystore files.
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* The signer binary has a well-defined 'external' API.
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* The 'external' API is considered UNTRUSTED.
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* The signer binary also communicates with whatever process that invoked the binary, via stdin/stdout.
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* This channel is considered 'trusted'. Over this channel, approvals and passwords are communicated.
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The general flow for signing a transaction using e.g. geth is as follows:
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In this case, `geth` would be started with `--externalsigner=http://localhost:8550` and would relay requests to `eth.sendTransaction`.
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## TODOs
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Some snags and todos
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* [ ] The signer should take a startup param "--no-change", for UIs that do not contain the capability
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to perform changes to things, only approve/deny. Such a UI should be able to start the signer in
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a more secure mode by telling it that it only wants approve/deny capabilities.
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* [x] It would be nice if the signer could collect new 4byte-id:s/method selectors, and have a
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secondary database for those (`4byte_custom.json`). Users could then (optionally) submit their collections for
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inclusion upstream.
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* It should be possible to configure the signer to check if an account is indeed known to it, before
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passing on to the UI. The reason it currently does not, is that it would make it possible to enumerate
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accounts if it immediately returned "unknown account".
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* [x] It should be possible to configure the signer to auto-allow listing (certain) accounts, instead of asking every time.
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* [x] Done Upon startup, the signer should spit out some info to the caller (particularly important when executed in `stdio-ui`-mode),
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invoking methods with the following info:
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* [x] Version info about the signer
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* [x] Address of API (http/ipc)
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* [ ] List of known accounts
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* [ ] Have a default timeout on signing operations, so that if the user has not answered within e.g. 60 seconds, the request is rejected.
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* [ ] `account_signRawTransaction`
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* [ ] `account_bulkSignTransactions([] transactions)` should
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* only exist if enabled via config/flag
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* only allow non-data-sending transactions
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* all txs must use the same `from`-account
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* let the user confirm, showing
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* the total amount
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* the number of unique recipients
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* Geth todos
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- The signer should pass the `Origin` header as call-info to the UI. As of right now, the way that info about the request is
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put together is a bit of a hack into the http server. This could probably be greatly improved
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- Relay: Geth should be started in `geth --external_signer localhost:8550`.
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- Currently, the Geth APIs use `common.Address` in the arguments to transaction submission (e.g `to` field). This
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type is 20 `bytes`, and is incapable of carrying checksum information. The signer uses `common.MixedcaseAddress`, which
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retains the original input.
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- The Geth api should switch to use the same type, and relay `to`-account verbatim to the external api.
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* [x] Storage
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* [x] An encrypted key-value storage should be implemented
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* See [rules.md](rules.md) for more info about this.
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* Another potential thing to introduce is pairing.
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* To prevent spurious requests which users just accept, implement a way to "pair" the caller with the signer (external API).
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* Thus geth/mist/cpp would cryptographically handshake and afterwards the caller would be allowed to make signing requests.
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* This feature would make the addition of rules less dangerous.
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* Wallets / accounts. Add API methods for wallets.
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## Communication
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### External API
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The signer listens to HTTP requests on `rpcaddr`:`rpcport`, with the same JSONRPC standard as Geth. The messages are
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expected to be JSON [jsonrpc 2.0 standard](http://www.jsonrpc.org/specification).
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Some of these call can require user interaction. Clients must be aware that responses
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may be delayed significantly or may never be received if a users decides to ignore the confirmation request.
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The External API is **untrusted** : it does not accept credentials over this api, nor does it expect
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that requests have any authority.
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### UI API
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The signer has one native console-based UI, for operation without any standalone tools.
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However, there is also an API to communicate with an external UI. To enable that UI,
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the signer needs to be executed with the `--stdio-ui` option, which allocates the
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`stdin`/`stdout` for the UI-api.
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An example (insecure) proof-of-concept of has been implemented in `pythonsigner.py`.
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The model is as follows:
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* The user starts the UI app (`pythonsigner.py`).
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* The UI app starts the `signer` with `--stdio-ui`, and listens to the
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process output for confirmation-requests.
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* The `signer` opens the external http api.
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* When the `signer` receives requests, it sends a `jsonrpc` request via `stdout`.
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* The UI app prompts the user accordingly, and responds to the `signer`
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* The `signer` signs (or not), and responds to the original request.
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## External API
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See the [external api changelog](extapi_changelog.md) for information about changes to this API.
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### Encoding
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- number: positive integers that are hex encoded
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- data: hex encoded data
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- string: ASCII string
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All hex encoded values must be prefixed with `0x`.
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## Methods
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### account_new
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#### Create new password protected account
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The signer will generate a new private key, encrypts it according to [web3 keystore spec](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) and stores it in the keystore directory.
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The client is responsible for creating a backup of the keystore. If the keystore is lost there is no method of retrieving lost accounts.
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#### Arguments
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None
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#### Result
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- address [string]: account address that is derived from the generated key
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- url [string]: location of the keyfile
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#### Sample call
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```json
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{
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"id": 0,
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"jsonrpc": "2.0",
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"method": "account_new",
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"params": []
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}
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{
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"id": 0,
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"jsonrpc": "2.0",
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"result": {
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"address": "0xbea9183f8f4f03d427f6bcea17388bdff1cab133",
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"url": "keystore:///my/keystore/UTC--2017-08-24T08-40-15.419655028Z--bea9183f8f4f03d427f6bcea17388bdff1cab133"
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}
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}
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```
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### account_list
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#### List available accounts
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List all accounts that this signer currently manages
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#### Arguments
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None
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#### Result
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- array with account records:
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- account.address [string]: account address that is derived from the generated key
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- account.type [string]: type of the
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- account.url [string]: location of the account
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#### Sample call
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```json
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{
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"id": 1,
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"jsonrpc": "2.0",
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"method": "account_list"
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}
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{
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"id": 1,
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"jsonrpc": "2.0",
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"result": [
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{
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"address": "0xafb2f771f58513609765698f65d3f2f0224a956f",
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"type": "account",
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"url": "keystore:///tmp/keystore/UTC--2017-08-24T07-26-47.162109726Z--afb2f771f58513609765698f65d3f2f0224a956f"
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},
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{
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"address": "0xbea9183f8f4f03d427f6bcea17388bdff1cab133",
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"type": "account",
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"url": "keystore:///tmp/keystore/UTC--2017-08-24T08-40-15.419655028Z--bea9183f8f4f03d427f6bcea17388bdff1cab133"
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}
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]
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}
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```
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### account_signTransaction
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#### Sign transactions
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Signs a transactions and responds with the signed transaction in RLP encoded form.
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#### Arguments
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2. transaction object:
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- `from` [address]: account to send the transaction from
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- `to` [address]: receiver account. If omitted or `0x`, will cause contract creation.
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- `gas` [number]: maximum amount of gas to burn
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- `gasPrice` [number]: gas price
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- `value` [number:optional]: amount of Wei to send with the transaction
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- `data` [data:optional]: input data
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- `nonce` [number]: account nonce
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3. method signature [string:optional]
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- The method signature, if present, is to aid decoding the calldata. Should consist of `methodname(paramtype,...)`, e.g. `transfer(uint256,address)`. The signer may use this data to parse the supplied calldata, and show the user. The data, however, is considered totally untrusted, and reliability is not expected.
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#### Result
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- signed transaction in RLP encoded form [data]
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#### Sample call
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```json
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{
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"id": 2,
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"jsonrpc": "2.0",
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"method": "account_signTransaction",
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"params": [
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{
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"from": "0x1923f626bb8dc025849e00f99c25fe2b2f7fb0db",
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"gas": "0x55555",
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"gasPrice": "0x1234",
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"input": "0xabcd",
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"nonce": "0x0",
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"to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
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"value": "0x1234"
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}
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]
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}
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```
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Response
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```json
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{
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"jsonrpc": "2.0",
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"id": 67,
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"error": {
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"code": -32000,
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"message": "Request denied"
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}
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}
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```
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#### Sample call with ABI-data
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```json
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{
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"jsonrpc": "2.0",
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"method": "account_signTransaction",
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"params": [
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{
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"from": "0x694267f14675d7e1b9494fd8d72fefe1755710fa",
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"gas": "0x333",
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"gasPrice": "0x1",
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"nonce": "0x0",
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"to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
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"value": "0x0",
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"data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"
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},
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"safeSend(address)"
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],
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"id": 67
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}
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```
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Response
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```json
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{
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"jsonrpc": "2.0",
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"id": 67,
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"result": {
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"raw": "0xf88380018203339407a565b7ed7d7a678680a4c162885bedbb695fe080a44401a6e4000000000000000000000000000000000000000000000000000000000000001226a0223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20ea02aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663",
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"tx": {
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"nonce": "0x0",
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"gasPrice": "0x1",
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"gas": "0x333",
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"to": "0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
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"value": "0x0",
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"input": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012",
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"v": "0x26",
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"r": "0x223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20e",
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"s": "0x2aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663",
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"hash": "0xeba2df809e7a612a0a0d444ccfa5c839624bdc00dd29e3340d46df3870f8a30e"
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}
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}
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}
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```
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Bash example:
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```bash
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#curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
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{"jsonrpc":"2.0","id":67,"result":{"raw":"0xf88380018203339407a565b7ed7d7a678680a4c162885bedbb695fe080a44401a6e4000000000000000000000000000000000000000000000000000000000000001226a0223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20ea02aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663","tx":{"nonce":"0x0","gasPrice":"0x1","gas":"0x333","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0","value":"0x0","input":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012","v":"0x26","r":"0x223a7c9bcf5531c99be5ea7082183816eb20cfe0bbc322e97cc5c7f71ab8b20e","s":"0x2aadee6b34b45bb15bc42d9c09de4a6754e7000908da72d48cc7704971491663","hash":"0xeba2df809e7a612a0a0d444ccfa5c839624bdc00dd29e3340d46df3870f8a30e"}}}
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```
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### account_sign
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#### Sign data
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Signs a chunk of data and returns the calculated signature.
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#### Arguments
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- account [address]: account to sign with
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- data [data]: data to sign
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#### Result
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- calculated signature [data]
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#### Sample call
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```json
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{
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"id": 3,
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"jsonrpc": "2.0",
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"method": "account_sign",
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"params": [
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"0x1923f626bb8dc025849e00f99c25fe2b2f7fb0db",
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"0xaabbccdd"
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]
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}
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```
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Response
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```json
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{
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"id": 3,
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"jsonrpc": "2.0",
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"result": "0x5b6693f153b48ec1c706ba4169960386dbaa6903e249cc79a8e6ddc434451d417e1e57327872c7f538beeb323c300afa9999a3d4a5de6caf3be0d5ef832b67ef1c"
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}
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```
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### account_ecRecover
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#### Recover address
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Derive the address from the account that was used to sign data from the data and signature.
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#### Arguments
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- data [data]: data that was signed
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- signature [data]: the signature to verify
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#### Result
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- derived account [address]
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#### Sample call
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```json
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{
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"id": 4,
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"jsonrpc": "2.0",
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"method": "account_ecRecover",
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"params": [
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"0xaabbccdd",
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"0x5b6693f153b48ec1c706ba4169960386dbaa6903e249cc79a8e6ddc434451d417e1e57327872c7f538beeb323c300afa9999a3d4a5de6caf3be0d5ef832b67ef1c"
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]
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}
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```
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Response
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```json
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{
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"id": 4,
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"jsonrpc": "2.0",
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"result": "0x1923f626bb8dc025849e00f99c25fe2b2f7fb0db"
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}
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```
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### account_import
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#### Import account
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Import a private key into the keystore. The imported key is expected to be encrypted according to the web3 keystore
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format.
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#### Arguments
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- account [object]: key in [web3 keystore format](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) (retrieved with account_export)
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#### Result
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- imported key [object]:
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- key.address [address]: address of the imported key
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- key.type [string]: type of the account
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- key.url [string]: key URL
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#### Sample call
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```json
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{
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"id": 6,
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"jsonrpc": "2.0",
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"method": "account_import",
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"params": [
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{
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"address": "c7412fc59930fd90099c917a50e5f11d0934b2f5",
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"crypto": {
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"cipher": "aes-128-ctr",
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"cipherparams": {
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"iv": "401c39a7c7af0388491c3d3ecb39f532"
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},
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"ciphertext": "eb045260b18dd35cd0e6d99ead52f8fa1e63a6b0af2d52a8de198e59ad783204",
|
|
"kdf": "scrypt",
|
|
"kdfparams": {
|
|
"dklen": 32,
|
|
"n": 262144,
|
|
"p": 1,
|
|
"r": 8,
|
|
"salt": "9a657e3618527c9b5580ded60c12092e5038922667b7b76b906496f021bb841a"
|
|
},
|
|
"mac": "880dc10bc06e9cec78eb9830aeb1e7a4a26b4c2c19615c94acb632992b952806"
|
|
},
|
|
"id": "09bccb61-b8d3-4e93-bf4f-205a8194f0b9",
|
|
"version": 3
|
|
},
|
|
]
|
|
}
|
|
```
|
|
Response
|
|
|
|
```json
|
|
{
|
|
"id": 6,
|
|
"jsonrpc": "2.0",
|
|
"result": {
|
|
"address": "0xc7412fc59930fd90099c917a50e5f11d0934b2f5",
|
|
"type": "account",
|
|
"url": "keystore:///tmp/keystore/UTC--2017-08-24T11-00-42.032024108Z--c7412fc59930fd90099c917a50e5f11d0934b2f5"
|
|
}
|
|
}
|
|
```
|
|
|
|
### account_export
|
|
|
|
#### Export account from keystore
|
|
Export a private key from the keystore. The exported private key is encrypted with the original passphrase. When the
|
|
key is imported later this passphrase is required.
|
|
|
|
#### Arguments
|
|
- account [address]: export private key that is associated with this account
|
|
|
|
#### Result
|
|
- exported key, see [web3 keystore format](https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition) for
|
|
more information
|
|
|
|
#### Sample call
|
|
```json
|
|
{
|
|
"id": 5,
|
|
"jsonrpc": "2.0",
|
|
"method": "account_export",
|
|
"params": [
|
|
"0xc7412fc59930fd90099c917a50e5f11d0934b2f5"
|
|
]
|
|
}
|
|
```
|
|
Response
|
|
|
|
```json
|
|
{
|
|
"id": 5,
|
|
"jsonrpc": "2.0",
|
|
"result": {
|
|
"address": "c7412fc59930fd90099c917a50e5f11d0934b2f5",
|
|
"crypto": {
|
|
"cipher": "aes-128-ctr",
|
|
"cipherparams": {
|
|
"iv": "401c39a7c7af0388491c3d3ecb39f532"
|
|
},
|
|
"ciphertext": "eb045260b18dd35cd0e6d99ead52f8fa1e63a6b0af2d52a8de198e59ad783204",
|
|
"kdf": "scrypt",
|
|
"kdfparams": {
|
|
"dklen": 32,
|
|
"n": 262144,
|
|
"p": 1,
|
|
"r": 8,
|
|
"salt": "9a657e3618527c9b5580ded60c12092e5038922667b7b76b906496f021bb841a"
|
|
},
|
|
"mac": "880dc10bc06e9cec78eb9830aeb1e7a4a26b4c2c19615c94acb632992b952806"
|
|
},
|
|
"id": "09bccb61-b8d3-4e93-bf4f-205a8194f0b9",
|
|
"version": 3
|
|
}
|
|
}
|
|
```
|
|
|
|
|
|
|
|
## UI API
|
|
|
|
These methods needs to be implemented by a UI listener.
|
|
|
|
By starting the signer with the switch `--stdio-ui-test`, the signer will invoke all known methods, and expect the UI to respond with
|
|
denials. This can be used during development to ensure that the API is (at least somewhat) correctly implemented.
|
|
See `pythonsigner`, which can be invoked via `python3 pythonsigner.py test` to perform the 'denial-handshake-test'.
|
|
|
|
All methods in this API uses object-based parameters, so that there can be no mixups of parameters: each piece of data is accessed by key.
|
|
|
|
See the [ui api changelog](intapi_changelog.md) for information about changes to this API.
|
|
|
|
OBS! A slight deviation from `json` standard is in place: every request and response should be confined to a single line.
|
|
Whereas the `json` specification allows for linebreaks, linebreaks __should not__ be used in this communication channel, to make
|
|
things simpler for both parties.
|
|
|
|
### ApproveTx
|
|
|
|
Invoked when there's a transaction for approval.
|
|
|
|
|
|
#### Sample call
|
|
|
|
Here's a method invocation:
|
|
```bash
|
|
|
|
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
|
|
```
|
|
|
|
```json
|
|
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 1,
|
|
"method": "ApproveTx",
|
|
"params": [
|
|
{
|
|
"transaction": {
|
|
"from": "0x0x694267f14675d7e1b9494fd8d72fefe1755710fa",
|
|
"to": "0x0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
|
|
"gas": "0x333",
|
|
"gasPrice": "0x1",
|
|
"value": "0x0",
|
|
"nonce": "0x0",
|
|
"data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012",
|
|
"input": null
|
|
},
|
|
"call_info": [
|
|
{
|
|
"type": "WARNING",
|
|
"message": "Invalid checksum on to-address"
|
|
},
|
|
{
|
|
"type": "Info",
|
|
"message": "safeSend(address: 0x0000000000000000000000000000000000000012)"
|
|
}
|
|
],
|
|
"meta": {
|
|
"remote": "127.0.0.1:48486",
|
|
"local": "localhost:8550",
|
|
"scheme": "HTTP/1.1"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
|
|
```
|
|
|
|
The same method invocation, but with invalid data:
|
|
```bash
|
|
|
|
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000002000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
|
|
```
|
|
|
|
```json
|
|
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 1,
|
|
"method": "ApproveTx",
|
|
"params": [
|
|
{
|
|
"transaction": {
|
|
"from": "0x0x694267f14675d7e1b9494fd8d72fefe1755710fa",
|
|
"to": "0x0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
|
|
"gas": "0x333",
|
|
"gasPrice": "0x1",
|
|
"value": "0x0",
|
|
"nonce": "0x0",
|
|
"data": "0x4401a6e40000000000000002000000000000000000000000000000000000000000000012",
|
|
"input": null
|
|
},
|
|
"call_info": [
|
|
{
|
|
"type": "WARNING",
|
|
"message": "Invalid checksum on to-address"
|
|
},
|
|
{
|
|
"type": "WARNING",
|
|
"message": "Transaction data did not match ABI-interface: WARNING: Supplied data is stuffed with extra data. \nWant 0000000000000002000000000000000000000000000000000000000000000012\nHave 0000000000000000000000000000000000000000000000000000000000000012\nfor method safeSend(address)"
|
|
}
|
|
],
|
|
"meta": {
|
|
"remote": "127.0.0.1:48492",
|
|
"local": "localhost:8550",
|
|
"scheme": "HTTP/1.1"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
|
|
|
|
```
|
|
|
|
One which has missing `to`, but with no `data`:
|
|
|
|
|
|
```json
|
|
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 3,
|
|
"method": "ApproveTx",
|
|
"params": [
|
|
{
|
|
"transaction": {
|
|
"from": "",
|
|
"to": null,
|
|
"gas": "0x0",
|
|
"gasPrice": "0x0",
|
|
"value": "0x0",
|
|
"nonce": "0x0",
|
|
"data": null,
|
|
"input": null
|
|
},
|
|
"call_info": [
|
|
{
|
|
"type": "CRITICAL",
|
|
"message": "Tx will create contract with empty code!"
|
|
}
|
|
],
|
|
"meta": {
|
|
"remote": "signer binary",
|
|
"local": "main",
|
|
"scheme": "in-proc"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
```
|
|
|
|
### ApproveExport
|
|
|
|
Invoked when a request to export an account has been made.
|
|
|
|
#### Sample call
|
|
|
|
```json
|
|
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 7,
|
|
"method": "ApproveExport",
|
|
"params": [
|
|
{
|
|
"address": "0x0000000000000000000000000000000000000000",
|
|
"meta": {
|
|
"remote": "signer binary",
|
|
"local": "main",
|
|
"scheme": "in-proc"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
|
|
```
|
|
|
|
### ApproveListing
|
|
|
|
Invoked when a request for account listing has been made.
|
|
|
|
#### Sample call
|
|
|
|
```json
|
|
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 5,
|
|
"method": "ApproveListing",
|
|
"params": [
|
|
{
|
|
"accounts": [
|
|
{
|
|
"type": "Account",
|
|
"url": "keystore:///home/bazonk/.ethereum/keystore/UTC--2017-11-20T14-44-54.089682944Z--123409812340981234098123409812deadbeef42",
|
|
"address": "0x123409812340981234098123409812deadbeef42"
|
|
},
|
|
{
|
|
"type": "Account",
|
|
"url": "keystore:///home/bazonk/.ethereum/keystore/UTC--2017-11-23T21-59-03.199240693Z--cafebabedeadbeef34098123409812deadbeef42",
|
|
"address": "0xcafebabedeadbeef34098123409812deadbeef42"
|
|
}
|
|
],
|
|
"meta": {
|
|
"remote": "signer binary",
|
|
"local": "main",
|
|
"scheme": "in-proc"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
|
|
```
|
|
|
|
|
|
### ApproveSignData
|
|
|
|
#### Sample call
|
|
|
|
```json
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 4,
|
|
"method": "ApproveSignData",
|
|
"params": [
|
|
{
|
|
"address": "0x123409812340981234098123409812deadbeef42",
|
|
"raw_data": "0x01020304",
|
|
"message": "\u0019Ethereum Signed Message:\n4\u0001\u0002\u0003\u0004",
|
|
"hash": "0x7e3a4e7a9d1744bc5c675c25e1234ca8ed9162bd17f78b9085e48047c15ac310",
|
|
"meta": {
|
|
"remote": "signer binary",
|
|
"local": "main",
|
|
"scheme": "in-proc"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
|
|
```
|
|
|
|
### ShowInfo
|
|
|
|
The UI should show the info to the user. Does not expect response.
|
|
|
|
#### Sample call
|
|
|
|
```json
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 9,
|
|
"method": "ShowInfo",
|
|
"params": [
|
|
{
|
|
"text": "Tests completed"
|
|
}
|
|
]
|
|
}
|
|
|
|
```
|
|
|
|
### ShowError
|
|
|
|
The UI should show the info to the user. Does not expect response.
|
|
|
|
```json
|
|
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 2,
|
|
"method": "ShowError",
|
|
"params": [
|
|
{
|
|
"text": "Testing 'ShowError'"
|
|
}
|
|
]
|
|
}
|
|
|
|
```
|
|
|
|
### OnApproved
|
|
|
|
`OnApprovedTx` is called when a transaction has been approved and signed. The call contains the return value that will be sent to the external caller. The return value from this method is ignored - the reason for having this callback is to allow the ruleset to keep track of approved transactions.
|
|
|
|
When implementing rate-limited rules, this callback should be used.
|
|
|
|
TLDR; Use this method to keep track of signed transactions, instead of using the data in `ApproveTx`.
|
|
|
|
### OnSignerStartup
|
|
|
|
This method provide the UI with information about what API version the signer uses (both internal and external) aswell as build-info and external api,
|
|
in k/v-form.
|
|
|
|
Example call:
|
|
```json
|
|
|
|
{
|
|
"jsonrpc": "2.0",
|
|
"id": 1,
|
|
"method": "OnSignerStartup",
|
|
"params": [
|
|
{
|
|
"info": {
|
|
"extapi_http": "http://localhost:8550",
|
|
"extapi_ipc": null,
|
|
"extapi_version": "2.0.0",
|
|
"intapi_version": "1.2.0"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
|
|
```
|
|
|
|
|
|
### Rules for UI apis
|
|
|
|
A UI should conform to the following rules.
|
|
|
|
* A UI MUST NOT load any external resources that were not embedded/part of the UI package.
|
|
* For example, not load icons, stylesheets from the internet
|
|
* Not load files from the filesystem, unless they reside in the same local directory (e.g. config files)
|
|
* A Graphical UI MUST show the blocky-identicon for ethereum addresses.
|
|
* A UI MUST warn display approproate warning if the destination-account is formatted with invalid checksum.
|
|
* A UI MUST NOT open any ports or services
|
|
* The signer opens the public port
|
|
* A UI SHOULD verify the permissions on the signer binary, and refuse to execute or warn if permissions allow non-user write.
|
|
* A UI SHOULD inform the user about the `SHA256` or `MD5` hash of the binary being executed
|
|
* A UI SHOULD NOT maintain a secondary storage of data, e.g. list of accounts
|
|
* The signer provides accounts
|
|
* A UI SHOULD, to the best extent possible, use static linking / bundling, so that required libraries are bundled
|
|
along with the UI.
|
|
|
|
|
|
### UI Implementations
|
|
|
|
There are a couple of implementation for a UI. We'll try to keep this list up to date.
|
|
|
|
| Name | Repo | UI type| No external resources| Blocky support| Verifies permissions | Hash information | No secondary storage | Statically linked| Can modify parameters|
|
|
| ---- | ---- | -------| ---- | ---- | ---- |---- | ---- | ---- | ---- |
|
|
| QtSigner| https://github.com/holiman/qtsigner/| Python3/QT-based| :+1:| :+1:| :+1:| :+1:| :+1:| :x: | :+1: (partially)|
|
|
| GtkSigner| https://github.com/holiman/gtksigner| Python3/GTK-based| :+1:| :x:| :x:| :+1:| :+1:| :x: | :x: |
|
|
| Frame | https://github.com/floating/frame/commits/go-signer| Electron-based| :x:| :x:| :x:| :x:| ?| :x: | :x: |
|
|
| Clef UI| https://github.com/kyokan/clef-ui| Golang/QT-based| :+1:| :+1:| :x:| :+1:| :+1:| :x: | :+1: (approve tx only)|
|