d3441ebb56
* signer: remove local path disclosure from extapi * signer: show more data in cli ui * rpc: make http server forward UA and Origin via Context * signer, clef/core: ui changes + display UA and Origin * signer: cliui - indicate less trust in remote headers, see https://github.com/ethereum/go-ethereum/issues/17637 * signer: prevent possibility swap KV-entries in aes_gcm storage, fixes #17635 * signer: remove ecrecover from external API * signer,clef: default reject instead of warn + valideate new passwords. fixes #17632 and #17631 * signer: check calldata length even if no ABI signature is present * signer: fix failing testcase * clef: remove account import from external api * signer: allow space in passwords, improve error messsage * signer/storage: fix typos
647 lines
19 KiB
Go
647 lines
19 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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// signer is a utility that can be used so sign transactions and
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// arbitrary data.
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package main
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import (
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"bufio"
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"context"
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"crypto/rand"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/signal"
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"os/user"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/ethereum/go-ethereum/cmd/utils"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/node"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/signer/core"
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"github.com/ethereum/go-ethereum/signer/rules"
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"github.com/ethereum/go-ethereum/signer/storage"
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"gopkg.in/urfave/cli.v1"
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)
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// ExternalAPIVersion -- see extapi_changelog.md
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const ExternalAPIVersion = "3.0.0"
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// InternalAPIVersion -- see intapi_changelog.md
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const InternalAPIVersion = "2.0.0"
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const legalWarning = `
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WARNING!
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Clef is alpha software, and not yet publically released. This software has _not_ been audited, and there
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are no guarantees about the workings of this software. It may contain severe flaws. You should not use this software
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unless you agree to take full responsibility for doing so, and know what you are doing.
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TLDR; THIS IS NOT PRODUCTION-READY SOFTWARE!
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`
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var (
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logLevelFlag = cli.IntFlag{
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Name: "loglevel",
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Value: 4,
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Usage: "log level to emit to the screen",
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}
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advancedMode = cli.BoolFlag{
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Name: "advanced",
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Usage: "If enabled, issues warnings instead of rejections for suspicious requests. Default off",
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}
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keystoreFlag = cli.StringFlag{
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Name: "keystore",
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Value: filepath.Join(node.DefaultDataDir(), "keystore"),
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Usage: "Directory for the keystore",
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}
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configdirFlag = cli.StringFlag{
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Name: "configdir",
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Value: DefaultConfigDir(),
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Usage: "Directory for Clef configuration",
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}
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rpcPortFlag = cli.IntFlag{
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Name: "rpcport",
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Usage: "HTTP-RPC server listening port",
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Value: node.DefaultHTTPPort + 5,
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}
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signerSecretFlag = cli.StringFlag{
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Name: "signersecret",
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Usage: "A file containing the password used to encrypt Clef credentials, e.g. keystore credentials and ruleset hash",
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}
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dBFlag = cli.StringFlag{
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Name: "4bytedb",
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Usage: "File containing 4byte-identifiers",
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Value: "./4byte.json",
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}
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customDBFlag = cli.StringFlag{
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Name: "4bytedb-custom",
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Usage: "File used for writing new 4byte-identifiers submitted via API",
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Value: "./4byte-custom.json",
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}
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auditLogFlag = cli.StringFlag{
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Name: "auditlog",
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Usage: "File used to emit audit logs. Set to \"\" to disable",
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Value: "audit.log",
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}
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ruleFlag = cli.StringFlag{
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Name: "rules",
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Usage: "Enable rule-engine",
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Value: "rules.json",
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}
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stdiouiFlag = cli.BoolFlag{
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Name: "stdio-ui",
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Usage: "Use STDIN/STDOUT as a channel for an external UI. " +
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"This means that an STDIN/STDOUT is used for RPC-communication with a e.g. a graphical user " +
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"interface, and can be used when Clef is started by an external process.",
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}
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testFlag = cli.BoolFlag{
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Name: "stdio-ui-test",
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Usage: "Mechanism to test interface between Clef and UI. Requires 'stdio-ui'.",
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}
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app = cli.NewApp()
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initCommand = cli.Command{
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Action: utils.MigrateFlags(initializeSecrets),
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Name: "init",
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Usage: "Initialize the signer, generate secret storage",
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ArgsUsage: "",
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Flags: []cli.Flag{
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logLevelFlag,
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configdirFlag,
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},
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Description: `
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The init command generates a master seed which Clef can use to store credentials and data needed for
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the rule-engine to work.`,
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}
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attestCommand = cli.Command{
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Action: utils.MigrateFlags(attestFile),
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Name: "attest",
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Usage: "Attest that a js-file is to be used",
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ArgsUsage: "<sha256sum>",
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Flags: []cli.Flag{
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logLevelFlag,
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configdirFlag,
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signerSecretFlag,
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},
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Description: `
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The attest command stores the sha256 of the rule.js-file that you want to use for automatic processing of
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incoming requests.
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Whenever you make an edit to the rule file, you need to use attestation to tell
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Clef that the file is 'safe' to execute.`,
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}
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addCredentialCommand = cli.Command{
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Action: utils.MigrateFlags(addCredential),
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Name: "addpw",
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Usage: "Store a credential for a keystore file",
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ArgsUsage: "<address> <password>",
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Flags: []cli.Flag{
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logLevelFlag,
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configdirFlag,
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signerSecretFlag,
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},
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Description: `
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The addpw command stores a password for a given address (keyfile). If you invoke it with only one parameter, it will
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remove any stored credential for that address (keyfile)
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`,
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}
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)
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func init() {
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app.Name = "Clef"
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app.Usage = "Manage Ethereum account operations"
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app.Flags = []cli.Flag{
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logLevelFlag,
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keystoreFlag,
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configdirFlag,
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utils.NetworkIdFlag,
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utils.LightKDFFlag,
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utils.NoUSBFlag,
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utils.RPCListenAddrFlag,
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utils.RPCVirtualHostsFlag,
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utils.IPCDisabledFlag,
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utils.IPCPathFlag,
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utils.RPCEnabledFlag,
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rpcPortFlag,
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signerSecretFlag,
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dBFlag,
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customDBFlag,
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auditLogFlag,
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ruleFlag,
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stdiouiFlag,
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testFlag,
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advancedMode,
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}
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app.Action = signer
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app.Commands = []cli.Command{initCommand, attestCommand, addCredentialCommand}
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}
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func main() {
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if err := app.Run(os.Args); err != nil {
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fmt.Fprintln(os.Stderr, err)
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os.Exit(1)
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}
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}
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func initializeSecrets(c *cli.Context) error {
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if err := initialize(c); err != nil {
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return err
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}
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configDir := c.String(configdirFlag.Name)
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masterSeed := make([]byte, 256)
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n, err := io.ReadFull(rand.Reader, masterSeed)
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if err != nil {
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return err
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}
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if n != len(masterSeed) {
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return fmt.Errorf("failed to read enough random")
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}
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err = os.Mkdir(configDir, 0700)
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if err != nil && !os.IsExist(err) {
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return err
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}
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location := filepath.Join(configDir, "secrets.dat")
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if _, err := os.Stat(location); err == nil {
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return fmt.Errorf("file %v already exists, will not overwrite", location)
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}
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err = ioutil.WriteFile(location, masterSeed, 0400)
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if err != nil {
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return err
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}
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fmt.Printf("A master seed has been generated into %s\n", location)
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fmt.Printf(`
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This is required to be able to store credentials, such as :
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* Passwords for keystores (used by rule engine)
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* Storage for javascript rules
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* Hash of rule-file
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You should treat that file with utmost secrecy, and make a backup of it.
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NOTE: This file does not contain your accounts. Those need to be backed up separately!
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`)
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return nil
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}
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func attestFile(ctx *cli.Context) error {
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if len(ctx.Args()) < 1 {
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utils.Fatalf("This command requires an argument.")
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}
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if err := initialize(ctx); err != nil {
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return err
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}
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stretchedKey, err := readMasterKey(ctx)
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if err != nil {
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utils.Fatalf(err.Error())
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}
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configDir := ctx.String(configdirFlag.Name)
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vaultLocation := filepath.Join(configDir, common.Bytes2Hex(crypto.Keccak256([]byte("vault"), stretchedKey)[:10]))
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confKey := crypto.Keccak256([]byte("config"), stretchedKey)
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// Initialize the encrypted storages
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configStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "config.json"), confKey)
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val := ctx.Args().First()
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configStorage.Put("ruleset_sha256", val)
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log.Info("Ruleset attestation updated", "sha256", val)
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return nil
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}
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func addCredential(ctx *cli.Context) error {
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if len(ctx.Args()) < 1 {
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utils.Fatalf("This command requires at leaste one argument.")
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}
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if err := initialize(ctx); err != nil {
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return err
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}
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stretchedKey, err := readMasterKey(ctx)
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if err != nil {
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utils.Fatalf(err.Error())
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}
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configDir := ctx.String(configdirFlag.Name)
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vaultLocation := filepath.Join(configDir, common.Bytes2Hex(crypto.Keccak256([]byte("vault"), stretchedKey)[:10]))
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pwkey := crypto.Keccak256([]byte("credentials"), stretchedKey)
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// Initialize the encrypted storages
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pwStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "credentials.json"), pwkey)
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key := ctx.Args().First()
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value := ""
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if len(ctx.Args()) > 1 {
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value = ctx.Args().Get(1)
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}
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pwStorage.Put(key, value)
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log.Info("Credential store updated", "key", key)
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return nil
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}
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func initialize(c *cli.Context) error {
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// Set up the logger to print everything
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logOutput := os.Stdout
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if c.Bool(stdiouiFlag.Name) {
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logOutput = os.Stderr
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// If using the stdioui, we can't do the 'confirm'-flow
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fmt.Fprintf(logOutput, legalWarning)
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} else {
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if !confirm(legalWarning) {
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return fmt.Errorf("aborted by user")
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}
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}
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log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(c.Int(logLevelFlag.Name)), log.StreamHandler(logOutput, log.TerminalFormat(true))))
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return nil
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}
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func signer(c *cli.Context) error {
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if err := initialize(c); err != nil {
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return err
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}
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var (
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ui core.SignerUI
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)
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if c.Bool(stdiouiFlag.Name) {
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log.Info("Using stdin/stdout as UI-channel")
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ui = core.NewStdIOUI()
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} else {
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log.Info("Using CLI as UI-channel")
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ui = core.NewCommandlineUI()
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}
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db, err := core.NewAbiDBFromFiles(c.String(dBFlag.Name), c.String(customDBFlag.Name))
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if err != nil {
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utils.Fatalf(err.Error())
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}
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log.Info("Loaded 4byte db", "signatures", db.Size(), "file", c.String("4bytedb"))
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var (
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api core.ExternalAPI
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)
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configDir := c.String(configdirFlag.Name)
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if stretchedKey, err := readMasterKey(c); err != nil {
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log.Info("No master seed provided, rules disabled")
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} else {
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if err != nil {
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utils.Fatalf(err.Error())
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}
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vaultLocation := filepath.Join(configDir, common.Bytes2Hex(crypto.Keccak256([]byte("vault"), stretchedKey)[:10]))
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// Generate domain specific keys
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pwkey := crypto.Keccak256([]byte("credentials"), stretchedKey)
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jskey := crypto.Keccak256([]byte("jsstorage"), stretchedKey)
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confkey := crypto.Keccak256([]byte("config"), stretchedKey)
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// Initialize the encrypted storages
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pwStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "credentials.json"), pwkey)
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jsStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "jsstorage.json"), jskey)
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configStorage := storage.NewAESEncryptedStorage(filepath.Join(vaultLocation, "config.json"), confkey)
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//Do we have a rule-file?
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ruleJS, err := ioutil.ReadFile(c.String(ruleFlag.Name))
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if err != nil {
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log.Info("Could not load rulefile, rules not enabled", "file", "rulefile")
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} else {
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hasher := sha256.New()
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hasher.Write(ruleJS)
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shasum := hasher.Sum(nil)
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storedShasum := configStorage.Get("ruleset_sha256")
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if storedShasum != hex.EncodeToString(shasum) {
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log.Info("Could not validate ruleset hash, rules not enabled", "got", hex.EncodeToString(shasum), "expected", storedShasum)
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} else {
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// Initialize rules
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ruleEngine, err := rules.NewRuleEvaluator(ui, jsStorage, pwStorage)
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if err != nil {
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utils.Fatalf(err.Error())
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}
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ruleEngine.Init(string(ruleJS))
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ui = ruleEngine
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log.Info("Rule engine configured", "file", c.String(ruleFlag.Name))
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}
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}
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}
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apiImpl := core.NewSignerAPI(
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c.Int64(utils.NetworkIdFlag.Name),
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c.String(keystoreFlag.Name),
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c.Bool(utils.NoUSBFlag.Name),
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ui, db,
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c.Bool(utils.LightKDFFlag.Name),
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c.Bool(advancedMode.Name))
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api = apiImpl
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// Audit logging
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if logfile := c.String(auditLogFlag.Name); logfile != "" {
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api, err = core.NewAuditLogger(logfile, api)
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if err != nil {
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utils.Fatalf(err.Error())
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}
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log.Info("Audit logs configured", "file", logfile)
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}
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// register signer API with server
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var (
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extapiURL = "n/a"
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ipcapiURL = "n/a"
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)
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rpcAPI := []rpc.API{
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{
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Namespace: "account",
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Public: true,
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Service: api,
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Version: "1.0"},
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}
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if c.Bool(utils.RPCEnabledFlag.Name) {
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vhosts := splitAndTrim(c.GlobalString(utils.RPCVirtualHostsFlag.Name))
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cors := splitAndTrim(c.GlobalString(utils.RPCCORSDomainFlag.Name))
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// start http server
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httpEndpoint := fmt.Sprintf("%s:%d", c.String(utils.RPCListenAddrFlag.Name), c.Int(rpcPortFlag.Name))
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listener, _, err := rpc.StartHTTPEndpoint(httpEndpoint, rpcAPI, []string{"account"}, cors, vhosts, rpc.DefaultHTTPTimeouts)
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if err != nil {
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utils.Fatalf("Could not start RPC api: %v", err)
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}
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extapiURL = fmt.Sprintf("http://%s", httpEndpoint)
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log.Info("HTTP endpoint opened", "url", extapiURL)
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defer func() {
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listener.Close()
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log.Info("HTTP endpoint closed", "url", httpEndpoint)
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}()
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}
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if !c.Bool(utils.IPCDisabledFlag.Name) {
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if c.IsSet(utils.IPCPathFlag.Name) {
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ipcapiURL = c.String(utils.IPCPathFlag.Name)
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} else {
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ipcapiURL = filepath.Join(configDir, "clef.ipc")
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}
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listener, _, err := rpc.StartIPCEndpoint(ipcapiURL, rpcAPI)
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if err != nil {
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utils.Fatalf("Could not start IPC api: %v", err)
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}
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log.Info("IPC endpoint opened", "url", ipcapiURL)
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defer func() {
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listener.Close()
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log.Info("IPC endpoint closed", "url", ipcapiURL)
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}()
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}
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if c.Bool(testFlag.Name) {
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log.Info("Performing UI test")
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go testExternalUI(apiImpl)
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}
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ui.OnSignerStartup(core.StartupInfo{
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Info: map[string]interface{}{
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"extapi_version": ExternalAPIVersion,
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"intapi_version": InternalAPIVersion,
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"extapi_http": extapiURL,
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"extapi_ipc": ipcapiURL,
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},
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})
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abortChan := make(chan os.Signal)
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signal.Notify(abortChan, os.Interrupt)
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sig := <-abortChan
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log.Info("Exiting...", "signal", sig)
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return nil
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}
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|
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// splitAndTrim splits input separated by a comma
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// and trims excessive white space from the substrings.
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func splitAndTrim(input string) []string {
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result := strings.Split(input, ",")
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for i, r := range result {
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result[i] = strings.TrimSpace(r)
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}
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return result
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}
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|
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// DefaultConfigDir is the default config directory to use for the vaults and other
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// persistence requirements.
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func DefaultConfigDir() string {
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// Try to place the data folder in the user's home dir
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home := homeDir()
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if home != "" {
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if runtime.GOOS == "darwin" {
|
|
return filepath.Join(home, "Library", "Signer")
|
|
} else if runtime.GOOS == "windows" {
|
|
return filepath.Join(home, "AppData", "Roaming", "Signer")
|
|
} else {
|
|
return filepath.Join(home, ".clef")
|
|
}
|
|
}
|
|
// As we cannot guess a stable location, return empty and handle later
|
|
return ""
|
|
}
|
|
|
|
func homeDir() string {
|
|
if home := os.Getenv("HOME"); home != "" {
|
|
return home
|
|
}
|
|
if usr, err := user.Current(); err == nil {
|
|
return usr.HomeDir
|
|
}
|
|
return ""
|
|
}
|
|
func readMasterKey(ctx *cli.Context) ([]byte, error) {
|
|
var (
|
|
file string
|
|
configDir = ctx.String(configdirFlag.Name)
|
|
)
|
|
if ctx.IsSet(signerSecretFlag.Name) {
|
|
file = ctx.String(signerSecretFlag.Name)
|
|
} else {
|
|
file = filepath.Join(configDir, "secrets.dat")
|
|
}
|
|
if err := checkFile(file); err != nil {
|
|
return nil, err
|
|
}
|
|
masterKey, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(masterKey) < 256 {
|
|
return nil, fmt.Errorf("master key of insufficient length, expected >255 bytes, got %d", len(masterKey))
|
|
}
|
|
// Create vault location
|
|
vaultLocation := filepath.Join(configDir, common.Bytes2Hex(crypto.Keccak256([]byte("vault"), masterKey)[:10]))
|
|
err = os.Mkdir(vaultLocation, 0700)
|
|
if err != nil && !os.IsExist(err) {
|
|
return nil, err
|
|
}
|
|
//!TODO, use KDF to stretch the master key
|
|
// stretched_key := stretch_key(master_key)
|
|
|
|
return masterKey, nil
|
|
}
|
|
|
|
// checkFile is a convenience function to check if a file
|
|
// * exists
|
|
// * is mode 0400
|
|
func checkFile(filename string) error {
|
|
info, err := os.Stat(filename)
|
|
if err != nil {
|
|
return fmt.Errorf("failed stat on %s: %v", filename, err)
|
|
}
|
|
// Check the unix permission bits
|
|
if info.Mode().Perm()&0377 != 0 {
|
|
return fmt.Errorf("file (%v) has insecure file permissions (%v)", filename, info.Mode().String())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// confirm displays a text and asks for user confirmation
|
|
func confirm(text string) bool {
|
|
fmt.Printf(text)
|
|
fmt.Printf("\nEnter 'ok' to proceed:\n>")
|
|
|
|
text, err := bufio.NewReader(os.Stdin).ReadString('\n')
|
|
if err != nil {
|
|
log.Crit("Failed to read user input", "err", err)
|
|
}
|
|
|
|
if text := strings.TrimSpace(text); text == "ok" {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func testExternalUI(api *core.SignerAPI) {
|
|
|
|
ctx := context.WithValue(context.Background(), "remote", "clef binary")
|
|
ctx = context.WithValue(ctx, "scheme", "in-proc")
|
|
ctx = context.WithValue(ctx, "local", "main")
|
|
|
|
errs := make([]string, 0)
|
|
|
|
api.UI.ShowInfo("Testing 'ShowInfo'")
|
|
api.UI.ShowError("Testing 'ShowError'")
|
|
|
|
checkErr := func(method string, err error) {
|
|
if err != nil && err != core.ErrRequestDenied {
|
|
errs = append(errs, fmt.Sprintf("%v: %v", method, err.Error()))
|
|
}
|
|
}
|
|
var err error
|
|
|
|
_, err = api.SignTransaction(ctx, core.SendTxArgs{From: common.MixedcaseAddress{}}, nil)
|
|
checkErr("SignTransaction", err)
|
|
_, err = api.Sign(ctx, common.MixedcaseAddress{}, common.Hex2Bytes("01020304"))
|
|
checkErr("Sign", err)
|
|
_, err = api.List(ctx)
|
|
checkErr("List", err)
|
|
_, err = api.New(ctx)
|
|
checkErr("New", err)
|
|
_, err = api.Export(ctx, common.Address{})
|
|
checkErr("Export", err)
|
|
_, err = api.Import(ctx, json.RawMessage{})
|
|
checkErr("Import", err)
|
|
|
|
api.UI.ShowInfo("Tests completed")
|
|
|
|
if len(errs) > 0 {
|
|
log.Error("Got errors")
|
|
for _, e := range errs {
|
|
log.Error(e)
|
|
}
|
|
} else {
|
|
log.Info("No errors")
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
//Create Account
|
|
|
|
curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_new","params":["test"],"id":67}' localhost:8550
|
|
|
|
// List accounts
|
|
|
|
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_list","params":[""],"id":67}' http://localhost:8550/
|
|
|
|
// Make Transaction
|
|
// safeSend(0x12)
|
|
// 4401a6e40000000000000000000000000000000000000000000000000000000000000012
|
|
|
|
// supplied abi
|
|
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x82A2A876D39022B3019932D30Cd9c97ad5616813","gas":"0x333","gasPrice":"0x123","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x10", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"test"],"id":67}' http://localhost:8550/
|
|
|
|
// Not supplied
|
|
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x82A2A876D39022B3019932D30Cd9c97ad5616813","gas":"0x333","gasPrice":"0x123","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x10", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"}],"id":67}' http://localhost:8550/
|
|
|
|
// Sign data
|
|
|
|
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_sign","params":["0x694267f14675d7e1b9494fd8d72fefe1755710fa","bazonk gaz baz"],"id":67}' http://localhost:8550/
|
|
|
|
|
|
**/
|