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clef: documentation generator + docs (#19020) 

* clef: implement documentation generation + remove unused struct

* clef: formatting + spelling

* clef: updates to doc
This commit is contained in:
Martin Holst Swende 2019-02-13 21:37:59 +01:00 committed by GitHub
parent 3fd6db2bf6
commit e9f70c9064
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25
cmd/clef/README.md
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@ -16,7 +16,8 @@ Check out
* the [tutorial](tutorial.md) for some concrete examples on how the signer works.
* the [setup docs](docs/setup.md) for some information on how to configure it to work on QubesOS or USBArmory.
* the [data types](datatypes.md) for detailed information on the json types used in the communication between
clef and an external UI
## Command line flags
Clef accepts the following command line options:
@ -24,28 +25,34 @@ Clef accepts the following command line options:
COMMANDS:
init Initialize the signer, generate secret storage
attest Attest that a js-file is to be used
addpw Store a credential for a keystore file
setpw Store a credential for a keystore file
gendoc Generate documentation about json-rpc format
help Shows a list of commands or help for one command
GLOBAL OPTIONS:
--loglevel value log level to emit to the screen (default: 4)
--keystore value Directory for the keystore (default: "$HOME/.ethereum/keystore")
--configdir value Directory for clef configuration (default: "$HOME/.clef")
--networkid value Network identifier (integer, 1=Frontier, 2=Morden (disused), 3=Ropsten, 4=Rinkeby) (default: 1)
--configdir value Directory for Clef configuration (default: "$HOME/.clef")
--chainid value Chain id to use for signing (1=mainnet, 3=ropsten, 4=rinkeby, 5=Goerli) (default: 1)
--lightkdf Reduce key-derivation RAM & CPU usage at some expense of KDF strength
--nousb Disables monitoring for and managing USB hardware wallets
--rpcaddr value HTTP-RPC server listening interface (default: "localhost")
--rpcvhosts value Comma separated list of virtual hostnames from which to accept requests (server enforced). Accepts '*' wildcard. (default: "localhost")
--ipcdisable Disable the IPC-RPC server
--ipcpath Filename for IPC socket/pipe within the datadir (explicit paths escape it)
--rpc Enable the HTTP-RPC server
--rpcport value HTTP-RPC server listening port (default: 8550)
--signersecret value A file containing the password used to encrypt signer credentials, e.g. keystore credentials and ruleset hash
--signersecret value A file containing the (encrypted) master seed to encrypt Clef data, e.g. keystore credentials and ruleset hash
--4bytedb value File containing 4byte-identifiers (default: "./4byte.json")
--4bytedb-custom value File used for writing new 4byte-identifiers submitted via API (default: "./4byte-custom.json")
--auditlog value File used to emit audit logs. Set to "" to disable (default: "audit.log")
--rules value Enable rule-engine (default: "rules.json")
--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.
--stdio-ui-test Mechanism to test interface between signer and UI. Requires 'stdio-ui'.
--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 Clef is started by an external process.
--stdio-ui-test Mechanism to test interface between Clef and UI. Requires 'stdio-ui'.
--advanced If enabled, issues warnings instead of rejections for suspicious requests. Default off
--help, -h show help
--version, -v print the version
```

219
cmd/clef/datatypes.md Normal file
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@ -0,0 +1,219 @@
## UI Client interface
These data types are defined in the channel between clef and the UI
### SignDataRequest
SignDataRequest contains information about a pending request to sign some data. The data to be signed can be of various types, defined by content-type. Clef has done most of the work in canonicalizing and making sense of the data, and it's up to the UI to presentthe user with the contents of the `message`
Example:
```json
{
"content_type": "text/plain",
"address": "0xDEADbEeF000000000000000000000000DeaDbeEf",
"raw_data": "GUV0aGVyZXVtIFNpZ25lZCBNZXNzYWdlOgoxMWhlbGxvIHdvcmxk",
"message": [
{
"name": "message",
"value": "\u0019Ethereum Signed Message:\n11hello world",
"type": "text/plain"
}
],
"hash": "0xd9eba16ed0ecae432b71fe008c98cc872bb4cc214d3220a36f365326cf807d68",
"meta": {
"remote": "localhost:9999",
"local": "localhost:8545",
"scheme": "http",
"User-Agent": "Firefox 3.2",
"Origin": "www.malicious.ru"
}
}
```
### SignDataResponse - approve
Response to SignDataRequest
Example:
```json
{
"approved": true,
"Password": "apassword"
}
```
### SignDataResponse - deny
Response to SignDataRequest
Example:
```json
{
"approved": false,
"Password": ""
}
```
### SignTxRequest
SignTxRequest contains information about a pending request to sign a transaction. Aside from the transaction itself, there is also a `call_info`-struct. That struct contains messages of various types, that the user should be informed of.
As in any request, it's important to consider that the `meta` info also contains untrusted data.
The `transaction` (on input into clef) can have either `data` or `input` -- if both are set, they must be identical, otherwise an error is generated. However, Clef will always use `data` when passing this struct on (if Clef does otherwise, please file a ticket)
Example:
```json
{
"transaction": {
"from": "0xDEADbEeF000000000000000000000000DeaDbeEf",
"to": null,
"gas": "0x3e8",
"gasPrice": "0x5",
"value": "0x6",
"nonce": "0x1",
"data": "0x01020304"
},
"call_info": [
{
"type": "Warning",
"message": "Something looks odd, show this message as a warning"
},
{
"type": "Info",
"message": "User should see this aswell"
}
],
"meta": {
"remote": "localhost:9999",
"local": "localhost:8545",
"scheme": "http",
"User-Agent": "Firefox 3.2",
"Origin": "www.malicious.ru"
}
}
```
### SignDataResponse - approve
Response to SignDataRequest. This response needs to contain the `transaction`, because the UI is free to make modifications to the transaction.
Example:
```json
{
"transaction": {
"from": "0xDEADbEeF000000000000000000000000DeaDbeEf",
"to": null,
"gas": "0x3e8",
"gasPrice": "0x5",
"value": "0x6",
"nonce": "0x4",
"data": "0x04030201"
},
"approved": true,
"password": "apassword"
}
```
### SignDataResponse - deny
Response to SignDataRequest. When denying a request, there's no need to provide the transaction in return
Example:
```json
{
"approved": false,
"Password": ""
}
```
### OnApproved - SignTransactionResult
SignTransactionResult is used in the call `clef` -> `OnApprovedTx(result)`
This occurs _after_ successful completion of the entire signing procedure, but right before the signed transaction is passed to the external caller. This method (and data) can be used by the UI to signal to the user that the transaction was signed, but it is primarily useful for ruleset implementations.
A ruleset that implements a rate limitation needs to know what transactions are sent out to the external interface. By hooking into this methods, the ruleset can maintain track of that count.
**OBS:** Note that if an attacker can restore your `clef` data to a previous point in time (e.g through a backup), the attacker can reset such windows, even if he/she is unable to decrypt the content.
The `OnApproved` method cannot be responded to, it's purely informative
Example:
```json
{
"raw": "0xf85d640101948a8eafb1cf62bfbeb1741769dae1a9dd47996192018026a0716bd90515acb1e68e5ac5867aa11a1e65399c3349d479f5fb698554ebc6f293a04e8a4ebfff434e971e0ef12c5bf3a881b06fd04fc3f8b8a7291fb67a26a1d4ed",
"tx": {
"nonce": "0x64",
"gasPrice": "0x1",
"gas": "0x1",
"to": "0x8a8eafb1cf62bfbeb1741769dae1a9dd47996192",
"value": "0x1",
"input": "0x",
"v": "0x26",
"r": "0x716bd90515acb1e68e5ac5867aa11a1e65399c3349d479f5fb698554ebc6f293",
"s": "0x4e8a4ebfff434e971e0ef12c5bf3a881b06fd04fc3f8b8a7291fb67a26a1d4ed",
"hash": "0x662f6d772692dd692f1b5e8baa77a9ff95bbd909362df3fc3d301aafebde5441"
}
}
```
### UserInputRequest
Sent when clef needs the user to provide data. If 'password' is true, the input field should be treated accordingly (echo-free)
Example:
```json
{
"prompt": "The question to ask the user",
"title": "The title here",
"isPassword": true
}
```
### UserInputResponse
Response to SignDataRequest
Example:
```json
{
"text": "The textual response from user"
}
```
### ListRequest
Sent when a request has been made to list addresses. The UI is provided with the full `account`s, including local directory names. Note: this information is not passed back to the external caller, who only sees the `address`es.
Example:
```json
{
"accounts": [
{
"address": "0xdeadbeef000000000000000000000000deadbeef",
"url": "keystore:///path/to/keyfile/a"
},
{
"address": "0x1111111122222222222233333333334444444444",
"url": "keystore:///path/to/keyfile/b"
}
],
"meta": {
"remote": "localhost:9999",
"local": "localhost:8545",
"scheme": "http",
"User-Agent": "Firefox 3.2",
"Origin": "www.malicious.ru"
}
}
```
### UserInputResponse
Response to list request. The response contains a list of all addresses to show to the caller. Note: the UI is free to respond with any address the caller, regardless of whether it exists or not
Example:
```json
{
"accounts": [
{
"address": "0x0000000000000000000000000000000000000000",
"url": ".. ignored .."
},
{
"address": "0xffffffffffffffffffffffffffffffffffffffff",
"url": ""
}
]
}
```

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165
cmd/clef/main.go
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@ -36,12 +36,15 @@ import (
"runtime"
"strings"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/console"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/params"
@ -171,10 +174,16 @@ Clef that the file is 'safe' to execute.`,
signerSecretFlag,
},
Description: `
The setpw command stores a password for a given address (keyfile). If you enter a blank passphrase, it will
The setpw command stores a password for a given address (keyfile). If you enter a blank passphrase, it will
remove any stored credential for that address (keyfile)
`,
}
`}
gendocCommand = cli.Command{
Action: GenDoc,
Name: "gendoc",
Usage: "Generate documentation about json-rpc format",
Description: `
The gendoc generates example structures of the json-rpc communication types.
`}
)
func init() {
@ -203,7 +212,7 @@ func init() {
advancedMode,
}
app.Action = signer
app.Commands = []cli.Command{initCommand, attestCommand, setCredentialCommand}
app.Commands = []cli.Command{initCommand, attestCommand, setCredentialCommand, gendocCommand}
}
func main() {
@ -743,6 +752,154 @@ func decryptSeed(keyjson []byte, auth string) ([]byte, error) {
return seed, err
}
// GenDoc outputs examples of all structures used in json-rpc communication
func GenDoc(ctx *cli.Context) {
var (
a = common.HexToAddress("0xdeadbeef000000000000000000000000deadbeef")
b = common.HexToAddress("0x1111111122222222222233333333334444444444")
meta = core.Metadata{
Scheme: "http",
Local: "localhost:8545",
Origin: "www.malicious.ru",
Remote: "localhost:9999",
UserAgent: "Firefox 3.2",
}
output []string
add = func(name, desc string, v interface{}) {
if data, err := json.MarshalIndent(v, "", " "); err == nil {
output = append(output, fmt.Sprintf("### %s\n\n%s\n\nExample:\n```json\n%s\n```", name, desc, data))
} else {
log.Error("Error generating output", err)
}
}
)
{ // Sign plain text request
desc := "SignDataRequest contains information about a pending request to sign some data. " +
"The data to be signed can be of various types, defined by content-type. Clef has done most " +
"of the work in canonicalizing and making sense of the data, and it's up to the UI to present" +
"the user with the contents of the `message`"
sighash, msg := accounts.TextAndHash([]byte("hello world"))
message := []*core.NameValueType{{"message", msg, accounts.MimetypeTextPlain}}
add("SignDataRequest", desc, &core.SignDataRequest{
Address: common.NewMixedcaseAddress(a),
Meta: meta,
ContentType: accounts.MimetypeTextPlain,
Rawdata: []byte(msg),
Message: message,
Hash: sighash})
}
{ // Sign plain text response
add("SignDataResponse - approve", "Response to SignDataRequest",
&core.SignDataResponse{Password: "apassword", Approved: true})
add("SignDataResponse - deny", "Response to SignDataRequest",
&core.SignDataResponse{})
}
{ // Sign transaction request
desc := "SignTxRequest contains information about a pending request to sign a transaction. " +
"Aside from the transaction itself, there is also a `call_info`-struct. That struct contains " +
"messages of various types, that the user should be informed of." +
"\n\n" +
"As in any request, it's important to consider that the `meta` info also contains untrusted data." +
"\n\n" +
"The `transaction` (on input into clef) can have either `data` or `input` -- if both are set, " +
"they must be identical, otherwise an error is generated. " +
"However, Clef will always use `data` when passing this struct on (if Clef does otherwise, please file a ticket)"
data := hexutil.Bytes([]byte{0x01, 0x02, 0x03, 0x04})
add("SignTxRequest", desc, &core.SignTxRequest{
Meta: meta,
Callinfo: []core.ValidationInfo{
{"Warning", "Something looks odd, show this message as a warning"},
{"Info", "User should see this aswell"},
},
Transaction: core.SendTxArgs{
Data: &data,
Nonce: 0x1,
Value: hexutil.Big(*big.NewInt(6)),
From: common.NewMixedcaseAddress(a),
To: nil,
GasPrice: hexutil.Big(*big.NewInt(5)),
Gas: 1000,
Input: nil,
}})
}
{ // Sign tx response
data := hexutil.Bytes([]byte{0x04, 0x03, 0x02, 0x01})
add("SignDataResponse - approve", "Response to SignDataRequest. This response needs to contain the `transaction`"+
", because the UI is free to make modifications to the transaction.",
&core.SignTxResponse{Password: "apassword", Approved: true,
Transaction: core.SendTxArgs{
Data: &data,
Nonce: 0x4,
Value: hexutil.Big(*big.NewInt(6)),
From: common.NewMixedcaseAddress(a),
To: nil,
GasPrice: hexutil.Big(*big.NewInt(5)),
Gas: 1000,
Input: nil,
}})
add("SignDataResponse - deny", "Response to SignDataRequest. When denying a request, there's no need to "+
"provide the transaction in return",
&core.SignDataResponse{})
}
{ // WHen a signed tx is ready to go out
desc := "SignTransactionResult is used in the call `clef` -> `OnApprovedTx(result)`" +
"\n\n" +
"This occurs _after_ successful completion of the entire signing procedure, but right before the signed " +
"transaction is passed to the external caller. This method (and data) can be used by the UI to signal " +
"to the user that the transaction was signed, but it is primarily useful for ruleset implementations." +
"\n\n" +
"A ruleset that implements a rate limitation needs to know what transactions are sent out to the external " +
"interface. By hooking into this methods, the ruleset can maintain track of that count." +
"\n\n" +
"**OBS:** Note that if an attacker can restore your `clef` data to a previous point in time" +
" (e.g through a backup), the attacker can reset such windows, even if he/she is unable to decrypt the content. " +
"\n\n" +
"The `OnApproved` method cannot be responded to, it's purely informative"
rlpdata := common.FromHex("0xf85d640101948a8eafb1cf62bfbeb1741769dae1a9dd47996192018026a0716bd90515acb1e68e5ac5867aa11a1e65399c3349d479f5fb698554ebc6f293a04e8a4ebfff434e971e0ef12c5bf3a881b06fd04fc3f8b8a7291fb67a26a1d4ed")
var tx types.Transaction
rlp.DecodeBytes(rlpdata, &tx)
add("OnApproved - SignTransactionResult", desc, &ethapi.SignTransactionResult{Raw: rlpdata, Tx: &tx})
}
{ // User input
add("UserInputRequest", "Sent when clef needs the user to provide data. If 'password' is true, the input field should be treated accordingly (echo-free)",
&core.UserInputRequest{IsPassword: true, Title: "The title here", Prompt: "The question to ask the user"})
add("UserInputResponse", "Response to SignDataRequest",
&core.UserInputResponse{Text: "The textual response from user"})
}
{ // List request
add("ListRequest", "Sent when a request has been made to list addresses. The UI is provided with the "+
"full `account`s, including local directory names. Note: this information is not passed back to the external caller, "+
"who only sees the `address`es. ",
&core.ListRequest{
Meta: meta,
Accounts: []accounts.Account{
{a, accounts.URL{Scheme: "keystore", Path: "/path/to/keyfile/a"}},
{b, accounts.URL{Scheme: "keystore", Path: "/path/to/keyfile/b"}}},
})
add("UserInputResponse", "Response to list request. The response contains a list of all addresses to show to the caller. "+
"Note: the UI is free to respond with any address the caller, regardless of whether it exists or not",
&core.ListResponse{
Accounts: []accounts.Account{
{common.HexToAddress("0xcowbeef000000cowbeef00000000000000000c0w"), accounts.URL{Path: ".. ignored .."}},
{common.HexToAddress("0xffffffffffffffffffffffffffffffffffffffff"), accounts.URL{}},
}})
}
fmt.Println(`## UI Client interface
These data types are defined in the channel between clef and the UI`)
for _, elem := range output {
fmt.Println(elem)
}
}
/**
//Create Account

6
signer/core/api.go
View File

@ -236,12 +236,6 @@ type (
Message struct {
Text string `json:"text"`
}
PasswordRequest struct {
Prompt string `json:"prompt"`
}
PasswordResponse struct {
Password string `json:"password"`
}
StartupInfo struct {
Info map[string]interface{} `json:"info"`
}

2
signer/core/signed_data.go
View File

@ -250,7 +250,7 @@ func (api *SignerAPI) determineSignatureFormat(ctx context.Context, contentType
message := []*NameValueType{
{
Name: "message",
Typ: "text/plain",
Typ: accounts.MimetypeTextPlain,
Value: msg,
},
}

2
signer/core/types.go
View File

@ -75,7 +75,7 @@ type SendTxArgs struct {
Nonce hexutil.Uint64 `json:"nonce"`
// We accept "data" and "input" for backwards-compatibility reasons.
Data *hexutil.Bytes `json:"data"`
Input *hexutil.Bytes `json:"input"`
Input *hexutil.Bytes `json:"input,omitempty"`
}
func (args SendTxArgs) String() string {

12
signer/rules/rules_test.go
View File

@ -83,10 +83,6 @@ func (alwaysDenyUI) RegisterUIServer(api *core.UIServerAPI) {
func (alwaysDenyUI) OnSignerStartup(info core.StartupInfo) {
}
func (alwaysDenyUI) OnMasterPassword(request *core.PasswordRequest) (core.PasswordResponse, error) {
return core.PasswordResponse{}, nil
}
func (alwaysDenyUI) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
return core.SignTxResponse{Transaction: request.Transaction, Approved: false, Password: ""}, nil
}
@ -261,10 +257,6 @@ func (d *dummyUI) OnApprovedTx(tx ethapi.SignTransactionResult) {
d.calls = append(d.calls, "OnApprovedTx")
}
func (d *dummyUI) OnMasterPassword(request *core.PasswordRequest) (core.PasswordResponse, error) {
return core.PasswordResponse{}, nil
}
func (d *dummyUI) OnSignerStartup(info core.StartupInfo) {
}
@ -543,10 +535,6 @@ func (d *dontCallMe) RegisterUIServer(api *core.UIServerAPI) {
func (d *dontCallMe) OnSignerStartup(info core.StartupInfo) {
}
func (d *dontCallMe) OnMasterPassword(request *core.PasswordRequest) (core.PasswordResponse, error) {
return core.PasswordResponse{}, nil
}
func (d *dontCallMe) ApproveTx(request *core.SignTxRequest) (core.SignTxResponse, error) {
d.t.Fatalf("Did not expect next-handler to be called")
return core.SignTxResponse{}, core.ErrRequestDenied