diff --git a/cmd/faucet/faucet.go b/cmd/faucet/faucet.go index fd34cdec16..f87cfdb725 100644 --- a/cmd/faucet/faucet.go +++ b/cmd/faucet/faucet.go @@ -29,6 +29,7 @@ import ( "io/ioutil" "math/big" "net/http" + "net/url" "os" "path/filepath" "strings" @@ -73,6 +74,9 @@ var ( githubUser = flag.String("github.user", "", "GitHub user to authenticate with for Gist access") githubToken = flag.String("github.token", "", "GitHub personal token to access Gists with") + captchaToken = flag.String("captcha.token", "", "Recaptcha site key to authenticate client side") + captchaSecret = flag.String("captcha.secret", "", "Recaptcha secret key to authenticate server side") + logFlag = flag.Int("loglevel", 3, "Log level to use for Ethereum and the faucet") ) @@ -96,9 +100,10 @@ func main() { } website := new(bytes.Buffer) template.Must(template.New("").Parse(string(tmpl))).Execute(website, map[string]interface{}{ - "Network": *netnameFlag, - "Amount": *payoutFlag, - "Period": period, + "Network": *netnameFlag, + "Amount": *payoutFlag, + "Period": period, + "Recaptcha": *captchaToken, }) // Load and parse the genesis block requested by the user blob, err := ioutil.ReadFile(*genesisFlag) @@ -297,7 +302,8 @@ func (f *faucet) apiHandler(conn *websocket.Conn) { for { // Fetch the next funding request and validate against github var msg struct { - URL string `json:"url"` + URL string `json:"url"` + Captcha string `json:"captcha"` } if err := websocket.JSON.Receive(conn, &msg); err != nil { return @@ -308,6 +314,33 @@ func (f *faucet) apiHandler(conn *websocket.Conn) { } log.Info("Faucet funds requested", "gist", msg.URL) + // If captcha verifications are enabled, make sure we're not dealing with a robot + if *captchaToken != "" { + form := url.Values{} + form.Add("secret", *captchaSecret) + form.Add("response", msg.Captcha) + + res, err := http.PostForm("https://www.google.com/recaptcha/api/siteverify", form) + if err != nil { + websocket.JSON.Send(conn, map[string]string{"error": err.Error()}) + continue + } + var result struct { + Success bool `json:"success"` + Errors json.RawMessage `json:"error-codes"` + } + err = json.NewDecoder(res.Body).Decode(&result) + res.Body.Close() + if err != nil { + websocket.JSON.Send(conn, map[string]string{"error": err.Error()}) + continue + } + if !result.Success { + log.Warn("Captcha verification failed", "err", string(result.Errors)) + websocket.JSON.Send(conn, map[string]string{"error": "Beep-boop, you're a robot!"}) + continue + } + } // Retrieve the gist from the GitHub Gist APIs parts := strings.Split(msg.URL, "/") req, _ := http.NewRequest("GET", "https://api.github.com/gists/"+parts[len(parts)-1], nil) @@ -334,7 +367,7 @@ func (f *faucet) apiHandler(conn *websocket.Conn) { continue } if gist.Owner.Login == "" { - websocket.JSON.Send(conn, map[string]string{"error": "Nice try ;)"}) + websocket.JSON.Send(conn, map[string]string{"error": "Anonymous Gists not allowed"}) continue } // Iterate over all the files and look for Ethereum addresses @@ -348,6 +381,17 @@ func (f *faucet) apiHandler(conn *websocket.Conn) { websocket.JSON.Send(conn, map[string]string{"error": "No Ethereum address found to fund"}) continue } + // Validate the user's existence since the API is unhelpful here + if res, err = http.Head("https://github.com/" + gist.Owner.Login); err != nil { + websocket.JSON.Send(conn, map[string]string{"error": err.Error()}) + continue + } + res.Body.Close() + + if res.StatusCode != 200 { + websocket.JSON.Send(conn, map[string]string{"error": "Invalid user... boom!"}) + continue + } // Ensure the user didn't request funds too recently f.lock.Lock() var ( diff --git a/cmd/faucet/faucet.html b/cmd/faucet/faucet.html index 570145ea2b..9e02134b78 100644 --- a/cmd/faucet/faucet.html +++ b/cmd/faucet/faucet.html @@ -51,9 +51,10 @@
This Ether faucet is running on the {{.Network}} network. To prevent malicious actors from exhausting all available funds or accumulating enough Ether to mount long running spam attacks, requests are tied to GitHub accounts. Anyone having a GitHub account may request funds within the permitted limit of {{.Amount}} Ether(s) / {{.Period}}.
+This Ether faucet is running on the {{.Network}} network. To prevent malicious actors from exhausting all available funds or accumulating enough Ether to mount long running spam attacks, requests are tied to GitHub accounts. Anyone having a GitHub account may request funds within the permitted limit of {{.Amount}} Ether(s) / {{.Period}}.{{if .Recaptcha}} The faucet is running invisible reCaptcha protection against bots.{{end}}
To request funds, simply create a GitHub Gist with your Ethereum address pasted into the contents (the file name doesn't matter), copy paste the gists URL into the above input box and fire away! You can track the current pending requests below the input field to see how much you have to wait until your turn comes.