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dendrite/cmd/create-account/main.go

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// Copyright 2017 Vector Creations Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"encoding/hex"
"encoding/json"
"flag"
"fmt"
"io"
"net/http"
"os"
"regexp"
"strings"
"time"
"github.com/tidwall/gjson"
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"github.com/sirupsen/logrus"
"golang.org/x/term"
"github.com/matrix-org/dendrite/setup"
)
const usage = `Usage: %s
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Creates a new user account on the homeserver.
Example:
# provide password by parameter
%s --config dendrite.yaml -username alice -password foobarbaz
# use password from file
%s --config dendrite.yaml -username alice -passwordfile my.pass
# ask user to provide password
%s --config dendrite.yaml -username alice
# read password from stdin
%s --config dendrite.yaml -username alice -passwordstdin < my.pass
cat my.pass | %s --config dendrite.yaml -username alice -passwordstdin
Arguments:
`
var (
username = flag.String("username", "", "The username of the account to register (specify the localpart only, e.g. 'alice' for '@alice:domain.com')")
password = flag.String("password", "", "The password to associate with the account")
pwdFile = flag.String("passwordfile", "", "The file to use for the password (e.g. for automated account creation)")
pwdStdin = flag.Bool("passwordstdin", false, "Reads the password from stdin")
isAdmin = flag.Bool("admin", false, "Create an admin account")
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resetPassword = flag.Bool("reset-password", false, "Deprecated")
serverURL = flag.String("url", "http://localhost:8008", "The URL to connect to.")
validUsernameRegex = regexp.MustCompile(`^[0-9a-z_\-=./]+$`)
timeout = flag.Duration("timeout", time.Second*30, "Timeout for the http client when connecting to the server")
)
var cl = http.Client{
Timeout: time.Second * 30,
Transport: http.DefaultTransport,
}
func main() {
name := os.Args[0]
flag.Usage = func() {
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_, _ = fmt.Fprintf(os.Stderr, usage, name, name, name, name, name, name)
flag.PrintDefaults()
}
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cfg := setup.ParseFlags(true)
if *resetPassword {
logrus.Fatalf("The reset-password flag has been replaced by the POST /_dendrite/admin/resetPassword/{localpart} admin API.")
}
if cfg.ClientAPI.RegistrationSharedSecret == "" {
logrus.Fatalln("Shared secret registration is not enabled, enable it by setting a shared secret in the config: 'client_api.registration_shared_secret'")
}
if *username == "" {
flag.Usage()
os.Exit(1)
}
if !validUsernameRegex.MatchString(*username) {
logrus.Warn("Username can only contain characters a-z, 0-9, or '_-./='")
os.Exit(1)
}
if len(fmt.Sprintf("@%s:%s", *username, cfg.Global.ServerName)) > 255 {
logrus.Fatalf("Username can not be longer than 255 characters: %s", fmt.Sprintf("@%s:%s", *username, cfg.Global.ServerName))
}
pass, err := getPassword(*password, *pwdFile, *pwdStdin, os.Stdin)
if err != nil {
logrus.Fatalln(err)
}
cl.Timeout = *timeout
accessToken, err := sharedSecretRegister(cfg.ClientAPI.RegistrationSharedSecret, *serverURL, *username, pass, *isAdmin)
if err != nil {
logrus.Fatalln("Failed to create the account:", err.Error())
}
logrus.Infof("Created account: %s (AccessToken: %s)", *username, accessToken)
}
type sharedSecretRegistrationRequest struct {
User string `json:"username"`
Password string `json:"password"`
Nonce string `json:"nonce"`
MacStr string `json:"mac"`
Admin bool `json:"admin"`
}
func sharedSecretRegister(sharedSecret, serverURL, localpart, password string, admin bool) (accessToken string, err error) {
registerURL := fmt.Sprintf("%s/_synapse/admin/v1/register", strings.Trim(serverURL, "/"))
nonceReq, err := http.NewRequest(http.MethodGet, registerURL, nil)
if err != nil {
return "", fmt.Errorf("unable to create http request: %w", err)
}
nonceResp, err := cl.Do(nonceReq)
if err != nil {
return "", fmt.Errorf("unable to get nonce: %w", err)
}
body, err := io.ReadAll(nonceResp.Body)
if err != nil {
return "", fmt.Errorf("failed to read response body: %w", err)
}
defer nonceResp.Body.Close() // nolint: errcheck
nonce := gjson.GetBytes(body, "nonce").Str
adminStr := "notadmin"
if admin {
adminStr = "admin"
}
reg := sharedSecretRegistrationRequest{
User: localpart,
Password: password,
Nonce: nonce,
Admin: admin,
}
macStr, err := getRegisterMac(sharedSecret, nonce, localpart, password, adminStr)
if err != nil {
return "", err
}
reg.MacStr = macStr
js, err := json.Marshal(reg)
if err != nil {
return "", fmt.Errorf("unable to marshal json: %w", err)
}
registerReq, err := http.NewRequest(http.MethodPost, registerURL, bytes.NewBuffer(js))
if err != nil {
return "", fmt.Errorf("unable to create http request: %w", err)
}
regResp, err := cl.Do(registerReq)
if err != nil {
return "", fmt.Errorf("unable to create account: %w", err)
}
defer regResp.Body.Close() // nolint: errcheck
if regResp.StatusCode < 200 || regResp.StatusCode >= 300 {
body, _ = io.ReadAll(regResp.Body)
return "", fmt.Errorf(gjson.GetBytes(body, "error").Str)
}
r, _ := io.ReadAll(regResp.Body)
return gjson.GetBytes(r, "access_token").Str, nil
}
func getRegisterMac(sharedSecret, nonce, localpart, password, adminStr string) (string, error) {
joined := strings.Join([]string{nonce, localpart, password, adminStr}, "\x00")
mac := hmac.New(sha1.New, []byte(sharedSecret))
_, err := mac.Write([]byte(joined))
if err != nil {
return "", fmt.Errorf("unable to construct mac: %w", err)
}
regMac := mac.Sum(nil)
return hex.EncodeToString(regMac), nil
}
func getPassword(password, pwdFile string, pwdStdin bool, r io.Reader) (string, error) {
// read password from file
if pwdFile != "" {
pw, err := os.ReadFile(pwdFile)
if err != nil {
return "", fmt.Errorf("Unable to read password from file: %v", err)
}
return strings.TrimSpace(string(pw)), nil
}
// read password from stdin
if pwdStdin {
data, err := io.ReadAll(r)
if err != nil {
return "", fmt.Errorf("Unable to read password from stdin: %v", err)
}
return strings.TrimSpace(string(data)), nil
}
// If no parameter was set, ask the user to provide the password
if password == "" {
fmt.Print("Enter Password: ")
bytePassword, err := term.ReadPassword(int(os.Stdin.Fd()))
if err != nil {
return "", fmt.Errorf("Unable to read password: %v", err)
}
fmt.Println()
fmt.Print("Confirm Password: ")
bytePassword2, err := term.ReadPassword(int(os.Stdin.Fd()))
if err != nil {
return "", fmt.Errorf("Unable to read password: %v", err)
}
fmt.Println()
if strings.TrimSpace(string(bytePassword)) != strings.TrimSpace(string(bytePassword2)) {
return "", fmt.Errorf("Entered passwords don't match")
}
return strings.TrimSpace(string(bytePassword)), nil
}
return password, nil
}