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310 lines
9.2 KiB
Go
310 lines
9.2 KiB
Go
// Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
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// released under the MIT license
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package irc
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import (
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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"time"
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"github.com/goshuirc/irc-go/ircfmt"
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"github.com/goshuirc/irc-go/ircmsg"
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"github.com/oragono/oragono/irc/passwd"
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"github.com/oragono/oragono/irc/sno"
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"github.com/tidwall/buntdb"
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)
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const nickservHelp = `NickServ lets you register and log into a user account.
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To register an account:
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/NS REGISTER username [password]
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Leave out [password] if you're registering using your client certificate fingerprint.
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To login to an account:
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/NS IDENTIFY [username password]
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Leave out [username password] to use your client certificate fingerprint. Otherwise,
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the given username and password will be used.`
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// nsHandler handles the /NS and /NICKSERV commands
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func nsHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
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server.nickservReceivePrivmsg(client, strings.Join(msg.Params, " "))
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return false
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}
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func (server *Server) nickservReceiveNotice(client *Client, message string) {
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// do nothing
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}
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// extractParam extracts a parameter from the given string, returning the param and the rest of the string.
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func extractParam(line string) (string, string) {
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rawParams := strings.SplitN(strings.TrimSpace(line), " ", 2)
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param0 := rawParams[0]
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var param1 string
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if 1 < len(rawParams) {
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param1 = strings.TrimSpace(rawParams[1])
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}
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return param0, param1
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}
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func (server *Server) nickservReceivePrivmsg(client *Client, message string) {
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command, params := extractParam(message)
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command = strings.ToLower(command)
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if command == "help" {
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for _, line := range strings.Split(nickservHelp, "\n") {
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client.Notice(line)
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}
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} else if command == "register" {
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// get params
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username, passphrase := extractParam(params)
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// fail out if we need to
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if username == "" {
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client.Notice(client.t("No username supplied"))
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return
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}
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certfp := client.certfp
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if passphrase == "" && certfp == "" {
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client.Notice(client.t("You need to either supply a passphrase or be connected via TLS with a client cert"))
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return
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}
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if !server.accountRegistration.Enabled {
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client.Notice(client.t("Account registration has been disabled"))
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return
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}
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if client.LoggedIntoAccount() {
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if server.accountRegistration.AllowMultiplePerConnection {
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client.LogoutOfAccount()
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} else {
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client.Notice(client.t("You're already logged into an account"))
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return
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}
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}
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// get and sanitise account name
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account := strings.TrimSpace(username)
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casefoldedAccount, err := CasefoldName(account)
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// probably don't need explicit check for "*" here... but let's do it anyway just to make sure
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if err != nil || username == "*" {
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client.Notice(client.t("Account name is not valid"))
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return
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}
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// check whether account exists
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// do it all in one write tx to prevent races
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err = server.store.Update(func(tx *buntdb.Tx) error {
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accountKey := fmt.Sprintf(keyAccountExists, casefoldedAccount)
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_, err := tx.Get(accountKey)
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if err != buntdb.ErrNotFound {
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//TODO(dan): if account verified key doesn't exist account is not verified, calc the maximum time without verification and expire and continue if need be
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client.Notice(client.t("Account already exists"))
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return errAccountCreation
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}
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registeredTimeKey := fmt.Sprintf(keyAccountRegTime, casefoldedAccount)
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tx.Set(accountKey, "1", nil)
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tx.Set(fmt.Sprintf(keyAccountName, casefoldedAccount), account, nil)
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tx.Set(registeredTimeKey, strconv.FormatInt(time.Now().Unix(), 10), nil)
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return nil
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})
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// account could not be created and relevant numerics have been dispatched, abort
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if err != nil {
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if err != errAccountCreation {
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client.Notice(client.t("Account registration failed"))
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}
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return
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}
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// store details
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err = server.store.Update(func(tx *buntdb.Tx) error {
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// certfp special lookup key
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if passphrase == "" {
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assembledKeyCertToAccount := fmt.Sprintf(keyCertToAccount, client.certfp)
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// make sure certfp doesn't already exist because that'd be silly
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_, err := tx.Get(assembledKeyCertToAccount)
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if err != buntdb.ErrNotFound {
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return errCertfpAlreadyExists
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}
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tx.Set(assembledKeyCertToAccount, casefoldedAccount, nil)
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}
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// make creds
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var creds AccountCredentials
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// always set passphrase salt
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creds.PassphraseSalt, err = passwd.NewSalt()
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if err != nil {
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return fmt.Errorf("Could not create passphrase salt: %s", err.Error())
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}
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if passphrase == "" {
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creds.Certificate = client.certfp
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} else {
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creds.PassphraseHash, err = server.passwords.GenerateFromPassword(creds.PassphraseSalt, passphrase)
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if err != nil {
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return fmt.Errorf("Could not hash password: %s", err)
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}
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}
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credText, err := json.Marshal(creds)
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if err != nil {
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return fmt.Errorf("Could not marshal creds: %s", err)
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}
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tx.Set(fmt.Sprintf(keyAccountCredentials, account), string(credText), nil)
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return nil
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})
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// details could not be stored and relevant numerics have been dispatched, abort
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if err != nil {
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errMsg := "Could not register"
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if err == errCertfpAlreadyExists {
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errMsg = "An account already exists for your certificate fingerprint"
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}
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client.Notice(errMsg)
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removeFailedAccRegisterData(server.store, casefoldedAccount)
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return
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}
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err = server.store.Update(func(tx *buntdb.Tx) error {
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tx.Set(fmt.Sprintf(keyAccountVerified, casefoldedAccount), "1", nil)
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// load acct info inside store tx
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account := ClientAccount{
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Name: username,
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RegisteredAt: time.Now(),
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Clients: []*Client{client},
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}
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//TODO(dan): Consider creating ircd-wide account adding/removing/affecting lock for protecting access to these sorts of variables
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server.accounts[casefoldedAccount] = &account
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client.account = &account
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client.Notice(client.t("Account created"))
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client.Send(nil, server.name, RPL_LOGGEDIN, client.nick, client.nickMaskString, account.Name, fmt.Sprintf(client.t("You are now logged in as %s"), account.Name))
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client.Send(nil, server.name, RPL_SASLSUCCESS, client.nick, client.t("Authentication successful"))
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server.snomasks.Send(sno.LocalAccounts, fmt.Sprintf(ircfmt.Unescape("Account registered $c[grey][$r%s$c[grey]] by $c[grey][$r%s$c[grey]]"), account.Name, client.nickMaskString))
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return nil
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})
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if err != nil {
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client.Notice(client.t("Account registration failed"))
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removeFailedAccRegisterData(server.store, casefoldedAccount)
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return
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}
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} else if command == "identify" {
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// fail out if we need to
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if !server.accountAuthenticationEnabled {
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client.Notice(client.t("Login has been disabled"))
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return
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}
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// try passphrase
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username, passphrase := extractParam(params)
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if username != "" && passphrase != "" {
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// keep it the same as in the ACC CREATE stage
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accountKey, err := CasefoldName(username)
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if err != nil {
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client.Notice(client.t("Could not login with your username/password"))
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return
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}
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// load and check acct data all in one update to prevent races.
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// as noted elsewhere, change to proper locking for Account type later probably
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var accountName string
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err = server.store.Update(func(tx *buntdb.Tx) error {
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// confirm account is verified
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_, err = tx.Get(fmt.Sprintf(keyAccountVerified, accountKey))
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if err != nil {
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return errSaslFail
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}
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creds, err := loadAccountCredentials(tx, accountKey)
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if err != nil {
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return err
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}
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// ensure creds are valid
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if len(creds.PassphraseHash) < 1 || len(creds.PassphraseSalt) < 1 || len(passphrase) < 1 {
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return errSaslFail
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}
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err = server.passwords.CompareHashAndPassword(creds.PassphraseHash, creds.PassphraseSalt, passphrase)
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// succeeded, load account info if necessary
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account, exists := server.accounts[accountKey]
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if !exists {
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account = loadAccount(server, tx, accountKey)
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}
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client.LoginToAccount(account)
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accountName = account.Name
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return err
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})
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if err == nil {
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client.Notice(fmt.Sprintf(client.t("You're now logged in as %s"), accountName))
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return
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}
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}
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// try certfp
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certfp := client.certfp
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if certfp != "" {
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var accountName string
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err := server.store.Update(func(tx *buntdb.Tx) error {
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// certfp lookup key
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accountKey, err := tx.Get(fmt.Sprintf(keyCertToAccount, certfp))
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if err != nil {
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return errSaslFail
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}
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// confirm account exists
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_, err = tx.Get(fmt.Sprintf(keyAccountExists, accountKey))
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if err != nil {
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return errSaslFail
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}
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// confirm account is verified
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_, err = tx.Get(fmt.Sprintf(keyAccountVerified, accountKey))
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if err != nil {
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return errSaslFail
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}
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// confirm the certfp in that account's credentials
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creds, err := loadAccountCredentials(tx, accountKey)
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if err != nil || creds.Certificate != client.certfp {
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return errSaslFail
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}
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// succeeded, load account info if necessary
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account, exists := server.accounts[accountKey]
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if !exists {
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account = loadAccount(server, tx, accountKey)
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}
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client.LoginToAccount(account)
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accountName = account.Name
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return nil
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})
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if err == nil {
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client.Notice(fmt.Sprintf(client.t("You're now logged in as %s"), accountName))
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return
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}
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}
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client.Notice(client.t("Could not login with your TLS certificate or supplied username/password"))
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}
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}
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