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- // Copyright (c) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
- // released under the MIT license
-
- package irc
-
- import (
- "crypto/rand"
- "crypto/subtle"
- "encoding/hex"
- "encoding/json"
- "errors"
- "fmt"
- "net/smtp"
- "strconv"
- "strings"
- "sync"
- "time"
-
- "github.com/oragono/oragono/irc/caps"
- "github.com/oragono/oragono/irc/passwd"
- "github.com/tidwall/buntdb"
- )
-
- const (
- keyAccountExists = "account.exists %s"
- keyAccountVerified = "account.verified %s"
- keyAccountCallback = "account.callback %s"
- keyAccountVerificationCode = "account.verificationcode %s"
- keyAccountName = "account.name %s" // stores the 'preferred name' of the account, not casemapped
- keyAccountRegTime = "account.registered.time %s"
- keyAccountCredentials = "account.credentials %s"
- keyAccountAdditionalNicks = "account.additionalnicks %s"
- keyCertToAccount = "account.creds.certfp %s"
- )
-
- // everything about accounts is persistent; therefore, the database is the authoritative
- // source of truth for all account information. anything on the heap is just a cache
- type AccountManager struct {
- sync.RWMutex // tier 2
- serialCacheUpdateMutex sync.Mutex // tier 3
-
- server *Server
- // track clients logged in to accounts
- accountToClients map[string][]*Client
- nickToAccount map[string]string
- }
-
- func NewAccountManager(server *Server) *AccountManager {
- am := AccountManager{
- accountToClients: make(map[string][]*Client),
- nickToAccount: make(map[string]string),
- server: server,
- }
-
- am.buildNickToAccountIndex()
- return &am
- }
-
- func (am *AccountManager) buildNickToAccountIndex() {
- if !am.server.AccountConfig().NickReservation.Enabled {
- return
- }
-
- result := make(map[string]string)
- existsPrefix := fmt.Sprintf(keyAccountExists, "")
-
- am.serialCacheUpdateMutex.Lock()
- defer am.serialCacheUpdateMutex.Unlock()
-
- err := am.server.store.View(func(tx *buntdb.Tx) error {
- err := tx.AscendGreaterOrEqual("", existsPrefix, func(key, value string) bool {
- if !strings.HasPrefix(key, existsPrefix) {
- return false
- }
- accountName := strings.TrimPrefix(key, existsPrefix)
- if _, err := tx.Get(fmt.Sprintf(keyAccountVerified, accountName)); err == nil {
- result[accountName] = accountName
- }
- if rawNicks, err := tx.Get(fmt.Sprintf(keyAccountAdditionalNicks, accountName)); err == nil {
- additionalNicks := unmarshalReservedNicks(rawNicks)
- for _, nick := range additionalNicks {
- result[nick] = accountName
- }
- }
- return true
- })
- return err
- })
-
- if err != nil {
- am.server.logger.Error("internal", fmt.Sprintf("couldn't read reserved nicks: %v", err))
- } else {
- am.Lock()
- am.nickToAccount = result
- am.Unlock()
- }
-
- return
- }
-
- func (am *AccountManager) NickToAccount(nick string) string {
- cfnick, err := CasefoldName(nick)
- if err != nil {
- return ""
- }
-
- am.RLock()
- defer am.RUnlock()
- return am.nickToAccount[cfnick]
- }
-
- func (am *AccountManager) Register(client *Client, account string, callbackNamespace string, callbackValue string, passphrase string, certfp string) error {
- casefoldedAccount, err := CasefoldName(account)
- if err != nil || account == "" || account == "*" {
- return errAccountCreation
- }
-
- // can't register a guest nickname
- renamePrefix := strings.ToLower(am.server.AccountConfig().NickReservation.RenamePrefix)
- if renamePrefix != "" && strings.HasPrefix(casefoldedAccount, renamePrefix) {
- return errAccountAlreadyRegistered
- }
-
- accountKey := fmt.Sprintf(keyAccountExists, casefoldedAccount)
- accountNameKey := fmt.Sprintf(keyAccountName, casefoldedAccount)
- callbackKey := fmt.Sprintf(keyAccountCallback, casefoldedAccount)
- registeredTimeKey := fmt.Sprintf(keyAccountRegTime, casefoldedAccount)
- credentialsKey := fmt.Sprintf(keyAccountCredentials, casefoldedAccount)
- verificationCodeKey := fmt.Sprintf(keyAccountVerificationCode, casefoldedAccount)
- certFPKey := fmt.Sprintf(keyCertToAccount, certfp)
-
- var creds AccountCredentials
- // always set passphrase salt
- creds.PassphraseSalt, err = passwd.NewSalt()
- if err != nil {
- return errAccountCreation
- }
- // it's fine if this is empty, that just means no certificate is authorized
- creds.Certificate = certfp
- if passphrase != "" {
- creds.PassphraseHash, err = am.server.passwords.GenerateFromPassword(creds.PassphraseSalt, passphrase)
- if err != nil {
- am.server.logger.Error("internal", fmt.Sprintf("could not hash password: %v", err))
- return errAccountCreation
- }
- }
-
- credText, err := json.Marshal(creds)
- if err != nil {
- am.server.logger.Error("internal", fmt.Sprintf("could not marshal credentials: %v", err))
- return errAccountCreation
- }
- credStr := string(credText)
-
- registeredTimeStr := strconv.FormatInt(time.Now().Unix(), 10)
- callbackSpec := fmt.Sprintf("%s:%s", callbackNamespace, callbackValue)
-
- var setOptions *buntdb.SetOptions
- ttl := am.server.AccountConfig().Registration.VerifyTimeout
- if ttl != 0 {
- setOptions = &buntdb.SetOptions{Expires: true, TTL: ttl}
- }
-
- err = func() error {
- am.serialCacheUpdateMutex.Lock()
- defer am.serialCacheUpdateMutex.Unlock()
-
- // can't register an account with the same name as a registered nick
- if am.NickToAccount(casefoldedAccount) != "" {
- return errAccountAlreadyRegistered
- }
-
- return am.server.store.Update(func(tx *buntdb.Tx) error {
- _, err := am.loadRawAccount(tx, casefoldedAccount)
- if err != errAccountDoesNotExist {
- return errAccountAlreadyRegistered
- }
-
- if certfp != "" {
- // make sure certfp doesn't already exist because that'd be silly
- _, err := tx.Get(certFPKey)
- if err != buntdb.ErrNotFound {
- return errCertfpAlreadyExists
- }
- }
-
- tx.Set(accountKey, "1", setOptions)
- tx.Set(accountNameKey, account, setOptions)
- tx.Set(registeredTimeKey, registeredTimeStr, setOptions)
- tx.Set(credentialsKey, credStr, setOptions)
- tx.Set(callbackKey, callbackSpec, setOptions)
- if certfp != "" {
- tx.Set(certFPKey, casefoldedAccount, setOptions)
- }
- return nil
- })
- }()
-
- if err != nil {
- return err
- }
-
- code, err := am.dispatchCallback(client, casefoldedAccount, callbackNamespace, callbackValue)
- if err != nil {
- am.Unregister(casefoldedAccount)
- return errCallbackFailed
- } else {
- return am.server.store.Update(func(tx *buntdb.Tx) error {
- _, _, err = tx.Set(verificationCodeKey, code, setOptions)
- return err
- })
- }
- }
-
- func (am *AccountManager) dispatchCallback(client *Client, casefoldedAccount string, callbackNamespace string, callbackValue string) (string, error) {
- if callbackNamespace == "*" || callbackNamespace == "none" {
- return "", nil
- } else if callbackNamespace == "mailto" {
- return am.dispatchMailtoCallback(client, casefoldedAccount, callbackValue)
- } else {
- return "", errors.New(fmt.Sprintf("Callback not implemented: %s", callbackNamespace))
- }
- }
-
- func (am *AccountManager) dispatchMailtoCallback(client *Client, casefoldedAccount string, callbackValue string) (code string, err error) {
- config := am.server.AccountConfig().Registration.Callbacks.Mailto
- buf := make([]byte, 16)
- rand.Read(buf)
- code = hex.EncodeToString(buf)
-
- subject := config.VerifyMessageSubject
- if subject == "" {
- subject = fmt.Sprintf(client.t("Verify your account on %s"), am.server.name)
- }
- messageStrings := []string{
- fmt.Sprintf("From: %s\r\n", config.Sender),
- fmt.Sprintf("To: %s\r\n", callbackValue),
- fmt.Sprintf("Subject: %s\r\n", subject),
- "\r\n", // end headers, begin message body
- fmt.Sprintf(client.t("Account: %s"), casefoldedAccount) + "\r\n",
- fmt.Sprintf(client.t("Verification code: %s"), code) + "\r\n",
- "\r\n",
- client.t("To verify your account, issue one of these commands:") + "\r\n",
- fmt.Sprintf("/MSG NickServ VERIFY %s %s", casefoldedAccount, code) + "\r\n",
- }
-
- var message []byte
- for i := 0; i < len(messageStrings); i++ {
- message = append(message, []byte(messageStrings[i])...)
- }
- addr := fmt.Sprintf("%s:%d", config.Server, config.Port)
- var auth smtp.Auth
- if config.Username != "" && config.Password != "" {
- auth = smtp.PlainAuth("", config.Username, config.Password, config.Server)
- }
-
- // TODO: this will never send the password in plaintext over a nonlocal link,
- // but it might send the email in plaintext, regardless of the value of
- // config.TLS.InsecureSkipVerify
- err = smtp.SendMail(addr, auth, config.Sender, []string{callbackValue}, message)
- if err != nil {
- am.server.logger.Error("internal", fmt.Sprintf("Failed to dispatch e-mail: %v", err))
- }
- return
- }
-
- func (am *AccountManager) Verify(client *Client, account string, code string) error {
- casefoldedAccount, err := CasefoldName(account)
- if err != nil || account == "" || account == "*" {
- return errAccountVerificationFailed
- }
-
- verifiedKey := fmt.Sprintf(keyAccountVerified, casefoldedAccount)
- accountKey := fmt.Sprintf(keyAccountExists, casefoldedAccount)
- accountNameKey := fmt.Sprintf(keyAccountName, casefoldedAccount)
- registeredTimeKey := fmt.Sprintf(keyAccountRegTime, casefoldedAccount)
- verificationCodeKey := fmt.Sprintf(keyAccountVerificationCode, casefoldedAccount)
- callbackKey := fmt.Sprintf(keyAccountCallback, casefoldedAccount)
- credentialsKey := fmt.Sprintf(keyAccountCredentials, casefoldedAccount)
-
- var raw rawClientAccount
-
- func() {
- am.serialCacheUpdateMutex.Lock()
- defer am.serialCacheUpdateMutex.Unlock()
-
- err = am.server.store.Update(func(tx *buntdb.Tx) error {
- raw, err = am.loadRawAccount(tx, casefoldedAccount)
- if err == errAccountDoesNotExist {
- return errAccountDoesNotExist
- } else if err != nil {
- return errAccountVerificationFailed
- } else if raw.Verified {
- return errAccountAlreadyVerified
- }
-
- // actually verify the code
- // a stored code of "" means a none callback / no code required
- success := false
- storedCode, err := tx.Get(verificationCodeKey)
- if err == nil {
- // this is probably unnecessary
- if storedCode == "" || subtle.ConstantTimeCompare([]byte(code), []byte(storedCode)) == 1 {
- success = true
- }
- }
- if !success {
- return errAccountVerificationInvalidCode
- }
-
- // verify the account
- tx.Set(verifiedKey, "1", nil)
- // don't need the code anymore
- tx.Delete(verificationCodeKey)
- // re-set all other keys, removing the TTL
- tx.Set(accountKey, "1", nil)
- tx.Set(accountNameKey, raw.Name, nil)
- tx.Set(registeredTimeKey, raw.RegisteredAt, nil)
- tx.Set(callbackKey, raw.Callback, nil)
- tx.Set(credentialsKey, raw.Credentials, nil)
-
- var creds AccountCredentials
- // XXX we shouldn't do (de)serialization inside the txn,
- // but this is like 2 usec on my system
- json.Unmarshal([]byte(raw.Credentials), &creds)
- if creds.Certificate != "" {
- certFPKey := fmt.Sprintf(keyCertToAccount, creds.Certificate)
- tx.Set(certFPKey, casefoldedAccount, nil)
- }
-
- return nil
- })
-
- if err == nil {
- am.Lock()
- am.nickToAccount[casefoldedAccount] = casefoldedAccount
- am.Unlock()
- }
- }()
-
- if err != nil {
- return err
- }
-
- am.Login(client, raw.Name)
- return nil
- }
-
- func marshalReservedNicks(nicks []string) string {
- return strings.Join(nicks, ",")
- }
-
- func unmarshalReservedNicks(nicks string) (result []string) {
- if nicks == "" {
- return
- }
- return strings.Split(nicks, ",")
- }
-
- func (am *AccountManager) SetNickReserved(client *Client, nick string, saUnreserve bool, reserve bool) error {
- cfnick, err := CasefoldName(nick)
- // garbage nick, or garbage options, or disabled
- nrconfig := am.server.AccountConfig().NickReservation
- if err != nil || cfnick == "" || (reserve && saUnreserve) || !nrconfig.Enabled {
- return errAccountNickReservationFailed
- }
-
- // the cache is in sync with the DB while we hold serialCacheUpdateMutex
- am.serialCacheUpdateMutex.Lock()
- defer am.serialCacheUpdateMutex.Unlock()
-
- // find the affected account, which is usually the client's:
- account := client.Account()
- if saUnreserve {
- // unless this is a sadrop:
- account = am.NickToAccount(cfnick)
- if account == "" {
- // nothing to do
- return nil
- }
- }
- if account == "" {
- return errAccountNotLoggedIn
- }
-
- accountForNick := am.NickToAccount(cfnick)
- if reserve && accountForNick != "" {
- return errNicknameReserved
- } else if !reserve && !saUnreserve && accountForNick != account {
- return errNicknameReserved
- } else if !reserve && cfnick == account {
- return errAccountCantDropPrimaryNick
- }
-
- nicksKey := fmt.Sprintf(keyAccountAdditionalNicks, account)
- unverifiedAccountKey := fmt.Sprintf(keyAccountExists, cfnick)
- err = am.server.store.Update(func(tx *buntdb.Tx) error {
- if reserve {
- // unverified accounts don't show up in NickToAccount yet (which is intentional),
- // however you shouldn't be able to reserve a nick out from under them
- _, err := tx.Get(unverifiedAccountKey)
- if err == nil {
- return errNicknameReserved
- }
- }
-
- rawNicks, err := tx.Get(nicksKey)
- if err != nil && err != buntdb.ErrNotFound {
- return err
- }
-
- nicks := unmarshalReservedNicks(rawNicks)
-
- if reserve {
- if len(nicks) >= nrconfig.AdditionalNickLimit {
- return errAccountTooManyNicks
- }
- nicks = append(nicks, cfnick)
- } else {
- var newNicks []string
- for _, reservedNick := range nicks {
- if reservedNick != cfnick {
- newNicks = append(newNicks, reservedNick)
- }
- }
- nicks = newNicks
- }
-
- marshaledNicks := marshalReservedNicks(nicks)
- _, _, err = tx.Set(nicksKey, string(marshaledNicks), nil)
- return err
- })
-
- if err == errAccountTooManyNicks || err == errNicknameReserved {
- return err
- } else if err != nil {
- return errAccountNickReservationFailed
- }
-
- // success
- am.Lock()
- defer am.Unlock()
- if reserve {
- am.nickToAccount[cfnick] = account
- } else {
- delete(am.nickToAccount, cfnick)
- }
- return nil
- }
-
- func (am *AccountManager) AuthenticateByPassphrase(client *Client, accountName string, passphrase string) error {
- account, err := am.LoadAccount(accountName)
- if err != nil {
- return err
- }
-
- if !account.Verified {
- return errAccountUnverified
- }
-
- err = am.server.passwords.CompareHashAndPassword(
- account.Credentials.PassphraseHash, account.Credentials.PassphraseSalt, passphrase)
- if err != nil {
- return errAccountInvalidCredentials
- }
-
- am.Login(client, account.Name)
- return nil
- }
-
- func (am *AccountManager) LoadAccount(accountName string) (result ClientAccount, err error) {
- casefoldedAccount, err := CasefoldName(accountName)
- if err != nil {
- err = errAccountDoesNotExist
- return
- }
-
- var raw rawClientAccount
- am.server.store.View(func(tx *buntdb.Tx) error {
- raw, err = am.loadRawAccount(tx, casefoldedAccount)
- return nil
- })
- if err != nil {
- return
- }
-
- result.Name = raw.Name
- regTimeInt, _ := strconv.ParseInt(raw.RegisteredAt, 10, 64)
- result.RegisteredAt = time.Unix(regTimeInt, 0)
- e := json.Unmarshal([]byte(raw.Credentials), &result.Credentials)
- if e != nil {
- am.server.logger.Error("internal", fmt.Sprintf("could not unmarshal credentials: %v", e))
- err = errAccountDoesNotExist
- return
- }
- result.AdditionalNicks = unmarshalReservedNicks(raw.AdditionalNicks)
- result.Verified = raw.Verified
- return
- }
-
- func (am *AccountManager) loadRawAccount(tx *buntdb.Tx, casefoldedAccount string) (result rawClientAccount, err error) {
- accountKey := fmt.Sprintf(keyAccountExists, casefoldedAccount)
- accountNameKey := fmt.Sprintf(keyAccountName, casefoldedAccount)
- registeredTimeKey := fmt.Sprintf(keyAccountRegTime, casefoldedAccount)
- credentialsKey := fmt.Sprintf(keyAccountCredentials, casefoldedAccount)
- verifiedKey := fmt.Sprintf(keyAccountVerified, casefoldedAccount)
- callbackKey := fmt.Sprintf(keyAccountCallback, casefoldedAccount)
- nicksKey := fmt.Sprintf(keyAccountAdditionalNicks, casefoldedAccount)
-
- _, e := tx.Get(accountKey)
- if e == buntdb.ErrNotFound {
- err = errAccountDoesNotExist
- return
- }
-
- result.Name, _ = tx.Get(accountNameKey)
- result.RegisteredAt, _ = tx.Get(registeredTimeKey)
- result.Credentials, _ = tx.Get(credentialsKey)
- result.Callback, _ = tx.Get(callbackKey)
- result.AdditionalNicks, _ = tx.Get(nicksKey)
-
- if _, e = tx.Get(verifiedKey); e == nil {
- result.Verified = true
- }
-
- return
- }
-
- func (am *AccountManager) Unregister(account string) error {
- casefoldedAccount, err := CasefoldName(account)
- if err != nil {
- return errAccountDoesNotExist
- }
-
- accountKey := fmt.Sprintf(keyAccountExists, casefoldedAccount)
- accountNameKey := fmt.Sprintf(keyAccountName, casefoldedAccount)
- registeredTimeKey := fmt.Sprintf(keyAccountRegTime, casefoldedAccount)
- credentialsKey := fmt.Sprintf(keyAccountCredentials, casefoldedAccount)
- callbackKey := fmt.Sprintf(keyAccountCallback, casefoldedAccount)
- verificationCodeKey := fmt.Sprintf(keyAccountVerificationCode, casefoldedAccount)
- verifiedKey := fmt.Sprintf(keyAccountVerified, casefoldedAccount)
- nicksKey := fmt.Sprintf(keyAccountAdditionalNicks, casefoldedAccount)
-
- var clients []*Client
-
- var credText string
- var rawNicks string
-
- am.serialCacheUpdateMutex.Lock()
- defer am.serialCacheUpdateMutex.Unlock()
-
- am.server.store.Update(func(tx *buntdb.Tx) error {
- tx.Delete(accountKey)
- tx.Delete(accountNameKey)
- tx.Delete(verifiedKey)
- tx.Delete(registeredTimeKey)
- tx.Delete(callbackKey)
- tx.Delete(verificationCodeKey)
- rawNicks, _ = tx.Get(nicksKey)
- tx.Delete(nicksKey)
- credText, err = tx.Get(credentialsKey)
- tx.Delete(credentialsKey)
- return nil
- })
-
- if err == nil {
- var creds AccountCredentials
- if err = json.Unmarshal([]byte(credText), &creds); err == nil && creds.Certificate != "" {
- certFPKey := fmt.Sprintf(keyCertToAccount, creds.Certificate)
- am.server.store.Update(func(tx *buntdb.Tx) error {
- if account, err := tx.Get(certFPKey); err == nil && account == casefoldedAccount {
- tx.Delete(certFPKey)
- }
- return nil
- })
- }
- }
-
- additionalNicks := unmarshalReservedNicks(rawNicks)
-
- am.Lock()
- defer am.Unlock()
-
- clients = am.accountToClients[casefoldedAccount]
- delete(am.accountToClients, casefoldedAccount)
- delete(am.nickToAccount, casefoldedAccount)
- for _, nick := range additionalNicks {
- delete(am.nickToAccount, nick)
- }
- for _, client := range clients {
- am.logoutOfAccount(client)
- }
-
- if err != nil {
- return errAccountDoesNotExist
- }
- return nil
- }
-
- func (am *AccountManager) AuthenticateByCertFP(client *Client) error {
- if client.certfp == "" {
- return errAccountInvalidCredentials
- }
-
- var account string
- var rawAccount rawClientAccount
- certFPKey := fmt.Sprintf(keyCertToAccount, client.certfp)
-
- err := am.server.store.Update(func(tx *buntdb.Tx) error {
- var err error
- account, _ = tx.Get(certFPKey)
- if account == "" {
- return errAccountInvalidCredentials
- }
- rawAccount, err = am.loadRawAccount(tx, account)
- if err != nil || !rawAccount.Verified {
- return errAccountUnverified
- }
- return nil
- })
-
- if err != nil {
- return err
- }
-
- // ok, we found an account corresponding to their certificate
-
- am.Login(client, rawAccount.Name)
- return nil
- }
-
- func (am *AccountManager) Login(client *Client, account string) {
- am.Lock()
- defer am.Unlock()
-
- am.loginToAccount(client, account)
- casefoldedAccount := client.Account()
- am.accountToClients[casefoldedAccount] = append(am.accountToClients[casefoldedAccount], client)
- }
-
- func (am *AccountManager) Logout(client *Client) {
- am.Lock()
- defer am.Unlock()
-
- casefoldedAccount := client.Account()
- if casefoldedAccount == "" {
- return
- }
-
- am.logoutOfAccount(client)
-
- clients := am.accountToClients[casefoldedAccount]
- if len(clients) <= 1 {
- delete(am.accountToClients, casefoldedAccount)
- return
- }
- remainingClients := make([]*Client, len(clients)-1)
- remainingPos := 0
- for currentPos := 0; currentPos < len(clients); currentPos++ {
- if clients[currentPos] != client {
- remainingClients[remainingPos] = clients[currentPos]
- remainingPos++
- }
- }
- am.accountToClients[casefoldedAccount] = remainingClients
- return
- }
-
- var (
- // EnabledSaslMechanisms contains the SASL mechanisms that exist and that we support.
- // This can be moved to some other data structure/place if we need to load/unload mechs later.
- EnabledSaslMechanisms = map[string]func(*Server, *Client, string, []byte, *ResponseBuffer) bool{
- "PLAIN": authPlainHandler,
- "EXTERNAL": authExternalHandler,
- }
- )
-
- // AccountCredentials stores the various methods for verifying accounts.
- type AccountCredentials struct {
- PassphraseSalt []byte
- PassphraseHash []byte
- Certificate string // fingerprint
- }
-
- // ClientAccount represents a user account.
- type ClientAccount struct {
- // Name of the account.
- Name string
- // RegisteredAt represents the time that the account was registered.
- RegisteredAt time.Time
- Credentials AccountCredentials
- Verified bool
- AdditionalNicks []string
- }
-
- // convenience for passing around raw serialized account data
- type rawClientAccount struct {
- Name string
- RegisteredAt string
- Credentials string
- Callback string
- Verified bool
- AdditionalNicks string
- }
-
- // loginToAccount logs the client into the given account.
- func (am *AccountManager) loginToAccount(client *Client, account string) {
- changed := client.SetAccountName(account)
- if changed {
- go client.nickTimer.Touch()
- }
- }
-
- // logoutOfAccount logs the client out of their current account.
- func (am *AccountManager) logoutOfAccount(client *Client) {
- if client.Account() == "" {
- // already logged out
- return
- }
-
- client.SetAccountName("")
- go client.nickTimer.Touch()
-
- // dispatch account-notify
- // TODO: doing the I/O here is kind of a kludge, let's move this somewhere else
- go func() {
- for friend := range client.Friends(caps.AccountNotify) {
- friend.Send(nil, client.NickMaskString(), "ACCOUNT", "*")
- }
- }()
- }
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