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ergo/irc/nickname.go
2020-11-29 00:02:26 -05:00

172 lines
6.7 KiB
Go

// Copyright (c) 2012-2014 Jeremy Latt
// Copyright (c) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
// released under the MIT license
package irc
import (
"crypto/rand"
"fmt"
"strings"
"github.com/goshuirc/irc-go/ircfmt"
"github.com/oragono/oragono/irc/history"
"github.com/oragono/oragono/irc/sno"
"github.com/oragono/oragono/irc/utils"
)
var (
restrictedNicknames = []string{
"=scene=", // used for rp commands
"Global", // global announcements on some networks
// common services not implemented by us:
"MemoServ", "BotServ", "OperServ",
}
restrictedCasefoldedNicks = make(utils.StringSet)
restrictedSkeletons = make(utils.StringSet)
)
func performNickChange(server *Server, client *Client, target *Client, session *Session, nickname string, rb *ResponseBuffer) error {
details := target.Details()
hadNick := details.nick != "*"
origNickMask := details.nickMask
isSanick := client != target
assignedNickname, err, back := client.server.clients.SetNick(target, session, nickname, false)
if err == errNicknameInUse {
if !isSanick {
rb.Add(nil, server.name, ERR_NICKNAMEINUSE, details.nick, utils.SafeErrorParam(nickname), client.t("Nickname is already in use"))
} else {
rb.Add(nil, server.name, "FAIL", "SANICK", "NICKNAME_IN_USE", utils.SafeErrorParam(nickname), client.t("Nickname is already in use"))
}
} else if err == errNicknameReserved {
if !isSanick {
rb.Add(nil, server.name, ERR_NICKNAMEINUSE, details.nick, utils.SafeErrorParam(nickname), client.t("Nickname is reserved by a different account"))
} else {
rb.Add(nil, server.name, "FAIL", "SANICK", "NICKNAME_RESERVED", utils.SafeErrorParam(nickname), client.t("Nickname is reserved by a different account"))
}
} else if err == errNicknameInvalid {
if !isSanick {
rb.Add(nil, server.name, ERR_ERRONEUSNICKNAME, details.nick, utils.SafeErrorParam(nickname), client.t("Erroneous nickname"))
} else {
rb.Add(nil, server.name, "FAIL", "SANICK", "NICKNAME_INVALID", utils.SafeErrorParam(nickname), client.t("Erroneous nickname"))
}
} else if err == errNickAccountMismatch {
// this used to use ERR_NICKNAMEINUSE, but it displayed poorly in some clients;
// ERR_UNKNOWNERROR at least has a better chance of displaying our error text
if !isSanick {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, "NICK", client.t("You must use your account name as your nickname"))
} else {
rb.Add(nil, server.name, "FAIL", "SANICK", "UNKNOWN_ERROR", utils.SafeErrorParam(nickname), client.t("This user's nickname and account name need to be equal"))
}
} else if err == errNickMissing {
if !isSanick {
rb.Add(nil, server.name, ERR_NONICKNAMEGIVEN, details.nick, client.t("No nickname given"))
} else {
rb.Add(nil, server.name, "FAIL", "SANICK", "NICKNAME_INVALID", utils.SafeErrorParam(nickname), client.t("No nickname given"))
}
} else if err == errNoop {
if !isSanick {
// no message
} else {
rb.Add(nil, server.name, "NOTE", "SANICK", "NOOP", utils.SafeErrorParam(nickname), client.t("Client already had the desired nickname"))
}
} else if err != nil {
client.server.logger.Error("internal", "couldn't change nick", nickname, err.Error())
if !isSanick {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, "NICK", client.t("Could not set or change nickname"))
} else {
rb.Add(nil, server.name, "FAIL", "SANICK", "UNKNOWN_ERROR", utils.SafeErrorParam(nickname), client.t("Could not set or change nickname"))
}
}
if err != nil {
return err
}
message := utils.MakeMessage("")
histItem := history.Item{
Type: history.Nick,
Nick: origNickMask,
AccountName: details.accountName,
Message: message,
}
histItem.Params[0] = assignedNickname
client.server.logger.Debug("nick", fmt.Sprintf("%s changed nickname to %s [%s]", origNickMask, assignedNickname, client.NickCasefolded()))
if hadNick {
if client == target {
target.server.snomasks.Send(sno.LocalNicks, fmt.Sprintf(ircfmt.Unescape("$%s$r changed nickname to %s"), details.nick, assignedNickname))
} else {
target.server.snomasks.Send(sno.LocalNicks, fmt.Sprintf(ircfmt.Unescape("Operator %s changed nickname of $%s$r to %s"), client.Nick(), details.nick, assignedNickname))
}
target.server.whoWas.Append(details.WhoWas)
rb.AddFromClient(message.Time, message.Msgid, origNickMask, details.accountName, nil, "NICK", assignedNickname)
for session := range target.Friends() {
if session != rb.session {
session.sendFromClientInternal(false, message.Time, message.Msgid, origNickMask, details.accountName, nil, "NICK", assignedNickname)
}
}
}
if back {
dispatchAwayNotify(session.client, false, "")
}
for _, channel := range target.Channels() {
channel.AddHistoryItem(histItem, details.account)
}
newCfnick := target.NickCasefolded()
if newCfnick != details.nickCasefolded {
client.server.monitorManager.AlertAbout(details.nick, details.nickCasefolded, false)
client.server.monitorManager.AlertAbout(assignedNickname, newCfnick, true)
}
return nil
}
func (server *Server) RandomlyRename(client *Client) {
format := server.Config().Accounts.NickReservation.GuestFormat
buf := make([]byte, 8)
rand.Read(buf)
nick := strings.Replace(format, "*", utils.B32Encoder.EncodeToString(buf), -1)
sessions := client.Sessions()
if len(sessions) == 0 {
// this can happen if they are anonymous and BRB (in general, an always-on
// client has title to its nickname and will never be the victim of
// a call to RandomlyRename)
client.destroy(nil)
return
}
// XXX arbitrarily pick the first session to receive error messages;
// all other sessions receive a `NICK` line same as a friend would
rb := NewResponseBuffer(sessions[0])
performNickChange(server, client, client, nil, nick, rb)
rb.Send(false)
// technically performNickChange can fail to change the nick,
// but if they're still delinquent, the timer will get them later
}
// if force-nick-equals-account is set, account name and nickname must be equal,
// so we need to re-NICK automatically on every login event (IDENTIFY,
// VERIFY, and a REGISTER that auto-verifies). if we can't get the nick
// then we log them out (they will be able to reattach with SASL)
func fixupNickEqualsAccount(client *Client, rb *ResponseBuffer, config *Config, source string) (success bool) {
if !config.Accounts.NickReservation.ForceNickEqualsAccount {
return true
}
if !client.registered {
return true
}
err := performNickChange(client.server, client, client, rb.session, client.AccountName(), rb)
if err != nil && err != errNoop {
client.server.accounts.Logout(client)
if source == "" {
source = client.server.name
}
rb.Add(nil, source, "NOTICE", client.t("A client is already using that account; try logging out and logging back in with SASL"))
return false
}
return true
}