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298 lines
7.1 KiB
Go
298 lines
7.1 KiB
Go
// Copyright (c) 2016-2017 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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"strings"
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"time"
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"github.com/DanielOaks/girc-go/ircmatch"
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"github.com/DanielOaks/girc-go/ircmsg"
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"github.com/DanielOaks/oragono/irc/custime"
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"github.com/tidwall/buntdb"
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)
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const (
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keyKlineEntry = "bans.kline %s"
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)
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// KLineInfo contains the address itself and expiration time for a given network.
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type KLineInfo struct {
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// Mask that is blocked.
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Mask string
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// Matcher, to facilitate fast matching.
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Matcher ircmatch.Matcher
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// Info contains information on the ban.
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Info IPBanInfo
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}
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// KLineManager manages and klines.
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type KLineManager struct {
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// kline'd entries
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entries map[string]*KLineInfo
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}
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// NewKLineManager returns a new KLineManager.
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func NewKLineManager() *KLineManager {
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var km KLineManager
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km.entries = make(map[string]*KLineInfo)
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return &km
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}
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// AllBans returns all bans (for use with APIs, etc).
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func (km *KLineManager) AllBans() map[string]IPBanInfo {
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allb := make(map[string]IPBanInfo)
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for name, info := range km.entries {
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allb[name] = info.Info
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}
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return allb
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}
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// AddMask adds to the blocked list.
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func (km *KLineManager) AddMask(mask string, length *IPRestrictTime, reason string, operReason string) {
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kln := KLineInfo{
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Mask: mask,
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Matcher: ircmatch.MakeMatch(mask),
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Info: IPBanInfo{
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Time: length,
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Reason: reason,
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OperReason: operReason,
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},
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}
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km.entries[mask] = &kln
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}
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// RemoveMask removes a mask from the blocked list.
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func (km *KLineManager) RemoveMask(mask string) {
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delete(km.entries, mask)
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}
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// CheckMasks returns whether or not the hostmask(s) are banned, and how long they are banned for.
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func (km *KLineManager) CheckMasks(masks ...string) (isBanned bool, info *IPBanInfo) {
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// check networks
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var masksToRemove []string
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for _, entryInfo := range km.entries {
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var matches bool
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for _, mask := range masks {
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if entryInfo.Matcher.Match(mask) {
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matches = true
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break
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}
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}
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if !matches {
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continue
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}
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if entryInfo.Info.Time != nil {
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if entryInfo.Info.Time.IsExpired() {
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// ban on network has expired, remove it from our blocked list
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masksToRemove = append(masksToRemove, entryInfo.Mask)
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} else {
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return true, &entryInfo.Info
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}
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} else {
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return true, &entryInfo.Info
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}
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}
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// remove expired networks
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for _, expiredMask := range masksToRemove {
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km.RemoveMask(expiredMask)
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}
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// no matches!
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return false, nil
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}
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// KLINE [MYSELF] [duration] <mask> [ON <server>] [reason [| oper reason]]
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func klineHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
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// check oper permissions
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if !client.class.Capabilities["oper:local_ban"] {
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client.Send(nil, server.name, ERR_NOPRIVS, client.nick, msg.Command, "Insufficient oper privs")
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return false
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}
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currentArg := 0
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// when setting a ban that covers the oper's current connection, we require them to say
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// "KLINE MYSELF" so that we're sure they really mean it.
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var klineMyself bool
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if len(msg.Params) > currentArg+1 && strings.ToLower(msg.Params[currentArg]) == "myself" {
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klineMyself = true
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currentArg++
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}
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// duration
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duration, err := custime.ParseDuration(msg.Params[currentArg])
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durationIsUsed := err == nil
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if durationIsUsed {
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currentArg++
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}
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// get mask
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if len(msg.Params) < currentArg+1 {
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client.Send(nil, server.name, ERR_NEEDMOREPARAMS, client.nick, msg.Command, "Not enough parameters")
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return false
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}
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mask := strings.ToLower(msg.Params[currentArg])
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currentArg++
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// check mask
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if !strings.Contains(mask, "!") && !strings.Contains(mask, "@") {
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mask = mask + "!*@*"
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} else if !strings.Contains(mask, "@") {
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mask = mask + "@*"
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}
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matcher := ircmatch.MakeMatch(mask)
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for _, clientMask := range client.AllNickmasks() {
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if !klineMyself && matcher.Match(clientMask) {
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client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, "This ban matches you. To KLINE yourself, you must use the command: /KLINE MYSELF <arguments>")
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return false
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}
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}
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// check remote
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if len(msg.Params) > currentArg && msg.Params[currentArg] == "ON" {
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client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, "Remote servers not yet supported")
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return false
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}
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// get comment(s)
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reason := "No reason given"
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operReason := "No reason given"
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if len(msg.Params) > currentArg {
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tempReason := strings.TrimSpace(msg.Params[currentArg])
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if len(tempReason) > 0 && tempReason != "|" {
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tempReasons := strings.SplitN(tempReason, "|", 2)
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if tempReasons[0] != "" {
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reason = tempReasons[0]
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}
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if len(tempReasons) > 1 && tempReasons[1] != "" {
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operReason = tempReasons[1]
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} else {
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operReason = reason
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}
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}
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}
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// assemble ban info
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var banTime *IPRestrictTime
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if durationIsUsed {
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banTime = &IPRestrictTime{
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Duration: duration,
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Expires: time.Now().Add(duration),
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}
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}
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info := IPBanInfo{
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Reason: reason,
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OperReason: operReason,
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Time: banTime,
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}
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// save in datastore
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err = server.store.Update(func(tx *buntdb.Tx) error {
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klineKey := fmt.Sprintf(keyKlineEntry, mask)
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// assemble json from ban info
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b, err := json.Marshal(info)
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if err != nil {
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return err
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}
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tx.Set(klineKey, string(b), nil)
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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("Could not successfully save new K-LINE: %s", err.Error()))
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return false
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}
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server.klines.AddMask(mask, banTime, reason, operReason)
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if durationIsUsed {
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client.Notice(fmt.Sprintf("Added temporary (%s) K-Line for %s", duration.String(), mask))
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} else {
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client.Notice(fmt.Sprintf("Added K-Line for %s", mask))
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}
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return false
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}
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func unKLineHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
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// check oper permissions
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if !client.class.Capabilities["oper:local_unban"] {
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client.Send(nil, server.name, ERR_NOPRIVS, client.nick, msg.Command, "Insufficient oper privs")
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return false
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}
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// get host
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mask := msg.Params[0]
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if !strings.Contains(mask, "!") && !strings.Contains(mask, "@") {
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mask = mask + "!*@*"
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} else if !strings.Contains(mask, "@") {
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mask = mask + "@*"
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}
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// save in datastore
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err := server.store.Update(func(tx *buntdb.Tx) error {
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klineKey := fmt.Sprintf(keyKlineEntry, mask)
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// check if it exists or not
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val, err := tx.Get(klineKey)
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if val == "" {
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return errNoExistingBan
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} else if err != nil {
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return err
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}
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tx.Delete(klineKey)
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return nil
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})
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if err != nil {
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client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, fmt.Sprintf("Could not remove ban [%s]", err.Error()))
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return false
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}
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server.klines.RemoveMask(mask)
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client.Notice(fmt.Sprintf("Removed K-Line for %s", mask))
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return false
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}
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func (s *Server) loadKLines() {
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s.klines = NewKLineManager()
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// load from datastore
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s.store.View(func(tx *buntdb.Tx) error {
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//TODO(dan): We could make this safer
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tx.AscendKeys("bans.kline *", func(key, value string) bool {
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// get address name
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key = key[len("bans.kline "):]
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mask := key
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// load ban info
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var info IPBanInfo
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json.Unmarshal([]byte(value), &info)
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// add to the server
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s.klines.AddMask(mask, info.Time, info.Reason, info.OperReason)
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return true // true to continue I guess?
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})
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return nil
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})
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}
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