deprecate webircdateway and ngircd

1 files changed, 495 insertions, 0 deletions

diff --git a/deprecated-webircgateway/pkg/webircgateway/client_command_handlers.go b/deprecated-webircgateway/pkg/webircgateway/client_command_handlers.go
new file mode 100644
index 0000000..d5d1fcc
--- /dev/null
+++ b/deprecated-webircgateway/pkg/webircgateway/client_command_handlers.go
@@ -0,0 +1,495 @@
+package webircgateway
+
+import (
+	"errors"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/golang-jwt/jwt/v4"
+	"github.com/kiwiirc/webircgateway/pkg/irc"
+	"github.com/kiwiirc/webircgateway/pkg/recaptcha"
+	"golang.org/x/net/html/charset"
+	"golang.org/x/time/rate"
+)
+
+var MAX_EXTJWT_SIZE = 200
+
+/*
+ * ProcessLineFromUpstream
+ * Processes and makes any changes to a line of data sent from an upstream
+ */
+func (c *Client) ProcessLineFromUpstream(data string) string {
+	client := c
+
+	m, parseErr := irc.ParseLine(data)
+	if parseErr != nil {
+		return data
+	}
+
+	pLen := len(m.Params)
+
+	if pLen > 0 && m.Command == "NICK" && m.Prefix.Nick == c.IrcState.Nick {
+		client.IrcState.Nick = m.Params[0]
+	}
+	if pLen > 0 && m.Command == "001" {
+		client.IrcState.Nick = m.Params[0]
+		client.State = ClientStateConnected
+		client.ServerMessagePrefix = *m.Prefix
+
+		// Throttle writes if configured, but only after registration is complete. Typical IRCd
+		// behavior is to not throttle registration commands.
+		client.ThrottledRecv.Limiter = rate.NewLimiter(rate.Limit(client.UpstreamConfig.Throttle), 1)
+	}
+	if pLen > 0 && m.Command == "005" {
+		tokenPairs := m.Params[1 : pLen-1]
+		iSupport := c.IrcState.ISupport
+		iSupport.Received = true
+		iSupport.Tags = m.Tags
+		iSupport.AddTokens(tokenPairs)
+	}
+	if c.IrcState.ISupport.Received && !c.IrcState.ISupport.Injected && m.Command != "005" {
+		iSupport := c.IrcState.ISupport
+		iSupport.Injected = true
+
+		msg := irc.NewMessage()
+		msg.Command = "005"
+		msg.Prefix = &c.ServerMessagePrefix
+		msg.Params = append(msg.Params, c.IrcState.Nick)
+
+		if iSupport.HasToken("EXTJWT") {
+			c.Log(1, "Upstream already supports EXTJWT, disabling feature")
+			c.Features.ExtJwt = false
+		} else {
+			// Add EXTJWT ISupport token
+			msg.Params = append(msg.Params, "EXTJWT=1")
+			iSupport.AddToken("EXTJWT=1")
+		}
+
+		msg.Params = append(msg.Params, "are supported by this server")
+		if timeTag, ok := c.IrcState.ISupport.Tags["time"]; ok {
+			msg.Tags["time"] = timeTag
+		}
+		if len(msg.Params) > 2 {
+			// Extra tokens were added, send the line
+			c.SendClientSignal("data", msg.ToLine())
+		}
+	}
+	if pLen > 0 && m.Command == "JOIN" && m.Prefix.Nick == c.IrcState.Nick {
+		channel := irc.NewStateChannel(m.GetParam(0, ""))
+		c.IrcState.SetChannel(channel)
+	}
+	if pLen > 0 && m.Command == "PART" && m.Prefix.Nick == c.IrcState.Nick {
+		c.IrcState.RemoveChannel(m.GetParam(0, ""))
+	}
+	if pLen > 0 && m.Command == "QUIT" && m.Prefix.Nick == c.IrcState.Nick {
+		c.IrcState.ClearChannels()
+	}
+	// :server.com 900 m m!m@irc-3jg.1ab.j4ep8h.IP prawnsalad :You are now logged in as prawnsalad
+	if pLen > 0 && m.Command == "900" {
+		c.IrcState.Account = m.GetParam(2, "")
+	}
+	// :server.com 901 itsonlybinary itsonlybinary!itsonlybina@user/itsonlybinary :You are now logged out
+	if m.Command == "901" {
+		c.IrcState.Account = ""
+	}
+	// :prawnsalad!prawn@kiwiirc/prawnsalad MODE #kiwiirc-dev +oo notprawn kiwi-n75
+	if pLen > 0 && m.Command == "MODE" {
+		if strings.HasPrefix(m.GetParam(0, ""), "#") {
+			channelName := m.GetParam(0, "")
+			modes := m.GetParam(1, "")
+
+			channel := c.IrcState.GetChannel(channelName)
+			if channel != nil {
+				channel = irc.NewStateChannel(channelName)
+				c.IrcState.SetChannel(channel)
+			}
+
+			adding := false
+			paramIdx := 1
+			for i := 0; i < len(modes); i++ {
+				mode := string(modes[i])
+
+				if mode == "+" {
+					adding = true
+				} else if mode == "-" {
+					adding = false
+				} else {
+					paramIdx++
+					param := m.GetParam(paramIdx, "")
+					if strings.EqualFold(param, c.IrcState.Nick) {
+						if adding {
+							channel.Modes[mode] = ""
+						} else {
+							delete(channel.Modes, mode)
+						}
+					}
+				}
+			}
+		}
+	}
+
+	// If upstream reports that it supports message-tags natively, disable the wrapping of this feature for
+	// this client
+	if pLen >= 3 &&
+		strings.ToUpper(m.Command) == "CAP" &&
+		m.GetParamU(1, "") == "LS" {
+		// The CAPs could be param 2 or 3 depending on if were using multiple lines to list them all.
+		caps := ""
+		if pLen >= 4 && m.Params[2] == "*" {
+			caps = m.GetParamU(3, "")
+		} else {
+			caps = m.GetParamU(2, "")
+		}
+
+		if containsOneOf(caps, []string{"DRAFT/MESSAGE-TAGS-0.2", "MESSAGE-TAGS"}) {
+			c.Log(1, "Upstream already supports Messagetags, disabling feature")
+			c.Features.Messagetags = false
+		}
+
+		// Inject message-tags cap into the last line of IRCd capabilities
+		if c.Features.Messagetags && m.Params[2] != "*" {
+			m.Params[2] += " message-tags"
+			data = m.ToLine()
+		}
+	}
+
+	// If we requested message-tags, make sure to include it in the ACK when
+	// the IRCd sends the ACK through
+	if m != nil &&
+		client.RequestedMessageTagsCap != "" &&
+		strings.ToUpper(m.Command) == "CAP" &&
+		m.GetParamU(1, "") == "ACK" &&
+		!strings.Contains(m.GetParamU(2, ""), "MESSAGE-TAGS") {
+
+		m.Params[2] += " " + client.RequestedMessageTagsCap
+		data = m.ToLine()
+
+		client.RequestedMessageTagsCap = ""
+	}
+
+	if m != nil && client.Features.Messagetags && c.Gateway.messageTags.CanMessageContainClientTags(m) {
+		// If we have any message tags stored for this message from a previous PRIVMSG sent
+		// by a client, add them back in
+		mTags, mTagsExists := c.Gateway.messageTags.GetTagsFromMessage(client, m.Prefix.Nick, m)
+		if mTagsExists {
+			for k, v := range mTags.Tags {
+				m.Tags[k] = v
+			}
+
+			data = m.ToLine()
+		}
+	}
+
+	return data
+}
+
+/*
+ * ProcessLineFromClient
+ * Processes and makes any changes to a line of data sent from a client
+ */
+func (c *Client) ProcessLineFromClient(line string) (string, error) {
+	message, err := irc.ParseLine(line)
+	// Just pass any random data upstream
+	if err != nil {
+		return line, nil
+	}
+
+	maybeConnectUpstream := func() {
+		verified := false
+		if c.RequiresVerification && !c.Verified {
+			verified = false
+		} else {
+			verified = true
+		}
+
+		if !c.UpstreamStarted && c.IrcState.Username != "" && c.IrcState.Nick != "" && verified {
+			c.connectUpstream()
+		}
+	}
+
+	if !c.Verified && strings.ToUpper(message.Command) == "CAPTCHA" {
+		verified := false
+		if len(message.Params) >= 1 {
+			captcha := recaptcha.R{
+				URL:    c.Gateway.Config.ReCaptchaURL,
+				Secret: c.Gateway.Config.ReCaptchaSecret,
+			}
+
+			verified = captcha.VerifyResponse(message.Params[0])
+		}
+
+		if !verified {
+			c.SendIrcError("Invalid captcha")
+			c.SendClientSignal("state", "closed", "bad_captcha")
+			c.StartShutdown("unverifed")
+		} else {
+			c.Verified = true
+			maybeConnectUpstream()
+		}
+
+		return "", nil
+	}
+
+	// NICK <nickname>
+	if strings.ToUpper(message.Command) == "NICK" && !c.UpstreamStarted {
+		if len(message.Params) > 0 {
+			c.IrcState.Nick = message.Params[0]
+		}
+
+		if !c.UpstreamStarted {
+			maybeConnectUpstream()
+		}
+	}
+
+	// USER <username> <hostname> <servername> <realname>
+	if strings.ToUpper(message.Command) == "USER" && !c.UpstreamStarted {
+		if len(message.Params) < 4 {
+			return line, errors.New("Invalid USER line")
+		}
+
+		if c.Gateway.Config.ClientUsername != "" {
+			message.Params[0] = makeClientReplacements(c.Gateway.Config.ClientUsername, c)
+		}
+		if c.Gateway.Config.ClientRealname != "" {
+			message.Params[3] = makeClientReplacements(c.Gateway.Config.ClientRealname, c)
+		}
+
+		line = message.ToLine()
+
+		c.IrcState.Username = message.Params[0]
+		c.IrcState.RealName = message.Params[3]
+
+		maybeConnectUpstream()
+	}
+
+	if strings.ToUpper(message.Command) == "ENCODING" {
+		if len(message.Params) > 0 {
+			encoding, _ := charset.Lookup(message.Params[0])
+			if encoding == nil {
+				c.Log(1, "Requested unknown encoding, %s", message.Params[0])
+			} else {
+				c.Encoding = message.Params[0]
+				c.Log(1, "Set encoding to %s", message.Params[0])
+			}
+		}
+
+		// Don't send the ENCODING command upstream
+		return "", nil
+	}
+
+	if strings.ToUpper(message.Command) == "HOST" && !c.UpstreamStarted {
+		// HOST irc.network.net:6667
+		// HOST irc.network.net:+6667
+
+		if !c.Gateway.Config.Gateway {
+			return "", nil
+		}
+
+		if len(message.Params) == 0 {
+			return "", nil
+		}
+
+		addr := message.Params[0]
+		if addr == "" {
+			c.SendIrcError("Missing host")
+			c.StartShutdown("missing_host")
+			return "", nil
+		}
+
+		// Parse host:+port into the c.dest* vars
+		portSep := strings.LastIndex(addr, ":")
+		if portSep == -1 {
+			c.DestHost = addr
+			c.DestPort = 6667
+			c.DestTLS = false
+		} else {
+			c.DestHost = addr[0:portSep]
+			portParam := addr[portSep+1:]
+			if len(portParam) > 0 && portParam[0:1] == "+" {
+				c.DestTLS = true
+				c.DestPort, err = strconv.Atoi(portParam[1:])
+				if err != nil {
+					c.DestPort = 6697
+				}
+			} else {
+				c.DestPort, err = strconv.Atoi(portParam[0:])
+				if err != nil {
+					c.DestPort = 6667
+				}
+			}
+		}
+
+		// Don't send the HOST command upstream
+		return "", nil
+	}
+
+	// If the client supports CAP, assume the client also supports parsing MessageTags
+	// When upstream replies with its CAP listing, we check if message-tags is supported by the IRCd already and if so,
+	// we disable this feature flag again to use the IRCds native support.
+	if strings.ToUpper(message.Command) == "CAP" && len(message.Params) > 0 && strings.ToUpper(message.Params[0]) == "LS" {
+		c.Log(1, "Enabling client Messagetags feature")
+		c.Features.Messagetags = true
+	}
+
+	// If we are wrapping the Messagetags feature, make sure the clients REQ message-tags doesn't
+	// get sent upstream
+	if c.Features.Messagetags && strings.ToUpper(message.Command) == "CAP" && message.GetParamU(0, "") == "REQ" {
+		reqCaps := strings.ToLower(message.GetParam(1, ""))
+		capsThatEnableMessageTags := []string{"message-tags", "account-tag", "server-time", "batch"}
+
+		if strings.Contains(reqCaps, "message-tags") {
+			// Rebuild the list of requested caps, without message-tags
+			caps := strings.Split(reqCaps, " ")
+			newCaps := []string{}
+			for _, cap := range caps {
+				if !strings.Contains(strings.ToLower(cap), "message-tags") {
+					newCaps = append(newCaps, cap)
+				} else {
+					c.RequestedMessageTagsCap = cap
+				}
+			}
+
+			if len(newCaps) == 0 {
+				// The only requested CAP was our emulated message-tags
+				// the server will not be sending an ACK so we need to send our own
+				c.SendClientSignal("data", "CAP * ACK :"+c.RequestedMessageTagsCap)
+				return "", nil
+			}
+			message.Params[1] = strings.Join(newCaps, " ")
+			line = message.ToLine()
+		} else if !containsOneOf(reqCaps, capsThatEnableMessageTags) {
+			// Didn't request anything that needs message-tags cap so disable it
+			c.Features.Messagetags = false
+		}
+	}
+
+	if c.Features.Messagetags && message.Command == "TAGMSG" {
+		if len(message.Params) == 0 {
+			return "", nil
+		}
+
+		// We can't be 100% sure what this users correct mask is, so just send the nick
+		message.Prefix.Nick = c.IrcState.Nick
+		message.Prefix.Hostname = ""
+		message.Prefix.Username = ""
+
+		thisHost := strings.ToLower(c.UpstreamConfig.Hostname)
+		target := message.Params[0]
+		for val := range c.Gateway.Clients.IterBuffered() {
+			curClient := val.Val.(*Client)
+			sameHost := strings.ToLower(curClient.UpstreamConfig.Hostname) == thisHost
+			if !sameHost {
+				continue
+			}
+
+			// Only send the message on to either the target nick, or the clients in a set channel
+			if !strings.EqualFold(target, curClient.IrcState.Nick) && !curClient.IrcState.HasChannel(target) {
+				continue
+			}
+
+			curClient.SendClientSignal("data", message.ToLine())
+		}
+
+		return "", nil
+	}
+
+	// Check for any client message tags so that we can store them for replaying to other clients
+	if c.Features.Messagetags && c.Gateway.messageTags.CanMessageContainClientTags(message) {
+		c.Gateway.messageTags.AddTagsFromMessage(c, c.IrcState.Nick, message)
+		// Prevent any client tags heading upstream
+		for k := range message.Tags {
+			if len(k) > 0 && k[0] == '+' {
+				delete(message.Tags, k)
+			}
+		}
+
+		line = message.ToLine()
+	}
+
+	if c.Features.ExtJwt && strings.ToUpper(message.Command) == "EXTJWT" {
+		tokenTarget := message.GetParam(0, "")
+		tokenService := message.GetParam(1, "")
+
+		tokenM := irc.Message{}
+		tokenM.Command = "EXTJWT"
+		tokenM.Prefix = &c.ServerMessagePrefix
+		tokenData := jwt.MapClaims{
+			"exp":     time.Now().UTC().Add(1 * time.Minute).Unix(),
+			"iss":     c.UpstreamConfig.Hostname,
+			"sub":     c.IrcState.Nick,
+			"account": c.IrcState.Account,
+			"umodes":  []string{},
+
+			// Channel specific claims
+			"channel": "",
+			"joined":  0,
+			"cmodes":  []string{},
+		}
+
+		// Use the NetworkCommonAddress if a plugin as assigned one.
+		// This allows plugins to associate different upstream hosts to the same network
+		if c.UpstreamConfig.NetworkCommonAddress != "" {
+			tokenData["iss"] = c.UpstreamConfig.NetworkCommonAddress
+		}
+
+		if tokenTarget == "" || tokenTarget == "*" {
+			tokenM.Params = append(tokenM.Params, "*")
+		} else {
+			targetChan := c.IrcState.GetChannel(tokenTarget)
+			if targetChan == nil {
+				// Channel does not exist in IRC State, send so such channel message
+				failMessage := irc.Message{
+					Command: "403", // ERR_NOSUCHCHANNEL
+					Prefix:  &c.ServerMessagePrefix,
+					Params:  []string{c.IrcState.Nick, tokenTarget, "No such channel"},
+				}
+				c.SendClientSignal("data", failMessage.ToLine())
+				return "", nil
+			}
+
+			tokenM.Params = append(tokenM.Params, tokenTarget)
+
+			tokenData["channel"] = targetChan.Name
+			tokenData["joined"] = targetChan.Joined.Unix()
+
+			modes := []string{}
+			for mode := range targetChan.Modes {
+				modes = append(modes, mode)
+			}
+			tokenData["cmodes"] = modes
+		}
+
+		if tokenService == "" || tokenService == "*" {
+			tokenM.Params = append(tokenM.Params, "*")
+		} else {
+			c.SendIrcFail("EXTJWT", "NO_SUCH_SERVICE", "No such service")
+			return "", nil
+		}
+
+		token := jwt.NewWithClaims(jwt.SigningMethodHS256, tokenData)
+		tokenSigned, tokenSignedErr := token.SignedString([]byte(c.Gateway.Config.Secret))
+		if tokenSignedErr != nil {
+			c.Log(3, "Error creating JWT token. %s", tokenSignedErr.Error())
+			c.SendIrcFail("EXTJWT", "UNKNOWN_ERROR", "Failed to generate token")
+			return "", nil
+		}
+
+		// Spit token if it exceeds max length
+		for len(tokenSigned) > MAX_EXTJWT_SIZE {
+			tokenSignedPart := tokenSigned[:MAX_EXTJWT_SIZE]
+			tokenSigned = tokenSigned[MAX_EXTJWT_SIZE:]
+
+			tokenPartM := tokenM
+			tokenPartM.Params = append(tokenPartM.Params, "*", tokenSignedPart)
+			c.SendClientSignal("data", tokenPartM.ToLine())
+		}
+
+		tokenM.Params = append(tokenM.Params, tokenSigned)
+		c.SendClientSignal("data", tokenM.ToLine())
+
+		return "", nil
+	}
+
+	return line, nil
+}