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add ip-check-script.exempt-sasl

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This commit is contained in:
Shivaram Lingamneni 2022-01-02 01:51:31 -05:00
parent 58d8421f44
commit 0a59f41cf9
5 changed files with 43 additions and 11 deletions
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3
default.yaml
View File

@ -300,6 +300,9 @@ server:
kill-timeout: 1s
# how many scripts are allowed to run at once? 0 for no limit:
max-concurrency: 64
# if true, only check anonymous connections (not logged into an account)
# at the very end of the handshake:
exempt-sasl: false
# IP cloaking hides users' IP addresses from other users and from channel admins
# (but not from server admins), while still allowing channel admins to ban

2
irc/authscript.go
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@ -84,7 +84,7 @@ type IPScriptOutput struct {
Error string `json:"error"`
}
func CheckIPBan(sem utils.Semaphore, config ScriptConfig, addr net.IP) (output IPScriptOutput, err error) {
func CheckIPBan(sem utils.Semaphore, config IPCheckScriptConfig, addr net.IP) (output IPScriptOutput, err error) {
if sem != nil {
sem.Acquire()
defer sem.Release()

7
irc/config.go
View File

@ -348,6 +348,11 @@ type AuthScriptConfig struct {
Autocreate bool
}
type IPCheckScriptConfig struct {
ScriptConfig `yaml:",inline"`
ExemptSASL bool `yaml:"exempt-sasl"`
}
// AccountRegistrationConfig controls account registration.
type AccountRegistrationConfig struct {
Enabled bool
@ -589,7 +594,7 @@ type Config struct {
Casemapping Casemapping
EnforceUtf8 bool `yaml:"enforce-utf8"`
OutputPath string `yaml:"output-path"`
IPCheckScript ScriptConfig `yaml:"ip-check-script"`
IPCheckScript IPCheckScriptConfig `yaml:"ip-check-script"`
OverrideServicesHostname string `yaml:"override-services-hostname"`
MaxLineLen int `yaml:"max-line-len"`
SuppressLusers bool `yaml:"suppress-lusers"`

29
irc/server.go
View File

@ -200,7 +200,7 @@ func (server *Server) checkBans(config *Config, ipaddr net.IP, checkScripts bool
server.logger.Warning("internal", "unexpected ban result", err.Error())
}
if checkScripts && config.Server.IPCheckScript.Enabled {
if checkScripts && config.Server.IPCheckScript.Enabled && !config.Server.IPCheckScript.ExemptSASL {
output, err := CheckIPBan(server.semaphores.IPCheckScript, config.Server.IPCheckScript, ipaddr)
if err != nil {
server.logger.Error("internal", "couldn't check IP ban script", ipaddr.String(), err.Error())
@ -267,9 +267,26 @@ func (server *Server) handleAlwaysOnExpirations() {
}
}
//
// server functionality
//
// handles server.ip-check-script.exempt-sasl:
// run the ip check script at the end of the handshake, only for anonymous connections
func (server *Server) checkBanScriptExemptSASL(config *Config, session *Session) (outcome AuthOutcome) {
// TODO add caching for this; see related code in (*server).checkBans;
// we should probably just put an LRU around this instead of using the DLINE system
ipaddr := session.IP()
output, err := CheckIPBan(server.semaphores.IPCheckScript, config.Server.IPCheckScript, ipaddr)
if err != nil {
server.logger.Error("internal", "couldn't check IP ban script", ipaddr.String(), err.Error())
return authSuccess
}
if output.Result == IPBanned || output.Result == IPRequireSASL {
server.logger.Info("connect-ip", "Rejecting unauthenticated client due to ip-check-script", ipaddr.String())
if output.BanMessage != "" {
session.client.requireSASLMessage = output.BanMessage
}
return authFailSaslRequired
}
return authSuccess
}
func (server *Server) tryRegister(c *Client, session *Session) (exiting bool) {
// XXX PROXY or WEBIRC MUST be sent as the first line of the session;
@ -294,6 +311,10 @@ func (server *Server) tryRegister(c *Client, session *Session) (exiting bool) {
// before completing the other registration commands
config := server.Config()
authOutcome := c.isAuthorized(server, config, session, c.requireSASL)
if authOutcome == authSuccess && c.account == "" &&
config.Server.IPCheckScript.Enabled && config.Server.IPCheckScript.ExemptSASL {
authOutcome = server.checkBanScriptExemptSASL(config, session)
}
var quitMessage string
switch authOutcome {
case authFailPass:

3
traditional.yaml
View File

@ -274,6 +274,9 @@ server:
kill-timeout: 1s
# how many scripts are allowed to run at once? 0 for no limit:
max-concurrency: 64
# if true, only check anonymous connections (not logged into an account)
# at the very end of the handshake:
exempt-sasl: false
# IP cloaking hides users' IP addresses from other users and from channel admins
# (but not from server admins), while still allowing channel admins to ban