mirror of
https://github.com/ergochat/ergo.git
synced 2024-11-10 22:19:31 +01:00
more permissive hostname validation
In particular, allow hostnames without periods (like on a LAN). This shouldn't be a client compability concern since we allow vhosts without periods.
This commit is contained in:
parent
4b37b5dd3e
commit
f1e2bbc0e4
@ -593,7 +593,7 @@ func LoadConfig(filename string) (config *Config, err error) {
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if config.Server.Name == "" {
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return nil, ErrServerNameMissing
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}
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if !utils.IsHostname(config.Server.Name) {
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if !utils.IsServerName(config.Server.Name) {
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return nil, ErrServerNameNotHostname
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}
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if config.Datastore.Path == "" {
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@ -6,6 +6,7 @@ package utils
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import (
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"net"
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"regexp"
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"strings"
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)
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@ -13,6 +14,8 @@ var (
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// subnet mask for an ipv6 /128:
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mask128 = net.CIDRMask(128, 128)
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IPv4LoopbackAddress = net.ParseIP("127.0.0.1").To16()
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validHostnameLabelRegexp = regexp.MustCompile(`^[0-9A-Za-z.\-]+$`)
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)
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// AddrIsLocal returns whether the address is from a trusted local connection (loopback or unix).
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@ -49,12 +52,10 @@ func IPStringToHostname(ipStr string) string {
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return ipStr
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}
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var allowedHostnameChars = "abcdefghijklmnopqrstuvwxyz1234567890-."
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// IsHostname returns whether we consider `name` a valid hostname.
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func IsHostname(name string) bool {
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// IRC hostnames specifically require a period
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if !strings.Contains(name, ".") || len(name) < 1 || len(name) > 253 {
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name = strings.TrimSuffix(name, ".")
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if len(name) < 1 || len(name) > 253 {
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return false
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}
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@ -63,11 +64,7 @@ func IsHostname(name string) bool {
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if len(part) < 1 || len(part) > 63 || strings.HasPrefix(part, "-") || strings.HasSuffix(part, "-") {
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return false
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}
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}
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// ensure all chars of hostname are valid
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for _, char := range strings.Split(strings.ToLower(name), "") {
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if !strings.Contains(allowedHostnameChars, char) {
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if !validHostnameLabelRegexp.MatchString(part) {
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return false
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}
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}
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@ -75,6 +72,12 @@ func IsHostname(name string) bool {
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return true
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}
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// IsServerName returns whether we consider `name` a valid IRC server name.
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func IsServerName(name string) bool {
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// IRC server names specifically require a period
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return IsHostname(name) && strings.IndexByte(name, '.') != -1
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}
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// Convenience to test whether `ip` is contained in any of `nets`.
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func IPInNets(ip net.IP, nets []net.IPNet) bool {
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for _, network := range nets {
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@ -24,14 +24,18 @@ var (
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"gsf.ds342.co.uk",
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"324.net.uk",
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"xn--bcher-kva.ch",
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"pentos",
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"pentos.",
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"www.google.com.",
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}
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badHostnames = []string{
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"-lol-.net.uk",
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"-lol.net.uk",
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"_irc._sctp.lol.net.uk",
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"irc",
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"com",
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"irc.l%l.net.uk",
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"irc..net.uk",
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".",
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"",
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}
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)
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@ -56,6 +60,15 @@ func TestIsHostname(t *testing.T) {
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}
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}
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func TestIsServerName(t *testing.T) {
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if IsServerName("pentos") {
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t.Error("irc server names must contain a period")
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}
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if !IsServerName("darwin.network") {
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t.Error("failed to validate a perfectly good server name")
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}
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}
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func TestNormalizeToNet(t *testing.T) {
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a := net.ParseIP("8.8.8.8")
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b := net.ParseIP("8.8.4.4")
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