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hostname: normalize before validation

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Apply NormaliseHostname() before ValidateHostname() in ApplyHostnameFromHostInfo()
and EnsureHostname() to sanitize hostnames with minor invalid characters instead
of replacing them with generic identifiers like "invalid-abc123".

This allows hostnames like "My-PC!" to become "my-pc" rather than being rejected.

Fixes #2926
This commit is contained in:
griffer 2025-12-19 08:17:31 +01:00
parent 7be20912f5
commit 91711ec234
2 changed files with 16 additions and 8 deletions
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16
hscontrol/types/node.go
View file

@ -585,17 +585,25 @@ func (node *Node) ApplyHostnameFromHostInfo(hostInfo *tailcfg.Hostinfo) {
return
}
newHostname := strings.ToLower(hostInfo.Hostname)
if err := util.ValidateHostname(newHostname); err != nil {
newHostname, err := util.NormaliseHostname(hostInfo.Hostname)
if err != nil {
log.Warn().
Str("node.id", node.ID.String()).
Str("current_hostname", node.Hostname).
Str("rejected_hostname", hostInfo.Hostname).
Str("original_hostname", hostInfo.Hostname).
Err(err).
Msg("Rejecting invalid hostname update from hostinfo")
Msg("Hostname normalization failed, keeping current hostname")
return
}
if hostInfo.Hostname != newHostname {
log.Info().
Str("node.id", node.ID.String()).
Str("original", hostInfo.Hostname).
Str("sanitized", newHostname).
Msg("Hostname sanitized during update")
}
if node.Hostname != newHostname {
log.Trace().
Str("node.id", node.ID.String()).

8
hscontrol/util/util.go
View file

@ -287,12 +287,12 @@ func EnsureHostname(hostinfo *tailcfg.Hostinfo, machineKey, nodeKey string) stri
return fmt.Sprintf("node-%s", keyPrefix)
}
lowercased := strings.ToLower(hostinfo.Hostname)
if err := ValidateHostname(lowercased); err == nil {
return lowercased
normalized, err := NormaliseHostname(hostinfo.Hostname)
if err != nil {
return InvalidString()
}
return InvalidString()
return normalized
}
// GenerateRegistrationKey generates a vanity key for tracking web authentication