nebula/allow_list.go

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Add lighthouse.{remoteAllowList,localAllowList} (#217) These settings make it possible to blacklist / whitelist IP addresses that are used for remote connections. `lighthouse.remoteAllowList` filters which remote IPs are allow when fetching from the lighthouse (or, if you are the lighthouse, which IPs you store and forward to querying hosts). By default, any remote IPs are allowed. You can provide CIDRs here with `true` to allow and `false` to deny. The most specific CIDR rule applies to each remote. If all rules are "allow", the default will be "deny", and vice-versa. If both "allow" and "deny" rules are present, then you MUST set a rule for "0.0.0.0/0" as the default. lighthouse: remoteAllowList: # Example to block IPs from this subnet from being used for remote IPs. "172.16.0.0/12": false # A more complicated example, allow public IPs but only private IPs from a specific subnet "0.0.0.0/0": true "10.0.0.0/8": false "10.42.42.0/24": true `lighthouse.localAllowList` has the same logic as above, but it applies to the local addresses we advertise to the lighthouse. Additionally, you can specify an `interfaces` map of regular expressions to match against interface names. The regexp must match the entire name. All interface rules must be either true or false (and the default rule will be the inverse). CIDR rules are matched after interface name rules. Default is all local IP addresses. lighthouse: localAllowList: # Example to blacklist docker interfaces. interfaces: 'docker.*': false # Example to only advertise IPs in this subnet to the lighthouse. "10.0.0.0/8": true
2020-04-08 21:36:43 +02:00
package nebula
import (
"fmt"
"regexp"
)
type AllowList struct {
// The values of this cidrTree are `bool`, signifying allow/deny
cidrTree *CIDRTree
// To avoid ambiguity, all rules must be true, or all rules must be false.
nameRules []AllowListNameRule
}
type AllowListNameRule struct {
Name *regexp.Regexp
Allow bool
}
func (al *AllowList) Allow(ip uint32) bool {
if al == nil {
return true
}
result := al.cidrTree.MostSpecificContains(ip)
switch v := result.(type) {
case bool:
return v
default:
panic(fmt.Errorf("invalid state, allowlist returned: %T %v", result, result))
}
}
func (al *AllowList) AllowName(name string) bool {
if al == nil || len(al.nameRules) == 0 {
return true
}
for _, rule := range al.nameRules {
if rule.Name.MatchString(name) {
return rule.Allow
}
}
// If no rules match, return the default, which is the inverse of the rules
return !al.nameRules[0].Allow
}