cwinfo/yggdrasil-go
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Make session firewall thread-safe for config updates

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This commit is contained in:
Neil Alexander 2019-01-14 18:24:35 +00:00
parent bd04124e43
commit 51026d762e
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GPG Key ID: A02A2019A2BB0944
1 changed files with 18 additions and 4 deletions
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18
src/yggdrasil/session.go
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@ -7,6 +7,7 @@ package yggdrasil
import (
"bytes"
"encoding/hex"
"sync"
"time"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
@ -115,6 +116,7 @@ type sessions struct {
addrToPerm map[address.Address]*crypto.BoxPubKey
subnetToPerm map[address.Subnet]*crypto.BoxPubKey
// Options from the session firewall
sessionFirewallMutex sync.RWMutex
sessionFirewallEnabled bool
sessionFirewallAllowsDirect bool
sessionFirewallAllowsRemote bool
@ -157,12 +159,16 @@ func (ss *sessions) init(core *Core) {
// Enable or disable the session firewall
func (ss *sessions) setSessionFirewallState(enabled bool) {
ss.sessionFirewallMutex.Lock()
defer ss.sessionFirewallMutex.Unlock()
ss.sessionFirewallEnabled = enabled
}
// Set the session firewall defaults (first parameter is whether to allow
// sessions from direct peers, second is whether to allow from remote nodes).
func (ss *sessions) setSessionFirewallDefaults(allowsDirect bool, allowsRemote bool, alwaysAllowsOutbound bool) {
ss.sessionFirewallMutex.Lock()
defer ss.sessionFirewallMutex.Unlock()
ss.sessionFirewallAllowsDirect = allowsDirect
ss.sessionFirewallAllowsRemote = allowsRemote
ss.sessionFirewallAlwaysAllowsOutbound = alwaysAllowsOutbound
@ -170,17 +176,24 @@ func (ss *sessions) setSessionFirewallDefaults(allowsDirect bool, allowsRemote b
// Set the session firewall whitelist - nodes always allowed to open sessions.
func (ss *sessions) setSessionFirewallWhitelist(whitelist []string) {
ss.sessionFirewallMutex.Lock()
defer ss.sessionFirewallMutex.Unlock()
ss.sessionFirewallWhitelist = whitelist
}
// Set the session firewall blacklist - nodes never allowed to open sessions.
func (ss *sessions) setSessionFirewallBlacklist(blacklist []string) {
ss.sessionFirewallMutex.Lock()
defer ss.sessionFirewallMutex.Unlock()
ss.sessionFirewallBlacklist = blacklist
}
// Determines whether the session with a given publickey is allowed based on
// session firewall rules.
func (ss *sessions) isSessionAllowed(pubkey *crypto.BoxPubKey, initiator bool) bool {
ss.sessionFirewallMutex.RLock()
defer ss.sessionFirewallMutex.RUnlock()
// Allow by default if the session firewall is disabled
if !ss.sessionFirewallEnabled {
return true
@ -286,11 +299,9 @@ func (ss *sessions) getByTheirSubnet(snet *address.Subnet) (*sessionInfo, bool)
// Creates a new session and lazily cleans up old/timedout existing sessions.
// This includse initializing session info to sane defaults (e.g. lowest supported MTU).
func (ss *sessions) createSession(theirPermKey *crypto.BoxPubKey) *sessionInfo {
if ss.sessionFirewallEnabled {
if !ss.isSessionAllowed(theirPermKey, true) {
return nil
}
}
sinfo := sessionInfo{}
sinfo.core = ss.core
sinfo.reconfigure = make(chan chan error, 1)
@ -465,11 +476,14 @@ func (ss *sessions) handlePing(ping *sessionPing) {
// Get the corresponding session (or create a new session)
sinfo, isIn := ss.getByTheirPerm(&ping.SendPermPub)
// Check the session firewall
ss.sessionFirewallMutex.RLock()
if !isIn && ss.sessionFirewallEnabled {
if !ss.isSessionAllowed(&ping.SendPermPub, false) {
ss.sessionFirewallMutex.RUnlock()
return
}
}
ss.sessionFirewallMutex.RUnlock()
if !isIn || sinfo.timedout() {
if isIn {
sinfo.close()