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Handle session firewall using central config

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This commit is contained in:
Neil Alexander 2019-01-16 20:38:51 +00:00
parent fdf300a1ff
commit 9d5085492e
No known key found for this signature in database
GPG Key ID: A02A2019A2BB0944
2 changed files with 14 additions and 58 deletions
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9
src/yggdrasil/core.go
View File

@ -212,15 +212,6 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
return err
}
c.sessions.setSessionFirewallState(nc.SessionFirewall.Enable)
c.sessions.setSessionFirewallDefaults(
nc.SessionFirewall.AllowFromDirect,
nc.SessionFirewall.AllowFromRemote,
nc.SessionFirewall.AlwaysAllowOutbound,
)
c.sessions.setSessionFirewallWhitelist(nc.SessionFirewall.WhitelistEncryptionPublicKeys)
c.sessions.setSessionFirewallBlacklist(nc.SessionFirewall.BlacklistEncryptionPublicKeys)
if err := c.router.start(); err != nil {
c.log.Println("Failed to start router")
return err

63
src/yggdrasil/session.go
View File

@ -7,7 +7,6 @@ package yggdrasil
import (
"bytes"
"encoding/hex"
"sync"
"time"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
@ -115,14 +114,6 @@ type sessions struct {
byTheirPerm map[crypto.BoxPubKey]*crypto.Handle
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
sessionFirewallAlwaysAllowsOutbound bool
sessionFirewallWhitelist []string
sessionFirewallBlacklist []string
}
// Initializes the session struct.
@ -155,51 +146,28 @@ func (ss *sessions) init(core *Core) {
ss.lastCleanup = time.Now()
}
// Enable or disable the session firewall
func (ss *sessions) setSessionFirewallState(enabled bool) {
ss.sessionFirewallMutex.Lock()
defer ss.sessionFirewallMutex.Unlock()
ss.sessionFirewallEnabled = enabled
}
// Determines whether the session firewall is enabled.
func (ss *sessions) isSessionFirewallEnabled() bool {
ss.core.configMutex.RLock()
defer ss.core.configMutex.RUnlock()
// 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
}
// 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
return ss.core.config.SessionFirewall.Enable
}
// 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()
ss.core.configMutex.RLock()
defer ss.core.configMutex.RUnlock()
// Allow by default if the session firewall is disabled
if !ss.sessionFirewallEnabled {
if !ss.isSessionFirewallEnabled() {
return true
}
// Prepare for checking whitelist/blacklist
var box crypto.BoxPubKey
// Reject blacklisted nodes
for _, b := range ss.sessionFirewallBlacklist {
for _, b := range ss.core.config.SessionFirewall.BlacklistEncryptionPublicKeys {
key, err := hex.DecodeString(b)
if err == nil {
copy(box[:crypto.BoxPubKeyLen], key)
@ -209,7 +177,7 @@ func (ss *sessions) isSessionAllowed(pubkey *crypto.BoxPubKey, initiator bool) b
}
}
// Allow whitelisted nodes
for _, b := range ss.sessionFirewallWhitelist {
for _, b := range ss.core.config.SessionFirewall.WhitelistEncryptionPublicKeys {
key, err := hex.DecodeString(b)
if err == nil {
copy(box[:crypto.BoxPubKeyLen], key)
@ -219,7 +187,7 @@ func (ss *sessions) isSessionAllowed(pubkey *crypto.BoxPubKey, initiator bool) b
}
}
// Allow outbound sessions if appropriate
if ss.sessionFirewallAlwaysAllowsOutbound {
if ss.core.config.SessionFirewall.AlwaysAllowOutbound {
if initiator {
return true
}
@ -233,11 +201,11 @@ func (ss *sessions) isSessionAllowed(pubkey *crypto.BoxPubKey, initiator bool) b
}
}
// Allow direct peers if appropriate
if ss.sessionFirewallAllowsDirect && isDirectPeer {
if ss.core.config.SessionFirewall.AllowFromDirect && isDirectPeer {
return true
}
// Allow remote nodes if appropriate
if ss.sessionFirewallAllowsRemote && !isDirectPeer {
if ss.core.config.SessionFirewall.AllowFromRemote && !isDirectPeer {
return true
}
// Finally, default-deny if not matching any of the above rules
@ -474,14 +442,11 @@ 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 !isIn && ss.isSessionFirewallEnabled() {
if !ss.isSessionAllowed(&ping.SendPermPub, false) {
ss.sessionFirewallMutex.RUnlock()
return
}
}
ss.sessionFirewallMutex.RUnlock()
if !isIn || sinfo.timedout() {
if isIn {
sinfo.close()