mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-12 23:20:28 +00:00
Merge pull request #432 from neilalexander/gatekeeper
Implement session gatekeeper functions
This commit is contained in:
commit
2fd3ac6837
@ -2,6 +2,7 @@ package main
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import (
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"bytes"
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"encoding/hex"
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"encoding/json"
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"flag"
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"fmt"
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@ -20,22 +21,21 @@ import (
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"github.com/yggdrasil-network/yggdrasil-go/src/admin"
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"github.com/yggdrasil-network/yggdrasil-go/src/config"
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"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
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"github.com/yggdrasil-network/yggdrasil-go/src/multicast"
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"github.com/yggdrasil-network/yggdrasil-go/src/tuntap"
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"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
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)
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type nodeConfig = config.NodeConfig
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type Core = yggdrasil.Core
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type node struct {
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core Core
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core yggdrasil.Core
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state *config.NodeState
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tuntap tuntap.TunAdapter
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multicast multicast.Multicast
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admin admin.AdminSocket
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}
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func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *nodeConfig {
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func readConfig(useconf *bool, useconffile *string, normaliseconf *bool) *config.NodeConfig {
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// Use a configuration file. If -useconf, the configuration will be read
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// from stdin. If -useconffile, the configuration will be read from the
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// filesystem.
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@ -116,7 +116,7 @@ func main() {
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logging := flag.String("logging", "info,warn,error", "comma-separated list of logging levels to enable")
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flag.Parse()
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var cfg *nodeConfig
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var cfg *config.NodeConfig
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var err error
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switch {
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case *version:
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@ -181,18 +181,20 @@ func main() {
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n := node{}
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// Now start Yggdrasil - this starts the DHT, router, switch and other core
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// components needed for Yggdrasil to operate
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state, err := n.core.Start(cfg, logger)
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n.state, err = n.core.Start(cfg, logger)
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if err != nil {
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logger.Errorln("An error occurred during startup")
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panic(err)
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}
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// Register the session firewall gatekeeper function
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n.core.SetSessionGatekeeper(n.sessionFirewall)
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// Start the admin socket
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n.admin.Init(&n.core, state, logger, nil)
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n.admin.Init(&n.core, n.state, logger, nil)
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if err := n.admin.Start(); err != nil {
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logger.Errorln("An error occurred starting admin socket:", err)
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}
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// Start the multicast interface
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n.multicast.Init(&n.core, state, logger, nil)
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n.multicast.Init(&n.core, n.state, logger, nil)
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if err := n.multicast.Start(); err != nil {
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logger.Errorln("An error occurred starting multicast:", err)
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}
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@ -200,7 +202,7 @@ func main() {
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// Start the TUN/TAP interface
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if listener, err := n.core.ConnListen(); err == nil {
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if dialer, err := n.core.ConnDialer(); err == nil {
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n.tuntap.Init(state, logger, listener, dialer)
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n.tuntap.Init(n.state, logger, listener, dialer)
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if err := n.tuntap.Start(); err != nil {
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logger.Errorln("An error occurred starting TUN/TAP:", err)
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}
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@ -251,3 +253,66 @@ func main() {
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}
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exit:
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}
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func (n *node) sessionFirewall(pubkey *crypto.BoxPubKey, initiator bool) bool {
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n.state.Mutex.RLock()
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defer n.state.Mutex.RUnlock()
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// Allow by default if the session firewall is disabled
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if !n.state.Current.SessionFirewall.Enable {
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return true
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}
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// Prepare for checking whitelist/blacklist
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var box crypto.BoxPubKey
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// Reject blacklisted nodes
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for _, b := range n.state.Current.SessionFirewall.BlacklistEncryptionPublicKeys {
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key, err := hex.DecodeString(b)
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if err == nil {
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copy(box[:crypto.BoxPubKeyLen], key)
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if box == *pubkey {
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return false
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}
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}
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}
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// Allow whitelisted nodes
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for _, b := range n.state.Current.SessionFirewall.WhitelistEncryptionPublicKeys {
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key, err := hex.DecodeString(b)
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if err == nil {
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copy(box[:crypto.BoxPubKeyLen], key)
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if box == *pubkey {
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return true
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}
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}
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}
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// Allow outbound sessions if appropriate
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if n.state.Current.SessionFirewall.AlwaysAllowOutbound {
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if initiator {
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return true
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}
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}
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// Look and see if the pubkey is that of a direct peer
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var isDirectPeer bool
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for _, peer := range n.core.GetPeers() {
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if peer.PublicKey == *pubkey {
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isDirectPeer = true
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break
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}
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}
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// Allow direct peers if appropriate
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if n.state.Current.SessionFirewall.AllowFromDirect && isDirectPeer {
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return true
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}
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// Allow remote nodes if appropriate
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if n.state.Current.SessionFirewall.AllowFromRemote && !isDirectPeer {
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return true
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}
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// Finally, default-deny if not matching any of the above rules
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return false
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}
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@ -395,6 +395,19 @@ func (c *Core) GetNodeInfo(keyString, coordString string, nocache bool) (NodeInf
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return NodeInfoPayload{}, errors.New(fmt.Sprintf("getNodeInfo timeout: %s", keyString))
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}
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// SetSessionGatekeeper allows you to configure a handler function for deciding
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// whether a session should be allowed or not. The default session firewall is
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// implemented in this way. The function receives the public key of the remote
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// side and a boolean which is true if we initiated the session or false if we
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// received an incoming session request. The function should return true to
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// allow the session or false to reject it.
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func (c *Core) SetSessionGatekeeper(f func(pubkey *crypto.BoxPubKey, initiator bool) bool) {
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c.sessions.isAllowedMutex.Lock()
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defer c.sessions.isAllowedMutex.Unlock()
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c.sessions.isAllowedHandler = f
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}
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// SetLogger sets the output logger of the Yggdrasil node after startup. This
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// may be useful if you want to redirect the output later.
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func (c *Core) SetLogger(log *log.Logger) {
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@ -6,7 +6,6 @@ package yggdrasil
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import (
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"bytes"
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"encoding/hex"
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"sync"
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"time"
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@ -111,18 +110,20 @@ func (s *sessionInfo) update(p *sessionPing) bool {
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// Sessions are indexed by handle.
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// Additionally, stores maps of address/subnet onto keys, and keys onto handles.
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type sessions struct {
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core *Core
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listener *Listener
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listenerMutex sync.Mutex
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reconfigure chan chan error
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lastCleanup time.Time
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permShared map[crypto.BoxPubKey]*crypto.BoxSharedKey // Maps known permanent keys to their shared key, used by DHT a lot
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sinfos map[crypto.Handle]*sessionInfo // Maps (secret) handle onto session info
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conns map[crypto.Handle]*Conn // Maps (secret) handle onto connections
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byMySes map[crypto.BoxPubKey]*crypto.Handle // Maps mySesPub onto handle
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byTheirPerm map[crypto.BoxPubKey]*crypto.Handle // Maps theirPermPub onto handle
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addrToPerm map[address.Address]*crypto.BoxPubKey
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subnetToPerm map[address.Subnet]*crypto.BoxPubKey
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core *Core
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listener *Listener
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listenerMutex sync.Mutex
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reconfigure chan chan error
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lastCleanup time.Time
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isAllowedHandler func(pubkey *crypto.BoxPubKey, initiator bool) bool // Returns true or false if session setup is allowed
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isAllowedMutex sync.RWMutex // Protects the above
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permShared map[crypto.BoxPubKey]*crypto.BoxSharedKey // Maps known permanent keys to their shared key, used by DHT a lot
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sinfos map[crypto.Handle]*sessionInfo // Maps (secret) handle onto session info
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conns map[crypto.Handle]*Conn // Maps (secret) handle onto connections
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byMySes map[crypto.BoxPubKey]*crypto.Handle // Maps mySesPub onto handle
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byTheirPerm map[crypto.BoxPubKey]*crypto.Handle // Maps theirPermPub onto handle
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addrToPerm map[address.Address]*crypto.BoxPubKey
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subnetToPerm map[address.Subnet]*crypto.BoxPubKey
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}
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// Initializes the session struct.
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@ -155,70 +156,17 @@ func (ss *sessions) init(core *Core) {
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ss.lastCleanup = time.Now()
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}
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// Determines whether the session firewall is enabled.
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func (ss *sessions) isSessionFirewallEnabled() bool {
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ss.core.config.Mutex.RLock()
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defer ss.core.config.Mutex.RUnlock()
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return ss.core.config.Current.SessionFirewall.Enable
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}
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// Determines whether the session with a given publickey is allowed based on
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// session firewall rules.
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func (ss *sessions) isSessionAllowed(pubkey *crypto.BoxPubKey, initiator bool) bool {
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ss.core.config.Mutex.RLock()
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defer ss.core.config.Mutex.RUnlock()
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ss.isAllowedMutex.RLock()
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defer ss.isAllowedMutex.RUnlock()
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// Allow by default if the session firewall is disabled
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if !ss.isSessionFirewallEnabled() {
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if ss.isAllowedHandler == nil {
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return true
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}
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// Prepare for checking whitelist/blacklist
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var box crypto.BoxPubKey
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// Reject blacklisted nodes
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for _, b := range ss.core.config.Current.SessionFirewall.BlacklistEncryptionPublicKeys {
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key, err := hex.DecodeString(b)
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if err == nil {
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copy(box[:crypto.BoxPubKeyLen], key)
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if box == *pubkey {
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return false
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}
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}
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}
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// Allow whitelisted nodes
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for _, b := range ss.core.config.Current.SessionFirewall.WhitelistEncryptionPublicKeys {
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key, err := hex.DecodeString(b)
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if err == nil {
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copy(box[:crypto.BoxPubKeyLen], key)
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if box == *pubkey {
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return true
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}
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}
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}
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// Allow outbound sessions if appropriate
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if ss.core.config.Current.SessionFirewall.AlwaysAllowOutbound {
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if initiator {
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return true
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}
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}
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// Look and see if the pubkey is that of a direct peer
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var isDirectPeer bool
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for _, peer := range ss.core.peers.ports.Load().(map[switchPort]*peer) {
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if peer.box == *pubkey {
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isDirectPeer = true
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break
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}
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}
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// Allow direct peers if appropriate
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if ss.core.config.Current.SessionFirewall.AllowFromDirect && isDirectPeer {
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return true
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}
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// Allow remote nodes if appropriate
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if ss.core.config.Current.SessionFirewall.AllowFromRemote && !isDirectPeer {
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return true
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}
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// Finally, default-deny if not matching any of the above rules
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return false
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return ss.isAllowedHandler(pubkey, initiator)
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}
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// Gets the session corresponding to a given handle.
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@ -271,6 +219,7 @@ func (ss *sessions) getByTheirSubnet(snet *address.Subnet) (*sessionInfo, bool)
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// includse initializing session info to sane defaults (e.g. lowest supported
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// MTU).
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func (ss *sessions) createSession(theirPermKey *crypto.BoxPubKey) *sessionInfo {
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// TODO: this check definitely needs to be moved
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if !ss.isSessionAllowed(theirPermKey, true) {
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return nil
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}
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@ -444,12 +393,12 @@ func (ss *sessions) sendPingPong(sinfo *sessionInfo, isPong bool) {
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func (ss *sessions) handlePing(ping *sessionPing) {
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// Get the corresponding session (or create a new session)
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sinfo, isIn := ss.getByTheirPerm(&ping.SendPermPub)
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// Check the session firewall
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if !isIn && ss.isSessionFirewallEnabled() {
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if !ss.isSessionAllowed(&ping.SendPermPub, false) {
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return
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}
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// Check if the session is allowed
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// TODO: this check may need to be moved
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if !isIn && !ss.isSessionAllowed(&ping.SendPermPub, false) {
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return
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}
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// Create the session if it doesn't already exist
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if !isIn {
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ss.createSession(&ping.SendPermPub)
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sinfo, isIn = ss.getByTheirPerm(&ping.SendPermPub)
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