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Reimplement get/setTunnelRouting, add/removeSourceSubnet, add/removeRoute, getRoutes, getSourceSubnets, make CKR threadsafe

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This commit is contained in:
Neil Alexander 2019-05-20 21:45:33 +01:00
parent 5b8d8a9341
commit 70774fc3de
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GPG Key ID: A02A2019A2BB0944
2 changed files with 158 additions and 127 deletions
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99
src/tuntap/admin.go
View File

@ -1,6 +1,13 @@
package tuntap
import "github.com/yggdrasil-network/yggdrasil-go/src/admin"
import (
"encoding/hex"
"errors"
"fmt"
"net"
"github.com/yggdrasil-network/yggdrasil-go/src/admin"
)
func (t *TunAdapter) SetupAdminHandlers(a *admin.AdminSocket) {
a.AddHandler("getTunTap", []string{}, func(in admin.Info) (r admin.Info, e error) {
@ -19,6 +26,8 @@ func (t *TunAdapter) SetupAdminHandlers(a *admin.AdminSocket) {
}, nil
})
/*
// TODO: rewrite this as I'm fairly sure it doesn't work right on many
// platforms anyway, but it may require changes to Water
a.AddHandler("setTunTap", []string{"name", "[tap_mode]", "[mtu]"}, func(in Info) (Info, error) {
// Set sane defaults
iftapmode := defaults.GetDefaults().DefaultIfTAPMode
@ -45,92 +54,66 @@ func (t *TunAdapter) SetupAdminHandlers(a *admin.AdminSocket) {
}, nil
}
})
a.AddHandler("getTunnelRouting", []string{}, func(in Info) (Info, error) {
enabled := false
a.core.router.doAdmin(func() {
enabled = a.core.router.cryptokey.isEnabled()
*/
a.AddHandler("getTunnelRouting", []string{}, func(in admin.Info) (admin.Info, error) {
return admin.Info{"enabled": t.ckr.isEnabled()}, nil
})
return Info{"enabled": enabled}, nil
})
a.AddHandler("setTunnelRouting", []string{"enabled"}, func(in Info) (Info, error) {
a.AddHandler("setTunnelRouting", []string{"enabled"}, func(in admin.Info) (admin.Info, error) {
enabled := false
if e, ok := in["enabled"].(bool); ok {
enabled = e
}
a.core.router.doAdmin(func() {
a.core.router.cryptokey.setEnabled(enabled)
t.ckr.setEnabled(enabled)
return admin.Info{"enabled": enabled}, nil
})
return Info{"enabled": enabled}, nil
})
a.AddHandler("addSourceSubnet", []string{"subnet"}, func(in Info) (Info, error) {
var err error
a.core.router.doAdmin(func() {
err = a.core.router.cryptokey.addSourceSubnet(in["subnet"].(string))
})
if err == nil {
return Info{"added": []string{in["subnet"].(string)}}, nil
a.AddHandler("addSourceSubnet", []string{"subnet"}, func(in admin.Info) (admin.Info, error) {
if err := t.ckr.addSourceSubnet(in["subnet"].(string)); err == nil {
return admin.Info{"added": []string{in["subnet"].(string)}}, nil
} else {
return Info{"not_added": []string{in["subnet"].(string)}}, errors.New("Failed to add source subnet")
return admin.Info{"not_added": []string{in["subnet"].(string)}}, errors.New("Failed to add source subnet")
}
})
a.AddHandler("addRoute", []string{"subnet", "box_pub_key"}, func(in Info) (Info, error) {
var err error
a.core.router.doAdmin(func() {
err = a.core.router.cryptokey.addRoute(in["subnet"].(string), in["box_pub_key"].(string))
})
if err == nil {
return Info{"added": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, nil
a.AddHandler("addRoute", []string{"subnet", "box_pub_key"}, func(in admin.Info) (admin.Info, error) {
if err := t.ckr.addRoute(in["subnet"].(string), in["box_pub_key"].(string)); err == nil {
return admin.Info{"added": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, nil
} else {
return Info{"not_added": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, errors.New("Failed to add route")
return admin.Info{"not_added": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, errors.New("Failed to add route")
}
})
a.AddHandler("getSourceSubnets", []string{}, func(in Info) (Info, error) {
a.AddHandler("getSourceSubnets", []string{}, func(in admin.Info) (admin.Info, error) {
var subnets []string
a.core.router.doAdmin(func() {
getSourceSubnets := func(snets []net.IPNet) {
for _, subnet := range snets {
subnets = append(subnets, subnet.String())
}
}
getSourceSubnets(a.core.router.cryptokey.ipv4sources)
getSourceSubnets(a.core.router.cryptokey.ipv6sources)
getSourceSubnets(t.ckr.ipv4sources)
getSourceSubnets(t.ckr.ipv6sources)
return admin.Info{"source_subnets": subnets}, nil
})
return Info{"source_subnets": subnets}, nil
})
a.AddHandler("getRoutes", []string{}, func(in Info) (Info, error) {
routes := make(Info)
a.core.router.doAdmin(func() {
a.AddHandler("getRoutes", []string{}, func(in admin.Info) (admin.Info, error) {
routes := make(admin.Info)
getRoutes := func(ckrs []cryptokey_route) {
for _, ckr := range ckrs {
routes[ckr.subnet.String()] = hex.EncodeToString(ckr.destination[:])
}
}
getRoutes(a.core.router.cryptokey.ipv4routes)
getRoutes(a.core.router.cryptokey.ipv6routes)
getRoutes(t.ckr.ipv4routes)
getRoutes(t.ckr.ipv6routes)
return admin.Info{"routes": routes}, nil
})
return Info{"routes": routes}, nil
})
a.AddHandler("removeSourceSubnet", []string{"subnet"}, func(in Info) (Info, error) {
var err error
a.core.router.doAdmin(func() {
err = a.core.router.cryptokey.removeSourceSubnet(in["subnet"].(string))
})
if err == nil {
return Info{"removed": []string{in["subnet"].(string)}}, nil
a.AddHandler("removeSourceSubnet", []string{"subnet"}, func(in admin.Info) (admin.Info, error) {
if err := t.ckr.removeSourceSubnet(in["subnet"].(string)); err == nil {
return admin.Info{"removed": []string{in["subnet"].(string)}}, nil
} else {
return Info{"not_removed": []string{in["subnet"].(string)}}, errors.New("Failed to remove source subnet")
return admin.Info{"not_removed": []string{in["subnet"].(string)}}, errors.New("Failed to remove source subnet")
}
})
a.AddHandler("removeRoute", []string{"subnet", "box_pub_key"}, func(in Info) (Info, error) {
var err error
a.core.router.doAdmin(func() {
err = a.core.router.cryptokey.removeRoute(in["subnet"].(string), in["box_pub_key"].(string))
})
if err == nil {
return Info{"removed": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, nil
a.AddHandler("removeRoute", []string{"subnet", "box_pub_key"}, func(in admin.Info) (admin.Info, error) {
if err := t.ckr.removeRoute(in["subnet"].(string), in["box_pub_key"].(string)); err == nil {
return admin.Info{"removed": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, nil
} else {
return Info{"not_removed": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, errors.New("Failed to remove route")
return admin.Info{"not_removed": []string{fmt.Sprintf("%s via %s", in["subnet"].(string), in["box_pub_key"].(string))}}, errors.New("Failed to remove route")
}
})
*/
}

60
src/tuntap/ckr.go
View File

@ -7,6 +7,8 @@ import (
"fmt"
"net"
"sort"
"sync"
"sync/atomic"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
@ -17,7 +19,7 @@ import (
type cryptokey struct {
tun *TunAdapter
enabled bool
enabled atomic.Value // bool
reconfigure chan chan error
ipv4routes []cryptokey_route
ipv6routes []cryptokey_route
@ -25,6 +27,9 @@ type cryptokey struct {
ipv6cache map[address.Address]cryptokey_route
ipv4sources []net.IPNet
ipv6sources []net.IPNet
mutexroutes sync.RWMutex
mutexcaches sync.RWMutex
mutexsources sync.RWMutex
}
type cryptokey_route struct {
@ -58,8 +63,10 @@ func (c *cryptokey) configure() error {
c.setEnabled(c.tun.config.Current.TunnelRouting.Enable)
// Clear out existing routes
c.mutexroutes.Lock()
c.ipv6routes = make([]cryptokey_route, 0)
c.ipv4routes = make([]cryptokey_route, 0)
c.mutexroutes.Unlock()
// Add IPv6 routes
for ipv6, pubkey := range c.tun.config.Current.TunnelRouting.IPv6Destinations {
@ -76,8 +83,10 @@ func (c *cryptokey) configure() error {
}
// Clear out existing sources
c.mutexsources.Lock()
c.ipv6sources = make([]net.IPNet, 0)
c.ipv4sources = make([]net.IPNet, 0)
c.mutexsources.Unlock()
// Add IPv6 sources
c.ipv6sources = make([]net.IPNet, 0)
@ -96,26 +105,31 @@ func (c *cryptokey) configure() error {
}
// Wipe the caches
c.mutexcaches.Lock()
c.ipv4cache = make(map[address.Address]cryptokey_route, 0)
c.ipv6cache = make(map[address.Address]cryptokey_route, 0)
c.mutexcaches.Unlock()
return nil
}
// Enable or disable crypto-key routing.
func (c *cryptokey) setEnabled(enabled bool) {
c.enabled = enabled
c.enabled.Store(true)
}
// Check if crypto-key routing is enabled.
func (c *cryptokey) isEnabled() bool {
return c.enabled
return c.enabled.Load().(bool)
}
// Check whether the given address (with the address length specified in bytes)
// matches either the current node's address, the node's routed subnet or the
// list of subnets specified in IPv4Sources/IPv6Sources.
func (c *cryptokey) isValidSource(addr address.Address, addrlen int) bool {
c.mutexsources.RLock()
defer c.mutexsources.RUnlock()
ip := net.IP(addr[:addrlen])
if addrlen == net.IPv6len {
@ -158,6 +172,9 @@ func (c *cryptokey) isValidSource(addr address.Address, addrlen int) bool {
// Adds a source subnet, which allows traffic with these source addresses to
// be tunnelled using crypto-key routing.
func (c *cryptokey) addSourceSubnet(cidr string) error {
c.mutexsources.Lock()
defer c.mutexsources.Unlock()
// Is the CIDR we've been given valid?
_, ipnet, err := net.ParseCIDR(cidr)
if err != nil {
@ -195,6 +212,11 @@ func (c *cryptokey) addSourceSubnet(cidr string) error {
// Adds a destination route for the given CIDR to be tunnelled to the node
// with the given BoxPubKey.
func (c *cryptokey) addRoute(cidr string, dest string) error {
c.mutexroutes.Lock()
c.mutexcaches.Lock()
defer c.mutexroutes.Unlock()
defer c.mutexcaches.Unlock()
// Is the CIDR we've been given valid?
ipaddr, ipnet, err := net.ParseCIDR(cidr)
if err != nil {
@ -269,6 +291,8 @@ func (c *cryptokey) addRoute(cidr string, dest string) error {
// length specified in bytes) from the crypto-key routing table. An error is
// returned if the address is not suitable or no route was found.
func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (crypto.BoxPubKey, error) {
c.mutexcaches.RLock()
// Check if the address is a valid Yggdrasil address - if so it
// is exempt from all CKR checking
if addr.IsValid() {
@ -281,10 +305,8 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
// Check if the prefix is IPv4 or IPv6
if addrlen == net.IPv6len {
routingtable = &c.ipv6routes
routingcache = &c.ipv6cache
} else if addrlen == net.IPv4len {
routingtable = &c.ipv4routes
routingcache = &c.ipv4cache
} else {
return crypto.BoxPubKey{}, errors.New("Unexpected prefix size")
@ -292,9 +314,24 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
// Check if there's a cache entry for this addr
if route, ok := (*routingcache)[addr]; ok {
c.mutexcaches.RUnlock()
return route.destination, nil
}
c.mutexcaches.RUnlock()
c.mutexroutes.RLock()
defer c.mutexroutes.RUnlock()
// Check if the prefix is IPv4 or IPv6
if addrlen == net.IPv6len {
routingtable = &c.ipv6routes
} else if addrlen == net.IPv4len {
routingtable = &c.ipv4routes
} else {
return crypto.BoxPubKey{}, errors.New("Unexpected prefix size")
}
// No cache was found - start by converting the address into a net.IP
ip := make(net.IP, addrlen)
copy(ip[:addrlen], addr[:])
@ -304,6 +341,9 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
for _, route := range *routingtable {
// Does this subnet match the given IP?
if route.subnet.Contains(ip) {
c.mutexcaches.Lock()
defer c.mutexcaches.Unlock()
// Check if the routing cache is above a certain size, if it is evict
// a random entry so we can make room for this one. We take advantage
// of the fact that the iteration order is random here
@ -329,6 +369,9 @@ func (c *cryptokey) getPublicKeyForAddress(addr address.Address, addrlen int) (c
// Removes a source subnet, which allows traffic with these source addresses to
// be tunnelled using crypto-key routing.
func (c *cryptokey) removeSourceSubnet(cidr string) error {
c.mutexsources.Lock()
defer c.mutexsources.Unlock()
// Is the CIDR we've been given valid?
_, ipnet, err := net.ParseCIDR(cidr)
if err != nil {
@ -364,6 +407,11 @@ func (c *cryptokey) removeSourceSubnet(cidr string) error {
// Removes a destination route for the given CIDR to be tunnelled to the node
// with the given BoxPubKey.
func (c *cryptokey) removeRoute(cidr string, dest string) error {
c.mutexroutes.Lock()
c.mutexcaches.Lock()
defer c.mutexroutes.Unlock()
defer c.mutexcaches.Unlock()
// Is the CIDR we've been given valid?
_, ipnet, err := net.ParseCIDR(cidr)
if err != nil {
@ -403,7 +451,7 @@ func (c *cryptokey) removeRoute(cidr string, dest string) error {
for k := range *routingcache {
delete(*routingcache, k)
}
c.tun.log.Infoln("Removed CKR destination subnet %s via %s\n", cidr, dest)
c.tun.log.Infof("Removed CKR destination subnet %s via %s\n", cidr, dest)
return nil
}
}