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control/controlclient: don't accept /32 routes without --accept-routes

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Fixes tailscale/corp#500

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2020-09-15 10:00:23 -07:00 committed by Brad Fitzpatrick
parent 88107b1287
commit 761fe19e5f
1 changed files with 24 additions and 1 deletions
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25
control/controlclient/netmap.go
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@ -273,7 +273,7 @@ func (nm *NetworkMap) WGCfg(logf logger.Logf, flags WGConfigFlags) (*wgcfg.Confi
logf("wgcfg: %v skipping default route", peer.Key.ShortString())
continue
}
} else if allowedIP.Mask < 32 {
} else if cidrIsSubnet(peer, allowedIP) {
if (flags & AllowSubnetRoutes) == 0 {
logf("wgcfg: %v skipping subnet route", peer.Key.ShortString())
continue
@ -286,6 +286,29 @@ func (nm *NetworkMap) WGCfg(logf logger.Logf, flags WGConfigFlags) (*wgcfg.Confi
return cfg, nil
}
// cidrIsSubnet reports whether cidr is a non-default-route subnet
// exported by node that is not one of its own self addresses.
func cidrIsSubnet(node *tailcfg.Node, cidr wgcfg.CIDR) bool {
if cidr.Mask == 0 {
return false
}
if cidr.Mask < 32 {
// Fast path for IPv4, to avoid loop below.
//
// TODO: if cidr.IP is an IPv6 address, we could do "< 128"
// to avoid the range over node.Addresses. Or we could
// just remove this fast path and unconditionally do the range
// loop.
return true
}
for _, selfCIDR := range node.Addresses {
if cidr == selfCIDR {
return false
}
}
return true
}
func appendEndpoint(peer *wgcfg.Peer, epStr string) error {
if epStr == "" {
return nil