Make more variables safe for use in invitations.

When writing one's own invitation files, more variables are now accepted
by the invitee. The goal is to allow anything that doesn't interfere
with the existing network configuration of the invitee and that doesn't
cause any unexpected behaviour, such as starting running commands.

diff --git a/src/tincctl.c b/src/tincctl.c
index 8181dd9..b2062b2 100644 (file)
--- a/src/tincctl.c
+++ b/src/tincctl.c
@@ -1717,18 +1717,18 @@ ecdsa_t *get_pubkey(FILE *f) {
 
 const var_t variables[] = {
        /* Server configuration */
-       {"AddressFamily", VAR_SERVER},
+       {"AddressFamily", VAR_SERVER | VAR_SAFE},
        {"AutoConnect", VAR_SERVER | VAR_SAFE},
        {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
        {"BindToInterface", VAR_SERVER},
        {"Broadcast", VAR_SERVER | VAR_SAFE},
        {"BroadcastSubnet", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
        {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
-       {"DecrementTTL", VAR_SERVER},
+       {"DecrementTTL", VAR_SERVER | VAR_SAFE},
        {"Device", VAR_SERVER},
        {"DeviceStandby", VAR_SERVER},
        {"DeviceType", VAR_SERVER},
-       {"DirectOnly", VAR_SERVER},
+       {"DirectOnly", VAR_SERVER | VAR_SAFE},
        {"Ed25519PrivateKeyFile", VAR_SERVER},
        {"ExperimentalProtocol", VAR_SERVER},
        {"Forwarding", VAR_SERVER},
@@ -1738,34 +1738,34 @@ const var_t variables[] = {
        {"IffOneQueue", VAR_SERVER},
        {"Interface", VAR_SERVER},
        {"InvitationExpire", VAR_SERVER},
-       {"KeyExpire", VAR_SERVER},
+       {"KeyExpire", VAR_SERVER | VAR_SAFE},
        {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
-       {"LocalDiscovery", VAR_SERVER},
+       {"LocalDiscovery", VAR_SERVER | VAR_SAFE},
        {"LogLevel", VAR_SERVER},
-       {"MACExpire", VAR_SERVER},
-       {"MaxConnectionBurst", VAR_SERVER},
-       {"MaxOutputBufferSize", VAR_SERVER},
-       {"MaxTimeout", VAR_SERVER},
+       {"MACExpire", VAR_SERVER | VAR_SAFE},
+       {"MaxConnectionBurst", VAR_SERVER | VAR_SAFE},
+       {"MaxOutputBufferSize", VAR_SERVER | VAR_SAFE},
+       {"MaxTimeout", VAR_SERVER | VAR_SAFE},
        {"Mode", VAR_SERVER | VAR_SAFE},
        {"Name", VAR_SERVER},
-       {"PingInterval", VAR_SERVER},
-       {"PingTimeout", VAR_SERVER},
+       {"PingInterval", VAR_SERVER | VAR_SAFE},
+       {"PingTimeout", VAR_SERVER | VAR_SAFE},
        {"PriorityInheritance", VAR_SERVER},
        {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
        {"PrivateKeyFile", VAR_SERVER},
        {"ProcessPriority", VAR_SERVER},
        {"Proxy", VAR_SERVER},
-       {"ReplayWindow", VAR_SERVER},
+       {"ReplayWindow", VAR_SERVER | VAR_SAFE},
        {"ScriptsExtension", VAR_SERVER},
        {"ScriptsInterpreter", VAR_SERVER},
-       {"StrictSubnets", VAR_SERVER},
-       {"TunnelServer", VAR_SERVER},
-       {"UDPDiscovery", VAR_SERVER},
-       {"UDPDiscoveryKeepaliveInterval", VAR_SERVER},
-       {"UDPDiscoveryInterval", VAR_SERVER},
-       {"UDPDiscoveryTimeout", VAR_SERVER},
-       {"MTUInfoInterval", VAR_SERVER},
-       {"UDPInfoInterval", VAR_SERVER},
+       {"StrictSubnets", VAR_SERVER | VAR_SAFE},
+       {"TunnelServer", VAR_SERVER | VAR_SAFE},
+       {"UDPDiscovery", VAR_SERVER | VAR_SAFE},
+       {"UDPDiscoveryKeepaliveInterval", VAR_SERVER | VAR_SAFE},
+       {"UDPDiscoveryInterval", VAR_SERVER | VAR_SAFE},
+       {"UDPDiscoveryTimeout", VAR_SERVER | VAR_SAFE},
+       {"MTUInfoInterval", VAR_SERVER | VAR_SAFE},
+       {"UDPInfoInterval", VAR_SERVER | VAR_SAFE},
        {"UDPRcvBuf", VAR_SERVER},
        {"UDPSndBuf", VAR_SERVER},
        {"UPnP", VAR_SERVER},
@@ -1776,12 +1776,12 @@ const var_t variables[] = {
        /* Host configuration */
        {"Address", VAR_HOST | VAR_MULTIPLE},
        {"Cipher", VAR_SERVER | VAR_HOST},
-       {"ClampMSS", VAR_SERVER | VAR_HOST},
-       {"Compression", VAR_SERVER | VAR_HOST},
+       {"ClampMSS", VAR_SERVER | VAR_HOST | VAR_SAFE},
+       {"Compression", VAR_SERVER | VAR_HOST | VAR_SAFE},
        {"Digest", VAR_SERVER | VAR_HOST},
        {"Ed25519PublicKey", VAR_HOST},
        {"Ed25519PublicKeyFile", VAR_SERVER | VAR_HOST},
-       {"IndirectData", VAR_SERVER | VAR_HOST},
+       {"IndirectData", VAR_SERVER | VAR_HOST | VAR_SAFE},
        {"MACLength", VAR_SERVER | VAR_HOST},
        {"PMTU", VAR_SERVER | VAR_HOST},
        {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
@@ -1789,7 +1789,7 @@ const var_t variables[] = {
        {"PublicKey", VAR_HOST | VAR_OBSOLETE},
        {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
        {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
-       {"TCPOnly", VAR_SERVER | VAR_HOST},
+       {"TCPOnly", VAR_SERVER | VAR_HOST | VAR_SAFE},
        {"Weight", VAR_HOST | VAR_SAFE},
        {NULL, 0}
 };