From 04db34a3a748e74dc9199834cadad78e3c307fa3 Mon Sep 17 00:00:00 2001
From: Thomas <299636+heldchen@users.noreply.github.com>
Date: Sun, 24 May 2020 13:54:31 +0200
Subject: [PATCH] charon-nm: Allow configurable remote traffic selectors

This change allows to customize the previously hard-coded remote traffic
selectors.

This does not actually write the newly added "remote-ts" configuration option
into NetworkManager's configuration file, but will use an existing value.
Exposing the config setting in the GUI could be done later if this is a
desired change.

Use case:  remote firewall appliance wrongly accepts the `0.0.0.0/0` TS but
does not actually route external traffic, leaving the user with a partially
working internet connection.

Closes strongswan/strongswan#173.
---
 src/charon-nm/nm/nm_service.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/src/charon-nm/nm/nm_service.c b/src/charon-nm/nm/nm_service.c
index 771466a63..db4cf4fab 100644
--- a/src/charon-nm/nm/nm_service.c
+++ b/src/charon-nm/nm/nm_service.c
@@ -839,10 +839,34 @@ static gboolean connect_(NMVpnServicePlugin *plugin, NMConnection *connection,
 	}
 	ts = traffic_selector_create_dynamic(0, 0, 65535);
 	child_cfg->add_traffic_selector(child_cfg, TRUE, ts);
-	ts = traffic_selector_create_from_cidr("0.0.0.0/0", 0, 0, 65535);
-	child_cfg->add_traffic_selector(child_cfg, FALSE, ts);
-	ts = traffic_selector_create_from_cidr("::/0", 0, 0, 65535);
-	child_cfg->add_traffic_selector(child_cfg, FALSE, ts);
+	str = nm_setting_vpn_get_data_item(vpn, "remote-ts");
+	if (str && strlen(str))
+	{
+		enumerator = enumerator_create_token(str, ";", "");
+		while (enumerator->enumerate(enumerator, &str))
+		{
+			ts = traffic_selector_create_from_cidr((char*)str, 0, 0, 65535);
+			if (!ts)
+			{
+				g_set_error(err, NM_VPN_PLUGIN_ERROR,
+							NM_VPN_PLUGIN_ERROR_LAUNCH_FAILED,
+							"Invalid remote traffic selector.");
+				enumerator->destroy(enumerator);
+				child_cfg->destroy(child_cfg);
+				peer_cfg->destroy(peer_cfg);
+				return FALSE;
+			}
+			child_cfg->add_traffic_selector(child_cfg, FALSE, ts);
+		}
+		enumerator->destroy(enumerator);
+	}
+	else
+	{
+		ts = traffic_selector_create_from_cidr("0.0.0.0/0", 0, 0, 65535);
+		child_cfg->add_traffic_selector(child_cfg, FALSE, ts);
+		ts = traffic_selector_create_from_cidr("::/0", 0, 0, 65535);
+		child_cfg->add_traffic_selector(child_cfg, FALSE, ts);
+	}
 	peer_cfg->add_child_cfg(peer_cfg, child_cfg);
 
 	/**