X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/b43583c01d146d8cc3cb826937efe3d0f47ec819..5a3b9184c8d1ab6c494ae62272e5d6c6fcd874ff:/garden.c

diff --git a/garden.c b/garden.c
index 1083b65..e6843bc 100644
--- a/garden.c
+++ b/garden.c
@@ -7,22 +7,37 @@
 #include "plugin.h"
 #include "control.h"
 
-int __plugin_api_version = 1;
-struct pluginfuncs p;
+/* walled garden */
 
-char *init_commands[] = {
-	// This is for incoming connections to a gardened user
-	"iptables -t nat -N garden_users 2>&1 >/dev/null",
+char const *cvs_id = "$Id: garden.c,v 1.17 2004/11/29 02:17:17 bodea Exp $";
+
+int plugin_api_version = PLUGIN_API_VERSION;
+static struct pluginfuncs *p = 0;
+
+static int iam_master = 0;	// We're all slaves! Slaves I tell you!
+
+char *up_commands[] = {
+	"iptables -t nat -N garden >/dev/null 2>&1",			// Create a chain that all gardened users will go through
+	"iptables -t nat -F garden",
+	". " PLUGINCONF "/build-garden",				// Populate with site-specific DNAT rules
+	"iptables -t nat -N garden_users >/dev/null 2>&1",		// Empty chain, users added/removed by garden_session
 	"iptables -t nat -F garden_users",
-	"iptables -t nat -N garden 2>&1", /* Don't flush - init script sets this up */
-	"iptables -t nat -A l2tpns -j garden_users",
-	NULL
+	"iptables -t nat -A PREROUTING -j garden_users",		// DNAT any users on the garden_users chain
+	"sysctl -w net.ipv4.ip_conntrack_max=256000 >/dev/null",	// lots of entries
+	NULL,
 };
 
-char *done_commands[] = {
-	"iptables -t nat -F garden_users 2>&1 >/dev/null",
-	"iptables -t nat -D l2tpns -j garden_users",
-	NULL
+char *down_commands[] = {
+	"iptables -t nat -F PREROUTING",
+	"iptables -t nat -F garden_users",
+	"iptables -t nat -X garden_users",
+	"iptables -t nat -F garden",
+	"iptables -t nat -X garden",
+	"rmmod iptable_nat",	// Should also remove ip_conntrack, but
+				// doing so can take hours...  literally.
+				// If a master is re-started as a slave,
+				// either rmmod manually, or reboot.
+	NULL,
 };
 
 int garden_session(sessiont *s, int flag);
@@ -32,94 +47,141 @@ int plugin_post_auth(struct param_post_auth *data)
 	// Ignore if user authentication was successful
 	if (data->auth_allowed) return PLUGIN_RET_OK;
 
-	p.log(3, 0, 0, 0, "Walled Garden allowing login\n");
+	p->log(3, p->get_id_by_session(data->s), data->s->tunnel, "Walled Garden allowing login\n");
 	data->auth_allowed = 1;
-	data->s->garden = 1;
+	data->s->walled_garden = 1;
 	return PLUGIN_RET_OK;
 }
 
 int plugin_new_session(struct param_new_session *data)
 {
-	if (data->s->garden) garden_session(data->s, 1);
+	if (!iam_master)
+		return PLUGIN_RET_OK;	// Slaves don't do walled garden processing.
+
+	if (data->s->walled_garden)
+		garden_session(data->s, 1);
+
 	return PLUGIN_RET_OK;
 }
 
 int plugin_kill_session(struct param_new_session *data)
 {
-	if (data->s->garden) garden_session(data->s, 0);
+	if (!iam_master)
+		return PLUGIN_RET_OK;	// Slaves don't do walled garden processing.
+
+	if (data->s->walled_garden)
+		garden_session(data->s, 0);
+
 	return PLUGIN_RET_OK;
 }
 
+char *plugin_control_help[] = {
+	"  garden USER|SID                             Put user into the walled garden",
+	"  ungarden SID                                Release session from garden",
+	0
+};
+
 int plugin_control(struct param_control *data)
 {
-	sessiont *s;
 	sessionidt session;
+	sessiont *s = 0;
+	int flag;
+	char *end;
 
-	if (data->type != PKT_GARDEN && data->type != PKT_UNGARDEN) return PLUGIN_RET_OK;
-	if (!data->data && data->data_length) return PLUGIN_RET_OK;
-	session = atoi((char*)(data->data));
-	if (!session) return PLUGIN_RET_OK; // Really?
-	data->send_response = 1;
-	s = p.get_session_by_id(session);
-	if (!s || !s->ip)
+	if (data->argc < 1)
+		return PLUGIN_RET_OK;
+
+	if (strcmp(data->argv[0], "garden") && strcmp(data->argv[0], "ungarden"))
+		return PLUGIN_RET_OK; // not for us
+
+	if (!iam_master)
+		return PLUGIN_RET_NOTMASTER;
+
+	flag = data->argv[0][0] != 'u';
+
+	if (data->argc != 2)
 	{
-		char *errormsg = "Session not connected";
-		*(short *)(data->response + 2) = ntohs(PKT_RESP_ERROR);
-		sprintf((data->response + data->response_length), "%s", errormsg);
-		data->response_length += strlen(errormsg) + 1;
+	    	data->response = NSCTL_RES_ERR;
+		data->additional = "one argument required: username or session id";
+		return PLUGIN_RET_STOP;
+	}
+
+	if (!(session = strtol(data->argv[1], &end, 10)) || *end)
+	{
+		if (flag)
+			session = p->get_session_by_username(data->argv[1]);
+		else
+			session = 0; // can't ungarden by username
+	}
 
-		p.log(3, 0, 0, 0, "Unknown session %s\n", session);
+	if (session)
+		s = p->get_session_by_id(session);
+
+	if (!s || !s->ip)
+	{
+		data->response = NSCTL_RES_ERR;
+		data->additional = "session not found";
 		return PLUGIN_RET_STOP;
 	}
-	*(short *)(data->response + 2) = ntohs(PKT_RESP_OK);
 
-	if (!(garden_session(s, (data->type == PKT_GARDEN))))
+	if (s->walled_garden == flag)
 	{
-		char *errormsg = "User not connected";
-		*(short *)(data->response + 2) = ntohs(PKT_RESP_ERROR);
-		sprintf((data->response + data->response_length), "%s", errormsg);
-		data->response_length += strlen(errormsg) + 1;
+		data->response = NSCTL_RES_ERR;
+		data->additional = flag ? "already in walled garden" : "not in walled garden";
+		return PLUGIN_RET_STOP;
 	}
+
+	garden_session(s, flag);
+	p->session_changed(session);
+
+	data->response = NSCTL_RES_OK;
+	data->additional = 0;
+
 	return PLUGIN_RET_STOP;
 }
 
+int plugin_become_master(void)
+{
+	int i;
+	iam_master = 1;	// We just became the master. Wow!
+
+	for (i = 0; up_commands[i] && *up_commands[i]; i++)
+	{
+		p->log(3, 0, 0, "Running %s\n", up_commands[i]);
+		system(up_commands[i]);
+	}
+
+	return PLUGIN_RET_OK;
+}
+
+// Called for each active session after becoming master
+int plugin_new_session_master(sessiont *s)
+{	
+	if (s->walled_garden)
+	{
+		s->walled_garden = 0;
+		garden_session(s, 1);
+	}
+
+	return PLUGIN_RET_OK;
+}
+
 int garden_session(sessiont *s, int flag)
 {
 	char cmd[2048];
+	sessionidt sess;
 
 	if (!s) return 0;
 	if (!s->opened) return 0;
 
-	/* Note that we don't handle throttling/snooping/etc here
-	 * To do that, we'd need to send an end accounting record
-	 * then a radius auth, then start accouting again.
-	 * That means that we need the password (which garden has)
-	 * and a lot of code to check that the new set of params
-	 * (routes, IP, ACLs, etc) 'matched' the old one in a
-	 * 'compatable' way. (ie user's system doesn't need to be told
-	 * of the change)
-	 *
-	 * Thats a lot of pain/code for very little gain.
-	 * If we want them redone from scratch, just sessionkill them -
-	 * a user on garden isn't going to have any open TCP
-	 * connections which are worth caring about, anyway.
-	 *
-	 * Note that the user will be rethrottled shortly by the scan
-	 * script thingy if appropriate.
-	 *
-	 * Currently, garden only directly ungardens someone if
-	 * they haven't paid their bill, and then subsequently do so
-	 * online. This isn't something which can be set up by a malicious
-	 * customer at will.
-	 */
+	sess = p->get_id_by_session(s);
 	if (flag == 1)
 	{
-		// Gardened User
-		p.log(2, 0, 0, s->tunnel, "Trap user %s (%s) in walled garden\n", s->user, p.inet_toa(ntohl(s->ip)));
-		snprintf(cmd, 2048, "iptables -t nat -A garden_users -s %s -j garden", p.inet_toa(ntohl(s->ip)));
-		p.log(3, 0, 0, s->tunnel, "%s\n", cmd);
+		p->log(2, sess, s->tunnel, "Garden user %s (%s)\n", s->user, p->fmtaddr(htonl(s->ip), 0));
+		snprintf(cmd, sizeof(cmd), "iptables -t nat -A garden_users -s %s -j garden", p->fmtaddr(htonl(s->ip), 0));
+		p->log(3, sess, s->tunnel, "%s\n", cmd);
 		system(cmd);
-		s->garden = 1;
+		s->walled_garden = 1;
 	}
 	else
 	{
@@ -127,47 +189,64 @@ int garden_session(sessiont *s, int flag)
 		int count = 40;
 
 		// Normal User
-		p.log(2, 0, 0, s->tunnel, "Release user %s (%s) from walled garden\n", s->user, p.inet_toa(ntohl(s->ip)));
+		p->log(2, sess, s->tunnel, "Un-Garden user %s (%s)\n", s->user, p->fmtaddr(htonl(s->ip), 0));
 		// Kick off any duplicate usernames
 		// but make sure not to kick off ourself
-		if (s->ip && !s->die && (other = p.get_session_by_username(s->user)) && s != p.get_session_by_id(other)) {
-			p.sessionkill(other, "Duplicate session when user un-gardened");
+		if (s->ip && !s->die && (other = p->get_session_by_username(s->user)) && s != p->get_session_by_id(other)) {
+			p->sessionkill(other, "Duplicate session when user released from walled garden");
 		}
 		/* Clean up counters */
 		s->cin = s->cout = 0;
 		s->pin = s->pout = 0;
 
-		snprintf(cmd, 2048, "iptables -t nat -D garden_users -s %s -j garden", p.inet_toa(ntohl(s->ip)));
-		p.log(3, 0, 0, s->tunnel, "%s\n", cmd);
+		snprintf(cmd, sizeof(cmd), "iptables -t nat -D garden_users -s %s -j garden", p->fmtaddr(htonl(s->ip), 0));
+		p->log(3, sess, s->tunnel, "%s\n", cmd);
 		while (--count)
 		{
 			int status = system(cmd);
 			if (WEXITSTATUS(status) != 0) break;
 		}
 
-		s->garden = 0;
+		s->walled_garden = 0;
 
 		if (!s->die) {
 			/* OK, we're up! */
-			u8 r = p.radiusnew(p.get_id_by_session(s));
-			p.radiussend(r, RADIUSSTART);
+			u16 r = p->radiusnew(p->get_id_by_session(s));
+			p->radiussend(r, RADIUSSTART);
 		}
 	}
-	s->garden = flag;
+	s->walled_garden = flag;
 	return 1;
 }
 
 int plugin_init(struct pluginfuncs *funcs)
 {
-	int i;
+	FILE *tables;
+	int found_nat = 0;
 
-	if (!funcs) return 0;
-	memcpy(&p, funcs, sizeof(p));
+	if (!funcs)
+		return 0;
 
-	for (i = 0; init_commands[i] && *init_commands[i]; i++)
+	p = funcs;
+
+	if ((tables = fopen("/proc/net/ip_tables_names", "r")))
 	{
-		p.log(3, 0, 0, 0, "Running %s\n", init_commands[i]);
-		system(init_commands[i]);
+		char buf[1024];
+		while (fgets(buf, sizeof(buf), tables) && !found_nat)
+			found_nat = !strcmp(buf, "nat\n");
+
+		fclose(tables);
+	}
+
+	/* master killed/crashed? */
+	if (found_nat)
+	{
+		int i;
+		for (i = 0; down_commands[i] && *down_commands[i]; i++)
+		{
+			p->log(3, 0, 0, "Running %s\n", down_commands[i]);
+			system(down_commands[i]);
+		}
 	}
 
 	return 1;
@@ -176,10 +255,14 @@ int plugin_init(struct pluginfuncs *funcs)
 void plugin_done()
 {
 	int i;
-	for (i = 0; done_commands[i] && *done_commands[i]; i++)
+
+	if (!iam_master)	// Never became master. nothing to do.
+		return;
+
+	for (i = 0; down_commands[i] && *down_commands[i]; i++)
 	{
-		p.log(3, 0, 0, 0, "Running %s\n", done_commands[i]);
-		system(done_commands[i]);
+		p->log(3, 0, 0, "Running %s\n", down_commands[i]);
+		system(down_commands[i]);
 	}
 }