Initial revision

garden.c

@@ -0,0 +1,172 @@
+#include <string.h>
+#include <malloc.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include "l2tpns.h"
+#include "plugin.h"
+#include "control.h"
+
+int __plugin_api_version = 1;
+struct pluginfuncs p;
+
+int garden_session(sessiont *s, int flag);
+
+char *init_commands[] = {
+	// This is for incoming connections to a gardened user
+	"iptables -t nat -N garden_users 2>&1 >/dev/null",
+	"iptables -t nat -F garden_users 2>&1 >/dev/null",
+	"iptables -t nat -N garden 2>&1 >/dev/null",
+	"iptables -t nat -A l2tpns -j garden_users",
+	NULL
+};
+
+char *done_commands[] = {
+	"iptables -t nat -F garden_users 2>&1 >/dev/null",
+	"iptables -t nat -D l2tpns -j garden_users 2>&1 >/dev/null",
+	NULL
+};
+
+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, "User allowed into walled garden\n");
+	data->auth_allowed = 1;
+	data->s->walled_garden = 1;
+	return PLUGIN_RET_OK;
+}
+
+int plugin_new_session(struct param_new_session *data)
+{
+	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->walled_garden) garden_session(data->s, 0);
+	return PLUGIN_RET_OK;
+}
+
+int plugin_control(struct param_control *data)
+{
+	sessiont *s;
+	sessionidt session;
+
+	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;
+
+	data->send_response = 1;
+	s = p.get_session_by_id(session);
+	if (!s || !s->ip)
+	{
+		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;
+
+		p.log(3, 0, 0, 0, "Unknown session %s\n", session);
+		return PLUGIN_RET_STOP;
+	}
+	*(short *)(data->response + 2) = ntohs(PKT_RESP_OK);
+
+	if (!(garden_session(s, (data->type == PKT_GARDEN))))
+	{
+		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;
+	}
+	return PLUGIN_RET_STOP;
+}
+
+int plugin_config(struct param_config *data)
+{
+	return PLUGIN_RET_OK;
+}
+
+int garden_session(sessiont *s, int flag)
+{
+	char cmd[2048];
+
+	if (!s) return 0;
+	if (!s->opened) return 0;
+
+	if (flag == 1)
+	{
+		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);
+		system(cmd);
+		s->walled_garden = 1;
+	}
+	else
+	{
+		sessionidt other;
+		int count = 10;
+
+		// 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)));
+		// 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 ungardened");
+		}
+		/* 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);
+		while (--count)
+		{
+			int status = system(cmd);
+			if (WEXITSTATUS(status) != 0) break;
+		}
+
+		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);
+		}
+	}
+	s->walled_garden = flag;
+	return 1;
+}
+
+int plugin_init(struct pluginfuncs *funcs)
+{
+	int i;
+
+	if (!funcs) return 0;
+	memcpy(&p, funcs, sizeof(p));
+
+	p.log(1, 0, 0, 0, "Enabling walled garden service\n");
+
+	for (i = 0; init_commands[i] && *init_commands[i]; i++)
+	{
+		p.log(4, 0, 0, 0, "Running %s\n", init_commands[i]);
+		system(init_commands[i]);
+	}
+
+	return 1;
+}
+
+void plugin_done()
+{
+	int i;
+	for (i = 0; done_commands[i] && *done_commands[i]; i++)
+	{
+		p.log(4, 0, 0, 0, "Running %s\n", done_commands[i]);
+		system(done_commands[i]);
+	}
+}
+