X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/3aa4eda8b1e0c4abc04439affe850d33648c7472..fbd2194031738e255e7b1297f2c7e612c1a6944e:/garden.c

diff --git a/garden.c b/garden.c
index 064bea2..44b9597 100644
--- a/garden.c
+++ b/garden.c
@@ -7,166 +7,291 @@
 #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
+/* walled garden */
+
+char const *cvs_id = "$Id: garden.c,v 1.25 2006/02/23 01:07:23 bodea Exp $";
+
+int plugin_api_version = PLUGIN_API_VERSION;
+static struct pluginfuncs *f = 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 -A PREROUTING -j garden_users",		// DNAT any users on the garden_users chain
+    "sysctl -w net.ipv4.netfilter.ip_conntrack_max=512000"	// lots of entries
+    	     " net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=18000 >/dev/null", // 5hrs
+    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
+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,
 };
 
+#define F_UNGARDEN	0
+#define F_GARDEN	1
+#define F_CLEANUP	2
+
+int garden_session(sessiont *s, int flag, char *newuser);
+
 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;
+    // Ignore if user authentication was successful
+    if (data->auth_allowed)
 	return PLUGIN_RET_OK;
+
+    f->log(3, f->get_id_by_session(data->s), data->s->tunnel,
+	"Walled Garden allowing login\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;
+    if (!iam_master)
+	return PLUGIN_RET_OK;	// Slaves don't do walled garden processing.
+
+    if (data->s->walled_garden)
+	garden_session(data->s, F_GARDEN, 0);
+
+    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;
+    if (!iam_master)
+	return PLUGIN_RET_OK;	// Slaves don't do walled garden processing.
+
+    if (data->s->walled_garden)
+	garden_session(data->s, F_CLEANUP, 0);
+
+    return PLUGIN_RET_OK;
 }
 
+char *plugin_control_help[] = {
+    "  garden USER|SID                             Put user into the walled garden",
+    "  ungarden SID [USER]                         Release session from garden",
+    0
+};
+
 int plugin_control(struct param_control *data)
 {
-	sessiont *s;
-	sessionidt session;
+    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 (data->argc < 1)
+	return PLUGIN_RET_OK;
 
-	if (!session)
-		return PLUGIN_RET_OK;
+    if (strcmp(data->argv[0], "garden") && strcmp(data->argv[0], "ungarden"))
+	return PLUGIN_RET_OK; // not for us
 
-	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;
+    if (!iam_master)
+	return PLUGIN_RET_NOTMASTER;
 
-		p.log(3, 0, 0, 0, "Unknown session %s\n", session);
-		return PLUGIN_RET_STOP;
-	}
-	*(short *)(data->response + 2) = ntohs(PKT_RESP_OK);
+    flag = data->argv[0][0] == 'g' ? F_GARDEN : F_UNGARDEN;
 
-	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;
-	}
+    if (data->argc < 2 || data->argc > 3 || (data->argc > 2 && flag == F_GARDEN))
+    {
+	data->response = NSCTL_RES_ERR;
+	data->additional = flag == F_GARDEN
+	    ? "requires username or session id"
+	    : "requires session id and optional username";
+
+	return PLUGIN_RET_STOP;
+    }
+
+    if (!(session = strtol(data->argv[1], &end, 10)) || *end)
+    {
+	if (flag)
+	    session = f->get_session_by_username(data->argv[1]);
+	else
+	    session = 0; // can't ungarden by username
+    }
+
+    if (session)
+	s = f->get_session_by_id(session);
+
+    if (!s || !s->ip)
+    {
+	data->response = NSCTL_RES_ERR;
+	data->additional = "session not found";
 	return PLUGIN_RET_STOP;
+    }
+
+    if (s->walled_garden == flag)
+    {
+	data->response = NSCTL_RES_ERR;
+	data->additional = flag ? "already in walled garden" : "not in walled garden";
+	return PLUGIN_RET_STOP;
+    }
+
+    garden_session(s, flag, data->argc > 2 ? data->argv[2] : 0);
+    f->session_changed(session);
+
+    data->response = NSCTL_RES_OK;
+    data->additional = 0;
+
+    return PLUGIN_RET_STOP;
 }
 
-int plugin_config(struct param_config *data)
+int plugin_become_master(void)
 {
-	return PLUGIN_RET_OK;
+    int i;
+    iam_master = 1;	// We just became the master. Wow!
+
+    for (i = 0; up_commands[i] && *up_commands[i]; i++)
+    {
+	f->log(3, 0, 0, "Running %s\n", up_commands[i]);
+	system(up_commands[i]);
+    }
+
+    return PLUGIN_RET_OK;
 }
 
-int garden_session(sessiont *s, int flag)
+// Called for each active session after becoming master
+int plugin_new_session_master(sessiont *s)
+{	
+    if (s->walled_garden)
+	garden_session(s, F_GARDEN, 0);
+
+    return PLUGIN_RET_OK;
+}
+
+int garden_session(sessiont *s, int flag, char *newuser)
 {
-	char cmd[2048];
+    char cmd[2048];
+    sessionidt sess;
+
+    if (!s) return 0;
+    if (!s->opened) return 0;
 
-	if (!s) return 0;
-	if (!s->opened) return 0;
+    sess = f->get_id_by_session(s);
+    if (flag == F_GARDEN)
+    {
+	f->log(2, sess, s->tunnel, "Garden user %s (%s)\n", s->user,
+	    f->fmtaddr(htonl(s->ip), 0));
 
-	if (flag == 1)
+	snprintf(cmd, sizeof(cmd),
+	    "iptables -t nat -A garden_users -s %s -j garden",
+	    f->fmtaddr(htonl(s->ip), 0));
+
+	f->log(3, sess, s->tunnel, "%s\n", cmd);
+	system(cmd);
+	s->walled_garden = 1;
+    }
+    else
+    {
+	sessionidt other;
+	int count = 40;
+
+	// Normal User
+	f->log(2, sess, s->tunnel, "Un-Garden user %s (%s)\n", s->user, f->fmtaddr(htonl(s->ip), 0));
+	if (newuser)
 	{
-		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;
+	    snprintf(s->user, MAXUSER, "%s", newuser);
+	    f->log(2, sess, s->tunnel, "  Setting username to %s\n", s->user);
 	}
-	else
+
+	// Kick off any duplicate usernames
+	// but make sure not to kick off ourself
+	if (s->ip && !s->die && (other = f->get_session_by_username(s->user)) &&
+	    s != f->get_session_by_id(other))
 	{
-		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);
-		}
+	    f->sessionkill(other,
+		"Duplicate session when user released from walled garden");
 	}
-	s->walled_garden = flag;
-	return 1;
+
+	/* Clean up counters */
+	s->pin = s->pout = 0;
+	s->cin = s->cout = 0;
+	s->cin_delta = s->cout_delta = 0;
+	s->cin_wrap = s->cout_wrap = 0;
+
+	snprintf(cmd, sizeof(cmd),
+	    "iptables -t nat -D garden_users -s %s -j garden",
+	    f->fmtaddr(htonl(s->ip), 0));
+
+	f->log(3, sess, s->tunnel, "%s\n", cmd);
+	while (--count)
+	{
+	    int status = system(cmd);
+	    if (WEXITSTATUS(status) != 0) break;
+	}
+
+	s->walled_garden = 0;
+
+	if (flag != F_CLEANUP)
+	{
+	    /* OK, we're up! */
+	    uint16_t r = f->radiusnew(f->get_id_by_session(s));
+	    if (r) f->radiussend(r, RADIUSSTART);
+	}
+    }
+
+    return 1;
 }
 
 int plugin_init(struct pluginfuncs *funcs)
 {
-	int i;
+    FILE *tables;
+    int found_nat = 0;
+
+    if (!funcs)
+	return 0;
 
-	if (!funcs) return 0;
-	memcpy(&p, funcs, sizeof(p));
+    f = funcs;
 
-	p.log(1, 0, 0, 0, "Enabling walled garden service\n");
+    if ((tables = fopen("/proc/net/ip_tables_names", "r")))
+    {
+	char buf[1024];
+	while (fgets(buf, sizeof(buf), tables) && !found_nat)
+	    found_nat = !strcmp(buf, "nat\n");
 
-	for (i = 0; init_commands[i] && *init_commands[i]; i++)
+	fclose(tables);
+    }
+
+    /* master killed/crashed? */
+    if (found_nat)
+    {
+	int i;
+	for (i = 0; down_commands[i] && *down_commands[i]; i++)
 	{
-		p.log(4, 0, 0, 0, "Running %s\n", init_commands[i]);
-		system(init_commands[i]);
+	    f->log(3, 0, 0, "Running %s\n", down_commands[i]);
+	    system(down_commands[i]);
 	}
+    }
 
-	return 1;
+    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]);
-	}
+    int i;
+
+    if (!iam_master)	// Never became master. nothing to do.
+	return;
+
+    for (i = 0; down_commands[i] && *down_commands[i]; i++)
+    {
+	f->log(3, 0, 0, "Running %s\n", down_commands[i]);
+	system(down_commands[i]);
+    }
 }