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- Add startup-config(5) manpage [FIXME].
[l2tpns.git] / garden.c
diff --git a/garden.c b/garden.c
index e9eecb2..ba228cd 100644 (file)
--- a/garden.c
+++ b/garden.c
@@ -7,22 +7,37 @@
 #include "plugin.h"
 #include "control.h"
 
 #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 1.13 2004-11-17 08:23:34 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 -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);
 };
 
 int garden_session(sessiont *s, int flag);
@@ -32,7 +47,7 @@ int plugin_post_auth(struct param_post_auth *data)
        // Ignore if user authentication was successful
        if (data->auth_allowed) return PLUGIN_RET_OK;
 
        // 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, 0, 0, 0, "Walled Garden allowing login\n");
        data->auth_allowed = 1;
        data->s->walled_garden = 1;
        return PLUGIN_RET_OK;
        data->auth_allowed = 1;
        data->s->walled_garden = 1;
        return PLUGIN_RET_OK;
@@ -40,49 +55,111 @@ int plugin_post_auth(struct param_post_auth *data)
 
 int plugin_new_session(struct param_new_session *data)
 {
 
 int plugin_new_session(struct param_new_session *data)
 {
-       if (data->s->walled_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)
 {
        return PLUGIN_RET_OK;
 }
 
 int plugin_kill_session(struct param_new_session *data)
 {
-       if (data->s->walled_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;
 }
 
        return PLUGIN_RET_OK;
 }
 
+char *plugin_control_help[] = {
+       "  garden USER|SID       Put user into the walled garden",
+       "  ungarden USER|SID     Release user",
+       0
+};
+
 int plugin_control(struct param_control *data)
 {
 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 (!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 || (strcmp(data->argv[0], "garden") && strcmp(data->argv[0], "ungarden")))
+               return PLUGIN_RET_OK; // not for us
+
+       flag = data->argv[0][0] == 'g';
+
+       if (!iam_master)        // All garden processing happens on the master.
        {
        {
-               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 = "must be run on the cluster master";
+               return PLUGIN_RET_STOP;
+       }
 
 
-               p.log(3, 0, 0, 0, "Unknown session %s\n", session);
+       if (data->argc != 2)
+       {
+               data->response = NSCTL_RES_ERR;
+               data->additional = "one argument required: username or session id";
                return PLUGIN_RET_STOP;
        }
                return PLUGIN_RET_STOP;
        }
-       *(short *)(data->response + 2) = ntohs(PKT_RESP_OK);
 
 
-       if (!(garden_session(s, (data->type == PKT_GARDEN))))
+       if (!(session = strtol(data->argv[0], &end, 10)) || *end)
+               session = p->get_session_by_username(data->argv[0]);
+
+       if (session)
+               s = p->get_session_by_id(session);
+
+       if (!s || !s->ip)
        {
        {
-               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 = "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->response = NSCTL_RES_OK;
+       data->additional = 0;
+
        return PLUGIN_RET_STOP;
 }
 
        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, 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];
 int garden_session(sessiont *s, int flag)
 {
        char cmd[2048];
@@ -90,34 +167,11 @@ int garden_session(sessiont *s, int flag)
        if (!s) return 0;
        if (!s->opened) return 0;
 
        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.
-        */
        if (flag == 1)
        {
        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, 0, 0, s->tunnel, "Garden user %s (%s)\n", s->user, p->inet_toa(htonl(s->ip)));
+               snprintf(cmd, sizeof(cmd), "iptables -t nat -A garden_users -s %s -j garden", p->inet_toa(htonl(s->ip)));
+               p->log(3, 0, 0, s->tunnel, "%s\n", cmd);
                system(cmd);
                s->walled_garden = 1;
        }
                system(cmd);
                s->walled_garden = 1;
        }
@@ -127,18 +181,18 @@ int garden_session(sessiont *s, int flag)
                int count = 40;
 
                // Normal User
                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, 0, 0, s->tunnel, "Un-Garden user %s (%s)\n", s->user, p->inet_toa(htonl(s->ip)));
                // Kick off any duplicate usernames
                // but make sure not to kick off ourself
                // 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;
 
                }
                /* 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->inet_toa(htonl(s->ip)));
+               p->log(3, 0, 0, s->tunnel, "%s\n", cmd);
                while (--count)
                {
                        int status = system(cmd);
                while (--count)
                {
                        int status = system(cmd);
@@ -149,8 +203,8 @@ int garden_session(sessiont *s, int flag)
 
                if (!s->die) {
                        /* OK, we're up! */
 
                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->walled_garden = flag;
                }
        }
        s->walled_garden = flag;
@@ -159,15 +213,32 @@ int garden_session(sessiont *s, int flag)
 
 int plugin_init(struct pluginfuncs *funcs)
 {
 
 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, 0, "Running %s\n", down_commands[i]);
+                       system(down_commands[i]);
+               }
        }
 
        return 1;
        }
 
        return 1;
@@ -176,10 +247,14 @@ int plugin_init(struct pluginfuncs *funcs)
 void plugin_done()
 {
        int i;
 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, 0, "Running %s\n", down_commands[i]);
+               system(down_commands[i]);
        }
 }
 
        }
 }
 
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"