#include <stdlib.h>
#include <sys/wait.h>
#include <sys/types.h>
+#include <sys/socket.h>
+#include <linux/rtnetlink.h>
+
#include "l2tpns.h"
#include "plugin.h"
#include "control.h"
-int __plugin_api_version = 1;
-struct pluginfuncs p;
+/* walled garden */
+
+int plugin_api_version = PLUGIN_API_VERSION;
+static struct pluginfuncs *f = 0;
-int garden_session(sessiont *s, int flag);
+static int iam_master = 0; // We're all slaves! Slaves I tell you!
-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 *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 (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";
- 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;
+ }
+
+ 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;
+}
+
+// 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)
+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;
+
+ 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 (!s) return 0;
- if (!s->opened) return 0;
+ snprintf(cmd, sizeof(cmd),
+ "iptables -t nat -A garden_users -s %s -j garden",
+ f->fmtaddr(htonl(s->ip), 0));
- if (flag == 1)
+ 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))
+ {
+ f->sessionkill(other,
+ "Duplicate session when user released from walled garden");
+ }
+
+ /* Clean up counters */
+ s->pin = s->pout = 0;
+ s->cin = s->cout = 0;
+ s->cin_delta = s->cout_delta = s->coutgrp_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)
{
- 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);
- }
+ /* OK, we're up! */
+ uint16_t r = f->radiusnew(f->get_id_by_session(s));
+ if (r) f->radiussend(r, RADIUSSTART);
}
- s->walled_garden = flag;
- return 1;
+ }
+
+ 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]);
+ }
}
projects / l2tpns.git / blobdiff