281 lines
6.6 KiB
C
281 lines
6.6 KiB
C
#include <string.h>
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#include <malloc.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include "l2tpns.h"
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#include "plugin.h"
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#include "control.h"
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/* walled garden */
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char const *cvs_id = "$Id: garden.c,v 1.23 2005/06/02 11:32:30 bodea Exp $";
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int plugin_api_version = PLUGIN_API_VERSION;
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static struct pluginfuncs *p = 0;
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static int iam_master = 0; // We're all slaves! Slaves I tell you!
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char *up_commands[] = {
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"iptables -t nat -N garden >/dev/null 2>&1", // Create a chain that all gardened users will go through
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"iptables -t nat -F garden",
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". " PLUGINCONF "/build-garden", // Populate with site-specific DNAT rules
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"iptables -t nat -N garden_users >/dev/null 2>&1", // Empty chain, users added/removed by garden_session
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"iptables -t nat -F garden_users",
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"iptables -t nat -A PREROUTING -j garden_users", // DNAT any users on the garden_users chain
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"sysctl -w net.ipv4.ip_conntrack_max=512000 >/dev/null", // lots of entries
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NULL,
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};
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char *down_commands[] = {
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"iptables -t nat -F PREROUTING",
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"iptables -t nat -F garden_users",
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"iptables -t nat -X garden_users",
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"iptables -t nat -F garden",
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"iptables -t nat -X garden",
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"rmmod iptable_nat", // Should also remove ip_conntrack, but
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// doing so can take hours... literally.
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// If a master is re-started as a slave,
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// either rmmod manually, or reboot.
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NULL,
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};
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#define F_UNGARDEN 0
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#define F_GARDEN 1
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#define F_CLEANUP 2
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int garden_session(sessiont *s, int flag, char *newuser);
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int plugin_post_auth(struct param_post_auth *data)
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{
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// Ignore if user authentication was successful
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if (data->auth_allowed) return PLUGIN_RET_OK;
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p->log(3, p->get_id_by_session(data->s), data->s->tunnel, "Walled Garden allowing login\n");
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data->auth_allowed = 1;
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data->s->walled_garden = 1;
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return PLUGIN_RET_OK;
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}
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int plugin_new_session(struct param_new_session *data)
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{
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if (!iam_master)
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return PLUGIN_RET_OK; // Slaves don't do walled garden processing.
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if (data->s->walled_garden)
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garden_session(data->s, F_GARDEN, 0);
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return PLUGIN_RET_OK;
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}
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int plugin_kill_session(struct param_new_session *data)
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{
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if (!iam_master)
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return PLUGIN_RET_OK; // Slaves don't do walled garden processing.
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if (data->s->walled_garden)
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garden_session(data->s, F_CLEANUP, 0);
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return PLUGIN_RET_OK;
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}
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char *plugin_control_help[] = {
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" garden USER|SID Put user into the walled garden",
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" ungarden SID [USER] Release session from garden",
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0
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};
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int plugin_control(struct param_control *data)
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{
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sessionidt session;
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sessiont *s = 0;
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int flag;
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char *end;
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if (data->argc < 1)
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return PLUGIN_RET_OK;
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if (strcmp(data->argv[0], "garden") && strcmp(data->argv[0], "ungarden"))
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return PLUGIN_RET_OK; // not for us
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if (!iam_master)
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return PLUGIN_RET_NOTMASTER;
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flag = data->argv[0][0] == 'g' ? F_GARDEN : F_UNGARDEN;
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if (data->argc < 2 || data->argc > 3 || (data->argc > 2 && flag == F_GARDEN))
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{
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data->response = NSCTL_RES_ERR;
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data->additional = flag == F_GARDEN
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? "requires username or session id"
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: "requires session id and optional username";
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return PLUGIN_RET_STOP;
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}
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if (!(session = strtol(data->argv[1], &end, 10)) || *end)
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{
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if (flag)
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session = p->get_session_by_username(data->argv[1]);
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else
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session = 0; // can't ungarden by username
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}
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if (session)
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s = p->get_session_by_id(session);
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if (!s || !s->ip)
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{
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data->response = NSCTL_RES_ERR;
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data->additional = "session not found";
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return PLUGIN_RET_STOP;
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}
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if (s->walled_garden == flag)
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{
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data->response = NSCTL_RES_ERR;
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data->additional = flag ? "already in walled garden" : "not in walled garden";
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return PLUGIN_RET_STOP;
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}
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garden_session(s, flag, data->argc > 2 ? data->argv[2] : 0);
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p->session_changed(session);
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data->response = NSCTL_RES_OK;
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data->additional = 0;
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return PLUGIN_RET_STOP;
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}
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int plugin_become_master(void)
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{
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int i;
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iam_master = 1; // We just became the master. Wow!
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for (i = 0; up_commands[i] && *up_commands[i]; i++)
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{
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p->log(3, 0, 0, "Running %s\n", up_commands[i]);
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system(up_commands[i]);
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}
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return PLUGIN_RET_OK;
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}
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// Called for each active session after becoming master
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int plugin_new_session_master(sessiont *s)
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{
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if (s->walled_garden)
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garden_session(s, F_GARDEN, 0);
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return PLUGIN_RET_OK;
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}
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int garden_session(sessiont *s, int flag, char *newuser)
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{
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char cmd[2048];
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sessionidt sess;
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if (!s) return 0;
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if (!s->opened) return 0;
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sess = p->get_id_by_session(s);
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if (flag == F_GARDEN)
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{
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p->log(2, sess, s->tunnel, "Garden user %s (%s)\n", s->user, p->fmtaddr(htonl(s->ip), 0));
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snprintf(cmd, sizeof(cmd), "iptables -t nat -A garden_users -s %s -j garden", p->fmtaddr(htonl(s->ip), 0));
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p->log(3, sess, s->tunnel, "%s\n", cmd);
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system(cmd);
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s->walled_garden = 1;
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}
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else
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{
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sessionidt other;
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int count = 40;
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// Normal User
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p->log(2, sess, s->tunnel, "Un-Garden user %s (%s)\n", s->user, p->fmtaddr(htonl(s->ip), 0));
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if (newuser)
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{
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snprintf(s->user, MAXUSER, "%s", newuser);
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p->log(2, sess, s->tunnel, " Setting username to %s\n", s->user);
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}
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// Kick off any duplicate usernames
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// but make sure not to kick off ourself
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if (s->ip && !s->die && (other = p->get_session_by_username(s->user)) && s != p->get_session_by_id(other)) {
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p->sessionkill(other, "Duplicate session when user released from walled garden");
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}
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/* Clean up counters */
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s->pin = s->pout = 0;
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s->cin = s->cout = 0;
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s->cin_delta = s->cout_delta = 0;
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s->cin_wrap = s->cout_wrap = 0;
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snprintf(cmd, sizeof(cmd), "iptables -t nat -D garden_users -s %s -j garden", p->fmtaddr(htonl(s->ip), 0));
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p->log(3, sess, s->tunnel, "%s\n", cmd);
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while (--count)
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{
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int status = system(cmd);
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if (WEXITSTATUS(status) != 0) break;
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}
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s->walled_garden = 0;
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if (flag != F_CLEANUP)
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{
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/* OK, we're up! */
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uint16_t r = p->radiusnew(p->get_id_by_session(s));
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if (r) p->radiussend(r, RADIUSSTART);
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}
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}
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return 1;
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}
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int plugin_init(struct pluginfuncs *funcs)
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{
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FILE *tables;
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int found_nat = 0;
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if (!funcs)
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return 0;
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p = funcs;
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if ((tables = fopen("/proc/net/ip_tables_names", "r")))
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{
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char buf[1024];
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while (fgets(buf, sizeof(buf), tables) && !found_nat)
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found_nat = !strcmp(buf, "nat\n");
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fclose(tables);
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}
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/* master killed/crashed? */
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if (found_nat)
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{
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int i;
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for (i = 0; down_commands[i] && *down_commands[i]; i++)
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{
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p->log(3, 0, 0, "Running %s\n", down_commands[i]);
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system(down_commands[i]);
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}
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}
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return 1;
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}
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void plugin_done()
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{
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int i;
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if (!iam_master) // Never became master. nothing to do.
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return;
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for (i = 0; down_commands[i] && *down_commands[i]; i++)
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{
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p->log(3, 0, 0, "Running %s\n", down_commands[i]);
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system(down_commands[i]);
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}
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}
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