X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/7aa420ce9f2c55049b061c7df836ccc990303ebf..9da560ae8ef7f5a1c98884183440e36eb7fb0c15:/garden.c?ds=sidebyside diff --git a/garden.c b/garden.c index 5e3d368..63135ea 100644 --- a/garden.c +++ b/garden.c @@ -3,237 +3,296 @@ #include #include #include +#include +#include + #include "l2tpns.h" #include "plugin.h" #include "control.h" -char const *cvs_id = "$Id: garden.c,v 1.7 2004-06-28 02:43:13 fred_nerk Exp $"; +/* walled garden */ -int __plugin_api_version = 1; -static struct pluginfuncs *p = 0; +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.ip_conntrack_max=256000 >/dev/null", // lots of entries - NULL, + "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 *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 + "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, + NULL, }; -int garden_session(sessiont *s, int flag); +#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, "Walled Garden allowing login\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 (!iam_master) - return PLUGIN_RET_OK; // Slaves don't do walled garden processing. + if (!iam_master) + return PLUGIN_RET_OK; // Slaves don't do walled garden processing. - if (data->s->walled_garden) - garden_session(data->s, 1); + if (data->s->walled_garden) + garden_session(data->s, F_GARDEN, 0); - return PLUGIN_RET_OK; + return PLUGIN_RET_OK; } int plugin_kill_session(struct param_new_session *data) { - if (!iam_master) - return PLUGIN_RET_OK; // Slaves don't do walled garden processing. + if (!iam_master) + return PLUGIN_RET_OK; // Slaves don't do walled garden processing. - if (data->s->walled_garden) - garden_session(data->s, 0); + if (data->s->walled_garden) + garden_session(data->s, F_CLEANUP, 0); - return PLUGIN_RET_OK; + 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 (!iam_master) // All garden processing happens on the master. - return PLUGIN_RET_OK; + if (data->argc < 1) + return PLUGIN_RET_OK; - if (data->type != PKT_GARDEN && data->type != PKT_UNGARDEN) - return PLUGIN_RET_OK; + if (strcmp(data->argv[0], "garden") && strcmp(data->argv[0], "ungarden")) + return PLUGIN_RET_OK; // not for us - if (!data->data && data->data_length) - return PLUGIN_RET_OK; + if (!iam_master) + return PLUGIN_RET_NOTMASTER; - session = atoi((char*)(data->data)); - if (!session) - return PLUGIN_RET_OK; + flag = data->argv[0][0] == 'g' ? F_GARDEN : F_UNGARDEN; - 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 (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"; - p->log(3, 0, 0, 0, "Unknown session %d\n", session); - return PLUGIN_RET_STOP; - } - *(short *)(data->response + 2) = ntohs(PKT_RESP_OK); + return PLUGIN_RET_STOP; + } - 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 (!(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_become_master(void) { - int i; - iam_master = 1; // We just became the master. Wow! + 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]); - } + 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; + return PLUGIN_RET_OK; } // Called for each active session after becoming master -int plugin_new_session_master(sessiont * s) +int plugin_new_session_master(sessiont *s) { - if (s->walled_garden) - garden_session(s, 1); + if (s->walled_garden) + garden_session(s, F_GARDEN, 0); - return PLUGIN_RET_OK; + 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)); + + 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) + { + snprintf(s->user, MAXUSER, "%s", newuser); + f->log(2, sess, s->tunnel, " Setting username to %s\n", s->user); + } - if (!s) return 0; - if (!s->opened) return 0; + // 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 = 0; + s->cin_wrap = s->cout_wrap = 0; - if (flag == 1) + 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) { - p->log(2, 0, 0, s->tunnel, "Garden user %s (%s)\n", s->user, p->inet_toa(htonl(s->ip))); - snprintf(cmd, 2048, "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; + int status = system(cmd); + if (WEXITSTATUS(status) != 0) break; } - else + + s->walled_garden = 0; + + if (flag != F_CLEANUP) { - sessionidt other; - int count = 40; - - // Normal User - 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 - 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; - - snprintf(cmd, 2048, "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); - if (WEXITSTATUS(status) != 0) break; - } - - s->walled_garden = 0; - - if (!s->die) { - /* OK, we're up! */ - u16 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) { - FILE *tables; - int found_nat = 0; + FILE *tables; + int found_nat = 0; - if (!funcs) - return 0; + if (!funcs) + return 0; - p = funcs; + f = funcs; - 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"); + 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"); - fclose(tables); - } + fclose(tables); + } - /* master killed/crashed? */ - if (found_nat) + /* master killed/crashed? */ + if (found_nat) + { + int i; + for (i = 0; down_commands[i] && *down_commands[i]; i++) { - 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]); - } + f->log(3, 0, 0, "Running %s\n", down_commands[i]); + system(down_commands[i]); } + } - return 1; + return 1; } void plugin_done() { - int i; + int i; - if (!iam_master) // Never became master. nothing to do. - return; + 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", down_commands[i]); - system(down_commands[i]); - } + 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]); + } }