059a001698e8900d909be26255c1a24faa20a9a8
12 char const *cvs_id
= "$Id: garden.c,v 1.16 2004/11/18 06:41:03 bodea Exp $";
14 int plugin_api_version
= PLUGIN_API_VERSION
;
15 static struct pluginfuncs
*p
= 0;
17 static int iam_master
= 0; // We're all slaves! Slaves I tell you!
19 char *up_commands
[] = {
20 "iptables -t nat -N garden >/dev/null 2>&1", // Create a chain that all gardened users will go through
21 "iptables -t nat -F garden",
22 ". " PLUGINCONF
"/build-garden", // Populate with site-specific DNAT rules
23 "iptables -t nat -N garden_users >/dev/null 2>&1", // Empty chain, users added/removed by garden_session
24 "iptables -t nat -F garden_users",
25 "iptables -t nat -A PREROUTING -j garden_users", // DNAT any users on the garden_users chain
26 "sysctl -w net.ipv4.ip_conntrack_max=256000 >/dev/null", // lots of entries
30 char *down_commands
[] = {
31 "iptables -t nat -F PREROUTING",
32 "iptables -t nat -F garden_users",
33 "iptables -t nat -X garden_users",
34 "iptables -t nat -F garden",
35 "iptables -t nat -X garden",
36 "rmmod iptable_nat", // Should also remove ip_conntrack, but
37 // doing so can take hours... literally.
38 // If a master is re-started as a slave,
39 // either rmmod manually, or reboot.
43 int garden_session(sessiont
*s
, int flag
);
45 int plugin_post_auth(struct param_post_auth
*data
)
47 // Ignore if user authentication was successful
48 if (data
->auth_allowed
) return PLUGIN_RET_OK
;
50 p
->log(3, 0, 0, 0, "Walled Garden allowing login\n");
51 data
->auth_allowed
= 1;
52 data
->s
->walled_garden
= 1;
56 int plugin_new_session(struct param_new_session
*data
)
59 return PLUGIN_RET_OK
; // Slaves don't do walled garden processing.
61 if (data
->s
->walled_garden
)
62 garden_session(data
->s
, 1);
67 int plugin_kill_session(struct param_new_session
*data
)
70 return PLUGIN_RET_OK
; // Slaves don't do walled garden processing.
72 if (data
->s
->walled_garden
)
73 garden_session(data
->s
, 0);
78 char *plugin_control_help
[] = {
79 " garden USER|SID Put user into the walled garden",
80 " ungarden SID Release session from garden",
84 int plugin_control(struct param_control
*data
)
94 if (strcmp(data
->argv
[0], "garden") && strcmp(data
->argv
[0], "ungarden"))
95 return PLUGIN_RET_OK
; // not for us
98 return PLUGIN_RET_NOTMASTER
;
100 flag
= data
->argv
[0][0] != 'u';
104 data
->response
= NSCTL_RES_ERR
;
105 data
->additional
= "one argument required: username or session id";
106 return PLUGIN_RET_STOP
;
109 if (!(session
= strtol(data
->argv
[1], &end
, 10)) || *end
)
112 session
= p
->get_session_by_username(data
->argv
[1]);
114 session
= 0; // can't ungarden by username
118 s
= p
->get_session_by_id(session
);
122 data
->response
= NSCTL_RES_ERR
;
123 data
->additional
= "session not found";
124 return PLUGIN_RET_STOP
;
127 if (s
->walled_garden
== flag
)
129 data
->response
= NSCTL_RES_ERR
;
130 data
->additional
= flag
? "already in walled garden" : "not in walled garden";
131 return PLUGIN_RET_STOP
;
134 garden_session(s
, flag
);
135 p
->session_changed(session
);
137 data
->response
= NSCTL_RES_OK
;
138 data
->additional
= 0;
140 return PLUGIN_RET_STOP
;
143 int plugin_become_master(void)
146 iam_master
= 1; // We just became the master. Wow!
148 for (i
= 0; up_commands
[i
] && *up_commands
[i
]; i
++)
150 p
->log(3, 0, 0, 0, "Running %s\n", up_commands
[i
]);
151 system(up_commands
[i
]);
154 return PLUGIN_RET_OK
;
157 // Called for each active session after becoming master
158 int plugin_new_session_master(sessiont
*s
)
160 if (s
->walled_garden
)
162 s
->walled_garden
= 0;
163 garden_session(s
, 1);
166 return PLUGIN_RET_OK
;
169 int garden_session(sessiont
*s
, int flag
)
174 if (!s
->opened
) return 0;
178 p
->log(2, 0, 0, s
->tunnel
, "Garden user %s (%s)\n", s
->user
, p
->inet_toa(htonl(s
->ip
)));
179 snprintf(cmd
, sizeof(cmd
), "iptables -t nat -A garden_users -s %s -j garden", p
->inet_toa(htonl(s
->ip
)));
180 p
->log(3, 0, 0, s
->tunnel
, "%s\n", cmd
);
182 s
->walled_garden
= 1;
190 p
->log(2, 0, 0, s
->tunnel
, "Un-Garden user %s (%s)\n", s
->user
, p
->inet_toa(htonl(s
->ip
)));
191 // Kick off any duplicate usernames
192 // but make sure not to kick off ourself
193 if (s
->ip
&& !s
->die
&& (other
= p
->get_session_by_username(s
->user
)) && s
!= p
->get_session_by_id(other
)) {
194 p
->sessionkill(other
, "Duplicate session when user released from walled garden");
196 /* Clean up counters */
197 s
->cin
= s
->cout
= 0;
198 s
->pin
= s
->pout
= 0;
200 snprintf(cmd
, sizeof(cmd
), "iptables -t nat -D garden_users -s %s -j garden", p
->inet_toa(htonl(s
->ip
)));
201 p
->log(3, 0, 0, s
->tunnel
, "%s\n", cmd
);
204 int status
= system(cmd
);
205 if (WEXITSTATUS(status
) != 0) break;
208 s
->walled_garden
= 0;
212 u16 r
= p
->radiusnew(p
->get_id_by_session(s
));
213 p
->radiussend(r
, RADIUSSTART
);
216 s
->walled_garden
= flag
;
220 int plugin_init(struct pluginfuncs
*funcs
)
230 if ((tables
= fopen("/proc/net/ip_tables_names", "r")))
233 while (fgets(buf
, sizeof(buf
), tables
) && !found_nat
)
234 found_nat
= !strcmp(buf
, "nat\n");
239 /* master killed/crashed? */
243 for (i
= 0; down_commands
[i
] && *down_commands
[i
]; i
++)
245 p
->log(3, 0, 0, 0, "Running %s\n", down_commands
[i
]);
246 system(down_commands
[i
]);
257 if (!iam_master
) // Never became master. nothing to do.
260 for (i
= 0; down_commands
[i
] && *down_commands
[i
]; i
++)
262 p
->log(3, 0, 0, 0, "Running %s\n", down_commands
[i
]);
263 system(down_commands
[i
]);