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Commit | Line | Data |
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1 | /* | |
2 | * | |
3 | * File originally from the Smoothwall project | |
4 | * (c) 2001 Smoothwall Team | |
5 | * | |
6 | */ | |
7 | ||
8 | #include "libsmooth.h" | |
9 | #include <stdio.h> | |
10 | #include <stdlib.h> | |
11 | #include <string.h> | |
12 | #include <unistd.h> | |
13 | #include <sys/types.h> | |
14 | #include <sys/stat.h> | |
15 | #include <signal.h> | |
16 | #include "setuid.h" | |
17 | ||
18 | /* | |
19 | This module is responsible for start stop of the vpn system. | |
20 | ||
21 | 1) it allows AH & ESP to get in from interface where a vpn is mounted | |
22 | The NAT traversal is used on the udp 4500 port. | |
23 | ||
24 | 2) it starts the ipsec daemon | |
25 | The RED interface is a problem because it can be up or down a startup. | |
26 | Then, the state change and it must not affect other VPN mounted on | |
27 | other interface. | |
28 | Unfortunatly, openswan 1 cannot do that correctly. It cannot use an | |
29 | interface without restarting everything. | |
30 | ||
31 | */ | |
32 | ||
33 | void usage() { | |
34 | fprintf (stderr, "Usage:\n"); | |
35 | fprintf (stderr, "\tipsecctrl S [connectionkey]\n"); | |
36 | fprintf (stderr, "\tipsecctrl D [connectionkey]\n"); | |
37 | fprintf (stderr, "\tipsecctrl R\n"); | |
38 | fprintf (stderr, "\tipsecctrl I\n"); | |
39 | fprintf (stderr, "\t\tS : Start/Restart Connection\n"); | |
40 | fprintf (stderr, "\t\tD : Stop Connection\n"); | |
41 | fprintf (stderr, "\t\tR : Reload Certificates and Secrets\n"); | |
42 | fprintf (stderr, "\t\tI : Print Statusinfo\n"); | |
43 | } | |
44 | ||
45 | /* | |
46 | ACCEPT the ipsec protocol ah, esp & udp (for nat traversal) on the specified interface | |
47 | */ | |
48 | void open_physical (char *interface, int nat_traversal_port) { | |
49 | char str[STRING_SIZE]; | |
50 | ||
51 | // GRE ??? | |
52 | // sprintf(str, "/sbin/iptables -A " phystable " -p 47 -i %s -j ACCEPT", interface); | |
53 | // safe_system(str); | |
54 | // ESP | |
55 | // sprintf(str, "/sbin/iptables -A " phystable " -p 50 -i %s -j ACCEPT", interface); | |
56 | // safe_system(str); | |
57 | // AH | |
58 | // sprintf(str, "/sbin/iptables -A " phystable " -p 51 -i %s -j ACCEPT", interface); | |
59 | // safe_system(str); | |
60 | // IKE | |
61 | ||
62 | sprintf(str, "/sbin/iptables -D IPSECINPUT -p udp -i %s --sport 500 --dport 500 -j ACCEPT >/dev/null 2>&1", interface); | |
63 | safe_system(str); | |
64 | sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --sport 500 --dport 500 -j ACCEPT", interface); | |
65 | safe_system(str); | |
66 | ||
67 | if (! nat_traversal_port) | |
68 | return; | |
69 | ||
70 | sprintf(str, "/sbin/iptables -D IPSECINPUT -p udp -i %s --dport %i -j ACCEPT >/dev/null 2>&1", interface, nat_traversal_port); | |
71 | safe_system(str); | |
72 | sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --dport %i -j ACCEPT", interface, nat_traversal_port); | |
73 | safe_system(str); | |
74 | } | |
75 | ||
76 | void ipsec_norules() { | |
77 | /* clear input rules */ | |
78 | safe_system("/sbin/iptables -F IPSECINPUT"); | |
79 | safe_system("/sbin/iptables -F IPSECFORWARD"); | |
80 | safe_system("/sbin/iptables -F IPSECOUTPUT"); | |
81 | ||
82 | } | |
83 | ||
84 | /* | |
85 | return values from the vpn config file or false if not 'on' | |
86 | */ | |
87 | int decode_line (char *s, | |
88 | char **key, | |
89 | char **name, | |
90 | char **type, | |
91 | char **interface | |
92 | ) { | |
93 | int count = 0; | |
94 | *key = NULL; | |
95 | *name = NULL; | |
96 | *type = NULL; | |
97 | ||
98 | if (s[strlen(s) - 1] == '\n') | |
99 | s[strlen(s) - 1] = '\0'; | |
100 | ||
101 | char *result = strsep(&s, ","); | |
102 | while (result) { | |
103 | if (count == 0) | |
104 | *key = result; | |
105 | if ((count == 1) && strcmp(result, "on") != 0) | |
106 | return 0; // a disabled line | |
107 | if (count == 2) | |
108 | *name = result; | |
109 | if (count == 4) | |
110 | *type = result; | |
111 | if (count == 27) | |
112 | *interface = result; | |
113 | count++; | |
114 | result = strsep(&s, ","); | |
115 | } | |
116 | ||
117 | // check other syntax | |
118 | if (! *name) | |
119 | return 0; | |
120 | ||
121 | if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) { | |
122 | fprintf(stderr, "Bad connection name: %s\n", *name); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) { | |
127 | fprintf(stderr, "Bad connection type: %s\n", *type); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | if (! (strcmp(*interface, "RED") == 0 || strcmp(*interface, "GREEN") == 0 || | |
132 | strcmp(*interface, "ORANGE") == 0 || strcmp(*interface, "BLUE") == 0)) { | |
133 | fprintf(stderr, "Bad interface name: %s\n", *interface); | |
134 | return 0; | |
135 | } | |
136 | //it's a valid & active line | |
137 | return 1; | |
138 | } | |
139 | ||
140 | /* | |
141 | issue ipsec commmands to turn on connection 'name' | |
142 | */ | |
143 | void turn_connection_on (char *name, char *type) { | |
144 | char command[STRING_SIZE]; | |
145 | if (file = fopen("/var/run/vpn-watch.pid", "r")) { | |
146 | safe_system("kill -9 $(cat /var/run/vpn-watch.pid)"); | |
147 | safe_system("unlink /var/run/vpn-watch.pid"); | |
148 | close(file); | |
149 | } | |
150 | safe_system("/etc/rc.d/init.d/ipsec restart >/dev/null"); | |
151 | safe_system("/usr/local/bin/vpn-watch &"); | |
152 | } | |
153 | /* | |
154 | issue ipsec commmands to turn off connection 'name' | |
155 | */ | |
156 | void turn_connection_off (char *name) { | |
157 | char command[STRING_SIZE]; | |
158 | memset(command, 0, STRING_SIZE); | |
159 | snprintf(command, STRING_SIZE - 1, | |
160 | "/usr/sbin/ipsec whack --delete --name %s >/dev/null", name); | |
161 | safe_system(command); | |
162 | safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null"); | |
163 | } | |
164 | ||
165 | ||
166 | int main(int argc, char *argv[]) { | |
167 | ||
168 | char configtype[STRING_SIZE]; | |
169 | char redtype[STRING_SIZE] = ""; | |
170 | struct keyvalue *kv = NULL; | |
171 | ||
172 | if (argc < 2) { | |
173 | usage(); | |
174 | exit(1); | |
175 | } | |
176 | if (!(initsetuid())) | |
177 | exit(1); | |
178 | ||
179 | FILE *file = NULL; | |
180 | ||
181 | ||
182 | if (strcmp(argv[1], "I") == 0) { | |
183 | safe_system("/usr/sbin/ipsec whack --status"); | |
184 | exit(0); | |
185 | } | |
186 | ||
187 | if (strcmp(argv[1], "R") == 0) { | |
188 | safe_system("/usr/sbin/ipsec whack --rereadall >/dev/null"); | |
189 | exit(0); | |
190 | } | |
191 | ||
192 | /* Get vpnwatch pid */ | |
193 | ||
194 | ||
195 | /* FIXME: workaround for pclose() issue - still no real idea why | |
196 | * this is happening */ | |
197 | signal(SIGCHLD, SIG_DFL); | |
198 | ||
199 | /* handle operations that doesn't need start the ipsec system */ | |
200 | if (argc == 2) { | |
201 | if (strcmp(argv[1], "D") == 0) { | |
202 | /* Only shutdown pluto if it really is running */ | |
203 | /* Get pluto pid */ | |
204 | if (file = fopen("/var/run/pluto.pid", "r")) { | |
205 | safe_system("/etc/rc.d/init.d/ipsec stop 2> /dev/null >/dev/null"); | |
206 | close(file); | |
207 | } | |
208 | ipsec_norules(); | |
209 | exit(0); | |
210 | } | |
211 | ||
212 | } | |
213 | ||
214 | /* read vpn config */ | |
215 | kv=initkeyvalues(); | |
216 | if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings")) | |
217 | { | |
218 | fprintf(stderr, "Cannot read vpn settings\n"); | |
219 | exit(1); | |
220 | } | |
221 | ||
222 | /* check is the vpn system is enabled */ | |
223 | { | |
224 | char s[STRING_SIZE]; | |
225 | findkey(kv, "ENABLED", s); | |
226 | freekeyvalues(kv); | |
227 | if (strcmp (s, "on") != 0) | |
228 | exit(0); | |
229 | } | |
230 | ||
231 | /* read interface settings */ | |
232 | kv=initkeyvalues(); | |
233 | if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings")) | |
234 | { | |
235 | fprintf(stderr, "Cannot read ethernet settings\n"); | |
236 | exit(1); | |
237 | } | |
238 | if (!findkey(kv, "CONFIG_TYPE", configtype)) | |
239 | { | |
240 | fprintf(stderr, "Cannot read CONFIG_TYPE\n"); | |
241 | exit(1); | |
242 | } | |
243 | findkey(kv, "RED_TYPE", redtype); | |
244 | ||
245 | ||
246 | /* Loop through the config file to find physical interface that will accept IPSEC */ | |
247 | int enable_red=0; // states 0: not used | |
248 | int enable_green=0; // 1: error condition | |
249 | int enable_orange=0; // 2: good | |
250 | int enable_blue=0; | |
251 | char if_red[STRING_SIZE] = ""; | |
252 | char if_green[STRING_SIZE] = ""; | |
253 | char if_orange[STRING_SIZE] = ""; | |
254 | char if_blue[STRING_SIZE] = ""; | |
255 | char s[STRING_SIZE]; | |
256 | ||
257 | if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) { | |
258 | fprintf(stderr, "Couldn't open vpn settings file"); | |
259 | exit(1); | |
260 | } | |
261 | while (fgets(s, STRING_SIZE, file) != NULL) { | |
262 | char *key; | |
263 | char *name; | |
264 | char *type; | |
265 | char *interface; | |
266 | if (!decode_line(s,&key,&name,&type,&interface)) | |
267 | continue; | |
268 | /* search interface */ | |
269 | if (!enable_red && strcmp (interface, "RED") == 0) { | |
270 | // when RED is up, find interface name in special file | |
271 | FILE *ifacefile = NULL; | |
272 | if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) { | |
273 | if (fgets(if_red, STRING_SIZE, ifacefile)) { | |
274 | if (if_red[strlen(if_red) - 1] == '\n') | |
275 | if_red[strlen(if_red) - 1] = '\0'; | |
276 | } | |
277 | fclose (ifacefile); | |
278 | ||
279 | if (VALID_DEVICE(if_red)) | |
280 | enable_red+=2; // present and running | |
281 | } | |
282 | } | |
283 | ||
284 | if (!enable_green && strcmp (interface, "GREEN") == 0) { | |
285 | enable_green = 1; | |
286 | findkey(kv, "GREEN_DEV", if_green); | |
287 | if (VALID_DEVICE(if_green)) | |
288 | enable_green++; | |
289 | else | |
290 | fprintf(stderr, "IPSec enabled on green but green interface is invalid or not found\n"); | |
291 | } | |
292 | ||
293 | if (!enable_orange && strcmp (interface, "ORANGE") == 0) { | |
294 | enable_orange = 1; | |
295 | findkey(kv, "ORANGE_DEV", if_orange); | |
296 | if (VALID_DEVICE(if_orange)) | |
297 | enable_orange++; | |
298 | else | |
299 | fprintf(stderr, "IPSec enabled on orange but orange interface is invalid or not found\n"); | |
300 | } | |
301 | ||
302 | if (!enable_blue && strcmp (interface, "BLUE") == 0) { | |
303 | enable_blue++; | |
304 | findkey(kv, "BLUE_DEV", if_blue); | |
305 | if (VALID_DEVICE(if_blue)) | |
306 | enable_blue++; | |
307 | else | |
308 | fprintf(stderr, "IPSec enabled on blue but blue interface is invalid or not found\n"); | |
309 | ||
310 | } | |
311 | } | |
312 | fclose(file); | |
313 | freekeyvalues(kv); | |
314 | ||
315 | // do nothing if something is in error condition | |
316 | if ((enable_red==1) || (enable_green==1) || (enable_orange==1) || (enable_blue==1) ) | |
317 | exit(1); | |
318 | ||
319 | // exit if nothing to do | |
320 | if ( (enable_red+enable_green+enable_orange+enable_blue) == 0 ) | |
321 | exit(0); | |
322 | ||
323 | // open needed ports | |
324 | // todo: read a nat_t indicator to allow or not openning UDP/4500 | |
325 | if (enable_red==2) | |
326 | open_physical(if_red, 4500); | |
327 | ||
328 | if (enable_green==2) | |
329 | open_physical(if_green, 4500); | |
330 | ||
331 | if (enable_orange==2) | |
332 | open_physical(if_orange, 4500); | |
333 | ||
334 | if (enable_blue==2) | |
335 | open_physical(if_blue, 4500); | |
336 | ||
337 | // start the system | |
338 | if ((argc == 2) && strcmp(argv[1], "S") == 0) { | |
339 | exit(0); | |
340 | } | |
341 | ||
342 | // it is a selective start or stop | |
343 | // second param is only a number 'key' | |
344 | if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) { | |
345 | fprintf(stderr, "Bad arg\n"); | |
346 | usage(); | |
347 | exit(1); | |
348 | } | |
349 | ||
350 | // search the vpn pointed by 'key' | |
351 | if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) { | |
352 | fprintf(stderr, "Couldn't open vpn settings file"); | |
353 | exit(1); | |
354 | } | |
355 | while (fgets(s, STRING_SIZE, file) != NULL) { | |
356 | char *key; | |
357 | char *name; | |
358 | char *type; | |
359 | char *interface; | |
360 | if (!decode_line(s,&key,&name,&type,&interface)) | |
361 | continue; | |
362 | ||
363 | // start/stop a vpn if belonging to specified interface | |
364 | if (strcmp(argv[1], interface) == 0 ) { | |
365 | if (strcmp(argv[2], "0")==0) | |
366 | turn_connection_off (name); | |
367 | else | |
368 | turn_connection_on (name, type); | |
369 | continue; | |
370 | } | |
371 | // is it the 'key' requested ? | |
372 | if (strcmp(argv[2], key) != 0) | |
373 | continue; | |
374 | // Start or Delete this Connection | |
375 | if (strcmp(argv[1], "S") == 0) | |
376 | turn_connection_on (name, type); | |
377 | else | |
378 | if (strcmp(argv[1], "D") == 0) | |
379 | turn_connection_off (name); | |
380 | else { | |
381 | fprintf(stderr, "Bad command\n"); | |
382 | exit(1); | |
383 | } | |
384 | } | |
385 | fclose(file); | |
386 | return 0; | |
387 | } |