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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 | ||
17 | #include "setuid.h" | |
18 | #include "netutil.h" | |
19 | ||
20 | /* | |
21 | This module is responsible for start stop of the vpn system. | |
22 | ||
23 | 1) it allows AH & ESP to get in from interface where a vpn is mounted | |
24 | The NAT traversal is used on the udp 4500 port. | |
25 | ||
26 | 2) it starts the ipsec daemon | |
27 | The RED interface is a problem because it can be up or down a startup. | |
28 | Then, the state change and it must not affect other VPN mounted on | |
29 | other interface. | |
30 | Unfortunatly, openswan 1 cannot do that correctly. It cannot use an | |
31 | interface without restarting everything. | |
32 | ||
33 | */ | |
34 | ||
35 | void usage() { | |
36 | fprintf (stderr, "Usage:\n"); | |
37 | fprintf (stderr, "\tipsecctrl S [connectionkey]\n"); | |
38 | fprintf (stderr, "\tipsecctrl D [connectionkey]\n"); | |
39 | fprintf (stderr, "\tipsecctrl R\n"); | |
40 | fprintf (stderr, "\tipsecctrl I\n"); | |
41 | fprintf (stderr, "\t\tS : Start/Restart Connection\n"); | |
42 | fprintf (stderr, "\t\tD : Stop Connection\n"); | |
43 | fprintf (stderr, "\t\tR : Reload Certificates and Secrets\n"); | |
44 | fprintf (stderr, "\t\tI : Print Statusinfo\n"); | |
45 | } | |
46 | ||
47 | static void ipsec_reload() { | |
48 | /* Re-read all configuration files and secrets and | |
49 | * reload the daemon (#10339). | |
50 | */ | |
51 | safe_system("/usr/sbin/ipsec rereadall >/dev/null 2>&1"); | |
52 | safe_system("/usr/sbin/ipsec reload >/dev/null 2>&1"); | |
53 | } | |
54 | ||
55 | /* | |
56 | ACCEPT the ipsec protocol ah, esp & udp (for nat traversal) on the specified interface | |
57 | */ | |
58 | void open_physical (char *interface, int nat_traversal_port) { | |
59 | char str[STRING_SIZE]; | |
60 | ||
61 | // GRE ??? | |
62 | // sprintf(str, "/sbin/iptables -A " phystable " -p 47 -i %s -j ACCEPT", interface); | |
63 | // safe_system(str); | |
64 | // ESP | |
65 | // sprintf(str, "/sbin/iptables -A " phystable " -p 50 -i %s -j ACCEPT", interface); | |
66 | // safe_system(str); | |
67 | // AH | |
68 | // sprintf(str, "/sbin/iptables -A " phystable " -p 51 -i %s -j ACCEPT", interface); | |
69 | // safe_system(str); | |
70 | // IKE | |
71 | ||
72 | sprintf(str, "/sbin/iptables -D IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT >/dev/null 2>&1", interface); | |
73 | safe_system(str); | |
74 | sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT", interface); | |
75 | safe_system(str); | |
76 | ||
77 | if (! nat_traversal_port) | |
78 | return; | |
79 | ||
80 | sprintf(str, "/sbin/iptables -D IPSECINPUT -p udp -i %s --dport %i -j ACCEPT >/dev/null 2>&1", interface, nat_traversal_port); | |
81 | safe_system(str); | |
82 | sprintf(str, "/sbin/iptables -A IPSECINPUT -p udp -i %s --dport %i -j ACCEPT", interface, nat_traversal_port); | |
83 | safe_system(str); | |
84 | } | |
85 | ||
86 | void ipsec_norules() { | |
87 | /* clear input rules */ | |
88 | safe_system("/sbin/iptables -F IPSECINPUT"); | |
89 | safe_system("/sbin/iptables -F IPSECFORWARD"); | |
90 | safe_system("/sbin/iptables -F IPSECOUTPUT"); | |
91 | } | |
92 | ||
93 | /* | |
94 | return values from the vpn config file or false if not 'on' | |
95 | */ | |
96 | int decode_line (char *s, | |
97 | char **key, | |
98 | char **name, | |
99 | char **type | |
100 | ) { | |
101 | int count = 0; | |
102 | *key = NULL; | |
103 | *name = NULL; | |
104 | *type = NULL; | |
105 | ||
106 | if (s[strlen(s) - 1] == '\n') | |
107 | s[strlen(s) - 1] = '\0'; | |
108 | ||
109 | char *result = strsep(&s, ","); | |
110 | while (result) { | |
111 | if (count == 0) | |
112 | *key = result; | |
113 | if ((count == 1) && strcmp(result, "on") != 0) | |
114 | return 0; // a disabled line | |
115 | if (count == 2) | |
116 | *name = result; | |
117 | if (count == 4) | |
118 | *type = result; | |
119 | count++; | |
120 | result = strsep(&s, ","); | |
121 | } | |
122 | ||
123 | // check other syntax | |
124 | if (! *name) | |
125 | return 0; | |
126 | ||
127 | if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) { | |
128 | fprintf(stderr, "Bad connection name: %s\n", *name); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) { | |
133 | fprintf(stderr, "Bad connection type: %s\n", *type); | |
134 | return 0; | |
135 | } | |
136 | ||
137 | //it's a valid & active line | |
138 | return 1; | |
139 | } | |
140 | ||
141 | /* | |
142 | issue ipsec commmands to turn on connection 'name' | |
143 | */ | |
144 | void turn_connection_on(char *name, char *type) { | |
145 | /* | |
146 | * To bring up a connection, we need to reload the configuration | |
147 | * and issue ipsec up afterwards. To make sure the connection | |
148 | * is not established from the start, we bring it down in advance. | |
149 | */ | |
150 | char command[STRING_SIZE]; | |
151 | ||
152 | // Bring down the connection (if established). | |
153 | snprintf(command, STRING_SIZE - 1, | |
154 | "/usr/sbin/ipsec down %s >/dev/null", name); | |
155 | safe_system(command); | |
156 | ||
157 | // Reload the configuration into the daemon (#10339). | |
158 | ipsec_reload(); | |
159 | ||
160 | // Bring the connection up again. | |
161 | snprintf(command, STRING_SIZE - 1, | |
162 | "/usr/sbin/ipsec up %s >/dev/null", name); | |
163 | safe_system(command); | |
164 | } | |
165 | ||
166 | /* | |
167 | issue ipsec commmands to turn off connection 'name' | |
168 | */ | |
169 | void turn_connection_off (char *name) { | |
170 | /* | |
171 | * To turn off a connection, all SAs must be turned down. | |
172 | * After that, the configuration must be reloaded. | |
173 | */ | |
174 | char command[STRING_SIZE]; | |
175 | ||
176 | // Bring down the connection. | |
177 | snprintf(command, STRING_SIZE - 1, | |
178 | "/usr/sbin/ipsec down %s >/dev/null", name); | |
179 | safe_system(command); | |
180 | ||
181 | // Reload, so the connection is dropped. | |
182 | ipsec_reload(); | |
183 | } | |
184 | ||
185 | int main(int argc, char *argv[]) { | |
186 | char configtype[STRING_SIZE]; | |
187 | char redtype[STRING_SIZE] = ""; | |
188 | struct keyvalue *kv = NULL; | |
189 | ||
190 | if (argc < 2) { | |
191 | usage(); | |
192 | exit(1); | |
193 | } | |
194 | if (!(initsetuid())) | |
195 | exit(1); | |
196 | ||
197 | FILE *file = NULL; | |
198 | ||
199 | ||
200 | if (strcmp(argv[1], "I") == 0) { | |
201 | safe_system("/usr/sbin/ipsec status"); | |
202 | exit(0); | |
203 | } | |
204 | ||
205 | if (strcmp(argv[1], "R") == 0) { | |
206 | ipsec_reload(); | |
207 | exit(0); | |
208 | } | |
209 | ||
210 | /* FIXME: workaround for pclose() issue - still no real idea why | |
211 | * this is happening */ | |
212 | signal(SIGCHLD, SIG_DFL); | |
213 | ||
214 | /* handle operations that doesn't need start the ipsec system */ | |
215 | if (argc == 2) { | |
216 | if (strcmp(argv[1], "D") == 0) { | |
217 | safe_system("/usr/sbin/ipsec stop >/dev/null 2>&1"); | |
218 | ipsec_norules(); | |
219 | exit(0); | |
220 | } | |
221 | } | |
222 | ||
223 | /* read vpn config */ | |
224 | kv=initkeyvalues(); | |
225 | if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings")) | |
226 | { | |
227 | fprintf(stderr, "Cannot read vpn settings\n"); | |
228 | exit(1); | |
229 | } | |
230 | ||
231 | /* check is the vpn system is enabled */ | |
232 | { | |
233 | char s[STRING_SIZE]; | |
234 | findkey(kv, "ENABLED", s); | |
235 | freekeyvalues(kv); | |
236 | if (strcmp (s, "on") != 0) | |
237 | exit(0); | |
238 | } | |
239 | ||
240 | /* read interface settings */ | |
241 | kv=initkeyvalues(); | |
242 | if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings")) | |
243 | { | |
244 | fprintf(stderr, "Cannot read ethernet settings\n"); | |
245 | exit(1); | |
246 | } | |
247 | if (!findkey(kv, "CONFIG_TYPE", configtype)) | |
248 | { | |
249 | fprintf(stderr, "Cannot read CONFIG_TYPE\n"); | |
250 | exit(1); | |
251 | } | |
252 | findkey(kv, "RED_TYPE", redtype); | |
253 | ||
254 | ||
255 | /* Loop through the config file to find physical interface that will accept IPSEC */ | |
256 | int enable_red=0; // states 0: not used | |
257 | int enable_green=0; // 1: error condition | |
258 | int enable_orange=0; // 2: good | |
259 | int enable_blue=0; | |
260 | char if_red[STRING_SIZE] = ""; | |
261 | char if_green[STRING_SIZE] = ""; | |
262 | char if_orange[STRING_SIZE] = ""; | |
263 | char if_blue[STRING_SIZE] = ""; | |
264 | char s[STRING_SIZE]; | |
265 | ||
266 | // when RED is up, find interface name in special file | |
267 | FILE *ifacefile = NULL; | |
268 | if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) { | |
269 | if (fgets(if_red, STRING_SIZE, ifacefile)) { | |
270 | if (if_red[strlen(if_red) - 1] == '\n') | |
271 | if_red[strlen(if_red) - 1] = '\0'; | |
272 | } | |
273 | fclose (ifacefile); | |
274 | ||
275 | if (VALID_DEVICE(if_red)) | |
276 | enable_red++; | |
277 | } | |
278 | ||
279 | // Check if GREEN is enabled. | |
280 | findkey(kv, "GREEN_DEV", if_green); | |
281 | if (VALID_DEVICE(if_green)) | |
282 | enable_green++; | |
283 | ||
284 | // Check if ORANGE is enabled. | |
285 | findkey(kv, "ORANGE_DEV", if_orange); | |
286 | if (VALID_DEVICE(if_orange)) | |
287 | enable_orange++; | |
288 | ||
289 | // Check if BLUE is enabled. | |
290 | findkey(kv, "BLUE_DEV", if_blue); | |
291 | if (VALID_DEVICE(if_blue)) | |
292 | enable_blue++; | |
293 | ||
294 | freekeyvalues(kv); | |
295 | ||
296 | // exit if nothing to do | |
297 | if ((enable_red+enable_green+enable_orange+enable_blue) == 0) | |
298 | exit(0); | |
299 | ||
300 | // open needed ports | |
301 | if (enable_red > 0) | |
302 | open_physical(if_red, 4500); | |
303 | ||
304 | if (enable_green > 0) | |
305 | open_physical(if_green, 4500); | |
306 | ||
307 | if (enable_orange > 0) | |
308 | open_physical(if_orange, 4500); | |
309 | ||
310 | if (enable_blue > 0) | |
311 | open_physical(if_blue, 4500); | |
312 | ||
313 | // start the system | |
314 | if ((argc == 2) && strcmp(argv[1], "S") == 0) { | |
315 | safe_system("/usr/sbin/ipsec restart >/dev/null"); | |
316 | exit(0); | |
317 | } | |
318 | ||
319 | // it is a selective start or stop | |
320 | // second param is only a number 'key' | |
321 | if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) { | |
322 | fprintf(stderr, "Bad arg: %s\n", argv[2]); | |
323 | usage(); | |
324 | exit(1); | |
325 | } | |
326 | ||
327 | // search the vpn pointed by 'key' | |
328 | if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) { | |
329 | fprintf(stderr, "Couldn't open vpn settings file"); | |
330 | exit(1); | |
331 | } | |
332 | while (fgets(s, STRING_SIZE, file) != NULL) { | |
333 | char *key; | |
334 | char *name; | |
335 | char *type; | |
336 | if (!decode_line(s,&key,&name,&type)) | |
337 | continue; | |
338 | ||
339 | // is it the 'key' requested ? | |
340 | if (strcmp(argv[2], key) != 0) | |
341 | continue; | |
342 | ||
343 | // Start or Delete this Connection | |
344 | if (strcmp(argv[1], "S") == 0) | |
345 | turn_connection_on (name, type); | |
346 | else if (strcmp(argv[1], "D") == 0) | |
347 | turn_connection_off (name); | |
348 | else { | |
349 | fprintf(stderr, "Bad command\n"); | |
350 | exit(1); | |
351 | } | |
352 | } | |
353 | fclose(file); | |
354 | ||
355 | return 0; | |
356 | } |