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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 | // IKE | |
62 | sprintf(str, "/sbin/iptables --wait -D IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT >/dev/null 2>&1", interface); | |
63 | safe_system(str); | |
64 | sprintf(str, "/sbin/iptables --wait -A IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT", interface); | |
65 | safe_system(str); | |
66 | ||
67 | if (! nat_traversal_port) | |
68 | return; | |
69 | ||
70 | sprintf(str, "/sbin/iptables --wait -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 --wait -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 --wait -F IPSECINPUT"); | |
79 | safe_system("/sbin/iptables --wait -F IPSECFORWARD"); | |
80 | safe_system("/sbin/iptables --wait -F IPSECOUTPUT"); | |
81 | } | |
82 | ||
83 | /* | |
84 | return values from the vpn config file or false if not 'on' | |
85 | */ | |
86 | int decode_line (char *s, | |
87 | char **key, | |
88 | char **name, | |
89 | char **type | |
90 | ) { | |
91 | int count = 0; | |
92 | *key = NULL; | |
93 | *name = NULL; | |
94 | *type = NULL; | |
95 | ||
96 | if (s[strlen(s) - 1] == '\n') | |
97 | s[strlen(s) - 1] = '\0'; | |
98 | ||
99 | char *result = strsep(&s, ","); | |
100 | while (result) { | |
101 | if (count == 0) | |
102 | *key = result; | |
103 | if ((count == 1) && strcmp(result, "on") != 0) | |
104 | return 0; // a disabled line | |
105 | if (count == 2) | |
106 | *name = result; | |
107 | if (count == 4) | |
108 | *type = result; | |
109 | count++; | |
110 | result = strsep(&s, ","); | |
111 | } | |
112 | ||
113 | // check other syntax | |
114 | if (! *name) | |
115 | return 0; | |
116 | ||
117 | if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) { | |
118 | fprintf(stderr, "Bad connection name: %s\n", *name); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) { | |
123 | fprintf(stderr, "Bad connection type: %s\n", *type); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | //it's a valid & active line | |
128 | return 1; | |
129 | } | |
130 | ||
131 | /* | |
132 | issue ipsec commmands to turn on connection 'name' | |
133 | */ | |
134 | void turn_connection_on(char *name, char *type) { | |
135 | /* | |
136 | * To bring up a connection, we need to reload the configuration | |
137 | * and issue ipsec up afterwards. To make sure the connection | |
138 | * is not established from the start, we bring it down in advance. | |
139 | */ | |
140 | char command[STRING_SIZE]; | |
141 | ||
142 | // Bring down the connection (if established). | |
143 | snprintf(command, STRING_SIZE - 1, | |
144 | "/usr/sbin/ipsec down %s >/dev/null", name); | |
145 | safe_system(command); | |
146 | ||
147 | // Reload the configuration into the daemon (#10339). | |
148 | ipsec_reload(); | |
149 | ||
150 | // Bring the connection up again. | |
151 | snprintf(command, STRING_SIZE - 1, | |
152 | "/usr/sbin/ipsec up %s >/dev/null", name); | |
153 | safe_system(command); | |
154 | } | |
155 | ||
156 | /* | |
157 | issue ipsec commmands to turn off connection 'name' | |
158 | */ | |
159 | void turn_connection_off (char *name) { | |
160 | /* | |
161 | * To turn off a connection, all SAs must be turned down. | |
162 | * After that, the configuration must be reloaded. | |
163 | */ | |
164 | char command[STRING_SIZE]; | |
165 | ||
166 | // Bring down the connection. | |
167 | snprintf(command, STRING_SIZE - 1, | |
168 | "/usr/sbin/ipsec down %s >/dev/null", name); | |
169 | safe_system(command); | |
170 | ||
171 | // Reload, so the connection is dropped. | |
172 | ipsec_reload(); | |
173 | } | |
174 | ||
175 | int main(int argc, char *argv[]) { | |
176 | char configtype[STRING_SIZE]; | |
177 | char redtype[STRING_SIZE] = ""; | |
178 | struct keyvalue *kv = NULL; | |
179 | ||
180 | if (argc < 2) { | |
181 | usage(); | |
182 | exit(1); | |
183 | } | |
184 | if (!(initsetuid())) | |
185 | exit(1); | |
186 | ||
187 | FILE *file = NULL; | |
188 | ||
189 | ||
190 | if (strcmp(argv[1], "I") == 0) { | |
191 | safe_system("/usr/sbin/ipsec status"); | |
192 | exit(0); | |
193 | } | |
194 | ||
195 | if (strcmp(argv[1], "R") == 0) { | |
196 | ipsec_reload(); | |
197 | exit(0); | |
198 | } | |
199 | ||
200 | /* FIXME: workaround for pclose() issue - still no real idea why | |
201 | * this is happening */ | |
202 | signal(SIGCHLD, SIG_DFL); | |
203 | ||
204 | /* handle operations that doesn't need start the ipsec system */ | |
205 | if (argc == 2) { | |
206 | if (strcmp(argv[1], "D") == 0) { | |
207 | safe_system("/usr/sbin/ipsec stop >/dev/null 2>&1"); | |
208 | ipsec_norules(); | |
209 | exit(0); | |
210 | } | |
211 | } | |
212 | ||
213 | /* read vpn config */ | |
214 | kv=initkeyvalues(); | |
215 | if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings")) | |
216 | { | |
217 | fprintf(stderr, "Cannot read vpn settings\n"); | |
218 | exit(1); | |
219 | } | |
220 | ||
221 | /* check is the vpn system is enabled */ | |
222 | { | |
223 | char s[STRING_SIZE]; | |
224 | findkey(kv, "ENABLED", s); | |
225 | freekeyvalues(kv); | |
226 | if (strcmp (s, "on") != 0) | |
227 | exit(0); | |
228 | } | |
229 | ||
230 | /* read interface settings */ | |
231 | kv=initkeyvalues(); | |
232 | if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings")) | |
233 | { | |
234 | fprintf(stderr, "Cannot read ethernet settings\n"); | |
235 | exit(1); | |
236 | } | |
237 | if (!findkey(kv, "CONFIG_TYPE", configtype)) | |
238 | { | |
239 | fprintf(stderr, "Cannot read CONFIG_TYPE\n"); | |
240 | exit(1); | |
241 | } | |
242 | findkey(kv, "RED_TYPE", redtype); | |
243 | ||
244 | ||
245 | /* Loop through the config file to find physical interface that will accept IPSEC */ | |
246 | int enable_red=0; // states 0: not used | |
247 | int enable_green=0; // 1: error condition | |
248 | int enable_orange=0; // 2: good | |
249 | int enable_blue=0; | |
250 | char if_red[STRING_SIZE] = ""; | |
251 | char if_green[STRING_SIZE] = ""; | |
252 | char if_orange[STRING_SIZE] = ""; | |
253 | char if_blue[STRING_SIZE] = ""; | |
254 | char s[STRING_SIZE]; | |
255 | ||
256 | // when RED is up, find interface name in special file | |
257 | FILE *ifacefile = NULL; | |
258 | if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) { | |
259 | if (fgets(if_red, STRING_SIZE, ifacefile)) { | |
260 | if (if_red[strlen(if_red) - 1] == '\n') | |
261 | if_red[strlen(if_red) - 1] = '\0'; | |
262 | } | |
263 | fclose (ifacefile); | |
264 | ||
265 | if (VALID_DEVICE(if_red)) | |
266 | enable_red++; | |
267 | } | |
268 | ||
269 | // Check if GREEN is enabled. | |
270 | findkey(kv, "GREEN_DEV", if_green); | |
271 | if (VALID_DEVICE(if_green)) | |
272 | enable_green++; | |
273 | ||
274 | // Check if ORANGE is enabled. | |
275 | findkey(kv, "ORANGE_DEV", if_orange); | |
276 | if (VALID_DEVICE(if_orange)) | |
277 | enable_orange++; | |
278 | ||
279 | // Check if BLUE is enabled. | |
280 | findkey(kv, "BLUE_DEV", if_blue); | |
281 | if (VALID_DEVICE(if_blue)) | |
282 | enable_blue++; | |
283 | ||
284 | freekeyvalues(kv); | |
285 | ||
286 | // exit if nothing to do | |
287 | if ((enable_red+enable_green+enable_orange+enable_blue) == 0) | |
288 | exit(0); | |
289 | ||
290 | // open needed ports | |
291 | if (enable_red > 0) | |
292 | open_physical(if_red, 4500); | |
293 | ||
294 | if (enable_green > 0) | |
295 | open_physical(if_green, 4500); | |
296 | ||
297 | if (enable_orange > 0) | |
298 | open_physical(if_orange, 4500); | |
299 | ||
300 | if (enable_blue > 0) | |
301 | open_physical(if_blue, 4500); | |
302 | ||
303 | // start the system | |
304 | if ((argc == 2) && strcmp(argv[1], "S") == 0) { | |
305 | safe_system("/usr/sbin/ipsec restart >/dev/null"); | |
306 | exit(0); | |
307 | } | |
308 | ||
309 | // it is a selective start or stop | |
310 | // second param is only a number 'key' | |
311 | if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) { | |
312 | fprintf(stderr, "Bad arg: %s\n", argv[2]); | |
313 | usage(); | |
314 | exit(1); | |
315 | } | |
316 | ||
317 | // search the vpn pointed by 'key' | |
318 | if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) { | |
319 | fprintf(stderr, "Couldn't open vpn settings file"); | |
320 | exit(1); | |
321 | } | |
322 | while (fgets(s, STRING_SIZE, file) != NULL) { | |
323 | char *key; | |
324 | char *name; | |
325 | char *type; | |
326 | if (!decode_line(s,&key,&name,&type)) | |
327 | continue; | |
328 | ||
329 | // is it the 'key' requested ? | |
330 | if (strcmp(argv[2], key) != 0) | |
331 | continue; | |
332 | ||
333 | // Start or Delete this Connection | |
334 | if (strcmp(argv[1], "S") == 0) | |
335 | turn_connection_on (name, type); | |
336 | else if (strcmp(argv[1], "D") == 0) | |
337 | turn_connection_off (name); | |
338 | else { | |
339 | fprintf(stderr, "Bad command\n"); | |
340 | exit(1); | |
341 | } | |
342 | } | |
343 | fclose(file); | |
344 | ||
345 | return 0; | |
346 | } |