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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 | return values from the vpn config file or false if not 'on' | |
57 | */ | |
58 | int decode_line (char *s, | |
59 | char **key, | |
60 | char **name, | |
61 | char **type | |
62 | ) { | |
63 | int count = 0; | |
64 | *key = NULL; | |
65 | *name = NULL; | |
66 | *type = NULL; | |
67 | ||
68 | if (s[strlen(s) - 1] == '\n') | |
69 | s[strlen(s) - 1] = '\0'; | |
70 | ||
71 | char *result = strsep(&s, ","); | |
72 | while (result) { | |
73 | if (count == 0) | |
74 | *key = result; | |
75 | if ((count == 1) && strcmp(result, "on") != 0) | |
76 | return 0; // a disabled line | |
77 | if (count == 2) | |
78 | *name = result; | |
79 | if (count == 4) | |
80 | *type = result; | |
81 | count++; | |
82 | result = strsep(&s, ","); | |
83 | } | |
84 | ||
85 | // check other syntax | |
86 | if (! *name) | |
87 | return 0; | |
88 | ||
89 | if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) { | |
90 | fprintf(stderr, "Bad connection name: %s\n", *name); | |
91 | return 0; | |
92 | } | |
93 | ||
94 | if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) { | |
95 | fprintf(stderr, "Bad connection type: %s\n", *type); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | //it's a valid & active line | |
100 | return 1; | |
101 | } | |
102 | ||
103 | /* | |
104 | issue ipsec commmands to turn on connection 'name' | |
105 | */ | |
106 | void turn_connection_on(char *name, char *type) { | |
107 | /* | |
108 | * To bring up a connection, we need to reload the configuration | |
109 | * and issue ipsec up afterwards. To make sure the connection | |
110 | * is not established from the start, we bring it down in advance. | |
111 | */ | |
112 | char command[STRING_SIZE]; | |
113 | ||
114 | // Bring down the connection (if established). | |
115 | snprintf(command, STRING_SIZE - 1, | |
116 | "/usr/sbin/ipsec down %s >/dev/null", name); | |
117 | safe_system(command); | |
118 | ||
119 | // Reload the IPsec firewall policy | |
120 | safe_system("/usr/lib/firewall/ipsec-policy >/dev/null"); | |
121 | ||
122 | // Create or destroy interfaces | |
123 | safe_system("/usr/local/bin/ipsec-interfaces >/dev/null"); | |
124 | ||
125 | // Reload the configuration into the daemon (#10339). | |
126 | ipsec_reload(); | |
127 | ||
128 | // Bring the connection up again. | |
129 | snprintf(command, STRING_SIZE - 1, | |
130 | "/usr/sbin/ipsec stroke up-nb %s >/dev/null", name); | |
131 | safe_system(command); | |
132 | } | |
133 | ||
134 | /* | |
135 | issue ipsec commmands to turn off connection 'name' | |
136 | */ | |
137 | void turn_connection_off (char *name) { | |
138 | /* | |
139 | * To turn off a connection, all SAs must be turned down. | |
140 | * After that, the configuration must be reloaded. | |
141 | */ | |
142 | char command[STRING_SIZE]; | |
143 | ||
144 | // Reload, so the connection is dropped. | |
145 | ipsec_reload(); | |
146 | ||
147 | // Bring down the connection. | |
148 | snprintf(command, STRING_SIZE - 1, | |
149 | "/usr/sbin/ipsec down %s >/dev/null", name); | |
150 | safe_system(command); | |
151 | ||
152 | // Reload the IPsec firewall policy | |
153 | safe_system("/usr/lib/firewall/ipsec-policy >/dev/null"); | |
154 | ||
155 | // Create or destroy interfaces | |
156 | safe_system("/usr/local/bin/ipsec-interfaces >/dev/null"); | |
157 | } | |
158 | ||
159 | int main(int argc, char *argv[]) { | |
160 | struct keyvalue *kv = NULL; | |
161 | ||
162 | if (argc < 2) { | |
163 | usage(); | |
164 | exit(1); | |
165 | } | |
166 | if (!(initsetuid())) | |
167 | exit(1); | |
168 | ||
169 | FILE *file = NULL; | |
170 | ||
171 | if (strcmp(argv[1], "I") == 0) { | |
172 | safe_system("/usr/sbin/ipsec status"); | |
173 | exit(0); | |
174 | } | |
175 | ||
176 | if (strcmp(argv[1], "R") == 0) { | |
177 | ipsec_reload(); | |
178 | exit(0); | |
179 | } | |
180 | ||
181 | /* FIXME: workaround for pclose() issue - still no real idea why | |
182 | * this is happening */ | |
183 | signal(SIGCHLD, SIG_DFL); | |
184 | ||
185 | /* handle operations that doesn't need start the ipsec system */ | |
186 | if (argc == 2) { | |
187 | if (strcmp(argv[1], "D") == 0) { | |
188 | safe_system("/usr/sbin/ipsec stop >/dev/null 2>&1"); | |
189 | safe_system("/usr/lib/firewall/ipsec-policy >/dev/null"); | |
190 | safe_system("/usr/local/bin/ipsec-interfaces >/dev/null"); | |
191 | exit(0); | |
192 | } | |
193 | } | |
194 | ||
195 | /* read vpn config */ | |
196 | kv=initkeyvalues(); | |
197 | if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings")) | |
198 | { | |
199 | fprintf(stderr, "Cannot read vpn settings\n"); | |
200 | exit(1); | |
201 | } | |
202 | ||
203 | /* check is the vpn system is enabled */ | |
204 | { | |
205 | char s[STRING_SIZE]; | |
206 | findkey(kv, "ENABLED", s); | |
207 | freekeyvalues(kv); | |
208 | if (strcmp (s, "on") != 0) | |
209 | exit(0); | |
210 | } | |
211 | ||
212 | char s[STRING_SIZE]; | |
213 | ||
214 | // start the system | |
215 | if ((argc == 2) && strcmp(argv[1], "S") == 0) { | |
216 | safe_system("/usr/lib/firewall/ipsec-policy >/dev/null"); | |
217 | safe_system("/usr/local/bin/ipsec-interfaces >/dev/null"); | |
218 | safe_system("/usr/sbin/ipsec restart >/dev/null"); | |
219 | exit(0); | |
220 | } | |
221 | ||
222 | // it is a selective start or stop | |
223 | // second param is only a number 'key' | |
224 | if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) { | |
225 | fprintf(stderr, "Bad arg: %s\n", argv[2]); | |
226 | usage(); | |
227 | exit(1); | |
228 | } | |
229 | ||
230 | // search the vpn pointed by 'key' | |
231 | if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) { | |
232 | fprintf(stderr, "Couldn't open vpn settings file"); | |
233 | exit(1); | |
234 | } | |
235 | while (fgets(s, STRING_SIZE, file) != NULL) { | |
236 | char *key; | |
237 | char *name; | |
238 | char *type; | |
239 | if (!decode_line(s,&key,&name,&type)) | |
240 | continue; | |
241 | ||
242 | // is it the 'key' requested ? | |
243 | if (strcmp(argv[2], key) != 0) | |
244 | continue; | |
245 | ||
246 | // Start or Delete this Connection | |
247 | if (strcmp(argv[1], "S") == 0) | |
248 | turn_connection_on (name, type); | |
249 | else if (strcmp(argv[1], "D") == 0) | |
250 | turn_connection_off (name); | |
251 | else { | |
252 | fprintf(stderr, "Bad command\n"); | |
253 | exit(1); | |
254 | } | |
255 | } | |
256 | fclose(file); | |
257 | ||
258 | return 0; | |
259 | } |