added auth_method field
[strongswan.git] / src / starter / starterstroke.c
1 /* Stroke for charon is the counterpart to whack from pluto
2 * Copyright (C) 2006 Martin Willi - Hochschule fuer Technik Rapperswil
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * for more details.
13 *
14 * RCSID $Id: starterstroke.c $
15 */
16
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <sys/un.h>
20 #include <linux/stddef.h>
21 #include <unistd.h>
22 #include <stdlib.h>
23 #include <errno.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
26
27 #include <freeswan.h>
28
29 #include <constants.h>
30 #include <defs.h>
31 #include <log.h>
32
33 #include <stroke.h>
34
35 #include "starterstroke.h"
36 #include "confread.h"
37 #include "files.h"
38
39 /**
40 * AUTH Method to use.
41 *
42 * @ingroup config
43 */
44 enum auth_method_t {
45 /**
46 * Computed as specified in section 2.15 of RFC using
47 * an RSA private key over a PKCS#1 padded hash.
48 */
49 RSA_DIGITAL_SIGNATURE = 1,
50
51 /**
52 * Computed as specified in section 2.15 of RFC using the
53 * shared key associated with the identity in the ID payload
54 * and the negotiated prf function
55 */
56 SHARED_KEY_MESSAGE_INTEGRITY_CODE = 2,
57
58 /**
59 * Computed as specified in section 2.15 of RFC using a
60 * DSS private key over a SHA-1 hash.
61 */
62 DSS_DIGITAL_SIGNATURE = 3,
63 };
64
65 static char* push_string(stroke_msg_t *msg, char *string)
66 {
67 u_int string_start = msg->length;
68
69 if (string == NULL || msg->length + strlen(string) >= sizeof(stroke_msg_t))
70 {
71 return NULL;
72 }
73 else
74 {
75 msg->length += strlen(string) + 1;
76 strcpy((char*)msg + string_start, string);
77 return (char*)string_start;
78 }
79 }
80
81 static int send_stroke_msg (stroke_msg_t *msg)
82 {
83 struct sockaddr_un ctl_addr = { AF_UNIX, CHARON_CTL_FILE };
84 int byte_count;
85 char buffer[64];
86
87 int sock = socket(AF_UNIX, SOCK_STREAM, 0);
88
89 if (sock < 0)
90 {
91 plog("socket() failed: %s", strerror(errno));
92 return -1;
93 }
94 if (connect(sock, (struct sockaddr *)&ctl_addr, offsetof(struct sockaddr_un, sun_path) + strlen(ctl_addr.sun_path)) < 0)
95 {
96 plog("connect(charon_ctl) failed: %s", strerror(errno));
97 close(sock);
98 return -1;
99 }
100
101 /* send message */
102 if (write(sock, msg, msg->length) != msg->length)
103 {
104 plog("write(charon_ctl) failed: %s", strerror(errno));
105 close(sock);
106 return -1;
107 }
108 while ((byte_count = read(sock, buffer, sizeof(buffer)-1)) > 0)
109 {
110 buffer[byte_count] = '\0';
111 plog("%s", buffer);
112 }
113 if (byte_count < 0)
114 {
115 plog("read() failed: %s", strerror(errno));
116 }
117
118 close(sock);
119 return 0;
120 }
121
122 static char* connection_name(starter_conn_t *conn)
123 {
124 /* if connection name is '%auto', create a new name like conn_xxxxx */
125 static char buf[32];
126
127 if (streq(conn->name, "%auto"))
128 {
129 sprintf(buf, "conn_%ld", conn->id);
130 return buf;
131 }
132 return conn->name;
133 }
134
135 static void ip_address2string(ip_address *addr, char *buffer, size_t len)
136 {
137 switch (((struct sockaddr*)addr)->sa_family)
138 {
139 case AF_INET:
140 {
141 struct sockaddr_in* sin = (struct sockaddr_in*)addr;
142 if (inet_ntop(AF_INET, &sin->sin_addr, buffer, len))
143 {
144 return;
145 }
146 break;
147 }
148 case AF_INET6:
149 {
150 struct sockaddr_in6* sin6 = (struct sockaddr_in6*)addr;
151 if (inet_ntop(AF_INET6, &sin6->sin6_addr, buffer, len))
152 {
153 return;
154 }
155 break;
156 }
157 default:
158 break;
159 }
160 /* failed */
161 snprintf(buffer, len, "0.0.0.0");
162 }
163
164
165 static void starter_stroke_add_end(stroke_msg_t *msg, stroke_end_t *msg_end, starter_end_t *conn_end)
166 {
167 char buffer[INET6_ADDRSTRLEN];
168
169 msg_end->id = push_string(msg, conn_end->id);
170 msg_end->cert = push_string(msg, conn_end->cert);
171 msg_end->ca = push_string(msg, conn_end->ca);
172 msg_end->updown = push_string(msg, conn_end->updown);
173 ip_address2string(&conn_end->addr, buffer, sizeof(buffer));
174 msg_end->address = push_string(msg, buffer);
175 ip_address2string(&conn_end->subnet.addr, buffer, sizeof(buffer));
176 msg_end->subnet = push_string(msg, buffer);
177 msg_end->subnet_mask = conn_end->subnet.maskbits;
178 msg_end->sendcert = conn_end->sendcert;
179 msg_end->protocol = conn_end->protocol;
180 msg_end->port = conn_end->port;
181 }
182
183 int starter_stroke_add_conn(starter_conn_t *conn)
184 {
185 stroke_msg_t msg;
186
187 msg.type = STR_ADD_CONN;
188 msg.length = offsetof(stroke_msg_t, buffer);
189 msg.add_conn.ikev2 = conn->keyexchange == KEY_EXCHANGE_IKEV2;
190 msg.add_conn.name = push_string(&msg, connection_name(conn));
191 msg.add_conn.auth_method = (conn->policy & POLICY_PSK)?
192 SHARED_KEY_MESSAGE_INTEGRITY_CODE : RSA_DIGITAL_SIGNATURE;
193
194 if (conn->policy & POLICY_DONT_REKEY)
195 {
196 msg.add_conn.rekey.ipsec_lifetime = 0;
197 msg.add_conn.rekey.ike_lifetime = 0;
198 msg.add_conn.rekey.margin = 0;
199 msg.add_conn.rekey.tries = 0;
200 msg.add_conn.rekey.fuzz = 0;
201 }
202 else
203 {
204 msg.add_conn.rekey.ipsec_lifetime = conn->sa_ipsec_life_seconds;
205 msg.add_conn.rekey.ike_lifetime = conn->sa_ike_life_seconds;
206 msg.add_conn.rekey.margin = conn->sa_rekey_margin;
207 msg.add_conn.rekey.tries = conn->sa_keying_tries;
208 msg.add_conn.rekey.fuzz = conn->sa_rekey_fuzz;
209 }
210 msg.add_conn.algorithms.ike = push_string(&msg, conn->ike);
211 msg.add_conn.algorithms.esp = push_string(&msg, conn->esp);
212 msg.add_conn.dpd.delay = conn->dpd_delay;
213 msg.add_conn.dpd.action = conn->dpd_action;
214
215 starter_stroke_add_end(&msg, &msg.add_conn.me, &conn->right);
216 starter_stroke_add_end(&msg, &msg.add_conn.other, &conn->left);
217
218 return send_stroke_msg(&msg);
219 }
220
221 int starter_stroke_del_conn(starter_conn_t *conn)
222 {
223 stroke_msg_t msg;
224
225 msg.type = STR_DEL_CONN;
226 msg.length = offsetof(stroke_msg_t, buffer);
227 msg.del_conn.name = push_string(&msg, connection_name(conn));
228 return send_stroke_msg(&msg);
229 }
230
231 int starter_stroke_route_conn(starter_conn_t *conn)
232 {
233 stroke_msg_t msg;
234
235 msg.type = STR_ROUTE;
236 msg.length = offsetof(stroke_msg_t, buffer);
237 msg.route.name = push_string(&msg, connection_name(conn));
238 return send_stroke_msg(&msg);
239 }
240
241 int starter_stroke_initiate_conn(starter_conn_t *conn)
242 {
243 stroke_msg_t msg;
244
245 msg.type = STR_INITIATE;
246 msg.length = offsetof(stroke_msg_t, buffer);
247 msg.initiate.name = push_string(&msg, connection_name(conn));
248 return send_stroke_msg(&msg);
249 }