aboutsummaryrefslogtreecommitdiff
path: root/setup.c
blob: b56c503078f8ed9f0dff6d22700896234f5c9efb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netdb.h>

#include "config.h"
#include "libpfkey.h"
#include "var.h"
#include "isakmp_var.h"
#include "isakmp.h"
#include "vmbuf.h"
#include "oakley.h"
#include "ipsec_doi.h"
#include "algorithm.h"
#include "vendorid.h"
#include "proposal.h"
#include "sainfo.h"
#include "localconf.h"
#include "remoteconf.h"
#include "sockmisc.h"
#include "grabmyaddr.h"
#include "plog.h"
#include "admin.h"
#include "privsep.h"

static struct myaddrs myaddrs[2];
static struct etypes main_mode = { .type = ISAKMP_ETYPE_IDENT };
static struct localconf localconf;
static struct remoteconf remoteconf;
static struct sainfo sainfo;
static char *pre_shared_key;

struct localconf *lcconf = &localconf;
char *script_names[SCRIPT_MAX + 1];

static void set_default()
{
    localconf.myaddrs = &myaddrs[0];
    localconf.port_isakmp = PORT_ISAKMP;
    localconf.port_isakmp_natt = PORT_ISAKMP_NATT;
    localconf.default_af = AF_INET;
    localconf.pad_random = LC_DEFAULT_PAD_RANDOM;
    localconf.pad_randomlen = LC_DEFAULT_PAD_RANDOM;
    localconf.pad_strict = LC_DEFAULT_PAD_STRICT;
    localconf.pad_excltail = LC_DEFAULT_PAD_EXCLTAIL;
    localconf.retry_counter = 10;
    localconf.retry_interval = 3;
    localconf.count_persend = LC_DEFAULT_COUNT_PERSEND;
    localconf.secret_size = LC_DEFAULT_SECRETSIZE;
    localconf.retry_checkph1 = LC_DEFAULT_RETRY_CHECKPH1;
    localconf.wait_ph2complete = LC_DEFAULT_WAIT_PH2COMPLETE;
    localconf.natt_ka_interval = LC_DEFAULT_NATT_KA_INTERVAL;
    localconf.pathinfo[LC_PATHTYPE_CERT] = "/";

    remoteconf.etypes = &main_mode;
    remoteconf.doitype = IPSEC_DOI;
    remoteconf.sittype = IPSECDOI_SIT_IDENTITY_ONLY;
    remoteconf.idvtype = IDTYPE_ADDRESS;
    remoteconf.nonce_size = DEFAULT_NONCE_SIZE;

    remoteconf.ike_frag = TRUE;
    remoteconf.esp_frag = IP_MAXPACKET;
    remoteconf.ini_contact = TRUE;
    remoteconf.pcheck_level = PROP_CHECK_OBEY;
    remoteconf.verify_identifier = FALSE;
    remoteconf.verify_cert = TRUE;
    remoteconf.getcert_method = ISAKMP_GETCERT_PAYLOAD;
    remoteconf.certtype = ISAKMP_CERT_X509SIGN;
    remoteconf.getcacert_method = ISAKMP_GETCERT_LOCALFILE;
    remoteconf.cacerttype = ISAKMP_CERT_X509SIGN;
    remoteconf.send_cert = TRUE;
    remoteconf.send_cr = TRUE;
    remoteconf.gen_policy = TRUE;
    remoteconf.retry_counter = LC_DEFAULT_RETRY_COUNTER;
    remoteconf.retry_interval = LC_DEFAULT_RETRY_INTERVAL;
    remoteconf.nat_traversal = TRUE;
    remoteconf.rsa_private = genlist_init();
    remoteconf.rsa_public = genlist_init();
    remoteconf.dpd = TRUE;
    remoteconf.dpd_interval = 0;
    remoteconf.dpd_retry = 5;
    remoteconf.dpd_maxfails = 5;

    sainfo.lifetime = IPSECDOI_ATTR_SA_LD_SEC_DEFAULT;
    sainfo.lifebyte = IPSECDOI_ATTR_SA_LD_KB_MAX;
}

static void set_address(char *server, char *port)
{
    struct addrinfo hints = {
        .ai_flags = AI_NUMERICSERV,
#ifndef INET6
        .ai_family = AF_INET,
#else
        .ai_family = AF_UNSPEC,
#endif
        .ai_socktype = SOCK_DGRAM,
    };
    struct addrinfo *r;

    if (getaddrinfo(server, port, &hints, &r) != 0) {
        do_plog(LLV_ERROR, "Cannot resolve server address\n");
        exit(1);
    }
    if (r->ai_next) {
        do_plog(LLV_WARNING, "Multiple server address found\n");
    }
    remoteconf.remote = dupsaddr(r->ai_addr);
    freeaddrinfo(r);

    myaddrs[0].addr = getlocaladdr(remoteconf.remote);
    if (!myaddrs[0].addr) {
        do_plog(LLV_ERROR, "Cannot get local address\n");
        exit(1);
    }
}

static void add_proposal(int auth, int hash, int encryption, int length)
{
    struct isakmpsa *p = calloc(1, sizeof(struct isakmpsa));
    p->prop_no = 1;
    p->lifetime = OAKLEY_ATTR_SA_LD_SEC_DEFAULT;
    p->enctype = encryption;
    p->encklen = length;
    p->authmethod = auth;
    p->hashtype = hash;
    p->dh_group = OAKLEY_ATTR_GRP_DESC_MODP1024;
    p->vendorid = VENDORID_UNKNOWN;
    p->rmconf = &remoteconf;

    if (!remoteconf.proposal) {
      p->trns_no = 1;
      remoteconf.proposal = p;
    } else {
        struct isakmpsa *q = remoteconf.proposal;
        while (q->next) {
            q = q->next;
        }
        p->trns_no = q->trns_no + 1;
        q->next = p;
    }
}

static void add_sainfo_algorithm(int class, int algorithm, int length)
{
    struct sainfoalg *p = calloc(1, sizeof(struct sainfoalg));
    p->alg = algorithm;
    p->encklen = length;

    if (!sainfo.algs[class]) {
        sainfo.algs[class] = p;
    } else {
        struct sainfoalg *q = sainfo.algs[class];
        while (q->next) {
            q = q->next;
        }
        q->next = p;
    }
}

/* flush; spdflush; */
static void flush()
{
    int key = pfkey_open();
    if (key != -1) {
        pfkey_send_flush(key, SADB_SATYPE_UNSPEC);
        pfkey_send_spdflush(key);
        pfkey_close(key);
    }
}

/* flush; spdflush;
 * spdadd local remote udp -P out ipsec esp/transport//require; */
static void spdadd(struct sockaddr *local, struct sockaddr *remote)
{
    struct __attribute__((packed)) {
        struct sadb_x_policy p;
        struct sadb_x_ipsecrequest q;
    } policy;
    int mask = (local->sa_family == AF_INET) ? sizeof(struct in_addr) * 8 :
               sizeof(struct in6_addr) * 8;
    int key = pfkey_open();
    if (key == -1) {
        do_plog(LLV_ERROR, "Cannot create KEY socket\n");
        exit(1);
    }

    memset(&policy, 0, sizeof(policy));
    policy.p.sadb_x_policy_len = PFKEY_UNIT64(sizeof(policy));
    policy.p.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
    policy.p.sadb_x_policy_type = IPSEC_POLICY_IPSEC;
    policy.p.sadb_x_policy_dir = IPSEC_DIR_OUTBOUND;
#ifdef HAVE_PFKEY_POLICY_PRIORITY
    policy.p.sadb_x_policy_priority = PRIORITY_DEFAULT;
#endif
    policy.q.sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest);
    policy.q.sadb_x_ipsecrequest_proto = IPPROTO_ESP;
    policy.q.sadb_x_ipsecrequest_mode = IPSEC_MODE_TRANSPORT;
    policy.q.sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;

    if (pfkey_send_flush(key, SADB_SATYPE_UNSPEC) <= 0 ||
        pfkey_send_spdflush(key) <= 0 ||
        pfkey_send_spdadd(key, local, mask, remote, mask, IPPROTO_UDP,
                          (caddr_t)&policy, sizeof(policy), 0) <= 0) {
        do_plog(LLV_ERROR, "Cannot initialize SA and SPD\n");
        exit(1);
    }
    pfkey_close(key);
    atexit(flush);
}

void setup(int argc, char **argv)
{
    int auth;
    if (argc != 4 && argc != 6) {
        printf("Usage: %s server port pre-shared-key\n"
               "       %s server port my-private-key my-cert ca-cert\n",
               argv[0], argv[0]);
        exit(0);
    }
    set_default();

    /* Set local address and remote address. */
    set_address(argv[1], argv[2]);

    /* Initialize SA and SPD. */
    spdadd(myaddrs[0].addr, remoteconf.remote);

    /* Set local port and remote port. */
    set_port(myaddrs[0].addr, localconf.port_isakmp);
    set_port(remoteconf.remote, localconf.port_isakmp);
#ifdef ENABLE_NATT
    myaddrs[0].next = &myaddrs[1];
    myaddrs[1].addr = dupsaddr(myaddrs[0].addr);
    set_port(myaddrs[1].addr, localconf.port_isakmp_natt);
    myaddrs[1].udp_encap = 1;
#endif

    /* Set authentication method. */
    if (argc == 4) {
        pre_shared_key = argv[3];
        auth = OAKLEY_ATTR_AUTH_METHOD_PSKEY;
    } else {
        remoteconf.idvtype = IDTYPE_ASN1DN;
        remoteconf.myprivfile = argv[3];
        remoteconf.mycertfile = argv[4];
        remoteconf.cacertfile = argv[5];
        auth = OAKLEY_ATTR_AUTH_METHOD_RSASIG;
    }

    /* Create proposals. */
    add_proposal(auth, OAKLEY_ATTR_HASH_ALG_SHA, OAKLEY_ATTR_ENC_ALG_3DES, 0);
    add_proposal(auth, OAKLEY_ATTR_HASH_ALG_MD5, OAKLEY_ATTR_ENC_ALG_3DES, 0);
    add_proposal(auth, OAKLEY_ATTR_HASH_ALG_SHA, OAKLEY_ATTR_ENC_ALG_DES, 0);
    add_proposal(auth, OAKLEY_ATTR_HASH_ALG_MD5, OAKLEY_ATTR_ENC_ALG_DES, 0);
    add_proposal(auth, OAKLEY_ATTR_HASH_ALG_SHA, OAKLEY_ATTR_ENC_ALG_AES, 128);
    add_proposal(auth, OAKLEY_ATTR_HASH_ALG_MD5, OAKLEY_ATTR_ENC_ALG_AES, 128);

    /* Create sainfo algorithms. */
    add_sainfo_algorithm(algclass_ipsec_auth, IPSECDOI_ATTR_AUTH_HMAC_SHA1, 0);
    add_sainfo_algorithm(algclass_ipsec_auth, IPSECDOI_ATTR_AUTH_HMAC_MD5, 0);
    add_sainfo_algorithm(algclass_ipsec_enc, IPSECDOI_ESP_3DES, 0);
    add_sainfo_algorithm(algclass_ipsec_enc, IPSECDOI_ESP_DES, 0);
    add_sainfo_algorithm(algclass_ipsec_enc, IPSECDOI_ESP_AES, 128);
}

/* localconf.h */

vchar_t *getpskbyaddr(struct sockaddr *addr)
{
    return privsep_getpsk(pre_shared_key, strlen(pre_shared_key));
}

vchar_t *getpskbyname(vchar_t *name)
{
    return NULL;
}

void getpathname(char *path, int length, int type, const char *name)
{
    strncpy(path, name, length);
}

/* remoteconf.h */

struct remoteconf *getrmconf(struct sockaddr *addr)
{
    return cmpsaddrwop(addr, remoteconf.remote) ? NULL : &remoteconf;
}

struct isakmpsa *dupisakmpsa(struct isakmpsa *sa)
{
    struct isakmpsa *p = NULL;
    if (sa && (p = malloc(sizeof(struct isakmpsa)))) {
        *p = *sa;
        p->next = NULL;
        if (sa->dhgrp) {
            oakley_setdhgroup(sa->dh_group, &p->dhgrp);
        }
    }
    return p;
}

void delisakmpsa(struct isakmpsa *sa)
{
    while (sa) {
        struct isakmpsa *p = sa->next;
        if (sa->dhgrp) {
            oakley_dhgrp_free(sa->dhgrp);
        }
        free(sa);
        sa = p;
    }
}

struct etypes *check_etypeok(struct remoteconf *rmconf, uint8_t etype)
{
    struct etypes *p = rmconf->etypes;
    while (p && etype != p->type) {
        p = p->next;
    }
    return p;
}

struct remoteconf *foreachrmconf(rmconf_func_t function, void *data)
{
    return (*function)(&remoteconf, data);
}

/* sainfo.h */

struct sainfo *getsainfo(const vchar_t *src, const vchar_t *dst,
                         const vchar_t *peer, int remoteid)
{
    return &sainfo;
}

const char *sainfo2str(const struct sainfo *si)
{
    return "*";
}