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2fb975da TT |
1 | /* strongSwan VICI protocol implementation for NHRP |
2 | * Copyright (c) 2014-2015 Timo Teräs | |
3 | * | |
4 | * This file is free software: you may copy, redistribute and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <string.h> | |
11 | #include <sys/socket.h> | |
12 | #include <sys/un.h> | |
13 | ||
14 | #include "thread.h" | |
15 | #include "zbuf.h" | |
16 | #include "log.h" | |
17 | #include "nhrpd.h" | |
18 | ||
19 | #include "vici.h" | |
20 | ||
21 | #define ERRNO_IO_RETRY(EN) (((EN) == EAGAIN) || ((EN) == EWOULDBLOCK) || ((EN) == EINTR)) | |
22 | ||
23 | struct blob { | |
24 | char *ptr; | |
25 | int len; | |
26 | }; | |
27 | ||
28 | static int blob_equal(const struct blob *b, const char *str) | |
29 | { | |
30 | if (b->len != (int) strlen(str)) return 0; | |
31 | return memcmp(b->ptr, str, b->len) == 0; | |
32 | } | |
33 | ||
34 | static int blob2buf(const struct blob *b, char *buf, size_t n) | |
35 | { | |
36 | if (b->len >= (int) n) return 0; | |
37 | memcpy(buf, b->ptr, b->len); | |
38 | buf[b->len] = 0; | |
39 | return 1; | |
40 | } | |
41 | ||
42 | struct vici_conn { | |
43 | struct thread *t_reconnect, *t_read, *t_write; | |
44 | struct zbuf ibuf; | |
45 | struct zbuf_queue obuf; | |
46 | int fd; | |
47 | uint8_t ibuf_data[VICI_MAX_MSGLEN]; | |
48 | }; | |
49 | ||
50 | struct vici_message_ctx { | |
51 | const char *sections[8]; | |
52 | int nsections; | |
53 | }; | |
54 | ||
55 | static int vici_reconnect(struct thread *t); | |
56 | static void vici_submit_request(struct vici_conn *vici, const char *name, ...); | |
57 | ||
58 | static void vici_zbuf_puts(struct zbuf *obuf, const char *str) | |
59 | { | |
60 | size_t len = strlen(str); | |
61 | zbuf_put8(obuf, len); | |
62 | zbuf_put(obuf, str, len); | |
63 | } | |
64 | ||
65 | static void vici_connection_error(struct vici_conn *vici) | |
66 | { | |
67 | nhrp_vc_reset(); | |
68 | ||
69 | THREAD_OFF(vici->t_read); | |
70 | THREAD_OFF(vici->t_write); | |
71 | zbuf_reset(&vici->ibuf); | |
72 | zbufq_reset(&vici->obuf); | |
73 | ||
74 | close(vici->fd); | |
75 | vici->fd = -1; | |
76 | THREAD_TIMER_ON(master, vici->t_reconnect, vici_reconnect, vici, 2); | |
77 | } | |
78 | ||
79 | static void vici_parse_message( | |
80 | struct vici_conn *vici, struct zbuf *msg, | |
81 | void (*parser)(struct vici_message_ctx *ctx, enum vici_type_t msgtype, const struct blob *key, const struct blob *val), | |
82 | struct vici_message_ctx *ctx) | |
83 | { | |
84 | uint8_t *type; | |
85 | struct blob key; | |
86 | struct blob val; | |
87 | ||
88 | while ((type = zbuf_may_pull(msg, uint8_t)) != NULL) { | |
89 | switch (*type) { | |
90 | case VICI_SECTION_START: | |
91 | key.len = zbuf_get8(msg); | |
92 | key.ptr = zbuf_pulln(msg, key.len); | |
93 | debugf(NHRP_DEBUG_VICI, "VICI: Section start '%.*s'", key.len, key.ptr); | |
94 | parser(ctx, *type, &key, NULL); | |
95 | ctx->nsections++; | |
96 | break; | |
97 | case VICI_SECTION_END: | |
98 | debugf(NHRP_DEBUG_VICI, "VICI: Section end"); | |
99 | parser(ctx, *type, NULL, NULL); | |
100 | ctx->nsections--; | |
101 | break; | |
102 | case VICI_KEY_VALUE: | |
103 | key.len = zbuf_get8(msg); | |
104 | key.ptr = zbuf_pulln(msg, key.len); | |
105 | val.len = zbuf_get_be16(msg); | |
106 | val.ptr = zbuf_pulln(msg, val.len); | |
107 | debugf(NHRP_DEBUG_VICI, "VICI: Key '%.*s'='%.*s'", key.len, key.ptr, val.len, val.ptr); | |
108 | parser(ctx, *type, &key, &val); | |
109 | break; | |
110 | case VICI_LIST_START: | |
111 | key.len = zbuf_get8(msg); | |
112 | key.ptr = zbuf_pulln(msg, key.len); | |
113 | debugf(NHRP_DEBUG_VICI, "VICI: List start '%.*s'", key.len, key.ptr); | |
114 | break; | |
115 | case VICI_LIST_ITEM: | |
116 | val.len = zbuf_get_be16(msg); | |
117 | val.ptr = zbuf_pulln(msg, val.len); | |
118 | debugf(NHRP_DEBUG_VICI, "VICI: List item: '%.*s'", val.len, val.ptr); | |
119 | parser(ctx, *type, &key, &val); | |
120 | break; | |
121 | case VICI_LIST_END: | |
122 | debugf(NHRP_DEBUG_VICI, "VICI: List end"); | |
123 | break; | |
124 | default: | |
125 | debugf(NHRP_DEBUG_VICI, "VICI: Unsupported message component type %d", *type); | |
126 | return; | |
127 | } | |
128 | } | |
129 | } | |
130 | ||
131 | struct handle_sa_ctx { | |
132 | struct vici_message_ctx msgctx; | |
133 | int event; | |
134 | int child_ok; | |
135 | int kill_ikesa; | |
136 | uint32_t child_uniqueid, ike_uniqueid; | |
137 | struct { | |
138 | union sockunion host; | |
139 | struct blob id, cert; | |
140 | } local, remote; | |
141 | }; | |
142 | ||
143 | static void parse_sa_message( | |
144 | struct vici_message_ctx *ctx, | |
145 | enum vici_type_t msgtype, | |
146 | const struct blob *key, const struct blob *val) | |
147 | { | |
148 | struct handle_sa_ctx *sactx = container_of(ctx, struct handle_sa_ctx, msgctx); | |
149 | struct nhrp_vc *vc; | |
150 | char buf[512]; | |
151 | ||
152 | switch (msgtype) { | |
153 | case VICI_SECTION_START: | |
154 | if (ctx->nsections == 3) { | |
155 | /* Begin of child-sa section, reset child vars */ | |
156 | sactx->child_uniqueid = 0; | |
157 | sactx->child_ok = 0; | |
158 | } | |
159 | break; | |
160 | case VICI_SECTION_END: | |
161 | if (ctx->nsections == 3) { | |
162 | /* End of child-sa section, update nhrp_vc */ | |
163 | int up = sactx->child_ok || sactx->event == 1; | |
164 | if (up) { | |
165 | vc = nhrp_vc_get(&sactx->local.host, &sactx->remote.host, up); | |
166 | if (vc) { | |
167 | blob2buf(&sactx->local.id, vc->local.id, sizeof(vc->local.id)); | |
168 | if (blob2buf(&sactx->local.cert, (char*)vc->local.cert, sizeof(vc->local.cert))) | |
169 | vc->local.certlen = sactx->local.cert.len; | |
170 | blob2buf(&sactx->remote.id, vc->remote.id, sizeof(vc->remote.id)); | |
171 | if (blob2buf(&sactx->remote.cert, (char*)vc->remote.cert, sizeof(vc->remote.cert))) | |
172 | vc->remote.certlen = sactx->remote.cert.len; | |
173 | sactx->kill_ikesa |= nhrp_vc_ipsec_updown(sactx->child_uniqueid, vc); | |
174 | } | |
175 | } else { | |
176 | nhrp_vc_ipsec_updown(sactx->child_uniqueid, 0); | |
177 | } | |
178 | } | |
179 | break; | |
180 | default: | |
181 | switch (key->ptr[0]) { | |
182 | case 'l': | |
183 | if (blob_equal(key, "local-host") && ctx->nsections == 1) { | |
184 | if (blob2buf(val, buf, sizeof(buf))) | |
185 | str2sockunion(buf, &sactx->local.host); | |
186 | } else if (blob_equal(key, "local-id") && ctx->nsections == 1) { | |
187 | sactx->local.id = *val; | |
188 | } else if (blob_equal(key, "local-cert-data") && ctx->nsections == 1) { | |
189 | sactx->local.cert = *val; | |
190 | } | |
191 | break; | |
192 | case 'r': | |
193 | if (blob_equal(key, "remote-host") && ctx->nsections == 1) { | |
194 | if (blob2buf(val, buf, sizeof(buf))) | |
195 | str2sockunion(buf, &sactx->remote.host); | |
196 | } else if (blob_equal(key, "remote-id") && ctx->nsections == 1) { | |
197 | sactx->remote.id = *val; | |
198 | } else if (blob_equal(key, "remote-cert-data") && ctx->nsections == 1) { | |
199 | sactx->remote.cert = *val; | |
200 | } | |
201 | break; | |
202 | case 'u': | |
203 | if (blob_equal(key, "uniqueid") && blob2buf(val, buf, sizeof(buf))) { | |
204 | if (ctx->nsections == 3) | |
205 | sactx->child_uniqueid = strtoul(buf, NULL, 0); | |
206 | else if (ctx->nsections == 1) | |
207 | sactx->ike_uniqueid = strtoul(buf, NULL, 0); | |
208 | } | |
209 | break; | |
210 | case 's': | |
211 | if (blob_equal(key, "state") && ctx->nsections == 3) { | |
212 | sactx->child_ok = | |
213 | (sactx->event == 0 && | |
214 | (blob_equal(val, "INSTALLED") || | |
215 | blob_equal(val, "REKEYED"))); | |
216 | } | |
217 | break; | |
218 | } | |
219 | break; | |
220 | } | |
221 | } | |
222 | ||
223 | static void vici_recv_sa(struct vici_conn *vici, struct zbuf *msg, int event) | |
224 | { | |
225 | char buf[32]; | |
226 | struct handle_sa_ctx ctx = { | |
227 | .event = event, | |
228 | }; | |
229 | ||
230 | vici_parse_message(vici, msg, parse_sa_message, &ctx.msgctx); | |
231 | ||
232 | if (ctx.kill_ikesa && ctx.ike_uniqueid) { | |
233 | debugf(NHRP_DEBUG_COMMON, "VICI: Deleting IKE_SA %u", ctx.ike_uniqueid); | |
234 | snprintf(buf, sizeof buf, "%u", ctx.ike_uniqueid); | |
235 | vici_submit_request( | |
236 | vici, "terminate", | |
237 | VICI_KEY_VALUE, "ike-id", strlen(buf), buf, | |
238 | VICI_END); | |
239 | } | |
240 | } | |
241 | ||
242 | static void vici_recv_message(struct vici_conn *vici, struct zbuf *msg) | |
243 | { | |
244 | uint32_t msglen; | |
245 | uint8_t msgtype; | |
246 | struct blob name; | |
247 | ||
248 | msglen = zbuf_get_be32(msg); | |
249 | msgtype = zbuf_get8(msg); | |
250 | debugf(NHRP_DEBUG_VICI, "VICI: Message %d, %d bytes", msgtype, msglen); | |
251 | ||
252 | switch (msgtype) { | |
253 | case VICI_EVENT: | |
254 | name.len = zbuf_get8(msg); | |
255 | name.ptr = zbuf_pulln(msg, name.len); | |
256 | ||
257 | debugf(NHRP_DEBUG_VICI, "VICI: Event '%.*s'", name.len, name.ptr); | |
258 | if (blob_equal(&name, "list-sa") || | |
259 | blob_equal(&name, "child-updown") || | |
260 | blob_equal(&name, "child-rekey")) | |
261 | vici_recv_sa(vici, msg, 0); | |
262 | else if (blob_equal(&name, "child-state-installed") || | |
263 | blob_equal(&name, "child-state-rekeyed")) | |
264 | vici_recv_sa(vici, msg, 1); | |
265 | else if (blob_equal(&name, "child-state-destroying")) | |
266 | vici_recv_sa(vici, msg, 2); | |
267 | break; | |
268 | case VICI_EVENT_UNKNOWN: | |
269 | zlog_err("VICI: StrongSwan does not support mandatory events (unpatched?)"); | |
270 | break; | |
271 | case VICI_EVENT_CONFIRM: | |
272 | case VICI_CMD_RESPONSE: | |
273 | break; | |
274 | default: | |
275 | zlog_notice("VICI: Unrecognized message type %d", msgtype); | |
276 | break; | |
277 | } | |
278 | } | |
279 | ||
280 | static int vici_read(struct thread *t) | |
281 | { | |
282 | struct vici_conn *vici = THREAD_ARG(t); | |
283 | struct zbuf *ibuf = &vici->ibuf; | |
284 | struct zbuf pktbuf; | |
285 | ||
286 | vici->t_read = NULL; | |
287 | if (zbuf_read(ibuf, vici->fd, (size_t) -1) < 0) { | |
288 | vici_connection_error(vici); | |
289 | return 0; | |
290 | } | |
291 | ||
292 | /* Process all messages in buffer */ | |
293 | do { | |
294 | uint32_t *hdrlen = zbuf_may_pull(ibuf, uint32_t); | |
295 | if (!hdrlen) | |
296 | break; | |
297 | if (!zbuf_may_pulln(ibuf, ntohl(*hdrlen))) { | |
298 | zbuf_reset_head(ibuf, hdrlen); | |
299 | break; | |
300 | } | |
301 | ||
302 | /* Handle packet */ | |
303 | zbuf_init(&pktbuf, hdrlen, htonl(*hdrlen)+4, htonl(*hdrlen)+4); | |
304 | vici_recv_message(vici, &pktbuf); | |
305 | } while (1); | |
306 | ||
307 | THREAD_READ_ON(master, vici->t_read, vici_read, vici, vici->fd); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static int vici_write(struct thread *t) | |
312 | { | |
313 | struct vici_conn *vici = THREAD_ARG(t); | |
314 | int r; | |
315 | ||
316 | vici->t_write = NULL; | |
317 | r = zbufq_write(&vici->obuf, vici->fd); | |
318 | if (r > 0) { | |
319 | THREAD_WRITE_ON(master, vici->t_write, vici_write, vici, vici->fd); | |
320 | } else if (r < 0) { | |
321 | vici_connection_error(vici); | |
322 | } | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static void vici_submit(struct vici_conn *vici, struct zbuf *obuf) | |
328 | { | |
329 | if (vici->fd < 0) { | |
330 | zbuf_free(obuf); | |
331 | return; | |
332 | } | |
333 | ||
334 | zbufq_queue(&vici->obuf, obuf); | |
335 | THREAD_WRITE_ON(master, vici->t_write, vici_write, vici, vici->fd); | |
336 | } | |
337 | ||
338 | static void vici_submit_request(struct vici_conn *vici, const char *name, ...) | |
339 | { | |
340 | struct zbuf *obuf; | |
341 | uint32_t *hdrlen; | |
342 | va_list va; | |
343 | size_t len; | |
344 | int type; | |
345 | ||
346 | obuf = zbuf_alloc(256); | |
347 | if (!obuf) return; | |
348 | ||
349 | hdrlen = zbuf_push(obuf, uint32_t); | |
350 | zbuf_put8(obuf, VICI_CMD_REQUEST); | |
351 | vici_zbuf_puts(obuf, name); | |
352 | ||
353 | va_start(va, name); | |
354 | for (type = va_arg(va, int); type != VICI_END; type = va_arg(va, int)) { | |
355 | zbuf_put8(obuf, type); | |
356 | switch (type) { | |
357 | case VICI_KEY_VALUE: | |
358 | vici_zbuf_puts(obuf, va_arg(va, const char *)); | |
359 | len = va_arg(va, size_t); | |
360 | zbuf_put_be16(obuf, len); | |
361 | zbuf_put(obuf, va_arg(va, void *), len); | |
362 | break; | |
363 | case VICI_END: | |
364 | break; | |
365 | default: | |
366 | break; | |
367 | } | |
368 | } | |
369 | va_end(va); | |
370 | *hdrlen = htonl(zbuf_used(obuf) - 4); | |
371 | vici_submit(vici, obuf); | |
372 | } | |
373 | ||
374 | static void vici_register_event(struct vici_conn *vici, const char *name) | |
375 | { | |
376 | struct zbuf *obuf; | |
377 | uint32_t *hdrlen; | |
378 | uint8_t namelen; | |
379 | ||
380 | namelen = strlen(name); | |
381 | obuf = zbuf_alloc(4 + 1 + 1 + namelen); | |
382 | if (!obuf) return; | |
383 | ||
384 | hdrlen = zbuf_push(obuf, uint32_t); | |
385 | zbuf_put8(obuf, VICI_EVENT_REGISTER); | |
386 | zbuf_put8(obuf, namelen); | |
387 | zbuf_put(obuf, name, namelen); | |
388 | *hdrlen = htonl(zbuf_used(obuf) - 4); | |
389 | ||
390 | vici_submit(vici, obuf); | |
391 | } | |
392 | ||
393 | static int vici_reconnect(struct thread *t) | |
394 | { | |
395 | struct vici_conn *vici = THREAD_ARG(t); | |
396 | int fd; | |
397 | ||
398 | vici->t_reconnect = NULL; | |
399 | if (vici->fd >= 0) return 0; | |
400 | ||
401 | fd = sock_open_unix("/var/run/charon.vici"); | |
402 | if (fd < 0) { | |
403 | zlog_warn("%s: failure connecting VICI socket: %s", | |
404 | __PRETTY_FUNCTION__, strerror(errno)); | |
405 | THREAD_TIMER_ON(master, vici->t_reconnect, vici_reconnect, vici, 2); | |
406 | return 0; | |
407 | } | |
408 | ||
409 | debugf(NHRP_DEBUG_COMMON, "VICI: Connected"); | |
410 | vici->fd = fd; | |
411 | THREAD_READ_ON(master, vici->t_read, vici_read, vici, vici->fd); | |
412 | ||
413 | /* Send event subscribtions */ | |
414 | //vici_register_event(vici, "child-updown"); | |
415 | //vici_register_event(vici, "child-rekey"); | |
416 | vici_register_event(vici, "child-state-installed"); | |
417 | vici_register_event(vici, "child-state-rekeyed"); | |
418 | vici_register_event(vici, "child-state-destroying"); | |
419 | vici_register_event(vici, "list-sa"); | |
420 | vici_submit_request(vici, "list-sas", VICI_END); | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | static struct vici_conn vici_connection; | |
426 | ||
427 | void vici_init(void) | |
428 | { | |
429 | struct vici_conn *vici = &vici_connection; | |
430 | ||
431 | vici->fd = -1; | |
432 | zbuf_init(&vici->ibuf, vici->ibuf_data, sizeof(vici->ibuf_data), 0); | |
433 | zbufq_init(&vici->obuf); | |
434 | THREAD_TIMER_MSEC_ON(master, vici->t_reconnect, vici_reconnect, vici, 10); | |
435 | } | |
436 | ||
437 | void vici_terminate(void) | |
438 | { | |
439 | } | |
440 | ||
441 | void vici_request_vc(const char *profile, union sockunion *src, union sockunion *dst, int prio) | |
442 | { | |
443 | struct vici_conn *vici = &vici_connection; | |
444 | char buf[2][SU_ADDRSTRLEN]; | |
445 | ||
446 | sockunion2str(src, buf[0], sizeof buf[0]); | |
447 | sockunion2str(dst, buf[1], sizeof buf[1]); | |
448 | ||
449 | vici_submit_request( | |
450 | vici, "initiate", | |
451 | VICI_KEY_VALUE, "child", strlen(profile), profile, | |
3d3813b2 TT |
452 | VICI_KEY_VALUE, "timeout", (size_t) 2, "-1", |
453 | VICI_KEY_VALUE, "async", (size_t) 1, "1", | |
454 | VICI_KEY_VALUE, "init-limits", (size_t) 1, prio ? "0" : "1", | |
2fb975da TT |
455 | VICI_KEY_VALUE, "my-host", strlen(buf[0]), buf[0], |
456 | VICI_KEY_VALUE, "other-host", strlen(buf[1]), buf[1], | |
457 | VICI_END); | |
458 | } | |
459 | ||
460 | int sock_open_unix(const char *path) | |
461 | { | |
462 | int ret, fd; | |
463 | struct sockaddr_un addr; | |
464 | ||
465 | fd = socket(AF_UNIX, SOCK_STREAM, 0); | |
466 | if (fd < 0) | |
467 | return -1; | |
468 | ||
469 | memset(&addr, 0, sizeof (struct sockaddr_un)); | |
470 | addr.sun_family = AF_UNIX; | |
471 | strncpy(addr.sun_path, path, strlen (path)); | |
472 | ||
473 | ret = connect(fd, (struct sockaddr *) &addr, sizeof(addr.sun_family) + strlen(addr.sun_path)); | |
474 | if (ret < 0) { | |
475 | close(fd); | |
476 | return -1; | |
477 | } | |
478 | ||
479 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK); | |
480 | ||
481 | return fd; | |
482 | } |