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d506b89c | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e5719363 | 2 | /*** |
96b2fb93 | 3 | Copyright © 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. |
e5719363 JT |
4 | ***/ |
5 | ||
6 | #include <sys/ioctl.h> | |
7 | #include <net/if.h> | |
8 | ||
8173d1d0 YW |
9 | #include "sd-resolve.h" |
10 | ||
e5719363 | 11 | #include "alloc-util.h" |
85c987a8 | 12 | #include "event-util.h" |
e5719363 | 13 | #include "fd-util.h" |
76df7779 | 14 | #include "fileio.h" |
e5719363 | 15 | #include "hexdecoct.h" |
43409486 | 16 | #include "netlink-util.h" |
e5719363 | 17 | #include "networkd-link.h" |
e5719363 | 18 | #include "networkd-manager.h" |
a4c9ae40 YW |
19 | #include "networkd-util.h" |
20 | #include "parse-util.h" | |
76df7779 | 21 | #include "path-util.h" |
1061dab1 | 22 | #include "resolve-private.h" |
a4c9ae40 YW |
23 | #include "string-util.h" |
24 | #include "strv.h" | |
25 | #include "wireguard.h" | |
e5719363 JT |
26 | #include "wireguard-netlink.h" |
27 | ||
28 | static void resolve_endpoints(NetDev *netdev); | |
29 | ||
f1368a33 YW |
30 | static void wireguard_peer_free(WireguardPeer *peer) { |
31 | WireguardIPmask *mask; | |
32 | ||
33 | if (!peer) | |
34 | return; | |
35 | ||
36 | if (peer->wireguard) { | |
37 | LIST_REMOVE(peers, peer->wireguard->peers, peer); | |
38 | ||
39 | set_remove(peer->wireguard->peers_with_unresolved_endpoint, peer); | |
40 | set_remove(peer->wireguard->peers_with_failed_endpoint, peer); | |
41 | ||
42 | if (peer->section) | |
43 | hashmap_remove(peer->wireguard->peers_by_section, peer->section); | |
44 | } | |
45 | ||
46 | network_config_section_free(peer->section); | |
47 | ||
48 | while ((mask = peer->ipmasks)) { | |
49 | LIST_REMOVE(ipmasks, peer->ipmasks, mask); | |
50 | free(mask); | |
51 | } | |
52 | ||
53 | free(peer->endpoint_host); | |
54 | free(peer->endpoint_port); | |
55 | ||
56 | free(peer); | |
57 | } | |
58 | ||
59 | DEFINE_NETWORK_SECTION_FUNCTIONS(WireguardPeer, wireguard_peer_free); | |
60 | ||
61 | static int wireguard_peer_new_static(Wireguard *w, const char *filename, unsigned section_line, WireguardPeer **ret) { | |
62 | _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL; | |
63 | _cleanup_(wireguard_peer_freep) WireguardPeer *peer = NULL; | |
64 | int r; | |
e5719363 JT |
65 | |
66 | assert(w); | |
f1368a33 YW |
67 | assert(ret); |
68 | assert(filename); | |
69 | assert(section_line > 0); | |
e5719363 | 70 | |
f1368a33 YW |
71 | r = network_config_section_new(filename, section_line, &n); |
72 | if (r < 0) | |
73 | return r; | |
74 | ||
75 | peer = hashmap_get(w->peers_by_section, n); | |
76 | if (peer) { | |
77 | *ret = TAKE_PTR(peer); | |
78 | return 0; | |
79 | } | |
e5719363 | 80 | |
fc721553 | 81 | peer = new(WireguardPeer, 1); |
e5719363 | 82 | if (!peer) |
f1368a33 | 83 | return -ENOMEM; |
fc721553 YW |
84 | |
85 | *peer = (WireguardPeer) { | |
86 | .flags = WGPEER_F_REPLACE_ALLOWEDIPS, | |
f1368a33 YW |
87 | .wireguard = w, |
88 | .section = TAKE_PTR(n), | |
fc721553 | 89 | }; |
e5719363 JT |
90 | |
91 | LIST_PREPEND(peers, w->peers, peer); | |
e5719363 | 92 | |
f1368a33 YW |
93 | r = hashmap_ensure_allocated(&w->peers_by_section, &network_config_hash_ops); |
94 | if (r < 0) | |
95 | return r; | |
96 | ||
97 | r = hashmap_put(w->peers_by_section, peer->section, peer); | |
98 | if (r < 0) | |
99 | return r; | |
100 | ||
101 | *ret = TAKE_PTR(peer); | |
102 | return 0; | |
e5719363 JT |
103 | } |
104 | ||
e1f717d4 | 105 | static int wireguard_set_ipmask_one(NetDev *netdev, sd_netlink_message *message, const WireguardIPmask *mask, uint16_t index) { |
e5719363 | 106 | int r; |
e1f717d4 YW |
107 | |
108 | assert(message); | |
109 | assert(mask); | |
110 | assert(index > 0); | |
111 | ||
112 | /* This returns 1 on success, 0 on recoverable error, and negative errno on failure. */ | |
113 | ||
114 | r = sd_netlink_message_open_array(message, index); | |
115 | if (r < 0) | |
116 | return 0; | |
117 | ||
118 | r = sd_netlink_message_append_u16(message, WGALLOWEDIP_A_FAMILY, mask->family); | |
119 | if (r < 0) | |
120 | goto cancel; | |
121 | ||
43409486 | 122 | r = netlink_message_append_in_addr_union(message, WGALLOWEDIP_A_IPADDR, mask->family, &mask->ip); |
e1f717d4 YW |
123 | if (r < 0) |
124 | goto cancel; | |
125 | ||
126 | r = sd_netlink_message_append_u8(message, WGALLOWEDIP_A_CIDR_MASK, mask->cidr); | |
127 | if (r < 0) | |
128 | goto cancel; | |
129 | ||
130 | r = sd_netlink_message_close_container(message); | |
131 | if (r < 0) | |
132 | return log_netdev_error_errno(netdev, r, "Could not add wireguard allowed ip: %m"); | |
133 | ||
134 | return 1; | |
135 | ||
136 | cancel: | |
137 | r = sd_netlink_message_cancel_array(message); | |
138 | if (r < 0) | |
139 | return log_netdev_error_errno(netdev, r, "Could not cancel wireguard allowed ip message attribute: %m"); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static int wireguard_set_peer_one(NetDev *netdev, sd_netlink_message *message, const WireguardPeer *peer, uint16_t index, WireguardIPmask **mask_start) { | |
145 | WireguardIPmask *mask, *start; | |
146 | uint16_t j = 0; | |
147 | int r; | |
148 | ||
149 | assert(message); | |
150 | assert(peer); | |
151 | assert(index > 0); | |
152 | assert(mask_start); | |
153 | ||
154 | /* This returns 1 on success, 0 on recoverable error, and negative errno on failure. */ | |
155 | ||
156 | start = *mask_start ?: peer->ipmasks; | |
157 | ||
158 | r = sd_netlink_message_open_array(message, index); | |
159 | if (r < 0) | |
160 | return 0; | |
161 | ||
162 | r = sd_netlink_message_append_data(message, WGPEER_A_PUBLIC_KEY, &peer->public_key, sizeof(peer->public_key)); | |
163 | if (r < 0) | |
164 | goto cancel; | |
165 | ||
2301c54f | 166 | if (!*mask_start) { |
e1f717d4 YW |
167 | r = sd_netlink_message_append_data(message, WGPEER_A_PRESHARED_KEY, &peer->preshared_key, WG_KEY_LEN); |
168 | if (r < 0) | |
169 | goto cancel; | |
170 | ||
171 | r = sd_netlink_message_append_u32(message, WGPEER_A_FLAGS, peer->flags); | |
172 | if (r < 0) | |
173 | goto cancel; | |
174 | ||
175 | r = sd_netlink_message_append_u16(message, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, peer->persistent_keepalive_interval); | |
176 | if (r < 0) | |
177 | goto cancel; | |
178 | ||
43409486 YW |
179 | if (IN_SET(peer->endpoint.sa.sa_family, AF_INET, AF_INET6)) { |
180 | r = netlink_message_append_sockaddr_union(message, WGPEER_A_ENDPOINT, &peer->endpoint); | |
181 | if (r < 0) | |
182 | goto cancel; | |
183 | } | |
e1f717d4 YW |
184 | } |
185 | ||
186 | r = sd_netlink_message_open_container(message, WGPEER_A_ALLOWEDIPS); | |
187 | if (r < 0) | |
188 | goto cancel; | |
189 | ||
190 | LIST_FOREACH(ipmasks, mask, start) { | |
191 | r = wireguard_set_ipmask_one(netdev, message, mask, ++j); | |
192 | if (r < 0) | |
193 | return r; | |
194 | if (r == 0) | |
195 | break; | |
196 | } | |
197 | ||
198 | r = sd_netlink_message_close_container(message); | |
199 | if (r < 0) | |
200 | return log_netdev_error_errno(netdev, r, "Could not add wireguard allowed ip: %m"); | |
201 | ||
202 | r = sd_netlink_message_close_container(message); | |
203 | if (r < 0) | |
204 | return log_netdev_error_errno(netdev, r, "Could not add wireguard peer: %m"); | |
205 | ||
206 | *mask_start = mask; /* Start next cycle from this mask. */ | |
207 | return !mask; | |
208 | ||
209 | cancel: | |
210 | r = sd_netlink_message_cancel_array(message); | |
211 | if (r < 0) | |
212 | return log_netdev_error_errno(netdev, r, "Could not cancel wireguard peers: %m"); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static int wireguard_set_interface(NetDev *netdev) { | |
e5719363 | 218 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL; |
e1f717d4 YW |
219 | WireguardIPmask *mask_start = NULL; |
220 | WireguardPeer *peer, *peer_start; | |
e5719363 | 221 | uint32_t serial; |
e1f717d4 YW |
222 | Wireguard *w; |
223 | int r; | |
e5719363 JT |
224 | |
225 | assert(netdev); | |
226 | w = WIREGUARD(netdev); | |
227 | assert(w); | |
228 | ||
e1f717d4 YW |
229 | for (peer_start = w->peers; peer_start; ) { |
230 | uint16_t i = 0; | |
e5719363 | 231 | |
e5719363 JT |
232 | message = sd_netlink_message_unref(message); |
233 | ||
234 | r = sd_genl_message_new(netdev->manager->genl, SD_GENL_WIREGUARD, WG_CMD_SET_DEVICE, &message); | |
235 | if (r < 0) | |
236 | return log_netdev_error_errno(netdev, r, "Failed to allocate generic netlink message: %m"); | |
237 | ||
238 | r = sd_netlink_message_append_string(message, WGDEVICE_A_IFNAME, netdev->ifname); | |
239 | if (r < 0) | |
240 | return log_netdev_error_errno(netdev, r, "Could not append wireguard interface name: %m"); | |
241 | ||
242 | if (peer_start == w->peers) { | |
243 | r = sd_netlink_message_append_data(message, WGDEVICE_A_PRIVATE_KEY, &w->private_key, WG_KEY_LEN); | |
244 | if (r < 0) | |
245 | return log_netdev_error_errno(netdev, r, "Could not append wireguard private key: %m"); | |
246 | ||
247 | r = sd_netlink_message_append_u16(message, WGDEVICE_A_LISTEN_PORT, w->port); | |
248 | if (r < 0) | |
249 | return log_netdev_error_errno(netdev, r, "Could not append wireguard port: %m"); | |
250 | ||
251 | r = sd_netlink_message_append_u32(message, WGDEVICE_A_FWMARK, w->fwmark); | |
252 | if (r < 0) | |
253 | return log_netdev_error_errno(netdev, r, "Could not append wireguard fwmark: %m"); | |
254 | ||
255 | r = sd_netlink_message_append_u32(message, WGDEVICE_A_FLAGS, w->flags); | |
256 | if (r < 0) | |
257 | return log_netdev_error_errno(netdev, r, "Could not append wireguard flags: %m"); | |
258 | } | |
259 | ||
260 | r = sd_netlink_message_open_container(message, WGDEVICE_A_PEERS); | |
261 | if (r < 0) | |
262 | return log_netdev_error_errno(netdev, r, "Could not append wireguard peer attributes: %m"); | |
263 | ||
e5719363 | 264 | LIST_FOREACH(peers, peer, peer_start) { |
e1f717d4 | 265 | r = wireguard_set_peer_one(netdev, message, peer, ++i, &mask_start); |
e5719363 | 266 | if (r < 0) |
e1f717d4 YW |
267 | return r; |
268 | if (r == 0) | |
e5719363 | 269 | break; |
e5719363 | 270 | } |
e1f717d4 | 271 | peer_start = peer; /* Start next cycle from this peer. */ |
e5719363 JT |
272 | |
273 | r = sd_netlink_message_close_container(message); | |
274 | if (r < 0) | |
275 | return log_netdev_error_errno(netdev, r, "Could not close wireguard container: %m"); | |
276 | ||
277 | r = sd_netlink_send(netdev->manager->genl, message, &serial); | |
278 | if (r < 0) | |
279 | return log_netdev_error_errno(netdev, r, "Could not set wireguard device: %m"); | |
e1f717d4 | 280 | } |
e5719363 JT |
281 | |
282 | return 0; | |
283 | } | |
284 | ||
f1368a33 YW |
285 | static void wireguard_peer_destroy_callback(WireguardPeer *peer) { |
286 | NetDev *netdev; | |
e5719363 | 287 | |
f1368a33 YW |
288 | assert(peer); |
289 | assert(peer->wireguard); | |
8173d1d0 | 290 | |
f1368a33 | 291 | netdev = NETDEV(peer->wireguard); |
8173d1d0 | 292 | |
f1368a33 YW |
293 | if (section_is_invalid(peer->section)) |
294 | wireguard_peer_free(peer); | |
295 | ||
296 | netdev_unref(netdev); | |
297 | } | |
e5719363 JT |
298 | |
299 | static int on_resolve_retry(sd_event_source *s, usec_t usec, void *userdata) { | |
300 | NetDev *netdev = userdata; | |
301 | Wireguard *w; | |
302 | ||
303 | assert(netdev); | |
304 | w = WIREGUARD(netdev); | |
305 | assert(w); | |
306 | ||
9e2bbf99 | 307 | if (!netdev_is_managed(netdev)) |
56ba90c2 | 308 | return 0; |
e5719363 | 309 | |
f1368a33 YW |
310 | assert(set_isempty(w->peers_with_unresolved_endpoint)); |
311 | ||
312 | SWAP_TWO(w->peers_with_unresolved_endpoint, w->peers_with_failed_endpoint); | |
e5719363 JT |
313 | |
314 | resolve_endpoints(netdev); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Given the number of retries this function will return will an exponential | |
321 | * increasing time in milliseconds to wait starting at 200ms and capped at 25 seconds. | |
322 | */ | |
323 | static int exponential_backoff_milliseconds(unsigned n_retries) { | |
324 | return (2 << MAX(n_retries, 7U)) * 100 * USEC_PER_MSEC; | |
325 | } | |
326 | ||
327 | static int wireguard_resolve_handler(sd_resolve_query *q, | |
328 | int ret, | |
329 | const struct addrinfo *ai, | |
f1368a33 | 330 | WireguardPeer *peer) { |
1061dab1 | 331 | NetDev *netdev; |
e5719363 | 332 | Wireguard *w; |
e5719363 JT |
333 | int r; |
334 | ||
f1368a33 YW |
335 | assert(peer); |
336 | assert(peer->wireguard); | |
e5719363 | 337 | |
f1368a33 YW |
338 | w = peer->wireguard; |
339 | netdev = NETDEV(w); | |
e5719363 | 340 | |
9e2bbf99 | 341 | if (!netdev_is_managed(netdev)) |
8173d1d0 | 342 | return 0; |
e5719363 JT |
343 | |
344 | if (ret != 0) { | |
f1368a33 YW |
345 | log_netdev_error(netdev, "Failed to resolve host '%s:%s': %s", peer->endpoint_host, peer->endpoint_port, gai_strerror(ret)); |
346 | ||
347 | r = set_ensure_allocated(&w->peers_with_failed_endpoint, NULL); | |
348 | if (r < 0) { | |
349 | log_oom(); | |
350 | peer->section->invalid = true; | |
351 | goto resolve_next; | |
352 | } | |
353 | ||
354 | r = set_put(w->peers_with_failed_endpoint, peer); | |
355 | if (r < 0) { | |
356 | log_netdev_error(netdev, "Failed to save a peer, dropping the peer: %m"); | |
357 | peer->section->invalid = true; | |
358 | goto resolve_next; | |
359 | } | |
360 | ||
e5719363 | 361 | } else if ((ai->ai_family == AF_INET && ai->ai_addrlen == sizeof(struct sockaddr_in)) || |
8173d1d0 | 362 | (ai->ai_family == AF_INET6 && ai->ai_addrlen == sizeof(struct sockaddr_in6))) |
f1368a33 | 363 | memcpy(&peer->endpoint, ai->ai_addr, ai->ai_addrlen); |
e5719363 | 364 | else |
f1368a33 YW |
365 | log_netdev_error(netdev, "Neither IPv4 nor IPv6 address found for peer endpoint %s:%s, ignoring the address.", |
366 | peer->endpoint_host, peer->endpoint_port); | |
e5719363 | 367 | |
f1368a33 YW |
368 | resolve_next: |
369 | if (!set_isempty(w->peers_with_unresolved_endpoint)) { | |
e5719363 JT |
370 | resolve_endpoints(netdev); |
371 | return 0; | |
372 | } | |
373 | ||
e1f717d4 | 374 | (void) wireguard_set_interface(netdev); |
f1368a33 YW |
375 | |
376 | if (!set_isempty(w->peers_with_failed_endpoint)) { | |
85c987a8 | 377 | usec_t usec; |
56ba90c2 | 378 | |
e5719363 | 379 | w->n_retries++; |
85c987a8 YW |
380 | usec = usec_add(now(CLOCK_MONOTONIC), exponential_backoff_milliseconds(w->n_retries)); |
381 | r = event_reset_time(netdev->manager->event, &w->resolve_retry_event_source, | |
382 | CLOCK_MONOTONIC, usec, 0, on_resolve_retry, netdev, | |
383 | 0, "wireguard-resolve-retry", true); | |
56ba90c2 | 384 | if (r < 0) { |
e5719363 | 385 | log_netdev_warning_errno(netdev, r, "Could not arm resolve retry handler: %m"); |
56ba90c2 YW |
386 | return 0; |
387 | } | |
e5719363 JT |
388 | } |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | static void resolve_endpoints(NetDev *netdev) { | |
e5719363 JT |
394 | static const struct addrinfo hints = { |
395 | .ai_family = AF_UNSPEC, | |
396 | .ai_socktype = SOCK_DGRAM, | |
397 | .ai_protocol = IPPROTO_UDP | |
398 | }; | |
f1368a33 | 399 | WireguardPeer *peer; |
8173d1d0 | 400 | Wireguard *w; |
f1368a33 | 401 | Iterator i; |
8173d1d0 | 402 | int r = 0; |
e5719363 JT |
403 | |
404 | assert(netdev); | |
405 | w = WIREGUARD(netdev); | |
406 | assert(w); | |
407 | ||
f1368a33 | 408 | SET_FOREACH(peer, w->peers_with_unresolved_endpoint, i) { |
1061dab1 YW |
409 | r = resolve_getaddrinfo(netdev->manager->resolve, |
410 | NULL, | |
f1368a33 YW |
411 | peer->endpoint_host, |
412 | peer->endpoint_port, | |
1061dab1 YW |
413 | &hints, |
414 | wireguard_resolve_handler, | |
f1368a33 YW |
415 | wireguard_peer_destroy_callback, |
416 | peer); | |
e5719363 JT |
417 | if (r == -ENOBUFS) |
418 | break; | |
8173d1d0 YW |
419 | if (r < 0) { |
420 | log_netdev_error_errno(netdev, r, "Failed to create resolver: %m"); | |
421 | continue; | |
422 | } | |
e5719363 | 423 | |
8173d1d0 YW |
424 | /* Avoid freeing netdev. It will be unrefed by the destroy callback. */ |
425 | netdev_ref(netdev); | |
426 | ||
f1368a33 | 427 | (void) set_remove(w->peers_with_unresolved_endpoint, peer); |
e5719363 JT |
428 | } |
429 | } | |
430 | ||
e5719363 JT |
431 | static int netdev_wireguard_post_create(NetDev *netdev, Link *link, sd_netlink_message *m) { |
432 | Wireguard *w; | |
433 | ||
434 | assert(netdev); | |
435 | w = WIREGUARD(netdev); | |
436 | assert(w); | |
437 | ||
e1f717d4 | 438 | (void) wireguard_set_interface(netdev); |
e5719363 JT |
439 | resolve_endpoints(netdev); |
440 | return 0; | |
441 | } | |
442 | ||
443 | int config_parse_wireguard_listen_port(const char *unit, | |
444 | const char *filename, | |
445 | unsigned line, | |
446 | const char *section, | |
447 | unsigned section_line, | |
448 | const char *lvalue, | |
449 | int ltype, | |
450 | const char *rvalue, | |
451 | void *data, | |
452 | void *userdata) { | |
453 | uint16_t *s = data; | |
454 | uint16_t port = 0; | |
455 | int r; | |
456 | ||
457 | assert(rvalue); | |
458 | assert(data); | |
459 | ||
460 | if (!streq(rvalue, "auto")) { | |
f1368a33 YW |
461 | r = parse_ip_port(rvalue, s); |
462 | if (r < 0) { | |
463 | log_syntax(unit, LOG_ERR, filename, line, r, | |
464 | "Invalid port specification, ignoring assignment: %s", rvalue); | |
465 | return 0; | |
466 | } | |
e5719363 JT |
467 | } |
468 | ||
469 | *s = port; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
fedcb4c3 YW |
474 | static int wireguard_decode_key_and_warn( |
475 | const char *rvalue, | |
476 | uint8_t *ret, | |
477 | const char *unit, | |
478 | const char *filename, | |
479 | unsigned line, | |
480 | const char *lvalue) { | |
e5719363 JT |
481 | _cleanup_free_ void *key = NULL; |
482 | size_t len; | |
483 | int r; | |
484 | ||
e5719363 | 485 | assert(rvalue); |
fedcb4c3 YW |
486 | assert(ret); |
487 | assert(filename); | |
488 | assert(lvalue); | |
489 | ||
490 | if (isempty(rvalue)) { | |
491 | memzero(ret, WG_KEY_LEN); | |
492 | return 0; | |
493 | } | |
e5719363 JT |
494 | |
495 | r = unbase64mem(rvalue, strlen(rvalue), &key, &len); | |
496 | if (r < 0) { | |
f1368a33 | 497 | log_syntax(unit, LOG_ERR, filename, line, r, |
583eb170 | 498 | "Failed to decode wireguard key provided by %s=, ignoring assignment: %m", lvalue); |
e5719363 JT |
499 | return 0; |
500 | } | |
501 | if (len != WG_KEY_LEN) { | |
583eb170 YW |
502 | log_syntax(unit, LOG_ERR, filename, line, 0, |
503 | "Wireguard key provided by %s= has invalid length (%zu bytes), ignoring assignment.", | |
504 | lvalue, len); | |
e5719363 JT |
505 | return 0; |
506 | } | |
507 | ||
fedcb4c3 | 508 | memcpy(ret, key, WG_KEY_LEN); |
e5719363 JT |
509 | return true; |
510 | } | |
511 | ||
512 | int config_parse_wireguard_private_key(const char *unit, | |
513 | const char *filename, | |
514 | unsigned line, | |
515 | const char *section, | |
516 | unsigned section_line, | |
517 | const char *lvalue, | |
518 | int ltype, | |
519 | const char *rvalue, | |
520 | void *data, | |
521 | void *userdata) { | |
522 | Wireguard *w; | |
523 | ||
524 | assert(data); | |
525 | ||
526 | w = WIREGUARD(data); | |
527 | ||
528 | assert(w); | |
529 | ||
fedcb4c3 | 530 | return wireguard_decode_key_and_warn(rvalue, w->private_key, unit, filename, line, lvalue); |
e5719363 JT |
531 | |
532 | } | |
533 | ||
76df7779 YW |
534 | int config_parse_wireguard_private_key_file( |
535 | const char *unit, | |
536 | const char *filename, | |
537 | unsigned line, | |
538 | const char *section, | |
539 | unsigned section_line, | |
540 | const char *lvalue, | |
541 | int ltype, | |
542 | const char *rvalue, | |
543 | void *data, | |
544 | void *userdata) { | |
545 | ||
546 | _cleanup_free_ char *path = NULL; | |
547 | Wireguard *w; | |
548 | ||
549 | assert(data); | |
550 | w = WIREGUARD(data); | |
551 | assert(w); | |
552 | ||
553 | if (isempty(rvalue)) { | |
554 | w->private_key_file = mfree(w->private_key_file); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | path = strdup(rvalue); | |
559 | if (!path) | |
560 | return log_oom(); | |
561 | ||
562 | if (path_simplify_and_warn(path, PATH_CHECK_ABSOLUTE, unit, filename, line, lvalue) < 0) | |
563 | return 0; | |
564 | ||
565 | return free_and_replace(w->private_key_file, path); | |
566 | } | |
567 | ||
e5719363 JT |
568 | int config_parse_wireguard_preshared_key(const char *unit, |
569 | const char *filename, | |
570 | unsigned line, | |
571 | const char *section, | |
572 | unsigned section_line, | |
573 | const char *lvalue, | |
574 | int ltype, | |
575 | const char *rvalue, | |
576 | void *data, | |
577 | void *userdata) { | |
f1368a33 YW |
578 | |
579 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
e5719363 | 580 | Wireguard *w; |
f1368a33 | 581 | int r; |
e5719363 JT |
582 | |
583 | assert(data); | |
584 | ||
585 | w = WIREGUARD(data); | |
586 | ||
587 | assert(w); | |
588 | ||
f1368a33 YW |
589 | r = wireguard_peer_new_static(w, filename, section_line, &peer); |
590 | if (r < 0) | |
591 | return r; | |
e5719363 | 592 | |
fedcb4c3 | 593 | r = wireguard_decode_key_and_warn(rvalue, peer->preshared_key, unit, filename, line, lvalue); |
f1368a33 YW |
594 | if (r < 0) |
595 | return r; | |
596 | ||
597 | TAKE_PTR(peer); | |
598 | return 0; | |
e5719363 JT |
599 | } |
600 | ||
e5719363 JT |
601 | int config_parse_wireguard_public_key(const char *unit, |
602 | const char *filename, | |
603 | unsigned line, | |
604 | const char *section, | |
605 | unsigned section_line, | |
606 | const char *lvalue, | |
607 | int ltype, | |
608 | const char *rvalue, | |
609 | void *data, | |
610 | void *userdata) { | |
f1368a33 YW |
611 | |
612 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
e5719363 | 613 | Wireguard *w; |
f1368a33 | 614 | int r; |
e5719363 JT |
615 | |
616 | assert(data); | |
617 | ||
618 | w = WIREGUARD(data); | |
619 | ||
620 | assert(w); | |
621 | ||
f1368a33 YW |
622 | r = wireguard_peer_new_static(w, filename, section_line, &peer); |
623 | if (r < 0) | |
624 | return r; | |
625 | ||
fedcb4c3 | 626 | r = wireguard_decode_key_and_warn(rvalue, peer->public_key, unit, filename, line, lvalue); |
f1368a33 YW |
627 | if (r < 0) |
628 | return r; | |
e5719363 | 629 | |
f1368a33 YW |
630 | TAKE_PTR(peer); |
631 | return 0; | |
e5719363 JT |
632 | } |
633 | ||
634 | int config_parse_wireguard_allowed_ips(const char *unit, | |
635 | const char *filename, | |
636 | unsigned line, | |
637 | const char *section, | |
638 | unsigned section_line, | |
639 | const char *lvalue, | |
640 | int ltype, | |
641 | const char *rvalue, | |
642 | void *data, | |
643 | void *userdata) { | |
f1368a33 YW |
644 | |
645 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
e5719363 JT |
646 | union in_addr_union addr; |
647 | unsigned char prefixlen; | |
648 | int r, family; | |
649 | Wireguard *w; | |
e5719363 JT |
650 | WireguardIPmask *ipmask; |
651 | ||
652 | assert(rvalue); | |
653 | assert(data); | |
654 | ||
655 | w = WIREGUARD(data); | |
656 | ||
f1368a33 YW |
657 | assert(w); |
658 | ||
659 | r = wireguard_peer_new_static(w, filename, section_line, &peer); | |
660 | if (r < 0) | |
661 | return r; | |
e5719363 JT |
662 | |
663 | for (;;) { | |
664 | _cleanup_free_ char *word = NULL; | |
665 | ||
666 | r = extract_first_word(&rvalue, &word, "," WHITESPACE, 0); | |
667 | if (r == 0) | |
668 | break; | |
669 | if (r == -ENOMEM) | |
670 | return log_oom(); | |
671 | if (r < 0) { | |
f1368a33 YW |
672 | log_syntax(unit, LOG_ERR, filename, line, r, |
673 | "Failed to split allowed ips \"%s\" option: %m", rvalue); | |
e5719363 JT |
674 | break; |
675 | } | |
676 | ||
677 | r = in_addr_prefix_from_string_auto(word, &family, &addr, &prefixlen); | |
678 | if (r < 0) { | |
f1368a33 YW |
679 | log_syntax(unit, LOG_ERR, filename, line, r, |
680 | "Network address is invalid, ignoring assignment: %s", word); | |
681 | continue; | |
e5719363 JT |
682 | } |
683 | ||
fc721553 | 684 | ipmask = new(WireguardIPmask, 1); |
e5719363 JT |
685 | if (!ipmask) |
686 | return log_oom(); | |
fc721553 YW |
687 | |
688 | *ipmask = (WireguardIPmask) { | |
689 | .family = family, | |
690 | .ip.in6 = addr.in6, | |
691 | .cidr = prefixlen, | |
692 | }; | |
e5719363 JT |
693 | |
694 | LIST_PREPEND(ipmasks, peer->ipmasks, ipmask); | |
695 | } | |
696 | ||
f1368a33 | 697 | TAKE_PTR(peer); |
e5719363 JT |
698 | return 0; |
699 | } | |
700 | ||
701 | int config_parse_wireguard_endpoint(const char *unit, | |
702 | const char *filename, | |
703 | unsigned line, | |
704 | const char *section, | |
705 | unsigned section_line, | |
706 | const char *lvalue, | |
707 | int ltype, | |
708 | const char *rvalue, | |
709 | void *data, | |
710 | void *userdata) { | |
f1368a33 YW |
711 | |
712 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
713 | const char *begin, *end; | |
e5719363 | 714 | Wireguard *w; |
e5719363 | 715 | size_t len; |
f1368a33 | 716 | int r; |
e5719363 JT |
717 | |
718 | assert(data); | |
719 | assert(rvalue); | |
720 | ||
721 | w = WIREGUARD(data); | |
722 | ||
723 | assert(w); | |
724 | ||
f1368a33 YW |
725 | r = wireguard_peer_new_static(w, filename, section_line, &peer); |
726 | if (r < 0) | |
727 | return r; | |
e5719363 | 728 | |
e5719363 JT |
729 | if (rvalue[0] == '[') { |
730 | begin = &rvalue[1]; | |
731 | end = strchr(rvalue, ']'); | |
732 | if (!end) { | |
f1368a33 YW |
733 | log_syntax(unit, LOG_ERR, filename, line, 0, |
734 | "Unable to find matching brace of endpoint, ignoring assignment: %s", | |
735 | rvalue); | |
e5719363 JT |
736 | return 0; |
737 | } | |
738 | len = end - begin; | |
739 | ++end; | |
740 | if (*end != ':' || !*(end + 1)) { | |
f1368a33 YW |
741 | log_syntax(unit, LOG_ERR, filename, line, 0, |
742 | "Unable to find port of endpoint, ignoring assignment: %s", | |
743 | rvalue); | |
e5719363 JT |
744 | return 0; |
745 | } | |
746 | ++end; | |
747 | } else { | |
748 | begin = rvalue; | |
749 | end = strrchr(rvalue, ':'); | |
750 | if (!end || !*(end + 1)) { | |
f1368a33 YW |
751 | log_syntax(unit, LOG_ERR, filename, line, 0, |
752 | "Unable to find port of endpoint, ignoring assignment: %s", | |
753 | rvalue); | |
e5719363 JT |
754 | return 0; |
755 | } | |
756 | len = end - begin; | |
757 | ++end; | |
758 | } | |
759 | ||
f1368a33 YW |
760 | peer->endpoint_host = strndup(begin, len); |
761 | if (!peer->endpoint_host) | |
e5719363 JT |
762 | return log_oom(); |
763 | ||
f1368a33 YW |
764 | peer->endpoint_port = strdup(end); |
765 | if (!peer->endpoint_port) | |
e5719363 JT |
766 | return log_oom(); |
767 | ||
f1368a33 YW |
768 | r = set_ensure_allocated(&w->peers_with_unresolved_endpoint, NULL); |
769 | if (r < 0) | |
fc721553 YW |
770 | return log_oom(); |
771 | ||
f1368a33 YW |
772 | r = set_put(w->peers_with_unresolved_endpoint, peer); |
773 | if (r < 0) | |
774 | return r; | |
e5719363 | 775 | |
f1368a33 | 776 | TAKE_PTR(peer); |
e5719363 JT |
777 | return 0; |
778 | } | |
779 | ||
780 | int config_parse_wireguard_keepalive(const char *unit, | |
781 | const char *filename, | |
782 | unsigned line, | |
783 | const char *section, | |
784 | unsigned section_line, | |
785 | const char *lvalue, | |
786 | int ltype, | |
787 | const char *rvalue, | |
788 | void *data, | |
789 | void *userdata) { | |
f1368a33 YW |
790 | |
791 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
e5719363 JT |
792 | uint16_t keepalive = 0; |
793 | Wireguard *w; | |
f1368a33 | 794 | int r; |
e5719363 JT |
795 | |
796 | assert(rvalue); | |
797 | assert(data); | |
798 | ||
799 | w = WIREGUARD(data); | |
800 | ||
801 | assert(w); | |
802 | ||
f1368a33 YW |
803 | r = wireguard_peer_new_static(w, filename, section_line, &peer); |
804 | if (r < 0) | |
805 | return r; | |
e5719363 JT |
806 | |
807 | if (streq(rvalue, "off")) | |
808 | keepalive = 0; | |
809 | else { | |
810 | r = safe_atou16(rvalue, &keepalive); | |
f1368a33 YW |
811 | if (r < 0) { |
812 | log_syntax(unit, LOG_ERR, filename, line, r, | |
813 | "The persistent keepalive interval must be 0-65535. Ignore assignment: %s", | |
814 | rvalue); | |
815 | return 0; | |
816 | } | |
e5719363 JT |
817 | } |
818 | ||
819 | peer->persistent_keepalive_interval = keepalive; | |
f1368a33 YW |
820 | |
821 | TAKE_PTR(peer); | |
e5719363 JT |
822 | return 0; |
823 | } | |
824 | ||
825 | static void wireguard_init(NetDev *netdev) { | |
826 | Wireguard *w; | |
827 | ||
828 | assert(netdev); | |
829 | ||
830 | w = WIREGUARD(netdev); | |
831 | ||
832 | assert(w); | |
833 | ||
834 | w->flags = WGDEVICE_F_REPLACE_PEERS; | |
835 | } | |
836 | ||
837 | static void wireguard_done(NetDev *netdev) { | |
838 | Wireguard *w; | |
e5719363 JT |
839 | |
840 | assert(netdev); | |
841 | w = WIREGUARD(netdev); | |
c195364d | 842 | assert(w); |
e5719363 | 843 | |
85c987a8 YW |
844 | sd_event_source_unref(w->resolve_retry_event_source); |
845 | ||
76df7779 YW |
846 | free(w->private_key_file); |
847 | ||
f1368a33 YW |
848 | hashmap_free_with_destructor(w->peers_by_section, wireguard_peer_free); |
849 | set_free(w->peers_with_unresolved_endpoint); | |
850 | set_free(w->peers_with_failed_endpoint); | |
851 | } | |
c195364d | 852 | |
76df7779 YW |
853 | static int wireguard_read_private_key_file(Wireguard *w, bool fatal) { |
854 | _cleanup_free_ char *contents = NULL; | |
855 | _cleanup_free_ void *key = NULL; | |
856 | size_t size, key_len; | |
857 | NetDev *netdev; | |
858 | int level, r; | |
859 | ||
860 | assert(w); | |
861 | ||
862 | netdev = NETDEV(w); | |
863 | ||
864 | if (!w->private_key_file) | |
865 | return 0; | |
866 | ||
867 | level = fatal ? LOG_ERR : LOG_INFO; | |
868 | ||
869 | r = read_full_file(w->private_key_file, &contents, &size); | |
870 | if (r < 0) | |
871 | return log_netdev_full(netdev, level, r, | |
872 | "Failed to read private key from '%s'%s: %m", | |
873 | w->private_key_file, fatal ? "" : ", ignoring"); | |
874 | ||
875 | r = unbase64mem(contents, size, &key, &key_len); | |
876 | if (r < 0) | |
877 | return log_netdev_full(netdev, level, r, | |
878 | "Failed to decode private key%s: %m", | |
879 | fatal ? "" : ", ignoring"); | |
880 | ||
881 | if (key_len != WG_KEY_LEN) | |
882 | return log_netdev_full(netdev, level, SYNTHETIC_ERRNO(EINVAL), | |
883 | "Wireguard private key has invalid length (%zu bytes)%s: %m", | |
884 | key_len, fatal ? "" : ", ignoring"); | |
885 | ||
886 | memcpy(w->private_key, key, WG_KEY_LEN); | |
887 | return 0; | |
888 | } | |
889 | ||
9cc9021a YW |
890 | static int wireguard_peer_verify(WireguardPeer *peer) { |
891 | NetDev *netdev = NETDEV(peer->wireguard); | |
892 | ||
893 | if (section_is_invalid(peer->section)) | |
894 | return -EINVAL; | |
895 | ||
896 | if (eqzero(peer->public_key)) | |
897 | return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), | |
898 | "%s: WireGuardPeer section without PublicKey= configured. " | |
899 | "Ignoring [WireGuardPeer] section from line %u.", | |
900 | peer->section->filename, peer->section->line); | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
f1368a33 YW |
905 | static int wireguard_verify(NetDev *netdev, const char *filename) { |
906 | WireguardPeer *peer, *peer_next; | |
907 | Wireguard *w; | |
76df7779 YW |
908 | bool empty; |
909 | int r; | |
c195364d | 910 | |
f1368a33 YW |
911 | assert(netdev); |
912 | w = WIREGUARD(netdev); | |
913 | assert(w); | |
914 | ||
76df7779 YW |
915 | empty = eqzero(w->private_key); |
916 | if (empty && !w->private_key_file) | |
9cc9021a YW |
917 | return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), |
918 | "%s: Missing PrivateKey= or PrivateKeyFile=, ignoring.", | |
919 | filename); | |
920 | ||
76df7779 YW |
921 | r = wireguard_read_private_key_file(w, empty); |
922 | if (r < 0 && empty) | |
923 | return r; | |
924 | ||
f1368a33 | 925 | LIST_FOREACH_SAFE(peers, peer, peer_next, w->peers) |
9cc9021a | 926 | if (wireguard_peer_verify(peer) < 0) |
f1368a33 YW |
927 | wireguard_peer_free(peer); |
928 | ||
929 | return 0; | |
e5719363 JT |
930 | } |
931 | ||
932 | const NetDevVTable wireguard_vtable = { | |
933 | .object_size = sizeof(Wireguard), | |
934 | .sections = "Match\0NetDev\0WireGuard\0WireGuardPeer\0", | |
935 | .post_create = netdev_wireguard_post_create, | |
936 | .init = wireguard_init, | |
937 | .done = wireguard_done, | |
938 | .create_type = NETDEV_CREATE_INDEPENDENT, | |
f1368a33 | 939 | .config_verify = wireguard_verify, |
e5719363 | 940 | }; |