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Commit | Line | Data |
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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" |
0a970718 | 16 | #include "memory-util.h" |
43409486 | 17 | #include "netlink-util.h" |
e5719363 | 18 | #include "networkd-link.h" |
e5719363 | 19 | #include "networkd-manager.h" |
a4c9ae40 YW |
20 | #include "networkd-util.h" |
21 | #include "parse-util.h" | |
76df7779 | 22 | #include "path-util.h" |
1061dab1 | 23 | #include "resolve-private.h" |
a4c9ae40 YW |
24 | #include "string-util.h" |
25 | #include "strv.h" | |
e5719363 | 26 | #include "wireguard-netlink.h" |
0a970718 | 27 | #include "wireguard.h" |
e5719363 JT |
28 | |
29 | static void resolve_endpoints(NetDev *netdev); | |
30 | ||
f1368a33 YW |
31 | static void wireguard_peer_free(WireguardPeer *peer) { |
32 | WireguardIPmask *mask; | |
33 | ||
34 | if (!peer) | |
35 | return; | |
36 | ||
37 | if (peer->wireguard) { | |
38 | LIST_REMOVE(peers, peer->wireguard->peers, peer); | |
39 | ||
40 | set_remove(peer->wireguard->peers_with_unresolved_endpoint, peer); | |
41 | set_remove(peer->wireguard->peers_with_failed_endpoint, peer); | |
42 | ||
43 | if (peer->section) | |
44 | hashmap_remove(peer->wireguard->peers_by_section, peer->section); | |
45 | } | |
46 | ||
47 | network_config_section_free(peer->section); | |
48 | ||
49 | while ((mask = peer->ipmasks)) { | |
50 | LIST_REMOVE(ipmasks, peer->ipmasks, mask); | |
51 | free(mask); | |
52 | } | |
53 | ||
54 | free(peer->endpoint_host); | |
55 | free(peer->endpoint_port); | |
56 | ||
57 | free(peer); | |
58 | } | |
59 | ||
60 | DEFINE_NETWORK_SECTION_FUNCTIONS(WireguardPeer, wireguard_peer_free); | |
61 | ||
62 | static int wireguard_peer_new_static(Wireguard *w, const char *filename, unsigned section_line, WireguardPeer **ret) { | |
63 | _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL; | |
64 | _cleanup_(wireguard_peer_freep) WireguardPeer *peer = NULL; | |
65 | int r; | |
e5719363 JT |
66 | |
67 | assert(w); | |
f1368a33 YW |
68 | assert(ret); |
69 | assert(filename); | |
70 | assert(section_line > 0); | |
e5719363 | 71 | |
f1368a33 YW |
72 | r = network_config_section_new(filename, section_line, &n); |
73 | if (r < 0) | |
74 | return r; | |
75 | ||
76 | peer = hashmap_get(w->peers_by_section, n); | |
77 | if (peer) { | |
78 | *ret = TAKE_PTR(peer); | |
79 | return 0; | |
80 | } | |
e5719363 | 81 | |
fc721553 | 82 | peer = new(WireguardPeer, 1); |
e5719363 | 83 | if (!peer) |
f1368a33 | 84 | return -ENOMEM; |
fc721553 YW |
85 | |
86 | *peer = (WireguardPeer) { | |
87 | .flags = WGPEER_F_REPLACE_ALLOWEDIPS, | |
f1368a33 YW |
88 | .wireguard = w, |
89 | .section = TAKE_PTR(n), | |
fc721553 | 90 | }; |
e5719363 JT |
91 | |
92 | LIST_PREPEND(peers, w->peers, peer); | |
e5719363 | 93 | |
f1368a33 YW |
94 | r = hashmap_ensure_allocated(&w->peers_by_section, &network_config_hash_ops); |
95 | if (r < 0) | |
96 | return r; | |
97 | ||
98 | r = hashmap_put(w->peers_by_section, peer->section, peer); | |
99 | if (r < 0) | |
100 | return r; | |
101 | ||
102 | *ret = TAKE_PTR(peer); | |
103 | return 0; | |
e5719363 JT |
104 | } |
105 | ||
e1f717d4 | 106 | static int wireguard_set_ipmask_one(NetDev *netdev, sd_netlink_message *message, const WireguardIPmask *mask, uint16_t index) { |
e5719363 | 107 | int r; |
e1f717d4 YW |
108 | |
109 | assert(message); | |
110 | assert(mask); | |
111 | assert(index > 0); | |
112 | ||
113 | /* This returns 1 on success, 0 on recoverable error, and negative errno on failure. */ | |
114 | ||
115 | r = sd_netlink_message_open_array(message, index); | |
116 | if (r < 0) | |
117 | return 0; | |
118 | ||
119 | r = sd_netlink_message_append_u16(message, WGALLOWEDIP_A_FAMILY, mask->family); | |
120 | if (r < 0) | |
121 | goto cancel; | |
122 | ||
43409486 | 123 | r = netlink_message_append_in_addr_union(message, WGALLOWEDIP_A_IPADDR, mask->family, &mask->ip); |
e1f717d4 YW |
124 | if (r < 0) |
125 | goto cancel; | |
126 | ||
127 | r = sd_netlink_message_append_u8(message, WGALLOWEDIP_A_CIDR_MASK, mask->cidr); | |
128 | if (r < 0) | |
129 | goto cancel; | |
130 | ||
131 | r = sd_netlink_message_close_container(message); | |
132 | if (r < 0) | |
133 | return log_netdev_error_errno(netdev, r, "Could not add wireguard allowed ip: %m"); | |
134 | ||
135 | return 1; | |
136 | ||
137 | cancel: | |
138 | r = sd_netlink_message_cancel_array(message); | |
139 | if (r < 0) | |
140 | return log_netdev_error_errno(netdev, r, "Could not cancel wireguard allowed ip message attribute: %m"); | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static int wireguard_set_peer_one(NetDev *netdev, sd_netlink_message *message, const WireguardPeer *peer, uint16_t index, WireguardIPmask **mask_start) { | |
146 | WireguardIPmask *mask, *start; | |
147 | uint16_t j = 0; | |
148 | int r; | |
149 | ||
150 | assert(message); | |
151 | assert(peer); | |
152 | assert(index > 0); | |
153 | assert(mask_start); | |
154 | ||
155 | /* This returns 1 on success, 0 on recoverable error, and negative errno on failure. */ | |
156 | ||
157 | start = *mask_start ?: peer->ipmasks; | |
158 | ||
159 | r = sd_netlink_message_open_array(message, index); | |
160 | if (r < 0) | |
161 | return 0; | |
162 | ||
163 | r = sd_netlink_message_append_data(message, WGPEER_A_PUBLIC_KEY, &peer->public_key, sizeof(peer->public_key)); | |
164 | if (r < 0) | |
165 | goto cancel; | |
166 | ||
2301c54f | 167 | if (!*mask_start) { |
e1f717d4 YW |
168 | r = sd_netlink_message_append_data(message, WGPEER_A_PRESHARED_KEY, &peer->preshared_key, WG_KEY_LEN); |
169 | if (r < 0) | |
170 | goto cancel; | |
171 | ||
172 | r = sd_netlink_message_append_u32(message, WGPEER_A_FLAGS, peer->flags); | |
173 | if (r < 0) | |
174 | goto cancel; | |
175 | ||
176 | r = sd_netlink_message_append_u16(message, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, peer->persistent_keepalive_interval); | |
177 | if (r < 0) | |
178 | goto cancel; | |
179 | ||
43409486 YW |
180 | if (IN_SET(peer->endpoint.sa.sa_family, AF_INET, AF_INET6)) { |
181 | r = netlink_message_append_sockaddr_union(message, WGPEER_A_ENDPOINT, &peer->endpoint); | |
182 | if (r < 0) | |
183 | goto cancel; | |
184 | } | |
e1f717d4 YW |
185 | } |
186 | ||
187 | r = sd_netlink_message_open_container(message, WGPEER_A_ALLOWEDIPS); | |
188 | if (r < 0) | |
189 | goto cancel; | |
190 | ||
191 | LIST_FOREACH(ipmasks, mask, start) { | |
192 | r = wireguard_set_ipmask_one(netdev, message, mask, ++j); | |
193 | if (r < 0) | |
194 | return r; | |
195 | if (r == 0) | |
196 | break; | |
197 | } | |
198 | ||
199 | r = sd_netlink_message_close_container(message); | |
200 | if (r < 0) | |
201 | return log_netdev_error_errno(netdev, r, "Could not add wireguard allowed ip: %m"); | |
202 | ||
203 | r = sd_netlink_message_close_container(message); | |
204 | if (r < 0) | |
205 | return log_netdev_error_errno(netdev, r, "Could not add wireguard peer: %m"); | |
206 | ||
207 | *mask_start = mask; /* Start next cycle from this mask. */ | |
208 | return !mask; | |
209 | ||
210 | cancel: | |
211 | r = sd_netlink_message_cancel_array(message); | |
212 | if (r < 0) | |
213 | return log_netdev_error_errno(netdev, r, "Could not cancel wireguard peers: %m"); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | static int wireguard_set_interface(NetDev *netdev) { | |
e5719363 | 219 | _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL; |
e1f717d4 YW |
220 | WireguardIPmask *mask_start = NULL; |
221 | WireguardPeer *peer, *peer_start; | |
e5719363 | 222 | uint32_t serial; |
e1f717d4 YW |
223 | Wireguard *w; |
224 | int r; | |
e5719363 JT |
225 | |
226 | assert(netdev); | |
227 | w = WIREGUARD(netdev); | |
228 | assert(w); | |
229 | ||
e1f717d4 YW |
230 | for (peer_start = w->peers; peer_start; ) { |
231 | uint16_t i = 0; | |
e5719363 | 232 | |
e5719363 JT |
233 | message = sd_netlink_message_unref(message); |
234 | ||
235 | r = sd_genl_message_new(netdev->manager->genl, SD_GENL_WIREGUARD, WG_CMD_SET_DEVICE, &message); | |
236 | if (r < 0) | |
237 | return log_netdev_error_errno(netdev, r, "Failed to allocate generic netlink message: %m"); | |
238 | ||
239 | r = sd_netlink_message_append_string(message, WGDEVICE_A_IFNAME, netdev->ifname); | |
240 | if (r < 0) | |
241 | return log_netdev_error_errno(netdev, r, "Could not append wireguard interface name: %m"); | |
242 | ||
243 | if (peer_start == w->peers) { | |
244 | r = sd_netlink_message_append_data(message, WGDEVICE_A_PRIVATE_KEY, &w->private_key, WG_KEY_LEN); | |
245 | if (r < 0) | |
246 | return log_netdev_error_errno(netdev, r, "Could not append wireguard private key: %m"); | |
247 | ||
248 | r = sd_netlink_message_append_u16(message, WGDEVICE_A_LISTEN_PORT, w->port); | |
249 | if (r < 0) | |
250 | return log_netdev_error_errno(netdev, r, "Could not append wireguard port: %m"); | |
251 | ||
252 | r = sd_netlink_message_append_u32(message, WGDEVICE_A_FWMARK, w->fwmark); | |
253 | if (r < 0) | |
254 | return log_netdev_error_errno(netdev, r, "Could not append wireguard fwmark: %m"); | |
255 | ||
256 | r = sd_netlink_message_append_u32(message, WGDEVICE_A_FLAGS, w->flags); | |
257 | if (r < 0) | |
258 | return log_netdev_error_errno(netdev, r, "Could not append wireguard flags: %m"); | |
259 | } | |
260 | ||
261 | r = sd_netlink_message_open_container(message, WGDEVICE_A_PEERS); | |
262 | if (r < 0) | |
263 | return log_netdev_error_errno(netdev, r, "Could not append wireguard peer attributes: %m"); | |
264 | ||
e5719363 | 265 | LIST_FOREACH(peers, peer, peer_start) { |
e1f717d4 | 266 | r = wireguard_set_peer_one(netdev, message, peer, ++i, &mask_start); |
e5719363 | 267 | if (r < 0) |
e1f717d4 YW |
268 | return r; |
269 | if (r == 0) | |
e5719363 | 270 | break; |
e5719363 | 271 | } |
e1f717d4 | 272 | peer_start = peer; /* Start next cycle from this peer. */ |
e5719363 JT |
273 | |
274 | r = sd_netlink_message_close_container(message); | |
275 | if (r < 0) | |
276 | return log_netdev_error_errno(netdev, r, "Could not close wireguard container: %m"); | |
277 | ||
278 | r = sd_netlink_send(netdev->manager->genl, message, &serial); | |
279 | if (r < 0) | |
280 | return log_netdev_error_errno(netdev, r, "Could not set wireguard device: %m"); | |
e1f717d4 | 281 | } |
e5719363 JT |
282 | |
283 | return 0; | |
284 | } | |
285 | ||
f1368a33 YW |
286 | static void wireguard_peer_destroy_callback(WireguardPeer *peer) { |
287 | NetDev *netdev; | |
e5719363 | 288 | |
f1368a33 YW |
289 | assert(peer); |
290 | assert(peer->wireguard); | |
8173d1d0 | 291 | |
f1368a33 | 292 | netdev = NETDEV(peer->wireguard); |
8173d1d0 | 293 | |
f1368a33 YW |
294 | if (section_is_invalid(peer->section)) |
295 | wireguard_peer_free(peer); | |
296 | ||
297 | netdev_unref(netdev); | |
298 | } | |
e5719363 JT |
299 | |
300 | static int on_resolve_retry(sd_event_source *s, usec_t usec, void *userdata) { | |
301 | NetDev *netdev = userdata; | |
302 | Wireguard *w; | |
303 | ||
304 | assert(netdev); | |
305 | w = WIREGUARD(netdev); | |
306 | assert(w); | |
307 | ||
9e2bbf99 | 308 | if (!netdev_is_managed(netdev)) |
56ba90c2 | 309 | return 0; |
e5719363 | 310 | |
f1368a33 YW |
311 | assert(set_isempty(w->peers_with_unresolved_endpoint)); |
312 | ||
313 | SWAP_TWO(w->peers_with_unresolved_endpoint, w->peers_with_failed_endpoint); | |
e5719363 JT |
314 | |
315 | resolve_endpoints(netdev); | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Given the number of retries this function will return will an exponential | |
322 | * increasing time in milliseconds to wait starting at 200ms and capped at 25 seconds. | |
323 | */ | |
324 | static int exponential_backoff_milliseconds(unsigned n_retries) { | |
7232c1f9 | 325 | return (2 << MIN(n_retries, 7U)) * 100 * USEC_PER_MSEC; |
e5719363 JT |
326 | } |
327 | ||
328 | static int wireguard_resolve_handler(sd_resolve_query *q, | |
329 | int ret, | |
330 | const struct addrinfo *ai, | |
f1368a33 | 331 | WireguardPeer *peer) { |
1061dab1 | 332 | NetDev *netdev; |
e5719363 | 333 | Wireguard *w; |
e5719363 JT |
334 | int r; |
335 | ||
f1368a33 YW |
336 | assert(peer); |
337 | assert(peer->wireguard); | |
e5719363 | 338 | |
f1368a33 YW |
339 | w = peer->wireguard; |
340 | netdev = NETDEV(w); | |
e5719363 | 341 | |
9e2bbf99 | 342 | if (!netdev_is_managed(netdev)) |
8173d1d0 | 343 | return 0; |
e5719363 JT |
344 | |
345 | if (ret != 0) { | |
f1368a33 YW |
346 | log_netdev_error(netdev, "Failed to resolve host '%s:%s': %s", peer->endpoint_host, peer->endpoint_port, gai_strerror(ret)); |
347 | ||
348 | r = set_ensure_allocated(&w->peers_with_failed_endpoint, NULL); | |
349 | if (r < 0) { | |
350 | log_oom(); | |
351 | peer->section->invalid = true; | |
352 | goto resolve_next; | |
353 | } | |
354 | ||
355 | r = set_put(w->peers_with_failed_endpoint, peer); | |
356 | if (r < 0) { | |
357 | log_netdev_error(netdev, "Failed to save a peer, dropping the peer: %m"); | |
358 | peer->section->invalid = true; | |
359 | goto resolve_next; | |
360 | } | |
361 | ||
e5719363 | 362 | } else if ((ai->ai_family == AF_INET && ai->ai_addrlen == sizeof(struct sockaddr_in)) || |
8173d1d0 | 363 | (ai->ai_family == AF_INET6 && ai->ai_addrlen == sizeof(struct sockaddr_in6))) |
f1368a33 | 364 | memcpy(&peer->endpoint, ai->ai_addr, ai->ai_addrlen); |
e5719363 | 365 | else |
f1368a33 YW |
366 | log_netdev_error(netdev, "Neither IPv4 nor IPv6 address found for peer endpoint %s:%s, ignoring the address.", |
367 | peer->endpoint_host, peer->endpoint_port); | |
e5719363 | 368 | |
f1368a33 YW |
369 | resolve_next: |
370 | if (!set_isempty(w->peers_with_unresolved_endpoint)) { | |
e5719363 JT |
371 | resolve_endpoints(netdev); |
372 | return 0; | |
373 | } | |
374 | ||
e1f717d4 | 375 | (void) wireguard_set_interface(netdev); |
f1368a33 YW |
376 | |
377 | if (!set_isempty(w->peers_with_failed_endpoint)) { | |
85c987a8 | 378 | usec_t usec; |
56ba90c2 | 379 | |
e5719363 | 380 | w->n_retries++; |
85c987a8 YW |
381 | usec = usec_add(now(CLOCK_MONOTONIC), exponential_backoff_milliseconds(w->n_retries)); |
382 | r = event_reset_time(netdev->manager->event, &w->resolve_retry_event_source, | |
383 | CLOCK_MONOTONIC, usec, 0, on_resolve_retry, netdev, | |
384 | 0, "wireguard-resolve-retry", true); | |
56ba90c2 | 385 | if (r < 0) { |
e5719363 | 386 | log_netdev_warning_errno(netdev, r, "Could not arm resolve retry handler: %m"); |
56ba90c2 YW |
387 | return 0; |
388 | } | |
e5719363 JT |
389 | } |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | static void resolve_endpoints(NetDev *netdev) { | |
e5719363 JT |
395 | static const struct addrinfo hints = { |
396 | .ai_family = AF_UNSPEC, | |
397 | .ai_socktype = SOCK_DGRAM, | |
398 | .ai_protocol = IPPROTO_UDP | |
399 | }; | |
f1368a33 | 400 | WireguardPeer *peer; |
8173d1d0 | 401 | Wireguard *w; |
f1368a33 | 402 | Iterator i; |
8173d1d0 | 403 | int r = 0; |
e5719363 JT |
404 | |
405 | assert(netdev); | |
406 | w = WIREGUARD(netdev); | |
407 | assert(w); | |
408 | ||
f1368a33 | 409 | SET_FOREACH(peer, w->peers_with_unresolved_endpoint, i) { |
1061dab1 YW |
410 | r = resolve_getaddrinfo(netdev->manager->resolve, |
411 | NULL, | |
f1368a33 YW |
412 | peer->endpoint_host, |
413 | peer->endpoint_port, | |
1061dab1 YW |
414 | &hints, |
415 | wireguard_resolve_handler, | |
f1368a33 YW |
416 | wireguard_peer_destroy_callback, |
417 | peer); | |
e5719363 JT |
418 | if (r == -ENOBUFS) |
419 | break; | |
8173d1d0 YW |
420 | if (r < 0) { |
421 | log_netdev_error_errno(netdev, r, "Failed to create resolver: %m"); | |
422 | continue; | |
423 | } | |
e5719363 | 424 | |
8173d1d0 YW |
425 | /* Avoid freeing netdev. It will be unrefed by the destroy callback. */ |
426 | netdev_ref(netdev); | |
427 | ||
f1368a33 | 428 | (void) set_remove(w->peers_with_unresolved_endpoint, peer); |
e5719363 JT |
429 | } |
430 | } | |
431 | ||
e5719363 | 432 | static int netdev_wireguard_post_create(NetDev *netdev, Link *link, sd_netlink_message *m) { |
e5719363 | 433 | assert(netdev); |
10c353e1 | 434 | assert(WIREGUARD(netdev)); |
e5719363 | 435 | |
e1f717d4 | 436 | (void) wireguard_set_interface(netdev); |
e5719363 JT |
437 | resolve_endpoints(netdev); |
438 | return 0; | |
439 | } | |
440 | ||
441 | int config_parse_wireguard_listen_port(const char *unit, | |
442 | const char *filename, | |
443 | unsigned line, | |
444 | const char *section, | |
445 | unsigned section_line, | |
446 | const char *lvalue, | |
447 | int ltype, | |
448 | const char *rvalue, | |
449 | void *data, | |
450 | void *userdata) { | |
451 | uint16_t *s = data; | |
452 | uint16_t port = 0; | |
453 | int r; | |
454 | ||
455 | assert(rvalue); | |
456 | assert(data); | |
457 | ||
458 | if (!streq(rvalue, "auto")) { | |
f1368a33 YW |
459 | r = parse_ip_port(rvalue, s); |
460 | if (r < 0) { | |
461 | log_syntax(unit, LOG_ERR, filename, line, r, | |
462 | "Invalid port specification, ignoring assignment: %s", rvalue); | |
463 | return 0; | |
464 | } | |
e5719363 JT |
465 | } |
466 | ||
467 | *s = port; | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
fedcb4c3 YW |
472 | static int wireguard_decode_key_and_warn( |
473 | const char *rvalue, | |
474 | uint8_t *ret, | |
475 | const char *unit, | |
476 | const char *filename, | |
477 | unsigned line, | |
478 | const char *lvalue) { | |
e5719363 JT |
479 | _cleanup_free_ void *key = NULL; |
480 | size_t len; | |
481 | int r; | |
482 | ||
e5719363 | 483 | assert(rvalue); |
fedcb4c3 YW |
484 | assert(ret); |
485 | assert(filename); | |
486 | assert(lvalue); | |
487 | ||
488 | if (isempty(rvalue)) { | |
489 | memzero(ret, WG_KEY_LEN); | |
490 | return 0; | |
491 | } | |
e5719363 JT |
492 | |
493 | r = unbase64mem(rvalue, strlen(rvalue), &key, &len); | |
494 | if (r < 0) { | |
f1368a33 | 495 | log_syntax(unit, LOG_ERR, filename, line, r, |
583eb170 | 496 | "Failed to decode wireguard key provided by %s=, ignoring assignment: %m", lvalue); |
e5719363 JT |
497 | return 0; |
498 | } | |
499 | if (len != WG_KEY_LEN) { | |
583eb170 YW |
500 | log_syntax(unit, LOG_ERR, filename, line, 0, |
501 | "Wireguard key provided by %s= has invalid length (%zu bytes), ignoring assignment.", | |
502 | lvalue, len); | |
e5719363 JT |
503 | return 0; |
504 | } | |
505 | ||
fedcb4c3 | 506 | memcpy(ret, key, WG_KEY_LEN); |
e5719363 JT |
507 | return true; |
508 | } | |
509 | ||
510 | int config_parse_wireguard_private_key(const char *unit, | |
511 | const char *filename, | |
512 | unsigned line, | |
513 | const char *section, | |
514 | unsigned section_line, | |
515 | const char *lvalue, | |
516 | int ltype, | |
517 | const char *rvalue, | |
518 | void *data, | |
519 | void *userdata) { | |
520 | Wireguard *w; | |
521 | ||
522 | assert(data); | |
523 | ||
524 | w = WIREGUARD(data); | |
525 | ||
526 | assert(w); | |
527 | ||
fedcb4c3 | 528 | return wireguard_decode_key_and_warn(rvalue, w->private_key, unit, filename, line, lvalue); |
e5719363 JT |
529 | |
530 | } | |
531 | ||
76df7779 YW |
532 | int config_parse_wireguard_private_key_file( |
533 | const char *unit, | |
534 | const char *filename, | |
535 | unsigned line, | |
536 | const char *section, | |
537 | unsigned section_line, | |
538 | const char *lvalue, | |
539 | int ltype, | |
540 | const char *rvalue, | |
541 | void *data, | |
542 | void *userdata) { | |
543 | ||
544 | _cleanup_free_ char *path = NULL; | |
545 | Wireguard *w; | |
546 | ||
547 | assert(data); | |
548 | w = WIREGUARD(data); | |
549 | assert(w); | |
550 | ||
551 | if (isempty(rvalue)) { | |
552 | w->private_key_file = mfree(w->private_key_file); | |
553 | return 0; | |
554 | } | |
555 | ||
556 | path = strdup(rvalue); | |
557 | if (!path) | |
558 | return log_oom(); | |
559 | ||
560 | if (path_simplify_and_warn(path, PATH_CHECK_ABSOLUTE, unit, filename, line, lvalue) < 0) | |
561 | return 0; | |
562 | ||
563 | return free_and_replace(w->private_key_file, path); | |
564 | } | |
565 | ||
e5719363 JT |
566 | int config_parse_wireguard_preshared_key(const char *unit, |
567 | const char *filename, | |
568 | unsigned line, | |
569 | const char *section, | |
570 | unsigned section_line, | |
571 | const char *lvalue, | |
572 | int ltype, | |
573 | const char *rvalue, | |
574 | void *data, | |
575 | void *userdata) { | |
f1368a33 YW |
576 | |
577 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
e5719363 | 578 | Wireguard *w; |
f1368a33 | 579 | int r; |
e5719363 JT |
580 | |
581 | assert(data); | |
582 | ||
583 | w = WIREGUARD(data); | |
584 | ||
585 | assert(w); | |
586 | ||
f1368a33 YW |
587 | r = wireguard_peer_new_static(w, filename, section_line, &peer); |
588 | if (r < 0) | |
589 | return r; | |
e5719363 | 590 | |
fedcb4c3 | 591 | r = wireguard_decode_key_and_warn(rvalue, peer->preshared_key, unit, filename, line, lvalue); |
f1368a33 YW |
592 | if (r < 0) |
593 | return r; | |
594 | ||
595 | TAKE_PTR(peer); | |
596 | return 0; | |
e5719363 JT |
597 | } |
598 | ||
e5719363 JT |
599 | int config_parse_wireguard_public_key(const char *unit, |
600 | const char *filename, | |
601 | unsigned line, | |
602 | const char *section, | |
603 | unsigned section_line, | |
604 | const char *lvalue, | |
605 | int ltype, | |
606 | const char *rvalue, | |
607 | void *data, | |
608 | void *userdata) { | |
f1368a33 YW |
609 | |
610 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
e5719363 | 611 | Wireguard *w; |
f1368a33 | 612 | int r; |
e5719363 JT |
613 | |
614 | assert(data); | |
615 | ||
616 | w = WIREGUARD(data); | |
617 | ||
618 | assert(w); | |
619 | ||
f1368a33 YW |
620 | r = wireguard_peer_new_static(w, filename, section_line, &peer); |
621 | if (r < 0) | |
622 | return r; | |
623 | ||
fedcb4c3 | 624 | r = wireguard_decode_key_and_warn(rvalue, peer->public_key, unit, filename, line, lvalue); |
f1368a33 YW |
625 | if (r < 0) |
626 | return r; | |
e5719363 | 627 | |
f1368a33 YW |
628 | TAKE_PTR(peer); |
629 | return 0; | |
e5719363 JT |
630 | } |
631 | ||
632 | int config_parse_wireguard_allowed_ips(const char *unit, | |
633 | const char *filename, | |
634 | unsigned line, | |
635 | const char *section, | |
636 | unsigned section_line, | |
637 | const char *lvalue, | |
638 | int ltype, | |
639 | const char *rvalue, | |
640 | void *data, | |
641 | void *userdata) { | |
f1368a33 YW |
642 | |
643 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
e5719363 JT |
644 | union in_addr_union addr; |
645 | unsigned char prefixlen; | |
646 | int r, family; | |
647 | Wireguard *w; | |
e5719363 JT |
648 | WireguardIPmask *ipmask; |
649 | ||
650 | assert(rvalue); | |
651 | assert(data); | |
652 | ||
653 | w = WIREGUARD(data); | |
654 | ||
f1368a33 YW |
655 | assert(w); |
656 | ||
657 | r = wireguard_peer_new_static(w, filename, section_line, &peer); | |
658 | if (r < 0) | |
659 | return r; | |
e5719363 JT |
660 | |
661 | for (;;) { | |
662 | _cleanup_free_ char *word = NULL; | |
663 | ||
664 | r = extract_first_word(&rvalue, &word, "," WHITESPACE, 0); | |
665 | if (r == 0) | |
666 | break; | |
667 | if (r == -ENOMEM) | |
668 | return log_oom(); | |
669 | if (r < 0) { | |
f1368a33 YW |
670 | log_syntax(unit, LOG_ERR, filename, line, r, |
671 | "Failed to split allowed ips \"%s\" option: %m", rvalue); | |
e5719363 JT |
672 | break; |
673 | } | |
674 | ||
675 | r = in_addr_prefix_from_string_auto(word, &family, &addr, &prefixlen); | |
676 | if (r < 0) { | |
f1368a33 YW |
677 | log_syntax(unit, LOG_ERR, filename, line, r, |
678 | "Network address is invalid, ignoring assignment: %s", word); | |
679 | continue; | |
e5719363 JT |
680 | } |
681 | ||
fc721553 | 682 | ipmask = new(WireguardIPmask, 1); |
e5719363 JT |
683 | if (!ipmask) |
684 | return log_oom(); | |
fc721553 YW |
685 | |
686 | *ipmask = (WireguardIPmask) { | |
687 | .family = family, | |
688 | .ip.in6 = addr.in6, | |
689 | .cidr = prefixlen, | |
690 | }; | |
e5719363 JT |
691 | |
692 | LIST_PREPEND(ipmasks, peer->ipmasks, ipmask); | |
693 | } | |
694 | ||
f1368a33 | 695 | TAKE_PTR(peer); |
e5719363 JT |
696 | return 0; |
697 | } | |
698 | ||
699 | int config_parse_wireguard_endpoint(const char *unit, | |
700 | const char *filename, | |
701 | unsigned line, | |
702 | const char *section, | |
703 | unsigned section_line, | |
704 | const char *lvalue, | |
705 | int ltype, | |
706 | const char *rvalue, | |
707 | void *data, | |
708 | void *userdata) { | |
f1368a33 YW |
709 | |
710 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
711 | const char *begin, *end; | |
e5719363 | 712 | Wireguard *w; |
e5719363 | 713 | size_t len; |
f1368a33 | 714 | int r; |
e5719363 JT |
715 | |
716 | assert(data); | |
717 | assert(rvalue); | |
718 | ||
719 | w = WIREGUARD(data); | |
720 | ||
721 | assert(w); | |
722 | ||
f1368a33 YW |
723 | r = wireguard_peer_new_static(w, filename, section_line, &peer); |
724 | if (r < 0) | |
725 | return r; | |
e5719363 | 726 | |
e5719363 JT |
727 | if (rvalue[0] == '[') { |
728 | begin = &rvalue[1]; | |
729 | end = strchr(rvalue, ']'); | |
730 | if (!end) { | |
f1368a33 YW |
731 | log_syntax(unit, LOG_ERR, filename, line, 0, |
732 | "Unable to find matching brace of endpoint, ignoring assignment: %s", | |
733 | rvalue); | |
e5719363 JT |
734 | return 0; |
735 | } | |
736 | len = end - begin; | |
737 | ++end; | |
738 | if (*end != ':' || !*(end + 1)) { | |
f1368a33 YW |
739 | log_syntax(unit, LOG_ERR, filename, line, 0, |
740 | "Unable to find port of endpoint, ignoring assignment: %s", | |
741 | rvalue); | |
e5719363 JT |
742 | return 0; |
743 | } | |
744 | ++end; | |
745 | } else { | |
746 | begin = rvalue; | |
747 | end = strrchr(rvalue, ':'); | |
748 | if (!end || !*(end + 1)) { | |
f1368a33 YW |
749 | log_syntax(unit, LOG_ERR, filename, line, 0, |
750 | "Unable to find port of endpoint, ignoring assignment: %s", | |
751 | rvalue); | |
e5719363 JT |
752 | return 0; |
753 | } | |
754 | len = end - begin; | |
755 | ++end; | |
756 | } | |
757 | ||
5f07d640 YW |
758 | r = free_and_strndup(&peer->endpoint_host, begin, len); |
759 | if (r < 0) | |
e5719363 JT |
760 | return log_oom(); |
761 | ||
5f07d640 YW |
762 | r = free_and_strdup(&peer->endpoint_port, end); |
763 | if (r < 0) | |
e5719363 JT |
764 | return log_oom(); |
765 | ||
f1368a33 YW |
766 | r = set_ensure_allocated(&w->peers_with_unresolved_endpoint, NULL); |
767 | if (r < 0) | |
fc721553 YW |
768 | return log_oom(); |
769 | ||
f1368a33 YW |
770 | r = set_put(w->peers_with_unresolved_endpoint, peer); |
771 | if (r < 0) | |
772 | return r; | |
e5719363 | 773 | |
f1368a33 | 774 | TAKE_PTR(peer); |
e5719363 JT |
775 | return 0; |
776 | } | |
777 | ||
778 | int config_parse_wireguard_keepalive(const char *unit, | |
779 | const char *filename, | |
780 | unsigned line, | |
781 | const char *section, | |
782 | unsigned section_line, | |
783 | const char *lvalue, | |
784 | int ltype, | |
785 | const char *rvalue, | |
786 | void *data, | |
787 | void *userdata) { | |
f1368a33 YW |
788 | |
789 | _cleanup_(wireguard_peer_free_or_set_invalidp) WireguardPeer *peer = NULL; | |
e5719363 JT |
790 | uint16_t keepalive = 0; |
791 | Wireguard *w; | |
f1368a33 | 792 | int r; |
e5719363 JT |
793 | |
794 | assert(rvalue); | |
795 | assert(data); | |
796 | ||
797 | w = WIREGUARD(data); | |
798 | ||
799 | assert(w); | |
800 | ||
f1368a33 YW |
801 | r = wireguard_peer_new_static(w, filename, section_line, &peer); |
802 | if (r < 0) | |
803 | return r; | |
e5719363 JT |
804 | |
805 | if (streq(rvalue, "off")) | |
806 | keepalive = 0; | |
807 | else { | |
808 | r = safe_atou16(rvalue, &keepalive); | |
f1368a33 YW |
809 | if (r < 0) { |
810 | log_syntax(unit, LOG_ERR, filename, line, r, | |
811 | "The persistent keepalive interval must be 0-65535. Ignore assignment: %s", | |
812 | rvalue); | |
813 | return 0; | |
814 | } | |
e5719363 JT |
815 | } |
816 | ||
817 | peer->persistent_keepalive_interval = keepalive; | |
f1368a33 YW |
818 | |
819 | TAKE_PTR(peer); | |
e5719363 JT |
820 | return 0; |
821 | } | |
822 | ||
823 | static void wireguard_init(NetDev *netdev) { | |
824 | Wireguard *w; | |
825 | ||
826 | assert(netdev); | |
827 | ||
828 | w = WIREGUARD(netdev); | |
829 | ||
830 | assert(w); | |
831 | ||
832 | w->flags = WGDEVICE_F_REPLACE_PEERS; | |
833 | } | |
834 | ||
835 | static void wireguard_done(NetDev *netdev) { | |
836 | Wireguard *w; | |
e5719363 JT |
837 | |
838 | assert(netdev); | |
839 | w = WIREGUARD(netdev); | |
c195364d | 840 | assert(w); |
e5719363 | 841 | |
85c987a8 YW |
842 | sd_event_source_unref(w->resolve_retry_event_source); |
843 | ||
76df7779 YW |
844 | free(w->private_key_file); |
845 | ||
f1368a33 YW |
846 | hashmap_free_with_destructor(w->peers_by_section, wireguard_peer_free); |
847 | set_free(w->peers_with_unresolved_endpoint); | |
848 | set_free(w->peers_with_failed_endpoint); | |
849 | } | |
c195364d | 850 | |
76df7779 YW |
851 | static int wireguard_read_private_key_file(Wireguard *w, bool fatal) { |
852 | _cleanup_free_ char *contents = NULL; | |
853 | _cleanup_free_ void *key = NULL; | |
854 | size_t size, key_len; | |
855 | NetDev *netdev; | |
856 | int level, r; | |
857 | ||
858 | assert(w); | |
859 | ||
860 | netdev = NETDEV(w); | |
861 | ||
862 | if (!w->private_key_file) | |
863 | return 0; | |
864 | ||
865 | level = fatal ? LOG_ERR : LOG_INFO; | |
866 | ||
867 | r = read_full_file(w->private_key_file, &contents, &size); | |
868 | if (r < 0) | |
869 | return log_netdev_full(netdev, level, r, | |
870 | "Failed to read private key from '%s'%s: %m", | |
871 | w->private_key_file, fatal ? "" : ", ignoring"); | |
872 | ||
873 | r = unbase64mem(contents, size, &key, &key_len); | |
874 | if (r < 0) | |
875 | return log_netdev_full(netdev, level, r, | |
876 | "Failed to decode private key%s: %m", | |
877 | fatal ? "" : ", ignoring"); | |
878 | ||
879 | if (key_len != WG_KEY_LEN) | |
880 | return log_netdev_full(netdev, level, SYNTHETIC_ERRNO(EINVAL), | |
881 | "Wireguard private key has invalid length (%zu bytes)%s: %m", | |
882 | key_len, fatal ? "" : ", ignoring"); | |
883 | ||
884 | memcpy(w->private_key, key, WG_KEY_LEN); | |
885 | return 0; | |
886 | } | |
887 | ||
9cc9021a YW |
888 | static int wireguard_peer_verify(WireguardPeer *peer) { |
889 | NetDev *netdev = NETDEV(peer->wireguard); | |
890 | ||
891 | if (section_is_invalid(peer->section)) | |
892 | return -EINVAL; | |
893 | ||
894 | if (eqzero(peer->public_key)) | |
895 | return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), | |
896 | "%s: WireGuardPeer section without PublicKey= configured. " | |
897 | "Ignoring [WireGuardPeer] section from line %u.", | |
898 | peer->section->filename, peer->section->line); | |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
f1368a33 YW |
903 | static int wireguard_verify(NetDev *netdev, const char *filename) { |
904 | WireguardPeer *peer, *peer_next; | |
905 | Wireguard *w; | |
76df7779 YW |
906 | bool empty; |
907 | int r; | |
c195364d | 908 | |
f1368a33 YW |
909 | assert(netdev); |
910 | w = WIREGUARD(netdev); | |
911 | assert(w); | |
912 | ||
76df7779 YW |
913 | empty = eqzero(w->private_key); |
914 | if (empty && !w->private_key_file) | |
9cc9021a YW |
915 | return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), |
916 | "%s: Missing PrivateKey= or PrivateKeyFile=, ignoring.", | |
917 | filename); | |
918 | ||
76df7779 YW |
919 | r = wireguard_read_private_key_file(w, empty); |
920 | if (r < 0 && empty) | |
921 | return r; | |
922 | ||
f1368a33 | 923 | LIST_FOREACH_SAFE(peers, peer, peer_next, w->peers) |
9cc9021a | 924 | if (wireguard_peer_verify(peer) < 0) |
f1368a33 YW |
925 | wireguard_peer_free(peer); |
926 | ||
927 | return 0; | |
e5719363 JT |
928 | } |
929 | ||
930 | const NetDevVTable wireguard_vtable = { | |
931 | .object_size = sizeof(Wireguard), | |
932 | .sections = "Match\0NetDev\0WireGuard\0WireGuardPeer\0", | |
933 | .post_create = netdev_wireguard_post_create, | |
934 | .init = wireguard_init, | |
935 | .done = wireguard_done, | |
936 | .create_type = NETDEV_CREATE_INDEPENDENT, | |
f1368a33 | 937 | .config_verify = wireguard_verify, |
e5719363 | 938 | }; |