1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 Copyright © 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
8 #include <netinet/in.h>
9 #include <linux/if_arp.h>
10 #include <linux/ipv6_route.h>
12 #include "sd-resolve.h"
14 #include "alloc-util.h"
15 #include "creds-util.h"
16 #include "dns-domain.h"
17 #include "event-util.h"
20 #include "hexdecoct.h"
21 #include "memory-util.h"
22 #include "netlink-util.h"
23 #include "networkd-manager.h"
24 #include "networkd-route-util.h"
25 #include "networkd-route.h"
26 #include "networkd-util.h"
27 #include "parse-helpers.h"
28 #include "parse-util.h"
29 #include "path-util.h"
30 #include "random-util.h"
31 #include "resolve-private.h"
32 #include "string-util.h"
34 #include "wireguard.h"
36 static void wireguard_resolve_endpoints(NetDev
*netdev
);
37 static int peer_resolve_endpoint(WireguardPeer
*peer
);
39 static void wireguard_peer_clear_ipmasks(WireguardPeer
*peer
) {
42 LIST_CLEAR(ipmasks
, peer
->ipmasks
, free
);
45 static WireguardPeer
* wireguard_peer_free(WireguardPeer
*peer
) {
49 if (peer
->wireguard
) {
50 LIST_REMOVE(peers
, peer
->wireguard
->peers
, peer
);
53 hashmap_remove(peer
->wireguard
->peers_by_section
, peer
->section
);
56 config_section_free(peer
->section
);
58 wireguard_peer_clear_ipmasks(peer
);
60 free(peer
->endpoint_host
);
61 free(peer
->endpoint_port
);
62 free(peer
->preshared_key_file
);
63 explicit_bzero_safe(peer
->preshared_key
, WG_KEY_LEN
);
65 sd_event_source_disable_unref(peer
->resolve_retry_event_source
);
66 sd_resolve_query_unref(peer
->resolve_query
);
71 DEFINE_SECTION_CLEANUP_FUNCTIONS(WireguardPeer
, wireguard_peer_free
);
73 static int wireguard_peer_new_static(Wireguard
*w
, const char *filename
, unsigned section_line
, WireguardPeer
**ret
) {
74 _cleanup_(config_section_freep
) ConfigSection
*n
= NULL
;
75 _cleanup_(wireguard_peer_freep
) WireguardPeer
*peer
= NULL
;
81 assert(section_line
> 0);
83 r
= config_section_new(filename
, section_line
, &n
);
87 peer
= hashmap_get(w
->peers_by_section
, n
);
89 *ret
= TAKE_PTR(peer
);
93 peer
= new(WireguardPeer
, 1);
97 *peer
= (WireguardPeer
) {
98 .flags
= WGPEER_F_REPLACE_ALLOWEDIPS
,
100 .section
= TAKE_PTR(n
),
103 LIST_PREPEND(peers
, w
->peers
, peer
);
105 r
= hashmap_ensure_put(&w
->peers_by_section
, &config_section_hash_ops
, peer
->section
, peer
);
109 *ret
= TAKE_PTR(peer
);
113 static int wireguard_set_ipmask_one(NetDev
*netdev
, sd_netlink_message
*message
, const WireguardIPmask
*mask
, uint16_t index
) {
120 /* This returns 1 on success, 0 on recoverable error, and negative errno on failure. */
122 r
= sd_netlink_message_open_array(message
, index
);
126 r
= sd_netlink_message_append_u16(message
, WGALLOWEDIP_A_FAMILY
, mask
->family
);
130 r
= netlink_message_append_in_addr_union(message
, WGALLOWEDIP_A_IPADDR
, mask
->family
, &mask
->ip
);
134 r
= sd_netlink_message_append_u8(message
, WGALLOWEDIP_A_CIDR_MASK
, mask
->cidr
);
138 r
= sd_netlink_message_close_container(message
);
140 return log_netdev_error_errno(netdev
, r
, "Could not add wireguard allowed ip: %m");
145 r
= sd_netlink_message_cancel_array(message
);
147 return log_netdev_error_errno(netdev
, r
, "Could not cancel wireguard allowed ip message attribute: %m");
152 static int wireguard_set_peer_one(NetDev
*netdev
, sd_netlink_message
*message
, const WireguardPeer
*peer
, uint16_t index
, WireguardIPmask
**mask_start
) {
153 WireguardIPmask
*start
, *last
= NULL
;
162 /* This returns 1 on success, 0 on recoverable error, and negative errno on failure. */
164 start
= *mask_start
?: peer
->ipmasks
;
166 r
= sd_netlink_message_open_array(message
, index
);
170 r
= sd_netlink_message_append_data(message
, WGPEER_A_PUBLIC_KEY
, &peer
->public_key
, sizeof(peer
->public_key
));
175 r
= sd_netlink_message_append_data(message
, WGPEER_A_PRESHARED_KEY
, &peer
->preshared_key
, WG_KEY_LEN
);
179 r
= sd_netlink_message_append_u32(message
, WGPEER_A_FLAGS
, peer
->flags
);
183 r
= sd_netlink_message_append_u16(message
, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL
, peer
->persistent_keepalive_interval
);
187 if (IN_SET(peer
->endpoint
.sa
.sa_family
, AF_INET
, AF_INET6
)) {
188 r
= netlink_message_append_sockaddr_union(message
, WGPEER_A_ENDPOINT
, &peer
->endpoint
);
194 r
= sd_netlink_message_open_container(message
, WGPEER_A_ALLOWEDIPS
);
198 LIST_FOREACH(ipmasks
, mask
, start
) {
199 r
= wireguard_set_ipmask_one(netdev
, message
, mask
, ++j
);
208 r
= sd_netlink_message_close_container(message
);
210 return log_netdev_error_errno(netdev
, r
, "Could not add wireguard allowed ip: %m");
212 r
= sd_netlink_message_close_container(message
);
214 return log_netdev_error_errno(netdev
, r
, "Could not add wireguard peer: %m");
216 *mask_start
= last
; /* Start next cycle from this mask. */
220 r
= sd_netlink_message_cancel_array(message
);
222 return log_netdev_error_errno(netdev
, r
, "Could not cancel wireguard peers: %m");
227 static int wireguard_set_interface(NetDev
*netdev
) {
228 _cleanup_(sd_netlink_message_unrefp
) sd_netlink_message
*message
= NULL
;
229 WireguardIPmask
*mask_start
= NULL
;
230 bool sent_once
= false;
232 Wireguard
*w
= WIREGUARD(netdev
);
235 for (WireguardPeer
*peer_start
= w
->peers
; peer_start
|| !sent_once
; ) {
238 message
= sd_netlink_message_unref(message
);
240 r
= sd_genl_message_new(netdev
->manager
->genl
, WG_GENL_NAME
, WG_CMD_SET_DEVICE
, &message
);
242 return log_netdev_error_errno(netdev
, r
, "Failed to allocate generic netlink message: %m");
244 r
= sd_netlink_message_append_string(message
, WGDEVICE_A_IFNAME
, netdev
->ifname
);
246 return log_netdev_error_errno(netdev
, r
, "Could not append wireguard interface name: %m");
248 if (peer_start
== w
->peers
) {
249 r
= sd_netlink_message_append_data(message
, WGDEVICE_A_PRIVATE_KEY
, &w
->private_key
, WG_KEY_LEN
);
251 return log_netdev_error_errno(netdev
, r
, "Could not append wireguard private key: %m");
253 r
= sd_netlink_message_append_u16(message
, WGDEVICE_A_LISTEN_PORT
, w
->port
);
255 return log_netdev_error_errno(netdev
, r
, "Could not append wireguard port: %m");
257 r
= sd_netlink_message_append_u32(message
, WGDEVICE_A_FWMARK
, w
->fwmark
);
259 return log_netdev_error_errno(netdev
, r
, "Could not append wireguard fwmark: %m");
261 r
= sd_netlink_message_append_u32(message
, WGDEVICE_A_FLAGS
, w
->flags
);
263 return log_netdev_error_errno(netdev
, r
, "Could not append wireguard flags: %m");
266 r
= sd_netlink_message_open_container(message
, WGDEVICE_A_PEERS
);
268 return log_netdev_error_errno(netdev
, r
, "Could not append wireguard peer attributes: %m");
270 WireguardPeer
*peer_last
= NULL
;
271 LIST_FOREACH(peers
, peer
, peer_start
) {
272 r
= wireguard_set_peer_one(netdev
, message
, peer
, ++i
, &mask_start
);
280 peer_start
= peer_last
; /* Start next cycle from this peer. */
282 r
= sd_netlink_message_close_container(message
);
284 return log_netdev_error_errno(netdev
, r
, "Could not close wireguard container: %m");
286 r
= sd_netlink_send(netdev
->manager
->genl
, message
, &serial
);
288 return log_netdev_error_errno(netdev
, r
, "Could not set wireguard device: %m");
296 static int on_resolve_retry(sd_event_source
*s
, usec_t usec
, void *userdata
) {
297 WireguardPeer
*peer
= ASSERT_PTR(userdata
);
300 assert(peer
->wireguard
);
302 netdev
= NETDEV(peer
->wireguard
);
304 if (!netdev_is_managed(netdev
))
307 peer
->resolve_query
= sd_resolve_query_unref(peer
->resolve_query
);
309 (void) peer_resolve_endpoint(peer
);
313 static usec_t
peer_next_resolve_usec(WireguardPeer
*peer
) {
316 /* Given the number of retries this function will return an exponential increasing amount of
317 * milliseconds to wait starting at 200ms and capped at 25 seconds. */
321 usec
= (2 << MIN(peer
->n_retries
, 7U)) * 100 * USEC_PER_MSEC
;
323 return random_u64_range(usec
/ 10) + usec
* 9 / 10;
326 static int wireguard_peer_resolve_handler(
329 const struct addrinfo
*ai
,
332 WireguardPeer
*peer
= ASSERT_PTR(userdata
);
336 assert(peer
->wireguard
);
338 netdev
= NETDEV(peer
->wireguard
);
340 if (!netdev_is_managed(netdev
))
344 log_netdev_warning(netdev
, "Failed to resolve host '%s:%s', ignoring: %s",
345 peer
->endpoint_host
, peer
->endpoint_port
, gai_strerror(ret
));
350 for (; ai
; ai
= ai
->ai_next
) {
351 if (!IN_SET(ai
->ai_family
, AF_INET
, AF_INET6
))
354 if (ai
->ai_addrlen
!= (ai
->ai_family
== AF_INET
? sizeof(struct sockaddr_in
) : sizeof(struct sockaddr_in6
)))
357 memcpy(&peer
->endpoint
, ai
->ai_addr
, ai
->ai_addrlen
);
358 (void) wireguard_set_interface(netdev
);
365 log_netdev_warning(netdev
, "Neither IPv4 nor IPv6 address found for peer endpoint %s:%s, ignoring the endpoint.",
366 peer
->endpoint_host
, peer
->endpoint_port
);
371 if (peer
->n_retries
> 0) {
372 r
= event_reset_time_relative(netdev
->manager
->event
,
373 &peer
->resolve_retry_event_source
,
375 peer_next_resolve_usec(peer
), 0,
376 on_resolve_retry
, peer
, 0, "wireguard-resolve-retry", true);
378 log_netdev_warning_errno(netdev
, r
, "Could not arm resolve retry handler for endpoint %s:%s, ignoring: %m",
379 peer
->endpoint_host
, peer
->endpoint_port
);
382 wireguard_resolve_endpoints(netdev
);
386 static int peer_resolve_endpoint(WireguardPeer
*peer
) {
387 static const struct addrinfo hints
= {
388 .ai_family
= AF_UNSPEC
,
389 .ai_socktype
= SOCK_DGRAM
,
390 .ai_protocol
= IPPROTO_UDP
396 assert(peer
->wireguard
);
398 netdev
= NETDEV(peer
->wireguard
);
400 if (!peer
->endpoint_host
|| !peer
->endpoint_port
)
401 /* Not necessary to resolve the endpoint. */
404 if (sd_event_source_get_enabled(peer
->resolve_retry_event_source
, NULL
) > 0)
405 /* Timer event source is enabled. The endpoint will be resolved later. */
408 if (peer
->resolve_query
)
409 /* Being resolved, or already resolved. */
412 r
= sd_resolve_getaddrinfo(netdev
->manager
->resolve
,
413 &peer
->resolve_query
,
417 wireguard_peer_resolve_handler
,
420 return log_netdev_full_errno(netdev
, r
== -ENOBUFS
? LOG_DEBUG
: LOG_WARNING
, r
,
421 "Failed to create endpoint resolver for %s:%s, ignoring: %m",
422 peer
->endpoint_host
, peer
->endpoint_port
);
427 static void wireguard_resolve_endpoints(NetDev
*netdev
) {
428 Wireguard
*w
= WIREGUARD(netdev
);
430 LIST_FOREACH(peers
, peer
, w
->peers
)
431 if (peer_resolve_endpoint(peer
) == -ENOBUFS
)
432 /* Too many requests. Let's resolve remaining endpoints later. */
436 static int netdev_wireguard_post_create(NetDev
*netdev
, Link
*link
) {
437 assert(WIREGUARD(netdev
));
439 (void) wireguard_set_interface(netdev
);
440 wireguard_resolve_endpoints(netdev
);
444 int config_parse_wireguard_listen_port(
446 const char *filename
,
449 unsigned section_line
,
456 uint16_t *s
= ASSERT_PTR(data
);
461 if (isempty(rvalue
) || streq(rvalue
, "auto")) {
466 r
= parse_ip_port(rvalue
, s
);
468 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
469 "Invalid port specification, ignoring assignment: %s", rvalue
);
476 static int wireguard_decode_key_and_warn(
478 uint8_t ret
[static WG_KEY_LEN
],
480 const char *filename
,
482 const char *lvalue
) {
484 _cleanup_(erase_and_freep
) void *key
= NULL
;
485 _cleanup_(erase_and_freep
) char *cred
= NULL
;
486 const char *cred_name
;
495 if (isempty(rvalue
)) {
496 memzero(ret
, WG_KEY_LEN
);
500 cred_name
= startswith(rvalue
, "@");
502 r
= read_credential(cred_name
, (void**) &cred
, /* ret_size = */ NULL
);
506 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
507 "Failed to read credential for wireguard key (%s=), ignoring assignment: %m",
512 } else if (!streq(lvalue
, "PublicKey"))
513 (void) warn_file_is_world_accessible(filename
, NULL
, unit
, line
);
515 r
= unbase64mem_full(cred
?: rvalue
, SIZE_MAX
, /* secure = */ true, &key
, &len
);
519 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
520 "Failed to decode wireguard key provided by %s=, ignoring assignment: %m", lvalue
);
523 if (len
!= WG_KEY_LEN
) {
524 log_syntax(unit
, LOG_WARNING
, filename
, line
, 0,
525 "Wireguard key provided by %s= has invalid length (%zu bytes), ignoring assignment.",
530 memcpy(ret
, key
, WG_KEY_LEN
);
534 int config_parse_wireguard_private_key(
536 const char *filename
,
539 unsigned section_line
,
546 Wireguard
*w
= WIREGUARD(data
);
548 return wireguard_decode_key_and_warn(rvalue
, w
->private_key
, unit
, filename
, line
, lvalue
);
551 int config_parse_wireguard_private_key_file(
553 const char *filename
,
556 unsigned section_line
,
563 Wireguard
*w
= WIREGUARD(data
);
564 _cleanup_free_
char *path
= NULL
;
566 if (isempty(rvalue
)) {
567 w
->private_key_file
= mfree(w
->private_key_file
);
571 path
= strdup(rvalue
);
575 if (path_simplify_and_warn(path
, PATH_CHECK_ABSOLUTE
, unit
, filename
, line
, lvalue
) < 0)
578 return free_and_replace(w
->private_key_file
, path
);
581 int config_parse_wireguard_peer_key(
583 const char *filename
,
586 unsigned section_line
,
593 Wireguard
*w
= WIREGUARD(data
);
594 _cleanup_(wireguard_peer_free_or_set_invalidp
) WireguardPeer
*peer
= NULL
;
597 r
= wireguard_peer_new_static(w
, filename
, section_line
, &peer
);
601 r
= wireguard_decode_key_and_warn(rvalue
,
602 streq(lvalue
, "PublicKey") ? peer
->public_key
: peer
->preshared_key
,
603 unit
, filename
, line
, lvalue
);
611 int config_parse_wireguard_preshared_key_file(
613 const char *filename
,
616 unsigned section_line
,
623 Wireguard
*w
= WIREGUARD(data
);
624 _cleanup_(wireguard_peer_free_or_set_invalidp
) WireguardPeer
*peer
= NULL
;
625 _cleanup_free_
char *path
= NULL
;
628 r
= wireguard_peer_new_static(w
, filename
, section_line
, &peer
);
632 if (isempty(rvalue
)) {
633 peer
->preshared_key_file
= mfree(peer
->preshared_key_file
);
638 path
= strdup(rvalue
);
642 if (path_simplify_and_warn(path
, PATH_CHECK_ABSOLUTE
, unit
, filename
, line
, lvalue
) < 0)
645 free_and_replace(peer
->preshared_key_file
, path
);
650 int config_parse_wireguard_allowed_ips(
652 const char *filename
,
655 unsigned section_line
,
664 Wireguard
*w
= WIREGUARD(data
);
665 _cleanup_(wireguard_peer_free_or_set_invalidp
) WireguardPeer
*peer
= NULL
;
666 union in_addr_union addr
;
667 unsigned char prefixlen
;
669 WireguardIPmask
*ipmask
;
671 r
= wireguard_peer_new_static(w
, filename
, section_line
, &peer
);
675 if (isempty(rvalue
)) {
676 wireguard_peer_clear_ipmasks(peer
);
681 for (const char *p
= rvalue
;;) {
682 _cleanup_free_
char *word
= NULL
;
683 union in_addr_union masked
;
685 r
= extract_first_word(&p
, &word
, "," WHITESPACE
, 0);
691 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
692 "Failed to split allowed ips \"%s\" option: %m", rvalue
);
696 r
= in_addr_prefix_from_string_auto(word
, &family
, &addr
, &prefixlen
);
698 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
699 "Network address is invalid, ignoring assignment: %s", word
);
704 assert_se(in_addr_mask(family
, &masked
, prefixlen
) >= 0);
705 if (!in_addr_equal(family
, &masked
, &addr
))
706 log_syntax(unit
, LOG_WARNING
, filename
, line
, 0,
707 "Specified address '%s' is not properly masked, assuming '%s'.",
709 IN_ADDR_PREFIX_TO_STRING(family
, &masked
, prefixlen
));
711 ipmask
= new(WireguardIPmask
, 1);
715 *ipmask
= (WireguardIPmask
) {
721 LIST_PREPEND(ipmasks
, peer
->ipmasks
, ipmask
);
728 int config_parse_wireguard_endpoint(
730 const char *filename
,
733 unsigned section_line
,
740 Wireguard
*w
= WIREGUARD(userdata
);
741 _cleanup_(wireguard_peer_free_or_set_invalidp
) WireguardPeer
*peer
= NULL
;
742 _cleanup_free_
char *cred
= NULL
;
743 const char *cred_name
, *endpoint
;
750 r
= wireguard_peer_new_static(w
, filename
, section_line
, &peer
);
754 cred_name
= startswith(rvalue
, "@");
756 r
= read_credential(cred_name
, (void**) &cred
, /* ret_size = */ NULL
);
760 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
761 "Failed to read credential for wireguard endpoint, ignoring assignment: %m");
765 endpoint
= strstrip(cred
);
769 union in_addr_union addr
;
772 r
= in_addr_port_ifindex_name_from_string_auto(endpoint
, &family
, &addr
, &port
, NULL
, NULL
);
774 if (family
== AF_INET
)
775 peer
->endpoint
.in
= (struct sockaddr_in
) {
776 .sin_family
= AF_INET
,
778 .sin_port
= htobe16(port
),
780 else if (family
== AF_INET6
)
781 peer
->endpoint
.in6
= (struct sockaddr_in6
) {
782 .sin6_family
= AF_INET6
,
783 .sin6_addr
= addr
.in6
,
784 .sin6_port
= htobe16(port
),
787 assert_not_reached();
789 peer
->endpoint_host
= mfree(peer
->endpoint_host
);
790 peer
->endpoint_port
= mfree(peer
->endpoint_port
);
796 _cleanup_free_
char *host
= NULL
;
799 p
= strrchr(endpoint
, ':');
801 log_syntax(unit
, LOG_WARNING
, filename
, line
, 0,
802 "Unable to find port of endpoint, ignoring assignment: %s",
803 rvalue
); /* We log the original assignment instead of resolved credential here,
804 as the latter might be previously encrypted and we'd expose them in
805 unprotected logs otherwise. */
809 host
= strndup(endpoint
, p
- endpoint
);
814 if (!dns_name_is_valid(host
)) {
815 log_syntax(unit
, LOG_WARNING
, filename
, line
, 0,
816 "Invalid domain name of endpoint, ignoring assignment: %s",
821 r
= parse_ip_port(p
, &port
);
823 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
824 "Invalid port of endpoint, ignoring assignment: %s",
829 peer
->endpoint
= (union sockaddr_union
) {};
831 free_and_replace(peer
->endpoint_host
, host
);
833 r
= free_and_strdup(&peer
->endpoint_port
, p
);
837 TAKE_PTR(peer
); /* The peer may already have been in the hash map, that is fine too. */
841 int config_parse_wireguard_keepalive(
843 const char *filename
,
846 unsigned section_line
,
855 Wireguard
*w
= WIREGUARD(data
);
856 _cleanup_(wireguard_peer_free_or_set_invalidp
) WireguardPeer
*peer
= NULL
;
857 uint16_t keepalive
= 0;
860 r
= wireguard_peer_new_static(w
, filename
, section_line
, &peer
);
864 if (streq(rvalue
, "off"))
867 r
= safe_atou16(rvalue
, &keepalive
);
869 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
870 "Failed to parse \"%s\" as keepalive interval (range 0–65535), ignoring assignment: %m",
876 peer
->persistent_keepalive_interval
= keepalive
;
882 int config_parse_wireguard_route_table(
884 const char *filename
,
887 unsigned section_line
,
894 NetDev
*netdev
= ASSERT_PTR(userdata
);
895 uint32_t *table
= ASSERT_PTR(data
);
902 if (isempty(rvalue
) || parse_boolean(rvalue
) == 0) {
903 *table
= 0; /* Disabled. */
907 r
= manager_get_route_table_from_string(netdev
->manager
, rvalue
, table
);
909 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
910 "Failed to parse %s=, ignoring assignment: %s",
918 int config_parse_wireguard_peer_route_table(
920 const char *filename
,
923 unsigned section_line
,
930 Wireguard
*w
= WIREGUARD(userdata
);
931 _cleanup_(wireguard_peer_free_or_set_invalidp
) WireguardPeer
*peer
= NULL
;
937 assert(NETDEV(w
)->manager
);
939 r
= wireguard_peer_new_static(w
, filename
, section_line
, &peer
);
943 if (isempty(rvalue
)) {
944 peer
->route_table_set
= false; /* Use the table specified in [WireGuard] section. */
949 if (parse_boolean(rvalue
) == 0) {
950 peer
->route_table
= 0; /* Disabled. */
951 peer
->route_table_set
= true;
956 r
= manager_get_route_table_from_string(NETDEV(w
)->manager
, rvalue
, &peer
->route_table
);
958 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
959 "Failed to parse %s=, ignoring assignment: %s",
964 peer
->route_table_set
= true;
969 int config_parse_wireguard_route_priority(
971 const char *filename
,
974 unsigned section_line
,
981 uint32_t *priority
= ASSERT_PTR(data
);
988 if (isempty(rvalue
)) {
993 r
= safe_atou32(rvalue
, priority
);
995 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
996 "Could not parse route priority \"%s\", ignoring assignment: %m", rvalue
);
1003 int config_parse_wireguard_peer_route_priority(
1005 const char *filename
,
1007 const char *section
,
1008 unsigned section_line
,
1015 _cleanup_(wireguard_peer_free_or_set_invalidp
) WireguardPeer
*peer
= NULL
;
1024 w
= WIREGUARD(userdata
);
1027 r
= wireguard_peer_new_static(w
, filename
, section_line
, &peer
);
1031 if (isempty(rvalue
)) {
1032 peer
->route_priority_set
= false; /* Use the priority specified in [WireGuard] section. */
1037 r
= safe_atou32(rvalue
, &peer
->route_priority
);
1039 log_syntax(unit
, LOG_WARNING
, filename
, line
, r
,
1040 "Could not parse route priority \"%s\", ignoring assignment: %m", rvalue
);
1044 peer
->route_priority_set
= true;
1049 static void wireguard_init(NetDev
*netdev
) {
1050 Wireguard
*w
= WIREGUARD(netdev
);
1052 w
->flags
= WGDEVICE_F_REPLACE_PEERS
;
1055 static void wireguard_done(NetDev
*netdev
) {
1056 Wireguard
*w
= WIREGUARD(netdev
);
1058 explicit_bzero_safe(w
->private_key
, WG_KEY_LEN
);
1059 free(w
->private_key_file
);
1061 hashmap_free_with_destructor(w
->peers_by_section
, wireguard_peer_free
);
1063 set_free(w
->routes
);
1066 static int wireguard_read_key_file(const char *filename
, uint8_t dest
[static WG_KEY_LEN
]) {
1067 _cleanup_(erase_and_freep
) char *key
= NULL
;
1076 r
= read_full_file_full(
1077 AT_FDCWD
, filename
, UINT64_MAX
, WG_KEY_LEN
,
1078 READ_FULL_FILE_SECURE
|
1079 READ_FULL_FILE_UNBASE64
|
1080 READ_FULL_FILE_WARN_WORLD_READABLE
|
1081 READ_FULL_FILE_CONNECT_SOCKET
|
1082 READ_FULL_FILE_FAIL_WHEN_LARGER
,
1083 NULL
, &key
, &key_len
);
1087 if (key_len
!= WG_KEY_LEN
)
1090 memcpy(dest
, key
, WG_KEY_LEN
);
1094 static int wireguard_peer_verify(WireguardPeer
*peer
) {
1095 NetDev
*netdev
= NETDEV(peer
->wireguard
);
1098 if (section_is_invalid(peer
->section
))
1101 if (eqzero(peer
->public_key
))
1102 return log_netdev_error_errno(netdev
, SYNTHETIC_ERRNO(EINVAL
),
1103 "%s: WireGuardPeer section without PublicKey= configured. "
1104 "Ignoring [WireGuardPeer] section from line %u.",
1105 peer
->section
->filename
, peer
->section
->line
);
1107 r
= wireguard_read_key_file(peer
->preshared_key_file
, peer
->preshared_key
);
1109 return log_netdev_error_errno(netdev
, r
,
1110 "%s: Failed to read preshared key from '%s'. "
1111 "Ignoring [WireGuardPeer] section from line %u.",
1112 peer
->section
->filename
, peer
->preshared_key_file
,
1113 peer
->section
->line
);
1118 static int wireguard_read_default_key_cred(NetDev
*netdev
, const char *filename
) {
1119 Wireguard
*w
= WIREGUARD(netdev
);
1120 _cleanup_free_
char *config_name
= NULL
;
1125 r
= path_extract_filename(filename
, &config_name
);
1127 return log_netdev_error_errno(netdev
, r
,
1128 "%s: Failed to extract config name, ignoring network device: %m",
1131 char *p
= endswith(config_name
, ".netdev");
1133 /* Fuzzer run? Then we just ignore this device. */
1134 return log_netdev_error_errno(netdev
, SYNTHETIC_ERRNO(EINVAL
),
1135 "%s: Invalid netdev config name, refusing default key lookup.",
1139 _cleanup_(erase_and_freep
) char *cred
= NULL
;
1141 r
= read_credential(strjoina("network.wireguard.private.", config_name
), (void**) &cred
, /* ret_size = */ NULL
);
1143 return log_netdev_error_errno(netdev
, r
,
1144 "%s: No private key specified and default key isn't available, "
1145 "ignoring network device: %m",
1148 _cleanup_(erase_and_freep
) void *key
= NULL
;
1151 r
= unbase64mem_full(cred
, SIZE_MAX
, /* secure = */ true, &key
, &len
);
1153 return log_netdev_error_errno(netdev
, r
,
1154 "%s: No private key specified and default key cannot be parsed, "
1155 "ignoring network device: %m",
1157 if (len
!= WG_KEY_LEN
)
1158 return log_netdev_error_errno(netdev
, SYNTHETIC_ERRNO(EINVAL
),
1159 "%s: No private key specified and default key is invalid. "
1160 "Ignoring network device.",
1163 memcpy(w
->private_key
, key
, WG_KEY_LEN
);
1167 static int wireguard_verify(NetDev
*netdev
, const char *filename
) {
1168 Wireguard
*w
= WIREGUARD(netdev
);
1171 r
= wireguard_read_key_file(w
->private_key_file
, w
->private_key
);
1173 return log_netdev_error_errno(netdev
, r
,
1174 "Failed to read private key from %s. Ignoring network device.",
1175 w
->private_key_file
);
1177 if (eqzero(w
->private_key
)) {
1178 r
= wireguard_read_default_key_cred(netdev
, filename
);
1183 LIST_FOREACH(peers
, peer
, w
->peers
) {
1184 if (wireguard_peer_verify(peer
) < 0) {
1185 wireguard_peer_free(peer
);
1189 if ((peer
->route_table_set
? peer
->route_table
: w
->route_table
) == 0)
1192 LIST_FOREACH(ipmasks
, ipmask
, peer
->ipmasks
) {
1193 _cleanup_(route_freep
) Route
*route
= NULL
;
1195 r
= route_new(&route
);
1199 /* For route_section_verify() below. */
1200 r
= config_section_new(peer
->section
->filename
, peer
->section
->line
, &route
->section
);
1204 route
->source
= NETWORK_CONFIG_SOURCE_STATIC
;
1205 route
->family
= ipmask
->family
;
1206 route
->dst
= ipmask
->ip
;
1207 route
->dst_prefixlen
= ipmask
->cidr
;
1208 route
->protocol
= RTPROT_STATIC
;
1209 route
->protocol_set
= true;
1210 route
->table
= peer
->route_table_set
? peer
->route_table
: w
->route_table
;
1211 route
->table_set
= true;
1212 route
->priority
= peer
->route_priority_set
? peer
->route_priority
: w
->route_priority
;
1213 route
->priority_set
= true;
1215 if (route_section_verify(route
) < 0)
1218 r
= set_ensure_put(&w
->routes
, &route_hash_ops
, route
);
1224 route
->wireguard
= w
;
1232 const NetDevVTable wireguard_vtable
= {
1233 .object_size
= sizeof(Wireguard
),
1234 .sections
= NETDEV_COMMON_SECTIONS
"WireGuard\0WireGuardPeer\0",
1235 .post_create
= netdev_wireguard_post_create
,
1236 .init
= wireguard_init
,
1237 .done
= wireguard_done
,
1238 .create_type
= NETDEV_CREATE_INDEPENDENT
,
1239 .config_verify
= wireguard_verify
,
1240 .iftype
= ARPHRD_NONE
,