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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 00:53:35 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 00:53:35 +0000
commit69c6a41ffb878ef98c9378ed4b1634a404cfaa7f (patch)
treeb2a4f704565d62fbb129ab9dc3b35977c50e6e7f /src/libknot/cookies.c
parentInitial commit. (diff)
downloadknot-69c6a41ffb878ef98c9378ed4b1634a404cfaa7f.tar.xz
knot-69c6a41ffb878ef98c9378ed4b1634a404cfaa7f.zip
Adding upstream version 2.7.6.upstream/2.7.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libknot/cookies.c')
-rw-r--r--src/libknot/cookies.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/src/libknot/cookies.c b/src/libknot/cookies.c
new file mode 100644
index 0000000..dd024d5
--- /dev/null
+++ b/src/libknot/cookies.c
@@ -0,0 +1,130 @@
+/* Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+
+#include "libknot/attribute.h"
+#include "libknot/cookies.h"
+#include "libknot/errcode.h"
+#include "contrib/string.h"
+#include "contrib/sockaddr.h"
+#include "contrib/openbsd/siphash.h"
+
+_public_
+int knot_edns_cookie_client_generate(knot_edns_cookie_t *out,
+ const knot_edns_cookie_params_t *params)
+{
+ if (out == NULL || params == NULL || params->client_addr == NULL ||
+ params->server_addr == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ SIPHASH_CTX ctx;
+ assert(sizeof(params->secret) == sizeof(SIPHASH_KEY));
+ SipHash24_Init(&ctx, (const SIPHASH_KEY *)params->secret);
+
+ size_t addr_len = 0;
+ void *addr = sockaddr_raw(params->client_addr, &addr_len);
+ SipHash24_Update(&ctx, addr, addr_len);
+
+ addr_len = 0;
+ addr = sockaddr_raw(params->server_addr, &addr_len);
+ SipHash24_Update(&ctx, addr, addr_len);
+
+ uint64_t hash = SipHash24_End(&ctx);
+ memcpy(out->data, &hash, sizeof(hash));
+ out->len = sizeof(hash);
+
+ return KNOT_EOK;
+}
+
+_public_
+int knot_edns_cookie_client_check(const knot_edns_cookie_t *cc,
+ const knot_edns_cookie_params_t *params)
+{
+ if (cc == NULL || cc->len != KNOT_EDNS_COOKIE_CLNT_SIZE) {
+ return KNOT_EINVAL;
+ }
+
+ knot_edns_cookie_t ref;
+ int ret = knot_edns_cookie_client_generate(&ref, params);
+ if (ret != KNOT_EOK) {
+ return ret;
+ }
+ assert(ref.len == KNOT_EDNS_COOKIE_CLNT_SIZE);
+
+ ret = const_time_memcmp(cc->data, ref.data, KNOT_EDNS_COOKIE_CLNT_SIZE);
+ if (ret != 0) {
+ return KNOT_EINVAL;
+ }
+
+ return KNOT_EOK;
+}
+
+_public_
+int knot_edns_cookie_server_generate(knot_edns_cookie_t *out,
+ const knot_edns_cookie_t *cc,
+ const knot_edns_cookie_params_t *params)
+{
+ if (out == NULL || cc == NULL || cc->len != KNOT_EDNS_COOKIE_CLNT_SIZE ||
+ params == NULL || params->client_addr == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ SIPHASH_CTX ctx;
+ assert(sizeof(params->secret) == sizeof(SIPHASH_KEY));
+ SipHash24_Init(&ctx, (const SIPHASH_KEY *)params->secret);
+
+ size_t addr_len = 0;
+ void *addr = sockaddr_raw(params->client_addr, &addr_len);
+ SipHash24_Update(&ctx, addr, addr_len);
+
+ SipHash24_Update(&ctx, cc->data, cc->len);
+
+ uint64_t hash = SipHash24_End(&ctx);
+ memcpy(out->data, &hash, sizeof(hash));
+ out->len = sizeof(hash);
+
+ return KNOT_EOK;
+}
+
+_public_
+int knot_edns_cookie_server_check(const knot_edns_cookie_t *sc,
+ const knot_edns_cookie_t *cc,
+ const knot_edns_cookie_params_t *params)
+{
+ if (sc == NULL || cc == NULL || params == NULL) {
+ return KNOT_EINVAL;
+ }
+
+ knot_edns_cookie_t ref;
+ int ret = knot_edns_cookie_server_generate(&ref, cc, params);
+ if (ret != KNOT_EOK) {
+ return ret;
+ }
+
+ if (sc->len != ref.len) {
+ return KNOT_EINVAL;
+ }
+
+ ret = const_time_memcmp(sc->data, ref.data, sc->len);
+ if (ret != 0) {
+ return KNOT_EINVAL;
+ }
+
+ return KNOT_EOK;
+}