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-rw-r--r--modules/md/md_jws.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/modules/md/md_jws.c b/modules/md/md_jws.c
new file mode 100644
index 0000000..c0e8c1b
--- /dev/null
+++ b/modules/md/md_jws.c
@@ -0,0 +1,148 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <apr_lib.h>
+#include <apr_strings.h>
+#include <apr_tables.h>
+#include <apr_buckets.h>
+
+#include "md_crypt.h"
+#include "md_json.h"
+#include "md_jws.h"
+#include "md_log.h"
+#include "md_util.h"
+
+apr_status_t md_jws_get_jwk(md_json_t **pjwk, apr_pool_t *p, struct md_pkey_t *pkey)
+{
+ md_json_t *jwk;
+
+ if (!pkey) return APR_EINVAL;
+
+ jwk = md_json_create(p);
+ md_json_sets(md_pkey_get_rsa_e64(pkey, p), jwk, "e", NULL);
+ md_json_sets("RSA", jwk, "kty", NULL);
+ md_json_sets(md_pkey_get_rsa_n64(pkey, p), jwk, "n", NULL);
+ *pjwk = jwk;
+ return APR_SUCCESS;
+}
+
+apr_status_t md_jws_sign(md_json_t **pmsg, apr_pool_t *p,
+ md_data_t *payload, md_json_t *prot_fields,
+ struct md_pkey_t *pkey, const char *key_id)
+{
+ md_json_t *msg, *jprotected, *jwk;
+ const char *prot64, *pay64, *sign64, *sign, *prot;
+ md_data_t data;
+ apr_status_t rv;
+
+ msg = md_json_create(p);
+ jprotected = md_json_clone(p, prot_fields);
+ md_json_sets("RS256", jprotected, "alg", NULL);
+ if (key_id) {
+ md_json_sets(key_id, jprotected, "kid", NULL);
+ }
+ else {
+ rv = md_jws_get_jwk(&jwk, p, pkey);
+ if (APR_SUCCESS != rv) {
+ md_log_perror(MD_LOG_MARK, MD_LOG_WARNING, rv, p, "get jwk");
+ goto cleanup;
+ }
+ md_json_setj(jwk, jprotected, "jwk", NULL);
+ }
+
+ prot = md_json_writep(jprotected, p, MD_JSON_FMT_COMPACT);
+ if (!prot) {
+ rv = APR_EINVAL;
+ md_log_perror(MD_LOG_MARK, MD_LOG_WARNING, rv, p, "serialize protected");
+ goto cleanup;
+ }
+
+ md_data_init(&data, prot, strlen(prot));
+ prot64 = md_util_base64url_encode(&data, p);
+ md_json_sets(prot64, msg, "protected", NULL);
+
+ pay64 = md_util_base64url_encode(payload, p);
+ md_json_sets(pay64, msg, "payload", NULL);
+ sign = apr_psprintf(p, "%s.%s", prot64, pay64);
+
+ rv = md_crypt_sign64(&sign64, pkey, p, sign, strlen(sign));
+ if (APR_SUCCESS != rv) {
+ md_log_perror(MD_LOG_MARK, MD_LOG_WARNING, rv, p, "jwk signed message");
+ goto cleanup;
+ }
+ md_json_sets(sign64, msg, "signature", NULL);
+
+cleanup:
+ *pmsg = (APR_SUCCESS == rv)? msg : NULL;
+ return rv;
+}
+
+apr_status_t md_jws_pkey_thumb(const char **pthumb, apr_pool_t *p, struct md_pkey_t *pkey)
+{
+ const char *e64, *n64, *s;
+ md_data_t data;
+ apr_status_t rv;
+
+ e64 = md_pkey_get_rsa_e64(pkey, p);
+ n64 = md_pkey_get_rsa_n64(pkey, p);
+ if (!e64 || !n64) {
+ return APR_EINVAL;
+ }
+
+ /* whitespace and order is relevant, since we hand out a digest of this */
+ s = apr_psprintf(p, "{\"e\":\"%s\",\"kty\":\"RSA\",\"n\":\"%s\"}", e64, n64);
+ md_data_init_str(&data, s);
+ rv = md_crypt_sha256_digest64(pthumb, p, &data);
+ return rv;
+}
+
+apr_status_t md_jws_hmac(md_json_t **pmsg, apr_pool_t *p,
+ md_data_t *payload, md_json_t *prot_fields,
+ const md_data_t *hmac_key)
+{
+ md_json_t *msg, *jprotected;
+ const char *prot64, *pay64, *mac64, *sign, *prot;
+ md_data_t data;
+ apr_status_t rv;
+
+ msg = md_json_create(p);
+ jprotected = md_json_clone(p, prot_fields);
+ md_json_sets("HS256", jprotected, "alg", NULL);
+ prot = md_json_writep(jprotected, p, MD_JSON_FMT_COMPACT);
+ if (!prot) {
+ rv = APR_EINVAL;
+ md_log_perror(MD_LOG_MARK, MD_LOG_WARNING, rv, p, "serialize protected");
+ goto cleanup;
+ }
+
+ md_data_init(&data, prot, strlen(prot));
+ prot64 = md_util_base64url_encode(&data, p);
+ md_json_sets(prot64, msg, "protected", NULL);
+
+ pay64 = md_util_base64url_encode(payload, p);
+ md_json_sets(pay64, msg, "payload", NULL);
+ sign = apr_psprintf(p, "%s.%s", prot64, pay64);
+
+ rv = md_crypt_hmac64(&mac64, hmac_key, p, sign, strlen(sign));
+ if (APR_SUCCESS != rv) {
+ goto cleanup;
+ }
+ md_json_sets(mac64, msg, "signature", NULL);
+
+cleanup:
+ *pmsg = (APR_SUCCESS == rv)? msg : NULL;
+ return rv;
+}