diff options
Diffstat (limited to 'src/core/lib/security/credentials/jwt/jwt_credentials.c')
| -rw-r--r-- | src/core/lib/security/credentials/jwt/jwt_credentials.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/core/lib/security/credentials/jwt/jwt_credentials.c b/src/core/lib/security/credentials/jwt/jwt_credentials.c new file mode 100644 index 0000000000..f87ba0ce8d --- /dev/null +++ b/src/core/lib/security/credentials/jwt/jwt_credentials.c @@ -0,0 +1,161 @@ +/* + * + * Copyright 2016, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include "src/core/lib/security/credentials/jwt/jwt_credentials.h" + +#include <string.h> + +#include "src/core/lib/surface/api_trace.h" + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <grpc/support/sync.h> + +static void jwt_reset_cache(grpc_service_account_jwt_access_credentials *c) { + if (c->cached.jwt_md != NULL) { + grpc_credentials_md_store_unref(c->cached.jwt_md); + c->cached.jwt_md = NULL; + } + if (c->cached.service_url != NULL) { + gpr_free(c->cached.service_url); + c->cached.service_url = NULL; + } + c->cached.jwt_expiration = gpr_inf_past(GPR_CLOCK_REALTIME); +} + +static void jwt_destruct(grpc_call_credentials *creds) { + grpc_service_account_jwt_access_credentials *c = + (grpc_service_account_jwt_access_credentials *)creds; + grpc_auth_json_key_destruct(&c->key); + jwt_reset_cache(c); + gpr_mu_destroy(&c->cache_mu); +} + +static void jwt_get_request_metadata(grpc_exec_ctx *exec_ctx, + grpc_call_credentials *creds, + grpc_polling_entity *pollent, + grpc_auth_metadata_context context, + grpc_credentials_metadata_cb cb, + void *user_data) { + grpc_service_account_jwt_access_credentials *c = + (grpc_service_account_jwt_access_credentials *)creds; + gpr_timespec refresh_threshold = gpr_time_from_seconds( + GRPC_SECURE_TOKEN_REFRESH_THRESHOLD_SECS, GPR_TIMESPAN); + + /* See if we can return a cached jwt. */ + grpc_credentials_md_store *jwt_md = NULL; + { + gpr_mu_lock(&c->cache_mu); + if (c->cached.service_url != NULL && + strcmp(c->cached.service_url, context.service_url) == 0 && + c->cached.jwt_md != NULL && + (gpr_time_cmp(gpr_time_sub(c->cached.jwt_expiration, + gpr_now(GPR_CLOCK_REALTIME)), + refresh_threshold) > 0)) { + jwt_md = grpc_credentials_md_store_ref(c->cached.jwt_md); + } + gpr_mu_unlock(&c->cache_mu); + } + + if (jwt_md == NULL) { + char *jwt = NULL; + /* Generate a new jwt. */ + gpr_mu_lock(&c->cache_mu); + jwt_reset_cache(c); + jwt = grpc_jwt_encode_and_sign(&c->key, context.service_url, + c->jwt_lifetime, NULL); + if (jwt != NULL) { + char *md_value; + gpr_asprintf(&md_value, "Bearer %s", jwt); + gpr_free(jwt); + c->cached.jwt_expiration = + gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), c->jwt_lifetime); + c->cached.service_url = gpr_strdup(context.service_url); + c->cached.jwt_md = grpc_credentials_md_store_create(1); + grpc_credentials_md_store_add_cstrings( + c->cached.jwt_md, GRPC_AUTHORIZATION_METADATA_KEY, md_value); + gpr_free(md_value); + jwt_md = grpc_credentials_md_store_ref(c->cached.jwt_md); + } + gpr_mu_unlock(&c->cache_mu); + } + + if (jwt_md != NULL) { + cb(exec_ctx, user_data, jwt_md->entries, jwt_md->num_entries, + GRPC_CREDENTIALS_OK, NULL); + grpc_credentials_md_store_unref(jwt_md); + } else { + cb(exec_ctx, user_data, NULL, 0, GRPC_CREDENTIALS_ERROR, + "Could not generate JWT."); + } +} + +static grpc_call_credentials_vtable jwt_vtable = {jwt_destruct, + jwt_get_request_metadata}; + +grpc_call_credentials * +grpc_service_account_jwt_access_credentials_create_from_auth_json_key( + grpc_auth_json_key key, gpr_timespec token_lifetime) { + grpc_service_account_jwt_access_credentials *c; + if (!grpc_auth_json_key_is_valid(&key)) { + gpr_log(GPR_ERROR, "Invalid input for jwt credentials creation"); + return NULL; + } + c = gpr_malloc(sizeof(grpc_service_account_jwt_access_credentials)); + memset(c, 0, sizeof(grpc_service_account_jwt_access_credentials)); + c->base.type = GRPC_CALL_CREDENTIALS_TYPE_JWT; + gpr_ref_init(&c->base.refcount, 1); + c->base.vtable = &jwt_vtable; + c->key = key; + c->jwt_lifetime = token_lifetime; + gpr_mu_init(&c->cache_mu); + jwt_reset_cache(c); + return &c->base; +} + +grpc_call_credentials *grpc_service_account_jwt_access_credentials_create( + const char *json_key, gpr_timespec token_lifetime, void *reserved) { + GRPC_API_TRACE( + "grpc_service_account_jwt_access_credentials_create(" + "json_key=%s, " + "token_lifetime=" + "gpr_timespec { tv_sec: %" PRId64 + ", tv_nsec: %d, clock_type: %d }, " + "reserved=%p)", + 5, (json_key, token_lifetime.tv_sec, token_lifetime.tv_nsec, + (int)token_lifetime.clock_type, reserved)); + GPR_ASSERT(reserved == NULL); + return grpc_service_account_jwt_access_credentials_create_from_auth_json_key( + grpc_auth_json_key_create_from_string(json_key), token_lifetime); +} |