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/*
*
* Copyright 2015, 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 <stdio.h>
#include <string.h>
#include "src/core/security/credentials.h"
#include <grpc/grpc.h>
#include <grpc/grpc_security.h>
#include <grpc/support/alloc.h>
#include <grpc/support/cmdline.h>
#include <grpc/support/log.h>
#include <grpc/support/slice.h>
#include <grpc/support/sync.h>
typedef struct {
gpr_cv cv;
gpr_mu mu;
int is_done;
} synchronizer;
static void on_oauth2_response(void *user_data, grpc_mdelem **md_elems,
size_t num_md, grpc_credentials_status status) {
synchronizer *sync = user_data;
char *token;
gpr_slice token_slice;
if (status == GRPC_CREDENTIALS_ERROR) {
gpr_log(GPR_ERROR, "Fetching token failed.");
} else {
GPR_ASSERT(num_md == 1);
token_slice = md_elems[0]->value->slice;
token = gpr_malloc(GPR_SLICE_LENGTH(token_slice) + 1);
memcpy(token, GPR_SLICE_START_PTR(token_slice),
GPR_SLICE_LENGTH(token_slice));
token[GPR_SLICE_LENGTH(token_slice)] = '\0';
printf("Got token: %s.\n", token);
gpr_free(token);
}
gpr_mu_lock(&sync->mu);
sync->is_done = 1;
gpr_mu_unlock(&sync->mu);
gpr_cv_signal(&sync->cv);
}
static grpc_credentials *create_service_account_creds(
const char *json_key_file_path, const char *scope) {
char json_key[8192]; /* Should be plenty. */
char *current = json_key;
FILE *json_key_file = fopen(json_key_file_path, "r");
if (json_key_file == NULL) {
gpr_log(GPR_ERROR, "Invalid path for json key file: %s.",
json_key_file_path);
exit(1);
}
do {
size_t bytes_read = fread(
current, 1, sizeof(json_key) - (current - json_key), json_key_file);
if (bytes_read == 0) {
if (!feof(json_key_file)) {
gpr_log(GPR_ERROR, "Error occured while reading %s.",
json_key_file_path);
exit(1);
}
break;
}
current += bytes_read;
} while (sizeof(json_key) > (size_t)(current - json_key));
if ((current - json_key) == sizeof(json_key)) {
gpr_log(GPR_ERROR, "Json key file %s exceeds size limit (%d bytes).",
json_key_file_path, (int)sizeof(json_key));
exit(1);
}
fclose(json_key_file);
return grpc_service_account_credentials_create(json_key, scope,
grpc_max_auth_token_lifetime);
}
int main(int argc, char **argv) {
synchronizer sync;
grpc_credentials *creds = NULL;
char *json_key_file_path = NULL;
int use_gce = 0;
char *scope = NULL;
gpr_cmdline *cl = gpr_cmdline_create("fetch_oauth2");
gpr_cmdline_add_string(cl, "json_key", "File path of the json key.",
&json_key_file_path);
gpr_cmdline_add_string(cl, "scope", "Space delimited permissions.", &scope);
gpr_cmdline_add_flag(
cl, "gce",
"Get a token from the GCE metadata server (only works in GCE).",
&use_gce);
gpr_cmdline_parse(cl, argc, argv);
grpc_init();
if (use_gce) {
if (json_key_file_path != NULL || scope != NULL) {
gpr_log(GPR_INFO,
"Ignoring json key and scope to get a token from the GCE "
"metadata server.");
}
creds = grpc_compute_engine_credentials_create();
if (creds == NULL) {
gpr_log(GPR_ERROR, "Could not create gce credentials.");
exit(1);
}
} else {
if (json_key_file_path == NULL) {
gpr_log(GPR_ERROR, "missing --json_key option.");
exit(1);
}
if (scope == NULL) {
gpr_log(GPR_ERROR, "Missing --scope option.");
exit(1);
}
creds = create_service_account_creds(json_key_file_path, scope);
if (creds == NULL) {
gpr_log(GPR_ERROR,
"Could not create service account creds. %s does probably not "
"contain a valid json key.",
json_key_file_path);
exit(1);
}
}
GPR_ASSERT(creds != NULL);
gpr_mu_init(&sync.mu);
gpr_cv_init(&sync.cv);
sync.is_done = 0;
grpc_credentials_get_request_metadata(creds, on_oauth2_response, &sync);
gpr_mu_lock(&sync.mu);
while (!sync.is_done) gpr_cv_wait(&sync.cv, &sync.mu, gpr_inf_future);
gpr_mu_unlock(&sync.mu);
gpr_mu_destroy(&sync.mu);
gpr_cv_destroy(&sync.cv);
grpc_credentials_release(creds);
gpr_cmdline_destroy(cl);
grpc_shutdown();
return 0;
}
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