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/*
*
* Copyright 2014, 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/security/auth.h"
#include <string.h>
#include "src/core/security/security_context.h"
#include "src/core/security/credentials.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
/* We can have a per-call credentials. */
typedef struct {
grpc_credentials *creds;
grpc_call_op op;
} call_data;
/* We can have a per-channel credentials. */
typedef struct {
grpc_channel_security_context *security_context;
} channel_data;
static void on_credentials_metadata(void *user_data, grpc_mdelem **md_elems,
size_t num_md,
grpc_credentials_status status) {
grpc_call_element *elem = (grpc_call_element *)user_data;
size_t i;
for (i = 0; i < num_md; i++) {
grpc_call_element_send_metadata(elem, md_elems[i]);
}
grpc_call_next_op(elem, &((call_data *)elem->call_data)->op);
}
/* Called either:
- in response to an API call (or similar) from above, to send something
- a network event (or similar) from below, to receive something
op contains type and call direction information, in addition to the data
that is being sent or received. */
static void call_op(grpc_call_element *elem, grpc_call_element *from_elem,
grpc_call_op *op) {
/* grab pointers to our data from the call element */
call_data *calld = elem->call_data;
channel_data *channeld = elem->channel_data;
switch (op->type) {
case GRPC_SEND_START: {
grpc_credentials *channel_creds =
channeld->security_context->request_metadata_creds;
/* TODO(jboeuf):
Decide on the policy in this case:
- populate both channel and call?
- the call takes precedence over the channel?
- leave this decision up to the channel credentials? */
if (calld->creds != NULL) {
gpr_log(GPR_ERROR, "Ignoring per call credentials for now.");
}
if (channel_creds != NULL &&
grpc_credentials_has_request_metadata(channel_creds)) {
calld->op = *op; /* Copy op (originates from the caller's stack). */
grpc_credentials_get_request_metadata(channel_creds,
on_credentials_metadata, elem);
break;
}
/* FALLTHROUGH INTENDED. */
}
default:
/* pass control up or down the stack depending on op->dir */
grpc_call_next_op(elem, op);
break;
}
}
/* Called on special channel events, such as disconnection or new incoming
calls on the server */
static void channel_op(grpc_channel_element *elem,
grpc_channel_element *from_elem, grpc_channel_op *op) {
grpc_channel_next_op(elem, op);
}
/* Constructor for call_data */
static void init_call_elem(grpc_call_element *elem,
const void *server_transport_data) {
/* TODO(jboeuf):
Find a way to pass-in the credentials from the caller here. */
call_data *calld = elem->call_data;
calld->creds = NULL;
}
/* Destructor for call_data */
static void destroy_call_elem(grpc_call_element *elem) {
call_data *calld = elem->call_data;
if (calld->creds != NULL) {
grpc_credentials_unref(calld->creds);
}
}
/* Constructor for channel_data */
static void init_channel_elem(grpc_channel_element *elem,
const grpc_channel_args *args,
grpc_mdctx *metadata_context, int is_first,
int is_last) {
grpc_security_context *ctx = grpc_find_security_context_in_args(args);
/* grab pointers to our data from the channel element */
channel_data *channeld = elem->channel_data;
/* The first and the last filters tend to be implemented differently to
handle the case that there's no 'next' filter to call on the up or down
path */
GPR_ASSERT(!is_first);
GPR_ASSERT(!is_last);
GPR_ASSERT(ctx != NULL);
/* initialize members */
GPR_ASSERT(ctx->is_client_side);
channeld->security_context =
(grpc_channel_security_context *)grpc_security_context_ref(ctx);
}
/* Destructor for channel data */
static void destroy_channel_elem(grpc_channel_element *elem) {
/* grab pointers to our data from the channel element */
channel_data *channeld = elem->channel_data;
grpc_channel_security_context *ctx = channeld->security_context;
if (ctx != NULL) grpc_security_context_unref(&ctx->base);
}
const grpc_channel_filter grpc_client_auth_filter = {
call_op, channel_op, sizeof(call_data), init_call_elem, destroy_call_elem,
sizeof(channel_data), init_channel_elem, destroy_channel_elem, "auth"};
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