diff options
Diffstat (limited to 'src/core/security/auth.c')
| -rw-r--r-- | src/core/security/auth.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/core/security/auth.c b/src/core/security/auth.c new file mode 100644 index 0000000000..6480dd2239 --- /dev/null +++ b/src/core/security/auth.c @@ -0,0 +1,160 @@ +/* + * + * 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_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_only_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_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"}; |