1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
*
* 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"};
|
