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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* RxRPC security handling
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#include <linux/module.h>
9#include <linux/net.h>
10#include <linux/skbuff.h>
11#include <linux/udp.h>
12#include <linux/crypto.h>
13#include <net/sock.h>
14#include <net/af_rxrpc.h>
15#include <keys/rxrpc-type.h>
16#include "ar-internal.h"
17
18static const struct rxrpc_security *rxrpc_security_types[] = {
19 [RXRPC_SECURITY_NONE] = &rxrpc_no_security,
20#ifdef CONFIG_RXKAD
21 [RXRPC_SECURITY_RXKAD] = &rxkad,
22#endif
23};
24
25int __init rxrpc_init_security(void)
26{
27 int i, ret;
28
29 for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) {
30 if (rxrpc_security_types[i]) {
31 ret = rxrpc_security_types[i]->init();
32 if (ret < 0)
33 goto failed;
34 }
35 }
36
37 return 0;
38
39failed:
40 for (i--; i >= 0; i--)
41 if (rxrpc_security_types[i])
42 rxrpc_security_types[i]->exit();
43 return ret;
44}
45
46void rxrpc_exit_security(void)
47{
48 int i;
49
50 for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++)
51 if (rxrpc_security_types[i])
52 rxrpc_security_types[i]->exit();
53}
54
55/*
56 * look up an rxrpc security module
57 */
58static const struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
59{
60 if (security_index >= ARRAY_SIZE(rxrpc_security_types))
61 return NULL;
62 return rxrpc_security_types[security_index];
63}
64
65/*
66 * initialise the security on a client connection
67 */
68int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
69{
70 const struct rxrpc_security *sec;
71 struct rxrpc_key_token *token;
72 struct key *key = conn->params.key;
73 int ret;
74
75 _enter("{%d},{%x}", conn->debug_id, key_serial(key));
76
77 if (!key)
78 return 0;
79
80 ret = key_validate(key);
81 if (ret < 0)
82 return ret;
83
84 token = key->payload.data[0];
85 if (!token)
86 return -EKEYREJECTED;
87
88 sec = rxrpc_security_lookup(token->security_index);
89 if (!sec)
90 return -EKEYREJECTED;
91 conn->security = sec;
92
93 ret = conn->security->init_connection_security(conn);
94 if (ret < 0) {
95 conn->security = &rxrpc_no_security;
96 return ret;
97 }
98
99 _leave(" = 0");
100 return 0;
101}
102
103/*
104 * initialise the security on a server connection
105 */
106int rxrpc_init_server_conn_security(struct rxrpc_connection *conn)
107{
108 const struct rxrpc_security *sec;
109 struct rxrpc_local *local = conn->params.local;
110 struct rxrpc_sock *rx;
111 struct key *key;
112 key_ref_t kref;
113 char kdesc[5 + 1 + 3 + 1];
114
115 _enter("");
116
117 sprintf(kdesc, "%u:%u", conn->service_id, conn->security_ix);
118
119 sec = rxrpc_security_lookup(conn->security_ix);
120 if (!sec) {
121 _leave(" = -ENOKEY [lookup]");
122 return -ENOKEY;
123 }
124
125 /* find the service */
126 read_lock(&local->services_lock);
127 rx = rcu_dereference_protected(local->service,
128 lockdep_is_held(&local->services_lock));
129 if (rx && (rx->srx.srx_service == conn->service_id ||
130 rx->second_service == conn->service_id))
131 goto found_service;
132
133 /* the service appears to have died */
134 read_unlock(&local->services_lock);
135 _leave(" = -ENOENT");
136 return -ENOENT;
137
138found_service:
139 if (!rx->securities) {
140 read_unlock(&local->services_lock);
141 _leave(" = -ENOKEY");
142 return -ENOKEY;
143 }
144
145 /* look through the service's keyring */
146 kref = keyring_search(make_key_ref(rx->securities, 1UL),
147 &key_type_rxrpc_s, kdesc);
148 if (IS_ERR(kref)) {
149 read_unlock(&local->services_lock);
150 _leave(" = %ld [search]", PTR_ERR(kref));
151 return PTR_ERR(kref);
152 }
153
154 key = key_ref_to_ptr(kref);
155 read_unlock(&local->services_lock);
156
157 conn->server_key = key;
158 conn->security = sec;
159
160 _leave(" = 0");
161 return 0;
162}