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210 lines · 4.5 KiB

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 ([email protected])
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#ifdef CONFIG_RXGK
24 [RXRPC_SECURITY_YFS_RXGK] = &rxgk_yfs,
25#endif
26};
27
28int __init rxrpc_init_security(void)
29{
30 int i, ret;
31
32 for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) {
33 if (rxrpc_security_types[i]) {
34 ret = rxrpc_security_types[i]->init();
35 if (ret < 0)
36 goto failed;
37 }
38 }
39
40 return 0;
41
42failed:
43 for (i--; i >= 0; i--)
44 if (rxrpc_security_types[i])
45 rxrpc_security_types[i]->exit();
46 return ret;
47}
48
49void rxrpc_exit_security(void)
50{
51 int i;
52
53 for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++)
54 if (rxrpc_security_types[i])
55 rxrpc_security_types[i]->exit();
56}
57
58/*
59 * look up an rxrpc security module
60 */
61const struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
62{
63 if (security_index >= ARRAY_SIZE(rxrpc_security_types))
64 return NULL;
65 return rxrpc_security_types[security_index];
66}
67
68/*
69 * Initialise the security on a client call.
70 */
71int rxrpc_init_client_call_security(struct rxrpc_call *call)
72{
73 const struct rxrpc_security *sec = &rxrpc_no_security;
74 struct rxrpc_key_token *token;
75 struct key *key = call->key;
76 int ret;
77
78 if (!key)
79 goto found;
80
81 ret = key_validate(key);
82 if (ret < 0)
83 return ret;
84
85 for (token = key->payload.data[0]; token; token = token->next) {
86 sec = rxrpc_security_lookup(token->security_index);
87 if (sec)
88 goto found;
89 }
90 return -EKEYREJECTED;
91
92found:
93 call->security = sec;
94 call->security_ix = sec->security_index;
95 return 0;
96}
97
98/*
99 * initialise the security on a client connection
100 */
101int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
102{
103 struct rxrpc_key_token *token;
104 struct key *key = conn->key;
105 int ret = 0;
106
107 _enter("{%d},{%x}", conn->debug_id, key_serial(key));
108
109 for (token = key->payload.data[0]; token; token = token->next) {
110 if (token->security_index == conn->security->security_index)
111 goto found;
112 }
113 return -EKEYREJECTED;
114
115found:
116 mutex_lock(&conn->security_lock);
117 if (conn->state == RXRPC_CONN_CLIENT_UNSECURED) {
118 ret = conn->security->init_connection_security(conn, token);
119 if (ret == 0) {
120 spin_lock_irq(&conn->state_lock);
121 if (conn->state == RXRPC_CONN_CLIENT_UNSECURED)
122 conn->state = RXRPC_CONN_CLIENT;
123 spin_unlock_irq(&conn->state_lock);
124 }
125 }
126 mutex_unlock(&conn->security_lock);
127 return ret;
128}
129
130/*
131 * Set the ops a server connection.
132 */
133const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *rx,
134 struct sk_buff *skb)
135{
136 const struct rxrpc_security *sec;
137 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
138
139 _enter("");
140
141 sec = rxrpc_security_lookup(sp->hdr.securityIndex);
142 if (!sec) {
143 rxrpc_direct_conn_abort(skb, rxrpc_abort_unsupported_security,
144 RX_INVALID_OPERATION, -EKEYREJECTED);
145 return NULL;
146 }
147
148 if (sp->hdr.securityIndex != RXRPC_SECURITY_NONE &&
149 !rx->securities) {
150 rxrpc_direct_conn_abort(skb, rxrpc_abort_no_service_key,
151 sec->no_key_abort, -EKEYREJECTED);
152 return NULL;
153 }
154
155 return sec;
156}
157
158/*
159 * Find the security key for a server connection.
160 */
161struct key *rxrpc_look_up_server_security(struct rxrpc_connection *conn,
162 struct sk_buff *skb,
163 u32 kvno, u32 enctype)
164{
165 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
166 struct rxrpc_sock *rx;
167 struct key *key = ERR_PTR(-EKEYREJECTED);
168 key_ref_t kref = NULL;
169 char kdesc[5 + 1 + 3 + 1 + 12 + 1 + 12 + 1];
170 int ret;
171
172 _enter("");
173
174 if (enctype)
175 sprintf(kdesc, "%u:%u:%u:%u",
176 sp->hdr.serviceId, sp->hdr.securityIndex, kvno, enctype);
177 else if (kvno)
178 sprintf(kdesc, "%u:%u:%u",
179 sp->hdr.serviceId, sp->hdr.securityIndex, kvno);
180 else
181 sprintf(kdesc, "%u:%u",
182 sp->hdr.serviceId, sp->hdr.securityIndex);
183
184 read_lock(&conn->local->services_lock);
185
186 rx = conn->local->service;
187 if (!rx)
188 goto out;
189
190 /* look through the service's keyring */
191 kref = keyring_search(make_key_ref(rx->securities, 1UL),
192 &key_type_rxrpc_s, kdesc, true);
193 if (IS_ERR(kref)) {
194 key = ERR_CAST(kref);
195 goto out;
196 }
197
198 key = key_ref_to_ptr(kref);
199
200 ret = key_validate(key);
201 if (ret < 0) {
202 key_put(key);
203 key = ERR_PTR(ret);
204 goto out;
205 }
206
207out:
208 read_unlock(&conn->local->services_lock);
209 return key;
210}