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
18 static 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
rxrpc_init_security(void)25 int __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
39 failed:
40 for (i--; i >= 0; i--)
41 if (rxrpc_security_types[i])
42 rxrpc_security_types[i]->exit();
43 return ret;
44 }
45
rxrpc_exit_security(void)46 void 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 */
rxrpc_security_lookup(u8 security_index)58 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 */
rxrpc_init_client_conn_security(struct rxrpc_connection * conn)68 int 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 for (token = key->payload.data[0]; token; token = token->next) {
85 sec = rxrpc_security_lookup(token->security_index);
86 if (sec)
87 goto found;
88 }
89 return -EKEYREJECTED;
90
91 found:
92 conn->security = sec;
93
94 ret = conn->security->init_connection_security(conn, token);
95 if (ret < 0) {
96 conn->security = &rxrpc_no_security;
97 return ret;
98 }
99
100 _leave(" = 0");
101 return 0;
102 }
103
104 /*
105 * Set the ops a server connection.
106 */
rxrpc_get_incoming_security(struct rxrpc_sock * rx,struct sk_buff * skb)107 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *rx,
108 struct sk_buff *skb)
109 {
110 const struct rxrpc_security *sec;
111 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
112
113 _enter("");
114
115 sec = rxrpc_security_lookup(sp->hdr.securityIndex);
116 if (!sec) {
117 trace_rxrpc_abort(0, "SVS",
118 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
119 RX_INVALID_OPERATION, EKEYREJECTED);
120 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
121 skb->priority = RX_INVALID_OPERATION;
122 return NULL;
123 }
124
125 if (sp->hdr.securityIndex != RXRPC_SECURITY_NONE &&
126 !rx->securities) {
127 trace_rxrpc_abort(0, "SVR",
128 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
129 RX_INVALID_OPERATION, EKEYREJECTED);
130 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
131 skb->priority = sec->no_key_abort;
132 return NULL;
133 }
134
135 return sec;
136 }
137
138 /*
139 * Find the security key for a server connection.
140 */
rxrpc_look_up_server_security(struct rxrpc_connection * conn,struct sk_buff * skb,u32 kvno,u32 enctype)141 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *conn,
142 struct sk_buff *skb,
143 u32 kvno, u32 enctype)
144 {
145 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
146 struct rxrpc_sock *rx;
147 struct key *key = ERR_PTR(-EKEYREJECTED);
148 key_ref_t kref = NULL;
149 char kdesc[5 + 1 + 3 + 1 + 12 + 1 + 12 + 1];
150 int ret;
151
152 _enter("");
153
154 if (enctype)
155 sprintf(kdesc, "%u:%u:%u:%u",
156 sp->hdr.serviceId, sp->hdr.securityIndex, kvno, enctype);
157 else if (kvno)
158 sprintf(kdesc, "%u:%u:%u",
159 sp->hdr.serviceId, sp->hdr.securityIndex, kvno);
160 else
161 sprintf(kdesc, "%u:%u",
162 sp->hdr.serviceId, sp->hdr.securityIndex);
163
164 rcu_read_lock();
165
166 rx = rcu_dereference(conn->params.local->service);
167 if (!rx)
168 goto out;
169
170 /* look through the service's keyring */
171 kref = keyring_search(make_key_ref(rx->securities, 1UL),
172 &key_type_rxrpc_s, kdesc, true);
173 if (IS_ERR(kref)) {
174 key = ERR_CAST(kref);
175 goto out;
176 }
177
178 key = key_ref_to_ptr(kref);
179
180 ret = key_validate(key);
181 if (ret < 0) {
182 key_put(key);
183 key = ERR_PTR(ret);
184 goto out;
185 }
186
187 out:
188 rcu_read_unlock();
189 return key;
190 }
191
