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 static 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 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 * Find the security key for a server connection.
105 */
rxrpc_look_up_server_security(struct rxrpc_local * local,struct rxrpc_sock * rx,const struct rxrpc_security ** _sec,struct key ** _key,struct sk_buff * skb)106 bool rxrpc_look_up_server_security(struct rxrpc_local *local, struct rxrpc_sock *rx,
107 const struct rxrpc_security **_sec,
108 struct key **_key,
109 struct sk_buff *skb)
110 {
111 const struct rxrpc_security *sec;
112 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
113 key_ref_t kref = NULL;
114 char kdesc[5 + 1 + 3 + 1];
115
116 _enter("");
117
118 sprintf(kdesc, "%u:%u", sp->hdr.serviceId, sp->hdr.securityIndex);
119
120 sec = rxrpc_security_lookup(sp->hdr.securityIndex);
121 if (!sec) {
122 trace_rxrpc_abort(0, "SVS",
123 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
124 RX_INVALID_OPERATION, EKEYREJECTED);
125 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
126 skb->priority = RX_INVALID_OPERATION;
127 return false;
128 }
129
130 if (sp->hdr.securityIndex == RXRPC_SECURITY_NONE)
131 goto out;
132
133 if (!rx->securities) {
134 trace_rxrpc_abort(0, "SVR",
135 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
136 RX_INVALID_OPERATION, EKEYREJECTED);
137 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
138 skb->priority = RX_INVALID_OPERATION;
139 return false;
140 }
141
142 /* look through the service's keyring */
143 kref = keyring_search(make_key_ref(rx->securities, 1UL),
144 &key_type_rxrpc_s, kdesc, true);
145 if (IS_ERR(kref)) {
146 trace_rxrpc_abort(0, "SVK",
147 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
148 sec->no_key_abort, EKEYREJECTED);
149 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
150 skb->priority = sec->no_key_abort;
151 return false;
152 }
153
154 out:
155 *_sec = sec;
156 *_key = key_ref_to_ptr(kref);
157 return true;
158 }
159