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17926a79 DH |
1 | /* RxRPC security handling |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/net.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/udp.h> | |
16 | #include <linux/crypto.h> | |
17 | #include <net/sock.h> | |
18 | #include <net/af_rxrpc.h> | |
33941284 | 19 | #include <keys/rxrpc-type.h> |
17926a79 DH |
20 | #include "ar-internal.h" |
21 | ||
22 | static LIST_HEAD(rxrpc_security_methods); | |
23 | static DECLARE_RWSEM(rxrpc_security_sem); | |
24 | ||
648af7fc DH |
25 | static const struct rxrpc_security *rxrpc_security_types[] = { |
26 | #ifdef CONFIG_RXKAD | |
27 | [RXRPC_SECURITY_RXKAD] = &rxkad, | |
28 | #endif | |
29 | }; | |
17926a79 | 30 | |
648af7fc | 31 | int __init rxrpc_init_security(void) |
17926a79 | 32 | { |
648af7fc | 33 | int i, ret; |
17926a79 | 34 | |
648af7fc DH |
35 | for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) { |
36 | if (rxrpc_security_types[i]) { | |
37 | ret = rxrpc_security_types[i]->init(); | |
38 | if (ret < 0) | |
39 | goto failed; | |
17926a79 DH |
40 | } |
41 | } | |
42 | ||
648af7fc DH |
43 | return 0; |
44 | ||
45 | failed: | |
46 | for (i--; i >= 0; i--) | |
47 | if (rxrpc_security_types[i]) | |
48 | rxrpc_security_types[i]->exit(); | |
49 | return ret; | |
17926a79 DH |
50 | } |
51 | ||
648af7fc | 52 | void rxrpc_exit_security(void) |
17926a79 | 53 | { |
648af7fc | 54 | int i; |
17926a79 | 55 | |
648af7fc DH |
56 | for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) |
57 | if (rxrpc_security_types[i]) | |
58 | rxrpc_security_types[i]->exit(); | |
17926a79 DH |
59 | } |
60 | ||
648af7fc DH |
61 | /* |
62 | * look up an rxrpc security module | |
17926a79 | 63 | */ |
648af7fc | 64 | static const struct rxrpc_security *rxrpc_security_lookup(u8 security_index) |
17926a79 | 65 | { |
648af7fc DH |
66 | if (security_index >= ARRAY_SIZE(rxrpc_security_types)) |
67 | return NULL; | |
68 | return rxrpc_security_types[security_index]; | |
17926a79 DH |
69 | } |
70 | ||
17926a79 DH |
71 | /* |
72 | * initialise the security on a client connection | |
73 | */ | |
74 | int rxrpc_init_client_conn_security(struct rxrpc_connection *conn) | |
75 | { | |
648af7fc | 76 | const struct rxrpc_security *sec; |
33941284 | 77 | struct rxrpc_key_token *token; |
17926a79 DH |
78 | struct key *key = conn->key; |
79 | int ret; | |
80 | ||
81 | _enter("{%d},{%x}", conn->debug_id, key_serial(key)); | |
82 | ||
83 | if (!key) | |
84 | return 0; | |
85 | ||
86 | ret = key_validate(key); | |
87 | if (ret < 0) | |
88 | return ret; | |
89 | ||
146aa8b1 DH |
90 | token = key->payload.data[0]; |
91 | if (!token) | |
33941284 | 92 | return -EKEYREJECTED; |
33941284 DH |
93 | |
94 | sec = rxrpc_security_lookup(token->security_index); | |
17926a79 DH |
95 | if (!sec) |
96 | return -EKEYREJECTED; | |
97 | conn->security = sec; | |
98 | ||
99 | ret = conn->security->init_connection_security(conn); | |
100 | if (ret < 0) { | |
17926a79 DH |
101 | conn->security = NULL; |
102 | return ret; | |
103 | } | |
104 | ||
105 | _leave(" = 0"); | |
106 | return 0; | |
107 | } | |
108 | ||
109 | /* | |
110 | * initialise the security on a server connection | |
111 | */ | |
112 | int rxrpc_init_server_conn_security(struct rxrpc_connection *conn) | |
113 | { | |
648af7fc | 114 | const struct rxrpc_security *sec; |
17926a79 DH |
115 | struct rxrpc_local *local = conn->trans->local; |
116 | struct rxrpc_sock *rx; | |
117 | struct key *key; | |
118 | key_ref_t kref; | |
b4f1342f | 119 | char kdesc[5 + 1 + 3 + 1]; |
17926a79 DH |
120 | |
121 | _enter(""); | |
122 | ||
0d12f8a4 | 123 | sprintf(kdesc, "%u:%u", conn->service_id, conn->security_ix); |
17926a79 DH |
124 | |
125 | sec = rxrpc_security_lookup(conn->security_ix); | |
126 | if (!sec) { | |
127 | _leave(" = -ENOKEY [lookup]"); | |
128 | return -ENOKEY; | |
129 | } | |
130 | ||
131 | /* find the service */ | |
132 | read_lock_bh(&local->services_lock); | |
133 | list_for_each_entry(rx, &local->services, listen_link) { | |
0d12f8a4 | 134 | if (rx->srx.srx_service == conn->service_id) |
17926a79 DH |
135 | goto found_service; |
136 | } | |
137 | ||
138 | /* the service appears to have died */ | |
139 | read_unlock_bh(&local->services_lock); | |
17926a79 DH |
140 | _leave(" = -ENOENT"); |
141 | return -ENOENT; | |
142 | ||
143 | found_service: | |
144 | if (!rx->securities) { | |
145 | read_unlock_bh(&local->services_lock); | |
17926a79 DH |
146 | _leave(" = -ENOKEY"); |
147 | return -ENOKEY; | |
148 | } | |
149 | ||
150 | /* look through the service's keyring */ | |
151 | kref = keyring_search(make_key_ref(rx->securities, 1UL), | |
152 | &key_type_rxrpc_s, kdesc); | |
153 | if (IS_ERR(kref)) { | |
154 | read_unlock_bh(&local->services_lock); | |
17926a79 DH |
155 | _leave(" = %ld [search]", PTR_ERR(kref)); |
156 | return PTR_ERR(kref); | |
157 | } | |
158 | ||
159 | key = key_ref_to_ptr(kref); | |
160 | read_unlock_bh(&local->services_lock); | |
161 | ||
162 | conn->server_key = key; | |
163 | conn->security = sec; | |
164 | ||
165 | _leave(" = 0"); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | /* | |
170 | * secure a packet prior to transmission | |
171 | */ | |
172 | int rxrpc_secure_packet(const struct rxrpc_call *call, | |
173 | struct sk_buff *skb, | |
174 | size_t data_size, | |
175 | void *sechdr) | |
176 | { | |
177 | if (call->conn->security) | |
178 | return call->conn->security->secure_packet( | |
179 | call, skb, data_size, sechdr); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
184 | * secure a packet prior to transmission | |
185 | */ | |
186 | int rxrpc_verify_packet(const struct rxrpc_call *call, struct sk_buff *skb, | |
187 | u32 *_abort_code) | |
188 | { | |
189 | if (call->conn->security) | |
190 | return call->conn->security->verify_packet( | |
191 | call, skb, _abort_code); | |
192 | return 0; | |
193 | } | |
194 | ||
195 | /* | |
196 | * clear connection security | |
197 | */ | |
198 | void rxrpc_clear_conn_security(struct rxrpc_connection *conn) | |
199 | { | |
200 | _enter("{%d}", conn->debug_id); | |
201 | ||
648af7fc | 202 | if (conn->security) |
17926a79 | 203 | conn->security->clear(conn); |
17926a79 DH |
204 | |
205 | key_put(conn->key); | |
206 | key_put(conn->server_key); | |
207 | } |