Commit | Line | Data |
---|---|---|
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 | ||
648af7fc | 22 | static const struct rxrpc_security *rxrpc_security_types[] = { |
e0e4d82f | 23 | [RXRPC_SECURITY_NONE] = &rxrpc_no_security, |
648af7fc DH |
24 | #ifdef CONFIG_RXKAD |
25 | [RXRPC_SECURITY_RXKAD] = &rxkad, | |
26 | #endif | |
27 | }; | |
17926a79 | 28 | |
648af7fc | 29 | int __init rxrpc_init_security(void) |
17926a79 | 30 | { |
648af7fc | 31 | int i, ret; |
17926a79 | 32 | |
648af7fc DH |
33 | for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) { |
34 | if (rxrpc_security_types[i]) { | |
35 | ret = rxrpc_security_types[i]->init(); | |
36 | if (ret < 0) | |
37 | goto failed; | |
17926a79 DH |
38 | } |
39 | } | |
40 | ||
648af7fc DH |
41 | return 0; |
42 | ||
43 | failed: | |
44 | for (i--; i >= 0; i--) | |
45 | if (rxrpc_security_types[i]) | |
46 | rxrpc_security_types[i]->exit(); | |
47 | return ret; | |
17926a79 DH |
48 | } |
49 | ||
648af7fc | 50 | void rxrpc_exit_security(void) |
17926a79 | 51 | { |
648af7fc | 52 | int i; |
17926a79 | 53 | |
648af7fc DH |
54 | for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) |
55 | if (rxrpc_security_types[i]) | |
56 | rxrpc_security_types[i]->exit(); | |
17926a79 DH |
57 | } |
58 | ||
648af7fc DH |
59 | /* |
60 | * look up an rxrpc security module | |
17926a79 | 61 | */ |
648af7fc | 62 | static const struct rxrpc_security *rxrpc_security_lookup(u8 security_index) |
17926a79 | 63 | { |
648af7fc DH |
64 | if (security_index >= ARRAY_SIZE(rxrpc_security_types)) |
65 | return NULL; | |
66 | return rxrpc_security_types[security_index]; | |
17926a79 DH |
67 | } |
68 | ||
17926a79 DH |
69 | /* |
70 | * initialise the security on a client connection | |
71 | */ | |
72 | int rxrpc_init_client_conn_security(struct rxrpc_connection *conn) | |
73 | { | |
648af7fc | 74 | const struct rxrpc_security *sec; |
33941284 | 75 | struct rxrpc_key_token *token; |
19ffa01c | 76 | struct key *key = conn->params.key; |
17926a79 DH |
77 | int ret; |
78 | ||
79 | _enter("{%d},{%x}", conn->debug_id, key_serial(key)); | |
80 | ||
81 | if (!key) | |
82 | return 0; | |
83 | ||
84 | ret = key_validate(key); | |
85 | if (ret < 0) | |
86 | return ret; | |
87 | ||
146aa8b1 DH |
88 | token = key->payload.data[0]; |
89 | if (!token) | |
33941284 | 90 | return -EKEYREJECTED; |
33941284 DH |
91 | |
92 | sec = rxrpc_security_lookup(token->security_index); | |
17926a79 DH |
93 | if (!sec) |
94 | return -EKEYREJECTED; | |
95 | conn->security = sec; | |
96 | ||
97 | ret = conn->security->init_connection_security(conn); | |
98 | if (ret < 0) { | |
e0e4d82f | 99 | conn->security = &rxrpc_no_security; |
17926a79 DH |
100 | return ret; |
101 | } | |
102 | ||
103 | _leave(" = 0"); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | /* | |
108 | * initialise the security on a server connection | |
109 | */ | |
110 | int rxrpc_init_server_conn_security(struct rxrpc_connection *conn) | |
111 | { | |
648af7fc | 112 | const struct rxrpc_security *sec; |
85f32278 | 113 | struct rxrpc_local *local = conn->params.local; |
17926a79 DH |
114 | struct rxrpc_sock *rx; |
115 | struct key *key; | |
116 | key_ref_t kref; | |
b4f1342f | 117 | char kdesc[5 + 1 + 3 + 1]; |
17926a79 DH |
118 | |
119 | _enter(""); | |
120 | ||
68d6d1ae | 121 | sprintf(kdesc, "%u:%u", conn->service_id, conn->security_ix); |
17926a79 DH |
122 | |
123 | sec = rxrpc_security_lookup(conn->security_ix); | |
124 | if (!sec) { | |
125 | _leave(" = -ENOKEY [lookup]"); | |
126 | return -ENOKEY; | |
127 | } | |
128 | ||
129 | /* find the service */ | |
248f219c | 130 | read_lock(&local->services_lock); |
1e9e5c95 DH |
131 | rx = rcu_dereference_protected(local->service, |
132 | lockdep_is_held(&local->services_lock)); | |
28036f44 DH |
133 | if (rx && (rx->srx.srx_service == conn->service_id || |
134 | rx->second_service == conn->service_id)) | |
1e9e5c95 | 135 | goto found_service; |
17926a79 DH |
136 | |
137 | /* the service appears to have died */ | |
248f219c | 138 | read_unlock(&local->services_lock); |
17926a79 DH |
139 | _leave(" = -ENOENT"); |
140 | return -ENOENT; | |
141 | ||
142 | found_service: | |
143 | if (!rx->securities) { | |
248f219c | 144 | read_unlock(&local->services_lock); |
17926a79 DH |
145 | _leave(" = -ENOKEY"); |
146 | return -ENOKEY; | |
147 | } | |
148 | ||
149 | /* look through the service's keyring */ | |
150 | kref = keyring_search(make_key_ref(rx->securities, 1UL), | |
151 | &key_type_rxrpc_s, kdesc); | |
152 | if (IS_ERR(kref)) { | |
248f219c | 153 | read_unlock(&local->services_lock); |
17926a79 DH |
154 | _leave(" = %ld [search]", PTR_ERR(kref)); |
155 | return PTR_ERR(kref); | |
156 | } | |
157 | ||
158 | key = key_ref_to_ptr(kref); | |
248f219c | 159 | read_unlock(&local->services_lock); |
17926a79 DH |
160 | |
161 | conn->server_key = key; | |
162 | conn->security = sec; | |
163 | ||
164 | _leave(" = 0"); | |
165 | return 0; | |
166 | } |