Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
17926a79 DH |
2 | /* RxRPC security handling |
3 | * | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
17926a79 DH |
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> | |
33941284 | 15 | #include <keys/rxrpc-type.h> |
17926a79 DH |
16 | #include "ar-internal.h" |
17 | ||
648af7fc | 18 | static const struct rxrpc_security *rxrpc_security_types[] = { |
e0e4d82f | 19 | [RXRPC_SECURITY_NONE] = &rxrpc_no_security, |
648af7fc DH |
20 | #ifdef CONFIG_RXKAD |
21 | [RXRPC_SECURITY_RXKAD] = &rxkad, | |
22 | #endif | |
23 | }; | |
17926a79 | 24 | |
648af7fc | 25 | int __init rxrpc_init_security(void) |
17926a79 | 26 | { |
648af7fc | 27 | int i, ret; |
17926a79 | 28 | |
648af7fc DH |
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; | |
17926a79 DH |
34 | } |
35 | } | |
36 | ||
648af7fc DH |
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; | |
17926a79 DH |
44 | } |
45 | ||
648af7fc | 46 | void rxrpc_exit_security(void) |
17926a79 | 47 | { |
648af7fc | 48 | int i; |
17926a79 | 49 | |
648af7fc DH |
50 | for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) |
51 | if (rxrpc_security_types[i]) | |
52 | rxrpc_security_types[i]->exit(); | |
17926a79 DH |
53 | } |
54 | ||
648af7fc DH |
55 | /* |
56 | * look up an rxrpc security module | |
17926a79 | 57 | */ |
648af7fc | 58 | static const struct rxrpc_security *rxrpc_security_lookup(u8 security_index) |
17926a79 | 59 | { |
648af7fc DH |
60 | if (security_index >= ARRAY_SIZE(rxrpc_security_types)) |
61 | return NULL; | |
62 | return rxrpc_security_types[security_index]; | |
17926a79 DH |
63 | } |
64 | ||
17926a79 DH |
65 | /* |
66 | * initialise the security on a client connection | |
67 | */ | |
68 | int rxrpc_init_client_conn_security(struct rxrpc_connection *conn) | |
69 | { | |
648af7fc | 70 | const struct rxrpc_security *sec; |
33941284 | 71 | struct rxrpc_key_token *token; |
19ffa01c | 72 | struct key *key = conn->params.key; |
17926a79 DH |
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 | ||
146aa8b1 DH |
84 | token = key->payload.data[0]; |
85 | if (!token) | |
33941284 | 86 | return -EKEYREJECTED; |
33941284 DH |
87 | |
88 | sec = rxrpc_security_lookup(token->security_index); | |
17926a79 DH |
89 | if (!sec) |
90 | return -EKEYREJECTED; | |
91 | conn->security = sec; | |
92 | ||
93 | ret = conn->security->init_connection_security(conn); | |
94 | if (ret < 0) { | |
e0e4d82f | 95 | conn->security = &rxrpc_no_security; |
17926a79 DH |
96 | return ret; |
97 | } | |
98 | ||
99 | _leave(" = 0"); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * initialise the security on a server connection | |
105 | */ | |
106 | int rxrpc_init_server_conn_security(struct rxrpc_connection *conn) | |
107 | { | |
648af7fc | 108 | const struct rxrpc_security *sec; |
85f32278 | 109 | struct rxrpc_local *local = conn->params.local; |
17926a79 DH |
110 | struct rxrpc_sock *rx; |
111 | struct key *key; | |
112 | key_ref_t kref; | |
b4f1342f | 113 | char kdesc[5 + 1 + 3 + 1]; |
17926a79 DH |
114 | |
115 | _enter(""); | |
116 | ||
68d6d1ae | 117 | sprintf(kdesc, "%u:%u", conn->service_id, conn->security_ix); |
17926a79 DH |
118 | |
119 | sec = rxrpc_security_lookup(conn->security_ix); | |
120 | if (!sec) { | |
121 | _leave(" = -ENOKEY [lookup]"); | |
122 | return -ENOKEY; | |
123 | } | |
124 | ||
125 | /* find the service */ | |
248f219c | 126 | read_lock(&local->services_lock); |
1e9e5c95 DH |
127 | rx = rcu_dereference_protected(local->service, |
128 | lockdep_is_held(&local->services_lock)); | |
28036f44 DH |
129 | if (rx && (rx->srx.srx_service == conn->service_id || |
130 | rx->second_service == conn->service_id)) | |
1e9e5c95 | 131 | goto found_service; |
17926a79 DH |
132 | |
133 | /* the service appears to have died */ | |
248f219c | 134 | read_unlock(&local->services_lock); |
17926a79 DH |
135 | _leave(" = -ENOENT"); |
136 | return -ENOENT; | |
137 | ||
138 | found_service: | |
139 | if (!rx->securities) { | |
248f219c | 140 | read_unlock(&local->services_lock); |
17926a79 DH |
141 | _leave(" = -ENOKEY"); |
142 | return -ENOKEY; | |
143 | } | |
144 | ||
145 | /* look through the service's keyring */ | |
146 | kref = keyring_search(make_key_ref(rx->securities, 1UL), | |
dcf49dbc | 147 | &key_type_rxrpc_s, kdesc, true); |
17926a79 | 148 | if (IS_ERR(kref)) { |
248f219c | 149 | read_unlock(&local->services_lock); |
17926a79 DH |
150 | _leave(" = %ld [search]", PTR_ERR(kref)); |
151 | return PTR_ERR(kref); | |
152 | } | |
153 | ||
154 | key = key_ref_to_ptr(kref); | |
248f219c | 155 | read_unlock(&local->services_lock); |
17926a79 DH |
156 | |
157 | conn->server_key = key; | |
158 | conn->security = sec; | |
159 | ||
160 | _leave(" = 0"); | |
161 | return 0; | |
162 | } |