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 | */ |
12da59fc | 58 | 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 | ||
f3441d41 DH |
65 | /* |
66 | * Initialise the security on a client call. | |
67 | */ | |
68 | int rxrpc_init_client_call_security(struct rxrpc_call *call) | |
69 | { | |
fdb99487 | 70 | const struct rxrpc_security *sec = &rxrpc_no_security; |
f3441d41 DH |
71 | struct rxrpc_key_token *token; |
72 | struct key *key = call->key; | |
73 | int ret; | |
74 | ||
75 | if (!key) | |
fdb99487 | 76 | goto found; |
f3441d41 DH |
77 | |
78 | ret = key_validate(key); | |
79 | if (ret < 0) | |
80 | return ret; | |
81 | ||
82 | for (token = key->payload.data[0]; token; token = token->next) { | |
83 | sec = rxrpc_security_lookup(token->security_index); | |
84 | if (sec) | |
85 | goto found; | |
86 | } | |
87 | return -EKEYREJECTED; | |
88 | ||
89 | found: | |
90 | call->security = sec; | |
fdb99487 | 91 | call->security_ix = sec->security_index; |
f3441d41 DH |
92 | return 0; |
93 | } | |
94 | ||
17926a79 DH |
95 | /* |
96 | * initialise the security on a client connection | |
97 | */ | |
98 | int rxrpc_init_client_conn_security(struct rxrpc_connection *conn) | |
99 | { | |
33941284 | 100 | struct rxrpc_key_token *token; |
2cc80086 | 101 | struct key *key = conn->key; |
9d35d880 | 102 | int ret = 0; |
17926a79 DH |
103 | |
104 | _enter("{%d},{%x}", conn->debug_id, key_serial(key)); | |
105 | ||
41057ebd | 106 | for (token = key->payload.data[0]; token; token = token->next) { |
9d35d880 | 107 | if (token->security_index == conn->security->security_index) |
41057ebd DH |
108 | goto found; |
109 | } | |
110 | return -EKEYREJECTED; | |
33941284 | 111 | |
41057ebd | 112 | found: |
9d35d880 DH |
113 | mutex_lock(&conn->security_lock); |
114 | if (conn->state == RXRPC_CONN_CLIENT_UNSECURED) { | |
115 | ret = conn->security->init_connection_security(conn, token); | |
116 | if (ret == 0) { | |
117 | spin_lock(&conn->state_lock); | |
118 | if (conn->state == RXRPC_CONN_CLIENT_UNSECURED) | |
119 | conn->state = RXRPC_CONN_CLIENT; | |
120 | spin_unlock(&conn->state_lock); | |
121 | } | |
17926a79 | 122 | } |
9d35d880 DH |
123 | mutex_unlock(&conn->security_lock); |
124 | return ret; | |
17926a79 DH |
125 | } |
126 | ||
127 | /* | |
ec832bd0 | 128 | * Set the ops a server connection. |
17926a79 | 129 | */ |
ec832bd0 DH |
130 | const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *rx, |
131 | struct sk_buff *skb) | |
17926a79 | 132 | { |
648af7fc | 133 | const struct rxrpc_security *sec; |
063c60d3 | 134 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 DH |
135 | |
136 | _enter(""); | |
137 | ||
063c60d3 | 138 | sec = rxrpc_security_lookup(sp->hdr.securityIndex); |
17926a79 | 139 | if (!sec) { |
57af281e DH |
140 | rxrpc_direct_abort(skb, rxrpc_abort_unsupported_security, |
141 | RX_INVALID_OPERATION, -EKEYREJECTED); | |
ec832bd0 | 142 | return NULL; |
17926a79 DH |
143 | } |
144 | ||
ec832bd0 DH |
145 | if (sp->hdr.securityIndex != RXRPC_SECURITY_NONE && |
146 | !rx->securities) { | |
57af281e DH |
147 | rxrpc_direct_abort(skb, rxrpc_abort_no_service_key, |
148 | sec->no_key_abort, -EKEYREJECTED); | |
ec832bd0 | 149 | return NULL; |
17926a79 DH |
150 | } |
151 | ||
ec832bd0 DH |
152 | return sec; |
153 | } | |
154 | ||
155 | /* | |
156 | * Find the security key for a server connection. | |
157 | */ | |
158 | struct key *rxrpc_look_up_server_security(struct rxrpc_connection *conn, | |
159 | struct sk_buff *skb, | |
160 | u32 kvno, u32 enctype) | |
161 | { | |
162 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
163 | struct rxrpc_sock *rx; | |
164 | struct key *key = ERR_PTR(-EKEYREJECTED); | |
165 | key_ref_t kref = NULL; | |
166 | char kdesc[5 + 1 + 3 + 1 + 12 + 1 + 12 + 1]; | |
167 | int ret; | |
168 | ||
169 | _enter(""); | |
170 | ||
171 | if (enctype) | |
172 | sprintf(kdesc, "%u:%u:%u:%u", | |
173 | sp->hdr.serviceId, sp->hdr.securityIndex, kvno, enctype); | |
174 | else if (kvno) | |
175 | sprintf(kdesc, "%u:%u:%u", | |
176 | sp->hdr.serviceId, sp->hdr.securityIndex, kvno); | |
177 | else | |
178 | sprintf(kdesc, "%u:%u", | |
179 | sp->hdr.serviceId, sp->hdr.securityIndex); | |
180 | ||
42f229c3 | 181 | read_lock(&conn->local->services_lock); |
ec832bd0 | 182 | |
42f229c3 | 183 | rx = conn->local->service; |
ec832bd0 DH |
184 | if (!rx) |
185 | goto out; | |
186 | ||
17926a79 DH |
187 | /* look through the service's keyring */ |
188 | kref = keyring_search(make_key_ref(rx->securities, 1UL), | |
dcf49dbc | 189 | &key_type_rxrpc_s, kdesc, true); |
17926a79 | 190 | if (IS_ERR(kref)) { |
ec832bd0 DH |
191 | key = ERR_CAST(kref); |
192 | goto out; | |
193 | } | |
194 | ||
195 | key = key_ref_to_ptr(kref); | |
196 | ||
197 | ret = key_validate(key); | |
198 | if (ret < 0) { | |
199 | key_put(key); | |
200 | key = ERR_PTR(ret); | |
201 | goto out; | |
17926a79 DH |
202 | } |
203 | ||
063c60d3 | 204 | out: |
42f229c3 | 205 | read_unlock(&conn->local->services_lock); |
ec832bd0 | 206 | return key; |
17926a79 | 207 | } |