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Linux/net/rxrpc/ar-security.c

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  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>
 19 #include <keys/rxrpc-type.h>
 20 #include "ar-internal.h"
 21 
 22 static LIST_HEAD(rxrpc_security_methods);
 23 static DECLARE_RWSEM(rxrpc_security_sem);
 24 
 25 /*
 26  * get an RxRPC security module
 27  */
 28 static struct rxrpc_security *rxrpc_security_get(struct rxrpc_security *sec)
 29 {
 30         return try_module_get(sec->owner) ? sec : NULL;
 31 }
 32 
 33 /*
 34  * release an RxRPC security module
 35  */
 36 static void rxrpc_security_put(struct rxrpc_security *sec)
 37 {
 38         module_put(sec->owner);
 39 }
 40 
 41 /*
 42  * look up an rxrpc security module
 43  */
 44 static struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
 45 {
 46         struct rxrpc_security *sec = NULL;
 47 
 48         _enter("");
 49 
 50         down_read(&rxrpc_security_sem);
 51 
 52         list_for_each_entry(sec, &rxrpc_security_methods, link) {
 53                 if (sec->security_index == security_index) {
 54                         if (unlikely(!rxrpc_security_get(sec)))
 55                                 break;
 56                         goto out;
 57                 }
 58         }
 59 
 60         sec = NULL;
 61 out:
 62         up_read(&rxrpc_security_sem);
 63         _leave(" = %p [%s]", sec, sec ? sec->name : "");
 64         return sec;
 65 }
 66 
 67 /**
 68  * rxrpc_register_security - register an RxRPC security handler
 69  * @sec: security module
 70  *
 71  * register an RxRPC security handler for use by RxRPC
 72  */
 73 int rxrpc_register_security(struct rxrpc_security *sec)
 74 {
 75         struct rxrpc_security *psec;
 76         int ret;
 77 
 78         _enter("");
 79         down_write(&rxrpc_security_sem);
 80 
 81         ret = -EEXIST;
 82         list_for_each_entry(psec, &rxrpc_security_methods, link) {
 83                 if (psec->security_index == sec->security_index)
 84                         goto out;
 85         }
 86 
 87         list_add(&sec->link, &rxrpc_security_methods);
 88 
 89         printk(KERN_NOTICE "RxRPC: Registered security type %d '%s'\n",
 90                sec->security_index, sec->name);
 91         ret = 0;
 92 
 93 out:
 94         up_write(&rxrpc_security_sem);
 95         _leave(" = %d", ret);
 96         return ret;
 97 }
 98 
 99 EXPORT_SYMBOL_GPL(rxrpc_register_security);
100 
101 /**
102  * rxrpc_unregister_security - unregister an RxRPC security handler
103  * @sec: security module
104  *
105  * unregister an RxRPC security handler
106  */
107 void rxrpc_unregister_security(struct rxrpc_security *sec)
108 {
109 
110         _enter("");
111         down_write(&rxrpc_security_sem);
112         list_del_init(&sec->link);
113         up_write(&rxrpc_security_sem);
114 
115         printk(KERN_NOTICE "RxRPC: Unregistered security type %d '%s'\n",
116                sec->security_index, sec->name);
117 }
118 
119 EXPORT_SYMBOL_GPL(rxrpc_unregister_security);
120 
121 /*
122  * initialise the security on a client connection
123  */
124 int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
125 {
126         struct rxrpc_key_token *token;
127         struct rxrpc_security *sec;
128         struct key *key = conn->key;
129         int ret;
130 
131         _enter("{%d},{%x}", conn->debug_id, key_serial(key));
132 
133         if (!key)
134                 return 0;
135 
136         ret = key_validate(key);
137         if (ret < 0)
138                 return ret;
139 
140         if (!key->payload.data)
141                 return -EKEYREJECTED;
142         token = key->payload.data;
143 
144         sec = rxrpc_security_lookup(token->security_index);
145         if (!sec)
146                 return -EKEYREJECTED;
147         conn->security = sec;
148 
149         ret = conn->security->init_connection_security(conn);
150         if (ret < 0) {
151                 rxrpc_security_put(conn->security);
152                 conn->security = NULL;
153                 return ret;
154         }
155 
156         _leave(" = 0");
157         return 0;
158 }
159 
160 /*
161  * initialise the security on a server connection
162  */
163 int rxrpc_init_server_conn_security(struct rxrpc_connection *conn)
164 {
165         struct rxrpc_security *sec;
166         struct rxrpc_local *local = conn->trans->local;
167         struct rxrpc_sock *rx;
168         struct key *key;
169         key_ref_t kref;
170         char kdesc[5+1+3+1];
171 
172         _enter("");
173 
174         sprintf(kdesc, "%u:%u", ntohs(conn->service_id), conn->security_ix);
175 
176         sec = rxrpc_security_lookup(conn->security_ix);
177         if (!sec) {
178                 _leave(" = -ENOKEY [lookup]");
179                 return -ENOKEY;
180         }
181 
182         /* find the service */
183         read_lock_bh(&local->services_lock);
184         list_for_each_entry(rx, &local->services, listen_link) {
185                 if (rx->service_id == conn->service_id)
186                         goto found_service;
187         }
188 
189         /* the service appears to have died */
190         read_unlock_bh(&local->services_lock);
191         rxrpc_security_put(sec);
192         _leave(" = -ENOENT");
193         return -ENOENT;
194 
195 found_service:
196         if (!rx->securities) {
197                 read_unlock_bh(&local->services_lock);
198                 rxrpc_security_put(sec);
199                 _leave(" = -ENOKEY");
200                 return -ENOKEY;
201         }
202 
203         /* look through the service's keyring */
204         kref = keyring_search(make_key_ref(rx->securities, 1UL),
205                               &key_type_rxrpc_s, kdesc);
206         if (IS_ERR(kref)) {
207                 read_unlock_bh(&local->services_lock);
208                 rxrpc_security_put(sec);
209                 _leave(" = %ld [search]", PTR_ERR(kref));
210                 return PTR_ERR(kref);
211         }
212 
213         key = key_ref_to_ptr(kref);
214         read_unlock_bh(&local->services_lock);
215 
216         conn->server_key = key;
217         conn->security = sec;
218 
219         _leave(" = 0");
220         return 0;
221 }
222 
223 /*
224  * secure a packet prior to transmission
225  */
226 int rxrpc_secure_packet(const struct rxrpc_call *call,
227                         struct sk_buff *skb,
228                         size_t data_size,
229                         void *sechdr)
230 {
231         if (call->conn->security)
232                 return call->conn->security->secure_packet(
233                         call, skb, data_size, sechdr);
234         return 0;
235 }
236 
237 /*
238  * secure a packet prior to transmission
239  */
240 int rxrpc_verify_packet(const struct rxrpc_call *call, struct sk_buff *skb,
241                         u32 *_abort_code)
242 {
243         if (call->conn->security)
244                 return call->conn->security->verify_packet(
245                         call, skb, _abort_code);
246         return 0;
247 }
248 
249 /*
250  * clear connection security
251  */
252 void rxrpc_clear_conn_security(struct rxrpc_connection *conn)
253 {
254         _enter("{%d}", conn->debug_id);
255 
256         if (conn->security) {
257                 conn->security->clear(conn);
258                 rxrpc_security_put(conn->security);
259                 conn->security = NULL;
260         }
261 
262         key_put(conn->key);
263         key_put(conn->server_key);
264 }
265 

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