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 const struct rxrpc_security *rxrpc_security_types[] = { 23 [RXRPC_SECURITY_NONE] = &rxrpc_no_security, 24 #ifdef CONFIG_RXKAD 25 [RXRPC_SECURITY_RXKAD] = &rxkad, 26 #endif 27 }; 28 29 int __init rxrpc_init_security(void) 30 { 31 int i, ret; 32 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; 38 } 39 } 40 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; 48 } 49 50 void rxrpc_exit_security(void) 51 { 52 int i; 53 54 for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) 55 if (rxrpc_security_types[i]) 56 rxrpc_security_types[i]->exit(); 57 } 58 59 /* 60 * look up an rxrpc security module 61 */ 62 static const struct rxrpc_security *rxrpc_security_lookup(u8 security_index) 63 { 64 if (security_index >= ARRAY_SIZE(rxrpc_security_types)) 65 return NULL; 66 return rxrpc_security_types[security_index]; 67 } 68 69 /* 70 * initialise the security on a client connection 71 */ 72 int rxrpc_init_client_conn_security(struct rxrpc_connection *conn) 73 { 74 const struct rxrpc_security *sec; 75 struct rxrpc_key_token *token; 76 struct key *key = conn->params.key; 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 88 token = key->payload.data[0]; 89 if (!token) 90 return -EKEYREJECTED; 91 92 sec = rxrpc_security_lookup(token->security_index); 93 if (!sec) 94 return -EKEYREJECTED; 95 conn->security = sec; 96 97 ret = conn->security->init_connection_security(conn); 98 if (ret < 0) { 99 conn->security = &rxrpc_no_security; 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 { 112 const struct rxrpc_security *sec; 113 struct rxrpc_local *local = conn->params.local; 114 struct rxrpc_sock *rx; 115 struct key *key; 116 key_ref_t kref; 117 char kdesc[5 + 1 + 3 + 1]; 118 119 _enter(""); 120 121 sprintf(kdesc, "%u:%u", conn->service_id, conn->security_ix); 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 */ 130 read_lock(&local->services_lock); 131 rx = rcu_dereference_protected(local->service, 132 lockdep_is_held(&local->services_lock)); 133 if (rx && (rx->srx.srx_service == conn->service_id || 134 rx->second_service == conn->service_id)) 135 goto found_service; 136 137 /* the service appears to have died */ 138 read_unlock(&local->services_lock); 139 _leave(" = -ENOENT"); 140 return -ENOENT; 141 142 found_service: 143 if (!rx->securities) { 144 read_unlock(&local->services_lock); 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)) { 153 read_unlock(&local->services_lock); 154 _leave(" = %ld [search]", PTR_ERR(kref)); 155 return PTR_ERR(kref); 156 } 157 158 key = key_ref_to_ptr(kref); 159 read_unlock(&local->services_lock); 160 161 conn->server_key = key; 162 conn->security = sec; 163 164 _leave(" = 0"); 165 return 0; 166 } 167