1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* RxRPC security handling 3 * 4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 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> 15 #include <keys/rxrpc-type.h> 16 #include "ar-internal.h" 17 18 static const struct rxrpc_security *rxrpc_security_types[] = { 19 [RXRPC_SECURITY_NONE] = &rxrpc_no_security, 20 #ifdef CONFIG_RXKAD 21 [RXRPC_SECURITY_RXKAD] = &rxkad, 22 #endif 23 }; 24 25 int __init rxrpc_init_security(void) 26 { 27 int i, ret; 28 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; 34 } 35 } 36 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; 44 } 45 46 void rxrpc_exit_security(void) 47 { 48 int i; 49 50 for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) 51 if (rxrpc_security_types[i]) 52 rxrpc_security_types[i]->exit(); 53 } 54 55 /* 56 * look up an rxrpc security module 57 */ 58 static const struct rxrpc_security *rxrpc_security_lookup(u8 security_index) 59 { 60 if (security_index >= ARRAY_SIZE(rxrpc_security_types)) 61 return NULL; 62 return rxrpc_security_types[security_index]; 63 } 64 65 /* 66 * initialise the security on a client connection 67 */ 68 int rxrpc_init_client_conn_security(struct rxrpc_connection *conn) 69 { 70 const struct rxrpc_security *sec; 71 struct rxrpc_key_token *token; 72 struct key *key = conn->params.key; 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 84 token = key->payload.data[0]; 85 if (!token) 86 return -EKEYREJECTED; 87 88 sec = rxrpc_security_lookup(token->security_index); 89 if (!sec) 90 return -EKEYREJECTED; 91 conn->security = sec; 92 93 ret = conn->security->init_connection_security(conn); 94 if (ret < 0) { 95 conn->security = &rxrpc_no_security; 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 { 108 const struct rxrpc_security *sec; 109 struct rxrpc_local *local = conn->params.local; 110 struct rxrpc_sock *rx; 111 struct key *key; 112 key_ref_t kref; 113 char kdesc[5 + 1 + 3 + 1]; 114 115 _enter(""); 116 117 sprintf(kdesc, "%u:%u", conn->service_id, conn->security_ix); 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 */ 126 read_lock(&local->services_lock); 127 rx = rcu_dereference_protected(local->service, 128 lockdep_is_held(&local->services_lock)); 129 if (rx && (rx->srx.srx_service == conn->service_id || 130 rx->second_service == conn->service_id)) 131 goto found_service; 132 133 /* the service appears to have died */ 134 read_unlock(&local->services_lock); 135 _leave(" = -ENOENT"); 136 return -ENOENT; 137 138 found_service: 139 if (!rx->securities) { 140 read_unlock(&local->services_lock); 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), 147 &key_type_rxrpc_s, kdesc); 148 if (IS_ERR(kref)) { 149 read_unlock(&local->services_lock); 150 _leave(" = %ld [search]", PTR_ERR(kref)); 151 return PTR_ERR(kref); 152 } 153 154 key = key_ref_to_ptr(kref); 155 read_unlock(&local->services_lock); 156 157 conn->server_key = key; 158 conn->security = sec; 159 160 _leave(" = 0"); 161 return 0; 162 } 163