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 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 call. 67 */ 68 int rxrpc_init_client_call_security(struct rxrpc_call *call) 69 { 70 const struct rxrpc_security *sec = &rxrpc_no_security; 71 struct rxrpc_key_token *token; 72 struct key *key = call->key; 73 int ret; 74 75 if (!key) 76 goto found; 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; 91 call->security_ix = sec->security_index; 92 return 0; 93 } 94 95 /* 96 * initialise the security on a client connection 97 */ 98 int rxrpc_init_client_conn_security(struct rxrpc_connection *conn) 99 { 100 const struct rxrpc_security *sec; 101 struct rxrpc_key_token *token; 102 struct key *key = conn->key; 103 int ret; 104 105 _enter("{%d},{%x}", conn->debug_id, key_serial(key)); 106 107 if (!key) 108 return 0; 109 110 ret = key_validate(key); 111 if (ret < 0) 112 return ret; 113 114 for (token = key->payload.data[0]; token; token = token->next) { 115 sec = rxrpc_security_lookup(token->security_index); 116 if (sec) 117 goto found; 118 } 119 return -EKEYREJECTED; 120 121 found: 122 conn->security = sec; 123 124 ret = conn->security->init_connection_security(conn, token); 125 if (ret < 0) { 126 conn->security = &rxrpc_no_security; 127 return ret; 128 } 129 130 _leave(" = 0"); 131 return 0; 132 } 133 134 /* 135 * Set the ops a server connection. 136 */ 137 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *rx, 138 struct sk_buff *skb) 139 { 140 const struct rxrpc_security *sec; 141 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 142 143 _enter(""); 144 145 sec = rxrpc_security_lookup(sp->hdr.securityIndex); 146 if (!sec) { 147 trace_rxrpc_abort(0, "SVS", 148 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, 149 RX_INVALID_OPERATION, EKEYREJECTED); 150 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; 151 skb->priority = RX_INVALID_OPERATION; 152 return NULL; 153 } 154 155 if (sp->hdr.securityIndex != RXRPC_SECURITY_NONE && 156 !rx->securities) { 157 trace_rxrpc_abort(0, "SVR", 158 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, 159 RX_INVALID_OPERATION, EKEYREJECTED); 160 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; 161 skb->priority = sec->no_key_abort; 162 return NULL; 163 } 164 165 return sec; 166 } 167 168 /* 169 * Find the security key for a server connection. 170 */ 171 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *conn, 172 struct sk_buff *skb, 173 u32 kvno, u32 enctype) 174 { 175 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 176 struct rxrpc_sock *rx; 177 struct key *key = ERR_PTR(-EKEYREJECTED); 178 key_ref_t kref = NULL; 179 char kdesc[5 + 1 + 3 + 1 + 12 + 1 + 12 + 1]; 180 int ret; 181 182 _enter(""); 183 184 if (enctype) 185 sprintf(kdesc, "%u:%u:%u:%u", 186 sp->hdr.serviceId, sp->hdr.securityIndex, kvno, enctype); 187 else if (kvno) 188 sprintf(kdesc, "%u:%u:%u", 189 sp->hdr.serviceId, sp->hdr.securityIndex, kvno); 190 else 191 sprintf(kdesc, "%u:%u", 192 sp->hdr.serviceId, sp->hdr.securityIndex); 193 194 rcu_read_lock(); 195 196 rx = rcu_dereference(conn->local->service); 197 if (!rx) 198 goto out; 199 200 /* look through the service's keyring */ 201 kref = keyring_search(make_key_ref(rx->securities, 1UL), 202 &key_type_rxrpc_s, kdesc, true); 203 if (IS_ERR(kref)) { 204 key = ERR_CAST(kref); 205 goto out; 206 } 207 208 key = key_ref_to_ptr(kref); 209 210 ret = key_validate(key); 211 if (ret < 0) { 212 key_put(key); 213 key = ERR_PTR(ret); 214 goto out; 215 } 216 217 out: 218 rcu_read_unlock(); 219 return key; 220 } 221