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 18static 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 25int __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 39failed: 40 for (i--; i >= 0; i--) 41 if (rxrpc_security_types[i]) 42 rxrpc_security_types[i]->exit(); 43 return ret; 44} 45 46void 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 */ 58static 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 */ 68int 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 * Find the security key for a server connection. 105 */ 106bool rxrpc_look_up_server_security(struct rxrpc_local *local, struct rxrpc_sock *rx, 107 const struct rxrpc_security **_sec, 108 struct key **_key, 109 struct sk_buff *skb) 110{ 111 const struct rxrpc_security *sec; 112 struct rxrpc_skb_priv *sp = rxrpc_skb(skb); 113 key_ref_t kref = NULL; 114 char kdesc[5 + 1 + 3 + 1]; 115 116 _enter(""); 117 118 sprintf(kdesc, "%u:%u", sp->hdr.serviceId, sp->hdr.securityIndex); 119 120 sec = rxrpc_security_lookup(sp->hdr.securityIndex); 121 if (!sec) { 122 trace_rxrpc_abort(0, "SVS", 123 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, 124 RX_INVALID_OPERATION, EKEYREJECTED); 125 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; 126 skb->priority = RX_INVALID_OPERATION; 127 return false; 128 } 129 130 if (sp->hdr.securityIndex == RXRPC_SECURITY_NONE) 131 goto out; 132 133 if (!rx->securities) { 134 trace_rxrpc_abort(0, "SVR", 135 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, 136 RX_INVALID_OPERATION, EKEYREJECTED); 137 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; 138 skb->priority = RX_INVALID_OPERATION; 139 return false; 140 } 141 142 /* look through the service's keyring */ 143 kref = keyring_search(make_key_ref(rx->securities, 1UL), 144 &key_type_rxrpc_s, kdesc, true); 145 if (IS_ERR(kref)) { 146 trace_rxrpc_abort(0, "SVK", 147 sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, 148 sec->no_key_abort, EKEYREJECTED); 149 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; 150 skb->priority = sec->no_key_abort; 151 return false; 152 } 153 154out: 155 *_sec = sec; 156 *_key = key_ref_to_ptr(kref); 157 return true; 158} 159