1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Null security operations.
3  *
4  * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
5  * Written by David Howells (dhowells@redhat.com)
6  */
7 
8 #include <net/af_rxrpc.h>
9 #include "ar-internal.h"
10 
11 static int none_init_connection_security(struct rxrpc_connection *conn,
12 					 struct rxrpc_key_token *token)
13 {
14 	return 0;
15 }
16 
17 /*
18  * Allocate an appropriately sized buffer for the amount of data remaining.
19  */
20 static struct rxrpc_txbuf *none_alloc_txbuf(struct rxrpc_call *call, size_t remain, gfp_t gfp)
21 {
22 	return rxrpc_alloc_data_txbuf(call, umin(remain, RXRPC_JUMBO_DATALEN), 1, gfp);
23 }
24 
25 static int none_secure_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb)
26 {
27 	txb->pkt_len = txb->len;
28 	if (txb->len == RXRPC_JUMBO_DATALEN)
29 		txb->jumboable = true;
30 	return 0;
31 }
32 
33 static int none_verify_packet(struct rxrpc_call *call, struct sk_buff *skb)
34 {
35 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
36 
37 	sp->flags |= RXRPC_RX_VERIFIED;
38 	return 0;
39 }
40 
41 static void none_free_call_crypto(struct rxrpc_call *call)
42 {
43 }
44 
45 static bool none_validate_challenge(struct rxrpc_connection *conn,
46 				    struct sk_buff *skb)
47 {
48 	rxrpc_abort_conn(conn, skb, RX_PROTOCOL_ERROR, -EPROTO,
49 			 rxrpc_eproto_rxnull_challenge);
50 	return true;
51 }
52 
53 static int none_sendmsg_respond_to_challenge(struct sk_buff *challenge,
54 					     struct msghdr *msg)
55 {
56 	return -EINVAL;
57 }
58 
59 static int none_verify_response(struct rxrpc_connection *conn,
60 				struct sk_buff *skb)
61 {
62 	return rxrpc_abort_conn(conn, skb, RX_PROTOCOL_ERROR, -EPROTO,
63 				rxrpc_eproto_rxnull_response);
64 }
65 
66 static void none_clear(struct rxrpc_connection *conn)
67 {
68 }
69 
70 static int none_init(void)
71 {
72 	return 0;
73 }
74 
75 static void none_exit(void)
76 {
77 }
78 
79 /*
80  * RxRPC Kerberos-based security
81  */
82 const struct rxrpc_security rxrpc_no_security = {
83 	.name				= "none",
84 	.security_index			= RXRPC_SECURITY_NONE,
85 	.init				= none_init,
86 	.exit				= none_exit,
87 	.init_connection_security	= none_init_connection_security,
88 	.free_call_crypto		= none_free_call_crypto,
89 	.alloc_txbuf			= none_alloc_txbuf,
90 	.secure_packet			= none_secure_packet,
91 	.verify_packet			= none_verify_packet,
92 	.validate_challenge		= none_validate_challenge,
93 	.sendmsg_respond_to_challenge	= none_sendmsg_respond_to_challenge,
94 	.verify_response		= none_verify_response,
95 	.clear				= none_clear,
96 };
97