net/rxrpc/insecure.c

   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  * Work out how much data we can put in an unsecured packet.
  19  */
  20 static int none_how_much_data(struct rxrpc_call *call, size_t remain,
  21                                size_t *_buf_size, size_t *_data_size, size_t *_offset)
  22 {
  23         *_buf_size = *_data_size = min_t(size_t, remain, RXRPC_JUMBO_DATALEN);
  24         *_offset = 0;
  25         return 0;
  26 }
  27
  28 static int none_secure_packet(struct rxrpc_call *call, struct sk_buff *skb,
  29                               size_t data_size)
  30 {
  31         return 0;
  32 }
  33
  34 static int none_verify_packet(struct rxrpc_call *call, struct sk_buff *skb,
  35                               unsigned int offset, unsigned int len,
  36                               rxrpc_seq_t seq, u16 expected_cksum)
  37 {
  38         return 0;
  39 }
  40
  41 static void none_free_call_crypto(struct rxrpc_call *call)
  42 {
  43 }
  44
  45 static void none_locate_data(struct rxrpc_call *call, struct sk_buff *skb,
  46                              unsigned int *_offset, unsigned int *_len)
  47 {
  48 }
  49
  50 static int none_respond_to_challenge(struct rxrpc_connection *conn,
  51                                      struct sk_buff *skb,
  52                                      u32 *_abort_code)
  53 {
  54         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
  55
  56         trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
  57                               tracepoint_string("chall_none"));
  58         return -EPROTO;
  59 }
  60
  61 static int none_verify_response(struct rxrpc_connection *conn,
  62                                 struct sk_buff *skb,
  63                                 u32 *_abort_code)
  64 {
  65         struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
  66
  67         trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
  68                               tracepoint_string("resp_none"));
  69         return -EPROTO;
  70 }
  71
  72 static void none_clear(struct rxrpc_connection *conn)
  73 {
  74 }
  75
  76 static int none_init(void)
  77 {
  78         return 0;
  79 }
  80
  81 static void none_exit(void)
  82 {
  83 }
  84
  85 /*
  86  * RxRPC Kerberos-based security
  87  */
  88 const struct rxrpc_security rxrpc_no_security = {
  89         .name                           = "none",
  90         .security_index                 = RXRPC_SECURITY_NONE,
  91         .init                           = none_init,
  92         .exit                           = none_exit,
  93         .init_connection_security       = none_init_connection_security,
  94         .free_call_crypto               = none_free_call_crypto,
  95         .how_much_data                  = none_how_much_data,
  96         .secure_packet                  = none_secure_packet,
  97         .verify_packet                  = none_verify_packet,
  98         .locate_data                    = none_locate_data,
  99         .respond_to_challenge           = none_respond_to_challenge,
 100         .verify_response                = none_verify_response,
 101         .clear                          = none_clear,
 102 };