include/keys/rxrpc-type.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* RxRPC key type
   3  *
   4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 #ifndef _KEYS_RXRPC_TYPE_H
   9 #define _KEYS_RXRPC_TYPE_H
  10
  11 #include <linux/key.h>
  12
  13 /*
  14  * key type for AF_RXRPC keys
  15  */
  16 extern struct key_type key_type_rxrpc;
  17
  18 extern struct key *rxrpc_get_null_key(const char *);
  19
  20 /*
  21  * RxRPC key for Kerberos IV (type-2 security)
  22  */
  23 struct rxkad_key {
  24         u32     vice_id;
  25         u32     start;                  /* time at which ticket starts */
  26         u32     expiry;                 /* time at which ticket expires */
  27         u32     kvno;                   /* key version number */
  28         u8      primary_flag;           /* T if key for primary cell for this user */
  29         u16     ticket_len;             /* length of ticket[] */
  30         u8      session_key[8];         /* DES session key */
  31         u8      ticket[];               /* the encrypted ticket */
  32 };
  33
  34 /*
  35  * list of tokens attached to an rxrpc key
  36  */
  37 struct rxrpc_key_token {
  38         u16     security_index;         /* RxRPC header security index */
  39         bool    no_leak_key;            /* Don't copy the key to userspace */
  40         struct rxrpc_key_token *next;   /* the next token in the list */
  41         union {
  42                 struct rxkad_key *kad;
  43         };
  44 };
  45
  46 /*
  47  * structure of raw payloads passed to add_key() or instantiate key
  48  */
  49 struct rxrpc_key_data_v1 {
  50         u16             security_index;
  51         u16             ticket_length;
  52         u32             expiry;                 /* time_t */
  53         u32             kvno;
  54         u8              session_key[8];
  55         u8              ticket[];
  56 };
  57
  58 /*
  59  * AF_RXRPC key payload derived from XDR format
  60  * - based on openafs-1.4.10/src/auth/afs_token.xg
  61  */
  62 #define AFSTOKEN_LENGTH_MAX             16384   /* max payload size */
  63 #define AFSTOKEN_STRING_MAX             256     /* max small string length */
  64 #define AFSTOKEN_DATA_MAX               64      /* max small data length */
  65 #define AFSTOKEN_CELL_MAX               64      /* max cellname length */
  66 #define AFSTOKEN_MAX                    8       /* max tokens per payload */
  67 #define AFSTOKEN_BDATALN_MAX            16384   /* max big data length */
  68 #define AFSTOKEN_RK_TIX_MAX             12000   /* max RxKAD ticket size */
  69 #define AFSTOKEN_GK_KEY_MAX             64      /* max GSSAPI key size */
  70 #define AFSTOKEN_GK_TOKEN_MAX           16384   /* max GSSAPI token size */
  71
  72 /*
  73  * Truncate a time64_t to the range from 1970 to 2106 as in the network
  74  * protocol.
  75  */
  76 static inline u32 rxrpc_time64_to_u32(time64_t time)
  77 {
  78         if (time < 0)
  79                 return 0;
  80
  81         if (time > UINT_MAX)
  82                 return UINT_MAX;
  83
  84         return (u32)time;
  85 }
  86
  87 /*
  88  * Extend u32 back to time64_t using the same 1970-2106 range.
  89  */
  90 static inline time64_t rxrpc_u32_to_time64(u32 time)
  91 {
  92         return (time64_t)time;
  93 }
  94
  95 #endif /* _KEYS_RXRPC_TYPE_H */