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[0];              /* the encrypted ticket */
  32 };
  33
  34 /*
  35  * Kerberos 5 principal
  36  *      name/name/name@realm
  37  */
  38 struct krb5_principal {
  39         u8      n_name_parts;           /* N of parts of the name part of the principal */
  40         char    **name_parts;           /* parts of the name part of the principal */
  41         char    *realm;                 /* parts of the realm part of the principal */
  42 };
  43
  44 /*
  45  * Kerberos 5 tagged data
  46  */
  47 struct krb5_tagged_data {
  48         /* for tag value, see /usr/include/krb5/krb5.h
  49          * - KRB5_AUTHDATA_* for auth data
  50          * -
  51          */
  52         s32             tag;
  53         u32             data_len;
  54         u8              *data;
  55 };
  56
  57 /*
  58  * RxRPC key for Kerberos V (type-5 security)
  59  */
  60 struct rxk5_key {
  61         u64                     authtime;       /* time at which auth token generated */
  62         u64                     starttime;      /* time at which auth token starts */
  63         u64                     endtime;        /* time at which auth token expired */
  64         u64                     renew_till;     /* time to which auth token can be renewed */
  65         s32                     is_skey;        /* T if ticket is encrypted in another ticket's
  66                                                  * skey */
  67         s32                     flags;          /* mask of TKT_FLG_* bits (krb5/krb5.h) */
  68         struct krb5_principal   client;         /* client principal name */
  69         struct krb5_principal   server;         /* server principal name */
  70         u16                     ticket_len;     /* length of ticket */
  71         u16                     ticket2_len;    /* length of second ticket */
  72         u8                      n_authdata;     /* number of authorisation data elements */
  73         u8                      n_addresses;    /* number of addresses */
  74         struct krb5_tagged_data session;        /* session data; tag is enctype */
  75         struct krb5_tagged_data *addresses;     /* addresses */
  76         u8                      *ticket;        /* krb5 ticket */
  77         u8                      *ticket2;       /* second krb5 ticket, if related to ticket (via
  78                                                  * DUPLICATE-SKEY or ENC-TKT-IN-SKEY) */
  79         struct krb5_tagged_data *authdata;      /* authorisation data */
  80 };
  81
  82 /*
  83  * list of tokens attached to an rxrpc key
  84  */
  85 struct rxrpc_key_token {
  86         u16     security_index;         /* RxRPC header security index */
  87         struct rxrpc_key_token *next;   /* the next token in the list */
  88         union {
  89                 struct rxkad_key *kad;
  90                 struct rxk5_key *k5;
  91         };
  92 };
  93
  94 /*
  95  * structure of raw payloads passed to add_key() or instantiate key
  96  */
  97 struct rxrpc_key_data_v1 {
  98         u16             security_index;
  99         u16             ticket_length;
 100         u32             expiry;                 /* time_t */
 101         u32             kvno;
 102         u8              session_key[8];
 103         u8              ticket[0];
 104 };
 105
 106 /*
 107  * AF_RXRPC key payload derived from XDR format
 108  * - based on openafs-1.4.10/src/auth/afs_token.xg
 109  */
 110 #define AFSTOKEN_LENGTH_MAX             16384   /* max payload size */
 111 #define AFSTOKEN_STRING_MAX             256     /* max small string length */
 112 #define AFSTOKEN_DATA_MAX               64      /* max small data length */
 113 #define AFSTOKEN_CELL_MAX               64      /* max cellname length */
 114 #define AFSTOKEN_MAX                    8       /* max tokens per payload */
 115 #define AFSTOKEN_BDATALN_MAX            16384   /* max big data length */
 116 #define AFSTOKEN_RK_TIX_MAX             12000   /* max RxKAD ticket size */
 117 #define AFSTOKEN_GK_KEY_MAX             64      /* max GSSAPI key size */
 118 #define AFSTOKEN_GK_TOKEN_MAX           16384   /* max GSSAPI token size */
 119 #define AFSTOKEN_K5_COMPONENTS_MAX      16      /* max K5 components */
 120 #define AFSTOKEN_K5_NAME_MAX            128     /* max K5 name length */
 121 #define AFSTOKEN_K5_REALM_MAX           64      /* max K5 realm name length */
 122 #define AFSTOKEN_K5_TIX_MAX             16384   /* max K5 ticket size */
 123 #define AFSTOKEN_K5_ADDRESSES_MAX       16      /* max K5 addresses */
 124 #define AFSTOKEN_K5_AUTHDATA_MAX        16      /* max K5 pieces of auth data */
 125
 126 /*
 127  * Truncate a time64_t to the range from 1970 to 2106 as in the network
 128  * protocol.
 129  */
 130 static inline u32 rxrpc_time64_to_u32(time64_t time)
 131 {
 132         if (time < 0)
 133                 return 0;
 134
 135         if (time > UINT_MAX)
 136                 return UINT_MAX;
 137
 138         return (u32)time;
 139 }
 140
 141 /*
 142  * Extend u32 back to time64_t using the same 1970-2106 range.
 143  */
 144 static inline time64_t rxrpc_u32_to_time64(u32 time)
 145 {
 146         return (time64_t)time;
 147 }
 148
 149 #endif /* _KEYS_RXRPC_TYPE_H */