include/linux/sunrpc/auth.h

   1 /*
   2  * linux/include/linux/sunrpc/auth.h
   3  *
   4  * Declarations for the RPC client authentication machinery.
   5  *
   6  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #ifndef _LINUX_SUNRPC_AUTH_H
  10 #define _LINUX_SUNRPC_AUTH_H
  11
  12 #ifdef __KERNEL__
  13
  14 #include <linux/config.h>
  15 #include <linux/sunrpc/sched.h>
  16 #include <linux/sunrpc/msg_prot.h>
  17 #include <linux/sunrpc/xdr.h>
  18
  19 #include <asm/atomic.h>
  20
  21 /* size of the nodename buffer */
  22 #define UNX_MAXNODENAME 32
  23
  24 /* Maximum size (in bytes) of an rpc credential or verifier */
  25 #define RPC_MAX_AUTH_SIZE (400)
  26
  27 /* Work around the lack of a VFS credential */
  28 struct auth_cred {
  29         uid_t   uid;
  30         gid_t   gid;
  31         struct group_info *group_info;
  32 };
  33
  34 /*
  35  * Client user credentials
  36  */
  37 struct rpc_cred {
  38         struct hlist_node       cr_hash;        /* hash chain */
  39         struct rpc_credops *    cr_ops;
  40         unsigned long           cr_expire;      /* when to gc */
  41         atomic_t                cr_count;       /* ref count */
  42         unsigned short          cr_flags;       /* various flags */
  43 #ifdef RPC_DEBUG
  44         unsigned long           cr_magic;       /* 0x0f4aa4f0 */
  45 #endif
  46
  47         uid_t                   cr_uid;
  48
  49         /* per-flavor data */
  50 };
  51 #define RPCAUTH_CRED_NEW        0x0001
  52 #define RPCAUTH_CRED_UPTODATE   0x0002
  53
  54 #define RPCAUTH_CRED_MAGIC      0x0f4aa4f0
  55
  56 /*
  57  * Client authentication handle
  58  */
  59 #define RPC_CREDCACHE_NR        8
  60 #define RPC_CREDCACHE_MASK      (RPC_CREDCACHE_NR - 1)
  61 struct rpc_cred_cache {
  62         struct hlist_head       hashtable[RPC_CREDCACHE_NR];
  63         unsigned long           nextgc;         /* next garbage collection */
  64         unsigned long           expire;         /* cache expiry interval */
  65 };
  66
  67 struct rpc_auth {
  68         unsigned int            au_cslack;      /* call cred size estimate */
  69                                 /* guess at number of u32's auth adds before
  70                                  * reply data; normally the verifier size: */
  71         unsigned int            au_rslack;
  72                                 /* for gss, used to calculate au_rslack: */
  73         unsigned int            au_verfsize;
  74
  75         unsigned int            au_flags;       /* various flags */
  76         struct rpc_authops *    au_ops;         /* operations */
  77         rpc_authflavor_t        au_flavor;      /* pseudoflavor (note may
  78                                                  * differ from the flavor in
  79                                                  * au_ops->au_flavor in gss
  80                                                  * case) */
  81         atomic_t                au_count;       /* Reference counter */
  82
  83         struct rpc_cred_cache * au_credcache;
  84         /* per-flavor data */
  85 };
  86
  87 /* Flags for rpcauth_lookupcred() */
  88 #define RPCAUTH_LOOKUP_NEW              0x01    /* Accept an uninitialised cred */
  89 #define RPCAUTH_LOOKUP_ROOTCREDS        0x02    /* This really ought to go! */
  90
  91 /*
  92  * Client authentication ops
  93  */
  94 struct rpc_authops {
  95         struct module           *owner;
  96         rpc_authflavor_t        au_flavor;      /* flavor (RPC_AUTH_*) */
  97 #ifdef RPC_DEBUG
  98         char *                  au_name;
  99 #endif
 100         struct rpc_auth *       (*create)(struct rpc_clnt *, rpc_authflavor_t);
 101         void                    (*destroy)(struct rpc_auth *);
 102
 103         struct rpc_cred *       (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
 104         struct rpc_cred *       (*crcreate)(struct rpc_auth*, struct auth_cred *, int);
 105 };
 106
 107 struct rpc_credops {
 108         const char *            cr_name;        /* Name of the auth flavour */
 109         int                     (*cr_init)(struct rpc_auth *, struct rpc_cred *);
 110         void                    (*crdestroy)(struct rpc_cred *);
 111
 112         int                     (*crmatch)(struct auth_cred *, struct rpc_cred *, int);
 113         u32 *                   (*crmarshal)(struct rpc_task *, u32 *);
 114         int                     (*crrefresh)(struct rpc_task *);
 115         u32 *                   (*crvalidate)(struct rpc_task *, u32 *);
 116         int                     (*crwrap_req)(struct rpc_task *, kxdrproc_t,
 117                                                 void *, u32 *, void *);
 118         int                     (*crunwrap_resp)(struct rpc_task *, kxdrproc_t,
 119                                                 void *, u32 *, void *);
 120 };
 121
 122 extern struct rpc_authops       authunix_ops;
 123 extern struct rpc_authops       authnull_ops;
 124 #ifdef CONFIG_SUNRPC_SECURE
 125 extern struct rpc_authops       authdes_ops;
 126 #endif
 127
 128 int                     rpcauth_register(struct rpc_authops *);
 129 int                     rpcauth_unregister(struct rpc_authops *);
 130 struct rpc_auth *       rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);
 131 void                    rpcauth_destroy(struct rpc_auth *);
 132 struct rpc_cred *       rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int);
 133 struct rpc_cred *       rpcauth_lookupcred(struct rpc_auth *, int);
 134 struct rpc_cred *       rpcauth_bindcred(struct rpc_task *);
 135 void                    rpcauth_holdcred(struct rpc_task *);
 136 void                    put_rpccred(struct rpc_cred *);
 137 void                    rpcauth_unbindcred(struct rpc_task *);
 138 u32 *                   rpcauth_marshcred(struct rpc_task *, u32 *);
 139 u32 *                   rpcauth_checkverf(struct rpc_task *, u32 *);
 140 int                     rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp, u32 *data, void *obj);
 141 int                     rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp, u32 *data, void *obj);
 142 int                     rpcauth_refreshcred(struct rpc_task *);
 143 void                    rpcauth_invalcred(struct rpc_task *);
 144 int                     rpcauth_uptodatecred(struct rpc_task *);
 145 int                     rpcauth_init_credcache(struct rpc_auth *, unsigned long);
 146 void                    rpcauth_free_credcache(struct rpc_auth *);
 147
 148 static inline
 149 struct rpc_cred *       get_rpccred(struct rpc_cred *cred)
 150 {
 151         atomic_inc(&cred->cr_count);
 152         return cred;
 153 }
 154
 155 #endif /* __KERNEL__ */
 156 #endif /* _LINUX_SUNRPC_AUTH_H */