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/sunrpc/sched.h>
  15 #include <linux/sunrpc/msg_prot.h>
  16 #include <linux/sunrpc/xdr.h>
  17
  18 #include <asm/atomic.h>
  19 #include <linux/rcupdate.h>
  20
  21 /* size of the nodename buffer */
  22 #define UNX_MAXNODENAME 32
  23
  24 /* Work around the lack of a VFS credential */
  25 struct auth_cred {
  26         uid_t   uid;
  27         gid_t   gid;
  28         struct group_info *group_info;
  29 };
  30
  31 /*
  32  * Client user credentials
  33  */
  34 struct rpc_auth;
  35 struct rpc_credops;
  36 struct rpc_cred {
  37         struct hlist_node       cr_hash;        /* hash chain */
  38         struct list_head        cr_lru;         /* lru garbage collection */
  39         struct rcu_head         cr_rcu;
  40         struct rpc_auth *       cr_auth;
  41         const struct rpc_credops *cr_ops;
  42 #ifdef RPC_DEBUG
  43         unsigned long           cr_magic;       /* 0x0f4aa4f0 */
  44 #endif
  45         unsigned long           cr_expire;      /* when to gc */
  46         unsigned long           cr_flags;       /* various flags */
  47         atomic_t                cr_count;       /* ref count */
  48
  49         uid_t                   cr_uid;
  50
  51         /* per-flavor data */
  52 };
  53 #define RPCAUTH_CRED_NEW        0
  54 #define RPCAUTH_CRED_UPTODATE   1
  55 #define RPCAUTH_CRED_HASHED     2
  56
  57 #define RPCAUTH_CRED_MAGIC      0x0f4aa4f0
  58
  59 /*
  60  * Client authentication handle
  61  */
  62 #define RPC_CREDCACHE_HASHBITS  4
  63 #define RPC_CREDCACHE_NR        (1 << RPC_CREDCACHE_HASHBITS)
  64 struct rpc_cred_cache {
  65         struct hlist_head       hashtable[RPC_CREDCACHE_NR];
  66         spinlock_t              lock;
  67 };
  68
  69 struct rpc_authops;
  70 struct rpc_auth {
  71         unsigned int            au_cslack;      /* call cred size estimate */
  72                                 /* guess at number of u32's auth adds before
  73                                  * reply data; normally the verifier size: */
  74         unsigned int            au_rslack;
  75                                 /* for gss, used to calculate au_rslack: */
  76         unsigned int            au_verfsize;
  77
  78         unsigned int            au_flags;       /* various flags */
  79         const struct rpc_authops *au_ops;               /* operations */
  80         rpc_authflavor_t        au_flavor;      /* pseudoflavor (note may
  81                                                  * differ from the flavor in
  82                                                  * au_ops->au_flavor in gss
  83                                                  * case) */
  84         atomic_t                au_count;       /* Reference counter */
  85
  86         struct rpc_cred_cache * au_credcache;
  87         /* per-flavor data */
  88 };
  89
  90 /* Flags for rpcauth_lookupcred() */
  91 #define RPCAUTH_LOOKUP_NEW              0x01    /* Accept an uninitialised cred */
  92
  93 /*
  94  * Client authentication ops
  95  */
  96 struct rpc_authops {
  97         struct module           *owner;
  98         rpc_authflavor_t        au_flavor;      /* flavor (RPC_AUTH_*) */
  99         char *                  au_name;
 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         void                    (*crbind)(struct rpc_task *, struct rpc_cred *);
 114         __be32 *                (*crmarshal)(struct rpc_task *, __be32 *);
 115         int                     (*crrefresh)(struct rpc_task *);
 116         __be32 *                (*crvalidate)(struct rpc_task *, __be32 *);
 117         int                     (*crwrap_req)(struct rpc_task *, kxdrproc_t,
 118                                                 void *, __be32 *, void *);
 119         int                     (*crunwrap_resp)(struct rpc_task *, kxdrproc_t,
 120                                                 void *, __be32 *, void *);
 121 };
 122
 123 extern const struct rpc_authops authunix_ops;
 124 extern const struct rpc_authops authnull_ops;
 125
 126 void __init             rpc_init_authunix(void);
 127 void __init             rpc_init_generic_auth(void);
 128 void __init             rpcauth_init_module(void);
 129 void __exit             rpcauth_remove_module(void);
 130 void __exit             rpc_destroy_generic_auth(void);
 131
 132 struct rpc_cred *       rpc_lookup_cred(void);
 133 int                     rpcauth_register(const struct rpc_authops *);
 134 int                     rpcauth_unregister(const struct rpc_authops *);
 135 struct rpc_auth *       rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);
 136 void                    rpcauth_release(struct rpc_auth *);
 137 struct rpc_cred *       rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int);
 138 void                    rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
 139 struct rpc_cred *       rpcauth_lookupcred(struct rpc_auth *, int);
 140 void                    rpcauth_bindcred(struct rpc_task *, struct rpc_cred *, int);
 141 void                    rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *);
 142 void                    put_rpccred(struct rpc_cred *);
 143 void                    rpcauth_unbindcred(struct rpc_task *);
 144 __be32 *                rpcauth_marshcred(struct rpc_task *, __be32 *);
 145 __be32 *                rpcauth_checkverf(struct rpc_task *, __be32 *);
 146 int                     rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp, __be32 *data, void *obj);
 147 int                     rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp, __be32 *data, void *obj);
 148 int                     rpcauth_refreshcred(struct rpc_task *);
 149 void                    rpcauth_invalcred(struct rpc_task *);
 150 int                     rpcauth_uptodatecred(struct rpc_task *);
 151 int                     rpcauth_init_credcache(struct rpc_auth *);
 152 void                    rpcauth_destroy_credcache(struct rpc_auth *);
 153 void                    rpcauth_clear_credcache(struct rpc_cred_cache *);
 154
 155 static inline
 156 struct rpc_cred *       get_rpccred(struct rpc_cred *cred)
 157 {
 158         atomic_inc(&cred->cr_count);
 159         return cred;
 160 }
 161
 162 #endif /* __KERNEL__ */
 163 #endif /* _LINUX_SUNRPC_AUTH_H */