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         unsigned char machine_cred : 1;
  30 };
  31
  32 /*
  33  * Client user credentials
  34  */
  35 struct rpc_auth;
  36 struct rpc_credops;
  37 struct rpc_cred {
  38         struct hlist_node       cr_hash;        /* hash chain */
  39         struct list_head        cr_lru;         /* lru garbage collection */
  40         struct rcu_head         cr_rcu;
  41         struct rpc_auth *       cr_auth;
  42         const struct rpc_credops *cr_ops;
  43 #ifdef RPC_DEBUG
  44         unsigned long           cr_magic;       /* 0x0f4aa4f0 */
  45 #endif
  46         unsigned long           cr_expire;      /* when to gc */
  47         unsigned long           cr_flags;       /* various flags */
  48         atomic_t                cr_count;       /* ref count */
  49
  50         uid_t                   cr_uid;
  51
  52         /* per-flavor data */
  53 };
  54 #define RPCAUTH_CRED_NEW        0
  55 #define RPCAUTH_CRED_UPTODATE   1
  56 #define RPCAUTH_CRED_HASHED     2
  57
  58 #define RPCAUTH_CRED_MAGIC      0x0f4aa4f0
  59
  60 /*
  61  * Client authentication handle
  62  */
  63 #define RPC_CREDCACHE_HASHBITS  4
  64 #define RPC_CREDCACHE_NR        (1 << RPC_CREDCACHE_HASHBITS)
  65 struct rpc_cred_cache {
  66         struct hlist_head       hashtable[RPC_CREDCACHE_NR];
  67         spinlock_t              lock;
  68 };
  69
  70 struct rpc_authops;
  71 struct rpc_auth {
  72         unsigned int            au_cslack;      /* call cred size estimate */
  73                                 /* guess at number of u32's auth adds before
  74                                  * reply data; normally the verifier size: */
  75         unsigned int            au_rslack;
  76                                 /* for gss, used to calculate au_rslack: */
  77         unsigned int            au_verfsize;
  78
  79         unsigned int            au_flags;       /* various flags */
  80         const struct rpc_authops *au_ops;               /* operations */
  81         rpc_authflavor_t        au_flavor;      /* pseudoflavor (note may
  82                                                  * differ from the flavor in
  83                                                  * au_ops->au_flavor in gss
  84                                                  * case) */
  85         atomic_t                au_count;       /* Reference counter */
  86
  87         struct rpc_cred_cache * au_credcache;
  88         /* per-flavor data */
  89 };
  90
  91 /* Flags for rpcauth_lookupcred() */
  92 #define RPCAUTH_LOOKUP_NEW              0x01    /* Accept an uninitialised cred */
  93
  94 /*
  95  * Client authentication ops
  96  */
  97 struct rpc_authops {
  98         struct module           *owner;
  99         rpc_authflavor_t        au_flavor;      /* flavor (RPC_AUTH_*) */
 100         char *                  au_name;
 101         struct rpc_auth *       (*create)(struct rpc_clnt *, rpc_authflavor_t);
 102         void                    (*destroy)(struct rpc_auth *);
 103
 104         struct rpc_cred *       (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
 105         struct rpc_cred *       (*crcreate)(struct rpc_auth*, struct auth_cred *, int);
 106 };
 107
 108 struct rpc_credops {
 109         const char *            cr_name;        /* Name of the auth flavour */
 110         int                     (*cr_init)(struct rpc_auth *, struct rpc_cred *);
 111         void                    (*crdestroy)(struct rpc_cred *);
 112
 113         int                     (*crmatch)(struct auth_cred *, struct rpc_cred *, int);
 114         void                    (*crbind)(struct rpc_task *, struct rpc_cred *);
 115         __be32 *                (*crmarshal)(struct rpc_task *, __be32 *);
 116         int                     (*crrefresh)(struct rpc_task *);
 117         __be32 *                (*crvalidate)(struct rpc_task *, __be32 *);
 118         int                     (*crwrap_req)(struct rpc_task *, kxdrproc_t,
 119                                                 void *, __be32 *, void *);
 120         int                     (*crunwrap_resp)(struct rpc_task *, kxdrproc_t,
 121                                                 void *, __be32 *, void *);
 122 };
 123
 124 extern const struct rpc_authops authunix_ops;
 125 extern const struct rpc_authops authnull_ops;
 126
 127 void __init             rpc_init_authunix(void);
 128 void __init             rpc_init_generic_auth(void);
 129 void __init             rpcauth_init_module(void);
 130 void __exit             rpcauth_remove_module(void);
 131 void __exit             rpc_destroy_generic_auth(void);
 132
 133 struct rpc_cred *       rpc_lookup_cred(void);
 134 struct rpc_cred *       rpc_lookup_machine_cred(void);
 135 int                     rpcauth_register(const struct rpc_authops *);
 136 int                     rpcauth_unregister(const struct rpc_authops *);
 137 struct rpc_auth *       rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);
 138 void                    rpcauth_release(struct rpc_auth *);
 139 struct rpc_cred *       rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int);
 140 void                    rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
 141 struct rpc_cred *       rpcauth_lookupcred(struct rpc_auth *, int);
 142 void                    rpcauth_bindcred(struct rpc_task *, struct rpc_cred *, int);
 143 void                    rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *);
 144 void                    put_rpccred(struct rpc_cred *);
 145 void                    rpcauth_unbindcred(struct rpc_task *);
 146 __be32 *                rpcauth_marshcred(struct rpc_task *, __be32 *);
 147 __be32 *                rpcauth_checkverf(struct rpc_task *, __be32 *);
 148 int                     rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp, __be32 *data, void *obj);
 149 int                     rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp, __be32 *data, void *obj);
 150 int                     rpcauth_refreshcred(struct rpc_task *);
 151 void                    rpcauth_invalcred(struct rpc_task *);
 152 int                     rpcauth_uptodatecred(struct rpc_task *);
 153 int                     rpcauth_init_credcache(struct rpc_auth *);
 154 void                    rpcauth_destroy_credcache(struct rpc_auth *);
 155 void                    rpcauth_clear_credcache(struct rpc_cred_cache *);
 156
 157 static inline
 158 struct rpc_cred *       get_rpccred(struct rpc_cred *cred)
 159 {
 160         atomic_inc(&cred->cr_count);
 161         return cred;
 162 }
 163
 164 #endif /* __KERNEL__ */
 165 #endif /* _LINUX_SUNRPC_AUTH_H */