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 <linux/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         const char *principal;
  30         unsigned char machine_cred : 1;
  31 };
  32
  33 /*
  34  * Client user credentials
  35  */
  36 struct rpc_auth;
  37 struct rpc_credops;
  38 struct rpc_cred {
  39         struct hlist_node       cr_hash;        /* hash chain */
  40         struct list_head        cr_lru;         /* lru garbage collection */
  41         struct rcu_head         cr_rcu;
  42         struct rpc_auth *       cr_auth;
  43         const struct rpc_credops *cr_ops;
  44 #ifdef RPC_DEBUG
  45         unsigned long           cr_magic;       /* 0x0f4aa4f0 */
  46 #endif
  47         unsigned long           cr_expire;      /* when to gc */
  48         unsigned long           cr_flags;       /* various flags */
  49         atomic_t                cr_count;       /* ref count */
  50
  51         uid_t                   cr_uid;
  52
  53         /* per-flavor data */
  54 };
  55 #define RPCAUTH_CRED_NEW        0
  56 #define RPCAUTH_CRED_UPTODATE   1
  57 #define RPCAUTH_CRED_HASHED     2
  58 #define RPCAUTH_CRED_NEGATIVE   3
  59
  60 #define RPCAUTH_CRED_MAGIC      0x0f4aa4f0
  61
  62 /*
  63  * Client authentication handle
  64  */
  65 struct rpc_cred_cache;
  66 struct rpc_authops;
  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         const 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
  90 /*
  91  * Client authentication ops
  92  */
  93 struct rpc_authops {
  94         struct module           *owner;
  95         rpc_authflavor_t        au_flavor;      /* flavor (RPC_AUTH_*) */
  96         char *                  au_name;
  97         struct rpc_auth *       (*create)(struct rpc_clnt *, rpc_authflavor_t);
  98         void                    (*destroy)(struct rpc_auth *);
  99
 100         struct rpc_cred *       (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
 101         struct rpc_cred *       (*crcreate)(struct rpc_auth*, struct auth_cred *, int);
 102 };
 103
 104 struct rpc_credops {
 105         const char *            cr_name;        /* Name of the auth flavour */
 106         int                     (*cr_init)(struct rpc_auth *, struct rpc_cred *);
 107         void                    (*crdestroy)(struct rpc_cred *);
 108
 109         int                     (*crmatch)(struct auth_cred *, struct rpc_cred *, int);
 110         struct rpc_cred *       (*crbind)(struct rpc_task *, struct rpc_cred *, int);
 111         __be32 *                (*crmarshal)(struct rpc_task *, __be32 *);
 112         int                     (*crrefresh)(struct rpc_task *);
 113         __be32 *                (*crvalidate)(struct rpc_task *, __be32 *);
 114         int                     (*crwrap_req)(struct rpc_task *, kxdreproc_t,
 115                                                 void *, __be32 *, void *);
 116         int                     (*crunwrap_resp)(struct rpc_task *, kxdrdproc_t,
 117                                                 void *, __be32 *, void *);
 118 };
 119
 120 extern const struct rpc_authops authunix_ops;
 121 extern const struct rpc_authops authnull_ops;
 122
 123 int __init              rpc_init_authunix(void);
 124 int __init              rpc_init_generic_auth(void);
 125 int __init              rpcauth_init_module(void);
 126 void                    rpcauth_remove_module(void);
 127 void                    rpc_destroy_generic_auth(void);
 128 void                    rpc_destroy_authunix(void);
 129
 130 struct rpc_cred *       rpc_lookup_cred(void);
 131 struct rpc_cred *       rpc_lookup_machine_cred(const char *service_name);
 132 int                     rpcauth_register(const struct rpc_authops *);
 133 int                     rpcauth_unregister(const struct rpc_authops *);
 134 struct rpc_auth *       rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);
 135 void                    rpcauth_release(struct rpc_auth *);
 136 struct rpc_cred *       rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int);
 137 void                    rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
 138 struct rpc_cred *       rpcauth_lookupcred(struct rpc_auth *, int);
 139 struct rpc_cred *       rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *, int);
 140 void                    put_rpccred(struct rpc_cred *);
 141 __be32 *                rpcauth_marshcred(struct rpc_task *, __be32 *);
 142 __be32 *                rpcauth_checkverf(struct rpc_task *, __be32 *);
 143 int                     rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, __be32 *data, void *obj);
 144 int                     rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, __be32 *data, void *obj);
 145 int                     rpcauth_refreshcred(struct rpc_task *);
 146 void                    rpcauth_invalcred(struct rpc_task *);
 147 int                     rpcauth_uptodatecred(struct rpc_task *);
 148 int                     rpcauth_init_credcache(struct rpc_auth *);
 149 void                    rpcauth_destroy_credcache(struct rpc_auth *);
 150 void                    rpcauth_clear_credcache(struct rpc_cred_cache *);
 151
 152 static inline
 153 struct rpc_cred *       get_rpccred(struct rpc_cred *cred)
 154 {
 155         atomic_inc(&cred->cr_count);
 156         return cred;
 157 }
 158
 159 #endif /* __KERNEL__ */
 160 #endif /* _LINUX_SUNRPC_AUTH_H */