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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 */
25struct 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 */
36struct rpc_auth;
37struct rpc_credops;
38struct 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 */
65struct rpc_cred_cache;
66struct rpc_authops;
67struct 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 */
93struct 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
104struct 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
120extern const struct rpc_authops authunix_ops;
121extern const struct rpc_authops authnull_ops;
122
123int __init rpc_init_authunix(void);
124int __init rpc_init_generic_auth(void);
125int __init rpcauth_init_module(void);
126void rpcauth_remove_module(void);
127void rpc_destroy_generic_auth(void);
128void rpc_destroy_authunix(void);
129
130struct rpc_cred * rpc_lookup_cred(void);
131struct rpc_cred * rpc_lookup_machine_cred(const char *service_name);
132int rpcauth_register(const struct rpc_authops *);
133int rpcauth_unregister(const struct rpc_authops *);
134struct rpc_auth * rpcauth_create(rpc_authflavor_t, struct rpc_clnt *);
135void rpcauth_release(struct rpc_auth *);
136struct rpc_cred * rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int);
137void rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
138struct rpc_cred * rpcauth_lookupcred(struct rpc_auth *, int);
139struct rpc_cred * rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *, int);
140void put_rpccred(struct rpc_cred *);
141__be32 * rpcauth_marshcred(struct rpc_task *, __be32 *);
142__be32 * rpcauth_checkverf(struct rpc_task *, __be32 *);
143int rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, __be32 *data, void *obj);
144int rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, __be32 *data, void *obj);
145int rpcauth_refreshcred(struct rpc_task *);
146void rpcauth_invalcred(struct rpc_task *);
147int rpcauth_uptodatecred(struct rpc_task *);
148int rpcauth_init_credcache(struct rpc_auth *);
149void rpcauth_destroy_credcache(struct rpc_auth *);
150void rpcauth_clear_credcache(struct rpc_cred_cache *);
151
152static inline
153struct 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 */