1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/include/linux/sunrpc/auth.h
5 * Declarations for the RPC client authentication machinery.
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
10 #ifndef _LINUX_SUNRPC_AUTH_H
11 #define _LINUX_SUNRPC_AUTH_H
15 #include <linux/sunrpc/sched.h>
16 #include <linux/sunrpc/msg_prot.h>
17 #include <linux/sunrpc/xdr.h>
19 #include <linux/atomic.h>
20 #include <linux/rcupdate.h>
21 #include <linux/uidgid.h>
22 #include <linux/utsname.h>
25 * Maximum size of AUTH_NONE authentication information, in XDR words.
27 #define NUL_CALLSLACK (4)
28 #define NUL_REPLYSLACK (2)
31 * Size of the nodename buffer. RFC1831 specifies a hard limit of 255 bytes,
32 * but Linux hostnames are actually limited to __NEW_UTS_LEN bytes.
34 #define UNX_MAXNODENAME __NEW_UTS_LEN
35 #define UNX_CALLSLACK (21 + XDR_QUADLEN(UNX_MAXNODENAME))
36 #define UNX_NGROUPS 16
38 struct rpcsec_gss_info;
41 const struct cred *cred;
42 const char *principal; /* If present, this is a machine credential */
46 * Client user credentials
51 struct hlist_node cr_hash; /* hash chain */
52 struct list_head cr_lru; /* lru garbage collection */
53 struct rcu_head cr_rcu;
54 struct rpc_auth * cr_auth;
55 const struct rpc_credops *cr_ops;
56 unsigned long cr_expire; /* when to gc */
57 unsigned long cr_flags; /* various flags */
58 refcount_t cr_count; /* ref count */
59 const struct cred *cr_cred;
65 #define RPCAUTH_CRED_NEW 0
66 #define RPCAUTH_CRED_UPTODATE 1
67 #define RPCAUTH_CRED_HASHED 2
68 #define RPCAUTH_CRED_NEGATIVE 3
70 struct rpc_cred *rpc_machine_cred(void);
72 /* rpc_auth au_flags */
73 #define RPCAUTH_AUTH_NO_CRKEY_TIMEOUT 0x0001 /* underlying cred has no key timeout */
76 * Client authentication handle
78 struct rpc_cred_cache;
81 unsigned int au_cslack; /* call cred size estimate */
82 /* guess at number of u32's auth adds before
83 * reply data; normally the verifier size: */
84 unsigned int au_rslack;
85 /* for gss, used to calculate au_rslack: */
86 unsigned int au_verfsize;
88 unsigned int au_flags; /* various flags */
89 const struct rpc_authops *au_ops; /* operations */
90 rpc_authflavor_t au_flavor; /* pseudoflavor (note may
91 * differ from the flavor in
92 * au_ops->au_flavor in gss
94 refcount_t au_count; /* Reference counter */
96 struct rpc_cred_cache * au_credcache;
100 /* rpc_auth au_flags */
101 #define RPCAUTH_AUTH_DATATOUCH 0x00000002
103 struct rpc_auth_create_args {
104 rpc_authflavor_t pseudoflavor;
105 const char *target_name;
108 /* Flags for rpcauth_lookupcred() */
109 #define RPCAUTH_LOOKUP_NEW 0x01 /* Accept an uninitialised cred */
110 #define RPCAUTH_LOOKUP_RCU 0x02 /* lock-less lookup */
113 * Client authentication ops
116 struct module *owner;
117 rpc_authflavor_t au_flavor; /* flavor (RPC_AUTH_*) */
119 struct rpc_auth * (*create)(const struct rpc_auth_create_args *,
121 void (*destroy)(struct rpc_auth *);
123 int (*hash_cred)(struct auth_cred *, unsigned int);
124 struct rpc_cred * (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
125 struct rpc_cred * (*crcreate)(struct rpc_auth*, struct auth_cred *, int, gfp_t);
126 int (*list_pseudoflavors)(rpc_authflavor_t *, int);
127 rpc_authflavor_t (*info2flavor)(struct rpcsec_gss_info *);
128 int (*flavor2info)(rpc_authflavor_t,
129 struct rpcsec_gss_info *);
130 int (*key_timeout)(struct rpc_auth *,
135 const char * cr_name; /* Name of the auth flavour */
136 int (*cr_init)(struct rpc_auth *, struct rpc_cred *);
137 void (*crdestroy)(struct rpc_cred *);
139 int (*crmatch)(struct auth_cred *, struct rpc_cred *, int);
140 struct rpc_cred * (*crbind)(struct rpc_task *, struct rpc_cred *, int);
141 __be32 * (*crmarshal)(struct rpc_task *, __be32 *);
142 int (*crrefresh)(struct rpc_task *);
143 __be32 * (*crvalidate)(struct rpc_task *, __be32 *);
144 int (*crwrap_req)(struct rpc_task *, kxdreproc_t,
145 void *, __be32 *, void *);
146 int (*crunwrap_resp)(struct rpc_task *, kxdrdproc_t,
147 void *, __be32 *, void *);
148 int (*crkey_timeout)(struct rpc_cred *);
149 char * (*crstringify_acceptor)(struct rpc_cred *);
150 bool (*crneed_reencode)(struct rpc_task *);
153 extern const struct rpc_authops authunix_ops;
154 extern const struct rpc_authops authnull_ops;
156 int __init rpc_init_authunix(void);
157 int __init rpc_init_generic_auth(void);
158 int __init rpcauth_init_module(void);
159 void rpcauth_remove_module(void);
160 void rpc_destroy_generic_auth(void);
161 void rpc_destroy_authunix(void);
163 struct rpc_cred * rpc_lookup_cred(void);
164 struct rpc_cred * rpc_lookup_cred_nonblock(void);
165 struct rpc_cred * rpc_lookup_generic_cred(struct auth_cred *, int, gfp_t);
166 int rpcauth_register(const struct rpc_authops *);
167 int rpcauth_unregister(const struct rpc_authops *);
168 struct rpc_auth * rpcauth_create(const struct rpc_auth_create_args *,
170 void rpcauth_release(struct rpc_auth *);
171 rpc_authflavor_t rpcauth_get_pseudoflavor(rpc_authflavor_t,
172 struct rpcsec_gss_info *);
173 int rpcauth_get_gssinfo(rpc_authflavor_t,
174 struct rpcsec_gss_info *);
175 int rpcauth_list_flavors(rpc_authflavor_t *, int);
176 struct rpc_cred * rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int, gfp_t);
177 void rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
178 struct rpc_cred * rpcauth_lookupcred(struct rpc_auth *, int);
179 struct rpc_cred * rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *, int);
180 void put_rpccred(struct rpc_cred *);
181 __be32 * rpcauth_marshcred(struct rpc_task *, __be32 *);
182 __be32 * rpcauth_checkverf(struct rpc_task *, __be32 *);
183 int rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, __be32 *data, void *obj);
184 int rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, __be32 *data, void *obj);
185 bool rpcauth_xmit_need_reencode(struct rpc_task *task);
186 int rpcauth_refreshcred(struct rpc_task *);
187 void rpcauth_invalcred(struct rpc_task *);
188 int rpcauth_uptodatecred(struct rpc_task *);
189 int rpcauth_init_credcache(struct rpc_auth *);
190 void rpcauth_destroy_credcache(struct rpc_auth *);
191 void rpcauth_clear_credcache(struct rpc_cred_cache *);
192 char * rpcauth_stringify_acceptor(struct rpc_cred *);
195 struct rpc_cred *get_rpccred(struct rpc_cred *cred)
197 if (cred != NULL && refcount_inc_not_zero(&cred->cr_count))
203 * get_rpccred_rcu - get a reference to a cred using rcu-protected pointer
204 * @cred: cred of which to take a reference
206 * In some cases, we may have a pointer to a credential to which we
207 * want to take a reference, but don't already have one. Because these
208 * objects are freed using RCU, we can access the cr_count while its
209 * on its way to destruction and only take a reference if it's not already
212 static inline struct rpc_cred *
213 get_rpccred_rcu(struct rpc_cred *cred)
215 return get_rpccred(cred);
218 #endif /* __KERNEL__ */
219 #endif /* _LINUX_SUNRPC_AUTH_H */