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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * linux/include/linux/sunrpc/auth.h
4 *
5 * Declarations for the RPC client authentication machinery.
6 *
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 */
9
10#ifndef _LINUX_SUNRPC_AUTH_H
11#define _LINUX_SUNRPC_AUTH_H
12
13#ifdef __KERNEL__
14
15#include <linux/sunrpc/sched.h>
16#include <linux/sunrpc/msg_prot.h>
17#include <linux/sunrpc/xdr.h>
18
19#include <linux/atomic.h>
20#include <linux/rcupdate.h>
21#include <linux/uidgid.h>
22#include <linux/utsname.h>
23
24/*
25 * Maximum size of AUTH_NONE authentication information, in XDR words.
26 */
27#define NUL_CALLSLACK (4)
28#define NUL_REPLYSLACK (2)
29
30/*
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.
33 */
34#define UNX_MAXNODENAME __NEW_UTS_LEN
35#define UNX_CALLSLACK (21 + XDR_QUADLEN(UNX_MAXNODENAME))
36#define UNX_NGROUPS 16
37
38struct rpcsec_gss_info;
39
40struct auth_cred {
41 const struct cred *cred;
42 const char *principal; /* If present, this is a machine credential */
43};
44
45/*
46 * Client user credentials
47 */
48struct rpc_auth;
49struct rpc_credops;
50struct rpc_cred {
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;
60
61 /* per-flavor data */
62};
63#define RPCAUTH_CRED_NEW 0
64#define RPCAUTH_CRED_UPTODATE 1
65#define RPCAUTH_CRED_HASHED 2
66#define RPCAUTH_CRED_NEGATIVE 3
67
68const struct cred *rpc_machine_cred(void);
69
70/*
71 * Client authentication handle
72 */
73struct rpc_cred_cache;
74struct rpc_authops;
75struct rpc_auth {
76 unsigned int au_cslack; /* call cred size estimate */
77 unsigned int au_rslack; /* reply cred size estimate */
78 unsigned int au_verfsize; /* size of reply verifier */
79 unsigned int au_ralign; /* words before UL header */
80
81 unsigned int au_flags;
82 const struct rpc_authops *au_ops;
83 rpc_authflavor_t au_flavor; /* pseudoflavor (note may
84 * differ from the flavor in
85 * au_ops->au_flavor in gss
86 * case) */
87 refcount_t au_count; /* Reference counter */
88
89 struct rpc_cred_cache * au_credcache;
90 /* per-flavor data */
91};
92
93/* rpc_auth au_flags */
94#define RPCAUTH_AUTH_DATATOUCH 0x00000002
95
96struct rpc_auth_create_args {
97 rpc_authflavor_t pseudoflavor;
98 const char *target_name;
99};
100
101/* Flags for rpcauth_lookupcred() */
102#define RPCAUTH_LOOKUP_NEW 0x01 /* Accept an uninitialised cred */
103
104/*
105 * Client authentication ops
106 */
107struct rpc_authops {
108 struct module *owner;
109 rpc_authflavor_t au_flavor; /* flavor (RPC_AUTH_*) */
110 char * au_name;
111 struct rpc_auth * (*create)(const struct rpc_auth_create_args *,
112 struct rpc_clnt *);
113 void (*destroy)(struct rpc_auth *);
114
115 int (*hash_cred)(struct auth_cred *, unsigned int);
116 struct rpc_cred * (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
117 struct rpc_cred * (*crcreate)(struct rpc_auth*, struct auth_cred *, int, gfp_t);
118 int (*list_pseudoflavors)(rpc_authflavor_t *, int);
119 rpc_authflavor_t (*info2flavor)(struct rpcsec_gss_info *);
120 int (*flavor2info)(rpc_authflavor_t,
121 struct rpcsec_gss_info *);
122 int (*key_timeout)(struct rpc_auth *,
123 struct rpc_cred *);
124};
125
126struct rpc_credops {
127 const char * cr_name; /* Name of the auth flavour */
128 int (*cr_init)(struct rpc_auth *, struct rpc_cred *);
129 void (*crdestroy)(struct rpc_cred *);
130
131 int (*crmatch)(struct auth_cred *, struct rpc_cred *, int);
132 int (*crmarshal)(struct rpc_task *task,
133 struct xdr_stream *xdr);
134 int (*crrefresh)(struct rpc_task *);
135 int (*crvalidate)(struct rpc_task *task,
136 struct xdr_stream *xdr);
137 int (*crwrap_req)(struct rpc_task *task,
138 struct xdr_stream *xdr);
139 int (*crunwrap_resp)(struct rpc_task *task,
140 struct xdr_stream *xdr);
141 int (*crkey_timeout)(struct rpc_cred *);
142 char * (*crstringify_acceptor)(struct rpc_cred *);
143 bool (*crneed_reencode)(struct rpc_task *);
144};
145
146extern const struct rpc_authops authunix_ops;
147extern const struct rpc_authops authnull_ops;
148
149int __init rpc_init_authunix(void);
150int __init rpcauth_init_module(void);
151void rpcauth_remove_module(void);
152void rpc_destroy_authunix(void);
153
154int rpcauth_register(const struct rpc_authops *);
155int rpcauth_unregister(const struct rpc_authops *);
156struct rpc_auth * rpcauth_create(const struct rpc_auth_create_args *,
157 struct rpc_clnt *);
158void rpcauth_release(struct rpc_auth *);
159rpc_authflavor_t rpcauth_get_pseudoflavor(rpc_authflavor_t,
160 struct rpcsec_gss_info *);
161int rpcauth_get_gssinfo(rpc_authflavor_t,
162 struct rpcsec_gss_info *);
163int rpcauth_list_flavors(rpc_authflavor_t *, int);
164struct rpc_cred * rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int, gfp_t);
165void rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
166struct rpc_cred * rpcauth_lookupcred(struct rpc_auth *, int);
167void put_rpccred(struct rpc_cred *);
168int rpcauth_marshcred(struct rpc_task *task,
169 struct xdr_stream *xdr);
170int rpcauth_checkverf(struct rpc_task *task,
171 struct xdr_stream *xdr);
172int rpcauth_wrap_req_encode(struct rpc_task *task,
173 struct xdr_stream *xdr);
174int rpcauth_wrap_req(struct rpc_task *task,
175 struct xdr_stream *xdr);
176int rpcauth_unwrap_resp_decode(struct rpc_task *task,
177 struct xdr_stream *xdr);
178int rpcauth_unwrap_resp(struct rpc_task *task,
179 struct xdr_stream *xdr);
180bool rpcauth_xmit_need_reencode(struct rpc_task *task);
181int rpcauth_refreshcred(struct rpc_task *);
182void rpcauth_invalcred(struct rpc_task *);
183int rpcauth_uptodatecred(struct rpc_task *);
184int rpcauth_init_credcache(struct rpc_auth *);
185void rpcauth_destroy_credcache(struct rpc_auth *);
186void rpcauth_clear_credcache(struct rpc_cred_cache *);
187char * rpcauth_stringify_acceptor(struct rpc_cred *);
188
189static inline
190struct rpc_cred *get_rpccred(struct rpc_cred *cred)
191{
192 if (cred != NULL && refcount_inc_not_zero(&cred->cr_count))
193 return cred;
194 return NULL;
195}
196
197#endif /* __KERNEL__ */
198#endif /* _LINUX_SUNRPC_AUTH_H */