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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#include <linux/uidgid.h>
21#include <linux/utsname.h>
22
23/*
24 * Maximum size of AUTH_NONE authentication information, in XDR words.
25 */
26#define NUL_CALLSLACK (4)
27#define NUL_REPLYSLACK (2)
28
29/*
30 * Size of the nodename buffer. RFC1831 specifies a hard limit of 255 bytes,
31 * but Linux hostnames are actually limited to __NEW_UTS_LEN bytes.
32 */
33#define UNX_MAXNODENAME __NEW_UTS_LEN
34#define UNX_CALLSLACK (21 + XDR_QUADLEN(UNX_MAXNODENAME))
35
36struct rpcsec_gss_info;
37
38/* auth_cred ac_flags bits */
39enum {
40 RPC_CRED_KEY_EXPIRE_SOON = 1, /* underlying cred key will expire soon */
41 RPC_CRED_NOTIFY_TIMEOUT = 2, /* nofity generic cred when underlying
42 key will expire soon */
43};
44
45/* Work around the lack of a VFS credential */
46struct auth_cred {
47 kuid_t uid;
48 kgid_t gid;
49 struct group_info *group_info;
50 const char *principal;
51 unsigned long ac_flags;
52 unsigned char machine_cred : 1;
53};
54
55/*
56 * Client user credentials
57 */
58struct rpc_auth;
59struct rpc_credops;
60struct rpc_cred {
61 struct hlist_node cr_hash; /* hash chain */
62 struct list_head cr_lru; /* lru garbage collection */
63 struct rcu_head cr_rcu;
64 struct rpc_auth * cr_auth;
65 const struct rpc_credops *cr_ops;
66#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
67 unsigned long cr_magic; /* 0x0f4aa4f0 */
68#endif
69 unsigned long cr_expire; /* when to gc */
70 unsigned long cr_flags; /* various flags */
71 atomic_t cr_count; /* ref count */
72
73 kuid_t cr_uid;
74
75 /* per-flavor data */
76};
77#define RPCAUTH_CRED_NEW 0
78#define RPCAUTH_CRED_UPTODATE 1
79#define RPCAUTH_CRED_HASHED 2
80#define RPCAUTH_CRED_NEGATIVE 3
81
82#define RPCAUTH_CRED_MAGIC 0x0f4aa4f0
83
84/* rpc_auth au_flags */
85#define RPCAUTH_AUTH_NO_CRKEY_TIMEOUT 0x0001 /* underlying cred has no key timeout */
86
87/*
88 * Client authentication handle
89 */
90struct rpc_cred_cache;
91struct rpc_authops;
92struct rpc_auth {
93 unsigned int au_cslack; /* call cred size estimate */
94 /* guess at number of u32's auth adds before
95 * reply data; normally the verifier size: */
96 unsigned int au_rslack;
97 /* for gss, used to calculate au_rslack: */
98 unsigned int au_verfsize;
99
100 unsigned int au_flags; /* various flags */
101 const struct rpc_authops *au_ops; /* operations */
102 rpc_authflavor_t au_flavor; /* pseudoflavor (note may
103 * differ from the flavor in
104 * au_ops->au_flavor in gss
105 * case) */
106 atomic_t au_count; /* Reference counter */
107
108 struct rpc_cred_cache * au_credcache;
109 /* per-flavor data */
110};
111
112/* rpc_auth au_flags */
113#define RPCAUTH_AUTH_DATATOUCH 0x00000002
114
115struct rpc_auth_create_args {
116 rpc_authflavor_t pseudoflavor;
117 const char *target_name;
118};
119
120/* Flags for rpcauth_lookupcred() */
121#define RPCAUTH_LOOKUP_NEW 0x01 /* Accept an uninitialised cred */
122#define RPCAUTH_LOOKUP_RCU 0x02 /* lock-less lookup */
123
124/*
125 * Client authentication ops
126 */
127struct rpc_authops {
128 struct module *owner;
129 rpc_authflavor_t au_flavor; /* flavor (RPC_AUTH_*) */
130 char * au_name;
131 struct rpc_auth * (*create)(struct rpc_auth_create_args *, struct rpc_clnt *);
132 void (*destroy)(struct rpc_auth *);
133
134 struct rpc_cred * (*lookup_cred)(struct rpc_auth *, struct auth_cred *, int);
135 struct rpc_cred * (*crcreate)(struct rpc_auth*, struct auth_cred *, int, gfp_t);
136 int (*list_pseudoflavors)(rpc_authflavor_t *, int);
137 rpc_authflavor_t (*info2flavor)(struct rpcsec_gss_info *);
138 int (*flavor2info)(rpc_authflavor_t,
139 struct rpcsec_gss_info *);
140 int (*key_timeout)(struct rpc_auth *,
141 struct rpc_cred *);
142};
143
144struct rpc_credops {
145 const char * cr_name; /* Name of the auth flavour */
146 int (*cr_init)(struct rpc_auth *, struct rpc_cred *);
147 void (*crdestroy)(struct rpc_cred *);
148
149 int (*crmatch)(struct auth_cred *, struct rpc_cred *, int);
150 struct rpc_cred * (*crbind)(struct rpc_task *, struct rpc_cred *, int);
151 __be32 * (*crmarshal)(struct rpc_task *, __be32 *);
152 int (*crrefresh)(struct rpc_task *);
153 __be32 * (*crvalidate)(struct rpc_task *, __be32 *);
154 int (*crwrap_req)(struct rpc_task *, kxdreproc_t,
155 void *, __be32 *, void *);
156 int (*crunwrap_resp)(struct rpc_task *, kxdrdproc_t,
157 void *, __be32 *, void *);
158 int (*crkey_timeout)(struct rpc_cred *);
159 bool (*crkey_to_expire)(struct rpc_cred *);
160 char * (*crstringify_acceptor)(struct rpc_cred *);
161};
162
163extern const struct rpc_authops authunix_ops;
164extern const struct rpc_authops authnull_ops;
165
166int __init rpc_init_authunix(void);
167int __init rpc_init_generic_auth(void);
168int __init rpcauth_init_module(void);
169void rpcauth_remove_module(void);
170void rpc_destroy_generic_auth(void);
171void rpc_destroy_authunix(void);
172
173struct rpc_cred * rpc_lookup_cred(void);
174struct rpc_cred * rpc_lookup_cred_nonblock(void);
175struct rpc_cred * rpc_lookup_generic_cred(struct auth_cred *, int, gfp_t);
176struct rpc_cred * rpc_lookup_machine_cred(const char *service_name);
177int rpcauth_register(const struct rpc_authops *);
178int rpcauth_unregister(const struct rpc_authops *);
179struct rpc_auth * rpcauth_create(struct rpc_auth_create_args *,
180 struct rpc_clnt *);
181void rpcauth_release(struct rpc_auth *);
182rpc_authflavor_t rpcauth_get_pseudoflavor(rpc_authflavor_t,
183 struct rpcsec_gss_info *);
184int rpcauth_get_gssinfo(rpc_authflavor_t,
185 struct rpcsec_gss_info *);
186int rpcauth_list_flavors(rpc_authflavor_t *, int);
187struct rpc_cred * rpcauth_lookup_credcache(struct rpc_auth *, struct auth_cred *, int, gfp_t);
188void rpcauth_init_cred(struct rpc_cred *, const struct auth_cred *, struct rpc_auth *, const struct rpc_credops *);
189struct rpc_cred * rpcauth_lookupcred(struct rpc_auth *, int);
190struct rpc_cred * rpcauth_generic_bind_cred(struct rpc_task *, struct rpc_cred *, int);
191void put_rpccred(struct rpc_cred *);
192__be32 * rpcauth_marshcred(struct rpc_task *, __be32 *);
193__be32 * rpcauth_checkverf(struct rpc_task *, __be32 *);
194int rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, __be32 *data, void *obj);
195int rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, __be32 *data, void *obj);
196int rpcauth_refreshcred(struct rpc_task *);
197void rpcauth_invalcred(struct rpc_task *);
198int rpcauth_uptodatecred(struct rpc_task *);
199int rpcauth_init_credcache(struct rpc_auth *);
200void rpcauth_destroy_credcache(struct rpc_auth *);
201void rpcauth_clear_credcache(struct rpc_cred_cache *);
202int rpcauth_key_timeout_notify(struct rpc_auth *,
203 struct rpc_cred *);
204bool rpcauth_cred_key_to_expire(struct rpc_auth *, struct rpc_cred *);
205char * rpcauth_stringify_acceptor(struct rpc_cred *);
206
207static inline
208struct rpc_cred * get_rpccred(struct rpc_cred *cred)
209{
210 if (cred != NULL)
211 atomic_inc(&cred->cr_count);
212 return cred;
213}
214
215/**
216 * get_rpccred_rcu - get a reference to a cred using rcu-protected pointer
217 * @cred: cred of which to take a reference
218 *
219 * In some cases, we may have a pointer to a credential to which we
220 * want to take a reference, but don't already have one. Because these
221 * objects are freed using RCU, we can access the cr_count while its
222 * on its way to destruction and only take a reference if it's not already
223 * zero.
224 */
225static inline struct rpc_cred *
226get_rpccred_rcu(struct rpc_cred *cred)
227{
228 if (atomic_inc_not_zero(&cred->cr_count))
229 return cred;
230 return NULL;
231}
232
233#endif /* __KERNEL__ */
234#endif /* _LINUX_SUNRPC_AUTH_H */