2 * linux/net/sunrpc/svcauth.c
4 * The generic interface for RPC authentication on the server side.
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
9 * 19-Apr-2000 Chris Evans - Security fix
12 #include <linux/types.h>
13 #include <linux/sched.h>
14 #include <linux/module.h>
15 #include <linux/sunrpc/types.h>
16 #include <linux/sunrpc/xdr.h>
17 #include <linux/sunrpc/svcsock.h>
18 #include <linux/sunrpc/svcauth.h>
19 #include <linux/err.h>
20 #include <linux/hash.h>
22 #define RPCDBG_FACILITY RPCDBG_AUTH
26 * Table of authenticators
28 extern struct auth_ops svcauth_null
;
29 extern struct auth_ops svcauth_unix
;
31 static DEFINE_SPINLOCK(authtab_lock
);
32 static struct auth_ops
*authtab
[RPC_AUTH_MAXFLAVOR
] = {
38 svc_authenticate(struct svc_rqst
*rqstp
, __be32
*authp
)
40 rpc_authflavor_t flavor
;
41 struct auth_ops
*aops
;
45 flavor
= svc_getnl(&rqstp
->rq_arg
.head
[0]);
47 dprintk("svc: svc_authenticate (%d)\n", flavor
);
49 spin_lock(&authtab_lock
);
50 if (flavor
>= RPC_AUTH_MAXFLAVOR
|| !(aops
= authtab
[flavor
])
51 || !try_module_get(aops
->owner
)) {
52 spin_unlock(&authtab_lock
);
53 *authp
= rpc_autherr_badcred
;
56 spin_unlock(&authtab_lock
);
58 rqstp
->rq_authop
= aops
;
59 return aops
->accept(rqstp
, authp
);
62 int svc_set_client(struct svc_rqst
*rqstp
)
64 return rqstp
->rq_authop
->set_client(rqstp
);
67 /* A request, which was authenticated, has now executed.
68 * Time to finalise the the credentials and verifier
69 * and release and resources
71 int svc_authorise(struct svc_rqst
*rqstp
)
73 struct auth_ops
*aops
= rqstp
->rq_authop
;
76 rqstp
->rq_authop
= NULL
;
79 rv
= aops
->release(rqstp
);
80 module_put(aops
->owner
);
86 svc_auth_register(rpc_authflavor_t flavor
, struct auth_ops
*aops
)
89 spin_lock(&authtab_lock
);
90 if (flavor
< RPC_AUTH_MAXFLAVOR
&& authtab
[flavor
] == NULL
) {
91 authtab
[flavor
] = aops
;
94 spin_unlock(&authtab_lock
);
99 svc_auth_unregister(rpc_authflavor_t flavor
)
101 spin_lock(&authtab_lock
);
102 if (flavor
< RPC_AUTH_MAXFLAVOR
)
103 authtab
[flavor
] = NULL
;
104 spin_unlock(&authtab_lock
);
106 EXPORT_SYMBOL(svc_auth_unregister
);
108 /**************************************************
109 * 'auth_domains' are stored in a hash table indexed by name.
110 * When the last reference to an 'auth_domain' is dropped,
111 * the object is unhashed and freed.
112 * If auth_domain_lookup fails to find an entry, it will return
113 * it's second argument 'new'. If this is non-null, it will
114 * have been atomically linked into the table.
117 #define DN_HASHBITS 6
118 #define DN_HASHMAX (1<<DN_HASHBITS)
119 #define DN_HASHMASK (DN_HASHMAX-1)
121 static struct hlist_head auth_domain_table
[DN_HASHMAX
];
122 static spinlock_t auth_domain_lock
= SPIN_LOCK_UNLOCKED
;
124 void auth_domain_put(struct auth_domain
*dom
)
126 if (atomic_dec_and_lock(&dom
->ref
.refcount
, &auth_domain_lock
)) {
127 hlist_del(&dom
->hash
);
128 dom
->flavour
->domain_release(dom
);
129 spin_unlock(&auth_domain_lock
);
134 auth_domain_lookup(char *name
, struct auth_domain
*new)
136 struct auth_domain
*hp
;
137 struct hlist_head
*head
;
138 struct hlist_node
*np
;
140 head
= &auth_domain_table
[hash_str(name
, DN_HASHBITS
)];
142 spin_lock(&auth_domain_lock
);
144 hlist_for_each_entry(hp
, np
, head
, hash
) {
145 if (strcmp(hp
->name
, name
)==0) {
147 spin_unlock(&auth_domain_lock
);
152 hlist_add_head(&new->hash
, head
);
153 spin_unlock(&auth_domain_lock
);
157 struct auth_domain
*auth_domain_find(char *name
)
159 return auth_domain_lookup(name
, NULL
);