blob: 3f4d1f622de8d4db9891128d0b2344cb287e88c0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/net/sunrpc/svcauth.c
3 *
4 * The generic interface for RPC authentication on the server side.
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 *
8 * CHANGES
9 * 19-Apr-2000 Chris Evans - Security fix
10 */
11
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>
21
22#define RPCDBG_FACILITY RPCDBG_AUTH
23
24
25/*
26 * Table of authenticators
27 */
28extern struct auth_ops svcauth_null;
29extern struct auth_ops svcauth_unix;
30
31static DEFINE_SPINLOCK(authtab_lock);
32static struct auth_ops *authtab[RPC_AUTH_MAXFLAVOR] = {
33 [0] = &svcauth_null,
34 [1] = &svcauth_unix,
35};
36
37int
38svc_authenticate(struct svc_rqst *rqstp, u32 *authp)
39{
40 rpc_authflavor_t flavor;
41 struct auth_ops *aops;
42
43 *authp = rpc_auth_ok;
44
Alexey Dobriyan76994312006-09-26 22:28:46 -070045 flavor = svc_getnl(&rqstp->rq_arg.head[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47 dprintk("svc: svc_authenticate (%d)\n", flavor);
48
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;
54 return SVC_DENIED;
55 }
56 spin_unlock(&authtab_lock);
57
58 rqstp->rq_authop = aops;
59 return aops->accept(rqstp, authp);
60}
61
62int svc_set_client(struct svc_rqst *rqstp)
63{
64 return rqstp->rq_authop->set_client(rqstp);
65}
66
67/* A request, which was authenticated, has now executed.
68 * Time to finalise the the credentials and verifier
69 * and release and resources
70 */
71int svc_authorise(struct svc_rqst *rqstp)
72{
73 struct auth_ops *aops = rqstp->rq_authop;
74 int rv = 0;
75
76 rqstp->rq_authop = NULL;
77
78 if (aops) {
79 rv = aops->release(rqstp);
80 module_put(aops->owner);
81 }
82 return rv;
83}
84
85int
86svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops)
87{
88 int rv = -EINVAL;
89 spin_lock(&authtab_lock);
90 if (flavor < RPC_AUTH_MAXFLAVOR && authtab[flavor] == NULL) {
91 authtab[flavor] = aops;
92 rv = 0;
93 }
94 spin_unlock(&authtab_lock);
95 return rv;
96}
97
98void
99svc_auth_unregister(rpc_authflavor_t flavor)
100{
101 spin_lock(&authtab_lock);
102 if (flavor < RPC_AUTH_MAXFLAVOR)
103 authtab[flavor] = NULL;
104 spin_unlock(&authtab_lock);
105}
106EXPORT_SYMBOL(svc_auth_unregister);
107
108/**************************************************
NeilBrownefc36aa2006-03-27 01:14:59 -0800109 * '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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 */
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#define DN_HASHBITS 6
118#define DN_HASHMAX (1<<DN_HASHBITS)
119#define DN_HASHMASK (DN_HASHMAX-1)
120
NeilBrownefc36aa2006-03-27 01:14:59 -0800121static struct hlist_head auth_domain_table[DN_HASHMAX];
122static spinlock_t auth_domain_lock = SPIN_LOCK_UNLOCKED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124void auth_domain_put(struct auth_domain *dom)
125{
NeilBrownefc36aa2006-03-27 01:14:59 -0800126 if (atomic_dec_and_lock(&dom->ref.refcount, &auth_domain_lock)) {
127 hlist_del(&dom->hash);
128 dom->flavour->domain_release(dom);
129 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130}
131
132struct auth_domain *
NeilBrownefc36aa2006-03-27 01:14:59 -0800133auth_domain_lookup(char *name, struct auth_domain *new)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
NeilBrownefc36aa2006-03-27 01:14:59 -0800135 struct auth_domain *hp;
136 struct hlist_head *head;
137 struct hlist_node *np;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
NeilBrownefc36aa2006-03-27 01:14:59 -0800139 head = &auth_domain_table[hash_str(name, DN_HASHBITS)];
140
141 spin_lock(&auth_domain_lock);
142
143 hlist_for_each_entry(hp, np, head, hash) {
144 if (strcmp(hp->name, name)==0) {
145 kref_get(&hp->ref);
146 spin_unlock(&auth_domain_lock);
147 return hp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
NeilBrownefc36aa2006-03-27 01:14:59 -0800150 if (new) {
151 hlist_add_head(&new->hash, head);
152 kref_get(&new->ref);
153 }
154 spin_unlock(&auth_domain_lock);
155 return new;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
158struct auth_domain *auth_domain_find(char *name)
159{
NeilBrownefc36aa2006-03-27 01:14:59 -0800160 return auth_domain_lookup(name, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161}