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1da177e4 LT |
1 | /* |
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 | */ | |
28 | extern struct auth_ops svcauth_null; | |
29 | extern struct auth_ops svcauth_unix; | |
30 | ||
31 | static DEFINE_SPINLOCK(authtab_lock); | |
32 | static struct auth_ops *authtab[RPC_AUTH_MAXFLAVOR] = { | |
33 | [0] = &svcauth_null, | |
34 | [1] = &svcauth_unix, | |
35 | }; | |
36 | ||
37 | int | |
38 | svc_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 | ||
45 | flavor = ntohl(svc_getu32(&rqstp->rq_arg.head[0])); | |
46 | ||
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 | ||
62 | int 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 | */ | |
71 | int 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 | ||
85 | int | |
86 | svc_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 | ||
98 | void | |
99 | svc_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 | } | |
106 | EXPORT_SYMBOL(svc_auth_unregister); | |
107 | ||
108 | /************************************************** | |
efc36aa5 N |
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. | |
1da177e4 LT |
115 | */ |
116 | ||
1da177e4 LT |
117 | #define DN_HASHBITS 6 |
118 | #define DN_HASHMAX (1<<DN_HASHBITS) | |
119 | #define DN_HASHMASK (DN_HASHMAX-1) | |
120 | ||
efc36aa5 N |
121 | static struct hlist_head auth_domain_table[DN_HASHMAX]; |
122 | static spinlock_t auth_domain_lock = SPIN_LOCK_UNLOCKED; | |
1da177e4 LT |
123 | |
124 | void auth_domain_put(struct auth_domain *dom) | |
125 | { | |
efc36aa5 N |
126 | if (atomic_dec_and_lock(&dom->ref.refcount, &auth_domain_lock)) { |
127 | hlist_del(&dom->hash); | |
128 | dom->flavour->domain_release(dom); | |
129 | } | |
1da177e4 LT |
130 | } |
131 | ||
132 | struct auth_domain * | |
efc36aa5 | 133 | auth_domain_lookup(char *name, struct auth_domain *new) |
1da177e4 | 134 | { |
efc36aa5 N |
135 | struct auth_domain *hp; |
136 | struct hlist_head *head; | |
137 | struct hlist_node *np; | |
138 | ||
139 | 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; | |
1da177e4 | 148 | } |
1da177e4 | 149 | } |
efc36aa5 N |
150 | if (new) { |
151 | hlist_add_head(&new->hash, head); | |
152 | kref_get(&new->ref); | |
153 | } | |
154 | spin_unlock(&auth_domain_lock); | |
155 | return new; | |
1da177e4 LT |
156 | } |
157 | ||
158 | struct auth_domain *auth_domain_find(char *name) | |
159 | { | |
efc36aa5 | 160 | return auth_domain_lookup(name, NULL); |
1da177e4 | 161 | } |