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 spinlock_t authtab_lock = SPIN_LOCK_UNLOCKED;
32 static struct auth_ops *authtab[RPC_AUTH_MAXFLAVOR] = {
38 svc_authenticate(struct svc_rqst *rqstp, u32 *authp)
40 rpc_authflavor_t flavor;
41 struct auth_ops *aops;
45 flavor = ntohl(svc_getu32(&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 /* A request, which was authenticated, has now executed.
63 * Time to finalise the the credentials and verifier
64 * and release and resources
66 int svc_authorise(struct svc_rqst *rqstp)
68 struct auth_ops *aops = rqstp->rq_authop;
71 rqstp->rq_authop = NULL;
74 rv = aops->release(rqstp);
75 module_put(aops->owner);
81 svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops)
84 spin_lock(&authtab_lock);
85 if (flavor < RPC_AUTH_MAXFLAVOR && authtab[flavor] == NULL) {
86 authtab[flavor] = aops;
89 spin_unlock(&authtab_lock);
94 svc_auth_unregister(rpc_authflavor_t flavor)
96 spin_lock(&authtab_lock);
97 if (flavor < RPC_AUTH_MAXFLAVOR)
98 authtab[flavor] = NULL;
99 spin_unlock(&authtab_lock);
101 EXPORT_SYMBOL(svc_auth_unregister);
103 /**************************************************
104 * cache for domain name to auth_domain
105 * Entries are only added by flavours which will normally
106 * have a structure that 'inherits' from auth_domain.
107 * e.g. when an IP -> domainname is given to auth_unix,
108 * and the domain name doesn't exist, it will create a
109 * auth_unix_domain and add it to this hash table.
110 * If it finds the name does exist, but isn't AUTH_UNIX,
115 * Auth auth_domain cache is somewhat different to other caches,
116 * largely because the entries are possibly of different types:
117 * each auth flavour has it's own type.
118 * One consequence of this that DefineCacheLookup cannot
119 * allocate a new structure as it cannot know the size.
120 * Notice that the "INIT" code fragment is quite different
121 * from other caches. When auth_domain_lookup might be
122 * creating a new domain, the new domain is passed in
123 * complete and it is used as-is rather than being copied into
126 #define DN_HASHBITS 6
127 #define DN_HASHMAX (1<<DN_HASHBITS)
128 #define DN_HASHMASK (DN_HASHMAX-1)
130 static struct cache_head *auth_domain_table[DN_HASHMAX];
131 void auth_domain_drop(struct cache_head *item, struct cache_detail *cd)
133 struct auth_domain *dom = container_of(item, struct auth_domain, h);
134 if (cache_put(item,cd))
135 authtab[dom->flavour]->domain_release(dom);
139 struct cache_detail auth_domain_cache = {
140 .hash_size = DN_HASHMAX,
141 .hash_table = auth_domain_table,
142 .name = "auth.domain",
143 .cache_put = auth_domain_drop,
146 void auth_domain_put(struct auth_domain *dom)
148 auth_domain_drop(&dom->h, &auth_domain_cache);
151 static inline int auth_domain_hash(struct auth_domain *item)
153 return hash_str(item->name, DN_HASHBITS);
155 static inline int auth_domain_match(struct auth_domain *tmp, struct auth_domain *item)
157 return strcmp(tmp->name, item->name) == 0;
161 auth_domain_lookup(struct auth_domain *item, int set)
163 struct auth_domain *tmp = NULL;
164 struct cache_head **hp, **head;
165 head = &auth_domain_cache.hash_table[auth_domain_hash(item)];
168 write_lock(&auth_domain_cache.hash_lock);
170 read_lock(&auth_domain_cache.hash_lock);
171 for (hp=head; *hp != NULL; hp = &tmp->h.next) {
172 tmp = container_of(*hp, struct auth_domain, h);
173 if (!auth_domain_match(tmp, item))
180 clear_bit(CACHE_HASHED, &tmp->h.flags);
181 auth_domain_drop(&tmp->h, &auth_domain_cache);
184 /* Didn't find anything */
187 auth_domain_cache.entries++;
189 set_bit(CACHE_HASHED, &item->h.flags);
190 item->h.next = *head;
192 write_unlock(&auth_domain_cache.hash_lock);
193 cache_fresh(&auth_domain_cache, &item->h, item->h.expiry_time);
199 read_unlock(&auth_domain_cache.hash_lock);
203 struct auth_domain *auth_domain_find(char *name)
205 struct auth_domain *rv, ad;
208 rv = auth_domain_lookup(&ad, 0);