diff options
Diffstat (limited to 'net/sunrpc/svcauth.c')
| -rw-r--r-- | net/sunrpc/svcauth.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/net/sunrpc/svcauth.c b/net/sunrpc/svcauth.c new file mode 100644 index 00000000000..bde8147ef2d --- /dev/null +++ b/net/sunrpc/svcauth.c @@ -0,0 +1,216 @@ +/* + * linux/net/sunrpc/svcauth.c + * + * The generic interface for RPC authentication on the server side. + * + * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> + * + * CHANGES + * 19-Apr-2000 Chris Evans - Security fix + */ + +#include <linux/types.h> +#include <linux/sched.h> +#include <linux/module.h> +#include <linux/sunrpc/types.h> +#include <linux/sunrpc/xdr.h> +#include <linux/sunrpc/svcsock.h> +#include <linux/sunrpc/svcauth.h> +#include <linux/err.h> +#include <linux/hash.h> + +#define RPCDBG_FACILITY RPCDBG_AUTH + + +/* + * Table of authenticators + */ +extern struct auth_ops svcauth_null; +extern struct auth_ops svcauth_unix; + +static DEFINE_SPINLOCK(authtab_lock); +static struct auth_ops *authtab[RPC_AUTH_MAXFLAVOR] = { + [0] = &svcauth_null, + [1] = &svcauth_unix, +}; + +int +svc_authenticate(struct svc_rqst *rqstp, u32 *authp) +{ + rpc_authflavor_t flavor; + struct auth_ops *aops; + + *authp = rpc_auth_ok; + + flavor = ntohl(svc_getu32(&rqstp->rq_arg.head[0])); + + dprintk("svc: svc_authenticate (%d)\n", flavor); + + spin_lock(&authtab_lock); + if (flavor >= RPC_AUTH_MAXFLAVOR || !(aops = authtab[flavor]) + || !try_module_get(aops->owner)) { + spin_unlock(&authtab_lock); + *authp = rpc_autherr_badcred; + return SVC_DENIED; + } + spin_unlock(&authtab_lock); + + rqstp->rq_authop = aops; + return aops->accept(rqstp, authp); +} + +int svc_set_client(struct svc_rqst *rqstp) +{ + return rqstp->rq_authop->set_client(rqstp); +} + +/* A request, which was authenticated, has now executed. + * Time to finalise the the credentials and verifier + * and release and resources + */ +int svc_authorise(struct svc_rqst *rqstp) +{ + struct auth_ops *aops = rqstp->rq_authop; + int rv = 0; + + rqstp->rq_authop = NULL; + + if (aops) { + rv = aops->release(rqstp); + module_put(aops->owner); + } + return rv; +} + +int +svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops) +{ + int rv = -EINVAL; + spin_lock(&authtab_lock); + if (flavor < RPC_AUTH_MAXFLAVOR && authtab[flavor] == NULL) { + authtab[flavor] = aops; + rv = 0; + } + spin_unlock(&authtab_lock); + return rv; +} + +void +svc_auth_unregister(rpc_authflavor_t flavor) +{ + spin_lock(&authtab_lock); + if (flavor < RPC_AUTH_MAXFLAVOR) + authtab[flavor] = NULL; + spin_unlock(&authtab_lock); +} +EXPORT_SYMBOL(svc_auth_unregister); + +/************************************************** + * cache for domain name to auth_domain + * Entries are only added by flavours which will normally + * have a structure that 'inherits' from auth_domain. + * e.g. when an IP -> domainname is given to auth_unix, + * and the domain name doesn't exist, it will create a + * auth_unix_domain and add it to this hash table. + * If it finds the name does exist, but isn't AUTH_UNIX, + * it will complain. + */ + +/* + * Auth auth_domain cache is somewhat different to other caches, + * largely because the entries are possibly of different types: + * each auth flavour has it's own type. + * One consequence of this that DefineCacheLookup cannot + * allocate a new structure as it cannot know the size. + * Notice that the "INIT" code fragment is quite different + * from other caches. When auth_domain_lookup might be + * creating a new domain, the new domain is passed in + * complete and it is used as-is rather than being copied into + * another structure. + */ +#define DN_HASHBITS 6 +#define DN_HASHMAX (1<<DN_HASHBITS) +#define DN_HASHMASK (DN_HASHMAX-1) + +static struct cache_head *auth_domain_table[DN_HASHMAX]; + +static void auth_domain_drop(struct cache_head *item, struct cache_detail *cd) +{ + struct auth_domain *dom = container_of(item, struct auth_domain, h); + if (cache_put(item,cd)) + authtab[dom->flavour]->domain_release(dom); +} + + +struct cache_detail auth_domain_cache = { + .hash_size = DN_HASHMAX, + .hash_table = auth_domain_table, + .name = "auth.domain", + .cache_put = auth_domain_drop, +}; + +void auth_domain_put(struct auth_domain *dom) +{ + auth_domain_drop(&dom->h, &auth_domain_cache); +} + +static inline int auth_domain_hash(struct auth_domain *item) +{ + return hash_str(item->name, DN_HASHBITS); +} +static inline int auth_domain_match(struct auth_domain *tmp, struct auth_domain *item) +{ + return strcmp(tmp->name, item->name) == 0; +} + +struct auth_domain * +auth_domain_lookup(struct auth_domain *item, int set) +{ + struct auth_domain *tmp = NULL; + struct cache_head **hp, **head; + head = &auth_domain_cache.hash_table[auth_domain_hash(item)]; + + if (set) + write_lock(&auth_domain_cache.hash_lock); + else + read_lock(&auth_domain_cache.hash_lock); + for (hp=head; *hp != NULL; hp = &tmp->h.next) { + tmp = container_of(*hp, struct auth_domain, h); + if (!auth_domain_match(tmp, item)) + continue; + if (!set) { + cache_get(&tmp->h); + goto out_noset; + } + *hp = tmp->h.next; + tmp->h.next = NULL; + auth_domain_drop(&tmp->h, &auth_domain_cache); + goto out_set; + } + /* Didn't find anything */ + if (!set) + goto out_nada; + auth_domain_cache.entries++; +out_set: + item->h.next = *head; + *head = &item->h; + cache_get(&item->h); + write_unlock(&auth_domain_cache.hash_lock); + cache_fresh(&auth_domain_cache, &item->h, item->h.expiry_time); + cache_get(&item->h); + return item; +out_nada: + tmp = NULL; +out_noset: + read_unlock(&auth_domain_cache.hash_lock); + return tmp; +} + +struct auth_domain *auth_domain_find(char *name) +{ + struct auth_domain *rv, ad; + + ad.name = name; + rv = auth_domain_lookup(&ad, 0); + return rv; +} |