mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
74aaf96fea
Initial support for the RPC_AUTH_TLS authentication flavor enables NFSD to eventually accept an RPC_AUTH_TLS probe from clients. This patch simply prevents NFSD from rejecting these probes completely. In the meantime, graft this support in now so that RPC_AUTH_TLS support keeps up with generic code and API changes in the RPC server. Down the road, server-side transport implementations will populate xpo_start_tls when they can support RPC-with-TLS. For example, TCP will eventually populate it, but RDMA won't. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
235 lines
5.4 KiB
C
235 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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/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>
|
|
|
|
#include <trace/events/sunrpc.h>
|
|
|
|
#include "sunrpc.h"
|
|
|
|
#define RPCDBG_FACILITY RPCDBG_AUTH
|
|
|
|
|
|
/*
|
|
* Table of authenticators
|
|
*/
|
|
extern struct auth_ops svcauth_null;
|
|
extern struct auth_ops svcauth_unix;
|
|
extern struct auth_ops svcauth_tls;
|
|
|
|
static struct auth_ops __rcu *authtab[RPC_AUTH_MAXFLAVOR] = {
|
|
[RPC_AUTH_NULL] = (struct auth_ops __force __rcu *)&svcauth_null,
|
|
[RPC_AUTH_UNIX] = (struct auth_ops __force __rcu *)&svcauth_unix,
|
|
[RPC_AUTH_TLS] = (struct auth_ops __force __rcu *)&svcauth_tls,
|
|
};
|
|
|
|
static struct auth_ops *
|
|
svc_get_auth_ops(rpc_authflavor_t flavor)
|
|
{
|
|
struct auth_ops *aops;
|
|
|
|
if (flavor >= RPC_AUTH_MAXFLAVOR)
|
|
return NULL;
|
|
rcu_read_lock();
|
|
aops = rcu_dereference(authtab[flavor]);
|
|
if (aops != NULL && !try_module_get(aops->owner))
|
|
aops = NULL;
|
|
rcu_read_unlock();
|
|
return aops;
|
|
}
|
|
|
|
static void
|
|
svc_put_auth_ops(struct auth_ops *aops)
|
|
{
|
|
module_put(aops->owner);
|
|
}
|
|
|
|
int
|
|
svc_authenticate(struct svc_rqst *rqstp)
|
|
{
|
|
rpc_authflavor_t flavor;
|
|
struct auth_ops *aops;
|
|
|
|
rqstp->rq_auth_stat = rpc_auth_ok;
|
|
|
|
flavor = svc_getnl(&rqstp->rq_arg.head[0]);
|
|
|
|
dprintk("svc: svc_authenticate (%d)\n", flavor);
|
|
|
|
aops = svc_get_auth_ops(flavor);
|
|
if (aops == NULL) {
|
|
rqstp->rq_auth_stat = rpc_autherr_badcred;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
rqstp->rq_auth_slack = 0;
|
|
init_svc_cred(&rqstp->rq_cred);
|
|
|
|
rqstp->rq_authop = aops;
|
|
return aops->accept(rqstp);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_authenticate);
|
|
|
|
int svc_set_client(struct svc_rqst *rqstp)
|
|
{
|
|
rqstp->rq_client = NULL;
|
|
return rqstp->rq_authop->set_client(rqstp);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_set_client);
|
|
|
|
/* A request, which was authenticated, has now executed.
|
|
* Time to finalise 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);
|
|
svc_put_auth_ops(aops);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
int
|
|
svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops)
|
|
{
|
|
struct auth_ops *old;
|
|
int rv = -EINVAL;
|
|
|
|
if (flavor < RPC_AUTH_MAXFLAVOR) {
|
|
old = cmpxchg((struct auth_ops ** __force)&authtab[flavor], NULL, aops);
|
|
if (old == NULL || old == aops)
|
|
rv = 0;
|
|
}
|
|
return rv;
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_auth_register);
|
|
|
|
void
|
|
svc_auth_unregister(rpc_authflavor_t flavor)
|
|
{
|
|
if (flavor < RPC_AUTH_MAXFLAVOR)
|
|
rcu_assign_pointer(authtab[flavor], NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svc_auth_unregister);
|
|
|
|
/**************************************************
|
|
* 'auth_domains' are stored in a hash table indexed by name.
|
|
* When the last reference to an 'auth_domain' is dropped,
|
|
* the object is unhashed and freed.
|
|
* If auth_domain_lookup fails to find an entry, it will return
|
|
* it's second argument 'new'. If this is non-null, it will
|
|
* have been atomically linked into the table.
|
|
*/
|
|
|
|
#define DN_HASHBITS 6
|
|
#define DN_HASHMAX (1<<DN_HASHBITS)
|
|
|
|
static struct hlist_head auth_domain_table[DN_HASHMAX];
|
|
static DEFINE_SPINLOCK(auth_domain_lock);
|
|
|
|
static void auth_domain_release(struct kref *kref)
|
|
__releases(&auth_domain_lock)
|
|
{
|
|
struct auth_domain *dom = container_of(kref, struct auth_domain, ref);
|
|
|
|
hlist_del_rcu(&dom->hash);
|
|
dom->flavour->domain_release(dom);
|
|
spin_unlock(&auth_domain_lock);
|
|
}
|
|
|
|
void auth_domain_put(struct auth_domain *dom)
|
|
{
|
|
kref_put_lock(&dom->ref, auth_domain_release, &auth_domain_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(auth_domain_put);
|
|
|
|
struct auth_domain *
|
|
auth_domain_lookup(char *name, struct auth_domain *new)
|
|
{
|
|
struct auth_domain *hp;
|
|
struct hlist_head *head;
|
|
|
|
head = &auth_domain_table[hash_str(name, DN_HASHBITS)];
|
|
|
|
spin_lock(&auth_domain_lock);
|
|
|
|
hlist_for_each_entry(hp, head, hash) {
|
|
if (strcmp(hp->name, name)==0) {
|
|
kref_get(&hp->ref);
|
|
spin_unlock(&auth_domain_lock);
|
|
return hp;
|
|
}
|
|
}
|
|
if (new)
|
|
hlist_add_head_rcu(&new->hash, head);
|
|
spin_unlock(&auth_domain_lock);
|
|
return new;
|
|
}
|
|
EXPORT_SYMBOL_GPL(auth_domain_lookup);
|
|
|
|
struct auth_domain *auth_domain_find(char *name)
|
|
{
|
|
struct auth_domain *hp;
|
|
struct hlist_head *head;
|
|
|
|
head = &auth_domain_table[hash_str(name, DN_HASHBITS)];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(hp, head, hash) {
|
|
if (strcmp(hp->name, name)==0) {
|
|
if (!kref_get_unless_zero(&hp->ref))
|
|
hp = NULL;
|
|
rcu_read_unlock();
|
|
return hp;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(auth_domain_find);
|
|
|
|
/**
|
|
* auth_domain_cleanup - check that the auth_domain table is empty
|
|
*
|
|
* On module unload the auth_domain_table must be empty. To make it
|
|
* easier to catch bugs which don't clean up domains properly, we
|
|
* warn if anything remains in the table at cleanup time.
|
|
*
|
|
* Note that we cannot proactively remove the domains at this stage.
|
|
* The ->release() function might be in a module that has already been
|
|
* unloaded.
|
|
*/
|
|
|
|
void auth_domain_cleanup(void)
|
|
{
|
|
int h;
|
|
struct auth_domain *hp;
|
|
|
|
for (h = 0; h < DN_HASHMAX; h++)
|
|
hlist_for_each_entry(hp, &auth_domain_table[h], hash)
|
|
pr_warn("svc: domain %s still present at module unload.\n",
|
|
hp->name);
|
|
}
|