You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
404 lines
9.4 KiB
404 lines
9.4 KiB
/*
|
|
* linux/net/sunrpc/auth.c
|
|
*
|
|
* Generic RPC client authentication API.
|
|
*
|
|
* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sunrpc/clnt.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#ifdef RPC_DEBUG
|
|
# define RPCDBG_FACILITY RPCDBG_AUTH
|
|
#endif
|
|
|
|
static struct rpc_authops * auth_flavors[RPC_AUTH_MAXFLAVOR] = {
|
|
&authnull_ops, /* AUTH_NULL */
|
|
&authunix_ops, /* AUTH_UNIX */
|
|
NULL, /* others can be loadable modules */
|
|
};
|
|
|
|
static u32
|
|
pseudoflavor_to_flavor(u32 flavor) {
|
|
if (flavor >= RPC_AUTH_MAXFLAVOR)
|
|
return RPC_AUTH_GSS;
|
|
return flavor;
|
|
}
|
|
|
|
int
|
|
rpcauth_register(struct rpc_authops *ops)
|
|
{
|
|
rpc_authflavor_t flavor;
|
|
|
|
if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
|
|
return -EINVAL;
|
|
if (auth_flavors[flavor] != NULL)
|
|
return -EPERM; /* what else? */
|
|
auth_flavors[flavor] = ops;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
rpcauth_unregister(struct rpc_authops *ops)
|
|
{
|
|
rpc_authflavor_t flavor;
|
|
|
|
if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
|
|
return -EINVAL;
|
|
if (auth_flavors[flavor] != ops)
|
|
return -EPERM; /* what else? */
|
|
auth_flavors[flavor] = NULL;
|
|
return 0;
|
|
}
|
|
|
|
struct rpc_auth *
|
|
rpcauth_create(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_auth *auth;
|
|
struct rpc_authops *ops;
|
|
u32 flavor = pseudoflavor_to_flavor(pseudoflavor);
|
|
|
|
if (flavor >= RPC_AUTH_MAXFLAVOR || !(ops = auth_flavors[flavor]))
|
|
return ERR_PTR(-EINVAL);
|
|
auth = ops->create(clnt, pseudoflavor);
|
|
if (IS_ERR(auth))
|
|
return auth;
|
|
if (clnt->cl_auth)
|
|
rpcauth_destroy(clnt->cl_auth);
|
|
clnt->cl_auth = auth;
|
|
return auth;
|
|
}
|
|
|
|
void
|
|
rpcauth_destroy(struct rpc_auth *auth)
|
|
{
|
|
if (!atomic_dec_and_test(&auth->au_count))
|
|
return;
|
|
auth->au_ops->destroy(auth);
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(rpc_credcache_lock);
|
|
|
|
/*
|
|
* Initialize RPC credential cache
|
|
*/
|
|
int
|
|
rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
|
|
{
|
|
struct rpc_cred_cache *new;
|
|
int i;
|
|
|
|
new = kmalloc(sizeof(*new), GFP_KERNEL);
|
|
if (!new)
|
|
return -ENOMEM;
|
|
for (i = 0; i < RPC_CREDCACHE_NR; i++)
|
|
INIT_HLIST_HEAD(&new->hashtable[i]);
|
|
new->expire = expire;
|
|
new->nextgc = jiffies + (expire >> 1);
|
|
auth->au_credcache = new;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Destroy a list of credentials
|
|
*/
|
|
static inline
|
|
void rpcauth_destroy_credlist(struct hlist_head *head)
|
|
{
|
|
struct rpc_cred *cred;
|
|
|
|
while (!hlist_empty(head)) {
|
|
cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
|
|
hlist_del_init(&cred->cr_hash);
|
|
put_rpccred(cred);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Clear the RPC credential cache, and delete those credentials
|
|
* that are not referenced.
|
|
*/
|
|
void
|
|
rpcauth_free_credcache(struct rpc_auth *auth)
|
|
{
|
|
struct rpc_cred_cache *cache = auth->au_credcache;
|
|
HLIST_HEAD(free);
|
|
struct hlist_node *pos, *next;
|
|
struct rpc_cred *cred;
|
|
int i;
|
|
|
|
spin_lock(&rpc_credcache_lock);
|
|
for (i = 0; i < RPC_CREDCACHE_NR; i++) {
|
|
hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
|
|
cred = hlist_entry(pos, struct rpc_cred, cr_hash);
|
|
__hlist_del(&cred->cr_hash);
|
|
hlist_add_head(&cred->cr_hash, &free);
|
|
}
|
|
}
|
|
spin_unlock(&rpc_credcache_lock);
|
|
rpcauth_destroy_credlist(&free);
|
|
}
|
|
|
|
static void
|
|
rpcauth_prune_expired(struct rpc_auth *auth, struct rpc_cred *cred, struct hlist_head *free)
|
|
{
|
|
if (atomic_read(&cred->cr_count) != 1)
|
|
return;
|
|
if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
|
|
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
|
|
if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
|
|
__hlist_del(&cred->cr_hash);
|
|
hlist_add_head(&cred->cr_hash, free);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove stale credentials. Avoid sleeping inside the loop.
|
|
*/
|
|
static void
|
|
rpcauth_gc_credcache(struct rpc_auth *auth, struct hlist_head *free)
|
|
{
|
|
struct rpc_cred_cache *cache = auth->au_credcache;
|
|
struct hlist_node *pos, *next;
|
|
struct rpc_cred *cred;
|
|
int i;
|
|
|
|
dprintk("RPC: gc'ing RPC credentials for auth %p\n", auth);
|
|
for (i = 0; i < RPC_CREDCACHE_NR; i++) {
|
|
hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
|
|
cred = hlist_entry(pos, struct rpc_cred, cr_hash);
|
|
rpcauth_prune_expired(auth, cred, free);
|
|
}
|
|
}
|
|
cache->nextgc = jiffies + cache->expire;
|
|
}
|
|
|
|
/*
|
|
* Look up a process' credentials in the authentication cache
|
|
*/
|
|
struct rpc_cred *
|
|
rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
|
|
int flags)
|
|
{
|
|
struct rpc_cred_cache *cache = auth->au_credcache;
|
|
HLIST_HEAD(free);
|
|
struct hlist_node *pos, *next;
|
|
struct rpc_cred *new = NULL,
|
|
*cred = NULL;
|
|
int nr = 0;
|
|
|
|
if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS))
|
|
nr = acred->uid & RPC_CREDCACHE_MASK;
|
|
retry:
|
|
spin_lock(&rpc_credcache_lock);
|
|
if (time_before(cache->nextgc, jiffies))
|
|
rpcauth_gc_credcache(auth, &free);
|
|
hlist_for_each_safe(pos, next, &cache->hashtable[nr]) {
|
|
struct rpc_cred *entry;
|
|
entry = hlist_entry(pos, struct rpc_cred, cr_hash);
|
|
if (entry->cr_ops->crmatch(acred, entry, flags)) {
|
|
hlist_del(&entry->cr_hash);
|
|
cred = entry;
|
|
break;
|
|
}
|
|
rpcauth_prune_expired(auth, entry, &free);
|
|
}
|
|
if (new) {
|
|
if (cred)
|
|
hlist_add_head(&new->cr_hash, &free);
|
|
else
|
|
cred = new;
|
|
}
|
|
if (cred) {
|
|
hlist_add_head(&cred->cr_hash, &cache->hashtable[nr]);
|
|
get_rpccred(cred);
|
|
}
|
|
spin_unlock(&rpc_credcache_lock);
|
|
|
|
rpcauth_destroy_credlist(&free);
|
|
|
|
if (!cred) {
|
|
new = auth->au_ops->crcreate(auth, acred, flags);
|
|
if (!IS_ERR(new)) {
|
|
#ifdef RPC_DEBUG
|
|
new->cr_magic = RPCAUTH_CRED_MAGIC;
|
|
#endif
|
|
goto retry;
|
|
} else
|
|
cred = new;
|
|
} else if ((cred->cr_flags & RPCAUTH_CRED_NEW)
|
|
&& cred->cr_ops->cr_init != NULL
|
|
&& !(flags & RPCAUTH_LOOKUP_NEW)) {
|
|
int res = cred->cr_ops->cr_init(auth, cred);
|
|
if (res < 0) {
|
|
put_rpccred(cred);
|
|
cred = ERR_PTR(res);
|
|
}
|
|
}
|
|
|
|
return (struct rpc_cred *) cred;
|
|
}
|
|
|
|
struct rpc_cred *
|
|
rpcauth_lookupcred(struct rpc_auth *auth, int flags)
|
|
{
|
|
struct auth_cred acred = {
|
|
.uid = current->fsuid,
|
|
.gid = current->fsgid,
|
|
.group_info = current->group_info,
|
|
};
|
|
struct rpc_cred *ret;
|
|
|
|
dprintk("RPC: looking up %s cred\n",
|
|
auth->au_ops->au_name);
|
|
get_group_info(acred.group_info);
|
|
ret = auth->au_ops->lookup_cred(auth, &acred, flags);
|
|
put_group_info(acred.group_info);
|
|
return ret;
|
|
}
|
|
|
|
struct rpc_cred *
|
|
rpcauth_bindcred(struct rpc_task *task)
|
|
{
|
|
struct rpc_auth *auth = task->tk_auth;
|
|
struct auth_cred acred = {
|
|
.uid = current->fsuid,
|
|
.gid = current->fsgid,
|
|
.group_info = current->group_info,
|
|
};
|
|
struct rpc_cred *ret;
|
|
int flags = 0;
|
|
|
|
dprintk("RPC: %4d looking up %s cred\n",
|
|
task->tk_pid, task->tk_auth->au_ops->au_name);
|
|
get_group_info(acred.group_info);
|
|
if (task->tk_flags & RPC_TASK_ROOTCREDS)
|
|
flags |= RPCAUTH_LOOKUP_ROOTCREDS;
|
|
ret = auth->au_ops->lookup_cred(auth, &acred, flags);
|
|
if (!IS_ERR(ret))
|
|
task->tk_msg.rpc_cred = ret;
|
|
else
|
|
task->tk_status = PTR_ERR(ret);
|
|
put_group_info(acred.group_info);
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
rpcauth_holdcred(struct rpc_task *task)
|
|
{
|
|
dprintk("RPC: %4d holding %s cred %p\n",
|
|
task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
|
|
if (task->tk_msg.rpc_cred)
|
|
get_rpccred(task->tk_msg.rpc_cred);
|
|
}
|
|
|
|
void
|
|
put_rpccred(struct rpc_cred *cred)
|
|
{
|
|
cred->cr_expire = jiffies;
|
|
if (!atomic_dec_and_test(&cred->cr_count))
|
|
return;
|
|
cred->cr_ops->crdestroy(cred);
|
|
}
|
|
|
|
void
|
|
rpcauth_unbindcred(struct rpc_task *task)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
|
|
dprintk("RPC: %4d releasing %s cred %p\n",
|
|
task->tk_pid, task->tk_auth->au_ops->au_name, cred);
|
|
|
|
put_rpccred(cred);
|
|
task->tk_msg.rpc_cred = NULL;
|
|
}
|
|
|
|
u32 *
|
|
rpcauth_marshcred(struct rpc_task *task, u32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
|
|
dprintk("RPC: %4d marshaling %s cred %p\n",
|
|
task->tk_pid, task->tk_auth->au_ops->au_name, cred);
|
|
|
|
return cred->cr_ops->crmarshal(task, p);
|
|
}
|
|
|
|
u32 *
|
|
rpcauth_checkverf(struct rpc_task *task, u32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
|
|
dprintk("RPC: %4d validating %s cred %p\n",
|
|
task->tk_pid, task->tk_auth->au_ops->au_name, cred);
|
|
|
|
return cred->cr_ops->crvalidate(task, p);
|
|
}
|
|
|
|
int
|
|
rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp,
|
|
u32 *data, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
|
|
dprintk("RPC: %4d using %s cred %p to wrap rpc data\n",
|
|
task->tk_pid, cred->cr_ops->cr_name, cred);
|
|
if (cred->cr_ops->crwrap_req)
|
|
return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
|
|
/* By default, we encode the arguments normally. */
|
|
return encode(rqstp, data, obj);
|
|
}
|
|
|
|
int
|
|
rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
|
|
u32 *data, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
|
|
dprintk("RPC: %4d using %s cred %p to unwrap rpc data\n",
|
|
task->tk_pid, cred->cr_ops->cr_name, cred);
|
|
if (cred->cr_ops->crunwrap_resp)
|
|
return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
|
|
data, obj);
|
|
/* By default, we decode the arguments normally. */
|
|
return decode(rqstp, data, obj);
|
|
}
|
|
|
|
int
|
|
rpcauth_refreshcred(struct rpc_task *task)
|
|
{
|
|
struct rpc_cred *cred = task->tk_msg.rpc_cred;
|
|
int err;
|
|
|
|
dprintk("RPC: %4d refreshing %s cred %p\n",
|
|
task->tk_pid, task->tk_auth->au_ops->au_name, cred);
|
|
|
|
err = cred->cr_ops->crrefresh(task);
|
|
if (err < 0)
|
|
task->tk_status = err;
|
|
return err;
|
|
}
|
|
|
|
void
|
|
rpcauth_invalcred(struct rpc_task *task)
|
|
{
|
|
dprintk("RPC: %4d invalidating %s cred %p\n",
|
|
task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
|
|
spin_lock(&rpc_credcache_lock);
|
|
if (task->tk_msg.rpc_cred)
|
|
task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
|
|
spin_unlock(&rpc_credcache_lock);
|
|
}
|
|
|
|
int
|
|
rpcauth_uptodatecred(struct rpc_task *task)
|
|
{
|
|
return !(task->tk_msg.rpc_cred) ||
|
|
(task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
|
|
}
|
|
|