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![NeilBrown](/assets/img/avatar_default.png)
1/ discard 'struct unx_cred'. We don't need any data that is not already in 'struct rpc_cred'. 2/ Don't keep these creds in a hash table. When a credential is needed, simply allocate it. When not needed, discard it. This can easily be faster than performing a lookup on a shared hash table. As the lookup can happen during write-out, use a mempool to ensure forward progress. This means that we cannot compare two credentials for equality by comparing the pointers, but we never do that anyway. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
214 lines
5 KiB
C
214 lines
5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/net/sunrpc/auth_unix.c
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*
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* UNIX-style authentication; no AUTH_SHORT support
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/mempool.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/user_namespace.h>
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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static struct rpc_auth unix_auth;
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static const struct rpc_credops unix_credops;
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static mempool_t *unix_pool;
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static struct rpc_auth *
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unx_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
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{
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dprintk("RPC: creating UNIX authenticator for client %p\n",
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clnt);
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refcount_inc(&unix_auth.au_count);
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return &unix_auth;
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}
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static void
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unx_destroy(struct rpc_auth *auth)
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{
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dprintk("RPC: destroying UNIX authenticator %p\n", auth);
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}
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/*
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* Lookup AUTH_UNIX creds for current process
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*/
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static struct rpc_cred *
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unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
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{
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struct rpc_cred *ret = mempool_alloc(unix_pool, GFP_NOFS);
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dprintk("RPC: allocating UNIX cred for uid %d gid %d\n",
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from_kuid(&init_user_ns, acred->cred->fsuid),
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from_kgid(&init_user_ns, acred->cred->fsgid));
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rpcauth_init_cred(ret, acred, auth, &unix_credops);
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ret->cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
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return ret;
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}
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static void
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unx_free_cred_callback(struct rcu_head *head)
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{
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struct rpc_cred *rpc_cred = container_of(head, struct rpc_cred, cr_rcu);
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dprintk("RPC: unx_free_cred %p\n", rpc_cred);
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put_cred(rpc_cred->cr_cred);
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mempool_free(rpc_cred, unix_pool);
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}
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static void
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unx_destroy_cred(struct rpc_cred *cred)
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{
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call_rcu(&cred->cr_rcu, unx_free_cred_callback);
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}
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/*
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* Match credentials against current the auth_cred.
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*/
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static int
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unx_match(struct auth_cred *acred, struct rpc_cred *cred, int flags)
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{
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unsigned int groups = 0;
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unsigned int i;
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if (cred->cr_cred == acred->cred)
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return 1;
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if (!uid_eq(cred->cr_cred->fsuid, acred->cred->fsuid) || !gid_eq(cred->cr_cred->fsgid, acred->cred->fsgid))
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return 0;
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if (acred->cred && acred->cred->group_info != NULL)
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groups = acred->cred->group_info->ngroups;
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if (groups > UNX_NGROUPS)
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groups = UNX_NGROUPS;
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if (cred->cr_cred->group_info == NULL)
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return groups == 0;
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if (groups != cred->cr_cred->group_info->ngroups)
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return 0;
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for (i = 0; i < groups ; i++)
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if (!gid_eq(cred->cr_cred->group_info->gid[i], acred->cred->group_info->gid[i]))
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return 0;
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return 1;
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}
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/*
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* Marshal credentials.
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* Maybe we should keep a cached credential for performance reasons.
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*/
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static __be32 *
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unx_marshal(struct rpc_task *task, __be32 *p)
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{
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struct rpc_clnt *clnt = task->tk_client;
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struct rpc_cred *cred = task->tk_rqstp->rq_cred;
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__be32 *base, *hold;
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int i;
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struct group_info *gi = cred->cr_cred->group_info;
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*p++ = htonl(RPC_AUTH_UNIX);
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base = p++;
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*p++ = htonl(jiffies/HZ);
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/*
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* Copy the UTS nodename captured when the client was created.
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*/
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p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen);
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*p++ = htonl((u32) from_kuid(&init_user_ns, cred->cr_cred->fsuid));
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*p++ = htonl((u32) from_kgid(&init_user_ns, cred->cr_cred->fsgid));
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hold = p++;
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if (gi)
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for (i = 0; i < UNX_NGROUPS && i < gi->ngroups; i++)
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*p++ = htonl((u32) from_kgid(&init_user_ns, gi->gid[i]));
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*hold = htonl(p - hold - 1); /* gid array length */
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*base = htonl((p - base - 1) << 2); /* cred length */
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*p++ = htonl(RPC_AUTH_NULL);
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*p++ = htonl(0);
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return p;
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}
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/*
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* Refresh credentials. This is a no-op for AUTH_UNIX
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*/
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static int
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unx_refresh(struct rpc_task *task)
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{
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set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
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return 0;
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}
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static __be32 *
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unx_validate(struct rpc_task *task, __be32 *p)
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{
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rpc_authflavor_t flavor;
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u32 size;
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flavor = ntohl(*p++);
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if (flavor != RPC_AUTH_NULL &&
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flavor != RPC_AUTH_UNIX &&
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flavor != RPC_AUTH_SHORT) {
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printk("RPC: bad verf flavor: %u\n", flavor);
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return ERR_PTR(-EIO);
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}
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size = ntohl(*p++);
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if (size > RPC_MAX_AUTH_SIZE) {
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printk("RPC: giant verf size: %u\n", size);
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return ERR_PTR(-EIO);
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}
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task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2;
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p += (size >> 2);
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return p;
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}
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int __init rpc_init_authunix(void)
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{
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unix_pool = mempool_create_kmalloc_pool(16, sizeof(struct rpc_cred));
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return unix_pool ? 0 : -ENOMEM;
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}
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void rpc_destroy_authunix(void)
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{
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mempool_destroy(unix_pool);
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}
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const struct rpc_authops authunix_ops = {
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.owner = THIS_MODULE,
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.au_flavor = RPC_AUTH_UNIX,
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.au_name = "UNIX",
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.create = unx_create,
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.destroy = unx_destroy,
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.lookup_cred = unx_lookup_cred,
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};
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static
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struct rpc_auth unix_auth = {
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.au_cslack = UNX_CALLSLACK,
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.au_rslack = NUL_REPLYSLACK,
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.au_ops = &authunix_ops,
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.au_flavor = RPC_AUTH_UNIX,
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.au_count = REFCOUNT_INIT(1),
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};
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static
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const struct rpc_credops unix_credops = {
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.cr_name = "AUTH_UNIX",
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.crdestroy = unx_destroy_cred,
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.crmatch = unx_match,
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.crmarshal = unx_marshal,
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.crrefresh = unx_refresh,
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.crvalidate = unx_validate,
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};
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