1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/net/sunrpc/auth_unix.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * UNIX-style authentication; no AUTH_SHORT support 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds 105a0e3ad6STejun Heo #include <linux/slab.h> 111da177e4SLinus Torvalds #include <linux/types.h> 121da177e4SLinus Torvalds #include <linux/sched.h> 131da177e4SLinus Torvalds #include <linux/module.h> 142edd8d74SNeilBrown #include <linux/mempool.h> 151da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 161da177e4SLinus Torvalds #include <linux/sunrpc/auth.h> 17ae2975bcSEric W. Biederman #include <linux/user_namespace.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds 20f895b252SJeff Layton #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 211da177e4SLinus Torvalds # define RPCDBG_FACILITY RPCDBG_AUTH 221da177e4SLinus Torvalds #endif 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds static struct rpc_auth unix_auth; 25f1c0a861STrond Myklebust static const struct rpc_credops unix_credops; 262edd8d74SNeilBrown static mempool_t *unix_pool; 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds static struct rpc_auth * 2982b98ca5SSargun Dhillon unx_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) 301da177e4SLinus Torvalds { 31331bc71cSTrond Myklebust refcount_inc(&unix_auth.au_count); 321da177e4SLinus Torvalds return &unix_auth; 331da177e4SLinus Torvalds } 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds static void 361da177e4SLinus Torvalds unx_destroy(struct rpc_auth *auth) 371da177e4SLinus Torvalds { 381e035d06SFrank Sorenson } 391e035d06SFrank Sorenson 401da177e4SLinus Torvalds /* 411da177e4SLinus Torvalds * Lookup AUTH_UNIX creds for current process 421da177e4SLinus Torvalds */ 431da177e4SLinus Torvalds static struct rpc_cred * 441da177e4SLinus Torvalds unx_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) 451da177e4SLinus Torvalds { 462edd8d74SNeilBrown struct rpc_cred *ret = mempool_alloc(unix_pool, GFP_NOFS); 471da177e4SLinus Torvalds 482edd8d74SNeilBrown rpcauth_init_cred(ret, acred, auth, &unix_credops); 492edd8d74SNeilBrown ret->cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; 502edd8d74SNeilBrown return ret; 5131be5bf1STrond Myklebust } 52696e38dfSTrond Myklebust 5331be5bf1STrond Myklebust static void 5431be5bf1STrond Myklebust unx_free_cred_callback(struct rcu_head *head) 5531be5bf1STrond Myklebust { 562edd8d74SNeilBrown struct rpc_cred *rpc_cred = container_of(head, struct rpc_cred, cr_rcu); 5780125d4aSChuck Lever 582edd8d74SNeilBrown put_cred(rpc_cred->cr_cred); 592edd8d74SNeilBrown mempool_free(rpc_cred, unix_pool); 6031be5bf1STrond Myklebust } 6131be5bf1STrond Myklebust 6231be5bf1STrond Myklebust static void 6331be5bf1STrond Myklebust unx_destroy_cred(struct rpc_cred *cred) 6431be5bf1STrond Myklebust { 6531be5bf1STrond Myklebust call_rcu(&cred->cr_rcu, unx_free_cred_callback); 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds /* 692edd8d74SNeilBrown * Match credentials against current the auth_cred. 701da177e4SLinus Torvalds */ 711da177e4SLinus Torvalds static int 722edd8d74SNeilBrown unx_match(struct auth_cred *acred, struct rpc_cred *cred, int flags) 731da177e4SLinus Torvalds { 74af093835STrond Myklebust unsigned int groups = 0; 75af093835STrond Myklebust unsigned int i; 761da177e4SLinus Torvalds 772edd8d74SNeilBrown if (cred->cr_cred == acred->cred) 782edd8d74SNeilBrown return 1; 791da177e4SLinus Torvalds 802edd8d74SNeilBrown if (!uid_eq(cred->cr_cred->fsuid, acred->cred->fsuid) || !gid_eq(cred->cr_cred->fsgid, acred->cred->fsgid)) 811da177e4SLinus Torvalds return 0; 821da177e4SLinus Torvalds 83fc0664fdSNeilBrown if (acred->cred && acred->cred->group_info != NULL) 84fc0664fdSNeilBrown groups = acred->cred->group_info->ngroups; 855786461bSKinglong Mee if (groups > UNX_NGROUPS) 865786461bSKinglong Mee groups = UNX_NGROUPS; 872edd8d74SNeilBrown if (cred->cr_cred->group_info == NULL) 882edd8d74SNeilBrown return groups == 0; 892edd8d74SNeilBrown if (groups != cred->cr_cred->group_info->ngroups) 901da177e4SLinus Torvalds return 0; 912edd8d74SNeilBrown 922edd8d74SNeilBrown for (i = 0; i < groups ; i++) 932edd8d74SNeilBrown if (!gid_eq(cred->cr_cred->group_info->gid[i], acred->cred->group_info->gid[i])) 94dc6f55e9SNeilBrown return 0; 951da177e4SLinus Torvalds return 1; 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /* 991da177e4SLinus Torvalds * Marshal credentials. 1001da177e4SLinus Torvalds * Maybe we should keep a cached credential for performance reasons. 1011da177e4SLinus Torvalds */ 102d8ed029dSAlexey Dobriyan static __be32 * 103d8ed029dSAlexey Dobriyan unx_marshal(struct rpc_task *task, __be32 *p) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds struct rpc_clnt *clnt = task->tk_client; 1062edd8d74SNeilBrown struct rpc_cred *cred = task->tk_rqstp->rq_cred; 107d8ed029dSAlexey Dobriyan __be32 *base, *hold; 1081da177e4SLinus Torvalds int i; 1092edd8d74SNeilBrown struct group_info *gi = cred->cr_cred->group_info; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_UNIX); 1121da177e4SLinus Torvalds base = p++; 1131da177e4SLinus Torvalds *p++ = htonl(jiffies/HZ); 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds /* 1161da177e4SLinus Torvalds * Copy the UTS nodename captured when the client was created. 1171da177e4SLinus Torvalds */ 1181da177e4SLinus Torvalds p = xdr_encode_array(p, clnt->cl_nodename, clnt->cl_nodelen); 1191da177e4SLinus Torvalds 1202edd8d74SNeilBrown *p++ = htonl((u32) from_kuid(&init_user_ns, cred->cr_cred->fsuid)); 1212edd8d74SNeilBrown *p++ = htonl((u32) from_kgid(&init_user_ns, cred->cr_cred->fsgid)); 1221da177e4SLinus Torvalds hold = p++; 1232edd8d74SNeilBrown if (gi) 1242edd8d74SNeilBrown for (i = 0; i < UNX_NGROUPS && i < gi->ngroups; i++) 1252edd8d74SNeilBrown *p++ = htonl((u32) from_kgid(&init_user_ns, gi->gid[i])); 1261da177e4SLinus Torvalds *hold = htonl(p - hold - 1); /* gid array length */ 1271da177e4SLinus Torvalds *base = htonl((p - base - 1) << 2); /* cred length */ 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds *p++ = htonl(RPC_AUTH_NULL); 1301da177e4SLinus Torvalds *p++ = htonl(0); 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds return p; 1331da177e4SLinus Torvalds } 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds /* 1361da177e4SLinus Torvalds * Refresh credentials. This is a no-op for AUTH_UNIX 1371da177e4SLinus Torvalds */ 1381da177e4SLinus Torvalds static int 1391da177e4SLinus Torvalds unx_refresh(struct rpc_task *task) 1401da177e4SLinus Torvalds { 141a17c2153STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags); 1421da177e4SLinus Torvalds return 0; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds 145d8ed029dSAlexey Dobriyan static __be32 * 146d8ed029dSAlexey Dobriyan unx_validate(struct rpc_task *task, __be32 *p) 1471da177e4SLinus Torvalds { 1481da177e4SLinus Torvalds rpc_authflavor_t flavor; 1491da177e4SLinus Torvalds u32 size; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds flavor = ntohl(*p++); 1521da177e4SLinus Torvalds if (flavor != RPC_AUTH_NULL && 1531da177e4SLinus Torvalds flavor != RPC_AUTH_UNIX && 1541da177e4SLinus Torvalds flavor != RPC_AUTH_SHORT) { 1551da177e4SLinus Torvalds printk("RPC: bad verf flavor: %u\n", flavor); 15635fa5f7bSAndy Adamson return ERR_PTR(-EIO); 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds size = ntohl(*p++); 1601da177e4SLinus Torvalds if (size > RPC_MAX_AUTH_SIZE) { 1611da177e4SLinus Torvalds printk("RPC: giant verf size: %u\n", size); 16235fa5f7bSAndy Adamson return ERR_PTR(-EIO); 1631da177e4SLinus Torvalds } 164a17c2153STrond Myklebust task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2; 1651da177e4SLinus Torvalds p += (size >> 2); 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds return p; 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds 1705d8d9a4dSTrond Myklebust int __init rpc_init_authunix(void) 1719499b434STrond Myklebust { 1722edd8d74SNeilBrown unix_pool = mempool_create_kmalloc_pool(16, sizeof(struct rpc_cred)); 1732edd8d74SNeilBrown return unix_pool ? 0 : -ENOMEM; 1745d8d9a4dSTrond Myklebust } 1755d8d9a4dSTrond Myklebust 1765d8d9a4dSTrond Myklebust void rpc_destroy_authunix(void) 1775d8d9a4dSTrond Myklebust { 1782edd8d74SNeilBrown mempool_destroy(unix_pool); 1799499b434STrond Myklebust } 1809499b434STrond Myklebust 181f1c0a861STrond Myklebust const struct rpc_authops authunix_ops = { 1821da177e4SLinus Torvalds .owner = THIS_MODULE, 1831da177e4SLinus Torvalds .au_flavor = RPC_AUTH_UNIX, 1841da177e4SLinus Torvalds .au_name = "UNIX", 1851da177e4SLinus Torvalds .create = unx_create, 1861da177e4SLinus Torvalds .destroy = unx_destroy, 1871da177e4SLinus Torvalds .lookup_cred = unx_lookup_cred, 1881da177e4SLinus Torvalds }; 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds static 1911da177e4SLinus Torvalds struct rpc_auth unix_auth = { 1924500632fSChuck Lever .au_cslack = UNX_CALLSLACK, 1934500632fSChuck Lever .au_rslack = NUL_REPLYSLACK, 1941da177e4SLinus Torvalds .au_ops = &authunix_ops, 19581039f1fSTrond Myklebust .au_flavor = RPC_AUTH_UNIX, 196331bc71cSTrond Myklebust .au_count = REFCOUNT_INIT(1), 1971da177e4SLinus Torvalds }; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds static 200f1c0a861STrond Myklebust const struct rpc_credops unix_credops = { 2011da177e4SLinus Torvalds .cr_name = "AUTH_UNIX", 2021da177e4SLinus Torvalds .crdestroy = unx_destroy_cred, 2031da177e4SLinus Torvalds .crmatch = unx_match, 2041da177e4SLinus Torvalds .crmarshal = unx_marshal, 2051da177e4SLinus Torvalds .crrefresh = unx_refresh, 2061da177e4SLinus Torvalds .crvalidate = unx_validate, 2071da177e4SLinus Torvalds }; 208