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 */ 102e8680a24SChuck Lever static int 103e8680a24SChuck Lever unx_marshal(struct rpc_task *task, struct xdr_stream *xdr) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds struct rpc_clnt *clnt = task->tk_client; 1062edd8d74SNeilBrown struct rpc_cred *cred = task->tk_rqstp->rq_cred; 107e8680a24SChuck Lever __be32 *p, *cred_len, *gidarr_len; 1081da177e4SLinus Torvalds int i; 1092edd8d74SNeilBrown struct group_info *gi = cred->cr_cred->group_info; 1101da177e4SLinus Torvalds 111e8680a24SChuck Lever /* Credential */ 1121da177e4SLinus Torvalds 113e8680a24SChuck Lever p = xdr_reserve_space(xdr, 3 * sizeof(*p)); 114e8680a24SChuck Lever if (!p) 115e8680a24SChuck Lever goto marshal_failed; 116e8680a24SChuck Lever *p++ = rpc_auth_unix; 117e8680a24SChuck Lever cred_len = p++; 118e8680a24SChuck Lever *p++ = xdr_zero; /* stamp */ 119e8680a24SChuck Lever if (xdr_stream_encode_opaque(xdr, clnt->cl_nodename, 120e8680a24SChuck Lever clnt->cl_nodelen) < 0) 121e8680a24SChuck Lever goto marshal_failed; 122e8680a24SChuck Lever p = xdr_reserve_space(xdr, 3 * sizeof(*p)); 123e8680a24SChuck Lever if (!p) 124e8680a24SChuck Lever goto marshal_failed; 125e8680a24SChuck Lever *p++ = cpu_to_be32(from_kuid(&init_user_ns, cred->cr_cred->fsuid)); 126e8680a24SChuck Lever *p++ = cpu_to_be32(from_kgid(&init_user_ns, cred->cr_cred->fsgid)); 1271da177e4SLinus Torvalds 128e8680a24SChuck Lever gidarr_len = p++; 1292edd8d74SNeilBrown if (gi) 1302edd8d74SNeilBrown for (i = 0; i < UNX_NGROUPS && i < gi->ngroups; i++) 131e8680a24SChuck Lever *p++ = cpu_to_be32(from_kgid(&init_user_ns, 132e8680a24SChuck Lever gi->gid[i])); 133e8680a24SChuck Lever *gidarr_len = cpu_to_be32(p - gidarr_len - 1); 134e8680a24SChuck Lever *cred_len = cpu_to_be32((p - cred_len - 1) << 2); 135e8680a24SChuck Lever p = xdr_reserve_space(xdr, (p - gidarr_len - 1) << 2); 136e8680a24SChuck Lever if (!p) 137e8680a24SChuck Lever goto marshal_failed; 1381da177e4SLinus Torvalds 139e8680a24SChuck Lever /* Verifier */ 1401da177e4SLinus Torvalds 141e8680a24SChuck Lever p = xdr_reserve_space(xdr, 2 * sizeof(*p)); 142e8680a24SChuck Lever if (!p) 143e8680a24SChuck Lever goto marshal_failed; 144e8680a24SChuck Lever *p++ = rpc_auth_null; 145e8680a24SChuck Lever *p = xdr_zero; 146e8680a24SChuck Lever 147e8680a24SChuck Lever return 0; 148e8680a24SChuck Lever 149e8680a24SChuck Lever marshal_failed: 150e8680a24SChuck Lever return -EMSGSIZE; 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds /* 1541da177e4SLinus Torvalds * Refresh credentials. This is a no-op for AUTH_UNIX 1551da177e4SLinus Torvalds */ 1561da177e4SLinus Torvalds static int 1571da177e4SLinus Torvalds unx_refresh(struct rpc_task *task) 1581da177e4SLinus Torvalds { 159a17c2153STrond Myklebust set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags); 1601da177e4SLinus Torvalds return 0; 1611da177e4SLinus Torvalds } 1621da177e4SLinus Torvalds 163a0584ee9SChuck Lever static int 164a0584ee9SChuck Lever unx_validate(struct rpc_task *task, struct xdr_stream *xdr) 1651da177e4SLinus Torvalds { 166a0584ee9SChuck Lever __be32 *p; 1671da177e4SLinus Torvalds u32 size; 1681da177e4SLinus Torvalds 169a0584ee9SChuck Lever p = xdr_inline_decode(xdr, 2 * sizeof(*p)); 170a0584ee9SChuck Lever if (!p) 171a0584ee9SChuck Lever return -EIO; 172a0584ee9SChuck Lever switch (*p++) { 173a0584ee9SChuck Lever case rpc_auth_null: 174a0584ee9SChuck Lever case rpc_auth_unix: 175a0584ee9SChuck Lever case rpc_auth_short: 176a0584ee9SChuck Lever break; 177a0584ee9SChuck Lever default: 178a0584ee9SChuck Lever return -EIO; 1791da177e4SLinus Torvalds } 180a0584ee9SChuck Lever size = be32_to_cpup(p); 181a0584ee9SChuck Lever if (size > RPC_MAX_AUTH_SIZE) 182a0584ee9SChuck Lever return -EIO; 183a0584ee9SChuck Lever p = xdr_inline_decode(xdr, size); 184a0584ee9SChuck Lever if (!p) 185a0584ee9SChuck Lever return -EIO; 1861da177e4SLinus Torvalds 187a17c2153STrond Myklebust task->tk_rqstp->rq_cred->cr_auth->au_rslack = (size >> 2) + 2; 188a0584ee9SChuck Lever return 0; 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds 1915d8d9a4dSTrond Myklebust int __init rpc_init_authunix(void) 1929499b434STrond Myklebust { 1932edd8d74SNeilBrown unix_pool = mempool_create_kmalloc_pool(16, sizeof(struct rpc_cred)); 1942edd8d74SNeilBrown return unix_pool ? 0 : -ENOMEM; 1955d8d9a4dSTrond Myklebust } 1965d8d9a4dSTrond Myklebust 1975d8d9a4dSTrond Myklebust void rpc_destroy_authunix(void) 1985d8d9a4dSTrond Myklebust { 1992edd8d74SNeilBrown mempool_destroy(unix_pool); 2009499b434STrond Myklebust } 2019499b434STrond Myklebust 202f1c0a861STrond Myklebust const struct rpc_authops authunix_ops = { 2031da177e4SLinus Torvalds .owner = THIS_MODULE, 2041da177e4SLinus Torvalds .au_flavor = RPC_AUTH_UNIX, 2051da177e4SLinus Torvalds .au_name = "UNIX", 2061da177e4SLinus Torvalds .create = unx_create, 2071da177e4SLinus Torvalds .destroy = unx_destroy, 2081da177e4SLinus Torvalds .lookup_cred = unx_lookup_cred, 2091da177e4SLinus Torvalds }; 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds static 2121da177e4SLinus Torvalds struct rpc_auth unix_auth = { 2134500632fSChuck Lever .au_cslack = UNX_CALLSLACK, 2144500632fSChuck Lever .au_rslack = NUL_REPLYSLACK, 2151da177e4SLinus Torvalds .au_ops = &authunix_ops, 21681039f1fSTrond Myklebust .au_flavor = RPC_AUTH_UNIX, 217331bc71cSTrond Myklebust .au_count = REFCOUNT_INIT(1), 2181da177e4SLinus Torvalds }; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds static 221f1c0a861STrond Myklebust const struct rpc_credops unix_credops = { 2221da177e4SLinus Torvalds .cr_name = "AUTH_UNIX", 2231da177e4SLinus Torvalds .crdestroy = unx_destroy_cred, 2241da177e4SLinus Torvalds .crmatch = unx_match, 2251da177e4SLinus Torvalds .crmarshal = unx_marshal, 226e8680a24SChuck Lever .crwrap_req = rpcauth_wrap_req_encode, 2271da177e4SLinus Torvalds .crrefresh = unx_refresh, 2281da177e4SLinus Torvalds .crvalidate = unx_validate, 229a0584ee9SChuck Lever .crunwrap_resp = rpcauth_unwrap_resp_decode, 2301da177e4SLinus Torvalds }; 231