12bfc50bcSEdward Tomasz Napierala /*- 22bfc50bcSEdward Tomasz Napierala * Copyright (c) 2011 The FreeBSD Foundation 32bfc50bcSEdward Tomasz Napierala * All rights reserved. 42bfc50bcSEdward Tomasz Napierala * 52bfc50bcSEdward Tomasz Napierala * This software was developed by Edward Tomasz Napierala under sponsorship 62bfc50bcSEdward Tomasz Napierala * from the FreeBSD Foundation. 72bfc50bcSEdward Tomasz Napierala * 82bfc50bcSEdward Tomasz Napierala * Redistribution and use in source and binary forms, with or without 92bfc50bcSEdward Tomasz Napierala * modification, are permitted provided that the following conditions 102bfc50bcSEdward Tomasz Napierala * are met: 112bfc50bcSEdward Tomasz Napierala * 1. Redistributions of source code must retain the above copyright 122bfc50bcSEdward Tomasz Napierala * notice, this list of conditions and the following disclaimer. 132bfc50bcSEdward Tomasz Napierala * 2. Redistributions in binary form must reproduce the above copyright 142bfc50bcSEdward Tomasz Napierala * notice, this list of conditions and the following disclaimer in the 152bfc50bcSEdward Tomasz Napierala * documentation and/or other materials provided with the distribution. 162bfc50bcSEdward Tomasz Napierala * 172bfc50bcSEdward Tomasz Napierala * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 182bfc50bcSEdward Tomasz Napierala * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 192bfc50bcSEdward Tomasz Napierala * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 202bfc50bcSEdward Tomasz Napierala * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 212bfc50bcSEdward Tomasz Napierala * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 222bfc50bcSEdward Tomasz Napierala * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 232bfc50bcSEdward Tomasz Napierala * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 242bfc50bcSEdward Tomasz Napierala * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 252bfc50bcSEdward Tomasz Napierala * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 262bfc50bcSEdward Tomasz Napierala * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 272bfc50bcSEdward Tomasz Napierala * SUCH DAMAGE. 282bfc50bcSEdward Tomasz Napierala * 292bfc50bcSEdward Tomasz Napierala * $FreeBSD$ 302bfc50bcSEdward Tomasz Napierala */ 312bfc50bcSEdward Tomasz Napierala 322bfc50bcSEdward Tomasz Napierala /* 332bfc50bcSEdward Tomasz Napierala * Processes may set login class name using setloginclass(2). This 342bfc50bcSEdward Tomasz Napierala * is usually done through call to setusercontext(3), by programs 352bfc50bcSEdward Tomasz Napierala * such as login(1), based on information from master.passwd(5). Kernel 362bfc50bcSEdward Tomasz Napierala * uses this information to enforce per-class resource limits. Current 372bfc50bcSEdward Tomasz Napierala * login class can be determined using id(1). Login class is inherited 382bfc50bcSEdward Tomasz Napierala * from the parent process during fork(2). If not set, it defaults 392bfc50bcSEdward Tomasz Napierala * to "default". 402bfc50bcSEdward Tomasz Napierala * 412bfc50bcSEdward Tomasz Napierala * Code in this file implements setloginclass(2) and getloginclass(2) 422bfc50bcSEdward Tomasz Napierala * system calls, and maintains class name storage and retrieval. 432bfc50bcSEdward Tomasz Napierala */ 442bfc50bcSEdward Tomasz Napierala 452bfc50bcSEdward Tomasz Napierala #include <sys/cdefs.h> 462bfc50bcSEdward Tomasz Napierala __FBSDID("$FreeBSD$"); 472bfc50bcSEdward Tomasz Napierala 482bfc50bcSEdward Tomasz Napierala #include <sys/param.h> 492bfc50bcSEdward Tomasz Napierala #include <sys/eventhandler.h> 502bfc50bcSEdward Tomasz Napierala #include <sys/kernel.h> 512bfc50bcSEdward Tomasz Napierala #include <sys/lock.h> 522bfc50bcSEdward Tomasz Napierala #include <sys/loginclass.h> 532bfc50bcSEdward Tomasz Napierala #include <sys/malloc.h> 542bfc50bcSEdward Tomasz Napierala #include <sys/mutex.h> 552bfc50bcSEdward Tomasz Napierala #include <sys/types.h> 562bfc50bcSEdward Tomasz Napierala #include <sys/priv.h> 572bfc50bcSEdward Tomasz Napierala #include <sys/proc.h> 582bfc50bcSEdward Tomasz Napierala #include <sys/queue.h> 59097055e2SEdward Tomasz Napierala #include <sys/racct.h> 602bfc50bcSEdward Tomasz Napierala #include <sys/refcount.h> 612bfc50bcSEdward Tomasz Napierala #include <sys/sysproto.h> 622bfc50bcSEdward Tomasz Napierala #include <sys/systm.h> 632bfc50bcSEdward Tomasz Napierala 642bfc50bcSEdward Tomasz Napierala static MALLOC_DEFINE(M_LOGINCLASS, "loginclass", "loginclass structures"); 652bfc50bcSEdward Tomasz Napierala 662bfc50bcSEdward Tomasz Napierala LIST_HEAD(, loginclass) loginclasses; 672bfc50bcSEdward Tomasz Napierala 682bfc50bcSEdward Tomasz Napierala /* 692bfc50bcSEdward Tomasz Napierala * Lock protecting loginclasses list. 702bfc50bcSEdward Tomasz Napierala */ 712bfc50bcSEdward Tomasz Napierala static struct mtx loginclasses_lock; 722bfc50bcSEdward Tomasz Napierala 732bfc50bcSEdward Tomasz Napierala static void lc_init(void); 742bfc50bcSEdward Tomasz Napierala SYSINIT(loginclass, SI_SUB_CPU, SI_ORDER_FIRST, lc_init, NULL); 752bfc50bcSEdward Tomasz Napierala 762bfc50bcSEdward Tomasz Napierala void 772bfc50bcSEdward Tomasz Napierala loginclass_hold(struct loginclass *lc) 782bfc50bcSEdward Tomasz Napierala { 792bfc50bcSEdward Tomasz Napierala 802bfc50bcSEdward Tomasz Napierala refcount_acquire(&lc->lc_refcount); 812bfc50bcSEdward Tomasz Napierala } 822bfc50bcSEdward Tomasz Napierala 832bfc50bcSEdward Tomasz Napierala void 842bfc50bcSEdward Tomasz Napierala loginclass_free(struct loginclass *lc) 852bfc50bcSEdward Tomasz Napierala { 862bfc50bcSEdward Tomasz Napierala int old; 872bfc50bcSEdward Tomasz Napierala 882bfc50bcSEdward Tomasz Napierala old = lc->lc_refcount; 892bfc50bcSEdward Tomasz Napierala if (old > 1 && atomic_cmpset_int(&lc->lc_refcount, old, old - 1)) 902bfc50bcSEdward Tomasz Napierala return; 912bfc50bcSEdward Tomasz Napierala 922bfc50bcSEdward Tomasz Napierala mtx_lock(&loginclasses_lock); 932bfc50bcSEdward Tomasz Napierala if (refcount_release(&lc->lc_refcount)) { 94097055e2SEdward Tomasz Napierala racct_destroy(&lc->lc_racct); 952bfc50bcSEdward Tomasz Napierala LIST_REMOVE(lc, lc_next); 962bfc50bcSEdward Tomasz Napierala mtx_unlock(&loginclasses_lock); 972bfc50bcSEdward Tomasz Napierala free(lc, M_LOGINCLASS); 982bfc50bcSEdward Tomasz Napierala 992bfc50bcSEdward Tomasz Napierala return; 1002bfc50bcSEdward Tomasz Napierala } 1012bfc50bcSEdward Tomasz Napierala mtx_unlock(&loginclasses_lock); 1022bfc50bcSEdward Tomasz Napierala } 1032bfc50bcSEdward Tomasz Napierala 1042bfc50bcSEdward Tomasz Napierala /* 1052bfc50bcSEdward Tomasz Napierala * Return loginclass structure with a corresponding name. Not 1062bfc50bcSEdward Tomasz Napierala * performance critical, as it's used mainly by setloginclass(2), 1072bfc50bcSEdward Tomasz Napierala * which happens once per login session. Caller has to use 1082bfc50bcSEdward Tomasz Napierala * loginclass_free() on the returned value when it's no longer 1092bfc50bcSEdward Tomasz Napierala * needed. 1102bfc50bcSEdward Tomasz Napierala */ 1112bfc50bcSEdward Tomasz Napierala struct loginclass * 1122bfc50bcSEdward Tomasz Napierala loginclass_find(const char *name) 1132bfc50bcSEdward Tomasz Napierala { 1142bfc50bcSEdward Tomasz Napierala struct loginclass *lc, *newlc; 1152bfc50bcSEdward Tomasz Napierala 1162bfc50bcSEdward Tomasz Napierala if (name[0] == '\0' || strlen(name) >= MAXLOGNAME) 1172bfc50bcSEdward Tomasz Napierala return (NULL); 1182bfc50bcSEdward Tomasz Napierala 1192bfc50bcSEdward Tomasz Napierala newlc = malloc(sizeof(*newlc), M_LOGINCLASS, M_ZERO | M_WAITOK); 120097055e2SEdward Tomasz Napierala racct_create(&newlc->lc_racct); 1212bfc50bcSEdward Tomasz Napierala 1222bfc50bcSEdward Tomasz Napierala mtx_lock(&loginclasses_lock); 1232bfc50bcSEdward Tomasz Napierala LIST_FOREACH(lc, &loginclasses, lc_next) { 1242bfc50bcSEdward Tomasz Napierala if (strcmp(name, lc->lc_name) != 0) 1252bfc50bcSEdward Tomasz Napierala continue; 1262bfc50bcSEdward Tomasz Napierala 1272bfc50bcSEdward Tomasz Napierala /* Found loginclass with a matching name? */ 1282bfc50bcSEdward Tomasz Napierala loginclass_hold(lc); 1292bfc50bcSEdward Tomasz Napierala mtx_unlock(&loginclasses_lock); 130097055e2SEdward Tomasz Napierala racct_destroy(&newlc->lc_racct); 1312bfc50bcSEdward Tomasz Napierala free(newlc, M_LOGINCLASS); 1322bfc50bcSEdward Tomasz Napierala return (lc); 1332bfc50bcSEdward Tomasz Napierala } 1342bfc50bcSEdward Tomasz Napierala 1352bfc50bcSEdward Tomasz Napierala /* Add new loginclass. */ 1362bfc50bcSEdward Tomasz Napierala strcpy(newlc->lc_name, name); 1372bfc50bcSEdward Tomasz Napierala refcount_init(&newlc->lc_refcount, 1); 1382bfc50bcSEdward Tomasz Napierala LIST_INSERT_HEAD(&loginclasses, newlc, lc_next); 1392bfc50bcSEdward Tomasz Napierala mtx_unlock(&loginclasses_lock); 1402bfc50bcSEdward Tomasz Napierala 1412bfc50bcSEdward Tomasz Napierala return (newlc); 1422bfc50bcSEdward Tomasz Napierala } 1432bfc50bcSEdward Tomasz Napierala 1442bfc50bcSEdward Tomasz Napierala /* 1452bfc50bcSEdward Tomasz Napierala * Get login class name. 1462bfc50bcSEdward Tomasz Napierala */ 1472bfc50bcSEdward Tomasz Napierala #ifndef _SYS_SYSPROTO_H_ 1482bfc50bcSEdward Tomasz Napierala struct getloginclass_args { 1492bfc50bcSEdward Tomasz Napierala char *namebuf; 1502bfc50bcSEdward Tomasz Napierala size_t namelen; 1512bfc50bcSEdward Tomasz Napierala }; 1522bfc50bcSEdward Tomasz Napierala #endif 1532bfc50bcSEdward Tomasz Napierala /* ARGSUSED */ 1542bfc50bcSEdward Tomasz Napierala int 155*8451d0ddSKip Macy sys_getloginclass(struct thread *td, struct getloginclass_args *uap) 1562bfc50bcSEdward Tomasz Napierala { 1572bfc50bcSEdward Tomasz Napierala int error = 0; 1582bfc50bcSEdward Tomasz Napierala size_t lcnamelen; 1592bfc50bcSEdward Tomasz Napierala struct proc *p; 1602bfc50bcSEdward Tomasz Napierala struct loginclass *lc; 1612bfc50bcSEdward Tomasz Napierala 1622bfc50bcSEdward Tomasz Napierala p = td->td_proc; 1632bfc50bcSEdward Tomasz Napierala PROC_LOCK(p); 1642bfc50bcSEdward Tomasz Napierala lc = p->p_ucred->cr_loginclass; 1652bfc50bcSEdward Tomasz Napierala loginclass_hold(lc); 1662bfc50bcSEdward Tomasz Napierala PROC_UNLOCK(p); 1672bfc50bcSEdward Tomasz Napierala 1682bfc50bcSEdward Tomasz Napierala lcnamelen = strlen(lc->lc_name) + 1; 1692bfc50bcSEdward Tomasz Napierala if (lcnamelen > uap->namelen) 1702bfc50bcSEdward Tomasz Napierala error = ERANGE; 1712bfc50bcSEdward Tomasz Napierala if (error == 0) 1722bfc50bcSEdward Tomasz Napierala error = copyout(lc->lc_name, uap->namebuf, lcnamelen); 1732bfc50bcSEdward Tomasz Napierala loginclass_free(lc); 1742bfc50bcSEdward Tomasz Napierala return (error); 1752bfc50bcSEdward Tomasz Napierala } 1762bfc50bcSEdward Tomasz Napierala 1772bfc50bcSEdward Tomasz Napierala /* 1782bfc50bcSEdward Tomasz Napierala * Set login class name. 1792bfc50bcSEdward Tomasz Napierala */ 1802bfc50bcSEdward Tomasz Napierala #ifndef _SYS_SYSPROTO_H_ 1812bfc50bcSEdward Tomasz Napierala struct setloginclass_args { 1822bfc50bcSEdward Tomasz Napierala const char *namebuf; 1832bfc50bcSEdward Tomasz Napierala }; 1842bfc50bcSEdward Tomasz Napierala #endif 1852bfc50bcSEdward Tomasz Napierala /* ARGSUSED */ 1862bfc50bcSEdward Tomasz Napierala int 187*8451d0ddSKip Macy sys_setloginclass(struct thread *td, struct setloginclass_args *uap) 1882bfc50bcSEdward Tomasz Napierala { 1892bfc50bcSEdward Tomasz Napierala struct proc *p = td->td_proc; 1902bfc50bcSEdward Tomasz Napierala int error; 1912bfc50bcSEdward Tomasz Napierala char lcname[MAXLOGNAME]; 1922bfc50bcSEdward Tomasz Napierala struct loginclass *newlc; 1932bfc50bcSEdward Tomasz Napierala struct ucred *newcred, *oldcred; 1942bfc50bcSEdward Tomasz Napierala 1952bfc50bcSEdward Tomasz Napierala error = priv_check(td, PRIV_PROC_SETLOGINCLASS); 1962bfc50bcSEdward Tomasz Napierala if (error != 0) 1972bfc50bcSEdward Tomasz Napierala return (error); 1982bfc50bcSEdward Tomasz Napierala error = copyinstr(uap->namebuf, lcname, sizeof(lcname), NULL); 1992bfc50bcSEdward Tomasz Napierala if (error != 0) 2002bfc50bcSEdward Tomasz Napierala return (error); 2012bfc50bcSEdward Tomasz Napierala 2022bfc50bcSEdward Tomasz Napierala newlc = loginclass_find(lcname); 2032bfc50bcSEdward Tomasz Napierala if (newlc == NULL) 2042bfc50bcSEdward Tomasz Napierala return (EINVAL); 2052bfc50bcSEdward Tomasz Napierala newcred = crget(); 2062bfc50bcSEdward Tomasz Napierala 2072bfc50bcSEdward Tomasz Napierala PROC_LOCK(p); 2082bfc50bcSEdward Tomasz Napierala oldcred = crcopysafe(p, newcred); 2092bfc50bcSEdward Tomasz Napierala newcred->cr_loginclass = newlc; 2102bfc50bcSEdward Tomasz Napierala p->p_ucred = newcred; 2112bfc50bcSEdward Tomasz Napierala PROC_UNLOCK(p); 212097055e2SEdward Tomasz Napierala #ifdef RACCT 213097055e2SEdward Tomasz Napierala racct_proc_ucred_changed(p, oldcred, newcred); 214097055e2SEdward Tomasz Napierala #endif 2152bfc50bcSEdward Tomasz Napierala loginclass_free(oldcred->cr_loginclass); 2162bfc50bcSEdward Tomasz Napierala crfree(oldcred); 2172bfc50bcSEdward Tomasz Napierala 2182bfc50bcSEdward Tomasz Napierala return (0); 2192bfc50bcSEdward Tomasz Napierala } 2202bfc50bcSEdward Tomasz Napierala 221097055e2SEdward Tomasz Napierala void 222097055e2SEdward Tomasz Napierala loginclass_racct_foreach(void (*callback)(struct racct *racct, 223097055e2SEdward Tomasz Napierala void *arg2, void *arg3), void *arg2, void *arg3) 224097055e2SEdward Tomasz Napierala { 225097055e2SEdward Tomasz Napierala struct loginclass *lc; 226097055e2SEdward Tomasz Napierala 227097055e2SEdward Tomasz Napierala mtx_lock(&loginclasses_lock); 228097055e2SEdward Tomasz Napierala LIST_FOREACH(lc, &loginclasses, lc_next) 229097055e2SEdward Tomasz Napierala (callback)(lc->lc_racct, arg2, arg3); 230097055e2SEdward Tomasz Napierala mtx_unlock(&loginclasses_lock); 231097055e2SEdward Tomasz Napierala } 232097055e2SEdward Tomasz Napierala 2332bfc50bcSEdward Tomasz Napierala static void 2342bfc50bcSEdward Tomasz Napierala lc_init(void) 2352bfc50bcSEdward Tomasz Napierala { 2362bfc50bcSEdward Tomasz Napierala 2372bfc50bcSEdward Tomasz Napierala mtx_init(&loginclasses_lock, "loginclasses lock", NULL, MTX_DEF); 2382bfc50bcSEdward Tomasz Napierala } 239