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/types.h> 552bfc50bcSEdward Tomasz Napierala #include <sys/priv.h> 562bfc50bcSEdward Tomasz Napierala #include <sys/proc.h> 572bfc50bcSEdward Tomasz Napierala #include <sys/queue.h> 58097055e2SEdward Tomasz Napierala #include <sys/racct.h> 592bfc50bcSEdward Tomasz Napierala #include <sys/refcount.h> 60*b720dc97SMateusz Guzik #include <sys/rwlock.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 */ 71*b720dc97SMateusz Guzik static struct rwlock loginclasses_lock; 72*b720dc97SMateusz Guzik RW_SYSINIT(loginclasses_init, &loginclasses_lock, "loginclasses lock"); 732bfc50bcSEdward Tomasz Napierala 742bfc50bcSEdward Tomasz Napierala void 752bfc50bcSEdward Tomasz Napierala loginclass_hold(struct loginclass *lc) 762bfc50bcSEdward Tomasz Napierala { 772bfc50bcSEdward Tomasz Napierala 782bfc50bcSEdward Tomasz Napierala refcount_acquire(&lc->lc_refcount); 792bfc50bcSEdward Tomasz Napierala } 802bfc50bcSEdward Tomasz Napierala 812bfc50bcSEdward Tomasz Napierala void 822bfc50bcSEdward Tomasz Napierala loginclass_free(struct loginclass *lc) 832bfc50bcSEdward Tomasz Napierala { 842bfc50bcSEdward Tomasz Napierala int old; 852bfc50bcSEdward Tomasz Napierala 862bfc50bcSEdward Tomasz Napierala old = lc->lc_refcount; 872bfc50bcSEdward Tomasz Napierala if (old > 1 && atomic_cmpset_int(&lc->lc_refcount, old, old - 1)) 882bfc50bcSEdward Tomasz Napierala return; 892bfc50bcSEdward Tomasz Napierala 90*b720dc97SMateusz Guzik rw_wlock(&loginclasses_lock); 91*b720dc97SMateusz Guzik if (!refcount_release(&lc->lc_refcount)) { 92*b720dc97SMateusz Guzik rw_wunlock(&loginclasses_lock); 932bfc50bcSEdward Tomasz Napierala return; 942bfc50bcSEdward Tomasz Napierala } 95*b720dc97SMateusz Guzik 96*b720dc97SMateusz Guzik racct_destroy(&lc->lc_racct); 97*b720dc97SMateusz Guzik LIST_REMOVE(lc, lc_next); 98*b720dc97SMateusz Guzik rw_wunlock(&loginclasses_lock); 99*b720dc97SMateusz Guzik 100*b720dc97SMateusz Guzik free(lc, M_LOGINCLASS); 101*b720dc97SMateusz Guzik } 102*b720dc97SMateusz Guzik 103*b720dc97SMateusz Guzik /* 104*b720dc97SMateusz Guzik * Look up a loginclass struct for the parameter name. 105*b720dc97SMateusz Guzik * loginclasses_lock must be locked. 106*b720dc97SMateusz Guzik * Increase refcount on loginclass struct returned. 107*b720dc97SMateusz Guzik */ 108*b720dc97SMateusz Guzik static struct loginclass * 109*b720dc97SMateusz Guzik loginclass_lookup(const char *name) 110*b720dc97SMateusz Guzik { 111*b720dc97SMateusz Guzik struct loginclass *lc; 112*b720dc97SMateusz Guzik 113*b720dc97SMateusz Guzik rw_assert(&loginclasses_lock, RA_LOCKED); 114*b720dc97SMateusz Guzik LIST_FOREACH(lc, &loginclasses, lc_next) 115*b720dc97SMateusz Guzik if (strcmp(name, lc->lc_name) == 0) { 116*b720dc97SMateusz Guzik loginclass_hold(lc); 117*b720dc97SMateusz Guzik break; 118*b720dc97SMateusz Guzik } 119*b720dc97SMateusz Guzik 120*b720dc97SMateusz Guzik return (lc); 1212bfc50bcSEdward Tomasz Napierala } 1222bfc50bcSEdward Tomasz Napierala 1232bfc50bcSEdward Tomasz Napierala /* 1242bfc50bcSEdward Tomasz Napierala * Return loginclass structure with a corresponding name. Not 1252bfc50bcSEdward Tomasz Napierala * performance critical, as it's used mainly by setloginclass(2), 1262bfc50bcSEdward Tomasz Napierala * which happens once per login session. Caller has to use 1272bfc50bcSEdward Tomasz Napierala * loginclass_free() on the returned value when it's no longer 1282bfc50bcSEdward Tomasz Napierala * needed. 1292bfc50bcSEdward Tomasz Napierala */ 1302bfc50bcSEdward Tomasz Napierala struct loginclass * 1312bfc50bcSEdward Tomasz Napierala loginclass_find(const char *name) 1322bfc50bcSEdward Tomasz Napierala { 133*b720dc97SMateusz Guzik struct loginclass *lc, *new_lc; 1342bfc50bcSEdward Tomasz Napierala 1352bfc50bcSEdward Tomasz Napierala if (name[0] == '\0' || strlen(name) >= MAXLOGNAME) 1362bfc50bcSEdward Tomasz Napierala return (NULL); 1372bfc50bcSEdward Tomasz Napierala 138*b720dc97SMateusz Guzik rw_rlock(&loginclasses_lock); 139*b720dc97SMateusz Guzik lc = loginclass_lookup(name); 140*b720dc97SMateusz Guzik rw_runlock(&loginclasses_lock); 141*b720dc97SMateusz Guzik if (lc != NULL) 1422bfc50bcSEdward Tomasz Napierala return (lc); 143*b720dc97SMateusz Guzik 144*b720dc97SMateusz Guzik new_lc = malloc(sizeof(*new_lc), M_LOGINCLASS, M_ZERO | M_WAITOK); 145*b720dc97SMateusz Guzik racct_create(&new_lc->lc_racct); 146*b720dc97SMateusz Guzik refcount_init(&new_lc->lc_refcount, 1); 147*b720dc97SMateusz Guzik strcpy(new_lc->lc_name, name); 148*b720dc97SMateusz Guzik 149*b720dc97SMateusz Guzik rw_wlock(&loginclasses_lock); 150*b720dc97SMateusz Guzik /* 151*b720dc97SMateusz Guzik * There's a chance someone created our loginclass while we 152*b720dc97SMateusz Guzik * were in malloc and not holding the lock, so we have to 153*b720dc97SMateusz Guzik * make sure we don't insert a duplicate loginclass. 154*b720dc97SMateusz Guzik */ 155*b720dc97SMateusz Guzik if ((lc = loginclass_lookup(name)) == NULL) { 156*b720dc97SMateusz Guzik LIST_INSERT_HEAD(&loginclasses, new_lc, lc_next); 157*b720dc97SMateusz Guzik rw_wunlock(&loginclasses_lock); 158*b720dc97SMateusz Guzik lc = new_lc; 159*b720dc97SMateusz Guzik } else { 160*b720dc97SMateusz Guzik rw_wunlock(&loginclasses_lock); 161*b720dc97SMateusz Guzik racct_destroy(&new_lc->lc_racct); 162*b720dc97SMateusz Guzik free(new_lc, M_LOGINCLASS); 1632bfc50bcSEdward Tomasz Napierala } 1642bfc50bcSEdward Tomasz Napierala 165*b720dc97SMateusz Guzik return (lc); 1662bfc50bcSEdward Tomasz Napierala } 1672bfc50bcSEdward Tomasz Napierala 1682bfc50bcSEdward Tomasz Napierala /* 1692bfc50bcSEdward Tomasz Napierala * Get login class name. 1702bfc50bcSEdward Tomasz Napierala */ 1712bfc50bcSEdward Tomasz Napierala #ifndef _SYS_SYSPROTO_H_ 1722bfc50bcSEdward Tomasz Napierala struct getloginclass_args { 1732bfc50bcSEdward Tomasz Napierala char *namebuf; 1742bfc50bcSEdward Tomasz Napierala size_t namelen; 1752bfc50bcSEdward Tomasz Napierala }; 1762bfc50bcSEdward Tomasz Napierala #endif 1772bfc50bcSEdward Tomasz Napierala /* ARGSUSED */ 1782bfc50bcSEdward Tomasz Napierala int 1798451d0ddSKip Macy sys_getloginclass(struct thread *td, struct getloginclass_args *uap) 1802bfc50bcSEdward Tomasz Napierala { 1812bfc50bcSEdward Tomasz Napierala int error = 0; 1822bfc50bcSEdward Tomasz Napierala size_t lcnamelen; 1832bfc50bcSEdward Tomasz Napierala struct proc *p; 1842bfc50bcSEdward Tomasz Napierala struct loginclass *lc; 1852bfc50bcSEdward Tomasz Napierala 1862bfc50bcSEdward Tomasz Napierala p = td->td_proc; 1872bfc50bcSEdward Tomasz Napierala PROC_LOCK(p); 1882bfc50bcSEdward Tomasz Napierala lc = p->p_ucred->cr_loginclass; 1892bfc50bcSEdward Tomasz Napierala loginclass_hold(lc); 1902bfc50bcSEdward Tomasz Napierala PROC_UNLOCK(p); 1912bfc50bcSEdward Tomasz Napierala 1922bfc50bcSEdward Tomasz Napierala lcnamelen = strlen(lc->lc_name) + 1; 1932bfc50bcSEdward Tomasz Napierala if (lcnamelen > uap->namelen) 1942bfc50bcSEdward Tomasz Napierala error = ERANGE; 1952bfc50bcSEdward Tomasz Napierala if (error == 0) 1962bfc50bcSEdward Tomasz Napierala error = copyout(lc->lc_name, uap->namebuf, lcnamelen); 1972bfc50bcSEdward Tomasz Napierala loginclass_free(lc); 1982bfc50bcSEdward Tomasz Napierala return (error); 1992bfc50bcSEdward Tomasz Napierala } 2002bfc50bcSEdward Tomasz Napierala 2012bfc50bcSEdward Tomasz Napierala /* 2022bfc50bcSEdward Tomasz Napierala * Set login class name. 2032bfc50bcSEdward Tomasz Napierala */ 2042bfc50bcSEdward Tomasz Napierala #ifndef _SYS_SYSPROTO_H_ 2052bfc50bcSEdward Tomasz Napierala struct setloginclass_args { 2062bfc50bcSEdward Tomasz Napierala const char *namebuf; 2072bfc50bcSEdward Tomasz Napierala }; 2082bfc50bcSEdward Tomasz Napierala #endif 2092bfc50bcSEdward Tomasz Napierala /* ARGSUSED */ 2102bfc50bcSEdward Tomasz Napierala int 2118451d0ddSKip Macy sys_setloginclass(struct thread *td, struct setloginclass_args *uap) 2122bfc50bcSEdward Tomasz Napierala { 2132bfc50bcSEdward Tomasz Napierala struct proc *p = td->td_proc; 2142bfc50bcSEdward Tomasz Napierala int error; 2152bfc50bcSEdward Tomasz Napierala char lcname[MAXLOGNAME]; 2162bfc50bcSEdward Tomasz Napierala struct loginclass *newlc; 2172bfc50bcSEdward Tomasz Napierala struct ucred *newcred, *oldcred; 2182bfc50bcSEdward Tomasz Napierala 2192bfc50bcSEdward Tomasz Napierala error = priv_check(td, PRIV_PROC_SETLOGINCLASS); 2202bfc50bcSEdward Tomasz Napierala if (error != 0) 2212bfc50bcSEdward Tomasz Napierala return (error); 2222bfc50bcSEdward Tomasz Napierala error = copyinstr(uap->namebuf, lcname, sizeof(lcname), NULL); 2232bfc50bcSEdward Tomasz Napierala if (error != 0) 2242bfc50bcSEdward Tomasz Napierala return (error); 2252bfc50bcSEdward Tomasz Napierala 2262bfc50bcSEdward Tomasz Napierala newlc = loginclass_find(lcname); 2272bfc50bcSEdward Tomasz Napierala if (newlc == NULL) 2282bfc50bcSEdward Tomasz Napierala return (EINVAL); 2292bfc50bcSEdward Tomasz Napierala newcred = crget(); 2302bfc50bcSEdward Tomasz Napierala 2312bfc50bcSEdward Tomasz Napierala PROC_LOCK(p); 2322bfc50bcSEdward Tomasz Napierala oldcred = crcopysafe(p, newcred); 2332bfc50bcSEdward Tomasz Napierala newcred->cr_loginclass = newlc; 2342bfc50bcSEdward Tomasz Napierala p->p_ucred = newcred; 2352bfc50bcSEdward Tomasz Napierala PROC_UNLOCK(p); 236097055e2SEdward Tomasz Napierala #ifdef RACCT 237097055e2SEdward Tomasz Napierala racct_proc_ucred_changed(p, oldcred, newcred); 238097055e2SEdward Tomasz Napierala #endif 2392bfc50bcSEdward Tomasz Napierala loginclass_free(oldcred->cr_loginclass); 2402bfc50bcSEdward Tomasz Napierala crfree(oldcred); 2412bfc50bcSEdward Tomasz Napierala 2422bfc50bcSEdward Tomasz Napierala return (0); 2432bfc50bcSEdward Tomasz Napierala } 2442bfc50bcSEdward Tomasz Napierala 245097055e2SEdward Tomasz Napierala void 246097055e2SEdward Tomasz Napierala loginclass_racct_foreach(void (*callback)(struct racct *racct, 247097055e2SEdward Tomasz Napierala void *arg2, void *arg3), void *arg2, void *arg3) 248097055e2SEdward Tomasz Napierala { 249097055e2SEdward Tomasz Napierala struct loginclass *lc; 250097055e2SEdward Tomasz Napierala 251*b720dc97SMateusz Guzik rw_rlock(&loginclasses_lock); 252097055e2SEdward Tomasz Napierala LIST_FOREACH(lc, &loginclasses, lc_next) 253097055e2SEdward Tomasz Napierala (callback)(lc->lc_racct, arg2, arg3); 254*b720dc97SMateusz Guzik rw_runlock(&loginclasses_lock); 255097055e2SEdward Tomasz Napierala } 256