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login_cap.c revision 1.27 
      1 /*	$NetBSD: login_cap.c,v 1.27 2007/02/04 08:19:26 elad Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1995,1997 Berkeley Software Design, Inc. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by Berkeley Software Design,
     17  *	Inc.
     18  * 4. The name of Berkeley Software Design, Inc.  may not be used to endorse
     19  *    or promote products derived from this software without specific prior
     20  *    written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN, INC. ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN, INC. BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	BSDI login_cap.c,v 2.13 1998/02/07 03:17:05 prb Exp
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #if defined(LIBC_SCCS) && !defined(lint)
     39 __RCSID("$NetBSD: login_cap.c,v 1.27 2007/02/04 08:19:26 elad Exp $");
     40 #endif /* LIBC_SCCS and not lint */
     41 
     42 #include <sys/types.h>
     43 #include <sys/stat.h>
     44 #include <sys/time.h>
     45 #include <sys/resource.h>
     46 #include <sys/param.h>
     47 
     48 #include <assert.h>
     49 #include <ctype.h>
     50 #include <err.h>
     51 #include <errno.h>
     52 #include <fcntl.h>
     53 #include <limits.h>
     54 #include <login_cap.h>
     55 #include <paths.h>
     56 #include <pwd.h>
     57 #include <stdio.h>
     58 #include <stdlib.h>
     59 #include <string.h>
     60 #include <syslog.h>
     61 #include <unistd.h>
     62 #include <util.h>
     63 
     64 static u_quad_t	multiply(u_quad_t, u_quad_t);
     65 static u_quad_t	strtolimit(const char *, char **, int);
     66 static u_quad_t	strtosize(const char *, char **, int);
     67 static int	gsetrl(login_cap_t *, int, const char *, int type);
     68 static int	isinfinite(const char *);
     69 static int	envset(void *, const char *, const char *, int);
     70 
     71 login_cap_t *
     72 login_getclass(const char *class)
     73 {
     74 	const char *classfiles[2];
     75 	login_cap_t *lc;
     76 	int res;
     77 
     78 	/* class may be NULL */
     79 
     80 	if (secure_path(_PATH_LOGIN_CONF) == 0) {
     81 		classfiles[0] = _PATH_LOGIN_CONF;
     82 		classfiles[1] = NULL;
     83 	} else {
     84 		classfiles[0] = NULL;
     85 	}
     86 
     87 	if ((lc = malloc(sizeof(login_cap_t))) == NULL) {
     88 		syslog(LOG_ERR, "%s:%d malloc: %m", __FILE__, __LINE__);
     89 		return (0);
     90 	}
     91 
     92 	lc->lc_cap = 0;
     93 	lc->lc_style = 0;
     94 
     95 	if (class == NULL || class[0] == '\0')
     96 		class = LOGIN_DEFCLASS;
     97 
     98     	if ((lc->lc_class = strdup(class)) == NULL) {
     99 		syslog(LOG_ERR, "%s:%d strdup: %m", __FILE__, __LINE__);
    100 		free(lc);
    101 		return (0);
    102 	}
    103 
    104 	/*
    105 	 * Not having a login.conf file is not an error condition.
    106 	 * The individual routines deal reasonably with missing
    107 	 * capabilities and use default values.
    108 	 */
    109 	if (classfiles[0] == NULL)
    110 		return(lc);
    111 
    112 	if ((res = cgetent(&lc->lc_cap, classfiles, lc->lc_class)) != 0) {
    113 		lc->lc_cap = 0;
    114 		switch (res) {
    115 		case 1:
    116 			syslog(LOG_ERR, "%s: couldn't resolve 'tc'",
    117 				lc->lc_class);
    118 			break;
    119 		case -1:
    120 			if (strcmp(lc->lc_class, LOGIN_DEFCLASS) == 0)
    121 				return (lc);
    122 			syslog(LOG_ERR, "%s: unknown class", lc->lc_class);
    123 			break;
    124 		case -2:
    125 			syslog(LOG_ERR, "%s: getting class information: %m",
    126 				lc->lc_class);
    127 			break;
    128 		case -3:
    129 			syslog(LOG_ERR, "%s: 'tc' reference loop",
    130 				lc->lc_class);
    131 			break;
    132 		default:
    133 			syslog(LOG_ERR, "%s: unexpected cgetent error",
    134 				lc->lc_class);
    135 			break;
    136 		}
    137 		free(lc->lc_class);
    138 		free(lc);
    139 		return (0);
    140 	}
    141 	return (lc);
    142 }
    143 
    144 login_cap_t *
    145 login_getpwclass(const struct passwd *pwd)
    146 {
    147 
    148 	/* pwd may be NULL */
    149 
    150 	return login_getclass(pwd ? pwd->pw_class : NULL);
    151 }
    152 
    153 char *
    154 login_getcapstr(login_cap_t *lc, const char *cap, char *def, char *e)
    155 {
    156 	char *res = NULL;
    157 	int status;
    158 
    159 	errno = 0;
    160 
    161 	_DIAGASSERT(cap != NULL);
    162 
    163 	if (!lc || !lc->lc_cap)
    164 		return (def);
    165 
    166 	switch (status = cgetstr(lc->lc_cap, cap, &res)) {
    167 	case -1:
    168 		if (res)
    169 			free(res);
    170 		return (def);
    171 	case -2:
    172 		syslog(LOG_ERR, "%s: getting capability %s: %m",
    173 		    lc->lc_class, cap);
    174 		if (res)
    175 			free(res);
    176 		return (e);
    177 	default:
    178 		if (status >= 0)
    179 			return (res);
    180 		syslog(LOG_ERR, "%s: unexpected error with capability %s",
    181 		    lc->lc_class, cap);
    182 		if (res)
    183 			free(res);
    184 		return (e);
    185 	}
    186 }
    187 
    188 quad_t
    189 login_getcaptime(login_cap_t *lc, const char *cap, quad_t def, quad_t e)
    190 {
    191 	char *ep;
    192 	char *res = NULL, *sres;
    193 	int status;
    194 	quad_t q, r;
    195 
    196 	_DIAGASSERT(cap != NULL);
    197 
    198 	errno = 0;
    199 	if (!lc || !lc->lc_cap)
    200 		return (def);
    201 
    202 	switch (status = cgetstr(lc->lc_cap, cap, &res)) {
    203 	case -1:
    204 		if (res)
    205 			free(res);
    206 		return (def);
    207 	case -2:
    208 		syslog(LOG_ERR, "%s: getting capability %s: %m",
    209 		    lc->lc_class, cap);
    210 		errno = ERANGE;
    211 		if (res)
    212 			free(res);
    213 		return (e);
    214 	default:
    215 		if (status >= 0)
    216 			break;
    217 		syslog(LOG_ERR, "%s: unexpected error with capability %s",
    218 		    lc->lc_class, cap);
    219 		errno = ERANGE;
    220 		if (res)
    221 			free(res);
    222 		return (e);
    223 	}
    224 
    225 	if (isinfinite(res))
    226 		return (RLIM_INFINITY);
    227 
    228 	errno = 0;
    229 
    230 	q = 0;
    231 	sres = res;
    232 	while (*res) {
    233 		r = strtoq(res, &ep, 0);
    234 		if (!ep || ep == res ||
    235 		    ((r == QUAD_MIN || r == QUAD_MAX) && errno == ERANGE)) {
    236 invalid:
    237 			syslog(LOG_ERR, "%s:%s=%s: invalid time",
    238 			    lc->lc_class, cap, sres);
    239 			errno = ERANGE;
    240 			free(sres);
    241 			return (e);
    242 		}
    243 		switch (*ep++) {
    244 		case '\0':
    245 			--ep;
    246 			break;
    247 		case 's': case 'S':
    248 			break;
    249 		case 'm': case 'M':
    250 			r *= 60;
    251 			break;
    252 		case 'h': case 'H':
    253 			r *= 60 * 60;
    254 			break;
    255 		case 'd': case 'D':
    256 			r *= 60 * 60 * 24;
    257 			break;
    258 		case 'w': case 'W':
    259 			r *= 60 * 60 * 24 * 7;
    260 			break;
    261 		case 'y': case 'Y':	/* Pretty absurd */
    262 			r *= 60 * 60 * 24 * 365;
    263 			break;
    264 		default:
    265 			goto invalid;
    266 		}
    267 		res = ep;
    268 		q += r;
    269 	}
    270 	free(sres);
    271 	return (q);
    272 }
    273 
    274 quad_t
    275 login_getcapnum(login_cap_t *lc, const char *cap, quad_t def, quad_t e)
    276 {
    277 	char *ep;
    278 	char *res = NULL;
    279 	int status;
    280 	quad_t q;
    281 
    282 	_DIAGASSERT(cap != NULL);
    283 
    284 	errno = 0;
    285 	if (!lc || !lc->lc_cap)
    286 		return (def);
    287 
    288 	switch (status = cgetstr(lc->lc_cap, cap, &res)) {
    289 	case -1:
    290 		if (res)
    291 			free(res);
    292 		return (def);
    293 	case -2:
    294 		syslog(LOG_ERR, "%s: getting capability %s: %m",
    295 		    lc->lc_class, cap);
    296 		errno = ERANGE;
    297 		if (res)
    298 			free(res);
    299 		return (e);
    300 	default:
    301 		if (status >= 0)
    302 			break;
    303 		syslog(LOG_ERR, "%s: unexpected error with capability %s",
    304 		    lc->lc_class, cap);
    305 		errno = ERANGE;
    306 		if (res)
    307 			free(res);
    308 		return (e);
    309 	}
    310 
    311 	if (isinfinite(res))
    312 		return (RLIM_INFINITY);
    313 
    314 	errno = 0;
    315     	q = strtoq(res, &ep, 0);
    316 	if (!ep || ep == res || ep[0] ||
    317 	    ((q == QUAD_MIN || q == QUAD_MAX) && errno == ERANGE)) {
    318 		syslog(LOG_ERR, "%s:%s=%s: invalid number",
    319 		    lc->lc_class, cap, res);
    320 		errno = ERANGE;
    321 		free(res);
    322 		return (e);
    323 	}
    324 	free(res);
    325 	return (q);
    326 }
    327 
    328 quad_t
    329 login_getcapsize(login_cap_t *lc, const char *cap, quad_t def, quad_t e)
    330 {
    331 	char *ep;
    332 	char *res = NULL;
    333 	int status;
    334 	quad_t q;
    335 
    336 	_DIAGASSERT(cap != NULL);
    337 
    338 	errno = 0;
    339 
    340 	if (!lc || !lc->lc_cap)
    341 		return (def);
    342 
    343 	switch (status = cgetstr(lc->lc_cap, cap, &res)) {
    344 	case -1:
    345 		if (res)
    346 			free(res);
    347 		return (def);
    348 	case -2:
    349 		syslog(LOG_ERR, "%s: getting capability %s: %m",
    350 		    lc->lc_class, cap);
    351 		errno = ERANGE;
    352 		if (res)
    353 			free(res);
    354 		return (e);
    355 	default:
    356 		if (status >= 0)
    357 			break;
    358 		syslog(LOG_ERR, "%s: unexpected error with capability %s",
    359 		    lc->lc_class, cap);
    360 		errno = ERANGE;
    361 		if (res)
    362 			free(res);
    363 		return (e);
    364 	}
    365 
    366 	errno = 0;
    367 	q = strtolimit(res, &ep, 0);
    368 	if (!ep || ep == res || (ep[0] && ep[1]) ||
    369 	    ((q == QUAD_MIN || q == QUAD_MAX) && errno == ERANGE)) {
    370 		syslog(LOG_ERR, "%s:%s=%s: invalid size",
    371 		    lc->lc_class, cap, res);
    372 		errno = ERANGE;
    373 		free(res);
    374 		return (e);
    375 	}
    376 	free(res);
    377 	return (q);
    378 }
    379 
    380 int
    381 login_getcapbool(login_cap_t *lc, const char *cap, u_int def)
    382 {
    383 
    384 	_DIAGASSERT(cap != NULL);
    385 
    386 	if (!lc || !lc->lc_cap)
    387 		return (def);
    388 
    389 	return (cgetcap(lc->lc_cap, cap, ':') != NULL);
    390 }
    391 
    392 void
    393 login_close(login_cap_t *lc)
    394 {
    395 
    396 	if (lc) {
    397 		if (lc->lc_class)
    398 			free(lc->lc_class);
    399 		if (lc->lc_cap)
    400 			free(lc->lc_cap);
    401 		if (lc->lc_style)
    402 			free(lc->lc_style);
    403 		free(lc);
    404 	}
    405 }
    406 
    407 #define	R_CTIME	1
    408 #define	R_CSIZE	2
    409 #define	R_CNUMB	3
    410 
    411 static struct {
    412 	int	what;
    413 	int	type;
    414 	const char *name;
    415 } r_list[] = {
    416 	{ RLIMIT_CPU,		R_CTIME, "cputime", },
    417 	{ RLIMIT_FSIZE,		R_CSIZE, "filesize", },
    418 	{ RLIMIT_DATA,		R_CSIZE, "datasize", },
    419 	{ RLIMIT_STACK,		R_CSIZE, "stacksize", },
    420 	{ RLIMIT_RSS,		R_CSIZE, "memoryuse", },
    421 	{ RLIMIT_MEMLOCK,	R_CSIZE, "memorylocked", },
    422 	{ RLIMIT_NPROC,		R_CNUMB, "maxproc", },
    423 	{ RLIMIT_NOFILE,	R_CNUMB, "openfiles", },
    424 	{ RLIMIT_CORE,		R_CSIZE, "coredumpsize", },
    425 	{ RLIMIT_SBSIZE,	R_CSIZE, "sbsize", },
    426 	{ -1, 0, 0 }
    427 };
    428 
    429 static int
    430 gsetrl(login_cap_t *lc, int what, const char *name, int type)
    431 {
    432 	struct rlimit rl;
    433 	struct rlimit r;
    434 	char name_cur[32];
    435 	char name_max[32];
    436 
    437 	_DIAGASSERT(name != NULL);
    438 
    439 	(void)snprintf(name_cur, sizeof(name_cur), "%s-cur", name);
    440 	(void)snprintf(name_max, sizeof(name_max), "%s-max", name);
    441 
    442 	if (getrlimit(what, &r)) {
    443 		syslog(LOG_ERR, "getting resource limit: %m");
    444 		return (-1);
    445 	}
    446 
    447 #define	RCUR	r.rlim_cur
    448 #define	RMAX	r.rlim_max
    449 
    450 	switch (type) {
    451 	case R_CTIME:
    452 		RCUR = login_getcaptime(lc, name, RCUR, RCUR);
    453 		RMAX = login_getcaptime(lc, name, RMAX, RMAX);
    454 		rl.rlim_cur = login_getcaptime(lc, name_cur, RCUR, RCUR);
    455 		rl.rlim_max = login_getcaptime(lc, name_max, RMAX, RMAX);
    456 		break;
    457 	case R_CSIZE:
    458 		RCUR = login_getcapsize(lc, name, RCUR, RCUR);
    459 		RMAX = login_getcapsize(lc, name, RMAX, RMAX);
    460 		rl.rlim_cur = login_getcapsize(lc, name_cur, RCUR, RCUR);
    461 		rl.rlim_max = login_getcapsize(lc, name_max, RMAX, RMAX);
    462 		break;
    463 	case R_CNUMB:
    464 		RCUR = login_getcapnum(lc, name, RCUR, RCUR);
    465 		RMAX = login_getcapnum(lc, name, RMAX, RMAX);
    466 		rl.rlim_cur = login_getcapnum(lc, name_cur, RCUR, RCUR);
    467 		rl.rlim_max = login_getcapnum(lc, name_max, RMAX, RMAX);
    468 		break;
    469 	default:
    470 		syslog(LOG_ERR, "%s: invalid type %d setting resource limit %s",
    471 		    lc->lc_class, type, name);
    472 		return (-1);
    473 	}
    474 
    475 	if (setrlimit(what, &rl)) {
    476 		syslog(LOG_ERR, "%s: setting resource limit %s: %m",
    477 		    lc->lc_class, name);
    478 		return (-1);
    479 	}
    480 #undef	RCUR
    481 #undef	RMAX
    482 	return (0);
    483 }
    484 
    485 static int
    486 /*ARGSUSED*/
    487 envset(void *envp __unused, const char *name, const char *value, int overwrite)
    488 {
    489 	return setenv(name, value, overwrite);
    490 }
    491 
    492 int
    493 setuserenv(login_cap_t *lc, envfunc_t senv, void *envp)
    494 {
    495 	const char *stop = ", \t";
    496 	size_t i, count;
    497 	char *ptr;
    498 	char **res;
    499 	char *str = login_getcapstr(lc, "setenv", NULL, NULL);
    500 
    501 	if (str == NULL || *str == '\0')
    502 		return 0;
    503 
    504 	/*
    505 	 * count the sub-strings, this may over-count since we don't
    506 	 * account for escaped delimiters.
    507 	 */
    508 	for (i = 1, ptr = str; *ptr; i++) {
    509 		ptr += strcspn(ptr, stop);
    510 		if (*ptr)
    511 			ptr++;
    512 	}
    513 
    514 	/* allocate ptr array and string */
    515 	count = i;
    516 	res = malloc(count * sizeof(char *) + strlen(str) + 1);
    517 
    518 	if (!res)
    519 		return -1;
    520 
    521 	ptr = (char *)(void *)&res[count];
    522 	(void)strcpy(ptr, str);
    523 
    524 	/* split string */
    525 	for (i = 0; (res[i] = stresep(&ptr, stop, '\\')) != NULL; )
    526 		if (*res[i])
    527 			i++;
    528 
    529 	count = i;
    530 
    531 	for (i = 0; i < count; i++) {
    532 		if ((ptr = strchr(res[i], '=')) != NULL)
    533 			*ptr++ = '\0';
    534 		else
    535 			ptr = NULL;
    536 		(void)(*senv)(envp, res[i], ptr ? ptr : "", 1);
    537 	}
    538 
    539 	free(res);
    540 	return 0;
    541 }
    542 
    543 int
    544 setclasscontext(const char *class, u_int flags)
    545 {
    546 	int ret;
    547 	login_cap_t *lc;
    548 
    549 	flags &= LOGIN_SETRESOURCES | LOGIN_SETPRIORITY | LOGIN_SETUMASK |
    550 	    LOGIN_SETPATH;
    551 
    552 	lc = login_getclass(class);
    553 	ret = lc ? setusercontext(lc, NULL, 0, flags) : -1;
    554 	login_close(lc);
    555 	return (ret);
    556 }
    557 
    558 int
    559 setusercontext(login_cap_t *lc, struct passwd *pwd, uid_t uid, u_int flags)
    560 {
    561 	char per_user_tmp[MAXPATHLEN + 1];
    562 	login_cap_t *flc;
    563 	quad_t p;
    564 	int i;
    565 
    566 	flc = NULL;
    567 
    568 	if (!lc)
    569 		flc = lc = login_getclass(pwd ? pwd->pw_class : NULL);
    570 
    571 	/*
    572 	 * Without the pwd entry being passed we cannot set either
    573 	 * the group or the login.  We could complain about it.
    574 	 */
    575 	if (pwd == NULL)
    576 		flags &= ~(LOGIN_SETGROUP|LOGIN_SETLOGIN);
    577 
    578 	if (flags & LOGIN_SETRESOURCES)
    579 		for (i = 0; r_list[i].name; ++i)
    580 			(void)gsetrl(lc, r_list[i].what, r_list[i].name,
    581 			    r_list[i].type);
    582 
    583 	if (flags & LOGIN_SETPRIORITY) {
    584 		p = login_getcapnum(lc, "priority", (quad_t)0, (quad_t)0);
    585 
    586 		if (setpriority(PRIO_PROCESS, 0, (int)p) < 0)
    587 			syslog(LOG_ERR, "%s: setpriority: %m", lc->lc_class);
    588 	}
    589 
    590 	if (flags & LOGIN_SETUMASK) {
    591 		p = login_getcapnum(lc, "umask", (quad_t) LOGIN_DEFUMASK,
    592 												   (quad_t) LOGIN_DEFUMASK);
    593 		umask((mode_t)p);
    594 	}
    595 
    596 	if (flags & LOGIN_SETGROUP) {
    597 		if (setgid(pwd->pw_gid) < 0) {
    598 			syslog(LOG_ERR, "setgid(%d): %m", pwd->pw_gid);
    599 			login_close(flc);
    600 			return (-1);
    601 		}
    602 
    603 		if (initgroups(pwd->pw_name, pwd->pw_gid) < 0) {
    604 			syslog(LOG_ERR, "initgroups(%s,%d): %m",
    605 			    pwd->pw_name, pwd->pw_gid);
    606 			login_close(flc);
    607 			return (-1);
    608 		}
    609 	}
    610 
    611 	/* Create per-user temporary directories if needed. */
    612 	if (readlink("/tmp", per_user_tmp, sizeof(per_user_tmp)) != -1) {
    613 		static const char atuid[] = "/@uid";
    614 		char *lp;
    615 
    616 		/* Check if it's magic symlink. */
    617 		lp = strstr(per_user_tmp, atuid);
    618 		if (lp != NULL && *(lp + (sizeof(atuid) - 1)) == '\0') {
    619 			lp++;
    620 
    621 			if ((sizeof(per_user_tmp) - (lp - per_user_tmp)) < 64) {
    622 				syslog(LOG_ERR, "real temporary path too long");
    623 				login_close(flc);
    624 				return (-1);
    625 			}
    626 			(void)sprintf(lp, "/%u", pwd->pw_uid); /* safe */
    627 			if (mkdir(per_user_tmp, S_IRWXU) != -1) {
    628 				(void)chown(per_user_tmp, pwd->pw_uid,
    629 				    pwd->pw_gid);
    630 			} else {
    631 				syslog(LOG_ERR, "can't create `%s' directory",
    632 				    per_user_tmp);
    633 			}
    634 		}
    635 	}
    636 	errno = 0;
    637 
    638 	if (flags & LOGIN_SETLOGIN)
    639 		if (setlogin(pwd->pw_name) < 0) {
    640 			syslog(LOG_ERR, "setlogin(%s) failure: %m",
    641 			    pwd->pw_name);
    642 			login_close(flc);
    643 			return (-1);
    644 		}
    645 
    646 	if (flags & LOGIN_SETUSER)
    647 		if (setuid(uid) < 0) {
    648 			syslog(LOG_ERR, "setuid(%d): %m", uid);
    649 			login_close(flc);
    650 			return (-1);
    651 		}
    652 
    653 	if (flags & LOGIN_SETENV)
    654 		setuserenv(lc, envset, NULL);
    655 
    656 	if (flags & LOGIN_SETPATH)
    657 		setuserpath(lc, pwd ? pwd->pw_dir : "", envset, NULL);
    658 
    659 	login_close(flc);
    660 	return (0);
    661 }
    662 
    663 void
    664 setuserpath(login_cap_t *lc, const char *home, envfunc_t senv, void *envp)
    665 {
    666 	size_t hlen, plen;
    667 	int cnt = 0;
    668 	char *path;
    669 	const char *cpath;
    670 	char *p, *q;
    671 
    672 	_DIAGASSERT(home != NULL);
    673 
    674 	hlen = strlen(home);
    675 
    676 	p = path = login_getcapstr(lc, "path", NULL, NULL);
    677 	if (p) {
    678 		while (*p)
    679 			if (*p++ == '~')
    680 				++cnt;
    681 		plen = (p - path) + cnt * (hlen + 1) + 1;
    682 		p = path;
    683 		q = path = malloc(plen);
    684 		if (q) {
    685 			while (*p) {
    686 				p += strspn(p, " \t");
    687 				if (*p == '\0')
    688 					break;
    689 				plen = strcspn(p, " \t");
    690 				if (hlen == 0 && *p == '~') {
    691 					p += plen;
    692 					continue;
    693 				}
    694 				if (q != path)
    695 					*q++ = ':';
    696 				if (*p == '~') {
    697 					strcpy(q, home);
    698 					q += hlen;
    699 					++p;
    700 					--plen;
    701 				}
    702 				memcpy(q, p, plen);
    703 				p += plen;
    704 				q += plen;
    705 			}
    706 			*q = '\0';
    707 			cpath = path;
    708 		} else
    709 			cpath = _PATH_DEFPATH;
    710 	} else
    711 		cpath = _PATH_DEFPATH;
    712 	if ((*senv)(envp, "PATH", cpath, 1))
    713 		warn("could not set PATH");
    714 }
    715 
    716 /*
    717  * Convert an expression of the following forms
    718  * 	1) A number.
    719  *	2) A number followed by a b (mult by 512).
    720  *	3) A number followed by a k (mult by 1024).
    721  *	5) A number followed by a m (mult by 1024 * 1024).
    722  *	6) A number followed by a g (mult by 1024 * 1024 * 1024).
    723  *	7) A number followed by a t (mult by 1024 * 1024 * 1024 * 1024).
    724  *	8) Two or more numbers (with/without k,b,m,g, or t).
    725  *	   separated by x (also * for backwards compatibility), specifying
    726  *	   the product of the indicated values.
    727  */
    728 static u_quad_t
    729 strtosize(const char *str, char **endptr, int radix)
    730 {
    731 	u_quad_t num, num2;
    732 	char *expr, *expr2;
    733 
    734 	_DIAGASSERT(str != NULL);
    735 	/* endptr may be NULL */
    736 
    737 	errno = 0;
    738 	num = strtouq(str, &expr, radix);
    739 	if (errno || expr == str) {
    740 		if (endptr)
    741 			*endptr = expr;
    742 		return (num);
    743 	}
    744 
    745 	switch(*expr) {
    746 	case 'b': case 'B':
    747 		num = multiply(num, (u_quad_t)512);
    748 		++expr;
    749 		break;
    750 	case 'k': case 'K':
    751 		num = multiply(num, (u_quad_t)1024);
    752 		++expr;
    753 		break;
    754 	case 'm': case 'M':
    755 		num = multiply(num, (u_quad_t)1024 * 1024);
    756 		++expr;
    757 		break;
    758 	case 'g': case 'G':
    759 		num = multiply(num, (u_quad_t)1024 * 1024 * 1024);
    760 		++expr;
    761 		break;
    762 	case 't': case 'T':
    763 		num = multiply(num, (u_quad_t)1024 * 1024);
    764 		num = multiply(num, (u_quad_t)1024 * 1024);
    765 		++expr;
    766 		break;
    767 	}
    768 
    769 	if (errno)
    770 		goto erange;
    771 
    772 	switch(*expr) {
    773 	case '*':			/* Backward compatible. */
    774 	case 'x':
    775 		num2 = strtosize(expr+1, &expr2, radix);
    776 		if (errno) {
    777 			expr = expr2;
    778 			goto erange;
    779 		}
    780 
    781 		if (expr2 == expr + 1) {
    782 			if (endptr)
    783 				*endptr = expr;
    784 			return (num);
    785 		}
    786 		expr = expr2;
    787 		num = multiply(num, num2);
    788 		if (errno)
    789 			goto erange;
    790 		break;
    791 	}
    792 	if (endptr)
    793 		*endptr = expr;
    794 	return (num);
    795 erange:
    796 	if (endptr)
    797 		*endptr = expr;
    798 	errno = ERANGE;
    799 	return (UQUAD_MAX);
    800 }
    801 
    802 static u_quad_t
    803 strtolimit(const char *str, char **endptr, int radix)
    804 {
    805 
    806 	_DIAGASSERT(str != NULL);
    807 	/* endptr may be NULL */
    808 
    809 	if (isinfinite(str)) {
    810 		if (endptr)
    811 			*endptr = (char *)__UNCONST(str) + strlen(str);
    812 		return ((u_quad_t)RLIM_INFINITY);
    813 	}
    814 	return (strtosize(str, endptr, radix));
    815 }
    816 
    817 static int
    818 isinfinite(const char *s)
    819 {
    820 	static const char *infs[] = {
    821 		"infinity",
    822 		"inf",
    823 		"unlimited",
    824 		"unlimit",
    825 		NULL
    826 	};
    827 	const char **i;
    828 
    829 	_DIAGASSERT(s != NULL);
    830 
    831 	for (i = infs; *i; i++) {
    832 		if (!strcasecmp(s, *i))
    833 			return 1;
    834 	}
    835 	return 0;
    836 }
    837 
    838 static u_quad_t
    839 multiply(u_quad_t n1, u_quad_t n2)
    840 {
    841 	static int bpw = 0;
    842 	u_quad_t m;
    843 	u_quad_t r;
    844 	int b1, b2;
    845 
    846 	/*
    847 	 * Get rid of the simple cases
    848 	 */
    849 	if (n1 == 0 || n2 == 0)
    850 		return (0);
    851 	if (n1 == 1)
    852 		return (n2);
    853 	if (n2 == 1)
    854 		return (n1);
    855 
    856 	/*
    857 	 * sizeof() returns number of bytes needed for storage.
    858 	 * This may be different from the actual number of useful bits.
    859 	 */
    860 	if (!bpw) {
    861 		bpw = sizeof(u_quad_t) * 8;
    862 		while (((u_quad_t)1 << (bpw-1)) == 0)
    863 			--bpw;
    864 	}
    865 
    866 	/*
    867 	 * First check the magnitude of each number.  If the sum of the
    868 	 * magnatude is way to high, reject the number.  (If this test
    869 	 * is not done then the first multiply below may overflow.)
    870 	 */
    871 	for (b1 = bpw; (((u_quad_t)1 << (b1-1)) & n1) == 0; --b1)
    872 		;
    873 	for (b2 = bpw; (((u_quad_t)1 << (b2-1)) & n2) == 0; --b2)
    874 		;
    875 	if (b1 + b2 - 2 > bpw) {
    876 		errno = ERANGE;
    877 		return (UQUAD_MAX);
    878 	}
    879 
    880 	/*
    881 	 * Decompose the multiplication to be:
    882 	 * h1 = n1 & ~1
    883 	 * h2 = n2 & ~1
    884 	 * l1 = n1 & 1
    885 	 * l2 = n2 & 1
    886 	 * (h1 + l1) * (h2 + l2)
    887 	 * (h1 * h2) + (h1 * l2) + (l1 * h2) + (l1 * l2)
    888 	 *
    889 	 * Since h1 && h2 do not have the low bit set, we can then say:
    890 	 *
    891 	 * (h1>>1 * h2>>1 * 4) + ...
    892 	 *
    893 	 * So if (h1>>1 * h2>>1) > (1<<(bpw - 2)) then the result will
    894 	 * overflow.
    895 	 *
    896 	 * Finally, if MAX - ((h1 * l2) + (l1 * h2) + (l1 * l2)) < (h1*h2)
    897 	 * then adding in residual amout will cause an overflow.
    898 	 */
    899 
    900 	m = (n1 >> 1) * (n2 >> 1);
    901 
    902 	if (m >= ((u_quad_t)1 << (bpw-2))) {
    903 		errno = ERANGE;
    904 		return (UQUAD_MAX);
    905 	}
    906 
    907 	m *= 4;
    908 
    909 	r = (n1 & n2 & 1)
    910 	  + (n2 & 1) * (n1 & ~(u_quad_t)1)
    911 	  + (n1 & 1) * (n2 & ~(u_quad_t)1);
    912 
    913 	if ((u_quad_t)(m + r) < m) {
    914 		errno = ERANGE;
    915 		return (UQUAD_MAX);
    916 	}
    917 	m += r;
    918 
    919 	return (m);
    920 }
    921