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dmake: do not set MAKEFLAGS=k
[unleashed/tickless.git] / usr / src / cmd / sgs / rtld / common / paths.c
blob4816c9ee949f49b6dd4ecd5b0c37ff9bddf22e3d
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 /*
27 * Copyright (c) 1988 AT&T
28 * All Rights Reserved
29 */
30 /*
31 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
32 */
33
34 /*
35 * PATH setup and search directory functions.
36 */
37
38 #include <stdio.h>
39 #include <unistd.h>
40 #include <limits.h>
41 #include <fcntl.h>
42 #include <string.h>
43 #include <debug.h>
44 #include <conv.h>
45 #include "_rtld.h"
46 #include "msg.h"
47
48 /*
49 * Default and secure dependency search path initialization.
50 */
51 void
52 set_dirs(Alist **alpp, Spath_defn *sdp, uint_t flags)
53 {
54 while (sdp->sd_name) {
55 Pdesc *pdp;
56
57 if ((pdp = alist_append(alpp, NULL, sizeof (Pdesc),
58 AL_CNT_SPATH)) == NULL)
59 return;
60
61 pdp->pd_pname = (char *)sdp->sd_name;
62 pdp->pd_plen = sdp->sd_len;
63 pdp->pd_flags = flags;
64 sdp++;
65 }
66 }
67
68 static void
69 print_default_dirs(Lm_list *lml, Alist *alp, int search)
70 {
71 uint_t flags = 0;
72 int num = 0;
73 Aliste idx;
74 Pdesc *pdp;
75
76 if (search)
77 (void) printf(MSG_INTL(MSG_LDD_PTH_BGNDFL));
78
79 for (ALIST_TRAVERSE(alp, idx, pdp)) {
80 flags = pdp->pd_flags;
81
82 if (search) {
83 const char *fmt;
84
85 if (num++)
86 fmt = MSG_ORIG(MSG_LDD_FMT_PATHN);
87 else
88 fmt = MSG_ORIG(MSG_LDD_FMT_PATH1);
89
90 (void) printf(fmt, pdp->pd_pname);
91 } else
92 DBG_CALL(Dbg_libs_path(lml, pdp->pd_pname,
93 pdp->pd_flags, config->c_name));
94 }
95
96 if (search) {
97 if (flags & LA_SER_CONFIG)
98 (void) printf(MSG_INTL(MSG_LDD_PTH_ENDDFLC),
99 config->c_name);
100 else
101 (void) printf(MSG_INTL(MSG_LDD_PTH_ENDDFL));
102 }
103 }
104
105 /*
106 * Given a search rule type, return a list of directories to search according
107 * to the specified rule.
108 */
109 static Alist **
110 get_dir_list(uchar_t rules, Rt_map *lmp, uint_t flags)
111 {
112 Alist **dalpp = NULL;
113 Lm_list *lml = LIST(lmp);
114 int search;
115
116 /*
117 * Determine whether ldd -s is in effect - ignore when we're searching
118 * for audit libraries as these will be added to their own link-map.
119 */
120 if ((lml->lm_flags & LML_FLG_TRC_SEARCH) &&
121 ((FLAGS1(lmp) & FL1_RT_LDDSTUB) == 0) &&
122 ((flags & FLG_RT_AUDIT) == 0))
123 search = 1;
124 else
125 search = 0;
126
127 switch (rules) {
128 case RPLENV:
129 /*
130 * Initialize the replaceable environment variable
131 * (LD_LIBRARY_PATH) search path list. Note, we always call
132 * Dbg_libs_path() so that every library lookup diagnostic can
133 * be preceded with the appropriate search path information.
134 */
135 if (rpl_libpath) {
136 uint_t mode = (LA_SER_LIBPATH | PD_FLG_UNIQUE);
137
138 /*
139 * Note, this path may have originated from the users
140 * environment or from a configuration file.
141 */
142 if (env_info & ENV_INF_PATHCFG)
143 mode |= LA_SER_CONFIG;
144
145 DBG_CALL(Dbg_libs_path(lml, rpl_libpath, mode,
146 config->c_name));
147
148 /*
149 * For ldd(1) -s, indicate the search paths that'll
150 * be used. If this is a secure application then some
151 * search paths may be ignored, therefore reset the
152 * rpl_libdirs pointer each time so that the
153 * diagnostics related to these unsecure directories
154 * will be output for each image loaded.
155 */
156 if (search) {
157 const char *fmt;
158
159 if (env_info & ENV_INF_PATHCFG)
160 fmt = MSG_INTL(MSG_LDD_PTH_LIBPATHC);
161 else
162 fmt = MSG_INTL(MSG_LDD_PTH_LIBPATH);
163
164 (void) printf(fmt, rpl_libpath, config->c_name);
165 }
166 if (rpl_libdirs && (rtld_flags & RT_FL_SECURE) &&
167 (search || DBG_ENABLED))
168 remove_alist(&rpl_libdirs, 1);
169
170 if (rpl_libdirs == NULL) {
171 /*
172 * If this is a secure application we need to
173 * be selective over what directories we use.
174 */
175 (void) expand_paths(lmp, rpl_libpath,
176 &rpl_libdirs, AL_CNT_SEARCH, mode,
177 PD_TKN_CAP);
178 }
179 dalpp = &rpl_libdirs;
180 }
181 break;
182 case PRMENV:
183 /*
184 * Initialize the permanent (LD_LIBRARY_PATH) search path list.
185 * This can only originate from a configuration file. To be
186 * consistent with the debugging display of DEFENV (above),
187 * always call Dbg_libs_path().
188 */
189 if (prm_libpath) {
190 uint_t mode =
191 (LA_SER_LIBPATH | LA_SER_CONFIG | PD_FLG_UNIQUE);
192
193 DBG_CALL(Dbg_libs_path(lml, prm_libpath, mode,
194 config->c_name));
195
196 /*
197 * For ldd(1) -s, indicate the search paths that'll
198 * be used. If this is a secure application then some
199 * search paths may be ignored, therefore reset the
200 * prm_libdirs pointer each time so that the
201 * diagnostics related to these unsecure directories
202 * will be output for each image loaded.
203 */
204 if (search)
205 (void) printf(MSG_INTL(MSG_LDD_PTH_LIBPATHC),
206 prm_libpath, config->c_name);
207 if (prm_libdirs && (rtld_flags & RT_FL_SECURE) &&
208 (search || DBG_ENABLED))
209 remove_alist(&prm_libdirs, 1);
210
211 if (prm_libdirs == NULL) {
212 /*
213 * If this is a secure application we need to
214 * be selective over what directories we use.
215 */
216 (void) expand_paths(lmp, prm_libpath,
217 &prm_libdirs, AL_CNT_SEARCH, mode,
218 PD_TKN_CAP);
219 }
220 dalpp = &prm_libdirs;
221 }
222 break;
223 case RUNPATH:
224 /*
225 * Initialize the runpath search path list. To be consistent
226 * with the debugging display of DEFENV (above), always call
227 * Dbg_libs_path().
228 */
229 if (RPATH(lmp)) {
230 DBG_CALL(Dbg_libs_path(lml, RPATH(lmp), LA_SER_RUNPATH,
231 NAME(lmp)));
232
233 /*
234 * For ldd(1) -s, indicate the search paths that'll
235 * be used. If this is a secure application then some
236 * search paths may be ignored, therefore reset the
237 * runlist pointer each time so that the diagnostics
238 * related to these unsecure directories will be
239 * output for each image loaded.
240 */
241 if (search)
242 (void) printf(MSG_INTL(MSG_LDD_PTH_RUNPATH),
243 RPATH(lmp), NAME(lmp));
244 if (RLIST(lmp) && (rtld_flags & RT_FL_SECURE) &&
245 (search || DBG_ENABLED))
246 remove_alist(&RLIST(lmp), 1);
247
248 if (RLIST(lmp) == NULL) {
249 /*
250 * If this is a secure application we need to
251 * be selective over what directories we use.
252 */
253 (void) expand_paths(lmp, RPATH(lmp),
254 &RLIST(lmp), AL_CNT_SEARCH, LA_SER_RUNPATH,
255 PD_TKN_CAP);
256 }
257 dalpp = &RLIST(lmp);
258 }
259 break;
260 case DEFAULT:
261 /*
262 * If we have been requested to load an audit library through a
263 * DT_DEPAUDIT entry, then we treat this the same way that we
264 * handle a library that has been specified via a DT_NEEDED
265 * entry -- we check the default directories and not the
266 * secure directories.
267 */
268 if ((FLAGS1(lmp) & FL1_RT_NODEFLIB) == 0) {
269 if ((rtld_flags & RT_FL_SECURE) &&
270 ((flags & FLG_RT_PRELOAD) ||
271 ((flags & FLG_RT_AUDIT) && !(FLAGS1(lmp) &
272 FL1_RT_DEPAUD))))
273 dalpp = LM_SECURE_DIRS(lmp)();
274 else
275 dalpp = LM_DEFAULT_DIRS(lmp)();
276 }
277
278 /*
279 * For ldd(1) -s, indicate the default paths that'll be used.
280 */
281 if (dalpp && (search || DBG_ENABLED))
282 print_default_dirs(lml, *dalpp, search);
283 break;
284 default:
285 break;
286 }
287 return (dalpp);
288 }
289
290 /*
291 * Get the next directory in the search rules path. The search path "cookie"
292 * provided by the caller (sdp) maintains the state of a search in progress.
293 *
294 * Typically, a search consists of a series of rules that govern the order of
295 * a search (ie. LD_LIBRARY_PATH, followed by RPATHS, followed by defaults).
296 * Each rule can establish a corresponding series of path names, which are
297 * maintained as an Alist. The index within this Alist determines the present
298 * search directory.
299 */
300 Pdesc *
301 get_next_dir(Spath_desc *sdp, Rt_map *lmp, uint_t flags)
302 {
303 /*
304 * Make sure there are still rules to process.
305 */
306 while (*sdp->sp_rule) {
307 Alist *alp;
308
309 /*
310 * If an Alist for this rule already exists, use if, otherwise
311 * obtain an Alist for this rule. Providing the Alist has
312 * content, and the present Alist index is less than the number
313 * of Alist members, return the associated path name descriptor.
314 */
315 if ((sdp->sp_dalpp || ((sdp->sp_dalpp =
316 get_dir_list(*sdp->sp_rule, lmp, flags)) != NULL)) &&
317 ((alp = *sdp->sp_dalpp) != NULL) &&
318 (alist_nitems(alp) > sdp->sp_idx)) {
319 return (alist_item(alp, sdp->sp_idx++));
320 }
321
322 /*
323 * If no Alist for this rule exists, or if this is the last
324 * element of this Alist, reset the Alist pointer and index,
325 * and prepare for the next rule.
326 */
327 sdp->sp_rule++;
328 sdp->sp_dalpp = NULL;
329 sdp->sp_idx = 0;
330 }
331
332 /*
333 * All rules and search paths have been exhausted.
334 */
335 return (NULL);
336 }
337
338 /*
339 * Process a directory (runpath) or filename (needed or filter) string looking
340 * for tokens to expand. Allocate a new buffer for the string.
341 */
342 uint_t
343 expand(char **name, size_t *len, char **list, uint_t orig, uint_t omit,
344 Rt_map *lmp)
345 {
346 char _name[PATH_MAX];
347 char *token = NULL, *oname, *ename, *optr, *_optr, *nptr, *_list;
348 size_t olen = 0, nlen = 0, _len;
349 int isaflag = 0;
350 uint_t flags = 0;
351 Lm_list *lml = LIST(lmp);
352
353 optr = _optr = oname = ename = *name;
354 ename += *len;
355 nptr = _name;
356
357 while ((olen < *len) && (nlen < PATH_MAX)) {
358 uint_t _flags;
359
360 if ((*optr != '$') || ((olen - *len) == 1)) {
361 /*
362 * When expanding paths while a configuration file
363 * exists that contains directory information, determine
364 * whether the path contains "./". If so, we'll resolve
365 * the path later to remove these relative entries.
366 */
367 if ((rtld_flags & RT_FL_DIRCFG) &&
368 (orig & LA_SER_MASK) && (*optr == '/') &&
369 (optr != oname) && (*(optr - 1) == '.'))
370 flags |= TKN_DOTSLASH;
371
372 olen++, optr++;
373 continue;
374 }
375
376 /*
377 * Copy any string we've presently passed over to the new
378 * buffer.
379 */
380 if ((_len = (optr - _optr)) != 0) {
381 if ((nlen += _len) < PATH_MAX) {
382 (void) strncpy(nptr, _optr, _len);
383 nptr = nptr + _len;
384 } else {
385 eprintf(lml, ERR_FATAL,
386 MSG_INTL(MSG_ERR_EXPAND1), NAME(lmp),
387 oname);
388 return (0);
389 }
390 }
391
392 /*
393 * Skip the token delimiter and determine if a reserved token
394 * match is found.
395 */
396 olen++, optr++;
397 _flags = 0;
398 token = 0;
399
400 if (strncmp(optr, MSG_ORIG(MSG_TKN_ORIGIN),
401 MSG_TKN_ORIGIN_SIZE) == 0) {
402 token = (char *)MSG_ORIG(MSG_TKN_ORIGIN);
403
404 /*
405 * $ORIGIN expansion is required. Determine this
406 * objects basename. Expansion of $ORIGIN is allowed
407 * for secure applications but must be checked by the
408 * caller to insure the expanded path matches a
409 * registered secure name.
410 */
411 if (((omit & PD_TKN_ORIGIN) == 0) &&
412 (((_len = DIRSZ(lmp)) != 0) ||
413 ((_len = fullpath(lmp, 0)) != 0))) {
414 if ((nlen += _len) < PATH_MAX) {
415 (void) strncpy(nptr,
416 ORIGNAME(lmp), _len);
417 nptr = nptr +_len;
418 olen += MSG_TKN_ORIGIN_SIZE;
419 optr += MSG_TKN_ORIGIN_SIZE;
420 _flags |= PD_TKN_ORIGIN;
421 } else {
422 eprintf(lml, ERR_FATAL,
423 MSG_INTL(MSG_ERR_EXPAND1),
424 NAME(lmp), oname);
425 return (0);
426 }
427 }
428
429 } else if (strncmp(optr, MSG_ORIG(MSG_TKN_PLATFORM),
430 MSG_TKN_PLATFORM_SIZE) == 0) {
431 Syscapset *scapset;
432
433 if (FLAGS1(lmp) & FL1_RT_ALTCAP)
434 scapset = alt_scapset;
435 else
436 scapset = org_scapset;
437
438 token = (char *)MSG_ORIG(MSG_TKN_PLATFORM);
439
440 /*
441 * $PLATFORM expansion required.
442 */
443 if (((omit & PD_TKN_PLATFORM) == 0) &&
444 ((scapset->sc_plat == NULL) &&
445 (scapset->sc_platsz == 0)))
446 platform_name(scapset);
447
448 if (((omit & PD_TKN_PLATFORM) == 0) &&
449 scapset->sc_plat) {
450 nlen += scapset->sc_platsz;
451 if (nlen < PATH_MAX) {
452 (void) strncpy(nptr, scapset->sc_plat,
453 scapset->sc_platsz);
454 nptr = nptr + scapset->sc_platsz;
455 olen += MSG_TKN_PLATFORM_SIZE;
456 optr += MSG_TKN_PLATFORM_SIZE;
457 _flags |= PD_TKN_PLATFORM;
458 } else {
459 eprintf(lml, ERR_FATAL,
460 MSG_INTL(MSG_ERR_EXPAND1),
461 NAME(lmp), oname);
462 return (0);
463 }
464 }
465
466 } else if (strncmp(optr, MSG_ORIG(MSG_TKN_MACHINE),
467 MSG_TKN_MACHINE_SIZE) == 0) {
468 Syscapset *scapset;
469
470 if (FLAGS1(lmp) & FL1_RT_ALTCAP)
471 scapset = alt_scapset;
472 else
473 scapset = org_scapset;
474
475 token = (char *)MSG_ORIG(MSG_TKN_MACHINE);
476
477 /*
478 * $MACHINE expansion required.
479 */
480 if (((omit & PD_TKN_MACHINE) == 0) &&
481 ((scapset->sc_mach == NULL) &&
482 (scapset->sc_machsz == 0)))
483 machine_name(scapset);
484
485 if (((omit & PD_TKN_MACHINE) == 0) &&
486 scapset->sc_mach) {
487 nlen += scapset->sc_machsz;
488 if (nlen < PATH_MAX) {
489 (void) strncpy(nptr, scapset->sc_mach,
490 scapset->sc_machsz);
491 nptr = nptr + scapset->sc_machsz;
492 olen += MSG_TKN_MACHINE_SIZE;
493 optr += MSG_TKN_MACHINE_SIZE;
494 _flags |= PD_TKN_MACHINE;
495 } else {
496 eprintf(lml, ERR_FATAL,
497 MSG_INTL(MSG_ERR_EXPAND1),
498 NAME(lmp), oname);
499 return (0);
500 }
501 }
502
503 } else if (strncmp(optr, MSG_ORIG(MSG_TKN_OSNAME),
504 MSG_TKN_OSNAME_SIZE) == 0) {
505 token = (char *)MSG_ORIG(MSG_TKN_OSNAME);
506
507 /*
508 * $OSNAME expansion required. This is established
509 * from the sysname[] returned by uname(2).
510 */
511 if (((omit & PD_TKN_OSNAME) == 0) && (uts == NULL))
512 uts = conv_uts();
513
514 if (((omit & PD_TKN_OSNAME) == 0) &&
515 (uts && uts->uts_osnamesz)) {
516 if ((nlen += uts->uts_osnamesz) < PATH_MAX) {
517 (void) strncpy(nptr, uts->uts_osname,
518 uts->uts_osnamesz);
519 nptr = nptr + uts->uts_osnamesz;
520 olen += MSG_TKN_OSNAME_SIZE;
521 optr += MSG_TKN_OSNAME_SIZE;
522 _flags |= PD_TKN_OSNAME;
523 } else {
524 eprintf(lml, ERR_FATAL,
525 MSG_INTL(MSG_ERR_EXPAND1),
526 NAME(lmp), oname);
527 return (0);
528 }
529 }
530
531 } else if (strncmp(optr, MSG_ORIG(MSG_TKN_OSREL),
532 MSG_TKN_OSREL_SIZE) == 0) {
533 token = (char *)MSG_ORIG(MSG_TKN_OSREL);
534
535 /*
536 * $OSREL expansion required. This is established
537 * from the release[] returned by uname(2).
538 */
539 if (((omit & PD_TKN_OSREL) == 0) && (uts == 0))
540 uts = conv_uts();
541
542 if (((omit & PD_TKN_OSREL) == 0) &&
543 (uts && uts->uts_osrelsz)) {
544 if ((nlen += uts->uts_osrelsz) < PATH_MAX) {
545 (void) strncpy(nptr, uts->uts_osrel,
546 uts->uts_osrelsz);
547 nptr = nptr + uts->uts_osrelsz;
548 olen += MSG_TKN_OSREL_SIZE;
549 optr += MSG_TKN_OSREL_SIZE;
550 _flags |= PD_TKN_OSREL;
551 } else {
552 eprintf(lml, ERR_FATAL,
553 MSG_INTL(MSG_ERR_EXPAND1),
554 NAME(lmp), oname);
555 return (0);
556 }
557 }
558
559 } else if ((strncmp(optr, MSG_ORIG(MSG_TKN_ISALIST),
560 MSG_TKN_ISALIST_SIZE) == 0)) {
561 int ok;
562 token = (char *)MSG_ORIG(MSG_TKN_ISALIST);
563
564 /*
565 * $ISALIST expansion required. When accompanied with
566 * a list pointer, this routine updates that pointer
567 * with the new list of potential candidates. Without
568 * this list pointer, only the first expansion is
569 * provided. NOTE, that two $ISLIST expansions within
570 * the same path aren't supported.
571 */
572 if ((omit & PD_TKN_ISALIST) || isaflag++)
573 ok = 0;
574 else
575 ok = 1;
576
577 if (ok && (isa == NULL))
578 isa = conv_isalist();
579
580 if (ok && isa && isa->isa_listsz) {
581 size_t no, mlen, tlen, hlen = olen - 1;
582 char *lptr;
583 Isa_opt *opt = isa->isa_opt;
584
585 if ((nlen += opt->isa_namesz) < PATH_MAX) {
586 (void) strncpy(nptr, opt->isa_name,
587 opt->isa_namesz);
588 nptr = nptr + opt->isa_namesz;
589 olen += MSG_TKN_ISALIST_SIZE;
590 optr += MSG_TKN_ISALIST_SIZE;
591 _flags |= PD_TKN_ISALIST;
592 } else {
593 eprintf(lml, ERR_FATAL,
594 MSG_INTL(MSG_ERR_EXPAND1),
595 NAME(lmp), oname);
596 return (0);
597 }
598
599 if (list) {
600 tlen = *len - olen;
601 mlen = ((hlen + tlen) *
602 (isa->isa_optno - 1)) +
603 isa->isa_listsz - opt->isa_namesz +
604 strlen(*list);
605 if ((_list = lptr =
606 malloc(mlen)) == NULL)
607 return (0);
608
609 for (no = 1, opt++; no < isa->isa_optno;
610 no++, opt++) {
611 (void) strncpy(lptr, *name,
612 hlen);
613 lptr = lptr + hlen;
614 (void) strncpy(lptr,
615 opt->isa_name,
616 opt->isa_namesz);
617 lptr = lptr + opt->isa_namesz;
618 (void) strncpy(lptr, optr,
619 tlen);
620 lptr = lptr + tlen;
621 *lptr++ = ':';
622 }
623 if (**list)
624 (void) strcpy(lptr, *list);
625 else
626 *--lptr = '\0';
627 }
628 }
629
630 } else if (strncmp(optr, MSG_ORIG(MSG_TKN_CAPABILITY),
631 MSG_TKN_CAPABILITY_SIZE) == 0) {
632 char *bptr = nptr - 1;
633 char *eptr = optr + MSG_TKN_CAPABILITY_SIZE;
634 token = (char *)MSG_ORIG(MSG_TKN_CAPABILITY);
635
636 /*
637 * $CAPABILITY expansion required. Expansion is only
638 * allowed for non-simple path names (must contain a
639 * '/'), with the token itself being the last element
640 * of the path. Therefore, all we need do is test the
641 * existence of the string "/$CAPABILITY\0".
642 */
643 if (((omit & PD_TKN_CAP) == 0) &&
644 ((bptr > _name) && (*bptr == '/') &&
645 ((*eptr == '\0') || (*eptr == ':')))) {
646 /*
647 * Decrement the present pointer so that the
648 * directories trailing "/" gets nuked later.
649 */
650 nptr--, nlen--;
651 olen += MSG_TKN_CAPABILITY_SIZE;
652 optr += MSG_TKN_CAPABILITY_SIZE;
653 _flags |= PD_TKN_CAP;
654 }
655
656 } else if (strncmp(optr, MSG_ORIG(MSG_TKN_HWCAP),
657 MSG_TKN_HWCAP_SIZE) == 0) {
658 char *bptr = nptr - 1;
659 char *eptr = optr + MSG_TKN_HWCAP_SIZE;
660 token = (char *)MSG_ORIG(MSG_TKN_HWCAP);
661
662 /*
663 * $HWCAP expansion required. This token has been
664 * superseeded by $CAPABILITY. For compatibility with
665 * older environments, only expand this token when hard-
666 * ware capability information is available. This
667 * expansion is only allowed for non-simple path names
668 * (must contain a '/'), with the token itself being the
669 * last element of the path. Therefore, all we need do
670 * is test the existence of the string "/$HWCAP\0".
671 */
672 if (((omit & PD_TKN_CAP) == 0) &&
673 (rtld_flags2 & RT_FL2_HWCAP) &&
674 ((bptr > _name) && (*bptr == '/') &&
675 ((*eptr == '\0') || (*eptr == ':')))) {
676 /*
677 * Decrement the present pointer so that the
678 * directories trailing "/" gets nuked later.
679 */
680 nptr--, nlen--;
681 olen += MSG_TKN_HWCAP_SIZE;
682 optr += MSG_TKN_HWCAP_SIZE;
683 _flags |= PD_TKN_CAP;
684 }
685
686 } else {
687 /*
688 * If reserved token was not found, copy the
689 * character.
690 */
691 *nptr++ = '$';
692 nlen++;
693 }
694
695 /*
696 * If a reserved token was found, and could not be expanded,
697 * diagnose the error condition.
698 */
699 if (token) {
700 if (_flags)
701 flags |= _flags;
702 else {
703 char buf[PATH_MAX], *str;
704
705 /*
706 * Note, the original string we're expanding
707 * might contain a number of ':' separated
708 * paths. Isolate the path we're processing to
709 * provide a more precise error diagnostic.
710 */
711 if (str = strchr(oname, ':')) {
712 size_t slen = str - oname;
713
714 (void) strncpy(buf, oname, slen);
715 buf[slen] = '\0';
716 str = buf;
717 } else
718 str = oname;
719
720 eprintf(lml, ERR_FATAL,
721 MSG_INTL(MSG_ERR_EXPAND2), NAME(lmp),
722 str, token);
723 return (0);
724 }
725 }
726 _optr = optr;
727 }
728
729 /*
730 * First make sure the current length is shorter than PATH_MAX. We may
731 * arrive here if the given path contains '$' characters which are not
732 * the lead of a reserved token.
733 */
734 if (nlen >= PATH_MAX) {
735 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_ERR_EXPAND1), NAME(lmp),
736 oname);
737 return (0);
738 }
739
740 /*
741 * If any ISALIST processing has occurred not only do we return the
742 * expanded node we're presently working on, but we can also update the
743 * remaining list so that it is effectively prepended with this node
744 * expanded to all remaining ISALIST options. Note that we can only
745 * handle one ISALIST per node. For more than one ISALIST to be
746 * processed we'd need a better algorithm than above to replace the
747 * newly generated list. Whether we want to encourage the number of
748 * path name permutations this would provide is another question. So,
749 * for now if more than one ISALIST is encountered we return the
750 * original node untouched.
751 */
752 if (isa && isaflag) {
753 if (isaflag == 1) {
754 if (list)
755 *list = _list;
756 } else {
757 flags &= ~PD_TKN_ISALIST;
758 if ((nptr = (char *)stravl_insert(*name, 0,
759 (*len + 1), 1)) == NULL)
760 return (0);
761 *name = nptr;
762 return (TKN_NONE);
763 }
764 }
765
766 /*
767 * Copy any remaining string. Terminate the new string with a null as
768 * this string can be displayed via debugging diagnostics.
769 */
770 if ((_len = (optr - _optr)) != 0) {
771 if ((nlen += _len) < PATH_MAX) {
772 (void) strncpy(nptr, _optr, _len);
773 nptr = nptr + _len;
774 } else {
775 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_ERR_EXPAND1),
776 NAME(lmp), oname);
777 return (0);
778 }
779 }
780 *nptr = '\0';
781
782 /*
783 * A path that has been expanded is typically used to create full
784 * path names for objects that will be opened. The final path name is
785 * resolved to simplify it, and set the stage for possible $ORIGIN
786 * processing. Therefore, it's usually unnecessary to resolve the path
787 * at this point. However, if a configuration file, containing
788 * directory information is in use, then we might need to lookup this
789 * path in the configuration file. To keep the number of path name
790 * resolutions to a minimum, only resolve paths that contain "./". The
791 * use of "$ORIGIN/../lib" will probably only match a configuration file
792 * entry after resolution.
793 */
794 if (list && (rtld_flags & RT_FL_DIRCFG) && (flags & TKN_DOTSLASH)) {
795 int len;
796
797 if ((len = resolvepath(_name, _name, (PATH_MAX - 1))) >= 0) {
798 nlen = (size_t)len;
799 _name[nlen] = '\0';
800 flags |= PD_TKN_RESOLVED;
801 }
802 }
803
804 /*
805 * Allocate a new string if necessary.
806 *
807 * If any form of token expansion, or string resolution has occurred,
808 * the storage must be allocated for the new string.
809 *
810 * If we're processing a substring, for example, any string besides the
811 * last string within a search path "A:B:C", then this substring needs
812 * to be isolated with a null terminator. However, if this search path
813 * was created from a previous ISALIST expansion, then all strings must
814 * be allocated, as the isalist expansion will be freed after expansion
815 * processing.
816 */
817 if ((nptr = (char *)stravl_insert(_name, 0, (nlen + 1), 1)) == NULL)
818 return (0);
819 *name = nptr;
820 *len = nlen;
821 return (flags ? flags : TKN_NONE);
822 }
823
824 /*
825 * Determine whether a path name is secure.
826 */
827 int
828 is_path_secure(char *opath, Rt_map *clmp, uint_t info, uint_t flags)
829 {
830 Alist **salpp;
831 Aliste idx;
832 char buffer[PATH_MAX], *npath = NULL;
833 Lm_list *lml = LIST(clmp);
834 Pdesc *pdp;
835
836 /*
837 * If a path name originates from a configuration file, use it. The use
838 * of a configuration file is already validated for secure applications,
839 * so if we're using a configuration file, we must be able to use all
840 * that it defines.
841 */
842 if (info & LA_SER_CONFIG)
843 return (1);
844
845 if ((info & LA_SER_MASK) == 0) {
846 char *str;
847
848 /*
849 * If the path name specifies a file (rather than a directory),
850 * peel off the file before making the comparison.
851 */
852 str = strrchr(opath, '/');
853
854 /*
855 * Carry out some initial security checks.
856 *
857 * . a simple file name (one containing no "/") is fine, as
858 * this file name will be combined with search paths to
859 * determine the complete path. Note, a secure application
860 * may provide a configuration file, and this can only be
861 * a full path name (PN_FLG_FULLPATH).
862 * . a full path (one starting with "/") is fine, provided
863 * this path name isn't a preload/audit path.
864 * . provided $ORIGIN expansion has not been employed, the
865 * above categories of path are deemed secure.
866 */
867 if ((((str == 0) && ((info & PD_FLG_FULLPATH) == 0)) ||
868 ((*opath == '/') && (str != opath) &&
869 ((info & PD_FLG_EXTLOAD) == 0))) &&
870 ((flags & PD_TKN_ORIGIN) == 0))
871 return (1);
872
873 /*
874 * Determine the directory name of the present path.
875 */
876 if (str) {
877 if (str == opath)
878 npath = (char *)MSG_ORIG(MSG_STR_SLASH);
879 else {
880 size_t size;
881
882 if ((size = str - opath) >= PATH_MAX)
883 return (0);
884
885 (void) strncpy(buffer, opath, size);
886 buffer[size] = '\0';
887 npath = buffer;
888 }
889
890 /*
891 * If $ORIGIN processing has been employed, then allow
892 * any directory that has already been used to satisfy
893 * other dependencies, to be used.
894 */
895 if ((flags & PD_TKN_ORIGIN) &&
896 pnavl_recorded(&spavl, npath, 0, NULL)) {
897 DBG_CALL(Dbg_libs_insecure(lml, npath, 1));
898 return (1);
899 }
900 }
901 } else {
902 /*
903 * A search path, i.e., RPATH, configuration file path, etc. is
904 * used as is. Exceptions to this are:
905 *
906 * . LD_LIBRARY_PATH.
907 * . any $ORIGIN expansion, unless used by a setuid ld.so.1
908 * to find its own dependencies, or the path name has
909 * already been used to find other dependencies.
910 * . any relative path.
911 */
912 if (((info & LA_SER_LIBPATH) == 0) && (*opath == '/') &&
913 ((flags & PD_TKN_ORIGIN) == 0))
914 return (1);
915
916 /*
917 * If $ORIGIN processing is requested, allow a setuid ld.so.1
918 * to use this path for its own dependencies. Allow the
919 * application to use this path name only if the path name has
920 * already been used to locate other dependencies.
921 */
922 if (flags & PD_TKN_ORIGIN) {
923 if ((lml->lm_flags & LML_FLG_RTLDLM) &&
924 is_rtld_setuid())
925 return (1);
926 else if (pnavl_recorded(&spavl, opath, 0, NULL)) {
927 DBG_CALL(Dbg_libs_insecure(lml, opath, 1));
928 return (1);
929 }
930 }
931 npath = (char *)opath;
932 }
933
934 /*
935 * Determine whether the present directory is trusted.
936 */
937 if (npath) {
938 salpp = LM_SECURE_DIRS(LIST(clmp)->lm_head)();
939 for (ALIST_TRAVERSE(*salpp, idx, pdp)) {
940 if (strcmp(npath, pdp->pd_pname) == 0)
941 return (1);
942 }
943 }
944
945 /*
946 * The path is insecure, so depending on the caller, provide a
947 * diagnostic. Preloaded, or audit libraries generate a warning, as
948 * the process will run without them.
949 */
950 if (info & PD_FLG_EXTLOAD) {
951 if (lml->lm_flags & LML_FLG_TRC_ENABLE) {
952 if ((FLAGS1(clmp) & FL1_RT_LDDSTUB) == 0)
953 (void) printf(MSG_INTL(MSG_LDD_FIL_ILLEGAL),
954 opath);
955 } else
956 eprintf(lml, ERR_WARNING, MSG_INTL(MSG_SEC_ILLEGAL),
957 opath);
958
959 return (0);
960 }
961
962 /*
963 * Explicit file references are fatal.
964 */
965 if ((info & LA_SER_MASK) == 0) {
966 if (lml->lm_flags & LML_FLG_TRC_ENABLE) {
967 /* BEGIN CSTYLED */
968 if ((FLAGS1(clmp) & FL1_RT_LDDSTUB) == 0) {
969 if (lml->lm_flags &
970 (LML_FLG_TRC_VERBOSE | LML_FLG_TRC_SEARCH))
971 (void) printf(
972 MSG_INTL(MSG_LDD_FIL_FIND),
973 opath, NAME(clmp));
974
975 if (((rtld_flags & RT_FL_SILENCERR) == 0) ||
976 (lml->lm_flags & LML_FLG_TRC_VERBOSE))
977 (void) printf(
978 MSG_INTL(MSG_LDD_FIL_ILLEGAL),
979 opath);
980 }
981 /* END CSTYLED */
982 } else
983 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_SYS_OPEN), opath,
984 strerror(EACCES));
985 } else {
986 /*
987 * Search paths.
988 */
989 DBG_CALL(Dbg_libs_insecure(lml, opath, 0));
990 if ((lml->lm_flags & LML_FLG_TRC_SEARCH) &&
991 ((FLAGS1(clmp) & FL1_RT_LDDSTUB) == 0))
992 (void) printf(MSG_INTL(MSG_LDD_PTH_IGNORE), opath);
993 }
994 return (0);
995 }
996
997 /*
998 * Determine whether a path already exists within the callers Pnode list.
999 */
1000 inline static uint_t
1001 is_path_unique(Alist *alp, const char *path)
1002 {
1003 Aliste idx;
1004 Pdesc *pdp;
1005
1006 for (ALIST_TRAVERSE(alp, idx, pdp)) {
1007 if (pdp->pd_plen && (strcmp(pdp->pd_pname, path) == 0))
1008 return (PD_FLG_DUPLICAT);
1009 }
1010 return (0);
1011 }
1012
1013 /*
1014 * Expand one or more path names. This routine is called for all path strings,
1015 * i.e., NEEDED, rpaths, default search paths, configuration file search paths,
1016 * filtees, etc. The path may be a single path name, or a colon separated list
1017 * of path names. Each individual path name is processed for possible reserved
1018 * token expansion. All string nodes are maintained in allocated memory
1019 * (regardless of whether they are constant (":"), or token expanded) to
1020 * simplify path name descriptor removal.
1021 *
1022 * The info argument passes in auxiliary information regarding the callers
1023 * intended use of the path names. This information may be maintained in the
1024 * path name descriptor element produced to describe the path name (i.e.,
1025 * LA_SER_LIBPATH etc.), or may be used to determine additional security or
1026 * diagnostic processing.
1027 */
1028 int
1029 expand_paths(Rt_map *clmp, const char *list, Alist **alpp, Aliste alni,
1030 uint_t orig, uint_t omit)
1031 {
1032 char *str, *olist = 0, *nlist = (char *)list;
1033 int fnull = FALSE; /* TRUE if empty final path segment seen */
1034 Pdesc *pdp = NULL;
1035
1036 for (str = nlist; *nlist || fnull; str = nlist) {
1037 char *ostr;
1038 char *elist = NULL;
1039 size_t len, olen;
1040 uint_t tkns = 0;
1041
1042 if (*nlist == ';')
1043 ++nlist, ++str;
1044 if ((*nlist == ':') || fnull) {
1045 /* If not a final null segment, check following one */
1046 fnull = !(fnull || *(nlist + 1));
1047
1048 if (*nlist)
1049 nlist++;
1050
1051 /*
1052 * When the shell sees a null PATH segment, it
1053 * treats it as if it were the cwd (.). We mimic
1054 * this behavior for LD_LIBRARY_PATH and runpaths
1055 * (mainly for backwards compatibility with previous
1056 * behavior). For other paths, this makes no sense,
1057 * so we simply ignore the segment.
1058 */
1059 if (!(orig & (LA_SER_LIBPATH | LA_SER_RUNPATH)))
1060 continue; /* Process next segment */
1061
1062 str = (char *)MSG_ORIG(MSG_FMT_CWD);
1063 len = MSG_FMT_CWD_SIZE;
1064
1065 } else {
1066 uint_t _tkns;
1067
1068 len = 0;
1069 while (*nlist && (*nlist != ':') && (*nlist != ';')) {
1070 if (*nlist == '/')
1071 tkns |= PD_FLG_PNSLASH;
1072 nlist++, len++;
1073 }
1074
1075 /* Check for a following final null segment */
1076 fnull = (*nlist == ':') && !*(nlist + 1);
1077
1078 if (*nlist)
1079 nlist++;
1080
1081 /*
1082 * Expand the captured string. Besides expanding the
1083 * present path/file entry, we may have a new list to
1084 * deal with (ISALIST expands to multiple new entries).
1085 */
1086 elist = nlist;
1087 ostr = str;
1088 olen = len;
1089 if ((_tkns = expand(&str, &len, &elist, orig, omit,
1090 clmp)) == 0)
1091 continue;
1092 tkns |= _tkns;
1093 }
1094
1095 /*
1096 * If this a secure application, validation of the expanded
1097 * path name may be necessary.
1098 */
1099 if ((rtld_flags & RT_FL_SECURE) &&
1100 (is_path_secure(str, clmp, orig, tkns) == 0))
1101 continue;
1102
1103 /*
1104 * If required, ensure that the string is unique. For search
1105 * paths such as LD_LIBRARY_PATH, users often inherit multiple
1106 * paths which result in unnecessary duplication. Note, if
1107 * we're debugging, any duplicate entry is retained and flagged
1108 * so that the entry can be diagnosed later as part of unused
1109 * processing.
1110 */
1111 if (orig & PD_FLG_UNIQUE) {
1112 Word tracing;
1113
1114 tracing = LIST(clmp)->lm_flags &
1115 (LML_FLG_TRC_UNREF | LML_FLG_TRC_UNUSED);
1116 tkns |= is_path_unique(*alpp, str);
1117
1118 /*
1119 * Note, use the debug strings rpl_debug and prm_debug
1120 * as an indicator that debugging has been requested,
1121 * rather than DBG_ENABLE(), as the initial use of
1122 * LD_LIBRARY_PATH occurs in preparation for loading
1123 * our debugging library.
1124 */
1125 if ((tkns & PD_FLG_DUPLICAT) && (tracing == 0) &&
1126 (rpl_debug == 0) && (prm_debug == 0))
1127 continue;
1128 }
1129
1130 /*
1131 * Create a new pathname descriptor.
1132 */
1133 if ((pdp = alist_append(alpp, NULL, sizeof (Pdesc),
1134 alni)) == NULL)
1135 return (0);
1136
1137 pdp->pd_pname = str;
1138 pdp->pd_plen = len;
1139 pdp->pd_flags = (orig & LA_SER_MASK) | (tkns & PD_MSK_INHERIT);
1140
1141 /*
1142 * If token expansion occurred, maintain the original string.
1143 * This string can be used to provide a more informative error
1144 * diagnostic for a file that fails to load, or for displaying
1145 * unused search paths.
1146 */
1147 if ((tkns & PD_MSK_EXPAND) && ((pdp->pd_oname =
1148 stravl_insert(ostr, 0, (olen + 1), 1)) == NULL))
1149 return (0);
1150
1151 /*
1152 * Now that any duplication of the original string has occurred,
1153 * release any previous old listing.
1154 */
1155 if (elist && (elist != nlist)) {
1156 free(olist);
1157 nlist = olist = elist;
1158 }
1159 }
1160
1161 free(olist);
1162
1163 /*
1164 * If no paths could be determined (perhaps because of security), then
1165 * indicate a failure.
1166 */
1167 return (pdp != NULL);
1168 }
1169
1170 /*
1171 * Establish an objects fully resolved path.
1172 *
1173 * When $ORIGIN was first introduced, the expansion of a relative path name was
1174 * deferred until it was required. However now we insure a full path name is
1175 * always created - things like the analyzer wish to rely on librtld_db
1176 * returning a full path. The overhead of this is perceived to be low,
1177 * providing the associated libc version of getcwd is available (see 4336878).
1178 * This getcwd() was ported back to Solaris 8.1.
1179 */
1180 size_t
1181 fullpath(Rt_map *lmp, Fdesc *fdp)
1182 {
1183 const char *name;
1184
1185 /*
1186 * Determine whether this path name is already resolved.
1187 */
1188 if (fdp && (fdp->fd_flags & FLG_FD_RESOLVED)) {
1189 /*
1190 * If the resolved path differed from the original name, the
1191 * resolved path would have been recorded as the fd_pname.
1192 * Steal this path name from the file descriptor. Otherwise,
1193 * the path name is the same as the name of this object.
1194 */
1195 if (fdp->fd_pname)
1196 PATHNAME(lmp) = fdp->fd_pname;
1197 else
1198 PATHNAME(lmp) = NAME(lmp);
1199 } else {
1200 /*
1201 * If this path name has not yet been resolved, resolve the
1202 * current name.
1203 */
1204 char _path[PATH_MAX];
1205 const char *path;
1206 int size, rsize;
1207
1208 if (fdp && fdp->fd_pname)
1209 PATHNAME(lmp) = fdp->fd_pname;
1210 else
1211 PATHNAME(lmp) = NAME(lmp);
1212
1213 name = path = PATHNAME(lmp);
1214 size = strlen(name);
1215
1216 if (path[0] != '/') {
1217 /*
1218 * If we can't determine the current directory (possible
1219 * if too many files are open - EMFILE), or if the
1220 * created path is too big, simply revert back to the
1221 * initial path name.
1222 */
1223 if (getcwd(_path, (PATH_MAX - 2 - size)) != NULL) {
1224 (void) strcat(_path, MSG_ORIG(MSG_STR_SLASH));
1225 (void) strcat(_path, name);
1226 path = _path;
1227 size = strlen(path);
1228 }
1229 }
1230
1231 /*
1232 * See if the path name can be reduced further.
1233 */
1234 if ((rsize = resolvepath(path, _path, (PATH_MAX - 1))) > 0) {
1235 _path[rsize] = '\0';
1236 path = _path;
1237 size = rsize;
1238 }
1239
1240 /*
1241 * If the path name is different from the original, duplicate it
1242 * so that it is available in a core file. If the duplication
1243 * fails simply leave the original path name alone.
1244 */
1245 if ((PATHNAME(lmp) =
1246 stravl_insert(path, 0, (size + 1), 0)) == NULL)
1247 PATHNAME(lmp) = name;
1248 }
1249
1250 name = ORIGNAME(lmp) = PATHNAME(lmp);
1251
1252 /*
1253 * Establish the directory name size - this also acts as a flag that the
1254 * directory name has been computed.
1255 */
1256 DIRSZ(lmp) = strrchr(name, '/') - name;
1257 return (DIRSZ(lmp));
1258 }
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