1/*- 2 * Copyright (c) 1999-2002, 2007 Robert N. M. Watson 3 * Copyright (c) 2001-2005 Networks Associates Technology, Inc. 4 * Copyright (c) 2005 Tom Rhodes 5 * Copyright (c) 2006 SPARTA, Inc. 6 * All rights reserved. 7 * 8 * This software was developed by Robert Watson for the TrustedBSD Project. --- 23 unchanged lines hidden (view full) --- 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * |
40 * $FreeBSD: head/sys/security/mac_bsdextended/mac_bsdextended.c 172955 2007-10-25 11:31:11Z rwatson $ |
41 */ 42 43/* 44 * Developed by the TrustedBSD Project. 45 * 46 * "BSD Extended" MAC policy, allowing the administrator to impose mandatory 47 * firewall-like rules regarding users and file system objects. 48 */ --- 11 unchanged lines hidden (view full) --- 60#include <sys/systm.h> 61#include <sys/vnode.h> 62#include <sys/sysctl.h> 63#include <sys/syslog.h> 64 65#include <security/mac/mac_policy.h> 66#include <security/mac_bsdextended/mac_bsdextended.h> 67 |
68static struct mtx ugidfw_mtx; |
69 70SYSCTL_DECL(_security_mac); 71 72SYSCTL_NODE(_security_mac, OID_AUTO, bsdextended, CTLFLAG_RW, 0, 73 "TrustedBSD extended BSD MAC policy controls"); 74 |
75static int ugidfw_enabled = 1; |
76SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, enabled, CTLFLAG_RW, |
77 &ugidfw_enabled, 0, "Enforce extended BSD policy"); 78TUNABLE_INT("security.mac.bsdextended.enabled", &ugidfw_enabled); |
79 80MALLOC_DEFINE(M_MACBSDEXTENDED, "mac_bsdextended", "BSD Extended MAC rule"); 81 82#define MAC_BSDEXTENDED_MAXRULES 250 83static struct mac_bsdextended_rule *rules[MAC_BSDEXTENDED_MAXRULES]; 84static int rule_count = 0; 85static int rule_slots = 0; 86static int rule_version = MB_VERSION; --- 4 unchanged lines hidden (view full) --- 91 &rule_slots, 0, "Number of used rule slots\n"); 92SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, rule_version, CTLFLAG_RD, 93 &rule_version, 0, "Version number for API\n"); 94 95/* 96 * This is just used for logging purposes, eventually we would like to log 97 * much more then failed requests. 98 */ |
99static int ugidfw_logging; |
100SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, logging, CTLFLAG_RW, |
101 &ugidfw_logging, 0, "Log failed authorization requests"); |
102 103/* 104 * This tunable is here for compatibility. It will allow the user to switch 105 * between the new mode (first rule matches) and the old functionality (all 106 * rules match). 107 */ |
108static int ugidfw_firstmatch_enabled; |
109SYSCTL_INT(_security_mac_bsdextended, OID_AUTO, firstmatch_enabled, |
110 CTLFLAG_RW, &ugidfw_firstmatch_enabled, 1, |
111 "Disable/enable match first rule functionality"); 112 113static int |
114ugidfw_rule_valid(struct mac_bsdextended_rule *rule) |
115{ 116 117 if ((rule->mbr_subject.mbs_flags | MBS_ALL_FLAGS) != MBS_ALL_FLAGS) 118 return (EINVAL); 119 if ((rule->mbr_subject.mbs_neg | MBS_ALL_FLAGS) != MBS_ALL_FLAGS) 120 return (EINVAL); 121 if ((rule->mbr_object.mbo_flags | MBO_ALL_FLAGS) != MBO_ALL_FLAGS) 122 return (EINVAL); --- 27 unchanged lines hidden (view full) --- 150 if (req->newptr && req->newlen != 0) { 151 error = SYSCTL_IN(req, &temprule, sizeof(temprule)); 152 if (error) 153 return (error); 154 MALLOC(ruleptr, struct mac_bsdextended_rule *, 155 sizeof(*ruleptr), M_MACBSDEXTENDED, M_WAITOK | M_ZERO); 156 } 157 |
158 mtx_lock(&ugidfw_mtx); |
159 if (req->oldptr) { 160 if (index < 0 || index > rule_slots + 1) { 161 error = ENOENT; 162 goto out; 163 } 164 if (rules[index] == NULL) { 165 error = ENOENT; 166 goto out; --- 5 unchanged lines hidden (view full) --- 172 ruleptr = rules[index]; 173 if (ruleptr == NULL) { 174 error = ENOENT; 175 goto out; 176 } 177 rule_count--; 178 rules[index] = NULL; 179 } else if (req->newptr) { |
180 error = ugidfw_rule_valid(&temprule); |
181 if (error) 182 goto out; 183 if (rules[index] == NULL) { 184 *ruleptr = temprule; 185 rules[index] = ruleptr; 186 ruleptr = NULL; 187 if (index + 1 > rule_slots) 188 rule_slots = index + 1; 189 rule_count++; 190 } else 191 *rules[index] = temprule; 192 } 193out: |
194 mtx_unlock(&ugidfw_mtx); |
195 if (ruleptr != NULL) 196 FREE(ruleptr, M_MACBSDEXTENDED); 197 if (req->oldptr && error == 0) 198 error = SYSCTL_OUT(req, &temprule, sizeof(temprule)); 199 return (error); 200} 201 202SYSCTL_NODE(_security_mac_bsdextended, OID_AUTO, rules, CTLFLAG_RW, 203 sysctl_rule, "BSD extended MAC rules"); 204 205static void |
206ugidfw_init(struct mac_policy_conf *mpc) |
207{ 208 |
209 mtx_init(&ugidfw_mtx, "mac_bsdextended lock", NULL, MTX_DEF); |
210} 211 212static void |
213ugidfw_destroy(struct mac_policy_conf *mpc) |
214{ 215 |
216 mtx_destroy(&ugidfw_mtx); |
217} 218 219static int |
220ugidfw_rulecheck(struct mac_bsdextended_rule *rule, |
221 struct ucred *cred, struct vnode *vp, struct vattr *vap, int acc_mode) 222{ 223 int match; 224 int i; 225 226 /* 227 * Is there a subject match? 228 */ |
229 mtx_assert(&ugidfw_mtx, MA_OWNED); |
230 if (rule->mbr_subject.mbs_flags & MBS_UID_DEFINED) { 231 match = ((cred->cr_uid <= rule->mbr_subject.mbs_uid_max && 232 cred->cr_uid >= rule->mbr_subject.mbs_uid_min) || 233 (cred->cr_ruid <= rule->mbr_subject.mbs_uid_max && 234 cred->cr_ruid >= rule->mbr_subject.mbs_uid_min) || 235 (cred->cr_svuid <= rule->mbr_subject.mbs_uid_max && 236 cred->cr_svuid >= rule->mbr_subject.mbs_uid_min)); 237 if (rule->mbr_subject.mbs_neg & MBS_UID_DEFINED) --- 131 unchanged lines hidden (view full) --- 369 if (!match) 370 return (0); 371 } 372 373 /* 374 * Is the access permitted? 375 */ 376 if ((rule->mbr_mode & acc_mode) != acc_mode) { |
377 if (ugidfw_logging) |
378 log(LOG_AUTHPRIV, "mac_bsdextended: %d:%d request %d" 379 " on %d:%d failed. \n", cred->cr_ruid, 380 cred->cr_rgid, acc_mode, vap->va_uid, 381 vap->va_gid); 382 return (EACCES); 383 } 384 385 /* 386 * If the rule matched, permits access, and first match is enabled, 387 * return success. 388 */ |
389 if (ugidfw_firstmatch_enabled) |
390 return (EJUSTRETURN); 391 else 392 return (0); 393} 394 395static int |
396ugidfw_check(struct ucred *cred, struct vnode *vp, struct vattr *vap, |
397 int acc_mode) 398{ 399 int error, i; 400 401 /* 402 * XXXRW: More specific privilege selection needed. 403 */ 404 if (suser_cred(cred, 0) == 0) 405 return (0); 406 407 /* 408 * Since we do not separately handle append, map append to write. 409 */ 410 if (acc_mode & MBI_APPEND) { 411 acc_mode &= ~MBI_APPEND; 412 acc_mode |= MBI_WRITE; 413 } |
414 mtx_lock(&ugidfw_mtx); |
415 for (i = 0; i < rule_slots; i++) { 416 if (rules[i] == NULL) 417 continue; |
418 error = ugidfw_rulecheck(rules[i], cred, |
419 vp, vap, acc_mode); 420 if (error == EJUSTRETURN) 421 break; 422 if (error) { |
423 mtx_unlock(&ugidfw_mtx); |
424 return (error); 425 } 426 } |
427 mtx_unlock(&ugidfw_mtx); |
428 return (0); 429} 430 431static int |
432ugidfw_check_vp(struct ucred *cred, struct vnode *vp, int acc_mode) |
433{ 434 int error; 435 struct vattr vap; 436 |
437 if (!ugidfw_enabled) |
438 return (0); 439 error = VOP_GETATTR(vp, &vap, cred, curthread); 440 if (error) 441 return (error); |
442 return (ugidfw_check(cred, vp, &vap, acc_mode)); |
443} 444 445static int |
446ugidfw_system_check_acct(struct ucred *cred, struct vnode *vp, |
447 struct label *vplabel) 448{ 449 |
450 return (ugidfw_check_vp(cred, vp, MBI_WRITE)); |
451} 452 453static int |
454ugidfw_system_check_auditctl(struct ucred *cred, struct vnode *vp, |
455 struct label *vplabel) 456{ 457 |
458 return (ugidfw_check_vp(cred, vp, MBI_WRITE)); |
459} 460 461static int |
462ugidfw_system_check_swapoff(struct ucred *cred, struct vnode *vp, |
463 struct label *vplabel) 464{ 465 |
466 return (ugidfw_check_vp(cred, vp, MBI_WRITE)); |
467} 468 469static int |
470ugidfw_system_check_swapon(struct ucred *cred, struct vnode *vp, |
471 struct label *vplabel) 472{ 473 |
474 return (ugidfw_check_vp(cred, vp, MBI_WRITE)); |
475} 476 477static int |
478ugidfw_vnode_check_access(struct ucred *cred, struct vnode *vp, |
479 struct label *vplabel, int acc_mode) 480{ 481 |
482 return (ugidfw_check_vp(cred, vp, acc_mode)); |
483} 484 485static int |
486ugidfw_vnode_check_chdir(struct ucred *cred, struct vnode *dvp, |
487 struct label *dvplabel) 488{ 489 |
490 return (ugidfw_check_vp(cred, dvp, MBI_EXEC)); |
491} 492 493static int |
494ugidfw_vnode_check_chroot(struct ucred *cred, struct vnode *dvp, |
495 struct label *dvplabel) 496{ 497 |
498 return (ugidfw_check_vp(cred, dvp, MBI_EXEC)); |
499} 500 501static int |
502ugidfw_check_create_vnode(struct ucred *cred, struct vnode *dvp, |
503 struct label *dvplabel, struct componentname *cnp, struct vattr *vap) 504{ 505 |
506 return (ugidfw_check_vp(cred, dvp, MBI_WRITE)); |
507} 508 509static int |
510ugidfw_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp, |
511 struct label *vplabel, acl_type_t type) 512{ 513 |
514 return (ugidfw_check_vp(cred, vp, MBI_ADMIN)); |
515} 516 517static int |
518ugidfw_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp, 519 struct label *vplabel, int attrnamespace, const char *name) |
520{ 521 |
522 return (ugidfw_check_vp(cred, vp, MBI_WRITE)); |
523} 524 525static int |
526ugidfw_vnode_check_exec(struct ucred *cred, struct vnode *vp, |
527 struct label *vplabel, struct image_params *imgp, 528 struct label *execlabel) 529{ 530 |
531 return (ugidfw_check_vp(cred, vp, MBI_READ|MBI_EXEC)); |
532} 533 534static int |
535ugidfw_vnode_check_getacl(struct ucred *cred, struct vnode *vp, |
536 struct label *vplabel, acl_type_t type) 537{ 538 |
539 return (ugidfw_check_vp(cred, vp, MBI_STAT)); |
540} 541 542static int |
543ugidfw_vnode_check_getextattr(struct ucred *cred, struct vnode *vp, |
544 struct label *vplabel, int attrnamespace, const char *name, 545 struct uio *uio) 546{ 547 |
548 return (ugidfw_check_vp(cred, vp, MBI_READ)); |
549} 550 551static int |
552ugidfw_vnode_check_link(struct ucred *cred, struct vnode *dvp, |
553 struct label *dvplabel, struct vnode *vp, struct label *label, 554 struct componentname *cnp) 555{ 556 int error; 557 |
558 error = ugidfw_check_vp(cred, dvp, MBI_WRITE); |
559 if (error) 560 return (error); |
561 error = ugidfw_check_vp(cred, vp, MBI_WRITE); |
562 if (error) 563 return (error); 564 return (0); 565} 566 567static int |
568ugidfw_vnode_check_listextattr(struct ucred *cred, struct vnode *vp, |
569 struct label *vplabel, int attrnamespace) 570{ 571 |
572 return (ugidfw_check_vp(cred, vp, MBI_READ)); |
573} 574 575static int |
576ugidfw_vnode_check_lookup(struct ucred *cred, struct vnode *dvp, |
577 struct label *dvplabel, struct componentname *cnp) 578{ 579 |
580 return (ugidfw_check_vp(cred, dvp, MBI_EXEC)); |
581} 582 583static int |
584ugidfw_vnode_check_open(struct ucred *cred, struct vnode *vp, |
585 struct label *vplabel, int acc_mode) 586{ 587 |
588 return (ugidfw_check_vp(cred, vp, acc_mode)); |
589} 590 591static int |
592ugidfw_vnode_check_readdir(struct ucred *cred, struct vnode *dvp, |
593 struct label *dvplabel) 594{ 595 |
596 return (ugidfw_check_vp(cred, dvp, MBI_READ)); |
597} 598 599static int |
600ugidfw_vnode_check_readdlink(struct ucred *cred, struct vnode *vp, |
601 struct label *vplabel) 602{ 603 |
604 return (ugidfw_check_vp(cred, vp, MBI_READ)); |
605} 606 607static int |
608ugidfw_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp, |
609 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 610 struct componentname *cnp) 611{ 612 int error; 613 |
614 error = ugidfw_check_vp(cred, dvp, MBI_WRITE); |
615 if (error) 616 return (error); |
617 return (ugidfw_check_vp(cred, vp, MBI_WRITE)); |
618} 619 620static int |
621ugidfw_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp, |
622 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 623 int samedir, struct componentname *cnp) 624{ 625 int error; 626 |
627 error = ugidfw_check_vp(cred, dvp, MBI_WRITE); |
628 if (error) 629 return (error); 630 if (vp != NULL) |
631 error = ugidfw_check_vp(cred, vp, MBI_WRITE); |
632 return (error); 633} 634 635static int |
636ugidfw_vnode_check_revoke(struct ucred *cred, struct vnode *vp, |
637 struct label *vplabel) 638{ 639 |
640 return (ugidfw_check_vp(cred, vp, MBI_ADMIN)); |
641} 642 643static int |
644ugidfw_check_setacl_vnode(struct ucred *cred, struct vnode *vp, |
645 struct label *vplabel, acl_type_t type, struct acl *acl) 646{ 647 |
648 return (ugidfw_check_vp(cred, vp, MBI_ADMIN)); |
649} 650 651static int |
652ugidfw_vnode_check_setextattr(struct ucred *cred, struct vnode *vp, |
653 struct label *vplabel, int attrnamespace, const char *name, 654 struct uio *uio) 655{ 656 |
657 return (ugidfw_check_vp(cred, vp, MBI_WRITE)); |
658} 659 660static int |
661ugidfw_vnode_check_setflags(struct ucred *cred, struct vnode *vp, |
662 struct label *vplabel, u_long flags) 663{ 664 |
665 return (ugidfw_check_vp(cred, vp, MBI_ADMIN)); |
666} 667 668static int |
669ugidfw_vnode_check_setmode(struct ucred *cred, struct vnode *vp, |
670 struct label *vplabel, mode_t mode) 671{ 672 |
673 return (ugidfw_check_vp(cred, vp, MBI_ADMIN)); |
674} 675 676static int |
677ugidfw_vnode_check_setowner(struct ucred *cred, struct vnode *vp, |
678 struct label *vplabel, uid_t uid, gid_t gid) 679{ 680 |
681 return (ugidfw_check_vp(cred, vp, MBI_ADMIN)); |
682} 683 684static int |
685ugidfw_vnode_check_setutimes(struct ucred *cred, struct vnode *vp, |
686 struct label *vplabel, struct timespec atime, struct timespec utime) 687{ 688 |
689 return (ugidfw_check_vp(cred, vp, MBI_ADMIN)); |
690} 691 692static int |
693ugidfw_vnode_check_stat(struct ucred *active_cred, |
694 struct ucred *file_cred, struct vnode *vp, struct label *vplabel) 695{ 696 |
697 return (ugidfw_check_vp(active_cred, vp, MBI_STAT)); |
698} 699 700static int |
701ugidfw_vnode_check_unlink(struct ucred *cred, struct vnode *dvp, |
702 struct label *dvplabel, struct vnode *vp, struct label *vplabel, 703 struct componentname *cnp) 704{ 705 int error; 706 |
707 error = ugidfw_check_vp(cred, dvp, MBI_WRITE); |
708 if (error) 709 return (error); |
710 return (ugidfw_check_vp(cred, vp, MBI_WRITE)); |
711} 712 |
713static struct mac_policy_ops ugidfw_ops = |
714{ |
715 .mpo_destroy = ugidfw_destroy, 716 .mpo_init = ugidfw_init, 717 .mpo_system_check_acct = ugidfw_system_check_acct, 718 .mpo_system_check_auditctl = ugidfw_system_check_auditctl, 719 .mpo_system_check_swapoff = ugidfw_system_check_swapoff, 720 .mpo_system_check_swapon = ugidfw_system_check_swapon, 721 .mpo_vnode_check_access = ugidfw_vnode_check_access, 722 .mpo_vnode_check_chdir = ugidfw_vnode_check_chdir, 723 .mpo_vnode_check_chroot = ugidfw_vnode_check_chroot, 724 .mpo_vnode_check_create = ugidfw_check_create_vnode, 725 .mpo_vnode_check_deleteacl = ugidfw_vnode_check_deleteacl, 726 .mpo_vnode_check_deleteextattr = ugidfw_vnode_check_deleteextattr, 727 .mpo_vnode_check_exec = ugidfw_vnode_check_exec, 728 .mpo_vnode_check_getacl = ugidfw_vnode_check_getacl, 729 .mpo_vnode_check_getextattr = ugidfw_vnode_check_getextattr, 730 .mpo_vnode_check_link = ugidfw_vnode_check_link, 731 .mpo_vnode_check_listextattr = ugidfw_vnode_check_listextattr, 732 .mpo_vnode_check_lookup = ugidfw_vnode_check_lookup, 733 .mpo_vnode_check_open = ugidfw_vnode_check_open, 734 .mpo_vnode_check_readdir = ugidfw_vnode_check_readdir, 735 .mpo_vnode_check_readlink = ugidfw_vnode_check_readdlink, 736 .mpo_vnode_check_rename_from = ugidfw_vnode_check_rename_from, 737 .mpo_vnode_check_rename_to = ugidfw_vnode_check_rename_to, 738 .mpo_vnode_check_revoke = ugidfw_vnode_check_revoke, 739 .mpo_vnode_check_setacl = ugidfw_check_setacl_vnode, 740 .mpo_vnode_check_setextattr = ugidfw_vnode_check_setextattr, 741 .mpo_vnode_check_setflags = ugidfw_vnode_check_setflags, 742 .mpo_vnode_check_setmode = ugidfw_vnode_check_setmode, 743 .mpo_vnode_check_setowner = ugidfw_vnode_check_setowner, 744 .mpo_vnode_check_setutimes = ugidfw_vnode_check_setutimes, 745 .mpo_vnode_check_stat = ugidfw_vnode_check_stat, 746 .mpo_vnode_check_unlink = ugidfw_vnode_check_unlink, |
747}; 748 |
749MAC_POLICY_SET(&ugidfw_ops, mac_bsdextended, "TrustedBSD MAC/BSD Extended", 750 MPC_LOADTIME_FLAG_UNLOADOK, NULL); |