1 /* 2 * Simplified MAC Kernel (smack) security module 3 * 4 * This file contains the smack hook function implementations. 5 * 6 * Authors: 7 * Casey Schaufler <casey@schaufler-ca.com> 8 * Jarkko Sakkinen <jarkko.sakkinen@intel.com> 9 * 10 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> 11 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. 12 * Paul Moore <paul@paul-moore.com> 13 * Copyright (C) 2010 Nokia Corporation 14 * Copyright (C) 2011 Intel Corporation. 15 * 16 * This program is free software; you can redistribute it and/or modify 17 * it under the terms of the GNU General Public License version 2, 18 * as published by the Free Software Foundation. 19 */ 20 21 #include <linux/xattr.h> 22 #include <linux/pagemap.h> 23 #include <linux/mount.h> 24 #include <linux/stat.h> 25 #include <linux/kd.h> 26 #include <asm/ioctls.h> 27 #include <linux/ip.h> 28 #include <linux/tcp.h> 29 #include <linux/udp.h> 30 #include <linux/dccp.h> 31 #include <linux/slab.h> 32 #include <linux/mutex.h> 33 #include <linux/pipe_fs_i.h> 34 #include <net/cipso_ipv4.h> 35 #include <net/ip.h> 36 #include <net/ipv6.h> 37 #include <linux/audit.h> 38 #include <linux/magic.h> 39 #include <linux/dcache.h> 40 #include <linux/personality.h> 41 #include <linux/msg.h> 42 #include <linux/shm.h> 43 #include <linux/binfmts.h> 44 #include "smack.h" 45 46 #define task_security(task) (task_cred_xxx((task), security)) 47 48 #define TRANS_TRUE "TRUE" 49 #define TRANS_TRUE_SIZE 4 50 51 #define SMK_CONNECTING 0 52 #define SMK_RECEIVING 1 53 #define SMK_SENDING 2 54 55 LIST_HEAD(smk_ipv6_port_list); 56 57 /** 58 * smk_fetch - Fetch the smack label from a file. 59 * @ip: a pointer to the inode 60 * @dp: a pointer to the dentry 61 * 62 * Returns a pointer to the master list entry for the Smack label 63 * or NULL if there was no label to fetch. 64 */ 65 static struct smack_known *smk_fetch(const char *name, struct inode *ip, 66 struct dentry *dp) 67 { 68 int rc; 69 char *buffer; 70 struct smack_known *skp = NULL; 71 72 if (ip->i_op->getxattr == NULL) 73 return NULL; 74 75 buffer = kzalloc(SMK_LONGLABEL, GFP_KERNEL); 76 if (buffer == NULL) 77 return NULL; 78 79 rc = ip->i_op->getxattr(dp, name, buffer, SMK_LONGLABEL); 80 if (rc > 0) 81 skp = smk_import_entry(buffer, rc); 82 83 kfree(buffer); 84 85 return skp; 86 } 87 88 /** 89 * new_inode_smack - allocate an inode security blob 90 * @smack: a pointer to the Smack label to use in the blob 91 * 92 * Returns the new blob or NULL if there's no memory available 93 */ 94 struct inode_smack *new_inode_smack(char *smack) 95 { 96 struct inode_smack *isp; 97 98 isp = kzalloc(sizeof(struct inode_smack), GFP_NOFS); 99 if (isp == NULL) 100 return NULL; 101 102 isp->smk_inode = smack; 103 isp->smk_flags = 0; 104 mutex_init(&isp->smk_lock); 105 106 return isp; 107 } 108 109 /** 110 * new_task_smack - allocate a task security blob 111 * @smack: a pointer to the Smack label to use in the blob 112 * 113 * Returns the new blob or NULL if there's no memory available 114 */ 115 static struct task_smack *new_task_smack(struct smack_known *task, 116 struct smack_known *forked, gfp_t gfp) 117 { 118 struct task_smack *tsp; 119 120 tsp = kzalloc(sizeof(struct task_smack), gfp); 121 if (tsp == NULL) 122 return NULL; 123 124 tsp->smk_task = task; 125 tsp->smk_forked = forked; 126 INIT_LIST_HEAD(&tsp->smk_rules); 127 mutex_init(&tsp->smk_rules_lock); 128 129 return tsp; 130 } 131 132 /** 133 * smk_copy_rules - copy a rule set 134 * @nhead - new rules header pointer 135 * @ohead - old rules header pointer 136 * 137 * Returns 0 on success, -ENOMEM on error 138 */ 139 static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead, 140 gfp_t gfp) 141 { 142 struct smack_rule *nrp; 143 struct smack_rule *orp; 144 int rc = 0; 145 146 INIT_LIST_HEAD(nhead); 147 148 list_for_each_entry_rcu(orp, ohead, list) { 149 nrp = kzalloc(sizeof(struct smack_rule), gfp); 150 if (nrp == NULL) { 151 rc = -ENOMEM; 152 break; 153 } 154 *nrp = *orp; 155 list_add_rcu(&nrp->list, nhead); 156 } 157 return rc; 158 } 159 160 /* 161 * LSM hooks. 162 * We he, that is fun! 163 */ 164 165 /** 166 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH 167 * @ctp: child task pointer 168 * @mode: ptrace attachment mode 169 * 170 * Returns 0 if access is OK, an error code otherwise 171 * 172 * Do the capability checks, and require read and write. 173 */ 174 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) 175 { 176 int rc; 177 struct smk_audit_info ad; 178 struct smack_known *skp; 179 180 rc = cap_ptrace_access_check(ctp, mode); 181 if (rc != 0) 182 return rc; 183 184 skp = smk_of_task(task_security(ctp)); 185 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 186 smk_ad_setfield_u_tsk(&ad, ctp); 187 188 rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad); 189 return rc; 190 } 191 192 /** 193 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME 194 * @ptp: parent task pointer 195 * 196 * Returns 0 if access is OK, an error code otherwise 197 * 198 * Do the capability checks, and require read and write. 199 */ 200 static int smack_ptrace_traceme(struct task_struct *ptp) 201 { 202 int rc; 203 struct smk_audit_info ad; 204 struct smack_known *skp; 205 206 rc = cap_ptrace_traceme(ptp); 207 if (rc != 0) 208 return rc; 209 210 skp = smk_of_task(task_security(ptp)); 211 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 212 smk_ad_setfield_u_tsk(&ad, ptp); 213 214 rc = smk_curacc(skp->smk_known, MAY_READWRITE, &ad); 215 return rc; 216 } 217 218 /** 219 * smack_syslog - Smack approval on syslog 220 * @type: message type 221 * 222 * Require that the task has the floor label 223 * 224 * Returns 0 on success, error code otherwise. 225 */ 226 static int smack_syslog(int typefrom_file) 227 { 228 int rc = 0; 229 struct smack_known *skp = smk_of_current(); 230 231 if (smack_privileged(CAP_MAC_OVERRIDE)) 232 return 0; 233 234 if (skp != &smack_known_floor) 235 rc = -EACCES; 236 237 return rc; 238 } 239 240 241 /* 242 * Superblock Hooks. 243 */ 244 245 /** 246 * smack_sb_alloc_security - allocate a superblock blob 247 * @sb: the superblock getting the blob 248 * 249 * Returns 0 on success or -ENOMEM on error. 250 */ 251 static int smack_sb_alloc_security(struct super_block *sb) 252 { 253 struct superblock_smack *sbsp; 254 255 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); 256 257 if (sbsp == NULL) 258 return -ENOMEM; 259 260 sbsp->smk_root = smack_known_floor.smk_known; 261 sbsp->smk_default = smack_known_floor.smk_known; 262 sbsp->smk_floor = smack_known_floor.smk_known; 263 sbsp->smk_hat = smack_known_hat.smk_known; 264 /* 265 * smk_initialized will be zero from kzalloc. 266 */ 267 sb->s_security = sbsp; 268 269 return 0; 270 } 271 272 /** 273 * smack_sb_free_security - free a superblock blob 274 * @sb: the superblock getting the blob 275 * 276 */ 277 static void smack_sb_free_security(struct super_block *sb) 278 { 279 kfree(sb->s_security); 280 sb->s_security = NULL; 281 } 282 283 /** 284 * smack_sb_copy_data - copy mount options data for processing 285 * @orig: where to start 286 * @smackopts: mount options string 287 * 288 * Returns 0 on success or -ENOMEM on error. 289 * 290 * Copy the Smack specific mount options out of the mount 291 * options list. 292 */ 293 static int smack_sb_copy_data(char *orig, char *smackopts) 294 { 295 char *cp, *commap, *otheropts, *dp; 296 297 otheropts = (char *)get_zeroed_page(GFP_KERNEL); 298 if (otheropts == NULL) 299 return -ENOMEM; 300 301 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { 302 if (strstr(cp, SMK_FSDEFAULT) == cp) 303 dp = smackopts; 304 else if (strstr(cp, SMK_FSFLOOR) == cp) 305 dp = smackopts; 306 else if (strstr(cp, SMK_FSHAT) == cp) 307 dp = smackopts; 308 else if (strstr(cp, SMK_FSROOT) == cp) 309 dp = smackopts; 310 else if (strstr(cp, SMK_FSTRANS) == cp) 311 dp = smackopts; 312 else 313 dp = otheropts; 314 315 commap = strchr(cp, ','); 316 if (commap != NULL) 317 *commap = '\0'; 318 319 if (*dp != '\0') 320 strcat(dp, ","); 321 strcat(dp, cp); 322 } 323 324 strcpy(orig, otheropts); 325 free_page((unsigned long)otheropts); 326 327 return 0; 328 } 329 330 /** 331 * smack_sb_kern_mount - Smack specific mount processing 332 * @sb: the file system superblock 333 * @flags: the mount flags 334 * @data: the smack mount options 335 * 336 * Returns 0 on success, an error code on failure 337 */ 338 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) 339 { 340 struct dentry *root = sb->s_root; 341 struct inode *inode = root->d_inode; 342 struct superblock_smack *sp = sb->s_security; 343 struct inode_smack *isp; 344 char *op; 345 char *commap; 346 char *nsp; 347 int transmute = 0; 348 349 if (sp->smk_initialized) 350 return 0; 351 352 sp->smk_initialized = 1; 353 354 for (op = data; op != NULL; op = commap) { 355 commap = strchr(op, ','); 356 if (commap != NULL) 357 *commap++ = '\0'; 358 359 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { 360 op += strlen(SMK_FSHAT); 361 nsp = smk_import(op, 0); 362 if (nsp != NULL) 363 sp->smk_hat = nsp; 364 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { 365 op += strlen(SMK_FSFLOOR); 366 nsp = smk_import(op, 0); 367 if (nsp != NULL) 368 sp->smk_floor = nsp; 369 } else if (strncmp(op, SMK_FSDEFAULT, 370 strlen(SMK_FSDEFAULT)) == 0) { 371 op += strlen(SMK_FSDEFAULT); 372 nsp = smk_import(op, 0); 373 if (nsp != NULL) 374 sp->smk_default = nsp; 375 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { 376 op += strlen(SMK_FSROOT); 377 nsp = smk_import(op, 0); 378 if (nsp != NULL) 379 sp->smk_root = nsp; 380 } else if (strncmp(op, SMK_FSTRANS, strlen(SMK_FSTRANS)) == 0) { 381 op += strlen(SMK_FSTRANS); 382 nsp = smk_import(op, 0); 383 if (nsp != NULL) { 384 sp->smk_root = nsp; 385 transmute = 1; 386 } 387 } 388 } 389 390 /* 391 * Initialize the root inode. 392 */ 393 isp = inode->i_security; 394 if (inode->i_security == NULL) { 395 inode->i_security = new_inode_smack(sp->smk_root); 396 isp = inode->i_security; 397 } else 398 isp->smk_inode = sp->smk_root; 399 400 if (transmute) 401 isp->smk_flags |= SMK_INODE_TRANSMUTE; 402 403 return 0; 404 } 405 406 /** 407 * smack_sb_statfs - Smack check on statfs 408 * @dentry: identifies the file system in question 409 * 410 * Returns 0 if current can read the floor of the filesystem, 411 * and error code otherwise 412 */ 413 static int smack_sb_statfs(struct dentry *dentry) 414 { 415 struct superblock_smack *sbp = dentry->d_sb->s_security; 416 int rc; 417 struct smk_audit_info ad; 418 419 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 420 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 421 422 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); 423 return rc; 424 } 425 426 /** 427 * smack_sb_mount - Smack check for mounting 428 * @dev_name: unused 429 * @path: mount point 430 * @type: unused 431 * @flags: unused 432 * @data: unused 433 * 434 * Returns 0 if current can write the floor of the filesystem 435 * being mounted on, an error code otherwise. 436 */ 437 static int smack_sb_mount(const char *dev_name, struct path *path, 438 const char *type, unsigned long flags, void *data) 439 { 440 struct superblock_smack *sbp = path->dentry->d_sb->s_security; 441 struct smk_audit_info ad; 442 443 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); 444 smk_ad_setfield_u_fs_path(&ad, *path); 445 446 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); 447 } 448 449 /** 450 * smack_sb_umount - Smack check for unmounting 451 * @mnt: file system to unmount 452 * @flags: unused 453 * 454 * Returns 0 if current can write the floor of the filesystem 455 * being unmounted, an error code otherwise. 456 */ 457 static int smack_sb_umount(struct vfsmount *mnt, int flags) 458 { 459 struct superblock_smack *sbp; 460 struct smk_audit_info ad; 461 struct path path; 462 463 path.dentry = mnt->mnt_root; 464 path.mnt = mnt; 465 466 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); 467 smk_ad_setfield_u_fs_path(&ad, path); 468 469 sbp = path.dentry->d_sb->s_security; 470 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); 471 } 472 473 /* 474 * BPRM hooks 475 */ 476 477 /** 478 * smack_bprm_set_creds - set creds for exec 479 * @bprm: the exec information 480 * 481 * Returns 0 if it gets a blob, -ENOMEM otherwise 482 */ 483 static int smack_bprm_set_creds(struct linux_binprm *bprm) 484 { 485 struct inode *inode = file_inode(bprm->file); 486 struct task_smack *bsp = bprm->cred->security; 487 struct inode_smack *isp; 488 int rc; 489 490 rc = cap_bprm_set_creds(bprm); 491 if (rc != 0) 492 return rc; 493 494 if (bprm->cred_prepared) 495 return 0; 496 497 isp = inode->i_security; 498 if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) 499 return 0; 500 501 if (bprm->unsafe) 502 return -EPERM; 503 504 bsp->smk_task = isp->smk_task; 505 bprm->per_clear |= PER_CLEAR_ON_SETID; 506 507 return 0; 508 } 509 510 /** 511 * smack_bprm_committing_creds - Prepare to install the new credentials 512 * from bprm. 513 * 514 * @bprm: binprm for exec 515 */ 516 static void smack_bprm_committing_creds(struct linux_binprm *bprm) 517 { 518 struct task_smack *bsp = bprm->cred->security; 519 520 if (bsp->smk_task != bsp->smk_forked) 521 current->pdeath_signal = 0; 522 } 523 524 /** 525 * smack_bprm_secureexec - Return the decision to use secureexec. 526 * @bprm: binprm for exec 527 * 528 * Returns 0 on success. 529 */ 530 static int smack_bprm_secureexec(struct linux_binprm *bprm) 531 { 532 struct task_smack *tsp = current_security(); 533 int ret = cap_bprm_secureexec(bprm); 534 535 if (!ret && (tsp->smk_task != tsp->smk_forked)) 536 ret = 1; 537 538 return ret; 539 } 540 541 /* 542 * Inode hooks 543 */ 544 545 /** 546 * smack_inode_alloc_security - allocate an inode blob 547 * @inode: the inode in need of a blob 548 * 549 * Returns 0 if it gets a blob, -ENOMEM otherwise 550 */ 551 static int smack_inode_alloc_security(struct inode *inode) 552 { 553 struct smack_known *skp = smk_of_current(); 554 555 inode->i_security = new_inode_smack(skp->smk_known); 556 if (inode->i_security == NULL) 557 return -ENOMEM; 558 return 0; 559 } 560 561 /** 562 * smack_inode_free_security - free an inode blob 563 * @inode: the inode with a blob 564 * 565 * Clears the blob pointer in inode 566 */ 567 static void smack_inode_free_security(struct inode *inode) 568 { 569 kfree(inode->i_security); 570 inode->i_security = NULL; 571 } 572 573 /** 574 * smack_inode_init_security - copy out the smack from an inode 575 * @inode: the inode 576 * @dir: unused 577 * @qstr: unused 578 * @name: where to put the attribute name 579 * @value: where to put the attribute value 580 * @len: where to put the length of the attribute 581 * 582 * Returns 0 if it all works out, -ENOMEM if there's no memory 583 */ 584 static int smack_inode_init_security(struct inode *inode, struct inode *dir, 585 const struct qstr *qstr, const char **name, 586 void **value, size_t *len) 587 { 588 struct inode_smack *issp = inode->i_security; 589 struct smack_known *skp = smk_of_current(); 590 char *isp = smk_of_inode(inode); 591 char *dsp = smk_of_inode(dir); 592 int may; 593 594 if (name) 595 *name = XATTR_SMACK_SUFFIX; 596 597 if (value) { 598 rcu_read_lock(); 599 may = smk_access_entry(skp->smk_known, dsp, &skp->smk_rules); 600 rcu_read_unlock(); 601 602 /* 603 * If the access rule allows transmutation and 604 * the directory requests transmutation then 605 * by all means transmute. 606 * Mark the inode as changed. 607 */ 608 if (may > 0 && ((may & MAY_TRANSMUTE) != 0) && 609 smk_inode_transmutable(dir)) { 610 isp = dsp; 611 issp->smk_flags |= SMK_INODE_CHANGED; 612 } 613 614 *value = kstrdup(isp, GFP_NOFS); 615 if (*value == NULL) 616 return -ENOMEM; 617 } 618 619 if (len) 620 *len = strlen(isp) + 1; 621 622 return 0; 623 } 624 625 /** 626 * smack_inode_link - Smack check on link 627 * @old_dentry: the existing object 628 * @dir: unused 629 * @new_dentry: the new object 630 * 631 * Returns 0 if access is permitted, an error code otherwise 632 */ 633 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, 634 struct dentry *new_dentry) 635 { 636 char *isp; 637 struct smk_audit_info ad; 638 int rc; 639 640 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 641 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); 642 643 isp = smk_of_inode(old_dentry->d_inode); 644 rc = smk_curacc(isp, MAY_WRITE, &ad); 645 646 if (rc == 0 && new_dentry->d_inode != NULL) { 647 isp = smk_of_inode(new_dentry->d_inode); 648 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); 649 rc = smk_curacc(isp, MAY_WRITE, &ad); 650 } 651 652 return rc; 653 } 654 655 /** 656 * smack_inode_unlink - Smack check on inode deletion 657 * @dir: containing directory object 658 * @dentry: file to unlink 659 * 660 * Returns 0 if current can write the containing directory 661 * and the object, error code otherwise 662 */ 663 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) 664 { 665 struct inode *ip = dentry->d_inode; 666 struct smk_audit_info ad; 667 int rc; 668 669 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 670 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 671 672 /* 673 * You need write access to the thing you're unlinking 674 */ 675 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); 676 if (rc == 0) { 677 /* 678 * You also need write access to the containing directory 679 */ 680 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); 681 smk_ad_setfield_u_fs_inode(&ad, dir); 682 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); 683 } 684 return rc; 685 } 686 687 /** 688 * smack_inode_rmdir - Smack check on directory deletion 689 * @dir: containing directory object 690 * @dentry: directory to unlink 691 * 692 * Returns 0 if current can write the containing directory 693 * and the directory, error code otherwise 694 */ 695 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) 696 { 697 struct smk_audit_info ad; 698 int rc; 699 700 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 701 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 702 703 /* 704 * You need write access to the thing you're removing 705 */ 706 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); 707 if (rc == 0) { 708 /* 709 * You also need write access to the containing directory 710 */ 711 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); 712 smk_ad_setfield_u_fs_inode(&ad, dir); 713 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); 714 } 715 716 return rc; 717 } 718 719 /** 720 * smack_inode_rename - Smack check on rename 721 * @old_inode: the old directory 722 * @old_dentry: unused 723 * @new_inode: the new directory 724 * @new_dentry: unused 725 * 726 * Read and write access is required on both the old and 727 * new directories. 728 * 729 * Returns 0 if access is permitted, an error code otherwise 730 */ 731 static int smack_inode_rename(struct inode *old_inode, 732 struct dentry *old_dentry, 733 struct inode *new_inode, 734 struct dentry *new_dentry) 735 { 736 int rc; 737 char *isp; 738 struct smk_audit_info ad; 739 740 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 741 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); 742 743 isp = smk_of_inode(old_dentry->d_inode); 744 rc = smk_curacc(isp, MAY_READWRITE, &ad); 745 746 if (rc == 0 && new_dentry->d_inode != NULL) { 747 isp = smk_of_inode(new_dentry->d_inode); 748 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); 749 rc = smk_curacc(isp, MAY_READWRITE, &ad); 750 } 751 return rc; 752 } 753 754 /** 755 * smack_inode_permission - Smack version of permission() 756 * @inode: the inode in question 757 * @mask: the access requested 758 * 759 * This is the important Smack hook. 760 * 761 * Returns 0 if access is permitted, -EACCES otherwise 762 */ 763 static int smack_inode_permission(struct inode *inode, int mask) 764 { 765 struct smk_audit_info ad; 766 int no_block = mask & MAY_NOT_BLOCK; 767 768 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); 769 /* 770 * No permission to check. Existence test. Yup, it's there. 771 */ 772 if (mask == 0) 773 return 0; 774 775 /* May be droppable after audit */ 776 if (no_block) 777 return -ECHILD; 778 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE); 779 smk_ad_setfield_u_fs_inode(&ad, inode); 780 return smk_curacc(smk_of_inode(inode), mask, &ad); 781 } 782 783 /** 784 * smack_inode_setattr - Smack check for setting attributes 785 * @dentry: the object 786 * @iattr: for the force flag 787 * 788 * Returns 0 if access is permitted, an error code otherwise 789 */ 790 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) 791 { 792 struct smk_audit_info ad; 793 /* 794 * Need to allow for clearing the setuid bit. 795 */ 796 if (iattr->ia_valid & ATTR_FORCE) 797 return 0; 798 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 799 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 800 801 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); 802 } 803 804 /** 805 * smack_inode_getattr - Smack check for getting attributes 806 * @mnt: unused 807 * @dentry: the object 808 * 809 * Returns 0 if access is permitted, an error code otherwise 810 */ 811 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) 812 { 813 struct smk_audit_info ad; 814 struct path path; 815 816 path.dentry = dentry; 817 path.mnt = mnt; 818 819 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); 820 smk_ad_setfield_u_fs_path(&ad, path); 821 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); 822 } 823 824 /** 825 * smack_inode_setxattr - Smack check for setting xattrs 826 * @dentry: the object 827 * @name: name of the attribute 828 * @value: unused 829 * @size: unused 830 * @flags: unused 831 * 832 * This protects the Smack attribute explicitly. 833 * 834 * Returns 0 if access is permitted, an error code otherwise 835 */ 836 static int smack_inode_setxattr(struct dentry *dentry, const char *name, 837 const void *value, size_t size, int flags) 838 { 839 struct smk_audit_info ad; 840 int rc = 0; 841 842 if (strcmp(name, XATTR_NAME_SMACK) == 0 || 843 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || 844 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || 845 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || 846 strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { 847 if (!smack_privileged(CAP_MAC_ADMIN)) 848 rc = -EPERM; 849 /* 850 * check label validity here so import wont fail on 851 * post_setxattr 852 */ 853 if (size == 0 || size >= SMK_LONGLABEL || 854 smk_import(value, size) == NULL) 855 rc = -EINVAL; 856 } else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { 857 if (!smack_privileged(CAP_MAC_ADMIN)) 858 rc = -EPERM; 859 if (size != TRANS_TRUE_SIZE || 860 strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0) 861 rc = -EINVAL; 862 } else 863 rc = cap_inode_setxattr(dentry, name, value, size, flags); 864 865 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 866 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 867 868 if (rc == 0) 869 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); 870 871 return rc; 872 } 873 874 /** 875 * smack_inode_post_setxattr - Apply the Smack update approved above 876 * @dentry: object 877 * @name: attribute name 878 * @value: attribute value 879 * @size: attribute size 880 * @flags: unused 881 * 882 * Set the pointer in the inode blob to the entry found 883 * in the master label list. 884 */ 885 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, 886 const void *value, size_t size, int flags) 887 { 888 struct smack_known *skp; 889 struct inode_smack *isp = dentry->d_inode->i_security; 890 891 if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { 892 isp->smk_flags |= SMK_INODE_TRANSMUTE; 893 return; 894 } 895 896 skp = smk_import_entry(value, size); 897 if (strcmp(name, XATTR_NAME_SMACK) == 0) { 898 if (skp != NULL) 899 isp->smk_inode = skp->smk_known; 900 else 901 isp->smk_inode = smack_known_invalid.smk_known; 902 } else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) { 903 if (skp != NULL) 904 isp->smk_task = skp; 905 else 906 isp->smk_task = &smack_known_invalid; 907 } else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) { 908 if (skp != NULL) 909 isp->smk_mmap = skp; 910 else 911 isp->smk_mmap = &smack_known_invalid; 912 } 913 914 return; 915 } 916 917 /** 918 * smack_inode_getxattr - Smack check on getxattr 919 * @dentry: the object 920 * @name: unused 921 * 922 * Returns 0 if access is permitted, an error code otherwise 923 */ 924 static int smack_inode_getxattr(struct dentry *dentry, const char *name) 925 { 926 struct smk_audit_info ad; 927 928 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 929 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 930 931 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); 932 } 933 934 /** 935 * smack_inode_removexattr - Smack check on removexattr 936 * @dentry: the object 937 * @name: name of the attribute 938 * 939 * Removing the Smack attribute requires CAP_MAC_ADMIN 940 * 941 * Returns 0 if access is permitted, an error code otherwise 942 */ 943 static int smack_inode_removexattr(struct dentry *dentry, const char *name) 944 { 945 struct inode_smack *isp; 946 struct smk_audit_info ad; 947 int rc = 0; 948 949 if (strcmp(name, XATTR_NAME_SMACK) == 0 || 950 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || 951 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0 || 952 strcmp(name, XATTR_NAME_SMACKEXEC) == 0 || 953 strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0 || 954 strcmp(name, XATTR_NAME_SMACKMMAP)) { 955 if (!smack_privileged(CAP_MAC_ADMIN)) 956 rc = -EPERM; 957 } else 958 rc = cap_inode_removexattr(dentry, name); 959 960 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); 961 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 962 if (rc == 0) 963 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); 964 965 if (rc == 0) { 966 isp = dentry->d_inode->i_security; 967 isp->smk_task = NULL; 968 isp->smk_mmap = NULL; 969 } 970 971 return rc; 972 } 973 974 /** 975 * smack_inode_getsecurity - get smack xattrs 976 * @inode: the object 977 * @name: attribute name 978 * @buffer: where to put the result 979 * @alloc: unused 980 * 981 * Returns the size of the attribute or an error code 982 */ 983 static int smack_inode_getsecurity(const struct inode *inode, 984 const char *name, void **buffer, 985 bool alloc) 986 { 987 struct socket_smack *ssp; 988 struct socket *sock; 989 struct super_block *sbp; 990 struct inode *ip = (struct inode *)inode; 991 char *isp; 992 int ilen; 993 int rc = 0; 994 995 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { 996 isp = smk_of_inode(inode); 997 ilen = strlen(isp) + 1; 998 *buffer = isp; 999 return ilen; 1000 } 1001 1002 /* 1003 * The rest of the Smack xattrs are only on sockets. 1004 */ 1005 sbp = ip->i_sb; 1006 if (sbp->s_magic != SOCKFS_MAGIC) 1007 return -EOPNOTSUPP; 1008 1009 sock = SOCKET_I(ip); 1010 if (sock == NULL || sock->sk == NULL) 1011 return -EOPNOTSUPP; 1012 1013 ssp = sock->sk->sk_security; 1014 1015 if (strcmp(name, XATTR_SMACK_IPIN) == 0) 1016 isp = ssp->smk_in; 1017 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) 1018 isp = ssp->smk_out->smk_known; 1019 else 1020 return -EOPNOTSUPP; 1021 1022 ilen = strlen(isp) + 1; 1023 if (rc == 0) { 1024 *buffer = isp; 1025 rc = ilen; 1026 } 1027 1028 return rc; 1029 } 1030 1031 1032 /** 1033 * smack_inode_listsecurity - list the Smack attributes 1034 * @inode: the object 1035 * @buffer: where they go 1036 * @buffer_size: size of buffer 1037 * 1038 * Returns 0 on success, -EINVAL otherwise 1039 */ 1040 static int smack_inode_listsecurity(struct inode *inode, char *buffer, 1041 size_t buffer_size) 1042 { 1043 int len = strlen(XATTR_NAME_SMACK); 1044 1045 if (buffer != NULL && len <= buffer_size) { 1046 memcpy(buffer, XATTR_NAME_SMACK, len); 1047 return len; 1048 } 1049 return -EINVAL; 1050 } 1051 1052 /** 1053 * smack_inode_getsecid - Extract inode's security id 1054 * @inode: inode to extract the info from 1055 * @secid: where result will be saved 1056 */ 1057 static void smack_inode_getsecid(const struct inode *inode, u32 *secid) 1058 { 1059 struct inode_smack *isp = inode->i_security; 1060 1061 *secid = smack_to_secid(isp->smk_inode); 1062 } 1063 1064 /* 1065 * File Hooks 1066 */ 1067 1068 /** 1069 * smack_file_permission - Smack check on file operations 1070 * @file: unused 1071 * @mask: unused 1072 * 1073 * Returns 0 1074 * 1075 * Should access checks be done on each read or write? 1076 * UNICOS and SELinux say yes. 1077 * Trusted Solaris, Trusted Irix, and just about everyone else says no. 1078 * 1079 * I'll say no for now. Smack does not do the frequent 1080 * label changing that SELinux does. 1081 */ 1082 static int smack_file_permission(struct file *file, int mask) 1083 { 1084 return 0; 1085 } 1086 1087 /** 1088 * smack_file_alloc_security - assign a file security blob 1089 * @file: the object 1090 * 1091 * The security blob for a file is a pointer to the master 1092 * label list, so no allocation is done. 1093 * 1094 * Returns 0 1095 */ 1096 static int smack_file_alloc_security(struct file *file) 1097 { 1098 struct smack_known *skp = smk_of_current(); 1099 1100 file->f_security = skp->smk_known; 1101 return 0; 1102 } 1103 1104 /** 1105 * smack_file_free_security - clear a file security blob 1106 * @file: the object 1107 * 1108 * The security blob for a file is a pointer to the master 1109 * label list, so no memory is freed. 1110 */ 1111 static void smack_file_free_security(struct file *file) 1112 { 1113 file->f_security = NULL; 1114 } 1115 1116 /** 1117 * smack_file_ioctl - Smack check on ioctls 1118 * @file: the object 1119 * @cmd: what to do 1120 * @arg: unused 1121 * 1122 * Relies heavily on the correct use of the ioctl command conventions. 1123 * 1124 * Returns 0 if allowed, error code otherwise 1125 */ 1126 static int smack_file_ioctl(struct file *file, unsigned int cmd, 1127 unsigned long arg) 1128 { 1129 int rc = 0; 1130 struct smk_audit_info ad; 1131 1132 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); 1133 smk_ad_setfield_u_fs_path(&ad, file->f_path); 1134 1135 if (_IOC_DIR(cmd) & _IOC_WRITE) 1136 rc = smk_curacc(file->f_security, MAY_WRITE, &ad); 1137 1138 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) 1139 rc = smk_curacc(file->f_security, MAY_READ, &ad); 1140 1141 return rc; 1142 } 1143 1144 /** 1145 * smack_file_lock - Smack check on file locking 1146 * @file: the object 1147 * @cmd: unused 1148 * 1149 * Returns 0 if current has write access, error code otherwise 1150 */ 1151 static int smack_file_lock(struct file *file, unsigned int cmd) 1152 { 1153 struct smk_audit_info ad; 1154 1155 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); 1156 smk_ad_setfield_u_fs_path(&ad, file->f_path); 1157 return smk_curacc(file->f_security, MAY_WRITE, &ad); 1158 } 1159 1160 /** 1161 * smack_file_fcntl - Smack check on fcntl 1162 * @file: the object 1163 * @cmd: what action to check 1164 * @arg: unused 1165 * 1166 * Generally these operations are harmless. 1167 * File locking operations present an obvious mechanism 1168 * for passing information, so they require write access. 1169 * 1170 * Returns 0 if current has access, error code otherwise 1171 */ 1172 static int smack_file_fcntl(struct file *file, unsigned int cmd, 1173 unsigned long arg) 1174 { 1175 struct smk_audit_info ad; 1176 int rc = 0; 1177 1178 1179 switch (cmd) { 1180 case F_GETLK: 1181 case F_SETLK: 1182 case F_SETLKW: 1183 case F_SETOWN: 1184 case F_SETSIG: 1185 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); 1186 smk_ad_setfield_u_fs_path(&ad, file->f_path); 1187 rc = smk_curacc(file->f_security, MAY_WRITE, &ad); 1188 break; 1189 default: 1190 break; 1191 } 1192 1193 return rc; 1194 } 1195 1196 /** 1197 * smack_mmap_file : 1198 * Check permissions for a mmap operation. The @file may be NULL, e.g. 1199 * if mapping anonymous memory. 1200 * @file contains the file structure for file to map (may be NULL). 1201 * @reqprot contains the protection requested by the application. 1202 * @prot contains the protection that will be applied by the kernel. 1203 * @flags contains the operational flags. 1204 * Return 0 if permission is granted. 1205 */ 1206 static int smack_mmap_file(struct file *file, 1207 unsigned long reqprot, unsigned long prot, 1208 unsigned long flags) 1209 { 1210 struct smack_known *skp; 1211 struct smack_known *mkp; 1212 struct smack_rule *srp; 1213 struct task_smack *tsp; 1214 char *osmack; 1215 struct inode_smack *isp; 1216 int may; 1217 int mmay; 1218 int tmay; 1219 int rc; 1220 1221 if (file == NULL) 1222 return 0; 1223 1224 isp = file_inode(file)->i_security; 1225 if (isp->smk_mmap == NULL) 1226 return 0; 1227 mkp = isp->smk_mmap; 1228 1229 tsp = current_security(); 1230 skp = smk_of_current(); 1231 rc = 0; 1232 1233 rcu_read_lock(); 1234 /* 1235 * For each Smack rule associated with the subject 1236 * label verify that the SMACK64MMAP also has access 1237 * to that rule's object label. 1238 */ 1239 list_for_each_entry_rcu(srp, &skp->smk_rules, list) { 1240 osmack = srp->smk_object; 1241 /* 1242 * Matching labels always allows access. 1243 */ 1244 if (mkp->smk_known == osmack) 1245 continue; 1246 /* 1247 * If there is a matching local rule take 1248 * that into account as well. 1249 */ 1250 may = smk_access_entry(srp->smk_subject->smk_known, osmack, 1251 &tsp->smk_rules); 1252 if (may == -ENOENT) 1253 may = srp->smk_access; 1254 else 1255 may &= srp->smk_access; 1256 /* 1257 * If may is zero the SMACK64MMAP subject can't 1258 * possibly have less access. 1259 */ 1260 if (may == 0) 1261 continue; 1262 1263 /* 1264 * Fetch the global list entry. 1265 * If there isn't one a SMACK64MMAP subject 1266 * can't have as much access as current. 1267 */ 1268 mmay = smk_access_entry(mkp->smk_known, osmack, 1269 &mkp->smk_rules); 1270 if (mmay == -ENOENT) { 1271 rc = -EACCES; 1272 break; 1273 } 1274 /* 1275 * If there is a local entry it modifies the 1276 * potential access, too. 1277 */ 1278 tmay = smk_access_entry(mkp->smk_known, osmack, 1279 &tsp->smk_rules); 1280 if (tmay != -ENOENT) 1281 mmay &= tmay; 1282 1283 /* 1284 * If there is any access available to current that is 1285 * not available to a SMACK64MMAP subject 1286 * deny access. 1287 */ 1288 if ((may | mmay) != mmay) { 1289 rc = -EACCES; 1290 break; 1291 } 1292 } 1293 1294 rcu_read_unlock(); 1295 1296 return rc; 1297 } 1298 1299 /** 1300 * smack_file_set_fowner - set the file security blob value 1301 * @file: object in question 1302 * 1303 * Returns 0 1304 * Further research may be required on this one. 1305 */ 1306 static int smack_file_set_fowner(struct file *file) 1307 { 1308 struct smack_known *skp = smk_of_current(); 1309 1310 file->f_security = skp->smk_known; 1311 return 0; 1312 } 1313 1314 /** 1315 * smack_file_send_sigiotask - Smack on sigio 1316 * @tsk: The target task 1317 * @fown: the object the signal come from 1318 * @signum: unused 1319 * 1320 * Allow a privileged task to get signals even if it shouldn't 1321 * 1322 * Returns 0 if a subject with the object's smack could 1323 * write to the task, an error code otherwise. 1324 */ 1325 static int smack_file_send_sigiotask(struct task_struct *tsk, 1326 struct fown_struct *fown, int signum) 1327 { 1328 struct smack_known *skp; 1329 struct smack_known *tkp = smk_of_task(tsk->cred->security); 1330 struct file *file; 1331 int rc; 1332 struct smk_audit_info ad; 1333 1334 /* 1335 * struct fown_struct is never outside the context of a struct file 1336 */ 1337 file = container_of(fown, struct file, f_owner); 1338 1339 /* we don't log here as rc can be overriden */ 1340 skp = smk_find_entry(file->f_security); 1341 rc = smk_access(skp, tkp->smk_known, MAY_WRITE, NULL); 1342 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) 1343 rc = 0; 1344 1345 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 1346 smk_ad_setfield_u_tsk(&ad, tsk); 1347 smack_log(file->f_security, tkp->smk_known, MAY_WRITE, rc, &ad); 1348 return rc; 1349 } 1350 1351 /** 1352 * smack_file_receive - Smack file receive check 1353 * @file: the object 1354 * 1355 * Returns 0 if current has access, error code otherwise 1356 */ 1357 static int smack_file_receive(struct file *file) 1358 { 1359 int may = 0; 1360 struct smk_audit_info ad; 1361 1362 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 1363 smk_ad_setfield_u_fs_path(&ad, file->f_path); 1364 /* 1365 * This code relies on bitmasks. 1366 */ 1367 if (file->f_mode & FMODE_READ) 1368 may = MAY_READ; 1369 if (file->f_mode & FMODE_WRITE) 1370 may |= MAY_WRITE; 1371 1372 return smk_curacc(file->f_security, may, &ad); 1373 } 1374 1375 /** 1376 * smack_file_open - Smack dentry open processing 1377 * @file: the object 1378 * @cred: unused 1379 * 1380 * Set the security blob in the file structure. 1381 * 1382 * Returns 0 1383 */ 1384 static int smack_file_open(struct file *file, const struct cred *cred) 1385 { 1386 struct inode_smack *isp = file_inode(file)->i_security; 1387 1388 file->f_security = isp->smk_inode; 1389 1390 return 0; 1391 } 1392 1393 /* 1394 * Task hooks 1395 */ 1396 1397 /** 1398 * smack_cred_alloc_blank - "allocate" blank task-level security credentials 1399 * @new: the new credentials 1400 * @gfp: the atomicity of any memory allocations 1401 * 1402 * Prepare a blank set of credentials for modification. This must allocate all 1403 * the memory the LSM module might require such that cred_transfer() can 1404 * complete without error. 1405 */ 1406 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) 1407 { 1408 struct task_smack *tsp; 1409 1410 tsp = new_task_smack(NULL, NULL, gfp); 1411 if (tsp == NULL) 1412 return -ENOMEM; 1413 1414 cred->security = tsp; 1415 1416 return 0; 1417 } 1418 1419 1420 /** 1421 * smack_cred_free - "free" task-level security credentials 1422 * @cred: the credentials in question 1423 * 1424 */ 1425 static void smack_cred_free(struct cred *cred) 1426 { 1427 struct task_smack *tsp = cred->security; 1428 struct smack_rule *rp; 1429 struct list_head *l; 1430 struct list_head *n; 1431 1432 if (tsp == NULL) 1433 return; 1434 cred->security = NULL; 1435 1436 list_for_each_safe(l, n, &tsp->smk_rules) { 1437 rp = list_entry(l, struct smack_rule, list); 1438 list_del(&rp->list); 1439 kfree(rp); 1440 } 1441 kfree(tsp); 1442 } 1443 1444 /** 1445 * smack_cred_prepare - prepare new set of credentials for modification 1446 * @new: the new credentials 1447 * @old: the original credentials 1448 * @gfp: the atomicity of any memory allocations 1449 * 1450 * Prepare a new set of credentials for modification. 1451 */ 1452 static int smack_cred_prepare(struct cred *new, const struct cred *old, 1453 gfp_t gfp) 1454 { 1455 struct task_smack *old_tsp = old->security; 1456 struct task_smack *new_tsp; 1457 int rc; 1458 1459 new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); 1460 if (new_tsp == NULL) 1461 return -ENOMEM; 1462 1463 rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); 1464 if (rc != 0) 1465 return rc; 1466 1467 new->security = new_tsp; 1468 return 0; 1469 } 1470 1471 /** 1472 * smack_cred_transfer - Transfer the old credentials to the new credentials 1473 * @new: the new credentials 1474 * @old: the original credentials 1475 * 1476 * Fill in a set of blank credentials from another set of credentials. 1477 */ 1478 static void smack_cred_transfer(struct cred *new, const struct cred *old) 1479 { 1480 struct task_smack *old_tsp = old->security; 1481 struct task_smack *new_tsp = new->security; 1482 1483 new_tsp->smk_task = old_tsp->smk_task; 1484 new_tsp->smk_forked = old_tsp->smk_task; 1485 mutex_init(&new_tsp->smk_rules_lock); 1486 INIT_LIST_HEAD(&new_tsp->smk_rules); 1487 1488 1489 /* cbs copy rule list */ 1490 } 1491 1492 /** 1493 * smack_kernel_act_as - Set the subjective context in a set of credentials 1494 * @new: points to the set of credentials to be modified. 1495 * @secid: specifies the security ID to be set 1496 * 1497 * Set the security data for a kernel service. 1498 */ 1499 static int smack_kernel_act_as(struct cred *new, u32 secid) 1500 { 1501 struct task_smack *new_tsp = new->security; 1502 struct smack_known *skp = smack_from_secid(secid); 1503 1504 if (skp == NULL) 1505 return -EINVAL; 1506 1507 new_tsp->smk_task = skp; 1508 return 0; 1509 } 1510 1511 /** 1512 * smack_kernel_create_files_as - Set the file creation label in a set of creds 1513 * @new: points to the set of credentials to be modified 1514 * @inode: points to the inode to use as a reference 1515 * 1516 * Set the file creation context in a set of credentials to the same 1517 * as the objective context of the specified inode 1518 */ 1519 static int smack_kernel_create_files_as(struct cred *new, 1520 struct inode *inode) 1521 { 1522 struct inode_smack *isp = inode->i_security; 1523 struct task_smack *tsp = new->security; 1524 1525 tsp->smk_forked = smk_find_entry(isp->smk_inode); 1526 tsp->smk_task = tsp->smk_forked; 1527 return 0; 1528 } 1529 1530 /** 1531 * smk_curacc_on_task - helper to log task related access 1532 * @p: the task object 1533 * @access: the access requested 1534 * @caller: name of the calling function for audit 1535 * 1536 * Return 0 if access is permitted 1537 */ 1538 static int smk_curacc_on_task(struct task_struct *p, int access, 1539 const char *caller) 1540 { 1541 struct smk_audit_info ad; 1542 struct smack_known *skp = smk_of_task(task_security(p)); 1543 1544 smk_ad_init(&ad, caller, LSM_AUDIT_DATA_TASK); 1545 smk_ad_setfield_u_tsk(&ad, p); 1546 return smk_curacc(skp->smk_known, access, &ad); 1547 } 1548 1549 /** 1550 * smack_task_setpgid - Smack check on setting pgid 1551 * @p: the task object 1552 * @pgid: unused 1553 * 1554 * Return 0 if write access is permitted 1555 */ 1556 static int smack_task_setpgid(struct task_struct *p, pid_t pgid) 1557 { 1558 return smk_curacc_on_task(p, MAY_WRITE, __func__); 1559 } 1560 1561 /** 1562 * smack_task_getpgid - Smack access check for getpgid 1563 * @p: the object task 1564 * 1565 * Returns 0 if current can read the object task, error code otherwise 1566 */ 1567 static int smack_task_getpgid(struct task_struct *p) 1568 { 1569 return smk_curacc_on_task(p, MAY_READ, __func__); 1570 } 1571 1572 /** 1573 * smack_task_getsid - Smack access check for getsid 1574 * @p: the object task 1575 * 1576 * Returns 0 if current can read the object task, error code otherwise 1577 */ 1578 static int smack_task_getsid(struct task_struct *p) 1579 { 1580 return smk_curacc_on_task(p, MAY_READ, __func__); 1581 } 1582 1583 /** 1584 * smack_task_getsecid - get the secid of the task 1585 * @p: the object task 1586 * @secid: where to put the result 1587 * 1588 * Sets the secid to contain a u32 version of the smack label. 1589 */ 1590 static void smack_task_getsecid(struct task_struct *p, u32 *secid) 1591 { 1592 struct smack_known *skp = smk_of_task(task_security(p)); 1593 1594 *secid = skp->smk_secid; 1595 } 1596 1597 /** 1598 * smack_task_setnice - Smack check on setting nice 1599 * @p: the task object 1600 * @nice: unused 1601 * 1602 * Return 0 if write access is permitted 1603 */ 1604 static int smack_task_setnice(struct task_struct *p, int nice) 1605 { 1606 int rc; 1607 1608 rc = cap_task_setnice(p, nice); 1609 if (rc == 0) 1610 rc = smk_curacc_on_task(p, MAY_WRITE, __func__); 1611 return rc; 1612 } 1613 1614 /** 1615 * smack_task_setioprio - Smack check on setting ioprio 1616 * @p: the task object 1617 * @ioprio: unused 1618 * 1619 * Return 0 if write access is permitted 1620 */ 1621 static int smack_task_setioprio(struct task_struct *p, int ioprio) 1622 { 1623 int rc; 1624 1625 rc = cap_task_setioprio(p, ioprio); 1626 if (rc == 0) 1627 rc = smk_curacc_on_task(p, MAY_WRITE, __func__); 1628 return rc; 1629 } 1630 1631 /** 1632 * smack_task_getioprio - Smack check on reading ioprio 1633 * @p: the task object 1634 * 1635 * Return 0 if read access is permitted 1636 */ 1637 static int smack_task_getioprio(struct task_struct *p) 1638 { 1639 return smk_curacc_on_task(p, MAY_READ, __func__); 1640 } 1641 1642 /** 1643 * smack_task_setscheduler - Smack check on setting scheduler 1644 * @p: the task object 1645 * @policy: unused 1646 * @lp: unused 1647 * 1648 * Return 0 if read access is permitted 1649 */ 1650 static int smack_task_setscheduler(struct task_struct *p) 1651 { 1652 int rc; 1653 1654 rc = cap_task_setscheduler(p); 1655 if (rc == 0) 1656 rc = smk_curacc_on_task(p, MAY_WRITE, __func__); 1657 return rc; 1658 } 1659 1660 /** 1661 * smack_task_getscheduler - Smack check on reading scheduler 1662 * @p: the task object 1663 * 1664 * Return 0 if read access is permitted 1665 */ 1666 static int smack_task_getscheduler(struct task_struct *p) 1667 { 1668 return smk_curacc_on_task(p, MAY_READ, __func__); 1669 } 1670 1671 /** 1672 * smack_task_movememory - Smack check on moving memory 1673 * @p: the task object 1674 * 1675 * Return 0 if write access is permitted 1676 */ 1677 static int smack_task_movememory(struct task_struct *p) 1678 { 1679 return smk_curacc_on_task(p, MAY_WRITE, __func__); 1680 } 1681 1682 /** 1683 * smack_task_kill - Smack check on signal delivery 1684 * @p: the task object 1685 * @info: unused 1686 * @sig: unused 1687 * @secid: identifies the smack to use in lieu of current's 1688 * 1689 * Return 0 if write access is permitted 1690 * 1691 * The secid behavior is an artifact of an SELinux hack 1692 * in the USB code. Someday it may go away. 1693 */ 1694 static int smack_task_kill(struct task_struct *p, struct siginfo *info, 1695 int sig, u32 secid) 1696 { 1697 struct smk_audit_info ad; 1698 struct smack_known *skp; 1699 struct smack_known *tkp = smk_of_task(task_security(p)); 1700 1701 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 1702 smk_ad_setfield_u_tsk(&ad, p); 1703 /* 1704 * Sending a signal requires that the sender 1705 * can write the receiver. 1706 */ 1707 if (secid == 0) 1708 return smk_curacc(tkp->smk_known, MAY_WRITE, &ad); 1709 /* 1710 * If the secid isn't 0 we're dealing with some USB IO 1711 * specific behavior. This is not clean. For one thing 1712 * we can't take privilege into account. 1713 */ 1714 skp = smack_from_secid(secid); 1715 return smk_access(skp, tkp->smk_known, MAY_WRITE, &ad); 1716 } 1717 1718 /** 1719 * smack_task_wait - Smack access check for waiting 1720 * @p: task to wait for 1721 * 1722 * Returns 0 1723 */ 1724 static int smack_task_wait(struct task_struct *p) 1725 { 1726 /* 1727 * Allow the operation to succeed. 1728 * Zombies are bad. 1729 * In userless environments (e.g. phones) programs 1730 * get marked with SMACK64EXEC and even if the parent 1731 * and child shouldn't be talking the parent still 1732 * may expect to know when the child exits. 1733 */ 1734 return 0; 1735 } 1736 1737 /** 1738 * smack_task_to_inode - copy task smack into the inode blob 1739 * @p: task to copy from 1740 * @inode: inode to copy to 1741 * 1742 * Sets the smack pointer in the inode security blob 1743 */ 1744 static void smack_task_to_inode(struct task_struct *p, struct inode *inode) 1745 { 1746 struct inode_smack *isp = inode->i_security; 1747 struct smack_known *skp = smk_of_task(task_security(p)); 1748 1749 isp->smk_inode = skp->smk_known; 1750 } 1751 1752 /* 1753 * Socket hooks. 1754 */ 1755 1756 /** 1757 * smack_sk_alloc_security - Allocate a socket blob 1758 * @sk: the socket 1759 * @family: unused 1760 * @gfp_flags: memory allocation flags 1761 * 1762 * Assign Smack pointers to current 1763 * 1764 * Returns 0 on success, -ENOMEM is there's no memory 1765 */ 1766 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) 1767 { 1768 struct smack_known *skp = smk_of_current(); 1769 struct socket_smack *ssp; 1770 1771 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); 1772 if (ssp == NULL) 1773 return -ENOMEM; 1774 1775 ssp->smk_in = skp->smk_known; 1776 ssp->smk_out = skp; 1777 ssp->smk_packet = NULL; 1778 1779 sk->sk_security = ssp; 1780 1781 return 0; 1782 } 1783 1784 /** 1785 * smack_sk_free_security - Free a socket blob 1786 * @sk: the socket 1787 * 1788 * Clears the blob pointer 1789 */ 1790 static void smack_sk_free_security(struct sock *sk) 1791 { 1792 kfree(sk->sk_security); 1793 } 1794 1795 /** 1796 * smack_host_label - check host based restrictions 1797 * @sip: the object end 1798 * 1799 * looks for host based access restrictions 1800 * 1801 * This version will only be appropriate for really small sets of single label 1802 * hosts. The caller is responsible for ensuring that the RCU read lock is 1803 * taken before calling this function. 1804 * 1805 * Returns the label of the far end or NULL if it's not special. 1806 */ 1807 static char *smack_host_label(struct sockaddr_in *sip) 1808 { 1809 struct smk_netlbladdr *snp; 1810 struct in_addr *siap = &sip->sin_addr; 1811 1812 if (siap->s_addr == 0) 1813 return NULL; 1814 1815 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) 1816 /* 1817 * we break after finding the first match because 1818 * the list is sorted from longest to shortest mask 1819 * so we have found the most specific match 1820 */ 1821 if ((&snp->smk_host.sin_addr)->s_addr == 1822 (siap->s_addr & (&snp->smk_mask)->s_addr)) { 1823 /* we have found the special CIPSO option */ 1824 if (snp->smk_label == smack_cipso_option) 1825 return NULL; 1826 return snp->smk_label; 1827 } 1828 1829 return NULL; 1830 } 1831 1832 /** 1833 * smack_netlabel - Set the secattr on a socket 1834 * @sk: the socket 1835 * @labeled: socket label scheme 1836 * 1837 * Convert the outbound smack value (smk_out) to a 1838 * secattr and attach it to the socket. 1839 * 1840 * Returns 0 on success or an error code 1841 */ 1842 static int smack_netlabel(struct sock *sk, int labeled) 1843 { 1844 struct smack_known *skp; 1845 struct socket_smack *ssp = sk->sk_security; 1846 int rc = 0; 1847 1848 /* 1849 * Usually the netlabel code will handle changing the 1850 * packet labeling based on the label. 1851 * The case of a single label host is different, because 1852 * a single label host should never get a labeled packet 1853 * even though the label is usually associated with a packet 1854 * label. 1855 */ 1856 local_bh_disable(); 1857 bh_lock_sock_nested(sk); 1858 1859 if (ssp->smk_out == smack_net_ambient || 1860 labeled == SMACK_UNLABELED_SOCKET) 1861 netlbl_sock_delattr(sk); 1862 else { 1863 skp = ssp->smk_out; 1864 rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel); 1865 } 1866 1867 bh_unlock_sock(sk); 1868 local_bh_enable(); 1869 1870 return rc; 1871 } 1872 1873 /** 1874 * smack_netlbel_send - Set the secattr on a socket and perform access checks 1875 * @sk: the socket 1876 * @sap: the destination address 1877 * 1878 * Set the correct secattr for the given socket based on the destination 1879 * address and perform any outbound access checks needed. 1880 * 1881 * Returns 0 on success or an error code. 1882 * 1883 */ 1884 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) 1885 { 1886 struct smack_known *skp; 1887 int rc; 1888 int sk_lbl; 1889 char *hostsp; 1890 struct socket_smack *ssp = sk->sk_security; 1891 struct smk_audit_info ad; 1892 1893 rcu_read_lock(); 1894 hostsp = smack_host_label(sap); 1895 if (hostsp != NULL) { 1896 #ifdef CONFIG_AUDIT 1897 struct lsm_network_audit net; 1898 1899 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); 1900 ad.a.u.net->family = sap->sin_family; 1901 ad.a.u.net->dport = sap->sin_port; 1902 ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr; 1903 #endif 1904 sk_lbl = SMACK_UNLABELED_SOCKET; 1905 skp = ssp->smk_out; 1906 rc = smk_access(skp, hostsp, MAY_WRITE, &ad); 1907 } else { 1908 sk_lbl = SMACK_CIPSO_SOCKET; 1909 rc = 0; 1910 } 1911 rcu_read_unlock(); 1912 if (rc != 0) 1913 return rc; 1914 1915 return smack_netlabel(sk, sk_lbl); 1916 } 1917 1918 /** 1919 * smk_ipv6_port_label - Smack port access table management 1920 * @sock: socket 1921 * @address: address 1922 * 1923 * Create or update the port list entry 1924 */ 1925 static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address) 1926 { 1927 struct sock *sk = sock->sk; 1928 struct sockaddr_in6 *addr6; 1929 struct socket_smack *ssp = sock->sk->sk_security; 1930 struct smk_port_label *spp; 1931 unsigned short port = 0; 1932 1933 if (address == NULL) { 1934 /* 1935 * This operation is changing the Smack information 1936 * on the bound socket. Take the changes to the port 1937 * as well. 1938 */ 1939 list_for_each_entry(spp, &smk_ipv6_port_list, list) { 1940 if (sk != spp->smk_sock) 1941 continue; 1942 spp->smk_in = ssp->smk_in; 1943 spp->smk_out = ssp->smk_out; 1944 return; 1945 } 1946 /* 1947 * A NULL address is only used for updating existing 1948 * bound entries. If there isn't one, it's OK. 1949 */ 1950 return; 1951 } 1952 1953 addr6 = (struct sockaddr_in6 *)address; 1954 port = ntohs(addr6->sin6_port); 1955 /* 1956 * This is a special case that is safely ignored. 1957 */ 1958 if (port == 0) 1959 return; 1960 1961 /* 1962 * Look for an existing port list entry. 1963 * This is an indication that a port is getting reused. 1964 */ 1965 list_for_each_entry(spp, &smk_ipv6_port_list, list) { 1966 if (spp->smk_port != port) 1967 continue; 1968 spp->smk_port = port; 1969 spp->smk_sock = sk; 1970 spp->smk_in = ssp->smk_in; 1971 spp->smk_out = ssp->smk_out; 1972 return; 1973 } 1974 1975 /* 1976 * A new port entry is required. 1977 */ 1978 spp = kzalloc(sizeof(*spp), GFP_KERNEL); 1979 if (spp == NULL) 1980 return; 1981 1982 spp->smk_port = port; 1983 spp->smk_sock = sk; 1984 spp->smk_in = ssp->smk_in; 1985 spp->smk_out = ssp->smk_out; 1986 1987 list_add(&spp->list, &smk_ipv6_port_list); 1988 return; 1989 } 1990 1991 /** 1992 * smk_ipv6_port_check - check Smack port access 1993 * @sock: socket 1994 * @address: address 1995 * 1996 * Create or update the port list entry 1997 */ 1998 static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address, 1999 int act) 2000 { 2001 __be16 *bep; 2002 __be32 *be32p; 2003 struct smk_port_label *spp; 2004 struct socket_smack *ssp = sk->sk_security; 2005 struct smack_known *skp; 2006 unsigned short port = 0; 2007 char *object; 2008 struct smk_audit_info ad; 2009 #ifdef CONFIG_AUDIT 2010 struct lsm_network_audit net; 2011 #endif 2012 2013 if (act == SMK_RECEIVING) { 2014 skp = smack_net_ambient; 2015 object = ssp->smk_in; 2016 } else { 2017 skp = ssp->smk_out; 2018 object = smack_net_ambient->smk_known; 2019 } 2020 2021 /* 2022 * Get the IP address and port from the address. 2023 */ 2024 port = ntohs(address->sin6_port); 2025 bep = (__be16 *)(&address->sin6_addr); 2026 be32p = (__be32 *)(&address->sin6_addr); 2027 2028 /* 2029 * It's remote, so port lookup does no good. 2030 */ 2031 if (be32p[0] || be32p[1] || be32p[2] || bep[6] || ntohs(bep[7]) != 1) 2032 goto auditout; 2033 2034 /* 2035 * It's local so the send check has to have passed. 2036 */ 2037 if (act == SMK_RECEIVING) { 2038 skp = &smack_known_web; 2039 goto auditout; 2040 } 2041 2042 list_for_each_entry(spp, &smk_ipv6_port_list, list) { 2043 if (spp->smk_port != port) 2044 continue; 2045 object = spp->smk_in; 2046 if (act == SMK_CONNECTING) 2047 ssp->smk_packet = spp->smk_out->smk_known; 2048 break; 2049 } 2050 2051 auditout: 2052 2053 #ifdef CONFIG_AUDIT 2054 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); 2055 ad.a.u.net->family = sk->sk_family; 2056 ad.a.u.net->dport = port; 2057 if (act == SMK_RECEIVING) 2058 ad.a.u.net->v6info.saddr = address->sin6_addr; 2059 else 2060 ad.a.u.net->v6info.daddr = address->sin6_addr; 2061 #endif 2062 return smk_access(skp, object, MAY_WRITE, &ad); 2063 } 2064 2065 /** 2066 * smack_inode_setsecurity - set smack xattrs 2067 * @inode: the object 2068 * @name: attribute name 2069 * @value: attribute value 2070 * @size: size of the attribute 2071 * @flags: unused 2072 * 2073 * Sets the named attribute in the appropriate blob 2074 * 2075 * Returns 0 on success, or an error code 2076 */ 2077 static int smack_inode_setsecurity(struct inode *inode, const char *name, 2078 const void *value, size_t size, int flags) 2079 { 2080 struct smack_known *skp; 2081 struct inode_smack *nsp = inode->i_security; 2082 struct socket_smack *ssp; 2083 struct socket *sock; 2084 int rc = 0; 2085 2086 if (value == NULL || size > SMK_LONGLABEL || size == 0) 2087 return -EACCES; 2088 2089 skp = smk_import_entry(value, size); 2090 if (skp == NULL) 2091 return -EINVAL; 2092 2093 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { 2094 nsp->smk_inode = skp->smk_known; 2095 nsp->smk_flags |= SMK_INODE_INSTANT; 2096 return 0; 2097 } 2098 /* 2099 * The rest of the Smack xattrs are only on sockets. 2100 */ 2101 if (inode->i_sb->s_magic != SOCKFS_MAGIC) 2102 return -EOPNOTSUPP; 2103 2104 sock = SOCKET_I(inode); 2105 if (sock == NULL || sock->sk == NULL) 2106 return -EOPNOTSUPP; 2107 2108 ssp = sock->sk->sk_security; 2109 2110 if (strcmp(name, XATTR_SMACK_IPIN) == 0) 2111 ssp->smk_in = skp->smk_known; 2112 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { 2113 ssp->smk_out = skp; 2114 if (sock->sk->sk_family == PF_INET) { 2115 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); 2116 if (rc != 0) 2117 printk(KERN_WARNING 2118 "Smack: \"%s\" netlbl error %d.\n", 2119 __func__, -rc); 2120 } 2121 } else 2122 return -EOPNOTSUPP; 2123 2124 if (sock->sk->sk_family == PF_INET6) 2125 smk_ipv6_port_label(sock, NULL); 2126 2127 return 0; 2128 } 2129 2130 /** 2131 * smack_socket_post_create - finish socket setup 2132 * @sock: the socket 2133 * @family: protocol family 2134 * @type: unused 2135 * @protocol: unused 2136 * @kern: unused 2137 * 2138 * Sets the netlabel information on the socket 2139 * 2140 * Returns 0 on success, and error code otherwise 2141 */ 2142 static int smack_socket_post_create(struct socket *sock, int family, 2143 int type, int protocol, int kern) 2144 { 2145 if (family != PF_INET || sock->sk == NULL) 2146 return 0; 2147 /* 2148 * Set the outbound netlbl. 2149 */ 2150 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); 2151 } 2152 2153 /** 2154 * smack_socket_bind - record port binding information. 2155 * @sock: the socket 2156 * @address: the port address 2157 * @addrlen: size of the address 2158 * 2159 * Records the label bound to a port. 2160 * 2161 * Returns 0 2162 */ 2163 static int smack_socket_bind(struct socket *sock, struct sockaddr *address, 2164 int addrlen) 2165 { 2166 if (sock->sk != NULL && sock->sk->sk_family == PF_INET6) 2167 smk_ipv6_port_label(sock, address); 2168 2169 return 0; 2170 } 2171 2172 /** 2173 * smack_socket_connect - connect access check 2174 * @sock: the socket 2175 * @sap: the other end 2176 * @addrlen: size of sap 2177 * 2178 * Verifies that a connection may be possible 2179 * 2180 * Returns 0 on success, and error code otherwise 2181 */ 2182 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, 2183 int addrlen) 2184 { 2185 int rc = 0; 2186 2187 if (sock->sk == NULL) 2188 return 0; 2189 2190 switch (sock->sk->sk_family) { 2191 case PF_INET: 2192 if (addrlen < sizeof(struct sockaddr_in)) 2193 return -EINVAL; 2194 rc = smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); 2195 break; 2196 case PF_INET6: 2197 if (addrlen < sizeof(struct sockaddr_in6)) 2198 return -EINVAL; 2199 rc = smk_ipv6_port_check(sock->sk, (struct sockaddr_in6 *)sap, 2200 SMK_CONNECTING); 2201 break; 2202 } 2203 return rc; 2204 } 2205 2206 /** 2207 * smack_flags_to_may - convert S_ to MAY_ values 2208 * @flags: the S_ value 2209 * 2210 * Returns the equivalent MAY_ value 2211 */ 2212 static int smack_flags_to_may(int flags) 2213 { 2214 int may = 0; 2215 2216 if (flags & S_IRUGO) 2217 may |= MAY_READ; 2218 if (flags & S_IWUGO) 2219 may |= MAY_WRITE; 2220 if (flags & S_IXUGO) 2221 may |= MAY_EXEC; 2222 2223 return may; 2224 } 2225 2226 /** 2227 * smack_msg_msg_alloc_security - Set the security blob for msg_msg 2228 * @msg: the object 2229 * 2230 * Returns 0 2231 */ 2232 static int smack_msg_msg_alloc_security(struct msg_msg *msg) 2233 { 2234 struct smack_known *skp = smk_of_current(); 2235 2236 msg->security = skp->smk_known; 2237 return 0; 2238 } 2239 2240 /** 2241 * smack_msg_msg_free_security - Clear the security blob for msg_msg 2242 * @msg: the object 2243 * 2244 * Clears the blob pointer 2245 */ 2246 static void smack_msg_msg_free_security(struct msg_msg *msg) 2247 { 2248 msg->security = NULL; 2249 } 2250 2251 /** 2252 * smack_of_shm - the smack pointer for the shm 2253 * @shp: the object 2254 * 2255 * Returns a pointer to the smack value 2256 */ 2257 static char *smack_of_shm(struct shmid_kernel *shp) 2258 { 2259 return (char *)shp->shm_perm.security; 2260 } 2261 2262 /** 2263 * smack_shm_alloc_security - Set the security blob for shm 2264 * @shp: the object 2265 * 2266 * Returns 0 2267 */ 2268 static int smack_shm_alloc_security(struct shmid_kernel *shp) 2269 { 2270 struct kern_ipc_perm *isp = &shp->shm_perm; 2271 struct smack_known *skp = smk_of_current(); 2272 2273 isp->security = skp->smk_known; 2274 return 0; 2275 } 2276 2277 /** 2278 * smack_shm_free_security - Clear the security blob for shm 2279 * @shp: the object 2280 * 2281 * Clears the blob pointer 2282 */ 2283 static void smack_shm_free_security(struct shmid_kernel *shp) 2284 { 2285 struct kern_ipc_perm *isp = &shp->shm_perm; 2286 2287 isp->security = NULL; 2288 } 2289 2290 /** 2291 * smk_curacc_shm : check if current has access on shm 2292 * @shp : the object 2293 * @access : access requested 2294 * 2295 * Returns 0 if current has the requested access, error code otherwise 2296 */ 2297 static int smk_curacc_shm(struct shmid_kernel *shp, int access) 2298 { 2299 char *ssp = smack_of_shm(shp); 2300 struct smk_audit_info ad; 2301 2302 #ifdef CONFIG_AUDIT 2303 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); 2304 ad.a.u.ipc_id = shp->shm_perm.id; 2305 #endif 2306 return smk_curacc(ssp, access, &ad); 2307 } 2308 2309 /** 2310 * smack_shm_associate - Smack access check for shm 2311 * @shp: the object 2312 * @shmflg: access requested 2313 * 2314 * Returns 0 if current has the requested access, error code otherwise 2315 */ 2316 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) 2317 { 2318 int may; 2319 2320 may = smack_flags_to_may(shmflg); 2321 return smk_curacc_shm(shp, may); 2322 } 2323 2324 /** 2325 * smack_shm_shmctl - Smack access check for shm 2326 * @shp: the object 2327 * @cmd: what it wants to do 2328 * 2329 * Returns 0 if current has the requested access, error code otherwise 2330 */ 2331 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) 2332 { 2333 int may; 2334 2335 switch (cmd) { 2336 case IPC_STAT: 2337 case SHM_STAT: 2338 may = MAY_READ; 2339 break; 2340 case IPC_SET: 2341 case SHM_LOCK: 2342 case SHM_UNLOCK: 2343 case IPC_RMID: 2344 may = MAY_READWRITE; 2345 break; 2346 case IPC_INFO: 2347 case SHM_INFO: 2348 /* 2349 * System level information. 2350 */ 2351 return 0; 2352 default: 2353 return -EINVAL; 2354 } 2355 return smk_curacc_shm(shp, may); 2356 } 2357 2358 /** 2359 * smack_shm_shmat - Smack access for shmat 2360 * @shp: the object 2361 * @shmaddr: unused 2362 * @shmflg: access requested 2363 * 2364 * Returns 0 if current has the requested access, error code otherwise 2365 */ 2366 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, 2367 int shmflg) 2368 { 2369 int may; 2370 2371 may = smack_flags_to_may(shmflg); 2372 return smk_curacc_shm(shp, may); 2373 } 2374 2375 /** 2376 * smack_of_sem - the smack pointer for the sem 2377 * @sma: the object 2378 * 2379 * Returns a pointer to the smack value 2380 */ 2381 static char *smack_of_sem(struct sem_array *sma) 2382 { 2383 return (char *)sma->sem_perm.security; 2384 } 2385 2386 /** 2387 * smack_sem_alloc_security - Set the security blob for sem 2388 * @sma: the object 2389 * 2390 * Returns 0 2391 */ 2392 static int smack_sem_alloc_security(struct sem_array *sma) 2393 { 2394 struct kern_ipc_perm *isp = &sma->sem_perm; 2395 struct smack_known *skp = smk_of_current(); 2396 2397 isp->security = skp->smk_known; 2398 return 0; 2399 } 2400 2401 /** 2402 * smack_sem_free_security - Clear the security blob for sem 2403 * @sma: the object 2404 * 2405 * Clears the blob pointer 2406 */ 2407 static void smack_sem_free_security(struct sem_array *sma) 2408 { 2409 struct kern_ipc_perm *isp = &sma->sem_perm; 2410 2411 isp->security = NULL; 2412 } 2413 2414 /** 2415 * smk_curacc_sem : check if current has access on sem 2416 * @sma : the object 2417 * @access : access requested 2418 * 2419 * Returns 0 if current has the requested access, error code otherwise 2420 */ 2421 static int smk_curacc_sem(struct sem_array *sma, int access) 2422 { 2423 char *ssp = smack_of_sem(sma); 2424 struct smk_audit_info ad; 2425 2426 #ifdef CONFIG_AUDIT 2427 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); 2428 ad.a.u.ipc_id = sma->sem_perm.id; 2429 #endif 2430 return smk_curacc(ssp, access, &ad); 2431 } 2432 2433 /** 2434 * smack_sem_associate - Smack access check for sem 2435 * @sma: the object 2436 * @semflg: access requested 2437 * 2438 * Returns 0 if current has the requested access, error code otherwise 2439 */ 2440 static int smack_sem_associate(struct sem_array *sma, int semflg) 2441 { 2442 int may; 2443 2444 may = smack_flags_to_may(semflg); 2445 return smk_curacc_sem(sma, may); 2446 } 2447 2448 /** 2449 * smack_sem_shmctl - Smack access check for sem 2450 * @sma: the object 2451 * @cmd: what it wants to do 2452 * 2453 * Returns 0 if current has the requested access, error code otherwise 2454 */ 2455 static int smack_sem_semctl(struct sem_array *sma, int cmd) 2456 { 2457 int may; 2458 2459 switch (cmd) { 2460 case GETPID: 2461 case GETNCNT: 2462 case GETZCNT: 2463 case GETVAL: 2464 case GETALL: 2465 case IPC_STAT: 2466 case SEM_STAT: 2467 may = MAY_READ; 2468 break; 2469 case SETVAL: 2470 case SETALL: 2471 case IPC_RMID: 2472 case IPC_SET: 2473 may = MAY_READWRITE; 2474 break; 2475 case IPC_INFO: 2476 case SEM_INFO: 2477 /* 2478 * System level information 2479 */ 2480 return 0; 2481 default: 2482 return -EINVAL; 2483 } 2484 2485 return smk_curacc_sem(sma, may); 2486 } 2487 2488 /** 2489 * smack_sem_semop - Smack checks of semaphore operations 2490 * @sma: the object 2491 * @sops: unused 2492 * @nsops: unused 2493 * @alter: unused 2494 * 2495 * Treated as read and write in all cases. 2496 * 2497 * Returns 0 if access is allowed, error code otherwise 2498 */ 2499 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, 2500 unsigned nsops, int alter) 2501 { 2502 return smk_curacc_sem(sma, MAY_READWRITE); 2503 } 2504 2505 /** 2506 * smack_msg_alloc_security - Set the security blob for msg 2507 * @msq: the object 2508 * 2509 * Returns 0 2510 */ 2511 static int smack_msg_queue_alloc_security(struct msg_queue *msq) 2512 { 2513 struct kern_ipc_perm *kisp = &msq->q_perm; 2514 struct smack_known *skp = smk_of_current(); 2515 2516 kisp->security = skp->smk_known; 2517 return 0; 2518 } 2519 2520 /** 2521 * smack_msg_free_security - Clear the security blob for msg 2522 * @msq: the object 2523 * 2524 * Clears the blob pointer 2525 */ 2526 static void smack_msg_queue_free_security(struct msg_queue *msq) 2527 { 2528 struct kern_ipc_perm *kisp = &msq->q_perm; 2529 2530 kisp->security = NULL; 2531 } 2532 2533 /** 2534 * smack_of_msq - the smack pointer for the msq 2535 * @msq: the object 2536 * 2537 * Returns a pointer to the smack value 2538 */ 2539 static char *smack_of_msq(struct msg_queue *msq) 2540 { 2541 return (char *)msq->q_perm.security; 2542 } 2543 2544 /** 2545 * smk_curacc_msq : helper to check if current has access on msq 2546 * @msq : the msq 2547 * @access : access requested 2548 * 2549 * return 0 if current has access, error otherwise 2550 */ 2551 static int smk_curacc_msq(struct msg_queue *msq, int access) 2552 { 2553 char *msp = smack_of_msq(msq); 2554 struct smk_audit_info ad; 2555 2556 #ifdef CONFIG_AUDIT 2557 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); 2558 ad.a.u.ipc_id = msq->q_perm.id; 2559 #endif 2560 return smk_curacc(msp, access, &ad); 2561 } 2562 2563 /** 2564 * smack_msg_queue_associate - Smack access check for msg_queue 2565 * @msq: the object 2566 * @msqflg: access requested 2567 * 2568 * Returns 0 if current has the requested access, error code otherwise 2569 */ 2570 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) 2571 { 2572 int may; 2573 2574 may = smack_flags_to_may(msqflg); 2575 return smk_curacc_msq(msq, may); 2576 } 2577 2578 /** 2579 * smack_msg_queue_msgctl - Smack access check for msg_queue 2580 * @msq: the object 2581 * @cmd: what it wants to do 2582 * 2583 * Returns 0 if current has the requested access, error code otherwise 2584 */ 2585 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) 2586 { 2587 int may; 2588 2589 switch (cmd) { 2590 case IPC_STAT: 2591 case MSG_STAT: 2592 may = MAY_READ; 2593 break; 2594 case IPC_SET: 2595 case IPC_RMID: 2596 may = MAY_READWRITE; 2597 break; 2598 case IPC_INFO: 2599 case MSG_INFO: 2600 /* 2601 * System level information 2602 */ 2603 return 0; 2604 default: 2605 return -EINVAL; 2606 } 2607 2608 return smk_curacc_msq(msq, may); 2609 } 2610 2611 /** 2612 * smack_msg_queue_msgsnd - Smack access check for msg_queue 2613 * @msq: the object 2614 * @msg: unused 2615 * @msqflg: access requested 2616 * 2617 * Returns 0 if current has the requested access, error code otherwise 2618 */ 2619 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, 2620 int msqflg) 2621 { 2622 int may; 2623 2624 may = smack_flags_to_may(msqflg); 2625 return smk_curacc_msq(msq, may); 2626 } 2627 2628 /** 2629 * smack_msg_queue_msgsnd - Smack access check for msg_queue 2630 * @msq: the object 2631 * @msg: unused 2632 * @target: unused 2633 * @type: unused 2634 * @mode: unused 2635 * 2636 * Returns 0 if current has read and write access, error code otherwise 2637 */ 2638 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, 2639 struct task_struct *target, long type, int mode) 2640 { 2641 return smk_curacc_msq(msq, MAY_READWRITE); 2642 } 2643 2644 /** 2645 * smack_ipc_permission - Smack access for ipc_permission() 2646 * @ipp: the object permissions 2647 * @flag: access requested 2648 * 2649 * Returns 0 if current has read and write access, error code otherwise 2650 */ 2651 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) 2652 { 2653 char *isp = ipp->security; 2654 int may = smack_flags_to_may(flag); 2655 struct smk_audit_info ad; 2656 2657 #ifdef CONFIG_AUDIT 2658 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); 2659 ad.a.u.ipc_id = ipp->id; 2660 #endif 2661 return smk_curacc(isp, may, &ad); 2662 } 2663 2664 /** 2665 * smack_ipc_getsecid - Extract smack security id 2666 * @ipp: the object permissions 2667 * @secid: where result will be saved 2668 */ 2669 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) 2670 { 2671 char *smack = ipp->security; 2672 2673 *secid = smack_to_secid(smack); 2674 } 2675 2676 /** 2677 * smack_d_instantiate - Make sure the blob is correct on an inode 2678 * @opt_dentry: dentry where inode will be attached 2679 * @inode: the object 2680 * 2681 * Set the inode's security blob if it hasn't been done already. 2682 */ 2683 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) 2684 { 2685 struct super_block *sbp; 2686 struct superblock_smack *sbsp; 2687 struct inode_smack *isp; 2688 struct smack_known *skp; 2689 struct smack_known *ckp = smk_of_current(); 2690 char *final; 2691 char trattr[TRANS_TRUE_SIZE]; 2692 int transflag = 0; 2693 int rc; 2694 struct dentry *dp; 2695 2696 if (inode == NULL) 2697 return; 2698 2699 isp = inode->i_security; 2700 2701 mutex_lock(&isp->smk_lock); 2702 /* 2703 * If the inode is already instantiated 2704 * take the quick way out 2705 */ 2706 if (isp->smk_flags & SMK_INODE_INSTANT) 2707 goto unlockandout; 2708 2709 sbp = inode->i_sb; 2710 sbsp = sbp->s_security; 2711 /* 2712 * We're going to use the superblock default label 2713 * if there's no label on the file. 2714 */ 2715 final = sbsp->smk_default; 2716 2717 /* 2718 * If this is the root inode the superblock 2719 * may be in the process of initialization. 2720 * If that is the case use the root value out 2721 * of the superblock. 2722 */ 2723 if (opt_dentry->d_parent == opt_dentry) { 2724 isp->smk_inode = sbsp->smk_root; 2725 isp->smk_flags |= SMK_INODE_INSTANT; 2726 goto unlockandout; 2727 } 2728 2729 /* 2730 * This is pretty hackish. 2731 * Casey says that we shouldn't have to do 2732 * file system specific code, but it does help 2733 * with keeping it simple. 2734 */ 2735 switch (sbp->s_magic) { 2736 case SMACK_MAGIC: 2737 /* 2738 * Casey says that it's a little embarrassing 2739 * that the smack file system doesn't do 2740 * extended attributes. 2741 */ 2742 final = smack_known_star.smk_known; 2743 break; 2744 case PIPEFS_MAGIC: 2745 /* 2746 * Casey says pipes are easy (?) 2747 */ 2748 final = smack_known_star.smk_known; 2749 break; 2750 case DEVPTS_SUPER_MAGIC: 2751 /* 2752 * devpts seems content with the label of the task. 2753 * Programs that change smack have to treat the 2754 * pty with respect. 2755 */ 2756 final = ckp->smk_known; 2757 break; 2758 case SOCKFS_MAGIC: 2759 /* 2760 * Socket access is controlled by the socket 2761 * structures associated with the task involved. 2762 */ 2763 final = smack_known_star.smk_known; 2764 break; 2765 case PROC_SUPER_MAGIC: 2766 /* 2767 * Casey says procfs appears not to care. 2768 * The superblock default suffices. 2769 */ 2770 break; 2771 case TMPFS_MAGIC: 2772 /* 2773 * Device labels should come from the filesystem, 2774 * but watch out, because they're volitile, 2775 * getting recreated on every reboot. 2776 */ 2777 final = smack_known_star.smk_known; 2778 /* 2779 * No break. 2780 * 2781 * If a smack value has been set we want to use it, 2782 * but since tmpfs isn't giving us the opportunity 2783 * to set mount options simulate setting the 2784 * superblock default. 2785 */ 2786 default: 2787 /* 2788 * This isn't an understood special case. 2789 * Get the value from the xattr. 2790 */ 2791 2792 /* 2793 * UNIX domain sockets use lower level socket data. 2794 */ 2795 if (S_ISSOCK(inode->i_mode)) { 2796 final = smack_known_star.smk_known; 2797 break; 2798 } 2799 /* 2800 * No xattr support means, alas, no SMACK label. 2801 * Use the aforeapplied default. 2802 * It would be curious if the label of the task 2803 * does not match that assigned. 2804 */ 2805 if (inode->i_op->getxattr == NULL) 2806 break; 2807 /* 2808 * Get the dentry for xattr. 2809 */ 2810 dp = dget(opt_dentry); 2811 skp = smk_fetch(XATTR_NAME_SMACK, inode, dp); 2812 if (skp != NULL) 2813 final = skp->smk_known; 2814 2815 /* 2816 * Transmuting directory 2817 */ 2818 if (S_ISDIR(inode->i_mode)) { 2819 /* 2820 * If this is a new directory and the label was 2821 * transmuted when the inode was initialized 2822 * set the transmute attribute on the directory 2823 * and mark the inode. 2824 * 2825 * If there is a transmute attribute on the 2826 * directory mark the inode. 2827 */ 2828 if (isp->smk_flags & SMK_INODE_CHANGED) { 2829 isp->smk_flags &= ~SMK_INODE_CHANGED; 2830 rc = inode->i_op->setxattr(dp, 2831 XATTR_NAME_SMACKTRANSMUTE, 2832 TRANS_TRUE, TRANS_TRUE_SIZE, 2833 0); 2834 } else { 2835 rc = inode->i_op->getxattr(dp, 2836 XATTR_NAME_SMACKTRANSMUTE, trattr, 2837 TRANS_TRUE_SIZE); 2838 if (rc >= 0 && strncmp(trattr, TRANS_TRUE, 2839 TRANS_TRUE_SIZE) != 0) 2840 rc = -EINVAL; 2841 } 2842 if (rc >= 0) 2843 transflag = SMK_INODE_TRANSMUTE; 2844 } 2845 isp->smk_task = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp); 2846 isp->smk_mmap = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp); 2847 2848 dput(dp); 2849 break; 2850 } 2851 2852 if (final == NULL) 2853 isp->smk_inode = ckp->smk_known; 2854 else 2855 isp->smk_inode = final; 2856 2857 isp->smk_flags |= (SMK_INODE_INSTANT | transflag); 2858 2859 unlockandout: 2860 mutex_unlock(&isp->smk_lock); 2861 return; 2862 } 2863 2864 /** 2865 * smack_getprocattr - Smack process attribute access 2866 * @p: the object task 2867 * @name: the name of the attribute in /proc/.../attr 2868 * @value: where to put the result 2869 * 2870 * Places a copy of the task Smack into value 2871 * 2872 * Returns the length of the smack label or an error code 2873 */ 2874 static int smack_getprocattr(struct task_struct *p, char *name, char **value) 2875 { 2876 struct smack_known *skp = smk_of_task(task_security(p)); 2877 char *cp; 2878 int slen; 2879 2880 if (strcmp(name, "current") != 0) 2881 return -EINVAL; 2882 2883 cp = kstrdup(skp->smk_known, GFP_KERNEL); 2884 if (cp == NULL) 2885 return -ENOMEM; 2886 2887 slen = strlen(cp); 2888 *value = cp; 2889 return slen; 2890 } 2891 2892 /** 2893 * smack_setprocattr - Smack process attribute setting 2894 * @p: the object task 2895 * @name: the name of the attribute in /proc/.../attr 2896 * @value: the value to set 2897 * @size: the size of the value 2898 * 2899 * Sets the Smack value of the task. Only setting self 2900 * is permitted and only with privilege 2901 * 2902 * Returns the length of the smack label or an error code 2903 */ 2904 static int smack_setprocattr(struct task_struct *p, char *name, 2905 void *value, size_t size) 2906 { 2907 struct task_smack *tsp; 2908 struct cred *new; 2909 struct smack_known *skp; 2910 2911 /* 2912 * Changing another process' Smack value is too dangerous 2913 * and supports no sane use case. 2914 */ 2915 if (p != current) 2916 return -EPERM; 2917 2918 if (!smack_privileged(CAP_MAC_ADMIN)) 2919 return -EPERM; 2920 2921 if (value == NULL || size == 0 || size >= SMK_LONGLABEL) 2922 return -EINVAL; 2923 2924 if (strcmp(name, "current") != 0) 2925 return -EINVAL; 2926 2927 skp = smk_import_entry(value, size); 2928 if (skp == NULL) 2929 return -EINVAL; 2930 2931 /* 2932 * No process is ever allowed the web ("@") label. 2933 */ 2934 if (skp == &smack_known_web) 2935 return -EPERM; 2936 2937 new = prepare_creds(); 2938 if (new == NULL) 2939 return -ENOMEM; 2940 2941 tsp = new->security; 2942 tsp->smk_task = skp; 2943 2944 commit_creds(new); 2945 return size; 2946 } 2947 2948 /** 2949 * smack_unix_stream_connect - Smack access on UDS 2950 * @sock: one sock 2951 * @other: the other sock 2952 * @newsk: unused 2953 * 2954 * Return 0 if a subject with the smack of sock could access 2955 * an object with the smack of other, otherwise an error code 2956 */ 2957 static int smack_unix_stream_connect(struct sock *sock, 2958 struct sock *other, struct sock *newsk) 2959 { 2960 struct smack_known *skp; 2961 struct socket_smack *ssp = sock->sk_security; 2962 struct socket_smack *osp = other->sk_security; 2963 struct socket_smack *nsp = newsk->sk_security; 2964 struct smk_audit_info ad; 2965 int rc = 0; 2966 2967 #ifdef CONFIG_AUDIT 2968 struct lsm_network_audit net; 2969 2970 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); 2971 smk_ad_setfield_u_net_sk(&ad, other); 2972 #endif 2973 2974 if (!smack_privileged(CAP_MAC_OVERRIDE)) { 2975 skp = ssp->smk_out; 2976 rc = smk_access(skp, osp->smk_in, MAY_WRITE, &ad); 2977 } 2978 2979 /* 2980 * Cross reference the peer labels for SO_PEERSEC. 2981 */ 2982 if (rc == 0) { 2983 nsp->smk_packet = ssp->smk_out->smk_known; 2984 ssp->smk_packet = osp->smk_out->smk_known; 2985 } 2986 2987 return rc; 2988 } 2989 2990 /** 2991 * smack_unix_may_send - Smack access on UDS 2992 * @sock: one socket 2993 * @other: the other socket 2994 * 2995 * Return 0 if a subject with the smack of sock could access 2996 * an object with the smack of other, otherwise an error code 2997 */ 2998 static int smack_unix_may_send(struct socket *sock, struct socket *other) 2999 { 3000 struct socket_smack *ssp = sock->sk->sk_security; 3001 struct socket_smack *osp = other->sk->sk_security; 3002 struct smack_known *skp; 3003 struct smk_audit_info ad; 3004 3005 #ifdef CONFIG_AUDIT 3006 struct lsm_network_audit net; 3007 3008 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); 3009 smk_ad_setfield_u_net_sk(&ad, other->sk); 3010 #endif 3011 3012 if (smack_privileged(CAP_MAC_OVERRIDE)) 3013 return 0; 3014 3015 skp = ssp->smk_out; 3016 return smk_access(skp, osp->smk_in, MAY_WRITE, &ad); 3017 } 3018 3019 /** 3020 * smack_socket_sendmsg - Smack check based on destination host 3021 * @sock: the socket 3022 * @msg: the message 3023 * @size: the size of the message 3024 * 3025 * Return 0 if the current subject can write to the destination host. 3026 * For IPv4 this is only a question if the destination is a single label host. 3027 * For IPv6 this is a check against the label of the port. 3028 */ 3029 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, 3030 int size) 3031 { 3032 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; 3033 struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name; 3034 int rc = 0; 3035 3036 /* 3037 * Perfectly reasonable for this to be NULL 3038 */ 3039 if (sip == NULL) 3040 return 0; 3041 3042 switch (sip->sin_family) { 3043 case AF_INET: 3044 rc = smack_netlabel_send(sock->sk, sip); 3045 break; 3046 case AF_INET6: 3047 rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING); 3048 break; 3049 } 3050 return rc; 3051 } 3052 3053 /** 3054 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack 3055 * @sap: netlabel secattr 3056 * @ssp: socket security information 3057 * 3058 * Returns a pointer to a Smack label entry found on the label list. 3059 */ 3060 static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap, 3061 struct socket_smack *ssp) 3062 { 3063 struct smack_known *skp; 3064 int found = 0; 3065 int acat; 3066 int kcat; 3067 3068 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { 3069 /* 3070 * Looks like a CIPSO packet. 3071 * If there are flags but no level netlabel isn't 3072 * behaving the way we expect it to. 3073 * 3074 * Look it up in the label table 3075 * Without guidance regarding the smack value 3076 * for the packet fall back on the network 3077 * ambient value. 3078 */ 3079 rcu_read_lock(); 3080 list_for_each_entry(skp, &smack_known_list, list) { 3081 if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl) 3082 continue; 3083 /* 3084 * Compare the catsets. Use the netlbl APIs. 3085 */ 3086 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) { 3087 if ((skp->smk_netlabel.flags & 3088 NETLBL_SECATTR_MLS_CAT) == 0) 3089 found = 1; 3090 break; 3091 } 3092 for (acat = -1, kcat = -1; acat == kcat; ) { 3093 acat = netlbl_secattr_catmap_walk( 3094 sap->attr.mls.cat, acat + 1); 3095 kcat = netlbl_secattr_catmap_walk( 3096 skp->smk_netlabel.attr.mls.cat, 3097 kcat + 1); 3098 if (acat < 0 || kcat < 0) 3099 break; 3100 } 3101 if (acat == kcat) { 3102 found = 1; 3103 break; 3104 } 3105 } 3106 rcu_read_unlock(); 3107 3108 if (found) 3109 return skp; 3110 3111 if (ssp != NULL && ssp->smk_in == smack_known_star.smk_known) 3112 return &smack_known_web; 3113 return &smack_known_star; 3114 } 3115 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { 3116 /* 3117 * Looks like a fallback, which gives us a secid. 3118 */ 3119 skp = smack_from_secid(sap->attr.secid); 3120 /* 3121 * This has got to be a bug because it is 3122 * impossible to specify a fallback without 3123 * specifying the label, which will ensure 3124 * it has a secid, and the only way to get a 3125 * secid is from a fallback. 3126 */ 3127 BUG_ON(skp == NULL); 3128 return skp; 3129 } 3130 /* 3131 * Without guidance regarding the smack value 3132 * for the packet fall back on the network 3133 * ambient value. 3134 */ 3135 return smack_net_ambient; 3136 } 3137 3138 static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip) 3139 { 3140 u8 nexthdr; 3141 int offset; 3142 int proto = -EINVAL; 3143 struct ipv6hdr _ipv6h; 3144 struct ipv6hdr *ip6; 3145 __be16 frag_off; 3146 struct tcphdr _tcph, *th; 3147 struct udphdr _udph, *uh; 3148 struct dccp_hdr _dccph, *dh; 3149 3150 sip->sin6_port = 0; 3151 3152 offset = skb_network_offset(skb); 3153 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); 3154 if (ip6 == NULL) 3155 return -EINVAL; 3156 sip->sin6_addr = ip6->saddr; 3157 3158 nexthdr = ip6->nexthdr; 3159 offset += sizeof(_ipv6h); 3160 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); 3161 if (offset < 0) 3162 return -EINVAL; 3163 3164 proto = nexthdr; 3165 switch (proto) { 3166 case IPPROTO_TCP: 3167 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); 3168 if (th != NULL) 3169 sip->sin6_port = th->source; 3170 break; 3171 case IPPROTO_UDP: 3172 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); 3173 if (uh != NULL) 3174 sip->sin6_port = uh->source; 3175 break; 3176 case IPPROTO_DCCP: 3177 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); 3178 if (dh != NULL) 3179 sip->sin6_port = dh->dccph_sport; 3180 break; 3181 } 3182 return proto; 3183 } 3184 3185 /** 3186 * smack_socket_sock_rcv_skb - Smack packet delivery access check 3187 * @sk: socket 3188 * @skb: packet 3189 * 3190 * Returns 0 if the packet should be delivered, an error code otherwise 3191 */ 3192 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) 3193 { 3194 struct netlbl_lsm_secattr secattr; 3195 struct socket_smack *ssp = sk->sk_security; 3196 struct smack_known *skp; 3197 struct sockaddr_in6 sadd; 3198 int rc = 0; 3199 struct smk_audit_info ad; 3200 #ifdef CONFIG_AUDIT 3201 struct lsm_network_audit net; 3202 #endif 3203 switch (sk->sk_family) { 3204 case PF_INET: 3205 /* 3206 * Translate what netlabel gave us. 3207 */ 3208 netlbl_secattr_init(&secattr); 3209 3210 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); 3211 if (rc == 0) 3212 skp = smack_from_secattr(&secattr, ssp); 3213 else 3214 skp = smack_net_ambient; 3215 3216 netlbl_secattr_destroy(&secattr); 3217 3218 #ifdef CONFIG_AUDIT 3219 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); 3220 ad.a.u.net->family = sk->sk_family; 3221 ad.a.u.net->netif = skb->skb_iif; 3222 ipv4_skb_to_auditdata(skb, &ad.a, NULL); 3223 #endif 3224 /* 3225 * Receiving a packet requires that the other end 3226 * be able to write here. Read access is not required. 3227 * This is the simplist possible security model 3228 * for networking. 3229 */ 3230 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); 3231 if (rc != 0) 3232 netlbl_skbuff_err(skb, rc, 0); 3233 break; 3234 case PF_INET6: 3235 rc = smk_skb_to_addr_ipv6(skb, &sadd); 3236 if (rc == IPPROTO_UDP || rc == IPPROTO_TCP) 3237 rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING); 3238 else 3239 rc = 0; 3240 break; 3241 } 3242 return rc; 3243 } 3244 3245 /** 3246 * smack_socket_getpeersec_stream - pull in packet label 3247 * @sock: the socket 3248 * @optval: user's destination 3249 * @optlen: size thereof 3250 * @len: max thereof 3251 * 3252 * returns zero on success, an error code otherwise 3253 */ 3254 static int smack_socket_getpeersec_stream(struct socket *sock, 3255 char __user *optval, 3256 int __user *optlen, unsigned len) 3257 { 3258 struct socket_smack *ssp; 3259 char *rcp = ""; 3260 int slen = 1; 3261 int rc = 0; 3262 3263 ssp = sock->sk->sk_security; 3264 if (ssp->smk_packet != NULL) { 3265 rcp = ssp->smk_packet; 3266 slen = strlen(rcp) + 1; 3267 } 3268 3269 if (slen > len) 3270 rc = -ERANGE; 3271 else if (copy_to_user(optval, rcp, slen) != 0) 3272 rc = -EFAULT; 3273 3274 if (put_user(slen, optlen) != 0) 3275 rc = -EFAULT; 3276 3277 return rc; 3278 } 3279 3280 3281 /** 3282 * smack_socket_getpeersec_dgram - pull in packet label 3283 * @sock: the peer socket 3284 * @skb: packet data 3285 * @secid: pointer to where to put the secid of the packet 3286 * 3287 * Sets the netlabel socket state on sk from parent 3288 */ 3289 static int smack_socket_getpeersec_dgram(struct socket *sock, 3290 struct sk_buff *skb, u32 *secid) 3291 3292 { 3293 struct netlbl_lsm_secattr secattr; 3294 struct socket_smack *ssp = NULL; 3295 struct smack_known *skp; 3296 int family = PF_UNSPEC; 3297 u32 s = 0; /* 0 is the invalid secid */ 3298 int rc; 3299 3300 if (skb != NULL) { 3301 if (skb->protocol == htons(ETH_P_IP)) 3302 family = PF_INET; 3303 else if (skb->protocol == htons(ETH_P_IPV6)) 3304 family = PF_INET6; 3305 } 3306 if (family == PF_UNSPEC && sock != NULL) 3307 family = sock->sk->sk_family; 3308 3309 if (family == PF_UNIX) { 3310 ssp = sock->sk->sk_security; 3311 s = ssp->smk_out->smk_secid; 3312 } else if (family == PF_INET || family == PF_INET6) { 3313 /* 3314 * Translate what netlabel gave us. 3315 */ 3316 if (sock != NULL && sock->sk != NULL) 3317 ssp = sock->sk->sk_security; 3318 netlbl_secattr_init(&secattr); 3319 rc = netlbl_skbuff_getattr(skb, family, &secattr); 3320 if (rc == 0) { 3321 skp = smack_from_secattr(&secattr, ssp); 3322 s = skp->smk_secid; 3323 } 3324 netlbl_secattr_destroy(&secattr); 3325 } 3326 *secid = s; 3327 if (s == 0) 3328 return -EINVAL; 3329 return 0; 3330 } 3331 3332 /** 3333 * smack_sock_graft - Initialize a newly created socket with an existing sock 3334 * @sk: child sock 3335 * @parent: parent socket 3336 * 3337 * Set the smk_{in,out} state of an existing sock based on the process that 3338 * is creating the new socket. 3339 */ 3340 static void smack_sock_graft(struct sock *sk, struct socket *parent) 3341 { 3342 struct socket_smack *ssp; 3343 struct smack_known *skp = smk_of_current(); 3344 3345 if (sk == NULL || 3346 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) 3347 return; 3348 3349 ssp = sk->sk_security; 3350 ssp->smk_in = skp->smk_known; 3351 ssp->smk_out = skp; 3352 /* cssp->smk_packet is already set in smack_inet_csk_clone() */ 3353 } 3354 3355 /** 3356 * smack_inet_conn_request - Smack access check on connect 3357 * @sk: socket involved 3358 * @skb: packet 3359 * @req: unused 3360 * 3361 * Returns 0 if a task with the packet label could write to 3362 * the socket, otherwise an error code 3363 */ 3364 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, 3365 struct request_sock *req) 3366 { 3367 u16 family = sk->sk_family; 3368 struct smack_known *skp; 3369 struct socket_smack *ssp = sk->sk_security; 3370 struct netlbl_lsm_secattr secattr; 3371 struct sockaddr_in addr; 3372 struct iphdr *hdr; 3373 char *hsp; 3374 int rc; 3375 struct smk_audit_info ad; 3376 #ifdef CONFIG_AUDIT 3377 struct lsm_network_audit net; 3378 #endif 3379 3380 if (family == PF_INET6) { 3381 /* 3382 * Handle mapped IPv4 packets arriving 3383 * via IPv6 sockets. Don't set up netlabel 3384 * processing on IPv6. 3385 */ 3386 if (skb->protocol == htons(ETH_P_IP)) 3387 family = PF_INET; 3388 else 3389 return 0; 3390 } 3391 3392 netlbl_secattr_init(&secattr); 3393 rc = netlbl_skbuff_getattr(skb, family, &secattr); 3394 if (rc == 0) 3395 skp = smack_from_secattr(&secattr, ssp); 3396 else 3397 skp = &smack_known_huh; 3398 netlbl_secattr_destroy(&secattr); 3399 3400 #ifdef CONFIG_AUDIT 3401 smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net); 3402 ad.a.u.net->family = family; 3403 ad.a.u.net->netif = skb->skb_iif; 3404 ipv4_skb_to_auditdata(skb, &ad.a, NULL); 3405 #endif 3406 /* 3407 * Receiving a packet requires that the other end be able to write 3408 * here. Read access is not required. 3409 */ 3410 rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad); 3411 if (rc != 0) 3412 return rc; 3413 3414 /* 3415 * Save the peer's label in the request_sock so we can later setup 3416 * smk_packet in the child socket so that SO_PEERCRED can report it. 3417 */ 3418 req->peer_secid = skp->smk_secid; 3419 3420 /* 3421 * We need to decide if we want to label the incoming connection here 3422 * if we do we only need to label the request_sock and the stack will 3423 * propagate the wire-label to the sock when it is created. 3424 */ 3425 hdr = ip_hdr(skb); 3426 addr.sin_addr.s_addr = hdr->saddr; 3427 rcu_read_lock(); 3428 hsp = smack_host_label(&addr); 3429 rcu_read_unlock(); 3430 3431 if (hsp == NULL) 3432 rc = netlbl_req_setattr(req, &skp->smk_netlabel); 3433 else 3434 netlbl_req_delattr(req); 3435 3436 return rc; 3437 } 3438 3439 /** 3440 * smack_inet_csk_clone - Copy the connection information to the new socket 3441 * @sk: the new socket 3442 * @req: the connection's request_sock 3443 * 3444 * Transfer the connection's peer label to the newly created socket. 3445 */ 3446 static void smack_inet_csk_clone(struct sock *sk, 3447 const struct request_sock *req) 3448 { 3449 struct socket_smack *ssp = sk->sk_security; 3450 struct smack_known *skp; 3451 3452 if (req->peer_secid != 0) { 3453 skp = smack_from_secid(req->peer_secid); 3454 ssp->smk_packet = skp->smk_known; 3455 } else 3456 ssp->smk_packet = NULL; 3457 } 3458 3459 /* 3460 * Key management security hooks 3461 * 3462 * Casey has not tested key support very heavily. 3463 * The permission check is most likely too restrictive. 3464 * If you care about keys please have a look. 3465 */ 3466 #ifdef CONFIG_KEYS 3467 3468 /** 3469 * smack_key_alloc - Set the key security blob 3470 * @key: object 3471 * @cred: the credentials to use 3472 * @flags: unused 3473 * 3474 * No allocation required 3475 * 3476 * Returns 0 3477 */ 3478 static int smack_key_alloc(struct key *key, const struct cred *cred, 3479 unsigned long flags) 3480 { 3481 struct smack_known *skp = smk_of_task(cred->security); 3482 3483 key->security = skp->smk_known; 3484 return 0; 3485 } 3486 3487 /** 3488 * smack_key_free - Clear the key security blob 3489 * @key: the object 3490 * 3491 * Clear the blob pointer 3492 */ 3493 static void smack_key_free(struct key *key) 3494 { 3495 key->security = NULL; 3496 } 3497 3498 /* 3499 * smack_key_permission - Smack access on a key 3500 * @key_ref: gets to the object 3501 * @cred: the credentials to use 3502 * @perm: unused 3503 * 3504 * Return 0 if the task has read and write to the object, 3505 * an error code otherwise 3506 */ 3507 static int smack_key_permission(key_ref_t key_ref, 3508 const struct cred *cred, key_perm_t perm) 3509 { 3510 struct key *keyp; 3511 struct smk_audit_info ad; 3512 struct smack_known *tkp = smk_of_task(cred->security); 3513 3514 keyp = key_ref_to_ptr(key_ref); 3515 if (keyp == NULL) 3516 return -EINVAL; 3517 /* 3518 * If the key hasn't been initialized give it access so that 3519 * it may do so. 3520 */ 3521 if (keyp->security == NULL) 3522 return 0; 3523 /* 3524 * This should not occur 3525 */ 3526 if (tkp == NULL) 3527 return -EACCES; 3528 #ifdef CONFIG_AUDIT 3529 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); 3530 ad.a.u.key_struct.key = keyp->serial; 3531 ad.a.u.key_struct.key_desc = keyp->description; 3532 #endif 3533 return smk_access(tkp, keyp->security, MAY_READWRITE, &ad); 3534 } 3535 #endif /* CONFIG_KEYS */ 3536 3537 /* 3538 * Smack Audit hooks 3539 * 3540 * Audit requires a unique representation of each Smack specific 3541 * rule. This unique representation is used to distinguish the 3542 * object to be audited from remaining kernel objects and also 3543 * works as a glue between the audit hooks. 3544 * 3545 * Since repository entries are added but never deleted, we'll use 3546 * the smack_known label address related to the given audit rule as 3547 * the needed unique representation. This also better fits the smack 3548 * model where nearly everything is a label. 3549 */ 3550 #ifdef CONFIG_AUDIT 3551 3552 /** 3553 * smack_audit_rule_init - Initialize a smack audit rule 3554 * @field: audit rule fields given from user-space (audit.h) 3555 * @op: required testing operator (=, !=, >, <, ...) 3556 * @rulestr: smack label to be audited 3557 * @vrule: pointer to save our own audit rule representation 3558 * 3559 * Prepare to audit cases where (@field @op @rulestr) is true. 3560 * The label to be audited is created if necessay. 3561 */ 3562 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) 3563 { 3564 char **rule = (char **)vrule; 3565 *rule = NULL; 3566 3567 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) 3568 return -EINVAL; 3569 3570 if (op != Audit_equal && op != Audit_not_equal) 3571 return -EINVAL; 3572 3573 *rule = smk_import(rulestr, 0); 3574 3575 return 0; 3576 } 3577 3578 /** 3579 * smack_audit_rule_known - Distinguish Smack audit rules 3580 * @krule: rule of interest, in Audit kernel representation format 3581 * 3582 * This is used to filter Smack rules from remaining Audit ones. 3583 * If it's proved that this rule belongs to us, the 3584 * audit_rule_match hook will be called to do the final judgement. 3585 */ 3586 static int smack_audit_rule_known(struct audit_krule *krule) 3587 { 3588 struct audit_field *f; 3589 int i; 3590 3591 for (i = 0; i < krule->field_count; i++) { 3592 f = &krule->fields[i]; 3593 3594 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) 3595 return 1; 3596 } 3597 3598 return 0; 3599 } 3600 3601 /** 3602 * smack_audit_rule_match - Audit given object ? 3603 * @secid: security id for identifying the object to test 3604 * @field: audit rule flags given from user-space 3605 * @op: required testing operator 3606 * @vrule: smack internal rule presentation 3607 * @actx: audit context associated with the check 3608 * 3609 * The core Audit hook. It's used to take the decision of 3610 * whether to audit or not to audit a given object. 3611 */ 3612 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, 3613 struct audit_context *actx) 3614 { 3615 struct smack_known *skp; 3616 char *rule = vrule; 3617 3618 if (!rule) { 3619 audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, 3620 "Smack: missing rule\n"); 3621 return -ENOENT; 3622 } 3623 3624 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) 3625 return 0; 3626 3627 skp = smack_from_secid(secid); 3628 3629 /* 3630 * No need to do string comparisons. If a match occurs, 3631 * both pointers will point to the same smack_known 3632 * label. 3633 */ 3634 if (op == Audit_equal) 3635 return (rule == skp->smk_known); 3636 if (op == Audit_not_equal) 3637 return (rule != skp->smk_known); 3638 3639 return 0; 3640 } 3641 3642 /** 3643 * smack_audit_rule_free - free smack rule representation 3644 * @vrule: rule to be freed. 3645 * 3646 * No memory was allocated. 3647 */ 3648 static void smack_audit_rule_free(void *vrule) 3649 { 3650 /* No-op */ 3651 } 3652 3653 #endif /* CONFIG_AUDIT */ 3654 3655 /** 3656 * smack_ismaclabel - check if xattr @name references a smack MAC label 3657 * @name: Full xattr name to check. 3658 */ 3659 static int smack_ismaclabel(const char *name) 3660 { 3661 return (strcmp(name, XATTR_SMACK_SUFFIX) == 0); 3662 } 3663 3664 3665 /** 3666 * smack_secid_to_secctx - return the smack label for a secid 3667 * @secid: incoming integer 3668 * @secdata: destination 3669 * @seclen: how long it is 3670 * 3671 * Exists for networking code. 3672 */ 3673 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) 3674 { 3675 struct smack_known *skp = smack_from_secid(secid); 3676 3677 if (secdata) 3678 *secdata = skp->smk_known; 3679 *seclen = strlen(skp->smk_known); 3680 return 0; 3681 } 3682 3683 /** 3684 * smack_secctx_to_secid - return the secid for a smack label 3685 * @secdata: smack label 3686 * @seclen: how long result is 3687 * @secid: outgoing integer 3688 * 3689 * Exists for audit and networking code. 3690 */ 3691 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) 3692 { 3693 *secid = smack_to_secid(secdata); 3694 return 0; 3695 } 3696 3697 /** 3698 * smack_release_secctx - don't do anything. 3699 * @secdata: unused 3700 * @seclen: unused 3701 * 3702 * Exists to make sure nothing gets done, and properly 3703 */ 3704 static void smack_release_secctx(char *secdata, u32 seclen) 3705 { 3706 } 3707 3708 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) 3709 { 3710 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); 3711 } 3712 3713 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) 3714 { 3715 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); 3716 } 3717 3718 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) 3719 { 3720 int len = 0; 3721 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); 3722 3723 if (len < 0) 3724 return len; 3725 *ctxlen = len; 3726 return 0; 3727 } 3728 3729 struct security_operations smack_ops = { 3730 .name = "smack", 3731 3732 .ptrace_access_check = smack_ptrace_access_check, 3733 .ptrace_traceme = smack_ptrace_traceme, 3734 .syslog = smack_syslog, 3735 3736 .sb_alloc_security = smack_sb_alloc_security, 3737 .sb_free_security = smack_sb_free_security, 3738 .sb_copy_data = smack_sb_copy_data, 3739 .sb_kern_mount = smack_sb_kern_mount, 3740 .sb_statfs = smack_sb_statfs, 3741 .sb_mount = smack_sb_mount, 3742 .sb_umount = smack_sb_umount, 3743 3744 .bprm_set_creds = smack_bprm_set_creds, 3745 .bprm_committing_creds = smack_bprm_committing_creds, 3746 .bprm_secureexec = smack_bprm_secureexec, 3747 3748 .inode_alloc_security = smack_inode_alloc_security, 3749 .inode_free_security = smack_inode_free_security, 3750 .inode_init_security = smack_inode_init_security, 3751 .inode_link = smack_inode_link, 3752 .inode_unlink = smack_inode_unlink, 3753 .inode_rmdir = smack_inode_rmdir, 3754 .inode_rename = smack_inode_rename, 3755 .inode_permission = smack_inode_permission, 3756 .inode_setattr = smack_inode_setattr, 3757 .inode_getattr = smack_inode_getattr, 3758 .inode_setxattr = smack_inode_setxattr, 3759 .inode_post_setxattr = smack_inode_post_setxattr, 3760 .inode_getxattr = smack_inode_getxattr, 3761 .inode_removexattr = smack_inode_removexattr, 3762 .inode_getsecurity = smack_inode_getsecurity, 3763 .inode_setsecurity = smack_inode_setsecurity, 3764 .inode_listsecurity = smack_inode_listsecurity, 3765 .inode_getsecid = smack_inode_getsecid, 3766 3767 .file_permission = smack_file_permission, 3768 .file_alloc_security = smack_file_alloc_security, 3769 .file_free_security = smack_file_free_security, 3770 .file_ioctl = smack_file_ioctl, 3771 .file_lock = smack_file_lock, 3772 .file_fcntl = smack_file_fcntl, 3773 .mmap_file = smack_mmap_file, 3774 .mmap_addr = cap_mmap_addr, 3775 .file_set_fowner = smack_file_set_fowner, 3776 .file_send_sigiotask = smack_file_send_sigiotask, 3777 .file_receive = smack_file_receive, 3778 3779 .file_open = smack_file_open, 3780 3781 .cred_alloc_blank = smack_cred_alloc_blank, 3782 .cred_free = smack_cred_free, 3783 .cred_prepare = smack_cred_prepare, 3784 .cred_transfer = smack_cred_transfer, 3785 .kernel_act_as = smack_kernel_act_as, 3786 .kernel_create_files_as = smack_kernel_create_files_as, 3787 .task_setpgid = smack_task_setpgid, 3788 .task_getpgid = smack_task_getpgid, 3789 .task_getsid = smack_task_getsid, 3790 .task_getsecid = smack_task_getsecid, 3791 .task_setnice = smack_task_setnice, 3792 .task_setioprio = smack_task_setioprio, 3793 .task_getioprio = smack_task_getioprio, 3794 .task_setscheduler = smack_task_setscheduler, 3795 .task_getscheduler = smack_task_getscheduler, 3796 .task_movememory = smack_task_movememory, 3797 .task_kill = smack_task_kill, 3798 .task_wait = smack_task_wait, 3799 .task_to_inode = smack_task_to_inode, 3800 3801 .ipc_permission = smack_ipc_permission, 3802 .ipc_getsecid = smack_ipc_getsecid, 3803 3804 .msg_msg_alloc_security = smack_msg_msg_alloc_security, 3805 .msg_msg_free_security = smack_msg_msg_free_security, 3806 3807 .msg_queue_alloc_security = smack_msg_queue_alloc_security, 3808 .msg_queue_free_security = smack_msg_queue_free_security, 3809 .msg_queue_associate = smack_msg_queue_associate, 3810 .msg_queue_msgctl = smack_msg_queue_msgctl, 3811 .msg_queue_msgsnd = smack_msg_queue_msgsnd, 3812 .msg_queue_msgrcv = smack_msg_queue_msgrcv, 3813 3814 .shm_alloc_security = smack_shm_alloc_security, 3815 .shm_free_security = smack_shm_free_security, 3816 .shm_associate = smack_shm_associate, 3817 .shm_shmctl = smack_shm_shmctl, 3818 .shm_shmat = smack_shm_shmat, 3819 3820 .sem_alloc_security = smack_sem_alloc_security, 3821 .sem_free_security = smack_sem_free_security, 3822 .sem_associate = smack_sem_associate, 3823 .sem_semctl = smack_sem_semctl, 3824 .sem_semop = smack_sem_semop, 3825 3826 .d_instantiate = smack_d_instantiate, 3827 3828 .getprocattr = smack_getprocattr, 3829 .setprocattr = smack_setprocattr, 3830 3831 .unix_stream_connect = smack_unix_stream_connect, 3832 .unix_may_send = smack_unix_may_send, 3833 3834 .socket_post_create = smack_socket_post_create, 3835 .socket_bind = smack_socket_bind, 3836 .socket_connect = smack_socket_connect, 3837 .socket_sendmsg = smack_socket_sendmsg, 3838 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, 3839 .socket_getpeersec_stream = smack_socket_getpeersec_stream, 3840 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, 3841 .sk_alloc_security = smack_sk_alloc_security, 3842 .sk_free_security = smack_sk_free_security, 3843 .sock_graft = smack_sock_graft, 3844 .inet_conn_request = smack_inet_conn_request, 3845 .inet_csk_clone = smack_inet_csk_clone, 3846 3847 /* key management security hooks */ 3848 #ifdef CONFIG_KEYS 3849 .key_alloc = smack_key_alloc, 3850 .key_free = smack_key_free, 3851 .key_permission = smack_key_permission, 3852 #endif /* CONFIG_KEYS */ 3853 3854 /* Audit hooks */ 3855 #ifdef CONFIG_AUDIT 3856 .audit_rule_init = smack_audit_rule_init, 3857 .audit_rule_known = smack_audit_rule_known, 3858 .audit_rule_match = smack_audit_rule_match, 3859 .audit_rule_free = smack_audit_rule_free, 3860 #endif /* CONFIG_AUDIT */ 3861 3862 .ismaclabel = smack_ismaclabel, 3863 .secid_to_secctx = smack_secid_to_secctx, 3864 .secctx_to_secid = smack_secctx_to_secid, 3865 .release_secctx = smack_release_secctx, 3866 .inode_notifysecctx = smack_inode_notifysecctx, 3867 .inode_setsecctx = smack_inode_setsecctx, 3868 .inode_getsecctx = smack_inode_getsecctx, 3869 }; 3870 3871 3872 static __init void init_smack_known_list(void) 3873 { 3874 /* 3875 * Initialize rule list locks 3876 */ 3877 mutex_init(&smack_known_huh.smk_rules_lock); 3878 mutex_init(&smack_known_hat.smk_rules_lock); 3879 mutex_init(&smack_known_floor.smk_rules_lock); 3880 mutex_init(&smack_known_star.smk_rules_lock); 3881 mutex_init(&smack_known_invalid.smk_rules_lock); 3882 mutex_init(&smack_known_web.smk_rules_lock); 3883 /* 3884 * Initialize rule lists 3885 */ 3886 INIT_LIST_HEAD(&smack_known_huh.smk_rules); 3887 INIT_LIST_HEAD(&smack_known_hat.smk_rules); 3888 INIT_LIST_HEAD(&smack_known_star.smk_rules); 3889 INIT_LIST_HEAD(&smack_known_floor.smk_rules); 3890 INIT_LIST_HEAD(&smack_known_invalid.smk_rules); 3891 INIT_LIST_HEAD(&smack_known_web.smk_rules); 3892 /* 3893 * Create the known labels list 3894 */ 3895 smk_insert_entry(&smack_known_huh); 3896 smk_insert_entry(&smack_known_hat); 3897 smk_insert_entry(&smack_known_star); 3898 smk_insert_entry(&smack_known_floor); 3899 smk_insert_entry(&smack_known_invalid); 3900 smk_insert_entry(&smack_known_web); 3901 } 3902 3903 /** 3904 * smack_init - initialize the smack system 3905 * 3906 * Returns 0 3907 */ 3908 static __init int smack_init(void) 3909 { 3910 struct cred *cred; 3911 struct task_smack *tsp; 3912 3913 if (!security_module_enable(&smack_ops)) 3914 return 0; 3915 3916 tsp = new_task_smack(&smack_known_floor, &smack_known_floor, 3917 GFP_KERNEL); 3918 if (tsp == NULL) 3919 return -ENOMEM; 3920 3921 printk(KERN_INFO "Smack: Initializing.\n"); 3922 3923 /* 3924 * Set the security state for the initial task. 3925 */ 3926 cred = (struct cred *) current->cred; 3927 cred->security = tsp; 3928 3929 /* initialize the smack_known_list */ 3930 init_smack_known_list(); 3931 3932 /* 3933 * Register with LSM 3934 */ 3935 if (register_security(&smack_ops)) 3936 panic("smack: Unable to register with kernel.\n"); 3937 3938 return 0; 3939 } 3940 3941 /* 3942 * Smack requires early initialization in order to label 3943 * all processes and objects when they are created. 3944 */ 3945 security_initcall(smack_init); 3946