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