1 /* 2 * Simplified MAC Kernel (smack) security module 3 * 4 * This file contains the smack hook function implementations. 5 * 6 * Author: 7 * Casey Schaufler <casey@schaufler-ca.com> 8 * 9 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com> 10 * Copyright (C) 2009 Hewlett-Packard Development Company, L.P. 11 * Paul Moore <paul.moore@hp.com> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2, 15 * as published by the Free Software Foundation. 16 */ 17 18 #include <linux/xattr.h> 19 #include <linux/pagemap.h> 20 #include <linux/mount.h> 21 #include <linux/stat.h> 22 #include <linux/kd.h> 23 #include <asm/ioctls.h> 24 #include <linux/ip.h> 25 #include <linux/tcp.h> 26 #include <linux/udp.h> 27 #include <linux/slab.h> 28 #include <linux/mutex.h> 29 #include <linux/pipe_fs_i.h> 30 #include <net/netlabel.h> 31 #include <net/cipso_ipv4.h> 32 #include <linux/audit.h> 33 #include <linux/magic.h> 34 #include "smack.h" 35 36 #define task_security(task) (task_cred_xxx((task), security)) 37 38 /** 39 * smk_fetch - Fetch the smack label from a file. 40 * @ip: a pointer to the inode 41 * @dp: a pointer to the dentry 42 * 43 * Returns a pointer to the master list entry for the Smack label 44 * or NULL if there was no label to fetch. 45 */ 46 static char *smk_fetch(struct inode *ip, struct dentry *dp) 47 { 48 int rc; 49 char in[SMK_LABELLEN]; 50 51 if (ip->i_op->getxattr == NULL) 52 return NULL; 53 54 rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN); 55 if (rc < 0) 56 return NULL; 57 58 return smk_import(in, rc); 59 } 60 61 /** 62 * new_inode_smack - allocate an inode security blob 63 * @smack: a pointer to the Smack label to use in the blob 64 * 65 * Returns the new blob or NULL if there's no memory available 66 */ 67 struct inode_smack *new_inode_smack(char *smack) 68 { 69 struct inode_smack *isp; 70 71 isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL); 72 if (isp == NULL) 73 return NULL; 74 75 isp->smk_inode = smack; 76 isp->smk_flags = 0; 77 mutex_init(&isp->smk_lock); 78 79 return isp; 80 } 81 82 /* 83 * LSM hooks. 84 * We he, that is fun! 85 */ 86 87 /** 88 * smack_ptrace_access_check - Smack approval on PTRACE_ATTACH 89 * @ctp: child task pointer 90 * @mode: ptrace attachment mode 91 * 92 * Returns 0 if access is OK, an error code otherwise 93 * 94 * Do the capability checks, and require read and write. 95 */ 96 static int smack_ptrace_access_check(struct task_struct *ctp, unsigned int mode) 97 { 98 int rc; 99 struct smk_audit_info ad; 100 char *sp, *tsp; 101 102 rc = cap_ptrace_access_check(ctp, mode); 103 if (rc != 0) 104 return rc; 105 106 sp = current_security(); 107 tsp = task_security(ctp); 108 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 109 smk_ad_setfield_u_tsk(&ad, ctp); 110 111 /* we won't log here, because rc can be overriden */ 112 rc = smk_access(sp, tsp, MAY_READWRITE, NULL); 113 if (rc != 0 && capable(CAP_MAC_OVERRIDE)) 114 rc = 0; 115 116 smack_log(sp, tsp, MAY_READWRITE, rc, &ad); 117 return rc; 118 } 119 120 /** 121 * smack_ptrace_traceme - Smack approval on PTRACE_TRACEME 122 * @ptp: parent task pointer 123 * 124 * Returns 0 if access is OK, an error code otherwise 125 * 126 * Do the capability checks, and require read and write. 127 */ 128 static int smack_ptrace_traceme(struct task_struct *ptp) 129 { 130 int rc; 131 struct smk_audit_info ad; 132 char *sp, *tsp; 133 134 rc = cap_ptrace_traceme(ptp); 135 if (rc != 0) 136 return rc; 137 138 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 139 smk_ad_setfield_u_tsk(&ad, ptp); 140 141 sp = current_security(); 142 tsp = task_security(ptp); 143 /* we won't log here, because rc can be overriden */ 144 rc = smk_access(tsp, sp, MAY_READWRITE, NULL); 145 if (rc != 0 && has_capability(ptp, CAP_MAC_OVERRIDE)) 146 rc = 0; 147 148 smack_log(tsp, sp, MAY_READWRITE, rc, &ad); 149 return rc; 150 } 151 152 /** 153 * smack_syslog - Smack approval on syslog 154 * @type: message type 155 * 156 * Require that the task has the floor label 157 * 158 * Returns 0 on success, error code otherwise. 159 */ 160 static int smack_syslog(int typefrom_file) 161 { 162 int rc = 0; 163 char *sp = current_security(); 164 165 if (capable(CAP_MAC_OVERRIDE)) 166 return 0; 167 168 if (sp != smack_known_floor.smk_known) 169 rc = -EACCES; 170 171 return rc; 172 } 173 174 175 /* 176 * Superblock Hooks. 177 */ 178 179 /** 180 * smack_sb_alloc_security - allocate a superblock blob 181 * @sb: the superblock getting the blob 182 * 183 * Returns 0 on success or -ENOMEM on error. 184 */ 185 static int smack_sb_alloc_security(struct super_block *sb) 186 { 187 struct superblock_smack *sbsp; 188 189 sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL); 190 191 if (sbsp == NULL) 192 return -ENOMEM; 193 194 sbsp->smk_root = smack_known_floor.smk_known; 195 sbsp->smk_default = smack_known_floor.smk_known; 196 sbsp->smk_floor = smack_known_floor.smk_known; 197 sbsp->smk_hat = smack_known_hat.smk_known; 198 sbsp->smk_initialized = 0; 199 spin_lock_init(&sbsp->smk_sblock); 200 201 sb->s_security = sbsp; 202 203 return 0; 204 } 205 206 /** 207 * smack_sb_free_security - free a superblock blob 208 * @sb: the superblock getting the blob 209 * 210 */ 211 static void smack_sb_free_security(struct super_block *sb) 212 { 213 kfree(sb->s_security); 214 sb->s_security = NULL; 215 } 216 217 /** 218 * smack_sb_copy_data - copy mount options data for processing 219 * @orig: where to start 220 * @smackopts: mount options string 221 * 222 * Returns 0 on success or -ENOMEM on error. 223 * 224 * Copy the Smack specific mount options out of the mount 225 * options list. 226 */ 227 static int smack_sb_copy_data(char *orig, char *smackopts) 228 { 229 char *cp, *commap, *otheropts, *dp; 230 231 otheropts = (char *)get_zeroed_page(GFP_KERNEL); 232 if (otheropts == NULL) 233 return -ENOMEM; 234 235 for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) { 236 if (strstr(cp, SMK_FSDEFAULT) == cp) 237 dp = smackopts; 238 else if (strstr(cp, SMK_FSFLOOR) == cp) 239 dp = smackopts; 240 else if (strstr(cp, SMK_FSHAT) == cp) 241 dp = smackopts; 242 else if (strstr(cp, SMK_FSROOT) == cp) 243 dp = smackopts; 244 else 245 dp = otheropts; 246 247 commap = strchr(cp, ','); 248 if (commap != NULL) 249 *commap = '\0'; 250 251 if (*dp != '\0') 252 strcat(dp, ","); 253 strcat(dp, cp); 254 } 255 256 strcpy(orig, otheropts); 257 free_page((unsigned long)otheropts); 258 259 return 0; 260 } 261 262 /** 263 * smack_sb_kern_mount - Smack specific mount processing 264 * @sb: the file system superblock 265 * @flags: the mount flags 266 * @data: the smack mount options 267 * 268 * Returns 0 on success, an error code on failure 269 */ 270 static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data) 271 { 272 struct dentry *root = sb->s_root; 273 struct inode *inode = root->d_inode; 274 struct superblock_smack *sp = sb->s_security; 275 struct inode_smack *isp; 276 char *op; 277 char *commap; 278 char *nsp; 279 280 spin_lock(&sp->smk_sblock); 281 if (sp->smk_initialized != 0) { 282 spin_unlock(&sp->smk_sblock); 283 return 0; 284 } 285 sp->smk_initialized = 1; 286 spin_unlock(&sp->smk_sblock); 287 288 for (op = data; op != NULL; op = commap) { 289 commap = strchr(op, ','); 290 if (commap != NULL) 291 *commap++ = '\0'; 292 293 if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) { 294 op += strlen(SMK_FSHAT); 295 nsp = smk_import(op, 0); 296 if (nsp != NULL) 297 sp->smk_hat = nsp; 298 } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) { 299 op += strlen(SMK_FSFLOOR); 300 nsp = smk_import(op, 0); 301 if (nsp != NULL) 302 sp->smk_floor = nsp; 303 } else if (strncmp(op, SMK_FSDEFAULT, 304 strlen(SMK_FSDEFAULT)) == 0) { 305 op += strlen(SMK_FSDEFAULT); 306 nsp = smk_import(op, 0); 307 if (nsp != NULL) 308 sp->smk_default = nsp; 309 } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) { 310 op += strlen(SMK_FSROOT); 311 nsp = smk_import(op, 0); 312 if (nsp != NULL) 313 sp->smk_root = nsp; 314 } 315 } 316 317 /* 318 * Initialize the root inode. 319 */ 320 isp = inode->i_security; 321 if (isp == NULL) 322 inode->i_security = new_inode_smack(sp->smk_root); 323 else 324 isp->smk_inode = sp->smk_root; 325 326 return 0; 327 } 328 329 /** 330 * smack_sb_statfs - Smack check on statfs 331 * @dentry: identifies the file system in question 332 * 333 * Returns 0 if current can read the floor of the filesystem, 334 * and error code otherwise 335 */ 336 static int smack_sb_statfs(struct dentry *dentry) 337 { 338 struct superblock_smack *sbp = dentry->d_sb->s_security; 339 int rc; 340 struct smk_audit_info ad; 341 342 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 343 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 344 345 rc = smk_curacc(sbp->smk_floor, MAY_READ, &ad); 346 return rc; 347 } 348 349 /** 350 * smack_sb_mount - Smack check for mounting 351 * @dev_name: unused 352 * @path: mount point 353 * @type: unused 354 * @flags: unused 355 * @data: unused 356 * 357 * Returns 0 if current can write the floor of the filesystem 358 * being mounted on, an error code otherwise. 359 */ 360 static int smack_sb_mount(char *dev_name, struct path *path, 361 char *type, unsigned long flags, void *data) 362 { 363 struct superblock_smack *sbp = path->mnt->mnt_sb->s_security; 364 struct smk_audit_info ad; 365 366 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 367 smk_ad_setfield_u_fs_path(&ad, *path); 368 369 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); 370 } 371 372 /** 373 * smack_sb_umount - Smack check for unmounting 374 * @mnt: file system to unmount 375 * @flags: unused 376 * 377 * Returns 0 if current can write the floor of the filesystem 378 * being unmounted, an error code otherwise. 379 */ 380 static int smack_sb_umount(struct vfsmount *mnt, int flags) 381 { 382 struct superblock_smack *sbp; 383 struct smk_audit_info ad; 384 385 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 386 smk_ad_setfield_u_fs_path_dentry(&ad, mnt->mnt_root); 387 smk_ad_setfield_u_fs_path_mnt(&ad, mnt); 388 389 sbp = mnt->mnt_sb->s_security; 390 return smk_curacc(sbp->smk_floor, MAY_WRITE, &ad); 391 } 392 393 /* 394 * Inode hooks 395 */ 396 397 /** 398 * smack_inode_alloc_security - allocate an inode blob 399 * @inode: the inode in need of a blob 400 * 401 * Returns 0 if it gets a blob, -ENOMEM otherwise 402 */ 403 static int smack_inode_alloc_security(struct inode *inode) 404 { 405 inode->i_security = new_inode_smack(current_security()); 406 if (inode->i_security == NULL) 407 return -ENOMEM; 408 return 0; 409 } 410 411 /** 412 * smack_inode_free_security - free an inode blob 413 * @inode: the inode with a blob 414 * 415 * Clears the blob pointer in inode 416 */ 417 static void smack_inode_free_security(struct inode *inode) 418 { 419 kfree(inode->i_security); 420 inode->i_security = NULL; 421 } 422 423 /** 424 * smack_inode_init_security - copy out the smack from an inode 425 * @inode: the inode 426 * @dir: unused 427 * @name: where to put the attribute name 428 * @value: where to put the attribute value 429 * @len: where to put the length of the attribute 430 * 431 * Returns 0 if it all works out, -ENOMEM if there's no memory 432 */ 433 static int smack_inode_init_security(struct inode *inode, struct inode *dir, 434 char **name, void **value, size_t *len) 435 { 436 char *isp = smk_of_inode(inode); 437 438 if (name) { 439 *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL); 440 if (*name == NULL) 441 return -ENOMEM; 442 } 443 444 if (value) { 445 *value = kstrdup(isp, GFP_KERNEL); 446 if (*value == NULL) 447 return -ENOMEM; 448 } 449 450 if (len) 451 *len = strlen(isp) + 1; 452 453 return 0; 454 } 455 456 /** 457 * smack_inode_link - Smack check on link 458 * @old_dentry: the existing object 459 * @dir: unused 460 * @new_dentry: the new object 461 * 462 * Returns 0 if access is permitted, an error code otherwise 463 */ 464 static int smack_inode_link(struct dentry *old_dentry, struct inode *dir, 465 struct dentry *new_dentry) 466 { 467 char *isp; 468 struct smk_audit_info ad; 469 int rc; 470 471 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 472 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); 473 474 isp = smk_of_inode(old_dentry->d_inode); 475 rc = smk_curacc(isp, MAY_WRITE, &ad); 476 477 if (rc == 0 && new_dentry->d_inode != NULL) { 478 isp = smk_of_inode(new_dentry->d_inode); 479 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); 480 rc = smk_curacc(isp, MAY_WRITE, &ad); 481 } 482 483 return rc; 484 } 485 486 /** 487 * smack_inode_unlink - Smack check on inode deletion 488 * @dir: containing directory object 489 * @dentry: file to unlink 490 * 491 * Returns 0 if current can write the containing directory 492 * and the object, error code otherwise 493 */ 494 static int smack_inode_unlink(struct inode *dir, struct dentry *dentry) 495 { 496 struct inode *ip = dentry->d_inode; 497 struct smk_audit_info ad; 498 int rc; 499 500 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 501 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 502 503 /* 504 * You need write access to the thing you're unlinking 505 */ 506 rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad); 507 if (rc == 0) { 508 /* 509 * You also need write access to the containing directory 510 */ 511 smk_ad_setfield_u_fs_path_dentry(&ad, NULL); 512 smk_ad_setfield_u_fs_inode(&ad, dir); 513 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); 514 } 515 return rc; 516 } 517 518 /** 519 * smack_inode_rmdir - Smack check on directory deletion 520 * @dir: containing directory object 521 * @dentry: directory to unlink 522 * 523 * Returns 0 if current can write the containing directory 524 * and the directory, error code otherwise 525 */ 526 static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry) 527 { 528 struct smk_audit_info ad; 529 int rc; 530 531 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 532 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 533 534 /* 535 * You need write access to the thing you're removing 536 */ 537 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); 538 if (rc == 0) { 539 /* 540 * You also need write access to the containing directory 541 */ 542 smk_ad_setfield_u_fs_path_dentry(&ad, NULL); 543 smk_ad_setfield_u_fs_inode(&ad, dir); 544 rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad); 545 } 546 547 return rc; 548 } 549 550 /** 551 * smack_inode_rename - Smack check on rename 552 * @old_inode: the old directory 553 * @old_dentry: unused 554 * @new_inode: the new directory 555 * @new_dentry: unused 556 * 557 * Read and write access is required on both the old and 558 * new directories. 559 * 560 * Returns 0 if access is permitted, an error code otherwise 561 */ 562 static int smack_inode_rename(struct inode *old_inode, 563 struct dentry *old_dentry, 564 struct inode *new_inode, 565 struct dentry *new_dentry) 566 { 567 int rc; 568 char *isp; 569 struct smk_audit_info ad; 570 571 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 572 smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry); 573 574 isp = smk_of_inode(old_dentry->d_inode); 575 rc = smk_curacc(isp, MAY_READWRITE, &ad); 576 577 if (rc == 0 && new_dentry->d_inode != NULL) { 578 isp = smk_of_inode(new_dentry->d_inode); 579 smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry); 580 rc = smk_curacc(isp, MAY_READWRITE, &ad); 581 } 582 return rc; 583 } 584 585 /** 586 * smack_inode_permission - Smack version of permission() 587 * @inode: the inode in question 588 * @mask: the access requested 589 * 590 * This is the important Smack hook. 591 * 592 * Returns 0 if access is permitted, -EACCES otherwise 593 */ 594 static int smack_inode_permission(struct inode *inode, int mask) 595 { 596 struct smk_audit_info ad; 597 598 mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); 599 /* 600 * No permission to check. Existence test. Yup, it's there. 601 */ 602 if (mask == 0) 603 return 0; 604 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 605 smk_ad_setfield_u_fs_inode(&ad, inode); 606 return smk_curacc(smk_of_inode(inode), mask, &ad); 607 } 608 609 /** 610 * smack_inode_setattr - Smack check for setting attributes 611 * @dentry: the object 612 * @iattr: for the force flag 613 * 614 * Returns 0 if access is permitted, an error code otherwise 615 */ 616 static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr) 617 { 618 struct smk_audit_info ad; 619 /* 620 * Need to allow for clearing the setuid bit. 621 */ 622 if (iattr->ia_valid & ATTR_FORCE) 623 return 0; 624 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 625 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 626 627 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); 628 } 629 630 /** 631 * smack_inode_getattr - Smack check for getting attributes 632 * @mnt: unused 633 * @dentry: the object 634 * 635 * Returns 0 if access is permitted, an error code otherwise 636 */ 637 static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) 638 { 639 struct smk_audit_info ad; 640 641 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 642 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 643 smk_ad_setfield_u_fs_path_mnt(&ad, mnt); 644 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); 645 } 646 647 /** 648 * smack_inode_setxattr - Smack check for setting xattrs 649 * @dentry: the object 650 * @name: name of the attribute 651 * @value: unused 652 * @size: unused 653 * @flags: unused 654 * 655 * This protects the Smack attribute explicitly. 656 * 657 * Returns 0 if access is permitted, an error code otherwise 658 */ 659 static int smack_inode_setxattr(struct dentry *dentry, const char *name, 660 const void *value, size_t size, int flags) 661 { 662 struct smk_audit_info ad; 663 int rc = 0; 664 665 if (strcmp(name, XATTR_NAME_SMACK) == 0 || 666 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || 667 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { 668 if (!capable(CAP_MAC_ADMIN)) 669 rc = -EPERM; 670 /* 671 * check label validity here so import wont fail on 672 * post_setxattr 673 */ 674 if (size == 0 || size >= SMK_LABELLEN || 675 smk_import(value, size) == NULL) 676 rc = -EINVAL; 677 } else 678 rc = cap_inode_setxattr(dentry, name, value, size, flags); 679 680 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 681 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 682 683 if (rc == 0) 684 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); 685 686 return rc; 687 } 688 689 /** 690 * smack_inode_post_setxattr - Apply the Smack update approved above 691 * @dentry: object 692 * @name: attribute name 693 * @value: attribute value 694 * @size: attribute size 695 * @flags: unused 696 * 697 * Set the pointer in the inode blob to the entry found 698 * in the master label list. 699 */ 700 static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, 701 const void *value, size_t size, int flags) 702 { 703 struct inode_smack *isp; 704 char *nsp; 705 706 /* 707 * Not SMACK 708 */ 709 if (strcmp(name, XATTR_NAME_SMACK)) 710 return; 711 712 isp = dentry->d_inode->i_security; 713 714 /* 715 * No locking is done here. This is a pointer 716 * assignment. 717 */ 718 nsp = smk_import(value, size); 719 if (nsp != NULL) 720 isp->smk_inode = nsp; 721 else 722 isp->smk_inode = smack_known_invalid.smk_known; 723 724 return; 725 } 726 727 /* 728 * smack_inode_getxattr - Smack check on getxattr 729 * @dentry: the object 730 * @name: unused 731 * 732 * Returns 0 if access is permitted, an error code otherwise 733 */ 734 static int smack_inode_getxattr(struct dentry *dentry, const char *name) 735 { 736 struct smk_audit_info ad; 737 738 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 739 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 740 741 return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ, &ad); 742 } 743 744 /* 745 * smack_inode_removexattr - Smack check on removexattr 746 * @dentry: the object 747 * @name: name of the attribute 748 * 749 * Removing the Smack attribute requires CAP_MAC_ADMIN 750 * 751 * Returns 0 if access is permitted, an error code otherwise 752 */ 753 static int smack_inode_removexattr(struct dentry *dentry, const char *name) 754 { 755 struct smk_audit_info ad; 756 int rc = 0; 757 758 if (strcmp(name, XATTR_NAME_SMACK) == 0 || 759 strcmp(name, XATTR_NAME_SMACKIPIN) == 0 || 760 strcmp(name, XATTR_NAME_SMACKIPOUT) == 0) { 761 if (!capable(CAP_MAC_ADMIN)) 762 rc = -EPERM; 763 } else 764 rc = cap_inode_removexattr(dentry, name); 765 766 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 767 smk_ad_setfield_u_fs_path_dentry(&ad, dentry); 768 if (rc == 0) 769 rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE, &ad); 770 771 return rc; 772 } 773 774 /** 775 * smack_inode_getsecurity - get smack xattrs 776 * @inode: the object 777 * @name: attribute name 778 * @buffer: where to put the result 779 * @alloc: unused 780 * 781 * Returns the size of the attribute or an error code 782 */ 783 static int smack_inode_getsecurity(const struct inode *inode, 784 const char *name, void **buffer, 785 bool alloc) 786 { 787 struct socket_smack *ssp; 788 struct socket *sock; 789 struct super_block *sbp; 790 struct inode *ip = (struct inode *)inode; 791 char *isp; 792 int ilen; 793 int rc = 0; 794 795 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { 796 isp = smk_of_inode(inode); 797 ilen = strlen(isp) + 1; 798 *buffer = isp; 799 return ilen; 800 } 801 802 /* 803 * The rest of the Smack xattrs are only on sockets. 804 */ 805 sbp = ip->i_sb; 806 if (sbp->s_magic != SOCKFS_MAGIC) 807 return -EOPNOTSUPP; 808 809 sock = SOCKET_I(ip); 810 if (sock == NULL || sock->sk == NULL) 811 return -EOPNOTSUPP; 812 813 ssp = sock->sk->sk_security; 814 815 if (strcmp(name, XATTR_SMACK_IPIN) == 0) 816 isp = ssp->smk_in; 817 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) 818 isp = ssp->smk_out; 819 else 820 return -EOPNOTSUPP; 821 822 ilen = strlen(isp) + 1; 823 if (rc == 0) { 824 *buffer = isp; 825 rc = ilen; 826 } 827 828 return rc; 829 } 830 831 832 /** 833 * smack_inode_listsecurity - list the Smack attributes 834 * @inode: the object 835 * @buffer: where they go 836 * @buffer_size: size of buffer 837 * 838 * Returns 0 on success, -EINVAL otherwise 839 */ 840 static int smack_inode_listsecurity(struct inode *inode, char *buffer, 841 size_t buffer_size) 842 { 843 int len = strlen(XATTR_NAME_SMACK); 844 845 if (buffer != NULL && len <= buffer_size) { 846 memcpy(buffer, XATTR_NAME_SMACK, len); 847 return len; 848 } 849 return -EINVAL; 850 } 851 852 /** 853 * smack_inode_getsecid - Extract inode's security id 854 * @inode: inode to extract the info from 855 * @secid: where result will be saved 856 */ 857 static void smack_inode_getsecid(const struct inode *inode, u32 *secid) 858 { 859 struct inode_smack *isp = inode->i_security; 860 861 *secid = smack_to_secid(isp->smk_inode); 862 } 863 864 /* 865 * File Hooks 866 */ 867 868 /** 869 * smack_file_permission - Smack check on file operations 870 * @file: unused 871 * @mask: unused 872 * 873 * Returns 0 874 * 875 * Should access checks be done on each read or write? 876 * UNICOS and SELinux say yes. 877 * Trusted Solaris, Trusted Irix, and just about everyone else says no. 878 * 879 * I'll say no for now. Smack does not do the frequent 880 * label changing that SELinux does. 881 */ 882 static int smack_file_permission(struct file *file, int mask) 883 { 884 return 0; 885 } 886 887 /** 888 * smack_file_alloc_security - assign a file security blob 889 * @file: the object 890 * 891 * The security blob for a file is a pointer to the master 892 * label list, so no allocation is done. 893 * 894 * Returns 0 895 */ 896 static int smack_file_alloc_security(struct file *file) 897 { 898 file->f_security = current_security(); 899 return 0; 900 } 901 902 /** 903 * smack_file_free_security - clear a file security blob 904 * @file: the object 905 * 906 * The security blob for a file is a pointer to the master 907 * label list, so no memory is freed. 908 */ 909 static void smack_file_free_security(struct file *file) 910 { 911 file->f_security = NULL; 912 } 913 914 /** 915 * smack_file_ioctl - Smack check on ioctls 916 * @file: the object 917 * @cmd: what to do 918 * @arg: unused 919 * 920 * Relies heavily on the correct use of the ioctl command conventions. 921 * 922 * Returns 0 if allowed, error code otherwise 923 */ 924 static int smack_file_ioctl(struct file *file, unsigned int cmd, 925 unsigned long arg) 926 { 927 int rc = 0; 928 struct smk_audit_info ad; 929 930 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 931 smk_ad_setfield_u_fs_path(&ad, file->f_path); 932 933 if (_IOC_DIR(cmd) & _IOC_WRITE) 934 rc = smk_curacc(file->f_security, MAY_WRITE, &ad); 935 936 if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) 937 rc = smk_curacc(file->f_security, MAY_READ, &ad); 938 939 return rc; 940 } 941 942 /** 943 * smack_file_lock - Smack check on file locking 944 * @file: the object 945 * @cmd: unused 946 * 947 * Returns 0 if current has write access, error code otherwise 948 */ 949 static int smack_file_lock(struct file *file, unsigned int cmd) 950 { 951 struct smk_audit_info ad; 952 953 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 954 smk_ad_setfield_u_fs_path_dentry(&ad, file->f_path.dentry); 955 return smk_curacc(file->f_security, MAY_WRITE, &ad); 956 } 957 958 /** 959 * smack_file_fcntl - Smack check on fcntl 960 * @file: the object 961 * @cmd: what action to check 962 * @arg: unused 963 * 964 * Returns 0 if current has access, error code otherwise 965 */ 966 static int smack_file_fcntl(struct file *file, unsigned int cmd, 967 unsigned long arg) 968 { 969 struct smk_audit_info ad; 970 int rc; 971 972 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_FS); 973 smk_ad_setfield_u_fs_path(&ad, file->f_path); 974 975 switch (cmd) { 976 case F_DUPFD: 977 case F_GETFD: 978 case F_GETFL: 979 case F_GETLK: 980 case F_GETOWN: 981 case F_GETSIG: 982 rc = smk_curacc(file->f_security, MAY_READ, &ad); 983 break; 984 case F_SETFD: 985 case F_SETFL: 986 case F_SETLK: 987 case F_SETLKW: 988 case F_SETOWN: 989 case F_SETSIG: 990 rc = smk_curacc(file->f_security, MAY_WRITE, &ad); 991 break; 992 default: 993 rc = smk_curacc(file->f_security, MAY_READWRITE, &ad); 994 } 995 996 return rc; 997 } 998 999 /** 1000 * smack_file_set_fowner - set the file security blob value 1001 * @file: object in question 1002 * 1003 * Returns 0 1004 * Further research may be required on this one. 1005 */ 1006 static int smack_file_set_fowner(struct file *file) 1007 { 1008 file->f_security = current_security(); 1009 return 0; 1010 } 1011 1012 /** 1013 * smack_file_send_sigiotask - Smack on sigio 1014 * @tsk: The target task 1015 * @fown: the object the signal come from 1016 * @signum: unused 1017 * 1018 * Allow a privileged task to get signals even if it shouldn't 1019 * 1020 * Returns 0 if a subject with the object's smack could 1021 * write to the task, an error code otherwise. 1022 */ 1023 static int smack_file_send_sigiotask(struct task_struct *tsk, 1024 struct fown_struct *fown, int signum) 1025 { 1026 struct file *file; 1027 int rc; 1028 char *tsp = tsk->cred->security; 1029 struct smk_audit_info ad; 1030 1031 /* 1032 * struct fown_struct is never outside the context of a struct file 1033 */ 1034 file = container_of(fown, struct file, f_owner); 1035 /* we don't log here as rc can be overriden */ 1036 rc = smk_access(file->f_security, tsp, MAY_WRITE, NULL); 1037 if (rc != 0 && has_capability(tsk, CAP_MAC_OVERRIDE)) 1038 rc = 0; 1039 1040 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 1041 smk_ad_setfield_u_tsk(&ad, tsk); 1042 smack_log(file->f_security, tsp, MAY_WRITE, rc, &ad); 1043 return rc; 1044 } 1045 1046 /** 1047 * smack_file_receive - Smack file receive check 1048 * @file: the object 1049 * 1050 * Returns 0 if current has access, error code otherwise 1051 */ 1052 static int smack_file_receive(struct file *file) 1053 { 1054 int may = 0; 1055 struct smk_audit_info ad; 1056 1057 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 1058 smk_ad_setfield_u_fs_path(&ad, file->f_path); 1059 /* 1060 * This code relies on bitmasks. 1061 */ 1062 if (file->f_mode & FMODE_READ) 1063 may = MAY_READ; 1064 if (file->f_mode & FMODE_WRITE) 1065 may |= MAY_WRITE; 1066 1067 return smk_curacc(file->f_security, may, &ad); 1068 } 1069 1070 /* 1071 * Task hooks 1072 */ 1073 1074 /** 1075 * smack_cred_alloc_blank - "allocate" blank task-level security credentials 1076 * @new: the new credentials 1077 * @gfp: the atomicity of any memory allocations 1078 * 1079 * Prepare a blank set of credentials for modification. This must allocate all 1080 * the memory the LSM module might require such that cred_transfer() can 1081 * complete without error. 1082 */ 1083 static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) 1084 { 1085 cred->security = NULL; 1086 return 0; 1087 } 1088 1089 1090 /** 1091 * smack_cred_free - "free" task-level security credentials 1092 * @cred: the credentials in question 1093 * 1094 * Smack isn't using copies of blobs. Everyone 1095 * points to an immutable list. The blobs never go away. 1096 * There is no leak here. 1097 */ 1098 static void smack_cred_free(struct cred *cred) 1099 { 1100 cred->security = NULL; 1101 } 1102 1103 /** 1104 * smack_cred_prepare - prepare new set of credentials for modification 1105 * @new: the new credentials 1106 * @old: the original credentials 1107 * @gfp: the atomicity of any memory allocations 1108 * 1109 * Prepare a new set of credentials for modification. 1110 */ 1111 static int smack_cred_prepare(struct cred *new, const struct cred *old, 1112 gfp_t gfp) 1113 { 1114 new->security = old->security; 1115 return 0; 1116 } 1117 1118 /** 1119 * smack_cred_transfer - Transfer the old credentials to the new credentials 1120 * @new: the new credentials 1121 * @old: the original credentials 1122 * 1123 * Fill in a set of blank credentials from another set of credentials. 1124 */ 1125 static void smack_cred_transfer(struct cred *new, const struct cred *old) 1126 { 1127 new->security = old->security; 1128 } 1129 1130 /** 1131 * smack_kernel_act_as - Set the subjective context in a set of credentials 1132 * @new: points to the set of credentials to be modified. 1133 * @secid: specifies the security ID to be set 1134 * 1135 * Set the security data for a kernel service. 1136 */ 1137 static int smack_kernel_act_as(struct cred *new, u32 secid) 1138 { 1139 char *smack = smack_from_secid(secid); 1140 1141 if (smack == NULL) 1142 return -EINVAL; 1143 1144 new->security = smack; 1145 return 0; 1146 } 1147 1148 /** 1149 * smack_kernel_create_files_as - Set the file creation label in a set of creds 1150 * @new: points to the set of credentials to be modified 1151 * @inode: points to the inode to use as a reference 1152 * 1153 * Set the file creation context in a set of credentials to the same 1154 * as the objective context of the specified inode 1155 */ 1156 static int smack_kernel_create_files_as(struct cred *new, 1157 struct inode *inode) 1158 { 1159 struct inode_smack *isp = inode->i_security; 1160 1161 new->security = isp->smk_inode; 1162 return 0; 1163 } 1164 1165 /** 1166 * smk_curacc_on_task - helper to log task related access 1167 * @p: the task object 1168 * @access : the access requested 1169 * 1170 * Return 0 if access is permitted 1171 */ 1172 static int smk_curacc_on_task(struct task_struct *p, int access) 1173 { 1174 struct smk_audit_info ad; 1175 1176 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 1177 smk_ad_setfield_u_tsk(&ad, p); 1178 return smk_curacc(task_security(p), access, &ad); 1179 } 1180 1181 /** 1182 * smack_task_setpgid - Smack check on setting pgid 1183 * @p: the task object 1184 * @pgid: unused 1185 * 1186 * Return 0 if write access is permitted 1187 */ 1188 static int smack_task_setpgid(struct task_struct *p, pid_t pgid) 1189 { 1190 return smk_curacc_on_task(p, MAY_WRITE); 1191 } 1192 1193 /** 1194 * smack_task_getpgid - Smack access check for getpgid 1195 * @p: the object task 1196 * 1197 * Returns 0 if current can read the object task, error code otherwise 1198 */ 1199 static int smack_task_getpgid(struct task_struct *p) 1200 { 1201 return smk_curacc_on_task(p, MAY_READ); 1202 } 1203 1204 /** 1205 * smack_task_getsid - Smack access check for getsid 1206 * @p: the object task 1207 * 1208 * Returns 0 if current can read the object task, error code otherwise 1209 */ 1210 static int smack_task_getsid(struct task_struct *p) 1211 { 1212 return smk_curacc_on_task(p, MAY_READ); 1213 } 1214 1215 /** 1216 * smack_task_getsecid - get the secid of the task 1217 * @p: the object task 1218 * @secid: where to put the result 1219 * 1220 * Sets the secid to contain a u32 version of the smack label. 1221 */ 1222 static void smack_task_getsecid(struct task_struct *p, u32 *secid) 1223 { 1224 *secid = smack_to_secid(task_security(p)); 1225 } 1226 1227 /** 1228 * smack_task_setnice - Smack check on setting nice 1229 * @p: the task object 1230 * @nice: unused 1231 * 1232 * Return 0 if write access is permitted 1233 */ 1234 static int smack_task_setnice(struct task_struct *p, int nice) 1235 { 1236 int rc; 1237 1238 rc = cap_task_setnice(p, nice); 1239 if (rc == 0) 1240 rc = smk_curacc_on_task(p, MAY_WRITE); 1241 return rc; 1242 } 1243 1244 /** 1245 * smack_task_setioprio - Smack check on setting ioprio 1246 * @p: the task object 1247 * @ioprio: unused 1248 * 1249 * Return 0 if write access is permitted 1250 */ 1251 static int smack_task_setioprio(struct task_struct *p, int ioprio) 1252 { 1253 int rc; 1254 1255 rc = cap_task_setioprio(p, ioprio); 1256 if (rc == 0) 1257 rc = smk_curacc_on_task(p, MAY_WRITE); 1258 return rc; 1259 } 1260 1261 /** 1262 * smack_task_getioprio - Smack check on reading ioprio 1263 * @p: the task object 1264 * 1265 * Return 0 if read access is permitted 1266 */ 1267 static int smack_task_getioprio(struct task_struct *p) 1268 { 1269 return smk_curacc_on_task(p, MAY_READ); 1270 } 1271 1272 /** 1273 * smack_task_setscheduler - Smack check on setting scheduler 1274 * @p: the task object 1275 * @policy: unused 1276 * @lp: unused 1277 * 1278 * Return 0 if read access is permitted 1279 */ 1280 static int smack_task_setscheduler(struct task_struct *p) 1281 { 1282 int rc; 1283 1284 rc = cap_task_setscheduler(p); 1285 if (rc == 0) 1286 rc = smk_curacc_on_task(p, MAY_WRITE); 1287 return rc; 1288 } 1289 1290 /** 1291 * smack_task_getscheduler - Smack check on reading scheduler 1292 * @p: the task object 1293 * 1294 * Return 0 if read access is permitted 1295 */ 1296 static int smack_task_getscheduler(struct task_struct *p) 1297 { 1298 return smk_curacc_on_task(p, MAY_READ); 1299 } 1300 1301 /** 1302 * smack_task_movememory - Smack check on moving memory 1303 * @p: the task object 1304 * 1305 * Return 0 if write access is permitted 1306 */ 1307 static int smack_task_movememory(struct task_struct *p) 1308 { 1309 return smk_curacc_on_task(p, MAY_WRITE); 1310 } 1311 1312 /** 1313 * smack_task_kill - Smack check on signal delivery 1314 * @p: the task object 1315 * @info: unused 1316 * @sig: unused 1317 * @secid: identifies the smack to use in lieu of current's 1318 * 1319 * Return 0 if write access is permitted 1320 * 1321 * The secid behavior is an artifact of an SELinux hack 1322 * in the USB code. Someday it may go away. 1323 */ 1324 static int smack_task_kill(struct task_struct *p, struct siginfo *info, 1325 int sig, u32 secid) 1326 { 1327 struct smk_audit_info ad; 1328 1329 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 1330 smk_ad_setfield_u_tsk(&ad, p); 1331 /* 1332 * Sending a signal requires that the sender 1333 * can write the receiver. 1334 */ 1335 if (secid == 0) 1336 return smk_curacc(task_security(p), MAY_WRITE, &ad); 1337 /* 1338 * If the secid isn't 0 we're dealing with some USB IO 1339 * specific behavior. This is not clean. For one thing 1340 * we can't take privilege into account. 1341 */ 1342 return smk_access(smack_from_secid(secid), task_security(p), 1343 MAY_WRITE, &ad); 1344 } 1345 1346 /** 1347 * smack_task_wait - Smack access check for waiting 1348 * @p: task to wait for 1349 * 1350 * Returns 0 if current can wait for p, error code otherwise 1351 */ 1352 static int smack_task_wait(struct task_struct *p) 1353 { 1354 struct smk_audit_info ad; 1355 char *sp = current_security(); 1356 char *tsp = task_security(p); 1357 int rc; 1358 1359 /* we don't log here, we can be overriden */ 1360 rc = smk_access(sp, tsp, MAY_WRITE, NULL); 1361 if (rc == 0) 1362 goto out_log; 1363 1364 /* 1365 * Allow the operation to succeed if either task 1366 * has privilege to perform operations that might 1367 * account for the smack labels having gotten to 1368 * be different in the first place. 1369 * 1370 * This breaks the strict subject/object access 1371 * control ideal, taking the object's privilege 1372 * state into account in the decision as well as 1373 * the smack value. 1374 */ 1375 if (capable(CAP_MAC_OVERRIDE) || has_capability(p, CAP_MAC_OVERRIDE)) 1376 rc = 0; 1377 /* we log only if we didn't get overriden */ 1378 out_log: 1379 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK); 1380 smk_ad_setfield_u_tsk(&ad, p); 1381 smack_log(sp, tsp, MAY_WRITE, rc, &ad); 1382 return rc; 1383 } 1384 1385 /** 1386 * smack_task_to_inode - copy task smack into the inode blob 1387 * @p: task to copy from 1388 * @inode: inode to copy to 1389 * 1390 * Sets the smack pointer in the inode security blob 1391 */ 1392 static void smack_task_to_inode(struct task_struct *p, struct inode *inode) 1393 { 1394 struct inode_smack *isp = inode->i_security; 1395 isp->smk_inode = task_security(p); 1396 } 1397 1398 /* 1399 * Socket hooks. 1400 */ 1401 1402 /** 1403 * smack_sk_alloc_security - Allocate a socket blob 1404 * @sk: the socket 1405 * @family: unused 1406 * @gfp_flags: memory allocation flags 1407 * 1408 * Assign Smack pointers to current 1409 * 1410 * Returns 0 on success, -ENOMEM is there's no memory 1411 */ 1412 static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags) 1413 { 1414 char *csp = current_security(); 1415 struct socket_smack *ssp; 1416 1417 ssp = kzalloc(sizeof(struct socket_smack), gfp_flags); 1418 if (ssp == NULL) 1419 return -ENOMEM; 1420 1421 ssp->smk_in = csp; 1422 ssp->smk_out = csp; 1423 ssp->smk_packet[0] = '\0'; 1424 1425 sk->sk_security = ssp; 1426 1427 return 0; 1428 } 1429 1430 /** 1431 * smack_sk_free_security - Free a socket blob 1432 * @sk: the socket 1433 * 1434 * Clears the blob pointer 1435 */ 1436 static void smack_sk_free_security(struct sock *sk) 1437 { 1438 kfree(sk->sk_security); 1439 } 1440 1441 /** 1442 * smack_host_label - check host based restrictions 1443 * @sip: the object end 1444 * 1445 * looks for host based access restrictions 1446 * 1447 * This version will only be appropriate for really small sets of single label 1448 * hosts. The caller is responsible for ensuring that the RCU read lock is 1449 * taken before calling this function. 1450 * 1451 * Returns the label of the far end or NULL if it's not special. 1452 */ 1453 static char *smack_host_label(struct sockaddr_in *sip) 1454 { 1455 struct smk_netlbladdr *snp; 1456 struct in_addr *siap = &sip->sin_addr; 1457 1458 if (siap->s_addr == 0) 1459 return NULL; 1460 1461 list_for_each_entry_rcu(snp, &smk_netlbladdr_list, list) 1462 /* 1463 * we break after finding the first match because 1464 * the list is sorted from longest to shortest mask 1465 * so we have found the most specific match 1466 */ 1467 if ((&snp->smk_host.sin_addr)->s_addr == 1468 (siap->s_addr & (&snp->smk_mask)->s_addr)) { 1469 /* we have found the special CIPSO option */ 1470 if (snp->smk_label == smack_cipso_option) 1471 return NULL; 1472 return snp->smk_label; 1473 } 1474 1475 return NULL; 1476 } 1477 1478 /** 1479 * smack_set_catset - convert a capset to netlabel mls categories 1480 * @catset: the Smack categories 1481 * @sap: where to put the netlabel categories 1482 * 1483 * Allocates and fills attr.mls.cat 1484 */ 1485 static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap) 1486 { 1487 unsigned char *cp; 1488 unsigned char m; 1489 int cat; 1490 int rc; 1491 int byte; 1492 1493 if (!catset) 1494 return; 1495 1496 sap->flags |= NETLBL_SECATTR_MLS_CAT; 1497 sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC); 1498 sap->attr.mls.cat->startbit = 0; 1499 1500 for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++) 1501 for (m = 0x80; m != 0; m >>= 1, cat++) { 1502 if ((m & *cp) == 0) 1503 continue; 1504 rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat, 1505 cat, GFP_ATOMIC); 1506 } 1507 } 1508 1509 /** 1510 * smack_to_secattr - fill a secattr from a smack value 1511 * @smack: the smack value 1512 * @nlsp: where the result goes 1513 * 1514 * Casey says that CIPSO is good enough for now. 1515 * It can be used to effect. 1516 * It can also be abused to effect when necessary. 1517 * Appologies to the TSIG group in general and GW in particular. 1518 */ 1519 static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp) 1520 { 1521 struct smack_cipso cipso; 1522 int rc; 1523 1524 nlsp->domain = smack; 1525 nlsp->flags = NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; 1526 1527 rc = smack_to_cipso(smack, &cipso); 1528 if (rc == 0) { 1529 nlsp->attr.mls.lvl = cipso.smk_level; 1530 smack_set_catset(cipso.smk_catset, nlsp); 1531 } else { 1532 nlsp->attr.mls.lvl = smack_cipso_direct; 1533 smack_set_catset(smack, nlsp); 1534 } 1535 } 1536 1537 /** 1538 * smack_netlabel - Set the secattr on a socket 1539 * @sk: the socket 1540 * @labeled: socket label scheme 1541 * 1542 * Convert the outbound smack value (smk_out) to a 1543 * secattr and attach it to the socket. 1544 * 1545 * Returns 0 on success or an error code 1546 */ 1547 static int smack_netlabel(struct sock *sk, int labeled) 1548 { 1549 struct socket_smack *ssp = sk->sk_security; 1550 struct netlbl_lsm_secattr secattr; 1551 int rc = 0; 1552 1553 /* 1554 * Usually the netlabel code will handle changing the 1555 * packet labeling based on the label. 1556 * The case of a single label host is different, because 1557 * a single label host should never get a labeled packet 1558 * even though the label is usually associated with a packet 1559 * label. 1560 */ 1561 local_bh_disable(); 1562 bh_lock_sock_nested(sk); 1563 1564 if (ssp->smk_out == smack_net_ambient || 1565 labeled == SMACK_UNLABELED_SOCKET) 1566 netlbl_sock_delattr(sk); 1567 else { 1568 netlbl_secattr_init(&secattr); 1569 smack_to_secattr(ssp->smk_out, &secattr); 1570 rc = netlbl_sock_setattr(sk, sk->sk_family, &secattr); 1571 netlbl_secattr_destroy(&secattr); 1572 } 1573 1574 bh_unlock_sock(sk); 1575 local_bh_enable(); 1576 1577 return rc; 1578 } 1579 1580 /** 1581 * smack_netlbel_send - Set the secattr on a socket and perform access checks 1582 * @sk: the socket 1583 * @sap: the destination address 1584 * 1585 * Set the correct secattr for the given socket based on the destination 1586 * address and perform any outbound access checks needed. 1587 * 1588 * Returns 0 on success or an error code. 1589 * 1590 */ 1591 static int smack_netlabel_send(struct sock *sk, struct sockaddr_in *sap) 1592 { 1593 int rc; 1594 int sk_lbl; 1595 char *hostsp; 1596 struct socket_smack *ssp = sk->sk_security; 1597 struct smk_audit_info ad; 1598 1599 rcu_read_lock(); 1600 hostsp = smack_host_label(sap); 1601 if (hostsp != NULL) { 1602 sk_lbl = SMACK_UNLABELED_SOCKET; 1603 #ifdef CONFIG_AUDIT 1604 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); 1605 ad.a.u.net.family = sap->sin_family; 1606 ad.a.u.net.dport = sap->sin_port; 1607 ad.a.u.net.v4info.daddr = sap->sin_addr.s_addr; 1608 #endif 1609 rc = smk_access(ssp->smk_out, hostsp, MAY_WRITE, &ad); 1610 } else { 1611 sk_lbl = SMACK_CIPSO_SOCKET; 1612 rc = 0; 1613 } 1614 rcu_read_unlock(); 1615 if (rc != 0) 1616 return rc; 1617 1618 return smack_netlabel(sk, sk_lbl); 1619 } 1620 1621 /** 1622 * smack_inode_setsecurity - set smack xattrs 1623 * @inode: the object 1624 * @name: attribute name 1625 * @value: attribute value 1626 * @size: size of the attribute 1627 * @flags: unused 1628 * 1629 * Sets the named attribute in the appropriate blob 1630 * 1631 * Returns 0 on success, or an error code 1632 */ 1633 static int smack_inode_setsecurity(struct inode *inode, const char *name, 1634 const void *value, size_t size, int flags) 1635 { 1636 char *sp; 1637 struct inode_smack *nsp = inode->i_security; 1638 struct socket_smack *ssp; 1639 struct socket *sock; 1640 int rc = 0; 1641 1642 if (value == NULL || size > SMK_LABELLEN || size == 0) 1643 return -EACCES; 1644 1645 sp = smk_import(value, size); 1646 if (sp == NULL) 1647 return -EINVAL; 1648 1649 if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) { 1650 nsp->smk_inode = sp; 1651 nsp->smk_flags |= SMK_INODE_INSTANT; 1652 return 0; 1653 } 1654 /* 1655 * The rest of the Smack xattrs are only on sockets. 1656 */ 1657 if (inode->i_sb->s_magic != SOCKFS_MAGIC) 1658 return -EOPNOTSUPP; 1659 1660 sock = SOCKET_I(inode); 1661 if (sock == NULL || sock->sk == NULL) 1662 return -EOPNOTSUPP; 1663 1664 ssp = sock->sk->sk_security; 1665 1666 if (strcmp(name, XATTR_SMACK_IPIN) == 0) 1667 ssp->smk_in = sp; 1668 else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) { 1669 ssp->smk_out = sp; 1670 rc = smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); 1671 if (rc != 0) 1672 printk(KERN_WARNING "Smack: \"%s\" netlbl error %d.\n", 1673 __func__, -rc); 1674 } else 1675 return -EOPNOTSUPP; 1676 1677 return 0; 1678 } 1679 1680 /** 1681 * smack_socket_post_create - finish socket setup 1682 * @sock: the socket 1683 * @family: protocol family 1684 * @type: unused 1685 * @protocol: unused 1686 * @kern: unused 1687 * 1688 * Sets the netlabel information on the socket 1689 * 1690 * Returns 0 on success, and error code otherwise 1691 */ 1692 static int smack_socket_post_create(struct socket *sock, int family, 1693 int type, int protocol, int kern) 1694 { 1695 if (family != PF_INET || sock->sk == NULL) 1696 return 0; 1697 /* 1698 * Set the outbound netlbl. 1699 */ 1700 return smack_netlabel(sock->sk, SMACK_CIPSO_SOCKET); 1701 } 1702 1703 /** 1704 * smack_socket_connect - connect access check 1705 * @sock: the socket 1706 * @sap: the other end 1707 * @addrlen: size of sap 1708 * 1709 * Verifies that a connection may be possible 1710 * 1711 * Returns 0 on success, and error code otherwise 1712 */ 1713 static int smack_socket_connect(struct socket *sock, struct sockaddr *sap, 1714 int addrlen) 1715 { 1716 if (sock->sk == NULL || sock->sk->sk_family != PF_INET) 1717 return 0; 1718 if (addrlen < sizeof(struct sockaddr_in)) 1719 return -EINVAL; 1720 1721 return smack_netlabel_send(sock->sk, (struct sockaddr_in *)sap); 1722 } 1723 1724 /** 1725 * smack_flags_to_may - convert S_ to MAY_ values 1726 * @flags: the S_ value 1727 * 1728 * Returns the equivalent MAY_ value 1729 */ 1730 static int smack_flags_to_may(int flags) 1731 { 1732 int may = 0; 1733 1734 if (flags & S_IRUGO) 1735 may |= MAY_READ; 1736 if (flags & S_IWUGO) 1737 may |= MAY_WRITE; 1738 if (flags & S_IXUGO) 1739 may |= MAY_EXEC; 1740 1741 return may; 1742 } 1743 1744 /** 1745 * smack_msg_msg_alloc_security - Set the security blob for msg_msg 1746 * @msg: the object 1747 * 1748 * Returns 0 1749 */ 1750 static int smack_msg_msg_alloc_security(struct msg_msg *msg) 1751 { 1752 msg->security = current_security(); 1753 return 0; 1754 } 1755 1756 /** 1757 * smack_msg_msg_free_security - Clear the security blob for msg_msg 1758 * @msg: the object 1759 * 1760 * Clears the blob pointer 1761 */ 1762 static void smack_msg_msg_free_security(struct msg_msg *msg) 1763 { 1764 msg->security = NULL; 1765 } 1766 1767 /** 1768 * smack_of_shm - the smack pointer for the shm 1769 * @shp: the object 1770 * 1771 * Returns a pointer to the smack value 1772 */ 1773 static char *smack_of_shm(struct shmid_kernel *shp) 1774 { 1775 return (char *)shp->shm_perm.security; 1776 } 1777 1778 /** 1779 * smack_shm_alloc_security - Set the security blob for shm 1780 * @shp: the object 1781 * 1782 * Returns 0 1783 */ 1784 static int smack_shm_alloc_security(struct shmid_kernel *shp) 1785 { 1786 struct kern_ipc_perm *isp = &shp->shm_perm; 1787 1788 isp->security = current_security(); 1789 return 0; 1790 } 1791 1792 /** 1793 * smack_shm_free_security - Clear the security blob for shm 1794 * @shp: the object 1795 * 1796 * Clears the blob pointer 1797 */ 1798 static void smack_shm_free_security(struct shmid_kernel *shp) 1799 { 1800 struct kern_ipc_perm *isp = &shp->shm_perm; 1801 1802 isp->security = NULL; 1803 } 1804 1805 /** 1806 * smk_curacc_shm : check if current has access on shm 1807 * @shp : the object 1808 * @access : access requested 1809 * 1810 * Returns 0 if current has the requested access, error code otherwise 1811 */ 1812 static int smk_curacc_shm(struct shmid_kernel *shp, int access) 1813 { 1814 char *ssp = smack_of_shm(shp); 1815 struct smk_audit_info ad; 1816 1817 #ifdef CONFIG_AUDIT 1818 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); 1819 ad.a.u.ipc_id = shp->shm_perm.id; 1820 #endif 1821 return smk_curacc(ssp, access, &ad); 1822 } 1823 1824 /** 1825 * smack_shm_associate - Smack access check for shm 1826 * @shp: the object 1827 * @shmflg: access requested 1828 * 1829 * Returns 0 if current has the requested access, error code otherwise 1830 */ 1831 static int smack_shm_associate(struct shmid_kernel *shp, int shmflg) 1832 { 1833 int may; 1834 1835 may = smack_flags_to_may(shmflg); 1836 return smk_curacc_shm(shp, may); 1837 } 1838 1839 /** 1840 * smack_shm_shmctl - Smack access check for shm 1841 * @shp: the object 1842 * @cmd: what it wants to do 1843 * 1844 * Returns 0 if current has the requested access, error code otherwise 1845 */ 1846 static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd) 1847 { 1848 int may; 1849 1850 switch (cmd) { 1851 case IPC_STAT: 1852 case SHM_STAT: 1853 may = MAY_READ; 1854 break; 1855 case IPC_SET: 1856 case SHM_LOCK: 1857 case SHM_UNLOCK: 1858 case IPC_RMID: 1859 may = MAY_READWRITE; 1860 break; 1861 case IPC_INFO: 1862 case SHM_INFO: 1863 /* 1864 * System level information. 1865 */ 1866 return 0; 1867 default: 1868 return -EINVAL; 1869 } 1870 return smk_curacc_shm(shp, may); 1871 } 1872 1873 /** 1874 * smack_shm_shmat - Smack access for shmat 1875 * @shp: the object 1876 * @shmaddr: unused 1877 * @shmflg: access requested 1878 * 1879 * Returns 0 if current has the requested access, error code otherwise 1880 */ 1881 static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr, 1882 int shmflg) 1883 { 1884 int may; 1885 1886 may = smack_flags_to_may(shmflg); 1887 return smk_curacc_shm(shp, may); 1888 } 1889 1890 /** 1891 * smack_of_sem - the smack pointer for the sem 1892 * @sma: the object 1893 * 1894 * Returns a pointer to the smack value 1895 */ 1896 static char *smack_of_sem(struct sem_array *sma) 1897 { 1898 return (char *)sma->sem_perm.security; 1899 } 1900 1901 /** 1902 * smack_sem_alloc_security - Set the security blob for sem 1903 * @sma: the object 1904 * 1905 * Returns 0 1906 */ 1907 static int smack_sem_alloc_security(struct sem_array *sma) 1908 { 1909 struct kern_ipc_perm *isp = &sma->sem_perm; 1910 1911 isp->security = current_security(); 1912 return 0; 1913 } 1914 1915 /** 1916 * smack_sem_free_security - Clear the security blob for sem 1917 * @sma: the object 1918 * 1919 * Clears the blob pointer 1920 */ 1921 static void smack_sem_free_security(struct sem_array *sma) 1922 { 1923 struct kern_ipc_perm *isp = &sma->sem_perm; 1924 1925 isp->security = NULL; 1926 } 1927 1928 /** 1929 * smk_curacc_sem : check if current has access on sem 1930 * @sma : the object 1931 * @access : access requested 1932 * 1933 * Returns 0 if current has the requested access, error code otherwise 1934 */ 1935 static int smk_curacc_sem(struct sem_array *sma, int access) 1936 { 1937 char *ssp = smack_of_sem(sma); 1938 struct smk_audit_info ad; 1939 1940 #ifdef CONFIG_AUDIT 1941 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); 1942 ad.a.u.ipc_id = sma->sem_perm.id; 1943 #endif 1944 return smk_curacc(ssp, access, &ad); 1945 } 1946 1947 /** 1948 * smack_sem_associate - Smack access check for sem 1949 * @sma: the object 1950 * @semflg: access requested 1951 * 1952 * Returns 0 if current has the requested access, error code otherwise 1953 */ 1954 static int smack_sem_associate(struct sem_array *sma, int semflg) 1955 { 1956 int may; 1957 1958 may = smack_flags_to_may(semflg); 1959 return smk_curacc_sem(sma, may); 1960 } 1961 1962 /** 1963 * smack_sem_shmctl - Smack access check for sem 1964 * @sma: the object 1965 * @cmd: what it wants to do 1966 * 1967 * Returns 0 if current has the requested access, error code otherwise 1968 */ 1969 static int smack_sem_semctl(struct sem_array *sma, int cmd) 1970 { 1971 int may; 1972 1973 switch (cmd) { 1974 case GETPID: 1975 case GETNCNT: 1976 case GETZCNT: 1977 case GETVAL: 1978 case GETALL: 1979 case IPC_STAT: 1980 case SEM_STAT: 1981 may = MAY_READ; 1982 break; 1983 case SETVAL: 1984 case SETALL: 1985 case IPC_RMID: 1986 case IPC_SET: 1987 may = MAY_READWRITE; 1988 break; 1989 case IPC_INFO: 1990 case SEM_INFO: 1991 /* 1992 * System level information 1993 */ 1994 return 0; 1995 default: 1996 return -EINVAL; 1997 } 1998 1999 return smk_curacc_sem(sma, may); 2000 } 2001 2002 /** 2003 * smack_sem_semop - Smack checks of semaphore operations 2004 * @sma: the object 2005 * @sops: unused 2006 * @nsops: unused 2007 * @alter: unused 2008 * 2009 * Treated as read and write in all cases. 2010 * 2011 * Returns 0 if access is allowed, error code otherwise 2012 */ 2013 static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops, 2014 unsigned nsops, int alter) 2015 { 2016 return smk_curacc_sem(sma, MAY_READWRITE); 2017 } 2018 2019 /** 2020 * smack_msg_alloc_security - Set the security blob for msg 2021 * @msq: the object 2022 * 2023 * Returns 0 2024 */ 2025 static int smack_msg_queue_alloc_security(struct msg_queue *msq) 2026 { 2027 struct kern_ipc_perm *kisp = &msq->q_perm; 2028 2029 kisp->security = current_security(); 2030 return 0; 2031 } 2032 2033 /** 2034 * smack_msg_free_security - Clear the security blob for msg 2035 * @msq: the object 2036 * 2037 * Clears the blob pointer 2038 */ 2039 static void smack_msg_queue_free_security(struct msg_queue *msq) 2040 { 2041 struct kern_ipc_perm *kisp = &msq->q_perm; 2042 2043 kisp->security = NULL; 2044 } 2045 2046 /** 2047 * smack_of_msq - the smack pointer for the msq 2048 * @msq: the object 2049 * 2050 * Returns a pointer to the smack value 2051 */ 2052 static char *smack_of_msq(struct msg_queue *msq) 2053 { 2054 return (char *)msq->q_perm.security; 2055 } 2056 2057 /** 2058 * smk_curacc_msq : helper to check if current has access on msq 2059 * @msq : the msq 2060 * @access : access requested 2061 * 2062 * return 0 if current has access, error otherwise 2063 */ 2064 static int smk_curacc_msq(struct msg_queue *msq, int access) 2065 { 2066 char *msp = smack_of_msq(msq); 2067 struct smk_audit_info ad; 2068 2069 #ifdef CONFIG_AUDIT 2070 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); 2071 ad.a.u.ipc_id = msq->q_perm.id; 2072 #endif 2073 return smk_curacc(msp, access, &ad); 2074 } 2075 2076 /** 2077 * smack_msg_queue_associate - Smack access check for msg_queue 2078 * @msq: the object 2079 * @msqflg: access requested 2080 * 2081 * Returns 0 if current has the requested access, error code otherwise 2082 */ 2083 static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg) 2084 { 2085 int may; 2086 2087 may = smack_flags_to_may(msqflg); 2088 return smk_curacc_msq(msq, may); 2089 } 2090 2091 /** 2092 * smack_msg_queue_msgctl - Smack access check for msg_queue 2093 * @msq: the object 2094 * @cmd: what it wants to do 2095 * 2096 * Returns 0 if current has the requested access, error code otherwise 2097 */ 2098 static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd) 2099 { 2100 int may; 2101 2102 switch (cmd) { 2103 case IPC_STAT: 2104 case MSG_STAT: 2105 may = MAY_READ; 2106 break; 2107 case IPC_SET: 2108 case IPC_RMID: 2109 may = MAY_READWRITE; 2110 break; 2111 case IPC_INFO: 2112 case MSG_INFO: 2113 /* 2114 * System level information 2115 */ 2116 return 0; 2117 default: 2118 return -EINVAL; 2119 } 2120 2121 return smk_curacc_msq(msq, may); 2122 } 2123 2124 /** 2125 * smack_msg_queue_msgsnd - Smack access check for msg_queue 2126 * @msq: the object 2127 * @msg: unused 2128 * @msqflg: access requested 2129 * 2130 * Returns 0 if current has the requested access, error code otherwise 2131 */ 2132 static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, 2133 int msqflg) 2134 { 2135 int may; 2136 2137 may = smack_flags_to_may(msqflg); 2138 return smk_curacc_msq(msq, may); 2139 } 2140 2141 /** 2142 * smack_msg_queue_msgsnd - Smack access check for msg_queue 2143 * @msq: the object 2144 * @msg: unused 2145 * @target: unused 2146 * @type: unused 2147 * @mode: unused 2148 * 2149 * Returns 0 if current has read and write access, error code otherwise 2150 */ 2151 static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, 2152 struct task_struct *target, long type, int mode) 2153 { 2154 return smk_curacc_msq(msq, MAY_READWRITE); 2155 } 2156 2157 /** 2158 * smack_ipc_permission - Smack access for ipc_permission() 2159 * @ipp: the object permissions 2160 * @flag: access requested 2161 * 2162 * Returns 0 if current has read and write access, error code otherwise 2163 */ 2164 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) 2165 { 2166 char *isp = ipp->security; 2167 int may = smack_flags_to_may(flag); 2168 struct smk_audit_info ad; 2169 2170 #ifdef CONFIG_AUDIT 2171 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC); 2172 ad.a.u.ipc_id = ipp->id; 2173 #endif 2174 return smk_curacc(isp, may, &ad); 2175 } 2176 2177 /** 2178 * smack_ipc_getsecid - Extract smack security id 2179 * @ipp: the object permissions 2180 * @secid: where result will be saved 2181 */ 2182 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) 2183 { 2184 char *smack = ipp->security; 2185 2186 *secid = smack_to_secid(smack); 2187 } 2188 2189 /** 2190 * smack_d_instantiate - Make sure the blob is correct on an inode 2191 * @opt_dentry: dentry where inode will be attached 2192 * @inode: the object 2193 * 2194 * Set the inode's security blob if it hasn't been done already. 2195 */ 2196 static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) 2197 { 2198 struct super_block *sbp; 2199 struct superblock_smack *sbsp; 2200 struct inode_smack *isp; 2201 char *csp = current_security(); 2202 char *fetched; 2203 char *final; 2204 struct dentry *dp; 2205 2206 if (inode == NULL) 2207 return; 2208 2209 isp = inode->i_security; 2210 2211 mutex_lock(&isp->smk_lock); 2212 /* 2213 * If the inode is already instantiated 2214 * take the quick way out 2215 */ 2216 if (isp->smk_flags & SMK_INODE_INSTANT) 2217 goto unlockandout; 2218 2219 sbp = inode->i_sb; 2220 sbsp = sbp->s_security; 2221 /* 2222 * We're going to use the superblock default label 2223 * if there's no label on the file. 2224 */ 2225 final = sbsp->smk_default; 2226 2227 /* 2228 * If this is the root inode the superblock 2229 * may be in the process of initialization. 2230 * If that is the case use the root value out 2231 * of the superblock. 2232 */ 2233 if (opt_dentry->d_parent == opt_dentry) { 2234 isp->smk_inode = sbsp->smk_root; 2235 isp->smk_flags |= SMK_INODE_INSTANT; 2236 goto unlockandout; 2237 } 2238 2239 /* 2240 * This is pretty hackish. 2241 * Casey says that we shouldn't have to do 2242 * file system specific code, but it does help 2243 * with keeping it simple. 2244 */ 2245 switch (sbp->s_magic) { 2246 case SMACK_MAGIC: 2247 /* 2248 * Casey says that it's a little embarassing 2249 * that the smack file system doesn't do 2250 * extended attributes. 2251 */ 2252 final = smack_known_star.smk_known; 2253 break; 2254 case PIPEFS_MAGIC: 2255 /* 2256 * Casey says pipes are easy (?) 2257 */ 2258 final = smack_known_star.smk_known; 2259 break; 2260 case DEVPTS_SUPER_MAGIC: 2261 /* 2262 * devpts seems content with the label of the task. 2263 * Programs that change smack have to treat the 2264 * pty with respect. 2265 */ 2266 final = csp; 2267 break; 2268 case SOCKFS_MAGIC: 2269 /* 2270 * Casey says sockets get the smack of the task. 2271 */ 2272 final = csp; 2273 break; 2274 case PROC_SUPER_MAGIC: 2275 /* 2276 * Casey says procfs appears not to care. 2277 * The superblock default suffices. 2278 */ 2279 break; 2280 case TMPFS_MAGIC: 2281 /* 2282 * Device labels should come from the filesystem, 2283 * but watch out, because they're volitile, 2284 * getting recreated on every reboot. 2285 */ 2286 final = smack_known_star.smk_known; 2287 /* 2288 * No break. 2289 * 2290 * If a smack value has been set we want to use it, 2291 * but since tmpfs isn't giving us the opportunity 2292 * to set mount options simulate setting the 2293 * superblock default. 2294 */ 2295 default: 2296 /* 2297 * This isn't an understood special case. 2298 * Get the value from the xattr. 2299 * 2300 * No xattr support means, alas, no SMACK label. 2301 * Use the aforeapplied default. 2302 * It would be curious if the label of the task 2303 * does not match that assigned. 2304 */ 2305 if (inode->i_op->getxattr == NULL) 2306 break; 2307 /* 2308 * Get the dentry for xattr. 2309 */ 2310 dp = dget(opt_dentry); 2311 fetched = smk_fetch(inode, dp); 2312 if (fetched != NULL) 2313 final = fetched; 2314 dput(dp); 2315 break; 2316 } 2317 2318 if (final == NULL) 2319 isp->smk_inode = csp; 2320 else 2321 isp->smk_inode = final; 2322 2323 isp->smk_flags |= SMK_INODE_INSTANT; 2324 2325 unlockandout: 2326 mutex_unlock(&isp->smk_lock); 2327 return; 2328 } 2329 2330 /** 2331 * smack_getprocattr - Smack process attribute access 2332 * @p: the object task 2333 * @name: the name of the attribute in /proc/.../attr 2334 * @value: where to put the result 2335 * 2336 * Places a copy of the task Smack into value 2337 * 2338 * Returns the length of the smack label or an error code 2339 */ 2340 static int smack_getprocattr(struct task_struct *p, char *name, char **value) 2341 { 2342 char *cp; 2343 int slen; 2344 2345 if (strcmp(name, "current") != 0) 2346 return -EINVAL; 2347 2348 cp = kstrdup(task_security(p), GFP_KERNEL); 2349 if (cp == NULL) 2350 return -ENOMEM; 2351 2352 slen = strlen(cp); 2353 *value = cp; 2354 return slen; 2355 } 2356 2357 /** 2358 * smack_setprocattr - Smack process attribute setting 2359 * @p: the object task 2360 * @name: the name of the attribute in /proc/.../attr 2361 * @value: the value to set 2362 * @size: the size of the value 2363 * 2364 * Sets the Smack value of the task. Only setting self 2365 * is permitted and only with privilege 2366 * 2367 * Returns the length of the smack label or an error code 2368 */ 2369 static int smack_setprocattr(struct task_struct *p, char *name, 2370 void *value, size_t size) 2371 { 2372 struct cred *new; 2373 char *newsmack; 2374 2375 /* 2376 * Changing another process' Smack value is too dangerous 2377 * and supports no sane use case. 2378 */ 2379 if (p != current) 2380 return -EPERM; 2381 2382 if (!capable(CAP_MAC_ADMIN)) 2383 return -EPERM; 2384 2385 if (value == NULL || size == 0 || size >= SMK_LABELLEN) 2386 return -EINVAL; 2387 2388 if (strcmp(name, "current") != 0) 2389 return -EINVAL; 2390 2391 newsmack = smk_import(value, size); 2392 if (newsmack == NULL) 2393 return -EINVAL; 2394 2395 /* 2396 * No process is ever allowed the web ("@") label. 2397 */ 2398 if (newsmack == smack_known_web.smk_known) 2399 return -EPERM; 2400 2401 new = prepare_creds(); 2402 if (new == NULL) 2403 return -ENOMEM; 2404 new->security = newsmack; 2405 commit_creds(new); 2406 return size; 2407 } 2408 2409 /** 2410 * smack_unix_stream_connect - Smack access on UDS 2411 * @sock: one sock 2412 * @other: the other sock 2413 * @newsk: unused 2414 * 2415 * Return 0 if a subject with the smack of sock could access 2416 * an object with the smack of other, otherwise an error code 2417 */ 2418 static int smack_unix_stream_connect(struct sock *sock, 2419 struct sock *other, struct sock *newsk) 2420 { 2421 struct inode *sp = SOCK_INODE(sock->sk_socket); 2422 struct inode *op = SOCK_INODE(other->sk_socket); 2423 struct smk_audit_info ad; 2424 2425 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); 2426 smk_ad_setfield_u_net_sk(&ad, other); 2427 return smk_access(smk_of_inode(sp), smk_of_inode(op), 2428 MAY_READWRITE, &ad); 2429 } 2430 2431 /** 2432 * smack_unix_may_send - Smack access on UDS 2433 * @sock: one socket 2434 * @other: the other socket 2435 * 2436 * Return 0 if a subject with the smack of sock could access 2437 * an object with the smack of other, otherwise an error code 2438 */ 2439 static int smack_unix_may_send(struct socket *sock, struct socket *other) 2440 { 2441 struct inode *sp = SOCK_INODE(sock); 2442 struct inode *op = SOCK_INODE(other); 2443 struct smk_audit_info ad; 2444 2445 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); 2446 smk_ad_setfield_u_net_sk(&ad, other->sk); 2447 return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE, &ad); 2448 } 2449 2450 /** 2451 * smack_socket_sendmsg - Smack check based on destination host 2452 * @sock: the socket 2453 * @msg: the message 2454 * @size: the size of the message 2455 * 2456 * Return 0 if the current subject can write to the destination 2457 * host. This is only a question if the destination is a single 2458 * label host. 2459 */ 2460 static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg, 2461 int size) 2462 { 2463 struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name; 2464 2465 /* 2466 * Perfectly reasonable for this to be NULL 2467 */ 2468 if (sip == NULL || sip->sin_family != AF_INET) 2469 return 0; 2470 2471 return smack_netlabel_send(sock->sk, sip); 2472 } 2473 2474 2475 /** 2476 * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat pair to smack 2477 * @sap: netlabel secattr 2478 * @sip: where to put the result 2479 * 2480 * Copies a smack label into sip 2481 */ 2482 static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip) 2483 { 2484 char smack[SMK_LABELLEN]; 2485 char *sp; 2486 int pcat; 2487 2488 if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) { 2489 /* 2490 * Looks like a CIPSO packet. 2491 * If there are flags but no level netlabel isn't 2492 * behaving the way we expect it to. 2493 * 2494 * Get the categories, if any 2495 * Without guidance regarding the smack value 2496 * for the packet fall back on the network 2497 * ambient value. 2498 */ 2499 memset(smack, '\0', SMK_LABELLEN); 2500 if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0) 2501 for (pcat = -1;;) { 2502 pcat = netlbl_secattr_catmap_walk( 2503 sap->attr.mls.cat, pcat + 1); 2504 if (pcat < 0) 2505 break; 2506 smack_catset_bit(pcat, smack); 2507 } 2508 /* 2509 * If it is CIPSO using smack direct mapping 2510 * we are already done. WeeHee. 2511 */ 2512 if (sap->attr.mls.lvl == smack_cipso_direct) { 2513 memcpy(sip, smack, SMK_MAXLEN); 2514 return; 2515 } 2516 /* 2517 * Look it up in the supplied table if it is not 2518 * a direct mapping. 2519 */ 2520 smack_from_cipso(sap->attr.mls.lvl, smack, sip); 2521 return; 2522 } 2523 if ((sap->flags & NETLBL_SECATTR_SECID) != 0) { 2524 /* 2525 * Looks like a fallback, which gives us a secid. 2526 */ 2527 sp = smack_from_secid(sap->attr.secid); 2528 /* 2529 * This has got to be a bug because it is 2530 * impossible to specify a fallback without 2531 * specifying the label, which will ensure 2532 * it has a secid, and the only way to get a 2533 * secid is from a fallback. 2534 */ 2535 BUG_ON(sp == NULL); 2536 strncpy(sip, sp, SMK_MAXLEN); 2537 return; 2538 } 2539 /* 2540 * Without guidance regarding the smack value 2541 * for the packet fall back on the network 2542 * ambient value. 2543 */ 2544 strncpy(sip, smack_net_ambient, SMK_MAXLEN); 2545 return; 2546 } 2547 2548 /** 2549 * smack_socket_sock_rcv_skb - Smack packet delivery access check 2550 * @sk: socket 2551 * @skb: packet 2552 * 2553 * Returns 0 if the packet should be delivered, an error code otherwise 2554 */ 2555 static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) 2556 { 2557 struct netlbl_lsm_secattr secattr; 2558 struct socket_smack *ssp = sk->sk_security; 2559 char smack[SMK_LABELLEN]; 2560 char *csp; 2561 int rc; 2562 struct smk_audit_info ad; 2563 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) 2564 return 0; 2565 2566 /* 2567 * Translate what netlabel gave us. 2568 */ 2569 netlbl_secattr_init(&secattr); 2570 2571 rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr); 2572 if (rc == 0) { 2573 smack_from_secattr(&secattr, smack); 2574 csp = smack; 2575 } else 2576 csp = smack_net_ambient; 2577 2578 netlbl_secattr_destroy(&secattr); 2579 2580 #ifdef CONFIG_AUDIT 2581 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); 2582 ad.a.u.net.family = sk->sk_family; 2583 ad.a.u.net.netif = skb->skb_iif; 2584 ipv4_skb_to_auditdata(skb, &ad.a, NULL); 2585 #endif 2586 /* 2587 * Receiving a packet requires that the other end 2588 * be able to write here. Read access is not required. 2589 * This is the simplist possible security model 2590 * for networking. 2591 */ 2592 rc = smk_access(csp, ssp->smk_in, MAY_WRITE, &ad); 2593 if (rc != 0) 2594 netlbl_skbuff_err(skb, rc, 0); 2595 return rc; 2596 } 2597 2598 /** 2599 * smack_socket_getpeersec_stream - pull in packet label 2600 * @sock: the socket 2601 * @optval: user's destination 2602 * @optlen: size thereof 2603 * @len: max thereof 2604 * 2605 * returns zero on success, an error code otherwise 2606 */ 2607 static int smack_socket_getpeersec_stream(struct socket *sock, 2608 char __user *optval, 2609 int __user *optlen, unsigned len) 2610 { 2611 struct socket_smack *ssp; 2612 int slen; 2613 int rc = 0; 2614 2615 ssp = sock->sk->sk_security; 2616 slen = strlen(ssp->smk_packet) + 1; 2617 2618 if (slen > len) 2619 rc = -ERANGE; 2620 else if (copy_to_user(optval, ssp->smk_packet, slen) != 0) 2621 rc = -EFAULT; 2622 2623 if (put_user(slen, optlen) != 0) 2624 rc = -EFAULT; 2625 2626 return rc; 2627 } 2628 2629 2630 /** 2631 * smack_socket_getpeersec_dgram - pull in packet label 2632 * @sock: the socket 2633 * @skb: packet data 2634 * @secid: pointer to where to put the secid of the packet 2635 * 2636 * Sets the netlabel socket state on sk from parent 2637 */ 2638 static int smack_socket_getpeersec_dgram(struct socket *sock, 2639 struct sk_buff *skb, u32 *secid) 2640 2641 { 2642 struct netlbl_lsm_secattr secattr; 2643 struct sock *sk; 2644 char smack[SMK_LABELLEN]; 2645 int family = PF_INET; 2646 u32 s; 2647 int rc; 2648 2649 /* 2650 * Only works for families with packets. 2651 */ 2652 if (sock != NULL) { 2653 sk = sock->sk; 2654 if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) 2655 return 0; 2656 family = sk->sk_family; 2657 } 2658 /* 2659 * Translate what netlabel gave us. 2660 */ 2661 netlbl_secattr_init(&secattr); 2662 rc = netlbl_skbuff_getattr(skb, family, &secattr); 2663 if (rc == 0) 2664 smack_from_secattr(&secattr, smack); 2665 netlbl_secattr_destroy(&secattr); 2666 2667 /* 2668 * Give up if we couldn't get anything 2669 */ 2670 if (rc != 0) 2671 return rc; 2672 2673 s = smack_to_secid(smack); 2674 if (s == 0) 2675 return -EINVAL; 2676 2677 *secid = s; 2678 return 0; 2679 } 2680 2681 /** 2682 * smack_sock_graft - Initialize a newly created socket with an existing sock 2683 * @sk: child sock 2684 * @parent: parent socket 2685 * 2686 * Set the smk_{in,out} state of an existing sock based on the process that 2687 * is creating the new socket. 2688 */ 2689 static void smack_sock_graft(struct sock *sk, struct socket *parent) 2690 { 2691 struct socket_smack *ssp; 2692 2693 if (sk == NULL || 2694 (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)) 2695 return; 2696 2697 ssp = sk->sk_security; 2698 ssp->smk_in = ssp->smk_out = current_security(); 2699 /* cssp->smk_packet is already set in smack_inet_csk_clone() */ 2700 } 2701 2702 /** 2703 * smack_inet_conn_request - Smack access check on connect 2704 * @sk: socket involved 2705 * @skb: packet 2706 * @req: unused 2707 * 2708 * Returns 0 if a task with the packet label could write to 2709 * the socket, otherwise an error code 2710 */ 2711 static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb, 2712 struct request_sock *req) 2713 { 2714 u16 family = sk->sk_family; 2715 struct socket_smack *ssp = sk->sk_security; 2716 struct netlbl_lsm_secattr secattr; 2717 struct sockaddr_in addr; 2718 struct iphdr *hdr; 2719 char smack[SMK_LABELLEN]; 2720 int rc; 2721 struct smk_audit_info ad; 2722 2723 /* handle mapped IPv4 packets arriving via IPv6 sockets */ 2724 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) 2725 family = PF_INET; 2726 2727 netlbl_secattr_init(&secattr); 2728 rc = netlbl_skbuff_getattr(skb, family, &secattr); 2729 if (rc == 0) 2730 smack_from_secattr(&secattr, smack); 2731 else 2732 strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN); 2733 netlbl_secattr_destroy(&secattr); 2734 2735 #ifdef CONFIG_AUDIT 2736 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NET); 2737 ad.a.u.net.family = family; 2738 ad.a.u.net.netif = skb->skb_iif; 2739 ipv4_skb_to_auditdata(skb, &ad.a, NULL); 2740 #endif 2741 /* 2742 * Receiving a packet requires that the other end be able to write 2743 * here. Read access is not required. 2744 */ 2745 rc = smk_access(smack, ssp->smk_in, MAY_WRITE, &ad); 2746 if (rc != 0) 2747 return rc; 2748 2749 /* 2750 * Save the peer's label in the request_sock so we can later setup 2751 * smk_packet in the child socket so that SO_PEERCRED can report it. 2752 */ 2753 req->peer_secid = smack_to_secid(smack); 2754 2755 /* 2756 * We need to decide if we want to label the incoming connection here 2757 * if we do we only need to label the request_sock and the stack will 2758 * propogate the wire-label to the sock when it is created. 2759 */ 2760 hdr = ip_hdr(skb); 2761 addr.sin_addr.s_addr = hdr->saddr; 2762 rcu_read_lock(); 2763 if (smack_host_label(&addr) == NULL) { 2764 rcu_read_unlock(); 2765 netlbl_secattr_init(&secattr); 2766 smack_to_secattr(smack, &secattr); 2767 rc = netlbl_req_setattr(req, &secattr); 2768 netlbl_secattr_destroy(&secattr); 2769 } else { 2770 rcu_read_unlock(); 2771 netlbl_req_delattr(req); 2772 } 2773 2774 return rc; 2775 } 2776 2777 /** 2778 * smack_inet_csk_clone - Copy the connection information to the new socket 2779 * @sk: the new socket 2780 * @req: the connection's request_sock 2781 * 2782 * Transfer the connection's peer label to the newly created socket. 2783 */ 2784 static void smack_inet_csk_clone(struct sock *sk, 2785 const struct request_sock *req) 2786 { 2787 struct socket_smack *ssp = sk->sk_security; 2788 char *smack; 2789 2790 if (req->peer_secid != 0) { 2791 smack = smack_from_secid(req->peer_secid); 2792 strncpy(ssp->smk_packet, smack, SMK_MAXLEN); 2793 } else 2794 ssp->smk_packet[0] = '\0'; 2795 } 2796 2797 /* 2798 * Key management security hooks 2799 * 2800 * Casey has not tested key support very heavily. 2801 * The permission check is most likely too restrictive. 2802 * If you care about keys please have a look. 2803 */ 2804 #ifdef CONFIG_KEYS 2805 2806 /** 2807 * smack_key_alloc - Set the key security blob 2808 * @key: object 2809 * @cred: the credentials to use 2810 * @flags: unused 2811 * 2812 * No allocation required 2813 * 2814 * Returns 0 2815 */ 2816 static int smack_key_alloc(struct key *key, const struct cred *cred, 2817 unsigned long flags) 2818 { 2819 key->security = cred->security; 2820 return 0; 2821 } 2822 2823 /** 2824 * smack_key_free - Clear the key security blob 2825 * @key: the object 2826 * 2827 * Clear the blob pointer 2828 */ 2829 static void smack_key_free(struct key *key) 2830 { 2831 key->security = NULL; 2832 } 2833 2834 /* 2835 * smack_key_permission - Smack access on a key 2836 * @key_ref: gets to the object 2837 * @cred: the credentials to use 2838 * @perm: unused 2839 * 2840 * Return 0 if the task has read and write to the object, 2841 * an error code otherwise 2842 */ 2843 static int smack_key_permission(key_ref_t key_ref, 2844 const struct cred *cred, key_perm_t perm) 2845 { 2846 struct key *keyp; 2847 struct smk_audit_info ad; 2848 2849 keyp = key_ref_to_ptr(key_ref); 2850 if (keyp == NULL) 2851 return -EINVAL; 2852 /* 2853 * If the key hasn't been initialized give it access so that 2854 * it may do so. 2855 */ 2856 if (keyp->security == NULL) 2857 return 0; 2858 /* 2859 * This should not occur 2860 */ 2861 if (cred->security == NULL) 2862 return -EACCES; 2863 #ifdef CONFIG_AUDIT 2864 smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY); 2865 ad.a.u.key_struct.key = keyp->serial; 2866 ad.a.u.key_struct.key_desc = keyp->description; 2867 #endif 2868 return smk_access(cred->security, keyp->security, 2869 MAY_READWRITE, &ad); 2870 } 2871 #endif /* CONFIG_KEYS */ 2872 2873 /* 2874 * Smack Audit hooks 2875 * 2876 * Audit requires a unique representation of each Smack specific 2877 * rule. This unique representation is used to distinguish the 2878 * object to be audited from remaining kernel objects and also 2879 * works as a glue between the audit hooks. 2880 * 2881 * Since repository entries are added but never deleted, we'll use 2882 * the smack_known label address related to the given audit rule as 2883 * the needed unique representation. This also better fits the smack 2884 * model where nearly everything is a label. 2885 */ 2886 #ifdef CONFIG_AUDIT 2887 2888 /** 2889 * smack_audit_rule_init - Initialize a smack audit rule 2890 * @field: audit rule fields given from user-space (audit.h) 2891 * @op: required testing operator (=, !=, >, <, ...) 2892 * @rulestr: smack label to be audited 2893 * @vrule: pointer to save our own audit rule representation 2894 * 2895 * Prepare to audit cases where (@field @op @rulestr) is true. 2896 * The label to be audited is created if necessay. 2897 */ 2898 static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) 2899 { 2900 char **rule = (char **)vrule; 2901 *rule = NULL; 2902 2903 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) 2904 return -EINVAL; 2905 2906 if (op != Audit_equal && op != Audit_not_equal) 2907 return -EINVAL; 2908 2909 *rule = smk_import(rulestr, 0); 2910 2911 return 0; 2912 } 2913 2914 /** 2915 * smack_audit_rule_known - Distinguish Smack audit rules 2916 * @krule: rule of interest, in Audit kernel representation format 2917 * 2918 * This is used to filter Smack rules from remaining Audit ones. 2919 * If it's proved that this rule belongs to us, the 2920 * audit_rule_match hook will be called to do the final judgement. 2921 */ 2922 static int smack_audit_rule_known(struct audit_krule *krule) 2923 { 2924 struct audit_field *f; 2925 int i; 2926 2927 for (i = 0; i < krule->field_count; i++) { 2928 f = &krule->fields[i]; 2929 2930 if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER) 2931 return 1; 2932 } 2933 2934 return 0; 2935 } 2936 2937 /** 2938 * smack_audit_rule_match - Audit given object ? 2939 * @secid: security id for identifying the object to test 2940 * @field: audit rule flags given from user-space 2941 * @op: required testing operator 2942 * @vrule: smack internal rule presentation 2943 * @actx: audit context associated with the check 2944 * 2945 * The core Audit hook. It's used to take the decision of 2946 * whether to audit or not to audit a given object. 2947 */ 2948 static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule, 2949 struct audit_context *actx) 2950 { 2951 char *smack; 2952 char *rule = vrule; 2953 2954 if (!rule) { 2955 audit_log(actx, GFP_KERNEL, AUDIT_SELINUX_ERR, 2956 "Smack: missing rule\n"); 2957 return -ENOENT; 2958 } 2959 2960 if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER) 2961 return 0; 2962 2963 smack = smack_from_secid(secid); 2964 2965 /* 2966 * No need to do string comparisons. If a match occurs, 2967 * both pointers will point to the same smack_known 2968 * label. 2969 */ 2970 if (op == Audit_equal) 2971 return (rule == smack); 2972 if (op == Audit_not_equal) 2973 return (rule != smack); 2974 2975 return 0; 2976 } 2977 2978 /** 2979 * smack_audit_rule_free - free smack rule representation 2980 * @vrule: rule to be freed. 2981 * 2982 * No memory was allocated. 2983 */ 2984 static void smack_audit_rule_free(void *vrule) 2985 { 2986 /* No-op */ 2987 } 2988 2989 #endif /* CONFIG_AUDIT */ 2990 2991 /** 2992 * smack_secid_to_secctx - return the smack label for a secid 2993 * @secid: incoming integer 2994 * @secdata: destination 2995 * @seclen: how long it is 2996 * 2997 * Exists for networking code. 2998 */ 2999 static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) 3000 { 3001 char *sp = smack_from_secid(secid); 3002 3003 if (secdata) 3004 *secdata = sp; 3005 *seclen = strlen(sp); 3006 return 0; 3007 } 3008 3009 /** 3010 * smack_secctx_to_secid - return the secid for a smack label 3011 * @secdata: smack label 3012 * @seclen: how long result is 3013 * @secid: outgoing integer 3014 * 3015 * Exists for audit and networking code. 3016 */ 3017 static int smack_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) 3018 { 3019 *secid = smack_to_secid(secdata); 3020 return 0; 3021 } 3022 3023 /** 3024 * smack_release_secctx - don't do anything. 3025 * @secdata: unused 3026 * @seclen: unused 3027 * 3028 * Exists to make sure nothing gets done, and properly 3029 */ 3030 static void smack_release_secctx(char *secdata, u32 seclen) 3031 { 3032 } 3033 3034 static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) 3035 { 3036 return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx, ctxlen, 0); 3037 } 3038 3039 static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) 3040 { 3041 return __vfs_setxattr_noperm(dentry, XATTR_NAME_SMACK, ctx, ctxlen, 0); 3042 } 3043 3044 static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) 3045 { 3046 int len = 0; 3047 len = smack_inode_getsecurity(inode, XATTR_SMACK_SUFFIX, ctx, true); 3048 3049 if (len < 0) 3050 return len; 3051 *ctxlen = len; 3052 return 0; 3053 } 3054 3055 struct security_operations smack_ops = { 3056 .name = "smack", 3057 3058 .ptrace_access_check = smack_ptrace_access_check, 3059 .ptrace_traceme = smack_ptrace_traceme, 3060 .syslog = smack_syslog, 3061 3062 .sb_alloc_security = smack_sb_alloc_security, 3063 .sb_free_security = smack_sb_free_security, 3064 .sb_copy_data = smack_sb_copy_data, 3065 .sb_kern_mount = smack_sb_kern_mount, 3066 .sb_statfs = smack_sb_statfs, 3067 .sb_mount = smack_sb_mount, 3068 .sb_umount = smack_sb_umount, 3069 3070 .inode_alloc_security = smack_inode_alloc_security, 3071 .inode_free_security = smack_inode_free_security, 3072 .inode_init_security = smack_inode_init_security, 3073 .inode_link = smack_inode_link, 3074 .inode_unlink = smack_inode_unlink, 3075 .inode_rmdir = smack_inode_rmdir, 3076 .inode_rename = smack_inode_rename, 3077 .inode_permission = smack_inode_permission, 3078 .inode_setattr = smack_inode_setattr, 3079 .inode_getattr = smack_inode_getattr, 3080 .inode_setxattr = smack_inode_setxattr, 3081 .inode_post_setxattr = smack_inode_post_setxattr, 3082 .inode_getxattr = smack_inode_getxattr, 3083 .inode_removexattr = smack_inode_removexattr, 3084 .inode_getsecurity = smack_inode_getsecurity, 3085 .inode_setsecurity = smack_inode_setsecurity, 3086 .inode_listsecurity = smack_inode_listsecurity, 3087 .inode_getsecid = smack_inode_getsecid, 3088 3089 .file_permission = smack_file_permission, 3090 .file_alloc_security = smack_file_alloc_security, 3091 .file_free_security = smack_file_free_security, 3092 .file_ioctl = smack_file_ioctl, 3093 .file_lock = smack_file_lock, 3094 .file_fcntl = smack_file_fcntl, 3095 .file_set_fowner = smack_file_set_fowner, 3096 .file_send_sigiotask = smack_file_send_sigiotask, 3097 .file_receive = smack_file_receive, 3098 3099 .cred_alloc_blank = smack_cred_alloc_blank, 3100 .cred_free = smack_cred_free, 3101 .cred_prepare = smack_cred_prepare, 3102 .cred_transfer = smack_cred_transfer, 3103 .kernel_act_as = smack_kernel_act_as, 3104 .kernel_create_files_as = smack_kernel_create_files_as, 3105 .task_setpgid = smack_task_setpgid, 3106 .task_getpgid = smack_task_getpgid, 3107 .task_getsid = smack_task_getsid, 3108 .task_getsecid = smack_task_getsecid, 3109 .task_setnice = smack_task_setnice, 3110 .task_setioprio = smack_task_setioprio, 3111 .task_getioprio = smack_task_getioprio, 3112 .task_setscheduler = smack_task_setscheduler, 3113 .task_getscheduler = smack_task_getscheduler, 3114 .task_movememory = smack_task_movememory, 3115 .task_kill = smack_task_kill, 3116 .task_wait = smack_task_wait, 3117 .task_to_inode = smack_task_to_inode, 3118 3119 .ipc_permission = smack_ipc_permission, 3120 .ipc_getsecid = smack_ipc_getsecid, 3121 3122 .msg_msg_alloc_security = smack_msg_msg_alloc_security, 3123 .msg_msg_free_security = smack_msg_msg_free_security, 3124 3125 .msg_queue_alloc_security = smack_msg_queue_alloc_security, 3126 .msg_queue_free_security = smack_msg_queue_free_security, 3127 .msg_queue_associate = smack_msg_queue_associate, 3128 .msg_queue_msgctl = smack_msg_queue_msgctl, 3129 .msg_queue_msgsnd = smack_msg_queue_msgsnd, 3130 .msg_queue_msgrcv = smack_msg_queue_msgrcv, 3131 3132 .shm_alloc_security = smack_shm_alloc_security, 3133 .shm_free_security = smack_shm_free_security, 3134 .shm_associate = smack_shm_associate, 3135 .shm_shmctl = smack_shm_shmctl, 3136 .shm_shmat = smack_shm_shmat, 3137 3138 .sem_alloc_security = smack_sem_alloc_security, 3139 .sem_free_security = smack_sem_free_security, 3140 .sem_associate = smack_sem_associate, 3141 .sem_semctl = smack_sem_semctl, 3142 .sem_semop = smack_sem_semop, 3143 3144 .d_instantiate = smack_d_instantiate, 3145 3146 .getprocattr = smack_getprocattr, 3147 .setprocattr = smack_setprocattr, 3148 3149 .unix_stream_connect = smack_unix_stream_connect, 3150 .unix_may_send = smack_unix_may_send, 3151 3152 .socket_post_create = smack_socket_post_create, 3153 .socket_connect = smack_socket_connect, 3154 .socket_sendmsg = smack_socket_sendmsg, 3155 .socket_sock_rcv_skb = smack_socket_sock_rcv_skb, 3156 .socket_getpeersec_stream = smack_socket_getpeersec_stream, 3157 .socket_getpeersec_dgram = smack_socket_getpeersec_dgram, 3158 .sk_alloc_security = smack_sk_alloc_security, 3159 .sk_free_security = smack_sk_free_security, 3160 .sock_graft = smack_sock_graft, 3161 .inet_conn_request = smack_inet_conn_request, 3162 .inet_csk_clone = smack_inet_csk_clone, 3163 3164 /* key management security hooks */ 3165 #ifdef CONFIG_KEYS 3166 .key_alloc = smack_key_alloc, 3167 .key_free = smack_key_free, 3168 .key_permission = smack_key_permission, 3169 #endif /* CONFIG_KEYS */ 3170 3171 /* Audit hooks */ 3172 #ifdef CONFIG_AUDIT 3173 .audit_rule_init = smack_audit_rule_init, 3174 .audit_rule_known = smack_audit_rule_known, 3175 .audit_rule_match = smack_audit_rule_match, 3176 .audit_rule_free = smack_audit_rule_free, 3177 #endif /* CONFIG_AUDIT */ 3178 3179 .secid_to_secctx = smack_secid_to_secctx, 3180 .secctx_to_secid = smack_secctx_to_secid, 3181 .release_secctx = smack_release_secctx, 3182 .inode_notifysecctx = smack_inode_notifysecctx, 3183 .inode_setsecctx = smack_inode_setsecctx, 3184 .inode_getsecctx = smack_inode_getsecctx, 3185 }; 3186 3187 3188 static __init void init_smack_know_list(void) 3189 { 3190 list_add(&smack_known_huh.list, &smack_known_list); 3191 list_add(&smack_known_hat.list, &smack_known_list); 3192 list_add(&smack_known_star.list, &smack_known_list); 3193 list_add(&smack_known_floor.list, &smack_known_list); 3194 list_add(&smack_known_invalid.list, &smack_known_list); 3195 list_add(&smack_known_web.list, &smack_known_list); 3196 } 3197 3198 /** 3199 * smack_init - initialize the smack system 3200 * 3201 * Returns 0 3202 */ 3203 static __init int smack_init(void) 3204 { 3205 struct cred *cred; 3206 3207 if (!security_module_enable(&smack_ops)) 3208 return 0; 3209 3210 printk(KERN_INFO "Smack: Initializing.\n"); 3211 3212 /* 3213 * Set the security state for the initial task. 3214 */ 3215 cred = (struct cred *) current->cred; 3216 cred->security = &smack_known_floor.smk_known; 3217 3218 /* initialize the smack_know_list */ 3219 init_smack_know_list(); 3220 /* 3221 * Initialize locks 3222 */ 3223 spin_lock_init(&smack_known_huh.smk_cipsolock); 3224 spin_lock_init(&smack_known_hat.smk_cipsolock); 3225 spin_lock_init(&smack_known_star.smk_cipsolock); 3226 spin_lock_init(&smack_known_floor.smk_cipsolock); 3227 spin_lock_init(&smack_known_invalid.smk_cipsolock); 3228 3229 /* 3230 * Register with LSM 3231 */ 3232 if (register_security(&smack_ops)) 3233 panic("smack: Unable to register with kernel.\n"); 3234 3235 return 0; 3236 } 3237 3238 /* 3239 * Smack requires early initialization in order to label 3240 * all processes and objects when they are created. 3241 */ 3242 security_initcall(smack_init); 3243