rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * AppArmor security module |
| 3 | * |
| 4 | * This file contains AppArmor LSM hooks. |
| 5 | * |
| 6 | * Copyright (C) 1998-2008 Novell/SUSE |
| 7 | * Copyright 2009-2010 Canonical Ltd. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation, version 2 of the |
| 12 | * License. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/lsm_hooks.h> |
| 16 | #include <linux/moduleparam.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/mman.h> |
| 19 | #include <linux/mount.h> |
| 20 | #include <linux/namei.h> |
| 21 | #include <linux/ptrace.h> |
| 22 | #include <linux/ctype.h> |
| 23 | #include <linux/sysctl.h> |
| 24 | #include <linux/audit.h> |
| 25 | #include <linux/user_namespace.h> |
| 26 | #include <linux/kmemleak.h> |
| 27 | #include <net/sock.h> |
| 28 | |
| 29 | #include "include/apparmor.h" |
| 30 | #include "include/apparmorfs.h" |
| 31 | #include "include/audit.h" |
| 32 | #include "include/capability.h" |
| 33 | #include "include/context.h" |
| 34 | #include "include/file.h" |
| 35 | #include "include/ipc.h" |
| 36 | #include "include/path.h" |
| 37 | #include "include/label.h" |
| 38 | #include "include/policy.h" |
| 39 | #include "include/policy_ns.h" |
| 40 | #include "include/procattr.h" |
| 41 | #include "include/mount.h" |
| 42 | |
| 43 | /* Flag indicating whether initialization completed */ |
| 44 | int apparmor_initialized; |
| 45 | |
| 46 | DEFINE_PER_CPU(struct aa_buffers, aa_buffers); |
| 47 | |
| 48 | |
| 49 | /* |
| 50 | * LSM hook functions |
| 51 | */ |
| 52 | |
| 53 | /* |
| 54 | * free the associated aa_task_ctx and put its labels |
| 55 | */ |
| 56 | static void apparmor_cred_free(struct cred *cred) |
| 57 | { |
| 58 | aa_free_task_context(cred_ctx(cred)); |
| 59 | cred_ctx(cred) = NULL; |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * allocate the apparmor part of blank credentials |
| 64 | */ |
| 65 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) |
| 66 | { |
| 67 | /* freed by apparmor_cred_free */ |
| 68 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
| 69 | |
| 70 | if (!ctx) |
| 71 | return -ENOMEM; |
| 72 | |
| 73 | cred_ctx(cred) = ctx; |
| 74 | return 0; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * prepare new aa_task_ctx for modification by prepare_cred block |
| 79 | */ |
| 80 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, |
| 81 | gfp_t gfp) |
| 82 | { |
| 83 | /* freed by apparmor_cred_free */ |
| 84 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
| 85 | |
| 86 | if (!ctx) |
| 87 | return -ENOMEM; |
| 88 | |
| 89 | aa_dup_task_context(ctx, cred_ctx(old)); |
| 90 | cred_ctx(new) = ctx; |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * transfer the apparmor data to a blank set of creds |
| 96 | */ |
| 97 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) |
| 98 | { |
| 99 | const struct aa_task_ctx *old_ctx = cred_ctx(old); |
| 100 | struct aa_task_ctx *new_ctx = cred_ctx(new); |
| 101 | |
| 102 | aa_dup_task_context(new_ctx, old_ctx); |
| 103 | } |
| 104 | |
| 105 | static int apparmor_ptrace_access_check(struct task_struct *child, |
| 106 | unsigned int mode) |
| 107 | { |
| 108 | struct aa_label *tracer, *tracee; |
| 109 | int error; |
| 110 | |
| 111 | tracer = __begin_current_label_crit_section(); |
| 112 | tracee = aa_get_task_label(child); |
| 113 | error = aa_may_ptrace(tracer, tracee, |
| 114 | mode == PTRACE_MODE_READ ? AA_PTRACE_READ : AA_PTRACE_TRACE); |
| 115 | aa_put_label(tracee); |
| 116 | __end_current_label_crit_section(tracer); |
| 117 | |
| 118 | return error; |
| 119 | } |
| 120 | |
| 121 | static int apparmor_ptrace_traceme(struct task_struct *parent) |
| 122 | { |
| 123 | struct aa_label *tracer, *tracee; |
| 124 | int error; |
| 125 | |
| 126 | tracee = __begin_current_label_crit_section(); |
| 127 | tracer = aa_get_task_label(parent); |
| 128 | error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE); |
| 129 | aa_put_label(tracer); |
| 130 | __end_current_label_crit_section(tracee); |
| 131 | |
| 132 | return error; |
| 133 | } |
| 134 | |
| 135 | /* Derived from security/commoncap.c:cap_capget */ |
| 136 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, |
| 137 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
| 138 | { |
| 139 | struct aa_label *label; |
| 140 | const struct cred *cred; |
| 141 | |
| 142 | rcu_read_lock(); |
| 143 | cred = __task_cred(target); |
| 144 | label = aa_get_newest_cred_label(cred); |
| 145 | |
| 146 | /* |
| 147 | * cap_capget is stacked ahead of this and will |
| 148 | * initialize effective and permitted. |
| 149 | */ |
| 150 | if (!unconfined(label)) { |
| 151 | struct aa_profile *profile; |
| 152 | struct label_it i; |
| 153 | |
| 154 | label_for_each_confined(i, label, profile) { |
| 155 | if (COMPLAIN_MODE(profile)) |
| 156 | continue; |
| 157 | *effective = cap_intersect(*effective, |
| 158 | profile->caps.allow); |
| 159 | *permitted = cap_intersect(*permitted, |
| 160 | profile->caps.allow); |
| 161 | } |
| 162 | } |
| 163 | rcu_read_unlock(); |
| 164 | aa_put_label(label); |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
| 170 | int cap, int audit) |
| 171 | { |
| 172 | struct aa_label *label; |
| 173 | int error = 0; |
| 174 | |
| 175 | label = aa_get_newest_cred_label(cred); |
| 176 | if (!unconfined(label)) |
| 177 | error = aa_capable(label, cap, audit); |
| 178 | aa_put_label(label); |
| 179 | |
| 180 | return error; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * common_perm - basic common permission check wrapper fn for paths |
| 185 | * @op: operation being checked |
| 186 | * @path: path to check permission of (NOT NULL) |
| 187 | * @mask: requested permissions mask |
| 188 | * @cond: conditional info for the permission request (NOT NULL) |
| 189 | * |
| 190 | * Returns: %0 else error code if error or permission denied |
| 191 | */ |
| 192 | static int common_perm(const char *op, const struct path *path, u32 mask, |
| 193 | struct path_cond *cond) |
| 194 | { |
| 195 | struct aa_label *label; |
| 196 | int error = 0; |
| 197 | |
| 198 | label = __begin_current_label_crit_section(); |
| 199 | if (!unconfined(label)) |
| 200 | error = aa_path_perm(op, label, path, 0, mask, cond); |
| 201 | __end_current_label_crit_section(label); |
| 202 | |
| 203 | return error; |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * common_perm_cond - common permission wrapper around inode cond |
| 208 | * @op: operation being checked |
| 209 | * @path: location to check (NOT NULL) |
| 210 | * @mask: requested permissions mask |
| 211 | * |
| 212 | * Returns: %0 else error code if error or permission denied |
| 213 | */ |
| 214 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
| 215 | { |
| 216 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
| 217 | d_backing_inode(path->dentry)->i_mode |
| 218 | }; |
| 219 | |
| 220 | if (!path_mediated_fs(path->dentry)) |
| 221 | return 0; |
| 222 | |
| 223 | return common_perm(op, path, mask, &cond); |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
| 228 | * @op: operation being checked |
| 229 | * @dir: directory of the dentry (NOT NULL) |
| 230 | * @dentry: dentry to check (NOT NULL) |
| 231 | * @mask: requested permissions mask |
| 232 | * @cond: conditional info for the permission request (NOT NULL) |
| 233 | * |
| 234 | * Returns: %0 else error code if error or permission denied |
| 235 | */ |
| 236 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
| 237 | struct dentry *dentry, u32 mask, |
| 238 | struct path_cond *cond) |
| 239 | { |
| 240 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
| 241 | |
| 242 | return common_perm(op, &path, mask, cond); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * common_perm_rm - common permission wrapper for operations doing rm |
| 247 | * @op: operation being checked |
| 248 | * @dir: directory that the dentry is in (NOT NULL) |
| 249 | * @dentry: dentry being rm'd (NOT NULL) |
| 250 | * @mask: requested permission mask |
| 251 | * |
| 252 | * Returns: %0 else error code if error or permission denied |
| 253 | */ |
| 254 | static int common_perm_rm(const char *op, const struct path *dir, |
| 255 | struct dentry *dentry, u32 mask) |
| 256 | { |
| 257 | struct inode *inode = d_backing_inode(dentry); |
| 258 | struct path_cond cond = { }; |
| 259 | |
| 260 | if (!inode || !path_mediated_fs(dentry)) |
| 261 | return 0; |
| 262 | |
| 263 | cond.uid = inode->i_uid; |
| 264 | cond.mode = inode->i_mode; |
| 265 | |
| 266 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); |
| 267 | } |
| 268 | |
| 269 | /** |
| 270 | * common_perm_create - common permission wrapper for operations doing create |
| 271 | * @op: operation being checked |
| 272 | * @dir: directory that dentry will be created in (NOT NULL) |
| 273 | * @dentry: dentry to create (NOT NULL) |
| 274 | * @mask: request permission mask |
| 275 | * @mode: created file mode |
| 276 | * |
| 277 | * Returns: %0 else error code if error or permission denied |
| 278 | */ |
| 279 | static int common_perm_create(const char *op, const struct path *dir, |
| 280 | struct dentry *dentry, u32 mask, umode_t mode) |
| 281 | { |
| 282 | struct path_cond cond = { current_fsuid(), mode }; |
| 283 | |
| 284 | if (!path_mediated_fs(dir->dentry)) |
| 285 | return 0; |
| 286 | |
| 287 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); |
| 288 | } |
| 289 | |
| 290 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
| 291 | { |
| 292 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); |
| 293 | } |
| 294 | |
| 295 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
| 296 | umode_t mode) |
| 297 | { |
| 298 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, |
| 299 | S_IFDIR); |
| 300 | } |
| 301 | |
| 302 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
| 303 | { |
| 304 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); |
| 305 | } |
| 306 | |
| 307 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
| 308 | umode_t mode, unsigned int dev) |
| 309 | { |
| 310 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); |
| 311 | } |
| 312 | |
| 313 | static int apparmor_path_truncate(const struct path *path) |
| 314 | { |
| 315 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
| 316 | } |
| 317 | |
| 318 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
| 319 | const char *old_name) |
| 320 | { |
| 321 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, |
| 322 | S_IFLNK); |
| 323 | } |
| 324 | |
| 325 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
| 326 | struct dentry *new_dentry) |
| 327 | { |
| 328 | struct aa_label *label; |
| 329 | int error = 0; |
| 330 | |
| 331 | if (!path_mediated_fs(old_dentry)) |
| 332 | return 0; |
| 333 | |
| 334 | label = begin_current_label_crit_section(); |
| 335 | if (!unconfined(label)) |
| 336 | error = aa_path_link(label, old_dentry, new_dir, new_dentry); |
| 337 | end_current_label_crit_section(label); |
| 338 | |
| 339 | return error; |
| 340 | } |
| 341 | |
| 342 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
| 343 | const struct path *new_dir, struct dentry *new_dentry) |
| 344 | { |
| 345 | struct aa_label *label; |
| 346 | int error = 0; |
| 347 | |
| 348 | if (!path_mediated_fs(old_dentry)) |
| 349 | return 0; |
| 350 | |
| 351 | label = begin_current_label_crit_section(); |
| 352 | if (!unconfined(label)) { |
| 353 | struct path old_path = { .mnt = old_dir->mnt, |
| 354 | .dentry = old_dentry }; |
| 355 | struct path new_path = { .mnt = new_dir->mnt, |
| 356 | .dentry = new_dentry }; |
| 357 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
| 358 | d_backing_inode(old_dentry)->i_mode |
| 359 | }; |
| 360 | |
| 361 | error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0, |
| 362 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
| 363 | AA_MAY_SETATTR | AA_MAY_DELETE, |
| 364 | &cond); |
| 365 | if (!error) |
| 366 | error = aa_path_perm(OP_RENAME_DEST, label, &new_path, |
| 367 | 0, MAY_WRITE | AA_MAY_SETATTR | |
| 368 | AA_MAY_CREATE, &cond); |
| 369 | |
| 370 | } |
| 371 | end_current_label_crit_section(label); |
| 372 | |
| 373 | return error; |
| 374 | } |
| 375 | |
| 376 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
| 377 | { |
| 378 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
| 379 | } |
| 380 | |
| 381 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
| 382 | { |
| 383 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
| 384 | } |
| 385 | |
| 386 | static int apparmor_inode_getattr(const struct path *path) |
| 387 | { |
| 388 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
| 389 | } |
| 390 | |
| 391 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
| 392 | { |
| 393 | struct aa_file_ctx *fctx = file_ctx(file); |
| 394 | struct aa_label *label; |
| 395 | int error = 0; |
| 396 | |
| 397 | if (!path_mediated_fs(file->f_path.dentry)) |
| 398 | return 0; |
| 399 | |
| 400 | /* If in exec, permission is handled by bprm hooks. |
| 401 | * Cache permissions granted by the previous exec check, with |
| 402 | * implicit read and executable mmap which are required to |
| 403 | * actually execute the image. |
| 404 | */ |
| 405 | if (current->in_execve) { |
| 406 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
| 407 | return 0; |
| 408 | } |
| 409 | |
| 410 | label = aa_get_newest_cred_label(cred); |
| 411 | if (!unconfined(label)) { |
| 412 | struct inode *inode = file_inode(file); |
| 413 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
| 414 | |
| 415 | error = aa_path_perm(OP_OPEN, label, &file->f_path, 0, |
| 416 | aa_map_file_to_perms(file), &cond); |
| 417 | /* todo cache full allowed permissions set and state */ |
| 418 | fctx->allow = aa_map_file_to_perms(file); |
| 419 | } |
| 420 | aa_put_label(label); |
| 421 | |
| 422 | return error; |
| 423 | } |
| 424 | |
| 425 | static int apparmor_file_alloc_security(struct file *file) |
| 426 | { |
| 427 | int error = 0; |
| 428 | |
| 429 | /* freed by apparmor_file_free_security */ |
| 430 | struct aa_label *label = begin_current_label_crit_section(); |
| 431 | file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL); |
| 432 | if (!file_ctx(file)) |
| 433 | error = -ENOMEM; |
| 434 | end_current_label_crit_section(label); |
| 435 | |
| 436 | return error; |
| 437 | } |
| 438 | |
| 439 | static void apparmor_file_free_security(struct file *file) |
| 440 | { |
| 441 | aa_free_file_ctx(file_ctx(file)); |
| 442 | } |
| 443 | |
| 444 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
| 445 | { |
| 446 | struct aa_label *label; |
| 447 | int error = 0; |
| 448 | |
| 449 | /* don't reaudit files closed during inheritance */ |
| 450 | if (file->f_path.dentry == aa_null.dentry) |
| 451 | return -EACCES; |
| 452 | |
| 453 | label = __begin_current_label_crit_section(); |
| 454 | error = aa_file_perm(op, label, file, mask); |
| 455 | __end_current_label_crit_section(label); |
| 456 | |
| 457 | return error; |
| 458 | } |
| 459 | |
| 460 | static int apparmor_file_receive(struct file *file) |
| 461 | { |
| 462 | return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file)); |
| 463 | } |
| 464 | |
| 465 | static int apparmor_file_permission(struct file *file, int mask) |
| 466 | { |
| 467 | return common_file_perm(OP_FPERM, file, mask); |
| 468 | } |
| 469 | |
| 470 | static int apparmor_file_lock(struct file *file, unsigned int cmd) |
| 471 | { |
| 472 | u32 mask = AA_MAY_LOCK; |
| 473 | |
| 474 | if (cmd == F_WRLCK) |
| 475 | mask |= MAY_WRITE; |
| 476 | |
| 477 | return common_file_perm(OP_FLOCK, file, mask); |
| 478 | } |
| 479 | |
| 480 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
| 481 | unsigned long flags) |
| 482 | { |
| 483 | int mask = 0; |
| 484 | |
| 485 | if (!file || !file_ctx(file)) |
| 486 | return 0; |
| 487 | |
| 488 | if (prot & PROT_READ) |
| 489 | mask |= MAY_READ; |
| 490 | /* |
| 491 | * Private mappings don't require write perms since they don't |
| 492 | * write back to the files |
| 493 | */ |
| 494 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) |
| 495 | mask |= MAY_WRITE; |
| 496 | if (prot & PROT_EXEC) |
| 497 | mask |= AA_EXEC_MMAP; |
| 498 | |
| 499 | return common_file_perm(op, file, mask); |
| 500 | } |
| 501 | |
| 502 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
| 503 | unsigned long prot, unsigned long flags) |
| 504 | { |
| 505 | return common_mmap(OP_FMMAP, file, prot, flags); |
| 506 | } |
| 507 | |
| 508 | static int apparmor_file_mprotect(struct vm_area_struct *vma, |
| 509 | unsigned long reqprot, unsigned long prot) |
| 510 | { |
| 511 | return common_mmap(OP_FMPROT, vma->vm_file, prot, |
| 512 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); |
| 513 | } |
| 514 | |
| 515 | static int apparmor_sb_mount(const char *dev_name, const struct path *path, |
| 516 | const char *type, unsigned long flags, void *data) |
| 517 | { |
| 518 | struct aa_label *label; |
| 519 | int error = 0; |
| 520 | |
| 521 | /* Discard magic */ |
| 522 | if ((flags & MS_MGC_MSK) == MS_MGC_VAL) |
| 523 | flags &= ~MS_MGC_MSK; |
| 524 | |
| 525 | flags &= ~AA_MS_IGNORE_MASK; |
| 526 | |
| 527 | label = __begin_current_label_crit_section(); |
| 528 | if (!unconfined(label)) { |
| 529 | if (flags & MS_REMOUNT) |
| 530 | error = aa_remount(label, path, flags, data); |
| 531 | else if (flags & MS_BIND) |
| 532 | error = aa_bind_mount(label, path, dev_name, flags); |
| 533 | else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | |
| 534 | MS_UNBINDABLE)) |
| 535 | error = aa_mount_change_type(label, path, flags); |
| 536 | else if (flags & MS_MOVE) |
| 537 | error = aa_move_mount(label, path, dev_name); |
| 538 | else |
| 539 | error = aa_new_mount(label, dev_name, path, type, |
| 540 | flags, data); |
| 541 | } |
| 542 | __end_current_label_crit_section(label); |
| 543 | |
| 544 | return error; |
| 545 | } |
| 546 | |
| 547 | static int apparmor_sb_umount(struct vfsmount *mnt, int flags) |
| 548 | { |
| 549 | struct aa_label *label; |
| 550 | int error = 0; |
| 551 | |
| 552 | label = __begin_current_label_crit_section(); |
| 553 | if (!unconfined(label)) |
| 554 | error = aa_umount(label, mnt, flags); |
| 555 | __end_current_label_crit_section(label); |
| 556 | |
| 557 | return error; |
| 558 | } |
| 559 | |
| 560 | static int apparmor_sb_pivotroot(const struct path *old_path, |
| 561 | const struct path *new_path) |
| 562 | { |
| 563 | struct aa_label *label; |
| 564 | int error = 0; |
| 565 | |
| 566 | label = aa_get_current_label(); |
| 567 | if (!unconfined(label)) |
| 568 | error = aa_pivotroot(label, old_path, new_path); |
| 569 | aa_put_label(label); |
| 570 | |
| 571 | return error; |
| 572 | } |
| 573 | |
| 574 | static int apparmor_getprocattr(struct task_struct *task, char *name, |
| 575 | char **value) |
| 576 | { |
| 577 | int error = -ENOENT; |
| 578 | /* released below */ |
| 579 | const struct cred *cred = get_task_cred(task); |
| 580 | struct aa_task_ctx *ctx = cred_ctx(cred); |
| 581 | struct aa_label *label = NULL; |
| 582 | |
| 583 | if (strcmp(name, "current") == 0) |
| 584 | label = aa_get_newest_label(ctx->label); |
| 585 | else if (strcmp(name, "prev") == 0 && ctx->previous) |
| 586 | label = aa_get_newest_label(ctx->previous); |
| 587 | else if (strcmp(name, "exec") == 0 && ctx->onexec) |
| 588 | label = aa_get_newest_label(ctx->onexec); |
| 589 | else |
| 590 | error = -EINVAL; |
| 591 | |
| 592 | if (label) |
| 593 | error = aa_getprocattr(label, value); |
| 594 | |
| 595 | aa_put_label(label); |
| 596 | put_cred(cred); |
| 597 | |
| 598 | return error; |
| 599 | } |
| 600 | |
| 601 | static int apparmor_setprocattr(const char *name, void *value, |
| 602 | size_t size) |
| 603 | { |
| 604 | char *command, *largs = NULL, *args = value; |
| 605 | size_t arg_size; |
| 606 | int error; |
| 607 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
| 608 | |
| 609 | if (size == 0) |
| 610 | return -EINVAL; |
| 611 | |
| 612 | /* AppArmor requires that the buffer must be null terminated atm */ |
| 613 | if (args[size - 1] != '\0') { |
| 614 | /* null terminate */ |
| 615 | largs = args = kmalloc(size + 1, GFP_KERNEL); |
| 616 | if (!args) |
| 617 | return -ENOMEM; |
| 618 | memcpy(args, value, size); |
| 619 | args[size] = '\0'; |
| 620 | } |
| 621 | |
| 622 | error = -EINVAL; |
| 623 | args = strim(args); |
| 624 | command = strsep(&args, " "); |
| 625 | if (!args) |
| 626 | goto out; |
| 627 | args = skip_spaces(args); |
| 628 | if (!*args) |
| 629 | goto out; |
| 630 | |
| 631 | arg_size = size - (args - (largs ? largs : (char *) value)); |
| 632 | if (strcmp(name, "current") == 0) { |
| 633 | if (strcmp(command, "changehat") == 0) { |
| 634 | error = aa_setprocattr_changehat(args, arg_size, |
| 635 | AA_CHANGE_NOFLAGS); |
| 636 | } else if (strcmp(command, "permhat") == 0) { |
| 637 | error = aa_setprocattr_changehat(args, arg_size, |
| 638 | AA_CHANGE_TEST); |
| 639 | } else if (strcmp(command, "changeprofile") == 0) { |
| 640 | error = aa_change_profile(args, AA_CHANGE_NOFLAGS); |
| 641 | } else if (strcmp(command, "permprofile") == 0) { |
| 642 | error = aa_change_profile(args, AA_CHANGE_TEST); |
| 643 | } else if (strcmp(command, "stack") == 0) { |
| 644 | error = aa_change_profile(args, AA_CHANGE_STACK); |
| 645 | } else |
| 646 | goto fail; |
| 647 | } else if (strcmp(name, "exec") == 0) { |
| 648 | if (strcmp(command, "exec") == 0) |
| 649 | error = aa_change_profile(args, AA_CHANGE_ONEXEC); |
| 650 | else if (strcmp(command, "stack") == 0) |
| 651 | error = aa_change_profile(args, (AA_CHANGE_ONEXEC | |
| 652 | AA_CHANGE_STACK)); |
| 653 | else |
| 654 | goto fail; |
| 655 | } else |
| 656 | /* only support the "current" and "exec" process attributes */ |
| 657 | goto fail; |
| 658 | |
| 659 | if (!error) |
| 660 | error = size; |
| 661 | out: |
| 662 | kfree(largs); |
| 663 | return error; |
| 664 | |
| 665 | fail: |
| 666 | aad(&sa)->label = begin_current_label_crit_section(); |
| 667 | aad(&sa)->info = name; |
| 668 | aad(&sa)->error = error = -EINVAL; |
| 669 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
| 670 | end_current_label_crit_section(aad(&sa)->label); |
| 671 | goto out; |
| 672 | } |
| 673 | |
| 674 | /** |
| 675 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds |
| 676 | * @bprm: binprm for the exec (NOT NULL) |
| 677 | */ |
| 678 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) |
| 679 | { |
| 680 | struct aa_label *label = aa_current_raw_label(); |
| 681 | struct aa_task_ctx *new_ctx = cred_ctx(bprm->cred); |
| 682 | |
| 683 | /* bail out if unconfined or not changing profile */ |
| 684 | if ((new_ctx->label->proxy == label->proxy) || |
| 685 | (unconfined(new_ctx->label))) |
| 686 | return; |
| 687 | |
| 688 | aa_inherit_files(bprm->cred, current->files); |
| 689 | |
| 690 | current->pdeath_signal = 0; |
| 691 | |
| 692 | /* reset soft limits and set hard limits for the new label */ |
| 693 | __aa_transition_rlimits(label, new_ctx->label); |
| 694 | } |
| 695 | |
| 696 | /** |
| 697 | * apparmor_bprm_committed_cred - do cleanup after new creds committed |
| 698 | * @bprm: binprm for the exec (NOT NULL) |
| 699 | */ |
| 700 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) |
| 701 | { |
| 702 | /* TODO: cleanup signals - ipc mediation */ |
| 703 | return; |
| 704 | } |
| 705 | |
| 706 | static int apparmor_task_setrlimit(struct task_struct *task, |
| 707 | unsigned int resource, struct rlimit *new_rlim) |
| 708 | { |
| 709 | struct aa_label *label = __begin_current_label_crit_section(); |
| 710 | int error = 0; |
| 711 | |
| 712 | if (!unconfined(label)) |
| 713 | error = aa_task_setrlimit(label, task, resource, new_rlim); |
| 714 | __end_current_label_crit_section(label); |
| 715 | |
| 716 | return error; |
| 717 | } |
| 718 | |
| 719 | static int apparmor_task_kill(struct task_struct *target, struct siginfo *info, |
| 720 | int sig, u32 secid) |
| 721 | { |
| 722 | struct aa_label *cl, *tl; |
| 723 | int error; |
| 724 | |
| 725 | if (secid) |
| 726 | /* TODO: after secid to label mapping is done. |
| 727 | * Dealing with USB IO specific behavior |
| 728 | */ |
| 729 | return 0; |
| 730 | cl = __begin_current_label_crit_section(); |
| 731 | tl = aa_get_task_label(target); |
| 732 | error = aa_may_signal(cl, tl, sig); |
| 733 | aa_put_label(tl); |
| 734 | __end_current_label_crit_section(cl); |
| 735 | |
| 736 | return error; |
| 737 | } |
| 738 | |
| 739 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
| 740 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
| 741 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), |
| 742 | LSM_HOOK_INIT(capget, apparmor_capget), |
| 743 | LSM_HOOK_INIT(capable, apparmor_capable), |
| 744 | |
| 745 | LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
| 746 | LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), |
| 747 | LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), |
| 748 | |
| 749 | LSM_HOOK_INIT(path_link, apparmor_path_link), |
| 750 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), |
| 751 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), |
| 752 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), |
| 753 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), |
| 754 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), |
| 755 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), |
| 756 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), |
| 757 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), |
| 758 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), |
| 759 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), |
| 760 | |
| 761 | LSM_HOOK_INIT(file_open, apparmor_file_open), |
| 762 | LSM_HOOK_INIT(file_receive, apparmor_file_receive), |
| 763 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), |
| 764 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), |
| 765 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), |
| 766 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), |
| 767 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
| 768 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), |
| 769 | |
| 770 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), |
| 771 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), |
| 772 | |
| 773 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), |
| 774 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), |
| 775 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), |
| 776 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), |
| 777 | |
| 778 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), |
| 779 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), |
| 780 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), |
| 781 | |
| 782 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), |
| 783 | LSM_HOOK_INIT(task_kill, apparmor_task_kill), |
| 784 | }; |
| 785 | |
| 786 | /* |
| 787 | * AppArmor sysfs module parameters |
| 788 | */ |
| 789 | |
| 790 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
| 791 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); |
| 792 | #define param_check_aabool param_check_bool |
| 793 | static const struct kernel_param_ops param_ops_aabool = { |
| 794 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
| 795 | .set = param_set_aabool, |
| 796 | .get = param_get_aabool |
| 797 | }; |
| 798 | |
| 799 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
| 800 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); |
| 801 | #define param_check_aauint param_check_uint |
| 802 | static const struct kernel_param_ops param_ops_aauint = { |
| 803 | .set = param_set_aauint, |
| 804 | .get = param_get_aauint |
| 805 | }; |
| 806 | |
| 807 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
| 808 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); |
| 809 | #define param_check_aalockpolicy param_check_bool |
| 810 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
| 811 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
| 812 | .set = param_set_aalockpolicy, |
| 813 | .get = param_get_aalockpolicy |
| 814 | }; |
| 815 | |
| 816 | static int param_set_audit(const char *val, const struct kernel_param *kp); |
| 817 | static int param_get_audit(char *buffer, const struct kernel_param *kp); |
| 818 | |
| 819 | static int param_set_mode(const char *val, const struct kernel_param *kp); |
| 820 | static int param_get_mode(char *buffer, const struct kernel_param *kp); |
| 821 | |
| 822 | /* Flag values, also controllable via /sys/module/apparmor/parameters |
| 823 | * We define special types as we want to do additional mediation. |
| 824 | */ |
| 825 | |
| 826 | /* AppArmor global enforcement switch - complain, enforce, kill */ |
| 827 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; |
| 828 | module_param_call(mode, param_set_mode, param_get_mode, |
| 829 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); |
| 830 | |
| 831 | /* whether policy verification hashing is enabled */ |
| 832 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
| 833 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
| 834 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
| 835 | #endif |
| 836 | |
| 837 | /* Debug mode */ |
| 838 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
| 839 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
| 840 | |
| 841 | /* Audit mode */ |
| 842 | enum audit_mode aa_g_audit; |
| 843 | module_param_call(audit, param_set_audit, param_get_audit, |
| 844 | &aa_g_audit, S_IRUSR | S_IWUSR); |
| 845 | |
| 846 | /* Determines if audit header is included in audited messages. This |
| 847 | * provides more context if the audit daemon is not running |
| 848 | */ |
| 849 | bool aa_g_audit_header = 1; |
| 850 | module_param_named(audit_header, aa_g_audit_header, aabool, |
| 851 | S_IRUSR | S_IWUSR); |
| 852 | |
| 853 | /* lock out loading/removal of policy |
| 854 | * TODO: add in at boot loading of policy, which is the only way to |
| 855 | * load policy, if lock_policy is set |
| 856 | */ |
| 857 | bool aa_g_lock_policy; |
| 858 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
| 859 | S_IRUSR | S_IWUSR); |
| 860 | |
| 861 | /* Syscall logging mode */ |
| 862 | bool aa_g_logsyscall; |
| 863 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
| 864 | |
| 865 | /* Maximum pathname length before accesses will start getting rejected */ |
| 866 | unsigned int aa_g_path_max = 2 * PATH_MAX; |
| 867 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
| 868 | |
| 869 | /* Determines how paranoid loading of policy is and how much verification |
| 870 | * on the loaded policy is done. |
| 871 | * DEPRECATED: read only as strict checking of load is always done now |
| 872 | * that none root users (user namespaces) can load policy. |
| 873 | */ |
| 874 | bool aa_g_paranoid_load = 1; |
| 875 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
| 876 | |
| 877 | /* Boot time disable flag */ |
| 878 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
| 879 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
| 880 | |
| 881 | static int __init apparmor_enabled_setup(char *str) |
| 882 | { |
| 883 | unsigned long enabled; |
| 884 | int error = kstrtoul(str, 0, &enabled); |
| 885 | if (!error) |
| 886 | apparmor_enabled = enabled ? 1 : 0; |
| 887 | return 1; |
| 888 | } |
| 889 | |
| 890 | __setup("apparmor=", apparmor_enabled_setup); |
| 891 | |
| 892 | /* set global flag turning off the ability to load policy */ |
| 893 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
| 894 | { |
| 895 | if (!apparmor_enabled) |
| 896 | return -EINVAL; |
| 897 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
| 898 | return -EPERM; |
| 899 | return param_set_bool(val, kp); |
| 900 | } |
| 901 | |
| 902 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
| 903 | { |
| 904 | if (!apparmor_enabled) |
| 905 | return -EINVAL; |
| 906 | if (apparmor_initialized && !policy_view_capable(NULL)) |
| 907 | return -EPERM; |
| 908 | return param_get_bool(buffer, kp); |
| 909 | } |
| 910 | |
| 911 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
| 912 | { |
| 913 | if (!apparmor_enabled) |
| 914 | return -EINVAL; |
| 915 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
| 916 | return -EPERM; |
| 917 | return param_set_bool(val, kp); |
| 918 | } |
| 919 | |
| 920 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
| 921 | { |
| 922 | if (!apparmor_enabled) |
| 923 | return -EINVAL; |
| 924 | if (apparmor_initialized && !policy_view_capable(NULL)) |
| 925 | return -EPERM; |
| 926 | return param_get_bool(buffer, kp); |
| 927 | } |
| 928 | |
| 929 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
| 930 | { |
| 931 | int error; |
| 932 | |
| 933 | if (!apparmor_enabled) |
| 934 | return -EINVAL; |
| 935 | /* file is ro but enforce 2nd line check */ |
| 936 | if (apparmor_initialized) |
| 937 | return -EPERM; |
| 938 | |
| 939 | error = param_set_uint(val, kp); |
| 940 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); |
| 941 | |
| 942 | return error; |
| 943 | } |
| 944 | |
| 945 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
| 946 | { |
| 947 | if (!apparmor_enabled) |
| 948 | return -EINVAL; |
| 949 | if (apparmor_initialized && !policy_view_capable(NULL)) |
| 950 | return -EPERM; |
| 951 | return param_get_uint(buffer, kp); |
| 952 | } |
| 953 | |
| 954 | static int param_get_audit(char *buffer, const struct kernel_param *kp) |
| 955 | { |
| 956 | if (!apparmor_enabled) |
| 957 | return -EINVAL; |
| 958 | if (apparmor_initialized && !policy_view_capable(NULL)) |
| 959 | return -EPERM; |
| 960 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
| 961 | } |
| 962 | |
| 963 | static int param_set_audit(const char *val, const struct kernel_param *kp) |
| 964 | { |
| 965 | int i; |
| 966 | |
| 967 | if (!apparmor_enabled) |
| 968 | return -EINVAL; |
| 969 | if (!val) |
| 970 | return -EINVAL; |
| 971 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
| 972 | return -EPERM; |
| 973 | |
| 974 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { |
| 975 | if (strcmp(val, audit_mode_names[i]) == 0) { |
| 976 | aa_g_audit = i; |
| 977 | return 0; |
| 978 | } |
| 979 | } |
| 980 | |
| 981 | return -EINVAL; |
| 982 | } |
| 983 | |
| 984 | static int param_get_mode(char *buffer, const struct kernel_param *kp) |
| 985 | { |
| 986 | if (!apparmor_enabled) |
| 987 | return -EINVAL; |
| 988 | if (apparmor_initialized && !policy_view_capable(NULL)) |
| 989 | return -EPERM; |
| 990 | |
| 991 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
| 992 | } |
| 993 | |
| 994 | static int param_set_mode(const char *val, const struct kernel_param *kp) |
| 995 | { |
| 996 | int i; |
| 997 | |
| 998 | if (!apparmor_enabled) |
| 999 | return -EINVAL; |
| 1000 | if (!val) |
| 1001 | return -EINVAL; |
| 1002 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
| 1003 | return -EPERM; |
| 1004 | |
| 1005 | for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { |
| 1006 | if (strcmp(val, aa_profile_mode_names[i]) == 0) { |
| 1007 | aa_g_profile_mode = i; |
| 1008 | return 0; |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | return -EINVAL; |
| 1013 | } |
| 1014 | |
| 1015 | /* |
| 1016 | * AppArmor init functions |
| 1017 | */ |
| 1018 | |
| 1019 | /** |
| 1020 | * set_init_ctx - set a task context and profile on the first task. |
| 1021 | * |
| 1022 | * TODO: allow setting an alternate profile than unconfined |
| 1023 | */ |
| 1024 | static int __init set_init_ctx(void) |
| 1025 | { |
| 1026 | struct cred *cred = (struct cred *)current->real_cred; |
| 1027 | struct aa_task_ctx *ctx; |
| 1028 | |
| 1029 | ctx = aa_alloc_task_context(GFP_KERNEL); |
| 1030 | if (!ctx) |
| 1031 | return -ENOMEM; |
| 1032 | |
| 1033 | ctx->label = aa_get_label(ns_unconfined(root_ns)); |
| 1034 | cred_ctx(cred) = ctx; |
| 1035 | |
| 1036 | return 0; |
| 1037 | } |
| 1038 | |
| 1039 | static void destroy_buffers(void) |
| 1040 | { |
| 1041 | u32 i, j; |
| 1042 | |
| 1043 | for_each_possible_cpu(i) { |
| 1044 | for_each_cpu_buffer(j) { |
| 1045 | kfree(per_cpu(aa_buffers, i).buf[j]); |
| 1046 | per_cpu(aa_buffers, i).buf[j] = NULL; |
| 1047 | } |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | static int __init alloc_buffers(void) |
| 1052 | { |
| 1053 | u32 i, j; |
| 1054 | |
| 1055 | for_each_possible_cpu(i) { |
| 1056 | for_each_cpu_buffer(j) { |
| 1057 | char *buffer; |
| 1058 | |
| 1059 | if (cpu_to_node(i) > num_online_nodes()) |
| 1060 | /* fallback to kmalloc for offline nodes */ |
| 1061 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); |
| 1062 | else |
| 1063 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, |
| 1064 | cpu_to_node(i)); |
| 1065 | if (!buffer) { |
| 1066 | destroy_buffers(); |
| 1067 | return -ENOMEM; |
| 1068 | } |
| 1069 | per_cpu(aa_buffers, i).buf[j] = buffer; |
| 1070 | } |
| 1071 | } |
| 1072 | |
| 1073 | return 0; |
| 1074 | } |
| 1075 | |
| 1076 | #ifdef CONFIG_SYSCTL |
| 1077 | static int apparmor_dointvec(struct ctl_table *table, int write, |
| 1078 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 1079 | { |
| 1080 | if (!policy_admin_capable(NULL)) |
| 1081 | return -EPERM; |
| 1082 | if (!apparmor_enabled) |
| 1083 | return -EINVAL; |
| 1084 | |
| 1085 | return proc_dointvec(table, write, buffer, lenp, ppos); |
| 1086 | } |
| 1087 | |
| 1088 | static struct ctl_path apparmor_sysctl_path[] = { |
| 1089 | { .procname = "kernel", }, |
| 1090 | { } |
| 1091 | }; |
| 1092 | |
| 1093 | static struct ctl_table apparmor_sysctl_table[] = { |
| 1094 | { |
| 1095 | .procname = "unprivileged_userns_apparmor_policy", |
| 1096 | .data = &unprivileged_userns_apparmor_policy, |
| 1097 | .maxlen = sizeof(int), |
| 1098 | .mode = 0600, |
| 1099 | .proc_handler = apparmor_dointvec, |
| 1100 | }, |
| 1101 | { } |
| 1102 | }; |
| 1103 | |
| 1104 | static int __init apparmor_init_sysctl(void) |
| 1105 | { |
| 1106 | return register_sysctl_paths(apparmor_sysctl_path, |
| 1107 | apparmor_sysctl_table) ? 0 : -ENOMEM; |
| 1108 | } |
| 1109 | #else |
| 1110 | static inline int apparmor_init_sysctl(void) |
| 1111 | { |
| 1112 | return 0; |
| 1113 | } |
| 1114 | #endif /* CONFIG_SYSCTL */ |
| 1115 | |
| 1116 | static int __init apparmor_init(void) |
| 1117 | { |
| 1118 | int error; |
| 1119 | |
| 1120 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
| 1121 | aa_info_message("AppArmor disabled by boot time parameter"); |
| 1122 | apparmor_enabled = 0; |
| 1123 | return 0; |
| 1124 | } |
| 1125 | |
| 1126 | error = aa_setup_dfa_engine(); |
| 1127 | if (error) { |
| 1128 | AA_ERROR("Unable to setup dfa engine\n"); |
| 1129 | goto alloc_out; |
| 1130 | } |
| 1131 | |
| 1132 | error = aa_alloc_root_ns(); |
| 1133 | if (error) { |
| 1134 | AA_ERROR("Unable to allocate default profile namespace\n"); |
| 1135 | goto alloc_out; |
| 1136 | } |
| 1137 | |
| 1138 | error = apparmor_init_sysctl(); |
| 1139 | if (error) { |
| 1140 | AA_ERROR("Unable to register sysctls\n"); |
| 1141 | goto alloc_out; |
| 1142 | |
| 1143 | } |
| 1144 | |
| 1145 | error = alloc_buffers(); |
| 1146 | if (error) { |
| 1147 | AA_ERROR("Unable to allocate work buffers\n"); |
| 1148 | goto buffers_out; |
| 1149 | } |
| 1150 | |
| 1151 | error = set_init_ctx(); |
| 1152 | if (error) { |
| 1153 | AA_ERROR("Failed to set context on init task\n"); |
| 1154 | aa_free_root_ns(); |
| 1155 | goto buffers_out; |
| 1156 | } |
| 1157 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
| 1158 | "apparmor"); |
| 1159 | |
| 1160 | /* Report that AppArmor successfully initialized */ |
| 1161 | apparmor_initialized = 1; |
| 1162 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) |
| 1163 | aa_info_message("AppArmor initialized: complain mode enabled"); |
| 1164 | else if (aa_g_profile_mode == APPARMOR_KILL) |
| 1165 | aa_info_message("AppArmor initialized: kill mode enabled"); |
| 1166 | else |
| 1167 | aa_info_message("AppArmor initialized"); |
| 1168 | |
| 1169 | return error; |
| 1170 | |
| 1171 | buffers_out: |
| 1172 | destroy_buffers(); |
| 1173 | |
| 1174 | alloc_out: |
| 1175 | aa_destroy_aafs(); |
| 1176 | aa_teardown_dfa_engine(); |
| 1177 | |
| 1178 | apparmor_enabled = 0; |
| 1179 | return error; |
| 1180 | } |
| 1181 | |
| 1182 | security_initcall(apparmor_init); |