security/dummy.c

   1 /*
   2  * Stub functions for the default security function pointers in case no
   3  * security model is loaded.
   4  *
   5  * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
   6  * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
   7  * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/security.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/netlink.h>
  21
  22 static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
  23 {
  24         return 0;
  25 }
  26
  27 static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
  28                          kernel_cap_t * inheritable, kernel_cap_t * permitted)
  29 {
  30         return 0;
  31 }
  32
  33 static int dummy_capset_check (struct task_struct *target,
  34                                kernel_cap_t * effective,
  35                                kernel_cap_t * inheritable,
  36                                kernel_cap_t * permitted)
  37 {
  38         return 0;
  39 }
  40
  41 static void dummy_capset_set (struct task_struct *target,
  42                               kernel_cap_t * effective,
  43                               kernel_cap_t * inheritable,
  44                               kernel_cap_t * permitted)
  45 {
  46         return;
  47 }
  48
  49 static int dummy_acct (struct file *file)
  50 {
  51         return 0;
  52 }
  53
  54 static int dummy_capable (struct task_struct *tsk, int cap)
  55 {
  56         if (cap_is_fs_cap (cap) ? tsk->fsuid == 0 : tsk->euid == 0)
  57                 /* capability granted */
  58                 return 0;
  59
  60         /* capability denied */
  61         return -EPERM;
  62 }
  63
  64 static int dummy_sys_security (unsigned int id, unsigned int call,
  65                                unsigned long *args)
  66 {
  67         return -ENOSYS;
  68 }
  69
  70 static int dummy_quotactl (int cmds, int type, int id, struct super_block *sb)
  71 {
  72         return 0;
  73 }
  74
  75 static int dummy_quota_on (struct file *f)
  76 {
  77         return 0;
  78 }
  79
  80 static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
  81 {
  82         return 0;
  83 }
  84
  85 static void dummy_bprm_free_security (struct linux_binprm *bprm)
  86 {
  87         return;
  88 }
  89
  90 static void dummy_bprm_compute_creds (struct linux_binprm *bprm)
  91 {
  92         return;
  93 }
  94
  95 static int dummy_bprm_set_security (struct linux_binprm *bprm)
  96 {
  97         return 0;
  98 }
  99
 100 static int dummy_bprm_check_security (struct linux_binprm *bprm)
 101 {
 102         return 0;
 103 }
 104
 105 static int dummy_sb_alloc_security (struct super_block *sb)
 106 {
 107         return 0;
 108 }
 109
 110 static void dummy_sb_free_security (struct super_block *sb)
 111 {
 112         return;
 113 }
 114
 115 static int dummy_sb_statfs (struct super_block *sb)
 116 {
 117         return 0;
 118 }
 119
 120 static int dummy_mount (char *dev_name, struct nameidata *nd, char *type,
 121                         unsigned long flags, void *data)
 122 {
 123         return 0;
 124 }
 125
 126 static int dummy_check_sb (struct vfsmount *mnt, struct nameidata *nd)
 127 {
 128         return 0;
 129 }
 130
 131 static int dummy_umount (struct vfsmount *mnt, int flags)
 132 {
 133         return 0;
 134 }
 135
 136 static void dummy_umount_close (struct vfsmount *mnt)
 137 {
 138         return;
 139 }
 140
 141 static void dummy_umount_busy (struct vfsmount *mnt)
 142 {
 143         return;
 144 }
 145
 146 static void dummy_post_remount (struct vfsmount *mnt, unsigned long flags,
 147                                 void *data)
 148 {
 149         return;
 150 }
 151
 152
 153 static void dummy_post_mountroot (void)
 154 {
 155         return;
 156 }
 157
 158 static void dummy_post_addmount (struct vfsmount *mnt, struct nameidata *nd)
 159 {
 160         return;
 161 }
 162
 163 static int dummy_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
 164 {
 165         return 0;
 166 }
 167
 168 static void dummy_post_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
 169 {
 170         return;
 171 }
 172
 173 static int dummy_inode_alloc_security (struct inode *inode)
 174 {
 175         return 0;
 176 }
 177
 178 static void dummy_inode_free_security (struct inode *inode)
 179 {
 180         return;
 181 }
 182
 183 static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
 184                                int mask)
 185 {
 186         return 0;
 187 }
 188
 189 static void dummy_inode_post_create (struct inode *inode, struct dentry *dentry,
 190                                      int mask)
 191 {
 192         return;
 193 }
 194
 195 static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
 196                              struct dentry *new_dentry)
 197 {
 198         return 0;
 199 }
 200
 201 static void dummy_inode_post_link (struct dentry *old_dentry,
 202                                    struct inode *inode,
 203                                    struct dentry *new_dentry)
 204 {
 205         return;
 206 }
 207
 208 static int dummy_inode_unlink (struct inode *inode, struct dentry *dentry)
 209 {
 210         return 0;
 211 }
 212
 213 static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
 214                                 const char *name)
 215 {
 216         return 0;
 217 }
 218
 219 static void dummy_inode_post_symlink (struct inode *inode,
 220                                       struct dentry *dentry, const char *name)
 221 {
 222         return;
 223 }
 224
 225 static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
 226                               int mask)
 227 {
 228         return 0;
 229 }
 230
 231 static void dummy_inode_post_mkdir (struct inode *inode, struct dentry *dentry,
 232                                     int mask)
 233 {
 234         return;
 235 }
 236
 237 static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
 238 {
 239         return 0;
 240 }
 241
 242 static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
 243                               int major, dev_t minor)
 244 {
 245         return 0;
 246 }
 247
 248 static void dummy_inode_post_mknod (struct inode *inode, struct dentry *dentry,
 249                                     int major, dev_t minor)
 250 {
 251         return;
 252 }
 253
 254 static int dummy_inode_rename (struct inode *old_inode,
 255                                struct dentry *old_dentry,
 256                                struct inode *new_inode,
 257                                struct dentry *new_dentry)
 258 {
 259         return 0;
 260 }
 261
 262 static void dummy_inode_post_rename (struct inode *old_inode,
 263                                      struct dentry *old_dentry,
 264                                      struct inode *new_inode,
 265                                      struct dentry *new_dentry)
 266 {
 267         return;
 268 }
 269
 270 static int dummy_inode_readlink (struct dentry *dentry)
 271 {
 272         return 0;
 273 }
 274
 275 static int dummy_inode_follow_link (struct dentry *dentry,
 276                                     struct nameidata *nameidata)
 277 {
 278         return 0;
 279 }
 280
 281 static int dummy_inode_permission (struct inode *inode, int mask)
 282 {
 283         return 0;
 284 }
 285
 286 static int dummy_inode_permission_lite (struct inode *inode, int mask)
 287 {
 288         return 0;
 289 }
 290
 291 static int dummy_inode_setattr (struct dentry *dentry, struct iattr *iattr)
 292 {
 293         return 0;
 294 }
 295
 296 static int dummy_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
 297 {
 298         return 0;
 299 }
 300
 301 static void dummy_post_lookup (struct inode *ino, struct dentry *d)
 302 {
 303         return;
 304 }
 305
 306 static void dummy_delete (struct inode *ino)
 307 {
 308         return;
 309 }
 310
 311 static int dummy_inode_setxattr (struct dentry *dentry, char *name, void *value,
 312                                 size_t size, int flags)
 313 {
 314         return 0;
 315 }
 316
 317 static int dummy_inode_getxattr (struct dentry *dentry, char *name)
 318 {
 319         return 0;
 320 }
 321
 322 static int dummy_inode_listxattr (struct dentry *dentry)
 323 {
 324         return 0;
 325 }
 326
 327 static int dummy_inode_removexattr (struct dentry *dentry, char *name)
 328 {
 329         return 0;
 330 }
 331
 332 static int dummy_file_permission (struct file *file, int mask)
 333 {
 334         return 0;
 335 }
 336
 337 static int dummy_file_alloc_security (struct file *file)
 338 {
 339         return 0;
 340 }
 341
 342 static void dummy_file_free_security (struct file *file)
 343 {
 344         return;
 345 }
 346
 347 static int dummy_file_llseek (struct file *file)
 348 {
 349         return 0;
 350 }
 351
 352 static int dummy_file_ioctl (struct file *file, unsigned int command,
 353                              unsigned long arg)
 354 {
 355         return 0;
 356 }
 357
 358 static int dummy_file_mmap (struct file *file, unsigned long prot,
 359                             unsigned long flags)
 360 {
 361         return 0;
 362 }
 363
 364 static int dummy_file_mprotect (struct vm_area_struct *vma, unsigned long prot)
 365 {
 366         return 0;
 367 }
 368
 369 static int dummy_file_lock (struct file *file, unsigned int cmd)
 370 {
 371         return 0;
 372 }
 373
 374 static int dummy_file_fcntl (struct file *file, unsigned int cmd,
 375                              unsigned long arg)
 376 {
 377         return 0;
 378 }
 379
 380 static int dummy_file_set_fowner (struct file *file)
 381 {
 382         return 0;
 383 }
 384
 385 static int dummy_file_send_sigiotask (struct task_struct *tsk,
 386                                       struct fown_struct *fown, int fd,
 387                                       int reason)
 388 {
 389         return 0;
 390 }
 391
 392 static int dummy_file_receive (struct file *file)
 393 {
 394         return 0;
 395 }
 396
 397 static int dummy_task_create (unsigned long clone_flags)
 398 {
 399         return 0;
 400 }
 401
 402 static int dummy_task_alloc_security (struct task_struct *p)
 403 {
 404         return 0;
 405 }
 406
 407 static void dummy_task_free_security (struct task_struct *p)
 408 {
 409         return;
 410 }
 411
 412 static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 413 {
 414         return 0;
 415 }
 416
 417 static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
 418 {
 419         return 0;
 420 }
 421
 422 static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
 423 {
 424         return 0;
 425 }
 426
 427 static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
 428 {
 429         return 0;
 430 }
 431
 432 static int dummy_task_getpgid (struct task_struct *p)
 433 {
 434         return 0;
 435 }
 436
 437 static int dummy_task_getsid (struct task_struct *p)
 438 {
 439         return 0;
 440 }
 441
 442 static int dummy_task_setgroups (int gidsetsize, gid_t * grouplist)
 443 {
 444         return 0;
 445 }
 446
 447 static int dummy_task_setnice (struct task_struct *p, int nice)
 448 {
 449         return 0;
 450 }
 451
 452 static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
 453 {
 454         return 0;
 455 }
 456
 457 static int dummy_task_setscheduler (struct task_struct *p, int policy,
 458                                     struct sched_param *lp)
 459 {
 460         return 0;
 461 }
 462
 463 static int dummy_task_getscheduler (struct task_struct *p)
 464 {
 465         return 0;
 466 }
 467
 468 static int dummy_task_wait (struct task_struct *p)
 469 {
 470         return 0;
 471 }
 472
 473 static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
 474                             int sig)
 475 {
 476         return 0;
 477 }
 478
 479 static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
 480                              unsigned long arg4, unsigned long arg5)
 481 {
 482         return 0;
 483 }
 484
 485 static void dummy_task_kmod_set_label (void)
 486 {
 487         return;
 488 }
 489
 490 static void dummy_task_reparent_to_init (struct task_struct *p)
 491 {
 492         p->euid = p->fsuid = 0;
 493         return;
 494 }
 495
 496 static int dummy_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
 497 {
 498         return 0;
 499 }
 500
 501
 502 static int dummy_msg_queue_alloc_security (struct msg_queue *msq)
 503 {
 504         return 0;
 505 }
 506
 507 static void dummy_msg_queue_free_security (struct msg_queue *msq)
 508 {
 509         return;
 510 }
 511
 512 static int dummy_shm_alloc_security (struct shmid_kernel *shp)
 513 {
 514         return 0;
 515 }
 516
 517 static void dummy_shm_free_security (struct shmid_kernel *shp)
 518 {
 519         return;
 520 }
 521
 522 static int dummy_sem_alloc_security (struct sem_array *sma)
 523 {
 524         return 0;
 525 }
 526
 527 static void dummy_sem_free_security (struct sem_array *sma)
 528 {
 529         return;
 530 }
 531
 532 static int dummy_register (const char *name, struct security_operations *ops)
 533 {
 534         return -EINVAL;
 535 }
 536
 537 static int dummy_unregister (const char *name, struct security_operations *ops)
 538 {
 539         return -EINVAL;
 540 }
 541
 542 struct security_operations dummy_security_ops = {
 543         .ptrace =                       dummy_ptrace,
 544         .capget =                       dummy_capget,
 545         .capset_check =                 dummy_capset_check,
 546         .capset_set =                   dummy_capset_set,
 547         .acct =                         dummy_acct,
 548         .capable =                      dummy_capable,
 549         .sys_security =                 dummy_sys_security,
 550         .quotactl =                     dummy_quotactl,
 551         .quota_on =                     dummy_quota_on,
 552
 553         .bprm_alloc_security =          dummy_bprm_alloc_security,
 554         .bprm_free_security =           dummy_bprm_free_security,
 555         .bprm_compute_creds =           dummy_bprm_compute_creds,
 556         .bprm_set_security =            dummy_bprm_set_security,
 557         .bprm_check_security =          dummy_bprm_check_security,
 558
 559         .sb_alloc_security =            dummy_sb_alloc_security,
 560         .sb_free_security =             dummy_sb_free_security,
 561         .sb_statfs =                    dummy_sb_statfs,
 562         .sb_mount =                     dummy_mount,
 563         .sb_check_sb =                  dummy_check_sb,
 564         .sb_umount =                    dummy_umount,
 565         .sb_umount_close =              dummy_umount_close,
 566         .sb_umount_busy =               dummy_umount_busy,
 567         .sb_post_remount =              dummy_post_remount,
 568         .sb_post_mountroot =            dummy_post_mountroot,
 569         .sb_post_addmount =             dummy_post_addmount,
 570         .sb_pivotroot =                 dummy_pivotroot,
 571         .sb_post_pivotroot =            dummy_post_pivotroot,
 572
 573         .inode_alloc_security =         dummy_inode_alloc_security,
 574         .inode_free_security =          dummy_inode_free_security,
 575         .inode_create =                 dummy_inode_create,
 576         .inode_post_create =            dummy_inode_post_create,
 577         .inode_link =                   dummy_inode_link,
 578         .inode_post_link =              dummy_inode_post_link,
 579         .inode_unlink =                 dummy_inode_unlink,
 580         .inode_symlink =                dummy_inode_symlink,
 581         .inode_post_symlink =           dummy_inode_post_symlink,
 582         .inode_mkdir =                  dummy_inode_mkdir,
 583         .inode_post_mkdir =             dummy_inode_post_mkdir,
 584         .inode_rmdir =                  dummy_inode_rmdir,
 585         .inode_mknod =                  dummy_inode_mknod,
 586         .inode_post_mknod =             dummy_inode_post_mknod,
 587         .inode_rename =                 dummy_inode_rename,
 588         .inode_post_rename =            dummy_inode_post_rename,
 589         .inode_readlink =               dummy_inode_readlink,
 590         .inode_follow_link =            dummy_inode_follow_link,
 591         .inode_permission =             dummy_inode_permission,
 592         .inode_permission_lite =        dummy_inode_permission_lite,
 593         .inode_setattr =                dummy_inode_setattr,
 594         .inode_getattr =                dummy_inode_getattr,
 595         .inode_post_lookup =            dummy_post_lookup,
 596         .inode_delete =                 dummy_delete,
 597         .inode_setxattr =               dummy_inode_setxattr,
 598         .inode_getxattr =               dummy_inode_getxattr,
 599         .inode_listxattr =              dummy_inode_listxattr,
 600         .inode_removexattr =            dummy_inode_removexattr,
 601
 602         .file_permission =              dummy_file_permission,
 603         .file_alloc_security =          dummy_file_alloc_security,
 604         .file_free_security =           dummy_file_free_security,
 605         .file_llseek =                  dummy_file_llseek,
 606         .file_ioctl =                   dummy_file_ioctl,
 607         .file_mmap =                    dummy_file_mmap,
 608         .file_mprotect =                dummy_file_mprotect,
 609         .file_lock =                    dummy_file_lock,
 610         .file_fcntl =                   dummy_file_fcntl,
 611         .file_set_fowner =              dummy_file_set_fowner,
 612         .file_send_sigiotask =          dummy_file_send_sigiotask,
 613         .file_receive =                 dummy_file_receive,
 614
 615         .task_create =                  dummy_task_create,
 616         .task_alloc_security =          dummy_task_alloc_security,
 617         .task_free_security =           dummy_task_free_security,
 618         .task_setuid =                  dummy_task_setuid,
 619         .task_post_setuid =             dummy_task_post_setuid,
 620         .task_setgid =                  dummy_task_setgid,
 621         .task_setpgid =                 dummy_task_setpgid,
 622         .task_getpgid =                 dummy_task_getpgid,
 623         .task_getsid =                  dummy_task_getsid,
 624         .task_setgroups =               dummy_task_setgroups,
 625         .task_setnice =                 dummy_task_setnice,
 626         .task_setrlimit =               dummy_task_setrlimit,
 627         .task_setscheduler =            dummy_task_setscheduler,
 628         .task_getscheduler =            dummy_task_getscheduler,
 629         .task_wait =                    dummy_task_wait,
 630         .task_kill =                    dummy_task_kill,
 631         .task_prctl =                   dummy_task_prctl,
 632         .task_kmod_set_label =          dummy_task_kmod_set_label,
 633         .task_reparent_to_init =        dummy_task_reparent_to_init,
 634
 635         .ipc_permission =               dummy_ipc_permission,
 636
 637         .msg_queue_alloc_security =     dummy_msg_queue_alloc_security,
 638         .msg_queue_free_security =      dummy_msg_queue_free_security,
 639
 640         .shm_alloc_security =           dummy_shm_alloc_security,
 641         .shm_free_security =            dummy_shm_free_security,
 642
 643         .sem_alloc_security =           dummy_sem_alloc_security,
 644         .sem_free_security =            dummy_sem_free_security,
 645
 646         .register_security =            dummy_register,
 647         .unregister_security =          dummy_unregister,
 648 };
 649