1b5e95b48SJohn Johansen /* 2b5e95b48SJohn Johansen * AppArmor security module 3b5e95b48SJohn Johansen * 4b5e95b48SJohn Johansen * This file contains AppArmor LSM hooks. 5b5e95b48SJohn Johansen * 6b5e95b48SJohn Johansen * Copyright (C) 1998-2008 Novell/SUSE 7b5e95b48SJohn Johansen * Copyright 2009-2010 Canonical Ltd. 8b5e95b48SJohn Johansen * 9b5e95b48SJohn Johansen * This program is free software; you can redistribute it and/or 10b5e95b48SJohn Johansen * modify it under the terms of the GNU General Public License as 11b5e95b48SJohn Johansen * published by the Free Software Foundation, version 2 of the 12b5e95b48SJohn Johansen * License. 13b5e95b48SJohn Johansen */ 14b5e95b48SJohn Johansen 153c4ed7bdSCasey Schaufler #include <linux/lsm_hooks.h> 16b5e95b48SJohn Johansen #include <linux/moduleparam.h> 17b5e95b48SJohn Johansen #include <linux/mm.h> 18b5e95b48SJohn Johansen #include <linux/mman.h> 19b5e95b48SJohn Johansen #include <linux/mount.h> 20b5e95b48SJohn Johansen #include <linux/namei.h> 21b5e95b48SJohn Johansen #include <linux/ptrace.h> 22b5e95b48SJohn Johansen #include <linux/ctype.h> 23b5e95b48SJohn Johansen #include <linux/sysctl.h> 24b5e95b48SJohn Johansen #include <linux/audit.h> 253486740aSSerge E. Hallyn #include <linux/user_namespace.h> 26b5e95b48SJohn Johansen #include <net/sock.h> 27b5e95b48SJohn Johansen 28b5e95b48SJohn Johansen #include "include/apparmor.h" 29b5e95b48SJohn Johansen #include "include/apparmorfs.h" 30b5e95b48SJohn Johansen #include "include/audit.h" 31b5e95b48SJohn Johansen #include "include/capability.h" 32b5e95b48SJohn Johansen #include "include/context.h" 33b5e95b48SJohn Johansen #include "include/file.h" 34b5e95b48SJohn Johansen #include "include/ipc.h" 35b5e95b48SJohn Johansen #include "include/path.h" 36b5e95b48SJohn Johansen #include "include/policy.h" 37cff281f6SJohn Johansen #include "include/policy_ns.h" 38b5e95b48SJohn Johansen #include "include/procattr.h" 39b5e95b48SJohn Johansen 40b5e95b48SJohn Johansen /* Flag indicating whether initialization completed */ 41b5e95b48SJohn Johansen int apparmor_initialized __initdata; 42b5e95b48SJohn Johansen 43b5e95b48SJohn Johansen /* 44b5e95b48SJohn Johansen * LSM hook functions 45b5e95b48SJohn Johansen */ 46b5e95b48SJohn Johansen 47b5e95b48SJohn Johansen /* 48b5e95b48SJohn Johansen * free the associated aa_task_cxt and put its profiles 49b5e95b48SJohn Johansen */ 50b5e95b48SJohn Johansen static void apparmor_cred_free(struct cred *cred) 51b5e95b48SJohn Johansen { 52214beacaSJohn Johansen aa_free_task_context(cred_cxt(cred)); 53214beacaSJohn Johansen cred_cxt(cred) = NULL; 54b5e95b48SJohn Johansen } 55b5e95b48SJohn Johansen 56b5e95b48SJohn Johansen /* 57b5e95b48SJohn Johansen * allocate the apparmor part of blank credentials 58b5e95b48SJohn Johansen */ 59b5e95b48SJohn Johansen static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) 60b5e95b48SJohn Johansen { 61b5e95b48SJohn Johansen /* freed by apparmor_cred_free */ 62b5e95b48SJohn Johansen struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); 63b5e95b48SJohn Johansen if (!cxt) 64b5e95b48SJohn Johansen return -ENOMEM; 65b5e95b48SJohn Johansen 66214beacaSJohn Johansen cred_cxt(cred) = cxt; 67b5e95b48SJohn Johansen return 0; 68b5e95b48SJohn Johansen } 69b5e95b48SJohn Johansen 70b5e95b48SJohn Johansen /* 71b5e95b48SJohn Johansen * prepare new aa_task_cxt for modification by prepare_cred block 72b5e95b48SJohn Johansen */ 73b5e95b48SJohn Johansen static int apparmor_cred_prepare(struct cred *new, const struct cred *old, 74b5e95b48SJohn Johansen gfp_t gfp) 75b5e95b48SJohn Johansen { 76b5e95b48SJohn Johansen /* freed by apparmor_cred_free */ 77b5e95b48SJohn Johansen struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); 78b5e95b48SJohn Johansen if (!cxt) 79b5e95b48SJohn Johansen return -ENOMEM; 80b5e95b48SJohn Johansen 81214beacaSJohn Johansen aa_dup_task_context(cxt, cred_cxt(old)); 82214beacaSJohn Johansen cred_cxt(new) = cxt; 83b5e95b48SJohn Johansen return 0; 84b5e95b48SJohn Johansen } 85b5e95b48SJohn Johansen 86b5e95b48SJohn Johansen /* 87b5e95b48SJohn Johansen * transfer the apparmor data to a blank set of creds 88b5e95b48SJohn Johansen */ 89b5e95b48SJohn Johansen static void apparmor_cred_transfer(struct cred *new, const struct cred *old) 90b5e95b48SJohn Johansen { 91214beacaSJohn Johansen const struct aa_task_cxt *old_cxt = cred_cxt(old); 92214beacaSJohn Johansen struct aa_task_cxt *new_cxt = cred_cxt(new); 93b5e95b48SJohn Johansen 94b5e95b48SJohn Johansen aa_dup_task_context(new_cxt, old_cxt); 95b5e95b48SJohn Johansen } 96b5e95b48SJohn Johansen 97b5e95b48SJohn Johansen static int apparmor_ptrace_access_check(struct task_struct *child, 98b5e95b48SJohn Johansen unsigned int mode) 99b5e95b48SJohn Johansen { 100b5e95b48SJohn Johansen return aa_ptrace(current, child, mode); 101b5e95b48SJohn Johansen } 102b5e95b48SJohn Johansen 103b5e95b48SJohn Johansen static int apparmor_ptrace_traceme(struct task_struct *parent) 104b5e95b48SJohn Johansen { 105b5e95b48SJohn Johansen return aa_ptrace(parent, current, PTRACE_MODE_ATTACH); 106b5e95b48SJohn Johansen } 107b5e95b48SJohn Johansen 108b5e95b48SJohn Johansen /* Derived from security/commoncap.c:cap_capget */ 109b5e95b48SJohn Johansen static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, 110b5e95b48SJohn Johansen kernel_cap_t *inheritable, kernel_cap_t *permitted) 111b5e95b48SJohn Johansen { 112b5e95b48SJohn Johansen struct aa_profile *profile; 113b5e95b48SJohn Johansen const struct cred *cred; 114b5e95b48SJohn Johansen 115b5e95b48SJohn Johansen rcu_read_lock(); 116b5e95b48SJohn Johansen cred = __task_cred(target); 117b5e95b48SJohn Johansen profile = aa_cred_profile(cred); 118b5e95b48SJohn Johansen 119b1d9e6b0SCasey Schaufler /* 120b1d9e6b0SCasey Schaufler * cap_capget is stacked ahead of this and will 121b1d9e6b0SCasey Schaufler * initialize effective and permitted. 122b1d9e6b0SCasey Schaufler */ 12325e75dffSJohn Johansen if (!unconfined(profile) && !COMPLAIN_MODE(profile)) { 124b5e95b48SJohn Johansen *effective = cap_intersect(*effective, profile->caps.allow); 125b5e95b48SJohn Johansen *permitted = cap_intersect(*permitted, profile->caps.allow); 126b5e95b48SJohn Johansen } 127b5e95b48SJohn Johansen rcu_read_unlock(); 128b5e95b48SJohn Johansen 129b5e95b48SJohn Johansen return 0; 130b5e95b48SJohn Johansen } 131b5e95b48SJohn Johansen 1326a9de491SEric Paris static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, 1336a9de491SEric Paris int cap, int audit) 134b5e95b48SJohn Johansen { 135b5e95b48SJohn Johansen struct aa_profile *profile; 136b1d9e6b0SCasey Schaufler int error = 0; 137b1d9e6b0SCasey Schaufler 138b5e95b48SJohn Johansen profile = aa_cred_profile(cred); 139b5e95b48SJohn Johansen if (!unconfined(profile)) 140dd0c6e86SJohn Johansen error = aa_capable(profile, cap, audit); 141b5e95b48SJohn Johansen return error; 142b5e95b48SJohn Johansen } 143b5e95b48SJohn Johansen 144b5e95b48SJohn Johansen /** 145b5e95b48SJohn Johansen * common_perm - basic common permission check wrapper fn for paths 146b5e95b48SJohn Johansen * @op: operation being checked 147b5e95b48SJohn Johansen * @path: path to check permission of (NOT NULL) 148b5e95b48SJohn Johansen * @mask: requested permissions mask 149b5e95b48SJohn Johansen * @cond: conditional info for the permission request (NOT NULL) 150b5e95b48SJohn Johansen * 151b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 152b5e95b48SJohn Johansen */ 1532c7661ffSAl Viro static int common_perm(int op, const struct path *path, u32 mask, 154b5e95b48SJohn Johansen struct path_cond *cond) 155b5e95b48SJohn Johansen { 156b5e95b48SJohn Johansen struct aa_profile *profile; 157b5e95b48SJohn Johansen int error = 0; 158b5e95b48SJohn Johansen 159b5e95b48SJohn Johansen profile = __aa_current_profile(); 160b5e95b48SJohn Johansen if (!unconfined(profile)) 161b5e95b48SJohn Johansen error = aa_path_perm(op, profile, path, 0, mask, cond); 162b5e95b48SJohn Johansen 163b5e95b48SJohn Johansen return error; 164b5e95b48SJohn Johansen } 165b5e95b48SJohn Johansen 166b5e95b48SJohn Johansen /** 167b5e95b48SJohn Johansen * common_perm_dir_dentry - common permission wrapper when path is dir, dentry 168b5e95b48SJohn Johansen * @op: operation being checked 169b5e95b48SJohn Johansen * @dir: directory of the dentry (NOT NULL) 170b5e95b48SJohn Johansen * @dentry: dentry to check (NOT NULL) 171b5e95b48SJohn Johansen * @mask: requested permissions mask 172b5e95b48SJohn Johansen * @cond: conditional info for the permission request (NOT NULL) 173b5e95b48SJohn Johansen * 174b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 175b5e95b48SJohn Johansen */ 176d6b49f7aSAl Viro static int common_perm_dir_dentry(int op, const struct path *dir, 177b5e95b48SJohn Johansen struct dentry *dentry, u32 mask, 178b5e95b48SJohn Johansen struct path_cond *cond) 179b5e95b48SJohn Johansen { 1808486adf0SKees Cook struct path path = { .mnt = dir->mnt, .dentry = dentry }; 181b5e95b48SJohn Johansen 182b5e95b48SJohn Johansen return common_perm(op, &path, mask, cond); 183b5e95b48SJohn Johansen } 184b5e95b48SJohn Johansen 185b5e95b48SJohn Johansen /** 186741aca71SAl Viro * common_perm_path - common permission wrapper when mnt, dentry 187b5e95b48SJohn Johansen * @op: operation being checked 188741aca71SAl Viro * @path: location to check (NOT NULL) 189b5e95b48SJohn Johansen * @mask: requested permissions mask 190b5e95b48SJohn Johansen * 191b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 192b5e95b48SJohn Johansen */ 193741aca71SAl Viro static inline int common_perm_path(int op, const struct path *path, u32 mask) 194b5e95b48SJohn Johansen { 195741aca71SAl Viro struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, 196741aca71SAl Viro d_backing_inode(path->dentry)->i_mode 197b5e95b48SJohn Johansen }; 198efeee83aSJohn Johansen if (!path_mediated_fs(path->dentry)) 199741aca71SAl Viro return 0; 200b5e95b48SJohn Johansen 201741aca71SAl Viro return common_perm(op, path, mask, &cond); 202b5e95b48SJohn Johansen } 203b5e95b48SJohn Johansen 204b5e95b48SJohn Johansen /** 205b5e95b48SJohn Johansen * common_perm_rm - common permission wrapper for operations doing rm 206b5e95b48SJohn Johansen * @op: operation being checked 207b5e95b48SJohn Johansen * @dir: directory that the dentry is in (NOT NULL) 208b5e95b48SJohn Johansen * @dentry: dentry being rm'd (NOT NULL) 209b5e95b48SJohn Johansen * @mask: requested permission mask 210b5e95b48SJohn Johansen * 211b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 212b5e95b48SJohn Johansen */ 213d6b49f7aSAl Viro static int common_perm_rm(int op, const struct path *dir, 214b5e95b48SJohn Johansen struct dentry *dentry, u32 mask) 215b5e95b48SJohn Johansen { 216c6f493d6SDavid Howells struct inode *inode = d_backing_inode(dentry); 217b5e95b48SJohn Johansen struct path_cond cond = { }; 218b5e95b48SJohn Johansen 219efeee83aSJohn Johansen if (!inode || !path_mediated_fs(dentry)) 220b5e95b48SJohn Johansen return 0; 221b5e95b48SJohn Johansen 222b5e95b48SJohn Johansen cond.uid = inode->i_uid; 223b5e95b48SJohn Johansen cond.mode = inode->i_mode; 224b5e95b48SJohn Johansen 225b5e95b48SJohn Johansen return common_perm_dir_dentry(op, dir, dentry, mask, &cond); 226b5e95b48SJohn Johansen } 227b5e95b48SJohn Johansen 228b5e95b48SJohn Johansen /** 229b5e95b48SJohn Johansen * common_perm_create - common permission wrapper for operations doing create 230b5e95b48SJohn Johansen * @op: operation being checked 231b5e95b48SJohn Johansen * @dir: directory that dentry will be created in (NOT NULL) 232b5e95b48SJohn Johansen * @dentry: dentry to create (NOT NULL) 233b5e95b48SJohn Johansen * @mask: request permission mask 234b5e95b48SJohn Johansen * @mode: created file mode 235b5e95b48SJohn Johansen * 236b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 237b5e95b48SJohn Johansen */ 238d6b49f7aSAl Viro static int common_perm_create(int op, const struct path *dir, 239d6b49f7aSAl Viro struct dentry *dentry, u32 mask, umode_t mode) 240b5e95b48SJohn Johansen { 241b5e95b48SJohn Johansen struct path_cond cond = { current_fsuid(), mode }; 242b5e95b48SJohn Johansen 243efeee83aSJohn Johansen if (!path_mediated_fs(dir->dentry)) 244b5e95b48SJohn Johansen return 0; 245b5e95b48SJohn Johansen 246b5e95b48SJohn Johansen return common_perm_dir_dentry(op, dir, dentry, mask, &cond); 247b5e95b48SJohn Johansen } 248b5e95b48SJohn Johansen 249989f74e0SAl Viro static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) 250b5e95b48SJohn Johansen { 251b5e95b48SJohn Johansen return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); 252b5e95b48SJohn Johansen } 253b5e95b48SJohn Johansen 254d3607752SAl Viro static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, 2554572befeSAl Viro umode_t mode) 256b5e95b48SJohn Johansen { 257b5e95b48SJohn Johansen return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, 258b5e95b48SJohn Johansen S_IFDIR); 259b5e95b48SJohn Johansen } 260b5e95b48SJohn Johansen 261989f74e0SAl Viro static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) 262b5e95b48SJohn Johansen { 263b5e95b48SJohn Johansen return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); 264b5e95b48SJohn Johansen } 265b5e95b48SJohn Johansen 266d3607752SAl Viro static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, 26704fc66e7SAl Viro umode_t mode, unsigned int dev) 268b5e95b48SJohn Johansen { 269b5e95b48SJohn Johansen return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); 270b5e95b48SJohn Johansen } 271b5e95b48SJohn Johansen 27281f4c506SAl Viro static int apparmor_path_truncate(const struct path *path) 273b5e95b48SJohn Johansen { 274741aca71SAl Viro return common_perm_path(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE); 275b5e95b48SJohn Johansen } 276b5e95b48SJohn Johansen 277d3607752SAl Viro static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, 278b5e95b48SJohn Johansen const char *old_name) 279b5e95b48SJohn Johansen { 280b5e95b48SJohn Johansen return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, 281b5e95b48SJohn Johansen S_IFLNK); 282b5e95b48SJohn Johansen } 283b5e95b48SJohn Johansen 2843ccee46aSAl Viro static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, 285b5e95b48SJohn Johansen struct dentry *new_dentry) 286b5e95b48SJohn Johansen { 287b5e95b48SJohn Johansen struct aa_profile *profile; 288b5e95b48SJohn Johansen int error = 0; 289b5e95b48SJohn Johansen 290efeee83aSJohn Johansen if (!path_mediated_fs(old_dentry)) 291b5e95b48SJohn Johansen return 0; 292b5e95b48SJohn Johansen 293b5e95b48SJohn Johansen profile = aa_current_profile(); 294b5e95b48SJohn Johansen if (!unconfined(profile)) 295b5e95b48SJohn Johansen error = aa_path_link(profile, old_dentry, new_dir, new_dentry); 296b5e95b48SJohn Johansen return error; 297b5e95b48SJohn Johansen } 298b5e95b48SJohn Johansen 2993ccee46aSAl Viro static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, 3003ccee46aSAl Viro const struct path *new_dir, struct dentry *new_dentry) 301b5e95b48SJohn Johansen { 302b5e95b48SJohn Johansen struct aa_profile *profile; 303b5e95b48SJohn Johansen int error = 0; 304b5e95b48SJohn Johansen 305efeee83aSJohn Johansen if (!path_mediated_fs(old_dentry)) 306b5e95b48SJohn Johansen return 0; 307b5e95b48SJohn Johansen 308b5e95b48SJohn Johansen profile = aa_current_profile(); 309b5e95b48SJohn Johansen if (!unconfined(profile)) { 3108486adf0SKees Cook struct path old_path = { .mnt = old_dir->mnt, 3118486adf0SKees Cook .dentry = old_dentry }; 3128486adf0SKees Cook struct path new_path = { .mnt = new_dir->mnt, 3138486adf0SKees Cook .dentry = new_dentry }; 314c6f493d6SDavid Howells struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, 315c6f493d6SDavid Howells d_backing_inode(old_dentry)->i_mode 316b5e95b48SJohn Johansen }; 317b5e95b48SJohn Johansen 318b5e95b48SJohn Johansen error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0, 319b5e95b48SJohn Johansen MAY_READ | AA_MAY_META_READ | MAY_WRITE | 320b5e95b48SJohn Johansen AA_MAY_META_WRITE | AA_MAY_DELETE, 321b5e95b48SJohn Johansen &cond); 322b5e95b48SJohn Johansen if (!error) 323b5e95b48SJohn Johansen error = aa_path_perm(OP_RENAME_DEST, profile, &new_path, 324b5e95b48SJohn Johansen 0, MAY_WRITE | AA_MAY_META_WRITE | 325b5e95b48SJohn Johansen AA_MAY_CREATE, &cond); 326b5e95b48SJohn Johansen 327b5e95b48SJohn Johansen } 328b5e95b48SJohn Johansen return error; 329b5e95b48SJohn Johansen } 330b5e95b48SJohn Johansen 331be01f9f2SAl Viro static int apparmor_path_chmod(const struct path *path, umode_t mode) 332b5e95b48SJohn Johansen { 333741aca71SAl Viro return common_perm_path(OP_CHMOD, path, AA_MAY_CHMOD); 334b5e95b48SJohn Johansen } 335b5e95b48SJohn Johansen 3367fd25dacSAl Viro static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) 337b5e95b48SJohn Johansen { 338741aca71SAl Viro return common_perm_path(OP_CHOWN, path, AA_MAY_CHOWN); 339b5e95b48SJohn Johansen } 340b5e95b48SJohn Johansen 3413f7036a0SAl Viro static int apparmor_inode_getattr(const struct path *path) 342b5e95b48SJohn Johansen { 343741aca71SAl Viro return common_perm_path(OP_GETATTR, path, AA_MAY_META_READ); 344b5e95b48SJohn Johansen } 345b5e95b48SJohn Johansen 34683d49856SEric Paris static int apparmor_file_open(struct file *file, const struct cred *cred) 347b5e95b48SJohn Johansen { 348b5e95b48SJohn Johansen struct aa_file_cxt *fcxt = file->f_security; 349b5e95b48SJohn Johansen struct aa_profile *profile; 350b5e95b48SJohn Johansen int error = 0; 351b5e95b48SJohn Johansen 352efeee83aSJohn Johansen if (!path_mediated_fs(file->f_path.dentry)) 353b5e95b48SJohn Johansen return 0; 354b5e95b48SJohn Johansen 355b5e95b48SJohn Johansen /* If in exec, permission is handled by bprm hooks. 356b5e95b48SJohn Johansen * Cache permissions granted by the previous exec check, with 357b5e95b48SJohn Johansen * implicit read and executable mmap which are required to 358b5e95b48SJohn Johansen * actually execute the image. 359b5e95b48SJohn Johansen */ 360b5e95b48SJohn Johansen if (current->in_execve) { 361b5e95b48SJohn Johansen fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; 362b5e95b48SJohn Johansen return 0; 363b5e95b48SJohn Johansen } 364b5e95b48SJohn Johansen 365b5e95b48SJohn Johansen profile = aa_cred_profile(cred); 366b5e95b48SJohn Johansen if (!unconfined(profile)) { 367496ad9aaSAl Viro struct inode *inode = file_inode(file); 368b5e95b48SJohn Johansen struct path_cond cond = { inode->i_uid, inode->i_mode }; 369b5e95b48SJohn Johansen 370b5e95b48SJohn Johansen error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0, 371b5e95b48SJohn Johansen aa_map_file_to_perms(file), &cond); 372b5e95b48SJohn Johansen /* todo cache full allowed permissions set and state */ 373b5e95b48SJohn Johansen fcxt->allow = aa_map_file_to_perms(file); 374b5e95b48SJohn Johansen } 375b5e95b48SJohn Johansen 376b5e95b48SJohn Johansen return error; 377b5e95b48SJohn Johansen } 378b5e95b48SJohn Johansen 379b5e95b48SJohn Johansen static int apparmor_file_alloc_security(struct file *file) 380b5e95b48SJohn Johansen { 381b5e95b48SJohn Johansen /* freed by apparmor_file_free_security */ 382b5e95b48SJohn Johansen file->f_security = aa_alloc_file_context(GFP_KERNEL); 383b5e95b48SJohn Johansen if (!file->f_security) 384b5e95b48SJohn Johansen return -ENOMEM; 385b5e95b48SJohn Johansen return 0; 386b5e95b48SJohn Johansen 387b5e95b48SJohn Johansen } 388b5e95b48SJohn Johansen 389b5e95b48SJohn Johansen static void apparmor_file_free_security(struct file *file) 390b5e95b48SJohn Johansen { 391b5e95b48SJohn Johansen struct aa_file_cxt *cxt = file->f_security; 392b5e95b48SJohn Johansen 393b5e95b48SJohn Johansen aa_free_file_context(cxt); 394b5e95b48SJohn Johansen } 395b5e95b48SJohn Johansen 396b5e95b48SJohn Johansen static int common_file_perm(int op, struct file *file, u32 mask) 397b5e95b48SJohn Johansen { 398b5e95b48SJohn Johansen struct aa_file_cxt *fcxt = file->f_security; 399b5e95b48SJohn Johansen struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred); 400b5e95b48SJohn Johansen int error = 0; 401b5e95b48SJohn Johansen 402b5e95b48SJohn Johansen BUG_ON(!fprofile); 403b5e95b48SJohn Johansen 404b5e95b48SJohn Johansen if (!file->f_path.mnt || 405efeee83aSJohn Johansen !path_mediated_fs(file->f_path.dentry)) 406b5e95b48SJohn Johansen return 0; 407b5e95b48SJohn Johansen 408b5e95b48SJohn Johansen profile = __aa_current_profile(); 409b5e95b48SJohn Johansen 410b5e95b48SJohn Johansen /* revalidate access, if task is unconfined, or the cached cred 411b5e95b48SJohn Johansen * doesn't match or if the request is for more permissions than 412b5e95b48SJohn Johansen * was granted. 413b5e95b48SJohn Johansen * 414b5e95b48SJohn Johansen * Note: the test for !unconfined(fprofile) is to handle file 415b5e95b48SJohn Johansen * delegation from unconfined tasks 416b5e95b48SJohn Johansen */ 417b5e95b48SJohn Johansen if (!unconfined(profile) && !unconfined(fprofile) && 418b5e95b48SJohn Johansen ((fprofile != profile) || (mask & ~fcxt->allow))) 419b5e95b48SJohn Johansen error = aa_file_perm(op, profile, file, mask); 420b5e95b48SJohn Johansen 421b5e95b48SJohn Johansen return error; 422b5e95b48SJohn Johansen } 423b5e95b48SJohn Johansen 424b5e95b48SJohn Johansen static int apparmor_file_permission(struct file *file, int mask) 425b5e95b48SJohn Johansen { 426b5e95b48SJohn Johansen return common_file_perm(OP_FPERM, file, mask); 427b5e95b48SJohn Johansen } 428b5e95b48SJohn Johansen 429b5e95b48SJohn Johansen static int apparmor_file_lock(struct file *file, unsigned int cmd) 430b5e95b48SJohn Johansen { 431b5e95b48SJohn Johansen u32 mask = AA_MAY_LOCK; 432b5e95b48SJohn Johansen 433b5e95b48SJohn Johansen if (cmd == F_WRLCK) 434b5e95b48SJohn Johansen mask |= MAY_WRITE; 435b5e95b48SJohn Johansen 436b5e95b48SJohn Johansen return common_file_perm(OP_FLOCK, file, mask); 437b5e95b48SJohn Johansen } 438b5e95b48SJohn Johansen 439b5e95b48SJohn Johansen static int common_mmap(int op, struct file *file, unsigned long prot, 440b5e95b48SJohn Johansen unsigned long flags) 441b5e95b48SJohn Johansen { 442b5e95b48SJohn Johansen int mask = 0; 443b5e95b48SJohn Johansen 444b5e95b48SJohn Johansen if (!file || !file->f_security) 445b5e95b48SJohn Johansen return 0; 446b5e95b48SJohn Johansen 447b5e95b48SJohn Johansen if (prot & PROT_READ) 448b5e95b48SJohn Johansen mask |= MAY_READ; 449b5e95b48SJohn Johansen /* 450b5e95b48SJohn Johansen * Private mappings don't require write perms since they don't 451b5e95b48SJohn Johansen * write back to the files 452b5e95b48SJohn Johansen */ 453b5e95b48SJohn Johansen if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) 454b5e95b48SJohn Johansen mask |= MAY_WRITE; 455b5e95b48SJohn Johansen if (prot & PROT_EXEC) 456b5e95b48SJohn Johansen mask |= AA_EXEC_MMAP; 457b5e95b48SJohn Johansen 458b5e95b48SJohn Johansen return common_file_perm(op, file, mask); 459b5e95b48SJohn Johansen } 460b5e95b48SJohn Johansen 461e5467859SAl Viro static int apparmor_mmap_file(struct file *file, unsigned long reqprot, 462e5467859SAl Viro unsigned long prot, unsigned long flags) 463b5e95b48SJohn Johansen { 464b5e95b48SJohn Johansen return common_mmap(OP_FMMAP, file, prot, flags); 465b5e95b48SJohn Johansen } 466b5e95b48SJohn Johansen 467b5e95b48SJohn Johansen static int apparmor_file_mprotect(struct vm_area_struct *vma, 468b5e95b48SJohn Johansen unsigned long reqprot, unsigned long prot) 469b5e95b48SJohn Johansen { 470b5e95b48SJohn Johansen return common_mmap(OP_FMPROT, vma->vm_file, prot, 471b5e95b48SJohn Johansen !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); 472b5e95b48SJohn Johansen } 473b5e95b48SJohn Johansen 474b5e95b48SJohn Johansen static int apparmor_getprocattr(struct task_struct *task, char *name, 475b5e95b48SJohn Johansen char **value) 476b5e95b48SJohn Johansen { 477b5e95b48SJohn Johansen int error = -ENOENT; 478b5e95b48SJohn Johansen /* released below */ 479b5e95b48SJohn Johansen const struct cred *cred = get_task_cred(task); 480214beacaSJohn Johansen struct aa_task_cxt *cxt = cred_cxt(cred); 48177b071b3SJohn Johansen struct aa_profile *profile = NULL; 482b5e95b48SJohn Johansen 483b5e95b48SJohn Johansen if (strcmp(name, "current") == 0) 48477b071b3SJohn Johansen profile = aa_get_newest_profile(cxt->profile); 485b5e95b48SJohn Johansen else if (strcmp(name, "prev") == 0 && cxt->previous) 48677b071b3SJohn Johansen profile = aa_get_newest_profile(cxt->previous); 487b5e95b48SJohn Johansen else if (strcmp(name, "exec") == 0 && cxt->onexec) 48877b071b3SJohn Johansen profile = aa_get_newest_profile(cxt->onexec); 489b5e95b48SJohn Johansen else 490b5e95b48SJohn Johansen error = -EINVAL; 491b5e95b48SJohn Johansen 49277b071b3SJohn Johansen if (profile) 49377b071b3SJohn Johansen error = aa_getprocattr(profile, value); 49477b071b3SJohn Johansen 49577b071b3SJohn Johansen aa_put_profile(profile); 496b5e95b48SJohn Johansen put_cred(cred); 497b5e95b48SJohn Johansen 498b5e95b48SJohn Johansen return error; 499b5e95b48SJohn Johansen } 500b5e95b48SJohn Johansen 501b5e95b48SJohn Johansen static int apparmor_setprocattr(struct task_struct *task, char *name, 502b5e95b48SJohn Johansen void *value, size_t size) 503b5e95b48SJohn Johansen { 5043eea57c2SJohn Johansen struct common_audit_data sa; 5053eea57c2SJohn Johansen struct apparmor_audit_data aad = {0,}; 506e89b8081SVegard Nossum char *command, *largs = NULL, *args = value; 507b5e95b48SJohn Johansen size_t arg_size; 508b5e95b48SJohn Johansen int error; 509b5e95b48SJohn Johansen 510b5e95b48SJohn Johansen if (size == 0) 511b5e95b48SJohn Johansen return -EINVAL; 512b5e95b48SJohn Johansen /* task can only write its own attributes */ 513b5e95b48SJohn Johansen if (current != task) 514b5e95b48SJohn Johansen return -EACCES; 515b5e95b48SJohn Johansen 516e89b8081SVegard Nossum /* AppArmor requires that the buffer must be null terminated atm */ 517e89b8081SVegard Nossum if (args[size - 1] != '\0') { 518e89b8081SVegard Nossum /* null terminate */ 519e89b8081SVegard Nossum largs = args = kmalloc(size + 1, GFP_KERNEL); 520e89b8081SVegard Nossum if (!args) 521e89b8081SVegard Nossum return -ENOMEM; 522e89b8081SVegard Nossum memcpy(args, value, size); 523e89b8081SVegard Nossum args[size] = '\0'; 524e89b8081SVegard Nossum } 525e89b8081SVegard Nossum 526e89b8081SVegard Nossum error = -EINVAL; 527b5e95b48SJohn Johansen args = strim(args); 528b5e95b48SJohn Johansen command = strsep(&args, " "); 529b5e95b48SJohn Johansen if (!args) 530e89b8081SVegard Nossum goto out; 531b5e95b48SJohn Johansen args = skip_spaces(args); 532b5e95b48SJohn Johansen if (!*args) 533e89b8081SVegard Nossum goto out; 534b5e95b48SJohn Johansen 535d4d03f74SJohn Johansen arg_size = size - (args - (largs ? largs : (char *) value)); 536b5e95b48SJohn Johansen if (strcmp(name, "current") == 0) { 537b5e95b48SJohn Johansen if (strcmp(command, "changehat") == 0) { 538b5e95b48SJohn Johansen error = aa_setprocattr_changehat(args, arg_size, 539b5e95b48SJohn Johansen !AA_DO_TEST); 540b5e95b48SJohn Johansen } else if (strcmp(command, "permhat") == 0) { 541b5e95b48SJohn Johansen error = aa_setprocattr_changehat(args, arg_size, 542b5e95b48SJohn Johansen AA_DO_TEST); 543b5e95b48SJohn Johansen } else if (strcmp(command, "changeprofile") == 0) { 544b5e95b48SJohn Johansen error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, 545b5e95b48SJohn Johansen !AA_DO_TEST); 546b5e95b48SJohn Johansen } else if (strcmp(command, "permprofile") == 0) { 547b5e95b48SJohn Johansen error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, 548b5e95b48SJohn Johansen AA_DO_TEST); 5493eea57c2SJohn Johansen } else 5503eea57c2SJohn Johansen goto fail; 551b5e95b48SJohn Johansen } else if (strcmp(name, "exec") == 0) { 5523eea57c2SJohn Johansen if (strcmp(command, "exec") == 0) 553b5e95b48SJohn Johansen error = aa_setprocattr_changeprofile(args, AA_ONEXEC, 554b5e95b48SJohn Johansen !AA_DO_TEST); 5553eea57c2SJohn Johansen else 5563eea57c2SJohn Johansen goto fail; 5573eea57c2SJohn Johansen } else 558b5e95b48SJohn Johansen /* only support the "current" and "exec" process attributes */ 559e89b8081SVegard Nossum goto fail; 5603eea57c2SJohn Johansen 561b5e95b48SJohn Johansen if (!error) 562b5e95b48SJohn Johansen error = size; 563e89b8081SVegard Nossum out: 564e89b8081SVegard Nossum kfree(largs); 565b5e95b48SJohn Johansen return error; 5663eea57c2SJohn Johansen 5673eea57c2SJohn Johansen fail: 5683eea57c2SJohn Johansen sa.type = LSM_AUDIT_DATA_NONE; 5693eea57c2SJohn Johansen sa.aad = &aad; 5703eea57c2SJohn Johansen aad.profile = aa_current_profile(); 5713eea57c2SJohn Johansen aad.op = OP_SETPROCATTR; 5723eea57c2SJohn Johansen aad.info = name; 573e89b8081SVegard Nossum aad.error = error = -EINVAL; 5743eea57c2SJohn Johansen aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); 575e89b8081SVegard Nossum goto out; 576b5e95b48SJohn Johansen } 577b5e95b48SJohn Johansen 5787cb4dc9fSJiri Slaby static int apparmor_task_setrlimit(struct task_struct *task, 5797cb4dc9fSJiri Slaby unsigned int resource, struct rlimit *new_rlim) 580b5e95b48SJohn Johansen { 5811780f2d3SJohn Johansen struct aa_profile *profile = __aa_current_profile(); 582b5e95b48SJohn Johansen int error = 0; 583b5e95b48SJohn Johansen 584b5e95b48SJohn Johansen if (!unconfined(profile)) 5853a2dc838SJohn Johansen error = aa_task_setrlimit(profile, task, resource, new_rlim); 586b5e95b48SJohn Johansen 587b5e95b48SJohn Johansen return error; 588b5e95b48SJohn Johansen } 589b5e95b48SJohn Johansen 590b1d9e6b0SCasey Schaufler static struct security_hook_list apparmor_hooks[] = { 591e20b043aSCasey Schaufler LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), 592e20b043aSCasey Schaufler LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), 593e20b043aSCasey Schaufler LSM_HOOK_INIT(capget, apparmor_capget), 594e20b043aSCasey Schaufler LSM_HOOK_INIT(capable, apparmor_capable), 595b5e95b48SJohn Johansen 596e20b043aSCasey Schaufler LSM_HOOK_INIT(path_link, apparmor_path_link), 597e20b043aSCasey Schaufler LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), 598e20b043aSCasey Schaufler LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), 599e20b043aSCasey Schaufler LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), 600e20b043aSCasey Schaufler LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), 601e20b043aSCasey Schaufler LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), 602e20b043aSCasey Schaufler LSM_HOOK_INIT(path_rename, apparmor_path_rename), 603e20b043aSCasey Schaufler LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), 604e20b043aSCasey Schaufler LSM_HOOK_INIT(path_chown, apparmor_path_chown), 605e20b043aSCasey Schaufler LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), 606e20b043aSCasey Schaufler LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), 607b5e95b48SJohn Johansen 608e20b043aSCasey Schaufler LSM_HOOK_INIT(file_open, apparmor_file_open), 609e20b043aSCasey Schaufler LSM_HOOK_INIT(file_permission, apparmor_file_permission), 610e20b043aSCasey Schaufler LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), 611e20b043aSCasey Schaufler LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), 612e20b043aSCasey Schaufler LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), 613e20b043aSCasey Schaufler LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), 614e20b043aSCasey Schaufler LSM_HOOK_INIT(file_lock, apparmor_file_lock), 615b5e95b48SJohn Johansen 616e20b043aSCasey Schaufler LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), 617e20b043aSCasey Schaufler LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), 618b5e95b48SJohn Johansen 619e20b043aSCasey Schaufler LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), 620e20b043aSCasey Schaufler LSM_HOOK_INIT(cred_free, apparmor_cred_free), 621e20b043aSCasey Schaufler LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), 622e20b043aSCasey Schaufler LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), 623b5e95b48SJohn Johansen 624e20b043aSCasey Schaufler LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), 625e20b043aSCasey Schaufler LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), 626e20b043aSCasey Schaufler LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), 627e20b043aSCasey Schaufler LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), 628b5e95b48SJohn Johansen 629e20b043aSCasey Schaufler LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), 630b5e95b48SJohn Johansen }; 631b5e95b48SJohn Johansen 632b5e95b48SJohn Johansen /* 633b5e95b48SJohn Johansen * AppArmor sysfs module parameters 634b5e95b48SJohn Johansen */ 635b5e95b48SJohn Johansen 636101d6c82SStephen Rothwell static int param_set_aabool(const char *val, const struct kernel_param *kp); 637101d6c82SStephen Rothwell static int param_get_aabool(char *buffer, const struct kernel_param *kp); 638b8aa09fdSRusty Russell #define param_check_aabool param_check_bool 6399c27847dSLuis R. Rodriguez static const struct kernel_param_ops param_ops_aabool = { 6406a4c2643SJani Nikula .flags = KERNEL_PARAM_OPS_FL_NOARG, 641101d6c82SStephen Rothwell .set = param_set_aabool, 642101d6c82SStephen Rothwell .get = param_get_aabool 643101d6c82SStephen Rothwell }; 644b5e95b48SJohn Johansen 645101d6c82SStephen Rothwell static int param_set_aauint(const char *val, const struct kernel_param *kp); 646101d6c82SStephen Rothwell static int param_get_aauint(char *buffer, const struct kernel_param *kp); 647b8aa09fdSRusty Russell #define param_check_aauint param_check_uint 6489c27847dSLuis R. Rodriguez static const struct kernel_param_ops param_ops_aauint = { 649101d6c82SStephen Rothwell .set = param_set_aauint, 650101d6c82SStephen Rothwell .get = param_get_aauint 651101d6c82SStephen Rothwell }; 652b5e95b48SJohn Johansen 653101d6c82SStephen Rothwell static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); 654101d6c82SStephen Rothwell static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); 655b8aa09fdSRusty Russell #define param_check_aalockpolicy param_check_bool 6569c27847dSLuis R. Rodriguez static const struct kernel_param_ops param_ops_aalockpolicy = { 6576a4c2643SJani Nikula .flags = KERNEL_PARAM_OPS_FL_NOARG, 658101d6c82SStephen Rothwell .set = param_set_aalockpolicy, 659101d6c82SStephen Rothwell .get = param_get_aalockpolicy 660101d6c82SStephen Rothwell }; 661b5e95b48SJohn Johansen 662b5e95b48SJohn Johansen static int param_set_audit(const char *val, struct kernel_param *kp); 663b5e95b48SJohn Johansen static int param_get_audit(char *buffer, struct kernel_param *kp); 664b5e95b48SJohn Johansen 665b5e95b48SJohn Johansen static int param_set_mode(const char *val, struct kernel_param *kp); 666b5e95b48SJohn Johansen static int param_get_mode(char *buffer, struct kernel_param *kp); 667b5e95b48SJohn Johansen 668b5e95b48SJohn Johansen /* Flag values, also controllable via /sys/module/apparmor/parameters 669b5e95b48SJohn Johansen * We define special types as we want to do additional mediation. 670b5e95b48SJohn Johansen */ 671b5e95b48SJohn Johansen 672b5e95b48SJohn Johansen /* AppArmor global enforcement switch - complain, enforce, kill */ 673b5e95b48SJohn Johansen enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; 674b5e95b48SJohn Johansen module_param_call(mode, param_set_mode, param_get_mode, 675b5e95b48SJohn Johansen &aa_g_profile_mode, S_IRUSR | S_IWUSR); 676b5e95b48SJohn Johansen 6777616ac70SArnd Bergmann #ifdef CONFIG_SECURITY_APPARMOR_HASH 6786059f71fSJohn Johansen /* whether policy verification hashing is enabled */ 6797616ac70SArnd Bergmann bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); 6806059f71fSJohn Johansen module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); 6817616ac70SArnd Bergmann #endif 6826059f71fSJohn Johansen 683b5e95b48SJohn Johansen /* Debug mode */ 684680cd62eSJohn Johansen bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_DEBUG_MESSAGES); 685b5e95b48SJohn Johansen module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); 686b5e95b48SJohn Johansen 687b5e95b48SJohn Johansen /* Audit mode */ 688b5e95b48SJohn Johansen enum audit_mode aa_g_audit; 689b5e95b48SJohn Johansen module_param_call(audit, param_set_audit, param_get_audit, 690b5e95b48SJohn Johansen &aa_g_audit, S_IRUSR | S_IWUSR); 691b5e95b48SJohn Johansen 692b5e95b48SJohn Johansen /* Determines if audit header is included in audited messages. This 693b5e95b48SJohn Johansen * provides more context if the audit daemon is not running 694b5e95b48SJohn Johansen */ 69590ab5ee9SRusty Russell bool aa_g_audit_header = 1; 696b5e95b48SJohn Johansen module_param_named(audit_header, aa_g_audit_header, aabool, 697b5e95b48SJohn Johansen S_IRUSR | S_IWUSR); 698b5e95b48SJohn Johansen 699b5e95b48SJohn Johansen /* lock out loading/removal of policy 700b5e95b48SJohn Johansen * TODO: add in at boot loading of policy, which is the only way to 701b5e95b48SJohn Johansen * load policy, if lock_policy is set 702b5e95b48SJohn Johansen */ 70390ab5ee9SRusty Russell bool aa_g_lock_policy; 704b5e95b48SJohn Johansen module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, 705b5e95b48SJohn Johansen S_IRUSR | S_IWUSR); 706b5e95b48SJohn Johansen 707b5e95b48SJohn Johansen /* Syscall logging mode */ 70890ab5ee9SRusty Russell bool aa_g_logsyscall; 709b5e95b48SJohn Johansen module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); 710b5e95b48SJohn Johansen 711b5e95b48SJohn Johansen /* Maximum pathname length before accesses will start getting rejected */ 712b5e95b48SJohn Johansen unsigned int aa_g_path_max = 2 * PATH_MAX; 713b5e95b48SJohn Johansen module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR); 714b5e95b48SJohn Johansen 715b5e95b48SJohn Johansen /* Determines how paranoid loading of policy is and how much verification 716b5e95b48SJohn Johansen * on the loaded policy is done. 717*abbf8734SJohn Johansen * DEPRECATED: read only as strict checking of load is always done now 718*abbf8734SJohn Johansen * that none root users (user namespaces) can load policy. 719b5e95b48SJohn Johansen */ 72090ab5ee9SRusty Russell bool aa_g_paranoid_load = 1; 721*abbf8734SJohn Johansen module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); 722b5e95b48SJohn Johansen 723b5e95b48SJohn Johansen /* Boot time disable flag */ 72490ab5ee9SRusty Russell static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; 725c611616cSJohn Johansen module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); 726b5e95b48SJohn Johansen 727b5e95b48SJohn Johansen static int __init apparmor_enabled_setup(char *str) 728b5e95b48SJohn Johansen { 729b5e95b48SJohn Johansen unsigned long enabled; 73029707b20SJingoo Han int error = kstrtoul(str, 0, &enabled); 731b5e95b48SJohn Johansen if (!error) 732b5e95b48SJohn Johansen apparmor_enabled = enabled ? 1 : 0; 733b5e95b48SJohn Johansen return 1; 734b5e95b48SJohn Johansen } 735b5e95b48SJohn Johansen 736b5e95b48SJohn Johansen __setup("apparmor=", apparmor_enabled_setup); 737b5e95b48SJohn Johansen 738b5e95b48SJohn Johansen /* set global flag turning off the ability to load policy */ 739101d6c82SStephen Rothwell static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) 740b5e95b48SJohn Johansen { 74158acf9d9SJohn Johansen if (!policy_admin_capable()) 742b5e95b48SJohn Johansen return -EPERM; 743b5e95b48SJohn Johansen return param_set_bool(val, kp); 744b5e95b48SJohn Johansen } 745b5e95b48SJohn Johansen 746101d6c82SStephen Rothwell static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) 747b5e95b48SJohn Johansen { 74858acf9d9SJohn Johansen if (!policy_view_capable()) 749b5e95b48SJohn Johansen return -EPERM; 750b5e95b48SJohn Johansen return param_get_bool(buffer, kp); 751b5e95b48SJohn Johansen } 752b5e95b48SJohn Johansen 753101d6c82SStephen Rothwell static int param_set_aabool(const char *val, const struct kernel_param *kp) 754b5e95b48SJohn Johansen { 75558acf9d9SJohn Johansen if (!policy_admin_capable()) 756b5e95b48SJohn Johansen return -EPERM; 757b5e95b48SJohn Johansen return param_set_bool(val, kp); 758b5e95b48SJohn Johansen } 759b5e95b48SJohn Johansen 760101d6c82SStephen Rothwell static int param_get_aabool(char *buffer, const struct kernel_param *kp) 761b5e95b48SJohn Johansen { 76258acf9d9SJohn Johansen if (!policy_view_capable()) 763b5e95b48SJohn Johansen return -EPERM; 764b5e95b48SJohn Johansen return param_get_bool(buffer, kp); 765b5e95b48SJohn Johansen } 766b5e95b48SJohn Johansen 767101d6c82SStephen Rothwell static int param_set_aauint(const char *val, const struct kernel_param *kp) 768b5e95b48SJohn Johansen { 76958acf9d9SJohn Johansen if (!policy_admin_capable()) 770b5e95b48SJohn Johansen return -EPERM; 771b5e95b48SJohn Johansen return param_set_uint(val, kp); 772b5e95b48SJohn Johansen } 773b5e95b48SJohn Johansen 774101d6c82SStephen Rothwell static int param_get_aauint(char *buffer, const struct kernel_param *kp) 775b5e95b48SJohn Johansen { 77658acf9d9SJohn Johansen if (!policy_view_capable()) 777b5e95b48SJohn Johansen return -EPERM; 778b5e95b48SJohn Johansen return param_get_uint(buffer, kp); 779b5e95b48SJohn Johansen } 780b5e95b48SJohn Johansen 781b5e95b48SJohn Johansen static int param_get_audit(char *buffer, struct kernel_param *kp) 782b5e95b48SJohn Johansen { 78358acf9d9SJohn Johansen if (!policy_view_capable()) 784b5e95b48SJohn Johansen return -EPERM; 785b5e95b48SJohn Johansen 786b5e95b48SJohn Johansen if (!apparmor_enabled) 787b5e95b48SJohn Johansen return -EINVAL; 788b5e95b48SJohn Johansen 789b5e95b48SJohn Johansen return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); 790b5e95b48SJohn Johansen } 791b5e95b48SJohn Johansen 792b5e95b48SJohn Johansen static int param_set_audit(const char *val, struct kernel_param *kp) 793b5e95b48SJohn Johansen { 794b5e95b48SJohn Johansen int i; 79558acf9d9SJohn Johansen if (!policy_admin_capable()) 796b5e95b48SJohn Johansen return -EPERM; 797b5e95b48SJohn Johansen 798b5e95b48SJohn Johansen if (!apparmor_enabled) 799b5e95b48SJohn Johansen return -EINVAL; 800b5e95b48SJohn Johansen 801b5e95b48SJohn Johansen if (!val) 802b5e95b48SJohn Johansen return -EINVAL; 803b5e95b48SJohn Johansen 804b5e95b48SJohn Johansen for (i = 0; i < AUDIT_MAX_INDEX; i++) { 805b5e95b48SJohn Johansen if (strcmp(val, audit_mode_names[i]) == 0) { 806b5e95b48SJohn Johansen aa_g_audit = i; 807b5e95b48SJohn Johansen return 0; 808b5e95b48SJohn Johansen } 809b5e95b48SJohn Johansen } 810b5e95b48SJohn Johansen 811b5e95b48SJohn Johansen return -EINVAL; 812b5e95b48SJohn Johansen } 813b5e95b48SJohn Johansen 814b5e95b48SJohn Johansen static int param_get_mode(char *buffer, struct kernel_param *kp) 815b5e95b48SJohn Johansen { 81658acf9d9SJohn Johansen if (!policy_admin_capable()) 817b5e95b48SJohn Johansen return -EPERM; 818b5e95b48SJohn Johansen 819b5e95b48SJohn Johansen if (!apparmor_enabled) 820b5e95b48SJohn Johansen return -EINVAL; 821b5e95b48SJohn Johansen 8220d259f04SJohn Johansen return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); 823b5e95b48SJohn Johansen } 824b5e95b48SJohn Johansen 825b5e95b48SJohn Johansen static int param_set_mode(const char *val, struct kernel_param *kp) 826b5e95b48SJohn Johansen { 827b5e95b48SJohn Johansen int i; 82858acf9d9SJohn Johansen if (!policy_admin_capable()) 829b5e95b48SJohn Johansen return -EPERM; 830b5e95b48SJohn Johansen 831b5e95b48SJohn Johansen if (!apparmor_enabled) 832b5e95b48SJohn Johansen return -EINVAL; 833b5e95b48SJohn Johansen 834b5e95b48SJohn Johansen if (!val) 835b5e95b48SJohn Johansen return -EINVAL; 836b5e95b48SJohn Johansen 8370d259f04SJohn Johansen for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { 8380d259f04SJohn Johansen if (strcmp(val, aa_profile_mode_names[i]) == 0) { 839b5e95b48SJohn Johansen aa_g_profile_mode = i; 840b5e95b48SJohn Johansen return 0; 841b5e95b48SJohn Johansen } 842b5e95b48SJohn Johansen } 843b5e95b48SJohn Johansen 844b5e95b48SJohn Johansen return -EINVAL; 845b5e95b48SJohn Johansen } 846b5e95b48SJohn Johansen 847b5e95b48SJohn Johansen /* 848b5e95b48SJohn Johansen * AppArmor init functions 849b5e95b48SJohn Johansen */ 850b5e95b48SJohn Johansen 851b5e95b48SJohn Johansen /** 852b5e95b48SJohn Johansen * set_init_cxt - set a task context and profile on the first task. 853b5e95b48SJohn Johansen * 854b5e95b48SJohn Johansen * TODO: allow setting an alternate profile than unconfined 855b5e95b48SJohn Johansen */ 856b5e95b48SJohn Johansen static int __init set_init_cxt(void) 857b5e95b48SJohn Johansen { 858b5e95b48SJohn Johansen struct cred *cred = (struct cred *)current->real_cred; 859b5e95b48SJohn Johansen struct aa_task_cxt *cxt; 860b5e95b48SJohn Johansen 861b5e95b48SJohn Johansen cxt = aa_alloc_task_context(GFP_KERNEL); 862b5e95b48SJohn Johansen if (!cxt) 863b5e95b48SJohn Johansen return -ENOMEM; 864b5e95b48SJohn Johansen 865b5e95b48SJohn Johansen cxt->profile = aa_get_profile(root_ns->unconfined); 866214beacaSJohn Johansen cred_cxt(cred) = cxt; 867b5e95b48SJohn Johansen 868b5e95b48SJohn Johansen return 0; 869b5e95b48SJohn Johansen } 870b5e95b48SJohn Johansen 871b5e95b48SJohn Johansen static int __init apparmor_init(void) 872b5e95b48SJohn Johansen { 873b5e95b48SJohn Johansen int error; 874b5e95b48SJohn Johansen 875b1d9e6b0SCasey Schaufler if (!apparmor_enabled || !security_module_enable("apparmor")) { 876b5e95b48SJohn Johansen aa_info_message("AppArmor disabled by boot time parameter"); 877b5e95b48SJohn Johansen apparmor_enabled = 0; 878b5e95b48SJohn Johansen return 0; 879b5e95b48SJohn Johansen } 880b5e95b48SJohn Johansen 881b5e95b48SJohn Johansen error = aa_alloc_root_ns(); 882b5e95b48SJohn Johansen if (error) { 883b5e95b48SJohn Johansen AA_ERROR("Unable to allocate default profile namespace\n"); 884b5e95b48SJohn Johansen goto alloc_out; 885b5e95b48SJohn Johansen } 886b5e95b48SJohn Johansen 887b5e95b48SJohn Johansen error = set_init_cxt(); 888b5e95b48SJohn Johansen if (error) { 889b5e95b48SJohn Johansen AA_ERROR("Failed to set context on init task\n"); 890b1d9e6b0SCasey Schaufler aa_free_root_ns(); 891b1d9e6b0SCasey Schaufler goto alloc_out; 892b5e95b48SJohn Johansen } 893b1d9e6b0SCasey Schaufler security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks)); 894b5e95b48SJohn Johansen 895b5e95b48SJohn Johansen /* Report that AppArmor successfully initialized */ 896b5e95b48SJohn Johansen apparmor_initialized = 1; 897b5e95b48SJohn Johansen if (aa_g_profile_mode == APPARMOR_COMPLAIN) 898b5e95b48SJohn Johansen aa_info_message("AppArmor initialized: complain mode enabled"); 899b5e95b48SJohn Johansen else if (aa_g_profile_mode == APPARMOR_KILL) 900b5e95b48SJohn Johansen aa_info_message("AppArmor initialized: kill mode enabled"); 901b5e95b48SJohn Johansen else 902b5e95b48SJohn Johansen aa_info_message("AppArmor initialized"); 903b5e95b48SJohn Johansen 904b5e95b48SJohn Johansen return error; 905b5e95b48SJohn Johansen 906b5e95b48SJohn Johansen alloc_out: 907b5e95b48SJohn Johansen aa_destroy_aafs(); 908b5e95b48SJohn Johansen 909b5e95b48SJohn Johansen apparmor_enabled = 0; 910b5e95b48SJohn Johansen return error; 911b5e95b48SJohn Johansen } 912b5e95b48SJohn Johansen 913b5e95b48SJohn Johansen security_initcall(apparmor_init); 914