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> 26e025be0fSWilliam Hua #include <linux/kmemleak.h> 27b5e95b48SJohn Johansen #include <net/sock.h> 28b5e95b48SJohn Johansen 29b5e95b48SJohn Johansen #include "include/apparmor.h" 30b5e95b48SJohn Johansen #include "include/apparmorfs.h" 31b5e95b48SJohn Johansen #include "include/audit.h" 32b5e95b48SJohn Johansen #include "include/capability.h" 33b5e95b48SJohn Johansen #include "include/context.h" 34b5e95b48SJohn Johansen #include "include/file.h" 35b5e95b48SJohn Johansen #include "include/ipc.h" 36b5e95b48SJohn Johansen #include "include/path.h" 37*637f688dSJohn Johansen #include "include/label.h" 38b5e95b48SJohn Johansen #include "include/policy.h" 39cff281f6SJohn Johansen #include "include/policy_ns.h" 40b5e95b48SJohn Johansen #include "include/procattr.h" 41b5e95b48SJohn Johansen 42b5e95b48SJohn Johansen /* Flag indicating whether initialization completed */ 43545de8feSJohn Johansen int apparmor_initialized; 44b5e95b48SJohn Johansen 45d4669f0bSJohn Johansen DEFINE_PER_CPU(struct aa_buffers, aa_buffers); 46d4669f0bSJohn Johansen 47d4669f0bSJohn Johansen 48b5e95b48SJohn Johansen /* 49b5e95b48SJohn Johansen * LSM hook functions 50b5e95b48SJohn Johansen */ 51b5e95b48SJohn Johansen 52b5e95b48SJohn Johansen /* 53*637f688dSJohn Johansen * free the associated aa_task_ctx and put its labels 54b5e95b48SJohn Johansen */ 55b5e95b48SJohn Johansen static void apparmor_cred_free(struct cred *cred) 56b5e95b48SJohn Johansen { 5755a26ebfSJohn Johansen aa_free_task_context(cred_ctx(cred)); 5855a26ebfSJohn Johansen cred_ctx(cred) = NULL; 59b5e95b48SJohn Johansen } 60b5e95b48SJohn Johansen 61b5e95b48SJohn Johansen /* 62b5e95b48SJohn Johansen * allocate the apparmor part of blank credentials 63b5e95b48SJohn Johansen */ 64b5e95b48SJohn Johansen static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) 65b5e95b48SJohn Johansen { 66b5e95b48SJohn Johansen /* freed by apparmor_cred_free */ 6755a26ebfSJohn Johansen struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); 6855a26ebfSJohn Johansen 6955a26ebfSJohn Johansen if (!ctx) 70b5e95b48SJohn Johansen return -ENOMEM; 71b5e95b48SJohn Johansen 7255a26ebfSJohn Johansen cred_ctx(cred) = ctx; 73b5e95b48SJohn Johansen return 0; 74b5e95b48SJohn Johansen } 75b5e95b48SJohn Johansen 76b5e95b48SJohn Johansen /* 7755a26ebfSJohn Johansen * prepare new aa_task_ctx for modification by prepare_cred block 78b5e95b48SJohn Johansen */ 79b5e95b48SJohn Johansen static int apparmor_cred_prepare(struct cred *new, const struct cred *old, 80b5e95b48SJohn Johansen gfp_t gfp) 81b5e95b48SJohn Johansen { 82b5e95b48SJohn Johansen /* freed by apparmor_cred_free */ 8355a26ebfSJohn Johansen struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); 8455a26ebfSJohn Johansen 8555a26ebfSJohn Johansen if (!ctx) 86b5e95b48SJohn Johansen return -ENOMEM; 87b5e95b48SJohn Johansen 8855a26ebfSJohn Johansen aa_dup_task_context(ctx, cred_ctx(old)); 8955a26ebfSJohn Johansen cred_ctx(new) = ctx; 90b5e95b48SJohn Johansen return 0; 91b5e95b48SJohn Johansen } 92b5e95b48SJohn Johansen 93b5e95b48SJohn Johansen /* 94b5e95b48SJohn Johansen * transfer the apparmor data to a blank set of creds 95b5e95b48SJohn Johansen */ 96b5e95b48SJohn Johansen static void apparmor_cred_transfer(struct cred *new, const struct cred *old) 97b5e95b48SJohn Johansen { 9855a26ebfSJohn Johansen const struct aa_task_ctx *old_ctx = cred_ctx(old); 9955a26ebfSJohn Johansen struct aa_task_ctx *new_ctx = cred_ctx(new); 100b5e95b48SJohn Johansen 10155a26ebfSJohn Johansen aa_dup_task_context(new_ctx, old_ctx); 102b5e95b48SJohn Johansen } 103b5e95b48SJohn Johansen 104b5e95b48SJohn Johansen static int apparmor_ptrace_access_check(struct task_struct *child, 105b5e95b48SJohn Johansen unsigned int mode) 106b5e95b48SJohn Johansen { 107b5e95b48SJohn Johansen return aa_ptrace(current, child, mode); 108b5e95b48SJohn Johansen } 109b5e95b48SJohn Johansen 110b5e95b48SJohn Johansen static int apparmor_ptrace_traceme(struct task_struct *parent) 111b5e95b48SJohn Johansen { 112b5e95b48SJohn Johansen return aa_ptrace(parent, current, PTRACE_MODE_ATTACH); 113b5e95b48SJohn Johansen } 114b5e95b48SJohn Johansen 115b5e95b48SJohn Johansen /* Derived from security/commoncap.c:cap_capget */ 116b5e95b48SJohn Johansen static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, 117b5e95b48SJohn Johansen kernel_cap_t *inheritable, kernel_cap_t *permitted) 118b5e95b48SJohn Johansen { 119*637f688dSJohn Johansen struct aa_label *label; 120b5e95b48SJohn Johansen struct aa_profile *profile; 121b5e95b48SJohn Johansen const struct cred *cred; 122b5e95b48SJohn Johansen 123b5e95b48SJohn Johansen rcu_read_lock(); 124b5e95b48SJohn Johansen cred = __task_cred(target); 125*637f688dSJohn Johansen label = aa_get_newest_cred_label(cred); 126*637f688dSJohn Johansen profile = labels_profile(label); 127b1d9e6b0SCasey Schaufler /* 128b1d9e6b0SCasey Schaufler * cap_capget is stacked ahead of this and will 129b1d9e6b0SCasey Schaufler * initialize effective and permitted. 130b1d9e6b0SCasey Schaufler */ 131*637f688dSJohn Johansen if (!profile_unconfined(profile) && !COMPLAIN_MODE(profile)) { 132b5e95b48SJohn Johansen *effective = cap_intersect(*effective, profile->caps.allow); 133b5e95b48SJohn Johansen *permitted = cap_intersect(*permitted, profile->caps.allow); 134b5e95b48SJohn Johansen } 135b5e95b48SJohn Johansen rcu_read_unlock(); 136*637f688dSJohn Johansen aa_put_label(label); 137b5e95b48SJohn Johansen 138b5e95b48SJohn Johansen return 0; 139b5e95b48SJohn Johansen } 140b5e95b48SJohn Johansen 1416a9de491SEric Paris static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, 1426a9de491SEric Paris int cap, int audit) 143b5e95b48SJohn Johansen { 144*637f688dSJohn Johansen struct aa_label *label; 145b1d9e6b0SCasey Schaufler int error = 0; 146b1d9e6b0SCasey Schaufler 147*637f688dSJohn Johansen label = aa_get_newest_cred_label(cred); 148*637f688dSJohn Johansen if (!unconfined(label)) 149*637f688dSJohn Johansen error = aa_capable(labels_profile(label), cap, audit); 150*637f688dSJohn Johansen aa_put_label(label); 151cf797c0eSJohn Johansen 152b5e95b48SJohn Johansen return error; 153b5e95b48SJohn Johansen } 154b5e95b48SJohn Johansen 155b5e95b48SJohn Johansen /** 156b5e95b48SJohn Johansen * common_perm - basic common permission check wrapper fn for paths 157b5e95b48SJohn Johansen * @op: operation being checked 158b5e95b48SJohn Johansen * @path: path to check permission of (NOT NULL) 159b5e95b48SJohn Johansen * @mask: requested permissions mask 160b5e95b48SJohn Johansen * @cond: conditional info for the permission request (NOT NULL) 161b5e95b48SJohn Johansen * 162b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 163b5e95b48SJohn Johansen */ 16447f6e5ccSJohn Johansen static int common_perm(const char *op, const struct path *path, u32 mask, 165b5e95b48SJohn Johansen struct path_cond *cond) 166b5e95b48SJohn Johansen { 167*637f688dSJohn Johansen struct aa_label *label; 168b5e95b48SJohn Johansen int error = 0; 169b5e95b48SJohn Johansen 170*637f688dSJohn Johansen label = __begin_current_label_crit_section(); 171*637f688dSJohn Johansen if (!unconfined(label)) 172*637f688dSJohn Johansen error = aa_path_perm(op, labels_profile(label), path, 0, mask, 173*637f688dSJohn Johansen cond); 174*637f688dSJohn Johansen __end_current_label_crit_section(label); 175b5e95b48SJohn Johansen 176b5e95b48SJohn Johansen return error; 177b5e95b48SJohn Johansen } 178b5e95b48SJohn Johansen 179b5e95b48SJohn Johansen /** 18031f75bfeSJohn Johansen * common_perm_cond - common permission wrapper around inode cond 18131f75bfeSJohn Johansen * @op: operation being checked 18231f75bfeSJohn Johansen * @path: location to check (NOT NULL) 18331f75bfeSJohn Johansen * @mask: requested permissions mask 18431f75bfeSJohn Johansen * 18531f75bfeSJohn Johansen * Returns: %0 else error code if error or permission denied 18631f75bfeSJohn Johansen */ 18731f75bfeSJohn Johansen static int common_perm_cond(const char *op, const struct path *path, u32 mask) 18831f75bfeSJohn Johansen { 18931f75bfeSJohn Johansen struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, 19031f75bfeSJohn Johansen d_backing_inode(path->dentry)->i_mode 19131f75bfeSJohn Johansen }; 19231f75bfeSJohn Johansen 19331f75bfeSJohn Johansen if (!path_mediated_fs(path->dentry)) 19431f75bfeSJohn Johansen return 0; 19531f75bfeSJohn Johansen 19631f75bfeSJohn Johansen return common_perm(op, path, mask, &cond); 19731f75bfeSJohn Johansen } 19831f75bfeSJohn Johansen 19931f75bfeSJohn Johansen /** 200b5e95b48SJohn Johansen * common_perm_dir_dentry - common permission wrapper when path is dir, dentry 201b5e95b48SJohn Johansen * @op: operation being checked 202b5e95b48SJohn Johansen * @dir: directory of the dentry (NOT NULL) 203b5e95b48SJohn Johansen * @dentry: dentry to check (NOT NULL) 204b5e95b48SJohn Johansen * @mask: requested permissions mask 205b5e95b48SJohn Johansen * @cond: conditional info for the permission request (NOT NULL) 206b5e95b48SJohn Johansen * 207b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 208b5e95b48SJohn Johansen */ 20947f6e5ccSJohn Johansen static int common_perm_dir_dentry(const char *op, const struct path *dir, 210b5e95b48SJohn Johansen struct dentry *dentry, u32 mask, 211b5e95b48SJohn Johansen struct path_cond *cond) 212b5e95b48SJohn Johansen { 2138486adf0SKees Cook struct path path = { .mnt = dir->mnt, .dentry = dentry }; 214b5e95b48SJohn Johansen 215b5e95b48SJohn Johansen return common_perm(op, &path, mask, cond); 216b5e95b48SJohn Johansen } 217b5e95b48SJohn Johansen 218b5e95b48SJohn Johansen /** 219b5e95b48SJohn Johansen * common_perm_rm - common permission wrapper for operations doing rm 220b5e95b48SJohn Johansen * @op: operation being checked 221b5e95b48SJohn Johansen * @dir: directory that the dentry is in (NOT NULL) 222b5e95b48SJohn Johansen * @dentry: dentry being rm'd (NOT NULL) 223b5e95b48SJohn Johansen * @mask: requested permission mask 224b5e95b48SJohn Johansen * 225b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 226b5e95b48SJohn Johansen */ 22747f6e5ccSJohn Johansen static int common_perm_rm(const char *op, const struct path *dir, 228b5e95b48SJohn Johansen struct dentry *dentry, u32 mask) 229b5e95b48SJohn Johansen { 230c6f493d6SDavid Howells struct inode *inode = d_backing_inode(dentry); 231b5e95b48SJohn Johansen struct path_cond cond = { }; 232b5e95b48SJohn Johansen 233efeee83aSJohn Johansen if (!inode || !path_mediated_fs(dentry)) 234b5e95b48SJohn Johansen return 0; 235b5e95b48SJohn Johansen 236b5e95b48SJohn Johansen cond.uid = inode->i_uid; 237b5e95b48SJohn Johansen cond.mode = inode->i_mode; 238b5e95b48SJohn Johansen 239b5e95b48SJohn Johansen return common_perm_dir_dentry(op, dir, dentry, mask, &cond); 240b5e95b48SJohn Johansen } 241b5e95b48SJohn Johansen 242b5e95b48SJohn Johansen /** 243b5e95b48SJohn Johansen * common_perm_create - common permission wrapper for operations doing create 244b5e95b48SJohn Johansen * @op: operation being checked 245b5e95b48SJohn Johansen * @dir: directory that dentry will be created in (NOT NULL) 246b5e95b48SJohn Johansen * @dentry: dentry to create (NOT NULL) 247b5e95b48SJohn Johansen * @mask: request permission mask 248b5e95b48SJohn Johansen * @mode: created file mode 249b5e95b48SJohn Johansen * 250b5e95b48SJohn Johansen * Returns: %0 else error code if error or permission denied 251b5e95b48SJohn Johansen */ 25247f6e5ccSJohn Johansen static int common_perm_create(const char *op, const struct path *dir, 253d6b49f7aSAl Viro struct dentry *dentry, u32 mask, umode_t mode) 254b5e95b48SJohn Johansen { 255b5e95b48SJohn Johansen struct path_cond cond = { current_fsuid(), mode }; 256b5e95b48SJohn Johansen 257efeee83aSJohn Johansen if (!path_mediated_fs(dir->dentry)) 258b5e95b48SJohn Johansen return 0; 259b5e95b48SJohn Johansen 260b5e95b48SJohn Johansen return common_perm_dir_dentry(op, dir, dentry, mask, &cond); 261b5e95b48SJohn Johansen } 262b5e95b48SJohn Johansen 263989f74e0SAl Viro static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) 264b5e95b48SJohn Johansen { 265b5e95b48SJohn Johansen return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); 266b5e95b48SJohn Johansen } 267b5e95b48SJohn Johansen 268d3607752SAl Viro static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, 2694572befeSAl Viro umode_t mode) 270b5e95b48SJohn Johansen { 271b5e95b48SJohn Johansen return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, 272b5e95b48SJohn Johansen S_IFDIR); 273b5e95b48SJohn Johansen } 274b5e95b48SJohn Johansen 275989f74e0SAl Viro static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) 276b5e95b48SJohn Johansen { 277b5e95b48SJohn Johansen return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); 278b5e95b48SJohn Johansen } 279b5e95b48SJohn Johansen 280d3607752SAl Viro static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, 28104fc66e7SAl Viro umode_t mode, unsigned int dev) 282b5e95b48SJohn Johansen { 283b5e95b48SJohn Johansen return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); 284b5e95b48SJohn Johansen } 285b5e95b48SJohn Johansen 28681f4c506SAl Viro static int apparmor_path_truncate(const struct path *path) 287b5e95b48SJohn Johansen { 288e53cfe6cSJohn Johansen return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); 289b5e95b48SJohn Johansen } 290b5e95b48SJohn Johansen 291d3607752SAl Viro static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, 292b5e95b48SJohn Johansen const char *old_name) 293b5e95b48SJohn Johansen { 294b5e95b48SJohn Johansen return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, 295b5e95b48SJohn Johansen S_IFLNK); 296b5e95b48SJohn Johansen } 297b5e95b48SJohn Johansen 2983ccee46aSAl Viro static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, 299b5e95b48SJohn Johansen struct dentry *new_dentry) 300b5e95b48SJohn Johansen { 301*637f688dSJohn Johansen struct aa_label *label; 302b5e95b48SJohn Johansen int error = 0; 303b5e95b48SJohn Johansen 304efeee83aSJohn Johansen if (!path_mediated_fs(old_dentry)) 305b5e95b48SJohn Johansen return 0; 306b5e95b48SJohn Johansen 307*637f688dSJohn Johansen label = begin_current_label_crit_section(); 308*637f688dSJohn Johansen if (!unconfined(label)) 309*637f688dSJohn Johansen error = aa_path_link(labels_profile(label), old_dentry, new_dir, 310*637f688dSJohn Johansen new_dentry); 311*637f688dSJohn Johansen end_current_label_crit_section(label); 312cf797c0eSJohn Johansen 313b5e95b48SJohn Johansen return error; 314b5e95b48SJohn Johansen } 315b5e95b48SJohn Johansen 3163ccee46aSAl Viro static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, 3173ccee46aSAl Viro const struct path *new_dir, struct dentry *new_dentry) 318b5e95b48SJohn Johansen { 319*637f688dSJohn Johansen struct aa_label *label; 320b5e95b48SJohn Johansen int error = 0; 321b5e95b48SJohn Johansen 322efeee83aSJohn Johansen if (!path_mediated_fs(old_dentry)) 323b5e95b48SJohn Johansen return 0; 324b5e95b48SJohn Johansen 325*637f688dSJohn Johansen label = begin_current_label_crit_section(); 326*637f688dSJohn Johansen if (!unconfined(label)) { 3278486adf0SKees Cook struct path old_path = { .mnt = old_dir->mnt, 3288486adf0SKees Cook .dentry = old_dentry }; 3298486adf0SKees Cook struct path new_path = { .mnt = new_dir->mnt, 3308486adf0SKees Cook .dentry = new_dentry }; 331c6f493d6SDavid Howells struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, 332c6f493d6SDavid Howells d_backing_inode(old_dentry)->i_mode 333b5e95b48SJohn Johansen }; 334b5e95b48SJohn Johansen 335*637f688dSJohn Johansen error = aa_path_perm(OP_RENAME_SRC, labels_profile(label), 336*637f688dSJohn Johansen &old_path, 0, 337e53cfe6cSJohn Johansen MAY_READ | AA_MAY_GETATTR | MAY_WRITE | 338e53cfe6cSJohn Johansen AA_MAY_SETATTR | AA_MAY_DELETE, 339b5e95b48SJohn Johansen &cond); 340b5e95b48SJohn Johansen if (!error) 341*637f688dSJohn Johansen error = aa_path_perm(OP_RENAME_DEST, 342*637f688dSJohn Johansen labels_profile(label), 343*637f688dSJohn Johansen &new_path, 344e53cfe6cSJohn Johansen 0, MAY_WRITE | AA_MAY_SETATTR | 345b5e95b48SJohn Johansen AA_MAY_CREATE, &cond); 346b5e95b48SJohn Johansen 347b5e95b48SJohn Johansen } 348*637f688dSJohn Johansen end_current_label_crit_section(label); 349cf797c0eSJohn Johansen 350b5e95b48SJohn Johansen return error; 351b5e95b48SJohn Johansen } 352b5e95b48SJohn Johansen 353be01f9f2SAl Viro static int apparmor_path_chmod(const struct path *path, umode_t mode) 354b5e95b48SJohn Johansen { 35531f75bfeSJohn Johansen return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); 356b5e95b48SJohn Johansen } 357b5e95b48SJohn Johansen 3587fd25dacSAl Viro static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) 359b5e95b48SJohn Johansen { 36031f75bfeSJohn Johansen return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); 361b5e95b48SJohn Johansen } 362b5e95b48SJohn Johansen 3633f7036a0SAl Viro static int apparmor_inode_getattr(const struct path *path) 364b5e95b48SJohn Johansen { 365e53cfe6cSJohn Johansen return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); 366b5e95b48SJohn Johansen } 367b5e95b48SJohn Johansen 36883d49856SEric Paris static int apparmor_file_open(struct file *file, const struct cred *cred) 369b5e95b48SJohn Johansen { 370*637f688dSJohn Johansen struct aa_file_ctx *fctx = file_ctx(file); 371*637f688dSJohn Johansen struct aa_label *label; 372b5e95b48SJohn Johansen int error = 0; 373b5e95b48SJohn Johansen 374efeee83aSJohn Johansen if (!path_mediated_fs(file->f_path.dentry)) 375b5e95b48SJohn Johansen return 0; 376b5e95b48SJohn Johansen 377b5e95b48SJohn Johansen /* If in exec, permission is handled by bprm hooks. 378b5e95b48SJohn Johansen * Cache permissions granted by the previous exec check, with 379b5e95b48SJohn Johansen * implicit read and executable mmap which are required to 380b5e95b48SJohn Johansen * actually execute the image. 381b5e95b48SJohn Johansen */ 382b5e95b48SJohn Johansen if (current->in_execve) { 38355a26ebfSJohn Johansen fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; 384b5e95b48SJohn Johansen return 0; 385b5e95b48SJohn Johansen } 386b5e95b48SJohn Johansen 387*637f688dSJohn Johansen label = aa_get_newest_cred_label(cred); 388*637f688dSJohn Johansen if (!unconfined(label)) { 389496ad9aaSAl Viro struct inode *inode = file_inode(file); 390b5e95b48SJohn Johansen struct path_cond cond = { inode->i_uid, inode->i_mode }; 391b5e95b48SJohn Johansen 392*637f688dSJohn Johansen error = aa_path_perm(OP_OPEN, labels_profile(label), 393*637f688dSJohn Johansen &file->f_path, 0, 394b5e95b48SJohn Johansen aa_map_file_to_perms(file), &cond); 395b5e95b48SJohn Johansen /* todo cache full allowed permissions set and state */ 39655a26ebfSJohn Johansen fctx->allow = aa_map_file_to_perms(file); 397b5e95b48SJohn Johansen } 398*637f688dSJohn Johansen aa_put_label(label); 399b5e95b48SJohn Johansen 400b5e95b48SJohn Johansen return error; 401b5e95b48SJohn Johansen } 402b5e95b48SJohn Johansen 403b5e95b48SJohn Johansen static int apparmor_file_alloc_security(struct file *file) 404b5e95b48SJohn Johansen { 405cf797c0eSJohn Johansen int error = 0; 406cf797c0eSJohn Johansen 407b5e95b48SJohn Johansen /* freed by apparmor_file_free_security */ 408*637f688dSJohn Johansen struct aa_label *label = begin_current_label_crit_section(); 4092835a13bSJohn Johansen file->f_security = aa_alloc_file_ctx(GFP_KERNEL); 4102835a13bSJohn Johansen if (!file_ctx(file)) 4112835a13bSJohn Johansen error = -ENOMEM; 412*637f688dSJohn Johansen end_current_label_crit_section(label); 413b5e95b48SJohn Johansen 414cf797c0eSJohn Johansen return error; 415b5e95b48SJohn Johansen } 416b5e95b48SJohn Johansen 417b5e95b48SJohn Johansen static void apparmor_file_free_security(struct file *file) 418b5e95b48SJohn Johansen { 4192835a13bSJohn Johansen aa_free_file_ctx(file_ctx(file)); 420b5e95b48SJohn Johansen } 421b5e95b48SJohn Johansen 42247f6e5ccSJohn Johansen static int common_file_perm(const char *op, struct file *file, u32 mask) 423b5e95b48SJohn Johansen { 42455a26ebfSJohn Johansen struct aa_file_ctx *fctx = file->f_security; 425*637f688dSJohn Johansen struct aa_label *label, *flabel; 426b5e95b48SJohn Johansen int error = 0; 427b5e95b48SJohn Johansen 428192ca6b5SJohn Johansen /* don't reaudit files closed during inheritance */ 429192ca6b5SJohn Johansen if (file->f_path.dentry == aa_null.dentry) 430192ca6b5SJohn Johansen return -EACCES; 431192ca6b5SJohn Johansen 432*637f688dSJohn Johansen flabel = aa_cred_raw_label(file->f_cred); 433*637f688dSJohn Johansen AA_BUG(!flabel); 434b5e95b48SJohn Johansen 435b5e95b48SJohn Johansen if (!file->f_path.mnt || 436efeee83aSJohn Johansen !path_mediated_fs(file->f_path.dentry)) 437b5e95b48SJohn Johansen return 0; 438b5e95b48SJohn Johansen 439*637f688dSJohn Johansen label = __begin_current_label_crit_section(); 440b5e95b48SJohn Johansen 441b5e95b48SJohn Johansen /* revalidate access, if task is unconfined, or the cached cred 442b5e95b48SJohn Johansen * doesn't match or if the request is for more permissions than 443b5e95b48SJohn Johansen * was granted. 444b5e95b48SJohn Johansen * 445b5e95b48SJohn Johansen * Note: the test for !unconfined(fprofile) is to handle file 446b5e95b48SJohn Johansen * delegation from unconfined tasks 447b5e95b48SJohn Johansen */ 448*637f688dSJohn Johansen if (!unconfined(label) && !unconfined(flabel) && 449*637f688dSJohn Johansen ((flabel != label) || (mask & ~fctx->allow))) 450*637f688dSJohn Johansen error = aa_file_perm(op, labels_profile(label), file, mask); 451*637f688dSJohn Johansen __end_current_label_crit_section(label); 452b5e95b48SJohn Johansen 453b5e95b48SJohn Johansen return error; 454b5e95b48SJohn Johansen } 455b5e95b48SJohn Johansen 456b5e95b48SJohn Johansen static int apparmor_file_permission(struct file *file, int mask) 457b5e95b48SJohn Johansen { 458b5e95b48SJohn Johansen return common_file_perm(OP_FPERM, file, mask); 459b5e95b48SJohn Johansen } 460b5e95b48SJohn Johansen 461b5e95b48SJohn Johansen static int apparmor_file_lock(struct file *file, unsigned int cmd) 462b5e95b48SJohn Johansen { 463b5e95b48SJohn Johansen u32 mask = AA_MAY_LOCK; 464b5e95b48SJohn Johansen 465b5e95b48SJohn Johansen if (cmd == F_WRLCK) 466b5e95b48SJohn Johansen mask |= MAY_WRITE; 467b5e95b48SJohn Johansen 468b5e95b48SJohn Johansen return common_file_perm(OP_FLOCK, file, mask); 469b5e95b48SJohn Johansen } 470b5e95b48SJohn Johansen 47147f6e5ccSJohn Johansen static int common_mmap(const char *op, struct file *file, unsigned long prot, 472b5e95b48SJohn Johansen unsigned long flags) 473b5e95b48SJohn Johansen { 474b5e95b48SJohn Johansen int mask = 0; 475b5e95b48SJohn Johansen 476*637f688dSJohn Johansen if (!file || !file_ctx(file)) 477b5e95b48SJohn Johansen return 0; 478b5e95b48SJohn Johansen 479b5e95b48SJohn Johansen if (prot & PROT_READ) 480b5e95b48SJohn Johansen mask |= MAY_READ; 481b5e95b48SJohn Johansen /* 482b5e95b48SJohn Johansen * Private mappings don't require write perms since they don't 483b5e95b48SJohn Johansen * write back to the files 484b5e95b48SJohn Johansen */ 485b5e95b48SJohn Johansen if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) 486b5e95b48SJohn Johansen mask |= MAY_WRITE; 487b5e95b48SJohn Johansen if (prot & PROT_EXEC) 488b5e95b48SJohn Johansen mask |= AA_EXEC_MMAP; 489b5e95b48SJohn Johansen 490b5e95b48SJohn Johansen return common_file_perm(op, file, mask); 491b5e95b48SJohn Johansen } 492b5e95b48SJohn Johansen 493e5467859SAl Viro static int apparmor_mmap_file(struct file *file, unsigned long reqprot, 494e5467859SAl Viro unsigned long prot, unsigned long flags) 495b5e95b48SJohn Johansen { 496b5e95b48SJohn Johansen return common_mmap(OP_FMMAP, file, prot, flags); 497b5e95b48SJohn Johansen } 498b5e95b48SJohn Johansen 499b5e95b48SJohn Johansen static int apparmor_file_mprotect(struct vm_area_struct *vma, 500b5e95b48SJohn Johansen unsigned long reqprot, unsigned long prot) 501b5e95b48SJohn Johansen { 502b5e95b48SJohn Johansen return common_mmap(OP_FMPROT, vma->vm_file, prot, 503b5e95b48SJohn Johansen !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); 504b5e95b48SJohn Johansen } 505b5e95b48SJohn Johansen 506b5e95b48SJohn Johansen static int apparmor_getprocattr(struct task_struct *task, char *name, 507b5e95b48SJohn Johansen char **value) 508b5e95b48SJohn Johansen { 509b5e95b48SJohn Johansen int error = -ENOENT; 510b5e95b48SJohn Johansen /* released below */ 511b5e95b48SJohn Johansen const struct cred *cred = get_task_cred(task); 51255a26ebfSJohn Johansen struct aa_task_ctx *ctx = cred_ctx(cred); 513*637f688dSJohn Johansen struct aa_label *label = NULL; 514b5e95b48SJohn Johansen 515b5e95b48SJohn Johansen if (strcmp(name, "current") == 0) 516*637f688dSJohn Johansen label = aa_get_newest_label(ctx->label); 51755a26ebfSJohn Johansen else if (strcmp(name, "prev") == 0 && ctx->previous) 518*637f688dSJohn Johansen label = aa_get_newest_label(ctx->previous); 51955a26ebfSJohn Johansen else if (strcmp(name, "exec") == 0 && ctx->onexec) 520*637f688dSJohn Johansen label = aa_get_newest_label(ctx->onexec); 521b5e95b48SJohn Johansen else 522b5e95b48SJohn Johansen error = -EINVAL; 523b5e95b48SJohn Johansen 524*637f688dSJohn Johansen if (label) 525*637f688dSJohn Johansen error = aa_getprocattr(labels_profile(label), value); 52677b071b3SJohn Johansen 527*637f688dSJohn Johansen aa_put_label(label); 528b5e95b48SJohn Johansen put_cred(cred); 529b5e95b48SJohn Johansen 530b5e95b48SJohn Johansen return error; 531b5e95b48SJohn Johansen } 532b5e95b48SJohn Johansen 533b21507e2SStephen Smalley static int apparmor_setprocattr(const char *name, void *value, 534b21507e2SStephen Smalley size_t size) 535b5e95b48SJohn Johansen { 536e89b8081SVegard Nossum char *command, *largs = NULL, *args = value; 537b5e95b48SJohn Johansen size_t arg_size; 538b5e95b48SJohn Johansen int error; 539ef88a7acSJohn Johansen DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); 540b5e95b48SJohn Johansen 541b5e95b48SJohn Johansen if (size == 0) 542b5e95b48SJohn Johansen return -EINVAL; 543b5e95b48SJohn Johansen 544e89b8081SVegard Nossum /* AppArmor requires that the buffer must be null terminated atm */ 545e89b8081SVegard Nossum if (args[size - 1] != '\0') { 546e89b8081SVegard Nossum /* null terminate */ 547e89b8081SVegard Nossum largs = args = kmalloc(size + 1, GFP_KERNEL); 548e89b8081SVegard Nossum if (!args) 549e89b8081SVegard Nossum return -ENOMEM; 550e89b8081SVegard Nossum memcpy(args, value, size); 551e89b8081SVegard Nossum args[size] = '\0'; 552e89b8081SVegard Nossum } 553e89b8081SVegard Nossum 554e89b8081SVegard Nossum error = -EINVAL; 555b5e95b48SJohn Johansen args = strim(args); 556b5e95b48SJohn Johansen command = strsep(&args, " "); 557b5e95b48SJohn Johansen if (!args) 558e89b8081SVegard Nossum goto out; 559b5e95b48SJohn Johansen args = skip_spaces(args); 560b5e95b48SJohn Johansen if (!*args) 561e89b8081SVegard Nossum goto out; 562b5e95b48SJohn Johansen 563d4d03f74SJohn Johansen arg_size = size - (args - (largs ? largs : (char *) value)); 564b5e95b48SJohn Johansen if (strcmp(name, "current") == 0) { 565b5e95b48SJohn Johansen if (strcmp(command, "changehat") == 0) { 566b5e95b48SJohn Johansen error = aa_setprocattr_changehat(args, arg_size, 567df8073c6SJohn Johansen AA_CHANGE_NOFLAGS); 568b5e95b48SJohn Johansen } else if (strcmp(command, "permhat") == 0) { 569b5e95b48SJohn Johansen error = aa_setprocattr_changehat(args, arg_size, 570df8073c6SJohn Johansen AA_CHANGE_TEST); 571b5e95b48SJohn Johansen } else if (strcmp(command, "changeprofile") == 0) { 572df8073c6SJohn Johansen error = aa_change_profile(args, AA_CHANGE_NOFLAGS); 573b5e95b48SJohn Johansen } else if (strcmp(command, "permprofile") == 0) { 574df8073c6SJohn Johansen error = aa_change_profile(args, AA_CHANGE_TEST); 5753eea57c2SJohn Johansen } else 5763eea57c2SJohn Johansen goto fail; 577b5e95b48SJohn Johansen } else if (strcmp(name, "exec") == 0) { 5783eea57c2SJohn Johansen if (strcmp(command, "exec") == 0) 579df8073c6SJohn Johansen error = aa_change_profile(args, AA_CHANGE_ONEXEC); 5803eea57c2SJohn Johansen else 5813eea57c2SJohn Johansen goto fail; 5823eea57c2SJohn Johansen } else 583b5e95b48SJohn Johansen /* only support the "current" and "exec" process attributes */ 584e89b8081SVegard Nossum goto fail; 5853eea57c2SJohn Johansen 586b5e95b48SJohn Johansen if (!error) 587b5e95b48SJohn Johansen error = size; 588e89b8081SVegard Nossum out: 589e89b8081SVegard Nossum kfree(largs); 590b5e95b48SJohn Johansen return error; 5913eea57c2SJohn Johansen 5923eea57c2SJohn Johansen fail: 593*637f688dSJohn Johansen aad(&sa)->label = begin_current_label_crit_section(); 594ef88a7acSJohn Johansen aad(&sa)->info = name; 595ef88a7acSJohn Johansen aad(&sa)->error = error = -EINVAL; 5963eea57c2SJohn Johansen aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); 597*637f688dSJohn Johansen end_current_label_crit_section(aad(&sa)->label); 598e89b8081SVegard Nossum goto out; 599b5e95b48SJohn Johansen } 600b5e95b48SJohn Johansen 601fe864821SJohn Johansen /** 602fe864821SJohn Johansen * apparmor_bprm_committing_creds - do task cleanup on committing new creds 603fe864821SJohn Johansen * @bprm: binprm for the exec (NOT NULL) 604fe864821SJohn Johansen */ 605fe864821SJohn Johansen static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) 606fe864821SJohn Johansen { 607*637f688dSJohn Johansen struct aa_label *label = aa_current_raw_label(); 608fe864821SJohn Johansen struct aa_task_ctx *new_ctx = cred_ctx(bprm->cred); 609fe864821SJohn Johansen 610fe864821SJohn Johansen /* bail out if unconfined or not changing profile */ 611*637f688dSJohn Johansen if ((new_ctx->label->proxy == label->proxy) || 612*637f688dSJohn Johansen (unconfined(new_ctx->label))) 613fe864821SJohn Johansen return; 614fe864821SJohn Johansen 615192ca6b5SJohn Johansen aa_inherit_files(bprm->cred, current->files); 616192ca6b5SJohn Johansen 617fe864821SJohn Johansen current->pdeath_signal = 0; 618fe864821SJohn Johansen 619*637f688dSJohn Johansen /* reset soft limits and set hard limits for the new label */ 620*637f688dSJohn Johansen __aa_transition_rlimits(labels_profile(label), 621*637f688dSJohn Johansen labels_profile(new_ctx->label)); 622fe864821SJohn Johansen } 623fe864821SJohn Johansen 624fe864821SJohn Johansen /** 625fe864821SJohn Johansen * apparmor_bprm_committed_cred - do cleanup after new creds committed 626fe864821SJohn Johansen * @bprm: binprm for the exec (NOT NULL) 627fe864821SJohn Johansen */ 628fe864821SJohn Johansen static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) 629fe864821SJohn Johansen { 630fe864821SJohn Johansen /* TODO: cleanup signals - ipc mediation */ 631fe864821SJohn Johansen return; 632fe864821SJohn Johansen } 633fe864821SJohn Johansen 6347cb4dc9fSJiri Slaby static int apparmor_task_setrlimit(struct task_struct *task, 6357cb4dc9fSJiri Slaby unsigned int resource, struct rlimit *new_rlim) 636b5e95b48SJohn Johansen { 637*637f688dSJohn Johansen struct aa_label *label = __begin_current_label_crit_section(); 638b5e95b48SJohn Johansen int error = 0; 639b5e95b48SJohn Johansen 640*637f688dSJohn Johansen if (!unconfined(label)) 641*637f688dSJohn Johansen error = aa_task_setrlimit(labels_profile(label), task, 642*637f688dSJohn Johansen resource, new_rlim); 643*637f688dSJohn Johansen __end_current_label_crit_section(label); 644b5e95b48SJohn Johansen 645b5e95b48SJohn Johansen return error; 646b5e95b48SJohn Johansen } 647b5e95b48SJohn Johansen 648ca97d939SJames Morris static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { 649e20b043aSCasey Schaufler LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), 650e20b043aSCasey Schaufler LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), 651e20b043aSCasey Schaufler LSM_HOOK_INIT(capget, apparmor_capget), 652e20b043aSCasey Schaufler LSM_HOOK_INIT(capable, apparmor_capable), 653b5e95b48SJohn Johansen 654e20b043aSCasey Schaufler LSM_HOOK_INIT(path_link, apparmor_path_link), 655e20b043aSCasey Schaufler LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), 656e20b043aSCasey Schaufler LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), 657e20b043aSCasey Schaufler LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), 658e20b043aSCasey Schaufler LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), 659e20b043aSCasey Schaufler LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), 660e20b043aSCasey Schaufler LSM_HOOK_INIT(path_rename, apparmor_path_rename), 661e20b043aSCasey Schaufler LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), 662e20b043aSCasey Schaufler LSM_HOOK_INIT(path_chown, apparmor_path_chown), 663e20b043aSCasey Schaufler LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), 664e20b043aSCasey Schaufler LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), 665b5e95b48SJohn Johansen 666e20b043aSCasey Schaufler LSM_HOOK_INIT(file_open, apparmor_file_open), 667e20b043aSCasey Schaufler LSM_HOOK_INIT(file_permission, apparmor_file_permission), 668e20b043aSCasey Schaufler LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), 669e20b043aSCasey Schaufler LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), 670e20b043aSCasey Schaufler LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), 671e20b043aSCasey Schaufler LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), 672e20b043aSCasey Schaufler LSM_HOOK_INIT(file_lock, apparmor_file_lock), 673b5e95b48SJohn Johansen 674e20b043aSCasey Schaufler LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), 675e20b043aSCasey Schaufler LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), 676b5e95b48SJohn Johansen 677e20b043aSCasey Schaufler LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), 678e20b043aSCasey Schaufler LSM_HOOK_INIT(cred_free, apparmor_cred_free), 679e20b043aSCasey Schaufler LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), 680e20b043aSCasey Schaufler LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), 681b5e95b48SJohn Johansen 682e20b043aSCasey Schaufler LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), 683e20b043aSCasey Schaufler LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), 684e20b043aSCasey Schaufler LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), 685e20b043aSCasey Schaufler LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), 686b5e95b48SJohn Johansen 687e20b043aSCasey Schaufler LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), 688b5e95b48SJohn Johansen }; 689b5e95b48SJohn Johansen 690b5e95b48SJohn Johansen /* 691b5e95b48SJohn Johansen * AppArmor sysfs module parameters 692b5e95b48SJohn Johansen */ 693b5e95b48SJohn Johansen 694101d6c82SStephen Rothwell static int param_set_aabool(const char *val, const struct kernel_param *kp); 695101d6c82SStephen Rothwell static int param_get_aabool(char *buffer, const struct kernel_param *kp); 696b8aa09fdSRusty Russell #define param_check_aabool param_check_bool 6979c27847dSLuis R. Rodriguez static const struct kernel_param_ops param_ops_aabool = { 6986a4c2643SJani Nikula .flags = KERNEL_PARAM_OPS_FL_NOARG, 699101d6c82SStephen Rothwell .set = param_set_aabool, 700101d6c82SStephen Rothwell .get = param_get_aabool 701101d6c82SStephen Rothwell }; 702b5e95b48SJohn Johansen 703101d6c82SStephen Rothwell static int param_set_aauint(const char *val, const struct kernel_param *kp); 704101d6c82SStephen Rothwell static int param_get_aauint(char *buffer, const struct kernel_param *kp); 705b8aa09fdSRusty Russell #define param_check_aauint param_check_uint 7069c27847dSLuis R. Rodriguez static const struct kernel_param_ops param_ops_aauint = { 707101d6c82SStephen Rothwell .set = param_set_aauint, 708101d6c82SStephen Rothwell .get = param_get_aauint 709101d6c82SStephen Rothwell }; 710b5e95b48SJohn Johansen 711101d6c82SStephen Rothwell static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); 712101d6c82SStephen Rothwell static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); 713b8aa09fdSRusty Russell #define param_check_aalockpolicy param_check_bool 7149c27847dSLuis R. Rodriguez static const struct kernel_param_ops param_ops_aalockpolicy = { 7156a4c2643SJani Nikula .flags = KERNEL_PARAM_OPS_FL_NOARG, 716101d6c82SStephen Rothwell .set = param_set_aalockpolicy, 717101d6c82SStephen Rothwell .get = param_get_aalockpolicy 718101d6c82SStephen Rothwell }; 719b5e95b48SJohn Johansen 720b5e95b48SJohn Johansen static int param_set_audit(const char *val, struct kernel_param *kp); 721b5e95b48SJohn Johansen static int param_get_audit(char *buffer, struct kernel_param *kp); 722b5e95b48SJohn Johansen 723b5e95b48SJohn Johansen static int param_set_mode(const char *val, struct kernel_param *kp); 724b5e95b48SJohn Johansen static int param_get_mode(char *buffer, struct kernel_param *kp); 725b5e95b48SJohn Johansen 726b5e95b48SJohn Johansen /* Flag values, also controllable via /sys/module/apparmor/parameters 727b5e95b48SJohn Johansen * We define special types as we want to do additional mediation. 728b5e95b48SJohn Johansen */ 729b5e95b48SJohn Johansen 730b5e95b48SJohn Johansen /* AppArmor global enforcement switch - complain, enforce, kill */ 731b5e95b48SJohn Johansen enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; 732b5e95b48SJohn Johansen module_param_call(mode, param_set_mode, param_get_mode, 733b5e95b48SJohn Johansen &aa_g_profile_mode, S_IRUSR | S_IWUSR); 734b5e95b48SJohn Johansen 7356059f71fSJohn Johansen /* whether policy verification hashing is enabled */ 7367616ac70SArnd Bergmann bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); 7373ccb76c5SJohn Johansen #ifdef CONFIG_SECURITY_APPARMOR_HASH 7386059f71fSJohn Johansen module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); 7397616ac70SArnd Bergmann #endif 7406059f71fSJohn Johansen 741b5e95b48SJohn Johansen /* Debug mode */ 742eea7a05fSValentin Rothberg bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); 743b5e95b48SJohn Johansen module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); 744b5e95b48SJohn Johansen 745b5e95b48SJohn Johansen /* Audit mode */ 746b5e95b48SJohn Johansen enum audit_mode aa_g_audit; 747b5e95b48SJohn Johansen module_param_call(audit, param_set_audit, param_get_audit, 748b5e95b48SJohn Johansen &aa_g_audit, S_IRUSR | S_IWUSR); 749b5e95b48SJohn Johansen 750b5e95b48SJohn Johansen /* Determines if audit header is included in audited messages. This 751b5e95b48SJohn Johansen * provides more context if the audit daemon is not running 752b5e95b48SJohn Johansen */ 75390ab5ee9SRusty Russell bool aa_g_audit_header = 1; 754b5e95b48SJohn Johansen module_param_named(audit_header, aa_g_audit_header, aabool, 755b5e95b48SJohn Johansen S_IRUSR | S_IWUSR); 756b5e95b48SJohn Johansen 757b5e95b48SJohn Johansen /* lock out loading/removal of policy 758b5e95b48SJohn Johansen * TODO: add in at boot loading of policy, which is the only way to 759b5e95b48SJohn Johansen * load policy, if lock_policy is set 760b5e95b48SJohn Johansen */ 76190ab5ee9SRusty Russell bool aa_g_lock_policy; 762b5e95b48SJohn Johansen module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, 763b5e95b48SJohn Johansen S_IRUSR | S_IWUSR); 764b5e95b48SJohn Johansen 765b5e95b48SJohn Johansen /* Syscall logging mode */ 76690ab5ee9SRusty Russell bool aa_g_logsyscall; 767b5e95b48SJohn Johansen module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); 768b5e95b48SJohn Johansen 769b5e95b48SJohn Johansen /* Maximum pathname length before accesses will start getting rejected */ 770b5e95b48SJohn Johansen unsigned int aa_g_path_max = 2 * PATH_MAX; 771622f6e32SJohn Johansen module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); 772b5e95b48SJohn Johansen 773b5e95b48SJohn Johansen /* Determines how paranoid loading of policy is and how much verification 774b5e95b48SJohn Johansen * on the loaded policy is done. 775abbf8734SJohn Johansen * DEPRECATED: read only as strict checking of load is always done now 776abbf8734SJohn Johansen * that none root users (user namespaces) can load policy. 777b5e95b48SJohn Johansen */ 77890ab5ee9SRusty Russell bool aa_g_paranoid_load = 1; 779abbf8734SJohn Johansen module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); 780b5e95b48SJohn Johansen 781b5e95b48SJohn Johansen /* Boot time disable flag */ 78290ab5ee9SRusty Russell static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; 783c611616cSJohn Johansen module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); 784b5e95b48SJohn Johansen 785b5e95b48SJohn Johansen static int __init apparmor_enabled_setup(char *str) 786b5e95b48SJohn Johansen { 787b5e95b48SJohn Johansen unsigned long enabled; 78829707b20SJingoo Han int error = kstrtoul(str, 0, &enabled); 789b5e95b48SJohn Johansen if (!error) 790b5e95b48SJohn Johansen apparmor_enabled = enabled ? 1 : 0; 791b5e95b48SJohn Johansen return 1; 792b5e95b48SJohn Johansen } 793b5e95b48SJohn Johansen 794b5e95b48SJohn Johansen __setup("apparmor=", apparmor_enabled_setup); 795b5e95b48SJohn Johansen 796b5e95b48SJohn Johansen /* set global flag turning off the ability to load policy */ 797101d6c82SStephen Rothwell static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) 798b5e95b48SJohn Johansen { 799545de8feSJohn Johansen if (!apparmor_enabled) 800545de8feSJohn Johansen return -EINVAL; 801545de8feSJohn Johansen if (apparmor_initialized && !policy_admin_capable(NULL)) 802b5e95b48SJohn Johansen return -EPERM; 803b5e95b48SJohn Johansen return param_set_bool(val, kp); 804b5e95b48SJohn Johansen } 805b5e95b48SJohn Johansen 806101d6c82SStephen Rothwell static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) 807b5e95b48SJohn Johansen { 808ca4bd5aeSJohn Johansen if (!apparmor_enabled) 809ca4bd5aeSJohn Johansen return -EINVAL; 810545de8feSJohn Johansen if (apparmor_initialized && !policy_view_capable(NULL)) 811545de8feSJohn Johansen return -EPERM; 812b5e95b48SJohn Johansen return param_get_bool(buffer, kp); 813b5e95b48SJohn Johansen } 814b5e95b48SJohn Johansen 815101d6c82SStephen Rothwell static int param_set_aabool(const char *val, const struct kernel_param *kp) 816b5e95b48SJohn Johansen { 817ca4bd5aeSJohn Johansen if (!apparmor_enabled) 818ca4bd5aeSJohn Johansen return -EINVAL; 819545de8feSJohn Johansen if (apparmor_initialized && !policy_admin_capable(NULL)) 820545de8feSJohn Johansen return -EPERM; 821b5e95b48SJohn Johansen return param_set_bool(val, kp); 822b5e95b48SJohn Johansen } 823b5e95b48SJohn Johansen 824101d6c82SStephen Rothwell static int param_get_aabool(char *buffer, const struct kernel_param *kp) 825b5e95b48SJohn Johansen { 826ca4bd5aeSJohn Johansen if (!apparmor_enabled) 827ca4bd5aeSJohn Johansen return -EINVAL; 828545de8feSJohn Johansen if (apparmor_initialized && !policy_view_capable(NULL)) 829545de8feSJohn Johansen return -EPERM; 830b5e95b48SJohn Johansen return param_get_bool(buffer, kp); 831b5e95b48SJohn Johansen } 832b5e95b48SJohn Johansen 833101d6c82SStephen Rothwell static int param_set_aauint(const char *val, const struct kernel_param *kp) 834b5e95b48SJohn Johansen { 83539d84824SJohn Johansen int error; 83639d84824SJohn Johansen 837ca4bd5aeSJohn Johansen if (!apparmor_enabled) 838ca4bd5aeSJohn Johansen return -EINVAL; 83939d84824SJohn Johansen /* file is ro but enforce 2nd line check */ 84039d84824SJohn Johansen if (apparmor_initialized) 841545de8feSJohn Johansen return -EPERM; 84239d84824SJohn Johansen 84339d84824SJohn Johansen error = param_set_uint(val, kp); 84439d84824SJohn Johansen pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); 84539d84824SJohn Johansen 84639d84824SJohn Johansen return error; 847b5e95b48SJohn Johansen } 848b5e95b48SJohn Johansen 849101d6c82SStephen Rothwell static int param_get_aauint(char *buffer, const struct kernel_param *kp) 850b5e95b48SJohn Johansen { 851ca4bd5aeSJohn Johansen if (!apparmor_enabled) 852ca4bd5aeSJohn Johansen return -EINVAL; 853545de8feSJohn Johansen if (apparmor_initialized && !policy_view_capable(NULL)) 854545de8feSJohn Johansen return -EPERM; 855b5e95b48SJohn Johansen return param_get_uint(buffer, kp); 856b5e95b48SJohn Johansen } 857b5e95b48SJohn Johansen 858b5e95b48SJohn Johansen static int param_get_audit(char *buffer, struct kernel_param *kp) 859b5e95b48SJohn Johansen { 860b5e95b48SJohn Johansen if (!apparmor_enabled) 861b5e95b48SJohn Johansen return -EINVAL; 862545de8feSJohn Johansen if (apparmor_initialized && !policy_view_capable(NULL)) 863545de8feSJohn Johansen return -EPERM; 864b5e95b48SJohn Johansen return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); 865b5e95b48SJohn Johansen } 866b5e95b48SJohn Johansen 867b5e95b48SJohn Johansen static int param_set_audit(const char *val, struct kernel_param *kp) 868b5e95b48SJohn Johansen { 869b5e95b48SJohn Johansen int i; 870b5e95b48SJohn Johansen 871b5e95b48SJohn Johansen if (!apparmor_enabled) 872b5e95b48SJohn Johansen return -EINVAL; 873b5e95b48SJohn Johansen if (!val) 874b5e95b48SJohn Johansen return -EINVAL; 875545de8feSJohn Johansen if (apparmor_initialized && !policy_admin_capable(NULL)) 876545de8feSJohn Johansen return -EPERM; 877b5e95b48SJohn Johansen 878b5e95b48SJohn Johansen for (i = 0; i < AUDIT_MAX_INDEX; i++) { 879b5e95b48SJohn Johansen if (strcmp(val, audit_mode_names[i]) == 0) { 880b5e95b48SJohn Johansen aa_g_audit = i; 881b5e95b48SJohn Johansen return 0; 882b5e95b48SJohn Johansen } 883b5e95b48SJohn Johansen } 884b5e95b48SJohn Johansen 885b5e95b48SJohn Johansen return -EINVAL; 886b5e95b48SJohn Johansen } 887b5e95b48SJohn Johansen 888b5e95b48SJohn Johansen static int param_get_mode(char *buffer, struct kernel_param *kp) 889b5e95b48SJohn Johansen { 890b5e95b48SJohn Johansen if (!apparmor_enabled) 891b5e95b48SJohn Johansen return -EINVAL; 892545de8feSJohn Johansen if (apparmor_initialized && !policy_view_capable(NULL)) 893545de8feSJohn Johansen return -EPERM; 894b5e95b48SJohn Johansen 8950d259f04SJohn Johansen return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); 896b5e95b48SJohn Johansen } 897b5e95b48SJohn Johansen 898b5e95b48SJohn Johansen static int param_set_mode(const char *val, struct kernel_param *kp) 899b5e95b48SJohn Johansen { 900b5e95b48SJohn Johansen int i; 901b5e95b48SJohn Johansen 902b5e95b48SJohn Johansen if (!apparmor_enabled) 903b5e95b48SJohn Johansen return -EINVAL; 904b5e95b48SJohn Johansen if (!val) 905b5e95b48SJohn Johansen return -EINVAL; 906545de8feSJohn Johansen if (apparmor_initialized && !policy_admin_capable(NULL)) 907545de8feSJohn Johansen return -EPERM; 908b5e95b48SJohn Johansen 9090d259f04SJohn Johansen for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { 9100d259f04SJohn Johansen if (strcmp(val, aa_profile_mode_names[i]) == 0) { 911b5e95b48SJohn Johansen aa_g_profile_mode = i; 912b5e95b48SJohn Johansen return 0; 913b5e95b48SJohn Johansen } 914b5e95b48SJohn Johansen } 915b5e95b48SJohn Johansen 916b5e95b48SJohn Johansen return -EINVAL; 917b5e95b48SJohn Johansen } 918b5e95b48SJohn Johansen 919b5e95b48SJohn Johansen /* 920b5e95b48SJohn Johansen * AppArmor init functions 921b5e95b48SJohn Johansen */ 922b5e95b48SJohn Johansen 923b5e95b48SJohn Johansen /** 92455a26ebfSJohn Johansen * set_init_ctx - set a task context and profile on the first task. 925b5e95b48SJohn Johansen * 926b5e95b48SJohn Johansen * TODO: allow setting an alternate profile than unconfined 927b5e95b48SJohn Johansen */ 92855a26ebfSJohn Johansen static int __init set_init_ctx(void) 929b5e95b48SJohn Johansen { 930b5e95b48SJohn Johansen struct cred *cred = (struct cred *)current->real_cred; 93155a26ebfSJohn Johansen struct aa_task_ctx *ctx; 932b5e95b48SJohn Johansen 93355a26ebfSJohn Johansen ctx = aa_alloc_task_context(GFP_KERNEL); 93455a26ebfSJohn Johansen if (!ctx) 935b5e95b48SJohn Johansen return -ENOMEM; 936b5e95b48SJohn Johansen 937*637f688dSJohn Johansen ctx->label = aa_get_label(ns_unconfined(root_ns)); 93855a26ebfSJohn Johansen cred_ctx(cred) = ctx; 939b5e95b48SJohn Johansen 940b5e95b48SJohn Johansen return 0; 941b5e95b48SJohn Johansen } 942b5e95b48SJohn Johansen 943d4669f0bSJohn Johansen static void destroy_buffers(void) 944d4669f0bSJohn Johansen { 945d4669f0bSJohn Johansen u32 i, j; 946d4669f0bSJohn Johansen 947d4669f0bSJohn Johansen for_each_possible_cpu(i) { 948d4669f0bSJohn Johansen for_each_cpu_buffer(j) { 949d4669f0bSJohn Johansen kfree(per_cpu(aa_buffers, i).buf[j]); 950d4669f0bSJohn Johansen per_cpu(aa_buffers, i).buf[j] = NULL; 951d4669f0bSJohn Johansen } 952d4669f0bSJohn Johansen } 953d4669f0bSJohn Johansen } 954d4669f0bSJohn Johansen 955d4669f0bSJohn Johansen static int __init alloc_buffers(void) 956d4669f0bSJohn Johansen { 957d4669f0bSJohn Johansen u32 i, j; 958d4669f0bSJohn Johansen 959d4669f0bSJohn Johansen for_each_possible_cpu(i) { 960d4669f0bSJohn Johansen for_each_cpu_buffer(j) { 961d4669f0bSJohn Johansen char *buffer; 962d4669f0bSJohn Johansen 963d4669f0bSJohn Johansen if (cpu_to_node(i) > num_online_nodes()) 964d4669f0bSJohn Johansen /* fallback to kmalloc for offline nodes */ 965d4669f0bSJohn Johansen buffer = kmalloc(aa_g_path_max, GFP_KERNEL); 966d4669f0bSJohn Johansen else 967d4669f0bSJohn Johansen buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, 968d4669f0bSJohn Johansen cpu_to_node(i)); 969d4669f0bSJohn Johansen if (!buffer) { 970d4669f0bSJohn Johansen destroy_buffers(); 971d4669f0bSJohn Johansen return -ENOMEM; 972d4669f0bSJohn Johansen } 973d4669f0bSJohn Johansen per_cpu(aa_buffers, i).buf[j] = buffer; 974d4669f0bSJohn Johansen } 975d4669f0bSJohn Johansen } 976d4669f0bSJohn Johansen 977d4669f0bSJohn Johansen return 0; 978d4669f0bSJohn Johansen } 979d4669f0bSJohn Johansen 980e3ea1ca5STyler Hicks #ifdef CONFIG_SYSCTL 981e3ea1ca5STyler Hicks static int apparmor_dointvec(struct ctl_table *table, int write, 982e3ea1ca5STyler Hicks void __user *buffer, size_t *lenp, loff_t *ppos) 983e3ea1ca5STyler Hicks { 984e3ea1ca5STyler Hicks if (!policy_admin_capable(NULL)) 985e3ea1ca5STyler Hicks return -EPERM; 986e3ea1ca5STyler Hicks if (!apparmor_enabled) 987e3ea1ca5STyler Hicks return -EINVAL; 988e3ea1ca5STyler Hicks 989e3ea1ca5STyler Hicks return proc_dointvec(table, write, buffer, lenp, ppos); 990e3ea1ca5STyler Hicks } 991e3ea1ca5STyler Hicks 992e3ea1ca5STyler Hicks static struct ctl_path apparmor_sysctl_path[] = { 993e3ea1ca5STyler Hicks { .procname = "kernel", }, 994e3ea1ca5STyler Hicks { } 995e3ea1ca5STyler Hicks }; 996e3ea1ca5STyler Hicks 997e3ea1ca5STyler Hicks static struct ctl_table apparmor_sysctl_table[] = { 998e3ea1ca5STyler Hicks { 999e3ea1ca5STyler Hicks .procname = "unprivileged_userns_apparmor_policy", 1000e3ea1ca5STyler Hicks .data = &unprivileged_userns_apparmor_policy, 1001e3ea1ca5STyler Hicks .maxlen = sizeof(int), 1002e3ea1ca5STyler Hicks .mode = 0600, 1003e3ea1ca5STyler Hicks .proc_handler = apparmor_dointvec, 1004e3ea1ca5STyler Hicks }, 1005e3ea1ca5STyler Hicks { } 1006e3ea1ca5STyler Hicks }; 1007e3ea1ca5STyler Hicks 1008e3ea1ca5STyler Hicks static int __init apparmor_init_sysctl(void) 1009e3ea1ca5STyler Hicks { 1010e3ea1ca5STyler Hicks return register_sysctl_paths(apparmor_sysctl_path, 1011e3ea1ca5STyler Hicks apparmor_sysctl_table) ? 0 : -ENOMEM; 1012e3ea1ca5STyler Hicks } 1013e3ea1ca5STyler Hicks #else 1014e3ea1ca5STyler Hicks static inline int apparmor_init_sysctl(void) 1015e3ea1ca5STyler Hicks { 1016e3ea1ca5STyler Hicks return 0; 1017e3ea1ca5STyler Hicks } 1018e3ea1ca5STyler Hicks #endif /* CONFIG_SYSCTL */ 1019e3ea1ca5STyler Hicks 1020b5e95b48SJohn Johansen static int __init apparmor_init(void) 1021b5e95b48SJohn Johansen { 1022b5e95b48SJohn Johansen int error; 1023b5e95b48SJohn Johansen 1024b1d9e6b0SCasey Schaufler if (!apparmor_enabled || !security_module_enable("apparmor")) { 1025b5e95b48SJohn Johansen aa_info_message("AppArmor disabled by boot time parameter"); 1026b5e95b48SJohn Johansen apparmor_enabled = 0; 1027b5e95b48SJohn Johansen return 0; 1028b5e95b48SJohn Johansen } 1029b5e95b48SJohn Johansen 103011c236b8SJohn Johansen error = aa_setup_dfa_engine(); 103111c236b8SJohn Johansen if (error) { 103211c236b8SJohn Johansen AA_ERROR("Unable to setup dfa engine\n"); 103311c236b8SJohn Johansen goto alloc_out; 103411c236b8SJohn Johansen } 103511c236b8SJohn Johansen 1036b5e95b48SJohn Johansen error = aa_alloc_root_ns(); 1037b5e95b48SJohn Johansen if (error) { 1038b5e95b48SJohn Johansen AA_ERROR("Unable to allocate default profile namespace\n"); 1039b5e95b48SJohn Johansen goto alloc_out; 1040b5e95b48SJohn Johansen } 1041b5e95b48SJohn Johansen 1042e3ea1ca5STyler Hicks error = apparmor_init_sysctl(); 1043e3ea1ca5STyler Hicks if (error) { 1044e3ea1ca5STyler Hicks AA_ERROR("Unable to register sysctls\n"); 1045e3ea1ca5STyler Hicks goto alloc_out; 1046e3ea1ca5STyler Hicks 1047e3ea1ca5STyler Hicks } 1048e3ea1ca5STyler Hicks 1049d4669f0bSJohn Johansen error = alloc_buffers(); 1050d4669f0bSJohn Johansen if (error) { 1051d4669f0bSJohn Johansen AA_ERROR("Unable to allocate work buffers\n"); 1052d4669f0bSJohn Johansen goto buffers_out; 1053d4669f0bSJohn Johansen } 1054d4669f0bSJohn Johansen 105555a26ebfSJohn Johansen error = set_init_ctx(); 1056b5e95b48SJohn Johansen if (error) { 1057b5e95b48SJohn Johansen AA_ERROR("Failed to set context on init task\n"); 1058b1d9e6b0SCasey Schaufler aa_free_root_ns(); 1059d4669f0bSJohn Johansen goto buffers_out; 1060b5e95b48SJohn Johansen } 1061d69dece5SCasey Schaufler security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), 1062d69dece5SCasey Schaufler "apparmor"); 1063b5e95b48SJohn Johansen 1064b5e95b48SJohn Johansen /* Report that AppArmor successfully initialized */ 1065b5e95b48SJohn Johansen apparmor_initialized = 1; 1066b5e95b48SJohn Johansen if (aa_g_profile_mode == APPARMOR_COMPLAIN) 1067b5e95b48SJohn Johansen aa_info_message("AppArmor initialized: complain mode enabled"); 1068b5e95b48SJohn Johansen else if (aa_g_profile_mode == APPARMOR_KILL) 1069b5e95b48SJohn Johansen aa_info_message("AppArmor initialized: kill mode enabled"); 1070b5e95b48SJohn Johansen else 1071b5e95b48SJohn Johansen aa_info_message("AppArmor initialized"); 1072b5e95b48SJohn Johansen 1073b5e95b48SJohn Johansen return error; 1074b5e95b48SJohn Johansen 1075d4669f0bSJohn Johansen buffers_out: 1076d4669f0bSJohn Johansen destroy_buffers(); 1077d4669f0bSJohn Johansen 1078b5e95b48SJohn Johansen alloc_out: 1079b5e95b48SJohn Johansen aa_destroy_aafs(); 108011c236b8SJohn Johansen aa_teardown_dfa_engine(); 1081b5e95b48SJohn Johansen 1082b5e95b48SJohn Johansen apparmor_enabled = 0; 1083b5e95b48SJohn Johansen return error; 1084b5e95b48SJohn Johansen } 1085b5e95b48SJohn Johansen 1086b5e95b48SJohn Johansen security_initcall(apparmor_init); 1087