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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/security/apparmor/lsm.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/security/apparmor/lsm.c')
-rw-r--r--kernel/security/apparmor/lsm.c949
1 files changed, 949 insertions, 0 deletions
diff --git a/kernel/security/apparmor/lsm.c b/kernel/security/apparmor/lsm.c
new file mode 100644
index 000000000..e5f156143
--- /dev/null
+++ b/kernel/security/apparmor/lsm.c
@@ -0,0 +1,949 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor LSM hooks.
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#include <linux/security.h>
+#include <linux/moduleparam.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/ptrace.h>
+#include <linux/ctype.h>
+#include <linux/sysctl.h>
+#include <linux/audit.h>
+#include <linux/user_namespace.h>
+#include <net/sock.h>
+
+#include "include/apparmor.h"
+#include "include/apparmorfs.h"
+#include "include/audit.h"
+#include "include/capability.h"
+#include "include/context.h"
+#include "include/file.h"
+#include "include/ipc.h"
+#include "include/path.h"
+#include "include/policy.h"
+#include "include/procattr.h"
+
+/* Flag indicating whether initialization completed */
+int apparmor_initialized __initdata;
+
+/*
+ * LSM hook functions
+ */
+
+/*
+ * free the associated aa_task_cxt and put its profiles
+ */
+static void apparmor_cred_free(struct cred *cred)
+{
+ aa_free_task_context(cred_cxt(cred));
+ cred_cxt(cred) = NULL;
+}
+
+/*
+ * allocate the apparmor part of blank credentials
+ */
+static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
+{
+ /* freed by apparmor_cred_free */
+ struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
+ if (!cxt)
+ return -ENOMEM;
+
+ cred_cxt(cred) = cxt;
+ return 0;
+}
+
+/*
+ * prepare new aa_task_cxt for modification by prepare_cred block
+ */
+static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ /* freed by apparmor_cred_free */
+ struct aa_task_cxt *cxt = aa_alloc_task_context(gfp);
+ if (!cxt)
+ return -ENOMEM;
+
+ aa_dup_task_context(cxt, cred_cxt(old));
+ cred_cxt(new) = cxt;
+ return 0;
+}
+
+/*
+ * transfer the apparmor data to a blank set of creds
+ */
+static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
+{
+ const struct aa_task_cxt *old_cxt = cred_cxt(old);
+ struct aa_task_cxt *new_cxt = cred_cxt(new);
+
+ aa_dup_task_context(new_cxt, old_cxt);
+}
+
+static int apparmor_ptrace_access_check(struct task_struct *child,
+ unsigned int mode)
+{
+ int error = cap_ptrace_access_check(child, mode);
+ if (error)
+ return error;
+
+ return aa_ptrace(current, child, mode);
+}
+
+static int apparmor_ptrace_traceme(struct task_struct *parent)
+{
+ int error = cap_ptrace_traceme(parent);
+ if (error)
+ return error;
+
+ return aa_ptrace(parent, current, PTRACE_MODE_ATTACH);
+}
+
+/* Derived from security/commoncap.c:cap_capget */
+static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
+ kernel_cap_t *inheritable, kernel_cap_t *permitted)
+{
+ struct aa_profile *profile;
+ const struct cred *cred;
+
+ rcu_read_lock();
+ cred = __task_cred(target);
+ profile = aa_cred_profile(cred);
+
+ *effective = cred->cap_effective;
+ *inheritable = cred->cap_inheritable;
+ *permitted = cred->cap_permitted;
+
+ if (!unconfined(profile) && !COMPLAIN_MODE(profile)) {
+ *effective = cap_intersect(*effective, profile->caps.allow);
+ *permitted = cap_intersect(*permitted, profile->caps.allow);
+ }
+ rcu_read_unlock();
+
+ return 0;
+}
+
+static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
+ int cap, int audit)
+{
+ struct aa_profile *profile;
+ /* cap_capable returns 0 on success, else -EPERM */
+ int error = cap_capable(cred, ns, cap, audit);
+ if (!error) {
+ profile = aa_cred_profile(cred);
+ if (!unconfined(profile))
+ error = aa_capable(profile, cap, audit);
+ }
+ return error;
+}
+
+/**
+ * common_perm - basic common permission check wrapper fn for paths
+ * @op: operation being checked
+ * @path: path to check permission of (NOT NULL)
+ * @mask: requested permissions mask
+ * @cond: conditional info for the permission request (NOT NULL)
+ *
+ * Returns: %0 else error code if error or permission denied
+ */
+static int common_perm(int op, struct path *path, u32 mask,
+ struct path_cond *cond)
+{
+ struct aa_profile *profile;
+ int error = 0;
+
+ profile = __aa_current_profile();
+ if (!unconfined(profile))
+ error = aa_path_perm(op, profile, path, 0, mask, cond);
+
+ return error;
+}
+
+/**
+ * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
+ * @op: operation being checked
+ * @dir: directory of the dentry (NOT NULL)
+ * @dentry: dentry to check (NOT NULL)
+ * @mask: requested permissions mask
+ * @cond: conditional info for the permission request (NOT NULL)
+ *
+ * Returns: %0 else error code if error or permission denied
+ */
+static int common_perm_dir_dentry(int op, struct path *dir,
+ struct dentry *dentry, u32 mask,
+ struct path_cond *cond)
+{
+ struct path path = { dir->mnt, dentry };
+
+ return common_perm(op, &path, mask, cond);
+}
+
+/**
+ * common_perm_mnt_dentry - common permission wrapper when mnt, dentry
+ * @op: operation being checked
+ * @mnt: mount point of dentry (NOT NULL)
+ * @dentry: dentry to check (NOT NULL)
+ * @mask: requested permissions mask
+ *
+ * Returns: %0 else error code if error or permission denied
+ */
+static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
+ struct dentry *dentry, u32 mask)
+{
+ struct path path = { mnt, dentry };
+ struct path_cond cond = { d_backing_inode(dentry)->i_uid,
+ d_backing_inode(dentry)->i_mode
+ };
+
+ return common_perm(op, &path, mask, &cond);
+}
+
+/**
+ * common_perm_rm - common permission wrapper for operations doing rm
+ * @op: operation being checked
+ * @dir: directory that the dentry is in (NOT NULL)
+ * @dentry: dentry being rm'd (NOT NULL)
+ * @mask: requested permission mask
+ *
+ * Returns: %0 else error code if error or permission denied
+ */
+static int common_perm_rm(int op, struct path *dir,
+ struct dentry *dentry, u32 mask)
+{
+ struct inode *inode = d_backing_inode(dentry);
+ struct path_cond cond = { };
+
+ if (!inode || !dir->mnt || !mediated_filesystem(dentry))
+ return 0;
+
+ cond.uid = inode->i_uid;
+ cond.mode = inode->i_mode;
+
+ return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
+}
+
+/**
+ * common_perm_create - common permission wrapper for operations doing create
+ * @op: operation being checked
+ * @dir: directory that dentry will be created in (NOT NULL)
+ * @dentry: dentry to create (NOT NULL)
+ * @mask: request permission mask
+ * @mode: created file mode
+ *
+ * Returns: %0 else error code if error or permission denied
+ */
+static int common_perm_create(int op, struct path *dir, struct dentry *dentry,
+ u32 mask, umode_t mode)
+{
+ struct path_cond cond = { current_fsuid(), mode };
+
+ if (!dir->mnt || !mediated_filesystem(dir->dentry))
+ return 0;
+
+ return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
+}
+
+static int apparmor_path_unlink(struct path *dir, struct dentry *dentry)
+{
+ return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
+}
+
+static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry,
+ umode_t mode)
+{
+ return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
+ S_IFDIR);
+}
+
+static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry)
+{
+ return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
+}
+
+static int apparmor_path_mknod(struct path *dir, struct dentry *dentry,
+ umode_t mode, unsigned int dev)
+{
+ return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
+}
+
+static int apparmor_path_truncate(struct path *path)
+{
+ struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
+ d_backing_inode(path->dentry)->i_mode
+ };
+
+ if (!path->mnt || !mediated_filesystem(path->dentry))
+ return 0;
+
+ return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE,
+ &cond);
+}
+
+static int apparmor_path_symlink(struct path *dir, struct dentry *dentry,
+ const char *old_name)
+{
+ return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
+ S_IFLNK);
+}
+
+static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ struct aa_profile *profile;
+ int error = 0;
+
+ if (!mediated_filesystem(old_dentry))
+ return 0;
+
+ profile = aa_current_profile();
+ if (!unconfined(profile))
+ error = aa_path_link(profile, old_dentry, new_dir, new_dentry);
+ return error;
+}
+
+static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry,
+ struct path *new_dir, struct dentry *new_dentry)
+{
+ struct aa_profile *profile;
+ int error = 0;
+
+ if (!mediated_filesystem(old_dentry))
+ return 0;
+
+ profile = aa_current_profile();
+ if (!unconfined(profile)) {
+ struct path old_path = { old_dir->mnt, old_dentry };
+ struct path new_path = { new_dir->mnt, new_dentry };
+ struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
+ d_backing_inode(old_dentry)->i_mode
+ };
+
+ error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0,
+ MAY_READ | AA_MAY_META_READ | MAY_WRITE |
+ AA_MAY_META_WRITE | AA_MAY_DELETE,
+ &cond);
+ if (!error)
+ error = aa_path_perm(OP_RENAME_DEST, profile, &new_path,
+ 0, MAY_WRITE | AA_MAY_META_WRITE |
+ AA_MAY_CREATE, &cond);
+
+ }
+ return error;
+}
+
+static int apparmor_path_chmod(struct path *path, umode_t mode)
+{
+ if (!mediated_filesystem(path->dentry))
+ return 0;
+
+ return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD);
+}
+
+static int apparmor_path_chown(struct path *path, kuid_t uid, kgid_t gid)
+{
+ struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
+ d_backing_inode(path->dentry)->i_mode
+ };
+
+ if (!mediated_filesystem(path->dentry))
+ return 0;
+
+ return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond);
+}
+
+static int apparmor_inode_getattr(const struct path *path)
+{
+ if (!mediated_filesystem(path->dentry))
+ return 0;
+
+ return common_perm_mnt_dentry(OP_GETATTR, path->mnt, path->dentry,
+ AA_MAY_META_READ);
+}
+
+static int apparmor_file_open(struct file *file, const struct cred *cred)
+{
+ struct aa_file_cxt *fcxt = file->f_security;
+ struct aa_profile *profile;
+ int error = 0;
+
+ if (!mediated_filesystem(file->f_path.dentry))
+ return 0;
+
+ /* If in exec, permission is handled by bprm hooks.
+ * Cache permissions granted by the previous exec check, with
+ * implicit read and executable mmap which are required to
+ * actually execute the image.
+ */
+ if (current->in_execve) {
+ fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
+ return 0;
+ }
+
+ profile = aa_cred_profile(cred);
+ if (!unconfined(profile)) {
+ struct inode *inode = file_inode(file);
+ struct path_cond cond = { inode->i_uid, inode->i_mode };
+
+ error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0,
+ aa_map_file_to_perms(file), &cond);
+ /* todo cache full allowed permissions set and state */
+ fcxt->allow = aa_map_file_to_perms(file);
+ }
+
+ return error;
+}
+
+static int apparmor_file_alloc_security(struct file *file)
+{
+ /* freed by apparmor_file_free_security */
+ file->f_security = aa_alloc_file_context(GFP_KERNEL);
+ if (!file->f_security)
+ return -ENOMEM;
+ return 0;
+
+}
+
+static void apparmor_file_free_security(struct file *file)
+{
+ struct aa_file_cxt *cxt = file->f_security;
+
+ aa_free_file_context(cxt);
+}
+
+static int common_file_perm(int op, struct file *file, u32 mask)
+{
+ struct aa_file_cxt *fcxt = file->f_security;
+ struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred);
+ int error = 0;
+
+ BUG_ON(!fprofile);
+
+ if (!file->f_path.mnt ||
+ !mediated_filesystem(file->f_path.dentry))
+ return 0;
+
+ profile = __aa_current_profile();
+
+ /* revalidate access, if task is unconfined, or the cached cred
+ * doesn't match or if the request is for more permissions than
+ * was granted.
+ *
+ * Note: the test for !unconfined(fprofile) is to handle file
+ * delegation from unconfined tasks
+ */
+ if (!unconfined(profile) && !unconfined(fprofile) &&
+ ((fprofile != profile) || (mask & ~fcxt->allow)))
+ error = aa_file_perm(op, profile, file, mask);
+
+ return error;
+}
+
+static int apparmor_file_permission(struct file *file, int mask)
+{
+ return common_file_perm(OP_FPERM, file, mask);
+}
+
+static int apparmor_file_lock(struct file *file, unsigned int cmd)
+{
+ u32 mask = AA_MAY_LOCK;
+
+ if (cmd == F_WRLCK)
+ mask |= MAY_WRITE;
+
+ return common_file_perm(OP_FLOCK, file, mask);
+}
+
+static int common_mmap(int op, struct file *file, unsigned long prot,
+ unsigned long flags)
+{
+ int mask = 0;
+
+ if (!file || !file->f_security)
+ return 0;
+
+ if (prot & PROT_READ)
+ mask |= MAY_READ;
+ /*
+ * Private mappings don't require write perms since they don't
+ * write back to the files
+ */
+ if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
+ mask |= MAY_WRITE;
+ if (prot & PROT_EXEC)
+ mask |= AA_EXEC_MMAP;
+
+ return common_file_perm(op, file, mask);
+}
+
+static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
+ unsigned long prot, unsigned long flags)
+{
+ return common_mmap(OP_FMMAP, file, prot, flags);
+}
+
+static int apparmor_file_mprotect(struct vm_area_struct *vma,
+ unsigned long reqprot, unsigned long prot)
+{
+ return common_mmap(OP_FMPROT, vma->vm_file, prot,
+ !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
+}
+
+static int apparmor_getprocattr(struct task_struct *task, char *name,
+ char **value)
+{
+ int error = -ENOENT;
+ /* released below */
+ const struct cred *cred = get_task_cred(task);
+ struct aa_task_cxt *cxt = cred_cxt(cred);
+ struct aa_profile *profile = NULL;
+
+ if (strcmp(name, "current") == 0)
+ profile = aa_get_newest_profile(cxt->profile);
+ else if (strcmp(name, "prev") == 0 && cxt->previous)
+ profile = aa_get_newest_profile(cxt->previous);
+ else if (strcmp(name, "exec") == 0 && cxt->onexec)
+ profile = aa_get_newest_profile(cxt->onexec);
+ else
+ error = -EINVAL;
+
+ if (profile)
+ error = aa_getprocattr(profile, value);
+
+ aa_put_profile(profile);
+ put_cred(cred);
+
+ return error;
+}
+
+static int apparmor_setprocattr(struct task_struct *task, char *name,
+ void *value, size_t size)
+{
+ struct common_audit_data sa;
+ struct apparmor_audit_data aad = {0,};
+ char *command, *args = value;
+ size_t arg_size;
+ int error;
+
+ if (size == 0)
+ return -EINVAL;
+ /* args points to a PAGE_SIZE buffer, AppArmor requires that
+ * the buffer must be null terminated or have size <= PAGE_SIZE -1
+ * so that AppArmor can null terminate them
+ */
+ if (args[size - 1] != '\0') {
+ if (size == PAGE_SIZE)
+ return -EINVAL;
+ args[size] = '\0';
+ }
+
+ /* task can only write its own attributes */
+ if (current != task)
+ return -EACCES;
+
+ args = value;
+ args = strim(args);
+ command = strsep(&args, " ");
+ if (!args)
+ return -EINVAL;
+ args = skip_spaces(args);
+ if (!*args)
+ return -EINVAL;
+
+ arg_size = size - (args - (char *) value);
+ if (strcmp(name, "current") == 0) {
+ if (strcmp(command, "changehat") == 0) {
+ error = aa_setprocattr_changehat(args, arg_size,
+ !AA_DO_TEST);
+ } else if (strcmp(command, "permhat") == 0) {
+ error = aa_setprocattr_changehat(args, arg_size,
+ AA_DO_TEST);
+ } else if (strcmp(command, "changeprofile") == 0) {
+ error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
+ !AA_DO_TEST);
+ } else if (strcmp(command, "permprofile") == 0) {
+ error = aa_setprocattr_changeprofile(args, !AA_ONEXEC,
+ AA_DO_TEST);
+ } else
+ goto fail;
+ } else if (strcmp(name, "exec") == 0) {
+ if (strcmp(command, "exec") == 0)
+ error = aa_setprocattr_changeprofile(args, AA_ONEXEC,
+ !AA_DO_TEST);
+ else
+ goto fail;
+ } else
+ /* only support the "current" and "exec" process attributes */
+ return -EINVAL;
+
+ if (!error)
+ error = size;
+ return error;
+
+fail:
+ sa.type = LSM_AUDIT_DATA_NONE;
+ sa.aad = &aad;
+ aad.profile = aa_current_profile();
+ aad.op = OP_SETPROCATTR;
+ aad.info = name;
+ aad.error = -EINVAL;
+ aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
+ return -EINVAL;
+}
+
+static int apparmor_task_setrlimit(struct task_struct *task,
+ unsigned int resource, struct rlimit *new_rlim)
+{
+ struct aa_profile *profile = __aa_current_profile();
+ int error = 0;
+
+ if (!unconfined(profile))
+ error = aa_task_setrlimit(profile, task, resource, new_rlim);
+
+ return error;
+}
+
+static struct security_operations apparmor_ops = {
+ .name = "apparmor",
+
+ .ptrace_access_check = apparmor_ptrace_access_check,
+ .ptrace_traceme = apparmor_ptrace_traceme,
+ .capget = apparmor_capget,
+ .capable = apparmor_capable,
+
+ .path_link = apparmor_path_link,
+ .path_unlink = apparmor_path_unlink,
+ .path_symlink = apparmor_path_symlink,
+ .path_mkdir = apparmor_path_mkdir,
+ .path_rmdir = apparmor_path_rmdir,
+ .path_mknod = apparmor_path_mknod,
+ .path_rename = apparmor_path_rename,
+ .path_chmod = apparmor_path_chmod,
+ .path_chown = apparmor_path_chown,
+ .path_truncate = apparmor_path_truncate,
+ .inode_getattr = apparmor_inode_getattr,
+
+ .file_open = apparmor_file_open,
+ .file_permission = apparmor_file_permission,
+ .file_alloc_security = apparmor_file_alloc_security,
+ .file_free_security = apparmor_file_free_security,
+ .mmap_file = apparmor_mmap_file,
+ .mmap_addr = cap_mmap_addr,
+ .file_mprotect = apparmor_file_mprotect,
+ .file_lock = apparmor_file_lock,
+
+ .getprocattr = apparmor_getprocattr,
+ .setprocattr = apparmor_setprocattr,
+
+ .cred_alloc_blank = apparmor_cred_alloc_blank,
+ .cred_free = apparmor_cred_free,
+ .cred_prepare = apparmor_cred_prepare,
+ .cred_transfer = apparmor_cred_transfer,
+
+ .bprm_set_creds = apparmor_bprm_set_creds,
+ .bprm_committing_creds = apparmor_bprm_committing_creds,
+ .bprm_committed_creds = apparmor_bprm_committed_creds,
+ .bprm_secureexec = apparmor_bprm_secureexec,
+
+ .task_setrlimit = apparmor_task_setrlimit,
+};
+
+/*
+ * AppArmor sysfs module parameters
+ */
+
+static int param_set_aabool(const char *val, const struct kernel_param *kp);
+static int param_get_aabool(char *buffer, const struct kernel_param *kp);
+#define param_check_aabool param_check_bool
+static struct kernel_param_ops param_ops_aabool = {
+ .flags = KERNEL_PARAM_OPS_FL_NOARG,
+ .set = param_set_aabool,
+ .get = param_get_aabool
+};
+
+static int param_set_aauint(const char *val, const struct kernel_param *kp);
+static int param_get_aauint(char *buffer, const struct kernel_param *kp);
+#define param_check_aauint param_check_uint
+static struct kernel_param_ops param_ops_aauint = {
+ .set = param_set_aauint,
+ .get = param_get_aauint
+};
+
+static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
+static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
+#define param_check_aalockpolicy param_check_bool
+static struct kernel_param_ops param_ops_aalockpolicy = {
+ .flags = KERNEL_PARAM_OPS_FL_NOARG,
+ .set = param_set_aalockpolicy,
+ .get = param_get_aalockpolicy
+};
+
+static int param_set_audit(const char *val, struct kernel_param *kp);
+static int param_get_audit(char *buffer, struct kernel_param *kp);
+
+static int param_set_mode(const char *val, struct kernel_param *kp);
+static int param_get_mode(char *buffer, struct kernel_param *kp);
+
+/* Flag values, also controllable via /sys/module/apparmor/parameters
+ * We define special types as we want to do additional mediation.
+ */
+
+/* AppArmor global enforcement switch - complain, enforce, kill */
+enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
+module_param_call(mode, param_set_mode, param_get_mode,
+ &aa_g_profile_mode, S_IRUSR | S_IWUSR);
+
+/* Debug mode */
+bool aa_g_debug;
+module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
+
+/* Audit mode */
+enum audit_mode aa_g_audit;
+module_param_call(audit, param_set_audit, param_get_audit,
+ &aa_g_audit, S_IRUSR | S_IWUSR);
+
+/* Determines if audit header is included in audited messages. This
+ * provides more context if the audit daemon is not running
+ */
+bool aa_g_audit_header = 1;
+module_param_named(audit_header, aa_g_audit_header, aabool,
+ S_IRUSR | S_IWUSR);
+
+/* lock out loading/removal of policy
+ * TODO: add in at boot loading of policy, which is the only way to
+ * load policy, if lock_policy is set
+ */
+bool aa_g_lock_policy;
+module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
+ S_IRUSR | S_IWUSR);
+
+/* Syscall logging mode */
+bool aa_g_logsyscall;
+module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
+
+/* Maximum pathname length before accesses will start getting rejected */
+unsigned int aa_g_path_max = 2 * PATH_MAX;
+module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR);
+
+/* Determines how paranoid loading of policy is and how much verification
+ * on the loaded policy is done.
+ */
+bool aa_g_paranoid_load = 1;
+module_param_named(paranoid_load, aa_g_paranoid_load, aabool,
+ S_IRUSR | S_IWUSR);
+
+/* Boot time disable flag */
+static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
+module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);
+
+static int __init apparmor_enabled_setup(char *str)
+{
+ unsigned long enabled;
+ int error = kstrtoul(str, 0, &enabled);
+ if (!error)
+ apparmor_enabled = enabled ? 1 : 0;
+ return 1;
+}
+
+__setup("apparmor=", apparmor_enabled_setup);
+
+/* set global flag turning off the ability to load policy */
+static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
+{
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+ if (aa_g_lock_policy)
+ return -EACCES;
+ return param_set_bool(val, kp);
+}
+
+static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
+{
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+ return param_get_bool(buffer, kp);
+}
+
+static int param_set_aabool(const char *val, const struct kernel_param *kp)
+{
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+ return param_set_bool(val, kp);
+}
+
+static int param_get_aabool(char *buffer, const struct kernel_param *kp)
+{
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+ return param_get_bool(buffer, kp);
+}
+
+static int param_set_aauint(const char *val, const struct kernel_param *kp)
+{
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+ return param_set_uint(val, kp);
+}
+
+static int param_get_aauint(char *buffer, const struct kernel_param *kp)
+{
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+ return param_get_uint(buffer, kp);
+}
+
+static int param_get_audit(char *buffer, struct kernel_param *kp)
+{
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ if (!apparmor_enabled)
+ return -EINVAL;
+
+ return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
+}
+
+static int param_set_audit(const char *val, struct kernel_param *kp)
+{
+ int i;
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ if (!apparmor_enabled)
+ return -EINVAL;
+
+ if (!val)
+ return -EINVAL;
+
+ for (i = 0; i < AUDIT_MAX_INDEX; i++) {
+ if (strcmp(val, audit_mode_names[i]) == 0) {
+ aa_g_audit = i;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int param_get_mode(char *buffer, struct kernel_param *kp)
+{
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ if (!apparmor_enabled)
+ return -EINVAL;
+
+ return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
+}
+
+static int param_set_mode(const char *val, struct kernel_param *kp)
+{
+ int i;
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ if (!apparmor_enabled)
+ return -EINVAL;
+
+ if (!val)
+ return -EINVAL;
+
+ for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) {
+ if (strcmp(val, aa_profile_mode_names[i]) == 0) {
+ aa_g_profile_mode = i;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * AppArmor init functions
+ */
+
+/**
+ * set_init_cxt - set a task context and profile on the first task.
+ *
+ * TODO: allow setting an alternate profile than unconfined
+ */
+static int __init set_init_cxt(void)
+{
+ struct cred *cred = (struct cred *)current->real_cred;
+ struct aa_task_cxt *cxt;
+
+ cxt = aa_alloc_task_context(GFP_KERNEL);
+ if (!cxt)
+ return -ENOMEM;
+
+ cxt->profile = aa_get_profile(root_ns->unconfined);
+ cred_cxt(cred) = cxt;
+
+ return 0;
+}
+
+static int __init apparmor_init(void)
+{
+ int error;
+
+ if (!apparmor_enabled || !security_module_enable(&apparmor_ops)) {
+ aa_info_message("AppArmor disabled by boot time parameter");
+ apparmor_enabled = 0;
+ return 0;
+ }
+
+ error = aa_alloc_root_ns();
+ if (error) {
+ AA_ERROR("Unable to allocate default profile namespace\n");
+ goto alloc_out;
+ }
+
+ error = set_init_cxt();
+ if (error) {
+ AA_ERROR("Failed to set context on init task\n");
+ goto register_security_out;
+ }
+
+ error = register_security(&apparmor_ops);
+ if (error) {
+ struct cred *cred = (struct cred *)current->real_cred;
+ aa_free_task_context(cred_cxt(cred));
+ cred_cxt(cred) = NULL;
+ AA_ERROR("Unable to register AppArmor\n");
+ goto register_security_out;
+ }
+
+ /* Report that AppArmor successfully initialized */
+ apparmor_initialized = 1;
+ if (aa_g_profile_mode == APPARMOR_COMPLAIN)
+ aa_info_message("AppArmor initialized: complain mode enabled");
+ else if (aa_g_profile_mode == APPARMOR_KILL)
+ aa_info_message("AppArmor initialized: kill mode enabled");
+ else
+ aa_info_message("AppArmor initialized");
+
+ return error;
+
+register_security_out:
+ aa_free_root_ns();
+
+alloc_out:
+ aa_destroy_aafs();
+
+ apparmor_enabled = 0;
+ return error;
+}
+
+security_initcall(apparmor_init);