| /* |
| * 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(current, 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 = { dentry->d_inode->i_uid, |
| dentry->d_inode->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 = dentry->d_inode; |
| struct path_cond cond = { }; |
| |
| if (!inode || !dir->mnt || !mediated_filesystem(inode)) |
| 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->d_inode)) |
| 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 = { path->dentry->d_inode->i_uid, |
| path->dentry->d_inode->i_mode |
| }; |
| |
| if (!path->mnt || !mediated_filesystem(path->dentry->d_inode)) |
| 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->d_inode)) |
| 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->d_inode)) |
| 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 = { old_dentry->d_inode->i_uid, |
| old_dentry->d_inode->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->d_inode)) |
| 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 = { path->dentry->d_inode->i_uid, |
| path->dentry->d_inode->i_mode |
| }; |
| |
| if (!mediated_filesystem(path->dentry->d_inode)) |
| return 0; |
| |
| return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond); |
| } |
| |
| static int apparmor_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
| { |
| if (!mediated_filesystem(dentry->d_inode)) |
| return 0; |
| |
| return common_perm_mnt_dentry(OP_GETATTR, mnt, 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_inode(file))) |
| 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_inode(file))) |
| 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); |
| |
| if (strcmp(name, "current") == 0) |
| error = aa_getprocattr(aa_newest_version(cxt->profile), |
| value); |
| else if (strcmp(name, "prev") == 0 && cxt->previous) |
| error = aa_getprocattr(aa_newest_version(cxt->previous), |
| value); |
| else if (strcmp(name, "exec") == 0 && cxt->onexec) |
| error = aa_getprocattr(aa_newest_version(cxt->onexec), |
| value); |
| else |
| error = -EINVAL; |
| |
| 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_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_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, aabool, S_IRUSR); |
| |
| static int __init apparmor_enabled_setup(char *str) |
| { |
| unsigned long enabled; |
| int error = strict_strtoul(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", 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_NAMES_MAX_INDEX; i++) { |
| if (strcmp(val, 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); |