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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * AppArmor security module
- *
- * This file contains AppArmor LSM hooks.
- *
- * Copyright (C) 1998-2008 Novell/SUSE
- * Copyright 2009-2010 Canonical Ltd.
- */
- #include <linux/lsm_hooks.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 <linux/netfilter_ipv4.h>
- #include <linux/netfilter_ipv6.h>
- #include <linux/zlib.h>
- #include <net/sock.h>
- #include <uapi/linux/mount.h>
- #include "include/apparmor.h"
- #include "include/apparmorfs.h"
- #include "include/audit.h"
- #include "include/capability.h"
- #include "include/cred.h"
- #include "include/file.h"
- #include "include/ipc.h"
- #include "include/net.h"
- #include "include/path.h"
- #include "include/label.h"
- #include "include/policy.h"
- #include "include/policy_ns.h"
- #include "include/procattr.h"
- #include "include/mount.h"
- #include "include/secid.h"
- /* Flag indicating whether initialization completed */
- int apparmor_initialized;
- union aa_buffer {
- struct list_head list;
- char buffer[1];
- };
- #define RESERVE_COUNT 2
- static int reserve_count = RESERVE_COUNT;
- static int buffer_count;
- static LIST_HEAD(aa_global_buffers);
- static DEFINE_SPINLOCK(aa_buffers_lock);
- /*
- * LSM hook functions
- */
- /*
- * put the associated labels
- */
- static void apparmor_cred_free(struct cred *cred)
- {
- aa_put_label(cred_label(cred));
- set_cred_label(cred, NULL);
- }
- /*
- * allocate the apparmor part of blank credentials
- */
- static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
- {
- set_cred_label(cred, NULL);
- return 0;
- }
- /*
- * prepare new cred label for modification by prepare_cred block
- */
- static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
- gfp_t gfp)
- {
- set_cred_label(new, aa_get_newest_label(cred_label(old)));
- return 0;
- }
- /*
- * transfer the apparmor data to a blank set of creds
- */
- static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
- {
- set_cred_label(new, aa_get_newest_label(cred_label(old)));
- }
- static void apparmor_task_free(struct task_struct *task)
- {
- aa_free_task_ctx(task_ctx(task));
- }
- static int apparmor_task_alloc(struct task_struct *task,
- unsigned long clone_flags)
- {
- struct aa_task_ctx *new = task_ctx(task);
- aa_dup_task_ctx(new, task_ctx(current));
- return 0;
- }
- static int apparmor_ptrace_access_check(struct task_struct *child,
- unsigned int mode)
- {
- struct aa_label *tracer, *tracee;
- int error;
- tracer = __begin_current_label_crit_section();
- tracee = aa_get_task_label(child);
- error = aa_may_ptrace(tracer, tracee,
- (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
- : AA_PTRACE_TRACE);
- aa_put_label(tracee);
- __end_current_label_crit_section(tracer);
- return error;
- }
- static int apparmor_ptrace_traceme(struct task_struct *parent)
- {
- struct aa_label *tracer, *tracee;
- int error;
- tracee = __begin_current_label_crit_section();
- tracer = aa_get_task_label(parent);
- error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
- aa_put_label(tracer);
- __end_current_label_crit_section(tracee);
- return error;
- }
- /* 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_label *label;
- const struct cred *cred;
- rcu_read_lock();
- cred = __task_cred(target);
- label = aa_get_newest_cred_label(cred);
- /*
- * cap_capget is stacked ahead of this and will
- * initialize effective and permitted.
- */
- if (!unconfined(label)) {
- struct aa_profile *profile;
- struct label_it i;
- label_for_each_confined(i, label, profile) {
- if (COMPLAIN_MODE(profile))
- continue;
- *effective = cap_intersect(*effective,
- profile->caps.allow);
- *permitted = cap_intersect(*permitted,
- profile->caps.allow);
- }
- }
- rcu_read_unlock();
- aa_put_label(label);
- return 0;
- }
- static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
- int cap, unsigned int opts)
- {
- struct aa_label *label;
- int error = 0;
- label = aa_get_newest_cred_label(cred);
- if (!unconfined(label))
- error = aa_capable(label, cap, opts);
- aa_put_label(label);
- 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(const char *op, const struct path *path, u32 mask,
- struct path_cond *cond)
- {
- struct aa_label *label;
- int error = 0;
- label = __begin_current_label_crit_section();
- if (!unconfined(label))
- error = aa_path_perm(op, label, path, 0, mask, cond);
- __end_current_label_crit_section(label);
- return error;
- }
- /**
- * common_perm_cond - common permission wrapper around inode cond
- * @op: operation being checked
- * @path: location to check (NOT NULL)
- * @mask: requested permissions mask
- *
- * Returns: %0 else error code if error or permission denied
- */
- static int common_perm_cond(const char *op, const struct path *path, u32 mask)
- {
- struct user_namespace *mnt_userns = mnt_user_ns(path->mnt);
- struct path_cond cond = {
- i_uid_into_mnt(mnt_userns, d_backing_inode(path->dentry)),
- d_backing_inode(path->dentry)->i_mode
- };
- if (!path_mediated_fs(path->dentry))
- return 0;
- return common_perm(op, path, mask, &cond);
- }
- /**
- * 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(const char *op, const struct path *dir,
- struct dentry *dentry, u32 mask,
- struct path_cond *cond)
- {
- struct path path = { .mnt = dir->mnt, .dentry = dentry };
- 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(const char *op, const struct path *dir,
- struct dentry *dentry, u32 mask)
- {
- struct inode *inode = d_backing_inode(dentry);
- struct user_namespace *mnt_userns = mnt_user_ns(dir->mnt);
- struct path_cond cond = { };
- if (!inode || !path_mediated_fs(dentry))
- return 0;
- cond.uid = i_uid_into_mnt(mnt_userns, inode);
- 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(const char *op, const struct path *dir,
- struct dentry *dentry, u32 mask, umode_t mode)
- {
- struct path_cond cond = { current_fsuid(), mode };
- if (!path_mediated_fs(dir->dentry))
- return 0;
- return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
- }
- static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
- {
- return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
- }
- static int apparmor_path_mkdir(const 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(const struct path *dir, struct dentry *dentry)
- {
- return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
- }
- static int apparmor_path_mknod(const 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(const struct path *path)
- {
- return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
- }
- static int apparmor_path_symlink(const 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, const struct path *new_dir,
- struct dentry *new_dentry)
- {
- struct aa_label *label;
- int error = 0;
- if (!path_mediated_fs(old_dentry))
- return 0;
- label = begin_current_label_crit_section();
- if (!unconfined(label))
- error = aa_path_link(label, old_dentry, new_dir, new_dentry);
- end_current_label_crit_section(label);
- return error;
- }
- static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
- const struct path *new_dir, struct dentry *new_dentry,
- const unsigned int flags)
- {
- struct aa_label *label;
- int error = 0;
- if (!path_mediated_fs(old_dentry))
- return 0;
- if ((flags & RENAME_EXCHANGE) && !path_mediated_fs(new_dentry))
- return 0;
- label = begin_current_label_crit_section();
- if (!unconfined(label)) {
- struct user_namespace *mnt_userns = mnt_user_ns(old_dir->mnt);
- struct path old_path = { .mnt = old_dir->mnt,
- .dentry = old_dentry };
- struct path new_path = { .mnt = new_dir->mnt,
- .dentry = new_dentry };
- struct path_cond cond = {
- i_uid_into_mnt(mnt_userns, d_backing_inode(old_dentry)),
- d_backing_inode(old_dentry)->i_mode
- };
- if (flags & RENAME_EXCHANGE) {
- struct path_cond cond_exchange = {
- i_uid_into_mnt(mnt_userns, d_backing_inode(new_dentry)),
- d_backing_inode(new_dentry)->i_mode
- };
- error = aa_path_perm(OP_RENAME_SRC, label, &new_path, 0,
- MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
- AA_MAY_SETATTR | AA_MAY_DELETE,
- &cond_exchange);
- if (!error)
- error = aa_path_perm(OP_RENAME_DEST, label, &old_path,
- 0, MAY_WRITE | AA_MAY_SETATTR |
- AA_MAY_CREATE, &cond_exchange);
- }
- if (!error)
- error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
- MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
- AA_MAY_SETATTR | AA_MAY_DELETE,
- &cond);
- if (!error)
- error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
- 0, MAY_WRITE | AA_MAY_SETATTR |
- AA_MAY_CREATE, &cond);
- }
- end_current_label_crit_section(label);
- return error;
- }
- static int apparmor_path_chmod(const struct path *path, umode_t mode)
- {
- return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
- }
- static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
- {
- return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
- }
- static int apparmor_inode_getattr(const struct path *path)
- {
- return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
- }
- static int apparmor_file_open(struct file *file)
- {
- struct aa_file_ctx *fctx = file_ctx(file);
- struct aa_label *label;
- int error = 0;
- if (!path_mediated_fs(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) {
- fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
- return 0;
- }
- label = aa_get_newest_cred_label(file->f_cred);
- if (!unconfined(label)) {
- struct user_namespace *mnt_userns = file_mnt_user_ns(file);
- struct inode *inode = file_inode(file);
- struct path_cond cond = {
- i_uid_into_mnt(mnt_userns, inode),
- inode->i_mode
- };
- error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
- aa_map_file_to_perms(file), &cond);
- /* todo cache full allowed permissions set and state */
- fctx->allow = aa_map_file_to_perms(file);
- }
- aa_put_label(label);
- return error;
- }
- static int apparmor_file_alloc_security(struct file *file)
- {
- struct aa_file_ctx *ctx = file_ctx(file);
- struct aa_label *label = begin_current_label_crit_section();
- spin_lock_init(&ctx->lock);
- rcu_assign_pointer(ctx->label, aa_get_label(label));
- end_current_label_crit_section(label);
- return 0;
- }
- static void apparmor_file_free_security(struct file *file)
- {
- struct aa_file_ctx *ctx = file_ctx(file);
- if (ctx)
- aa_put_label(rcu_access_pointer(ctx->label));
- }
- static int common_file_perm(const char *op, struct file *file, u32 mask,
- bool in_atomic)
- {
- struct aa_label *label;
- int error = 0;
- /* don't reaudit files closed during inheritance */
- if (file->f_path.dentry == aa_null.dentry)
- return -EACCES;
- label = __begin_current_label_crit_section();
- error = aa_file_perm(op, label, file, mask, in_atomic);
- __end_current_label_crit_section(label);
- return error;
- }
- static int apparmor_file_receive(struct file *file)
- {
- return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file),
- false);
- }
- static int apparmor_file_permission(struct file *file, int mask)
- {
- return common_file_perm(OP_FPERM, file, mask, false);
- }
- 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, false);
- }
- static int common_mmap(const char *op, struct file *file, unsigned long prot,
- unsigned long flags, bool in_atomic)
- {
- int mask = 0;
- if (!file || !file_ctx(file))
- 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, in_atomic);
- }
- 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, GFP_ATOMIC);
- }
- 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,
- false);
- }
- static int apparmor_sb_mount(const char *dev_name, const struct path *path,
- const char *type, unsigned long flags, void *data)
- {
- struct aa_label *label;
- int error = 0;
- /* Discard magic */
- if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
- flags &= ~MS_MGC_MSK;
- flags &= ~AA_MS_IGNORE_MASK;
- label = __begin_current_label_crit_section();
- if (!unconfined(label)) {
- if (flags & MS_REMOUNT)
- error = aa_remount(label, path, flags, data);
- else if (flags & MS_BIND)
- error = aa_bind_mount(label, path, dev_name, flags);
- else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
- MS_UNBINDABLE))
- error = aa_mount_change_type(label, path, flags);
- else if (flags & MS_MOVE)
- error = aa_move_mount(label, path, dev_name);
- else
- error = aa_new_mount(label, dev_name, path, type,
- flags, data);
- }
- __end_current_label_crit_section(label);
- return error;
- }
- static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
- {
- struct aa_label *label;
- int error = 0;
- label = __begin_current_label_crit_section();
- if (!unconfined(label))
- error = aa_umount(label, mnt, flags);
- __end_current_label_crit_section(label);
- return error;
- }
- static int apparmor_sb_pivotroot(const struct path *old_path,
- const struct path *new_path)
- {
- struct aa_label *label;
- int error = 0;
- label = aa_get_current_label();
- if (!unconfined(label))
- error = aa_pivotroot(label, old_path, new_path);
- aa_put_label(label);
- return error;
- }
- static int apparmor_getprocattr(struct task_struct *task, const char *name,
- char **value)
- {
- int error = -ENOENT;
- /* released below */
- const struct cred *cred = get_task_cred(task);
- struct aa_task_ctx *ctx = task_ctx(current);
- struct aa_label *label = NULL;
- if (strcmp(name, "current") == 0)
- label = aa_get_newest_label(cred_label(cred));
- else if (strcmp(name, "prev") == 0 && ctx->previous)
- label = aa_get_newest_label(ctx->previous);
- else if (strcmp(name, "exec") == 0 && ctx->onexec)
- label = aa_get_newest_label(ctx->onexec);
- else
- error = -EINVAL;
- if (label)
- error = aa_getprocattr(label, value);
- aa_put_label(label);
- put_cred(cred);
- return error;
- }
- static int apparmor_setprocattr(const char *name, void *value,
- size_t size)
- {
- char *command, *largs = NULL, *args = value;
- size_t arg_size;
- int error;
- DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
- if (size == 0)
- return -EINVAL;
- /* AppArmor requires that the buffer must be null terminated atm */
- if (args[size - 1] != '\0') {
- /* null terminate */
- largs = args = kmalloc(size + 1, GFP_KERNEL);
- if (!args)
- return -ENOMEM;
- memcpy(args, value, size);
- args[size] = '\0';
- }
- error = -EINVAL;
- args = strim(args);
- command = strsep(&args, " ");
- if (!args)
- goto out;
- args = skip_spaces(args);
- if (!*args)
- goto out;
- arg_size = size - (args - (largs ? largs : (char *) value));
- if (strcmp(name, "current") == 0) {
- if (strcmp(command, "changehat") == 0) {
- error = aa_setprocattr_changehat(args, arg_size,
- AA_CHANGE_NOFLAGS);
- } else if (strcmp(command, "permhat") == 0) {
- error = aa_setprocattr_changehat(args, arg_size,
- AA_CHANGE_TEST);
- } else if (strcmp(command, "changeprofile") == 0) {
- error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
- } else if (strcmp(command, "permprofile") == 0) {
- error = aa_change_profile(args, AA_CHANGE_TEST);
- } else if (strcmp(command, "stack") == 0) {
- error = aa_change_profile(args, AA_CHANGE_STACK);
- } else
- goto fail;
- } else if (strcmp(name, "exec") == 0) {
- if (strcmp(command, "exec") == 0)
- error = aa_change_profile(args, AA_CHANGE_ONEXEC);
- else if (strcmp(command, "stack") == 0)
- error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
- AA_CHANGE_STACK));
- else
- goto fail;
- } else
- /* only support the "current" and "exec" process attributes */
- goto fail;
- if (!error)
- error = size;
- out:
- kfree(largs);
- return error;
- fail:
- aad(&sa)->label = begin_current_label_crit_section();
- aad(&sa)->info = name;
- aad(&sa)->error = error = -EINVAL;
- aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
- end_current_label_crit_section(aad(&sa)->label);
- goto out;
- }
- /**
- * apparmor_bprm_committing_creds - do task cleanup on committing new creds
- * @bprm: binprm for the exec (NOT NULL)
- */
- static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
- {
- struct aa_label *label = aa_current_raw_label();
- struct aa_label *new_label = cred_label(bprm->cred);
- /* bail out if unconfined or not changing profile */
- if ((new_label->proxy == label->proxy) ||
- (unconfined(new_label)))
- return;
- aa_inherit_files(bprm->cred, current->files);
- current->pdeath_signal = 0;
- /* reset soft limits and set hard limits for the new label */
- __aa_transition_rlimits(label, new_label);
- }
- /**
- * apparmor_bprm_committed_cred - do cleanup after new creds committed
- * @bprm: binprm for the exec (NOT NULL)
- */
- static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
- {
- /* clear out temporary/transitional state from the context */
- aa_clear_task_ctx_trans(task_ctx(current));
- return;
- }
- static void apparmor_current_getsecid_subj(u32 *secid)
- {
- struct aa_label *label = aa_get_current_label();
- *secid = label->secid;
- aa_put_label(label);
- }
- static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid)
- {
- struct aa_label *label = aa_get_task_label(p);
- *secid = label->secid;
- aa_put_label(label);
- }
- static int apparmor_task_setrlimit(struct task_struct *task,
- unsigned int resource, struct rlimit *new_rlim)
- {
- struct aa_label *label = __begin_current_label_crit_section();
- int error = 0;
- if (!unconfined(label))
- error = aa_task_setrlimit(label, task, resource, new_rlim);
- __end_current_label_crit_section(label);
- return error;
- }
- static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
- int sig, const struct cred *cred)
- {
- struct aa_label *cl, *tl;
- int error;
- if (cred) {
- /*
- * Dealing with USB IO specific behavior
- */
- cl = aa_get_newest_cred_label(cred);
- tl = aa_get_task_label(target);
- error = aa_may_signal(cl, tl, sig);
- aa_put_label(cl);
- aa_put_label(tl);
- return error;
- }
- cl = __begin_current_label_crit_section();
- tl = aa_get_task_label(target);
- error = aa_may_signal(cl, tl, sig);
- aa_put_label(tl);
- __end_current_label_crit_section(cl);
- return error;
- }
- /**
- * apparmor_sk_alloc_security - allocate and attach the sk_security field
- */
- static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
- {
- struct aa_sk_ctx *ctx;
- ctx = kzalloc(sizeof(*ctx), flags);
- if (!ctx)
- return -ENOMEM;
- SK_CTX(sk) = ctx;
- return 0;
- }
- /**
- * apparmor_sk_free_security - free the sk_security field
- */
- static void apparmor_sk_free_security(struct sock *sk)
- {
- struct aa_sk_ctx *ctx = SK_CTX(sk);
- SK_CTX(sk) = NULL;
- aa_put_label(ctx->label);
- aa_put_label(ctx->peer);
- kfree(ctx);
- }
- /**
- * apparmor_sk_clone_security - clone the sk_security field
- */
- static void apparmor_sk_clone_security(const struct sock *sk,
- struct sock *newsk)
- {
- struct aa_sk_ctx *ctx = SK_CTX(sk);
- struct aa_sk_ctx *new = SK_CTX(newsk);
- if (new->label)
- aa_put_label(new->label);
- new->label = aa_get_label(ctx->label);
- if (new->peer)
- aa_put_label(new->peer);
- new->peer = aa_get_label(ctx->peer);
- }
- /**
- * apparmor_socket_create - check perms before creating a new socket
- */
- static int apparmor_socket_create(int family, int type, int protocol, int kern)
- {
- struct aa_label *label;
- int error = 0;
- AA_BUG(in_interrupt());
- label = begin_current_label_crit_section();
- if (!(kern || unconfined(label)))
- error = af_select(family,
- create_perm(label, family, type, protocol),
- aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
- family, type, protocol));
- end_current_label_crit_section(label);
- return error;
- }
- /**
- * apparmor_socket_post_create - setup the per-socket security struct
- *
- * Note:
- * - kernel sockets currently labeled unconfined but we may want to
- * move to a special kernel label
- * - socket may not have sk here if created with sock_create_lite or
- * sock_alloc. These should be accept cases which will be handled in
- * sock_graft.
- */
- static int apparmor_socket_post_create(struct socket *sock, int family,
- int type, int protocol, int kern)
- {
- struct aa_label *label;
- if (kern) {
- label = aa_get_label(kernel_t);
- } else
- label = aa_get_current_label();
- if (sock->sk) {
- struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
- aa_put_label(ctx->label);
- ctx->label = aa_get_label(label);
- }
- aa_put_label(label);
- return 0;
- }
- /**
- * apparmor_socket_bind - check perms before bind addr to socket
- */
- static int apparmor_socket_bind(struct socket *sock,
- struct sockaddr *address, int addrlen)
- {
- AA_BUG(!sock);
- AA_BUG(!sock->sk);
- AA_BUG(!address);
- AA_BUG(in_interrupt());
- return af_select(sock->sk->sk_family,
- bind_perm(sock, address, addrlen),
- aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
- }
- /**
- * apparmor_socket_connect - check perms before connecting @sock to @address
- */
- static int apparmor_socket_connect(struct socket *sock,
- struct sockaddr *address, int addrlen)
- {
- AA_BUG(!sock);
- AA_BUG(!sock->sk);
- AA_BUG(!address);
- AA_BUG(in_interrupt());
- return af_select(sock->sk->sk_family,
- connect_perm(sock, address, addrlen),
- aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
- }
- /**
- * apparmor_socket_listen - check perms before allowing listen
- */
- static int apparmor_socket_listen(struct socket *sock, int backlog)
- {
- AA_BUG(!sock);
- AA_BUG(!sock->sk);
- AA_BUG(in_interrupt());
- return af_select(sock->sk->sk_family,
- listen_perm(sock, backlog),
- aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
- }
- /**
- * apparmor_socket_accept - check perms before accepting a new connection.
- *
- * Note: while @newsock is created and has some information, the accept
- * has not been done.
- */
- static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
- {
- AA_BUG(!sock);
- AA_BUG(!sock->sk);
- AA_BUG(!newsock);
- AA_BUG(in_interrupt());
- return af_select(sock->sk->sk_family,
- accept_perm(sock, newsock),
- aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
- }
- static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
- struct msghdr *msg, int size)
- {
- AA_BUG(!sock);
- AA_BUG(!sock->sk);
- AA_BUG(!msg);
- AA_BUG(in_interrupt());
- return af_select(sock->sk->sk_family,
- msg_perm(op, request, sock, msg, size),
- aa_sk_perm(op, request, sock->sk));
- }
- /**
- * apparmor_socket_sendmsg - check perms before sending msg to another socket
- */
- static int apparmor_socket_sendmsg(struct socket *sock,
- struct msghdr *msg, int size)
- {
- return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
- }
- /**
- * apparmor_socket_recvmsg - check perms before receiving a message
- */
- static int apparmor_socket_recvmsg(struct socket *sock,
- struct msghdr *msg, int size, int flags)
- {
- return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
- }
- /* revaliation, get/set attr, shutdown */
- static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
- {
- AA_BUG(!sock);
- AA_BUG(!sock->sk);
- AA_BUG(in_interrupt());
- return af_select(sock->sk->sk_family,
- sock_perm(op, request, sock),
- aa_sk_perm(op, request, sock->sk));
- }
- /**
- * apparmor_socket_getsockname - check perms before getting the local address
- */
- static int apparmor_socket_getsockname(struct socket *sock)
- {
- return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
- }
- /**
- * apparmor_socket_getpeername - check perms before getting remote address
- */
- static int apparmor_socket_getpeername(struct socket *sock)
- {
- return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
- }
- /* revaliation, get/set attr, opt */
- static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
- int level, int optname)
- {
- AA_BUG(!sock);
- AA_BUG(!sock->sk);
- AA_BUG(in_interrupt());
- return af_select(sock->sk->sk_family,
- opt_perm(op, request, sock, level, optname),
- aa_sk_perm(op, request, sock->sk));
- }
- /**
- * apparmor_socket_getsockopt - check perms before getting socket options
- */
- static int apparmor_socket_getsockopt(struct socket *sock, int level,
- int optname)
- {
- return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
- level, optname);
- }
- /**
- * apparmor_socket_setsockopt - check perms before setting socket options
- */
- static int apparmor_socket_setsockopt(struct socket *sock, int level,
- int optname)
- {
- return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
- level, optname);
- }
- /**
- * apparmor_socket_shutdown - check perms before shutting down @sock conn
- */
- static int apparmor_socket_shutdown(struct socket *sock, int how)
- {
- return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
- }
- #ifdef CONFIG_NETWORK_SECMARK
- /**
- * apparmor_socket_sock_rcv_skb - check perms before associating skb to sk
- *
- * Note: can not sleep may be called with locks held
- *
- * dont want protocol specific in __skb_recv_datagram()
- * to deny an incoming connection socket_sock_rcv_skb()
- */
- static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
- {
- struct aa_sk_ctx *ctx = SK_CTX(sk);
- if (!skb->secmark)
- return 0;
- return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
- skb->secmark, sk);
- }
- #endif
- static struct aa_label *sk_peer_label(struct sock *sk)
- {
- struct aa_sk_ctx *ctx = SK_CTX(sk);
- if (ctx->peer)
- return ctx->peer;
- return ERR_PTR(-ENOPROTOOPT);
- }
- /**
- * apparmor_socket_getpeersec_stream - get security context of peer
- *
- * Note: for tcp only valid if using ipsec or cipso on lan
- */
- static int apparmor_socket_getpeersec_stream(struct socket *sock,
- char __user *optval,
- int __user *optlen,
- unsigned int len)
- {
- char *name;
- int slen, error = 0;
- struct aa_label *label;
- struct aa_label *peer;
- label = begin_current_label_crit_section();
- peer = sk_peer_label(sock->sk);
- if (IS_ERR(peer)) {
- error = PTR_ERR(peer);
- goto done;
- }
- slen = aa_label_asxprint(&name, labels_ns(label), peer,
- FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
- FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
- /* don't include terminating \0 in slen, it breaks some apps */
- if (slen < 0) {
- error = -ENOMEM;
- } else {
- if (slen > len) {
- error = -ERANGE;
- } else if (copy_to_user(optval, name, slen)) {
- error = -EFAULT;
- goto out;
- }
- if (put_user(slen, optlen))
- error = -EFAULT;
- out:
- kfree(name);
- }
- done:
- end_current_label_crit_section(label);
- return error;
- }
- /**
- * apparmor_socket_getpeersec_dgram - get security label of packet
- * @sock: the peer socket
- * @skb: packet data
- * @secid: pointer to where to put the secid of the packet
- *
- * Sets the netlabel socket state on sk from parent
- */
- static int apparmor_socket_getpeersec_dgram(struct socket *sock,
- struct sk_buff *skb, u32 *secid)
- {
- /* TODO: requires secid support */
- return -ENOPROTOOPT;
- }
- /**
- * apparmor_sock_graft - Initialize newly created socket
- * @sk: child sock
- * @parent: parent socket
- *
- * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
- * just set sk security information off of current creating process label
- * Labeling of sk for accept case - probably should be sock based
- * instead of task, because of the case where an implicitly labeled
- * socket is shared by different tasks.
- */
- static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
- {
- struct aa_sk_ctx *ctx = SK_CTX(sk);
- if (!ctx->label)
- ctx->label = aa_get_current_label();
- }
- #ifdef CONFIG_NETWORK_SECMARK
- static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
- struct request_sock *req)
- {
- struct aa_sk_ctx *ctx = SK_CTX(sk);
- if (!skb->secmark)
- return 0;
- return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
- skb->secmark, sk);
- }
- #endif
- /*
- * The cred blob is a pointer to, not an instance of, an aa_label.
- */
- struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
- .lbs_cred = sizeof(struct aa_label *),
- .lbs_file = sizeof(struct aa_file_ctx),
- .lbs_task = sizeof(struct aa_task_ctx),
- };
- static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
- LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
- LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
- LSM_HOOK_INIT(capget, apparmor_capget),
- LSM_HOOK_INIT(capable, apparmor_capable),
- LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
- LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
- LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
- LSM_HOOK_INIT(path_link, apparmor_path_link),
- LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
- LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
- LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
- LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
- LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
- LSM_HOOK_INIT(path_rename, apparmor_path_rename),
- LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
- LSM_HOOK_INIT(path_chown, apparmor_path_chown),
- LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
- LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
- LSM_HOOK_INIT(file_open, apparmor_file_open),
- LSM_HOOK_INIT(file_receive, apparmor_file_receive),
- LSM_HOOK_INIT(file_permission, apparmor_file_permission),
- LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
- LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
- LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
- LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
- LSM_HOOK_INIT(file_lock, apparmor_file_lock),
- LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
- LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
- LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
- LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
- LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
- LSM_HOOK_INIT(socket_create, apparmor_socket_create),
- LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
- LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
- LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
- LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
- LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
- LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
- LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
- LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
- LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
- LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
- LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
- LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
- #ifdef CONFIG_NETWORK_SECMARK
- LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
- #endif
- LSM_HOOK_INIT(socket_getpeersec_stream,
- apparmor_socket_getpeersec_stream),
- LSM_HOOK_INIT(socket_getpeersec_dgram,
- apparmor_socket_getpeersec_dgram),
- LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
- #ifdef CONFIG_NETWORK_SECMARK
- LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
- #endif
- LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
- LSM_HOOK_INIT(cred_free, apparmor_cred_free),
- LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
- LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
- LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec),
- LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
- LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
- LSM_HOOK_INIT(task_free, apparmor_task_free),
- LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
- LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj),
- LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj),
- LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
- LSM_HOOK_INIT(task_kill, apparmor_task_kill),
- #ifdef CONFIG_AUDIT
- LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
- LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
- LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
- LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
- #endif
- LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
- LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
- LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
- };
- /*
- * 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 const 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 const struct kernel_param_ops param_ops_aauint = {
- .set = param_set_aauint,
- .get = param_get_aauint
- };
- static int param_set_aacompressionlevel(const char *val,
- const struct kernel_param *kp);
- static int param_get_aacompressionlevel(char *buffer,
- const struct kernel_param *kp);
- #define param_check_aacompressionlevel param_check_int
- static const struct kernel_param_ops param_ops_aacompressionlevel = {
- .set = param_set_aacompressionlevel,
- .get = param_get_aacompressionlevel
- };
- 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 const 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, const struct kernel_param *kp);
- static int param_get_audit(char *buffer, const struct kernel_param *kp);
- static int param_set_mode(const char *val, const struct kernel_param *kp);
- static int param_get_mode(char *buffer, const 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);
- /* whether policy verification hashing is enabled */
- bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
- #ifdef CONFIG_SECURITY_APPARMOR_HASH
- module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
- #endif
- /* whether policy exactly as loaded is retained for debug and checkpointing */
- bool aa_g_export_binary = IS_ENABLED(CONFIG_SECURITY_APPARMOR_EXPORT_BINARY);
- #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
- module_param_named(export_binary, aa_g_export_binary, aabool, 0600);
- #endif
- /* policy loaddata compression level */
- int aa_g_rawdata_compression_level = Z_DEFAULT_COMPRESSION;
- module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level,
- aacompressionlevel, 0400);
- /* Debug mode */
- bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
- 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 = true;
- 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);
- /* Determines how paranoid loading of policy is and how much verification
- * on the loaded policy is done.
- * DEPRECATED: read only as strict checking of load is always done now
- * that none root users (user namespaces) can load policy.
- */
- bool aa_g_paranoid_load = IS_ENABLED(CONFIG_SECURITY_APPARMOR_PARANOID_LOAD);
- module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
- static int param_get_aaintbool(char *buffer, const struct kernel_param *kp);
- static int param_set_aaintbool(const char *val, const struct kernel_param *kp);
- #define param_check_aaintbool param_check_int
- static const struct kernel_param_ops param_ops_aaintbool = {
- .set = param_set_aaintbool,
- .get = param_get_aaintbool
- };
- /* Boot time disable flag */
- static int apparmor_enabled __lsm_ro_after_init = 1;
- module_param_named(enabled, apparmor_enabled, aaintbool, 0444);
- 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 (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
- return -EPERM;
- return param_set_bool(val, kp);
- }
- static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
- {
- if (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
- return -EPERM;
- return param_get_bool(buffer, kp);
- }
- static int param_set_aabool(const char *val, const struct kernel_param *kp)
- {
- if (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
- return -EPERM;
- return param_set_bool(val, kp);
- }
- static int param_get_aabool(char *buffer, const struct kernel_param *kp)
- {
- if (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
- return -EPERM;
- return param_get_bool(buffer, kp);
- }
- static int param_set_aauint(const char *val, const struct kernel_param *kp)
- {
- int error;
- if (!apparmor_enabled)
- return -EINVAL;
- /* file is ro but enforce 2nd line check */
- if (apparmor_initialized)
- return -EPERM;
- error = param_set_uint(val, kp);
- aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer));
- pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
- return error;
- }
- static int param_get_aauint(char *buffer, const struct kernel_param *kp)
- {
- if (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
- return -EPERM;
- return param_get_uint(buffer, kp);
- }
- /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */
- static int param_set_aaintbool(const char *val, const struct kernel_param *kp)
- {
- struct kernel_param kp_local;
- bool value;
- int error;
- if (apparmor_initialized)
- return -EPERM;
- /* Create local copy, with arg pointing to bool type. */
- value = !!*((int *)kp->arg);
- memcpy(&kp_local, kp, sizeof(kp_local));
- kp_local.arg = &value;
- error = param_set_bool(val, &kp_local);
- if (!error)
- *((int *)kp->arg) = *((bool *)kp_local.arg);
- return error;
- }
- /*
- * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to
- * 1/0, this converts the "int that is actually bool" back to bool for
- * display in the /sys filesystem, while keeping it "int" for the LSM
- * infrastructure.
- */
- static int param_get_aaintbool(char *buffer, const struct kernel_param *kp)
- {
- struct kernel_param kp_local;
- bool value;
- /* Create local copy, with arg pointing to bool type. */
- value = !!*((int *)kp->arg);
- memcpy(&kp_local, kp, sizeof(kp_local));
- kp_local.arg = &value;
- return param_get_bool(buffer, &kp_local);
- }
- static int param_set_aacompressionlevel(const char *val,
- const struct kernel_param *kp)
- {
- int error;
- if (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized)
- return -EPERM;
- error = param_set_int(val, kp);
- aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level,
- Z_NO_COMPRESSION,
- Z_BEST_COMPRESSION);
- pr_info("AppArmor: policy rawdata compression level set to %u\n",
- aa_g_rawdata_compression_level);
- return error;
- }
- static int param_get_aacompressionlevel(char *buffer,
- const struct kernel_param *kp)
- {
- if (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
- return -EPERM;
- return param_get_int(buffer, kp);
- }
- static int param_get_audit(char *buffer, const struct kernel_param *kp)
- {
- if (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
- return -EPERM;
- return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
- }
- static int param_set_audit(const char *val, const struct kernel_param *kp)
- {
- int i;
- if (!apparmor_enabled)
- return -EINVAL;
- if (!val)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
- return -EPERM;
- i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
- if (i < 0)
- return -EINVAL;
- aa_g_audit = i;
- return 0;
- }
- static int param_get_mode(char *buffer, const struct kernel_param *kp)
- {
- if (!apparmor_enabled)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
- return -EPERM;
- return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
- }
- static int param_set_mode(const char *val, const struct kernel_param *kp)
- {
- int i;
- if (!apparmor_enabled)
- return -EINVAL;
- if (!val)
- return -EINVAL;
- if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
- return -EPERM;
- i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
- val);
- if (i < 0)
- return -EINVAL;
- aa_g_profile_mode = i;
- return 0;
- }
- char *aa_get_buffer(bool in_atomic)
- {
- union aa_buffer *aa_buf;
- bool try_again = true;
- gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
- retry:
- spin_lock(&aa_buffers_lock);
- if (buffer_count > reserve_count ||
- (in_atomic && !list_empty(&aa_global_buffers))) {
- aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
- list);
- list_del(&aa_buf->list);
- buffer_count--;
- spin_unlock(&aa_buffers_lock);
- return &aa_buf->buffer[0];
- }
- if (in_atomic) {
- /*
- * out of reserve buffers and in atomic context so increase
- * how many buffers to keep in reserve
- */
- reserve_count++;
- flags = GFP_ATOMIC;
- }
- spin_unlock(&aa_buffers_lock);
- if (!in_atomic)
- might_sleep();
- aa_buf = kmalloc(aa_g_path_max, flags);
- if (!aa_buf) {
- if (try_again) {
- try_again = false;
- goto retry;
- }
- pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
- return NULL;
- }
- return &aa_buf->buffer[0];
- }
- void aa_put_buffer(char *buf)
- {
- union aa_buffer *aa_buf;
- if (!buf)
- return;
- aa_buf = container_of(buf, union aa_buffer, buffer[0]);
- spin_lock(&aa_buffers_lock);
- list_add(&aa_buf->list, &aa_global_buffers);
- buffer_count++;
- spin_unlock(&aa_buffers_lock);
- }
- /*
- * AppArmor init functions
- */
- /**
- * set_init_ctx - set a task context and profile on the first task.
- *
- * TODO: allow setting an alternate profile than unconfined
- */
- static int __init set_init_ctx(void)
- {
- struct cred *cred = (__force struct cred *)current->real_cred;
- set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
- return 0;
- }
- static void destroy_buffers(void)
- {
- union aa_buffer *aa_buf;
- spin_lock(&aa_buffers_lock);
- while (!list_empty(&aa_global_buffers)) {
- aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
- list);
- list_del(&aa_buf->list);
- spin_unlock(&aa_buffers_lock);
- kfree(aa_buf);
- spin_lock(&aa_buffers_lock);
- }
- spin_unlock(&aa_buffers_lock);
- }
- static int __init alloc_buffers(void)
- {
- union aa_buffer *aa_buf;
- int i, num;
- /*
- * A function may require two buffers at once. Usually the buffers are
- * used for a short period of time and are shared. On UP kernel buffers
- * two should be enough, with more CPUs it is possible that more
- * buffers will be used simultaneously. The preallocated pool may grow.
- * This preallocation has also the side-effect that AppArmor will be
- * disabled early at boot if aa_g_path_max is extremly high.
- */
- if (num_online_cpus() > 1)
- num = 4 + RESERVE_COUNT;
- else
- num = 2 + RESERVE_COUNT;
- for (i = 0; i < num; i++) {
- aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL |
- __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
- if (!aa_buf) {
- destroy_buffers();
- return -ENOMEM;
- }
- aa_put_buffer(&aa_buf->buffer[0]);
- }
- return 0;
- }
- #ifdef CONFIG_SYSCTL
- static int apparmor_dointvec(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- if (!aa_current_policy_admin_capable(NULL))
- return -EPERM;
- if (!apparmor_enabled)
- return -EINVAL;
- return proc_dointvec(table, write, buffer, lenp, ppos);
- }
- static struct ctl_path apparmor_sysctl_path[] = {
- { .procname = "kernel", },
- { }
- };
- static struct ctl_table apparmor_sysctl_table[] = {
- {
- .procname = "unprivileged_userns_apparmor_policy",
- .data = &unprivileged_userns_apparmor_policy,
- .maxlen = sizeof(int),
- .mode = 0600,
- .proc_handler = apparmor_dointvec,
- },
- {
- .procname = "apparmor_display_secid_mode",
- .data = &apparmor_display_secid_mode,
- .maxlen = sizeof(int),
- .mode = 0600,
- .proc_handler = apparmor_dointvec,
- },
- { }
- };
- static int __init apparmor_init_sysctl(void)
- {
- return register_sysctl_paths(apparmor_sysctl_path,
- apparmor_sysctl_table) ? 0 : -ENOMEM;
- }
- #else
- static inline int apparmor_init_sysctl(void)
- {
- return 0;
- }
- #endif /* CONFIG_SYSCTL */
- #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
- static unsigned int apparmor_ip_postroute(void *priv,
- struct sk_buff *skb,
- const struct nf_hook_state *state)
- {
- struct aa_sk_ctx *ctx;
- struct sock *sk;
- if (!skb->secmark)
- return NF_ACCEPT;
- sk = skb_to_full_sk(skb);
- if (sk == NULL)
- return NF_ACCEPT;
- ctx = SK_CTX(sk);
- if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
- skb->secmark, sk))
- return NF_ACCEPT;
- return NF_DROP_ERR(-ECONNREFUSED);
- }
- static const struct nf_hook_ops apparmor_nf_ops[] = {
- {
- .hook = apparmor_ip_postroute,
- .pf = NFPROTO_IPV4,
- .hooknum = NF_INET_POST_ROUTING,
- .priority = NF_IP_PRI_SELINUX_FIRST,
- },
- #if IS_ENABLED(CONFIG_IPV6)
- {
- .hook = apparmor_ip_postroute,
- .pf = NFPROTO_IPV6,
- .hooknum = NF_INET_POST_ROUTING,
- .priority = NF_IP6_PRI_SELINUX_FIRST,
- },
- #endif
- };
- static int __net_init apparmor_nf_register(struct net *net)
- {
- return nf_register_net_hooks(net, apparmor_nf_ops,
- ARRAY_SIZE(apparmor_nf_ops));
- }
- static void __net_exit apparmor_nf_unregister(struct net *net)
- {
- nf_unregister_net_hooks(net, apparmor_nf_ops,
- ARRAY_SIZE(apparmor_nf_ops));
- }
- static struct pernet_operations apparmor_net_ops = {
- .init = apparmor_nf_register,
- .exit = apparmor_nf_unregister,
- };
- static int __init apparmor_nf_ip_init(void)
- {
- int err;
- if (!apparmor_enabled)
- return 0;
- err = register_pernet_subsys(&apparmor_net_ops);
- if (err)
- panic("Apparmor: register_pernet_subsys: error %d\n", err);
- return 0;
- }
- __initcall(apparmor_nf_ip_init);
- #endif
- static int __init apparmor_init(void)
- {
- int error;
- error = aa_setup_dfa_engine();
- if (error) {
- AA_ERROR("Unable to setup dfa engine\n");
- goto alloc_out;
- }
- error = aa_alloc_root_ns();
- if (error) {
- AA_ERROR("Unable to allocate default profile namespace\n");
- goto alloc_out;
- }
- error = apparmor_init_sysctl();
- if (error) {
- AA_ERROR("Unable to register sysctls\n");
- goto alloc_out;
- }
- error = alloc_buffers();
- if (error) {
- AA_ERROR("Unable to allocate work buffers\n");
- goto alloc_out;
- }
- error = set_init_ctx();
- if (error) {
- AA_ERROR("Failed to set context on init task\n");
- aa_free_root_ns();
- goto buffers_out;
- }
- security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
- "apparmor");
- /* 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;
- buffers_out:
- destroy_buffers();
- alloc_out:
- aa_destroy_aafs();
- aa_teardown_dfa_engine();
- apparmor_enabled = false;
- return error;
- }
- DEFINE_LSM(apparmor) = {
- .name = "apparmor",
- .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
- .enabled = &apparmor_enabled,
- .blobs = &apparmor_blob_sizes,
- .init = apparmor_init,
- };
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