Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757054AbZKJQN4 (ORCPT ); Tue, 10 Nov 2009 11:13:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756996AbZKJQNx (ORCPT ); Tue, 10 Nov 2009 11:13:53 -0500 Received: from adelie.canonical.com ([91.189.90.139]:60282 "EHLO adelie.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756994AbZKJQNq (ORCPT ); Tue, 10 Nov 2009 11:13:46 -0500 From: John Johansen To: linux-kernel@vger.kernel.org Cc: linux-security-module@vger.kernel.org, John Johansen Subject: [PATCH 11/12] AppArmor: LSM interface, and security module initialization Date: Tue, 10 Nov 2009 08:13:04 -0800 Message-Id: <1257869585-7092-12-git-send-email-john.johansen@canonical.com> X-Mailer: git-send-email 1.6.3.3 In-Reply-To: <1257869585-7092-1-git-send-email-john.johansen@canonical.com> References: <1257869585-7092-1-git-send-email-john.johansen@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 28611 Lines: 1086 AppArmor hooks to interface with the LSM, and module parameters and initialization. Signed-off-by: John Johansen --- security/apparmor/lsm.c | 1063 +++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 1063 insertions(+), 0 deletions(-) create mode 100644 security/apparmor/lsm.c diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c new file mode 100644 index 0000000..6ee3480 --- /dev/null +++ b/security/apparmor/lsm.c @@ -0,0 +1,1063 @@ +/* + * AppArmor security module + * + * This file contains AppArmor LSM hooks. + * + * Copyright (C) 1998-2008 Novell/SUSE + * Copyright 2009 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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/net.h" +#include "include/path.h" +#include "include/policy.h" +#include "include/procattr.h" + +/* Flag indicating whether initialization completed */ +int apparmor_initialized; + +/* + * LSM hook functions + */ + +/* + * free the associated aa_task_context and put its profiles + */ +static void apparmor_cred_free(struct cred *cred) +{ + aa_free_task_context(cred->security); + cred->security = 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_context *cxt = aa_alloc_task_context(gfp); + if (cxt) + return -ENOMEM; + + cred->security = cxt; + return 0; +} + +/* + * prepare new aa_task_context 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_context *cxt = aa_alloc_task_context(gfp); + if (!cxt) + return -ENOMEM; + + aa_dup_task_context(cxt, old->security); + new->security = 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_context *old_cxt = old->security; + struct aa_task_context *new_cxt = new->security; + + aa_dup_task_context(new_cxt, old_cxt); +} + +static int apparmor_ptrace_access_check(struct task_struct *child, + unsigned int mode) +{ + return aa_ptrace(current, child, mode); +} + +static int apparmor_ptrace_traceme(struct task_struct *parent) +{ + 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); + aa_cred_policy(cred, &profile); + + *effective = cred->cap_effective; + *inheritable = cred->cap_inheritable; + *permitted = cred->cap_permitted; + + if (profile) { + *effective = cap_combine(*effective, profile->caps.set); + *effective = cap_intersect(*effective, profile->caps.allowed); + } + rcu_read_unlock(); + + return 0; +} + +static int apparmor_capable(struct task_struct *task, const struct cred *cred, + int cap, int audit) +{ + struct aa_profile *profile; + /* cap_capable returns 0 on success, else -EPERM */ + int error = cap_capable(task, cred, cap, audit); + + aa_cred_policy(cred, &profile); + if (profile && (!error || cap_raised(profile->caps.set, cap))) + error = aa_capable(task, profile, cap, audit); + + return error; +} + +static int apparmor_sysctl(struct ctl_table *table, int op) +{ + int error = 0; + struct aa_profile *profile = aa_current_profile_wupd(); + + if (profile) { + char *buffer, *name; + int mask; + + mask = 0; + if (op & 4) + mask |= MAY_READ; + if (op & 2) + mask |= MAY_WRITE; + + error = -ENOMEM; + /* freed below */ + buffer = (char *)__get_free_page(GFP_KERNEL); + if (!buffer) + goto out; + + /* + * TODO: convert this over to using a global or per + * namespace control instead of a hard coded /proc + */ + name = sysctl_pathname(table, buffer, PAGE_SIZE); + if (name && name - buffer >= 5) { + struct path_cond cond = { 0, S_IFREG }; + name -= 5; + memcpy(name, "/proc", 5); + error = aa_pathstr_perm(profile, "sysctl", name, mask, + &cond); + } + free_page((unsigned long)buffer); + } + +out: + return error; +} + +static int common_perm(const char *op, struct path *path, u16 mask, + struct path_cond *cond) +{ + struct aa_profile *profile; + int error = 0; + + profile = aa_current_profile(); + if (profile) + error = aa_path_perm(profile, op, path, mask, cond); + + return error; +} + +static int common_perm_dentry(const char *op, struct path *dir, + struct dentry *dentry, u16 mask, + struct path_cond *cond) +{ + struct path path = { dir->mnt, dentry }; + + return common_perm(op, &path, mask, cond); +} + +static int common_perm_rm(const char *op, struct path *dir, + struct dentry *dentry, u16 mask) +{ + struct inode *inode = dentry->d_inode; + struct path_cond cond = { }; + + if (!dir->mnt || !inode || !mediated_filesystem(inode)) + return 0; + + cond.uid = inode->i_uid; + cond.mode = inode->i_mode; + + return common_perm_dentry(op, dir, dentry, mask, &cond); +} + +static int common_perm_create(const char *op, struct path *dir, + struct dentry *dentry, u16 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_dentry(op, dir, dentry, mask, &cond); +} + +static int apparmor_path_unlink(struct path *dir, struct dentry *dentry) +{ + return common_perm_rm("unlink", dir, dentry, MAY_WRITE); +} + +static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry, + int mode) +{ + return common_perm_create("mkdir", dir, dentry, AA_MAY_CREATE, S_IFDIR); +} + +static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry) +{ + return common_perm_rm("rmdir", dir, dentry, MAY_WRITE); +} + +static int apparmor_path_mknod(struct path *dir, struct dentry *dentry, + int mode, unsigned int dev) +{ + return common_perm_create("mknod", dir, dentry, AA_MAY_CREATE, mode); +} + +static int apparmor_path_truncate(struct path *path, loff_t length, + unsigned int time_attrs) +{ + 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("truncate", path, MAY_WRITE, &cond); +} + +static int apparmor_path_symlink(struct path *dir, struct dentry *dentry, + const char *old_name) +{ + return common_perm_create("symlink_create", 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_wupd(); + if (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_wupd(); + if (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(profile, "rename_src", &old_path, + MAY_READ | MAY_WRITE, &cond); + if (!error) + error = aa_path_perm(profile, "rename_dest", &new_path, + AA_MAY_CREATE | MAY_WRITE, &cond); + + } + return error; +} + +static int apparmor_dentry_open(struct file *file, const struct cred *cred) +{ + struct aa_profile *profile; + int error = 0; + + /* If in exec permission is handled by bprm hooks */ + if (current->in_execve || + !mediated_filesystem(file->f_path.dentry->d_inode)) + return 0; + + aa_cred_policy(cred, &profile); + if (profile) { + struct aa_file_cxt *fcxt = file->f_security; + struct inode *inode = file->f_path.dentry->d_inode; + struct path_cond cond = { inode->i_uid, inode->i_mode }; + + error = aa_path_perm(profile, "open", &file->f_path, + aa_map_file_to_perms(file), &cond); + /* released by aa_free_file_context */ + fcxt->profile = aa_get_profile(profile); + /* todo cache actual allowed permissions */ + fcxt->allowed = 0; + } + + 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 apparmor_file_permission(struct file *file, int mask) +{ + /* + * TODO: cache profiles that have revalidated? + */ + struct aa_file_cxt *fcxt = file->f_security; + struct aa_profile *profile, *fprofile = fcxt->profile; + int error = 0; + + if (!fprofile || !file->f_path.mnt || + !mediated_filesystem(file->f_path.dentry->d_inode)) + return 0; + + profile = aa_current_profile(); + +#ifdef CONFIG_SECURITY_APPARMOR_COMPAT_24 + /* + * AppArmor <= 2.4 revalidates files at access time instead + * of at exec. + */ + if (profile && ((fprofile != profile) || (mask & ~fcxt->allowed))) + error = aa_file_perm(profile, "file_perm", file, mask); +#endif + + return error; +} + +static int common_file_perm(const char *op, struct file *file, u16 mask) +{ + const struct aa_file_cxt *fcxt = file->f_security; + struct aa_profile *profile, *fprofile = fcxt->profile; + int error = 0; + + if (!fprofile || !file->f_path.mnt || + !mediated_filesystem(file->f_path.dentry->d_inode)) + return 0; + + profile = aa_current_profile_wupd(); + if (profile && ((fprofile != profile) || (mask & ~fcxt->allowed))) + error = aa_file_perm(profile, op, file, mask); + + return error; +} + +static int apparmor_file_lock(struct file *file, unsigned int cmd) +{ + u16 mask = AA_MAY_LOCK; + + if (cmd == F_WRLCK) + mask |= MAY_WRITE; + + return common_file_perm("file_lock", file, mask); +} + +static int common_mmap(struct file *file, const char *operation, + unsigned long prot, unsigned long flags) +{ + struct dentry *dentry; + 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; + + dentry = file->f_path.dentry; + return common_file_perm(operation, file, mask); +} + +static int apparmor_file_mmap(struct file *file, unsigned long reqprot, + unsigned long prot, unsigned long flags, + unsigned long addr, unsigned long addr_only) +{ + int rc = 0; + struct aa_profile *profile = aa_current_profile_wupd(); + /* + * test before cap_file_mmap. For confined tasks AppArmor will + * enforce the mmap value set in the profile or default + * to LSM_MMAP_MIN_ADDR + */ + if (profile) { + if (profile->flags & PFLAG_MMAP_MIN_ADDR) { + if (addr < profile->mmap_min_addr) + rc = -EACCES; + } else if (addr < CONFIG_LSM_MMAP_MIN_ADDR) { + rc = -EACCES; + } + if (rc) { + struct aa_audit sa = { + .operation = "file_mmap", + .gfp_mask = GFP_KERNEL, + .info = "addr < mmap_min_addr", + .error = rc, + }; + return aa_audit(AUDIT_APPARMOR_DENIED, profile, &sa, + NULL); + } + } + rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); + if (rc || addr_only) + return rc; + + return common_mmap(file, "file_mmap", prot, flags); +} + +static int apparmor_file_mprotect(struct vm_area_struct *vma, + unsigned long reqprot, unsigned long prot) +{ + return common_mmap(vma->vm_file, "file_mprotect", prot, + !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); +} + +static int apparmor_getprocattr(struct task_struct *task, char *name, + char **value) +{ + int error = -ENOENT; + struct aa_namespace *ns; + struct aa_profile *profile, *onexec, *prev; + /* released below */ + const struct cred *cred = aa_get_task_policy(task, &profile); + struct aa_task_context *cxt = cred->security; + ns = cxt->sys.profile->ns; + onexec = cxt->sys.onexec; + prev = cxt->sys.previous; + + /* task must be either querying itself, unconfined or can ptrace */ + if (current != task && profile && !capable(CAP_SYS_PTRACE)) { + error = -EPERM; + } else { + if (strcmp(name, "current") == 0) { + error = aa_getprocattr(ns, profile, value); + } else if (strcmp(name, "prev") == 0) { + if (prev) + error = aa_getprocattr(ns, prev, value); + } else if (strcmp(name, "exec") == 0) { + if (onexec) + error = aa_getprocattr(ns, 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) +{ + char *command, *args; + int error; + + if (size == 0 || size >= PAGE_SIZE) + return -EINVAL; + + /* task can only write its own attributes */ + if (current != task) + return -EACCES; + + args = value; + args[size] = '\0'; + args = strstrip(args); + command = strsep(&args, " "); + if (!args) + return -EINVAL; + while (isspace(*args)) + args++; + if (!*args) + return -EINVAL; + + if (strcmp(name, "current") == 0) { + if (strcmp(command, "changehat") == 0) { + error = aa_setprocattr_changehat(args, !AA_DO_TEST); + } else if (strcmp(command, "permhat") == 0) { + error = aa_setprocattr_changehat(args, AA_DO_TEST); + } else if (strcmp(command, "changeprofile") == 0) { + error = aa_setprocattr_changeprofile(args, 0, + !AA_DO_TEST); + } else if (strcmp(command, "permprofile") == 0) { + error = aa_setprocattr_changeprofile(args, 0, + AA_DO_TEST); + } else if (strcmp(command, "permipc") == 0) { + error = aa_setprocattr_permipc(args); + } else { + struct aa_audit sa = { + .operation = "setprocattr", + .gfp_mask = GFP_KERNEL, + .info = name, + .error = -EINVAL, + }; + return aa_audit(AUDIT_APPARMOR_DENIED, NULL, &sa, NULL); + } + } else if (strcmp(name, "exec") == 0) { + error = aa_setprocattr_changeprofile(strstrip(args), 1, + !AA_DO_TEST); + } else { + /* only support the "current" and "exec" process attributes */ + return -EINVAL; + } + if (!error) + error = size; + return error; +} + +static int apparmor_task_setrlimit(unsigned int resource, + struct rlimit *new_rlim) +{ + struct aa_profile *profile = aa_current_profile_wupd(); + int error = 0; + + if (profile) + error = aa_task_setrlimit(profile, resource, new_rlim); + + return error; +} + +#ifdef CONFIG_SECURITY_APPARMOR_NETWORK +static int apparmor_socket_create(int family, int type, int protocol, int kern) +{ + struct aa_profile *profile; + int error = 0; + + if (kern) + return 0; + + profile = aa_current_profile(); + if (profile) + error = aa_net_perm(profile, "socket_create", family, + type, protocol); + return error; +} + +static int apparmor_socket_post_create(struct socket *sock, int family, + int type, int protocol, int kern) +{ + struct sock *sk = sock->sk; + + if (kern) + return 0; + + return aa_revalidate_sk(sk, "socket_post_create"); +} + +static int apparmor_socket_bind(struct socket *sock, + struct sockaddr *address, int addrlen) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_bind"); +} + +static int apparmor_socket_connect(struct socket *sock, + struct sockaddr *address, int addrlen) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_connect"); +} + +static int apparmor_socket_listen(struct socket *sock, int backlog) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_listen"); +} + +static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_accept"); +} + +static int apparmor_socket_sendmsg(struct socket *sock, + struct msghdr *msg, int size) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_sendmsg"); +} + +static int apparmor_socket_recvmsg(struct socket *sock, + struct msghdr *msg, int size, int flags) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_recvmsg"); +} + +static int apparmor_socket_getsockname(struct socket *sock) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_getsockname"); +} + +static int apparmor_socket_getpeername(struct socket *sock) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_getpeername"); +} + +static int apparmor_socket_getsockopt(struct socket *sock, int level, + int optname) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_getsockopt"); +} + +static int apparmor_socket_setsockopt(struct socket *sock, int level, + int optname) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_setsockopt"); +} + +static int apparmor_socket_shutdown(struct socket *sock, int how) +{ + struct sock *sk = sock->sk; + + return aa_revalidate_sk(sk, "socket_shutdown"); +} +#endif + +static struct security_operations apparmor_ops = { + .name = "apparmor", + + .ptrace_access_check = apparmor_ptrace_access_check, + .ptrace_traceme = apparmor_ptrace_traceme, + .capget = apparmor_capget, + .sysctl = apparmor_sysctl, + .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_truncate = apparmor_path_truncate, + .dentry_open = apparmor_dentry_open, + + .file_permission = apparmor_file_permission, + .file_alloc_security = apparmor_file_alloc_security, + .file_free_security = apparmor_file_free_security, + .file_mmap = apparmor_file_mmap, + .file_mprotect = apparmor_file_mprotect, + .file_lock = apparmor_file_lock, + + .getprocattr = apparmor_getprocattr, + .setprocattr = apparmor_setprocattr, + +#ifdef CONFIG_SECURITY_APPARMOR_NETWORK + .socket_create = apparmor_socket_create, + .socket_post_create = apparmor_socket_post_create, + .socket_bind = apparmor_socket_bind, + .socket_connect = apparmor_socket_connect, + .socket_listen = apparmor_socket_listen, + .socket_accept = apparmor_socket_accept, + .socket_sendmsg = apparmor_socket_sendmsg, + .socket_recvmsg = apparmor_socket_recvmsg, + .socket_getsockname = apparmor_socket_getsockname, + .socket_getpeername = apparmor_socket_getpeername, + .socket_getsockopt = apparmor_socket_getsockopt, + .socket_setsockopt = apparmor_socket_setsockopt, + .socket_shutdown = apparmor_socket_shutdown, +#endif + + .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, struct kernel_param *kp); +static int param_get_aabool(char *buffer, struct kernel_param *kp); +#define param_check_aabool(name, p) __param_check(name, p, int) + +static int param_set_aauint(const char *val, struct kernel_param *kp); +static int param_get_aauint(char *buffer, struct kernel_param *kp); +#define param_check_aauint(name, p) __param_check(name, p, int) + +static int param_set_aalockpolicy(const char *val, struct kernel_param *kp); +static int param_get_aalockpolicy(char *buffer, struct kernel_param *kp); +#define param_check_aalockpolicy(name, p) __param_check(name, p, int) + +static int param_set_audit(const char *val, struct kernel_param *kp); +static int param_get_audit(char *buffer, struct kernel_param *kp); +#define param_check_audit(name, p) __param_check(name, p, int) + +static int param_set_mode(const char *val, struct kernel_param *kp); +static int param_get_mode(char *buffer, struct kernel_param *kp); +#define param_check_mode(name, p) __param_check(name, p, int) + +/* 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 */ +int 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 + */ +int aa_g_audit_header; +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 + */ +int aa_g_lock_policy; +module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, + S_IRUSR | S_IWUSR); + +/* Syscall logging mode */ +int 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); + +/* Boot time disable flag */ +#ifdef CONFIG_SECURITY_APPARMOR_DISABLE +#define AA_ENABLED_PERMS 0600 +#else +#define AA_ENABLED_PERMS 0400 +#endif +static int param_set_aa_enabled(const char *val, struct kernel_param *kp); +static unsigned int apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; +module_param_call(enabled, param_set_aa_enabled, param_get_aauint, + &apparmor_enabled, AA_ENABLED_PERMS); + +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, struct kernel_param *kp) +{ + if (__aa_task_is_confined(current)) + return -EPERM; + if (aa_g_lock_policy) + return -EACCES; + return param_set_bool(val, kp); +} + +static int param_get_aalockpolicy(char *buffer, struct kernel_param *kp) +{ + if (__aa_task_is_confined(current)) + return -EPERM; + return param_get_bool(buffer, kp); +} + +static int param_set_aabool(const char *val, struct kernel_param *kp) +{ + if (__aa_task_is_confined(current)) + return -EPERM; + return param_set_bool(val, kp); +} + +static int param_get_aabool(char *buffer, struct kernel_param *kp) +{ + if (__aa_task_is_confined(current)) + return -EPERM; + return param_get_bool(buffer, kp); +} + +static int param_set_aauint(const char *val, struct kernel_param *kp) +{ + if (__aa_task_is_confined(current)) + return -EPERM; + return param_set_uint(val, kp); +} + +static int param_get_aauint(char *buffer, struct kernel_param *kp) +{ + if (__aa_task_is_confined(current)) + return -EPERM; + return param_get_uint(buffer, kp); +} + +/* allow run time disabling of apparmor */ +static int param_set_aa_enabled(const char *val, struct kernel_param *kp) +{ + unsigned long l; + + if (!apparmor_initialized) { + apparmor_enabled = 0; + return 0; + } + + if (__aa_task_is_confined(current)) + return -EPERM; + + if (!apparmor_enabled) + return -EINVAL; + + if (!val) + return -EINVAL; + + if (strict_strtoul(val, 0, &l) || l != 0) + return -EINVAL; + + apparmor_enabled = 0; + apparmor_disable(); + return 0; +} + +static int param_get_audit(char *buffer, struct kernel_param *kp) +{ + if (__aa_task_is_confined(current)) + 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 (__aa_task_is_confined(current)) + 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 (__aa_task_is_confined(current)) + 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 (__aa_task_is_confined(current)) + 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 + */ +static int __init set_init_cxt(void) +{ + struct cred *cred = (struct cred *)current->real_cred; + struct aa_task_context *cxt; + + cxt = aa_alloc_task_context(GFP_KERNEL); + if (!cxt) + return -ENOMEM; + + cxt->sys.profile = aa_get_profile(default_namespace->unconfined); + cred->security = 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\n"); + apparmor_enabled = 0; + return 0; + } + + error = aa_alloc_default_namespace(); + 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 alloc_out; + } + + error = register_security(&apparmor_ops); + if (error) { + 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_default_namespace(); + +alloc_out: + aa_destroy_aafs(); + + apparmor_enabled = 0; + return error; + +} + +security_initcall(apparmor_init); + +void apparmor_disable(void) +{ + /* Remove and release all the profiles on the profile list. */ + aa_profile_ns_list_release(); + + /* FIXME: cleanup profiles references on files */ + aa_free_default_namespace(); + + aa_destroy_aafs(); + apparmor_initialized = 0; + + aa_info_message("AppArmor protection disabled"); +} -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/