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kumaneko |
111 |
/* |
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* fs/sakura_chroot.c |
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* |
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* Implementation of the Domain-Free Mandatory Access Control. |
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* |
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kumaneko |
852 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
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kumaneko |
111 |
* |
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kumaneko |
990 |
* Version: 1.6.0-pre 2008/02/16 |
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kumaneko |
111 |
* |
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* This file is applicable to both 2.4.30 and 2.6.11 and later. |
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* See README.ccs for ChangeLog. |
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* |
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*/ |
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/***** SAKURA Linux start. *****/ |
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#include <linux/ccs_common.h> |
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#include <linux/sakura.h> |
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#include <linux/realpath.h> |
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kumaneko |
141 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
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#include <linux/namei.h> |
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#else |
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#include <linux/fs.h> |
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#endif |
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kumaneko |
111 |
|
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extern const char *ccs_log_level; |
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/***** The structure for chroot restrictions. *****/ |
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kumaneko |
214 |
struct chroot_entry { |
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kumaneko |
722 |
struct list1_head list; |
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kumaneko |
111 |
const struct path_info *dir; |
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kumaneko |
621 |
bool is_deleted; |
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kumaneko |
214 |
}; |
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kumaneko |
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|
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/************************* CHROOT RESTRICTION HANDLER *************************/ |
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kumaneko |
722 |
static LIST1_HEAD(chroot_list); |
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kumaneko |
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|
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kumaneko |
621 |
static int AddChrootACL(const char *dir, const bool is_delete) |
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kumaneko |
111 |
{ |
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kumaneko |
214 |
struct chroot_entry *new_entry, *ptr; |
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kumaneko |
111 |
const struct path_info *saved_dir; |
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kumaneko |
652 |
static DEFINE_MUTEX(lock); |
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kumaneko |
111 |
int error = -ENOMEM; |
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if (!IsCorrectPath(dir, 1, 0, 1, __FUNCTION__)) return -EINVAL; |
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if ((saved_dir = SaveName(dir)) == NULL) return -ENOMEM; |
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kumaneko |
652 |
mutex_lock(&lock); |
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kumaneko |
722 |
list1_for_each_entry(ptr, &chroot_list, list) { |
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kumaneko |
141 |
if (ptr->dir == saved_dir) { |
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kumaneko |
111 |
ptr->is_deleted = is_delete; |
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error = 0; |
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goto out; |
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} |
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} |
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if (is_delete) { |
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error = -ENOENT; |
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goto out; |
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} |
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kumaneko |
214 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
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kumaneko |
111 |
new_entry->dir = saved_dir; |
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kumaneko |
722 |
list1_add_tail_mb(&new_entry->list, &chroot_list); |
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kumaneko |
111 |
error = 0; |
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printk("%sAllow chroot() to %s\n", ccs_log_level, dir); |
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out: |
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kumaneko |
652 |
mutex_unlock(&lock); |
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kumaneko |
111 |
return error; |
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} |
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kumaneko |
141 |
int CheckChRootPermission(struct nameidata *nd) |
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kumaneko |
111 |
{ |
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kumaneko |
141 |
int error = -EPERM; |
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char *root_name; |
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kumaneko |
852 |
const u8 mode = CheckCCSFlags(CCS_SAKURA_RESTRICT_CHROOT); |
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kumaneko |
815 |
if (!mode) return 0; |
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kumaneko |
992 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) |
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kumaneko |
990 |
root_name = realpath_from_dentry(nd->path.dentry, nd->path.mnt); |
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#else |
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kumaneko |
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root_name = realpath_from_dentry(nd->dentry, nd->mnt); |
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kumaneko |
990 |
#endif |
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kumaneko |
141 |
if (root_name) { |
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kumaneko |
111 |
struct path_info dir; |
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kumaneko |
141 |
dir.name = root_name; |
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kumaneko |
111 |
fill_path_info(&dir); |
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if (dir.is_dir) { |
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kumaneko |
214 |
struct chroot_entry *ptr; |
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kumaneko |
722 |
list1_for_each_entry(ptr, &chroot_list, list) { |
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kumaneko |
111 |
if (ptr->is_deleted) continue; |
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if (PathMatchesToPattern(&dir, ptr->dir)) { |
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kumaneko |
141 |
error = 0; |
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kumaneko |
111 |
break; |
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} |
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} |
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} |
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} |
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kumaneko |
141 |
if (error) { |
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kumaneko |
815 |
const bool is_enforce = (mode == 3); |
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kumaneko |
141 |
const char *exename = GetEXE(); |
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printk("SAKURA-%s: chroot %s (pid=%d:exe=%s): Permission denied.\n", GetMSG(is_enforce), root_name, current->pid, exename); |
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if (is_enforce && CheckSupervisor("# %s is requesting\nchroot %s\n", exename, root_name) == 0) error = 0; |
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kumaneko |
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if (exename) ccs_free(exename); |
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kumaneko |
815 |
if (mode == 1 && root_name) { |
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kumaneko |
141 |
AddChrootACL(root_name, 0); |
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kumaneko |
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UpdateCounter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
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} |
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kumaneko |
141 |
if (!is_enforce) error = 0; |
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kumaneko |
111 |
} |
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kumaneko |
141 |
ccs_free(root_name); |
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return error; |
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kumaneko |
111 |
} |
110 |
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111 |
kumaneko |
621 |
int AddChrootPolicy(char *data, const bool is_delete) |
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kumaneko |
111 |
{ |
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return AddChrootACL(data, is_delete); |
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} |
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kumaneko |
214 |
int ReadChrootPolicy(struct io_buffer *head) |
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kumaneko |
111 |
{ |
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kumaneko |
722 |
struct list1_head *pos; |
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list1_for_each_cookie(pos, head->read_var2, &chroot_list) { |
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kumaneko |
708 |
struct chroot_entry *ptr; |
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kumaneko |
722 |
ptr = list1_entry(pos, struct chroot_entry, list); |
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kumaneko |
708 |
if (ptr->is_deleted) continue; |
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if (io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", ptr->dir->name)) return -ENOMEM; |
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kumaneko |
111 |
} |
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kumaneko |
708 |
return 0; |
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kumaneko |
111 |
} |
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/***** SAKURA Linux end. *****/ |