1 |
/* |
2 |
* fs/sakura_chroot.c |
3 |
* |
4 |
* Implementation of the Domain-Free Mandatory Access Control. |
5 |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
7 |
* |
8 |
* Version: 1.6.0-pre 2008/01/03 |
9 |
* |
10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
* See README.ccs for ChangeLog. |
12 |
* |
13 |
*/ |
14 |
/***** SAKURA Linux start. *****/ |
15 |
|
16 |
#include <linux/ccs_common.h> |
17 |
#include <linux/sakura.h> |
18 |
#include <linux/realpath.h> |
19 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
20 |
#include <linux/namei.h> |
21 |
#else |
22 |
#include <linux/fs.h> |
23 |
#endif |
24 |
|
25 |
extern const char *ccs_log_level; |
26 |
|
27 |
/***** The structure for chroot restrictions. *****/ |
28 |
|
29 |
struct chroot_entry { |
30 |
struct list1_head list; |
31 |
const struct path_info *dir; |
32 |
bool is_deleted; |
33 |
}; |
34 |
|
35 |
/************************* CHROOT RESTRICTION HANDLER *************************/ |
36 |
|
37 |
static LIST1_HEAD(chroot_list); |
38 |
|
39 |
static int AddChrootACL(const char *dir, const bool is_delete) |
40 |
{ |
41 |
struct chroot_entry *new_entry, *ptr; |
42 |
const struct path_info *saved_dir; |
43 |
static DEFINE_MUTEX(lock); |
44 |
int error = -ENOMEM; |
45 |
if (!IsCorrectPath(dir, 1, 0, 1, __FUNCTION__)) return -EINVAL; |
46 |
if ((saved_dir = SaveName(dir)) == NULL) return -ENOMEM; |
47 |
mutex_lock(&lock); |
48 |
list1_for_each_entry(ptr, &chroot_list, list) { |
49 |
if (ptr->dir == saved_dir) { |
50 |
ptr->is_deleted = is_delete; |
51 |
error = 0; |
52 |
goto out; |
53 |
} |
54 |
} |
55 |
if (is_delete) { |
56 |
error = -ENOENT; |
57 |
goto out; |
58 |
} |
59 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
60 |
new_entry->dir = saved_dir; |
61 |
list1_add_tail_mb(&new_entry->list, &chroot_list); |
62 |
error = 0; |
63 |
printk("%sAllow chroot() to %s\n", ccs_log_level, dir); |
64 |
out: |
65 |
mutex_unlock(&lock); |
66 |
return error; |
67 |
} |
68 |
|
69 |
int CheckChRootPermission(struct nameidata *nd) |
70 |
{ |
71 |
int error = -EPERM; |
72 |
char *root_name; |
73 |
const u8 mode = CheckCCSFlags(CCS_SAKURA_RESTRICT_CHROOT); |
74 |
if (!mode) return 0; |
75 |
root_name = realpath_from_dentry(nd->dentry, nd->mnt); |
76 |
if (root_name) { |
77 |
struct path_info dir; |
78 |
dir.name = root_name; |
79 |
fill_path_info(&dir); |
80 |
if (dir.is_dir) { |
81 |
struct chroot_entry *ptr; |
82 |
list1_for_each_entry(ptr, &chroot_list, list) { |
83 |
if (ptr->is_deleted) continue; |
84 |
if (PathMatchesToPattern(&dir, ptr->dir)) { |
85 |
error = 0; |
86 |
break; |
87 |
} |
88 |
} |
89 |
} |
90 |
} |
91 |
if (error) { |
92 |
const bool is_enforce = (mode == 3); |
93 |
const char *exename = GetEXE(); |
94 |
printk("SAKURA-%s: chroot %s (pid=%d:exe=%s): Permission denied.\n", GetMSG(is_enforce), root_name, current->pid, exename); |
95 |
if (is_enforce && CheckSupervisor("# %s is requesting\nchroot %s\n", exename, root_name) == 0) error = 0; |
96 |
if (exename) ccs_free(exename); |
97 |
if (mode == 1 && root_name) { |
98 |
AddChrootACL(root_name, 0); |
99 |
UpdateCounter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
100 |
} |
101 |
if (!is_enforce) error = 0; |
102 |
} |
103 |
ccs_free(root_name); |
104 |
return error; |
105 |
} |
106 |
|
107 |
int AddChrootPolicy(char *data, const bool is_delete) |
108 |
{ |
109 |
return AddChrootACL(data, is_delete); |
110 |
} |
111 |
|
112 |
int ReadChrootPolicy(struct io_buffer *head) |
113 |
{ |
114 |
struct list1_head *pos; |
115 |
list1_for_each_cookie(pos, head->read_var2, &chroot_list) { |
116 |
struct chroot_entry *ptr; |
117 |
ptr = list1_entry(pos, struct chroot_entry, list); |
118 |
if (ptr->is_deleted) continue; |
119 |
if (io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", ptr->dir->name)) return -ENOMEM; |
120 |
} |
121 |
return 0; |
122 |
} |
123 |
|
124 |
/***** SAKURA Linux end. *****/ |