3 |
* |
* |
4 |
* Implementation of the Domain-Free Mandatory Access Control. |
* Implementation of the Domain-Free Mandatory Access Control. |
5 |
* |
* |
6 |
* Copyright (C) 2005-2007 NTT DATA CORPORATION |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
7 |
* |
* |
8 |
* Version: 1.3.3 2007/04/01 |
* Version: 1.6.5-pre 2008/09/09 |
9 |
* |
* |
10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
12 |
* |
* |
13 |
*/ |
*/ |
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/***** SAKURA Linux start. *****/ |
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14 |
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15 |
#include <linux/ccs_common.h> |
#include <linux/ccs_common.h> |
16 |
#include <linux/sakura.h> |
#include <linux/sakura.h> |
17 |
#include <linux/realpath.h> |
#include <linux/realpath.h> |
18 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
19 |
#include <linux/namei.h> |
#include <linux/namei.h> |
20 |
#else |
#else |
21 |
#include <linux/fs.h> |
#include <linux/fs.h> |
22 |
#endif |
#endif |
23 |
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|
24 |
extern const char *ccs_log_level; |
/* Structure for "allow_chroot" keyword. */ |
25 |
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struct chroot_entry { |
26 |
/***** The structure for chroot restrictions. *****/ |
struct list1_head list; |
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typedef struct chroot_entry { |
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struct chroot_entry *next; |
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27 |
const struct path_info *dir; |
const struct path_info *dir; |
28 |
int is_deleted; |
bool is_deleted; |
29 |
} CHROOT_ENTRY; |
}; |
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/************************* CHROOT RESTRICTION HANDLER *************************/ |
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30 |
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31 |
static CHROOT_ENTRY *chroot_list = NULL; |
/* The list for "struct chroot_entry". */ |
32 |
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static LIST1_HEAD(chroot_list); |
33 |
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34 |
static int AddChrootACL(const char *dir, const int is_delete) |
/** |
35 |
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* update_chroot_acl - Update "struct chroot_entry" list. |
36 |
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* |
37 |
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* @dir: The name of directory. |
38 |
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* @is_delete: True if it is a delete request. |
39 |
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* |
40 |
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* Returns 0 on success, negative value otherwise. |
41 |
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*/ |
42 |
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static int update_chroot_acl(const char *dir, const bool is_delete) |
43 |
{ |
{ |
44 |
CHROOT_ENTRY *new_entry, *ptr; |
struct chroot_entry *new_entry; |
45 |
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struct chroot_entry *ptr; |
46 |
const struct path_info *saved_dir; |
const struct path_info *saved_dir; |
47 |
static DECLARE_MUTEX(lock); |
static DEFINE_MUTEX(lock); |
48 |
int error = -ENOMEM; |
int error = -ENOMEM; |
49 |
if (!IsCorrectPath(dir, 1, 0, 1, __FUNCTION__)) return -EINVAL; |
if (!ccs_is_correct_path(dir, 1, 0, 1, __func__)) |
50 |
if ((saved_dir = SaveName(dir)) == NULL) return -ENOMEM; |
return -EINVAL; |
51 |
down(&lock); |
saved_dir = ccs_save_name(dir); |
52 |
for (ptr = chroot_list; ptr; ptr = ptr->next) { |
if (!saved_dir) |
53 |
if (ptr->dir == saved_dir) { |
return -ENOMEM; |
54 |
ptr->is_deleted = is_delete; |
mutex_lock(&lock); |
55 |
error = 0; |
list1_for_each_entry(ptr, &chroot_list, list) { |
56 |
goto out; |
if (ptr->dir != saved_dir) |
57 |
} |
continue; |
58 |
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ptr->is_deleted = is_delete; |
59 |
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error = 0; |
60 |
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goto out; |
61 |
} |
} |
62 |
if (is_delete) { |
if (is_delete) { |
63 |
error = -ENOENT; |
error = -ENOENT; |
64 |
goto out; |
goto out; |
65 |
} |
} |
66 |
if ((new_entry = (CHROOT_ENTRY *) alloc_element(sizeof(CHROOT_ENTRY))) == NULL) goto out; |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
67 |
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if (!new_entry) |
68 |
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goto out; |
69 |
new_entry->dir = saved_dir; |
new_entry->dir = saved_dir; |
70 |
mb(); /* Instead of using spinlock. */ |
list1_add_tail_mb(&new_entry->list, &chroot_list); |
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if ((ptr = chroot_list) != NULL) { |
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while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
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} else { |
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chroot_list = new_entry; |
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} |
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71 |
error = 0; |
error = 0; |
72 |
printk("%sAllow chroot() to %s\n", ccs_log_level, dir); |
printk(KERN_CONT "%sAllow chroot() to %s\n", ccs_log_level, dir); |
73 |
out: |
out: |
74 |
up(&lock); |
mutex_unlock(&lock); |
75 |
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ccs_update_counter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
76 |
return error; |
return error; |
77 |
} |
} |
78 |
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79 |
int CheckChRootPermission(struct nameidata *nd) |
/** |
80 |
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* print_error - Print error message. |
81 |
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* |
82 |
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* @root_name: Requested directory name. |
83 |
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* @mode: Access control mode. |
84 |
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* |
85 |
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* Returns 0 if @mode is not enforcing mode or permitted by the administrator's |
86 |
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* decision, negative value otherwise. |
87 |
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*/ |
88 |
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static int print_error(const char *root_name, const u8 mode) |
89 |
{ |
{ |
90 |
int error = -EPERM; |
int error; |
91 |
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const bool is_enforce = (mode == 3); |
92 |
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const char *exename = ccs_get_exe(); |
93 |
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printk(KERN_WARNING "SAKURA-%s: chroot %s (pid=%d:exe=%s): " |
94 |
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"Permission denied.\n", ccs_get_msg(is_enforce), |
95 |
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root_name, current->pid, exename); |
96 |
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if (is_enforce) |
97 |
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error = ccs_check_supervisor(NULL, "# %s is requesting\n" |
98 |
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"chroot %s\n", exename, root_name); |
99 |
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else |
100 |
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error = 0; |
101 |
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if (exename) |
102 |
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ccs_free(exename); |
103 |
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if (mode == 1 && root_name) |
104 |
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update_chroot_acl(root_name, false); |
105 |
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return error; |
106 |
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} |
107 |
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108 |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) |
109 |
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#define PATH_or_NAMEIDATA path |
110 |
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#else |
111 |
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#define PATH_or_NAMEIDATA nameidata |
112 |
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#endif |
113 |
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/** |
114 |
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* ccs_check_chroot_permission - Check permission for chroot(). |
115 |
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* |
116 |
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* @path: Pointer to "struct path" (for 2.6.27 and later). |
117 |
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* Pointer to "struct nameidata" (for 2.6.26 and earlier). |
118 |
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* |
119 |
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* Returns 0 on success, negative value otherwise. |
120 |
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*/ |
121 |
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int ccs_check_chroot_permission(struct PATH_or_NAMEIDATA *path) |
122 |
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{ |
123 |
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int error; |
124 |
char *root_name; |
char *root_name; |
125 |
if (!CheckCCSFlags(CCS_SAKURA_RESTRICT_CHROOT)) return 0; |
const u8 mode = ccs_check_flags(CCS_SAKURA_RESTRICT_CHROOT); |
126 |
root_name = realpath_from_dentry(nd->dentry, nd->mnt); |
if (!mode) |
127 |
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return 0; |
128 |
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retry: |
129 |
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error = -EPERM; |
130 |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) && LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 26) |
131 |
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root_name = ccs_realpath_from_dentry(path->path.dentry, path->path.mnt); |
132 |
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#else |
133 |
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root_name = ccs_realpath_from_dentry(path->dentry, path->mnt); |
134 |
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#endif |
135 |
if (root_name) { |
if (root_name) { |
136 |
struct path_info dir; |
struct path_info dir; |
137 |
dir.name = root_name; |
dir.name = root_name; |
138 |
fill_path_info(&dir); |
ccs_fill_path_info(&dir); |
139 |
if (dir.is_dir) { |
if (dir.is_dir) { |
140 |
CHROOT_ENTRY *ptr; |
struct chroot_entry *ptr; |
141 |
for (ptr = chroot_list; ptr; ptr = ptr->next) { |
list1_for_each_entry(ptr, &chroot_list, list) { |
142 |
if (ptr->is_deleted) continue; |
if (ptr->is_deleted) |
143 |
if (PathMatchesToPattern(&dir, ptr->dir)) { |
continue; |
144 |
error = 0; |
if (!ccs_path_matches_pattern(&dir, ptr->dir)) |
145 |
break; |
continue; |
146 |
} |
error = 0; |
147 |
|
break; |
148 |
} |
} |
149 |
} |
} |
150 |
} |
} |
151 |
if (error) { |
if (error) |
152 |
const int is_enforce = CheckCCSEnforce(CCS_SAKURA_RESTRICT_CHROOT); |
error = print_error(root_name, mode); |
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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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if (exename) ccs_free(exename); |
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if (!is_enforce && CheckCCSAccept(CCS_SAKURA_RESTRICT_CHROOT) && root_name) { |
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AddChrootACL(root_name, 0); |
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UpdateCounter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
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} |
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if (!is_enforce) error = 0; |
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} |
|
153 |
ccs_free(root_name); |
ccs_free(root_name); |
154 |
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if (error == 1) |
155 |
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goto retry; |
156 |
return error; |
return error; |
157 |
} |
} |
158 |
|
|
159 |
int AddChrootPolicy(char *data, const int is_delete) |
/** |
160 |
|
* ccs_write_chroot_policy - Write "struct chroot_entry" list. |
161 |
|
* |
162 |
|
* @data: String to parse. |
163 |
|
* @is_delete: True if it is a delete request. |
164 |
|
* |
165 |
|
* Returns 0 on success, negative value otherwise. |
166 |
|
*/ |
167 |
|
int ccs_write_chroot_policy(char *data, const bool is_delete) |
168 |
{ |
{ |
169 |
return AddChrootACL(data, is_delete); |
return update_chroot_acl(data, is_delete); |
170 |
} |
} |
171 |
|
|
172 |
int ReadChrootPolicy(IO_BUFFER *head) |
/** |
173 |
|
* ccs_read_chroot_policy - Read "struct chroot_entry" list. |
174 |
|
* |
175 |
|
* @head: Pointer to "struct ccs_io_buffer". |
176 |
|
* |
177 |
|
* Returns true on success, false otherwise. |
178 |
|
*/ |
179 |
|
bool ccs_read_chroot_policy(struct ccs_io_buffer *head) |
180 |
{ |
{ |
181 |
CHROOT_ENTRY *ptr = (CHROOT_ENTRY *) head->read_var2; |
struct list1_head *pos; |
182 |
if (!ptr) ptr = chroot_list; |
list1_for_each_cookie(pos, head->read_var2, &chroot_list) { |
183 |
while (ptr) { |
struct chroot_entry *ptr; |
184 |
head->read_var2 = (void *) ptr; |
ptr = list1_entry(pos, struct chroot_entry, list); |
185 |
if (ptr->is_deleted == 0 && io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", ptr->dir->name)) break; |
if (ptr->is_deleted) |
186 |
ptr = ptr->next; |
continue; |
187 |
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", |
188 |
|
ptr->dir->name)) |
189 |
|
goto out; |
190 |
} |
} |
191 |
return ptr ? -ENOMEM : 0; |
return true; |
192 |
|
out: |
193 |
|
return false; |
194 |
} |
} |
|
|
|
|
EXPORT_SYMBOL(CheckChRootPermission); |
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/***** SAKURA Linux end. *****/ |
|