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 2008/10/07 |
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 |
*/ |
*/ |
|
/***** SAKURA Linux start. *****/ |
|
14 |
|
|
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 |
|
|
24 |
extern const char *ccs_log_level; |
/* Structure for "allow_chroot" keyword. */ |
25 |
|
struct chroot_entry { |
26 |
/***** The structure for chroot restrictions. *****/ |
struct list1_head list; |
|
|
|
|
typedef struct chroot_entry { |
|
|
struct chroot_entry *next; |
|
27 |
const struct path_info *dir; |
const struct path_info *dir; |
28 |
int is_deleted; |
bool is_deleted; |
29 |
} CHROOT_ENTRY; |
}; |
|
|
|
|
/************************* CHROOT RESTRICTION HANDLER *************************/ |
|
30 |
|
|
31 |
static CHROOT_ENTRY *chroot_list = NULL; |
/* The list for "struct chroot_entry". */ |
32 |
|
static LIST1_HEAD(chroot_list); |
33 |
|
|
34 |
static int AddChrootACL(const char *dir, const int is_delete) |
/** |
35 |
|
* update_chroot_acl - Update "struct chroot_entry" list. |
36 |
|
* |
37 |
|
* @dir: The name of directory. |
38 |
|
* @is_delete: True if it is a delete request. |
39 |
|
* |
40 |
|
* Returns 0 on success, negative value otherwise. |
41 |
|
*/ |
42 |
|
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 |
|
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 |
|
ptr->is_deleted = is_delete; |
59 |
|
error = 0; |
60 |
|
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 |
|
if (!new_entry) |
68 |
|
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); |
|
if ((ptr = chroot_list) != NULL) { |
|
|
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
|
|
} else { |
|
|
chroot_list = new_entry; |
|
|
} |
|
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 |
|
ccs_update_counter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
76 |
return error; |
return error; |
77 |
} |
} |
78 |
|
|
79 |
int CheckChRootPermission(struct nameidata *nd) |
/** |
80 |
|
* print_error - Print error message. |
81 |
|
* |
82 |
|
* @r: Pointer to "struct ccs_request_info". |
83 |
|
* @root_name: Requested directory name. |
84 |
|
* |
85 |
|
* Returns 0 if @r->mode is not enforcing mode or permitted by the |
86 |
|
* administrator's decision, negative value otherwise. |
87 |
|
*/ |
88 |
|
static int print_error(struct ccs_request_info *r, const char *root_name) |
89 |
|
{ |
90 |
|
int error; |
91 |
|
const bool is_enforce = (r->mode == 3); |
92 |
|
const char *exename = ccs_get_exe(); |
93 |
|
printk(KERN_WARNING "SAKURA-%s: chroot %s (pid=%d:exe=%s): " |
94 |
|
"Permission denied.\n", ccs_get_msg(is_enforce), |
95 |
|
root_name, current->pid, exename); |
96 |
|
if (is_enforce) |
97 |
|
error = ccs_check_supervisor(r, |
98 |
|
"# %s is requesting\nchroot %s\n", |
99 |
|
exename, root_name); |
100 |
|
else |
101 |
|
error = 0; |
102 |
|
if (exename) |
103 |
|
ccs_free(exename); |
104 |
|
if (r->mode == 1 && root_name) |
105 |
|
update_chroot_acl(root_name, false); |
106 |
|
return error; |
107 |
|
} |
108 |
|
|
109 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) |
110 |
|
#define PATH_or_NAMEIDATA path |
111 |
|
#else |
112 |
|
#define PATH_or_NAMEIDATA nameidata |
113 |
|
#endif |
114 |
|
/** |
115 |
|
* ccs_check_chroot_permission - Check permission for chroot(). |
116 |
|
* |
117 |
|
* @path: Pointer to "struct path" (for 2.6.27 and later). |
118 |
|
* Pointer to "struct nameidata" (for 2.6.26 and earlier). |
119 |
|
* |
120 |
|
* Returns 0 on success, negative value otherwise. |
121 |
|
*/ |
122 |
|
int ccs_check_chroot_permission(struct PATH_or_NAMEIDATA *path) |
123 |
{ |
{ |
124 |
int error = -EPERM; |
struct ccs_request_info r; |
125 |
|
int error; |
126 |
char *root_name; |
char *root_name; |
127 |
if (!CheckCCSFlags(CCS_SAKURA_RESTRICT_CHROOT)) return 0; |
if (!ccs_can_sleep()) |
128 |
root_name = realpath_from_dentry(nd->dentry, nd->mnt); |
return 0; |
129 |
|
ccs_init_request_info(&r, NULL, CCS_SAKURA_RESTRICT_CHROOT); |
130 |
|
if (!r.mode) |
131 |
|
return 0; |
132 |
|
retry: |
133 |
|
error = -EPERM; |
134 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) && LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 26) |
135 |
|
root_name = ccs_realpath_from_dentry(path->path.dentry, path->path.mnt); |
136 |
|
#else |
137 |
|
root_name = ccs_realpath_from_dentry(path->dentry, path->mnt); |
138 |
|
#endif |
139 |
if (root_name) { |
if (root_name) { |
140 |
struct path_info dir; |
struct path_info dir; |
141 |
dir.name = root_name; |
dir.name = root_name; |
142 |
fill_path_info(&dir); |
ccs_fill_path_info(&dir); |
143 |
if (dir.is_dir) { |
if (dir.is_dir) { |
144 |
CHROOT_ENTRY *ptr; |
struct chroot_entry *ptr; |
145 |
for (ptr = chroot_list; ptr; ptr = ptr->next) { |
list1_for_each_entry(ptr, &chroot_list, list) { |
146 |
if (ptr->is_deleted) continue; |
if (ptr->is_deleted) |
147 |
if (PathMatchesToPattern(&dir, ptr->dir)) { |
continue; |
148 |
error = 0; |
if (!ccs_path_matches_pattern(&dir, ptr->dir)) |
149 |
break; |
continue; |
150 |
} |
error = 0; |
151 |
|
break; |
152 |
} |
} |
153 |
} |
} |
154 |
} |
} |
155 |
if (error) { |
if (error) |
156 |
const int is_enforce = CheckCCSEnforce(CCS_SAKURA_RESTRICT_CHROOT); |
error = print_error(&r, root_name); |
|
const char *exename = GetEXE(); |
|
|
printk("SAKURA-%s: chroot %s (pid=%d:exe=%s): Permission denied.\n", GetMSG(is_enforce), root_name, current->pid, exename); |
|
|
if (is_enforce && CheckSupervisor("# %s is requesting\nchroot %s\n", exename, root_name) == 0) error = 0; |
|
|
if (exename) ccs_free(exename); |
|
|
if (!is_enforce && CheckCCSAccept(CCS_SAKURA_RESTRICT_CHROOT) && root_name) { |
|
|
AddChrootACL(root_name, 0); |
|
|
UpdateCounter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
|
|
} |
|
|
if (!is_enforce) error = 0; |
|
|
} |
|
157 |
ccs_free(root_name); |
ccs_free(root_name); |
158 |
|
if (error == 1) { |
159 |
|
r.retry++; |
160 |
|
goto retry; |
161 |
|
} |
162 |
return error; |
return error; |
163 |
} |
} |
164 |
|
|
165 |
int AddChrootPolicy(char *data, const int is_delete) |
/** |
166 |
|
* ccs_write_chroot_policy - Write "struct chroot_entry" list. |
167 |
|
* |
168 |
|
* @data: String to parse. |
169 |
|
* @is_delete: True if it is a delete request. |
170 |
|
* |
171 |
|
* Returns 0 on success, negative value otherwise. |
172 |
|
*/ |
173 |
|
int ccs_write_chroot_policy(char *data, const bool is_delete) |
174 |
{ |
{ |
175 |
return AddChrootACL(data, is_delete); |
return update_chroot_acl(data, is_delete); |
176 |
} |
} |
177 |
|
|
178 |
int ReadChrootPolicy(IO_BUFFER *head) |
/** |
179 |
|
* ccs_read_chroot_policy - Read "struct chroot_entry" list. |
180 |
|
* |
181 |
|
* @head: Pointer to "struct ccs_io_buffer". |
182 |
|
* |
183 |
|
* Returns true on success, false otherwise. |
184 |
|
*/ |
185 |
|
bool ccs_read_chroot_policy(struct ccs_io_buffer *head) |
186 |
{ |
{ |
187 |
CHROOT_ENTRY *ptr = (CHROOT_ENTRY *) head->read_var2; |
struct list1_head *pos; |
188 |
if (!ptr) ptr = chroot_list; |
list1_for_each_cookie(pos, head->read_var2, &chroot_list) { |
189 |
while (ptr) { |
struct chroot_entry *ptr; |
190 |
head->read_var2 = (void *) ptr; |
ptr = list1_entry(pos, struct chroot_entry, list); |
191 |
if (ptr->is_deleted == 0 && io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", ptr->dir->name)) break; |
if (ptr->is_deleted) |
192 |
ptr = ptr->next; |
continue; |
193 |
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", |
194 |
|
ptr->dir->name)) |
195 |
|
goto out; |
196 |
} |
} |
197 |
return ptr ? -ENOMEM : 0; |
return true; |
198 |
|
out: |
199 |
|
return false; |
200 |
} |
} |
|
|
|
|
EXPORT_SYMBOL(CheckChRootPermission); |
|
|
|
|
|
/***** SAKURA Linux end. *****/ |
|