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: 1.5.2-pre 2007/11/27 |
* Version: 1.6.0 2008/04/01 |
9 |
* |
* |
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* 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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#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> |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
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#include <linux/namei.h> |
#include <linux/namei.h> |
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#else |
#else |
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#include <linux/fs.h> |
#include <linux/fs.h> |
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#endif |
#endif |
23 |
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extern const char *ccs_log_level; |
/* Structure for "allow_chroot" keyword. */ |
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/***** The structure for chroot restrictions. *****/ |
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struct chroot_entry { |
struct chroot_entry { |
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struct list1_head list; |
struct list1_head list; |
27 |
const struct path_info *dir; |
const struct path_info *dir; |
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bool is_deleted; |
bool is_deleted; |
29 |
}; |
}; |
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/************************* CHROOT RESTRICTION HANDLER *************************/ |
/* The list for "struct chroot_entry". */ |
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static LIST1_HEAD(chroot_list); |
static LIST1_HEAD(chroot_list); |
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static int AddChrootACL(const char *dir, const bool is_delete) |
/** |
35 |
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* update_chroot_acl - Update "struct chroot_entry" list. |
36 |
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* |
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* @dir: The name of directory. |
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* @is_delete: True if it is a delete request. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int update_chroot_acl(const char *dir, const bool is_delete) |
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{ |
{ |
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struct chroot_entry *new_entry, *ptr; |
struct chroot_entry *new_entry; |
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struct chroot_entry *ptr; |
46 |
const struct path_info *saved_dir; |
const struct path_info *saved_dir; |
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static DEFINE_MUTEX(lock); |
static DEFINE_MUTEX(lock); |
48 |
int error = -ENOMEM; |
int error = -ENOMEM; |
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if (!IsCorrectPath(dir, 1, 0, 1, __FUNCTION__)) return -EINVAL; |
if (!ccs_is_correct_path(dir, 1, 0, 1, __func__)) |
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if ((saved_dir = SaveName(dir)) == NULL) return -ENOMEM; |
return -EINVAL; |
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saved_dir = ccs_save_name(dir); |
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if (!saved_dir) |
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return -ENOMEM; |
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mutex_lock(&lock); |
mutex_lock(&lock); |
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list1_for_each_entry(ptr, &chroot_list, list) { |
list1_for_each_entry(ptr, &chroot_list, list) { |
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if (ptr->dir == saved_dir) { |
if (ptr->dir != saved_dir) |
57 |
ptr->is_deleted = is_delete; |
continue; |
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error = 0; |
ptr->is_deleted = is_delete; |
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goto out; |
error = 0; |
60 |
} |
goto out; |
61 |
} |
} |
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if (is_delete) { |
if (is_delete) { |
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error = -ENOENT; |
error = -ENOENT; |
64 |
goto out; |
goto out; |
65 |
} |
} |
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if ((new_entry = alloc_element(sizeof(*new_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; |
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new_entry->dir = saved_dir; |
new_entry->dir = saved_dir; |
70 |
list1_add_tail_mb(&new_entry->list, &chroot_list); |
list1_add_tail_mb(&new_entry->list, &chroot_list); |
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error = 0; |
error = 0; |
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printk("%sAllow chroot() to %s\n", ccs_log_level, dir); |
printk(KERN_CONT "%sAllow chroot() to %s\n", ccs_log_level, dir); |
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out: |
out: |
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mutex_unlock(&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 |
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{ |
90 |
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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("# %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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/** |
109 |
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* ccs_check_chroot_permission - Check permission for chroot(). |
110 |
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* |
111 |
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* @nd: Pointer to "struct nameidata". |
112 |
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* |
113 |
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* Returns 0 on success, negative value otherwise. |
114 |
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*/ |
115 |
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int ccs_check_chroot_permission(struct nameidata *nd) |
116 |
{ |
{ |
117 |
int error = -EPERM; |
int error = -EPERM; |
118 |
char *root_name; |
char *root_name; |
119 |
if (!CheckCCSFlags(CCS_SAKURA_RESTRICT_CHROOT)) return 0; |
const u8 mode = ccs_check_flags(CCS_SAKURA_RESTRICT_CHROOT); |
120 |
root_name = realpath_from_dentry(nd->dentry, nd->mnt); |
if (!mode) |
121 |
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return 0; |
122 |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
123 |
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root_name = ccs_realpath_from_dentry(nd->path.dentry, nd->path.mnt); |
124 |
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#else |
125 |
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root_name = ccs_realpath_from_dentry(nd->dentry, nd->mnt); |
126 |
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#endif |
127 |
if (root_name) { |
if (root_name) { |
128 |
struct path_info dir; |
struct path_info dir; |
129 |
dir.name = root_name; |
dir.name = root_name; |
130 |
fill_path_info(&dir); |
ccs_fill_path_info(&dir); |
131 |
if (dir.is_dir) { |
if (dir.is_dir) { |
132 |
struct chroot_entry *ptr; |
struct chroot_entry *ptr; |
133 |
list1_for_each_entry(ptr, &chroot_list, list) { |
list1_for_each_entry(ptr, &chroot_list, list) { |
134 |
if (ptr->is_deleted) continue; |
if (ptr->is_deleted) |
135 |
if (PathMatchesToPattern(&dir, ptr->dir)) { |
continue; |
136 |
error = 0; |
if (!ccs_path_matches_pattern(&dir, ptr->dir)) |
137 |
break; |
continue; |
138 |
} |
error = 0; |
139 |
|
break; |
140 |
} |
} |
141 |
} |
} |
142 |
} |
} |
143 |
if (error) { |
if (error) |
144 |
const bool 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, NULL) && 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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} |
|
145 |
ccs_free(root_name); |
ccs_free(root_name); |
146 |
return error; |
return error; |
147 |
} |
} |
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EXPORT_SYMBOL(CheckChRootPermission); |
|
148 |
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|
149 |
int AddChrootPolicy(char *data, const bool is_delete) |
/** |
150 |
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* ccs_write_chroot_policy - Write "struct chroot_entry" list. |
151 |
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* |
152 |
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* @data: String to parse. |
153 |
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* @is_delete: True if it is a delete request. |
154 |
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* |
155 |
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* Returns 0 on success, negative value otherwise. |
156 |
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*/ |
157 |
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int ccs_write_chroot_policy(char *data, const bool is_delete) |
158 |
{ |
{ |
159 |
return AddChrootACL(data, is_delete); |
return update_chroot_acl(data, is_delete); |
160 |
} |
} |
161 |
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162 |
int ReadChrootPolicy(struct io_buffer *head) |
/** |
163 |
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* ccs_read_chroot_policy - Read "struct chroot_entry" list. |
164 |
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* |
165 |
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* @head: Pointer to "struct ccs_io_buffer". |
166 |
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* |
167 |
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* Returns true on success, false otherwise. |
168 |
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*/ |
169 |
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bool ccs_read_chroot_policy(struct ccs_io_buffer *head) |
170 |
{ |
{ |
171 |
struct list1_head *pos; |
struct list1_head *pos; |
172 |
list1_for_each_cookie(pos, head->read_var2, &chroot_list) { |
list1_for_each_cookie(pos, head->read_var2, &chroot_list) { |
173 |
struct chroot_entry *ptr; |
struct chroot_entry *ptr; |
174 |
ptr = list1_entry(pos, struct chroot_entry, list); |
ptr = list1_entry(pos, struct chroot_entry, list); |
175 |
if (ptr->is_deleted) continue; |
if (ptr->is_deleted) |
176 |
if (io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", ptr->dir->name)) return -ENOMEM; |
continue; |
177 |
|
if (!ccs_io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", |
178 |
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ptr->dir->name)) |
179 |
|
goto out; |
180 |
} |
} |
181 |
return 0; |
return true; |
182 |
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out: |
183 |
|
return false; |
184 |
} |
} |
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/***** SAKURA Linux end. *****/ |
|