1 |
/* |
/* |
2 |
* fs/tomoyo_domain.c |
* security/ccsecurity/domain.c |
3 |
* |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
5 |
* |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
* Version: 1.7.2+ 2010/06/04 |
|
* |
|
|
* Version: 1.6.5-pre 2008/10/11 |
|
7 |
* |
* |
8 |
* 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. |
9 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
10 |
* |
* |
11 |
*/ |
*/ |
12 |
|
|
13 |
#include <linux/ccs_common.h> |
#include <linux/slab.h> |
|
#include <linux/tomoyo.h> |
|
|
#include <linux/realpath.h> |
|
14 |
#include <linux/highmem.h> |
#include <linux/highmem.h> |
15 |
#include <linux/binfmts.h> |
#include <linux/version.h> |
16 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
17 |
#include <linux/namei.h> |
#include <linux/namei.h> |
18 |
#include <linux/mount.h> |
#include <linux/mount.h> |
19 |
#endif |
#endif |
20 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) |
21 |
/* For compatibility with older kernels. */ |
#include <linux/fs_struct.h> |
|
#ifndef for_each_process |
|
|
#define for_each_process for_each_task |
|
22 |
#endif |
#endif |
23 |
|
#include "internal.h" |
24 |
|
|
25 |
/* Variables definitions.*/ |
/* Variables definitions.*/ |
26 |
|
|
27 |
/* The initial domain. */ |
/* The global domain. */ |
28 |
struct domain_info KERNEL_DOMAIN; |
struct ccs_domain_info ccs_global_domain; |
29 |
|
|
30 |
/* The list for "struct domain_info". */ |
/* The initial domain. */ |
31 |
LIST1_HEAD(domain_list); |
struct ccs_domain_info ccs_kernel_domain; |
32 |
|
|
33 |
#ifdef CONFIG_TOMOYO |
/* The list for "struct ccs_domain_info". */ |
34 |
|
LIST_HEAD(ccs_domain_list); |
35 |
|
|
36 |
/* Domain creation lock. */ |
struct list_head ccs_policy_list[CCS_MAX_POLICY]; |
37 |
static DEFINE_MUTEX(domain_list_lock); |
struct list_head ccs_group_list[CCS_MAX_GROUP]; |
38 |
|
struct list_head ccs_shared_list[CCS_MAX_LIST]; |
|
/* Structure for "initialize_domain" and "no_initialize_domain" keyword. */ |
|
|
struct domain_initializer_entry { |
|
|
struct list1_head list; |
|
|
const struct path_info *domainname; /* This may be NULL */ |
|
|
const struct path_info *program; |
|
|
bool is_deleted; |
|
|
bool is_not; /* True if this entry is "no_initialize_domain". */ |
|
|
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
|
|
}; |
|
|
|
|
|
/* Structure for "keep_domain" and "no_keep_domain" keyword. */ |
|
|
struct domain_keeper_entry { |
|
|
struct list1_head list; |
|
|
const struct path_info *domainname; |
|
|
const struct path_info *program; /* This may be NULL */ |
|
|
bool is_deleted; |
|
|
bool is_not; /* True if this entry is "no_keep_domain". */ |
|
|
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
|
|
}; |
|
|
|
|
|
/* Structure for "aggregator" keyword. */ |
|
|
struct aggregator_entry { |
|
|
struct list1_head list; |
|
|
const struct path_info *original_name; |
|
|
const struct path_info *aggregated_name; |
|
|
bool is_deleted; |
|
|
}; |
|
|
|
|
|
/* Structure for "alias" keyword. */ |
|
|
struct alias_entry { |
|
|
struct list1_head list; |
|
|
const struct path_info *original_name; |
|
|
const struct path_info *aliased_name; |
|
|
bool is_deleted; |
|
|
}; |
|
39 |
|
|
40 |
/** |
/** |
41 |
* ccs_set_domain_flag - Set or clear domain's attribute flags. |
* ccs_audit_execute_handler_log - Audit execute_handler log. |
42 |
* |
* |
43 |
* @domain: Pointer to "struct domain_info". |
* @ee: Pointer to "struct ccs_execve". |
|
* @is_delete: True if it is a delete request. |
|
|
* @flags: Flags to set or clear. |
|
44 |
* |
* |
45 |
* Returns nothing. |
* Returns 0 on success, negative value otherwise. |
46 |
*/ |
*/ |
47 |
void ccs_set_domain_flag(struct domain_info *domain, const bool is_delete, |
static int ccs_audit_execute_handler_log(struct ccs_execve *ee) |
|
const u8 flags) |
|
48 |
{ |
{ |
49 |
/* We need to serialize because this is bitfield operation. */ |
struct ccs_request_info *r = &ee->r; |
50 |
static DEFINE_SPINLOCK(lock); |
const char *handler = ee->handler->name; |
51 |
/***** CRITICAL SECTION START *****/ |
r->type = CCS_MAC_FILE_EXECUTE; |
52 |
spin_lock(&lock); |
r->mode = ccs_get_mode(r->profile, CCS_MAC_FILE_EXECUTE); |
53 |
if (!is_delete) |
r->granted = true; |
54 |
domain->flags |= flags; |
return ccs_write_log(r, "%s %s\n", ee->handler_type == |
55 |
else |
CCS_TYPE_DENIED_EXECUTE_HANDLER ? |
56 |
domain->flags &= ~flags; |
CCS_KEYWORD_DENIED_EXECUTE_HANDLER : |
57 |
spin_unlock(&lock); |
CCS_KEYWORD_EXECUTE_HANDLER, handler); |
|
/***** CRITICAL SECTION END *****/ |
|
58 |
} |
} |
59 |
|
|
60 |
/** |
/** |
61 |
* ccs_get_last_name - Get last component of a domainname. |
* ccs_audit_domain_creation_log - Audit domain creation log. |
|
* |
|
|
* @domain: Pointer to "struct domain_info". |
|
62 |
* |
* |
63 |
* Returns the last component of the domainname. |
* Returns 0 on success, negative value otherwise. |
64 |
*/ |
*/ |
65 |
const char *ccs_get_last_name(const struct domain_info *domain) |
static int ccs_audit_domain_creation_log(void) |
66 |
{ |
{ |
67 |
const char *cp0 = domain->domainname->name; |
struct ccs_request_info r; |
68 |
const char *cp1 = strrchr(cp0, ' '); |
ccs_init_request_info(&r, CCS_MAC_FILE_EXECUTE); |
69 |
if (cp1) |
r.granted = false; |
70 |
return cp1 + 1; |
return ccs_write_log(&r, "use_profile %u\n", r.profile); |
|
return cp0; |
|
71 |
} |
} |
72 |
|
|
73 |
/** |
int ccs_update_policy(struct ccs_acl_head *new_entry, const int size, |
74 |
* ccs_add_domain_acl - Add the given ACL to the given domain. |
bool is_delete, const int idx, bool (*check_duplicate) |
75 |
* |
(const struct ccs_acl_head *, |
76 |
* @domain: Pointer to "struct domain_info". May be NULL. |
const struct ccs_acl_head *)) |
77 |
* @acl: Pointer to "struct acl_info". |
{ |
78 |
* |
int error = is_delete ? -ENOENT : -ENOMEM; |
79 |
* Returns 0. |
struct ccs_acl_head *entry; |
80 |
*/ |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
81 |
int ccs_add_domain_acl(struct domain_info *domain, struct acl_info *acl) |
return -ENOMEM; |
82 |
{ |
list_for_each_entry_rcu(entry, &ccs_policy_list[idx], list) { |
83 |
if (domain) { |
if (!check_duplicate(entry, new_entry)) |
84 |
/* |
continue; |
85 |
* We need to serialize because this function is called by |
entry->is_deleted = is_delete; |
86 |
* various update functions. |
error = 0; |
87 |
*/ |
break; |
|
static DEFINE_SPINLOCK(lock); |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
spin_lock(&lock); |
|
|
list1_add_tail_mb(&acl->list, &domain->acl_info_list); |
|
|
spin_unlock(&lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
} else { |
|
|
acl->type &= ~ACL_DELETED; |
|
88 |
} |
} |
89 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
if (error && !is_delete) { |
90 |
return 0; |
entry = ccs_commit_ok(new_entry, size); |
91 |
|
if (entry) { |
92 |
|
list_add_tail_rcu(&entry->list, &ccs_policy_list[idx]); |
93 |
|
error = 0; |
94 |
|
} |
95 |
|
} |
96 |
|
mutex_unlock(&ccs_policy_lock); |
97 |
|
return error; |
98 |
} |
} |
99 |
|
|
100 |
/** |
int ccs_update_group(struct ccs_acl_head *new_entry, const int size, |
101 |
* ccs_del_domain_acl - Delete the given ACL from the domain. |
bool is_delete, struct ccs_group *group, |
102 |
* |
bool (*check_duplicate) (const struct ccs_acl_head *, |
103 |
* @acl: Pointer to "struct acl_info". May be NULL. |
const struct ccs_acl_head *)) |
104 |
* |
{ |
105 |
* Returns 0. |
int error = is_delete ? -ENOENT : -ENOMEM; |
106 |
*/ |
struct ccs_acl_head *entry; |
107 |
int ccs_del_domain_acl(struct acl_info *acl) |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
108 |
|
return -ENOMEM; |
109 |
|
list_for_each_entry_rcu(entry, &group->member_list, list) { |
110 |
|
if (!check_duplicate(entry, new_entry)) |
111 |
|
continue; |
112 |
|
entry->is_deleted = is_delete; |
113 |
|
error = 0; |
114 |
|
break; |
115 |
|
} |
116 |
|
if (!is_delete && error) { |
117 |
|
entry = ccs_commit_ok(new_entry, size); |
118 |
|
if (entry) { |
119 |
|
list_add_tail_rcu(&entry->list, &group->member_list); |
120 |
|
error = 0; |
121 |
|
} |
122 |
|
} |
123 |
|
mutex_unlock(&ccs_policy_lock); |
124 |
|
return error; |
125 |
|
} |
126 |
|
|
127 |
|
static void ccs_delete_type(struct ccs_domain_info *domain, u8 type) |
128 |
{ |
{ |
129 |
if (acl) |
struct ccs_acl_info *ptr; |
130 |
acl->type |= ACL_DELETED; |
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
131 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
if (ptr->type == type) |
132 |
return 0; |
ptr->is_deleted = true; |
133 |
|
} |
134 |
} |
} |
135 |
|
|
136 |
/** |
int ccs_update_domain(struct ccs_acl_info *new_entry, const int size, |
137 |
* audit_execute_handler_log - Audit execute_handler log. |
bool is_delete, struct ccs_domain_info *domain, |
138 |
* |
bool (*check_duplicate) (const struct ccs_acl_info *, |
139 |
* @is_default: True if it is "execute_handler" log. |
const struct ccs_acl_info *), |
140 |
* @handler: The realpath of the handler. |
bool (*merge_duplicate) (struct ccs_acl_info *, |
141 |
* @bprm: Pointer to "struct linux_binprm". |
struct ccs_acl_info *, |
142 |
* |
const bool)) |
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int audit_execute_handler_log(const bool is_default, |
|
|
const char *handler, |
|
|
struct linux_binprm *bprm) |
|
143 |
{ |
{ |
144 |
struct ccs_request_info r; |
int error = is_delete ? -ENOENT : -ENOMEM; |
145 |
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_FILE); |
struct ccs_acl_info *entry; |
146 |
r.bprm = bprm; |
/* |
147 |
return ccs_write_audit_log(true, &r, "%s %s\n", |
* Only one "execute_handler" and "denied_execute_handler" can exist |
148 |
is_default ? KEYWORD_EXECUTE_HANDLER : |
* in a domain. |
149 |
KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
*/ |
150 |
|
const u8 type = new_entry->type; |
151 |
|
const bool exclusive = !is_delete && |
152 |
|
(type == CCS_TYPE_EXECUTE_HANDLER || |
153 |
|
type == CCS_TYPE_DENIED_EXECUTE_HANDLER); |
154 |
|
if (mutex_lock_interruptible(&ccs_policy_lock)) |
155 |
|
return error; |
156 |
|
list_for_each_entry_rcu(entry, &domain->acl_info_list, list) { |
157 |
|
if (!check_duplicate(entry, new_entry)) |
158 |
|
continue; |
159 |
|
if (exclusive) |
160 |
|
ccs_delete_type(domain, type); |
161 |
|
if (merge_duplicate) |
162 |
|
entry->is_deleted = merge_duplicate(entry, new_entry, |
163 |
|
is_delete); |
164 |
|
else |
165 |
|
entry->is_deleted = is_delete; |
166 |
|
error = 0; |
167 |
|
break; |
168 |
|
} |
169 |
|
if (error && !is_delete) { |
170 |
|
entry = ccs_commit_ok(new_entry, size); |
171 |
|
if (entry) { |
172 |
|
if (exclusive) |
173 |
|
ccs_delete_type(domain, type); |
174 |
|
ccs_add_domain_acl(domain, entry); |
175 |
|
error = 0; |
176 |
|
} |
177 |
|
} |
178 |
|
mutex_unlock(&ccs_policy_lock); |
179 |
|
return error; |
180 |
} |
} |
181 |
|
|
182 |
/** |
void ccs_check_acl(struct ccs_request_info *r, |
183 |
* audit_domain_creation_log - Audit domain creation log. |
bool (*check_entry) (const struct ccs_request_info *, |
184 |
* |
const struct ccs_acl_info *)) |
|
* @domain: Pointer to "struct domain_info". |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int audit_domain_creation_log(struct domain_info *domain) |
|
185 |
{ |
{ |
186 |
struct ccs_request_info r; |
const struct ccs_domain_info *domain = ccs_current_domain(); |
187 |
ccs_init_request_info(&r, domain, CCS_TOMOYO_MAC_FOR_FILE); |
struct ccs_acl_info *ptr; |
188 |
return ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
retry: |
189 |
|
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
190 |
|
if (ptr->is_deleted || ptr->type != r->param_type) |
191 |
|
continue; |
192 |
|
if (check_entry(r, ptr) && ccs_condition(r, ptr->cond)) { |
193 |
|
r->cond = ptr->cond; |
194 |
|
r->granted = true; |
195 |
|
return; |
196 |
|
} |
197 |
|
} |
198 |
|
if (domain != &ccs_global_domain && !domain->ignore_global && |
199 |
|
(r->param_type != CCS_TYPE_PATH_ACL || |
200 |
|
r->param.path.operation != CCS_TYPE_READ || |
201 |
|
!domain->ignore_global_allow_read) && |
202 |
|
(r->param_type != CCS_TYPE_ENV_ACL || |
203 |
|
!domain->ignore_global_allow_env)) { |
204 |
|
domain = &ccs_global_domain; |
205 |
|
goto retry; |
206 |
|
} |
207 |
|
r->granted = false; |
208 |
} |
} |
209 |
|
|
210 |
/* The list for "struct domain_initializer_entry". */ |
static bool ccs_same_domain_initializer_entry(const struct ccs_acl_head *a, |
211 |
static LIST1_HEAD(domain_initializer_list); |
const struct ccs_acl_head *b) |
212 |
|
{ |
213 |
|
const struct ccs_domain_initializer *p1 = container_of(a, typeof(*p1), |
214 |
|
head); |
215 |
|
const struct ccs_domain_initializer *p2 = container_of(b, typeof(*p2), |
216 |
|
head); |
217 |
|
return p1->is_not == p2->is_not && p1->is_last_name == p2->is_last_name |
218 |
|
&& p1->domainname == p2->domainname |
219 |
|
&& p1->program == p2->program; |
220 |
|
} |
221 |
|
|
222 |
/** |
/** |
223 |
* update_domain_initializer_entry - Update "struct domain_initializer_entry" list. |
* ccs_update_domain_initializer_entry - Update "struct ccs_domain_initializer" list. |
224 |
* |
* |
225 |
* @domainname: The name of domain. May be NULL. |
* @domainname: The name of domain. May be NULL. |
226 |
* @program: The name of program. |
* @program: The name of program. |
229 |
* |
* |
230 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
231 |
*/ |
*/ |
232 |
static int update_domain_initializer_entry(const char *domainname, |
static int ccs_update_domain_initializer_entry(const char *domainname, |
233 |
const char *program, |
const char *program, |
234 |
const bool is_not, |
const bool is_not, |
235 |
const bool is_delete) |
const bool is_delete) |
236 |
{ |
{ |
237 |
struct domain_initializer_entry *new_entry; |
struct ccs_domain_initializer e = { .is_not = is_not }; |
238 |
struct domain_initializer_entry *ptr; |
int error = is_delete ? -ENOENT : -ENOMEM; |
239 |
static DEFINE_MUTEX(lock); |
if (!ccs_correct_path(program)) |
240 |
const struct path_info *saved_program; |
return -EINVAL; |
|
const struct path_info *saved_domainname = NULL; |
|
|
int error = -ENOMEM; |
|
|
bool is_last_name = false; |
|
|
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
|
|
return -EINVAL; /* No patterns allowed. */ |
|
241 |
if (domainname) { |
if (domainname) { |
242 |
if (!ccs_is_domain_def(domainname) && |
if (!ccs_domain_def(domainname) && |
243 |
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
ccs_correct_path(domainname)) |
244 |
is_last_name = true; |
e.is_last_name = true; |
245 |
else if (!ccs_is_correct_domain(domainname, __func__)) |
else if (!ccs_correct_domain(domainname)) |
246 |
return -EINVAL; |
return -EINVAL; |
247 |
saved_domainname = ccs_save_name(domainname); |
e.domainname = ccs_get_name(domainname); |
248 |
if (!saved_domainname) |
if (!e.domainname) |
249 |
return -ENOMEM; |
goto out; |
|
} |
|
|
saved_program = ccs_save_name(program); |
|
|
if (!saved_program) |
|
|
return -ENOMEM; |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
|
|
if (ptr->is_not != is_not || |
|
|
ptr->domainname != saved_domainname || |
|
|
ptr->program != saved_program) |
|
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
250 |
} |
} |
251 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
e.program = ccs_get_name(program); |
252 |
if (!new_entry) |
if (!e.program) |
253 |
goto out; |
goto out; |
254 |
new_entry->domainname = saved_domainname; |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
255 |
new_entry->program = saved_program; |
CCS_ID_DOMAIN_INITIALIZER, |
256 |
new_entry->is_not = is_not; |
ccs_same_domain_initializer_entry); |
|
new_entry->is_last_name = is_last_name; |
|
|
list1_add_tail_mb(&new_entry->list, &domain_initializer_list); |
|
|
error = 0; |
|
257 |
out: |
out: |
258 |
mutex_unlock(&lock); |
ccs_put_name(e.domainname); |
259 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
ccs_put_name(e.program); |
260 |
return error; |
return error; |
261 |
} |
} |
262 |
|
|
263 |
/** |
/** |
264 |
* ccs_read_domain_initializer_policy - Read "struct domain_initializer_entry" list. |
* ccs_write_domain_initializer - Write "struct ccs_domain_initializer" list. |
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
struct list1_head *pos; |
|
|
list1_for_each_cookie(pos, head->read_var2, &domain_initializer_list) { |
|
|
const char *no; |
|
|
const char *from = ""; |
|
|
const char *domain = ""; |
|
|
struct domain_initializer_entry *ptr; |
|
|
ptr = list1_entry(pos, struct domain_initializer_entry, list); |
|
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
no = ptr->is_not ? "no_" : ""; |
|
|
if (ptr->domainname) { |
|
|
from = " from "; |
|
|
domain = ptr->domainname->name; |
|
|
} |
|
|
if (!ccs_io_printf(head, |
|
|
"%s" KEYWORD_INITIALIZE_DOMAIN "%s%s%s\n", |
|
|
no, ptr->program->name, from, domain)) |
|
|
goto out; |
|
|
} |
|
|
return true; |
|
|
out: |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_domain_initializer_policy - Write "struct domain_initializer_entry" list. |
|
265 |
* |
* |
266 |
* @data: String to parse. |
* @data: String to parse. |
|
* @is_not: True if it is "no_initialize_domain" entry. |
|
267 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
268 |
* |
* |
269 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
270 |
*/ |
*/ |
271 |
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
int ccs_write_domain_initializer(char *data, const bool is_delete, const u8 flags) |
|
const bool is_delete) |
|
272 |
{ |
{ |
273 |
char *cp = strstr(data, " from "); |
char *domainname = strstr(data, " from "); |
274 |
if (cp) { |
if (domainname) { |
275 |
*cp = '\0'; |
*domainname = '\0'; |
276 |
return update_domain_initializer_entry(cp + 6, data, is_not, |
domainname += 6; |
|
is_delete); |
|
277 |
} |
} |
278 |
return update_domain_initializer_entry(NULL, data, is_not, is_delete); |
return ccs_update_domain_initializer_entry(domainname, data, flags, |
279 |
|
is_delete); |
280 |
} |
} |
281 |
|
|
282 |
/** |
/** |
283 |
* is_domain_initializer - Check whether the given program causes domainname reinitialization. |
* ccs_domain_initializer - Check whether the given program causes domainname reinitialization. |
284 |
* |
* |
285 |
* @domainname: The name of domain. |
* @domainname: The name of domain. |
286 |
* @program: The name of program. |
* @program: The name of program. |
288 |
* |
* |
289 |
* Returns true if executing @program reinitializes domain transition, |
* Returns true if executing @program reinitializes domain transition, |
290 |
* false otherwise. |
* false otherwise. |
291 |
|
* |
292 |
|
* Caller holds ccs_read_lock(). |
293 |
*/ |
*/ |
294 |
static bool is_domain_initializer(const struct path_info *domainname, |
static bool ccs_domain_initializer(const struct ccs_path_info *domainname, |
295 |
const struct path_info *program, |
const struct ccs_path_info *program, |
296 |
const struct path_info *last_name) |
const struct ccs_path_info *last_name) |
297 |
{ |
{ |
298 |
struct domain_initializer_entry *ptr; |
struct ccs_domain_initializer *ptr; |
299 |
bool flag = false; |
bool flag = false; |
300 |
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
list_for_each_entry_rcu(ptr, &ccs_policy_list |
301 |
if (ptr->is_deleted) |
[CCS_ID_DOMAIN_INITIALIZER], head.list) { |
302 |
|
if (ptr->head.is_deleted) |
303 |
continue; |
continue; |
304 |
if (ptr->domainname) { |
if (ptr->domainname) { |
305 |
if (!ptr->is_last_name) { |
if (!ptr->is_last_name) { |
312 |
} |
} |
313 |
if (ccs_pathcmp(ptr->program, program)) |
if (ccs_pathcmp(ptr->program, program)) |
314 |
continue; |
continue; |
315 |
if (ptr->is_not) |
if (ptr->is_not) { |
316 |
return false; |
flag = false; |
317 |
|
break; |
318 |
|
} |
319 |
flag = true; |
flag = true; |
320 |
} |
} |
321 |
return flag; |
return flag; |
322 |
} |
} |
323 |
|
|
324 |
/* The list for "struct domain_keeper_entry". */ |
static bool ccs_same_domain_keeper_entry(const struct ccs_acl_head *a, |
325 |
static LIST1_HEAD(domain_keeper_list); |
const struct ccs_acl_head *b) |
326 |
|
{ |
327 |
|
const struct ccs_domain_keeper *p1 = container_of(a, typeof(*p1), |
328 |
|
head); |
329 |
|
const struct ccs_domain_keeper *p2 = container_of(b, typeof(*p2), |
330 |
|
head); |
331 |
|
return p1->is_not == p2->is_not && p1->is_last_name == p2->is_last_name |
332 |
|
&& p1->domainname == p2->domainname |
333 |
|
&& p1->program == p2->program; |
334 |
|
} |
335 |
|
|
336 |
/** |
/** |
337 |
* update_domain_keeper_entry - Update "struct domain_keeper_entry" list. |
* ccs_update_domain_keeper_entry - Update "struct ccs_domain_keeper" list. |
338 |
* |
* |
339 |
* @domainname: The name of domain. |
* @domainname: The name of domain. |
340 |
* @program: The name of program. May be NULL. |
* @program: The name of program. May be NULL. |
343 |
* |
* |
344 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
345 |
*/ |
*/ |
346 |
static int update_domain_keeper_entry(const char *domainname, |
static int ccs_update_domain_keeper_entry(const char *domainname, |
347 |
const char *program, |
const char *program, |
348 |
const bool is_not, const bool is_delete) |
const bool is_not, |
349 |
{ |
const bool is_delete) |
350 |
struct domain_keeper_entry *new_entry; |
{ |
351 |
struct domain_keeper_entry *ptr; |
struct ccs_domain_keeper e = { .is_not = is_not }; |
352 |
const struct path_info *saved_domainname; |
int error = is_delete ? -ENOENT : -ENOMEM; |
353 |
const struct path_info *saved_program = NULL; |
if (!ccs_domain_def(domainname) && ccs_correct_path(domainname)) |
354 |
static DEFINE_MUTEX(lock); |
e.is_last_name = true; |
355 |
int error = -ENOMEM; |
else if (!ccs_correct_domain(domainname)) |
|
bool is_last_name = false; |
|
|
if (!ccs_is_domain_def(domainname) && |
|
|
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
|
|
is_last_name = true; |
|
|
else if (!ccs_is_correct_domain(domainname, __func__)) |
|
356 |
return -EINVAL; |
return -EINVAL; |
357 |
if (program) { |
if (program) { |
358 |
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
if (!ccs_correct_path(program)) |
359 |
return -EINVAL; |
return -EINVAL; |
360 |
saved_program = ccs_save_name(program); |
e.program = ccs_get_name(program); |
361 |
if (!saved_program) |
if (!e.program) |
362 |
return -ENOMEM; |
goto out; |
|
} |
|
|
saved_domainname = ccs_save_name(domainname); |
|
|
if (!saved_domainname) |
|
|
return -ENOMEM; |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
|
|
if (ptr->is_not != is_not || |
|
|
ptr->domainname != saved_domainname || |
|
|
ptr->program != saved_program) |
|
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
363 |
} |
} |
364 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
e.domainname = ccs_get_name(domainname); |
365 |
if (!new_entry) |
if (!e.domainname) |
366 |
goto out; |
goto out; |
367 |
new_entry->domainname = saved_domainname; |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
368 |
new_entry->program = saved_program; |
CCS_ID_DOMAIN_KEEPER, |
369 |
new_entry->is_not = is_not; |
ccs_same_domain_keeper_entry); |
|
new_entry->is_last_name = is_last_name; |
|
|
list1_add_tail_mb(&new_entry->list, &domain_keeper_list); |
|
|
error = 0; |
|
370 |
out: |
out: |
371 |
mutex_unlock(&lock); |
ccs_put_name(e.domainname); |
372 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
ccs_put_name(e.program); |
373 |
return error; |
return error; |
374 |
} |
} |
375 |
|
|
376 |
/** |
/** |
377 |
* ccs_write_domain_keeper_policy - Write "struct domain_keeper_entry" list. |
* ccs_write_domain_keeper - Write "struct ccs_domain_keeper" list. |
378 |
* |
* |
379 |
* @data: String to parse. |
* @data: String to parse. |
|
* @is_not: True if it is "no_keep_domain" entry. |
|
380 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
381 |
* |
* |
382 |
|
* Returns 0 on success, negative value otherwise. |
383 |
*/ |
*/ |
384 |
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
int ccs_write_domain_keeper(char *data, const bool is_delete, const u8 flags) |
|
const bool is_delete) |
|
|
{ |
|
|
char *cp = strstr(data, " from "); |
|
|
if (cp) { |
|
|
*cp = '\0'; |
|
|
return update_domain_keeper_entry(cp + 6, data, |
|
|
is_not, is_delete); |
|
|
} |
|
|
return update_domain_keeper_entry(data, NULL, is_not, is_delete); |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_domain_keeper_policy - Read "struct domain_keeper_entry" list. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
|
385 |
{ |
{ |
386 |
struct list1_head *pos; |
char *domainname = strstr(data, " from "); |
387 |
list1_for_each_cookie(pos, head->read_var2, &domain_keeper_list) { |
if (domainname) { |
388 |
struct domain_keeper_entry *ptr; |
*domainname = '\0'; |
389 |
const char *no; |
domainname += 6; |
390 |
const char *from = ""; |
} else { |
391 |
const char *program = ""; |
domainname = data; |
392 |
ptr = list1_entry(pos, struct domain_keeper_entry, list); |
data = NULL; |
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
no = ptr->is_not ? "no_" : ""; |
|
|
if (ptr->program) { |
|
|
from = " from "; |
|
|
program = ptr->program->name; |
|
|
} |
|
|
if (!ccs_io_printf(head, |
|
|
"%s" KEYWORD_KEEP_DOMAIN "%s%s%s\n", no, |
|
|
program, from, ptr->domainname->name)) |
|
|
goto out; |
|
393 |
} |
} |
394 |
return true; |
return ccs_update_domain_keeper_entry(domainname, data, flags, |
395 |
out: |
is_delete); |
|
return false; |
|
396 |
} |
} |
397 |
|
|
398 |
/** |
/** |
399 |
* is_domain_keeper - Check whether the given program causes domain transition suppression. |
* ccs_domain_keeper - Check whether the given program causes domain transition suppression. |
400 |
* |
* |
401 |
* @domainname: The name of domain. |
* @domainname: The name of domain. |
402 |
* @program: The name of program. |
* @program: The name of program. |
404 |
* |
* |
405 |
* Returns true if executing @program supresses domain transition, |
* Returns true if executing @program supresses domain transition, |
406 |
* false otherwise. |
* false otherwise. |
407 |
|
* |
408 |
|
* Caller holds ccs_read_lock(). |
409 |
*/ |
*/ |
410 |
static bool is_domain_keeper(const struct path_info *domainname, |
static bool ccs_domain_keeper(const struct ccs_path_info *domainname, |
411 |
const struct path_info *program, |
const struct ccs_path_info *program, |
412 |
const struct path_info *last_name) |
const struct ccs_path_info *last_name) |
413 |
{ |
{ |
414 |
struct domain_keeper_entry *ptr; |
struct ccs_domain_keeper *ptr; |
415 |
bool flag = false; |
bool flag = false; |
416 |
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
list_for_each_entry_rcu(ptr, &ccs_policy_list[CCS_ID_DOMAIN_KEEPER], |
417 |
if (ptr->is_deleted) |
head.list) { |
418 |
|
if (ptr->head.is_deleted) |
419 |
continue; |
continue; |
420 |
if (!ptr->is_last_name) { |
if (!ptr->is_last_name) { |
421 |
if (ptr->domainname != domainname) |
if (ptr->domainname != domainname) |
426 |
} |
} |
427 |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
428 |
continue; |
continue; |
429 |
if (ptr->is_not) |
if (ptr->is_not) { |
430 |
return false; |
flag = false; |
431 |
|
break; |
432 |
|
} |
433 |
flag = true; |
flag = true; |
434 |
} |
} |
435 |
return flag; |
return flag; |
436 |
} |
} |
437 |
|
|
438 |
/* The list for "struct alias_entry". */ |
static bool ccs_same_aggregator_entry(const struct ccs_acl_head *a, |
439 |
static LIST1_HEAD(alias_list); |
const struct ccs_acl_head *b) |
|
|
|
|
/** |
|
|
* update_alias_entry - Update "struct alias_entry" list. |
|
|
* |
|
|
* @original_name: The original program's real name. |
|
|
* @aliased_name: The symbolic program's symbolic link's name. |
|
|
* @is_delete: True if it is a delete request. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
static int update_alias_entry(const char *original_name, |
|
|
const char *aliased_name, |
|
|
const bool is_delete) |
|
|
{ |
|
|
struct alias_entry *new_entry; |
|
|
struct alias_entry *ptr; |
|
|
static DEFINE_MUTEX(lock); |
|
|
const struct path_info *saved_original_name; |
|
|
const struct path_info *saved_aliased_name; |
|
|
int error = -ENOMEM; |
|
|
if (!ccs_is_correct_path(original_name, 1, -1, -1, __func__) || |
|
|
!ccs_is_correct_path(aliased_name, 1, -1, -1, __func__)) |
|
|
return -EINVAL; /* No patterns allowed. */ |
|
|
saved_original_name = ccs_save_name(original_name); |
|
|
saved_aliased_name = ccs_save_name(aliased_name); |
|
|
if (!saved_original_name || !saved_aliased_name) |
|
|
return -ENOMEM; |
|
|
mutex_lock(&lock); |
|
|
list1_for_each_entry(ptr, &alias_list, list) { |
|
|
if (ptr->original_name != saved_original_name || |
|
|
ptr->aliased_name != saved_aliased_name) |
|
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
|
} |
|
|
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
|
|
if (!new_entry) |
|
|
goto out; |
|
|
new_entry->original_name = saved_original_name; |
|
|
new_entry->aliased_name = saved_aliased_name; |
|
|
list1_add_tail_mb(&new_entry->list, &alias_list); |
|
|
error = 0; |
|
|
out: |
|
|
mutex_unlock(&lock); |
|
|
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
|
|
return error; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_read_alias_policy - Read "struct alias_entry" list. |
|
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
bool ccs_read_alias_policy(struct ccs_io_buffer *head) |
|
440 |
{ |
{ |
441 |
struct list1_head *pos; |
const struct ccs_aggregator *p1 = container_of(a, typeof(*p1), head); |
442 |
list1_for_each_cookie(pos, head->read_var2, &alias_list) { |
const struct ccs_aggregator *p2 = container_of(b, typeof(*p2), head); |
443 |
struct alias_entry *ptr; |
return p1->original_name == p2->original_name && |
444 |
ptr = list1_entry(pos, struct alias_entry, list); |
p1->aggregated_name == p2->aggregated_name; |
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
if (!ccs_io_printf(head, KEYWORD_ALIAS "%s %s\n", |
|
|
ptr->original_name->name, |
|
|
ptr->aliased_name->name)) |
|
|
goto out; |
|
|
} |
|
|
return true; |
|
|
out: |
|
|
return false; |
|
445 |
} |
} |
446 |
|
|
447 |
/** |
/** |
448 |
* ccs_write_alias_policy - Write "struct alias_entry" list. |
* ccs_update_aggregator_entry - Update "struct ccs_aggregator" list. |
|
* |
|
|
* @data: String to parse. |
|
|
* @is_delete: True if it is a delete request. |
|
|
* |
|
|
* Returns 0 on success, negative value otherwise. |
|
|
*/ |
|
|
int ccs_write_alias_policy(char *data, const bool is_delete) |
|
|
{ |
|
|
char *cp = strchr(data, ' '); |
|
|
if (!cp) |
|
|
return -EINVAL; |
|
|
*cp++ = '\0'; |
|
|
return update_alias_entry(data, cp, is_delete); |
|
|
} |
|
|
|
|
|
/* The list for "struct aggregator_entry". */ |
|
|
static LIST1_HEAD(aggregator_list); |
|
|
|
|
|
/** |
|
|
* update_aggregator_entry - Update "struct aggregator_entry" list. |
|
449 |
* |
* |
450 |
* @original_name: The original program's name. |
* @original_name: The original program's name. |
451 |
* @aggregated_name: The aggregated program's name. |
* @aggregated_name: The aggregated program's name. |
453 |
* |
* |
454 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
455 |
*/ |
*/ |
456 |
static int update_aggregator_entry(const char *original_name, |
static int ccs_update_aggregator_entry(const char *original_name, |
457 |
const char *aggregated_name, |
const char *aggregated_name, |
458 |
const bool is_delete) |
const bool is_delete) |
459 |
{ |
{ |
460 |
struct aggregator_entry *new_entry; |
struct ccs_aggregator e = { }; |
461 |
struct aggregator_entry *ptr; |
int error = is_delete ? -ENOENT : -ENOMEM; |
462 |
static DEFINE_MUTEX(lock); |
if (!ccs_correct_path(original_name) || |
463 |
const struct path_info *saved_original_name; |
!ccs_correct_path(aggregated_name)) |
|
const struct path_info *saved_aggregated_name; |
|
|
int error = -ENOMEM; |
|
|
if (!ccs_is_correct_path(original_name, 1, 0, -1, __func__) || |
|
|
!ccs_is_correct_path(aggregated_name, 1, -1, -1, __func__)) |
|
464 |
return -EINVAL; |
return -EINVAL; |
465 |
saved_original_name = ccs_save_name(original_name); |
e.original_name = ccs_get_name(original_name); |
466 |
saved_aggregated_name = ccs_save_name(aggregated_name); |
e.aggregated_name = ccs_get_name(aggregated_name); |
467 |
if (!saved_original_name || !saved_aggregated_name) |
if (!e.original_name || !e.aggregated_name || |
468 |
return -ENOMEM; |
e.aggregated_name->is_patterned) /* No patterns allowed. */ |
469 |
mutex_lock(&lock); |
goto out; |
470 |
list1_for_each_entry(ptr, &aggregator_list, list) { |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
471 |
if (ptr->original_name != saved_original_name || |
CCS_ID_AGGREGATOR, |
472 |
ptr->aggregated_name != saved_aggregated_name) |
ccs_same_aggregator_entry); |
|
continue; |
|
|
ptr->is_deleted = is_delete; |
|
|
error = 0; |
|
|
goto out; |
|
|
} |
|
|
if (is_delete) { |
|
|
error = -ENOENT; |
|
|
goto out; |
|
|
} |
|
|
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
|
|
if (!new_entry) |
|
|
goto out; |
|
|
new_entry->original_name = saved_original_name; |
|
|
new_entry->aggregated_name = saved_aggregated_name; |
|
|
list1_add_tail_mb(&new_entry->list, &aggregator_list); |
|
|
error = 0; |
|
473 |
out: |
out: |
474 |
mutex_unlock(&lock); |
ccs_put_name(e.original_name); |
475 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
ccs_put_name(e.aggregated_name); |
476 |
return error; |
return error; |
477 |
} |
} |
478 |
|
|
479 |
/** |
/** |
480 |
* ccs_read_aggregator_policy - Read "struct aggregator_entry" list. |
* ccs_write_aggregator - Write "struct ccs_aggregator" list. |
|
* |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
|
|
{ |
|
|
struct list1_head *pos; |
|
|
list1_for_each_cookie(pos, head->read_var2, &aggregator_list) { |
|
|
struct aggregator_entry *ptr; |
|
|
ptr = list1_entry(pos, struct aggregator_entry, list); |
|
|
if (ptr->is_deleted) |
|
|
continue; |
|
|
if (!ccs_io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", |
|
|
ptr->original_name->name, |
|
|
ptr->aggregated_name->name)) |
|
|
goto out; |
|
|
} |
|
|
return true; |
|
|
out: |
|
|
return false; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_write_aggregator_policy - Write "struct aggregator_entry" list. |
|
481 |
* |
* |
482 |
* @data: String to parse. |
* @data: String to parse. |
483 |
* @is_delete: True if it is a delete request. |
* @is_delete: True if it is a delete request. |
484 |
* |
* |
485 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
486 |
*/ |
*/ |
487 |
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
int ccs_write_aggregator(char *data, const bool is_delete, const u8 flags) |
488 |
{ |
{ |
489 |
char *cp = strchr(data, ' '); |
char *w[2]; |
490 |
if (!cp) |
if (!ccs_tokenize(data, w, sizeof(w)) || !w[1][0]) |
491 |
return -EINVAL; |
return -EINVAL; |
492 |
*cp++ = '\0'; |
return ccs_update_aggregator_entry(w[0], w[1], is_delete); |
|
return update_aggregator_entry(data, cp, is_delete); |
|
493 |
} |
} |
494 |
|
|
495 |
/* Domain create/delete/undelete handler. */ |
/* Domain create/delete handler. */ |
|
|
|
|
/* #define DEBUG_DOMAIN_UNDELETE */ |
|
496 |
|
|
497 |
/** |
/** |
498 |
* ccs_delete_domain - Delete a domain. |
* ccs_delete_domain - Delete a domain. |
503 |
*/ |
*/ |
504 |
int ccs_delete_domain(char *domainname) |
int ccs_delete_domain(char *domainname) |
505 |
{ |
{ |
506 |
struct domain_info *domain; |
struct ccs_domain_info *domain; |
507 |
struct path_info name; |
struct ccs_path_info name; |
508 |
name.name = domainname; |
name.name = domainname; |
509 |
ccs_fill_path_info(&name); |
ccs_fill_path_info(&name); |
510 |
mutex_lock(&domain_list_lock); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
511 |
#ifdef DEBUG_DOMAIN_UNDELETE |
return 0; |
|
printk(KERN_DEBUG "ccs_delete_domain %s\n", domainname); |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
if (ccs_pathcmp(domain->domainname, &name)) |
|
|
continue; |
|
|
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
|
|
} |
|
|
#endif |
|
512 |
/* Is there an active domain? */ |
/* Is there an active domain? */ |
513 |
list1_for_each_entry(domain, &domain_list, list) { |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
514 |
struct domain_info *domain2; |
/* Never delete ccs_kernel_domain */ |
515 |
/* Never delete KERNEL_DOMAIN */ |
if (domain == &ccs_kernel_domain) |
|
if (domain == &KERNEL_DOMAIN) |
|
516 |
continue; |
continue; |
517 |
if (domain->is_deleted || |
if (domain->is_deleted || |
518 |
ccs_pathcmp(domain->domainname, &name)) |
ccs_pathcmp(domain->domainname, &name)) |
519 |
continue; |
continue; |
520 |
/* Mark already deleted domains as non undeletable. */ |
domain->is_deleted = true; |
|
list1_for_each_entry(domain2, &domain_list, list) { |
|
|
if (!domain2->is_deleted || |
|
|
ccs_pathcmp(domain2->domainname, &name)) |
|
|
continue; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
if (domain2->is_deleted != 255) |
|
|
printk(KERN_DEBUG |
|
|
"Marked %p as non undeletable\n", |
|
|
domain2); |
|
|
#endif |
|
|
domain2->is_deleted = 255; |
|
|
} |
|
|
/* Delete and mark active domain as undeletable. */ |
|
|
domain->is_deleted = 1; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "Marked %p as undeletable\n", domain); |
|
|
#endif |
|
521 |
break; |
break; |
522 |
} |
} |
523 |
mutex_unlock(&domain_list_lock); |
mutex_unlock(&ccs_policy_lock); |
524 |
return 0; |
return 0; |
525 |
} |
} |
526 |
|
|
527 |
/** |
/** |
528 |
* ccs_undelete_domain - Undelete a domain. |
* ccs_assign_domain - Create a domain. |
|
* |
|
|
* @domainname: The name of domain. |
|
|
* |
|
|
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
|
|
*/ |
|
|
struct domain_info *ccs_undelete_domain(const char *domainname) |
|
|
{ |
|
|
struct domain_info *domain; |
|
|
struct domain_info *candidate_domain = NULL; |
|
|
struct path_info name; |
|
|
name.name = domainname; |
|
|
ccs_fill_path_info(&name); |
|
|
mutex_lock(&domain_list_lock); |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "ccs_undelete_domain %s\n", domainname); |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
if (ccs_pathcmp(domain->domainname, &name)) |
|
|
continue; |
|
|
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
|
|
} |
|
|
#endif |
|
|
list1_for_each_entry(domain, &domain_list, list) { |
|
|
if (ccs_pathcmp(&name, domain->domainname)) |
|
|
continue; |
|
|
if (!domain->is_deleted) { |
|
|
/* This domain is active. I can't undelete. */ |
|
|
candidate_domain = NULL; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "%p is active. I can't undelete.\n", |
|
|
domain); |
|
|
#endif |
|
|
break; |
|
|
} |
|
|
/* Is this domain undeletable? */ |
|
|
if (domain->is_deleted == 1) |
|
|
candidate_domain = domain; |
|
|
} |
|
|
if (candidate_domain) { |
|
|
candidate_domain->is_deleted = 0; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "%p was undeleted.\n", candidate_domain); |
|
|
#endif |
|
|
} |
|
|
mutex_unlock(&domain_list_lock); |
|
|
return candidate_domain; |
|
|
} |
|
|
|
|
|
/** |
|
|
* ccs_find_or_assign_new_domain - Create a domain. |
|
529 |
* |
* |
530 |
* @domainname: The name of domain. |
* @domainname: The name of domain. |
531 |
* @profile: Profile number to assign if the domain was newly created. |
* @profile: Profile number to assign if the domain was newly created. |
532 |
* |
* |
533 |
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
534 |
*/ |
*/ |
535 |
struct domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
struct ccs_domain_info *ccs_assign_domain(const char *domainname, |
536 |
const u8 profile) |
const u8 profile) |
537 |
{ |
{ |
538 |
struct domain_info *domain = NULL; |
struct ccs_domain_info e = { }; |
539 |
const struct path_info *saved_domainname; |
struct ccs_domain_info *entry = NULL; |
540 |
mutex_lock(&domain_list_lock); |
bool found = false; |
541 |
domain = ccs_find_domain(domainname); |
|
542 |
if (domain) |
if (!ccs_correct_domain(domainname)) |
543 |
goto out; |
return NULL; |
544 |
if (!ccs_is_correct_domain(domainname, __func__)) |
e.profile = profile; |
545 |
goto out; |
e.domainname = ccs_get_name(domainname); |
546 |
saved_domainname = ccs_save_name(domainname); |
if (!e.domainname) |
547 |
if (!saved_domainname) |
return NULL; |
548 |
|
if (mutex_lock_interruptible(&ccs_policy_lock)) |
549 |
goto out; |
goto out; |
550 |
/* Can I reuse memory of deleted domain? */ |
list_for_each_entry_rcu(entry, &ccs_domain_list, list) { |
551 |
list1_for_each_entry(domain, &domain_list, list) { |
if (entry->is_deleted || |
552 |
struct task_struct *p; |
ccs_pathcmp(e.domainname, entry->domainname)) |
|
struct acl_info *ptr; |
|
|
bool flag; |
|
|
if (!domain->is_deleted || |
|
|
domain->domainname != saved_domainname) |
|
553 |
continue; |
continue; |
554 |
flag = false; |
found = true; |
555 |
/***** CRITICAL SECTION START *****/ |
break; |
|
read_lock(&tasklist_lock); |
|
|
for_each_process(p) { |
|
|
if (p->domain_info != domain) |
|
|
continue; |
|
|
flag = true; |
|
|
break; |
|
|
} |
|
|
read_unlock(&tasklist_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (flag) |
|
|
continue; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk(KERN_DEBUG "Reusing %p %s\n", domain, |
|
|
domain->domainname->name); |
|
|
#endif |
|
|
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
|
|
ptr->type |= ACL_DELETED; |
|
|
} |
|
|
ccs_set_domain_flag(domain, true, domain->flags); |
|
|
domain->profile = profile; |
|
|
domain->quota_warned = false; |
|
|
mb(); /* Avoid out-of-order execution. */ |
|
|
domain->is_deleted = 0; |
|
|
goto out; |
|
|
} |
|
|
/* No memory reusable. Create using new memory. */ |
|
|
domain = ccs_alloc_element(sizeof(*domain)); |
|
|
if (domain) { |
|
|
INIT_LIST1_HEAD(&domain->acl_info_list); |
|
|
domain->domainname = saved_domainname; |
|
|
domain->profile = profile; |
|
|
list1_add_tail_mb(&domain->list, &domain_list); |
|
556 |
} |
} |
557 |
out: |
if (!found) { |
558 |
mutex_unlock(&domain_list_lock); |
entry = ccs_commit_ok(&e, sizeof(e)); |
559 |
return domain; |
if (entry) { |
560 |
} |
INIT_LIST_HEAD(&entry->acl_info_list); |
561 |
|
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
562 |
/** |
found = true; |
|
* get_argv0 - Get argv[0]. |
|
|
* |
|
|
* @bprm: Pointer to "struct linux_binprm". |
|
|
* @tmp: Buffer for temporal use. |
|
|
* |
|
|
* Returns true on success, false otherwise. |
|
|
*/ |
|
|
static bool get_argv0(struct linux_binprm *bprm, struct ccs_page_buffer *tmp) |
|
|
{ |
|
|
char *arg_ptr = tmp->buffer; |
|
|
int arg_len = 0; |
|
|
unsigned long pos = bprm->p; |
|
|
int i = pos / PAGE_SIZE; |
|
|
int offset = pos % PAGE_SIZE; |
|
|
bool done = false; |
|
|
if (!bprm->argc) |
|
|
goto out; |
|
|
while (1) { |
|
|
struct page *page; |
|
|
const char *kaddr; |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, |
|
|
NULL) <= 0) |
|
|
goto out; |
|
|
pos += PAGE_SIZE - offset; |
|
|
#else |
|
|
page = bprm->page[i]; |
|
|
#endif |
|
|
/* Map. */ |
|
|
kaddr = kmap(page); |
|
|
if (!kaddr) { /* Mapping failed. */ |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
goto out; |
|
563 |
} |
} |
|
/* Read. */ |
|
|
while (offset < PAGE_SIZE) { |
|
|
const unsigned char c = kaddr[offset++]; |
|
|
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
|
|
if (c == '\\') { |
|
|
arg_ptr[arg_len++] = '\\'; |
|
|
arg_ptr[arg_len++] = '\\'; |
|
|
} else if (c == '/') { |
|
|
arg_len = 0; |
|
|
} else if (c > ' ' && c < 127) { |
|
|
arg_ptr[arg_len++] = c; |
|
|
} else { |
|
|
arg_ptr[arg_len++] = '\\'; |
|
|
arg_ptr[arg_len++] = (c >> 6) + '0'; |
|
|
arg_ptr[arg_len++] |
|
|
= ((c >> 3) & 7) + '0'; |
|
|
arg_ptr[arg_len++] = (c & 7) + '0'; |
|
|
} |
|
|
} else { |
|
|
arg_ptr[arg_len] = '\0'; |
|
|
done = true; |
|
|
break; |
|
|
} |
|
|
} |
|
|
/* Unmap. */ |
|
|
kunmap(page); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
i++; |
|
|
offset = 0; |
|
|
if (done) |
|
|
break; |
|
564 |
} |
} |
565 |
return true; |
mutex_unlock(&ccs_policy_lock); |
566 |
out: |
out: |
567 |
return false; |
ccs_put_name(e.domainname); |
568 |
|
return found ? entry : NULL; |
569 |
} |
} |
570 |
|
|
571 |
/** |
/** |
572 |
* find_next_domain - Find a domain. |
* ccs_find_next_domain - Find a domain. |
573 |
* |
* |
574 |
* @r: Pointer to "struct ccs_request_info". |
* @ee: Pointer to "struct ccs_execve". |
|
* @handler: Pathname to verify. May be NULL. |
|
575 |
* |
* |
576 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
577 |
|
* |
578 |
|
* Caller holds ccs_read_lock(). |
579 |
*/ |
*/ |
580 |
static int find_next_domain(struct ccs_request_info *r, |
static int ccs_find_next_domain(struct ccs_execve *ee) |
|
const struct path_info *handler) |
|
581 |
{ |
{ |
582 |
/* |
struct ccs_request_info *r = &ee->r; |
583 |
* This function assumes that the size of buffer returned by |
const struct ccs_path_info *handler = ee->handler; |
584 |
* ccs_realpath() = CCS_MAX_PATHNAME_LEN. |
struct ccs_domain_info *domain = NULL; |
585 |
*/ |
struct ccs_domain_info * const old_domain = ccs_current_domain(); |
586 |
struct domain_info *domain = NULL; |
const char *old_domain_name = old_domain->domainname->name; |
587 |
const char *old_domain_name = r->domain->domainname->name; |
struct linux_binprm *bprm = ee->bprm; |
588 |
struct linux_binprm *bprm = r->bprm; |
struct task_struct *task = current; |
589 |
struct ccs_page_buffer *tmp = r->obj->tmp; |
const u32 ccs_flags = task->ccs_flags; |
590 |
const char *original_name = bprm->filename; |
struct ccs_path_info rn = { }; /* real name */ |
591 |
const u8 mode = r->mode; |
struct ccs_path_info ln; /* last name */ |
|
const bool is_enforce = (mode == 3); |
|
|
const u32 tomoyo_flags = r->tomoyo_flags; |
|
|
char *new_domain_name = NULL; |
|
|
char *real_program_name = NULL; |
|
|
char *symlink_program_name = NULL; |
|
|
struct path_info rn; /* real name */ |
|
|
struct path_info sn; /* symlink name */ |
|
|
struct path_info ln; /* last name */ |
|
592 |
int retval; |
int retval; |
593 |
|
bool need_kfree = false; |
594 |
{ |
bool domain_created = false; |
595 |
/* |
ln.name = ccs_last_word(old_domain_name); |
596 |
* Built-in initializers. This is needed because policies are |
ccs_fill_path_info(&ln); |
597 |
* not loaded until starting /sbin/init. |
retry: |
598 |
*/ |
current->ccs_flags = ccs_flags; |
599 |
static bool first = true; |
r->cond = NULL; |
600 |
if (first) { |
if (need_kfree) { |
601 |
update_domain_initializer_entry(NULL, "/sbin/hotplug", |
kfree(rn.name); |
602 |
false, false); |
need_kfree = false; |
|
update_domain_initializer_entry(NULL, "/sbin/modprobe", |
|
|
false, false); |
|
|
first = false; |
|
|
} |
|
603 |
} |
} |
604 |
|
|
605 |
retry: |
/* Get symlink's pathname of program. */ |
606 |
current->tomoyo_flags = tomoyo_flags; |
retval = ccs_symlink_path(bprm->filename, &rn); |
607 |
r->tomoyo_flags = tomoyo_flags; |
if (retval < 0) |
|
/* Get ccs_realpath of program. */ |
|
|
retval = -ENOENT; /* I hope ccs_realpath() won't fail with -ENOMEM. */ |
|
|
ccs_free(real_program_name); |
|
|
real_program_name = ccs_realpath(original_name); |
|
|
if (!real_program_name) |
|
|
goto out; |
|
|
/* Get ccs_realpath of symbolic link. */ |
|
|
ccs_free(symlink_program_name); |
|
|
symlink_program_name = ccs_realpath_nofollow(original_name); |
|
|
if (!symlink_program_name) |
|
608 |
goto out; |
goto out; |
609 |
|
need_kfree = true; |
|
rn.name = real_program_name; |
|
|
ccs_fill_path_info(&rn); |
|
|
sn.name = symlink_program_name; |
|
|
ccs_fill_path_info(&sn); |
|
|
ln.name = ccs_get_last_name(r->domain); |
|
|
ccs_fill_path_info(&ln); |
|
610 |
|
|
611 |
if (handler) { |
if (handler) { |
612 |
if (ccs_pathcmp(&rn, handler)) { |
if (ccs_pathcmp(&rn, handler)) { |
619 |
} |
} |
620 |
goto out; |
goto out; |
621 |
} |
} |
622 |
goto calculate_domain; |
} else { |
623 |
} |
struct ccs_aggregator *ptr; |
624 |
|
/* Check 'aggregator' directive. */ |
625 |
/* Check 'alias' directive. */ |
list_for_each_entry_rcu(ptr, |
626 |
if (ccs_pathcmp(&rn, &sn)) { |
&ccs_policy_list[CCS_ID_AGGREGATOR], |
627 |
struct alias_entry *ptr; |
head.list) { |
628 |
/* Is this program allowed to be called via symbolic links? */ |
if (ptr->head.is_deleted || |
|
list1_for_each_entry(ptr, &alias_list, list) { |
|
|
if (ptr->is_deleted || |
|
|
ccs_pathcmp(&rn, ptr->original_name) || |
|
|
ccs_pathcmp(&sn, ptr->aliased_name)) |
|
|
continue; |
|
|
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
|
|
strncpy(real_program_name, ptr->aliased_name->name, |
|
|
CCS_MAX_PATHNAME_LEN - 1); |
|
|
ccs_fill_path_info(&rn); |
|
|
break; |
|
|
} |
|
|
} |
|
|
|
|
|
/* Compare basename of real_program_name and argv[0] */ |
|
|
r->mode = ccs_check_flags(r->domain, CCS_TOMOYO_MAC_FOR_ARGV0); |
|
|
if (bprm->argc > 0 && r->mode) { |
|
|
char *base_argv0 = tmp->buffer; |
|
|
const char *base_filename; |
|
|
retval = -ENOMEM; |
|
|
if (!get_argv0(bprm, tmp)) |
|
|
goto out; |
|
|
base_filename = strrchr(real_program_name, '/'); |
|
|
if (!base_filename) |
|
|
base_filename = real_program_name; |
|
|
else |
|
|
base_filename++; |
|
|
if (strcmp(base_argv0, base_filename)) { |
|
|
retval = ccs_check_argv0_perm(r, &rn, base_argv0); |
|
|
if (retval == 1) { |
|
|
r->retry++; |
|
|
goto retry; |
|
|
} |
|
|
r->retry = 0; |
|
|
r->tomoyo_flags = current->tomoyo_flags; |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
} |
|
|
} |
|
|
|
|
|
/* Check 'aggregator' directive. */ |
|
|
{ |
|
|
struct aggregator_entry *ptr; |
|
|
/* Is this program allowed to be aggregated? */ |
|
|
list1_for_each_entry(ptr, &aggregator_list, list) { |
|
|
if (ptr->is_deleted || |
|
629 |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
630 |
continue; |
continue; |
631 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
kfree(rn.name); |
632 |
strncpy(real_program_name, ptr->aggregated_name->name, |
need_kfree = false; |
633 |
CCS_MAX_PATHNAME_LEN - 1); |
/* This is OK because it is read only. */ |
634 |
ccs_fill_path_info(&rn); |
rn = *ptr->aggregated_name; |
635 |
break; |
break; |
636 |
} |
} |
|
} |
|
637 |
|
|
638 |
/* Check execute permission. */ |
/* Check execute permission. */ |
639 |
r->mode = mode; |
retval = ccs_path_permission(r, CCS_TYPE_EXECUTE, &rn); |
640 |
retval = ccs_check_exec_perm(r, &rn); |
if (retval == CCS_RETRY_REQUEST) |
641 |
if (retval == 1) { |
goto retry; |
642 |
r->retry++; |
if (retval < 0) |
643 |
goto retry; |
goto out; |
644 |
} |
} |
|
r->retry = 0; |
|
|
r->tomoyo_flags = current->tomoyo_flags; |
|
|
if (retval < 0) |
|
|
goto out; |
|
645 |
|
|
646 |
calculate_domain: |
/* Calculate domain to transit to. */ |
647 |
new_domain_name = tmp->buffer; |
if (ccs_domain_initializer(old_domain->domainname, &rn, &ln)) { |
648 |
if (is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
/* Transit to the child of ccs_kernel_domain domain. */ |
649 |
/* Transit to the child of KERNEL_DOMAIN domain. */ |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, CCS_ROOT_NAME " " "%s", |
650 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, |
rn.name); |
651 |
ROOT_NAME " " "%s", real_program_name); |
} else if (old_domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
|
} else if (r->domain == &KERNEL_DOMAIN && !sbin_init_started) { |
|
652 |
/* |
/* |
653 |
* Needn't to transit from kernel domain before starting |
* Needn't to transit from kernel domain before starting |
654 |
* /sbin/init. But transit from kernel domain if executing |
* /sbin/init. But transit from kernel domain if executing |
655 |
* initializers because they might start before /sbin/init. |
* initializers because they might start before /sbin/init. |
656 |
*/ |
*/ |
657 |
domain = r->domain; |
domain = old_domain; |
658 |
} else if (is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
} else if (ccs_domain_keeper(old_domain->domainname, &rn, &ln)) { |
659 |
/* Keep current domain. */ |
/* Keep current domain. */ |
660 |
domain = r->domain; |
domain = old_domain; |
661 |
} else { |
} else { |
662 |
/* Normal domain transition. */ |
/* Normal domain transition. */ |
663 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", |
664 |
"%s %s", old_domain_name, real_program_name); |
old_domain_name, rn.name); |
665 |
} |
} |
666 |
if (domain || strlen(new_domain_name) >= CCS_MAX_PATHNAME_LEN) |
if (domain || strlen(ee->tmp) >= CCS_EXEC_TMPSIZE - 10) |
667 |
goto done; |
goto done; |
668 |
domain = ccs_find_domain(new_domain_name); |
domain = ccs_find_domain(ee->tmp); |
669 |
if (domain) |
if (domain) |
670 |
goto done; |
goto done; |
671 |
if (is_enforce) { |
if (r->mode == CCS_CONFIG_ENFORCING) { |
672 |
int error = ccs_check_supervisor(r, |
int error = ccs_supervisor(r, "# wants to create domain\n" |
673 |
"# wants to create domain\n" |
"%s\n", ee->tmp); |
674 |
"%s\n", new_domain_name); |
if (error == CCS_RETRY_REQUEST) |
|
if (error == 1) { |
|
|
r->retry++; |
|
675 |
goto retry; |
goto retry; |
|
} |
|
|
r->retry = 0; |
|
676 |
if (error < 0) |
if (error < 0) |
677 |
goto done; |
goto done; |
678 |
} |
} |
679 |
domain = ccs_find_or_assign_new_domain(new_domain_name, r->profile); |
domain = ccs_assign_domain(ee->tmp, r->profile); |
680 |
if (domain) |
if (domain) |
681 |
audit_domain_creation_log(domain); |
domain_created = true; |
682 |
done: |
done: |
683 |
if (!domain) { |
if (!domain) { |
684 |
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
retval = (r->mode == CCS_CONFIG_ENFORCING) ? -EPERM : 0; |
685 |
new_domain_name); |
if (!old_domain->domain_transition_failed) { |
686 |
if (is_enforce) |
old_domain->domain_transition_failed = true; |
687 |
retval = -EPERM; |
r->granted = false; |
688 |
else { |
ccs_write_log(r, CCS_KEYWORD_TRANSITION_FAILED "\n"); |
689 |
retval = 0; |
printk(KERN_WARNING |
690 |
ccs_set_domain_flag(r->domain, false, |
"ERROR: Domain '%s' not defined.\n", ee->tmp); |
|
DOMAIN_FLAGS_TRANSITION_FAILED); |
|
691 |
} |
} |
692 |
} else { |
} else { |
693 |
retval = 0; |
retval = 0; |
694 |
} |
} |
695 |
out: |
if (!retval && handler) |
696 |
ccs_free(real_program_name); |
ccs_audit_execute_handler_log(ee); |
697 |
ccs_free(symlink_program_name); |
/* |
698 |
|
* Tell GC that I started execve(). |
699 |
|
* Also, tell open_exec() to check read permission. |
700 |
|
*/ |
701 |
|
task->ccs_flags |= CCS_TASK_IS_IN_EXECVE; |
702 |
|
/* |
703 |
|
* Make task->ccs_flags visible to GC before changing |
704 |
|
* task->ccs_domain_info . |
705 |
|
*/ |
706 |
|
smp_mb(); |
707 |
|
/* |
708 |
|
* Proceed to the next domain in order to allow reaching via PID. |
709 |
|
* It will be reverted if execve() failed. Reverting is not good. |
710 |
|
* But it is better than being unable to reach via PID in interactive |
711 |
|
* enforcing mode. |
712 |
|
*/ |
713 |
if (domain) |
if (domain) |
714 |
r->domain = domain; |
task->ccs_domain_info = domain; |
715 |
|
if (domain_created) |
716 |
|
ccs_audit_domain_creation_log(); |
717 |
|
out: |
718 |
|
if (need_kfree) |
719 |
|
kfree(rn.name); |
720 |
return retval; |
return retval; |
721 |
} |
} |
722 |
|
|
723 |
/** |
/** |
724 |
* check_environ - Check permission for environment variable names. |
* ccs_environ - Check permission for environment variable names. |
725 |
* |
* |
726 |
* @r: Pointer to "struct ccs_request_info". |
* @ee: Pointer to "struct ccs_execve". |
727 |
* |
* |
728 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
729 |
*/ |
*/ |
730 |
static int check_environ(struct ccs_request_info *r) |
static int ccs_environ(struct ccs_execve *ee) |
731 |
{ |
{ |
732 |
struct linux_binprm *bprm = r->bprm; |
struct ccs_request_info *r = &ee->r; |
733 |
struct ccs_page_buffer *tmp = r->obj->tmp; |
struct linux_binprm *bprm = ee->bprm; |
734 |
char *arg_ptr = tmp->buffer; |
/* env_page->data is allocated by ccs_dump_page(). */ |
735 |
|
struct ccs_page_dump env_page = { }; |
736 |
|
char *arg_ptr; /* Size is CCS_EXEC_TMPSIZE bytes */ |
737 |
int arg_len = 0; |
int arg_len = 0; |
738 |
unsigned long pos = bprm->p; |
unsigned long pos = bprm->p; |
|
int i = pos / PAGE_SIZE; |
|
739 |
int offset = pos % PAGE_SIZE; |
int offset = pos % PAGE_SIZE; |
740 |
int argv_count = bprm->argc; |
int argv_count = bprm->argc; |
741 |
int envp_count = bprm->envc; |
int envp_count = bprm->envc; |
742 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
743 |
int error = -ENOMEM; |
int error = -ENOMEM; |
744 |
|
ee->r.type = CCS_MAC_ENVIRON; |
745 |
|
ee->r.mode = ccs_get_mode(ccs_current_domain()->profile, |
746 |
|
CCS_MAC_ENVIRON); |
747 |
if (!r->mode || !envp_count) |
if (!r->mode || !envp_count) |
748 |
return 0; |
return 0; |
749 |
|
arg_ptr = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
750 |
|
if (!arg_ptr) |
751 |
|
goto out; |
752 |
while (error == -ENOMEM) { |
while (error == -ENOMEM) { |
753 |
struct page *page; |
if (!ccs_dump_page(bprm, pos, &env_page)) |
|
const char *kaddr; |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, |
|
|
NULL) <= 0) |
|
754 |
goto out; |
goto out; |
755 |
pos += PAGE_SIZE - offset; |
pos += PAGE_SIZE - offset; |
|
#else |
|
|
page = bprm->page[i]; |
|
|
#endif |
|
|
/* Map. */ |
|
|
kaddr = kmap(page); |
|
|
if (!kaddr) { /* Mapping failed. */ |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
goto out; |
|
|
} |
|
756 |
/* Read. */ |
/* Read. */ |
757 |
while (argv_count && offset < PAGE_SIZE) { |
while (argv_count && offset < PAGE_SIZE) { |
758 |
if (!kaddr[offset++]) |
if (!env_page.data[offset++]) |
759 |
argv_count--; |
argv_count--; |
760 |
} |
} |
761 |
if (argv_count) |
if (argv_count) { |
762 |
goto unmap_page; |
offset = 0; |
763 |
|
continue; |
764 |
|
} |
765 |
while (offset < PAGE_SIZE) { |
while (offset < PAGE_SIZE) { |
766 |
const unsigned char c = kaddr[offset++]; |
const unsigned char c = env_page.data[offset++]; |
767 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
if (c && arg_len < CCS_EXEC_TMPSIZE - 10) { |
768 |
if (c == '=') { |
if (c == '=') { |
769 |
arg_ptr[arg_len++] = '\0'; |
arg_ptr[arg_len++] = '\0'; |
770 |
} else if (c == '\\') { |
} else if (c == '\\') { |
784 |
} |
} |
785 |
if (c) |
if (c) |
786 |
continue; |
continue; |
787 |
if (ccs_check_env_perm(r, arg_ptr)) { |
if (ccs_env_perm(r, arg_ptr)) { |
788 |
error = -EPERM; |
error = -EPERM; |
789 |
break; |
break; |
790 |
} |
} |
794 |
} |
} |
795 |
arg_len = 0; |
arg_len = 0; |
796 |
} |
} |
|
unmap_page: |
|
|
/* Unmap. */ |
|
|
kunmap(page); |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
|
#endif |
|
|
i++; |
|
797 |
offset = 0; |
offset = 0; |
798 |
} |
} |
799 |
out: |
out: |
800 |
if (r->mode != 3) |
if (r->mode != 3) |
801 |
error = 0; |
error = 0; |
802 |
|
kfree(env_page.data); |
803 |
|
kfree(arg_ptr); |
804 |
return error; |
return error; |
805 |
} |
} |
806 |
|
|
807 |
/** |
/** |
808 |
* unescape - Unescape escaped string. |
* ccs_unescape - Unescape escaped string. |
809 |
* |
* |
810 |
* @dest: String to unescape. |
* @dest: String to unescape. |
811 |
* |
* |
812 |
* Returns nothing. |
* Returns nothing. |
813 |
*/ |
*/ |
814 |
static void unescape(unsigned char *dest) |
static void ccs_unescape(unsigned char *dest) |
815 |
{ |
{ |
816 |
unsigned char *src = dest; |
unsigned char *src = dest; |
817 |
unsigned char c; |
unsigned char c; |
818 |
unsigned char d; |
unsigned char d; |
819 |
unsigned char e; |
unsigned char e; |
820 |
while ((c = *src++) != '\0') { |
while (1) { |
821 |
|
c = *src++; |
822 |
|
if (!c) |
823 |
|
break; |
824 |
if (c != '\\') { |
if (c != '\\') { |
825 |
*dest++ = c; |
*dest++ = c; |
826 |
continue; |
continue; |
844 |
} |
} |
845 |
|
|
846 |
/** |
/** |
847 |
* root_depth - Get number of directories to strip. |
* ccs_root_depth - Get number of directories to strip. |
848 |
* |
* |
849 |
* @dentry: Pointer to "struct dentry". |
* @dentry: Pointer to "struct dentry". |
850 |
* @vfsmnt: Pointer to "struct vfsmount". |
* @vfsmnt: Pointer to "struct vfsmount". |
851 |
* |
* |
852 |
* Returns number of directories to strip. |
* Returns number of directories to strip. |
853 |
*/ |
*/ |
854 |
static inline int root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
static int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
855 |
{ |
{ |
856 |
int depth = 0; |
int depth = 0; |
|
/***** CRITICAL SECTION START *****/ |
|
857 |
ccs_realpath_lock(); |
ccs_realpath_lock(); |
858 |
for (;;) { |
for (;;) { |
859 |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
868 |
depth++; |
depth++; |
869 |
} |
} |
870 |
ccs_realpath_unlock(); |
ccs_realpath_unlock(); |
|
/***** CRITICAL SECTION END *****/ |
|
871 |
return depth; |
return depth; |
872 |
} |
} |
873 |
|
|
874 |
/** |
/** |
875 |
* get_root_depth - return the depth of root directory. |
* ccs_get_root_depth - return the depth of root directory. |
876 |
* |
* |
877 |
* Returns number of directories to strip. |
* Returns number of directories to strip. |
878 |
*/ |
*/ |
879 |
static int get_root_depth(void) |
static int ccs_get_root_depth(void) |
880 |
{ |
{ |
881 |
int depth; |
int depth; |
882 |
struct dentry *dentry; |
struct dentry *dentry; |
884 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
885 |
struct path root; |
struct path root; |
886 |
#endif |
#endif |
|
/***** CRITICAL SECTION START *****/ |
|
887 |
read_lock(¤t->fs->lock); |
read_lock(¤t->fs->lock); |
888 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
889 |
root = current->fs->root; |
root = current->fs->root; |
895 |
vfsmnt = mntget(current->fs->rootmnt); |
vfsmnt = mntget(current->fs->rootmnt); |
896 |
#endif |
#endif |
897 |
read_unlock(¤t->fs->lock); |
read_unlock(¤t->fs->lock); |
898 |
/***** CRITICAL SECTION END *****/ |
depth = ccs_root_depth(dentry, vfsmnt); |
|
depth = root_depth(dentry, vfsmnt); |
|
899 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
900 |
path_put(&root); |
path_put(&root); |
901 |
#else |
#else |
906 |
} |
} |
907 |
|
|
908 |
/** |
/** |
909 |
* try_alt_exec - Try to start execute handler. |
* ccs_try_alt_exec - Try to start execute handler. |
910 |
* |
* |
911 |
* @r: Pointer to "struct ccs_request_info". |
* @ee: Pointer to "struct ccs_execve". |
|
* @handler: Pointer to the name of execute handler. |
|
|
* @eh_path: Pointer to pointer to the name of execute handler. |
|
912 |
* |
* |
913 |
* Returns 0 on success, negative value otherwise. |
* Returns 0 on success, negative value otherwise. |
914 |
*/ |
*/ |
915 |
static int try_alt_exec(struct ccs_request_info *r, |
static int ccs_try_alt_exec(struct ccs_execve *ee) |
|
const struct path_info *handler, char **eh_path) |
|
916 |
{ |
{ |
917 |
/* |
/* |
918 |
* Contents of modified bprm. |
* Contents of modified bprm. |
928 |
* modified bprm->argv[0] |
* modified bprm->argv[0] |
929 |
* = the program's name specified by execute_handler |
* = the program's name specified by execute_handler |
930 |
* modified bprm->argv[1] |
* modified bprm->argv[1] |
931 |
* = current->domain_info->domainname->name |
* = ccs_current_domain()->domainname->name |
932 |
* modified bprm->argv[2] |
* modified bprm->argv[2] |
933 |
* = the current process's name |
* = the current process's name |
934 |
* modified bprm->argv[3] |
* modified bprm->argv[3] |
950 |
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
951 |
* = original bprm->envp[bprm->envc - 1] |
* = original bprm->envp[bprm->envc - 1] |
952 |
*/ |
*/ |
953 |
struct linux_binprm *bprm = r->bprm; |
struct linux_binprm *bprm = ee->bprm; |
954 |
struct file *filp; |
struct file *filp; |
955 |
int retval; |
int retval; |
956 |
const int original_argc = bprm->argc; |
const int original_argc = bprm->argc; |
957 |
const int original_envc = bprm->envc; |
const int original_envc = bprm->envc; |
958 |
struct task_struct *task = current; |
struct task_struct *task = current; |
|
char *buffer = r->obj->tmp->buffer; |
|
|
/* Allocate memory for execute handler's pathname. */ |
|
|
char *execute_handler = ccs_alloc(sizeof(struct ccs_page_buffer)); |
|
|
*eh_path = execute_handler; |
|
|
if (!execute_handler) |
|
|
return -ENOMEM; |
|
|
strncpy(execute_handler, handler->name, |
|
|
sizeof(struct ccs_page_buffer) - 1); |
|
|
unescape(execute_handler); |
|
959 |
|
|
960 |
/* Close the requested program's dentry. */ |
/* Close the requested program's dentry. */ |
961 |
|
ee->obj.path1.dentry = NULL; |
962 |
|
ee->obj.path1.mnt = NULL; |
963 |
|
ee->obj.validate_done = false; |
964 |
allow_write_access(bprm->file); |
allow_write_access(bprm->file); |
965 |
fput(bprm->file); |
fput(bprm->file); |
966 |
bprm->file = NULL; |
bprm->file = NULL; |
967 |
|
|
968 |
{ /* Adjust root directory for open_exec(). */ |
/* Invalidate page dump cache. */ |
969 |
int depth = get_root_depth(); |
ee->dump.page = NULL; |
|
char *cp = execute_handler; |
|
|
if (!*cp || *cp != '/') |
|
|
return -ENOENT; |
|
|
while (depth) { |
|
|
cp = strchr(cp + 1, '/'); |
|
|
if (!cp) |
|
|
return -ENOENT; |
|
|
depth--; |
|
|
} |
|
|
memmove(execute_handler, cp, strlen(cp) + 1); |
|
|
} |
|
970 |
|
|
971 |
/* Move envp[] to argv[] */ |
/* Move envp[] to argv[] */ |
972 |
bprm->argc += bprm->envc; |
bprm->argc += bprm->envc; |
974 |
|
|
975 |
/* Set argv[6] */ |
/* Set argv[6] */ |
976 |
{ |
{ |
977 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, "%d", |
char *cp = ee->tmp; |
978 |
original_envc); |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
979 |
retval = copy_strings_kernel(1, &buffer, bprm); |
retval = copy_strings_kernel(1, &cp, bprm); |
980 |
if (retval < 0) |
if (retval < 0) |
981 |
goto out; |
goto out; |
982 |
bprm->argc++; |
bprm->argc++; |
984 |
|
|
985 |
/* Set argv[5] */ |
/* Set argv[5] */ |
986 |
{ |
{ |
987 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, "%d", |
char *cp = ee->tmp; |
988 |
original_argc); |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
989 |
retval = copy_strings_kernel(1, &buffer, bprm); |
retval = copy_strings_kernel(1, &cp, bprm); |
990 |
if (retval < 0) |
if (retval < 0) |
991 |
goto out; |
goto out; |
992 |
bprm->argc++; |
bprm->argc++; |
1002 |
|
|
1003 |
/* Set argv[3] */ |
/* Set argv[3] */ |
1004 |
{ |
{ |
1005 |
const u32 tomoyo_flags = task->tomoyo_flags; |
char *cp = ee->tmp; |
1006 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, |
const u32 ccs_flags = task->ccs_flags; |
1007 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
1008 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
1009 |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
1010 |
"state[1]=%u state[2]=%u", |
"state[1]=%u state[2]=%u", |
1011 |
task->pid, task->uid, task->gid, task->euid, |
(pid_t) ccsecurity_exports.sys_getpid(), |
1012 |
task->egid, task->suid, task->sgid, task->fsuid, |
current_uid(), current_gid(), current_euid(), |
1013 |
task->fsgid, (u8) (tomoyo_flags >> 24), |
current_egid(), current_suid(), current_sgid(), |
1014 |
(u8) (tomoyo_flags >> 16), (u8) (tomoyo_flags >> 8)); |
current_fsuid(), current_fsgid(), |
1015 |
retval = copy_strings_kernel(1, &buffer, bprm); |
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
1016 |
|
(u8) (ccs_flags >> 8)); |
1017 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
1018 |
if (retval < 0) |
if (retval < 0) |
1019 |
goto out; |
goto out; |
1020 |
bprm->argc++; |
bprm->argc++; |
1025 |
char *exe = (char *) ccs_get_exe(); |
char *exe = (char *) ccs_get_exe(); |
1026 |
if (exe) { |
if (exe) { |
1027 |
retval = copy_strings_kernel(1, &exe, bprm); |
retval = copy_strings_kernel(1, &exe, bprm); |
1028 |
ccs_free(exe); |
kfree(exe); |
1029 |
} else { |
} else { |
1030 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, |
exe = ee->tmp; |
1031 |
"<unknown>"); |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<unknown>"); |
1032 |
retval = copy_strings_kernel(1, &buffer, bprm); |
retval = copy_strings_kernel(1, &exe, bprm); |
1033 |
} |
} |
1034 |
if (retval < 0) |
if (retval < 0) |
1035 |
goto out; |
goto out; |
1038 |
|
|
1039 |
/* Set argv[1] */ |
/* Set argv[1] */ |
1040 |
{ |
{ |
1041 |
strncpy(buffer, task->domain_info->domainname->name, |
char *cp = ee->tmp; |
1042 |
sizeof(struct ccs_page_buffer) - 1); |
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s", |
1043 |
retval = copy_strings_kernel(1, &buffer, bprm); |
ccs_current_domain()->domainname->name); |
1044 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
1045 |
if (retval < 0) |
if (retval < 0) |
1046 |
goto out; |
goto out; |
1047 |
bprm->argc++; |
bprm->argc++; |
1049 |
|
|
1050 |
/* Set argv[0] */ |
/* Set argv[0] */ |
1051 |
{ |
{ |
1052 |
retval = copy_strings_kernel(1, &execute_handler, bprm); |
int depth = ccs_get_root_depth(); |
1053 |
|
int len = ee->handler->total_len + 1; |
1054 |
|
char *cp = kmalloc(len, CCS_GFP_FLAGS); |
1055 |
|
if (!cp) { |
1056 |
|
retval = -ENOMEM; |
1057 |
|
goto out; |
1058 |
|
} |
1059 |
|
ee->handler_path = cp; |
1060 |
|
memmove(cp, ee->handler->name, len); |
1061 |
|
ccs_unescape(cp); |
1062 |
|
retval = -ENOENT; |
1063 |
|
if (!*cp || *cp != '/') |
1064 |
|
goto out; |
1065 |
|
/* Adjust root directory for open_exec(). */ |
1066 |
|
while (depth) { |
1067 |
|
cp = strchr(cp + 1, '/'); |
1068 |
|
if (!cp) |
1069 |
|
goto out; |
1070 |
|
depth--; |
1071 |
|
} |
1072 |
|
memmove(ee->handler_path, cp, strlen(cp) + 1); |
1073 |
|
cp = ee->handler_path; |
1074 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
1075 |
if (retval < 0) |
if (retval < 0) |
1076 |
goto out; |
goto out; |
1077 |
bprm->argc++; |
bprm->argc++; |
1082 |
#endif |
#endif |
1083 |
#endif |
#endif |
1084 |
|
|
1085 |
/* OK, now restart the process with execute handler program's dentry. */ |
/* |
1086 |
filp = open_exec(execute_handler); |
* OK, now restart the process with execute handler program's dentry. |
1087 |
|
*/ |
1088 |
|
filp = open_exec(ee->handler_path); |
1089 |
if (IS_ERR(filp)) { |
if (IS_ERR(filp)) { |
1090 |
retval = PTR_ERR(filp); |
retval = PTR_ERR(filp); |
1091 |
goto out; |
goto out; |
1092 |
} |
} |
1093 |
|
ee->obj.path1.dentry = filp->f_dentry; |
1094 |
|
ee->obj.path1.mnt = filp->f_vfsmnt; |
1095 |
bprm->file = filp; |
bprm->file = filp; |
1096 |
bprm->filename = execute_handler; |
bprm->filename = ee->handler_path; |
1097 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1098 |
bprm->interp = execute_handler; |
bprm->interp = bprm->filename; |
1099 |
#endif |
#endif |
1100 |
retval = prepare_binprm(bprm); |
retval = prepare_binprm(bprm); |
1101 |
if (retval < 0) |
if (retval < 0) |
1102 |
goto out; |
goto out; |
1103 |
task->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1104 |
retval = find_next_domain(r, handler); |
retval = ccs_find_next_domain(ee); |
1105 |
task->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1106 |
out: |
out: |
1107 |
return retval; |
return retval; |
1108 |
} |
} |
1109 |
|
|
1110 |
/** |
/** |
1111 |
* find_execute_handler - Find an execute handler. |
* ccs_find_execute_handler - Find an execute handler. |
1112 |
* |
* |
1113 |
|
* @ee: Pointer to "struct ccs_execve". |
1114 |
* @type: Type of execute handler. |
* @type: Type of execute handler. |
1115 |
* |
* |
1116 |
* Returns pointer to "struct path_info" if found, NULL otherwise. |
* Returns true if found, false otherwise. |
1117 |
|
* |
1118 |
|
* Caller holds ccs_read_lock(). |
1119 |
*/ |
*/ |
1120 |
static const struct path_info *find_execute_handler(const u8 type) |
static bool ccs_find_execute_handler(struct ccs_execve *ee, const u8 type) |
1121 |
{ |
{ |
1122 |
struct task_struct *task = current; |
struct ccs_request_info *r = &ee->r; |
1123 |
const struct domain_info *domain = task->domain_info; |
const struct ccs_domain_info *domain = ccs_current_domain(); |
1124 |
struct acl_info *ptr; |
struct ccs_acl_info *ptr; |
1125 |
/* |
/* |
1126 |
* Don't use execute handler if the current process is |
* Don't use execute handler if the current process is |
1127 |
* marked as execute handler to avoid infinite execute handler loop. |
* marked as execute handler to avoid infinite execute handler loop. |
1128 |
*/ |
*/ |
1129 |
if (task->tomoyo_flags & TOMOYO_TASK_IS_EXECUTE_HANDLER) |
if (current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
1130 |
return NULL; |
return false; |
1131 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
retry: |
1132 |
struct execute_handler_record *acl; |
list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { |
1133 |
if (ptr->type != type) |
struct ccs_execute_handler *acl; |
1134 |
continue; |
if (ptr->type != type || !ccs_condition(r, ptr->cond)) |
1135 |
acl = container_of(ptr, struct execute_handler_record, head); |
continue; |
1136 |
return acl->handler; |
acl = container_of(ptr, struct ccs_execute_handler, head); |
1137 |
|
ee->handler = acl->handler; |
1138 |
|
ee->handler_type = type; |
1139 |
|
r->cond = ptr->cond; |
1140 |
|
return true; |
1141 |
|
} |
1142 |
|
if (domain != &ccs_global_domain && !domain->ignore_global) { |
1143 |
|
domain = &ccs_global_domain; |
1144 |
|
goto retry; |
1145 |
} |
} |
1146 |
return NULL; |
return false; |
1147 |
} |
} |
1148 |
|
|
1149 |
/* List of next_domain which is used for checking interpreter's permissions. */ |
#ifdef CONFIG_MMU |
1150 |
struct execve_entry { |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
1151 |
struct list_head list; |
#define CCS_BPRM_MMU |
1152 |
struct task_struct *task; |
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 |
1153 |
struct domain_info *next_domain; |
#define CCS_BPRM_MMU |
1154 |
}; |
#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 |
1155 |
|
#define CCS_BPRM_MMU |
1156 |
static LIST_HEAD(execve_list); |
#endif |
1157 |
static DEFINE_SPINLOCK(execve_list_lock); |
#endif |
1158 |
|
|
1159 |
/** |
/** |
1160 |
* ccs_register_next_domain - Remember next_domain. |
* ccs_dump_page - Dump a page to buffer. |
1161 |
* |
* |
1162 |
* @next_domain: Pointer to "struct domain_info". |
* @bprm: Pointer to "struct linux_binprm". |
1163 |
|
* @pos: Location to dump. |
1164 |
|
* @dump: Poiner to "struct ccs_page_dump". |
1165 |
* |
* |
1166 |
* Returns 0 on success, -ENOMEM otherwise. |
* Returns true on success, false otherwise. |
1167 |
*/ |
*/ |
1168 |
static int ccs_register_next_domain(struct domain_info *next_domain) |
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
1169 |
|
struct ccs_page_dump *dump) |
1170 |
{ |
{ |
1171 |
struct execve_entry *ee = kmalloc(sizeof(*ee), GFP_KERNEL); |
struct page *page; |
1172 |
if (!ee) |
/* dump->data is released by ccs_finish_execve(). */ |
1173 |
return -ENOMEM; |
if (!dump->data) { |
1174 |
ee->task = current; |
dump->data = kzalloc(PAGE_SIZE, CCS_GFP_FLAGS); |
1175 |
ee->next_domain = next_domain; |
if (!dump->data) |
1176 |
/***** CRITICAL SECTION START *****/ |
return false; |
1177 |
spin_lock(&execve_list_lock); |
} |
1178 |
list_add(&ee->list, &execve_list); |
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1179 |
spin_unlock(&execve_list_lock); |
#ifdef CCS_BPRM_MMU |
1180 |
/***** CRITICAL SECTION END *****/ |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1181 |
return 0; |
return false; |
1182 |
|
#else |
1183 |
|
page = bprm->page[pos / PAGE_SIZE]; |
1184 |
|
#endif |
1185 |
|
if (page != dump->page) { |
1186 |
|
const unsigned int offset = pos % PAGE_SIZE; |
1187 |
|
/* |
1188 |
|
* Maybe kmap()/kunmap() should be used here. |
1189 |
|
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
1190 |
|
* So do I. |
1191 |
|
*/ |
1192 |
|
char *kaddr = kmap_atomic(page, KM_USER0); |
1193 |
|
dump->page = page; |
1194 |
|
memcpy(dump->data + offset, kaddr + offset, |
1195 |
|
PAGE_SIZE - offset); |
1196 |
|
kunmap_atomic(kaddr, KM_USER0); |
1197 |
|
} |
1198 |
|
/* Same with put_arg_page(page) in fs/exec.c */ |
1199 |
|
#ifdef CCS_BPRM_MMU |
1200 |
|
put_page(page); |
1201 |
|
#endif |
1202 |
|
return true; |
1203 |
} |
} |
1204 |
|
|
1205 |
/** |
/** |
1206 |
* ccs_fetch_next_domain - Fetch next_domain from the list. |
* ccs_start_execve - Prepare for execve() operation. |
1207 |
* |
* |
1208 |
* Returns pointer to "struct domain_info" which will be used if execve() |
* @bprm: Pointer to "struct linux_binprm". |
1209 |
* succeeds. This function does not return NULL. |
* @eep: Pointer to "struct ccs_execve *". |
1210 |
|
* |
1211 |
|
* Returns 0 on success, negative value otherwise. |
1212 |
*/ |
*/ |
1213 |
struct domain_info *ccs_fetch_next_domain(void) |
static int ccs_start_execve(struct linux_binprm *bprm, |
1214 |
|
struct ccs_execve **eep) |
1215 |
{ |
{ |
1216 |
|
int retval; |
1217 |
struct task_struct *task = current; |
struct task_struct *task = current; |
1218 |
struct domain_info *next_domain = task->domain_info; |
struct ccs_execve *ee; |
1219 |
struct execve_entry *p; |
*eep = NULL; |
1220 |
/***** CRITICAL SECTION START *****/ |
ee = kzalloc(sizeof(*ee), CCS_GFP_FLAGS); |
1221 |
spin_lock(&execve_list_lock); |
if (!ee) |
1222 |
list_for_each_entry(p, &execve_list, list) { |
return -ENOMEM; |
1223 |
if (p->task != task) |
ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); |
1224 |
continue; |
if (!ee->tmp) { |
1225 |
next_domain = p->next_domain; |
kfree(ee); |
1226 |
break; |
return -ENOMEM; |
1227 |
|
} |
1228 |
|
ee->reader_idx = ccs_read_lock(); |
1229 |
|
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1230 |
|
ee->previous_domain = task->ccs_domain_info; |
1231 |
|
/* Clear manager flag. */ |
1232 |
|
task->ccs_flags &= ~CCS_TASK_IS_MANAGER; |
1233 |
|
*eep = ee; |
1234 |
|
ccs_init_request_info(&ee->r, CCS_MAC_FILE_EXECUTE); |
1235 |
|
ee->r.ee = ee; |
1236 |
|
ee->bprm = bprm; |
1237 |
|
ee->r.obj = &ee->obj; |
1238 |
|
ee->obj.path1.dentry = bprm->file->f_dentry; |
1239 |
|
ee->obj.path1.mnt = bprm->file->f_vfsmnt; |
1240 |
|
/* |
1241 |
|
* No need to call ccs_environ() for execute handler because envp[] is |
1242 |
|
* moved to argv[]. |
1243 |
|
*/ |
1244 |
|
if (ccs_find_execute_handler(ee, CCS_TYPE_EXECUTE_HANDLER)) |
1245 |
|
return ccs_try_alt_exec(ee); |
1246 |
|
retval = ccs_find_next_domain(ee); |
1247 |
|
if (retval == -EPERM) { |
1248 |
|
if (ccs_find_execute_handler(ee, |
1249 |
|
CCS_TYPE_DENIED_EXECUTE_HANDLER)) |
1250 |
|
return ccs_try_alt_exec(ee); |
1251 |
} |
} |
1252 |
spin_unlock(&execve_list_lock); |
if (!retval) |
1253 |
/***** CRITICAL SECTION END *****/ |
retval = ccs_environ(ee); |
1254 |
return next_domain; |
return retval; |
1255 |
} |
} |
1256 |
|
|
1257 |
/** |
/** |
1258 |
* ccs_unregister_next_domain - Forget next_domain. |
* ccs_finish_execve - Clean up execve() operation. |
1259 |
|
* |
1260 |
|
* @retval: Return code of an execve() operation. |
1261 |
|
* @ee: Pointer to "struct ccs_execve". |
1262 |
|
* |
1263 |
|
* Caller holds ccs_read_lock(). |
1264 |
*/ |
*/ |
1265 |
static void ccs_unregister_next_domain(void) |
static void ccs_finish_execve(int retval, struct ccs_execve *ee) |
1266 |
{ |
{ |
1267 |
struct task_struct *task = current; |
struct task_struct *task = current; |
1268 |
struct execve_entry *p; |
if (!ee) |
1269 |
struct execve_entry *ee = NULL; |
return; |
1270 |
/***** CRITICAL SECTION START *****/ |
if (retval < 0) { |
1271 |
spin_lock(&execve_list_lock); |
task->ccs_domain_info = ee->previous_domain; |
1272 |
list_for_each_entry(p, &execve_list, list) { |
/* |
1273 |
if (p->task != task) |
* Make task->ccs_domain_info visible to GC before changing |
1274 |
continue; |
* task->ccs_flags . |
1275 |
list_del(&p->list); |
*/ |
1276 |
ee = p; |
smp_mb(); |
1277 |
break; |
} else { |
1278 |
|
/* Mark the current process as execute handler. */ |
1279 |
|
if (ee->handler) |
1280 |
|
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1281 |
|
/* Mark the current process as normal process. */ |
1282 |
|
else |
1283 |
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1284 |
} |
} |
1285 |
spin_unlock(&execve_list_lock); |
/* Tell GC that I finished execve(). */ |
1286 |
/***** CRITICAL SECTION END *****/ |
task->ccs_flags &= ~CCS_TASK_IS_IN_EXECVE; |
1287 |
|
ccs_read_unlock(ee->reader_idx); |
1288 |
|
kfree(ee->handler_path); |
1289 |
|
kfree(ee->tmp); |
1290 |
|
kfree(ee->dump.data); |
1291 |
kfree(ee); |
kfree(ee); |
1292 |
} |
} |
1293 |
|
|
1294 |
/** |
/** |
1295 |
* search_binary_handler_with_transition - Perform domain transition. |
* ccs_may_transit - Check permission and do domain transition without execve(). |
1296 |
* |
* |
1297 |
* @bprm: Pointer to "struct linux_binprm". |
* @domainname: Domainname to transit to. |
1298 |
* @regs: Pointer to "struct pt_regs". |
* @pathname: Pathname to check. |
1299 |
* |
* |
1300 |
* Returns result of search_binary_handler() on success, |
* Returns 0 on success, negative value otherwise. |
1301 |
* negative value otherwise. |
* |
1302 |
|
* Caller holds ccs_read_lock(). |
1303 |
*/ |
*/ |
1304 |
int search_binary_handler_with_transition(struct linux_binprm *bprm, |
int ccs_may_transit(const char *domainname, const char *pathname) |
|
struct pt_regs *regs) |
|
1305 |
{ |
{ |
1306 |
int retval; |
struct ccs_path_info name; |
|
struct task_struct *task = current; |
|
|
const struct path_info *handler; |
|
1307 |
struct ccs_request_info r; |
struct ccs_request_info r; |
1308 |
struct obj_info obj; |
struct ccs_domain_info *domain; |
1309 |
/* |
int error; |
1310 |
* "eh_path" holds path to execute handler program. |
bool domain_created = false; |
1311 |
* Thus, keep valid until search_binary_handler() finishes. |
name.name = pathname; |
1312 |
*/ |
ccs_fill_path_info(&name); |
1313 |
char *eh_path = NULL; |
/* Check allow_transit permission. */ |
1314 |
struct ccs_page_buffer *tmp = ccs_alloc(sizeof(struct ccs_page_buffer)); |
ccs_init_request_info(&r, CCS_MAC_FILE_TRANSIT); |
1315 |
memset(&obj, 0, sizeof(obj)); |
error = ccs_path_permission(&r, CCS_TYPE_TRANSIT, &name); |
1316 |
if (!sbin_init_started) |
if (error) |
1317 |
ccs_load_policy(bprm->filename); |
return error; |
1318 |
if (!tmp) |
/* Check destination domain. */ |
1319 |
return -ENOMEM; |
domain = ccs_find_domain(domainname); |
1320 |
|
if (!domain && r.mode != CCS_CONFIG_ENFORCING && |
1321 |
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_FILE); |
strlen(domainname) < CCS_EXEC_TMPSIZE - 10) { |
1322 |
r.bprm = bprm; |
domain = ccs_assign_domain(domainname, r.profile); |
1323 |
r.obj = &obj; |
if (domain) |
1324 |
obj.path1_dentry = bprm->file->f_dentry; |
domain_created = true; |
|
obj.path1_vfsmnt = bprm->file->f_vfsmnt; |
|
|
obj.tmp = tmp; |
|
|
|
|
|
/* Clear manager flag. */ |
|
|
task->tomoyo_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
|
|
handler = find_execute_handler(TYPE_EXECUTE_HANDLER); |
|
|
if (handler) { |
|
|
retval = try_alt_exec(&r, handler, &eh_path); |
|
|
if (!retval) |
|
|
audit_execute_handler_log(true, handler->name, bprm); |
|
|
goto ok; |
|
|
} |
|
|
retval = find_next_domain(&r, NULL); |
|
|
if (retval != -EPERM) |
|
|
goto ok; |
|
|
handler = find_execute_handler(TYPE_DENIED_EXECUTE_HANDLER); |
|
|
if (handler) { |
|
|
retval = try_alt_exec(&r, handler, &eh_path); |
|
|
if (!retval) |
|
|
audit_execute_handler_log(false, handler->name, bprm); |
|
1325 |
} |
} |
1326 |
ok: |
if (domain) { |
1327 |
if (retval < 0) |
error = 0; |
1328 |
goto out; |
current->ccs_domain_info = domain; |
1329 |
r.mode = ccs_check_flags(r.domain, CCS_TOMOYO_MAC_FOR_ENV); |
if (domain_created) |
1330 |
retval = check_environ(&r); |
ccs_audit_domain_creation_log(); |
1331 |
if (retval < 0) |
} else { |
1332 |
goto out; |
error = -ENOENT; |
1333 |
retval = ccs_register_next_domain(r.domain); |
} |
1334 |
if (retval < 0) |
return error; |
|
goto out; |
|
|
task->tomoyo_flags |= TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
|
|
retval = search_binary_handler(bprm, regs); |
|
|
task->tomoyo_flags &= ~TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
|
|
if (retval < 0) |
|
|
goto out; |
|
|
/* Proceed to next domain if execution suceeded. */ |
|
|
task->domain_info = r.domain; |
|
|
mb(); /* Make domain transition visible to other CPUs. */ |
|
|
/* Mark the current process as execute handler. */ |
|
|
if (handler) |
|
|
task->tomoyo_flags |= TOMOYO_TASK_IS_EXECUTE_HANDLER; |
|
|
/* Mark the current process as normal process. */ |
|
|
else |
|
|
task->tomoyo_flags &= ~TOMOYO_TASK_IS_EXECUTE_HANDLER; |
|
|
out: |
|
|
ccs_unregister_next_domain(); |
|
|
ccs_free(eh_path); |
|
|
ccs_free(tmp); |
|
|
return retval; |
|
1335 |
} |
} |
1336 |
|
|
1337 |
#else |
static int __ccs_search_binary_handler(struct linux_binprm *bprm, |
1338 |
|
struct pt_regs *regs) |
|
/** |
|
|
* search_binary_handler_with_transition - Wrapper for search_binary_handler(). |
|
|
* |
|
|
* @bprm: Pointer to "struct linux_binprm". |
|
|
* @regs: Pointer to "struct pt_regs". |
|
|
* |
|
|
* Returns the result of search_binary_handler(). |
|
|
*/ |
|
|
int search_binary_handler_with_transition(struct linux_binprm *bprm, |
|
|
struct pt_regs *regs) |
|
1339 |
{ |
{ |
1340 |
#ifdef CONFIG_SAKURA |
struct ccs_execve *ee; |
1341 |
/* Clear manager flag. */ |
int retval; |
1342 |
current->tomoyo_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
if (!ccs_policy_loaded) |
1343 |
ccs_load_policy(bprm->filename); |
ccsecurity_exports.load_policy(bprm->filename); |
1344 |
#endif |
retval = ccs_start_execve(bprm, &ee); |
1345 |
return search_binary_handler(bprm, regs); |
if (!retval) |
1346 |
|
retval = search_binary_handler(bprm, regs); |
1347 |
|
ccs_finish_execve(retval, ee); |
1348 |
|
return retval; |
1349 |
} |
} |
1350 |
|
|
1351 |
#endif |
void __init ccs_domain_init(void) |
1352 |
|
{ |
1353 |
|
ccsecurity_ops.search_binary_handler = __ccs_search_binary_handler; |
1354 |
|
} |