3 |
* |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
* |
* |
6 |
* Copyright (C) 2005-2007 NTT DATA CORPORATION |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
7 |
* |
* |
8 |
* Version: 1.5.0-pre 2007/08/06 |
* Version: 1.7.0-pre 2009/05/28 |
9 |
* |
* |
10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
12 |
* |
* |
13 |
*/ |
*/ |
|
/***** TOMOYO Linux start. *****/ |
|
14 |
|
|
15 |
#include <linux/ccs_common.h> |
#include <linux/ccs_common.h> |
16 |
#include <linux/tomoyo.h> |
#include <linux/tomoyo.h> |
17 |
#include <linux/realpath.h> |
#include <linux/realpath.h> |
18 |
#include <linux/highmem.h> |
#include <linux/highmem.h> |
19 |
#include <linux/binfmts.h> |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
20 |
|
#include <linux/namei.h> |
21 |
|
#include <linux/mount.h> |
22 |
|
#endif |
23 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) |
24 |
|
#include <linux/fs_struct.h> |
25 |
|
#endif |
26 |
|
|
27 |
|
/* For compatibility with older kernels. */ |
28 |
#ifndef for_each_process |
#ifndef for_each_process |
29 |
#define for_each_process for_each_task |
#define for_each_process for_each_task |
30 |
#endif |
#endif |
31 |
|
|
32 |
/************************* VARIABLES *************************/ |
/* Variables definitions.*/ |
33 |
|
|
34 |
/* The initial domain. */ |
/* The initial domain. */ |
35 |
struct domain_info KERNEL_DOMAIN = { NULL, NULL, NULL, 0, 0, 0 }; |
struct ccs_domain_info ccs_kernel_domain; |
|
|
|
|
/* /sbin/init started? */ |
|
|
extern int sbin_init_started; |
|
|
|
|
|
#ifdef CONFIG_TOMOYO |
|
|
|
|
|
/* Lock for appending domain's ACL. */ |
|
|
DECLARE_MUTEX(domain_acl_lock); |
|
|
|
|
|
/************************* UTILITY FUNCTIONS *************************/ |
|
|
|
|
|
/***** The structure for program files to force domain reconstruction. *****/ |
|
|
|
|
|
struct domain_initializer_entry { |
|
|
struct domain_initializer_entry *next; |
|
|
const struct path_info *domainname; /* This may be NULL */ |
|
|
const struct path_info *program; |
|
|
u8 is_deleted; |
|
|
u8 is_not; |
|
|
u8 is_last_name; |
|
|
u8 is_oldstyle; |
|
|
}; |
|
|
|
|
|
/***** The structure for domains to not to transit domains. *****/ |
|
|
|
|
|
struct domain_keeper_entry { |
|
|
struct domain_keeper_entry *next; |
|
|
const struct path_info *domainname; |
|
|
const struct path_info *program; /* This may be NULL */ |
|
|
u8 is_deleted; |
|
|
u8 is_not; |
|
|
u8 is_last_name; |
|
|
}; |
|
|
|
|
|
/***** The structure for program files that should be aggregated. *****/ |
|
|
|
|
|
struct aggregator_entry { |
|
|
struct aggregator_entry *next; |
|
|
const struct path_info *original_name; |
|
|
const struct path_info *aggregated_name; |
|
|
int is_deleted; |
|
|
}; |
|
|
|
|
|
/***** The structure for program files that should be aliased. *****/ |
|
36 |
|
|
37 |
struct alias_entry { |
/* The list for "struct ccs_domain_info". */ |
38 |
struct alias_entry *next; |
LIST_HEAD(ccs_domain_list); |
|
const struct path_info *original_name; |
|
|
const struct path_info *aliased_name; |
|
|
int is_deleted; |
|
|
}; |
|
39 |
|
|
40 |
/************************* VARIABLES *************************/ |
/** |
41 |
|
* ccs_get_last_name - Get last component of a domainname. |
42 |
/* Domain creation lock. */ |
* |
43 |
static DECLARE_MUTEX(new_domain_assign_lock); |
* @domain: Pointer to "struct ccs_domain_info". |
44 |
|
* |
45 |
/************************* UTILITY FUNCTIONS *************************/ |
* Returns the last component of the domainname. |
46 |
|
*/ |
47 |
int IsDomainDef(const unsigned char *buffer) |
const char *ccs_get_last_name(const struct ccs_domain_info *domain) |
|
{ |
|
|
/* while (*buffer && (*buffer <= ' ' || *buffer >= 127)) buffer++; */ |
|
|
return strncmp(buffer, ROOT_NAME, ROOT_NAME_LEN) == 0; |
|
|
} |
|
|
|
|
|
const char *GetLastName(const struct domain_info *domain) |
|
48 |
{ |
{ |
49 |
const char *cp0 = domain->domainname->name, *cp1; |
const char *cp0 = domain->domainname->name; |
50 |
if ((cp1 = strrchr(cp0, ' ')) != NULL) return cp1 + 1; |
const char *cp1 = strrchr(cp0, ' '); |
51 |
|
if (cp1) |
52 |
|
return cp1 + 1; |
53 |
return cp0; |
return cp0; |
54 |
} |
} |
55 |
|
|
56 |
int ReadSelfDomain(struct io_buffer *head) |
/** |
57 |
|
* ccs_add_domain_acl - Add the given ACL to the given domain. |
58 |
|
* |
59 |
|
* @domain: Pointer to "struct ccs_domain_info". May be NULL. |
60 |
|
* @acl: Pointer to "struct ccs_acl_info". |
61 |
|
* |
62 |
|
* Returns 0. |
63 |
|
*/ |
64 |
|
int ccs_add_domain_acl(struct ccs_domain_info *domain, struct ccs_acl_info *acl) |
65 |
{ |
{ |
66 |
if (!head->read_eof) { |
if (domain) { |
67 |
io_printf(head, "%s", current->domain_info->domainname->name); |
if (acl->cond) |
68 |
head->read_eof = 1; |
atomic_inc(&acl->cond->users); |
69 |
|
list_add_tail_rcu(&acl->list, &domain->acl_info_list); |
70 |
|
} else { |
71 |
|
acl->type &= ~ACL_DELETED; |
72 |
} |
} |
73 |
return 0; |
return 0; |
74 |
} |
} |
75 |
|
|
76 |
int AddDomainACL(struct acl_info *ptr, struct domain_info *domain, struct acl_info *new_ptr) |
/** |
77 |
|
* ccs_del_domain_acl - Delete the given ACL from the domain. |
78 |
|
* |
79 |
|
* @acl: Pointer to "struct ccs_acl_info". May be NULL. |
80 |
|
* |
81 |
|
* Returns 0. |
82 |
|
*/ |
83 |
|
int ccs_del_domain_acl(struct ccs_acl_info *acl) |
84 |
{ |
{ |
85 |
mb(); /* Instead of using spinlock. */ |
if (acl) |
86 |
if (!ptr) domain->first_acl_ptr = (struct acl_info *) new_ptr; |
acl->type |= ACL_DELETED; |
|
else ptr->next = (struct acl_info *) new_ptr; |
|
|
UpdateCounter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
|
87 |
return 0; |
return 0; |
88 |
} |
} |
89 |
|
|
90 |
int DelDomainACL(struct acl_info *ptr) |
/** |
91 |
|
* ccs_audit_execute_handler_log - Audit execute_handler log. |
92 |
|
* |
93 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
94 |
|
* @is_default: True if it is "execute_handler" log. |
95 |
|
* |
96 |
|
* Returns 0 on success, negative value otherwise. |
97 |
|
*/ |
98 |
|
static int ccs_audit_execute_handler_log(struct ccs_execve_entry *ee, |
99 |
|
const bool is_default) |
100 |
{ |
{ |
101 |
ptr->is_deleted = 1; |
struct ccs_request_info *r = &ee->r; |
102 |
UpdateCounter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
const char *handler = ee->handler->name; |
103 |
return 0; |
r->mode = ccs_check_flags(r->domain, CCS_MAC_FOR_FILE); |
104 |
|
return ccs_write_audit_log(true, r, "%s %s\n", |
105 |
|
is_default ? KEYWORD_EXECUTE_HANDLER : |
106 |
|
KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
107 |
} |
} |
108 |
|
|
109 |
int TooManyDomainACL(struct domain_info * const domain) { |
/** |
110 |
unsigned int count = 0; |
* ccs_audit_domain_creation_log - Audit domain creation log. |
111 |
struct acl_info *ptr; |
* |
112 |
for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) { |
* @domain: Pointer to "struct ccs_domain_info". |
113 |
if (!ptr->is_deleted) count++; |
* |
114 |
} |
* Returns 0 on success, negative value otherwise. |
115 |
/* If there are so many entries, don't append if learning mode. */ |
*/ |
116 |
if (count < CheckCCSFlags(CCS_TOMOYO_MAX_ACCEPT_ENTRY)) return 0; |
static int ccs_audit_domain_creation_log(struct ccs_domain_info *domain) |
117 |
if (!domain->quota_warned) { |
{ |
118 |
printk("TOMOYO-WARNING: Domain '%s' has so many ACLs to hold. Stopped learning mode.\n", domain->domainname->name); |
int error; |
119 |
domain->quota_warned = 1; |
struct ccs_request_info r; |
120 |
} |
ccs_init_request_info(&r, domain, CCS_MAC_FOR_FILE); |
121 |
return 1; |
error = ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
122 |
|
return error; |
123 |
} |
} |
124 |
|
|
125 |
|
/* The list for "struct ccs_domain_initializer_entry". */ |
126 |
|
LIST_HEAD(ccs_domain_initializer_list); |
127 |
|
|
128 |
/************************* DOMAIN INITIALIZER HANDLER *************************/ |
/** |
129 |
|
* ccs_update_domain_initializer_entry - Update "struct ccs_domain_initializer_entry" list. |
130 |
static struct domain_initializer_entry *domain_initializer_list = NULL; |
* |
131 |
|
* @domainname: The name of domain. May be NULL. |
132 |
static int AddDomainInitializerEntry(const char *domainname, const char *program, const int is_not, const int is_delete, const int is_oldstyle) |
* @program: The name of program. |
133 |
{ |
* @is_not: True if it is "no_initialize_domain" entry. |
134 |
struct domain_initializer_entry *new_entry, *ptr; |
* @is_delete: True if it is a delete request. |
135 |
static DECLARE_MUTEX(lock); |
* |
136 |
const struct path_info *saved_program, *saved_domainname = NULL; |
* Returns 0 on success, negative value otherwise. |
137 |
int error = -ENOMEM; |
*/ |
138 |
int is_last_name = 0; |
static int ccs_update_domain_initializer_entry(const char *domainname, |
139 |
if (!IsCorrectPath(program, 1, -1, -1, __FUNCTION__)) return -EINVAL; /* No patterns allowed. */ |
const char *program, |
140 |
|
const bool is_not, |
141 |
|
const bool is_delete) |
142 |
|
{ |
143 |
|
struct ccs_domain_initializer_entry *entry = NULL; |
144 |
|
struct ccs_domain_initializer_entry *ptr; |
145 |
|
const struct ccs_path_info *saved_program; |
146 |
|
const struct ccs_path_info *saved_domainname = NULL; |
147 |
|
int error = is_delete ? -ENOENT : -ENOMEM; |
148 |
|
bool is_last_name = false; |
149 |
|
if (!ccs_is_correct_path(program, 1, -1, -1)) |
150 |
|
return -EINVAL; /* No patterns allowed. */ |
151 |
if (domainname) { |
if (domainname) { |
152 |
if (!IsDomainDef(domainname) && IsCorrectPath(domainname, 1, -1, -1, __FUNCTION__)) { |
if (!ccs_is_domain_def(domainname) && |
153 |
is_last_name = 1; |
ccs_is_correct_path(domainname, 1, -1, -1)) |
154 |
} else if (!IsCorrectDomain(domainname, __FUNCTION__)) { |
is_last_name = true; |
155 |
|
else if (!ccs_is_correct_domain(domainname)) |
156 |
return -EINVAL; |
return -EINVAL; |
157 |
} |
saved_domainname = ccs_get_name(domainname); |
158 |
if ((saved_domainname = SaveName(domainname)) == NULL) return -ENOMEM; |
if (!saved_domainname) |
159 |
} |
return -ENOMEM; |
160 |
if ((saved_program = SaveName(program)) == NULL) return -ENOMEM; |
} |
161 |
down(&lock); |
saved_program = ccs_get_name(program); |
162 |
for (ptr = domain_initializer_list; ptr; ptr = ptr->next) { |
if (!saved_program) { |
163 |
if (ptr->is_not == is_not && ptr->is_oldstyle == is_oldstyle && ptr->domainname == saved_domainname && ptr->program == saved_program) { |
ccs_put_name(saved_domainname); |
164 |
ptr->is_deleted = is_delete; |
return -ENOMEM; |
165 |
error = 0; |
} |
166 |
goto out; |
if (!is_delete) |
167 |
} |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
168 |
} |
mutex_lock(&ccs_policy_lock); |
169 |
if (is_delete) { |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
170 |
error = -ENOENT; |
if (ptr->is_not != is_not || |
171 |
goto out; |
ptr->domainname != saved_domainname || |
172 |
} |
ptr->program != saved_program) |
173 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
continue; |
174 |
new_entry->domainname = saved_domainname; |
ptr->is_deleted = is_delete; |
175 |
new_entry->program = saved_program; |
error = 0; |
176 |
new_entry->is_not = is_not; |
break; |
|
new_entry->is_last_name = is_last_name; |
|
|
new_entry->is_oldstyle = is_oldstyle; |
|
|
mb(); /* Instead of using spinlock. */ |
|
|
if ((ptr = domain_initializer_list) != NULL) { |
|
|
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
|
|
} else { |
|
|
domain_initializer_list = new_entry; |
|
177 |
} |
} |
178 |
error = 0; |
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
179 |
out: |
entry->domainname = saved_domainname; |
180 |
up(&lock); |
saved_domainname = NULL; |
181 |
|
entry->program = saved_program; |
182 |
|
saved_program = NULL; |
183 |
|
entry->is_not = is_not; |
184 |
|
entry->is_last_name = is_last_name; |
185 |
|
list_add_tail_rcu(&entry->list, &ccs_domain_initializer_list); |
186 |
|
entry = NULL; |
187 |
|
error = 0; |
188 |
|
} |
189 |
|
mutex_unlock(&ccs_policy_lock); |
190 |
|
ccs_put_name(saved_domainname); |
191 |
|
ccs_put_name(saved_program); |
192 |
|
kfree(entry); |
193 |
return error; |
return error; |
194 |
} |
} |
195 |
|
|
196 |
int ReadDomainInitializerPolicy(struct io_buffer *head) |
/** |
197 |
|
* ccs_read_domain_initializer_policy - Read "struct ccs_domain_initializer_entry" list. |
198 |
|
* |
199 |
|
* @head: Pointer to "struct ccs_io_buffer". |
200 |
|
* |
201 |
|
* Returns true on success, false otherwise. |
202 |
|
* |
203 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
204 |
|
*/ |
205 |
|
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
206 |
{ |
{ |
207 |
struct domain_initializer_entry *ptr = head->read_var2; |
struct list_head *pos; |
208 |
if (!ptr) ptr = domain_initializer_list; |
bool done = true; |
209 |
while (ptr) { |
list_for_each_cookie(pos, head->read_var2, |
210 |
head->read_var2 = ptr; |
&ccs_domain_initializer_list) { |
211 |
if (!ptr->is_deleted) { |
const char *no; |
212 |
if (ptr->domainname) { |
const char *from = ""; |
213 |
if (io_printf(head, "%s%s%s from %s\n", ptr->is_not ? "no_" : "", ptr->is_oldstyle ? KEYWORD_INITIALIZER : KEYWORD_INITIALIZE_DOMAIN, ptr->program->name, ptr->domainname->name)) break; |
const char *domain = ""; |
214 |
} else { |
struct ccs_domain_initializer_entry *ptr; |
215 |
if (io_printf(head, "%s%s%s\n", ptr->is_not ? "no_" : "", ptr->is_oldstyle ? KEYWORD_INITIALIZER : KEYWORD_INITIALIZE_DOMAIN, ptr->program->name)) break; |
ptr = list_entry(pos, struct ccs_domain_initializer_entry, |
216 |
} |
list); |
217 |
|
if (ptr->is_deleted) |
218 |
|
continue; |
219 |
|
no = ptr->is_not ? "no_" : ""; |
220 |
|
if (ptr->domainname) { |
221 |
|
from = " from "; |
222 |
|
domain = ptr->domainname->name; |
223 |
} |
} |
224 |
ptr = ptr->next; |
done = ccs_io_printf(head, |
225 |
|
"%s" KEYWORD_INITIALIZE_DOMAIN "%s%s%s\n", |
226 |
|
no, ptr->program->name, from, domain); |
227 |
|
if (!done) |
228 |
|
break; |
229 |
} |
} |
230 |
return ptr ? -ENOMEM : 0; |
return done; |
231 |
} |
} |
232 |
|
|
233 |
int AddDomainInitializerPolicy(char *data, const int is_not, const int is_delete, const int is_oldstyle) |
/** |
234 |
|
* ccs_write_domain_initializer_policy - Write "struct ccs_domain_initializer_entry" list. |
235 |
|
* |
236 |
|
* @data: String to parse. |
237 |
|
* @is_not: True if it is "no_initialize_domain" entry. |
238 |
|
* @is_delete: True if it is a delete request. |
239 |
|
* |
240 |
|
* Returns 0 on success, negative value otherwise. |
241 |
|
*/ |
242 |
|
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
243 |
|
const bool is_delete) |
244 |
{ |
{ |
245 |
char *cp = strstr(data, " from "); |
char *cp = strstr(data, " from "); |
246 |
if (cp) { |
if (cp) { |
247 |
*cp = '\0'; |
*cp = '\0'; |
248 |
return AddDomainInitializerEntry(cp + 6, data, is_not, is_delete, is_oldstyle); |
return ccs_update_domain_initializer_entry(cp + 6, data, |
249 |
} else { |
is_not, is_delete); |
|
return AddDomainInitializerEntry(NULL, data, is_not, is_delete, is_oldstyle); |
|
250 |
} |
} |
251 |
|
return ccs_update_domain_initializer_entry(NULL, data, is_not, |
252 |
|
is_delete); |
253 |
} |
} |
254 |
|
|
255 |
static int IsDomainInitializer(const struct path_info *domainname, const struct path_info *program, const struct path_info *last_name) |
/** |
256 |
{ |
* ccs_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
257 |
struct domain_initializer_entry *ptr; |
* |
258 |
int flag = 0; |
* @domainname: The name of domain. |
259 |
for (ptr = domain_initializer_list; ptr; ptr = ptr->next) { |
* @program: The name of program. |
260 |
if (ptr->is_deleted ) continue; |
* @last_name: The last component of @domainname. |
261 |
|
* |
262 |
|
* Returns true if executing @program reinitializes domain transition, |
263 |
|
* false otherwise. |
264 |
|
* |
265 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
266 |
|
*/ |
267 |
|
static bool ccs_is_domain_initializer(const struct ccs_path_info *domainname, |
268 |
|
const struct ccs_path_info *program, |
269 |
|
const struct ccs_path_info *last_name) |
270 |
|
{ |
271 |
|
struct ccs_domain_initializer_entry *ptr; |
272 |
|
bool flag = false; |
273 |
|
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, list) { |
274 |
|
if (ptr->is_deleted) |
275 |
|
continue; |
276 |
if (ptr->domainname) { |
if (ptr->domainname) { |
277 |
if (!ptr->is_last_name) { |
if (!ptr->is_last_name) { |
278 |
if (ptr->domainname != domainname) continue; |
if (ptr->domainname != domainname) |
279 |
|
continue; |
280 |
} else { |
} else { |
281 |
if (pathcmp(ptr->domainname, last_name)) continue; |
if (ccs_pathcmp(ptr->domainname, last_name)) |
282 |
|
continue; |
283 |
} |
} |
284 |
} |
} |
285 |
if (pathcmp(ptr->program, program)) continue; |
if (ccs_pathcmp(ptr->program, program)) |
286 |
if (ptr->is_not) return 0; |
continue; |
287 |
flag = 1; |
if (ptr->is_not) { |
288 |
|
flag = false; |
289 |
|
break; |
290 |
|
} |
291 |
|
flag = true; |
292 |
} |
} |
293 |
return flag; |
return flag; |
294 |
} |
} |
295 |
|
|
296 |
/************************* DOMAIN KEEPER HANDLER *************************/ |
/* The list for "struct ccs_domain_keeper_entry". */ |
297 |
|
LIST_HEAD(ccs_domain_keeper_list); |
298 |
|
|
299 |
static struct domain_keeper_entry *domain_keeper_list = NULL; |
/** |
300 |
|
* ccs_update_domain_keeper_entry - Update "struct ccs_domain_keeper_entry" list. |
301 |
static int AddDomainKeeperEntry(const char *domainname, const char *program, const int is_not, const int is_delete) |
* |
302 |
{ |
* @domainname: The name of domain. |
303 |
struct domain_keeper_entry *new_entry, *ptr; |
* @program: The name of program. May be NULL. |
304 |
const struct path_info *saved_domainname, *saved_program = NULL; |
* @is_not: True if it is "no_keep_domain" entry. |
305 |
static DECLARE_MUTEX(lock); |
* @is_delete: True if it is a delete request. |
306 |
int error = -ENOMEM; |
* |
307 |
int is_last_name = 0; |
* Returns 0 on success, negative value otherwise. |
308 |
if (!IsDomainDef(domainname) && IsCorrectPath(domainname, 1, -1, -1, __FUNCTION__)) { |
*/ |
309 |
is_last_name = 1; |
static int ccs_update_domain_keeper_entry(const char *domainname, |
310 |
} else if (!IsCorrectDomain(domainname, __FUNCTION__)) { |
const char *program, |
311 |
|
const bool is_not, |
312 |
|
const bool is_delete) |
313 |
|
{ |
314 |
|
struct ccs_domain_keeper_entry *entry = NULL; |
315 |
|
struct ccs_domain_keeper_entry *ptr; |
316 |
|
const struct ccs_path_info *saved_domainname; |
317 |
|
const struct ccs_path_info *saved_program = NULL; |
318 |
|
int error = is_delete ? -ENOENT : -ENOMEM; |
319 |
|
bool is_last_name = false; |
320 |
|
if (!ccs_is_domain_def(domainname) && |
321 |
|
ccs_is_correct_path(domainname, 1, -1, -1)) |
322 |
|
is_last_name = true; |
323 |
|
else if (!ccs_is_correct_domain(domainname)) |
324 |
return -EINVAL; |
return -EINVAL; |
|
} |
|
325 |
if (program) { |
if (program) { |
326 |
if (!IsCorrectPath(program, 1, -1, -1, __FUNCTION__)) return -EINVAL; |
if (!ccs_is_correct_path(program, 1, -1, -1)) |
327 |
if ((saved_program = SaveName(program)) == NULL) return -ENOMEM; |
return -EINVAL; |
328 |
} |
saved_program = ccs_get_name(program); |
329 |
if ((saved_domainname = SaveName(domainname)) == NULL) return -ENOMEM; |
if (!saved_program) |
330 |
down(&lock); |
return -ENOMEM; |
331 |
for (ptr = domain_keeper_list; ptr; ptr = ptr->next) { |
} |
332 |
if (ptr->is_not == is_not && ptr->domainname == saved_domainname && ptr->program == saved_program) { |
saved_domainname = ccs_get_name(domainname); |
333 |
ptr->is_deleted = is_delete; |
if (!saved_domainname) { |
334 |
error = 0; |
ccs_put_name(saved_program); |
335 |
goto out; |
return -ENOMEM; |
336 |
} |
} |
337 |
} |
if (!is_delete) |
338 |
if (is_delete) { |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
339 |
error = -ENOENT; |
mutex_lock(&ccs_policy_lock); |
340 |
goto out; |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
341 |
} |
if (ptr->is_not != is_not || |
342 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
ptr->domainname != saved_domainname || |
343 |
new_entry->domainname = saved_domainname; |
ptr->program != saved_program) |
344 |
new_entry->program = saved_program; |
continue; |
345 |
new_entry->is_not = is_not; |
ptr->is_deleted = is_delete; |
346 |
new_entry->is_last_name = is_last_name; |
error = 0; |
347 |
mb(); /* Instead of using spinlock. */ |
break; |
|
if ((ptr = domain_keeper_list) != NULL) { |
|
|
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
|
|
} else { |
|
|
domain_keeper_list = new_entry; |
|
348 |
} |
} |
349 |
error = 0; |
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
350 |
out: |
entry->domainname = saved_domainname; |
351 |
up(&lock); |
saved_domainname = NULL; |
352 |
|
entry->program = saved_program; |
353 |
|
saved_program = NULL; |
354 |
|
entry->is_not = is_not; |
355 |
|
entry->is_last_name = is_last_name; |
356 |
|
list_add_tail_rcu(&entry->list, &ccs_domain_keeper_list); |
357 |
|
entry = NULL; |
358 |
|
error = 0; |
359 |
|
} |
360 |
|
mutex_unlock(&ccs_policy_lock); |
361 |
|
ccs_put_name(saved_domainname); |
362 |
|
ccs_put_name(saved_program); |
363 |
|
kfree(entry); |
364 |
return error; |
return error; |
365 |
} |
} |
366 |
|
|
367 |
int AddDomainKeeperPolicy(char *data, const int is_not, const int is_delete) |
/** |
368 |
|
* ccs_write_domain_keeper_policy - Write "struct ccs_domain_keeper_entry" list. |
369 |
|
* |
370 |
|
* @data: String to parse. |
371 |
|
* @is_not: True if it is "no_keep_domain" entry. |
372 |
|
* @is_delete: True if it is a delete request. |
373 |
|
* |
374 |
|
*/ |
375 |
|
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
376 |
|
const bool is_delete) |
377 |
{ |
{ |
378 |
char *cp = strstr(data, " from "); |
char *cp = strstr(data, " from "); |
379 |
if (cp) { |
if (cp) { |
380 |
*cp = '\0'; |
*cp = '\0'; |
381 |
return AddDomainKeeperEntry(cp + 6, data, is_not, is_delete); |
return ccs_update_domain_keeper_entry(cp + 6, data, |
382 |
} else { |
is_not, is_delete); |
|
return AddDomainKeeperEntry(data, NULL, is_not, is_delete); |
|
383 |
} |
} |
384 |
|
return ccs_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
385 |
} |
} |
386 |
|
|
387 |
int ReadDomainKeeperPolicy(struct io_buffer *head) |
/** |
388 |
|
* ccs_read_domain_keeper_policy - Read "struct ccs_domain_keeper_entry" list. |
389 |
|
* |
390 |
|
* @head: Pointer to "struct ccs_io_buffer". |
391 |
|
* |
392 |
|
* Returns true on success, false otherwise. |
393 |
|
* |
394 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
395 |
|
*/ |
396 |
|
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
397 |
{ |
{ |
398 |
struct domain_keeper_entry *ptr = head->read_var2; |
struct list_head *pos; |
399 |
if (!ptr) ptr = domain_keeper_list; |
bool done = true; |
400 |
while (ptr) { |
list_for_each_cookie(pos, head->read_var2, |
401 |
head->read_var2 = ptr; |
&ccs_domain_keeper_list) { |
402 |
if (!ptr->is_deleted) { |
struct ccs_domain_keeper_entry *ptr; |
403 |
if (ptr->program) { |
const char *no; |
404 |
if (io_printf(head, "%s" KEYWORD_KEEP_DOMAIN "%s from %s\n", ptr->is_not ? "no_" : "", ptr->program->name, ptr->domainname->name)) break; |
const char *from = ""; |
405 |
} else { |
const char *program = ""; |
406 |
if (io_printf(head, "%s" KEYWORD_KEEP_DOMAIN "%s\n", ptr->is_not ? "no_" : "", ptr->domainname->name)) break; |
ptr = list_entry(pos, struct ccs_domain_keeper_entry, list); |
407 |
} |
if (ptr->is_deleted) |
408 |
|
continue; |
409 |
|
no = ptr->is_not ? "no_" : ""; |
410 |
|
if (ptr->program) { |
411 |
|
from = " from "; |
412 |
|
program = ptr->program->name; |
413 |
} |
} |
414 |
ptr = ptr->next; |
done = ccs_io_printf(head, |
415 |
|
"%s" KEYWORD_KEEP_DOMAIN "%s%s%s\n", no, |
416 |
|
program, from, ptr->domainname->name); |
417 |
|
if (!done) |
418 |
|
break; |
419 |
} |
} |
420 |
return ptr ? -ENOMEM : 0; |
return done; |
421 |
} |
} |
422 |
|
|
423 |
static int IsDomainKeeper(const struct path_info *domainname, const struct path_info *program, const struct path_info *last_name) |
/** |
424 |
{ |
* ccs_is_domain_keeper - Check whether the given program causes domain transition suppression. |
425 |
struct domain_keeper_entry *ptr; |
* |
426 |
int flag = 0; |
* @domainname: The name of domain. |
427 |
for (ptr = domain_keeper_list; ptr; ptr = ptr->next) { |
* @program: The name of program. |
428 |
if (ptr->is_deleted) continue; |
* @last_name: The last component of @domainname. |
429 |
|
* |
430 |
|
* Returns true if executing @program supresses domain transition, |
431 |
|
* false otherwise. |
432 |
|
* |
433 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
434 |
|
*/ |
435 |
|
static bool ccs_is_domain_keeper(const struct ccs_path_info *domainname, |
436 |
|
const struct ccs_path_info *program, |
437 |
|
const struct ccs_path_info *last_name) |
438 |
|
{ |
439 |
|
struct ccs_domain_keeper_entry *ptr; |
440 |
|
bool flag = false; |
441 |
|
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
442 |
|
if (ptr->is_deleted) |
443 |
|
continue; |
444 |
if (!ptr->is_last_name) { |
if (!ptr->is_last_name) { |
445 |
if (ptr->domainname != domainname) continue; |
if (ptr->domainname != domainname) |
446 |
|
continue; |
447 |
} else { |
} else { |
448 |
if (pathcmp(ptr->domainname, last_name)) continue; |
if (ccs_pathcmp(ptr->domainname, last_name)) |
449 |
|
continue; |
450 |
} |
} |
451 |
if (ptr->program && pathcmp(ptr->program, program)) continue; |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
452 |
if (ptr->is_not) return 0; |
continue; |
453 |
flag = 1; |
if (ptr->is_not) { |
454 |
|
flag = false; |
455 |
|
break; |
456 |
|
} |
457 |
|
flag = true; |
458 |
} |
} |
459 |
return flag; |
return flag; |
460 |
} |
} |
461 |
|
|
462 |
/************************* SYMBOLIC LINKED PROGRAM HANDLER *************************/ |
/* The list for "struct ccs_alias_entry". */ |
463 |
|
LIST_HEAD(ccs_alias_list); |
|
static struct alias_entry *alias_list = NULL; |
|
464 |
|
|
465 |
static int AddAliasEntry(const char *original_name, const char *aliased_name, const int is_delete) |
/** |
466 |
{ |
* ccs_update_alias_entry - Update "struct ccs_alias_entry" list. |
467 |
struct alias_entry *new_entry, *ptr; |
* |
468 |
static DECLARE_MUTEX(lock); |
* @original_name: The original program's real name. |
469 |
const struct path_info *saved_original_name, *saved_aliased_name; |
* @aliased_name: The symbolic program's symbolic link's name. |
470 |
int error = -ENOMEM; |
* @is_delete: True if it is a delete request. |
471 |
if (!IsCorrectPath(original_name, 1, -1, -1, __FUNCTION__) || !IsCorrectPath(aliased_name, 1, -1, -1, __FUNCTION__)) return -EINVAL; /* No patterns allowed. */ |
* |
472 |
if ((saved_original_name = SaveName(original_name)) == NULL || (saved_aliased_name = SaveName(aliased_name)) == NULL) return -ENOMEM; |
* Returns 0 on success, negative value otherwise. |
473 |
down(&lock); |
*/ |
474 |
for (ptr = alias_list; ptr; ptr = ptr->next) { |
static int ccs_update_alias_entry(const char *original_name, |
475 |
if (ptr->original_name == saved_original_name && ptr->aliased_name == saved_aliased_name) { |
const char *aliased_name, |
476 |
ptr->is_deleted = is_delete; |
const bool is_delete) |
477 |
error = 0; |
{ |
478 |
goto out; |
struct ccs_alias_entry *entry = NULL; |
479 |
} |
struct ccs_alias_entry *ptr; |
480 |
} |
const struct ccs_path_info *saved_original_name; |
481 |
if (is_delete) { |
const struct ccs_path_info *saved_aliased_name; |
482 |
error = -ENOENT; |
int error = is_delete ? -ENOENT : -ENOMEM; |
483 |
goto out; |
if (!ccs_is_correct_path(original_name, 1, -1, -1) || |
484 |
} |
!ccs_is_correct_path(aliased_name, 1, -1, -1)) |
485 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
return -EINVAL; /* No patterns allowed. */ |
486 |
new_entry->original_name = saved_original_name; |
saved_original_name = ccs_get_name(original_name); |
487 |
new_entry->aliased_name = saved_aliased_name; |
saved_aliased_name = ccs_get_name(aliased_name); |
488 |
mb(); /* Instead of using spinlock. */ |
if (!saved_original_name || !saved_aliased_name) { |
489 |
if ((ptr = alias_list) != NULL) { |
ccs_put_name(saved_original_name); |
490 |
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
ccs_put_name(saved_aliased_name); |
491 |
} else { |
return -ENOMEM; |
492 |
alias_list = new_entry; |
} |
493 |
|
if (!is_delete) |
494 |
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
495 |
|
mutex_lock(&ccs_policy_lock); |
496 |
|
list_for_each_entry_rcu(ptr, &ccs_alias_list, list) { |
497 |
|
if (ptr->original_name != saved_original_name || |
498 |
|
ptr->aliased_name != saved_aliased_name) |
499 |
|
continue; |
500 |
|
ptr->is_deleted = is_delete; |
501 |
|
error = 0; |
502 |
|
break; |
503 |
} |
} |
504 |
error = 0; |
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
505 |
out: |
entry->original_name = saved_original_name; |
506 |
up(&lock); |
saved_original_name = NULL; |
507 |
|
entry->aliased_name = saved_aliased_name; |
508 |
|
saved_aliased_name = NULL; |
509 |
|
list_add_tail_rcu(&entry->list, &ccs_alias_list); |
510 |
|
entry = NULL; |
511 |
|
error = 0; |
512 |
|
} |
513 |
|
mutex_unlock(&ccs_policy_lock); |
514 |
|
ccs_put_name(saved_original_name); |
515 |
|
ccs_put_name(saved_aliased_name); |
516 |
|
kfree(entry); |
517 |
return error; |
return error; |
518 |
} |
} |
519 |
|
|
520 |
int ReadAliasPolicy(struct io_buffer *head) |
/** |
521 |
|
* ccs_read_alias_policy - Read "struct ccs_alias_entry" list. |
522 |
|
* |
523 |
|
* @head: Pointer to "struct ccs_io_buffer". |
524 |
|
* |
525 |
|
* Returns true on success, false otherwise. |
526 |
|
* |
527 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
528 |
|
*/ |
529 |
|
bool ccs_read_alias_policy(struct ccs_io_buffer *head) |
530 |
{ |
{ |
531 |
struct alias_entry *ptr = head->read_var2; |
struct list_head *pos; |
532 |
if (!ptr) ptr = alias_list; |
bool done = true; |
533 |
while (ptr) { |
list_for_each_cookie(pos, head->read_var2, &ccs_alias_list) { |
534 |
head->read_var2 = ptr; |
struct ccs_alias_entry *ptr; |
535 |
if (!ptr->is_deleted && io_printf(head, KEYWORD_ALIAS "%s %s\n", ptr->original_name->name, ptr->aliased_name->name)) break; |
ptr = list_entry(pos, struct ccs_alias_entry, list); |
536 |
ptr = ptr->next; |
if (ptr->is_deleted) |
537 |
|
continue; |
538 |
|
done = ccs_io_printf(head, KEYWORD_ALIAS "%s %s\n", |
539 |
|
ptr->original_name->name, |
540 |
|
ptr->aliased_name->name); |
541 |
|
if (!done) |
542 |
|
break; |
543 |
} |
} |
544 |
return ptr ? -ENOMEM : 0; |
return done; |
545 |
} |
} |
546 |
|
|
547 |
int AddAliasPolicy(char *data, const int is_delete) |
/** |
548 |
|
* ccs_write_alias_policy - Write "struct ccs_alias_entry" list. |
549 |
|
* |
550 |
|
* @data: String to parse. |
551 |
|
* @is_delete: True if it is a delete request. |
552 |
|
* |
553 |
|
* Returns 0 on success, negative value otherwise. |
554 |
|
*/ |
555 |
|
int ccs_write_alias_policy(char *data, const bool is_delete) |
556 |
{ |
{ |
557 |
char *cp = strchr(data, ' '); |
char *cp = strchr(data, ' '); |
558 |
if (!cp) return -EINVAL; |
if (!cp) |
559 |
|
return -EINVAL; |
560 |
*cp++ = '\0'; |
*cp++ = '\0'; |
561 |
return AddAliasEntry(data, cp, is_delete); |
return ccs_update_alias_entry(data, cp, is_delete); |
562 |
} |
} |
563 |
|
|
564 |
/************************* DOMAIN AGGREGATOR HANDLER *************************/ |
/* The list for "struct ccs_aggregator_entry". */ |
565 |
|
LIST_HEAD(ccs_aggregator_list); |
566 |
|
|
567 |
static struct aggregator_entry *aggregator_list = NULL; |
/** |
568 |
|
* ccs_update_aggregator_entry - Update "struct ccs_aggregator_entry" list. |
569 |
static int AddAggregatorEntry(const char *original_name, const char *aggregated_name, const int is_delete) |
* |
570 |
{ |
* @original_name: The original program's name. |
571 |
struct aggregator_entry *new_entry, *ptr; |
* @aggregated_name: The aggregated program's name. |
572 |
static DECLARE_MUTEX(lock); |
* @is_delete: True if it is a delete request. |
573 |
const struct path_info *saved_original_name, *saved_aggregated_name; |
* |
574 |
int error = -ENOMEM; |
* Returns 0 on success, negative value otherwise. |
575 |
if (!IsCorrectPath(original_name, 1, 0, -1, __FUNCTION__) || !IsCorrectPath(aggregated_name, 1, -1, -1, __FUNCTION__)) return -EINVAL; |
*/ |
576 |
if ((saved_original_name = SaveName(original_name)) == NULL || (saved_aggregated_name = SaveName(aggregated_name)) == NULL) return -ENOMEM; |
static int ccs_update_aggregator_entry(const char *original_name, |
577 |
down(&lock); |
const char *aggregated_name, |
578 |
for (ptr = aggregator_list; ptr; ptr = ptr->next) { |
const bool is_delete) |
579 |
if (ptr->original_name == saved_original_name && ptr->aggregated_name == saved_aggregated_name) { |
{ |
580 |
ptr->is_deleted = is_delete; |
struct ccs_aggregator_entry *entry = NULL; |
581 |
error = 0; |
struct ccs_aggregator_entry *ptr; |
582 |
goto out; |
const struct ccs_path_info *saved_original_name; |
583 |
} |
const struct ccs_path_info *saved_aggregated_name; |
584 |
} |
int error = is_delete ? -ENOENT : -ENOMEM; |
585 |
if (is_delete) { |
if (!ccs_is_correct_path(original_name, 1, 0, -1) || |
586 |
error = -ENOENT; |
!ccs_is_correct_path(aggregated_name, 1, -1, -1)) |
587 |
goto out; |
return -EINVAL; |
588 |
} |
saved_original_name = ccs_get_name(original_name); |
589 |
if ((new_entry = alloc_element(sizeof(*new_entry))) == NULL) goto out; |
saved_aggregated_name = ccs_get_name(aggregated_name); |
590 |
new_entry->original_name = saved_original_name; |
if (!saved_original_name || !saved_aggregated_name) { |
591 |
new_entry->aggregated_name = saved_aggregated_name; |
ccs_put_name(saved_original_name); |
592 |
mb(); /* Instead of using spinlock. */ |
ccs_put_name(saved_aggregated_name); |
593 |
if ((ptr = aggregator_list) != NULL) { |
return -ENOMEM; |
594 |
while (ptr->next) ptr = ptr->next; ptr->next = new_entry; |
} |
595 |
} else { |
if (!is_delete) |
596 |
aggregator_list = new_entry; |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
597 |
|
mutex_lock(&ccs_policy_lock); |
598 |
|
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
599 |
|
if (ptr->original_name != saved_original_name || |
600 |
|
ptr->aggregated_name != saved_aggregated_name) |
601 |
|
continue; |
602 |
|
ptr->is_deleted = is_delete; |
603 |
|
error = 0; |
604 |
|
break; |
605 |
} |
} |
606 |
error = 0; |
if (!is_delete && error && ccs_memory_ok(entry, sizeof(*entry))) { |
607 |
out: |
entry->original_name = saved_original_name; |
608 |
up(&lock); |
saved_original_name = NULL; |
609 |
|
entry->aggregated_name = saved_aggregated_name; |
610 |
|
saved_aggregated_name = NULL; |
611 |
|
list_add_tail_rcu(&entry->list, &ccs_aggregator_list); |
612 |
|
entry = NULL; |
613 |
|
error = 0; |
614 |
|
} |
615 |
|
mutex_unlock(&ccs_policy_lock); |
616 |
|
ccs_put_name(saved_original_name); |
617 |
|
ccs_put_name(saved_aggregated_name); |
618 |
|
kfree(entry); |
619 |
return error; |
return error; |
620 |
} |
} |
621 |
|
|
622 |
int ReadAggregatorPolicy(struct io_buffer *head) |
/** |
623 |
|
* ccs_read_aggregator_policy - Read "struct ccs_aggregator_entry" list. |
624 |
|
* |
625 |
|
* @head: Pointer to "struct ccs_io_buffer". |
626 |
|
* |
627 |
|
* Returns true on success, false otherwise. |
628 |
|
* |
629 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
630 |
|
*/ |
631 |
|
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
632 |
{ |
{ |
633 |
struct aggregator_entry *ptr = head->read_var2; |
struct list_head *pos; |
634 |
if (!ptr) ptr = aggregator_list; |
bool done = true; |
635 |
while (ptr) { |
list_for_each_cookie(pos, head->read_var2, &ccs_aggregator_list) { |
636 |
head->read_var2 = ptr; |
struct ccs_aggregator_entry *ptr; |
637 |
if (!ptr->is_deleted && io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", ptr->original_name->name, ptr->aggregated_name->name)) break; |
ptr = list_entry(pos, struct ccs_aggregator_entry, list); |
638 |
ptr = ptr->next; |
if (ptr->is_deleted) |
639 |
|
continue; |
640 |
|
done = ccs_io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", |
641 |
|
ptr->original_name->name, |
642 |
|
ptr->aggregated_name->name); |
643 |
|
if (!done) |
644 |
|
break; |
645 |
} |
} |
646 |
return ptr ? -ENOMEM : 0; |
return done; |
647 |
} |
} |
648 |
|
|
649 |
int AddAggregatorPolicy(char *data, const int is_delete) |
/** |
650 |
|
* ccs_write_aggregator_policy - Write "struct ccs_aggregator_entry" list. |
651 |
|
* |
652 |
|
* @data: String to parse. |
653 |
|
* @is_delete: True if it is a delete request. |
654 |
|
* |
655 |
|
* Returns 0 on success, negative value otherwise. |
656 |
|
*/ |
657 |
|
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
658 |
{ |
{ |
659 |
char *cp = strchr(data, ' '); |
char *cp = strchr(data, ' '); |
660 |
if (!cp) return -EINVAL; |
if (!cp) |
661 |
|
return -EINVAL; |
662 |
*cp++ = '\0'; |
*cp++ = '\0'; |
663 |
return AddAggregatorEntry(data, cp, is_delete); |
return ccs_update_aggregator_entry(data, cp, is_delete); |
664 |
} |
} |
665 |
|
|
666 |
/************************* DOMAIN DELETION HANDLER *************************/ |
/* Domain create/delete handler. */ |
667 |
|
|
668 |
/* #define DEBUG_DOMAIN_UNDELETE */ |
/** |
669 |
|
* ccs_delete_domain - Delete a domain. |
670 |
int DeleteDomain(char *domainname0) |
* |
671 |
|
* @domainname: The name of domain. |
672 |
|
* |
673 |
|
* Returns 0. |
674 |
|
*/ |
675 |
|
int ccs_delete_domain(char *domainname) |
676 |
{ |
{ |
677 |
struct domain_info *domain; |
struct ccs_domain_info *domain; |
678 |
struct path_info domainname; |
struct ccs_path_info name; |
679 |
domainname.name = domainname0; |
name.name = domainname; |
680 |
fill_path_info(&domainname); |
ccs_fill_path_info(&name); |
681 |
down(&new_domain_assign_lock); |
mutex_lock(&ccs_policy_lock); |
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk("DeleteDomain %s\n", domainname0); |
|
|
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { |
|
|
if (pathcmp(domain->domainname, &domainname)) continue; |
|
|
printk("List: %p %u\n", domain, domain->is_deleted); |
|
|
} |
|
|
#endif |
|
682 |
/* Is there an active domain? */ |
/* Is there an active domain? */ |
683 |
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { /* Never delete KERNEL_DOMAIN */ |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
684 |
if (domain->is_deleted || pathcmp(domain->domainname, &domainname)) continue; |
/* Never delete ccs_kernel_domain */ |
685 |
|
if (domain == &ccs_kernel_domain) |
686 |
|
continue; |
687 |
|
if (domain->is_deleted || |
688 |
|
ccs_pathcmp(domain->domainname, &name)) |
689 |
|
continue; |
690 |
|
domain->is_deleted = true; |
691 |
break; |
break; |
692 |
} |
} |
693 |
if (domain) { |
mutex_unlock(&ccs_policy_lock); |
|
struct domain_info *domain2; |
|
|
/* Mark already deleted domains as non undeletable. */ |
|
|
for (domain2 = KERNEL_DOMAIN.next; domain2; domain2 = domain2->next) { |
|
|
if (!domain2->is_deleted || pathcmp(domain2->domainname, &domainname)) continue; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
if (domain2->is_deleted != 255) printk("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("Marked %p as undeletable\n", domain); |
|
|
#endif |
|
|
} |
|
|
up(&new_domain_assign_lock); |
|
694 |
return 0; |
return 0; |
695 |
} |
} |
696 |
|
|
697 |
struct domain_info *UndeleteDomain(const char *domainname0) |
/** |
698 |
{ |
* ccs_find_or_assign_new_domain - Create a domain. |
699 |
struct domain_info *domain, *candidate_domain = NULL; |
* |
700 |
struct path_info domainname; |
* @domainname: The name of domain. |
701 |
domainname.name = domainname0; |
* @profile: Profile number to assign if the domain was newly created. |
702 |
fill_path_info(&domainname); |
* |
703 |
down(&new_domain_assign_lock); |
* Returns pointer to "struct ccs_domain_info" on success, NULL otherwise. |
704 |
#ifdef DEBUG_DOMAIN_UNDELETE |
*/ |
705 |
printk("UndeleteDomain %s\n", domainname0); |
struct ccs_domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
706 |
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { |
const u8 profile) |
|
if (pathcmp(domain->domainname, &domainname)) continue; |
|
|
printk("List: %p %u\n", domain, domain->is_deleted); |
|
|
} |
|
|
#endif |
|
|
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { |
|
|
if (pathcmp(&domainname, domain->domainname)) continue; |
|
|
if (!domain->is_deleted) { |
|
|
/* This domain is active. I can't undelete. */ |
|
|
candidate_domain = NULL; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk("%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("%p was undeleted.\n", candidate_domain); |
|
|
#endif |
|
|
} |
|
|
up(&new_domain_assign_lock); |
|
|
return candidate_domain; |
|
|
} |
|
|
|
|
|
/************************* DOMAIN TRANSITION HANDLER *************************/ |
|
|
|
|
|
struct domain_info *FindDomain(const char *domainname0) |
|
|
{ |
|
|
struct domain_info *domain; |
|
|
static int first = 1; |
|
|
struct path_info domainname; |
|
|
domainname.name = domainname0; |
|
|
fill_path_info(&domainname); |
|
|
if (first) { |
|
|
KERNEL_DOMAIN.domainname = SaveName(ROOT_NAME); |
|
|
first = 0; |
|
|
} |
|
|
for (domain = &KERNEL_DOMAIN; domain; domain = domain->next) { |
|
|
if (!domain->is_deleted && !pathcmp(&domainname, domain->domainname)) return domain; |
|
|
} |
|
|
return NULL; |
|
|
} |
|
|
|
|
|
struct domain_info *FindOrAssignNewDomain(const char *domainname, const u8 profile) |
|
|
{ |
|
|
struct domain_info *domain = NULL; |
|
|
const struct path_info *saved_domainname; |
|
|
down(&new_domain_assign_lock); |
|
|
if ((domain = FindDomain(domainname)) != NULL) goto out; |
|
|
if (!IsCorrectDomain(domainname, __FUNCTION__)) goto out; |
|
|
if ((saved_domainname = SaveName(domainname)) == NULL) goto out; |
|
|
/* Can I reuse memory of deleted domain? */ |
|
|
for (domain = KERNEL_DOMAIN.next; domain; domain = domain->next) { |
|
|
struct task_struct *p; |
|
|
struct acl_info *ptr; |
|
|
int flag; |
|
|
if (!domain->is_deleted || domain->domainname != saved_domainname) continue; |
|
|
flag = 0; |
|
|
/***** CRITICAL SECTION START *****/ |
|
|
read_lock(&tasklist_lock); |
|
|
for_each_process(p) { |
|
|
if (p->domain_info == domain) { flag = 1; break; } |
|
|
} |
|
|
read_unlock(&tasklist_lock); |
|
|
/***** CRITICAL SECTION END *****/ |
|
|
if (flag) continue; |
|
|
#ifdef DEBUG_DOMAIN_UNDELETE |
|
|
printk("Reusing %p %s\n", domain, domain->domainname->name); |
|
|
#endif |
|
|
for (ptr = domain->first_acl_ptr; ptr; ptr = ptr->next) ptr->is_deleted = 1; |
|
|
domain->profile = profile; |
|
|
domain->quota_warned = 0; |
|
|
mb(); /* Instead of using spinlock. */ |
|
|
domain->is_deleted = 0; |
|
|
goto out; |
|
|
} |
|
|
/* No memory reusable. Create using new memory. */ |
|
|
if ((domain = alloc_element(sizeof(*domain))) != NULL) { |
|
|
struct domain_info *ptr = &KERNEL_DOMAIN; |
|
|
domain->domainname = saved_domainname; |
|
|
domain->profile = profile; |
|
|
mb(); /* Instead of using spinlock. */ |
|
|
while (ptr->next) ptr = ptr->next; ptr->next = domain; |
|
|
} |
|
|
out: ; |
|
|
up(&new_domain_assign_lock); |
|
|
return domain; |
|
|
} |
|
|
|
|
|
static int Escape(char *dest, const char *src, int dest_len) |
|
707 |
{ |
{ |
708 |
while (*src) { |
struct ccs_domain_info *entry; |
709 |
const unsigned char c = * (const unsigned char *) src; |
struct ccs_domain_info *domain; |
710 |
if (c == '\\') { |
const struct ccs_path_info *saved_domainname; |
711 |
dest_len -= 2; |
bool found = false; |
712 |
if (dest_len <= 0) goto out; |
|
713 |
*dest++ = '\\'; |
if (!ccs_is_correct_domain(domainname)) |
714 |
*dest++ = '\\'; |
return NULL; |
715 |
} else if (c > ' ' && c < 127) { |
saved_domainname = ccs_get_name(domainname); |
716 |
if (--dest_len <= 0) goto out; |
if (!saved_domainname) |
717 |
*dest++ = c; |
return NULL; |
718 |
} else { |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
719 |
dest_len -= 4; |
mutex_lock(&ccs_policy_lock); |
720 |
if (dest_len <= 0) goto out; |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
721 |
*dest++ = '\\'; |
if (domain->is_deleted || |
722 |
*dest++ = (c >> 6) + '0'; |
ccs_pathcmp(saved_domainname, domain->domainname)) |
723 |
*dest++ = ((c >> 3) & 7) + '0'; |
continue; |
724 |
*dest++ = (c & 7) + '0'; |
found = true; |
725 |
} |
break; |
|
src++; |
|
726 |
} |
} |
727 |
if (--dest_len <= 0) goto out; |
if (!found && ccs_memory_ok(entry, sizeof(*entry))) { |
728 |
*dest = '\0'; |
INIT_LIST_HEAD(&entry->acl_info_list); |
729 |
return 0; |
entry->domainname = saved_domainname; |
730 |
out: |
saved_domainname = NULL; |
731 |
return -ENOMEM; |
entry->profile = profile; |
732 |
|
list_add_tail_rcu(&entry->list, &ccs_domain_list); |
733 |
|
domain = entry; |
734 |
|
entry = NULL; |
735 |
|
found = true; |
736 |
|
} |
737 |
|
mutex_unlock(&ccs_policy_lock); |
738 |
|
ccs_put_name(saved_domainname); |
739 |
|
kfree(entry); |
740 |
|
return found ? domain : NULL; |
741 |
} |
} |
742 |
|
|
743 |
static char *get_argv0(struct linux_binprm *bprm) |
/** |
744 |
|
* ccs_get_argv0 - Get argv[0]. |
745 |
|
* |
746 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
747 |
|
* |
748 |
|
* Returns true on success, false otherwise. |
749 |
|
*/ |
750 |
|
static bool ccs_get_argv0(struct ccs_execve_entry *ee) |
751 |
{ |
{ |
752 |
char *arg_ptr = ccs_alloc(PAGE_SIZE); /* Initial buffer. */ |
struct linux_binprm *bprm = ee->bprm; |
753 |
|
char *arg_ptr = ee->tmp; |
754 |
int arg_len = 0; |
int arg_len = 0; |
755 |
unsigned long pos = bprm->p; |
unsigned long pos = bprm->p; |
756 |
int i = pos / PAGE_SIZE, offset = pos % PAGE_SIZE; |
int offset = pos % PAGE_SIZE; |
757 |
if (!bprm->argc || !arg_ptr) goto out; |
bool done = false; |
758 |
|
if (!bprm->argc) |
759 |
|
goto out; |
760 |
while (1) { |
while (1) { |
761 |
struct page *page; |
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
762 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) && defined(CONFIG_MMU) |
goto out; |
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) goto out; |
|
|
#else |
|
|
page = bprm->page[i]; |
|
|
#endif |
|
|
{ /* Map and copy to kernel buffer and unmap. */ |
|
|
const char *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; |
|
|
} |
|
|
memmove(arg_ptr + arg_len, kaddr + offset, PAGE_SIZE - offset); |
|
|
kunmap(page); |
|
|
} |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) && defined(CONFIG_MMU) |
|
|
put_page(page); |
|
763 |
pos += PAGE_SIZE - offset; |
pos += PAGE_SIZE - offset; |
764 |
#endif |
/* Read. */ |
765 |
arg_len += PAGE_SIZE - offset; |
while (offset < PAGE_SIZE) { |
766 |
if (memchr(arg_ptr, '\0', arg_len)) break; |
const char *kaddr = ee->dump.data; |
767 |
{ /* Initial buffer was too small for argv[0]. Retry after expanding buffer. */ |
const unsigned char c = kaddr[offset++]; |
768 |
char *tmp_arg_ptr = ccs_alloc(arg_len + PAGE_SIZE); |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
769 |
if (!tmp_arg_ptr) goto out; |
if (c == '\\') { |
770 |
memmove(tmp_arg_ptr, arg_ptr, arg_len); |
arg_ptr[arg_len++] = '\\'; |
771 |
ccs_free(arg_ptr); |
arg_ptr[arg_len++] = '\\'; |
772 |
arg_ptr = tmp_arg_ptr; |
} else if (c == '/') { |
773 |
|
arg_len = 0; |
774 |
|
} else if (c > ' ' && c < 127) { |
775 |
|
arg_ptr[arg_len++] = c; |
776 |
|
} else { |
777 |
|
arg_ptr[arg_len++] = '\\'; |
778 |
|
arg_ptr[arg_len++] = (c >> 6) + '0'; |
779 |
|
arg_ptr[arg_len++] |
780 |
|
= ((c >> 3) & 7) + '0'; |
781 |
|
arg_ptr[arg_len++] = (c & 7) + '0'; |
782 |
|
} |
783 |
|
} else { |
784 |
|
arg_ptr[arg_len] = '\0'; |
785 |
|
done = true; |
786 |
|
break; |
787 |
|
} |
788 |
} |
} |
|
i++; |
|
789 |
offset = 0; |
offset = 0; |
790 |
|
if (done) |
791 |
|
break; |
792 |
} |
} |
793 |
return arg_ptr; |
return true; |
794 |
out: /* Release initial buffer. */ |
out: |
795 |
ccs_free(arg_ptr); |
return false; |
|
return NULL; |
|
796 |
} |
} |
797 |
|
|
798 |
static int FindNextDomain(struct linux_binprm *bprm, struct domain_info **next_domain) |
/** |
799 |
{ |
* ccs_find_next_domain - Find a domain. |
800 |
/* This function assumes that the size of buffer returned by realpath() = CCS_MAX_PATHNAME_LEN. */ |
* |
801 |
struct domain_info *old_domain = current->domain_info, *domain = NULL; |
* @ee: Pointer to "struct ccs_execve_entry". |
802 |
const char *old_domain_name = old_domain->domainname->name; |
* |
803 |
const char *original_name = bprm->filename; |
* Returns 0 on success, negative value otherwise. |
804 |
struct file *filp = bprm->file; |
* |
805 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
806 |
|
*/ |
807 |
|
static int ccs_find_next_domain(struct ccs_execve_entry *ee) |
808 |
|
{ |
809 |
|
struct ccs_request_info *r = &ee->r; |
810 |
|
const struct ccs_path_info *handler = ee->handler; |
811 |
|
struct ccs_domain_info *domain = NULL; |
812 |
|
const char *old_domain_name = r->domain->domainname->name; |
813 |
|
struct linux_binprm *bprm = ee->bprm; |
814 |
|
const u8 mode = r->mode; |
815 |
|
const bool is_enforce = (mode == 3); |
816 |
|
const u32 ccs_flags = current->ccs_flags; |
817 |
char *new_domain_name = NULL; |
char *new_domain_name = NULL; |
818 |
char *real_program_name = NULL, *symlink_program_name = NULL; |
struct ccs_path_info rn; /* real name */ |
819 |
const int is_enforce = CheckCCSEnforce(CCS_TOMOYO_MAC_FOR_FILE); |
struct ccs_path_info sn; /* symlink name */ |
820 |
|
struct ccs_path_info ln; /* last name */ |
821 |
int retval; |
int retval; |
822 |
struct path_info r, s, l; |
retry: |
823 |
|
current->ccs_flags = ccs_flags; |
824 |
|
r->cond = NULL; |
825 |
|
/* Get realpath of program and symbolic link. */ |
826 |
|
retval = ccs_realpath_both(bprm->filename, ee); |
827 |
|
if (retval < 0) |
828 |
|
goto out; |
829 |
|
|
830 |
{ |
rn.name = ee->program_path; |
831 |
/* |
ccs_fill_path_info(&rn); |
832 |
* Built-in initializers. This is needed because policies are not loaded until starting /sbin/init . |
sn.name = ee->tmp; |
833 |
*/ |
ccs_fill_path_info(&sn); |
834 |
static int first = 1; |
ln.name = ccs_get_last_name(r->domain); |
835 |
if (first) { |
ccs_fill_path_info(&ln); |
836 |
AddDomainInitializerEntry(NULL, "/sbin/hotplug", 0, 0, 0); |
|
837 |
AddDomainInitializerEntry(NULL, "/sbin/modprobe", 0, 0, 0); |
if (handler) { |
838 |
first = 0; |
if (ccs_pathcmp(&rn, handler)) { |
839 |
|
/* Failed to verify execute handler. */ |
840 |
|
static u8 counter = 20; |
841 |
|
if (counter) { |
842 |
|
counter--; |
843 |
|
printk(KERN_WARNING "Failed to verify: %s\n", |
844 |
|
handler->name); |
845 |
|
} |
846 |
|
goto out; |
847 |
} |
} |
848 |
|
goto calculate_domain; |
849 |
} |
} |
850 |
|
|
|
/* Get realpath of program. */ |
|
|
retval = -ENOENT; /* I hope realpath() won't fail with -ENOMEM. */ |
|
|
if ((real_program_name = realpath(original_name)) == NULL) goto out; |
|
|
/* Get realpath of symbolic link. */ |
|
|
if ((symlink_program_name = realpath_nofollow(original_name)) == NULL) goto out; |
|
|
|
|
|
r.name = real_program_name; |
|
|
fill_path_info(&r); |
|
|
s.name = symlink_program_name; |
|
|
fill_path_info(&s); |
|
|
if ((l.name = strrchr(old_domain_name, ' ')) != NULL) l.name++; |
|
|
else l.name = old_domain_name; |
|
|
fill_path_info(&l); |
|
|
|
|
851 |
/* Check 'alias' directive. */ |
/* Check 'alias' directive. */ |
852 |
if (pathcmp(&r, &s)) { |
if (ccs_pathcmp(&rn, &sn)) { |
853 |
struct alias_entry *ptr; |
struct ccs_alias_entry *ptr; |
854 |
/* Is this program allowed to be called via symbolic links? */ |
/* Is this program allowed to be called via symbolic links? */ |
855 |
for (ptr = alias_list; ptr; ptr = ptr->next) { |
list_for_each_entry_rcu(ptr, &ccs_alias_list, list) { |
856 |
if (ptr->is_deleted || pathcmp(&r, ptr->original_name) || pathcmp(&s, ptr->aliased_name)) continue; |
if (ptr->is_deleted || |
857 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
ccs_pathcmp(&rn, ptr->original_name) || |
858 |
strncpy(real_program_name, ptr->aliased_name->name, CCS_MAX_PATHNAME_LEN - 1); |
ccs_pathcmp(&sn, ptr->aliased_name)) |
859 |
fill_path_info(&r); |
continue; |
860 |
|
strncpy(ee->program_path, ptr->aliased_name->name, |
861 |
|
CCS_MAX_PATHNAME_LEN - 1); |
862 |
|
ccs_fill_path_info(&rn); |
863 |
break; |
break; |
864 |
} |
} |
865 |
} |
} |
866 |
|
/* sn will be overwritten after here. */ |
867 |
/* Compare basename of real_program_name and argv[0] */ |
|
868 |
if (bprm->argc > 0 && CheckCCSFlags(CCS_TOMOYO_MAC_FOR_ARGV0)) { |
/* Compare basename of program_path and argv[0] */ |
869 |
char *org_argv0 = get_argv0(bprm); |
r->mode = ccs_check_flags(r->domain, CCS_MAC_FOR_ARGV0); |
870 |
|
if (bprm->argc > 0 && r->mode) { |
871 |
|
char *base_argv0 = ee->tmp; |
872 |
|
const char *base_filename; |
873 |
retval = -ENOMEM; |
retval = -ENOMEM; |
874 |
if (org_argv0) { |
if (!ccs_get_argv0(ee)) |
875 |
const int len = strlen(org_argv0); |
goto out; |
876 |
char *printable_argv0 = ccs_alloc(len * 4 + 8); |
base_filename = strrchr(ee->program_path, '/'); |
877 |
if (printable_argv0 && Escape(printable_argv0, org_argv0, len * 4 + 8) == 0) { |
if (!base_filename) |
878 |
const char *base_argv0, *base_filename; |
base_filename = ee->program_path; |
879 |
if ((base_argv0 = strrchr(printable_argv0, '/')) == NULL) base_argv0 = printable_argv0; else base_argv0++; |
else |
880 |
if ((base_filename = strrchr(real_program_name, '/')) == NULL) base_filename = real_program_name; else base_filename++; |
base_filename++; |
881 |
if (strcmp(base_argv0, base_filename)) retval = CheckArgv0Perm(&r, base_argv0); |
if (strcmp(base_argv0, base_filename)) { |
882 |
else retval = 0; |
retval = ccs_check_argv0_perm(r, &rn, base_argv0); |
883 |
} |
if (retval == 1) |
884 |
ccs_free(printable_argv0); |
goto retry; |
885 |
ccs_free(org_argv0); |
if (retval < 0) |
886 |
|
goto out; |
887 |
} |
} |
|
if (retval) goto out; |
|
888 |
} |
} |
889 |
|
|
890 |
/* Check 'aggregator' directive. */ |
/* Check 'aggregator' directive. */ |
891 |
{ |
{ |
892 |
struct aggregator_entry *ptr; |
struct ccs_aggregator_entry *ptr; |
893 |
/* Is this program allowed to be aggregated? */ |
/* Is this program allowed to be aggregated? */ |
894 |
for (ptr = aggregator_list; ptr; ptr = ptr->next) { |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
895 |
if (ptr->is_deleted || !PathMatchesToPattern(&r, ptr->original_name)) continue; |
if (ptr->is_deleted || |
896 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
897 |
strncpy(real_program_name, ptr->aggregated_name->name, CCS_MAX_PATHNAME_LEN - 1); |
continue; |
898 |
fill_path_info(&r); |
strncpy(ee->program_path, ptr->aggregated_name->name, |
899 |
|
CCS_MAX_PATHNAME_LEN - 1); |
900 |
|
ccs_fill_path_info(&rn); |
901 |
break; |
break; |
902 |
} |
} |
903 |
} |
} |
904 |
|
|
905 |
/* Check execute permission. */ |
/* Check execute permission. */ |
906 |
if ((retval = CheckExecPerm(&r, filp)) < 0) goto out; |
r->mode = mode; |
907 |
|
retval = ccs_check_exec_perm(r, &rn); |
908 |
|
if (retval == 1) |
909 |
|
goto retry; |
910 |
|
if (retval < 0) |
911 |
|
goto out; |
912 |
|
|
913 |
/* Allocate memory for calcurating domain name. */ |
calculate_domain: |
914 |
retval = -ENOMEM; |
new_domain_name = ee->tmp; |
915 |
if ((new_domain_name = ccs_alloc(CCS_MAX_PATHNAME_LEN + 16)) == NULL) goto out; |
if (ccs_is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
916 |
|
/* Transit to the child of ccs_kernel_domain domain. */ |
917 |
if (IsDomainInitializer(old_domain->domainname, &r, &l)) { |
snprintf(new_domain_name, CCS_EXEC_TMPSIZE - 1, |
918 |
/* Transit to the child of KERNEL_DOMAIN domain. */ |
ROOT_NAME " " "%s", ee->program_path); |
919 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, ROOT_NAME " " "%s", real_program_name); |
} else if (r->domain == &ccs_kernel_domain && !ccs_policy_loaded) { |
|
} else if (old_domain == &KERNEL_DOMAIN && !sbin_init_started) { |
|
920 |
/* |
/* |
921 |
* Needn't to transit from kernel domain before starting /sbin/init . |
* Needn't to transit from kernel domain before starting |
922 |
* But transit from kernel domain if executing initializers, for they might start before /sbin/init . |
* /sbin/init. But transit from kernel domain if executing |
923 |
|
* initializers because they might start before /sbin/init. |
924 |
*/ |
*/ |
925 |
domain = old_domain; |
domain = r->domain; |
926 |
} else if (IsDomainKeeper(old_domain->domainname, &r, &l)) { |
} else if (ccs_is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
927 |
/* Keep current domain. */ |
/* Keep current domain. */ |
928 |
domain = old_domain; |
domain = r->domain; |
929 |
} else { |
} else { |
930 |
/* Normal domain transition. */ |
/* Normal domain transition. */ |
931 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, "%s %s", old_domain_name, real_program_name); |
snprintf(new_domain_name, CCS_EXEC_TMPSIZE - 1, |
932 |
} |
"%s %s", old_domain_name, ee->program_path); |
|
if (!domain && strlen(new_domain_name) < CCS_MAX_PATHNAME_LEN) { |
|
|
if (is_enforce) { |
|
|
domain = FindDomain(new_domain_name); |
|
|
if (!domain) if (CheckSupervisor("#Need to create domain\n%s\n", new_domain_name) == 0) domain = FindOrAssignNewDomain(new_domain_name, current->domain_info->profile); |
|
|
} else { |
|
|
domain = FindOrAssignNewDomain(new_domain_name, current->domain_info->profile); |
|
|
} |
|
933 |
} |
} |
934 |
|
if (domain || strlen(new_domain_name) >= CCS_MAX_PATHNAME_LEN) |
935 |
|
goto done; |
936 |
|
domain = ccs_find_domain(new_domain_name); |
937 |
|
if (domain) |
938 |
|
goto done; |
939 |
|
if (is_enforce) { |
940 |
|
int error = ccs_check_supervisor(r, |
941 |
|
"# wants to create domain\n" |
942 |
|
"%s\n", new_domain_name); |
943 |
|
if (error == 1) |
944 |
|
goto retry; |
945 |
|
if (error < 0) |
946 |
|
goto done; |
947 |
|
} |
948 |
|
domain = ccs_find_or_assign_new_domain(new_domain_name, r->profile); |
949 |
|
if (domain) |
950 |
|
ccs_audit_domain_creation_log(r->domain); |
951 |
|
done: |
952 |
if (!domain) { |
if (!domain) { |
953 |
printk("TOMOYO-ERROR: Domain '%s' not defined.\n", new_domain_name); |
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
954 |
if (is_enforce) retval = -EPERM; |
new_domain_name); |
955 |
|
if (is_enforce) |
956 |
|
retval = -EPERM; |
957 |
|
else { |
958 |
|
retval = 0; |
959 |
|
r->domain->domain_transition_failed = true; |
960 |
|
} |
961 |
} else { |
} else { |
962 |
retval = 0; |
retval = 0; |
963 |
} |
} |
964 |
out: ; |
out: |
965 |
ccs_free(new_domain_name); |
if (domain) |
966 |
ccs_free(real_program_name); |
r->domain = domain; |
|
ccs_free(symlink_program_name); |
|
|
*next_domain = domain ? domain : old_domain; |
|
967 |
return retval; |
return retval; |
968 |
} |
} |
969 |
|
|
970 |
|
/** |
971 |
|
* ccs_check_environ - Check permission for environment variable names. |
972 |
|
* |
973 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
974 |
|
* |
975 |
|
* Returns 0 on success, negative value otherwise. |
976 |
|
*/ |
977 |
|
static int ccs_check_environ(struct ccs_execve_entry *ee) |
978 |
|
{ |
979 |
|
struct ccs_request_info *r = &ee->r; |
980 |
|
struct linux_binprm *bprm = ee->bprm; |
981 |
|
char *arg_ptr = ee->tmp; |
982 |
|
int arg_len = 0; |
983 |
|
unsigned long pos = bprm->p; |
984 |
|
int offset = pos % PAGE_SIZE; |
985 |
|
int argv_count = bprm->argc; |
986 |
|
int envp_count = bprm->envc; |
987 |
|
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
988 |
|
int error = -ENOMEM; |
989 |
|
if (!r->mode || !envp_count) |
990 |
|
return 0; |
991 |
|
while (error == -ENOMEM) { |
992 |
|
if (!ccs_dump_page(bprm, pos, &ee->dump)) |
993 |
|
goto out; |
994 |
|
pos += PAGE_SIZE - offset; |
995 |
|
/* Read. */ |
996 |
|
while (argv_count && offset < PAGE_SIZE) { |
997 |
|
const char *kaddr = ee->dump.data; |
998 |
|
if (!kaddr[offset++]) |
999 |
|
argv_count--; |
1000 |
|
} |
1001 |
|
if (argv_count) { |
1002 |
|
offset = 0; |
1003 |
|
continue; |
1004 |
|
} |
1005 |
|
while (offset < PAGE_SIZE) { |
1006 |
|
const char *kaddr = ee->dump.data; |
1007 |
|
const unsigned char c = kaddr[offset++]; |
1008 |
|
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
1009 |
|
if (c == '=') { |
1010 |
|
arg_ptr[arg_len++] = '\0'; |
1011 |
|
} else if (c == '\\') { |
1012 |
|
arg_ptr[arg_len++] = '\\'; |
1013 |
|
arg_ptr[arg_len++] = '\\'; |
1014 |
|
} else if (c > ' ' && c < 127) { |
1015 |
|
arg_ptr[arg_len++] = c; |
1016 |
|
} else { |
1017 |
|
arg_ptr[arg_len++] = '\\'; |
1018 |
|
arg_ptr[arg_len++] = (c >> 6) + '0'; |
1019 |
|
arg_ptr[arg_len++] |
1020 |
|
= ((c >> 3) & 7) + '0'; |
1021 |
|
arg_ptr[arg_len++] = (c & 7) + '0'; |
1022 |
|
} |
1023 |
|
} else { |
1024 |
|
arg_ptr[arg_len] = '\0'; |
1025 |
|
} |
1026 |
|
if (c) |
1027 |
|
continue; |
1028 |
|
if (ccs_check_env_perm(r, arg_ptr)) { |
1029 |
|
error = -EPERM; |
1030 |
|
break; |
1031 |
|
} |
1032 |
|
if (!--envp_count) { |
1033 |
|
error = 0; |
1034 |
|
break; |
1035 |
|
} |
1036 |
|
arg_len = 0; |
1037 |
|
} |
1038 |
|
offset = 0; |
1039 |
|
} |
1040 |
|
out: |
1041 |
|
if (r->mode != 3) |
1042 |
|
error = 0; |
1043 |
|
return error; |
1044 |
|
} |
1045 |
|
|
1046 |
|
/** |
1047 |
|
* ccs_unescape - Unescape escaped string. |
1048 |
|
* |
1049 |
|
* @dest: String to unescape. |
1050 |
|
* |
1051 |
|
* Returns nothing. |
1052 |
|
*/ |
1053 |
|
static void ccs_unescape(unsigned char *dest) |
1054 |
|
{ |
1055 |
|
unsigned char *src = dest; |
1056 |
|
unsigned char c; |
1057 |
|
unsigned char d; |
1058 |
|
unsigned char e; |
1059 |
|
while (1) { |
1060 |
|
c = *src++; |
1061 |
|
if (!c) |
1062 |
|
break; |
1063 |
|
if (c != '\\') { |
1064 |
|
*dest++ = c; |
1065 |
|
continue; |
1066 |
|
} |
1067 |
|
c = *src++; |
1068 |
|
if (c == '\\') { |
1069 |
|
*dest++ = c; |
1070 |
|
continue; |
1071 |
|
} |
1072 |
|
if (c < '0' || c > '3') |
1073 |
|
break; |
1074 |
|
d = *src++; |
1075 |
|
if (d < '0' || d > '7') |
1076 |
|
break; |
1077 |
|
e = *src++; |
1078 |
|
if (e < '0' || e > '7') |
1079 |
|
break; |
1080 |
|
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
1081 |
|
} |
1082 |
|
*dest = '\0'; |
1083 |
|
} |
1084 |
|
|
1085 |
|
/** |
1086 |
|
* ccs_root_depth - Get number of directories to strip. |
1087 |
|
* |
1088 |
|
* @dentry: Pointer to "struct dentry". |
1089 |
|
* @vfsmnt: Pointer to "struct vfsmount". |
1090 |
|
* |
1091 |
|
* Returns number of directories to strip. |
1092 |
|
*/ |
1093 |
|
static inline int ccs_root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
1094 |
|
{ |
1095 |
|
int depth = 0; |
1096 |
|
/***** CRITICAL SECTION START *****/ |
1097 |
|
ccs_realpath_lock(); |
1098 |
|
for (;;) { |
1099 |
|
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
1100 |
|
/* Global root? */ |
1101 |
|
if (vfsmnt->mnt_parent == vfsmnt) |
1102 |
|
break; |
1103 |
|
dentry = vfsmnt->mnt_mountpoint; |
1104 |
|
vfsmnt = vfsmnt->mnt_parent; |
1105 |
|
continue; |
1106 |
|
} |
1107 |
|
dentry = dentry->d_parent; |
1108 |
|
depth++; |
1109 |
|
} |
1110 |
|
ccs_realpath_unlock(); |
1111 |
|
/***** CRITICAL SECTION END *****/ |
1112 |
|
return depth; |
1113 |
|
} |
1114 |
|
|
1115 |
|
/** |
1116 |
|
* ccs_get_root_depth - return the depth of root directory. |
1117 |
|
* |
1118 |
|
* Returns number of directories to strip. |
1119 |
|
*/ |
1120 |
|
static int ccs_get_root_depth(void) |
1121 |
|
{ |
1122 |
|
int depth; |
1123 |
|
struct dentry *dentry; |
1124 |
|
struct vfsmount *vfsmnt; |
1125 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1126 |
|
struct path root; |
1127 |
|
#endif |
1128 |
|
/***** CRITICAL SECTION START *****/ |
1129 |
|
read_lock(¤t->fs->lock); |
1130 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1131 |
|
root = current->fs->root; |
1132 |
|
path_get(¤t->fs->root); |
1133 |
|
dentry = root.dentry; |
1134 |
|
vfsmnt = root.mnt; |
1135 |
|
#else |
1136 |
|
dentry = dget(current->fs->root); |
1137 |
|
vfsmnt = mntget(current->fs->rootmnt); |
1138 |
|
#endif |
1139 |
|
read_unlock(¤t->fs->lock); |
1140 |
|
/***** CRITICAL SECTION END *****/ |
1141 |
|
depth = ccs_root_depth(dentry, vfsmnt); |
1142 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1143 |
|
path_put(&root); |
1144 |
|
#else |
1145 |
|
dput(dentry); |
1146 |
|
mntput(vfsmnt); |
1147 |
#endif |
#endif |
1148 |
|
return depth; |
1149 |
|
} |
1150 |
|
|
1151 |
|
static LIST_HEAD(ccs_execve_list); |
1152 |
|
static DEFINE_SPINLOCK(ccs_execve_list_lock); |
1153 |
|
|
1154 |
|
/** |
1155 |
|
* ccs_allocate_execve_entry - Allocate memory for execve(). |
1156 |
|
* |
1157 |
|
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
1158 |
|
*/ |
1159 |
|
static struct ccs_execve_entry *ccs_allocate_execve_entry(void) |
1160 |
|
{ |
1161 |
|
struct ccs_execve_entry *ee = kzalloc(sizeof(*ee), GFP_KERNEL); |
1162 |
|
if (!ee) |
1163 |
|
return NULL; |
1164 |
|
memset(ee, 0, sizeof(*ee)); |
1165 |
|
ee->program_path = kzalloc(CCS_MAX_PATHNAME_LEN, GFP_KERNEL); |
1166 |
|
ee->tmp = kzalloc(CCS_MAX_PATHNAME_LEN, GFP_KERNEL); |
1167 |
|
if (!ee->program_path || !ee->tmp) { |
1168 |
|
kfree(ee->program_path); |
1169 |
|
kfree(ee->tmp); |
1170 |
|
kfree(ee); |
1171 |
|
return NULL; |
1172 |
|
} |
1173 |
|
ee->srcu_idx = srcu_read_lock(&ccs_ss); |
1174 |
|
/* ee->dump->data is allocated by ccs_dump_page(). */ |
1175 |
|
ee->task = current; |
1176 |
|
/***** CRITICAL SECTION START *****/ |
1177 |
|
spin_lock(&ccs_execve_list_lock); |
1178 |
|
list_add(&ee->list, &ccs_execve_list); |
1179 |
|
spin_unlock(&ccs_execve_list_lock); |
1180 |
|
/***** CRITICAL SECTION END *****/ |
1181 |
|
return ee; |
1182 |
|
} |
1183 |
|
|
1184 |
int search_binary_handler_with_transition(struct linux_binprm *bprm, struct pt_regs *regs) |
/** |
1185 |
|
* ccs_find_execve_entry - Find ccs_execve_entry of current process. |
1186 |
|
* |
1187 |
|
* Returns pointer to "struct ccs_execve_entry" on success, NULL otherwise. |
1188 |
|
*/ |
1189 |
|
static struct ccs_execve_entry *ccs_find_execve_entry(void) |
1190 |
{ |
{ |
1191 |
struct domain_info *next_domain = NULL, *prev_domain = current->domain_info; |
struct task_struct *task = current; |
1192 |
int retval; |
struct ccs_execve_entry *ee = NULL; |
1193 |
#if defined(CONFIG_SAKURA) || defined(CONFIG_TOMOYO) |
struct ccs_execve_entry *p; |
1194 |
extern void CCS_LoadPolicy(const char *filename); |
/***** CRITICAL SECTION START *****/ |
1195 |
CCS_LoadPolicy(bprm->filename); |
spin_lock(&ccs_execve_list_lock); |
1196 |
|
list_for_each_entry(p, &ccs_execve_list, list) { |
1197 |
|
if (p->task != task) |
1198 |
|
continue; |
1199 |
|
ee = p; |
1200 |
|
break; |
1201 |
|
} |
1202 |
|
spin_unlock(&ccs_execve_list_lock); |
1203 |
|
/***** CRITICAL SECTION END *****/ |
1204 |
|
return ee; |
1205 |
|
} |
1206 |
|
|
1207 |
|
/** |
1208 |
|
* ccs_free_execve_entry - Free memory for execve(). |
1209 |
|
* |
1210 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
1211 |
|
*/ |
1212 |
|
static void ccs_free_execve_entry(struct ccs_execve_entry *ee) |
1213 |
|
{ |
1214 |
|
if (!ee) |
1215 |
|
return; |
1216 |
|
/***** CRITICAL SECTION START *****/ |
1217 |
|
spin_lock(&ccs_execve_list_lock); |
1218 |
|
list_del(&ee->list); |
1219 |
|
spin_unlock(&ccs_execve_list_lock); |
1220 |
|
/***** CRITICAL SECTION END *****/ |
1221 |
|
kfree(ee->program_path); |
1222 |
|
kfree(ee->tmp); |
1223 |
|
kfree(ee->dump.data); |
1224 |
|
srcu_read_unlock(&ccs_ss, ee->srcu_idx); |
1225 |
|
kfree(ee); |
1226 |
|
} |
1227 |
|
|
1228 |
|
/** |
1229 |
|
* ccs_try_alt_exec - Try to start execute handler. |
1230 |
|
* |
1231 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
1232 |
|
* |
1233 |
|
* Returns 0 on success, negative value otherwise. |
1234 |
|
*/ |
1235 |
|
static int ccs_try_alt_exec(struct ccs_execve_entry *ee) |
1236 |
|
{ |
1237 |
|
/* |
1238 |
|
* Contents of modified bprm. |
1239 |
|
* The envp[] in original bprm is moved to argv[] so that |
1240 |
|
* the alternatively executed program won't be affected by |
1241 |
|
* some dangerous environment variables like LD_PRELOAD. |
1242 |
|
* |
1243 |
|
* modified bprm->argc |
1244 |
|
* = original bprm->argc + original bprm->envc + 7 |
1245 |
|
* modified bprm->envc |
1246 |
|
* = 0 |
1247 |
|
* |
1248 |
|
* modified bprm->argv[0] |
1249 |
|
* = the program's name specified by execute_handler |
1250 |
|
* modified bprm->argv[1] |
1251 |
|
* = ccs_current_domain()->domainname->name |
1252 |
|
* modified bprm->argv[2] |
1253 |
|
* = the current process's name |
1254 |
|
* modified bprm->argv[3] |
1255 |
|
* = the current process's information (e.g. uid/gid). |
1256 |
|
* modified bprm->argv[4] |
1257 |
|
* = original bprm->filename |
1258 |
|
* modified bprm->argv[5] |
1259 |
|
* = original bprm->argc in string expression |
1260 |
|
* modified bprm->argv[6] |
1261 |
|
* = original bprm->envc in string expression |
1262 |
|
* modified bprm->argv[7] |
1263 |
|
* = original bprm->argv[0] |
1264 |
|
* ... |
1265 |
|
* modified bprm->argv[bprm->argc + 6] |
1266 |
|
* = original bprm->argv[bprm->argc - 1] |
1267 |
|
* modified bprm->argv[bprm->argc + 7] |
1268 |
|
* = original bprm->envp[0] |
1269 |
|
* ... |
1270 |
|
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
1271 |
|
* = original bprm->envp[bprm->envc - 1] |
1272 |
|
*/ |
1273 |
|
struct linux_binprm *bprm = ee->bprm; |
1274 |
|
struct file *filp; |
1275 |
|
int retval; |
1276 |
|
const int original_argc = bprm->argc; |
1277 |
|
const int original_envc = bprm->envc; |
1278 |
|
struct task_struct *task = current; |
1279 |
|
|
1280 |
|
/* Close the requested program's dentry. */ |
1281 |
|
allow_write_access(bprm->file); |
1282 |
|
fput(bprm->file); |
1283 |
|
bprm->file = NULL; |
1284 |
|
|
1285 |
|
/* Invalidate page dump cache. */ |
1286 |
|
ee->dump.page = NULL; |
1287 |
|
|
1288 |
|
/* Move envp[] to argv[] */ |
1289 |
|
bprm->argc += bprm->envc; |
1290 |
|
bprm->envc = 0; |
1291 |
|
|
1292 |
|
/* Set argv[6] */ |
1293 |
|
{ |
1294 |
|
char *cp = ee->tmp; |
1295 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); |
1296 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
1297 |
|
if (retval < 0) |
1298 |
|
goto out; |
1299 |
|
bprm->argc++; |
1300 |
|
} |
1301 |
|
|
1302 |
|
/* Set argv[5] */ |
1303 |
|
{ |
1304 |
|
char *cp = ee->tmp; |
1305 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); |
1306 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
1307 |
|
if (retval < 0) |
1308 |
|
goto out; |
1309 |
|
bprm->argc++; |
1310 |
|
} |
1311 |
|
|
1312 |
|
/* Set argv[4] */ |
1313 |
|
{ |
1314 |
|
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
1315 |
|
if (retval < 0) |
1316 |
|
goto out; |
1317 |
|
bprm->argc++; |
1318 |
|
} |
1319 |
|
|
1320 |
|
/* Set argv[3] */ |
1321 |
|
{ |
1322 |
|
char *cp = ee->tmp; |
1323 |
|
const u32 ccs_flags = task->ccs_flags; |
1324 |
|
snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, |
1325 |
|
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
1326 |
|
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
1327 |
|
"state[1]=%u state[2]=%u", |
1328 |
|
(pid_t) sys_getpid(), current_uid(), current_gid(), |
1329 |
|
current_euid(), current_egid(), current_suid(), |
1330 |
|
current_sgid(), current_fsuid(), current_fsgid(), |
1331 |
|
(u8) (ccs_flags >> 24), (u8) (ccs_flags >> 16), |
1332 |
|
(u8) (ccs_flags >> 8)); |
1333 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
1334 |
|
if (retval < 0) |
1335 |
|
goto out; |
1336 |
|
bprm->argc++; |
1337 |
|
} |
1338 |
|
|
1339 |
|
/* Set argv[2] */ |
1340 |
|
{ |
1341 |
|
char *exe = (char *) ccs_get_exe(); |
1342 |
|
if (exe) { |
1343 |
|
retval = copy_strings_kernel(1, &exe, bprm); |
1344 |
|
kfree(exe); |
1345 |
|
} else { |
1346 |
|
exe = ee->tmp; |
1347 |
|
strncpy(ee->tmp, "<unknown>", CCS_EXEC_TMPSIZE - 1); |
1348 |
|
retval = copy_strings_kernel(1, &exe, bprm); |
1349 |
|
} |
1350 |
|
if (retval < 0) |
1351 |
|
goto out; |
1352 |
|
bprm->argc++; |
1353 |
|
} |
1354 |
|
|
1355 |
|
/* Set argv[1] */ |
1356 |
|
{ |
1357 |
|
char *cp = ee->tmp; |
1358 |
|
strncpy(ee->tmp, ccs_current_domain()->domainname->name, |
1359 |
|
CCS_EXEC_TMPSIZE - 1); |
1360 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
1361 |
|
if (retval < 0) |
1362 |
|
goto out; |
1363 |
|
bprm->argc++; |
1364 |
|
} |
1365 |
|
|
1366 |
|
/* Set argv[0] */ |
1367 |
|
{ |
1368 |
|
int depth = ccs_get_root_depth(); |
1369 |
|
char *cp = ee->program_path; |
1370 |
|
strncpy(cp, ee->handler->name, CCS_MAX_PATHNAME_LEN - 1); |
1371 |
|
ccs_unescape(cp); |
1372 |
|
retval = -ENOENT; |
1373 |
|
if (!*cp || *cp != '/') |
1374 |
|
goto out; |
1375 |
|
/* Adjust root directory for open_exec(). */ |
1376 |
|
while (depth) { |
1377 |
|
cp = strchr(cp + 1, '/'); |
1378 |
|
if (!cp) |
1379 |
|
goto out; |
1380 |
|
depth--; |
1381 |
|
} |
1382 |
|
memmove(ee->program_path, cp, strlen(cp) + 1); |
1383 |
|
cp = ee->program_path; |
1384 |
|
retval = copy_strings_kernel(1, &cp, bprm); |
1385 |
|
if (retval < 0) |
1386 |
|
goto out; |
1387 |
|
bprm->argc++; |
1388 |
|
} |
1389 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
1390 |
|
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
1391 |
|
bprm->argv_len = bprm->exec - bprm->p; |
1392 |
|
#endif |
1393 |
|
#endif |
1394 |
|
|
1395 |
|
/* OK, now restart the process with execute handler program's dentry. */ |
1396 |
|
filp = open_exec(ee->program_path); |
1397 |
|
if (IS_ERR(filp)) { |
1398 |
|
retval = PTR_ERR(filp); |
1399 |
|
goto out; |
1400 |
|
} |
1401 |
|
bprm->file = filp; |
1402 |
|
bprm->filename = ee->program_path; |
1403 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1404 |
|
bprm->interp = bprm->filename; |
1405 |
#endif |
#endif |
1406 |
#if defined(CONFIG_TOMOYO) |
retval = prepare_binprm(bprm); |
1407 |
retval = FindNextDomain(bprm, &next_domain); |
if (retval < 0) |
1408 |
|
goto out; |
1409 |
|
{ |
1410 |
|
/* |
1411 |
|
* Backup ee->program_path because ccs_find_next_domain() will |
1412 |
|
* overwrite ee->program_path and ee->tmp. |
1413 |
|
*/ |
1414 |
|
const int len = strlen(ee->program_path) + 1; |
1415 |
|
char *cp = kzalloc(len, GFP_KERNEL); |
1416 |
|
if (!cp) { |
1417 |
|
retval = -ENOMEM; |
1418 |
|
goto out; |
1419 |
|
} |
1420 |
|
memmove(cp, ee->program_path, len); |
1421 |
|
bprm->filename = cp; |
1422 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1423 |
|
bprm->interp = bprm->filename; |
1424 |
|
#endif |
1425 |
|
task->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1426 |
|
retval = ccs_find_next_domain(ee); |
1427 |
|
task->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1428 |
|
/* Restore ee->program_path for search_binary_handler(). */ |
1429 |
|
memmove(ee->program_path, cp, len); |
1430 |
|
bprm->filename = ee->program_path; |
1431 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1432 |
|
bprm->interp = bprm->filename; |
1433 |
|
#endif |
1434 |
|
kfree(cp); |
1435 |
|
} |
1436 |
|
out: |
1437 |
|
return retval; |
1438 |
|
} |
1439 |
|
|
1440 |
|
/** |
1441 |
|
* ccs_find_execute_handler - Find an execute handler. |
1442 |
|
* |
1443 |
|
* @ee: Pointer to "struct ccs_execve_entry". |
1444 |
|
* @type: Type of execute handler. |
1445 |
|
* |
1446 |
|
* Returns true if found, false otherwise. |
1447 |
|
* |
1448 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
1449 |
|
*/ |
1450 |
|
static bool ccs_find_execute_handler(struct ccs_execve_entry *ee, |
1451 |
|
const u8 type) |
1452 |
|
{ |
1453 |
|
struct task_struct *task = current; |
1454 |
|
const struct ccs_domain_info *domain = ccs_current_domain(); |
1455 |
|
struct ccs_acl_info *ptr; |
1456 |
|
bool found = false; |
1457 |
|
/* |
1458 |
|
* Don't use execute handler if the current process is |
1459 |
|
* marked as execute handler to avoid infinite execute handler loop. |
1460 |
|
*/ |
1461 |
|
if (task->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER) |
1462 |
|
return false; |
1463 |
|
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
1464 |
|
struct ccs_execute_handler_record *acl; |
1465 |
|
if (ptr->type != type) |
1466 |
|
continue; |
1467 |
|
acl = container_of(ptr, struct ccs_execute_handler_record, |
1468 |
|
head); |
1469 |
|
ee->handler = acl->handler; |
1470 |
|
found = true; |
1471 |
|
break; |
1472 |
|
} |
1473 |
|
return found; |
1474 |
|
} |
1475 |
|
|
1476 |
|
/** |
1477 |
|
* ccs_dump_page - Dump a page to buffer. |
1478 |
|
* |
1479 |
|
* @bprm: Pointer to "struct linux_binprm". |
1480 |
|
* @pos: Location to dump. |
1481 |
|
* @dump: Poiner to "struct ccs_page_dump". |
1482 |
|
* |
1483 |
|
* Returns true on success, false otherwise. |
1484 |
|
*/ |
1485 |
|
bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, |
1486 |
|
struct ccs_page_dump *dump) |
1487 |
|
{ |
1488 |
|
struct page *page; |
1489 |
|
/* dump->data is released by ccs_free_execve_entry(). */ |
1490 |
|
if (!dump->data) { |
1491 |
|
dump->data = kzalloc(PAGE_SIZE, GFP_KERNEL); |
1492 |
|
if (!dump->data) |
1493 |
|
return false; |
1494 |
|
} |
1495 |
|
/* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ |
1496 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1497 |
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1498 |
|
return false; |
1499 |
|
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
1500 |
|
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) |
1501 |
|
return false; |
1502 |
#else |
#else |
1503 |
retval = 0; next_domain = prev_domain; |
page = bprm->page[pos / PAGE_SIZE]; |
1504 |
|
#endif |
1505 |
|
if (page != dump->page) { |
1506 |
|
const unsigned int offset = pos % PAGE_SIZE; |
1507 |
|
/* |
1508 |
|
* Maybe kmap()/kunmap() should be used here. |
1509 |
|
* But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). |
1510 |
|
* So do I. |
1511 |
|
*/ |
1512 |
|
char *kaddr = kmap_atomic(page, KM_USER0); |
1513 |
|
dump->page = page; |
1514 |
|
memcpy(dump->data + offset, kaddr + offset, PAGE_SIZE - offset); |
1515 |
|
kunmap_atomic(kaddr, KM_USER0); |
1516 |
|
} |
1517 |
|
/* Same with put_arg_page(page) in fs/exec.c */ |
1518 |
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1519 |
|
put_page(page); |
1520 |
|
#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR == 3 && defined(CONFIG_MMU) |
1521 |
|
put_page(page); |
1522 |
#endif |
#endif |
1523 |
if (retval == 0) { |
return true; |
1524 |
current->tomoyo_flags |= TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
} |
1525 |
current->domain_info = next_domain; |
|
1526 |
retval = search_binary_handler(bprm, regs); |
/** |
1527 |
if (retval < 0) current->domain_info = prev_domain; |
* ccs_fetch_next_domain - Fetch next_domain from the list. |
1528 |
current->tomoyo_flags &= ~TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
* |
1529 |
|
* Returns pointer to "struct ccs_domain_info" which will be used if execve() |
1530 |
|
* succeeds. This function does not return NULL. |
1531 |
|
*/ |
1532 |
|
struct ccs_domain_info *ccs_fetch_next_domain(void) |
1533 |
|
{ |
1534 |
|
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
1535 |
|
struct ccs_domain_info *next_domain = NULL; |
1536 |
|
if (ee) |
1537 |
|
next_domain = ee->r.domain; |
1538 |
|
if (!next_domain) |
1539 |
|
next_domain = ccs_current_domain(); |
1540 |
|
return next_domain; |
1541 |
|
} |
1542 |
|
|
1543 |
|
/** |
1544 |
|
* ccs_start_execve - Prepare for execve() operation. |
1545 |
|
* |
1546 |
|
* @bprm: Pointer to "struct linux_binprm". |
1547 |
|
* |
1548 |
|
* Returns 0 on success, negative value otherwise. |
1549 |
|
*/ |
1550 |
|
int ccs_start_execve(struct linux_binprm *bprm) |
1551 |
|
{ |
1552 |
|
int retval; |
1553 |
|
struct task_struct *task = current; |
1554 |
|
struct ccs_execve_entry *ee = ccs_allocate_execve_entry(); |
1555 |
|
if (!ccs_policy_loaded) |
1556 |
|
ccs_load_policy(bprm->filename); |
1557 |
|
if (!ee) |
1558 |
|
return -ENOMEM; |
1559 |
|
ccs_init_request_info(&ee->r, NULL, CCS_MAC_FOR_FILE); |
1560 |
|
ee->r.ee = ee; |
1561 |
|
ee->bprm = bprm; |
1562 |
|
ee->r.obj = &ee->obj; |
1563 |
|
ee->obj.path1_dentry = bprm->file->f_dentry; |
1564 |
|
ee->obj.path1_vfsmnt = bprm->file->f_vfsmnt; |
1565 |
|
/* Clear manager flag. */ |
1566 |
|
task->ccs_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1567 |
|
if (ccs_find_execute_handler(ee, TYPE_EXECUTE_HANDLER)) { |
1568 |
|
retval = ccs_try_alt_exec(ee); |
1569 |
|
if (!retval) |
1570 |
|
ccs_audit_execute_handler_log(ee, true); |
1571 |
|
goto ok; |
1572 |
|
} |
1573 |
|
retval = ccs_find_next_domain(ee); |
1574 |
|
if (retval != -EPERM) |
1575 |
|
goto ok; |
1576 |
|
if (ccs_find_execute_handler(ee, TYPE_DENIED_EXECUTE_HANDLER)) { |
1577 |
|
retval = ccs_try_alt_exec(ee); |
1578 |
|
if (!retval) |
1579 |
|
ccs_audit_execute_handler_log(ee, false); |
1580 |
} |
} |
1581 |
|
ok: |
1582 |
|
if (retval < 0) |
1583 |
|
goto out; |
1584 |
|
ee->r.mode = ccs_check_flags(ee->r.domain, CCS_MAC_FOR_ENV); |
1585 |
|
retval = ccs_check_environ(ee); |
1586 |
|
if (retval < 0) |
1587 |
|
goto out; |
1588 |
|
task->ccs_flags |= CCS_CHECK_READ_FOR_OPEN_EXEC; |
1589 |
|
retval = 0; |
1590 |
|
out: |
1591 |
|
if (retval) |
1592 |
|
ccs_finish_execve(retval); |
1593 |
return retval; |
return retval; |
1594 |
} |
} |
1595 |
|
|
1596 |
/***** TOMOYO Linux end. *****/ |
/** |
1597 |
|
* ccs_finish_execve - Clean up execve() operation. |
1598 |
|
* |
1599 |
|
* @retval: Return code of an execve() operation. |
1600 |
|
* |
1601 |
|
* Caller holds srcu_read_lock(&ccs_ss). |
1602 |
|
*/ |
1603 |
|
void ccs_finish_execve(int retval) |
1604 |
|
{ |
1605 |
|
struct task_struct *task = current; |
1606 |
|
struct ccs_execve_entry *ee = ccs_find_execve_entry(); |
1607 |
|
task->ccs_flags &= ~CCS_CHECK_READ_FOR_OPEN_EXEC; |
1608 |
|
if (!ee) |
1609 |
|
return; |
1610 |
|
if (retval < 0) |
1611 |
|
goto out; |
1612 |
|
/* Proceed to next domain if execution suceeded. */ |
1613 |
|
task->ccs_domain_info = ee->r.domain; |
1614 |
|
/* Mark the current process as execute handler. */ |
1615 |
|
if (ee->handler) |
1616 |
|
task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; |
1617 |
|
/* Mark the current process as normal process. */ |
1618 |
|
else |
1619 |
|
task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; |
1620 |
|
out: |
1621 |
|
ccs_free_execve_entry(ee); |
1622 |
|
} |