1 |
kumaneko |
111 |
/* |
2 |
|
|
* fs/tomoyo_signal.c |
3 |
|
|
* |
4 |
|
|
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
|
|
* |
6 |
kumaneko |
851 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
7 |
kumaneko |
111 |
* |
8 |
kumaneko |
1264 |
* Version: 1.6.2-pre 2008/06/07 |
9 |
kumaneko |
111 |
* |
10 |
|
|
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
|
|
* See README.ccs for ChangeLog. |
12 |
|
|
* |
13 |
|
|
*/ |
14 |
|
|
|
15 |
|
|
#include <linux/ccs_common.h> |
16 |
|
|
#include <linux/tomoyo.h> |
17 |
|
|
#include <linux/realpath.h> |
18 |
kumaneko |
964 |
#include <linux/version.h> |
19 |
kumaneko |
1052 |
|
20 |
|
|
/* To support PID namespace. */ |
21 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) |
22 |
kumaneko |
964 |
#define find_task_by_pid find_task_by_vpid |
23 |
|
|
#endif |
24 |
kumaneko |
111 |
|
25 |
kumaneko |
1052 |
/** |
26 |
|
|
* audit_signal_log - Audit signal log. |
27 |
|
|
* |
28 |
|
|
* @signal: Signal number. |
29 |
|
|
* @dest_domain: Destination domainname. |
30 |
|
|
* @is_granted: True if this is a granted log. |
31 |
kumaneko |
1064 |
* @profile: Profile number used. |
32 |
|
|
* @mode: Access control mode used. |
33 |
kumaneko |
1052 |
* |
34 |
|
|
* Returns 0 on success, negative value otherwise. |
35 |
|
|
*/ |
36 |
|
|
static int audit_signal_log(const int signal, |
37 |
|
|
const struct path_info *dest_domain, |
38 |
|
|
const bool is_granted, const u8 profile, |
39 |
|
|
const u8 mode) |
40 |
kumaneko |
111 |
{ |
41 |
|
|
char *buf; |
42 |
|
|
int len; |
43 |
kumaneko |
1064 |
int len2; |
44 |
kumaneko |
1052 |
if (ccs_can_save_audit_log(is_granted) < 0) |
45 |
|
|
return -ENOMEM; |
46 |
kumaneko |
1064 |
len = dest_domain->total_len + 64; |
47 |
kumaneko |
1052 |
buf = ccs_init_audit_log(&len, profile, mode, NULL); |
48 |
|
|
if (!buf) |
49 |
|
|
return -ENOMEM; |
50 |
kumaneko |
1064 |
len2 = strlen(buf); |
51 |
|
|
snprintf(buf + len2, len - len2 - 1, KEYWORD_ALLOW_SIGNAL "%d %s\n", |
52 |
|
|
signal, dest_domain->name); |
53 |
kumaneko |
1052 |
return ccs_write_audit_log(buf, is_granted); |
54 |
kumaneko |
111 |
} |
55 |
|
|
|
56 |
kumaneko |
1052 |
/** |
57 |
|
|
* update_signal_acl - Update "struct signal_acl_record" list. |
58 |
|
|
* |
59 |
|
|
* @sig: Signal number. |
60 |
|
|
* @dest_pattern: Destination domainname. |
61 |
|
|
* @domain: Pointer to "struct domain_info". |
62 |
|
|
* @condition: Pointer to "struct condition_list". May be NULL. |
63 |
|
|
* @is_delete: True if it is a delete request. |
64 |
|
|
* |
65 |
|
|
* Returns 0 on success, negative value otherwise. |
66 |
|
|
*/ |
67 |
|
|
static int update_signal_acl(const int sig, const char *dest_pattern, |
68 |
|
|
struct domain_info *domain, |
69 |
|
|
const struct condition_list *condition, |
70 |
|
|
const bool is_delete) |
71 |
kumaneko |
111 |
{ |
72 |
|
|
struct acl_info *ptr; |
73 |
kumaneko |
708 |
struct signal_acl_record *acl; |
74 |
kumaneko |
111 |
const struct path_info *saved_dest_pattern; |
75 |
|
|
const u16 hash = sig; |
76 |
|
|
int error = -ENOMEM; |
77 |
kumaneko |
1052 |
if (!domain) |
78 |
|
|
return -EINVAL; |
79 |
|
|
if (!dest_pattern || !ccs_is_correct_domain(dest_pattern, __func__)) |
80 |
|
|
return -EINVAL; |
81 |
|
|
saved_dest_pattern = ccs_save_name(dest_pattern); |
82 |
|
|
if (!saved_dest_pattern) |
83 |
|
|
return -ENOMEM; |
84 |
kumaneko |
652 |
mutex_lock(&domain_acl_lock); |
85 |
kumaneko |
1052 |
if (is_delete) |
86 |
|
|
goto delete; |
87 |
|
|
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
88 |
kumaneko |
1064 |
if (ccs_acl_type1(ptr) != TYPE_SIGNAL_ACL) |
89 |
kumaneko |
1052 |
continue; |
90 |
|
|
if (ccs_get_condition_part(ptr) != condition) |
91 |
|
|
continue; |
92 |
|
|
acl = container_of(ptr, struct signal_acl_record, head); |
93 |
|
|
if (acl->sig != hash || |
94 |
|
|
ccs_pathcmp(acl->domainname, saved_dest_pattern)) |
95 |
|
|
continue; |
96 |
|
|
error = ccs_add_domain_acl(NULL, ptr); |
97 |
|
|
goto out; |
98 |
kumaneko |
111 |
} |
99 |
kumaneko |
1052 |
/* Not found. Append it to the tail. */ |
100 |
|
|
acl = ccs_alloc_acl_element(TYPE_SIGNAL_ACL, condition); |
101 |
|
|
if (!acl) |
102 |
|
|
goto out; |
103 |
|
|
acl->sig = hash; |
104 |
|
|
acl->domainname = saved_dest_pattern; |
105 |
|
|
error = ccs_add_domain_acl(domain, &acl->head); |
106 |
|
|
goto out; |
107 |
|
|
delete: |
108 |
|
|
error = -ENOENT; |
109 |
|
|
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
110 |
kumaneko |
1064 |
if (ccs_acl_type2(ptr) != TYPE_SIGNAL_ACL) |
111 |
kumaneko |
1052 |
continue; |
112 |
|
|
if (ccs_get_condition_part(ptr) != condition) |
113 |
|
|
continue; |
114 |
|
|
acl = container_of(ptr, struct signal_acl_record, head); |
115 |
|
|
if (acl->sig != hash || |
116 |
|
|
ccs_pathcmp(acl->domainname, saved_dest_pattern)) |
117 |
|
|
continue; |
118 |
|
|
error = ccs_del_domain_acl(ptr); |
119 |
|
|
break; |
120 |
|
|
} |
121 |
|
|
out: |
122 |
kumaneko |
652 |
mutex_unlock(&domain_acl_lock); |
123 |
kumaneko |
111 |
return error; |
124 |
|
|
} |
125 |
|
|
|
126 |
kumaneko |
1052 |
/** |
127 |
|
|
* ccs_check_signal_acl - Check permission for signal. |
128 |
|
|
* |
129 |
|
|
* @sig: Signal number. |
130 |
|
|
* @pid: Target's PID. |
131 |
|
|
* |
132 |
|
|
* Returns 0 on success, negative value otherwise. |
133 |
|
|
*/ |
134 |
|
|
int ccs_check_signal_acl(const int sig, const int pid) |
135 |
kumaneko |
111 |
{ |
136 |
|
|
struct domain_info *domain = current->domain_info; |
137 |
|
|
struct domain_info *dest = NULL; |
138 |
|
|
const char *dest_pattern; |
139 |
|
|
struct acl_info *ptr; |
140 |
|
|
const u16 hash = sig; |
141 |
kumaneko |
815 |
const u8 profile = current->domain_info->profile; |
142 |
kumaneko |
1052 |
const u8 mode = ccs_check_flags(CCS_TOMOYO_MAC_FOR_SIGNAL); |
143 |
kumaneko |
815 |
const bool is_enforce = (mode == 3); |
144 |
kumaneko |
1016 |
bool found = false; |
145 |
kumaneko |
1052 |
if (!mode) |
146 |
|
|
return 0; |
147 |
|
|
if (!sig) |
148 |
|
|
return 0; /* No check for NULL signal. */ |
149 |
kumaneko |
111 |
if (current->pid == pid) { |
150 |
kumaneko |
1064 |
audit_signal_log(sig, domain->domainname, true, profile, mode); |
151 |
|
|
return 0; /* No check for self process. */ |
152 |
kumaneko |
111 |
} |
153 |
|
|
{ /* Simplified checking. */ |
154 |
|
|
struct task_struct *p = NULL; |
155 |
kumaneko |
1064 |
/***** CRITICAL SECTION START *****/ |
156 |
kumaneko |
111 |
read_lock(&tasklist_lock); |
157 |
kumaneko |
1052 |
if (pid > 0) |
158 |
|
|
p = find_task_by_pid((pid_t) pid); |
159 |
|
|
else if (pid == 0) |
160 |
|
|
p = current; |
161 |
|
|
else if (pid == -1) |
162 |
|
|
dest = &KERNEL_DOMAIN; |
163 |
|
|
else |
164 |
|
|
p = find_task_by_pid((pid_t) -pid); |
165 |
|
|
if (p) |
166 |
|
|
dest = p->domain_info; |
167 |
kumaneko |
111 |
read_unlock(&tasklist_lock); |
168 |
kumaneko |
1064 |
/***** CRITICAL SECTION END *****/ |
169 |
kumaneko |
1052 |
if (!dest) |
170 |
|
|
return 0; /* I can't find destinatioin. */ |
171 |
kumaneko |
111 |
} |
172 |
|
|
if (domain == dest) { |
173 |
kumaneko |
1064 |
audit_signal_log(sig, dest->domainname, true, profile, mode); |
174 |
|
|
return 0; /* No check for self domain. */ |
175 |
kumaneko |
111 |
} |
176 |
|
|
dest_pattern = dest->domainname->name; |
177 |
kumaneko |
722 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
178 |
kumaneko |
708 |
struct signal_acl_record *acl; |
179 |
kumaneko |
1064 |
if (ccs_acl_type2(ptr) != TYPE_SIGNAL_ACL) |
180 |
kumaneko |
1052 |
continue; |
181 |
kumaneko |
912 |
acl = container_of(ptr, struct signal_acl_record, head); |
182 |
kumaneko |
1052 |
if (acl->sig == hash && ccs_check_condition(ptr, NULL)) { |
183 |
kumaneko |
708 |
const int len = acl->domainname->total_len; |
184 |
kumaneko |
1052 |
if (strncmp(acl->domainname->name, dest_pattern, len)) |
185 |
|
|
continue; |
186 |
kumaneko |
1064 |
switch (dest_pattern[len]) { |
187 |
|
|
case ' ': |
188 |
|
|
case '\0': |
189 |
|
|
break; |
190 |
|
|
default: |
191 |
kumaneko |
1052 |
continue; |
192 |
kumaneko |
1064 |
} |
193 |
kumaneko |
1052 |
ccs_update_condition(ptr); |
194 |
kumaneko |
1016 |
found = true; |
195 |
kumaneko |
856 |
break; |
196 |
kumaneko |
111 |
} |
197 |
|
|
} |
198 |
kumaneko |
1052 |
audit_signal_log(sig, dest->domainname, found, profile, mode); |
199 |
|
|
if (found) |
200 |
|
|
return 0; |
201 |
|
|
if (ccs_verbose_mode()) |
202 |
|
|
printk(KERN_WARNING "TOMOYO-%s: Signal %d " |
203 |
|
|
"to %s denied for %s\n", ccs_get_msg(is_enforce), sig, |
204 |
|
|
ccs_get_last_name(dest), ccs_get_last_name(domain)); |
205 |
|
|
if (is_enforce) |
206 |
kumaneko |
1260 |
return ccs_check_supervisor(NULL, KEYWORD_ALLOW_SIGNAL |
207 |
|
|
"%d %s\n", sig, dest_pattern); |
208 |
kumaneko |
1064 |
if (mode == 1 && ccs_check_domain_quota(domain)) |
209 |
|
|
update_signal_acl(sig, dest_pattern, domain, NULL, false); |
210 |
kumaneko |
111 |
return 0; |
211 |
|
|
} |
212 |
|
|
|
213 |
kumaneko |
1052 |
/** |
214 |
|
|
* ccs_write_signal_policy - Write "struct signal_acl_record" list. |
215 |
|
|
* |
216 |
|
|
* @data: String to parse. |
217 |
|
|
* @domain: Pointer to "struct domain_info". |
218 |
|
|
* @condition: Pointer to "struct condition_list". May be NULL. |
219 |
|
|
* @is_delete: True if it is a delete request. |
220 |
|
|
* |
221 |
|
|
* Returns 0 on success, negative value otherwise. |
222 |
|
|
*/ |
223 |
|
|
int ccs_write_signal_policy(char *data, struct domain_info *domain, |
224 |
|
|
const struct condition_list *condition, |
225 |
|
|
const bool is_delete) |
226 |
kumaneko |
111 |
{ |
227 |
|
|
int sig; |
228 |
|
|
char *domainname = strchr(data, ' '); |
229 |
kumaneko |
1052 |
if (sscanf(data, "%d", &sig) == 1 && domainname && |
230 |
|
|
ccs_is_domain_def(domainname + 1)) |
231 |
|
|
return update_signal_acl(sig, domainname + 1, domain, |
232 |
|
|
condition, is_delete); |
233 |
kumaneko |
111 |
return -EINVAL; |
234 |
|
|
} |