1 /*
2 * security/tomoyo/environ.c
3 *
4 * Copyright (C) 2005-2011 NTT DATA CORPORATION
5 */
6
7 #include "common.h"
8
9 /**
10 * tomoyo_check_env_acl - Check permission for environment variable's name.
11 *
12 * @r: Pointer to "struct tomoyo_request_info".
13 * @ptr: Pointer to "struct tomoyo_acl_info".
14 *
15 * Returns true if granted, false otherwise.
16 */
tomoyo_check_env_acl(struct tomoyo_request_info * r,const struct tomoyo_acl_info * ptr)17 static bool tomoyo_check_env_acl(struct tomoyo_request_info *r,
18 const struct tomoyo_acl_info *ptr)
19 {
20 const struct tomoyo_env_acl *acl =
21 container_of(ptr, typeof(*acl), head);
22
23 return tomoyo_path_matches_pattern(r->param.environ.name, acl->env);
24 }
25
26 /**
27 * tomoyo_audit_env_log - Audit environment variable name log.
28 *
29 * @r: Pointer to "struct tomoyo_request_info".
30 *
31 * Returns 0 on success, negative value otherwise.
32 */
tomoyo_audit_env_log(struct tomoyo_request_info * r)33 static int tomoyo_audit_env_log(struct tomoyo_request_info *r)
34 {
35 return tomoyo_supervisor(r, "misc env %s\n",
36 r->param.environ.name->name);
37 }
38
39 /**
40 * tomoyo_env_perm - Check permission for environment variable's name.
41 *
42 * @r: Pointer to "struct tomoyo_request_info".
43 * @env: The name of environment variable.
44 *
45 * Returns 0 on success, negative value otherwise.
46 *
47 * Caller holds tomoyo_read_lock().
48 */
tomoyo_env_perm(struct tomoyo_request_info * r,const char * env)49 int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env)
50 {
51 struct tomoyo_path_info environ;
52 int error;
53
54 if (!env || !*env)
55 return 0;
56 environ.name = env;
57 tomoyo_fill_path_info(&environ);
58 r->param_type = TOMOYO_TYPE_ENV_ACL;
59 r->param.environ.name = &environ;
60 do {
61 tomoyo_check_acl(r, tomoyo_check_env_acl);
62 error = tomoyo_audit_env_log(r);
63 } while (error == TOMOYO_RETRY_REQUEST);
64 return error;
65 }
66
67 /**
68 * tomoyo_same_env_acl - Check for duplicated "struct tomoyo_env_acl" entry.
69 *
70 * @a: Pointer to "struct tomoyo_acl_info".
71 * @b: Pointer to "struct tomoyo_acl_info".
72 *
73 * Returns true if @a == @b, false otherwise.
74 */
tomoyo_same_env_acl(const struct tomoyo_acl_info * a,const struct tomoyo_acl_info * b)75 static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a,
76 const struct tomoyo_acl_info *b)
77 {
78 const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head);
79 const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head);
80
81 return p1->env == p2->env;
82 }
83
84 /**
85 * tomoyo_write_env - Write "struct tomoyo_env_acl" list.
86 *
87 * @param: Pointer to "struct tomoyo_acl_param".
88 *
89 * Returns 0 on success, negative value otherwise.
90 *
91 * Caller holds tomoyo_read_lock().
92 */
tomoyo_write_env(struct tomoyo_acl_param * param)93 static int tomoyo_write_env(struct tomoyo_acl_param *param)
94 {
95 struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL };
96 int error = -ENOMEM;
97 const char *data = tomoyo_read_token(param);
98
99 if (!tomoyo_correct_word(data) || strchr(data, '='))
100 return -EINVAL;
101 e.env = tomoyo_get_name(data);
102 if (!e.env)
103 return error;
104 error = tomoyo_update_domain(&e.head, sizeof(e), param,
105 tomoyo_same_env_acl, NULL);
106 tomoyo_put_name(e.env);
107 return error;
108 }
109
110 /**
111 * tomoyo_write_misc - Update environment variable list.
112 *
113 * @param: Pointer to "struct tomoyo_acl_param".
114 *
115 * Returns 0 on success, negative value otherwise.
116 */
tomoyo_write_misc(struct tomoyo_acl_param * param)117 int tomoyo_write_misc(struct tomoyo_acl_param *param)
118 {
119 if (tomoyo_str_starts(¶m->data, "env "))
120 return tomoyo_write_env(param);
121 return -EINVAL;
122 }
123