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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d58e0da8 TH |
2 | /* |
3 | * security/tomoyo/environ.c | |
4 | * | |
5 | * Copyright (C) 2005-2011 NTT DATA CORPORATION | |
6 | */ | |
7 | ||
8 | #include "common.h" | |
9 | ||
10 | /** | |
11 | * tomoyo_check_env_acl - Check permission for environment variable's name. | |
12 | * | |
13 | * @r: Pointer to "struct tomoyo_request_info". | |
14 | * @ptr: Pointer to "struct tomoyo_acl_info". | |
15 | * | |
16 | * Returns true if granted, false otherwise. | |
17 | */ | |
18 | static bool tomoyo_check_env_acl(struct tomoyo_request_info *r, | |
19 | const struct tomoyo_acl_info *ptr) | |
20 | { | |
21 | const struct tomoyo_env_acl *acl = | |
22 | container_of(ptr, typeof(*acl), head); | |
23 | ||
24 | return tomoyo_path_matches_pattern(r->param.environ.name, acl->env); | |
25 | } | |
26 | ||
27 | /** | |
28 | * tomoyo_audit_env_log - Audit environment variable name log. | |
29 | * | |
30 | * @r: Pointer to "struct tomoyo_request_info". | |
31 | * | |
32 | * Returns 0 on success, negative value otherwise. | |
33 | */ | |
34 | static int tomoyo_audit_env_log(struct tomoyo_request_info *r) | |
35 | { | |
36 | return tomoyo_supervisor(r, "misc env %s\n", | |
37 | r->param.environ.name->name); | |
38 | } | |
39 | ||
40 | /** | |
41 | * tomoyo_env_perm - Check permission for environment variable's name. | |
42 | * | |
43 | * @r: Pointer to "struct tomoyo_request_info". | |
44 | * @env: The name of environment variable. | |
45 | * | |
46 | * Returns 0 on success, negative value otherwise. | |
47 | * | |
48 | * Caller holds tomoyo_read_lock(). | |
49 | */ | |
50 | int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env) | |
51 | { | |
52 | struct tomoyo_path_info environ; | |
53 | int error; | |
54 | ||
55 | if (!env || !*env) | |
56 | return 0; | |
57 | environ.name = env; | |
58 | tomoyo_fill_path_info(&environ); | |
59 | r->param_type = TOMOYO_TYPE_ENV_ACL; | |
60 | r->param.environ.name = &environ; | |
61 | do { | |
62 | tomoyo_check_acl(r, tomoyo_check_env_acl); | |
63 | error = tomoyo_audit_env_log(r); | |
64 | } while (error == TOMOYO_RETRY_REQUEST); | |
65 | return error; | |
66 | } | |
67 | ||
68 | /** | |
69 | * tomoyo_same_env_acl - Check for duplicated "struct tomoyo_env_acl" entry. | |
70 | * | |
71 | * @a: Pointer to "struct tomoyo_acl_info". | |
72 | * @b: Pointer to "struct tomoyo_acl_info". | |
73 | * | |
74 | * Returns true if @a == @b, false otherwise. | |
75 | */ | |
76 | static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a, | |
77 | const struct tomoyo_acl_info *b) | |
78 | { | |
79 | const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head); | |
80 | const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head); | |
81 | ||
82 | return p1->env == p2->env; | |
83 | } | |
84 | ||
85 | /** | |
86 | * tomoyo_write_env - Write "struct tomoyo_env_acl" list. | |
87 | * | |
88 | * @param: Pointer to "struct tomoyo_acl_param". | |
89 | * | |
90 | * Returns 0 on success, negative value otherwise. | |
91 | * | |
92 | * Caller holds tomoyo_read_lock(). | |
93 | */ | |
94 | static int tomoyo_write_env(struct tomoyo_acl_param *param) | |
95 | { | |
96 | struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL }; | |
97 | int error = -ENOMEM; | |
98 | const char *data = tomoyo_read_token(param); | |
99 | ||
100 | if (!tomoyo_correct_word(data) || strchr(data, '=')) | |
101 | return -EINVAL; | |
102 | e.env = tomoyo_get_name(data); | |
103 | if (!e.env) | |
104 | return error; | |
105 | error = tomoyo_update_domain(&e.head, sizeof(e), param, | |
106 | tomoyo_same_env_acl, NULL); | |
107 | tomoyo_put_name(e.env); | |
108 | return error; | |
109 | } | |
110 | ||
111 | /** | |
112 | * tomoyo_write_misc - Update environment variable list. | |
113 | * | |
114 | * @param: Pointer to "struct tomoyo_acl_param". | |
115 | * | |
116 | * Returns 0 on success, negative value otherwise. | |
117 | */ | |
118 | int tomoyo_write_misc(struct tomoyo_acl_param *param) | |
119 | { | |
120 | if (tomoyo_str_starts(¶m->data, "env ")) | |
121 | return tomoyo_write_env(param); | |
122 | return -EINVAL; | |
123 | } |