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123 lines
3.1 KiB
123 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* security/tomoyo/environ.c |
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* |
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* Copyright (C) 2005-2011 NTT DATA CORPORATION |
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*/ |
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#include "common.h" |
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/** |
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* tomoyo_check_env_acl - Check permission for environment variable's name. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @ptr: Pointer to "struct tomoyo_acl_info". |
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* |
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* Returns true if granted, false otherwise. |
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*/ |
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static bool tomoyo_check_env_acl(struct tomoyo_request_info *r, |
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const struct tomoyo_acl_info *ptr) |
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{ |
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const struct tomoyo_env_acl *acl = |
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container_of(ptr, typeof(*acl), head); |
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return tomoyo_path_matches_pattern(r->param.environ.name, acl->env); |
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} |
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/** |
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* tomoyo_audit_env_log - Audit environment variable name log. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int tomoyo_audit_env_log(struct tomoyo_request_info *r) |
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{ |
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return tomoyo_supervisor(r, "misc env %s\n", |
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r->param.environ.name->name); |
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} |
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/** |
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* tomoyo_env_perm - Check permission for environment variable's name. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @env: The name of environment variable. |
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* |
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* Returns 0 on success, negative value otherwise. |
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* |
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* Caller holds tomoyo_read_lock(). |
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*/ |
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int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env) |
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{ |
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struct tomoyo_path_info environ; |
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int error; |
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if (!env || !*env) |
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return 0; |
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environ.name = env; |
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tomoyo_fill_path_info(&environ); |
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r->param_type = TOMOYO_TYPE_ENV_ACL; |
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r->param.environ.name = &environ; |
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do { |
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tomoyo_check_acl(r, tomoyo_check_env_acl); |
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error = tomoyo_audit_env_log(r); |
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} while (error == TOMOYO_RETRY_REQUEST); |
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return error; |
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} |
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/** |
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* tomoyo_same_env_acl - Check for duplicated "struct tomoyo_env_acl" entry. |
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* |
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* @a: Pointer to "struct tomoyo_acl_info". |
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* @b: Pointer to "struct tomoyo_acl_info". |
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* |
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* Returns true if @a == @b, false otherwise. |
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*/ |
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static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a, |
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const struct tomoyo_acl_info *b) |
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{ |
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const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head); |
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const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head); |
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return p1->env == p2->env; |
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} |
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/** |
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* tomoyo_write_env - Write "struct tomoyo_env_acl" list. |
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* |
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* @param: Pointer to "struct tomoyo_acl_param". |
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* |
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* Returns 0 on success, negative value otherwise. |
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* |
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* Caller holds tomoyo_read_lock(). |
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*/ |
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static int tomoyo_write_env(struct tomoyo_acl_param *param) |
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{ |
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struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL }; |
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int error = -ENOMEM; |
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const char *data = tomoyo_read_token(param); |
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if (!tomoyo_correct_word(data) || strchr(data, '=')) |
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return -EINVAL; |
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e.env = tomoyo_get_name(data); |
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if (!e.env) |
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return error; |
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error = tomoyo_update_domain(&e.head, sizeof(e), param, |
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tomoyo_same_env_acl, NULL); |
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tomoyo_put_name(e.env); |
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return error; |
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} |
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/** |
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* tomoyo_write_misc - Update environment variable list. |
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* |
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* @param: Pointer to "struct tomoyo_acl_param". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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int tomoyo_write_misc(struct tomoyo_acl_param *param) |
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{ |
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if (tomoyo_str_starts(¶m->data, "env ")) |
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return tomoyo_write_env(param); |
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return -EINVAL; |
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}
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