environ.c

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/*
 * security/tomoyo/environ.c
 *
 * Copyright (C) 2005-2011  NTT DATA CORPORATION
 */

#include "common.h"

static bool tomoyo_check_env_acl(struct tomoyo_request_info *r,
                 const struct tomoyo_acl_info *ptr)
{
    const struct tomoyo_env_acl *acl =
        container_of(ptr, typeof(*acl), head);

    return tomoyo_path_matches_pattern(r->param.environ.name, acl->env);
}

static int tomoyo_audit_env_log(struct tomoyo_request_info *r)
{
    return tomoyo_supervisor(r, "misc env %s\n",
                 r->param.environ.name->name);
}

int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env)
{
    struct tomoyo_path_info environ;
    int error;

    if (!env || !*env)
        return 0;
    environ.name = env;
    tomoyo_fill_path_info(&environ);
    r->param_type = TOMOYO_TYPE_ENV_ACL;
    r->param.environ.name = &environ;
    do {
        tomoyo_check_acl(r, tomoyo_check_env_acl);
        error = tomoyo_audit_env_log(r);
    } while (error == TOMOYO_RETRY_REQUEST);
    return error;
}

static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a,
                const struct tomoyo_acl_info *b)
{
    const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head);
    const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head);

    return p1->env == p2->env;
}

static int tomoyo_write_env(struct tomoyo_acl_param *param)
{
    struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL };
    int error = -ENOMEM;
    const char *data = tomoyo_read_token(param);

    if (!tomoyo_correct_word(data) || strchr(data, '='))
        return -EINVAL;
    e.env = tomoyo_get_name(data);
    if (!e.env)
        return error;
    error = tomoyo_update_domain(&e.head, sizeof(e), param,
                  tomoyo_same_env_acl, NULL);
    tomoyo_put_name(e.env);
    return error;
}

int tomoyo_write_misc(struct tomoyo_acl_param *param)
{
    if (tomoyo_str_starts(&param->data, "env "))
        return tomoyo_write_env(param);
    return -EINVAL;
}