libreoffice-online/common/security.h

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
/*
 * Place for simple security-related code.
 */

#pragma once

#include <sys/capability.h>
#include <sys/types.h>

#include <pwd.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>

#define LOOL_USER_ID "lool"

#ifndef KIT_IN_PROCESS
static int hasCorrectUID(const char *appName)
{
#if ENABLE_DEBUG
    (void)appName;
    return 1; // insecure but easy to use.
#else
    struct passwd *pw = getpwuid(getuid());
    if (pw && pw->pw_name && !strcmp(pw->pw_name, LOOL_USER_ID))
        return 1;
    else {
        fprintf(stderr, "Error: %s incorrect user-name: %s - aborting\n",
                appName, pw && pw->pw_name ? pw->pw_name : "<null>");
        return 0;
    }
#endif
}

/** Return 0 if no capability is set on the current binary. Positive number gives the bitfield of caps that are set, negative an error. */
int hasAnyCapability()
{
    cap_t caps = cap_get_proc();
    if (caps == nullptr)
    {
        fprintf(stderr, "Error: cap_get_proc() failed.\n");
        return -1;
    }

    cap_t caps_none = cap_init();
    if (caps == nullptr)
    {
        fprintf(stderr, "Error: cap_init() failed.\n");
        cap_free(caps);
        return -1;
    }

    // 0 = caps of this process equal to no caps
    int result = cap_compare(caps, caps_none);

    cap_free(caps_none);
    cap_free(caps);

    return result;
}
#endif

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