Jake Freeland
2567168dc4
When a SIGHUP signal is sent to syslogd, the configuration is reparsed, leading to new resource acquisition. If syslogd is running in capability mode and a SIGHUP is received, new resources cannot be acquired. To mitigate this issue, libcasper is used to parse the configuration. The libcasper process runs outside of capability mode and is capable of parsing syslogd's configuration and obtaining new resources. These resources are then sent to the syslogd process via nvlist. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D41464
55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2023 The FreeBSD Foundation
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*
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* This software was developed by Jake Freeland <jfree@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <libcasper.h>
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#include <string.h>
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#include <casper/cap_net.h>
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#include "syslogd_cap.h"
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/* This is where libcasper receives commands via nvlist. */
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static int
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casper_command(const char *cmd, const nvlist_t *limits __unused,
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nvlist_t *nvlin, nvlist_t *nvlout)
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{
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int error = EINVAL;
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if (strcmp(cmd, "readconfigfile") == 0)
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error = casper_readconfigfile(nvlin, nvlout);
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return (error);
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}
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CREATE_SERVICE("syslogd.casper", NULL, casper_command, CASPER_SERVICE_STDIO);
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