mirror of
https://github.com/troglobit/finit.git
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Joachim Nilsson
ded4b3926e
This patch adds support for custom port and interface filtering to inetd
services, in a very condensed syntax:
inetd ssh@eth0:222/tcp nowait [2345] /usr/sbin/sshd -i
inetd ssh@eth1:22/tcp nowait [2345] /usr/sbin/sshd -i
In this example eth0 and eth1 are allowed inbound interfaces for SSH
connections, on port 222 and 22, respectively. Attempting to connect
from any other interface is denied. Also, if the system is not in
runlevel 2, 3, 4, or 5, ports 222 and 22 will not even be opened.
If eth0 is your upstream interface you may want to avoid using the
default port. To run ssh on port 222, and all others on port 22:
inetd ssh@eth0:222/tcp nowait [2345] /usr/sbin/sshd -i
inetd ssh/tcp nowait [2345] /usr/sbin/sshd -i
This actually adds a deny rule for eth0 on ssh/tcp, implicitly. You can
even list the services in the reverse order with the same result:
inetd ssh/tcp nowait [2345] /usr/sbin/sshd -i
inetd ssh@eth0:222/tcp nowait [2345] /usr/sbin/sshd -i
There is no specific deny syntax available yet, see the TODO file for
more details on how this can be implemented.
Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/* Classic inetd services launcher for Finit
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*
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* Copyright (c) 2015 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef FINIT_INETD_H_
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#define FINIT_INETD_H_
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#include <netdb.h>
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#include <net/if.h>
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#include "queue.h"
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#include "libuev/uev.h"
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typedef struct inetd_filter {
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LIST_ENTRY(inetd_filter) link;
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int deny; /* 0:allow, 1:deny */
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char ifname[IFNAMSIZ]; /* E.g., eth0 */
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} inetd_filter_t;
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typedef struct {
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uev_t watcher;
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int type; /* Socket type: SOCK_STREAM/SOCK_DGRAM */
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int std; /* Standard proto/port from /etc/services */
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int proto;
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int port;
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int forking;
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char name[10];
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int (*cmd)(int type); /* internal inetd service, like 'time' */
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LIST_HEAD(, inetd_filter) filters;
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} inetd_t;
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int inetd_dgram_peek (int sd, char *ifname);
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int inetd_stream_peek (int sd, char *ifname);
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int inetd_respawn (pid_t pid);
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void inetd_runlevel(uev_ctx_t *ctx, int runlevel);
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int inetd_match (inetd_t *inetd, char *service, char *proto, char *port);
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int inetd_add (inetd_t *inetd, char *service, char *proto, char *ifname, char *port, int forking);
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inetd_filter_t *inetd_filter_find (inetd_t *inetd, char *ifname);
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int inetd_allow_iface (inetd_t *inetd, char *ifname);
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int inetd_is_iface_allowed (inetd_t *inetd, char *ifname);
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#endif /* FINIT_INETD_H_ */
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/**
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* Local Variables:
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* version-control: t
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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