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Add support for a deny filter syntax to inetd services

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This patch changes the syntax for custom inetd services and adds support
for deny filters.  The new syntax is:

    inetd service/proto[@iface,!iface,...] </path/to/cmd | internal[.service]>

This means the second column now defines what@from and the third to/what
process.  For internal services on a custom port the internal.service
syntax must be specified, so Finit can properly bind the inetd service
to the correct plugin.  Here follows a few examples:

    inetd time/udp                    wait [2345] internal                -- UNIX rdate service
    inetd time/tcp                  nowait [2345] internal                -- UNIX rdate service
    inetd 3737/tcp                  nowait [2345] internal.time           -- UNIX rdate service
    inetd telnet/tcp@*,!eth1,!eth0, nowait [2345] /sbin/telnetd -i -F     -- Telnet service
    inetd 2323/tcp@eth1,eth2,eth0   nowait [2345] /sbin/telnetd -i -F     -- Telnet service
    inetd 222/tcp@eth0              nowait [2345] /sbin/dropbear -i -R -F -- SSH service
    inetd ssh/tcp@*,!eth0           nowait [2345] /sbin/dropbear -i -R -F -- SSH service

Access to telnet on port `2323` is only possible from interfaces `eth0`,
`eth1` and `eth2`.  The standard telnet port (`23`) is available from
all other interfaces, but also `eth2`.  The `*` notation used in the ssh
stanza means *any* interface, however, here `eth0` is not allowed.

NOTE: This patch breaks syntax compatibility with Finit v1.12!

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson committed 2015-06-15 14:15:39 +02:00
1 parent b0c759e518
commit 03573b41ca
7 files changed
+177 -195
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TODO.md
-11
View File
@@ -59,17 +59,6 @@ to achieve compatibility would be to add a plugin to finit which reads
Inetd
-----
wkz says we need deny rules and better syntax! we agrees
wkz --> inetd telnet/tcp @!eth0
wkz --> inetd 2323/tcp @eth0
wkz --> 77/udp wait [2345] @finit/time
jnn --> telnet@eth0,eth1/tcp
jnn --> 2323@eth2/tcp
jnn --> 3000/udp wait [2345] time/internal
Optimize interface filtering by using socket filter. The functions
`inet_*_peek()` and `inetd_is_allowed()` used for interace filtering
should be possible to rewrite as socket filters.