08-27-2019
See updated post to fix quotes.
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LEARN ABOUT SUSE
tcprules
tcprules(1) General Commands Manual tcprules(1)
NAME
tcprules - compile rules for tcpserver
SYNOPSIS
tcprules rules.cdb rules.tmp
OVERVIEW
tcpserver optionally follows rules to decide whether a TCP connection is acceptable. For example, a rule of
18.23.0.32:deny
prohibits connections from IP address 18.23.0.32.
tcprules reads rules from its standard input and writes them into rules.cdb in a binary format suited for quick access by tcpserver.
tcprules can be used while tcpserver is running: it ensures that rules.cdb is updated atomically. It does this by first writing the rules
to rules.tmp and then moving rules.tmp on top of rules.cdb. If rules.tmp already exists, it is destroyed. The directories containing
rules.cdb and rules.tmp must be writable to tcprules; they must also be on the same filesystem.
If there is a problem with the input, tcprules complains and leaves rules.cdb alone.
The binary rules.cdb format is portable across machines.
RULE FORMAT
A rule takes up one line. A file containing rules may also contain comments: lines beginning with # are ignored.
Each rule contains an address, a colon, and a list of instructions, with no extra spaces. When tcpserver receives a connection from that
address, it follows the instructions.
ADDRESSES
tcpserver starts by looking for a rule with address TCPREMOTEINFO@TCPREMOTEIP. If it doesn't find one, or if TCPREMOTEINFO is not set, it
tries the address TCPREMOTEIP. If that doesn't work, it tries shorter and shorter prefixes of TCPREMOTEIP ending with a dot. If none of
them work, it tries the empty string.
For example, here are some rules:
joe@127.0.0.1:first
18.23.0.32:second
127.:third
:fourth
::1:fifth
If TCPREMOTEIP is 10.119.75.38, tcpserver will follow the fourth instructions.
If TCPREMOTEIP is ::1, tcpserver will follow the fifth instructions. Note that you cannot detect IPv4 mapped addresses by matching
"::ffff", as those addresses will be converted to IPv4 before looking at the rules.
If TCPREMOTEIP is 18.23.0.32, tcpserver will follow the second instructions.
If TCPREMOTEINFO is bill and TCPREMOTEIP is 127.0.0.1, tcpserver will follow the third instructions.
If TCPREMOTEINFO is joe and TCPREMOTEIP is 127.0.0.1, tcpserver will follow the first instructions.
ADDRESS RANGES
tcprules treats 1.2.3.37-53:ins as an abbreviation for the rules 1.2.3.37:ins, 1.2.3.38:ins, and so on up through 1.2.3.53:ins. Similarly,
10.2-3.:ins is an abbreviation for 10.2.:ins and 10.3.:ins.
INSTRUCTIONS
The instructions in a rule must begin with either allow or deny. deny tells tcpserver to drop the connection without running anything.
For example, the rule
:deny
tells tcpserver to drop all connections that aren't handled by more specific rules.
The instructions may continue with some environment variables, in the format ,VAR="VALUE". tcpserver adds VAR=VALUE to the current envi-
ronment. For example,
10.0.:allow,RELAYCLIENT="@fix.me"
adds RELAYCLIENT=@fix.me to the environment. The quotes here may be replaced by any repeated character:
10.0.:allow,RELAYCLIENT=/@fix.me/
Any number of variables may be listed:
127.0.0.1:allow,RELAYCLIENT="",TCPLOCALHOST="movie.edu"
SEE ALSO
tcprulescheck(1), tcpserver(1), tcp-environ(5)
tcprules(1)