FORMAT

A line that starts with '#' is a comment. Any other line is a configuration statement. Configuration statements may be extended to cover multiple lines with a '\' character at the end of a line.

OVERVIEW

In previous versions of Portslave there are two main types of configuration directives, global directives that start with 'conf.' and line directives starting with 'all.' or 'sXX.' The configuration directives were divided (somewhat arbitarily) into global directives that apply to all lines and line directives that may have different values for each line. This distinction makes no sense to me, so I have removed it. Now all directives can have different values for each line! This gives this version of Portslave many new configuration options that were previously absent.

If a line starts with 'conf.' or 'all.' then it's value is a default value for all lines. If a line starts with 'sXX.' then it's value applies to the specified line (where 'XX' specifies the number of the 'NAS port' - a non-negative number). This number is the command-line parameter used on the portslave command line.

DATA TYPES

Configuration directives are all comprised of a name followed by a value. The value may be of type int, dynamic int, bool, string, enum, hostname, hostname service, IP number, IP number service, dynamic IP number, and chat-script.

int

A simple number.

dynamic int

Number which may end in a '+' character to specify that the it is to have the port number added to it.

bool

A boolean value, 0/no/false or 1/yes/true.

string

A string may comprise multiple lines, non-terminal lines must end with a '\' character. Strings do not need quotes around them (double quotes around strings are accepted but ignored, useful if you want leading or trailing white-space I guess). The null string representation is "". All the usual string escape sequences are supported, \n for a new line, \r for carriage return, ^D or ^d means the controll-D sequence (character ASCII 4 EOT).

enum

One of several string values that are internally translated to a number.

hostname

Hostnames are resolved to IP addresses immediately upon startup! You must have your name server running before Portslave is started!

hostname service

hostname and IP service (either a number or a name to be resolved from /etc/services). The IP service is optional, if it is specified then the IP address must be enclosed in "[" and "]".

IP number

Simple dotted-quad IP address.

dynamic IP number

Dotted-quad IP address which may end in a '+' character to specify that the IP address is to have the port number added to it.

EXPANSION

Lines may be expanded in the following fashion:

s{32-63}.tty tts/C{0-31}

This means the same as the following:

s32.tty tts/C0 s33.tty tts/C1 ... s63.tty tts/C31

ATTRIBUTES

logpassword

bool - whether to write users' passwords to syslog (default no).

chat-script

A chat script is at it's simplest a series of expect send pairs. The system will expect a string and then send another string in response if/when it receives the expect string. An expect-string may be of the form A-B-C in which case if the sub-string A is not found due to timeout then the sub-string B will be sent and then the sub-string C will be expected. NB There must be exactly three parts to an expect-string that has sub-strings and they are to be delimited by "-" characters. Also note that to wait for a "-" you must escape it as "\-".

The send string may have the following special escape sequences. "\d" for a one second delay, "\p" for a 100ms pause, "\l" to lower DTR for one second, "\c" to specify that the string is not to end with a "\r" character, and "\K" to send a break character.

Also special strings may be inserted before the expect strings in any part of the chat script. The special strings are as follows:

TIMEOUT XX to specify that the new timeout when waiting for an expect string is to be XX seconds.

WAIT DCD to wait for the DCD line of the modem to be asserted.

STATUS USER-NAME HOST-NAME writes an entry to the /var/run/utmp file with the user name field set to the first parameter (portslave uses "Incoming" and "Connected" as the default values for the first two phases of connecting). It also uses "%p:I.HANDSHAKE" as the default for the hostname. See ctlportslave for the use of this.

ABORT XX to abort the connection if the string XX (which may contain multiple words surrounded by quotes) is received.

SETVAR Z=XX to set the variable specified by the character Z to the text following the string XX (quote the entire Z=XX part if the string XX contains a space). The variable Z may be 'C' for the connect string, 'S' for the source of the call (from caller line identification), or 'D' for the number dialled (from CLI). Here is an example to recognise the connect strings from common configurations of Hayes compatible modems:

SETVAR "C=CARRIER " SETVAR C+PROTOCOL: SETVAR C?CONNECT

The first line does an unconditional assignment when the string "CARRIER " is found, the second appends data to the variable when the string "PROTOCOL" is found, and the third will do an assignment when the string "CONNECT" is found if the variable is empty.

Note that in the variable assignment white-space preceeding the value is removed.

GLOBAL DIRECTIVES

hostname

String - Hostname of the current system. Defaults to the hostname returned by gethostname().

loc_host

IP number - address for local end of SLIP and PPP connections, defaults to a DNS lookup of the value from hostname.

lockdir

String - Lock directory, defaults to /var/lock which is the directory for FSSTD compliant systems. If set to an empty string then it will turn off locking.

rlogin

String - Where to find the rlogin binary that accepts the -i flag for specifying the local user-name.

Defaults to the location where we install rlogin-radius.

telnet

String - Where to find telnet. This can just be the system telnet.

Defaults to where telnet is detected on the local system.

ssh

String - Where to find ssh. This can just be the system SSH.

Defaults to where ssh is detected on the local system.

pppd

String - Where to find our patched pppd that supports the libpsr.so library.

Defaults to the location where we install pppd-radius.

locallogins

bool - If you set this to true, you can login locally by putting a '!' before your loginname. Useful for emergencies when the RADIUS server is down. Setting this is a potential security risk!

allow_chap

bool - Set to true if you want CHAP authentication. Turned off by default at the moment because the chap code in pppd doesn't allow setting the IP address.

syslog

hostname - The host to send remote syslog data to. Leave empty for only local logging.

facility

int - The local facility number. A number from 0 to 7 inclusive means syslog facility local0 to local7.

filterdir

string - Directory where your scripts that set up IP filtering (typically using ipchains or iptables) are stored. To invoke them, just add the RADIUS-attribute Framed-Filter-Id = "foo" to your profile, where foo is the name of script. Then the script will be run as: script <start:stop> <remote ip> <local ip> <remote netmask>

stripnames

bool - whether to remove a preceeding 'P', 'C', 'S', '!', or 'L' or a trailing '.slip', '.cslip', or '.ppp' before storing the user-name in the utmp.

tty

string - this is the only line directive that can't be used as an 'all.' or path or relative to /dev) that is used for the device. If you want devices /dev/tts/0 and /dev/ttr/5 to be NAS ports 1 and 2 respectively and have them use the default line settings (from the 'all' values) then you can use the following lines:

s1.tty tts/0 s2.tty ttr/5

debug

int - 0 means no debug output, 1 means some, 2 means all. 2 means lots of data!

sysutmp

bool - if true then log to utmp like a regular getty/login. Do not set this to false unless you really know what you are doing, it breaks ctlportslave (amoung other things).

syswtmp

bool - if true then log to wtmp like a regular getty/login (NB we will never log to wtmp if utmp logging is off).

utmpfrom

string - format of the utmp/wtmp FROM field. See the expansion directives section. The default value is "%p:%P.%3.%4", for ctlportslave to work properly the start of the string must be "%p:".

emumodem

bool - emulate a modem. This is for when Portslave is directly connected to a machine that thinks it is connected to a modem. Portslave will emulate a Hayes compatible modem.

porttype

enum - 'async', 'sync', 'isdn', 'isdn-v120', or 'isdn-v110'. If you don't understand this then you probably want 'async'.

authtype

enum - 'none', 'radius', 'tacacs', 'remote', 'local', 'radius/local', 'tacacs/local', 'local/radius', or 'local/tacacs' for which type of authentication to use. 'none' means that we just use the supplied user-name for logging purposes and don't talk to the RADIUS server on login.

radclient_config_file

string - file name for configuration file for radclient

radnullpass

bool - true means to accept RADIUS logins with a null password, false means to reject them. Default true.

tacauthhost1 tacauthhost2

hostname - host names for the TACACS Authentication host if Portslave is compiled with TACACS support.

protocol

enum - 'login', 'rlogin', 'telnet', 'ssh1', 'ssh', 'slip', 'cslip', 'ppp', 'ppp_only', 'tcpclear', 'tcplogin', 'console', 'socket_client', 'socket_server', or 'socket_ssh'.
 Login is to exec /bin/login.  Rlogin, telnet, and ssh are for executing those programs to login to other machines. Slip, cslip, and PPP are for running those IP connectivity protocols, ppp_only is for leased line configuration. Tcplogin and console are apparently not implemented, with tcpclear I have not been able to work out what it does. Contributions welcome! Default ppp.

host

hostname - default host for rlogin/telnet/ssh sessions.

rem_host

dynamic IP number - used as the client IP address if the RADIUS server doesn't send an IP address, or when it tells us to use a dynamic address.

netmask

IP number - in almost all cases it should be 255.255.255.255, leave it at that unless you really know what you are doing.

mtu

int - MTU for connection, 1500 is a good value as that's what Ethernet uses and most packets get routed over Ethernet in some way so 1500 avoids fragmentation and reduces the number of packets needed to transfer data.

mru

int - MRU for connection, generally should be the same as the MTU.

autoppp

string - PPP command-line options to be used when we autodetect a PPP session. Note that the expansion directives apply.

pppopt

string - PPP command-line options to be used when we have already authenticated the user and the service type is known to be PPP. Same format as autoppp.

issue

string - message that is issued on connect. Expansion directives are applied.

prompt

string - login prompt, default is "%h login: ". Expansion directives are applied.

term

string - terminal type for rlogin/telnet/ssh sessions. Defaults to vt100.

speed

int - port speed in bps.

socket_port

dynamic int - port number used for telnet targets.

parity

enum - 'none', 'odd', or 'even'.

stopbits

int - number of stop bits.

datasize

int - size of a character 5, 6, 7, or 8 bits.

dcd

bool - use the DCD line or not (this sets CLOCAL if off). This means that the session will get hung up if the modem hangs up.

flow

enum - 'none', 'hard', or 'soft'. Hardware (RTS/CTS), software (XON/XOFF AKA ^S/^Q), or no flow control.

initchat

chat-script - the chat script for initialising the modem and answering. Needs much more documentation on this.

radclient_config_file

string - configuration file for radclient (default /etc/portslave/radclient.conf).

login_time

string - the times that are allowed for logins.

login_time_limited

bool - if true then the maximum length of the call will be determined by the value of the login_time setting.

EXPANSION DIRECTIVES

These directives can be used for the format of the utmp/wtmp field, for the autoppp, pppopt, issue, prompt fields, and others.

%l

login name

%L

stripped login name

%p

NAS port number

%P

protocol

%b

port speed

%H

host for telnet/ssh connections

%i

local IP

%j

remote IP

%1

first byte (MSB) of remote IP

%2

second byte of remote IP

%3

third byte of remote IP

%4

fourth byte (LSB) of remote IP

%c

connect-info

%m

netmask

%M

multilink if the RADIUS server has PW_NAS_PORT_LIMIT set to > 1, otherwise empty string

%t

MTU

%r

MRU

%I

idle timeout

%T

session timeout

%h

hostname

%d

dcd setting, expands to "modem" if DCD line is to be used or to "local" if it isn't. Put this on the ppp command line to give it the right setting to match the value of the "dcd" attribute.

%%

%

AUTHOR

This man page was written by Russell Coker <[email protected]>. May be freely used and distributed without restriction.