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gtlssh(1) General Commands Manual gtlssh(1) NAME gtlssh - Shell connection over TLS SYNOPSIS gtlssh [options] <host> [<program>] DESCRIPTION The gtlssh program connects to a remote server, authenticates the re- mote server using SSL, then authenticates itself with the server. gtlsshd will attempt an SCTP connection first, and fall back to TCP if that doesn't work. WINDOWS HACKS See "WINDOWS HACKS" in the gtlssh-keygen.1 man page for information about special windows configuration. OPTIONS -p|--port port Use the given port instead of the default port. -i|--keyfile file Use the given file for the key instead of the default. If you specify this, the certfile will be the same name ending in .crt, unless you specify it explicitly. --certfile file Set the certificate to use. --cadir directory Set the directory that holds the certificate authority used to authenticate the server. -e|--escchar char Specify a character to use for the escape character. Setting it to -1 disables the escape character. This can either be a deci- mal or hexadeximal number or ^x to set a control character. By default it is ^\ if io1 is the default and stdin is a tty, or disabled otherwise. See ESCAPES below for more details on the escape character. Only handled on io1. -r|--telnet Do telnet processing with RFC2217 handling. --nosctp Disable SCTP support. It is disabled by default. --sctp Enable SCTP support. --notcp Disable TCP support --transport <connecter> Instead of using SCTP or TCP, use the given gensio connecter for transport. In this case, the host is required but the hostname part is ignored. This is so the username can be set, if re- quired. --mdns Look up the name using mDNS. This will fetch then IP address, IPv4 or IPv6, the port number and whether telnet is required and make the connection --mdns-type Set the type used for the lookup. See the gmdns(1) man page un- der 'STRING VALUES FOR QUERIES' for detail on how to do regex, glob, etc. --nomux Don't use a mux gensio. This may cause issues with gtlsshd, but is useful in some cases for talking with ser2net with no mux support. --privileged When logging onto a Windows server, don't drop privileges on a privileged account. Normally you are logged in and run as a normal user (with a privileged linked token), this will allow you just run privileged. Requires --allow-root on the server. -L <accept addr>:<connect addr> Listen at the <accept addr> on the local machine, and if a connection comes in forward it to the <connect addr> from the remote machine on the gtlssh connec- tion. A local address is in the form [<bind addr>:][sctp|tcp,]port or <unix socket path>. Remote addresses are in the form <hostname>:[sctp|tcp,]port or <unix socket path>. If a name begins with '/' it is a unix socket path. <hostname> and <bindaddr> are standard internet names or ad- dresses. -R <accept addr>:<connect addr> Like -L, except the <accept addr> is on the remote machine and <connect addr> is done from the local machine. -4 Do IPv4 only. -6 Do IPv6 only. -d|--debug Generate debugging output. Specifying more than once increases the output. --version Print the version number and exit. -h|--help Help output HOST AUTHENTICATION After connecting, the host is first validated using standard SSL. The keys used for validation are in $HOME/.gtlssh/server_certs by default. If the given key is not recognized, the user is prompted with the cer- tificate fingerprint asking if the user wants to accept the certifi- cate. If the user accepts the certificate, then it is added into the default directory. If not, the connection is terminated. Certificates are stored in the form "<hostname>,<port>.crt" and "<ipad- dress>,<port>.crt". Both are created for a connection (unless connect- ing with an IP address). A connection is verified as matching both en- tries, if the certificate in the file does not match the certificate from the remote end, the connection is terminated and the user in- formed. USER AUTHENTICATION If host authentication succeeds, gtlssh authenticates itself with a key and certificate. These files are fetch by default from $HOME/.gtlssh/keycerts in the form <host>[,<port>].key and <host>[,<port>].crt. If the form with the host and port exists, that is taken. Otherwise if the form with just the host exists, it is taken. Otherwise it defaults to $HOME/.gtlssh/default.key and $HOME/.gttlssh/default.crt. The remote end looks in $HOME/.gtlssh/allowed_certs for the certifi- cate. If the remote end does not have the certificate presented, then password authentication is tried. ITERACTIVE MODE If the stdin for gtlssh is a tty and no program is given to run, then the login is an interactive login. Any sort of delay in I/O processing is disabled, and the local terminal is used for I/O and it is put into raw mode In non-interactive mode, the local side uses stdio for local I/O and I/O processing delay on the network side is not disabled. This is use- ful for programs transferring data over the connection. ESCAPES If the escape character is received from the user, the character is not transferred and the program waits for another character. If the other character is also the escape character, a single escape character is sent. If the other character is not recognized as a valid escape, it is ignore and not transferred. Upper and lower case are equivalent. Escape characters are: q Quit the program. b Send a break to io2. Ignored if io2 does not support break. d Dump serial data for io2. Ignored if io2 is not a RFC2217 capa- ble. s Set the serial port (baud) rate for io2. Ignored if io2 is not RFC2177 capable. After this, the serial port speed must be typed, terminated by a new line. Invalid speeds are ignore, use escchar-d to know if you set it right. n, o, e Set the parity on io2 to none, odd, or even. Ignored if io2 is not RFC2217 capable. 7, 8 Set the data size on io2 to 7 or 8 bits. Ignored if io2 is not RFC2217 capable. 1, 2 Set the number of stop bits to 1 or 2 on io2 bits. Ignored if io2 is not RFC2217 capable. SEE ALSO gensio(5), gtlsshd(1), gtlssh-keygen(1), gmdns(1) KNOWN PROBLEMS None. AUTHOR Corey Minyard <minyard@acm.org> Shell connection over TLS 01/02/19 gtlssh(1)
NAME | SYNOPSIS | DESCRIPTION | WINDOWS HACKS | OPTIONS | HOST AUTHENTICATION | USER AUTHENTICATION | ITERACTIVE MODE | ESCAPES | SEE ALSO | KNOWN PROBLEMS | AUTHOR
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